Incomplete instance based config

This might cause issues with the Replay mod, but we'll see

api/src/main/java/com/seibel/distanthorizons/api/DhApi.java

@@ -180,7 +180,7 @@ public class DhApi
 	 * This version should be updated whenever non-breaking fixes are added to the Distant Horizons API. 
 	 * @since API 1.0.0 
 	 */
-	public static int getApiPatchVersion() { return ModInfo.API_PATH_VERSION; }
+	public static int getApiPatchVersion() { return ModInfo.API_PATCH_VERSION; }
 	
 	/**
 	 * Returns the mod's semantic version number in the format: Major.Minor.Patch

api/src/main/java/com/seibel/distanthorizons/api/interfaces/world/IDhApiDimensionTypeWrapper.java

@@ -28,8 +28,6 @@ import com.seibel.distanthorizons.api.interfaces.IDhApiUnsafeWrapper;
  */
 public interface IDhApiDimensionTypeWrapper extends IDhApiUnsafeWrapper
 {
-	String getDimensionName();
-	
 	boolean hasCeiling();
 	
 	boolean hasSkyLight();

api/src/main/java/com/seibel/distanthorizons/api/interfaces/world/IDhApiLevelWrapper.java

@@ -35,6 +35,9 @@ public interface IDhApiLevelWrapper extends IDhApiUnsafeWrapper
 {
 	IDhApiDimensionTypeWrapper getDimensionType();
 	
+	/** @since API 4.0.0 */
+	String getDimensionName();
+
 	EDhApiLevelType getLevelType();
 	
 	boolean hasCeiling();

api/src/main/java/com/seibel/distanthorizons/coreapi/ModInfo.java

@@ -26,27 +26,28 @@ package com.seibel.distanthorizons.coreapi;
 public final class ModInfo
 {
 	public static final String ID = "distanthorizons";
-	/** The internal protocol version used for networking */
-	public static final int PROTOCOL_VERSION = 1;
-	/** The protocol version used for multiverse networking */
-	public static final int MULTIVERSE_PLUGIN_PROTOCOL_VERSION = 1;
+	
+	public static final String RESOURCE_NAMESPACE = "distant_horizons";
+	public static final String DEDICATED_SERVER_INITIAL_PATH = "dedicated_server_initial";
+	
+	/** Incremented every time any packets are added, changed or removed, with a few exceptions. */
+	public static final int PROTOCOL_VERSION = 4;
+	public static final String WRAPPER_PACKET_PATH = "message";
+	
 	/** The internal mod name */
 	public static final String NAME = "DistantHorizons";
 	/** Human-readable version of NAME */
 	public static final String READABLE_NAME = "Distant Horizons";
-	public static final String VERSION = "2.2.0-a";
+	public static final String VERSION = "2.3.0-a-dev";
 	/** Returns true if the current build is an unstable developer build, false otherwise. */
 	public static boolean IS_DEV_BUILD = VERSION.toLowerCase().contains("dev");
 	
 	/** This version should only be updated when breaking changes are introduced to the DH API */
-	public static final int API_MAJOR_VERSION = 3;
+	public static final int API_MAJOR_VERSION = 4;
 	/** This version should be updated whenever new methods are added to the DH API */
 	public static final int API_MINOR_VERSION = 0;
 	/** This version should be updated whenever non-breaking fixes are added to the DH API */
-	public static final int API_PATH_VERSION = 0;
-	
-	public static final String NETWORKING_RESOURCE_NAMESPACE = "distant_horizons";
-	public static final String MULTIVERSE_PLUGIN_NAMESPACE = "world_control";
+	public static final int API_PATCH_VERSION = 0;
 	
 	/** All DH owned threads should start with this string to allow for easier debugging and profiling. */
 	public static final String THREAD_NAME_PREFIX = "DH-";

core/src/main/java/com/seibel/distanthorizons/core/Initializer.java

@@ -23,6 +23,7 @@ import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericRenderObjectFactory;
 import com.seibel.distanthorizons.core.sql.DatabaseUpdater;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.core.world.DhApiWorldProxy;
 import com.seibel.distanthorizons.core.api.external.methods.config.DhApiConfig;
@@ -40,6 +41,8 @@ import java.awt.*;
 public class Initializer
 {
 	private static final Logger LOGGER = LogManager.getLogger(ModInfo.NAME + "-" + Initializer.class.getSimpleName());
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
 	
 	public static void init()
 	{
@@ -77,16 +80,18 @@ public class Initializer
 			throw new RuntimeException(e);
 		}
 		
-		
-		// attempt to setup Swing so we can display dialogs (popup windows)
-		System.setProperty("java.awt.headless", "false");
-		if (GraphicsEnvironment.isHeadless())
+		if (MC_CLIENT != null)
 		{
-			LOGGER.warn("Java.awt.headless is false. This means Distant Horizons can't display error and info dialog windows.");
-		}
-		else
-		{
-			LOGGER.info("Java.awt.headless set to true. Distant Horizons can correctly display error and info dialog windows.");
+			// attempt to set up Swing so we can display dialogs (popup windows)
+			System.setProperty("java.awt.headless", "false");
+			if (GraphicsEnvironment.isHeadless())
+			{
+				LOGGER.warn("Java.awt.headless is false. This means Distant Horizons can't display error and info dialog windows.");
+			}
+			else
+			{
+				LOGGER.info("Java.awt.headless set to true. Distant Horizons can correctly display error and info dialog windows.");
+			}
 		}
 		
 		// link Core's config to the API

core/src/main/java/com/seibel/distanthorizons/core/api/external/methods/config/client/DhApiDebuggingConfig.java

@@ -33,19 +33,19 @@ public class DhApiDebuggingConfig implements IDhApiDebuggingConfig
 	
 	
 	
-	public IDhApiConfigValue<EDhApiDebugRendering> debugRendering()
+	@Override public IDhApiConfigValue<EDhApiDebugRendering> debugRendering()
 	{ return new DhApiConfigValue<EDhApiDebugRendering, EDhApiDebugRendering>(Config.Client.Advanced.Debugging.debugRendering); }
 	
-	public IDhApiConfigValue<Boolean> debugKeybindings()
+	@Override public IDhApiConfigValue<Boolean> debugKeybindings()
 	{ return new DhApiConfigValue<Boolean, Boolean>(Config.Client.Advanced.Debugging.enableDebugKeybindings); }
 	
-	public IDhApiConfigValue<Boolean> renderWireframe()
+	@Override public IDhApiConfigValue<Boolean> renderWireframe()
 	{ return new DhApiConfigValue<Boolean, Boolean>(Config.Client.Advanced.Debugging.renderWireframe); }
 	
-	public IDhApiConfigValue<Boolean> lodOnlyMode()
+	@Override public IDhApiConfigValue<Boolean> lodOnlyMode()
 	{ return new DhApiConfigValue<Boolean, Boolean>(Config.Client.Advanced.Debugging.lodOnlyMode); }
 	
-	public IDhApiConfigValue<Boolean> debugWireframeRendering()
+	@Override public IDhApiConfigValue<Boolean> debugWireframeRendering()
 	{ return new DhApiConfigValue<Boolean, Boolean>(Config.Client.Advanced.Debugging.DebugWireframe.enableRendering); }
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/api/external/methods/config/client/DhApiMultiplayerConfig.java

@@ -33,10 +33,10 @@ public class DhApiMultiplayerConfig implements IDhApiMultiplayerConfig
 	
 	
 	
-	public IDhApiConfigValue<EDhApiServerFolderNameMode> folderSavingMode()
+	@Override public IDhApiConfigValue<EDhApiServerFolderNameMode> folderSavingMode()
 	{ return new DhApiConfigValue<EDhApiServerFolderNameMode, EDhApiServerFolderNameMode>(Config.Client.Advanced.Multiplayer.serverFolderNameMode); }
 	
-	public IDhApiConfigValue<Double> multiverseSimilarityRequirement()
+	@Override public IDhApiConfigValue<Double> multiverseSimilarityRequirement()
 	{ return new DhApiConfigValue<Double, Double>(Config.Client.Advanced.Multiplayer.multiverseSimilarityRequiredPercent); }
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ClientApi.java

@@ -24,18 +24,20 @@ import com.seibel.distanthorizons.api.enums.rendering.EDhApiRenderPass;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.*;
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
 import com.seibel.distanthorizons.core.file.structure.ClientOnlySaveStructure;
-import com.seibel.distanthorizons.core.level.IKeyedClientLevelManager;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.DhApiRenderProxy;
+import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.util.objects.Pair;
-import com.seibel.distanthorizons.core.world.*;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiDebugRendering;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiRendererMode;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.IServerKeyedClientLevel;
 import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
 import com.seibel.distanthorizons.core.logging.ConfigBasedSpamLogger;
 import com.seibel.distanthorizons.core.logging.SpamReducedLogger;
@@ -43,21 +45,21 @@ import com.seibel.distanthorizons.core.util.math.Mat4f;
 import com.seibel.distanthorizons.core.render.glObject.GLProxy;
 import com.seibel.distanthorizons.core.render.renderer.TestRenderer;
 import com.seibel.distanthorizons.core.util.RenderUtil;
+import com.seibel.distanthorizons.core.world.AbstractDhWorld;
+import com.seibel.distanthorizons.core.world.DhClientServerWorld;
+import com.seibel.distanthorizons.core.world.DhClientWorld;
+import com.seibel.distanthorizons.core.world.IDhClientWorld;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
-//import io.netty.buffer.ByteBuf;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.NotNull;
 import org.lwjgl.glfw.GLFW;
 
 import java.io.File;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Queue;
+import java.util.*;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;
 
@@ -75,9 +77,7 @@ public class ClientApi
 	public static final ClientApi INSTANCE = new ClientApi();
 	public static final TestRenderer TEST_RENDERER = new TestRenderer();
 	
-	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
-	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
-	private static final IKeyedClientLevelManager KEYED_CLIENT_LEVEL_MANAGER = SingletonInjector.INSTANCE.get(IKeyedClientLevelManager.class);
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
 	public static final long SPAM_LOGGER_FLUSH_NS = TimeUnit.NANOSECONDS.convert(1, TimeUnit.SECONDS);
 	
@@ -90,10 +90,11 @@ public class ClientApi
 	
 	private long lastFlushNanoTime = 0;
 	
-	private boolean isServerCommunicationEnabled = false;
+	private final ClientPluginChannelApi pluginChannelApi = new ClientPluginChannelApi(this::clientLevelLoadEvent, this::clientLevelUnloadEvent);
 	
-	/** set to true if any unexpected responses are received from the server */
-	private boolean serverNetworkingIsMalformed = false;
+	/** Delay loading the first level to give the server some time to respond with level to actually load */
+	private Timer firstLevelLoadTimer;
+	private static final long FIRST_LEVEL_LOAD_DELAY_IN_MS = 1_000;
 	
 	/** Holds any levels that were loaded before the {@link ClientApi#onClientOnlyConnected} was fired. */
 	public final HashSet<IClientLevelWrapper> waitingClientLevels = new HashSet<>();
@@ -127,8 +128,8 @@ public class ClientApi
 	public synchronized void onClientOnlyConnected()
 	{
 		// only continue if the client is connected to a different server
-		boolean connectedToServer = MC.clientConnectedToDedicatedServer();
-		boolean connectedToReplay = MC.connectedToReplay();
+		boolean connectedToServer = MC_CLIENT.clientConnectedToDedicatedServer();
+		boolean connectedToReplay = MC_CLIENT.connectedToReplay();
 		if (connectedToServer || connectedToReplay)
 		{
 			if (connectedToServer)
@@ -141,19 +142,22 @@ public class ClientApi
 				
 				if (Config.Client.Advanced.Logging.showReplayWarningOnStartup.get())
 				{
-					MC.sendChatMessage("\u00A76" + "Distant Horizons: Replay detected." + "\u00A7r"); // gold color
-					MC.sendChatMessage("DH may behave strangely or have missing functionality.");
-					MC.sendChatMessage("In order to use pre-generated LODs, put your DH database(s) in:");
-					MC.sendChatMessage("\u00A77"+".Minecraft" + File.separator + ClientOnlySaveStructure.SERVER_DATA_FOLDER_NAME + File.separator + ClientOnlySaveStructure.REPLAY_SERVER_FOLDER_NAME + File.separator + "DIMENSION_NAME"+"\u00A7r"); // light gray color
-					MC.sendChatMessage("This can be disabled in DH's config under Advanced -> Logging.");
-					MC.sendChatMessage("");
+					MC_CLIENT.sendChatMessage("\u00A76" + "Distant Horizons: Replay detected." + "\u00A7r"); // gold color
+					MC_CLIENT.sendChatMessage("DH may behave strangely or have missing functionality.");
+					MC_CLIENT.sendChatMessage("In order to use pre-generated LODs, put your DH database(s) in:");
+					MC_CLIENT.sendChatMessage("\u00A77"+".Minecraft" + File.separator + ClientOnlySaveStructure.SERVER_DATA_FOLDER_NAME + File.separator + ClientOnlySaveStructure.REPLAY_SERVER_FOLDER_NAME + File.separator + "DIMENSION_NAME"+"\u00A7r"); // light gray color
+					MC_CLIENT.sendChatMessage("This can be disabled in DH's config under Advanced -> Logging.");
+					MC_CLIENT.sendChatMessage("");
 				}
 			}
 			
 			// firing after clientLevelLoadEvent
 			// TODO if level has prepped to load it should fire level load event
-			SharedApi.setDhWorld(new DhClientWorld());
+			DhClientWorld world = new DhClientWorld();
+			SharedApi.setDhWorld(world);
 			
+			this.pluginChannelApi.onJoinServer(world.networkState.getSession());
+			world.networkState.sendConfigMessage();
 			
 			LOGGER.info("Loading [" + this.waitingClientLevels.size() + "] waiting client level wrappers.");
 			for (IClientLevelWrapper level : this.waitingClientLevels)
@@ -168,6 +172,13 @@ public class ClientApi
 	/** Synchronized to prevent a rare issue where multiple disconnect events are triggered on top of each other. */
 	public synchronized void onClientOnlyDisconnected()
 	{
+		// clear the first time timer
+		if (this.firstLevelLoadTimer != null)
+		{
+			this.firstLevelLoadTimer.cancel();
+			this.firstLevelLoadTimer = null;
+		}
+		
 		AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 		if (world != null)
 		{
@@ -177,11 +188,7 @@ public class ClientApi
 			SharedApi.setDhWorld(null);
 		}
 		
-		// clear the previous server's information
-		this.isServerCommunicationEnabled = false;
-		this.serverNetworkingIsMalformed = false;
-		KEYED_CLIENT_LEVEL_MANAGER.setUseOverrideWrapper(false);
-		KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(null);
+		this.pluginChannelApi.reset();
 		
 		// remove any waiting items
 		this.waitingChunkByClientLevelAndPos.clear();
@@ -194,16 +201,16 @@ public class ClientApi
 	// level events //
 	//==============//
 	
-	public void clientLevelUnloadEvent(@Nullable IClientLevelWrapper level)
+	public void clientLevelUnloadEvent(IClientLevelWrapper level)
 	{
 		try
 		{
-			if (level == null)
+			LOGGER.info("Unloading client level [" + level + "]-["+level.getDimensionName()+"].");
+			
+			if (level instanceof IServerKeyedClientLevel)
 			{
-				// can happen on certain multiverse servers
-				return;
+				this.pluginChannelApi.onClientLevelUnload();
 			}
-			LOGGER.info("Unloading client level [" + level + "]-["+level.getDimensionType().getDimensionName()+"].");
 			
 			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 			if (world != null)
@@ -223,30 +230,42 @@ public class ClientApi
 		}
 	}
 	
-	public void clientLevelLoadEvent(@Nullable IClientLevelWrapper level) { this.clientLevelLoadEvent(level, false); }
-	public void multiverseClientLevelLoadEvent(@Nullable IClientLevelWrapper level) { this.clientLevelLoadEvent(level, true); }
-	private void clientLevelLoadEvent(@Nullable IClientLevelWrapper level, boolean isServerCommunication)
+	public void clientLevelLoadEvent(IClientLevelWrapper level)
 	{
+		// wait a moment before loading the level to give the server a chance to handle the client's login request
+		if (MC_CLIENT.clientConnectedToDedicatedServer())
+		{
+			if (this.firstLevelLoadTimer == null)
+			{
+				this.firstLevelLoadTimer = TimerUtil.CreateTimer("FirstLevelLoadTimer");
+				this.firstLevelLoadTimer.schedule(new TimerTask()
+				{
+					@Override
+					public void run() { ClientApi.this.clientLevelLoadEvent(level); }
+				}, FIRST_LEVEL_LOAD_DELAY_IN_MS);
+				return;
+			}
+			this.firstLevelLoadTimer.cancel();
+		}
+		
+		
 		try
 		{
-			if (this.isServerCommunicationEnabled && !isServerCommunication)
-			{
-				LOGGER.info("Server supports communication, deferring loading.");
-				return;
-			}
-			if (level == null)
-			{
-				// can happen on certain multiverse servers
-				return;
-			}
-			
-			
-			
-			LOGGER.info("Loading " + (isServerCommunication ? "Multiverse" : "") + " client level [" + level + "]-["+level.getDimensionType().getDimensionName()+"].");
+			LOGGER.info("Loading client level [" + level + "]-["+level.getDimensionName()+"].");
 			
 			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 			if (world != null)
 			{
+				if (!this.pluginChannelApi.allowLevelLoading(level))
+				{
+					LOGGER.info("Levels in this connection are managed by the server, skipping auto-load.");
+					
+					// Instead of attempting to load themselves, send the config and wait for a server provided level key.
+					((DhClientWorld) world).networkState.sendConfigMessage();
+					return;
+				}
+				
+				
 				world.getOrLoadLevel(level);
 				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(level));
 				
@@ -295,7 +314,7 @@ public class ClientApi
 	{
 		LOGGER.info("Renderer shutting down.");
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-RendererShutdown");
 		
 		profiler.pop();
@@ -305,7 +324,7 @@ public class ClientApi
 	{
 		LOGGER.info("Renderer starting up.");
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-RendererStartup");
 		
 		// make sure the GLProxy is created before the LodBufferBuilder needs it
@@ -315,7 +334,7 @@ public class ClientApi
 	
 	public void clientTickEvent()
 	{
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-ClientTick");
 		
 		try
@@ -337,7 +356,7 @@ public class ClientApi
 				// Ignore local world gen, as it's managed by server ticking
 				if (!(clientWorld instanceof DhClientServerWorld))
 				{
-					SharedApi.worldGenTick(clientWorld::doWorldGen);
+					SharedApi.worldGenTick(clientWorld::worldGenTick);
 				}
 			}
 		}
@@ -355,124 +374,15 @@ public class ClientApi
 	//============//
 	// networking //
 	//============//
-
-//	/** @param byteBuf is Netty's {@link ByteBuffer} wrapper. */
-//	public void serverMessageReceived(ByteBuf byteBuf)
-//	{
-//		if (!Config.Client.Advanced.Multiplayer.enableMultiverseNetworking.get())
-//		{
-//			// multiverse networking disabled, ignore anything sent from the server
-//			return;
-//		}
-//		
-//		
-//		
-//		// either value can be set to true to debug the received byte stream
-//		boolean stopAndDisplayInputAsByteArray = false;
-//		boolean stopAndDisplayInputAsString = false;
-//		if (stopAndDisplayInputAsByteArray || stopAndDisplayInputAsString)
-//		{
-//			String messageString = "";
-//			if (stopAndDisplayInputAsByteArray)
-//			{
-//				int byteCount = byteBuf.readableBytes();
-//				byte[] arr = new byte[byteCount];
-//				StringBuilder stringBuilder = new StringBuilder("Server message received: [");
-//				for (int i = 0; i < byteCount; i++)
-//				{
-//					arr[i] = byteBuf.readByte();
-//					stringBuilder.append(arr[i]);
-//				}
-//				stringBuilder.append("]");
-//				
-//				messageString = stringBuilder.toString();
-//			}
-//			else if (stopAndDisplayInputAsString)
-//			{
-//				messageString = byteBuf.toString(StandardCharsets.UTF_8);
-//			}
-//			
-//			// this is logged as an error so it is easier to see in an Intellij log
-//			LOGGER.error(messageString);
-//			return;
-//		}
-//		
-//		
-//		
-//		
-//		// It is important to ensure malicious server input is ignored.
-//		if (this.serverNetworkingIsMalformed)
-//		{
-//			return;
-//		}
-//		
-//		// check that the incoming message is within the expected size
-//		short commandLength = byteBuf.readShort();
-//		if (commandLength < 1 || commandLength > 32)
-//		{
-//			LOGGER.error("Server command length ["+commandLength+"] outside the expected range of 1 to 32 (inclusive).");
-//			ClientApi.INSTANCE.serverNetworkingIsMalformed = true;
-//			return;
-//		}
-//		
-//		// parse the command
-//		String eventType;
-//		try
-//		{
-//			eventType = byteBuf.readCharSequence(commandLength, StandardCharsets.UTF_8).toString();
-//		}
-//		catch (Exception e)
-//		{
-//			LOGGER.error("Server sent un-parsable command. Error: "+e.getMessage());
-//			return;
-//		}
-//		
-//		switch (eventType)
-//		{
-//			case "ServerCommsEnabled":
-//				LOGGER.info("Server supports DH multiverse protocol.");
-//				ClientApi.INSTANCE.isServerCommunicationEnabled = true;
-//				KEYED_CLIENT_LEVEL_MANAGER.setUseOverrideWrapper(true);
-//				MC.executeOnRenderThread(() -> 
-//				{
-//					// Unload the current world, since it may be wrong.
-//					// A followup WorldChanged event should be received from the server soon after this.
-//					LOGGER.info("Unloading current client level so the server can define the correct multiverse level.");
-//					this.clientLevelUnloadEvent((IClientLevelWrapper) MC.getWrappedClientWorld());
-//				});
-//				break;
-//			
-//			case "LevelChanged":
-//				short levelKeyLength = byteBuf.readShort();
-//				if (levelKeyLength < 1 || levelKeyLength > 128) // TODO 128 should be put into a constant somewhere
-//				{
-//					LOGGER.error("Server [LevelChanged] command length ["+commandLength+"] outside the expected range of 1 to 128 (inclusive).");
-//					this.serverNetworkingIsMalformed = true;
-//					return;
-//				}
-//				
-//				String levelKey = byteBuf.readCharSequence(levelKeyLength, StandardCharsets.UTF_8).toString();
-//				if (!levelKey.matches("[a-zA-Z0-9_]+"))
-//				{
-//					LOGGER.error("Server sent invalid world key name, and is being ignored.");
-//					this.isServerCommunicationEnabled = false;
-//					this.serverNetworkingIsMalformed = true;
-//					return;
-//				}
-//				
-//				LOGGER.info("Server level change event received, changing the level to ["+levelKey+"].");
-//				MC.executeOnRenderThread(() -> {
-//					if (MC.getWrappedClientWorld() != null)
-//					{
-//						this.clientLevelUnloadEvent((IClientLevelWrapper) MC.getWrappedClientWorld());
-//					}
-//					IServerKeyedClientLevel clientLevel = KEYED_CLIENT_LEVEL_MANAGER.getServerKeyedLevel(MC.getWrappedClientWorld(), levelKey);
-//					KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(clientLevel);
-//					this.multiverseClientLevelLoadEvent(clientLevel);
-//				});
-//				break;
-//		}
-//	}
+	
+	public void pluginMessageReceived(@NotNull AbstractNetworkMessage message)
+	{
+		NetworkSession networkSession = this.pluginChannelApi.networkSession;
+		if (networkSession != null)
+		{
+			networkSession.tryHandleMessage(message);
+		}
+	}
 	
 	
 	
@@ -499,7 +409,7 @@ public class ClientApi
 		
 		this.sendQueuedChatMessages();
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.pop(); // get out of "terrain"
 		profiler.push("DH-RenderLevel");
 		
@@ -550,10 +460,24 @@ public class ClientApi
 			{
 				return;
 			}
-			IDhClientLevel level = dhClientWorld.getOrLoadClientLevel(levelWrapper);
+			
+			IDhClientLevel level = (IDhClientLevel) dhClientWorld.getLevel(levelWrapper);
+			if (level == null)
+			{
+				return;
+			}
+			
 			
 			if (this.rendererDisabledBecauseOfExceptions)
 			{
+				// re-enable rendering if the user toggles DH rendering
+				if (!Config.Client.quickEnableRendering.get())
+				{
+					LOGGER.info("DH Renderer re-enabled after exception. Some rendering issues may occur. Please reboot Minecraft if you see any rendering issues.");
+					this.rendererDisabledBecauseOfExceptions = false;
+					Config.Client.quickEnableRendering.set(true);
+				}
+				
 				return;
 			}
 			
@@ -603,10 +527,10 @@ public class ClientApi
 			this.rendererDisabledBecauseOfExceptions = true;
 			LOGGER.error("Unexpected Renderer error in render pass [" + renderPass + "]. Error: " + e.getMessage(), e);
 			
-			MC.sendChatMessage("\u00A74\u00A7l\u00A7uERROR: Distant Horizons renderer has encountered an exception!");
-			MC.sendChatMessage("\u00A74Renderer is now disabled to prevent further issues.");
-			MC.sendChatMessage("\u00A74Please restart your game to re-enable Distant Horizons' LOD rendering.");
-			MC.sendChatMessage("\u00A74Exception detail: " + e);
+			MC_CLIENT.sendChatMessage("\u00A74\u00A7l\u00A7uERROR: Distant Horizons renderer has encountered an exception!");
+			MC_CLIENT.sendChatMessage("\u00A74Renderer disabled to try preventing GL state corruption.");
+			MC_CLIENT.sendChatMessage("\u00A74Toggle DH rendering via the config UI to re-activate DH rendering.");
+			MC_CLIENT.sendChatMessage("\u00A74Error: " + e);
 		}
 		finally
 		{
@@ -646,24 +570,24 @@ public class ClientApi
 		if (glfwKey == GLFW.GLFW_KEY_F8)
 		{
 			Config.Client.Advanced.Debugging.debugRendering.set(EDhApiDebugRendering.next(Config.Client.Advanced.Debugging.debugRendering.get()));
-			MC.sendChatMessage("F8: Set debug mode to " + Config.Client.Advanced.Debugging.debugRendering.get());
+			MC_CLIENT.sendChatMessage("F8: Set debug mode to " + Config.Client.Advanced.Debugging.debugRendering.get());
 		}
 		else if (glfwKey == GLFW.GLFW_KEY_F6)
 		{
 			Config.Client.Advanced.Debugging.rendererMode.set(EDhApiRendererMode.next(Config.Client.Advanced.Debugging.rendererMode.get()));
-			MC.sendChatMessage("F6: Set rendering to " + Config.Client.Advanced.Debugging.rendererMode.get());
+			MC_CLIENT.sendChatMessage("F6: Set rendering to " + Config.Client.Advanced.Debugging.rendererMode.get());
 		}
 		else if (glfwKey == GLFW.GLFW_KEY_P)
 		{
 			prefLoggerEnabled = !prefLoggerEnabled;
-			MC.sendChatMessage("P: Debug Pref Logger is " + (prefLoggerEnabled ? "enabled" : "disabled"));
+			MC_CLIENT.sendChatMessage("P: Debug Pref Logger is " + (prefLoggerEnabled ? "enabled" : "disabled"));
 		}
 	}
 	
 	private void sendQueuedChatMessages()
 	{
 		// dev build
-		if (ModInfo.IS_DEV_BUILD && !this.configOverrideReminderPrinted && MC.playerExists())
+		if (ModInfo.IS_DEV_BUILD && !this.configOverrideReminderPrinted && MC_CLIENT.playerExists())
 		{
 			this.configOverrideReminderPrinted = true;
 			
@@ -673,7 +597,7 @@ public class ClientApi
 					"\u00A72" + "Distant Horizons: nightly/unstable build, version: [" + ModInfo.VERSION+"]." + "\u00A7r\n" +
 					"Issues may occur with this version.\n" +
 					"Here be dragons!\n";
-			MC.sendChatMessage(message);
+			MC_CLIENT.sendChatMessage(message);
 		}
 		
 		// memory
@@ -694,7 +618,7 @@ public class ClientApi
 						"Stuttering or low FPS may occur. \n" +
 						"Please increase Minecraft's available memory to 4 gigabytes. \n" +
 						"This warning can be disabled in DH's config under Advanced -> Logging. \n";
-				MC.sendChatMessage(message);
+				MC_CLIENT.sendChatMessage(message);
 			}
 		}
 		
@@ -707,7 +631,7 @@ public class ClientApi
 				// done to prevent potential null pointers
 				message = "";
 			}
-			MC.sendChatMessage(message);
+			MC_CLIENT.sendChatMessage(message);
 		}
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ClientPluginChannelApi.java

@@ -0,0 +1,134 @@
+package com.seibel.distanthorizons.core.api.internal;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.IKeyedClientLevelManager;
+import com.seibel.distanthorizons.core.level.IServerKeyedClientLevel;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
+import org.apache.logging.log4j.LogManager;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.function.Consumer;
+
+/**
+ * This class is used to manage the level keys.
+ */
+public class ClientPluginChannelApi
+{
+	private static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	private static final IKeyedClientLevelManager KEYED_CLIENT_LEVEL_MANAGER = SingletonInjector.INSTANCE.get(IKeyedClientLevelManager.class);
+	
+	private final Consumer<IServerKeyedClientLevel> levelLoadHandler;
+	private final Consumer<IClientLevelWrapper> levelUnloadHandler;
+	
+	@Nullable
+	public NetworkSession networkSession;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ClientPluginChannelApi(Consumer<IServerKeyedClientLevel> levelLoadHandler, Consumer<IClientLevelWrapper> levelUnloadHandler)
+	{
+		this.levelLoadHandler = levelLoadHandler;
+		this.levelUnloadHandler = levelUnloadHandler;
+	}
+	
+	
+	
+	//============//
+	// properties //
+	//============//
+	
+	/** @return true if the level loading is handled by the server */
+	public boolean allowLevelLoading(IClientLevelWrapper level)
+	{
+		return (KEYED_CLIENT_LEVEL_MANAGER.hasLevelSet() && level instanceof IServerKeyedClientLevel)
+				|| !KEYED_CLIENT_LEVEL_MANAGER.hasLevelSet();
+	}
+	
+	
+	
+	//================//
+	// network events //
+	//================//
+	
+	/** fired when this client connects to a server with DH support */
+	public void onJoinServer(@NonNull NetworkSession networkSession)
+	{
+		Objects.requireNonNull(networkSession);
+		this.networkSession = networkSession;
+		this.networkSession.registerHandler(CurrentLevelKeyMessage.class, this::onCurrentLevelKeyMessage);
+		this.networkSession.registerHandler(CloseInternalEvent.class, this::onClose);
+	}
+	
+	private void onCurrentLevelKeyMessage(CurrentLevelKeyMessage msg)
+	{
+		// prefix@namespace:path
+		// 1-50 characters in total, all parts except namespace can be omitted
+		if (!msg.levelKey.matches("^(?=.{1,50}$)([a-zA-Z0-9-_]+@)?[a-zA-Z0-9-_]+(:[a-zA-Z0-9-_]+)?$"))
+		{
+			throw new IllegalArgumentException("Server sent invalid level key.");
+		}
+		
+		LOGGER.info("Server level key received: [" + msg.levelKey + "].");
+		
+		MC.executeOnRenderThread(() -> 
+		{
+			IClientLevelWrapper clientLevel = MC.getWrappedClientLevel(true);
+			IServerKeyedClientLevel existingKeyedClientLevel = KEYED_CLIENT_LEVEL_MANAGER.getServerKeyedLevel();
+
+			if (existingKeyedClientLevel != null)
+			{
+				if (!existingKeyedClientLevel.getServerLevelKey().equals(msg.levelKey))
+				{
+					LOGGER.info("Unloading previous level with key: [" + existingKeyedClientLevel.getServerLevelKey() + "].");
+					this.levelUnloadHandler.accept(existingKeyedClientLevel);
+				}
+				else
+				{
+					LOGGER.info("Level key matches the previous level key, ignoring the message.");
+				}
+			}
+			else
+			{
+				LOGGER.info("Unloading non-keyed level: [" + clientLevel.getDimensionName() + "].");
+				this.levelUnloadHandler.accept(clientLevel);
+			}
+			
+			if (existingKeyedClientLevel == null || !existingKeyedClientLevel.getServerLevelKey().equals(msg.levelKey))
+			{
+				LOGGER.info("Loading level with key: [" + msg.levelKey + "].");
+				IServerKeyedClientLevel keyedLevel = KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(clientLevel, msg.levelKey);
+				this.levelLoadHandler.accept(keyedLevel);
+			}
+		});
+	}
+	
+	public void onClientLevelUnload() { KEYED_CLIENT_LEVEL_MANAGER.clearKeyedLevel(); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	private void onClose(CloseInternalEvent event) { this.reset(); }
+	public void reset()
+	{
+		this.networkSession = null;
+		KEYED_CLIENT_LEVEL_MANAGER.clearKeyedLevel();
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ServerApi.java

@@ -21,13 +21,9 @@ package com.seibel.distanthorizons.core.api.internal;
 
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
-import com.seibel.distanthorizons.core.config.Config;
-import com.seibel.distanthorizons.core.generation.DhLightingEngine;
-import com.seibel.distanthorizons.core.util.ThreadUtil;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
-import com.seibel.distanthorizons.core.level.IDhLevel;
 import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.core.world.DhClientServerWorld;
 import com.seibel.distanthorizons.core.world.DhServerWorld;
@@ -37,6 +33,7 @@ import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * This holds the methods that should be called by the host mod loader (Fabric,
@@ -70,7 +67,7 @@ public class ServerApi
 			if (serverWorld != null)
 			{
 				serverWorld.serverTick();
-				SharedApi.worldGenTick(serverWorld::doWorldGen);
+				SharedApi.worldGenTick(serverWorld::worldGenTick);
 			}
 		}
 		catch (Exception e)
@@ -154,7 +151,7 @@ public class ServerApi
 		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
 		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
 		{
-			LOGGER.debug("Waiting for player to connect: " + player.getUUID());
+			LOGGER.info("Player [" + player.getName()+ "] joined.");
 			((DhServerWorld) serverWorld).addPlayer(player);
 		}
 	}
@@ -163,9 +160,27 @@ public class ServerApi
 		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
 		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
 		{
-			LOGGER.debug("Removing player from connect wait list: " + player.getUUID());
+			LOGGER.info("Player [" + player.getName() + "] disconnected.");
 			((DhServerWorld) serverWorld).removePlayer(player);
 		}
 	}
+	public void serverPlayerLevelChangeEvent(IServerPlayerWrapper player, IServerLevelWrapper originLevel, IServerLevelWrapper destinationLevel)
+	{
+		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
+		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
+		{
+			LOGGER.info("Player [" + player.getName() + "] changed level: ["+originLevel.getKeyedLevelDimensionName()+"] -> ["+destinationLevel.getKeyedLevelDimensionName()+"].");
+			((DhServerWorld) serverWorld).changePlayerLevel(player, originLevel, destinationLevel);
+		}
+	}
+	
+	public void pluginMessageReceived(IServerPlayerWrapper player, @NotNull AbstractNetworkMessage message)
+	{
+		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
+		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
+		{
+			((DhServerWorld) serverWorld).remotePlayerConnectionHandler.handlePluginMessage(player, message);
+		}
+	}
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/api/internal/SharedApi.java

@@ -24,20 +24,18 @@ import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.generation.DhLightingEngine;
 import com.seibel.distanthorizons.core.level.IDhLevel;
-import com.seibel.distanthorizons.core.level.IDhServerLevel;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.logging.f3.F3Screen;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
-import com.seibel.distanthorizons.core.sql.dto.BeaconBeamDTO;
 import com.seibel.distanthorizons.core.sql.repo.AbstractDhRepo;
 import com.seibel.distanthorizons.core.util.LodUtil;
-import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.util.objects.Pair;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.world.*;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
@@ -45,10 +43,8 @@ import org.apache.logging.log4j.Logger;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.RejectedExecutionException;
-import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.*;
+import java.util.concurrent.locks.ReentrantLock;
 
 /** Contains code and variables used by both {@link ClientApi} and {@link ServerApi} */
 public class SharedApi
@@ -57,17 +53,15 @@ public class SharedApi
 	
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
-	private static final Set<DhChunkPos> UPDATING_CHUNK_POS_SET = ConcurrentHashMap.newKeySet();
-	/** how many chunks can be queued for updating per thread, used to prevent updates from infinitely pilling up if the user flys around extremely fast */
-	private static final int MAX_UPDATING_CHUNK_COUNT_PER_THREAD = 500;
-	private static final int MIN_MS_BETWEEN_OVERLOADED_LOG_MESSAGE = 30_000;
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
-	private static final Timer CHUNK_UPDATE_TIMER = TimerUtil.CreateTimer("ChunkUpdateTimer");
+	private static final UpdateChunkPosManager UPDATE_POS_MANAGER = new UpdateChunkPosManager();
+	/** how many chunks can be queued for updating per thread, used to prevent updates from infinitely pilling up if the user flies around extremely fast */
+	private static final int MAX_UPDATING_CHUNK_COUNT_PER_THREAD = 500;
 	
 	
 	private static AbstractDhWorld currentWorld;
 	private static int lastWorldGenTickDelta = 0;
-	private static long lastOverloadedLogMessageMsTime = 0;
 	
 	
 	
@@ -104,7 +98,7 @@ public class SharedApi
 			// shouldn't be necessary, but if we missed closing one of the connections this should make sure they're all closed
 			AbstractDhRepo.closeAllConnections();
 			// needs to be closed on world shutdown to clear out un-processed chunks
-			UPDATING_CHUNK_POS_SET.clear();
+			UPDATE_POS_MANAGER.clear();
 			
 			// recommend that the garbage collector cleans up any objects from the old world and thread pools
 			System.gc();
@@ -140,10 +134,10 @@ public class SharedApi
 	 * This is important since asking MC for a chunk is slow and may block the render thread.
 	 */
 	public static boolean isChunkAtBlockPosAlreadyUpdating(int blockPosX, int blockPosZ)
-	{ return UPDATING_CHUNK_POS_SET.contains(new DhChunkPos(new DhBlockPos2D(blockPosX, blockPosZ))); }
+	{ return UPDATE_POS_MANAGER.contains(new DhChunkPos(new DhBlockPos2D(blockPosX, blockPosZ))); }
 	
 	public static boolean isChunkAtChunkPosAlreadyUpdating(int chunkPosX, int chunkPosZ)
-	{ return UPDATING_CHUNK_POS_SET.contains(new DhChunkPos(chunkPosX, chunkPosZ)); }
+	{ return UPDATE_POS_MANAGER.contains(new DhChunkPos(chunkPosX, chunkPosZ)); }
 	
 	
 	/** handles both block place and break events */
@@ -192,43 +186,6 @@ public class SharedApi
 		
 		
 		
-		//=====================//
-		// task limiting check //
-		//=====================//
-		
-		int currentQueueCount = UPDATING_CHUNK_POS_SET.size();
-		int maxQueueCount = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
-		if (currentQueueCount >= maxQueueCount)
-		{
-			// The maximum number of chunks are already queued, don't add more.
-			// This is done to prevent overloading the system if the user fly's extremely fast and queues too many chunks
-			
-			long msBetweenLastLog = System.currentTimeMillis() - lastOverloadedLogMessageMsTime;
-			if (msBetweenLastLog >= MIN_MS_BETWEEN_OVERLOADED_LOG_MESSAGE)
-			{
-				lastOverloadedLogMessageMsTime = System.currentTimeMillis();
-				
-				String message = "Distant Horizons overloaded, too many chunks queued for updating. " +
-						"\nThis may result in holes in your LODs. " +
-						"\nPlease move through the world slower, decrease your vanilla render distance, slow down your world pre-generator, or increase the Distant Horizons' CPU load config. " +
-						"\nMax queue count ["+maxQueueCount+"] (["+MAX_UPDATING_CHUNK_COUNT_PER_THREAD+"] per thread).";
-				ClientApi.INSTANCE.showChatMessageNextFrame(message);
-				LOGGER.warn(message);
-			}
-			
-			return;
-		}
-		
-		// prevent duplicate update requests
-		if (UPDATING_CHUNK_POS_SET.contains(chunkWrapper.getChunkPos()))
-		{
-			// this chunk is already being updated
-			return;
-		}
-		UPDATING_CHUNK_POS_SET.add(chunkWrapper.getChunkPos());
-		
-		
-		
 		//===============================//
 		// update the necessary chunk(s) //
 		//===============================//
@@ -237,7 +194,7 @@ public class SharedApi
 		{
 			// only update the center chunk
 			
-			bakeChunkLightingAndSendToLevelAsync(chunkWrapper, null, dhLevel);
+			queueChunkUpdate(chunkWrapper, null, dhLevel);
 		}
 		else
 		{
@@ -258,7 +215,7 @@ public class SharedApi
 					else
 					{
 						// neighboring chunk
-						DhChunkPos neighbourPos = new DhChunkPos(chunkWrapper.getChunkPos().x + xOffset, chunkWrapper.getChunkPos().z + zOffset);
+						DhChunkPos neighbourPos = new DhChunkPos(chunkWrapper.getChunkPos().getX() + xOffset, chunkWrapper.getChunkPos().getZ() + zOffset);
 						IChunkWrapper neighbourChunk = dhLevel.getLevelWrapper().tryGetChunk(neighbourPos);
 						if (neighbourChunk != null)
 						{
@@ -271,127 +228,120 @@ public class SharedApi
 			// light and send the chunks
 			for (IChunkWrapper litChunk : neighbourChunkList)
 			{
-				bakeChunkLightingAndSendToLevelAsync(litChunk, neighbourChunkList, dhLevel);
+				queueChunkUpdate(litChunk, neighbourChunkList, dhLevel);
 			}
 		}
 	}
-	private static void bakeChunkLightingAndSendToLevelAsync(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
+	private static void queueChunkUpdate(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
 	{
-		// lighting the chunk needs to be done on a separate thread to prevent lagging any of the event threads
-		ThreadPoolExecutor executor = ThreadPoolUtil.getLightPopulatorExecutor();
-		if (executor == null)
+		if (MC_CLIENT != null && MC_CLIENT.playerExists())
+		{
+			UPDATE_POS_MANAGER.setCenter(MC_CLIENT.getPlayerChunkPos());
+			UPDATE_POS_MANAGER.maxSize = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
+		}
+		
+		UpdateChunkData updateData = new UpdateChunkData(chunkWrapper, neighbourChunkList, dhLevel);
+		UPDATE_POS_MANAGER.addItem(chunkWrapper.getChunkPos(), updateData);
+		
+		
+		
+		// queue updates up to the number of CPU cores allocated for the job
+		// (this prevents doing extra work queuing tasks that may not be necessary)
+		// and makes sure the chunks closest to the player are updated first
+		ThreadPoolExecutor executor = ThreadPoolUtil.getChunkToLodBuilderExecutor();
+		if (executor != null && executor.getQueue().size() < executor.getCorePoolSize())
+		{
+			try
+			{
+				executor.execute(SharedApi::processQueuedChunkUpdate);
+			}
+			catch (RejectedExecutionException ignore)
+			{
+				// the executor was shut down, it should be back up shortly and able to accept new jobs
+			}
+		}
+	}
+	
+	
+	/** returning a {@link CompletableFuture} isn't necessary, but allows Intellij to properly show the full stack trace when debugging. */
+	@SuppressWarnings("UnusedReturnValue")
+	private static void processQueuedChunkUpdate()
+	{
+		//LOGGER.trace(chunkWrapper.getChunkPos() + " " + executor.getActiveCount() + " / " + executor.getQueue().size() + " - " + executor.getCompletedTaskCount());
+		
+		UpdateChunkData updateData = UPDATE_POS_MANAGER.popClosest();
+		if (updateData == null)
 		{
 			return;
 		}
 		
+		IChunkWrapper chunkWrapper = updateData.chunkWrapper;
+		@Nullable ArrayList<IChunkWrapper> neighbourChunkList = updateData.neighbourChunkList;
+		IDhLevel dhLevel = updateData.dhLevel;
+		
+		
 		try
 		{
-			executor.execute(() ->
+			boolean checkChunkHash = !Config.Client.Advanced.LodBuilding.disableUnchangedChunkCheck.get();
+			
+			// check if this chunk has been converted into an LOD already
+			int oldChunkHash = dhLevel.getChunkHash(chunkWrapper.getChunkPos()); // shouldn't happen on the render thread since it may take a few moments to run
+			int newChunkHash = chunkWrapper.getBlockBiomeHashCode();
+			if (checkChunkHash)
+			{
+				if (oldChunkHash == newChunkHash)
+				{
+					// if the chunk hashes are the same then we don't need to bother with lighting the chunk
+					// or creating/updating the LODs
+					//LOGGER.info("skipping: "+chunkWrapper.getChunkPos()+" "+newChunkHash);
+					return;
+				}
+				else
+				{
+					//LOGGER.info("g: "+chunkWrapper.getChunkPos()+" "+newChunkHash);
+				}
+			}
+			
+			
+			// having a list of the nearby chunks is needed for lighting and beacon generation
+			ArrayList<IChunkWrapper> nearbyChunkList;
+			if (neighbourChunkList != null)
+			{
+				nearbyChunkList = neighbourChunkList;
+			}
+			else
+			{
+				nearbyChunkList = new ArrayList<>(1);
+				nearbyChunkList.add(chunkWrapper);
+			}
+			
+			
+			// sky lighting is populated later at the data source level
+			DhLightingEngine.INSTANCE.bakeChunkBlockLighting(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
+			
+			dhLevel.updateBeaconBeamsForChunk(chunkWrapper, nearbyChunkList);
+			dhLevel.updateChunkAsync(chunkWrapper, newChunkHash);
+		}
+		catch (Exception e)
+		{
+			LOGGER.error("Unexpected error when updating chunk at pos: [" + chunkWrapper.getChunkPos() + "]", e);
+		}
+		finally
+		{
+			// queue the next position if there are still positions to process
+			ThreadPoolExecutor executor = ThreadPoolUtil.getChunkToLodBuilderExecutor();
+			if (executor != null && !UPDATE_POS_MANAGER.positionMap.isEmpty())
 			{
-				//LOGGER.trace(chunkWrapper.getChunkPos() + " " + executor.getActiveCount() + " / " + executor.getQueue().size() + " - " + executor.getCompletedTaskCount());
-				
 				try
 				{
-					// check if this chunk has been converted into an LOD already
-					int oldChunkHash = dhLevel.getChunkHash(chunkWrapper.getChunkPos()); // shouldn't happen on the render thread since it may take a few moments to run
-					int newChunkHash = chunkWrapper.getBlockBiomeHashCode();
-					if (oldChunkHash == newChunkHash)
-					{
-						// if the chunk hashes are the same then we don't need to bother with lighting the chunk
-						// or creating/updating the LODs
-						//LOGGER.info("skipping: "+chunkWrapper.getChunkPos()+" "+newChunkHash);
-						return;
-					}
-					else
-					{
-						//LOGGER.info("g: "+chunkWrapper.getChunkPos()+" "+newChunkHash);
-					}
-					
-					
-					// having a list of the nearby chunks is needed for lighting and beacon generation
-					ArrayList<IChunkWrapper> nearbyChunkList;
-					if (neighbourChunkList != null)
-					{
-						nearbyChunkList = neighbourChunkList;
-					}
-					else
-					{
-						nearbyChunkList = new ArrayList<>(1);
-						nearbyChunkList.add(chunkWrapper);
-					}
-					
-					
-					// chunk light baking is disabled since profiling revealed it used
-					// roughly the same amount of time as generating the lighting ourselves and
-					// was much more likely to have issues with corrupt (all black or all bright) chunks
-					boolean tryUsingMcLightingEngine = false;
-					if (tryUsingMcLightingEngine)
-					{
-						// Save or populate the chunk wrapper's lighting
-						// this is done so we don't have to worry about MC unloading the lighting data for this chunk
-						boolean chunkLightPopulated = false;
-						boolean onlyUseDhLighting = Config.Client.Advanced.LodBuilding.onlyUseDhLightingEngine.get();
-						if (!onlyUseDhLighting && chunkWrapper.isLightCorrect())
-						{
-							// If MC's lighting engine isn't thread safe this may cause the server thread to lag
-							chunkLightPopulated = chunkWrapper.bakeDhLightingUsingMcLightingEngine(dhLevel.getLevelWrapper());
-							if (!chunkLightPopulated)
-							{
-								// clear any existing data to prevent partial or corrupt lighting
-								// when re-generating it
-								chunkWrapper.clearDhBlockLighting();
-								chunkWrapper.clearDhSkyLighting();
-							}
-						}
-						
-						// something went wrong during the baking process so we have to generate the lighting ourselves
-						if (!chunkLightPopulated)
-						{
-							DhLightingEngine.INSTANCE.lightChunk(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
-						}
-					}
-					else
-					{
-						DhLightingEngine.INSTANCE.lightChunk(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
-					}
-					
-					
-					
-					
-					
-					// get this chunk's active beacons
-					List<BeaconBeamDTO> beaconBeamList = chunkWrapper.getAllActiveBeacons(nearbyChunkList);
-					dhLevel.setBeaconBeamsForChunk(chunkWrapper.getChunkPos(), beaconBeamList);
-					
-					
-					dhLevel.updateChunkAsync(chunkWrapper, newChunkHash);
+					executor.execute(SharedApi::processQueuedChunkUpdate);
 				}
-				catch (Exception e)
+				catch (RejectedExecutionException ignore)
 				{
-					LOGGER.error("Unexpected error when updating chunk at pos: [" + chunkWrapper.getChunkPos() + "]", e);
+					// the executor was shut down, it should be back up shortly and able to accept new jobs
 				}
-				finally
-				{
-					// the LOD chunk has finished being updated
-					int updateTimeoutInSec = Config.Client.Advanced.LodBuilding.minTimeBetweenChunkUpdatesInSeconds.get();
-					if (updateTimeoutInSec != 0)
-					{
-						// prevent updating this chunk again until the timeout finishes
-						CHUNK_UPDATE_TIMER.schedule(new TimerTask()
-						{
-							@Override
-							public void run() { UPDATING_CHUNK_POS_SET.remove(chunkWrapper.getChunkPos()); }
-						}, updateTimeoutInSec * 1000L);
-					}
-					else
-					{
-						// instantly allow this chunk to be updated again
-						UPDATING_CHUNK_POS_SET.remove(chunkWrapper.getChunkPos());
-					}
-				}
-			});
+			}
 		}
-		catch (RejectedExecutionException ignore) { /* the executor was shut down, it should be back up shortly and able to accept new jobs */ }
 	}
 	
 	
@@ -402,11 +352,185 @@ public class SharedApi
 	
 	public String getDebugMenuString()
 	{
-		int maxUpdateCount = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
-		String updatingCountStr = F3Screen.NUMBER_FORMAT.format(UPDATING_CHUNK_POS_SET.size());
-		String maxUpdateCountStr = F3Screen.NUMBER_FORMAT.format(maxUpdateCount);
+		String updatingCountStr = F3Screen.NUMBER_FORMAT.format(UPDATE_POS_MANAGER.closestQueue.size());
+		String maxUpdateCountStr = F3Screen.NUMBER_FORMAT.format(UPDATE_POS_MANAGER.maxSize);
 		return "Queued chunk updates: "+updatingCountStr+" / "+maxUpdateCountStr;
 	}
 	
 	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/** contains the objects needed to update a chunk */
+	private static class UpdateChunkData
+	{
+		public IChunkWrapper chunkWrapper;
+		@Nullable
+		public ArrayList<IChunkWrapper> neighbourChunkList;
+		public IDhLevel dhLevel;
+		
+		public UpdateChunkData(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
+		{
+			this.chunkWrapper = chunkWrapper;
+			this.neighbourChunkList = neighbourChunkList;
+			this.dhLevel = dhLevel;
+		}
+	}
+	
+	/** keeps track of which chunks need to be updated */
+	private static class UpdateChunkPosManager
+	{
+		private final PriorityQueue<DhChunkPos> closestQueue;
+		private final PriorityQueue<DhChunkPos> furthestQueue;
+		private final HashMap<DhChunkPos, UpdateChunkData> positionMap;
+		
+		private final ReentrantLock lock = new ReentrantLock();
+		
+		private DhChunkPos center;
+		private int maxSize = 500;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		public UpdateChunkPosManager()
+		{
+			this.closestQueue = new PriorityQueue<>(Comparator.comparingDouble(pos -> pos.squaredDistance(this.center)));
+			this.furthestQueue = new PriorityQueue<>(Comparator.comparingDouble(pos -> ((DhChunkPos)pos).squaredDistance(this.center)).reversed());
+			this.positionMap = new HashMap<>();
+			// defaulting to 0,0 is fine since it'll be updated once we start adding items 
+			this.center = new DhChunkPos(0, 0);
+		}
+		
+		
+		
+		//==================//
+		// list/set methods //
+		//==================//
+		
+		public boolean contains(DhChunkPos pos)
+		{
+			try
+			{
+				this.lock.lock();
+				
+				return this.positionMap.containsKey(pos);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public void clear()
+		{
+			try
+			{
+				this.lock.lock();
+				
+				this.positionMap.clear();
+				this.closestQueue.clear();
+				this.furthestQueue.clear();
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public void addItem(DhChunkPos pos, UpdateChunkData updateData)
+		{
+			try
+			{
+				this.lock.lock();
+				
+				if (this.positionMap.containsKey(pos))
+				{
+					return;
+				}
+				
+				if (this.positionMap.size() >= this.maxSize)
+				{
+					// Remove item furthest from the center
+					DhChunkPos furthest = this.furthestQueue.poll();
+					this.closestQueue.remove(furthest);
+					this.positionMap.remove(furthest);
+				}
+				
+				this.positionMap.put(pos, updateData);
+				this.closestQueue.add(pos);
+				this.furthestQueue.add(pos);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		
+		
+		//==================//
+		// position methods //
+		//==================//
+		
+		public void setCenter(DhChunkPos newCenter)
+		{
+			// if the rebuild time takes too long 
+			// (in James' testing a queue of 500 items only took around 0.1 milliseconds)
+			// this equation could be changed to only update after moving 2 or 4 chunks from the center
+			if (newCenter.equals(this.center))
+			{
+				return;
+			}
+			
+			try
+			{
+				this.lock.lock();
+				
+				this.center = newCenter;
+				
+				// rebuild the priority queues to match the new center
+				this.closestQueue.clear();
+				this.furthestQueue.clear();
+				for (DhChunkPos pos : this.positionMap.keySet())
+				{
+					this.closestQueue.add(pos);
+					this.furthestQueue.add(pos);
+				}
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public UpdateChunkData popClosest()
+		{
+			if (this.closestQueue.isEmpty())
+			{
+				return null;
+			}
+			
+			try
+			{
+				this.lock.lock();
+				
+				DhChunkPos closest = this.closestQueue.poll();
+				this.furthestQueue.remove(closest);
+				return this.positionMap.remove(closest);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+	}
+	
+	
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/config/Config.java

@@ -43,6 +43,7 @@ import javax.swing.*;
 import java.awt.*;
 import java.util.*;
 import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;
 
 
 /**
@@ -60,59 +61,236 @@ public class Config
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	
-	public static ConfigCategory client = new ConfigCategory.Builder().set(Client.class).build();
-	
-	
-	
-	public static class Client
+	private static Config GLOBAL_INSTANCE;
+	public static void initializeGlobalConfig()
 	{
-		public static ConfigEntry<Boolean> quickEnableRendering = new ConfigEntry.Builder<Boolean>()
-				.set(true)
-				.comment(""
-						+ "If true, Distant Horizons will render LODs beyond the vanilla render distance."
-						+ "")
-				.setAppearance(EConfigEntryAppearance.ONLY_IN_GUI)
+		if (GLOBAL_INSTANCE != null)
+		{
+			throw new IllegalStateException("Cannot reinitialize the Config");
+		}
+		GLOBAL_INSTANCE = new Config();
+	}
+	public static Config getGlobalConfig() { return GLOBAL_INSTANCE; }
+	
+	public final QuickSettings quickSettings = new QuickSettings();
+	public final Graphics graphics = new Graphics();
+	
+	public class QuickSettings
+	{
+		public final ConfigEntry<Boolean> enableRendering = new ConfigEntry.Builder<Boolean>()
+				.computed(
+						() -> Config.this.debugging.rendererMode.get() != EDhApiRendererMode.DISABLED,
+						enableRendering -> Config.this.debugging.rendererMode.set(enableRendering
+								? EDhApiRendererMode.DEFAULT
+								: EDhApiRendererMode.DISABLED
+						)
+				)
 				.build();
 		
-		public static ConfigLinkedEntry quickLodChunkRenderDistance = new ConfigLinkedEntry(Advanced.Graphics.Quality.lodChunkRenderDistanceRadius);
-		
-		public static ConfigEntry<EDhApiQualityPreset> qualityPresetSetting = new ConfigEntry.Builder<EDhApiQualityPreset>()
-				.set(EDhApiQualityPreset.MEDIUM) // the default value is set via the listener when accessed
-				.comment(""
-						+ "Changing this setting will modify a number of different settings that will change the \n"
-						+ "visual fidelity of the rendered LODs.\n"
-						+ "\n"
-						+ "Higher settings will improve the graphical quality while increasing GPU and memory use.\n"
-						+ "")
-				.setAppearance(EConfigEntryAppearance.ONLY_IN_GUI)
-				.addListener(RenderQualityPresetConfigEventHandler.INSTANCE)
+		public final ConfigEntry<Integer> lodChunkRenderDistanceRadius = new ConfigEntry.Builder<Integer>()
+				.linkedTo(() -> Config.this.graphics.quality.lodChunkRenderDistanceRadius)
 				.build();
 		
-		public static ConfigEntry<EDhApiThreadPreset> threadPresetSetting = new ConfigEntry.Builder<EDhApiThreadPreset>()
+		public final ConfigEntry<EDhApiQualityPreset> qualityPreset = new ConfigEntry.Builder<EDhApiQualityPreset>()
+				.preset(
+						new ConfigEntry.PresetBuilder<>(EDhApiQualityPreset.CUSTOM)
+								.addConfigEntry(() -> Config.this.graphics.quality.maxHorizontalResolution, map -> {
+									map.put(EDhApiQualityPreset.MINIMUM, EDhApiMaxHorizontalResolution.TWO_BLOCKS);
+									map.put(EDhApiQualityPreset.LOW, EDhApiMaxHorizontalResolution.BLOCK);
+									map.put(EDhApiQualityPreset.MEDIUM, EDhApiMaxHorizontalResolution.BLOCK);
+									map.put(EDhApiQualityPreset.HIGH, EDhApiMaxHorizontalResolution.BLOCK);
+									map.put(EDhApiQualityPreset.EXTREME, EDhApiMaxHorizontalResolution.BLOCK);
+								})
+								.addConfigEntry(() -> Config.this.graphics.quality.verticalQuality, map -> {
+									map.put(EDhApiQualityPreset.MINIMUM, EDhApiVerticalQuality.HEIGHT_MAP);
+									map.put(EDhApiQualityPreset.LOW, EDhApiVerticalQuality.LOW);
+									map.put(EDhApiQualityPreset.MEDIUM, EDhApiVerticalQuality.MEDIUM);
+									map.put(EDhApiQualityPreset.HIGH, EDhApiVerticalQuality.HIGH);
+									map.put(EDhApiQualityPreset.EXTREME, EDhApiVerticalQuality.EXTREME);
+								})
+								.addConfigEntry(() -> Config.this.graphics.quality.horizontalQuality, map -> {
+									map.put(EDhApiQualityPreset.MINIMUM, EDhApiHorizontalQuality.LOWEST);
+									map.put(EDhApiQualityPreset.LOW, EDhApiHorizontalQuality.LOW);
+									map.put(EDhApiQualityPreset.MEDIUM, EDhApiHorizontalQuality.MEDIUM);
+									map.put(EDhApiQualityPreset.HIGH, EDhApiHorizontalQuality.HIGH);
+									map.put(EDhApiQualityPreset.EXTREME, EDhApiHorizontalQuality.EXTREME);
+								})
+								.addConfigEntry(() -> Config.this.graphics.quality.transparency, map -> {
+									map.put(EDhApiQualityPreset.MINIMUM, EDhApiTransparency.DISABLED);
+									map.put(EDhApiQualityPreset.LOW, EDhApiTransparency.DISABLED); // should be fake if/when fake is fixed
+									map.put(EDhApiQualityPreset.MEDIUM, EDhApiTransparency.COMPLETE);
+									map.put(EDhApiQualityPreset.HIGH, EDhApiTransparency.COMPLETE);
+									map.put(EDhApiQualityPreset.EXTREME, EDhApiTransparency.COMPLETE);
+								})
+								.addConfigEntry(() -> Config.this.graphics.quality.ssao.enabled, map -> {
+									map.put(EDhApiQualityPreset.MINIMUM, false);
+									map.put(EDhApiQualityPreset.LOW, false);
+									map.put(EDhApiQualityPreset.MEDIUM, true);
+									map.put(EDhApiQualityPreset.HIGH, true);
+									map.put(EDhApiQualityPreset.EXTREME, true);
+								})
+				)
+				.build();
+		
+		public final ConfigEntry<EDhApiThreadPreset> threadPreset = new ConfigEntry.Builder<EDhApiThreadPreset>()
 				.set(EDhApiThreadPreset.LOW_IMPACT) // the default value is set via the listener when accessed
-				.comment(""
-						+ "Changing this setting will modify a number of different settings that will change \n"
-						+ "the load that Distant Horizons is allowed to put on your CPU. \n"
-						+ "\n"
-						+ "Higher options will improve LOD generation and loading speed, \n"
-						+ "but will increase CPU load and may introduce stuttering.\n"
-						+ "\n"
-						+ "Note: on CPUs with 4 cores or less these settings will be less effective \n"
-						+ "      and some settings will give similar results. \n"
-						+ "")
 				.setAppearance(EConfigEntryAppearance.ONLY_IN_GUI)
 				.addListener(ThreadPresetConfigEventHandler.INSTANCE)
 				.build();
 		
-		public static ConfigLinkedEntry quickEnableWorldGenerator = new ConfigLinkedEntry(Advanced.WorldGenerator.enableDistantGeneration);
+		public final ConfigLinkedEntry quickEnableWorldGenerator = new ConfigLinkedEntry(_Client.Advanced.WorldGenerator.enableDistantGeneration);
 		
-		public static ConfigEntry<Boolean> optionsButton = new ConfigEntry.Builder<Boolean>()
+		public final ConfigLinkedEntry quickLodCloudRendering = new ConfigLinkedEntry(_Client.Advanced.Graphics.GenericRendering.enableCloudRendering);
+		
+		public final ConfigEntry<Boolean> showOptionsButton = new ConfigEntry.Builder<Boolean>()
 				.set(true)
 				.setAppearance(EConfigEntryAppearance.ONLY_IN_FILE)
 				.comment("" +
 						"Should Distant Horizon's config button appear in the options screen next to fov slider?")
 				.build();
 		
+	}
+	
+	
+	public static class Graphics
+	{
+		public final Quality quality = new Quality();
+		
+		public static class Quality
+		{
+			public ConfigEntry<Integer> lodChunkRenderDistanceRadius = new ConfigEntry.Builder<Integer>()
+					.setServersideShortName("renderDistanceRadius")
+					.setMinDefaultMax(32, 128, 4096)
+					.comment("" +
+							"The radius of the mod's render distance. (measured in chunks)\n" +
+							"On server changes the distance players will receive real-time updates for, if enabled." +
+							"\n" +
+							"Note for servers:\n" +
+							"This setting does not prevent players from generating farther out.\n" +
+							"If you want to limit performance impact, change rate limits\n" +
+							"and thread count/runtime ratio settings instead.\n" +
+							"It also does not affect the visuals on clients.")
+					.setPerformance(EConfigEntryPerformance.HIGH)
+					.setSide(EConfigEntryRelevantSide.BOTH)
+					.build();
+			
+			public ConfigEntry<EDhApiMaxHorizontalResolution> maxHorizontalResolution = new ConfigEntry.Builder<EDhApiMaxHorizontalResolution>()
+					.set(EDhApiMaxHorizontalResolution.BLOCK)
+					.comment(""
+							+ "What is the maximum detail LODs should be drawn at? \n"
+							+ "Higher settings will increase memory and GPU usage. \n"
+							+ "\n"
+							+ EDhApiMaxHorizontalResolution.CHUNK + ": render 1 LOD for each Chunk. \n"
+							+ EDhApiMaxHorizontalResolution.HALF_CHUNK + ": render 4 LODs for each Chunk. \n"
+							+ EDhApiMaxHorizontalResolution.FOUR_BLOCKS + ": render 16 LODs for each Chunk. \n"
+							+ EDhApiMaxHorizontalResolution.TWO_BLOCKS + ": render 64 LODs for each Chunk. \n"
+							+ EDhApiMaxHorizontalResolution.BLOCK + ": render 256 LODs for each Chunk (width of one block). \n"
+							+ "\n"
+							+ "Lowest Quality: " + EDhApiMaxHorizontalResolution.CHUNK + "\n"
+							+ "Highest Quality: " + EDhApiMaxHorizontalResolution.BLOCK)
+					.setPerformance(EConfigEntryPerformance.MEDIUM)
+					.build();
+			
+			public ConfigEntry<EDhApiVerticalQuality> verticalQuality = new ConfigEntry.Builder<EDhApiVerticalQuality>()
+					.set(EDhApiVerticalQuality.MEDIUM)
+					.comment(""
+							+ "This indicates how well LODs will represent \n"
+							+ "overhangs, caves, floating islands, etc. \n"
+							+ "Higher options will make the world more accurate, but"
+							+ "will increase memory and GPU usage. \n"
+							+ "\n"
+							+ "Lowest Quality: " + EDhApiVerticalQuality.HEIGHT_MAP + "\n"
+							+ "Highest Quality: " + EDhApiVerticalQuality.EXTREME)
+					.setPerformance(EConfigEntryPerformance.VERY_HIGH)
+					.addListener(ReloadLodsConfigEventHandler.INSTANCE)
+					.build();
+			
+			public ConfigEntry<EDhApiHorizontalQuality> horizontalQuality = new ConfigEntry.Builder<EDhApiHorizontalQuality>()
+					.set(EDhApiHorizontalQuality.MEDIUM)
+					.comment(""
+							+ "This indicates how quickly LODs decrease in quality the further away they are. \n"
+							+ "Higher settings will render higher quality fake chunks farther away, \n"
+							+ "but will increase memory and GPU usage.")
+					.setPerformance(EConfigEntryPerformance.MEDIUM)
+					.build();
+			
+			public ConfigEntry<EDhApiTransparency> transparency = new ConfigEntry.Builder<EDhApiTransparency>()
+					.set(EDhApiTransparency.COMPLETE)
+					.comment(""
+							+ "How should LOD transparency be handled. \n"
+							+ "\n"
+							+ EDhApiTransparency.COMPLETE + ": LODs will render transparent. \n"
+							+ EDhApiTransparency.FAKE + ": LODs will be opaque, but shaded to match the blocks underneath. \n"
+							+ EDhApiTransparency.DISABLED + ": LODs will be opaque. \n"
+							+ "")
+					.setPerformance(EConfigEntryPerformance.MEDIUM)
+					.addListener(ReloadLodsConfigEventHandler.INSTANCE)
+					.build();
+			
+			
+			public ConfigEntry<EDhApiBlocksToAvoid> blocksToIgnore = new ConfigEntry.Builder<EDhApiBlocksToAvoid>()
+					.set(EDhApiBlocksToAvoid.NON_COLLIDING)
+					.comment(""
+							+ "What blocks shouldn't be rendered as LODs? \n"
+							+ "\n"
+							+ EDhApiBlocksToAvoid.NONE + ": Represent all blocks in the LODs \n"
+							+ EDhApiBlocksToAvoid.NON_COLLIDING + ": Only represent solid blocks in the LODs (tall grass, torches, etc. won't count for a LOD's height) \n"
+							+ "")
+					.setPerformance(EConfigEntryPerformance.NONE)
+					.addListener(ReloadLodsConfigEventHandler.INSTANCE)
+					.build();
+			
+			public ConfigEntry<Boolean> tintWithAvoidedBlocks = new ConfigEntry.Builder<Boolean>()
+					.set(true)
+					.comment(""
+							+ "Should the blocks underneath avoided blocks gain the color of the avoided block? \n"
+							+ "\n"
+							+ "True: a red flower will tint the grass below it red. \n"
+							+ "False: skipped blocks will not change color of surface below them. "
+							+ "")
+					.setPerformance(EConfigEntryPerformance.NONE)
+					.addListener(ReloadLodsConfigEventHandler.INSTANCE)
+					.build();
+			
+			// TODO fixme
+			//public static ConfigEntry<Integer> lodBiomeBlending = new ConfigEntry.Builder<Integer>()
+			//		.setMinDefaultMax(0,1,7)
+			//		.comment(""
+			//				+ "This is the same as vanilla Biome Blending settings for Lod area. \n"
+			//				+ "    Note that anything other than '0' will greatly effect Lod building time \n"
+			//				+ "     and increase triangle count. The cost on chunk generation speed is also \n"
+			//				+ "     quite large if set too high.\n"
+			//				+ "\n"
+			//				+ "    '0' equals to Vanilla Biome Blending of '1x1' or 'OFF', \n"
+			//				+ "    '1' equals to Vanilla Biome Blending of '3x3', \n"
+			//				+ "    '2' equals to Vanilla Biome Blending of '5x5'...")
+			//		.build();
+			
+		}
+		
+	}
+	
+	public final Debugging debugging = new Debugging();
+	
+	public static class Debugging
+	{
+		public ConfigEntry<EDhApiRendererMode> rendererMode = new ConfigEntry.Builder<EDhApiRendererMode>()
+				.set(EDhApiRendererMode.DEFAULT)
+				.comment(""
+						+ "What renderer is active? \n"
+						+ "\n"
+						+ EDhApiRendererMode.DEFAULT + ": Default lod renderer \n"
+						+ EDhApiRendererMode.DEBUG + ": Debug testing renderer \n"
+						+ EDhApiRendererMode.DISABLED + ": Disable rendering")
+				.build();
+		
+	}
+	
+	
+	public static class _Client
+	{
+		
+		
 		
 		
 		public static ConfigCategory advanced = new ConfigCategory.Builder().set(Advanced.class).build();
@@ -143,102 +321,6 @@ public class Config
 				
 				public static class Quality
 				{
-					public static ConfigEntry<EDhApiMaxHorizontalResolution> maxHorizontalResolution = new ConfigEntry.Builder<EDhApiMaxHorizontalResolution>()
-							.set(EDhApiMaxHorizontalResolution.BLOCK)
-							.comment(""
-									+ "What is the maximum detail LODs should be drawn at? \n"
-									+ "Higher settings will increase memory and GPU usage. \n"
-									+ "\n"
-									+ EDhApiMaxHorizontalResolution.CHUNK + ": render 1 LOD for each Chunk. \n"
-									+ EDhApiMaxHorizontalResolution.HALF_CHUNK + ": render 4 LODs for each Chunk. \n"
-									+ EDhApiMaxHorizontalResolution.FOUR_BLOCKS + ": render 16 LODs for each Chunk. \n"
-									+ EDhApiMaxHorizontalResolution.TWO_BLOCKS + ": render 64 LODs for each Chunk. \n"
-									+ EDhApiMaxHorizontalResolution.BLOCK + ": render 256 LODs for each Chunk (width of one block). \n"
-									+ "\n"
-									+ "Lowest Quality: " + EDhApiMaxHorizontalResolution.CHUNK + "\n"
-									+ "Highest Quality: " + EDhApiMaxHorizontalResolution.BLOCK)
-							.setPerformance(EConfigEntryPerformance.MEDIUM)
-							.build();
-					
-					public static ConfigEntry<Integer> lodChunkRenderDistanceRadius = new ConfigEntry.Builder<Integer>()
-							.setMinDefaultMax(32, 128, 4096)
-							.comment("The radius of the mod's render distance. (measured in chunks)")
-							.setPerformance(EConfigEntryPerformance.HIGH)
-							.build();
-					
-					public static ConfigEntry<EDhApiVerticalQuality> verticalQuality = new ConfigEntry.Builder<EDhApiVerticalQuality>()
-							.set(EDhApiVerticalQuality.MEDIUM)
-							.comment(""
-									+ "This indicates how well LODs will represent \n"
-									+ "overhangs, caves, floating islands, etc. \n"
-									+ "Higher options will make the world more accurate, but"
-									+ "will increase memory and GPU usage. \n"
-									+ "\n"
-									+ "Lowest Quality: " + EDhApiVerticalQuality.HEIGHT_MAP + "\n"
-									+ "Highest Quality: " + EDhApiVerticalQuality.EXTREME)
-							.setPerformance(EConfigEntryPerformance.VERY_HIGH)
-							.addListener(ReloadLodsConfigEventHandler.INSTANCE)
-							.build();
-					
-					public static ConfigEntry<EDhApiHorizontalQuality> horizontalQuality = new ConfigEntry.Builder<EDhApiHorizontalQuality>()
-							.set(EDhApiHorizontalQuality.MEDIUM)
-							.comment(""
-									+ "This indicates how quickly LODs decrease in quality the further away they are. \n"
-									+ "Higher settings will render higher quality fake chunks farther away, \n"
-									+ "but will increase memory and GPU usage.")
-							.setPerformance(EConfigEntryPerformance.MEDIUM)
-							.build();
-					
-					public static ConfigEntry<EDhApiTransparency> transparency = new ConfigEntry.Builder<EDhApiTransparency>()
-							.set(EDhApiTransparency.COMPLETE)
-							.comment(""
-									+ "How should LOD transparency be handled. \n"
-									+ "\n"
-									+ EDhApiTransparency.COMPLETE + ": LODs will render transparent. \n"
-									+ EDhApiTransparency.FAKE + ": LODs will be opaque, but shaded to match the blocks underneath. \n"
-									+ EDhApiTransparency.DISABLED + ": LODs will be opaque. \n"
-									+ "")
-							.setPerformance(EConfigEntryPerformance.MEDIUM)
-							.addListener(ReloadLodsConfigEventHandler.INSTANCE)
-							.build();
-					
-					public static ConfigEntry<EDhApiBlocksToAvoid> blocksToIgnore = new ConfigEntry.Builder<EDhApiBlocksToAvoid>()
-							.set(EDhApiBlocksToAvoid.NON_COLLIDING)
-							.comment(""
-									+ "What blocks shouldn't be rendered as LODs? \n"
-									+ "\n"
-									+ EDhApiBlocksToAvoid.NONE + ": Represent all blocks in the LODs \n"
-									+ EDhApiBlocksToAvoid.NON_COLLIDING + ": Only represent solid blocks in the LODs (tall grass, torches, etc. won't count for a LOD's height) \n"
-									+ "")
-							.setPerformance(EConfigEntryPerformance.NONE)
-							.addListener(ReloadLodsConfigEventHandler.INSTANCE)
-							.build();
-					
-					public static ConfigEntry<Boolean> tintWithAvoidedBlocks = new ConfigEntry.Builder<Boolean>()
-							.set(true)
-							.comment(""
-									+ "Should the blocks underneath avoided blocks gain the color of the avoided block? \n"
-									+ "\n"
-									+ "True: a red flower will tint the grass below it red. \n"
-									+ "False: skipped blocks will not change color of surface below them. "
-									+ "")
-							.setPerformance(EConfigEntryPerformance.NONE)
-							.addListener(ReloadLodsConfigEventHandler.INSTANCE)
-							.build();
-					
-					// TODO fixme
-//					public static ConfigEntry<Integer> lodBiomeBlending = new ConfigEntry.Builder<Integer>()
-//							.setMinDefaultMax(0,1,7)
-//							.comment(""
-//									+ "This is the same as vanilla Biome Blending settings for Lod area. \n"
-//									+ "    Note that anything other than '0' will greatly effect Lod building time \n"
-//									+ "     and increase triangle count. The cost on chunk generation speed is also \n"
-//									+ "     quite large if set too high.\n"
-//									+ "\n"
-//									+ "    '0' equals to Vanilla Biome Blending of '1x1' or 'OFF', \n"
-//									+ "    '1' equals to Vanilla Biome Blending of '3x3', \n"
-//									+ "    '2' equals to Vanilla Biome Blending of '5x5'...")
-//							.build();
 				}
 				
 				public static class Fog
@@ -699,6 +781,17 @@ public class Config
 							.addListener(ReloadLodsConfigEventHandler.INSTANCE)
 							.build();
 					
+					public static ConfigEntry<Boolean> disableBeaconDistanceCulling = new ConfigEntry.Builder<Boolean>()
+							.set(false)
+							.comment(""
+									+ "If true all beacons near the camera won't be drawn to prevent vanilla overdraw. \n"
+									+ "If false all beacons will be rendered. \n"
+									+ "\n"
+									+ "Generally this should be left as false. It's main purpose is for debugging\n"
+									+ "beacon updating/rendering.\n"
+									+ "")
+							.build();
+					
 				}
 				
 			}
@@ -706,16 +799,16 @@ public class Config
 			public static class WorldGenerator
 			{
 				public static ConfigEntry<Boolean> enableDistantGeneration = new ConfigEntry.Builder<Boolean>()
+						.setServersideShortName("enableDistantGeneration")
 						.set(true)
 						.comment(""
 								+ " Should Distant Horizons slowly generate LODs \n"
-								+ " outside the vanilla render distance?\n"
-								+ "\n"
-								+ " Note: when on a server, distant generation isn't supported \n"
-								+ " and will always be disabled.")
+								+ " outside the vanilla render distance?")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiDistantGeneratorMode> distantGeneratorMode = new ConfigEntry.Builder<EDhApiDistantGeneratorMode>()
+						.setServersideShortName("distantGeneratorMode")
 						.set(EDhApiDistantGeneratorMode.FEATURES)
 						.comment(""
 								+ "How detailed should LODs be generated outside the vanilla render distance? \n"
@@ -745,32 +838,36 @@ public class Config
 								+ EDhApiDistantGeneratorMode.FEATURES + " \n"
 								+ "Generate everything except structures. \n"
 								+ "WARNING: This may cause world generator bugs or instability when paired with certain world generator mods. \n"
+								//not currently implemented
+								//+ "\n"
+								//+ EDhApiDistantGeneratorMode.FULL + " \n"
+								//+ "Ask the local server to generate/load each chunk. \n"
+								//+ "This is the most compatible, but will cause server/simulation lag. \n"
+								//+ "- Slow (15-50 ms, with spikes up to 200 ms) \n"
 								+ "")
-						/*
-							// FULL isn't currently implemented
-							+ "\n"
-							+ EDhApiDistantGeneratorMode.FULL + " \n"
-							+ "Ask the local server to generate/load each chunk. \n"
-							+ "This is the most compatible, but will cause server/simulation lag. \n"
-							+ "- Slow (15-50 ms, with spikes up to 200 ms) \n"
-						*/
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<Integer> worldGenerationTimeoutLengthInSeconds = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("worldGenerationTimeout")
 						.setMinDefaultMax(5, 60 * 3, 60 * 10/*10 minutes*/ )
 						.comment(""
 								+ "How long should a world generator thread run for before timing out? \n"
 								+ "Note: If you are experiencing timeout errors it is better to lower your CPU usage first \n"
 								+ "via the thread config before changing this value. \n"
 								+ "")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 			}
 			
 			public static class LodBuilding
 			{
+				@Deprecated
 				public static ConfigEntry<Integer> minTimeBetweenChunkUpdatesInSeconds = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("minTimeBetweenChunkUpdates")
 						.setMinDefaultMax(0, 1, 60)
+						.setAppearance(EConfigEntryAppearance.ONLY_IN_API)
 						.comment(""
 								+ "Determines how long must pass between LOD chunk updates before another. \n"
 								+ "update can occur\n"
@@ -780,6 +877,19 @@ public class Config
 								+ "")
 						.build();
 				
+				public static ConfigEntry<Boolean> disableUnchangedChunkCheck = new ConfigEntry.Builder<Boolean>()
+						.set(false)
+						.comment(""
+								+ "Normally DH will attempt to skip creating LODs for chunks it's already seen\n"
+								+ "and that haven't changed.\n"
+								+ "\n"
+								+ "However sometimes that logic incorrecly prevents LODs from being updated.\n"
+								+ "Disabling this check may fix issues where LODs aren't updated after\n"
+								+ "blocks have been changed.\n"
+								+ "")
+						.build();
+				
+				/** Currently we always use the DH lighting engine because there's a high likelyhood of MC returning incorrect lighting otherwise */
 				@Deprecated
 				public static ConfigEntry<Boolean> onlyUseDhLightingEngine = new ConfigEntry.Builder<Boolean>()
 						.set(false)
@@ -858,7 +968,7 @@ public class Config
 						.build();
 				
 				public static ConfigEntry<String> ignoredRenderBlockCsv = new ConfigEntry.Builder<String>()
-						.set("minecraft:barrier,minecraft:structure_void,minecraft:light,minecraft:tripwire")
+						.set("minecraft:barrier,minecraft:structure_void,minecraft:light,minecraft:tripwire,minecraft:brown_mushroom")
 						.comment(""
 								+ "A comma separated list of block resource locations that won't be rendered by DH. \n"
 								+ "Note: air is always included in this list. \n"
@@ -939,27 +1049,98 @@ public class Config
 								+ "")
 						.build();
 				
-				// not currently implemented
-				private static ConfigEntry<Boolean> enableMultiverseNetworking = new ConfigEntry.Builder<Boolean>()
-						.set(true)
-						.comment(""
-								+ "If true Distant Horizons will attempt to communicate with the connected \n"
-								+ "server in order to improve multiverse support. \n"
-								+ "")
-						.build();
 				
-				// not currently implemented
-				private static ConfigEntry<Boolean> enableServerNetworking = new ConfigEntry.Builder<Boolean>()
-						.set(false)
-						.comment(""
-								+ "Attention: this is only for developers and hasn't been implemented.\n"
-								+ "\n"
-								+ "If true Distant Horizons will attempt to communicate with the connected \n"
-								+ "server in order to load LODs outside your vanilla render distance. \n"
-								+ "\n"
-								+ "Note: This requires DH to be installed on the server in order to function. \n"
-								+ "")
-						.build();
+				
+				public static ConfigCategory serverNetworking = new ConfigCategory.Builder().set(ServerNetworking.class).build();
+				
+				public static class ServerNetworking
+				{
+					public static ConfigUIComment generalSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> enableServerNetworking = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("enableServerNetworking")
+							.set(true)
+							.comment(""
+									+ "WARNING!\n"
+									+ "Server-client networking is not yet fully implemented!\n"
+									+ "Both the server and client must be running the server-side fork with this option enabled\n"
+									+ "for Distant Horizons data to be transceived.\n"
+									+ "\n"
+									+ "If true, the server and client will attempt to communicate to transceive Distant Horizons data.\n"
+									+ "This allows for further distant generation and LOD updates on all clients.\n"
+									+ "\n"
+									+ "This should only be used on trusted servers with trusted players!\n"
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					public static ConfigEntry<Boolean> sendLevelKeys = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("sendLevelKeys")
+							.setAppearance(EConfigEntryAppearance.ONLY_IN_FILE)
+							.set(true)
+							.comment(""
+									+ "Makes the server send level keys for each world.\n"
+									+ "Disable this if you use alternative ways to send level keys.\n"
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					public static ConfigEntry<String> levelKeyPrefix = new ConfigEntry.Builder<String>()
+							.setServersideShortName("levelKeyPrefix")
+							.setAppearance(EConfigEntryAppearance.ONLY_IN_FILE)
+							.set(getDefaultLevelKeyPrefix())
+							.comment(""
+									+ "Prefix of the level keys sent to the clients.\n"
+									+ "Should be set to a unique value for each backend server behind a proxy,\n"
+									+ "or empty if you don't use a proxy.\n"
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					public static ConfigUIComment generationSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Integer> generationRequestRateLimit = new ConfigEntry.Builder<Integer>()
+							.setServersideShortName("generationRequestRateLimit")
+							.setMinDefaultMax(1, 20, 100)
+							.comment(""
+									+ "How many LOD generation requests per second should a client send? \n"
+									+ "Also limits the amount of player's requests allowed to stay in the server's queue."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					public static ConfigUIComment realTimeUpdatesSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> enableRealTimeUpdates = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("enableRealTimeUpdates")
+							.set(false)
+							.comment(""
+									+ "If true, the client will receive real-time LOD updates for chunks outside the client's render distance."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					// TODO rename
+					public static ConfigUIComment syncOnLoginSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> synchronizeOnLogin = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("synchronizeOnLogin")
+							.set(false)
+							.comment(""
+									+ "If true, clients will receive updated LODs on join if any changes occurred since last join."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					public static ConfigEntry<Integer> syncOnLoginRateLimit = new ConfigEntry.Builder<Integer>()
+							.setServersideShortName("syncOnLoginRateLimit")
+							.setMinDefaultMax(1, 50, 100)
+							.comment(""
+									+ "How many LOD sync requests per second should a client send? \n"
+									+ "Also limits the amount of player's requests allowed to stay in the server's queue."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+				}
 				
 			}
 			
@@ -981,6 +1162,7 @@ public class Config
 				
 				
 				public static final ConfigEntry<Integer> numberOfWorldGenerationThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfWorldGenerationThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getWorldGenDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -994,13 +1176,17 @@ public class Config
 								+ "generation speed, increase this number. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForWorldGenerationThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForWorldGenerationThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getWorldGenDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfFileHandlerThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfFileHandlerThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getFileHandlerDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -1012,10 +1198,13 @@ public class Config
 								+ "quickly flying through existing LODs. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForFileHandlerThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForFileHandlerThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getFileHandlerDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfUpdatePropagatorThreads = new ConfigEntry.Builder<Integer>()
@@ -1044,6 +1233,7 @@ public class Config
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfLodBuilderThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfLodBuilderThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getLodBuilderDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -1054,12 +1244,16 @@ public class Config
 								+ "certain graphics settings are changed, and when moving around the world. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForLodBuilderThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForLodBuilderThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getLodBuilderDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Boolean> enableLodBuilderThreadLimiting = new ConfigEntry.Builder<Boolean>()
+						.setServersideShortName("enableLodBuilderThreadLimiting")
 						.set(true)
 						.comment(""
 								+ "Should only be disabled if deadlock occurs and LODs refuse to update. \n"
@@ -1067,8 +1261,29 @@ public class Config
 								+ "\n"
 								+ "Note that if deadlock did occur restarting MC may be necessary to stop the locked threads. \n"
 								+ "")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
+				public static final ConfigEntry<Integer> numberOfNetworkCompressionThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfNetworkCompressionThreads")
+						.setMinDefaultMax(1,
+								ThreadPresetConfigEventHandler.getNetworkCompressionDefaultThreadCount(),
+								Runtime.getRuntime().availableProcessors())
+						.comment(""
+								+ "How many threads should be used when (de)compressing LODs \n"
+								+ "that are received/sent over the network?\n"
+								+ "\n"
+								+ "This pool doesn't do anything in singleplayer or when connected \n"
+								+ "to a server that doesn't support DH networking. \n"
+								+ "\n"
+								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
+						.build();
+				public static final ConfigEntry<Double> runTimeRatioForNetworkCompressionThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForNetworkCompressionThreads")
+						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getNetworkCompressionDefaultRunTimeRatio(), 1.0)
+						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.build();
 			}
 			
 			public static class AutoUpdater
@@ -1102,31 +1317,39 @@ public class Config
 				// TODO add change all option
 				// TODO default to error chat and info file
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenPerformance = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenPerformance")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log performance about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenLoadEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenPerformance")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logLodBuilderEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logLodBuilderEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the LOD generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logRendererBufferEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
@@ -1144,24 +1367,30 @@ public class Config
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logFileReadWriteEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logFileReadWriteEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about file read/write operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logFileSubDimEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logFileSubDimEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about file sub-dimension operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logNetworkEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logNetworkEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about network operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				
@@ -1573,4 +1802,17 @@ public class Config
 		}
 	}
 	
+	private static String getDefaultLevelKeyPrefix()
+	{
+		IMinecraftSharedWrapper mcWrapper = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+		if (!mcWrapper.isDedicatedServer() || mcWrapper.isWorldNew())
+		{
+			return "";
+		}
+		else
+		{
+			return "server" + ThreadLocalRandom.current().nextInt(1, 1000); 
+		}
+	}
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/config/IConfigProvider.java

@@ -0,0 +1,6 @@
+package com.seibel.distanthorizons.core.config;
+
+public interface IConfigProvider
+{
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/RenderCacheConfigEventHandler.java

@@ -102,7 +102,7 @@ public class RenderCacheConfigEventHandler
 		// create a new timer task
 		TimerTask timerTask = new TimerTask()
 		{
-			public void run()
+			@Override public void run()
 			{
 				DhApi.Delayed.renderProxy.clearRenderDataCache();
 			}

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/ResetConfigEventHandler.java

@@ -32,7 +32,7 @@ public class ResetConfigEventHandler
 	/** private since we only ever need one handler at a time */
 	private ResetConfigEventHandler()
 	{
-		this.configChangeListener = new ConfigChangeListener<>(Config.Client.ResetConfirmation.resetAllSettings, (resetSettings) -> { doStuff(resetSettings); });
+		this.configChangeListener = new ConfigChangeListener<>(Config.Client.ResetConfirmation.resetAllSettings, (resetSettings) -> { this.doStuff(resetSettings); });
 		
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/presets/AbstractPresetConfigEventHandler.java

@@ -19,7 +19,6 @@
 
 package com.seibel.distanthorizons.core.config.eventHandlers.presets;
 
-import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.config.ConfigBase;
 import com.seibel.distanthorizons.core.config.ConfigEntryWithPresetOptions;
 import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
@@ -30,6 +29,7 @@ import com.seibel.distanthorizons.coreapi.interfaces.config.IConfigEntry;
 import com.seibel.distanthorizons.coreapi.util.StringUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
 
@@ -38,6 +38,7 @@ public abstract class AbstractPresetConfigEventHandler<TPresetEnum extends Enum<
 	private static final Logger LOGGER = LogManager.getLogger();
 	private static final long MS_DELAY_BEFORE_APPLYING_PRESET = 3_000;
 	
+	@Nullable
 	private static IConfigGui configGui = SingletonInjector.INSTANCE.get(IConfigGui.class);
 	private static boolean guiListenersAdded = false;
 	
@@ -57,7 +58,11 @@ public abstract class AbstractPresetConfigEventHandler<TPresetEnum extends Enum<
 	
 	public AbstractPresetConfigEventHandler()
 	{
-		configGui.addOnScreenChangeListener(() -> this.onConfigUiClosed());
+		// don't update the UI when running on a server
+		if (configGui != null) 
+		{
+			configGui.addOnScreenChangeListener(this::onConfigUiClosed);
+		}
 	}
 	
 	

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/presets/RenderQualityPresetConfigEventHandler.java

@@ -33,6 +33,7 @@ import org.apache.logging.log4j.Logger;
 
 import java.util.*;
 
+@SuppressWarnings("FieldCanBeLocal")
 public class RenderQualityPresetConfigEventHandler extends AbstractPresetConfigEventHandler<EDhApiQualityPreset>
 {
 	public static final RenderQualityPresetConfigEventHandler INSTANCE = new RenderQualityPresetConfigEventHandler();

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/presets/ThreadPresetConfigEventHandler.java

@@ -32,6 +32,7 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 
+@SuppressWarnings("FieldCanBeLocal")
 public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHandler<EDhApiThreadPreset>
 {
 	public static final ThreadPresetConfigEventHandler INSTANCE = new ThreadPresetConfigEventHandler();
@@ -128,6 +129,28 @@ public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHan
 			}});
 	
 	
+	public static int getNetworkCompressionDefaultThreadCount() { return getThreadCountByPercent(0.3); }
+	private final ConfigEntryWithPresetOptions<EDhApiThreadPreset, Integer> networkCompressionThreadCount = new ConfigEntryWithPresetOptions<>(Config.Client.Advanced.MultiThreading.numberOfNetworkCompressionThreads,
+			new HashMap<EDhApiThreadPreset, Integer>()
+			{{
+				this.put(EDhApiThreadPreset.MINIMAL_IMPACT, 1);
+				this.put(EDhApiThreadPreset.LOW_IMPACT, getNetworkCompressionDefaultThreadCount());
+				this.put(EDhApiThreadPreset.BALANCED, getThreadCountByPercent(0.4));
+				this.put(EDhApiThreadPreset.AGGRESSIVE, getThreadCountByPercent(0.6));
+				this.put(EDhApiThreadPreset.I_PAID_FOR_THE_WHOLE_CPU, getThreadCountByPercent(0.8));
+			}});
+	public static double getNetworkCompressionDefaultRunTimeRatio() { return 0.5; }
+	private final ConfigEntryWithPresetOptions<EDhApiThreadPreset, Double> networkCompressionRunTime = new ConfigEntryWithPresetOptions<>(Config.Client.Advanced.MultiThreading.runTimeRatioForNetworkCompressionThreads,
+			new HashMap<EDhApiThreadPreset, Double>()
+			{{
+				this.put(EDhApiThreadPreset.MINIMAL_IMPACT, 0.25);
+				this.put(EDhApiThreadPreset.LOW_IMPACT, getNetworkCompressionDefaultRunTimeRatio());
+				this.put(EDhApiThreadPreset.BALANCED, 0.75);
+				this.put(EDhApiThreadPreset.AGGRESSIVE, 1.0);
+				this.put(EDhApiThreadPreset.I_PAID_FOR_THE_WHOLE_CPU, 1.0);
+			}});
+	
+	
 	
 	//==============//
 	// constructors //
@@ -149,6 +172,9 @@ public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHan
 		this.configList.add(this.lodBuilderThreadCount);
 		this.configList.add(this.lodBuilderRunTime);
 		
+		this.configList.add(this.networkCompressionThreadCount);
+		this.configList.add(this.networkCompressionRunTime);
+		
 		
 		for (ConfigEntryWithPresetOptions<EDhApiThreadPreset, ?> config : this.configList)
 		{

core/src/main/java/com/seibel/distanthorizons/core/config/file/ConfigFileHandling.java

@@ -20,11 +20,13 @@
 package com.seibel.distanthorizons.core.config.file;
 
 import com.electronwill.nightconfig.core.file.CommentedFileConfig;
+import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryRelevantSide;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.config.ConfigBase;
 import com.seibel.distanthorizons.core.config.types.AbstractConfigType;
 import com.seibel.distanthorizons.core.config.types.ConfigEntry;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -40,23 +42,35 @@ import java.nio.file.Path;
  */
 public class ConfigFileHandling
 {
+	private static final IMinecraftSharedWrapper MC_SHARED = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+	
+	
 	public final ConfigBase configBase;
 	public final Path configPath;
 	
-	private final Logger LOGGER;
+	private final Logger logger;
 	
 	/** This is the object for night-config */
 	private final CommentedFileConfig nightConfig;
 	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
 	public ConfigFileHandling(ConfigBase configBase, Path configPath)
 	{
-		this.LOGGER = LogManager.getLogger(this.getClass().getSimpleName() + ", " + configBase.modID);
+		this.logger = LogManager.getLogger(this.getClass().getSimpleName() + ", " + configBase.modID);
 		this.configBase = configBase;
 		this.configPath = configPath;
 		
 		this.nightConfig = CommentedFileConfig.builder(this.configPath.toFile()).build();
 	}
 	
+	
+	
+	
 	/** Saves the entire config to the file */
 	public void saveToFile()
 	{
@@ -102,7 +116,7 @@ public class ConfigFileHandling
 	 */
 	public void loadFromFile()
 	{
-		int currentCfgVersion = configBase.configVersion;
+		int currentCfgVersion = this.configBase.configVersion;
 		try
 		{
 			// Dont load the real `this.nightConfig`, instead create a tempoary one
@@ -113,27 +127,29 @@ public class ConfigFileHandling
 			tmpNightConfig.close();
 		} catch (Exception ignored) { }
 		
-		if (currentCfgVersion == configBase.configVersion)
-		{}
-		else if (currentCfgVersion > configBase.configVersion)
+		if (currentCfgVersion == this.configBase.configVersion)
 		{
-			LOGGER.warn("Found config version [" + String.valueOf(currentCfgVersion) + "] which is newer than current mods config version of [" + String.valueOf(configBase.configVersion) + "]. You may have downgraded the mod and items may have been moved, you have been warned");
+			// handle normally
+		}
+		else if (currentCfgVersion > this.configBase.configVersion)
+		{
+			this.logger.warn("Found config version [" + currentCfgVersion + "] which is newer than current mods config version of [" + this.configBase.configVersion + "]. You may have downgraded the mod and items may have been moved, you have been warned");
 		}
 		else // if (currentCfgVersion < configBase.configVersion)
 		{
-			LOGGER.warn(configBase.modName +" config is of an older version, currently there is no config updater... so resetting config");
+			this.logger.warn(this.configBase.modName +" config is of an older version, currently there is no config updater... so resetting config");
 			try
 			{
-				Files.delete(configPath);
+				Files.delete(this.configPath);
 			}
 			catch (Exception e)
 			{
-				LOGGER.error(e);
+				this.logger.error(e);
 			}
 		}
 		
-		loadFromFile(nightConfig);
-		nightConfig.set("_version", configBase.configVersion);
+		this.loadFromFile(this.nightConfig);
+		this.nightConfig.set("_version", this.configBase.configVersion);
 	}
 	/**
 	 * Loads the entire config from the file
@@ -184,24 +200,34 @@ public class ConfigFileHandling
 	// Save an entry when only given the entry
 	public void saveEntry(ConfigEntry<?> entry)
 	{
-		saveEntry(entry, nightConfig);
-		nightConfig.save();
+		this.saveEntry(entry, this.nightConfig);
+		this.nightConfig.save();
 	}
 	/** Save an entry */
 	public void saveEntry(ConfigEntry<?> entry, CommentedFileConfig workConfig)
 	{
-		if (!entry.getAppearance().showInFile) return;
-		if (entry.getTrueValue() == null)
-			throw new IllegalArgumentException("Entry [" + entry.getNameWCategory() + "] is null, this may be a problem with [" + configBase.modName + "]. Please contact the authors");
+		if (!entry.getAppearance().showInFile)
+		{
+			return;
+		}
+		else if ((entry.getRelevantSide() == EConfigEntryRelevantSide.CLIENT && MC_SHARED.isDedicatedServer())
+				|| (entry.getRelevantSide() == EConfigEntryRelevantSide.SERVER && !MC_SHARED.isDedicatedServer()))
+		{
+			// don't save server/client specific configs on the opposite
+			// (this keeps the config file clean of unnecessary items)
+			return;
+		}
+		else if (entry.getTrueValue() == null)
+		{
+			// TODO when can this happen?
+			throw new IllegalArgumentException("Entry [" + entry.getNameWCategory() + "] is null, this may be a problem with [" + this.configBase.modName + "]. Please contact the authors.");
+		}
 		
 		workConfig.set(entry.getNameWCategory(), ConfigTypeConverters.attemptToConvertToString(entry.getType(), entry.getTrueValue()));
 	}
 	
 	/** Loads an entry when only given the entry */
-	public void loadEntry(ConfigEntry<?> entry)
-	{
-		loadEntry(entry, nightConfig);
-	}
+	public void loadEntry(ConfigEntry<?> entry) { this.loadEntry(entry, this.nightConfig); }
 	/** Loads an entry */
 	@SuppressWarnings("unchecked")
 	public <T> void loadEntry(ConfigEntry<T> entry, CommentedFileConfig nightConfig)
@@ -211,7 +237,7 @@ public class ConfigFileHandling
 		
 		if (!nightConfig.contains(entry.getNameWCategory()))
 		{
-			saveEntry(entry, nightConfig);
+			this.saveEntry(entry, nightConfig);
 			return;
 		}
 		
@@ -230,7 +256,7 @@ public class ConfigFileHandling
 			Object convertedValue = ConfigTypeConverters.attemptToConvertFromString(expectedValueClass, value);
 			if (!convertedValue.getClass().equals(expectedValueClass))
 			{
-				LOGGER.error("Unable to convert config value ["+value+"] from ["+(value != null ? value.getClass() : "NULL")+"] to ["+expectedValueClass+"] for config ["+entry.name+"], " +
+				this.logger.error("Unable to convert config value ["+value+"] from ["+(value != null ? value.getClass() : "NULL")+"] to ["+expectedValueClass+"] for config ["+entry.name+"], " +
 						"the default config value will be used instead ["+entry.getDefaultValue()+"]. " +
 						"Make sure a converter is defined in ["+ConfigTypeConverters.class.getSimpleName()+"].");
 				convertedValue = entry.getDefaultValue();
@@ -239,31 +265,39 @@ public class ConfigFileHandling
 			
 			if (entry.getTrueValue() == null) 
 			{
-				LOGGER.warn("Entry [" + entry.getNameWCategory() + "] returned as null from the config. Using default value.");
+				this.logger.warn("Entry [" + entry.getNameWCategory() + "] returned as null from the config. Using default value.");
 				entry.pureSet(entry.getDefaultValue());
 			}
 		}
 		catch (Exception e)
 		{
 //                e.printStackTrace();
-			LOGGER.warn("Entry [" + entry.getNameWCategory() + "] had an invalid value when loading the config. Using default value.");
+			this.logger.warn("Entry [" + entry.getNameWCategory() + "] had an invalid value when loading the config. Using default value.");
 			entry.pureSet(entry.getDefaultValue());
 		}
 	}
 	
 	// Creates the comment for an entry when only given the entry
-	public void createComment(ConfigEntry<?> entry)
-	{
-		createComment(entry, nightConfig);
-	}
+	public void createComment(ConfigEntry<?> entry) { this.createComment(entry, this.nightConfig); }
 	// Creates a comment for an entry
 	public void createComment(ConfigEntry<?> entry, CommentedFileConfig nightConfig)
 	{
-		if (
-				!entry.getAppearance().showInFile || 
-				entry.getComment() == null
-		)
+		if (!entry.getAppearance().showInFile 
+			|| entry.getComment() == null)
+		{
 			return;
+		}
+		
+		
+		
+		if ((entry.getRelevantSide() == EConfigEntryRelevantSide.CLIENT && MC_SHARED.isDedicatedServer())
+				|| (entry.getRelevantSide() == EConfigEntryRelevantSide.SERVER && !MC_SHARED.isDedicatedServer()))
+		{
+			// don't save server/client specific configs on the opposite
+			// (this keeps the config file clean of unnecessary items)
+			return;
+		}
+		
 		
 		String comment = entry.getComment().replaceAll("\n", "\n ").trim();
 		// the new line makes it easier to read and separate configs
@@ -302,7 +336,7 @@ public class ConfigFileHandling
 			}
 			catch (Exception e)
 			{
-				LOGGER.warn("Loading file failed because of this expectation:\n" + e);
+				this.logger.warn("Loading file failed because of this expectation:\n" + e);
 				
 				reCreateFile(this.configPath);
 				
@@ -312,7 +346,7 @@ public class ConfigFileHandling
 		catch (Exception ex)
 		{
 			System.out.println("Creating file failed");
-			LOGGER.error(ex);
+			this.logger.error(ex);
 			SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Loading file and resetting config file failed at path [" + configPath + "]. Please check the file is ok and you have the permissions", ex);
 		}
 	}

core/src/main/java/com/seibel/distanthorizons/core/config/types/ConfigEntry.java

@@ -20,16 +20,23 @@
 package com.seibel.distanthorizons.core.config.types;
 
 
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBasedTable;
+import com.google.common.collect.HashBiMap;
+import com.google.common.collect.Table;
 import com.seibel.distanthorizons.core.config.NumberUtil;
 import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
 import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
 import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryAppearance;
 import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryPerformance;
+import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryRelevantSide;
 import com.seibel.distanthorizons.coreapi.interfaces.config.IConfigEntry;
 
-import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.*;
 import java.util.function.Consumer;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * Use for making the config variables
@@ -44,6 +51,10 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	private T min;
 	private T max;
 	private final ArrayList<IConfigListener> listenerList;
+	private final String serversideShortName;
+	
+	private final EConfigEntryPerformance performance;
+	private final EConfigEntryRelevantSide relevantSide;
 	
 	// API control //
 	/**
@@ -53,19 +64,25 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	public final boolean allowApiOverride;
 	private T apiValue;
 	
-	private final EConfigEntryPerformance performance;
 	
 	
 	/** Creates the entry */
-	private ConfigEntry(EConfigEntryAppearance appearance, T value, String comment, T min, T max, boolean allowApiOverride, EConfigEntryPerformance performance, ArrayList<IConfigListener> listenerList)
+	private ConfigEntry(
+			EConfigEntryAppearance appearance, 
+			T value, String comment, T min, T max, 
+			String serversideShortName, boolean allowApiOverride, 
+			EConfigEntryPerformance performance, EConfigEntryRelevantSide relevantSide, 
+			ArrayList<IConfigListener> listenerList)
 	{
 		super(appearance, value);
 		
 		this.comment = comment;
 		this.min = min;
 		this.max = max;
+		this.serversideShortName = serversideShortName;
 		this.allowApiOverride = allowApiOverride;
 		this.performance = performance;
+		this.relevantSide = relevantSide;
 		this.listenerList = listenerList;
 	}
 	
@@ -124,9 +141,9 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	@Override
 	public T get()
 	{
-		if (allowApiOverride && apiValue != null)
+		if (this.allowApiOverride && this.apiValue != null)
 		{
-			return apiValue;
+			return this.apiValue;
 		}
 		
 		return super.get();
@@ -175,10 +192,19 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	public void clampWithinRange(T min, T max)
 	{
 		byte validness = this.isValid(min, max);
-		if (validness == -1) this.value = (T) NumberUtil.getMinimum(this.value.getClass());
-		if (validness == 1) this.value = (T) NumberUtil.getMaximum(this.value.getClass());
+		if (validness == -1)
+		{
+			this.value = (T) NumberUtil.getMinimum(this.value.getClass());
+		}
+		if (validness == 1)
+		{
+			this.value = (T) NumberUtil.getMaximum(this.value.getClass());
+		}
 	}
 	
+	// TODO is this for command line use?
+	public String getServersideShortName() { return this.serversideShortName; }
+	
 	@Override
 	public String getComment() { return this.comment; }
 	@Override
@@ -186,9 +212,11 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	
 	/** Gets the performance impact of an option */
 	public EConfigEntryPerformance getPerformance() { return this.performance; }
+	/** Gets whether this config should apply to the client, server, or both */
+	public EConfigEntryRelevantSide getRelevantSide() { return this.relevantSide; }
 	
 	/** Fired whenever the config value changes to a new value. */
-	public void addValueChangeListener(Consumer<T> onValueChangeFunc)
+	@Override public void addValueChangeListener(Consumer<T> onValueChangeFunc)
 	{
 		ConfigChangeListener<T> changeListener = new ConfigChangeListener<>(this, onValueChangeFunc);
 		this.addListener(changeListener);
@@ -219,7 +247,7 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	 * <p> -1 == number too low
 	 */
 	@Override
-	public byte isValid() { return isValid(this.value, this.min, this.max); }
+	public byte isValid() { return this.isValid(this.value, this.min, this.max); }
 	/**
 	 * Checks if a new value is valid
 	 *
@@ -291,100 +319,162 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	}
 	
 	/** This should normally not be called since set() automatically calls this */
-	public void save() { configBase.configFileINSTANCE.saveEntry(this); }
+	public void save() { this.configBase.configFileINSTANCE.saveEntry(this); }
 	/** This should normally not be called except for special circumstances */
-	public void load() { configBase.configFileINSTANCE.loadEntry(this); }
+	public void load() { this.configBase.configFileINSTANCE.loadEntry(this); }
 	
 	
 	@Override
-	public boolean equals(IConfigEntry<?> obj) { return obj.getClass() == ConfigEntry.class && equals((ConfigEntry<?>) obj); }
+	public boolean equals(IConfigEntry<?> obj) { return obj.getClass() == ConfigEntry.class && this.equals((ConfigEntry<?>) obj); }
 	/** Is the value of this equal to another */
 	public boolean equals(ConfigEntry<?> obj)
 	{
 		// Can all of this just be "return this.value.equals(obj.value)"?
 		
 		if (Number.class.isAssignableFrom(this.value.getClass()))
+		{
 			return this.value == obj.value;
+		}
 		else
+		{
 			return this.value.equals(obj.value);
+		}
 	}
 	
-	
-	public static class Builder<T> extends AbstractConfigType.Builder<T, Builder<T>>
+	public static class Builder<TValue> extends AbstractConfigType.Builder<TValue, Builder<TValue>>
 	{
 		private String tmpComment = null;
-		private T tmpMin = null;
-		private T tmpMax = null;
+		private TValue tmpMin = null;
+		private TValue tmpMax = null;
+		protected String tmpServersideShortName = null;
 		private boolean tmpUseApiOverwrite = true;
 		private EConfigEntryPerformance tmpPerformance = EConfigEntryPerformance.DONT_SHOW;
+		private EConfigEntryRelevantSide tmpRelevantSide = EConfigEntryRelevantSide.CLIENT;
 		protected ArrayList<IConfigListener> tmpIConfigListener = new ArrayList<>();
 		
-		public Builder<T> comment(String newComment)
+		private Supplier<TValue> computedValueGetter;
+		private Consumer<TValue> computedValueSetter;
+		private boolean preventAutoApplyUntilExit;
+		
+		public Builder<TValue> comment(String newComment)
 		{
 			this.tmpComment = newComment;
 			return this;
 		}
 		
+		public Builder<TValue> computed(Supplier<TValue> computedValueGetter, Consumer<TValue> computedValueSetter)
+		{
+			this.computedValueGetter = computedValueGetter;
+			this.computedValueSetter = computedValueSetter;
+			this.setAppearance(EConfigEntryAppearance.ONLY_IN_GUI);
+			return this;
+		}
+		
+		public Builder<TValue> linkedTo(DeferredAccessor<TValue> otherConfigAccessor)
+		{
+			return this.computed(
+					otherConfigAccessor::get,
+					otherConfigAccessor::set
+			);
+		}
+		
+		public Builder<TValue> preset(PresetBuilder<TValue> presetBuilder)
+		{
+			return this.computed(
+					() -> {
+						List<TValue> values = presetBuilder.presetValues.entrySet().stream()
+								.map(entry -> entry.getValue().inverse().get(entry.getKey().get()))
+								.distinct().limit(2)
+								.collect(Collectors.toList());
+						
+						if (values.size() != 1)
+						{
+							return presetBuilder.customStateValue;
+						}
+						
+						return values.get(0);
+					},
+					value -> {
+						for (Map.Entry<DeferredAccessor<Object>, BiMap<TValue, Object>> entry : presetBuilder.presetValues.entrySet())
+						{
+							entry.getKey().set(entry.getValue().get(value));
+						}
+					}
+			);
+		}
+		
 		/** Allows most values to be set by 1 setter */
-		public Builder<T> setMinDefaultMax(T newMin, T newDefault, T newMax)
+		public Builder<TValue> setMinDefaultMax(TValue newMin, TValue newDefault, TValue newMax)
 		{
 			this.set(newDefault);
 			this.setMinMax(newMin, newMax);
 			return this;
 		}
 		
-		public Builder<T> setMinMax(T newMin, T newMax)
+		public Builder<TValue> setMinMax(TValue newMin, TValue newMax)
 		{
 			this.tmpMin = newMin;
 			this.tmpMax = newMax;
 			return this;
 		}
 		
-		public Builder<T> setMin(T newMin)
+		public Builder<TValue> setMin(TValue newMin)
 		{
 			this.tmpMin = newMin;
 			return this;
 		}
 		
-		public Builder<T> setMax(T newMax)
+		public Builder<TValue> setMax(TValue newMax)
 		{
 			this.tmpMax = newMax;
 			return this;
 		}
 		
-		public Builder<T> setUseApiOverwrite(boolean newUseApiOverwrite)
+		public Builder<TValue> setServersideShortName(String name)
+		{
+			this.tmpServersideShortName = name;
+			return this;
+		}
+		
+		public Builder<TValue> setUseApiOverwrite(boolean newUseApiOverwrite)
 		{
 			this.tmpUseApiOverwrite = newUseApiOverwrite;
 			return this;
 		}
 		
-		public Builder<T> setPerformance(EConfigEntryPerformance newPerformance)
+		public Builder<TValue> setPerformance(EConfigEntryPerformance newPerformance)
 		{
 			this.tmpPerformance = newPerformance;
 			return this;
 		}
 		
+		public Builder<TValue> setSide(EConfigEntryRelevantSide relevantSide)
+		{
+			this.tmpRelevantSide = relevantSide;
+			return this;
+		}
 		
 		
-		public Builder<T> replaceListeners(ArrayList<IConfigListener> newConfigListener)
+		
+		public Builder<TValue> replaceListeners(ArrayList<IConfigListener> newConfigListener)
 		{
 			this.tmpIConfigListener = newConfigListener;
 			return this;
 		}
 		
-		public Builder<T> addListeners(IConfigListener... newConfigListener)
+		public Builder<TValue> addListeners(IConfigListener... newConfigListener)
 		{
 			this.tmpIConfigListener.addAll(Arrays.asList(newConfigListener));
 			return this;
 		}
 		
-		public Builder<T> addListener(IConfigListener newConfigListener)
+		public Builder<TValue> addListener(IConfigListener newConfigListener)
 		{
 			this.tmpIConfigListener.add(newConfigListener);
 			return this;
 		}
 		
-		public Builder<T> clearListeners()
+		public Builder<TValue> clearListeners()
 		{
 			this.tmpIConfigListener.clear();
 			return this;
@@ -392,9 +482,55 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 		
 		
 		
-		public ConfigEntry<T> build()
+		public ConfigEntry<TValue> build()
 		{
-			return new ConfigEntry<>(this.tmpAppearance, this.tmpValue, this.tmpComment, this.tmpMin, this.tmpMax, this.tmpUseApiOverwrite, this.tmpPerformance, this.tmpIConfigListener);
+			return new ConfigEntry<>(
+					this.tmpAppearance, 
+					this.tmpValue, this.tmpComment, this.tmpMin, this.tmpMax, 
+					this.tmpServersideShortName, this.tmpUseApiOverwrite, 
+					this.tmpPerformance, this.tmpRelevantSide, this.tmpIConfigListener);
+		}
+		
+	}
+	
+	/**
+	 * Wraps deferred accesses to a ConfigEntry. <br>
+	 * It replaces the direct uses of ConfigEntry in places where Java runtime should not attempt
+	 * to dereference path to said entry, until initialization is done.
+	 */
+	@FunctionalInterface
+	public interface DeferredAccessor<T>
+	{
+		ConfigEntry<T> getEntry();
+		
+		default T get() { return this.getEntry().get(); }
+		default void set(T value) { this.getEntry().set(value); }
+		
+	}
+	
+	public static class PresetBuilder<TValue>
+	{
+		public final TValue customStateValue;
+		public final Map<DeferredAccessor<Object>, BiMap<TValue, Object>> presetValues = new HashMap<>();
+		
+		public PresetBuilder(TValue customStateValue)
+		{
+			this.customStateValue = customStateValue;
+		}
+		
+		@SuppressWarnings("unchecked")
+		public <TControlledEntryValue> PresetBuilder<TValue> addConfigEntry(
+				DeferredAccessor<TControlledEntryValue> controlledEntrySupplier,
+				Consumer<Map<TValue, TControlledEntryValue>> presetValueInitializer
+		)
+		{
+			presetValueInitializer.accept(
+					(Map<TValue, TControlledEntryValue>) this.presetValues.computeIfAbsent(
+							(DeferredAccessor<Object>) controlledEntrySupplier,
+							ignored -> HashBiMap.create()
+					)
+			);
+			return this;
 		}
 		
 	}

core/src/main/java/com/seibel/distanthorizons/core/config/types/ConfigLinkedEntry.java

@@ -1,63 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.config.types;
-
-import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryAppearance;
-
-/**
- * Creates a UI element that copies everything from another element.
- * This only effects the UI
- *
- * @author coolGi
- */
-@Deprecated // FIXME doesn't work with localization
-public class ConfigLinkedEntry extends AbstractConfigType<AbstractConfigType<?, ?>, ConfigLinkedEntry>
-{
-	public ConfigLinkedEntry(AbstractConfigType<?, ?> value)
-	{
-		super(EConfigEntryAppearance.ONLY_IN_GUI, value);
-	}
-	
-	/** Appearance shouldn't be changed */
-	@Override
-	public void setAppearance(EConfigEntryAppearance newAppearance) { }
-	
-	/** Value shouldn't be changed after creation */
-	@Override
-	public void set(AbstractConfigType<?, ?> newValue) { }
-	
-	
-	public static class Builder extends AbstractConfigType.Builder<AbstractConfigType<?, ?>, Builder>
-	{
-		/** Appearance shouldn't be changed */
-		@Override
-		public Builder setAppearance(EConfigEntryAppearance newAppearance)
-		{
-			return this;
-		}
-		
-		public ConfigLinkedEntry build()
-		{
-			return new ConfigLinkedEntry(this.tmpValue);
-		}
-		
-	}
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/config/types/enums/EConfigEntryRelevantSide.java

@@ -17,14 +17,20 @@
  *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package com.seibel.distanthorizons.core.network.protocol;
+package com.seibel.distanthorizons.core.config.types.enums;
 
 /**
- * CLIENT, <br>
- * SERVER, <br>
+ * BOTH,    <br>
+ * SERVER,  <br>
+ * CLIENT,  <br>
+ * 
+ * Defines whether this config entry is for the client, server, or both.
+ * TODO this needs a better name.
  */
-public enum EMessageHandlerSide
+public enum EConfigEntryRelevantSide
 {
+	BOTH,
+	SERVER,
 	CLIENT,
-	SERVER
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/fullData/sources/FullDataSourceV2.java

@@ -90,12 +90,14 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 	
 	/** 
 	 * stores how far each column has been generated should start with {@link EDhApiWorldGenerationStep#EMPTY}
-	 * @see EDhApiWorldGenerationStep 
+	 *
+	 * @see EDhApiWorldGenerationStep
 	 */
 	public byte[] columnGenerationSteps;
 	/** 
 	 * stores what world compression was used for each column.
-	 * @see EDhApiWorldCompressionMode 
+	 *
+	 * @see EDhApiWorldCompressionMode
 	 */
 	public byte[] columnWorldCompressionMode;
 	
@@ -144,7 +146,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 		this.columnWorldCompressionMode = columnWorldCompressionMode;
 	}
 	
-	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper) { return LodDataBuilder.createGeneratedDataSource(chunkWrapper); }
+	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper) { return LodDataBuilder.createFromChunk(chunkWrapper); }
 	
 	public static FullDataSourceV2 createFromLegacyDataSourceV1(FullDataSourceV1 legacyData)
 	{
@@ -180,7 +182,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 						
 						boolean isAir = legacyData.mapping.getBlockStateWrapper(FullDataPointUtil.getId(dataPoint)).isAir();
 						byte blockLight = (byte) FullDataPointUtil.getBlockLight(dataPoint);
-
+						
 						if (isAir)
 						{
 							// air shouldn't have any light, otherwise down sampling will look weird
@@ -379,7 +381,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 		for (int x = 0; x < WIDTH; x += 2)
 		{
 			for (int z = 0; z < WIDTH; z += 2)
-			{			
+			{
 				int recipientX = (x / 2) + recipientOffsetX;
 				int recipientZ = (z / 2) + recipientOffsetZ;
 				int recipientIndex = relativePosToIndex(recipientX, recipientZ);
@@ -612,7 +614,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 			int id = determineMostValueInColumnSlice(mergeIds, inputDataSource.mapping);
 			byte blockLight = (byte) determineAverageValueInColumnSlice(mergeBlockLights);
 			byte skyLight = (byte) determineAverageValueInColumnSlice(mergeSkyLights);
-
+			
 			// if this slice is different then the last one, create a new one
 			if (id != lastId
 				// block and sky light might not be necessary
@@ -698,7 +700,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 		{
 			LodUtil.assertTrue(sliceArray.length == 4, "Column Slice should only contain 4 values.");
 		}
-			
+		
 		int value0 = sliceArray[0];
 		int count0 = 0;
 		int value1 = sliceArray[1];
@@ -719,26 +721,42 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 			}
 			
 			if (value == value0)
+			{
 				count0++;
+			}
 			else if (value == value1)
+			{
 				count1++;
+			}
 			else if (value == value2)
+			{
 				count2++;
+			}
 			else
+			{
 				count3++;
+			}
 		}
 		
 		// return the most common occurance
 		int maxCount = Math.max(count0, Math.max(count1, Math.max(count2, count3)));
 		if (maxCount == count0)
-			// if the max count is 1 then we'll just go with the first column
+		// if the max count is 1 then we'll just go with the first column
+		{
 			return value0;
+		}
 		else if (maxCount == count1)
+		{
 			return value1;
+		}
 		else if (maxCount == count2)
+		{
 			return value2;
-		else 
+		}
+		else
+		{
 			return value3;
+		}
 	}
 	private static int determineAverageValueInColumnSlice(int[] sliceArray)
 	{
@@ -876,8 +894,8 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 	{
 		int index = relativePosToIndex(relX, relZ);
 		this.dataPoints[index] = longArray;
-		this.columnGenerationSteps[index] =  worldGenStep.value;
-		this.columnWorldCompressionMode[index] =  worldCompressionMode.value;
+		this.columnGenerationSteps[index] = worldGenStep.value;
+		this.columnWorldCompressionMode[index] = worldCompressionMode.value;
 		
 		
 		if (RUN_UPDATE_DEV_VALIDATION)
@@ -942,7 +960,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 			// the positions are the same, use the hash as a quick method
 			// to determine if the data inside is the same.
 			// Note: this isn't perfect, but should work well enough for our use case.
-			return other.hashCode() == this.hashCode();	
+			return other.hashCode() == this.hashCode();
 		}
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/ColumnRenderSource.java

@@ -25,7 +25,7 @@ import com.seibel.distanthorizons.core.dataObjects.transformers.FullDataToRender
 import com.seibel.distanthorizons.core.file.DataSourcePool;
 import com.seibel.distanthorizons.core.file.IDataSource;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.core.dataObjects.render.columnViews.ColumnArrayView;

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/BufferQuad.java

@@ -67,9 +67,13 @@ public final class BufferQuad
 			EDhDirection direction)
 	{
 		if (widthEastWest == 0 || widthNorthSouthOrUpDown == 0)
+		{
 			throw new IllegalArgumentException("Size 0 quad!");
+		}
 		if (widthEastWest < 0 || widthNorthSouthOrUpDown < 0)
+		{
 			throw new IllegalArgumentException("Negative sized quad!");
+		}
 		
 		this.x = x;
 		this.y = y;
@@ -95,7 +99,9 @@ public final class BufferQuad
 	public int compare(BufferQuad quad, BufferMergeDirectionEnum compareDirection)
 	{
 		if (this.direction != quad.direction)
+		{
 			throw new IllegalArgumentException("The other quad is not in the same direction: " + quad.direction + " vs " + this.direction);
+		}
 		
 		if (compareDirection == BufferMergeDirectionEnum.EastWest)
 		{
@@ -150,11 +156,15 @@ public final class BufferQuad
 	public boolean tryMerge(BufferQuad quad, BufferMergeDirectionEnum mergeDirection)
 	{
 		if (quad.hasError || this.hasError)
+		{
 			return false;
+		}
 		
 		// only merge quads that are in the same direction
 		if (this.direction != quad.direction)
+		{
 			return false;
+		}
 		
 		// make sure these quads share the same perpendicular axis
 		if ((mergeDirection == BufferMergeDirectionEnum.EastWest && this.y != quad.y) ||

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/ColumnRenderBuffer.java

@@ -21,10 +21,9 @@ package com.seibel.distanthorizons.core.dataObjects.render.bufferBuilding;
 
 import com.seibel.distanthorizons.api.DhApi;
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
-import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.render.glObject.GLProxy;
 import com.seibel.distanthorizons.core.render.glObject.buffer.GLVertexBuffer;
 import com.seibel.distanthorizons.core.render.renderer.LodRenderer;

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/ColumnRenderBufferBuilder.java

@@ -27,7 +27,7 @@ import com.seibel.distanthorizons.core.dataObjects.render.ColumnRenderSource;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.glObject.GLProxy;
 import com.seibel.distanthorizons.core.util.ColorUtil;
@@ -111,7 +111,7 @@ public class ColumnRenderBufferBuilder
 	/** @link adjData should be null for adjacent sections that cross detail level boundaries */
 	public static CompletableFuture<ColumnRenderBuffer> uploadBuffersAsync(
 			IDhClientLevel clientLevel,
-			ColumnRenderSource renderSource,
+			long pos,
 			LodQuadBuilder quadBuilder
 		)
 	{
@@ -132,7 +132,7 @@ public class ColumnRenderBufferBuilder
 				{
 					try
 					{
-						ColumnRenderBuffer buffer = new ColumnRenderBuffer(new DhBlockPos(DhSectionPos.getMinCornerBlockX(renderSource.pos), clientLevel.getMinY(), DhSectionPos.getMinCornerBlockZ(renderSource.pos)));
+						ColumnRenderBuffer buffer = new ColumnRenderBuffer(new DhBlockPos(DhSectionPos.getMinCornerBlockX(pos), clientLevel.getMinY(), DhSectionPos.getMinCornerBlockZ(pos)));
 						try
 						{
 							buffer.uploadBuffer(quadBuilder, GLProxy.getInstance().getGpuUploadMethod());
@@ -158,7 +158,7 @@ public class ColumnRenderBufferBuilder
 					}
 					catch (Throwable e3)
 					{
-						LOGGER.error("LodNodeBufferBuilder was unable to upload buffer for pos ["+DhSectionPos.toString(renderSource.pos)+"], error: [" + e3.getMessage() + "].", e3);
+						LOGGER.error("LodNodeBufferBuilder was unable to upload buffer for pos ["+DhSectionPos.toString(pos)+"], error: [" + e3.getMessage() + "].", e3);
 						throw e3;
 					}
 				}, bufferUploaderExecutor);

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/LodQuadBuilder.java

@@ -191,14 +191,14 @@ public class LodQuadBuilder
 	public void addQuadDown(short x, short y, short z, short width, short wz, int color, byte irisBlockMaterialId, byte skylight, byte blocklight)
 	{
 		BufferQuad quad = new BufferQuad(x, y, z, width, wz, color, irisBlockMaterialId, skylight, blocklight, EDhDirection.DOWN);
-		ArrayList<BufferQuad> qs = (doTransparency && ColorUtil.getAlpha(color) < 255)
-				? transparentQuads[EDhDirection.DOWN.ordinal()] : opaqueQuads[EDhDirection.DOWN.ordinal()];
+		ArrayList<BufferQuad> qs = (this.doTransparency && ColorUtil.getAlpha(color) < 255)
+				? this.transparentQuads[EDhDirection.DOWN.ordinal()] : this.opaqueQuads[EDhDirection.DOWN.ordinal()];
 		if (!qs.isEmpty()
 				&& (qs.get(qs.size() - 1).tryMerge(quad, BufferMergeDirectionEnum.EastWest)
 						|| qs.get(qs.size() - 1).tryMerge(quad, BufferMergeDirectionEnum.NorthSouthOrUpDown))
 			)
 		{
-			premergeCount++;
+			this.premergeCount++;
 			return;
 		}
 		qs.add(quad);
@@ -251,7 +251,9 @@ public class LodQuadBuilder
 	private static long mergeQuadsInternal(ArrayList<BufferQuad>[] list, int directionIndex, BufferMergeDirectionEnum mergeDirection)
 	{
 		if (list[directionIndex].size() <= 1)
+		{
 			return 0;
+		}
 		
 		list[directionIndex].sort((objOne, objTwo) -> objOne.compare(objTwo, mergeDirection));
 		
@@ -423,9 +425,18 @@ public class LodQuadBuilder
 		// 0b01 = positive offset
 		// 0b11 = negative offset
 		// format is: 0b00zzyyxx
-		if (mx != 0) mirco |= mx > 0 ? 0b01 : 0b11;
-		if (my != 0) mirco |= my > 0 ? 0b0100 : 0b1100;
-		if (mz != 0) mirco |= mz > 0 ? 0b010000 : 0b110000;
+		if (mx != 0)
+		{
+			mirco |= mx > 0 ? 0b01 : 0b11;
+		}
+		if (my != 0)
+		{
+			mirco |= my > 0 ? 0b0100 : 0b1100;
+		}
+		if (mz != 0)
+		{
+			mirco |= mz > 0 ? 0b010000 : 0b110000;
+		}
 		meta |= mirco << 8;
 		
 		bb.putShort(meta);

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/transformers/FullDataToRenderDataTransformer.java

@@ -28,7 +28,7 @@ import com.seibel.distanthorizons.core.dataObjects.render.columnViews.ColumnArra
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.util.ColorUtil;
 import com.seibel.distanthorizons.core.util.FullDataPointUtil;
@@ -229,7 +229,7 @@ public class FullDataToRenderDataTransformer
 				if (!brokenPos.contains(fullDataMapping.getPos()))
 				{
 					brokenPos.add(fullDataMapping.getPos());
-					String dimName = level.getLevelWrapper().getDimensionType().getDimensionName();
+					String dimName = level.getLevelWrapper().getDimensionName();
 					LOGGER.warn("Unable to get data point with id ["+id+"] " +
 							"(Max possible ID: ["+fullDataMapping.getMaxValidId()+"]) " +
 							"for pos ["+fullDataMapping.getPos()+"] in dimension ["+dimName+"]. " +

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/transformers/LodDataBuilder.java

@@ -31,7 +31,8 @@ import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSour
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPosMutable;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.util.FullDataPointUtil;
 import com.seibel.distanthorizons.core.util.LodUtil;
@@ -39,6 +40,7 @@ import com.seibel.distanthorizons.core.util.RenderDataPointUtil;
 import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IMutableBlockPosWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
@@ -57,17 +59,15 @@ public class LodDataBuilder
 	// converters //
 	//============//
 	
-	public static FullDataSourceV2 createGeneratedDataSource(IChunkWrapper chunkWrapper)
+	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper)
 	{
-		if (!canGenerateLodFromChunk(chunkWrapper))
-		{
-			return null;
-		}
+		// only block lighting is needed here, sky lighting is populated at the data source stage
+		LodUtil.assertTrue(chunkWrapper.isDhBlockLightingCorrect());
 		
 		
 		
-		int sectionPosX = getXOrZSectionPosFromChunkPos(chunkWrapper.getChunkPos().x);
-		int sectionPosZ = getXOrZSectionPosFromChunkPos(chunkWrapper.getChunkPos().z);
+		int sectionPosX = getXOrZSectionPosFromChunkPos(chunkWrapper.getChunkPos().getX());
+		int sectionPosZ = getXOrZSectionPosFromChunkPos(chunkWrapper.getChunkPos().getZ());
 		long pos = DhSectionPos.encode(DhSectionPos.SECTION_BLOCK_DETAIL_LEVEL, sectionPosX, sectionPosZ);
 		
 		FullDataSourceV2 dataSource = FullDataSourceV2.createEmpty(pos);
@@ -77,8 +77,8 @@ public class LodDataBuilder
 		
 		// compute the chunk dataSource offset
 		// this offset is used to determine where in the dataSource this chunk's data should go
-		int chunkOffsetX = chunkWrapper.getChunkPos().x;
-		if (chunkWrapper.getChunkPos().x < 0)
+		int chunkOffsetX = chunkWrapper.getChunkPos().getX();
+		if (chunkWrapper.getChunkPos().getX() < 0)
 		{
 			// expected offset positions:
 			// chunkPos -> offset
@@ -105,8 +105,8 @@ public class LodDataBuilder
 		}
 		chunkOffsetX *= LodUtil.CHUNK_WIDTH;
 		
-		int chunkOffsetZ = chunkWrapper.getChunkPos().z;
-		if (chunkWrapper.getChunkPos().z < 0)
+		int chunkOffsetZ = chunkWrapper.getChunkPos().getZ();
+		if (chunkWrapper.getChunkPos().getZ() < 0)
 		{
 			chunkOffsetZ = ((chunkOffsetZ) % FullDataSourceV2.NUMB_OF_CHUNKS_WIDE);
 			if (chunkOffsetZ != 0)
@@ -131,6 +131,9 @@ public class LodDataBuilder
 		
 		try
 		{
+			IMutableBlockPosWrapper mcBlockPos = chunkWrapper.getMutableBlockPosWrapper();
+			IBlockStateWrapper previousBlockState = null;
+			
 			int minBuildHeight = chunkWrapper.getMinNonEmptyHeight();
 			for (int relBlockX = 0; relBlockX < LodUtil.CHUNK_WIDTH; relBlockX++)
 			{
@@ -148,8 +151,8 @@ public class LodDataBuilder
 					if (lastY < chunkWrapper.getMaxBuildHeight())
 					{
 						// FIXME: The lastY +1 offset is to reproduce the old behavior. Remove this when we get per-face lighting
-						blockLight = (byte) chunkWrapper.getBlockLight(relBlockX, lastY + 1, relBlockZ);
-						skyLight = (byte) chunkWrapper.getSkyLight(relBlockX, lastY + 1, relBlockZ);
+						blockLight = (byte) chunkWrapper.getDhBlockLight(relBlockX, lastY + 1, relBlockZ);
+						skyLight = (byte) chunkWrapper.getDhSkyLight(relBlockX, lastY + 1, relBlockZ);
 					}
 					else
 					{
@@ -162,7 +165,7 @@ public class LodDataBuilder
 					// determine the starting Y Pos
 					int y = chunkWrapper.getLightBlockingHeightMapValue(relBlockX, relBlockZ);
 					// go up until we reach open air or the world limit
-					IBlockStateWrapper topBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
+					IBlockStateWrapper topBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
 					while (!topBlockState.isAir() && y < chunkWrapper.getMaxBuildHeight())
 					{
 						try
@@ -170,7 +173,7 @@ public class LodDataBuilder
 							// This is necessary in some edge cases with snow layers and some other blocks that may not appear in the height map but do block light.
 							// Interestingly this doesn't appear to be the case in the DhLightingEngine, if this same logic is added there the lighting breaks for the affected blocks.
 							y++;
-							topBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
+							topBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
 						}
 						catch (Exception e)
 						{
@@ -189,9 +192,9 @@ public class LodDataBuilder
 					for (; y >= minBuildHeight; y--)
 					{
 						IBiomeWrapper newBiome = chunkWrapper.getBiome(relBlockX, y, relBlockZ);
-						IBlockStateWrapper newBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
-						byte newBlockLight = (byte) chunkWrapper.getBlockLight(relBlockX, y + 1, relBlockZ);
-						byte newSkyLight = (byte) chunkWrapper.getSkyLight(relBlockX, y + 1, relBlockZ);
+						IBlockStateWrapper newBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
+						byte newBlockLight = (byte) chunkWrapper.getDhBlockLight(relBlockX, y + 1, relBlockZ);
+						byte newSkyLight = (byte) chunkWrapper.getDhSkyLight(relBlockX, y + 1, relBlockZ);
 						
 						// save the biome/block change
 						if (!newBiome.equals(biome) || !newBlockState.equals(blockState))
@@ -237,7 +240,7 @@ public class LodDataBuilder
 	private static boolean blockVisible(IChunkWrapper chunkWrapper, int relBlockX, int blockY, int relBlockZ)
 	{
 		DhBlockPos originalBlockPos = new DhBlockPos(relBlockX,blockY,relBlockZ);
-		DhBlockPos testBlockPos = new DhBlockPos(relBlockX,blockY,relBlockZ);
+		final DhBlockPosMutable testBlockPos = new DhBlockPosMutable(relBlockX,blockY,relBlockZ);
 		
 		// up/down
 		if (blockInDirectionVisible(chunkWrapper, EDhDirection.UP, originalBlockPos, testBlockPos))
@@ -272,20 +275,20 @@ public class LodDataBuilder
 		
 		return false;
 	}
-	private static boolean blockInDirectionVisible(IChunkWrapper chunkWrapper, EDhDirection direction, DhBlockPos originalBlockPos, DhBlockPos testBlockPos)
+	private static boolean blockInDirectionVisible(IChunkWrapper chunkWrapper, EDhDirection direction, DhBlockPos originalBlockPos, DhBlockPosMutable testBlockPos)
 	{
 		originalBlockPos.mutateOffset(direction, testBlockPos);
 		
 		// if the block is next to the border of a chunk, assume it's visible
-		if (testBlockPos.x < 0 || testBlockPos.x >= LodUtil.CHUNK_WIDTH)
+		if (testBlockPos.getX() < 0 || testBlockPos.getX() >= LodUtil.CHUNK_WIDTH)
 		{
 			return true;
 		}
-		if (testBlockPos.z < 0 || testBlockPos.z >= LodUtil.CHUNK_WIDTH)
+		if (testBlockPos.getZ() < 0 || testBlockPos.getZ() >= LodUtil.CHUNK_WIDTH)
 		{
 			return true;
 		}
-		if (testBlockPos.y < chunkWrapper.getMinBuildHeight() || testBlockPos.y > chunkWrapper.getMaxBuildHeight())
+		if (testBlockPos.getY() < chunkWrapper.getMinBuildHeight() || testBlockPos.getY() > chunkWrapper.getMaxBuildHeight())
 		{
 			return true;
 		}
@@ -434,8 +437,6 @@ public class LodDataBuilder
 	// helper methods //
 	//================//
 	
-	public static boolean canGenerateLodFromChunk(IChunkWrapper chunk) { return chunk != null && chunk.isLightCorrect(); }
-	
 	public static int getXOrZSectionPosFromChunkPos(int chunkXOrZPos)
 	{
 		// get the section position

core/src/main/java/com/seibel/distanthorizons/core/file/AbstractDataSourceHandler.java

@@ -46,7 +46,7 @@ public abstract class AbstractDataSourceHandler
 	 * The lowest numerical detail level possible. 
 	 *
 	 * @see AbstractDataSourceHandler#TOP_SECTION_DETAIL_LEVEL
-	 * */
+	 */
 	public static final byte MIN_SECTION_DETAIL_LEVEL = DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL;
 	
 	
@@ -223,7 +223,8 @@ public abstract class AbstractDataSourceHandler
 	
 	/** 
 	 * After this method returns the inputData will be written to file.
-	 * @param updatePos the position to update 
+	 *
+	 * @param updatePos the position to update
 	 */
 	protected void updateDataSourceAtPos(long updatePos, @NotNull FullDataSourceV2 inputData, boolean lockOnUpdatePos)
 	{

core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/FullDataSourceProviderV2.java

@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.file.fullDatafile;
 
 import com.seibel.distanthorizons.api.enums.config.EDhApiDataCompressionMode;
 import com.seibel.distanthorizons.core.api.internal.ClientApi;
+import com.seibel.distanthorizons.core.api.internal.SharedApi;
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV1;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
@@ -37,6 +38,7 @@ import com.seibel.distanthorizons.core.sql.repo.FullDataSourceV2Repo;
 import com.seibel.distanthorizons.core.util.ThreadUtil;
 import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.world.EWorldEnvironment;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;
@@ -45,11 +47,14 @@ import org.jetbrains.annotations.Nullable;
 import java.awt.*;
 import java.io.File;
 import java.io.IOException;
+import java.sql.PreparedStatement;
 import java.sql.SQLException;
 import java.util.*;
+import java.util.List;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.locks.ReentrantLock;
+import java.util.stream.Collectors;
 
 /**
  * Handles reading/writing {@link FullDataSourceV2} 
@@ -102,9 +107,14 @@ public class FullDataSourceProviderV2
 	
 	// TODO only run thread if modifications happened recently
 	/** 
-	 * This isn't in {@link AbstractDataSourceHandler} since we don't need parent updating logic
-	 * for render data, only full data.
+	 * This isn't in {@link AbstractDataSourceHandler} since we only want to update
+	 * the newest version of the full data, so if we have providers for either
+	 * render data or old full data, we don't want to update them. <br><br>
+	 * 
+	 * Will be null on the dedicated server since updates don't need to be propagated,
+	 * only the highest detail level is needed.
 	 */
+	@Nullable
 	private final ThreadPoolExecutor updateQueueProcessor;
 	
 	
@@ -121,14 +131,22 @@ public class FullDataSourceProviderV2
 		
 		DebugRenderer.register(this, Config.Client.Advanced.Debugging.DebugWireframe.showFullDataUpdateStatus);
 		
-		String dimensionName = level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimensionName = level.getLevelWrapper().getDimensionName();
 		
 		// start migrating any legacy data sources present in the background
-		this.migrationThreadPool = ThreadUtil.makeRateLimitedThreadPool(1, MIGRATION_THREAD_NAME_PREFIX +"["+dimensionName+"]", Config.Client.Advanced.MultiThreading.runTimeRatioForUpdatePropagatorThreads.get(), Thread.MIN_PRIORITY, (Semaphore)null);
-		this.migrationThreadPool.execute(() -> this.convertLegacyDataSources());
+		this.migrationThreadPool = ThreadUtil.makeRateLimitedThreadPool(1, MIGRATION_THREAD_NAME_PREFIX + "["+dimensionName+"]", Config.Client.Advanced.MultiThreading.runTimeRatioForUpdatePropagatorThreads.get(), Thread.MIN_PRIORITY, (Semaphore) null);
+		this.migrationThreadPool.execute(this::convertLegacyDataSources);
 		
-		this.updateQueueProcessor = ThreadUtil.makeSingleThreadPool("Parent Update Queue ["+dimensionName+"]");
-		this.updateQueueProcessor.execute(() -> this.runUpdateQueue());
+		// update propagation doesn't need to be run on the server since only the highest detail level is needed
+		if (SharedApi.getEnvironment() != EWorldEnvironment.Server_Only)
+		{
+			this.updateQueueProcessor = ThreadUtil.makeSingleThreadPool("Parent Update Queue ["+dimensionName+"]");
+			this.updateQueueProcessor.execute(this::runUpdateQueue);
+		}
+		else
+		{
+			this.updateQueueProcessor = null;
+		}
 	}
 	
 	
@@ -289,7 +307,8 @@ public class FullDataSourceProviderV2
 								}
 							});
 						}
-						catch (RejectedExecutionException ignore) { /* the executor was shut down, it should be back up shortly and able to accept new jobs */ }
+						catch (RejectedExecutionException ignore)
+						{ /* the executor was shut down, it should be back up shortly and able to accept new jobs */ }
 						catch (Exception e)
 						{
 							this.parentUpdatingPosSet.remove(parentUpdatePos);
@@ -299,7 +318,10 @@ public class FullDataSourceProviderV2
 				}
 				
 			}
-			catch (InterruptedException ignored) { Thread.currentThread().interrupt(); }
+			catch (InterruptedException ignored)
+			{
+				Thread.currentThread().interrupt();
+			}
 			catch (Exception e)
 			{
 				LOGGER.error("Unexpected error in the parent update queue thread. Error: " + e.getMessage(), e);
@@ -317,7 +339,7 @@ public class FullDataSourceProviderV2
 	
 	private void convertLegacyDataSources()
 	{
-		String dimensionName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimensionName = this.level.getLevelWrapper().getDimensionName();
 		LOGGER.info("Attempting to migrate data sources for: ["+dimensionName+"]-["+this.saveDir+"]...");
 		
 		
@@ -339,7 +361,7 @@ public class FullDataSourceProviderV2
 			
 			LOGGER.info("deleting [" + dimensionName + "] - ["+totalDeleteCount+"] unused data sources...");
 			this.legacyDeletionCount = totalDeleteCount;
-
+			
 			ArrayList<String> unusedDataPosList = this.legacyFileHandler.repo.getUnusedDataSourcePositionStringList(50);
 			while (unusedDataPosList.size() != 0)
 			{
@@ -368,8 +390,8 @@ public class FullDataSourceProviderV2
 				}
 				catch (InterruptedException ignore){}
 			}
-
 			LOGGER.info("Done deleting [" + dimensionName + "] - ["+totalDeleteCount+"] unused data sources.");
+			
 		}
 		
 		
@@ -420,9 +442,7 @@ public class FullDataSourceProviderV2
 								{
 									newDataSource.close();
 								}
-								catch (Exception ignore)
-								{
-								}
+								catch (Exception ignore) { }
 							});
 						}
 						catch (Exception e)
@@ -498,7 +518,7 @@ public class FullDataSourceProviderV2
 		}
 		this.migrationStartMessageQueued = true;
 		
-		String dimName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimName = this.level.getLevelWrapper().getDimensionName();
 		ClientApi.INSTANCE.showChatMessageNextFrame(
 				"Old Distant Horizons data is being migrated for ["+dimName+"]. \n" +
 				"While migrating LODs may load slowly \n" +
@@ -509,7 +529,7 @@ public class FullDataSourceProviderV2
 	
 	private void showMigrationEndMessage(boolean success)
 	{
-		String dimName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimName = this.level.getLevelWrapper().getDimensionName();
 		
 		if (success)
 		{
@@ -553,8 +573,8 @@ public class FullDataSourceProviderV2
 	 *      return false; <br>
 	 * } <br>
 	 * </code>
-	 *  to the beginning of your override.
-	 *  Otherwise, parent retrieval limits will be ignored.
+	 * to the beginning of your override.
+	 * Otherwise, parent retrieval limits will be ignored.
 	 */
 	public boolean canQueueRetrieval()
 	{
@@ -569,13 +589,13 @@ public class FullDataSourceProviderV2
 	 * an empty array if all positions were generated 
 	 */
 	@Nullable
-	public LongArrayList getPositionsToRetrieve(Long pos)  { return null; }
+	public LongArrayList getPositionsToRetrieve(Long pos) { return null; }
 	/**
 	 * Returns how many positions could potentially be generated for this position assuming the position is empty.
 	 * Used when estimating the total number of retrieval requests.
 	 */
-	public int getMaxPossibleRetrievalPositionCountForPos(Long pos)  { return -1; }
-
+	public int getMaxPossibleRetrievalPositionCountForPos(Long pos) { return -1; }
+	
 	/** @return true if the position was queued, false if not */
 	public boolean queuePositionForRetrieval(Long genPos) { return false; }
 	
@@ -585,7 +605,7 @@ public class FullDataSourceProviderV2
 	public void clearRetrievalQueue() { }
 	
 	/** Can be used to display how many total retrieval requests might be available. */
-	public void setTotalRetrievalPositionCount(int newCount) {  }
+	public void setTotalRetrievalPositionCount(int newCount) { }
 	
 	/** 
 	 * Returns how many data sources are currently in memory and haven't
@@ -594,6 +614,20 @@ public class FullDataSourceProviderV2
 	 */
 	public int getUnsavedDataSourceCount() { return -1; }
 	
+	public boolean fileExists(long pos) { return this.repo.getDataSizeInBytes(pos) > 0; }
+	
+	
+	
+	//========================//
+	// multiplayer networking //
+	//========================//
+	
+	@Nullable
+	public Long getTimestampForPos(long pos)
+	{ return this.repo.getTimestampForPos(pos); }
+	public Map<Long, Long> getTimestampsForRange(byte detailLevel, int startPosX, int startPosZ, int endPosX, int endPosZ)
+	{ return this.repo.getTimestampsForRange(detailLevel, startPosX, startPosZ, endPosX, endPosZ); }
+	
 	
 	
 	//===========//
@@ -616,7 +650,10 @@ public class FullDataSourceProviderV2
 	public void close()
 	{
 		super.close();
-		this.updateQueueProcessor.shutdownNow();
+		if (this.updateQueueProcessor != null)
+		{
+			this.updateQueueProcessor.shutdownNow();
+		}
 		
 		this.legacyFileHandler.close();
 		

core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataSourceProvider.java

@@ -23,6 +23,7 @@ import com.seibel.distanthorizons.api.enums.worldGeneration.EDhApiWorldGeneratio
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.DhLightingEngine;
 import com.seibel.distanthorizons.core.generation.IFullDataSourceRetrievalQueue;
 import com.seibel.distanthorizons.core.generation.tasks.IWorldGenTaskTracker;
 import com.seibel.distanthorizons.core.generation.tasks.WorldGenResult;
@@ -36,12 +37,15 @@ import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.coreapi.util.BitShiftUtil;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;
 
 import java.awt.*;
+import java.io.File;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
+import java.util.stream.IntStream;
 
 public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 implements IDebugRenderable
 {
@@ -70,6 +74,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	//=============//
 	
 	public GeneratedFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure) { super(level, saveStructure); }
+	public GeneratedFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride) { super(level, saveStructure, saveDirOverride); }
 	
 	
 	
@@ -93,7 +98,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 			// don't log shutdown exceptions
 			if (!(exception instanceof CancellationException || exception.getCause() instanceof CancellationException))
 			{
-				LOGGER.error("Uncaught Gen Task Exception at [" + genTaskResult.pos + "], error: ["+ exception.getMessage() + "].", exception);
+				LOGGER.error("Uncaught Gen Task Exception at ["+genTaskResult.pos+"], error: ["+exception.getMessage()+"].", exception);
 			}
 		}
 		else if (genTaskResult.success)
@@ -139,7 +144,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	{
 		boolean oldQueueExists = this.worldGenQueueRef.compareAndSet(null, newWorldGenQueue);
 		LodUtil.assertTrue(oldQueueExists, "previous world gen queue is still here!");
-		LOGGER.info("Set world gen queue for level ["+this.level+"].");
+		LOGGER.info("Set world gen queue for level [" + this.level.getLevelWrapper().getDimensionName() + "].");
 	}
 	
 	@Override
@@ -214,7 +219,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 		}
 		
 		GenTask genTask = new GenTask(genPos);
-		CompletableFuture<WorldGenResult> worldGenFuture = worldGenQueue.submitGenTask(genPos, (byte) (DhSectionPos.getDetailLevel(genPos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL), genTask);
+		CompletableFuture<WorldGenResult> worldGenFuture = worldGenQueue.submitRetrievalTask(genPos, (byte) (DhSectionPos.getDetailLevel(genPos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL), genTask);
 		worldGenFuture.whenComplete((genTaskResult, ex) -> this.onWorldGenTaskComplete(genTaskResult, ex));
 		
 		return true;
@@ -237,6 +242,12 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	public int getUnsavedDataSourceCount() { return this.delayedFullDataSourceSaveCache.getUnsavedCount(); }
 	
 	
+	public boolean isFullyGenerated(byte[] columnGenerationSteps)
+	{
+		return IntStream.range(0, columnGenerationSteps.length)
+				.noneMatch(i -> columnGenerationSteps[i] == EDhApiWorldGenerationStep.EMPTY.value);
+	}
+	
 	@Override
 	public LongArrayList getPositionsToRetrieve(Long pos)
 	{
@@ -385,16 +396,24 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 		public boolean isMemoryAddressValid() { return true; }
 		
 		@Override
-		public Consumer<FullDataSourceV2> getChunkDataConsumer()
+		public Consumer<FullDataSourceV2> getDataSourceConsumer()
 		{
 			return (chunkSizedFullDataSource) ->
 			{
 				GeneratedFullDataSourceProvider.this.delayedFullDataSourceSaveCache.queueDataSourceForUpdateAndSave(chunkSizedFullDataSource);
 			};
 		}
+		
 	}
 	private void onDataSourceSave(FullDataSourceV2 fullDataSource) 
-	{ GeneratedFullDataSourceProvider.this.updateDataSourceAsync(fullDataSource); }
+	{
+		// block lights should have been populated at the chunkWrapper stage
+		// waiting to populate the data source's skylight at this stage prevents re-lighting and
+		// allows us to reduce cross-chunk lighting issues by lighting the whole 4x4 LOD at once
+		DhLightingEngine.INSTANCE.bakeDataSourceSkyLight(fullDataSource, LodUtil.MAX_MC_LIGHT);
+		
+		GeneratedFullDataSourceProvider.this.updateDataSourceAsync(fullDataSource); 
+	}
 	
 	
 	

core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/RemoteFullDataSourceProvider.java

@@ -19,15 +19,119 @@
 
 package com.seibel.distanthorizons.core.file.fullDatafile;
 
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
 import com.seibel.distanthorizons.core.level.IDhLevel;
+import com.seibel.distanthorizons.core.level.WorldGenModule;
+import com.seibel.distanthorizons.core.multiplayer.client.SyncOnLoginRequestQueue;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
-public class RemoteFullDataSourceProvider extends FullDataSourceProviderV2
+/**
+ * Only handles {@link SyncOnLoginRequestQueue} requests (IE updating existing LODs based on a timestamp).
+ * Missing data is handled by {@link WorldGenModule} and {@link RemoteWorldRetrievalQueue}.
+ */
+public class RemoteFullDataSourceProvider extends GeneratedFullDataSourceProvider
 {
-	public RemoteFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure) { super(level, saveStructure); }
-	public RemoteFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride) { super(level, saveStructure, saveDirOverride); }
+	@Nullable
+	private final SyncOnLoginRequestQueue syncOnLoginRequestQueue;
+	private final Set<Long> finishedTaskPositions = ConcurrentHashMap.newKeySet();
 	
-}
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public RemoteFullDataSourceProvider(
+			IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride, 
+			@Nullable SyncOnLoginRequestQueue syncOnLoginRequestQueue)
+	{
+		super(level, saveStructure, saveDirOverride);
+		this.syncOnLoginRequestQueue = syncOnLoginRequestQueue;
+	}
+	
+	
+	
+	//==================//
+	// override methods //
+	//==================//
+	
+	@Override
+	@Nullable
+	public FullDataSourceV2 get(long pos)
+	{
+		//=======================//
+		// get local data source //
+		//=======================//
+		
+		FullDataSourceV2 fullDataSource = super.get(pos);
+		if (fullDataSource == null)
+		{
+			// we don't have any local data for this position,
+			// we can't queue updates based on a timestamp
+			return null;	
+		}
+		
+		if (this.syncOnLoginRequestQueue == null)
+		{
+			// we have local data, but aren't allowed to
+			// request timestamp updates from the server.
+			return fullDataSource;
+		}
+		
+		
+		
+		//===========================//
+		// request timestamp updates //
+		// from server               //
+		//===========================//
+		
+		// get the timestamp for every maximum detail position in this section
+		int posToMinimumDetailScale = (DhSectionPos.getDetailLevel(pos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL + 1);
+		Map<Long, Long> timestamps = this.getTimestampsForRange(
+				DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL,
+				DhSectionPos.getX(pos) * posToMinimumDetailScale,
+				DhSectionPos.getZ(pos) * posToMinimumDetailScale,
+				(DhSectionPos.getX(pos) + 1) * posToMinimumDetailScale - 1,
+				(DhSectionPos.getZ(pos) + 1) * posToMinimumDetailScale - 1
+		);
+		
+		// check if the server has newer versions of these LODs
+		for (Map.Entry<Long, Long> timestampBySectionPos : timestamps.entrySet())
+		{
+			Long subPos = timestampBySectionPos.getKey();
+			Long subTimestamp = timestampBySectionPos.getValue();
+			
+			if (this.finishedTaskPositions.add(subPos))
+			{
+				this.syncOnLoginRequestQueue.submitRequest(subPos, subTimestamp, this.delayedFullDataSourceSaveCache::queueDataSourceForUpdateAndSave);
+			}
+		}
+		
+		return fullDataSource;
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		if (this.syncOnLoginRequestQueue != null)
+		{
+			this.syncOnLoginRequestQueue.close();
+		}
+		super.close();
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/file/structure/ClientOnlySaveStructure.java

@@ -29,7 +29,6 @@ import com.seibel.distanthorizons.core.util.objects.ParsedIp;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.IDimensionTypeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.coreapi.util.StringUtil;
 
@@ -88,9 +87,9 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 			if (newLevelWrapper instanceof IServerKeyedClientLevel)
 			{
 				IServerKeyedClientLevel keyedClientLevel = (IServerKeyedClientLevel) newLevelWrapper;
-				LOGGER.info("Loading level " + newLevelWrapper.getDimensionType().getDimensionName() + " with key: " + keyedClientLevel.getServerLevelKey());
+				LOGGER.info("Loading level " + newLevelWrapper.getDimensionName() + " with key: " + keyedClientLevel.getServerLevelKey());
 				// This world was identified by the server directly, so we can know for sure which folder to use.
-				return new File(getSaveStructureFolderPath() + File.separatorChar + keyedClientLevel.getServerLevelKey());
+				return new File(getSaveStructureFolderPath() + File.separatorChar + keyedClientLevel.getServerLevelKey().replaceAll(":", "@@"));
 			}
 			
 			
@@ -102,9 +101,9 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 				// create the matcher if one doesn't exist
 				if (this.subDimMatcher == null || !this.subDimMatcher.isFindingLevel(newClientLevelWrapper))
 				{
-					LOGGER.info("Loading level " + newClientLevelWrapper.getDimensionType().getDimensionName());
+					LOGGER.info("Loading level " + newClientLevelWrapper.getDimensionName());
 					
-					List<File> levelFolders = this.getDhDataFoldersForDimension(newClientLevelWrapper.getDimensionType());
+					List<File> levelFolders = this.getDhDataFoldersForLevel(newClientLevelWrapper);
 					this.subDimMatcher = new SubDimensionLevelMatcher(newClientLevelWrapper, this.folder, levelFolders);
 				}
 				
@@ -133,7 +132,7 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 	
 	private File getLevelFolderWithoutSimilarityMatching(ILevelWrapper level)
 	{
-		List<File> folders = this.getDhDataFoldersForDimension(level.getDimensionType());
+		List<File> folders = this.getDhDataFoldersForLevel(level);
 		if (!folders.isEmpty() && folders.get(0) != null)
 		{
 			// use the first existing sub-dimension
@@ -144,12 +143,12 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 		else
 		{
 			// no valid sub dimension was found, create a new one
-			LOGGER.info("Default Sub Dimension not found. Creating: [" + level.getDimensionType().getDimensionName() + "]");
-			return new File(this.folder, level.getDimensionType().getDimensionName());
+			LOGGER.info("Default Sub Dimension not found. Creating: [" + level.getDimensionName() + "]");
+			return new File(this.folder, level.getDimensionName().replaceAll(":", "@@"));
 		}
 	}
 	
-	public List<File> getDhDataFoldersForDimension(IDimensionTypeWrapper dimensionType)
+	public List<File> getDhDataFoldersForLevel(ILevelWrapper level)
 	{
 		File[] folders = this.folder.listFiles();
 		if (folders == null)
@@ -158,7 +157,7 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 		}
 		
 		// filter by dimension name
-		String expectedDimName = dimensionType.getDimensionName();
+		String expectedDimName = level.getDimensionName();
 		ArrayList<File> possibleDimFolders = new ArrayList<>();
 		for (File dimFolder : folders)
 		{

core/src/main/java/com/seibel/distanthorizons/core/file/subDimMatching/SubDimensionLevelMatcher.java

@@ -60,6 +60,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
  * @author James Seibel
  * @version 12-17-2022
  */
+@Deprecated
 public class SubDimensionLevelMatcher implements AutoCloseable
 {
 	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
@@ -184,11 +185,6 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 		DhLightingEngine.INSTANCE.lightChunk(newlyLoadedChunk, new ArrayList<>(), MC_CLIENT.getWrappedClientLevel().hasSkyLight() ? 15 : 0);
 		
 		// build the chunk LOD
-		if (!LodDataBuilder.canGenerateLodFromChunk(newlyLoadedChunk))
-		{
-			LOGGER.warn("unable to build lod for chunk:"+newlyLoadedChunk.getChunkPos());
-			return null;
-		}
 		FullDataSourceV2 newChunkSizedFullDataView = FullDataSourceV2.createFromChunk(newlyLoadedChunk);
 		// convert to a data source for easier comparing
 		FullDataSourceV2 newDataSource = FullDataSourceV2.createEmpty(DhSectionPos.encodeContaining(DhSectionPos.SECTION_BLOCK_DETAIL_LEVEL, this.playerData.playerBlockPos));
@@ -201,8 +197,8 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 		//================================//
 		
 		// log the start of this attempt
-		LOGGER.info("Attempting to determine sub-dimension for [" + MC_CLIENT.getWrappedClientLevel().getDimensionType().getDimensionName() + "]");
-		LOGGER.info("Player block pos in dimension: [" + this.playerData.playerBlockPos.x + "," + this.playerData.playerBlockPos.y + "," + this.playerData.playerBlockPos.z + "]");
+		LOGGER.info("Attempting to determine sub-dimension for [" + MC_CLIENT.getWrappedClientLevel().getDimensionName() + "]");
+		LOGGER.info("Player block pos in dimension: [" + this.playerData.playerBlockPos.getX() + "," + this.playerData.playerBlockPos.getY() + "," + this.playerData.playerBlockPos.getZ() + "]");
 		LOGGER.info("Potential Sub Dimension folders: [" + this.potentialLevelFolders.size() + "]");
 		
 		SubDimCompare mostSimilarSubDim = null;
@@ -214,7 +210,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 			try
 			{
 				// get the data source to compare against
-				try (IDhLevel tempLevel = new DhClientLevel(new ClientOnlySaveStructure(), this.currentClientLevel, testLevelFolder, false))
+				try (IDhLevel tempLevel = new DhClientLevel(new ClientOnlySaveStructure(), this.currentClientLevel, testLevelFolder, false, null))
 				{
 					testFullDataSource = tempLevel.getFullDataProvider().getAsync(DhSectionPos.encodeContaining(DhSectionPos.SECTION_BLOCK_DETAIL_LEVEL, this.playerData.playerBlockPos)).join();
 					if (testFullDataSource == null)
@@ -315,7 +311,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 				
 				// get the player data for this dimension folder
 				SubDimensionPlayerData testPlayerData = new SubDimensionPlayerData(testLevelFolder);
-				LOGGER.info("Last known player pos: [" + testPlayerData.playerBlockPos.x + "," + testPlayerData.playerBlockPos.y + "," + testPlayerData.playerBlockPos.z + "]");
+				LOGGER.info("Last known player pos: [" + testPlayerData.playerBlockPos.getX() + "," + testPlayerData.playerBlockPos.getY() + "," + testPlayerData.playerBlockPos.getZ() + "]");
 				
 				// check if the block positions are close
 				int playerBlockDist = testPlayerData.playerBlockPos.getManhattanDistance(this.playerData.playerBlockPos);
@@ -380,7 +376,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 	}
 	
 	
-	private File CreateSubDimFolder(String subDimId) { return new File(this.levelsFolder.getPath() + File.separatorChar + this.currentClientLevel.getDimensionType().getDimensionName(), subDimId); }
+	private File CreateSubDimFolder(String subDimId) { return new File(this.levelsFolder.getPath() + File.separatorChar + this.currentClientLevel.getDimensionName(), subDimId); }
 	
 	@Override
 	public void close() { this.matcherThread.shutdownNow(); }

core/src/main/java/com/seibel/distanthorizons/core/file/subDimMatching/SubDimensionPlayerData.java

@@ -22,7 +22,7 @@ package com.seibel.distanthorizons.core.file.subDimMatching;
 
 import com.electronwill.nightconfig.core.file.CommentedFileConfig;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 
@@ -127,9 +127,9 @@ public class SubDimensionPlayerData
 	public void toTomlFile(CommentedFileConfig toml)
 	{
 		// player block pos
-		toml.add(PLAYER_BLOCK_POS_X_PATH, this.playerBlockPos.x);
-		toml.add(PLAYER_BLOCK_POS_Y_PATH, this.playerBlockPos.y);
-		toml.add(PLAYER_BLOCK_POS_Z_PATH, this.playerBlockPos.z);
+		toml.add(PLAYER_BLOCK_POS_X_PATH, this.playerBlockPos.getX());
+		toml.add(PLAYER_BLOCK_POS_Y_PATH, this.playerBlockPos.getY());
+		toml.add(PLAYER_BLOCK_POS_Z_PATH, this.playerBlockPos.getZ());
 		
 		toml.save();
 	}
@@ -138,7 +138,7 @@ public class SubDimensionPlayerData
 	@Override
 	public String toString()
 	{
-		return "PlayerBlockPos: [" + this.playerBlockPos.x + "," + this.playerBlockPos.y + "," + this.playerBlockPos.z + "]";
+		return "PlayerBlockPos: [" + this.playerBlockPos.getX() + "," + this.playerBlockPos.getY() + "," + this.playerBlockPos.getZ() + "]";
 	}
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/generation/AdjacentChunkHolder.java

@@ -33,7 +33,7 @@ public class AdjacentChunkHolder
 		{
 			for (int zOffset = -1; zOffset <= 1; zOffset++)
 			{
-				DhChunkPos adjacentPos = new DhChunkPos(centerChunkPos.x + xOffset, centerChunkPos.z + zOffset);
+				DhChunkPos adjacentPos = new DhChunkPos(centerChunkPos.getX() + xOffset, centerChunkPos.getZ() + zOffset);
 				requestedAdjacentPositions.add(adjacentPos);
 			}
 		}
@@ -69,13 +69,13 @@ public class AdjacentChunkHolder
 		DhChunkPos centerPos = this.chunkArray[4].getChunkPos();
 		DhChunkPos offsetPos = centerWrapper.getChunkPos();
 		
-		int offsetX = offsetPos.x - centerPos.x;
+		int offsetX = offsetPos.getX() - centerPos.getX();
 		if (offsetX < -1 || offsetX > 1)
 		{
 			return;
 		}
 		
-		int offsetZ = offsetPos.z - centerPos.z;
+		int offsetZ = offsetPos.getZ() - centerPos.getZ();
 		if (offsetZ < -1 || offsetZ > 1)
 		{
 			return;
@@ -91,18 +91,18 @@ public class AdjacentChunkHolder
 		int chunkZ = BitShiftUtil.divideByPowerOfTwo(blockZ, 4);
 		IChunkWrapper centerChunk = this.chunkArray[4];
 		DhChunkPos centerPos = centerChunk.getChunkPos();
-		if (centerPos.x == chunkX && centerPos.z == chunkZ)
+		if (centerPos.getX() == chunkX && centerPos.getZ() == chunkZ)
 		{
 			return centerChunk;
 		}
 		
-		int offsetX = chunkX - centerPos.x;
+		int offsetX = chunkX - centerPos.getX();
 		if (offsetX < -1 || offsetX > 1)
 		{
 			return null;
 		}
 		
-		int offsetZ = chunkZ - centerPos.z;
+		int offsetZ = chunkZ - centerPos.getZ();
 		if (offsetZ < -1 || offsetZ > 1)
 		{
 			return null;

core/src/main/java/com/seibel/distanthorizons/core/generation/DhLightingEngine.java

@@ -19,15 +19,23 @@
 
 package com.seibel.distanthorizons.core.generation;
 
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPosMutable;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.util.FullDataPointUtil;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IMutableBlockPosWrapper;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;
 
+import java.awt.*;
 import java.util.*;
 import java.util.concurrent.locks.ReentrantLock;
 
@@ -49,15 +57,59 @@ public class DhLightingEngine
 	 * Since these objects are always mutated anyway, using a {@link ThreadLocal} will allow us to
 	 * only create as many of these {@link DhBlockPos} as necessary.
 	 */
-	private static final ThreadLocal<DhBlockPos> PRIMARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPos());
-	private static final ThreadLocal<DhBlockPos> SECONDARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPos());
+	private static final ThreadLocal<DhBlockPosMutable> PRIMARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPosMutable());
+	private static final ThreadLocal<DhBlockPosMutable> SECONDARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPosMutable());
+	
+	/** if enabled will render each block light value when the chunk lighting engine is run */
+	private static final boolean RENDER_BLOCK_LIGHT_WIREFRAME = false;
+	/** if enabled will render each sky light value when the chunk lighting engine is run */
+	private static final boolean RENDER_SKY_LIGHT_WIREFRAME = false;
+	
+	/**
+	 * Used for dataSource lighting. <br> 
+	 * Packed as alternating x and z offsets. 
+	 */
+	private static final byte[] ADJACENT_DIRECTION_OFFSETS = new byte[]
+			{
+					-1, 0,
+					+1, 0,
+					0, -1,
+					0, +1
+			};
 	
 	
 	
+	//=============//
+	// constructor //
+	//=============//
+	
 	private DhLightingEngine() { }
 	
 	
 	
+	//================//
+	// chunk lighting //
+	//================//
+	
+	/**
+	 * Populates both block and sky lighting. 
+	 * @see DhLightingEngine#lightChunk(IChunkWrapper, ArrayList, int, boolean, boolean) 
+	 */
+	public void lightChunk(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList,
+			int maxSkyLight)
+	{ this.lightChunk(centerChunk, nearbyChunkList, maxSkyLight, true, true); }
+	
+	/**
+	 * Only populates block lights. 
+	 * @see DhLightingEngine#lightChunk(IChunkWrapper, ArrayList, int, boolean, boolean) 
+	 */
+	public void bakeChunkBlockLighting(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList,
+			int maxSkyLight)
+	{ this.lightChunk(centerChunk, nearbyChunkList, maxSkyLight, true, false); }
+	
+	
 	/**
 	 * Note: depending on the implementation of {@link IChunkWrapper#setDhBlockLight(int, int, int, int)} and {@link IChunkWrapper#setDhSkyLight(int, int, int, int)}
 	 * the light values may be stored in the wrapper itself instead of the wrapped chunk object.
@@ -67,21 +119,21 @@ public class DhLightingEngine
 	 * @param nearbyChunkList should also contain centerChunk
 	 * @param maxSkyLight should be a value between 0 and 15
 	 */
-	public void lightChunk(@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList, int maxSkyLight)
+	private void lightChunk(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList, 
+			int maxSkyLight, boolean updateBlockLight, boolean updateSkyLight)
 	{
 		DhChunkPos centerChunkPos = centerChunk.getChunkPos();
 		AdjacentChunkHolder adjacentChunkHolder = new AdjacentChunkHolder(centerChunk);
 		
-		long startTimeNs = System.nanoTime();
-		
 		
 		// try-finally to handle the stableArray resources
-		StableLightPosStack blockLightPosQueue = null;
-		StableLightPosStack skyLightPosQueue = null;
+		StableLightPosStack blockLightWorldPosQueue = null;
+		StableLightPosStack skyLightWorldPosQueue = null;
 		try
 		{
-			blockLightPosQueue = StableLightPosStack.borrowStableLightPosArray();
-			skyLightPosQueue = StableLightPosStack.borrowStableLightPosArray();
+			blockLightWorldPosQueue = StableLightPosStack.borrowStableLightPosArray();
+			skyLightWorldPosQueue = StableLightPosStack.borrowStableLightPosArray();
 			
 			
 			
@@ -92,7 +144,7 @@ public class DhLightingEngine
 			{
 				for (int zOffset = -1; zOffset <= 1; zOffset++)
 				{
-					DhChunkPos adjacentPos = new DhChunkPos(centerChunkPos.x + xOffset, centerChunkPos.z + zOffset);
+					DhChunkPos adjacentPos = new DhChunkPos(centerChunkPos.getX() + xOffset, centerChunkPos.getZ() + zOffset);
 					requestedAdjacentPositions.add(adjacentPos);
 				}
 			}
@@ -100,7 +152,6 @@ public class DhLightingEngine
 			
 			// find all adjacent chunks
 			// and get any necessary info from them
-			boolean warningLogged = false;
 			for (int chunkIndex = 0; chunkIndex < nearbyChunkList.size(); chunkIndex++) // using iterators in high traffic areas can cause GC issues due to allocating a bunch of iterators, use an indexed for-loop instead
 			{
 				IChunkWrapper chunk = nearbyChunkList.get(chunkIndex);
@@ -112,33 +163,46 @@ public class DhLightingEngine
 					// add the adjacent chunk
 					adjacentChunkHolder.add(chunk);
 					
-					
-					
 					// get and set the adjacent chunk's initial block lights
-					final DhBlockPos relLightBlockPos = PRIMARY_BLOCK_POS_REF.get();
-					final DhBlockPos relBlockPos = SECONDARY_BLOCK_POS_REF.get();
+					final DhBlockPosMutable relLightBlockPos = PRIMARY_BLOCK_POS_REF.get();
 					
-					ArrayList<DhBlockPos> blockLightPosList = chunk.getBlockLightPosList();
-					for (int blockLightIndex = 0; blockLightIndex < blockLightPosList.size(); blockLightIndex++) // using iterators in high traffic areas can cause GC issues due to allocating a bunch of iterators, use an indexed for-loop instead
+					
+					
+					//==================//
+					// set block lights //
+					//==================//
+					
+					if (updateBlockLight)
 					{
-						DhBlockPos blockLightPos = blockLightPosList.get(blockLightIndex);
-						blockLightPos.mutateToChunkRelativePos(relLightBlockPos);
-						
-						// get the light
-						IBlockStateWrapper blockState = chunk.getBlockState(relLightBlockPos);
-						int lightValue = blockState.getLightEmission();
-						blockLightPosQueue.push(blockLightPos.x, blockLightPos.y, blockLightPos.z, lightValue);
-						
-						// set the light
-						blockLightPos.mutateToChunkRelativePos(relBlockPos);
-						chunk.setDhBlockLight(relBlockPos.x, relBlockPos.y, relBlockPos.z, lightValue);
+						ArrayList<DhBlockPos> blockLightPosList = chunk.getWorldBlockLightPosList();
+						for (int blockLightIndex = 0; blockLightIndex < blockLightPosList.size(); blockLightIndex++) // using iterators in high traffic areas can cause GC issues due to allocating a bunch of iterators, use an indexed for-loop instead
+						{
+							DhBlockPos blockLightPos = blockLightPosList.get(blockLightIndex);
+							blockLightPos.mutateToChunkRelativePos(relLightBlockPos);
+							
+							// get the light
+							IBlockStateWrapper blockState = chunk.getBlockState(relLightBlockPos);
+							int lightValue = blockState.getLightEmission();
+							blockLightWorldPosQueue.push(blockLightPos.getX(), blockLightPos.getY(), blockLightPos.getZ(), lightValue);
+							
+							// set the light
+							chunk.setDhBlockLight(relLightBlockPos.getX(), relLightBlockPos.getY(), relLightBlockPos.getZ(), lightValue);
+						}
 					}
 					
 					
+					
+					//================//
+					// set sky lights //
+					//================//
+					
 					// get and set the adjacent chunk's initial skylights,
 					// if the dimension has skylights
-					if (maxSkyLight > 0)
+					if (updateSkyLight && maxSkyLight > 0)
 					{
+						IMutableBlockPosWrapper mcBlockPos = chunk.getMutableBlockPosWrapper();
+						IBlockStateWrapper previousBlockState = null;
+						
 						int maxY = chunk.getMaxNonEmptyHeight();
 						int minY = chunk.getMinBuildHeight();
 						
@@ -150,7 +214,7 @@ public class DhLightingEngine
 								// set each pos' sky light all the way down until an opaque block is hit
 								for (int y = maxY; y >= minY; y--)
 								{
-									IBlockStateWrapper block = chunk.getBlockState(relX, y, relZ);
+									IBlockStateWrapper block = previousBlockState = chunk.getBlockState(relX, y, relZ, mcBlockPos, previousBlockState);
 									if (block != null && block.getOpacity() != LodUtil.BLOCK_FULLY_TRANSPARENT)
 									{
 										// keep moving down until we find a non-transparent block
@@ -160,11 +224,11 @@ public class DhLightingEngine
 									
 									// add sky light to the queue
 									DhBlockPos skyLightPos = new DhBlockPos(chunk.getMinBlockX() + relX, y, chunk.getMinBlockZ() + relZ);
-									skyLightPosQueue.push(skyLightPos.x, skyLightPos.y, skyLightPos.z, maxSkyLight);
+									skyLightWorldPosQueue.push(skyLightPos.getX(), skyLightPos.getY(), skyLightPos.getZ(), maxSkyLight);
 									
 									// set the chunk's sky light
-									skyLightPos.mutateToChunkRelativePos(relBlockPos);
-									chunk.setDhSkyLight(relBlockPos.x, relBlockPos.y, relBlockPos.z, maxSkyLight);
+									skyLightPos.mutateToChunkRelativePos(relLightBlockPos);
+									chunk.setDhSkyLight(relLightBlockPos.getX(), relLightBlockPos.getY(), relLightBlockPos.getZ(), maxSkyLight);
 								}
 							}
 						}
@@ -180,14 +244,22 @@ public class DhLightingEngine
 			}
 			
 			// block light
-			this.propagateLightPosList(blockLightPosQueue, adjacentChunkHolder,
-					(neighbourChunk, relBlockPos) -> neighbourChunk.getDhBlockLight(relBlockPos.x, relBlockPos.y, relBlockPos.z),
-					(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhBlockLight(relBlockPos.x, relBlockPos.y, relBlockPos.z, newLightValue));
+			if (updateBlockLight)
+			{
+				this.propagateChunkLightPosList(blockLightWorldPosQueue, adjacentChunkHolder,
+						(neighbourChunk, relBlockPos) -> neighbourChunk.getDhBlockLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ()),
+						(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhBlockLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ(), newLightValue),
+						true);
+			}
 			
 			// sky light
-			this.propagateLightPosList(skyLightPosQueue, adjacentChunkHolder,
-					(neighbourChunk, relBlockPos) -> neighbourChunk.getDhSkyLight(relBlockPos.x, relBlockPos.y, relBlockPos.z),
-					(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhSkyLight(relBlockPos.x, relBlockPos.y, relBlockPos.z, newLightValue));
+			if (updateSkyLight)
+			{
+				this.propagateChunkLightPosList(skyLightWorldPosQueue, adjacentChunkHolder,
+						(neighbourChunk, relBlockPos) -> neighbourChunk.getDhSkyLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ()),
+						(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhSkyLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ(), newLightValue),
+						false);
+			}
 		}
 		catch (Exception e)
 		{
@@ -195,31 +267,35 @@ public class DhLightingEngine
 		}
 		finally
 		{
-			StableLightPosStack.returnStableLightPosArray(blockLightPosQueue);
-			StableLightPosStack.returnStableLightPosArray(skyLightPosQueue);
+			StableLightPosStack.returnStableLightPosArray(blockLightWorldPosQueue);
+			StableLightPosStack.returnStableLightPosArray(skyLightWorldPosQueue);
 		}
 		
 		
-		
-		centerChunk.setIsDhLightCorrect(true);
-		centerChunk.setUseDhLighting(true);
-		
-		long endTimeNs = System.nanoTime();
-		float totalTimeMs = (endTimeNs - startTimeNs) / 1_000_000.0f;
-		//LOGGER.trace("Finished generating lighting for chunk: [" + centerChunkPos + "] in ["+totalTimeMs+"] milliseconds");
+		if (updateBlockLight)
+		{
+			centerChunk.setIsDhBlockLightCorrect(true);
+		}
+		if (updateSkyLight)
+		{
+			centerChunk.setIsDhSkyLightCorrect(true);
+		}
 	}
 	
 	/** Applies each {@link LightPos} from the queue to the given set of {@link IChunkWrapper}'s. */
-	private void propagateLightPosList(
+	private void propagateChunkLightPosList(
 			StableLightPosStack lightPosQueue, AdjacentChunkHolder adjacentChunkHolder,
-			IGetLightFunc getLightFunc, ISetLightFunc setLightFunc)
+			IGetLightFunc getLightFunc, ISetLightFunc setLightFunc,
+			boolean propagatingBlockLights)
 	{
 		// these objects are saved so they can be mutated throughout the method,
 		// this reduces the number of allocations necessary, reducing GC pressure
 		final LightPos lightPos = new LightPos(0, 0, 0, 0);
-		final DhBlockPos neighbourBlockPos = PRIMARY_BLOCK_POS_REF.get();
-		final DhBlockPos relNeighbourBlockPos = SECONDARY_BLOCK_POS_REF.get();
+		final DhBlockPosMutable neighbourBlockPos = PRIMARY_BLOCK_POS_REF.get();
+		final DhBlockPosMutable relNeighbourBlockPos = SECONDARY_BLOCK_POS_REF.get();
 		
+		IMutableBlockPosWrapper mcBlockPos = null;
+		IBlockStateWrapper previousBlockState = null;
 		
 		// update each light position
 		while (!lightPosQueue.isEmpty())
@@ -239,14 +315,14 @@ public class DhLightingEngine
 				
 				
 				// only continue if the light position is inside one of our chunks
-				IChunkWrapper neighbourChunk = adjacentChunkHolder.getByBlockPos(neighbourBlockPos.x, neighbourBlockPos.z);
+				IChunkWrapper neighbourChunk = adjacentChunkHolder.getByBlockPos(neighbourBlockPos.getX(), neighbourBlockPos.getZ());
 				if (neighbourChunk == null)
 				{
 					// the light pos is outside our generator's range, ignore it
 					continue;
 				}
 				
-				if (relNeighbourBlockPos.y < neighbourChunk.getMinNonEmptyHeight() || relNeighbourBlockPos.y > neighbourChunk.getMaxBuildHeight())
+				if (relNeighbourBlockPos.getY() < neighbourChunk.getMinNonEmptyHeight() || relNeighbourBlockPos.getY() > neighbourChunk.getMaxBuildHeight())
 				{
 					// the light pos is outside the chunk's min/max height,
 					// this can happen if given a chunk that hasn't finished generating
@@ -263,7 +339,15 @@ public class DhLightingEngine
 				}
 				
 				
-				IBlockStateWrapper neighbourBlockState = neighbourChunk.getBlockState(relNeighbourBlockPos);
+				if (mcBlockPos == null)
+				{
+					// it doesn't matter what chunk we get the position object from
+					// TODO move this getter logic out of ChunkWrapper
+					mcBlockPos = neighbourChunk.getMutableBlockPosWrapper();
+				}
+				
+				
+				IBlockStateWrapper neighbourBlockState = previousBlockState = neighbourChunk.getBlockState(relNeighbourBlockPos, mcBlockPos, previousBlockState);
 				// Math.max(1, ...) is used so that the propagated light level always drops by at least 1, preventing infinite cycles.
 				int targetLevel = lightValue - Math.max(1, neighbourBlockState.getOpacity());
 				if (targetLevel > currentBlockLight)
@@ -273,16 +357,338 @@ public class DhLightingEngine
 					
 					// now that light has been propagated to this blockPos
 					// we need to queue it up so its neighbours can be propagated as well
-					lightPosQueue.push(neighbourBlockPos.x, neighbourBlockPos.y, neighbourBlockPos.z, targetLevel);
+					lightPosQueue.push(neighbourBlockPos.getX(), neighbourBlockPos.getY(), neighbourBlockPos.getZ(), targetLevel);
 				}
 			}
 		}
 		
+		
+		// can be enable if troubleshooting lighting issues
+		if (RENDER_BLOCK_LIGHT_WIREFRAME && propagatingBlockLights)
+		{
+			RenderDhLightValuesAsWireframe(adjacentChunkHolder, true);
+		}
+		else if (RENDER_SKY_LIGHT_WIREFRAME && !propagatingBlockLights)
+		{
+			RenderDhLightValuesAsWireframe(adjacentChunkHolder, false);
+		}
+		
+		
 		// propagation complete
 	}
 	
 	
 	
+	//======================//
+	// data source lighting //
+	//======================//
+	
+	/** @author BuilderB0y */
+	public void bakeDataSourceSkyLight(FullDataSourceV2 dataSource, int maxSkyLight)
+	{
+		// create a cache of all the IDs which are completely transparent.
+		// FullDataPointIdMap is thread-safe with locks, and is also a map lookup,
+		// and both of these things add a bit of overhead which is not necessary
+		// in this context.
+		// note: since IDs map to both biomes and blocks, there can be more than
+		// one ID which corresponds to air.
+		BitSet airIDs = new BitSet(dataSource.mapping.size());
+		for (int id = 0, size = dataSource.mapping.size(); id < size; id++)
+		{
+			if (dataSource.mapping.getBlockStateWrapper(id).getOpacity() == 0)
+			{
+				airIDs.set(id, true);
+			}
+		}
+		
+		
+		for (int z = 0; z < FullDataSourceV2.WIDTH; z++)
+		{
+			for (int x = 0; x < FullDataSourceV2.WIDTH; x++)
+			{
+				LongArrayList dataPoints = dataSource.get(x, z);
+				if (dataPoints != null && !dataPoints.isEmpty())
+				{
+					// iterate through the data points in this column top-down
+					// until we reach light level 0 in some way. at this point,
+					// no more propagation needs to be performed for this column.
+					int size = dataPoints.size();
+					for (int index = 0; index < size; index++)
+					{
+						long point = dataPoints.getLong(index);
+						// if the data point in the column is transparent,
+						// then fill it with light and then propagate 
+						// that light both horizontally and downwards.
+						if (airIDs.get(FullDataPointUtil.getId(point)))
+						{
+							int skylight;
+							if (index == 0)
+							{
+								// top-most data point in the column.
+								skylight = maxSkyLight;
+							}
+							else
+							{
+								// handle down propagation here. sort of.
+								// down propagation is also handled partially elsewhere.
+								// basically if the data point above is transparent,
+								// we copy its light level.
+								// otherwise, if the data point above is opaque,
+								// then no light can propagate downwards from it.
+								// therefore, this data point should be light level 0*
+								// and no more propagation needs to be performed for this column.
+								//
+								// *unless light propagates into it horizontally,
+								// but that is handled separately.
+								long above = dataPoints.getLong(index - 1);
+								if (airIDs.get(FullDataPointUtil.getId(above)))
+								{
+									skylight = FullDataPointUtil.getSkyLight(above);
+								}
+								else
+								{
+									continue;
+								}
+							}
+							
+							// update the data point to contain the correct starting skylight level.
+							point = FullDataPointUtil.setSkyLight(point, skylight);
+							dataPoints.set(index, point);
+							// now for the propagation.
+							recursivelyLightAdjacentDataPoints(dataSource, airIDs, x, z, point);
+						}
+					}
+				}
+			}
+		}
+		
+		
+		// at this point, all transparent data points have been lit,
+		// but opaque ones still have light level 0.
+		// in this loop we make opaque data points copy the light level
+		// above them if, and only if, the data point above is translucent.
+		// with one exception: if the data point above is only partially translucent,
+		// we use a slightly different way of computing how much light it absorbed.
+		// this is how we handle water and ocean floors.
+		// note that this alternate logic assumes the 
+		// data point above is being lit from the top.
+		// this is a fine assumption for water and oceans.
+		for (LongArrayList list : dataSource.dataPoints)
+		{
+			if (list != null)
+			{
+				for (int index = 0, size = list.size(); index < size; index++)
+				{
+					long dataPoint = list.getLong(index);
+					if (index == 0)
+					{
+						// top data point, assume "above" has the max sky light.
+						dataPoint = FullDataPointUtil.setSkyLight(dataPoint, maxSkyLight);
+						list.set(index, dataPoint);
+					}
+					else
+					{
+						// there is another data point above this one.
+						// check to see how opaque this data point is first.
+						// we will check the above one after that.
+						if (!airIDs.get(FullDataPointUtil.getId(dataPoint)))
+						{
+							// this data point is not transparent.
+							// it should be lit from above.
+							long above = list.getLong(index - 1);
+							int aboveLight = FullDataPointUtil.getSkyLight(above);
+							if (airIDs.get(FullDataPointUtil.getId(above)))
+							{
+								// the above data point is transparent,
+								// and does not absorb any light.
+								// its light level can be copied as-is.
+								dataPoint = FullDataPointUtil.setSkyLight(dataPoint, aboveLight);
+								list.set(index, dataPoint);
+							}
+							else
+							{
+								// determine how much light should be absorbed by this column
+								int absorption = dataSource.mapping.getBlockStateWrapper(FullDataPointUtil.getId(above)).getOpacity() * FullDataPointUtil.getHeight(above);
+								if (absorption < aboveLight)
+								{
+									// the above data point is partially translucent,
+									// and absorbs some light. however, it did not absorb
+									// enough light to bring the light level down to 0.
+									// so, the remaining light can still be copied.
+									dataPoint = FullDataPointUtil.setSkyLight(dataPoint, aboveLight - absorption);
+									list.set(index, dataPoint);
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	/** @author BuilderB0y */
+	public void recursivelyLightAdjacentDataPoints(
+			FullDataSourceV2 chunk,
+			BitSet airIDs,
+			int relativeX,
+			int relativeZ,
+			long dataPoint
+		)
+	{
+		int lightLevel = FullDataPointUtil.getSkyLight(dataPoint);
+		// early exit condition:
+		// in this case, propagating light is guaranteed to be 0 at adjacent positions,
+		// and therefore we do not need to waste time propagating it.
+		if (lightLevel <= 1)
+		{
+			return;
+		}
+		
+		
+		
+		int minY = FullDataPointUtil.getBottomY(dataPoint);
+		int maxY = FullDataPointUtil.getHeight(dataPoint) + minY;
+		// try to propagate in all 4 directions.
+		for (int offsetIndex = 0; offsetIndex < ADJACENT_DIRECTION_OFFSETS.length; )
+		{
+			int adjacentX = relativeX + ADJACENT_DIRECTION_OFFSETS[offsetIndex++];
+			int adjacentZ = relativeZ + ADJACENT_DIRECTION_OFFSETS[offsetIndex++];
+			
+			// check if the adjacent position is within the bounds of this data source...
+			if (adjacentX >= 0 && adjacentX < FullDataSourceV2.WIDTH && adjacentZ >= 0 && adjacentZ < FullDataSourceV2.WIDTH)
+			{
+				LongArrayList adjacentDataPoints = chunk.get(adjacentX, adjacentZ);
+				// ...and also check to make sure we have some data points
+				// (potentially transparent ones) to propagate through in the adjacent column.
+				if (adjacentDataPoints != null)
+				{
+					// try to find adjacent data points we can propagate into.
+					// we go top-down for this, which will be important for some
+					// later conditions.
+					int size = adjacentDataPoints.size();
+					for (int adjacentIndex = 0; adjacentIndex < size; adjacentIndex++)
+					{
+						long adjacentDataPoint = adjacentDataPoints.getLong(adjacentIndex);
+						int adjacentMinY = FullDataPointUtil.getBottomY(adjacentDataPoint);
+						int adjacentMaxY = FullDataPointUtil.getHeight(adjacentDataPoint) + adjacentMinY;
+						if (adjacentMinY >= maxY)
+						{
+							// if the adjacent data point is completely above this one,
+							// then there is no overlap between this one and the adjacent one,
+							// and therefore light cannot propagate here.
+							// try to propagate to the next data point down from the adjacent one.
+							continue;
+						}
+						else if (adjacentMaxY <= minY)
+						{
+							// if the adjacent data point is completely below this one,
+							// then it also has no overlap and can't propagate,
+							// but since we're going top-down, neither can any subsequent adjacent data points.
+							break;
+						}
+						else if (!airIDs.get(FullDataPointUtil.getId(adjacentDataPoint)))
+						{
+							// assume for now that we cannot propagate into non-transparent data points.
+							continue; // TODO how does this work with water? Do we care?
+						}
+						else
+						{
+							// now we can try to propagate.
+							int adjacentLightLevel = FullDataPointUtil.getSkyLight(adjacentDataPoint);
+							// if the resulting light level after propagation would INCREASE
+							// the light level of the adjacent data point, then propagate to it.
+							// otherwise, don't do that.
+							if (lightLevel - 1 > adjacentLightLevel)
+							{
+								adjacentDataPoint = FullDataPointUtil.setSkyLight(adjacentDataPoint, lightLevel - 1);
+								adjacentDataPoints.set(adjacentIndex, adjacentDataPoint);
+								// if propagation succeeded, recursively propagate again starting at the adjacent data point.
+								recursivelyLightAdjacentDataPoints(chunk, airIDs, adjacentX, adjacentZ, adjacentDataPoint);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
+	/** Draw a wireframe representing each block's light value */
+	private static void RenderDhLightValuesAsWireframe(AdjacentChunkHolder adjacentChunkHolder, boolean renderBlockLights)
+	{
+		for (IChunkWrapper chunk : adjacentChunkHolder.chunkArray)
+		{
+			if (chunk == null)
+			{
+				continue;
+			}
+			
+			
+			
+			int chunkMinX = chunk.getMinBlockX();
+			int chunkMinZ = chunk.getMinBlockZ();
+			
+			int minY = chunk.getMinNonEmptyHeight();
+			int maxY = chunk.getMaxNonEmptyHeight();
+			
+			// check each position's light
+			for (int x = 0; x < LodUtil.CHUNK_WIDTH; x++)
+			{
+				for (int z = 0; z < LodUtil.CHUNK_WIDTH; z++)
+				{
+					for (int y = minY; y < maxY; y++)
+					{
+						int lightValue = renderBlockLights? chunk.getDhBlockLight(x, y, z) : chunk.getDhSkyLight(x, y, z);
+						if (lightValue != LodUtil.MIN_MC_LIGHT)
+						{
+							// hotter colors for more intense light
+							Color color;
+							if (lightValue >= 14)
+							{
+								color = Color.WHITE;
+							}
+							else if (lightValue >= 10)
+							{
+								color = Color.PINK;
+							}
+							else if (lightValue >= 6)
+							{
+								color = Color.YELLOW;
+							}
+							else if (lightValue >= 4)
+							{
+								color = Color.ORANGE;
+							}
+							else
+							{
+								color = Color.RED;
+							}
+							
+							
+							// a color can be set to null if you only want to troubleshoot up to a certain light level
+							if (color != null)
+							{
+								DebugRenderer.makeParticle(
+									new DebugRenderer.BoxParticle(
+										new DebugRenderer.Box(DhSectionPos.encode((byte) 0, chunkMinX + x, chunkMinZ + z), y, y + 1, 0.2f, color),
+										10.0, 0f
+									)
+								);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	
+	
 	//================//
 	// helper classes //
 	//================//
@@ -293,7 +699,7 @@ public class DhLightingEngine
 	@FunctionalInterface
 	interface ISetLightFunc { void setLight(IChunkWrapper chunk, DhBlockPos pos, int lightValue); }
 	
-	private static class LightPos extends DhBlockPos
+	private static class LightPos extends DhBlockPosMutable
 	{
 		public int lightValue;
 		
@@ -303,6 +709,11 @@ public class DhLightingEngine
 			this.lightValue = lightValue;
 		}
 		
+		
+		@Override
+		public String toString() { return this.lightValue+" - ["+ this.x +", "+ this.y +", "+ this.z +"]"; }
+		
+		
 	}
 	
 	/** 
@@ -402,9 +813,9 @@ public class DhLightingEngine
 		{
 			int subIndex = this.index * INTS_PER_LIGHT_POS;
 			
-			pos.x = this.lightPositions.getInt(subIndex);
-			pos.y = this.lightPositions.getInt(subIndex + 1);
-			pos.z = this.lightPositions.getInt(subIndex + 2);
+			pos.setX(this.lightPositions.getInt(subIndex));
+			pos.setY(this.lightPositions.getInt(subIndex + 1));
+			pos.setZ(this.lightPositions.getInt(subIndex + 2));
 			pos.lightValue = this.lightPositions.getInt(subIndex + 3);
 			
 			this.index--;

core/src/main/java/com/seibel/distanthorizons/core/generation/IFullDataSourceRetrievalQueue.java

@@ -21,11 +21,12 @@ package com.seibel.distanthorizons.core.generation;
 
 import com.seibel.distanthorizons.core.generation.tasks.IWorldGenTaskTracker;
 import com.seibel.distanthorizons.core.generation.tasks.WorldGenResult;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.LodQuadTree;
 
 import java.io.Closeable;
+import java.util.List;
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -49,9 +50,17 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	// getters //
 	//=========//
 	
-	/** the largest numerical detail level */
+	/** 
+	 * The largest numerical detail level. <br>
+	 * Detail level is absolute, not section;
+	 * IE 0 = Block, 1 = 2x2 blocks, etc.
+	 */
 	byte lowestDataDetail();
-	/** the smallest numerical detail level */
+	/** 
+	 * The smallest numerical detail level. <br>
+	 * Detail level is absolute, not section;
+	 * IE 0 = Block, 1 = 2x2 blocks, etc.
+	 */
 	byte highestDataDetail();
 	
 	
@@ -81,7 +90,7 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	 */
 	void removeRetrievalRequestIf(DhSectionPos.ICancelablePrimitiveLongConsumer removeIf);
 	
-	CompletableFuture<WorldGenResult> submitGenTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker);
+	CompletableFuture<WorldGenResult> submitRetrievalTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker);
 	
 	
 	
@@ -89,7 +98,10 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	// shutdown //
 	//==========//
 	
-	CompletableFuture<Void> startClosing(boolean cancelCurrentGeneration, boolean alsoInterruptRunning);
+	/** Can be used to let any lingering generation requests finish before fully shutting down the system */
+	CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning);
+	
+	@Override
 	void close();
 	
 	
@@ -104,6 +116,8 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	/** used for rendering to the F3 menu */
 	int getEstimatedTotalTaskCount();
 	void setEstimatedTotalTaskCount(int newEstimate);
+
+	void addDebugMenuStringsToList(List<String> messageList);
 	
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/generation/RemoteWorldRetrievalQueue.java

@@ -0,0 +1,84 @@
+package com.seibel.distanthorizons.core.generation;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.generation.tasks.IWorldGenTaskTracker;
+import com.seibel.distanthorizons.core.generation.tasks.WorldGenResult;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.client.AbstractFullDataNetworkRequestQueue;
+import com.seibel.distanthorizons.core.multiplayer.client.ClientNetworkState;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import org.apache.logging.log4j.Logger;
+
+import java.util.concurrent.*;
+
+public class RemoteWorldRetrievalQueue extends AbstractFullDataNetworkRequestQueue implements IFullDataSourceRetrievalQueue, IDebugRenderable
+{
+	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	
+	private int estimatedTotalTaskCount;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public RemoteWorldRetrievalQueue(ClientNetworkState networkState, IDhClientLevel level)
+	{ super(networkState, level, false, Config.Client.Advanced.Debugging.DebugWireframe.showWorldGenQueue); }
+	
+	
+	
+	//===========================//
+	// retrieval queue overrides //
+	//===========================//
+	
+	@Override
+	public void startAndSetTargetPos(DhBlockPos2D targetPos) { super.tick(targetPos); }
+	
+	@Override
+	public byte lowestDataDetail() { return LodUtil.BLOCK_DETAIL_LEVEL; }
+	@Override
+	public byte highestDataDetail() { return LodUtil.BLOCK_DETAIL_LEVEL; }
+	
+	@Override
+	public CompletableFuture<WorldGenResult> submitRetrievalTask(long sectionPos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
+	{
+		return super.submitRequest(sectionPos, tracker.getDataSourceConsumer())
+				.thenApply(retrievalSuccess -> retrievalSuccess
+						? WorldGenResult.CreateSuccess(sectionPos)
+						: WorldGenResult.CreateFail());
+	}
+	
+	@Override
+	public CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
+	{ return super.startClosingAsync(alsoInterruptRunning); }
+	
+	
+	
+	//=================================//
+	// network request queue overrides //
+	//=================================//
+	
+	@Override
+	protected int getRequestRateLimit() { return this.networkState.sessionConfig.getGenerationRequestRateLimit(); }
+	
+	@Override
+	protected String getQueueName() { return "World Remote Generation Queue"; }
+	
+	
+	
+	//===============//
+	// debug display //
+	//===============//
+	
+	@Override
+	public int getEstimatedTotalTaskCount() { return this.estimatedTotalTaskCount; }
+	@Override
+	public void setEstimatedTotalTaskCount(int newEstimate) { this.estimatedTotalTaskCount = newEstimate; }
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/generation/WorldGenerationQueue.java

@@ -27,7 +27,7 @@ import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSour
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.generation.tasks.*;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.config.Config;
@@ -47,6 +47,7 @@ import org.apache.logging.log4j.Logger;
 
 import java.awt.*;
 import java.util.*;
+import java.util.List;
 import java.util.concurrent.*;
 import java.util.function.Consumer;
 
@@ -141,7 +142,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	//=================//
 	
 	@Override
-	public CompletableFuture<WorldGenResult> submitGenTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
+	public CompletableFuture<WorldGenResult> submitRetrievalTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
 	{
 		// the generator is shutting down, don't add new tasks
 		if (this.generatorClosingFuture != null)
@@ -456,8 +457,8 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 			case VANILLA_CHUNKS: 
 			{
 				return this.generator.generateChunks(
-					chunkPosMin.x,
-					chunkPosMin.z,
+					chunkPosMin.getX(),
+					chunkPosMin.getZ(),
 					granularity,
 					targetDataDetail,
 					generatorMode,
@@ -467,7 +468,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 						try
 						{
 							IChunkWrapper chunk = WRAPPER_FACTORY.createChunkWrapper(generatedObjectArray);
-							FullDataSourceV2 dataSource = LodDataBuilder.createGeneratedDataSource(chunk);
+							FullDataSourceV2 dataSource = LodDataBuilder.createFromChunk(chunk);
 							LodUtil.assertTrue(dataSource != null);
 							chunkDataConsumer.accept(dataSource);
 						}
@@ -482,8 +483,8 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 			case API_CHUNKS: 
 			{
 				return this.generator.generateApiChunks(
-					chunkPosMin.x,
-					chunkPosMin.z,
+					chunkPosMin.getX(),
+					chunkPosMin.getZ(),
 					granularity,
 					targetDataDetail,
 					generatorMode,
@@ -522,8 +523,8 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	// getters / setters //
 	//===================//
 	
-	public int getWaitingTaskCount() { return this.waitingTasks.size(); }
-	public int getInProgressTaskCount() { return this.inProgressGenTasksByLodPos.size(); }
+	@Override public int getWaitingTaskCount() { return this.waitingTasks.size(); }
+	@Override public int getInProgressTaskCount() { return this.inProgressGenTasksByLodPos.size(); }
 	
 	@Override
 	public byte lowestDataDetail() { return this.lowestDataDetail; }
@@ -535,13 +536,15 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	@Override
 	public void setEstimatedTotalTaskCount(int newEstimate) { this.estimatedTotalTaskCount = newEstimate; }
 	
+	@Override public void addDebugMenuStringsToList(List<String> messageList) { }
+	
 	
 	
 	//==========//
 	// shutdown //
 	//==========//
 	
-	public CompletableFuture<Void> startClosing(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
+	@Override public CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
 	{
 		LOGGER.info("Closing world gen queue");
 		this.queueingThread.shutdownNow();
@@ -592,7 +595,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 		
 		if (this.generatorClosingFuture == null)
 		{
-			this.startClosing(true, true);
+			this.startClosingAsync(true, true);
 		}
 		LodUtil.assertTrue(this.generatorClosingFuture != null);
 		
@@ -668,13 +671,17 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 		{
 			index = 4 * X * X - X - Y;
 			if (X < Y)
+			{
 				index = index - 2 * (X - Y);
+			}
 		}
 		else
 		{
 			index = 4 * Y * Y - X - Y;
 			if (X < Y)
+			{
 				index = index + 2 * (X - Y);
+			}
 		}
 		
 		return index;

core/src/main/java/com/seibel/distanthorizons/core/generation/tasks/IWorldGenTaskTracker.java

@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.generation.tasks;
 
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 
+import javax.annotation.Nullable;
 import java.util.function.Consumer;
 
 /**
@@ -32,6 +33,7 @@ public interface IWorldGenTaskTracker
 	/** Returns true if the task hasn't been garbage collected. */
 	boolean isMemoryAddressValid();
 	
-	Consumer<FullDataSourceV2> getChunkDataConsumer();
+	@Nullable
+	Consumer<FullDataSourceV2> getDataSourceConsumer();
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/generation/tasks/WorldGenTaskGroup.java

@@ -51,7 +51,7 @@ public final class WorldGenTaskGroup
 		while (tasks.hasNext())
 		{
 			WorldGenTask task = tasks.next();
-			Consumer<FullDataSourceV2> chunkDataConsumer = task.taskTracker.getChunkDataConsumer();
+			Consumer<FullDataSourceV2> chunkDataConsumer = task.taskTracker.getDataSourceConsumer();
 			if (chunkDataConsumer == null)
 			{
 				tasks.remove();

core/src/main/java/com/seibel/distanthorizons/core/jar/DarkModeDetector.java

@@ -103,9 +103,13 @@ public class DarkModeDetector
 		{
 //            System.out.println(de);
 			if (de.contains("gnome-session")) // Gnome uses GTK
+			{
 				return GTKChecker();
+			}
 			if (de.contains("plasma_session")) // KDE plasma uses QT
+			{
 				return QTChecker();
+			}
 		}
 		return GTKChecker(); // GTK works best with non plasma desktops (desktops includes window managers)
 	}
@@ -134,7 +138,9 @@ public class DarkModeDetector
 			while (themeLine != null)
 			{ // Go through each line till you find "KWinPalette\activeBackground"
 				if (themeLine.contains("KWinPalette\\activeBackground"))
+				{
 					break;
+				}
 				themeLine = reader.readLine();
 			}
 			reader.close();
@@ -145,9 +151,13 @@ public class DarkModeDetector
 			short g = (short) Integer.parseInt("" + themeLine.charAt(index + 3) + themeLine.charAt(index + 4), 16);
 			short b = (short) Integer.parseInt("" + themeLine.charAt(index + 5) + themeLine.charAt(index + 6), 16);
 			if ((r + g + b) / 2 >= 128)
+			{
 				return false;
+			}
 			else
+			{
 				return true;
+			}
 		}
 		catch (Exception e)
 		{
@@ -170,7 +180,9 @@ public class DarkModeDetector
 				while ((actualReadLine = reader.readLine()) != null)
 				{
 					if (stringBuilder.length() != 0)
+					{
 						stringBuilder.append('\n');
+					}
 					stringBuilder.append(actualReadLine);
 				}
 			}

core/src/main/java/com/seibel/distanthorizons/core/level/AbstractDhLevel.java

@@ -22,6 +22,7 @@ package com.seibel.distanthorizons.core.level;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiChunkModifiedEvent;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.DelayedFullDataSourceSaveCache;
+import com.seibel.distanthorizons.core.generation.DhLightingEngine;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
@@ -32,6 +33,7 @@ import com.seibel.distanthorizons.core.sql.dto.BeaconBeamDTO;
 import com.seibel.distanthorizons.core.sql.dto.ChunkHashDTO;
 import com.seibel.distanthorizons.core.sql.repo.BeaconBeamRepo;
 import com.seibel.distanthorizons.core.sql.repo.ChunkHashRepo;
+import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.apache.logging.log4j.Logger;
@@ -40,11 +42,9 @@ import org.jetbrains.annotations.Nullable;
 import java.io.File;
 import java.sql.SQLException;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.atomic.AtomicInteger;
 
 public abstract class AbstractDhLevel implements IDhLevel
 {
@@ -57,7 +57,7 @@ public abstract class AbstractDhLevel implements IDhLevel
 	@Nullable
 	public BeaconBeamRepo beaconBeamRepo;
 	
-	protected final DelayedFullDataSourceSaveCache delayedFullDataSourceSaveCache = new DelayedFullDataSourceSaveCache(this::onDataSourceSave, 2_000);
+	protected final DelayedFullDataSourceSaveCache delayedFullDataSourceSaveCache = new DelayedFullDataSourceSaveCache(this::onDataSourceSave, 500);
 	/** contains the {@link DhChunkPos} for each {@link DhSectionPos} that are queued to save via {@link AbstractDhLevel#delayedFullDataSourceSaveCache} */
 	protected final ConcurrentHashMap<Long, HashSet<DhChunkPos>> updatedChunkPosSetBySectionPos = new ConcurrentHashMap<>();
 	protected final ConcurrentHashMap<DhChunkPos, Integer> updatedChunkHashesByChunkPos = new ConcurrentHashMap<>();
@@ -113,11 +113,15 @@ public abstract class AbstractDhLevel implements IDhLevel
 		GenericObjectRenderer genericRenderer = this.getGenericRenderer();
 		if (genericRenderer != null)
 		{
-			// only add clouds for certain dimension types
-			if (!this.getLevelWrapper().hasCeiling()
-					&& !this.getLevelWrapper().getDimensionType().isTheEnd())
+			// only client levels can render clouds
+			if (this instanceof IDhClientLevel)
 			{
-				this.cloudRenderHandler = new CloudRenderHandler(this, genericRenderer);
+				// only add clouds for certain dimension types
+				if (!this.getLevelWrapper().hasCeiling()
+						&& !this.getLevelWrapper().getDimensionType().isTheEnd())
+				{
+					this.cloudRenderHandler = new CloudRenderHandler((IDhClientLevel)this, genericRenderer);
+				}
 			}
 			
 			
@@ -166,6 +170,12 @@ public abstract class AbstractDhLevel implements IDhLevel
 	
 	private void onDataSourceSave(FullDataSourceV2 fullDataSource)
 	{
+		// block lights should have been populated at the chunkWrapper stage
+		// waiting to populate the data source's skylight at this stage prevents re-lighting and
+		// allows us to reduce cross-chunk lighting issues by lighting the whole 4x4 LOD at once 
+		DhLightingEngine.INSTANCE.bakeDataSourceSkyLight(fullDataSource, this.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
+		
+		
 		this.updateDataSourcesAsync(fullDataSource).thenRun(() -> 
 		{
 			HashSet<DhChunkPos> updatedChunkPosSet = this.updatedChunkPosSetBySectionPos.remove(fullDataSource.getPos());
@@ -182,7 +192,7 @@ public abstract class AbstractDhLevel implements IDhLevel
 					
 					ApiEventInjector.INSTANCE.fireAllEvents(
 							DhApiChunkModifiedEvent.class,
-							new DhApiChunkModifiedEvent.EventParam(this.getLevelWrapper(), chunkPos.x, chunkPos.z));
+							new DhApiChunkModifiedEvent.EventParam(this.getLevelWrapper(), chunkPos.getX(), chunkPos.getZ()));
 				}
 			}
 		});
@@ -215,11 +225,12 @@ public abstract class AbstractDhLevel implements IDhLevel
 	//=================//
 	
 	@Override
-	public void setBeaconBeamsForChunk(DhChunkPos chunkPos, List<BeaconBeamDTO> newBeamList)
+	public void updateBeaconBeamsForChunk(IChunkWrapper chunkToUpdate, ArrayList<IChunkWrapper> nearbyChunkList)
 	{
 		if (this.beaconRenderHandler != null)
 		{
-			this.beaconRenderHandler.setBeaconBeamsForChunk(chunkPos, newBeamList);
+			List<BeaconBeamDTO> activeBeamList = chunkToUpdate.getAllActiveBeacons(nearbyChunkList);
+			this.beaconRenderHandler.setBeaconBeamsForChunk(chunkToUpdate.getChunkPos(), activeBeamList);
 		}
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/level/ClientLevelModule.java

@@ -27,7 +27,7 @@ import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.file.AbstractDataSourceHandler;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.render.LodQuadTree;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
@@ -126,9 +126,9 @@ public class ClientLevelModule implements Closeable, AbstractDataSourceHandler.I
 		
 		boolean isBuffersDirty = false;
 		EDhApiDebugRendering newDebugRendering = Config.Client.Advanced.Debugging.debugRendering.get();
-		if (newDebugRendering != lastDebugRendering)
+		if (newDebugRendering != this.lastDebugRendering)
 		{
-			lastDebugRendering = newDebugRendering;
+			this.lastDebugRendering = newDebugRendering;
 			isBuffersDirty = true;
 		}
 		if (isBuffersDirty)
@@ -225,7 +225,7 @@ public class ClientLevelModule implements Closeable, AbstractDataSourceHandler.I
 		}
 	}
 	
-	public void close()
+	@Override public void close()
 	{
 		// shutdown the renderer
 		ClientRenderState ClientRenderState = this.ClientRenderStateRef.get();

core/src/main/java/com/seibel/distanthorizons/core/level/DhClientLevel.java

@@ -20,15 +20,27 @@
 package com.seibel.distanthorizons.core.level;
 
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
+import com.seibel.distanthorizons.core.config.AppliedConfigState;
+import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.RemoteFullDataSourceProvider;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.multiplayer.client.ClientNetworkState;
+import com.seibel.distanthorizons.core.multiplayer.client.SyncOnLoginRequestQueue;
+import com.seibel.distanthorizons.core.network.event.ScopedNetworkEventSource;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
@@ -36,6 +48,8 @@ import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import org.apache.logging.log4j.Logger;
 import org.jetbrains.annotations.Nullable;
 
+import javax.annotation.CheckForNull;
+import java.awt.*;
 import java.io.File;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
@@ -44,25 +58,58 @@ import java.util.concurrent.CompletableFuture;
 public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
 	public final ClientLevelModule clientside;
 	public final IClientLevelWrapper levelWrapper;
 	public final AbstractSaveStructure saveStructure;
 	public final RemoteFullDataSourceProvider dataFileHandler;
 	
+	@CheckForNull
+	private final ClientNetworkState networkState;
+	@Nullable
+	private final ScopedNetworkEventSource networkEventSource;
+	
+	public final WorldGenModule worldGenModule;
+	public final AppliedConfigState<Boolean> worldGeneratorEnabledConfig;
+	
+	@Nullable
+	private final SyncOnLoginRequestQueue syncOnLoginRequestQueue;
+	
 	
 	
 	//=============//
 	// constructor //
 	//=============//
 	
-	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper) { this(saveStructure, clientLevelWrapper, null, true); }
-	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable File fullDataSaveDirOverride, boolean enableRendering)
+	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable ClientNetworkState networkState) { this(saveStructure, clientLevelWrapper, null, true, networkState); }
+	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable File fullDataSaveDirOverride, boolean enableRendering, @Nullable ClientNetworkState networkState)
 	{
+		if (saveStructure.getFullDataFolder(clientLevelWrapper).mkdirs())
+		{
+			LOGGER.warn("unable to create data folder.");
+		}
 		this.levelWrapper = clientLevelWrapper;
 		this.levelWrapper.setParentLevel(this);
 		this.saveStructure = saveStructure;
-		this.dataFileHandler = new RemoteFullDataSourceProvider(this, saveStructure, fullDataSaveDirOverride);
+		
+		this.networkState = networkState;
+		if (this.networkState != null)
+		{
+			this.networkEventSource = new ScopedNetworkEventSource(this.networkState.getSession());
+			this.syncOnLoginRequestQueue = new SyncOnLoginRequestQueue(this, this.networkState);
+			this.registerNetworkHandlers();
+		}
+		else
+		{
+			this.networkEventSource = null;
+			this.syncOnLoginRequestQueue = null;
+		}
+		
+		this.dataFileHandler = new RemoteFullDataSourceProvider(this, saveStructure, fullDataSaveDirOverride, this.syncOnLoginRequestQueue);
+		this.worldGeneratorEnabledConfig = new AppliedConfigState<>(Config.Client.Advanced.WorldGenerator.enableDistantGeneration);
+		this.worldGenModule = new WorldGenModule(this);
+		
 		this.clientside = new ClientLevelModule(this);
 		
 		this.createAndSetSupportingRepos(this.dataFileHandler.repo.databaseFile);
@@ -74,6 +121,30 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 			LOGGER.info("Started DHLevel for " + this.levelWrapper + " with saves at " + this.saveStructure);
 		}
 	}
+	private void registerNetworkHandlers()
+	{
+		assert this.networkEventSource != null;
+		assert this.networkState != null;
+		
+		this.networkEventSource.registerHandler(FullDataPartialUpdateMessage.class, message ->
+		{
+			try
+			{
+				FullDataSourceV2DTO dataSourceDto = this.networkState.decodeDataSourceAndReleaseBuffer(message.payload);
+				
+				if (!message.isSameLevelAs(this.levelWrapper))
+				{
+					return;
+				}
+				
+				this.updateDataSourcesAsync(dataSourceDto.createPooledDataSource(this.levelWrapper));
+			}
+			catch (Exception e)
+			{
+				LOGGER.error("Error while updating full data source", e);
+			}
+		});
+	}
 	
 	
 	
@@ -87,6 +158,11 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		try
 		{
 			this.clientside.clientTick();
+			
+			if (this.syncOnLoginRequestQueue != null)
+			{
+				this.syncOnLoginRequestQueue.tick(new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos()));
+			}
 		}
 		catch (Exception e)
 		{
@@ -94,6 +170,53 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		}
 	}
 	
+	@Override
+	public void worldGenTick()
+	{
+		ClientNetworkState networkState = this.networkState;
+		
+		boolean isClientUsable = false, isAllowedDimension = false;
+		if (networkState != null)
+		{
+			isClientUsable = networkState.isReady();
+			isAllowedDimension = MC_CLIENT.getWrappedClientLevel() == this.levelWrapper;
+		}
+		
+		boolean shouldDoWorldGen = isClientUsable
+				&& networkState.sessionConfig.isDistantGenerationEnabled()
+				&& isAllowedDimension
+				&& this.clientside.isRendering();
+		
+		boolean isWorldGenRunning = this.worldGenModule.isWorldGenRunning();
+		if (shouldDoWorldGen && !isWorldGenRunning)
+		{
+			// start world gen
+			this.worldGenModule.startWorldGen(this.dataFileHandler, new WorldGenState(this, networkState));
+			
+			// populate the queue based on the current rendering tree
+			ClientLevelModule.ClientRenderState renderState = this.clientside.ClientRenderStateRef.get();
+			renderState.quadtree.leafNodeIterator().forEachRemaining(node -> {
+				this.dataFileHandler.getAsync(node.sectionPos);
+			});
+		}
+		else if (!shouldDoWorldGen && isWorldGenRunning)
+		{
+			// stop world gen
+			this.worldGenModule.stopWorldGen(this.dataFileHandler);
+		}
+		
+		if (this.worldGenModule.isWorldGenRunning())
+		{
+			this.worldGenModule.worldGenTick(new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos()));
+		}
+	}
+	
+	
+	
+	//===========//
+	// rendering //
+	//===========//
+	
 	@Override
 	public void render(DhApiRenderParam renderEventParam, IProfilerWrapper profiler)
 	{ this.clientside.render(renderEventParam, profiler); }
@@ -104,9 +227,28 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 	
 	
 	
-	//================//
-	// level handling //
-	//================//
+	//===========//
+	// world gen //
+	//===========//
+	
+	@Override
+	public void onWorldGenTaskComplete(long pos)
+	{
+		DebugRenderer.makeParticle(
+				new DebugRenderer.BoxParticle(
+						new DebugRenderer.Box(pos, 128f, 156f, 0.09f, Color.red.darker()),
+						0.2, 32f
+				)
+		);
+		
+		this.clientside.reloadPos(pos);
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
 	
 	@Override
 	public int computeBaseColor(DhBlockPos pos, IBiomeWrapper biome, IBlockStateWrapper block) { return this.levelWrapper.getBlockColor(pos, biome, block); }
@@ -126,10 +268,34 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 	@Override
 	public int getMinY() { return this.levelWrapper.getMinHeight(); }
 	
+	@Override
+	public FullDataSourceProviderV2 getFullDataProvider() { return this.dataFileHandler; }
+	
+	@Override
+	public AbstractSaveStructure getSaveStructure() { return this.saveStructure; }
+	
+	@Override
+	public boolean hasSkyLight() { return this.levelWrapper.hasSkyLight(); }
+	
+	@Override
+	public GenericObjectRenderer getGenericRenderer() { return this.clientside.genericRenderer; }
+	@Override
+	public RenderBufferHandler getRenderBufferHandler()
+	{
+		ClientLevelModule.ClientRenderState renderState = this.clientside.ClientRenderStateRef.get();
+		return (renderState != null) ? renderState.renderBufferHandler : null;
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
 	@Override
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
-		String dimName = this.levelWrapper.getDimensionType().getDimensionName();
+		String dimName = this.levelWrapper.getDimensionName();
 		boolean rendering = this.clientside.isRendering();
 		messageList.add("["+dimName+"] rendering: "+(rendering ? "yes" : "no"));
 		
@@ -152,11 +318,39 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		{
 			messageList.add("  Migration Failed");
 		}
+		
+		
+		// world gen
+		this.worldGenModule.addDebugMenuStringsToList(messageList);
+		if (this.syncOnLoginRequestQueue != null)
+		{
+			assert this.networkState != null;
+			if (this.networkState.sessionConfig.getSynchronizeOnLogin())
+			{
+				this.syncOnLoginRequestQueue.addDebugMenuStringsToList(messageList);
+			}
+		}
 	}
 	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
 	@Override
 	public void close()
 	{
+		if (this.worldGenModule != null)
+		{
+			this.worldGenModule.close();
+		}
+		
+		if (this.networkEventSource != null)
+		{
+			this.networkEventSource.close();
+		}
+		
 		this.levelWrapper.setParentLevel(null);
 		this.clientside.close();
 		super.close();
@@ -164,23 +358,18 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		LOGGER.info("Closed [" + DhClientLevel.class.getSimpleName() + "] for [" + this.levelWrapper + "]");
 	}
 	
-	@Override
-	public FullDataSourceProviderV2 getFullDataProvider() { return this.dataFileHandler; }
-	
-	@Override
-	public AbstractSaveStructure getSaveStructure() { return this.saveStructure; }
-	
-	@Override
-	public boolean hasSkyLight() { return this.levelWrapper.hasSkyLight(); }
 	
 	
-	@Override
-	public GenericObjectRenderer getGenericRenderer() { return this.clientside.genericRenderer; }
-	@Override
-	public RenderBufferHandler getRenderBufferHandler()
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class WorldGenState extends WorldGenModule.AbstractWorldGenState
 	{
-		ClientLevelModule.ClientRenderState renderState = this.clientside.ClientRenderStateRef.get();
-		return (renderState != null) ? renderState.renderBufferHandler : null;
+		WorldGenState(IDhClientLevel level, ClientNetworkState networkState)
+		{
+			this.worldGenerationQueue = new RemoteWorldRetrievalQueue(networkState, level);
+		}
 	}
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/level/DhClientServerLevel.java

@@ -28,8 +28,8 @@ import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
@@ -98,7 +98,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void serverTick() {  }
 	
 	@Override
-	public void doWorldGen()
+	public void worldGenTick()
 	{
 		this.serverside.worldGeneratorEnabledConfig.pollNewValue(); // if not called the get() line below may not 
 		boolean shouldDoWorldGen = this.serverside.worldGeneratorEnabledConfig.get() && this.clientside.isRendering();
@@ -157,9 +157,9 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void clearRenderCache() { this.clientside.clearRenderCache(); }
 	
 	@Override
-	public IServerLevelWrapper getServerLevelWrapper() { return serverLevelWrapper; }
+	public IServerLevelWrapper getServerLevelWrapper() { return this.serverLevelWrapper; }
 	@Override
-	public ILevelWrapper getLevelWrapper() { return getServerLevelWrapper(); }
+	public ILevelWrapper getLevelWrapper() { return this.getServerLevelWrapper(); }
 	
 	@Override
 	public FullDataSourceProviderV2 getFullDataProvider() { return this.serverside.fullDataFileHandler; }
@@ -167,7 +167,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	@Override
 	public AbstractSaveStructure getSaveStructure()
 	{
-		return serverside.saveStructure;
+		return this.serverside.saveStructure;
 	}
 	
 	@Override
@@ -189,7 +189,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
 		// header
-		String dimName = this.serverLevelWrapper.getDimensionType().getDimensionName();
+		String dimName = this.serverLevelWrapper.getDimensionName();
 		boolean rendering = this.clientside.isRendering();
 		messageList.add("["+dimName+"] rendering: "+(rendering ? "yes" : "no"));
 		
@@ -216,12 +216,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 		
 		
 		// world gen
-		WorldGenModule worldGenState = this.serverside.worldGenModule;
-		String worldGenDisplayString = worldGenState.getDebugMenuString();
-		if (worldGenDisplayString != null)
-		{
-			messageList.add(worldGenDisplayString);
-		}
+		this.serverside.worldGenModule.addDebugMenuStringsToList(messageList);
 	}
 	
 	

core/src/main/java/com/seibel/distanthorizons/core/level/DhServerLevel.java

@@ -19,33 +19,73 @@
 
 package com.seibel.distanthorizons.core.level;
 
+import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.server.RemotePlayerConnectionHandler;
+import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerState;
+import com.seibel.distanthorizons.core.network.exceptions.InvalidLevelException;
+import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
+import com.seibel.distanthorizons.core.network.messages.ILevelRelatedMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPayload;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.util.math.Vec3d;
+import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import javax.annotation.CheckForNull;
 import java.util.List;
-import java.util.concurrent.CompletableFuture;
+import java.util.Map;
+import java.util.concurrent.*;
 
 public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	private static final ConfigBasedLogger NETWORK_LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	/** 1 Mebibyte minus 576 bytes for other info */
+	public static final int FULL_DATA_SPLIT_SIZE_IN_BYTES = 1_048_000;
+	
 	public final ServerLevelModule serverside;
 	private final IServerLevelWrapper serverLevelWrapper;
 	
+	private final RemotePlayerConnectionHandler remotePlayerConnectionHandler;
+	
+	/**
+	 * This queue is used for ensuring fair generation speed for each player. <br>
+	 * Every tick the first player gets used for centering generation, and then is immediately moved into the back of the queue. <br>
+	 * TODO only add players that actually have something to generate
+	 */
+	private final ConcurrentLinkedQueue<IServerPlayerWrapper> worldGenPlayerCenteringQueue = new ConcurrentLinkedQueue<>();
+	
+	private final ConcurrentMap<Long, DataSourceRequestGroup> requestGroupByPos = new ConcurrentHashMap<>();
+	private final ConcurrentMap<Long, DataSourceRequestGroup> requestGroupByFutureId = new ConcurrentHashMap<>();
+	
 	
 	
 	//=============//
 	// constructor //
 	//=============//
 	
-	public DhServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper)
+	public DhServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper, RemotePlayerConnectionHandler remotePlayerConnectionHandler)
 	{
 		if (saveStructure.getFullDataFolder(serverLevelWrapper).mkdirs())
 		{
@@ -56,77 +96,393 @@ public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 		this.createAndSetSupportingRepos(this.serverside.fullDataFileHandler.repo.databaseFile);
 		this.runRepoReliantSetup();
 		
-		LOGGER.info("Started DHLevel for {} with saves at {}", serverLevelWrapper, saveStructure);
+		LOGGER.info("Started DHLevel for ["+serverLevelWrapper+"] at ["+saveStructure+"].");
+	
+		this.remotePlayerConnectionHandler = remotePlayerConnectionHandler;
 	}
 	
 	
 	
-	//=========//
-	// methods //
-	//=========//
-	
-	public void serverTick() {  }
+	//=======//
+	// ticks //
+	//=======//
 	
 	@Override
-	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data) { return this.getFullDataProvider().updateDataSourceAsync(data); }
-	
-	@Override
-	public int getMinY() { return getLevelWrapper().getMinHeight(); }
-	
-	@Override
-	public void close()
+	public void serverTick()
 	{
-		super.close();
-		serverside.close();
-		LOGGER.info("Closed DHLevel for {}", getLevelWrapper());
+		// Send finished data source requests
+		for (Map.Entry<Long, DataSourceRequestGroup> entry : this.requestGroupByPos.entrySet())
+		{
+			DataSourceRequestGroup requestGroup = entry.getValue();
+			
+			if (requestGroup.fullDataSource == null)
+			{
+				continue;
+			}
+			
+			NETWORK_LOGGER.debug("["+this.serverLevelWrapper.getDimensionName()+"] Fulfilled request group ["+entry.getKey()+"]");
+			
+			// Make this group unavailable for adding into
+			this.requestGroupByPos.remove(entry.getKey());
+			requestGroup.requestRemoveSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+			requestGroup.requestAddSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+			
+			ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+			if (executor == null)
+			{
+				LOGGER.warn("Unable to send FullDataSourceResponseMessage - getNetworkCompressionExecutor() is null");
+				continue;
+			}
+			CompletableFuture.runAsync(() ->
+			{
+				FullDataPayload payload = new FullDataPayload(requestGroup.fullDataSource);
+				for (FullDataSourceRequestMessage msg : requestGroup.requestMessages.values())
+				{
+					this.requestGroupByFutureId.remove(msg.futureId);
+					
+					ServerPlayerState serverPlayerState = this.remotePlayerConnectionHandler.getConnectedPlayer(msg.serverPlayer());
+					if (serverPlayerState == null)
+					{
+						continue;
+					}
+					
+					serverPlayerState.getRateLimiterSet(this).generationRequestRateLimiter.release();
+					payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, msg.getSession()::sendMessage);
+					msg.sendResponse(new FullDataSourceResponseMessage(payload));
+				}
+			}, executor);
+		}
 	}
 	
 	@Override
-	public void doWorldGen()
+	public void worldGenTick()
 	{
 		boolean shouldDoWorldGen = true; //todo;
-		boolean isWorldGenRunning = serverside.worldGenModule.isWorldGenRunning();
+		boolean isWorldGenRunning = this.serverside.worldGenModule.isWorldGenRunning();
 		if (shouldDoWorldGen && !isWorldGenRunning)
 		{
 			// start world gen
-			serverside.worldGenModule.startWorldGen(serverside.fullDataFileHandler, new ServerLevelModule.WorldGenState(this));
+			this.serverside.worldGenModule.startWorldGen(this.serverside.fullDataFileHandler, new ServerLevelModule.WorldGenState(this));
 		}
 		else if (!shouldDoWorldGen && isWorldGenRunning)
 		{
 			// stop world gen
-			serverside.worldGenModule.stopWorldGen(serverside.fullDataFileHandler);
+			this.serverside.worldGenModule.stopWorldGen(this.serverside.fullDataFileHandler);
 		}
 		
-		if (serverside.worldGenModule.isWorldGenRunning())
+		if (this.serverside.worldGenModule.isWorldGenRunning())
 		{
-			serverside.worldGenModule.worldGenTick(new DhBlockPos2D(0, 0)); // todo;
+			IServerPlayerWrapper firstPlayer = this.worldGenPlayerCenteringQueue.peek();
+			if (firstPlayer == null)
+			{
+				return;
+			}
+			
+			// Put first player in back before removing from front, so it can be removed by other thread without blocking
+			// - if it gets removed, remove() below will remove the item we just put instead
+			this.worldGenPlayerCenteringQueue.add(firstPlayer);
+			this.worldGenPlayerCenteringQueue.remove(firstPlayer);
+			
+			Vec3d position = firstPlayer.getPosition();
+			this.serverside.worldGenModule.worldGenTick(new DhBlockPos2D((int) position.x, (int) position.z));
 		}
 	}
 	
-	@Override
-	public IServerLevelWrapper getServerLevelWrapper() { return serverLevelWrapper; }
+	
+	
+	//==================//
+	// network handling //
+	//==================//
+	
+	public void registerNetworkHandlers(ServerPlayerState serverPlayerState)
+	{
+		serverPlayerState.networkSession.registerHandler(FullDataSourceRequestMessage.class, (message) ->
+		{
+			if (!this.messagePlayerInThisLevel(message))
+			{
+				// we can't handle players in other levels, don't continue
+				return;
+			}
+			
+			
+			ServerPlayerState.RateLimiterSet rateLimiterSet = serverPlayerState.getRateLimiterSet(this);
+			
+			if (message.clientTimestamp == null)
+			{
+				this.queueWorldGenForRequestMessage(serverPlayerState, message, rateLimiterSet);
+			}
+			else
+			{
+				this.queueLodSyncForRequestMessage(serverPlayerState, message, rateLimiterSet);
+			}
+		});
+		
+		
+		serverPlayerState.networkSession.registerHandler(CancelMessage.class, msg ->
+		{
+			DataSourceRequestGroup requestGroup = this.requestGroupByFutureId.remove(msg.futureId);
+			if (requestGroup == null)
+			{
+				return;
+			}
+			
+			// If this fails, the group is being removed and completing cancellation is not necessary
+			if (requestGroup.requestRemoveSemaphore.tryAcquire())
+			{
+				// Prevent adding requests in case the group will be removed by this cancellation
+				requestGroup.requestAddSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+				requestGroup.requestRemoveSemaphore.release();
+				
+				serverPlayerState.getRateLimiterSet(this).generationRequestRateLimiter.release();
+				
+				FullDataSourceRequestMessage requestMessage = requestGroup.requestMessages.remove(msg.futureId);
+				if (requestGroup.requestMessages.isEmpty())
+				{
+					NETWORK_LOGGER.debug("["+this.serverLevelWrapper.getDimensionName()+"] Cancelled request group ["+DhSectionPos.toString(requestMessage.sectionPos)+"].");
+					this.requestGroupByPos.remove(requestMessage.sectionPos);
+					this.serverside.fullDataFileHandler.removeRetrievalRequestIf(pos -> pos == requestMessage.sectionPos);
+				}
+				else
+				{
+					requestGroup.requestAddSemaphore.release(Short.MAX_VALUE);
+				}
+			}
+		});
+	}
+	private void queueLodSyncForRequestMessage(ServerPlayerState serverPlayerState, FullDataSourceRequestMessage message, ServerPlayerState.RateLimiterSet rateLimiterSet)
+	{
+		if (!serverPlayerState.sessionConfig.getSynchronizeOnLogin())
+		{
+			message.sendResponse(new RequestRejectedException("Operation is disabled in config."));
+			return;
+		}
+		
+		if (!rateLimiterSet.syncOnLoginRateLimiter.tryAcquire(message))
+		{
+			return;
+		}
+		
+		
+		// the client timestamp will be null if we want to retrieve the LOD regardless of when it was last updated
+		long clientTimestamp = (message.clientTimestamp != null) ? message.clientTimestamp : -1;
+		// the server timestamp will be null if no LOD data exists for this position
+		Long serverTimestamp = this.serverside.fullDataFileHandler.getTimestampForPos(message.sectionPos);
+		if (serverTimestamp == null 
+			|| serverTimestamp <= clientTimestamp)
+		{
+			// either no data exists to sync, or the client is already up to date
+			rateLimiterSet.syncOnLoginRateLimiter.release();
+			message.sendResponse(new FullDataSourceResponseMessage(null));
+			return;
+		}
+		
+		
+		
+		ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+		if (executor == null)
+		{
+			// shouldn't normally happen, but just in case
+			LOGGER.warn("Unable to send FullDataSourceResponseMessage - getNetworkCompressionExecutor() is null");
+			return;
+		}
+		
+		this.serverside.fullDataFileHandler.getAsync(message.sectionPos).thenAcceptAsync(fullDataSource ->
+		{
+			rateLimiterSet.syncOnLoginRateLimiter.release();
+			
+			FullDataPayload payload = new FullDataPayload(fullDataSource);
+			payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, message.getSession()::sendMessage);
+			message.sendResponse(new FullDataSourceResponseMessage(payload));
+		}, executor);
+	}
+	private void queueWorldGenForRequestMessage(ServerPlayerState serverPlayerState, FullDataSourceRequestMessage message, ServerPlayerState.RateLimiterSet rateLimiterSet)
+	{
+		if (!serverPlayerState.sessionConfig.isDistantGenerationEnabled())
+		{
+			message.sendResponse(new RequestRejectedException("Operation is disabled in config."));
+			return;
+		}
+		
+		if (!rateLimiterSet.generationRequestRateLimiter.tryAcquire(message))
+		{
+			return;
+		}
+		
+		while (true)
+		{
+			DataSourceRequestGroup requestGroup = this.requestGroupByPos.computeIfAbsent(message.sectionPos, pos ->
+			{
+				DataSourceRequestGroup newGroup = new DataSourceRequestGroup();
+				this.tryFulfillDataSourceRequestGroup(newGroup, pos);
+				NETWORK_LOGGER.debug("["+this.serverLevelWrapper.getDimensionName()+"] Created request group for pos ["+DhSectionPos.toString(pos)+"].");
+				return newGroup;
+			});
+			
+			// If this fails, loop until either a permit is acquired or the group is removed to create another one
+			if (!requestGroup.requestAddSemaphore.tryAcquire())
+			{
+				Thread.yield();
+				continue;
+			}
+			
+			this.requestGroupByFutureId.put(message.futureId, requestGroup);
+			requestGroup.requestMessages.put(message.futureId, message);
+			requestGroup.requestAddSemaphore.release();
+			break;
+		}
+	}
+	
+	
+	/** May send an error message in response if the message is a {@link AbstractTrackableMessage} */
+	private <T extends AbstractNetworkMessage> boolean messagePlayerInThisLevel(T message)
+	{
+		if (!(message instanceof ILevelRelatedMessage))
+		{
+			LodUtil.assertNotReach("Received message ["+ILevelRelatedMessage.class.getSimpleName()+"] does not implement ["+message.getClass().getSimpleName()+"]");
+		}
+		
+		// Only handle requests for this level
+		if (!((ILevelRelatedMessage) message).isSameLevelAs(this.getServerLevelWrapper()))
+		{
+			return false;
+		}
+		
+		LodUtil.assertTrue(message.getSession().serverPlayer != null);
+		
+		// Check if the player is in this dimension,
+		// since handling multiple dimensions isn't allowed
+		if (message.getSession().serverPlayer.getLevel() != this.getLevelWrapper())
+		{
+			// If the message can be replied to - reply with an error, otherwise just ignore
+			if (message instanceof AbstractTrackableMessage)
+			{
+				((AbstractTrackableMessage) message).sendResponse(
+					new InvalidLevelException(
+						"Generation not allowed. " +
+						"Requested dimension: ["+((ILevelRelatedMessage) message).getLevelName()+"], " +
+						"player dimension: ["+message.getSession().serverPlayer.getLevel().getDimensionName()+"], " +
+						"handler dimension: ["+this.getLevelWrapper().getDimensionName()+"]"
+					)
+				);
+			}
+			
+			return false;
+		}
+		
+		
+		return true;
+	}
+	
+	
+	
+	//===========//
+	// world gen //
+	//===========//
 	
 	@Override
-	public ILevelWrapper getLevelWrapper() { return getServerLevelWrapper(); }
+	public void onWorldGenTaskComplete(long pos)
+	{
+		DataSourceRequestGroup requestGroup = this.requestGroupByPos.get(pos);
+		if (requestGroup != null)
+		{
+			this.tryFulfillDataSourceRequestGroup(requestGroup, pos);
+		}
+	}
+	
+	private void tryFulfillDataSourceRequestGroup(DataSourceRequestGroup requestGroup, long pos)
+	{
+		this.serverside.fullDataFileHandler.getAsync(pos).thenAccept(fullDataSource -> 
+		{
+			if (this.serverside.fullDataFileHandler.isFullyGenerated(fullDataSource.columnGenerationSteps))
+			{
+				requestGroup.fullDataSource = fullDataSource;
+			}
+			else
+			{
+				this.serverside.fullDataFileHandler.queuePositionForRetrieval(pos);
+			}
+		});
+	}
+	
+	
+	
+	//=================//
+	// player handling //
+	//=================//
+	
+	public void addPlayer(IServerPlayerWrapper serverPlayer) { this.worldGenPlayerCenteringQueue.add(serverPlayer); }
+	public void removePlayer(IServerPlayerWrapper serverPlayer) { this.worldGenPlayerCenteringQueue.remove(serverPlayer); }
+	
+	
+	
+	@Override
+	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data)
+	{
+		if (!Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates.get())
+		{
+			return this.getFullDataProvider().updateDataSourceAsync(data);
+		}
+		
+		ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+		if (executor == null)
+		{
+			LOGGER.warn("Unable to send FullDataPartialUpdateMessage - getNetworkCompressionExecutor() is null");
+			return this.getFullDataProvider().updateDataSourceAsync(data);
+		}
+		CompletableFuture.runAsync(() ->
+		{
+			FullDataPayload payload = new FullDataPayload(data);
+			for (ServerPlayerState serverPlayerState : this.remotePlayerConnectionHandler.getConnectedPlayers())
+			{
+				if (serverPlayerState.getServerPlayer().getLevel() != this.serverLevelWrapper)
+				{
+					continue;
+				}
+				
+				if (!serverPlayerState.sessionConfig.isRealTimeUpdatesEnabled())
+				{
+					continue;
+				}
+				
+				Vec3d playerPosition = serverPlayerState.getServerPlayer().getPosition();
+				int distanceFromPlayer = DhSectionPos.getManhattanBlockDistance(data.getPos(), new DhBlockPos2D((int) playerPosition.x, (int) playerPosition.z)) / 16;
+				if (distanceFromPlayer >= serverPlayerState.getServerPlayer().getViewDistance() 
+					&& distanceFromPlayer <= serverPlayerState.sessionConfig.getRenderDistanceRadius())
+				{
+					payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, serverPlayerState.networkSession::sendMessage);
+					serverPlayerState.networkSession.sendMessage(new FullDataPartialUpdateMessage(this.serverLevelWrapper, payload));
+				}
+			}
+		}, executor);
+		
+		
+		return this.getFullDataProvider().updateDataSourceAsync(data);
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Override
+	public int getMinY() { return this.getLevelWrapper().getMinHeight(); }
+	
+	@Override
+	public IServerLevelWrapper getServerLevelWrapper() { return this.serverLevelWrapper; }
+	
+	@Override
+	public ILevelWrapper getLevelWrapper() { return this.getServerLevelWrapper(); }
 	
 	@Override
 	public FullDataSourceProviderV2 getFullDataProvider() { return this.serverside.fullDataFileHandler; }
 	
 	@Override
-	public AbstractSaveStructure getSaveStructure()
-	{
-		return serverside.saveStructure;
-	}
+	public AbstractSaveStructure getSaveStructure() { return this.serverside.saveStructure; }
 	
 	@Override
 	public boolean hasSkyLight() { return this.serverLevelWrapper.hasSkyLight(); }
 	
-	@Override
-	public void onWorldGenTaskComplete(long pos)
-	{
-		//TODO: Send packet to client
-	}
-	
 	@Override
 	public GenericObjectRenderer getGenericRenderer() 
 	{ 
@@ -141,6 +497,7 @@ public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 	}
 	
 	
+	
 	//===========//
 	// debugging //
 	//===========//
@@ -148,8 +505,48 @@ public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 	@Override
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
-		String dimName = this.serverLevelWrapper.getDimensionType().getDimensionName();
+		String dimName = this.serverLevelWrapper.getDimensionName();
 		messageList.add("["+dimName+"]");
 	}
 	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		super.close();
+		this.serverside.close();
+		LOGGER.info("Closed DHLevel for ["+this.getLevelWrapper()+"].");
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class DataSourceRequestGroup
+	{
+		public final ConcurrentMap<Long, FullDataSourceRequestMessage> requestMessages = new ConcurrentHashMap<>();
+
+		@CheckForNull
+		public FullDataSourceV2 fullDataSource;
+		
+		/**
+		 * These semaphores prevent a given thread from accidentally locking on the same group
+		 * multiple times, as the semaphore is tied to the given thread. <br>
+		 * Reentrant Lock isn't used since it would allow the thread to lock on the same group. <br>
+		 * the Short.MAX_VALUE is just a very large number that should be larger than the number of
+		 * threads we'll have.
+		 */
+		public final Semaphore requestAddSemaphore = new Semaphore(Short.MAX_VALUE, true);
+		/** @see DataSourceRequestGroup#requestAddSemaphore */
+		public final Semaphore requestRemoveSemaphore = new Semaphore(Short.MAX_VALUE, true);
+		
+	}
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/level/IDhClientLevel.java

@@ -20,7 +20,7 @@
 package com.seibel.distanthorizons.core.level;
 
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
-import com.seibel.distanthorizons.core.pos.DhBlockPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;

core/src/main/java/com/seibel/distanthorizons/core/level/IDhLevel.java

@@ -21,20 +21,23 @@ package com.seibel.distanthorizons.core.level;
 
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
+import com.seibel.distanthorizons.core.file.fullDatafile.GeneratedFullDataSourceProvider;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
-import com.seibel.distanthorizons.core.sql.dto.BeaconBeamDTO;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
 
-public interface IDhLevel extends AutoCloseable
+public interface IDhLevel extends AutoCloseable, GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener
 {
+	void worldGenTick();
+	
 	int getMinY();
 	
 	/**
@@ -48,7 +51,7 @@ public interface IDhLevel extends AutoCloseable
 	void updateChunkAsync(IChunkWrapper chunk, int newChunkHash);
 	
 	void loadBeaconBeamsInPos(long pos);
-	void setBeaconBeamsForChunk(DhChunkPos chunkPos, List<BeaconBeamDTO> beamList);
+	void updateBeaconBeamsForChunk(IChunkWrapper chunkToUpdate, ArrayList<IChunkWrapper> nearbyChunkList);
 	void unloadBeaconBeamsInPos(long pos);
 	
 	FullDataSourceProviderV2 getFullDataProvider();

core/src/main/java/com/seibel/distanthorizons/core/level/IDhServerLevel.java

@@ -21,9 +21,10 @@ package com.seibel.distanthorizons.core.level;
 
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
 
-public interface IDhServerLevel extends IDhWorldGenLevel
+public interface IDhServerLevel extends IDhLevel
 {
     void serverTick();
 	
     IServerLevelWrapper getServerLevelWrapper();
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/level/IKeyedClientLevelManager.java

@@ -19,7 +19,7 @@
 
 package com.seibel.distanthorizons.core.level;
 
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.coreapi.interfaces.dependencyInjection.IBindable;
 
 /**
@@ -28,15 +28,11 @@ import com.seibel.distanthorizons.coreapi.interfaces.dependencyInjection.IBindab
  */
 public interface IKeyedClientLevelManager extends IBindable
 {
+	IServerKeyedClientLevel getServerKeyedLevel();
 	/** Called when a client level is wrapped by a ServerEnhancedClientLevel, for integration into mod internals. */
-	void setServerKeyedLevel(IServerKeyedClientLevel clientLevel);
-	IServerKeyedClientLevel getOverrideWrapper();
+	IServerKeyedClientLevel setServerKeyedLevel(IClientLevelWrapper clientLevel, String levelKey);
 	
-	/** Returns a new instance of a ServerEnhancedClientLevel. */
-	IServerKeyedClientLevel getServerKeyedLevel(ILevelWrapper level, String serverLevelKey);
-	
-	/** Sets the LOD engine to use the override wrapper, if the server has communication enabled. */
-	void setUseOverrideWrapper(boolean useOverrideWrapper);
-	boolean getUseOverrideWrapper();
+	void clearKeyedLevel();
+	boolean hasLevelSet();
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/level/WorldGenModule.java

@@ -23,13 +23,18 @@ import com.seibel.distanthorizons.core.file.fullDatafile.GeneratedFullDataSource
 import com.seibel.distanthorizons.core.generation.IFullDataSourceRetrievalQueue;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.logging.f3.F3Screen;
-import com.seibel.distanthorizons.core.pos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import org.apache.logging.log4j.Logger;
 
 import java.io.Closeable;
+import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicReference;
 
+/**
+ * Handles both single-player/server-side world gen and client side LOD requests.
+ * TODO rename
+ */
 public class WorldGenModule implements Closeable
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
@@ -137,20 +142,22 @@ public class WorldGenModule implements Closeable
 	
 	public boolean isWorldGenRunning() { return this.worldGenStateRef.get() != null; }
 	
-	public String getDebugMenuString()
+	/** mutates a list so it can be added to an existing {@link IDhLevel}'s debug list  */
+	public void addDebugMenuStringsToList(List<String> messageList)
 	{
 		AbstractWorldGenState worldGenState = this.worldGenStateRef.get();
 		if (worldGenState == null)
 		{
-			return null;
+			return;
 		}
 		
 		
 		String waitingCountStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getWaitingTaskCount());
 		String inProgressCountStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getInProgressTaskCount());
 		String totalCountEstimateStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getEstimatedTotalTaskCount());
-		
-		return "World Gen Tasks: "+waitingCountStr+"/"+totalCountEstimateStr+" (in progress: "+inProgressCountStr+")";
+		messageList.add("World Gen Tasks: "+waitingCountStr+"/"+totalCountEstimateStr+" (in progress: "+inProgressCountStr+")");
+
+		worldGenState.worldGenerationQueue.addDebugMenuStringsToList(messageList);
 	}
 	
 	
@@ -166,18 +173,18 @@ public class WorldGenModule implements Closeable
 		
 		CompletableFuture<Void> closeAsync(boolean doInterrupt)
 		{
-			return this.worldGenerationQueue.startClosing(true, doInterrupt)
-					.exceptionally(ex ->
-							{
-								LOGGER.error("Error closing generation queue", ex);
-								return null;
-							}
-					).thenRun(this.worldGenerationQueue::close)
-					.exceptionally(ex ->
-					{
-						LOGGER.error("Error closing world gen", ex);
-						return null;
-					});
+			return this.worldGenerationQueue.startClosingAsync(true, doInterrupt)
+				.exceptionally(e ->
+				{
+					LOGGER.error("Error during first stage of generation queue shutdown, Error: ["+e.getMessage()+"].", e);
+					return null;
+				}
+				).thenRun(this.worldGenerationQueue::close)
+				.exceptionally(e ->
+				{
+					LOGGER.error("Error during second stage of generation queue shutdown, Error: ["+e.getMessage()+"].", e);
+					return null;
+				});
 		}
 		
 		/** @param targetPosForGeneration the position that world generation should be centered around */

core/src/main/java/com/seibel/distanthorizons/core/logging/ConfigBasedLogger.java

@@ -101,7 +101,8 @@ public class ConfigBasedLogger
 			else
 				logger.log(logLevel, msgStr);
 		}
-		if (mode.levelForChat.isLessSpecificThan(level))
+		
+		if (MC != null && mode.levelForChat.isLessSpecificThan(level))
 		{
 			if (param.length > 0 && param[param.length - 1] instanceof Throwable)
 				MC.logToChat(level, msgStr + "\n" +

core/src/main/java/com/seibel/distanthorizons/core/logging/f3/F3Screen.java

@@ -20,12 +20,14 @@
 package com.seibel.distanthorizons.core.logging.f3;
 
 import com.seibel.distanthorizons.core.api.internal.SharedApi;
+import com.seibel.distanthorizons.core.jar.ModJarInfo;
 import com.seibel.distanthorizons.core.level.IDhLevel;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.coreapi.ModInfo;
+import com.seibel.distanthorizons.coreapi.util.StringUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -48,7 +50,8 @@ public class F3Screen
 	/**
 	 * F3 menu example: <br>
 	 <code>
-	 Distant Horizons v: 2.1.1-a-dev <br><br>
+	 Distant Horizons v: 2.1.1-a-dev <br> 
+	 Build: 7e163ce6 (main) <br><br>
 	 
 	 Queued chunk updates: 0 / 1000 <br>
 	 World Gen Tasks: 40/5304, (in progress: 7) <br><br>
@@ -60,9 +63,9 @@ public class F3Screen
 	 Parent Update #: 12 <br><br>
 	 
 	 Client_Server World with 3 levels <br>
-	 [overworld] rendering: Active <br>
-	 [the_end] rendering: Inactive <br>
-	 [the_nether] rendering: Inactive <br><br>
+	 [minecraft:overworld] rendering: Active <br>
+	 [minecraft:the_end] rendering: Inactive <br>
+	 [minecraft:the_nether] rendering: Inactive <br><br>
 	 
 	 VBO Render Count: 199/374 <br>
 	 </code>
@@ -72,6 +75,7 @@ public class F3Screen
 		ThreadPoolExecutor worldGenPool = ThreadPoolUtil.getWorldGenExecutor();
 		ThreadPoolExecutor fileHandlerPool = ThreadPoolUtil.getFileHandlerExecutor();
 		ThreadPoolExecutor updatePool = ThreadPoolUtil.getUpdatePropagatorExecutor();
+		ThreadPoolExecutor lodBuilderPool = ThreadPoolUtil.getChunkToLodBuilderExecutor();
 		ThreadPoolExecutor bufferBuilderPool = ThreadPoolUtil.getBufferBuilderExecutor();
 		ThreadPoolExecutor bufferUploaderPool = ThreadPoolUtil.getBufferUploaderExecutor();
 		
@@ -81,11 +85,16 @@ public class F3Screen
 		
 		messageList.add("");
 		messageList.add(ModInfo.READABLE_NAME+": "+ModInfo.VERSION);
+		if (ModInfo.IS_DEV_BUILD)
+		{
+			messageList.add("Build: " + StringUtil.shortenString(ModJarInfo.Git_Commit, 8) + " (" + ModJarInfo.Git_Branch + ")");
+		}
 		messageList.add("");
 		// thread pools
 		messageList.add(getThreadPoolStatString("World Gen", worldGenPool));//"World Gen Tasks: 40/5304, (in progress: 7)");
 		messageList.add(getThreadPoolStatString("File Handler", fileHandlerPool));
 		messageList.add(getThreadPoolStatString("Update Propagator", updatePool));
+		messageList.add(getThreadPoolStatString("LOD Builder", lodBuilderPool));
 		messageList.add(getThreadPoolStatString("Buffer Builder", bufferBuilderPool));
 		messageList.add(getThreadPoolStatString("Buffer Uploader", bufferUploaderPool));
 		messageList.add("");
@@ -93,7 +102,7 @@ public class F3Screen
 		messageList.add(SharedApi.INSTANCE.getDebugMenuString());
 		messageList.add("");
 		// world / levels
-		messageList.add(world.GetDebugMenuString());
+		world.addDebugMenuStringsToList(messageList);
 		for (IDhLevel level : levelIterator)
 		{
 			level.addDebugMenuStringsToList(messageList);

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/client/AbstractFullDataNetworkRequestQueue.java

@@ -0,0 +1,415 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.google.common.base.Stopwatch;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.types.ConfigEntry;
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.DhServerLevel;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.logging.ConfigBasedSpamLogger;
+import com.seibel.distanthorizons.core.network.exceptions.InvalidLevelException;
+import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
+import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
+import com.seibel.distanthorizons.core.network.session.SessionClosedException;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.util.TimerUtil;
+import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
+import com.seibel.distanthorizons.core.util.ratelimiting.SupplierBasedRateLimiter;
+import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import org.apache.logging.log4j.LogManager;
+
+import javax.annotation.CheckForNull;
+import javax.annotation.Nullable;
+import java.awt.*;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Consumer;
+
+public abstract class AbstractFullDataNetworkRequestQueue implements IDebugRenderable, AutoCloseable
+{
+	private static final ConfigBasedSpamLogger LOGGER = new ConfigBasedSpamLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get(), 3);
+	
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
+	private static final Timer TASK_FINISH_TIMER = TimerUtil.CreateTimer("RequestTaskFinishTimer");
+	
+	private static final int MAX_RETRY_ATTEMPTS = 3;
+	
+	protected static final long SHUTDOWN_TIMEOUT_SECONDS = 5;
+	
+	
+	
+	public final ClientNetworkState networkState;
+	protected final IDhClientLevel level;
+	private final boolean changedOnly;
+	
+	private volatile CompletableFuture<Void> closingFuture = null;
+	
+	protected final ConcurrentMap<Long, RequestQueueEntry> waitingTasksBySectionPos = new ConcurrentHashMap<>();
+	/**
+	 * This semaphore prevents a given thread from accidentally locking on the same group
+	 * multiple times, as the semaphore is tied to the given thread. <br>
+	 * Reentrant Lock isn't used since it would allow the thread to lock on the same group. <br>
+	 * the Short.MAX_VALUE is just a very large number that should be larger than the number of
+	 * threads we'll have.
+	 */
+	private final Semaphore pendingTasksSemaphore = new Semaphore(Short.MAX_VALUE, true);
+	
+	private final AtomicInteger finishedRequests = new AtomicInteger();
+	private final AtomicInteger failedRequests = new AtomicInteger();
+	private final ConfigEntry<Boolean> showDebugWireframeConfig;
+	
+	private final SupplierBasedRateLimiter<Void> rateLimiter = new SupplierBasedRateLimiter<>(this::getRequestRateLimit);
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public AbstractFullDataNetworkRequestQueue(
+			ClientNetworkState networkState, IDhClientLevel level, 
+			boolean changedOnly, ConfigEntry<Boolean> showDebugWireframeConfig)
+	{
+		this.networkState = networkState;
+		this.level = level;
+		this.changedOnly = changedOnly;
+		this.showDebugWireframeConfig = showDebugWireframeConfig;
+		DebugRenderer.register(this, this.showDebugWireframeConfig);
+	}
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	
+	protected abstract int getRequestRateLimit();
+	
+	protected abstract String getQueueName();
+	
+	
+	
+	//====================//
+	// request submitting //
+	//====================//
+	
+	public CompletableFuture<Boolean> submitRequest(long sectionPos, Consumer<FullDataSourceV2> dataSourceConsumer)
+	{ return this.submitRequest(sectionPos, null, dataSourceConsumer); }
+	public CompletableFuture<Boolean> submitRequest(long sectionPos, @Nullable Long clientTimestamp, Consumer<FullDataSourceV2> dataSourceConsumer)
+	{
+		LodUtil.assertTrue(DhSectionPos.getDetailLevel(sectionPos) == DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL, "Only highest-detail sections are allowed.");
+		
+		RequestQueueEntry entry = new RequestQueueEntry(dataSourceConsumer, clientTimestamp);
+		entry.future.whenComplete((success, throwable) ->
+		{
+			this.waitingTasksBySectionPos.remove(sectionPos);
+			
+			this.finishedRequests.incrementAndGet();
+			if (!success || throwable != null)
+			{
+				this.failedRequests.incrementAndGet();
+			}
+		});
+		
+		this.waitingTasksBySectionPos.put(sectionPos, entry);
+		return entry.future;
+	}
+	
+	public synchronized boolean tick(DhBlockPos2D targetPos)
+	{
+		if (this.closingFuture != null || !this.networkState.isReady())
+		{
+			return false;
+		}
+		
+		// queue requests until the queue is full
+		while (this.getInProgressTaskCount() < this.getWaitingTaskCount()
+				&& this.getInProgressTaskCount() < this.getRequestRateLimit()
+				&& this.pendingTasksSemaphore.tryAcquire())
+		{
+			if (!this.rateLimiter.tryAcquire())
+			{
+				this.pendingTasksSemaphore.release();
+				break;
+			}
+			
+			this.sendNextRequest(targetPos);
+		}
+		
+		return true;
+	}
+	private void sendNextRequest(DhBlockPos2D targetPos)
+	{
+		Map.Entry<Long, RequestQueueEntry> mapEntry = this.waitingTasksBySectionPos.entrySet().stream()
+				.filter(task -> task.getValue().networkDataSourceFuture == null)
+				.min((x, y) -> posDistanceSquared(targetPos, x.getKey()) - posDistanceSquared(targetPos, y.getKey()))
+				.orElse(null);
+		
+		if (mapEntry == null)
+		{
+			this.pendingTasksSemaphore.release();
+			return;
+		}
+		
+		long sectionPos = mapEntry.getKey();
+		RequestQueueEntry entry = mapEntry.getValue();
+		
+		CompletableFuture<FullDataSourceResponseMessage> dataSourceFuture = this.networkState.getSession().sendRequest(
+				new FullDataSourceRequestMessage(this.level.getLevelWrapper(), sectionPos, entry.updateTimestamp),
+				FullDataSourceResponseMessage.class
+			);
+		entry.networkDataSourceFuture = dataSourceFuture;
+		dataSourceFuture.handle((response, throwable) ->
+		{
+			this.pendingTasksSemaphore.release();
+			
+			try
+			{
+				if (throwable != null)
+				{
+					throw throwable;
+				}
+				
+				if (response.payload != null)
+				{
+					FullDataSourceV2DTO dataSourceDto = this.networkState.decodeDataSourceAndReleaseBuffer(response.payload);
+					
+					ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+					if (executor == null)
+					{
+						LOGGER.warn("Unable to handle FullDataPayload - getNetworkCompressionExecutor() is null");
+						return null;
+					}
+					CompletableFuture.runAsync(() ->
+					{
+						try
+						{
+							FullDataSourceV2 fullDataSource = dataSourceDto.createPooledDataSource(this.level.getLevelWrapper());
+							entry.dataSourceConsumer.accept(fullDataSource);
+							FullDataSourceV2.DATA_SOURCE_POOL.returnPooledDataSource(fullDataSource);
+						}
+						catch (IOException | DataCorruptedException | InterruptedException e)
+						{
+							throw new RuntimeException(e);
+						}
+					}, executor);
+				}
+				else
+				{
+					LodUtil.assertTrue(this.changedOnly, "Received empty data source response for not changes-only request");
+				}
+			}
+			catch (InvalidLevelException | RequestRejectedException ignored)
+			{
+				// We're too late / some cases might trigger a bunch of expected rejections
+				return entry.future.complete(false);
+			}
+			catch (SessionClosedException | CancellationException ignored)
+			{
+				// Triggered when level is unloaded
+				return entry.future.cancel(false);
+			}
+			catch (RateLimitedException e)
+			{
+				LOGGER.warn("Rate limited by server, re-queueing task [" + DhSectionPos.toString(sectionPos) + "]: " + e.getMessage());
+				
+				// Skip all requests for 1 second
+				this.rateLimiter.acquireAll();
+				
+				entry.networkDataSourceFuture = null;
+				return null;
+			}
+			catch (Throwable e)
+			{
+				entry.retryAttempts--;
+				LOGGER.error("Error while fetching full data source, attempts left: {} / {}", entry.retryAttempts, MAX_RETRY_ATTEMPTS, e);
+				
+				// Retry logic
+				if (entry.retryAttempts > 0)
+				{
+					entry.networkDataSourceFuture = null;
+					return null;
+				}
+				else
+				{
+					return entry.future.complete(false);
+				}
+			}
+			
+			// Hack to work around a race condition
+			// If you finish the request too quickly, the section will never render
+			TASK_FINISH_TIMER.schedule(new TimerTask()
+			{
+				@Override
+				public void run()
+				{
+					entry.future.complete(true);
+				}
+			}, 10000);
+			return null;
+		});
+	}
+	
+	
+	
+	
+	//=========================================//
+	// IFullDataSourceRetrievalQueue overrides //
+	//=========================================//
+	
+	public void removeRetrievalRequestIf(DhSectionPos.ICancelablePrimitiveLongConsumer removeIf)
+	{
+		for (Map.Entry<Long, RequestQueueEntry> mapEntry : this.waitingTasksBySectionPos.entrySet())
+		{
+			long pos = mapEntry.getKey();
+			RequestQueueEntry entry = mapEntry.getValue();
+			
+			if (removeIf.accept(pos))
+			{
+				LOGGER.debug("Removing request  " + mapEntry.getKey() + "...");
+				
+				entry.future.cancel(false);
+				if (entry.networkDataSourceFuture != null)
+				{
+					entry.networkDataSourceFuture.cancel(false);
+				}
+			}
+		}
+	}
+	
+	public void addDebugMenuStringsToList(List<String> messageList)
+	{
+		messageList.add(this.getQueueName() + " [" + this.level.getClientLevelWrapper().getDimensionName() + "]");
+		messageList.add("Requests: " + this.finishedRequests + " / " + (this.getWaitingTaskCount() + this.finishedRequests.get()) + " (failed: " + this.failedRequests + ", rate limit: " + this.getRequestRateLimit() + ")");
+	}
+	
+	public int getWaitingTaskCount() { return this.waitingTasksBySectionPos.size(); }
+	public int getInProgressTaskCount() { return Short.MAX_VALUE - this.pendingTasksSemaphore.availablePermits(); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	
+	public CompletableFuture<Void> startClosingAsync(boolean alsoInterruptRunning)
+	{
+		return this.closingFuture = CompletableFuture.runAsync(() -> {
+			Stopwatch stopwatch = Stopwatch.createStarted();
+			
+			do
+			{
+				for (RequestQueueEntry entry : this.waitingTasksBySectionPos.values())
+				{
+					entry.future.cancel(alsoInterruptRunning);
+					if (entry.networkDataSourceFuture != null && entry.networkDataSourceFuture.cancel(alsoInterruptRunning))
+					{
+						this.pendingTasksSemaphore.release();
+					}
+				}
+			}
+			while (!this.pendingTasksSemaphore.tryAcquire(Short.MAX_VALUE) && stopwatch.elapsed(TimeUnit.SECONDS) < SHUTDOWN_TIMEOUT_SECONDS);
+			
+			if (stopwatch.elapsed(TimeUnit.SECONDS) >= SHUTDOWN_TIMEOUT_SECONDS)
+			{
+				LOGGER.warn("The request queue [" + this.getQueueName() + "] for level [" + this.level.getLevelWrapper() + "] did not shutdown in [" + SHUTDOWN_TIMEOUT_SECONDS + "] seconds. Some unfinished tasks might be left hanging.");
+			}
+		});
+	}
+	
+	@Override
+	public void close()
+	{
+		DebugRenderer.unregister(this, this.showDebugWireframeConfig);
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
+	@Override
+	public void debugRender(DebugRenderer renderer)
+	{
+		if (MC_CLIENT.getWrappedClientLevel() != this.level.getClientLevelWrapper())
+		{
+			return;
+		}
+		
+		for (Map.Entry<Long, RequestQueueEntry> mapEntry : this.waitingTasksBySectionPos.entrySet())
+		{
+			renderer.renderBox(new DebugRenderer.Box(mapEntry.getKey(), -32f, 64f, 0.05f,
+					mapEntry.getValue().networkDataSourceFuture != null ? Color.red : Color.gray
+			));
+		}
+	}
+	
+	
+	
+	//================//
+	// helper methods //
+	//================//
+	
+	protected static int posDistanceSquared(DhBlockPos2D targetPos, long pos)
+	{ return (int) DhSectionPos.getCenterBlockPos(pos).distSquared(targetPos); }
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	protected static class RequestQueueEntry
+	{
+		/** encapsulates the entire request, including client side queuing and the actual server request */
+		public final CompletableFuture<Boolean> future = new CompletableFuture<>();
+		public final Consumer<FullDataSourceV2> dataSourceConsumer;
+		/** will be null if we want to retrieve the LOD regardless of when it was last updated */
+		@Nullable
+		public final Long updateTimestamp;
+		
+		
+		/** Will be null until the request has been sent to the server */
+		@CheckForNull
+		public CompletableFuture<FullDataSourceResponseMessage> networkDataSourceFuture;
+		
+		/** when this reaches zero then the request will be canceled. */
+		public int retryAttempts = MAX_RETRY_ATTEMPTS;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		public RequestQueueEntry(
+				Consumer<FullDataSourceV2> dataSourceConsumer,
+				@Nullable Long updateTimestamp)
+		{
+			this.dataSourceConsumer = dataSourceConsumer;
+			this.updateTimestamp = updateTimestamp;
+		}
+		
+	}
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/client/ClientNetworkState.java

@@ -0,0 +1,210 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.google.common.cache.CacheBuilder;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.event.ScopedNetworkEventSource;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.event.internal.IncompatibleMessageInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPayload;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.coreapi.ModInfo;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.buffer.CompositeByteBuf;
+import org.apache.logging.log4j.LogManager;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.Closeable;
+import java.util.List;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
+
+public class ClientNetworkState implements Closeable
+{
+	protected static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	
+	private final ConcurrentMap<Integer, CompositeByteBuf> fullDataBufferById = CacheBuilder.newBuilder()
+			.expireAfterAccess(10, TimeUnit.SECONDS)
+			.<Integer, CompositeByteBuf>build()
+			.asMap();
+	
+	private final SessionConfig.AnyChangeListener configAnyChangeListener = new SessionConfig.AnyChangeListener(this::sendConfigMessage);
+	
+	
+	private final NetworkSession networkSession = new NetworkSession(null);
+	/**
+	 * Returns the client used by this instance. <p>
+	 * If you need to subscribe to any packet events, create an instance of {@link ScopedNetworkEventSource} using the returned instance.
+	 */
+	public NetworkSession getSession() { return this.networkSession; }
+	
+	public SessionConfig sessionConfig = new SessionConfig();
+	
+	private volatile boolean configReceived = false;
+	public boolean isReady() { return this.configReceived; }
+	
+	private EServerSupportStatus serverSupportStatus = EServerSupportStatus.NONE;
+	
+	/** Protocol version closest to supported by this mod version */
+	@Nullable
+	private Integer closestProtocolVersion;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ClientNetworkState()
+	{
+		this.networkSession.registerHandler(IncompatibleMessageInternalEvent.class, event ->
+		{
+			if (this.closestProtocolVersion == null 
+				|| Math.abs(event.protocolVersion - ModInfo.PROTOCOL_VERSION) < this.closestProtocolVersion)
+			{
+				this.closestProtocolVersion = event.protocolVersion;
+			}
+		});
+		
+		this.networkSession.registerHandler(CurrentLevelKeyMessage.class, message ->
+		{
+			// we will also receive this message when we have full support
+			if (this.serverSupportStatus == EServerSupportStatus.NONE)
+			{
+				this.serverSupportStatus = EServerSupportStatus.LEVELS_ONLY;
+			}
+		});
+		
+		this.networkSession.registerHandler(SessionConfigMessage.class, message ->
+		{
+			this.serverSupportStatus = EServerSupportStatus.FULL;
+			
+			LOGGER.info("Connection config has been changed: ["+message.config+"].");
+			this.sessionConfig = message.config;
+			this.configReceived = true;
+		});
+		
+		this.networkSession.registerHandler(CloseInternalEvent.class, message ->
+		{
+			this.configReceived = false;
+		});
+		
+		this.networkSession.registerHandler(FullDataSplitMessage.class, message ->
+		{
+			if (message.isFirst)
+			{
+				CompositeByteBuf composite = this.fullDataBufferById.remove(message.bufferId);
+				if (composite != null)
+				{
+					composite.release();
+					LOGGER.debug("Released full data buffer ["+message.bufferId+"]: ["+composite+"]");
+				}
+			}
+			
+			CompositeByteBuf byteBuffer = this.fullDataBufferById.computeIfAbsent(message.bufferId, bufferId -> ByteBufAllocator.DEFAULT.compositeBuffer());
+			byteBuffer.addComponent(true, message.buffer);
+			LOGGER.debug("Full data buffer ["+message.bufferId+"]: ["+byteBuffer+"].");
+		});
+
+		this.networkSession.registerHandler(FullDataPartialUpdateMessage.class, msg ->
+		{
+			// Dummy handler to prevent unhandled message warnings
+		});
+	}
+	
+	
+	
+	//==============//
+	// send message //
+	//==============//
+	
+	public FullDataSourceV2DTO decodeDataSourceAndReleaseBuffer(FullDataPayload msg)
+	{
+		CompositeByteBuf compositeByteBuffer = this.fullDataBufferById.remove(msg.dtoBufferId);
+		LodUtil.assertTrue(compositeByteBuffer != null);
+		
+		try
+		{
+			return INetworkObject.decodeToInstance(FullDataSourceV2DTO.CreateEmptyDataSource(), compositeByteBuffer);
+		}
+		finally
+		{
+			compositeByteBuffer.release();
+		}
+	}
+	
+	public void sendConfigMessage()
+	{
+		this.configReceived = false;
+		this.getSession().sendMessage(new SessionConfigMessage(new SessionConfig()));
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
+	public void addDebugMenuStringsToList(List<String> messageList)
+	{
+		if (this.networkSession.isClosed())
+		{
+			messageList.add("NetworkSession closed: " + this.networkSession.getCloseReason().getMessage());
+			return;
+		}
+		
+		if (this.serverSupportStatus == EServerSupportStatus.NONE && this.closestProtocolVersion != null)
+		{
+			messageList.add("Incompatible protocol version: [" + this.closestProtocolVersion + "], required: [" + ModInfo.PROTOCOL_VERSION+ "]");
+			return;
+		}
+		
+		messageList.add(this.serverSupportStatus.message);
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.configAnyChangeListener.close();
+		this.networkSession.close();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/**
+	 * NONE,        <br>
+	 * LEVELS_ONLY, <br>
+	 * FULL,        <br>
+	 */
+	private enum EServerSupportStatus
+	{
+		NONE("Server does not support DH"),
+		LEVELS_ONLY("Server supports shared level keys"),
+		FULL("Server has full DH support");
+		
+		public final String message;
+		
+		EServerSupportStatus(String message) { this.message = message; }
+		
+	}
+}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/client/SyncOnLoginRequestQueue.java

@@ -0,0 +1,57 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+
+/** 
+ * This queue only handles LOD updates for
+ * LODs that were changed when the player wasn't online
+ * and the player already loaded the LODs once.
+ * {@link RemoteWorldRetrievalQueue} is used for all other requests.
+ * 
+ * @see Config.Client.Advanced.Multiplayer.ServerNetworking#synchronizeOnLogin
+ * @see RemoteWorldRetrievalQueue
+ */
+public class SyncOnLoginRequestQueue extends AbstractFullDataNetworkRequestQueue
+{
+	//=============//
+	// constructor //
+	//=============//
+	
+	public SyncOnLoginRequestQueue(IDhClientLevel level, ClientNetworkState networkState)
+	{ super(networkState, level, true, Config.Client.Advanced.Debugging.DebugWireframe.showWorldGenQueue); }
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Override
+	protected int getRequestRateLimit() { return this.networkState.sessionConfig.getSyncOnLoginRateLimit(); }
+	
+	@Override
+	protected String getQueueName() { return "Sync On Login Queue"; }
+	
+	
+	
+	//==================//
+	// request handling //
+	//==================//
+	
+	@Override
+	public boolean tick(DhBlockPos2D targetPos)
+	{
+		if (!this.networkState.sessionConfig.getSynchronizeOnLogin())
+		{
+			return false;
+		}
+		
+		return super.tick(targetPos);
+	}
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/config/SessionConfig.java

@@ -0,0 +1,184 @@
+package com.seibel.distanthorizons.core.multiplayer.config;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
+import com.seibel.distanthorizons.core.config.types.ConfigEntry;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import io.netty.buffer.ByteBuf;
+
+import java.io.Closeable;
+import java.util.*;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class SessionConfig implements INetworkObject
+{
+	private static final LinkedHashMap<String, Entry> CONFIG_ENTRIES = new LinkedHashMap<>();
+	
+	
+	private final LinkedHashMap<String, Object> values = new LinkedHashMap<>();
+	public SessionConfig constrainingConfig;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	static
+	{
+		// Note: config values are ordered by serversideShortName when transmitted
+		
+		registerConfigEntry(Config.Client.Advanced.Graphics.Quality.lodChunkRenderDistanceRadius, Math::min);
+		
+		registerConfigEntry(Config.Client.Advanced.WorldGenerator.enableDistantGeneration, (x, y) -> x && y);
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit, Math::min);
+		
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates, (x, y) -> x && y);
+		
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.synchronizeOnLogin, (x, y) -> x && y);
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit, Math::min);
+	}
+	
+	public SessionConfig() {}
+	
+	
+	
+	//===============//
+	// public values //
+	//===============//
+	
+	public int getRenderDistanceRadius() { return this.getValue(Config.Client.Advanced.Graphics.Quality.lodChunkRenderDistanceRadius); }
+	public boolean isDistantGenerationEnabled() { return this.getValue(Config.Client.Advanced.WorldGenerator.enableDistantGeneration); }
+	public int getGenerationRequestRateLimit() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit); }
+	public boolean isRealTimeUpdatesEnabled() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates); }
+	public boolean getSynchronizeOnLogin() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.synchronizeOnLogin); }
+	public int getSyncOnLoginRateLimit() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit); }
+	
+	
+	
+	//====================//
+	// entry registration //
+	//====================//
+	
+	private static <T> void registerConfigEntry(ConfigEntry<T> configEntry, BiFunction<T, T, T> valueConstrainer)
+	{
+		CONFIG_ENTRIES.put(Objects.requireNonNull(configEntry.getServersideShortName()), new Entry(configEntry, valueConstrainer));
+	}
+	
+	
+	
+	//==================//
+	// internal getters //
+	//==================//
+	
+	private <T> T getValue(ConfigEntry<T> configEntry) { return this.getValue(configEntry.getServersideShortName()); }
+	@SuppressWarnings("unchecked")
+	private <T> T getValue(String name)
+	{
+		Entry entry = CONFIG_ENTRIES.get(name);
+		
+		T value = (T) this.values.get(name);
+		if (value == null)
+		{
+			value = (T) entry.supplier.get();
+		}
+		
+		return (this.constrainingConfig != null
+				? (T) entry.valueConstrainer.apply(value, this.constrainingConfig.getValue(name))
+				: value);
+	}
+	
+	private Map<String, ?> getValues()
+	{
+		return CONFIG_ENTRIES.keySet().stream().collect(Collectors.toMap(
+				Function.identity(),
+				this::getValue,
+				(x, y) -> x,
+				LinkedHashMap::new
+		));
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf outBuffer) { this.writeFixedLengthCollection(outBuffer, this.getValues().values()); }
+	
+	@Override
+	public void decode(ByteBuf inBuffer)
+	{
+		for (String key : CONFIG_ENTRIES.keySet())
+		{
+			Object currentValue = this.getValue(key);
+			Object newValue = Codec.getCodec(currentValue.getClass()).decode.apply(currentValue, inBuffer);
+			this.values.put(key, newValue);
+		}
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public String toString()
+	{
+		return MoreObjects.toStringHelper(this)
+				.add("values", this.getValues())
+				.toString();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class Entry
+	{
+		public final ConfigEntry<Object> supplier;
+		public final BiFunction<Object, Object, Object> valueConstrainer;
+		
+		@SuppressWarnings("unchecked")
+		private <T> Entry(ConfigEntry<T> supplier, BiFunction<T, T, T> valueConstrainer)
+		{
+			this.supplier = (ConfigEntry<Object>) supplier;
+			this.valueConstrainer = (BiFunction<Object, Object, Object>) valueConstrainer;
+		}
+		
+	}
+	
+	/** fires if any config value was changed */
+	public static class AnyChangeListener implements Closeable
+	{
+		private final ArrayList<ConfigChangeListener<?>> changeListeners;
+		
+		public AnyChangeListener(Runnable runnable)
+		{
+			this.changeListeners = new ArrayList<>(CONFIG_ENTRIES.size());
+			for (Entry entry : CONFIG_ENTRIES.values())
+			{
+				this.changeListeners.add(new ConfigChangeListener<>(entry.supplier, ignored -> runnable.run()));
+			}
+		}
+		
+		@Override
+		public void close()
+		{
+			for (ConfigChangeListener<?> changeListener : this.changeListeners)
+			{
+				changeListener.close();
+			}
+			this.changeListeners.clear();
+		}
+		
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/server/RemotePlayerConnectionHandler.java

@@ -0,0 +1,85 @@
+package com.seibel.distanthorizons.core.multiplayer.server;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Queue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ConcurrentMap;
+
+public class RemotePlayerConnectionHandler
+{
+	private final ConcurrentMap<IServerPlayerWrapper, ServerPlayerState> connectedPlayerStateByPlayerWrapper = new ConcurrentHashMap<>();
+	private final ConcurrentMap<IServerPlayerWrapper, Queue<AbstractNetworkMessage>> messageQueueByPlayerWrapper = new ConcurrentHashMap<>();
+	
+	
+	
+	//========================//
+	// player joining/leaving //
+	//========================//
+	
+	public ServerPlayerState registerJoinedPlayer(IServerPlayerWrapper serverPlayer)
+	{
+		ServerPlayerState playerState = new ServerPlayerState(serverPlayer);
+		this.connectedPlayerStateByPlayerWrapper.put(serverPlayer, playerState);
+		
+		Queue<AbstractNetworkMessage> queuedMessages = this.messageQueueByPlayerWrapper.get(serverPlayer);
+		if (queuedMessages != null)
+		{
+			NetworkSession networkSession = playerState.networkSession;
+			for (AbstractNetworkMessage message : queuedMessages)
+			{
+				networkSession.tryHandleMessage(message);
+			}
+			
+			this.messageQueueByPlayerWrapper.remove(serverPlayer);
+		}
+		
+		return playerState;
+	}
+	
+	public void unregisterLeftPlayer(IServerPlayerWrapper serverPlayer)
+	{
+		ServerPlayerState playerState = this.connectedPlayerStateByPlayerWrapper.remove(serverPlayer);
+		if (playerState != null)
+		{
+			playerState.close();
+		}
+	}
+	
+	
+	
+	//==========//
+	// messages //
+	//==========//
+	
+	public void handlePluginMessage(IServerPlayerWrapper player, AbstractNetworkMessage message)
+	{
+		ServerPlayerState playerState = this.connectedPlayerStateByPlayerWrapper.get(player);
+		if (playerState != null)
+		{
+			playerState.networkSession.tryHandleMessage(message);
+		}
+		else
+		{
+			this.messageQueueByPlayerWrapper.computeIfAbsent(player, k -> new ConcurrentLinkedQueue<>()).add(message);
+		}
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Nullable
+	public ServerPlayerState getConnectedPlayer(IServerPlayerWrapper player) { return this.connectedPlayerStateByPlayerWrapper.get(player); }
+	public Iterable<ServerPlayerState> getConnectedPlayers() { return this.connectedPlayerStateByPlayerWrapper.values(); }
+	
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/server/ServerPlayerState.java

@@ -0,0 +1,123 @@
+package com.seibel.distanthorizons.core.multiplayer.server;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
+import com.seibel.distanthorizons.core.level.DhServerLevel;
+import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.util.ratelimiting.SupplierBasedRateAndConcurrencyLimiter;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.Closeable;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ServerPlayerState implements Closeable
+{
+	private final ConfigChangeListener<String> levelKeyPrefixChangeListener
+			= new ConfigChangeListener<>(Config.Client.Advanced.Multiplayer.ServerNetworking.levelKeyPrefix, this::onLevelKeyPrefixConfigChanged);
+	private final SessionConfig.AnyChangeListener configAnyChangeListener = new SessionConfig.AnyChangeListener(this::onSessionConfigChanged);
+	
+	
+	private String lastLevelKey = "";
+	
+	
+	public final NetworkSession networkSession;
+	public IServerPlayerWrapper getServerPlayer() { return this.networkSession.serverPlayer; }
+	
+	@NotNull
+	public final SessionConfig sessionConfig = new SessionConfig();
+	
+	private final ConcurrentHashMap<DhServerLevel, RateLimiterSet> rateLimiterSets = new ConcurrentHashMap<>();
+	public RateLimiterSet getRateLimiterSet(DhServerLevel level) { return this.rateLimiterSets.computeIfAbsent(level, ignored -> new RateLimiterSet()); }
+	public void clearRateLimiterSets() { this.rateLimiterSets.clear(); }
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public ServerPlayerState(IServerPlayerWrapper serverPlayer)
+	{
+		this.networkSession = new NetworkSession(serverPlayer);
+		
+		this.networkSession.registerHandler(SessionConfigMessage.class, (sessionConfigMessage) ->
+		{
+			this.sessionConfig.constrainingConfig = sessionConfigMessage.config;
+			this.sendLevelKey();
+			this.networkSession.sendMessage(new SessionConfigMessage(this.sessionConfig));
+		});
+		
+		this.networkSession.registerHandler(CloseInternalEvent.class, event -> {
+			// No-op. prevents "Unhandled message" log entries
+		});
+	}
+	
+	
+	
+	//=================//
+	// client updating //
+	//=================//
+	
+	private void onLevelKeyPrefixConfigChanged(String newLevelKey) { this.sendLevelKey(); }
+	private void sendLevelKey()
+	{
+		if (Config.Client.Advanced.Multiplayer.ServerNetworking.sendLevelKeys.get())
+		{
+			// let the client's know about the change
+			String levelKey = this.getServerPlayer().getLevel().getKeyedLevelDimensionName();
+			if (!levelKey.equals(this.lastLevelKey))
+			{
+				this.lastLevelKey = levelKey;
+				this.networkSession.sendMessage(new CurrentLevelKeyMessage(levelKey));
+			}
+		}
+	}
+	
+	private void onSessionConfigChanged() { this.networkSession.sendMessage(new SessionConfigMessage(this.sessionConfig)); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.levelKeyPrefixChangeListener.close();
+		this.configAnyChangeListener.close();
+		this.networkSession.close();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	public class RateLimiterSet
+	{
+		public final SupplierBasedRateAndConcurrencyLimiter<FullDataSourceRequestMessage> generationRequestRateLimiter = new SupplierBasedRateAndConcurrencyLimiter<>(
+				() -> Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit.get(),
+				msg -> {
+					msg.sendResponse(new RateLimitedException("Full data request rate limit: " + ServerPlayerState.this.sessionConfig.getGenerationRequestRateLimit()));
+				}
+		);
+		
+		public final SupplierBasedRateAndConcurrencyLimiter<FullDataSourceRequestMessage> syncOnLoginRateLimiter = new SupplierBasedRateAndConcurrencyLimiter<>(
+				() -> Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit.get(),
+				msg -> {
+					msg.sendResponse(new RateLimitedException("Sync on login rate limit: " + ServerPlayerState.this.sessionConfig.getSyncOnLoginRateLimit()));
+				}
+		);
+		
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/INetworkObject.java

@@ -0,0 +1,228 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network;
+
+import io.netty.buffer.ByteBuf;
+import org.jetbrains.annotations.Contract;
+
+import javax.annotation.Nullable;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.*;
+
+/** The base for any object that can be sent over the network. */
+public interface INetworkObject
+{
+	/** Serializes this object into the given {@link ByteBuf} */
+	void encode(ByteBuf out);
+	/** Populates this object's from the given {@link ByteBuf} */
+	void decode(ByteBuf in);
+	
+	
+	
+	//========================//
+	// default/static methods //
+	//========================//
+	
+	/** 
+	 * @param obj the empty object that will be populated by the incoming {@link ByteBuf}
+	 */
+	static <T extends INetworkObject> T decodeToInstance(T obj, ByteBuf inputByteBuf)
+	{
+		obj.decode(inputByteBuf);
+		return obj;
+	}
+	
+	
+	
+	@Contract("_, null -> false; _, !null -> true")
+	default boolean writeOptional(ByteBuf outputByteBuf, Object value)
+	{
+		boolean isNull = value != null;
+		outputByteBuf.writeBoolean(isNull);
+		return isNull;
+	}
+	
+	@Nullable
+	default <T> T readOptional(ByteBuf inputByteBuf, Supplier<T> decoder)
+	{
+		return inputByteBuf.readBoolean()
+				? decoder.get() 
+				: null;
+	}
+	default void readOptional(ByteBuf inputByteBuf, Runnable decoder)
+	{
+		if (inputByteBuf.readBoolean())
+		{
+			decoder.run();
+		}
+	}
+	
+	
+	// strings //
+	
+	default void writeString(String inputString, ByteBuf outputByteBuf) { INetworkObject.writeStringStatic(inputString, outputByteBuf); }
+	static void writeStringStatic(String inputString, ByteBuf outputByteBuf)
+	{
+		byte[] bytes = inputString.getBytes(StandardCharsets.UTF_8);
+		outputByteBuf.writeShort(bytes.length);
+		outputByteBuf.writeBytes(bytes);
+	}
+	
+	default String readString(ByteBuf inputByteBuf) { return INetworkObject.readStringStatic(inputByteBuf); }
+	static String readStringStatic(ByteBuf inputByteBuf)
+	{
+		int length = inputByteBuf.readUnsignedShort();
+		return inputByteBuf.readSlice(length).toString(StandardCharsets.UTF_8);
+	}
+	
+	
+	// collections //
+	
+	default <T> void writeCollection(ByteBuf outputByteBuf, Collection<T> collection)
+	{
+		outputByteBuf.writeInt(collection.size());
+		this.writeFixedLengthCollection(outputByteBuf, collection);
+	}
+	default <T> void writeFixedLengthCollection(ByteBuf outputByteBuf, Collection<T> collection)
+	{
+		for (T item : collection)
+		{
+			Codec codec = Codec.getCodec(item.getClass());
+			codec.encode.accept(item, outputByteBuf);
+		}
+	}
+	
+	default <T> void readCollection(ByteBuf inputByteBuf, Collection<T> collection, Supplier<T> innerValueConstructor)
+	{
+		int size = inputByteBuf.readInt();
+		
+		Codec codec = null;
+		for (int i = 0; i < size; i++)
+		{
+			T item = innerValueConstructor.get();
+			
+			if (codec == null)
+			{
+				codec = Codec.getCodec(item.getClass());
+			}
+			//noinspection unchecked
+			item = (T) codec.decode.apply(item, inputByteBuf);
+			
+			collection.add(item);
+		}
+	}
+	
+	default <K, V> void readMap(ByteBuf inputByteBuf, Map<K, V> map, Supplier<K> keySupplier, Supplier<V> valueSupplier)
+	{
+		ArrayList<Map.Entry<K, V>> entryList = new ArrayList<>();
+		
+		this.readCollection(inputByteBuf, entryList, () -> new AbstractMap.SimpleEntry<>(keySupplier.get(), valueSupplier.get()));
+		for (Map.Entry<K, V> entry : entryList)
+		{
+			map.put(entry.getKey(), entry.getValue());
+		}
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/**
+	 * Defines (de)serialization for different classes,
+	 * specifically for base classes like {@link Integer}, {@link Boolean}, and {@link String}. <br><br>
+	 * 
+	 * Should only be used for non-editable classes;
+	 * otherwise, you may want to implement {@link INetworkObject} and use its methods where applicable.
+	 */
+	class Codec
+	{
+		private static final ConcurrentMap<Class<?>, Codec> CODEC_MAP = new ConcurrentHashMap<Class<?>, Codec>()
+		{{
+			// Primitives must be added manually here
+			this.put(Integer.class, new Codec((obj, outByteBuff) -> outByteBuff.writeInt((int)obj), (obj, inByteBuff) -> inByteBuff.readInt()));
+			this.put(Boolean.class, new Codec((obj, outByteBuff) -> outByteBuff.writeBoolean((boolean) obj), (obj, inByteBuff) -> inByteBuff.readBoolean()));
+			this.put(String.class, new Codec((obj, outByteBuff) -> INetworkObject.writeStringStatic((String) obj, outByteBuff), (obj, inByteBuff) -> INetworkObject.readStringStatic(inByteBuff)));
+			
+			this.put(INetworkObject.class, new Codec(INetworkObject::encode, INetworkObject::decodeToInstance));
+			this.put(Map.Entry.class, new Codec(
+					(obj, outByteBuff) -> 
+					{
+						Map.Entry<?, ?> entry = (Entry<?, ?>) obj;
+						getCodec(entry.getKey().getClass()).encode.accept(entry.getKey(), outByteBuff);
+						getCodec(entry.getValue().getClass()).encode.accept(entry.getValue(), outByteBuff);
+					},
+					(obj, inByteBuff) -> 
+					{
+						Map.Entry<?, ?> entry = (Entry<?, ?>) obj;
+						return new SimpleEntry<>(
+							getCodec(entry.getKey().getClass()).decode.apply(entry.getKey(), inByteBuff),
+							getCodec(entry.getValue().getClass()).decode.apply(entry.getValue(), inByteBuff)
+						);
+					}
+			));
+		}};
+		
+		
+		public final BiConsumer<Object, ByteBuf> encode;
+		public final BiFunction<Object, ByteBuf, Object> decode;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		@SuppressWarnings("unchecked")
+		public <T> Codec(BiConsumer<T, ByteBuf> encode, BiFunction<T, ByteBuf, T> decode)
+		{
+			this.encode = (BiConsumer<Object, ByteBuf>) encode;
+			this.decode = (BiFunction<Object, ByteBuf, Object>) decode;
+		}
+		
+		
+		
+		//================//
+		// static methods //
+		//================//
+		
+		public static <T> Codec getCodec(Class<T> clazz)
+		{
+			return CODEC_MAP.computeIfAbsent(clazz, ignored -> 
+			{
+				// TODO when would this ever return true?
+				for (Map.Entry<Class<?>, Codec> entry : CODEC_MAP.entrySet())
+				{
+					if (entry.getKey().isAssignableFrom(clazz))
+					{
+						return entry.getValue();
+					}
+				}
+				
+				throw new AssertionError("Class has no compatible codec: " + clazz.getSimpleName());
+			});
+		}
+		
+	}
+}

core/src/main/java/com/seibel/distanthorizons/core/network/NetworkClient.java

@@ -1,175 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.CloseMessage;
-import com.seibel.distanthorizons.core.network.messages.CloseReasonMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.NetworkChannelInitializer;
-//import io.netty.bootstrap.Bootstrap;
-//import io.netty.channel.Channel;
-//import io.netty.channel.ChannelFuture;
-//import io.netty.channel.ChannelOption;
-//import io.netty.channel.EventLoopGroup;
-//import io.netty.channel.nio.NioEventLoopGroup;
-//import io.netty.channel.socket.nio.NioSocketChannel;
-import org.apache.logging.log4j.Logger;
-
-import java.net.InetSocketAddress;
-import java.util.concurrent.TimeUnit;
-
-public class NetworkClient //extends NetworkEventSource implements AutoCloseable 
-{
-//    private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-//	
-//    private enum EConnectionState
-//	{
-//        OPEN,
-//        RECONNECT,
-//        RECONNECT_FORCE,
-//        CLOSE_WAIT,
-//        CLOSED
-//    }
-//	
-//    private static final int FAILURE_RECONNECT_DELAY_SEC = 5;
-//    private static final int FAILURE_RECONNECT_ATTEMPTS = 3;
-//	
-//    // TODO move to payload of some sort
-//    private final InetSocketAddress address;
-//	
-//    private final EventLoopGroup workerGroup = new NioEventLoopGroup();
-//    private final Bootstrap clientBootstrap = new Bootstrap()
-//            .group(this.workerGroup)
-//            .channel(NioSocketChannel.class)
-//            .option(ChannelOption.SO_KEEPALIVE, true)
-//            .handler(new NetworkChannelInitializer(this.messageHandler));
-//	
-//    private EConnectionState connectionState;
-//    private Channel channel;
-//    private int reconnectAttempts = FAILURE_RECONNECT_ATTEMPTS;
-//	
-//	
-//	
-//    public NetworkClient(String host, int port)
-//	{
-//        this.address = new InetSocketAddress(host, port);
-//		
-//		this.registerHandlers();
-//		this.connect();
-//    }
-//	
-//    private void registerHandlers() 
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//            LOGGER.info("Connected to server: "+channelContext.channel().remoteAddress());
-//        });
-//		
-//		this.registerHandler(CloseReasonMessage.class, (closeReasonMessage, channelContext) -> 
-//		{
-//            LOGGER.info(closeReasonMessage.reason);
-//			this.connectionState = EConnectionState.CLOSE_WAIT;
-//        });
-//		
-//		this.registerHandler(CloseMessage.class, (closeMessage, channelContext) ->
-//		{
-//            LOGGER.info("Disconnected from server: "+channelContext.channel().remoteAddress());
-//            if (this.connectionState == EConnectionState.CLOSE_WAIT)
-//			{
-//				this.close();
-//			}
-//        });
-//    }
-//
-//    private void connect() 
-//	{
-//        LOGGER.info("Connecting to server: "+this.address);
-//		this.connectionState = EConnectionState.OPEN;
-//
-//		// FIXME sometimes this causes the MC connection to crash 
-//		//  this might happen if the URL can't be converted to a IP (IE UnknownHostException)
-//        ChannelFuture connectFuture = this.clientBootstrap.connect(this.address);
-//        connectFuture.addListener((ChannelFuture channelFuture) -> 
-//		{
-//            if (!channelFuture.isSuccess()) 
-//			{
-//                LOGGER.warn("Connection failed: "+channelFuture.cause());
-//                return;
-//            }
-//			
-//			this.channel.writeAndFlush(new HelloMessage());
-//        });
-//		
-//		this.channel = connectFuture.channel();
-//		this. channel.closeFuture().addListener((ChannelFuture channelFuture) -> 
-//		{
-//			switch (this.connectionState)
-//			{
-//				case OPEN:
-//					this.reconnectAttempts--;
-//					LOGGER.info("Reconnection attempts left: ["+this.reconnectAttempts+"] of ["+FAILURE_RECONNECT_ATTEMPTS+"].");
-//					if (this.reconnectAttempts == 0)
-//					{
-//						this.connectionState = EConnectionState.CLOSE_WAIT;
-//						return;
-//					}
-//					
-//					this.connectionState = EConnectionState.RECONNECT;
-//					this.workerGroup.schedule(this::connect, FAILURE_RECONNECT_DELAY_SEC, TimeUnit.SECONDS);
-//					break;
-//					
-//				case RECONNECT_FORCE:
-//					LOGGER.info("Reconnecting forcefully.");
-//					this.reconnectAttempts = FAILURE_RECONNECT_ATTEMPTS;
-//					
-//					this.connectionState = EConnectionState.RECONNECT;
-//					this.workerGroup.schedule(this::connect, 0, TimeUnit.SECONDS);
-//					break;
-//			}
-//        });
-//    }
-//
-//    /** Kills the current connection, triggering auto-reconnection immediately. */
-//    public void reconnect() 
-//	{
-//		this.connectionState = EConnectionState.RECONNECT_FORCE;
-//		this.channel.disconnect();
-//    }
-//
-//    @Override
-//    public void close() 
-//	{
-//        if (this.closeReason != null)
-//		{
-//			LOGGER.error(this.closeReason);
-//		}
-//
-//        if (this.connectionState == EConnectionState.CLOSED)
-//		{
-//			return;
-//		}
-//		
-//		this.connectionState = EConnectionState.CLOSED;
-//		this.workerGroup.shutdownGracefully().syncUninterruptibly();
-//		this.channel.close().syncUninterruptibly();
-//    }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/NetworkEventSource.java

@@ -1,82 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.AckMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.core.network.protocol.MessageHandler;
-import com.seibel.distanthorizons.coreapi.ModInfo;
-//import io.netty.channel.ChannelHandlerContext;
-import org.apache.logging.log4j.Logger;
-
-import java.util.function.BiConsumer;
-import java.util.function.Consumer;
-
-public abstract class NetworkEventSource implements AutoCloseable
-{
-	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-	
-	protected final MessageHandler messageHandler = new MessageHandler();
-	protected String closeReason = null;
-
-
-
-//	public NetworkEventSource()
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//			if (helloMessage.version != ModInfo.PROTOCOL_VERSION)
-//			{
-//				try
-//				{
-//					String closeReason = "Ignoring message from channel ["+channelContext.name()+"], due to version mismatch. Expected version: ["+ModInfo.PROTOCOL_VERSION+"], received version: ["+helloMessage.version+"].";
-//					LOGGER.info(closeReason);
-//					this.close(closeReason);
-//				}
-//				catch (Exception e)
-//				{
-//					throw new RuntimeException(e);
-//				}
-//			}
-//		});
-//	}
-//	
-//	public <T extends INetworkMessage> void registerHandler(Class<T> clazz, BiConsumer<T, ChannelHandlerContext> handler) { this.messageHandler.registerHandler(clazz, handler); }
-//	
-//	public <T extends INetworkMessage> void registerAckHandler(Class<T> clazz, Consumer<ChannelHandlerContext> handler)
-//	{
-//		this.messageHandler.registerHandler(AckMessage.class, (ackMessage, channelContext) -> 
-//		{
-//			if (ackMessage.messageType == clazz)
-//			{
-//				handler.accept(channelContext);
-//			}
-//		});
-//	}
-//	
-//	public void close(String reason) throws Exception
-//	{
-//		this.closeReason = reason;
-//		this.close();
-//	}
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/NetworkServer.java

@@ -1,122 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.CloseReasonMessage;
-import com.seibel.distanthorizons.core.network.messages.CloseMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.NetworkChannelInitializer;
-//import io.netty.bootstrap.ServerBootstrap;
-//import io.netty.channel.*;
-//import io.netty.channel.nio.NioEventLoopGroup;
-//import io.netty.channel.socket.nio.NioServerSocketChannel;
-//import io.netty.handler.logging.LogLevel;
-//import io.netty.handler.logging.LoggingHandler;
-import org.apache.logging.log4j.Logger;
-
-public class NetworkServer //extends NetworkEventSource implements AutoCloseable
-{
-//	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-//	
-//	// TODO move to the config
-//	private final int port;
-//	
-//	private final EventLoopGroup bossGroup = new NioEventLoopGroup(1);
-//	private final EventLoopGroup workerGroup = new NioEventLoopGroup();
-//	private Channel channel;
-//	private boolean isClosed = false;
-//	
-//	
-//	
-//	public NetworkServer(int port)
-//	{
-//		this.port = port;
-//		
-//		LOGGER.info("Starting server on port "+port);
-//		this.registerHandlers();
-//		this.bind();
-//	}
-//	
-//	private void registerHandlers()
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//			LOGGER.info("Client connected: "+channelContext.channel().remoteAddress());
-//			channelContext.channel().writeAndFlush(new HelloMessage());
-//		});
-//		
-//		this.registerHandler(CloseMessage.class, (closeMessage, channelContext) -> 
-//		{
-//			LOGGER.info("Client disconnected: "+channelContext.channel().remoteAddress());
-//		});
-//	}
-//	
-//	private void bind()
-//	{
-//		ServerBootstrap bootstrap = new ServerBootstrap()
-//				.group(this.bossGroup, this.workerGroup)
-//				.channel(NioServerSocketChannel.class)
-//				.handler(new LoggingHandler(LogLevel.DEBUG))
-//				.childHandler(new NetworkChannelInitializer(this.messageHandler));
-//		
-//		ChannelFuture bindFuture = bootstrap.bind(this.port);
-//		bindFuture.addListener((ChannelFuture channelFuture) -> 
-//		{
-//			if (!channelFuture.isSuccess())
-//			{
-//				throw new RuntimeException("Failed to bind: " + channelFuture.cause());
-//			}
-//			
-//			LOGGER.info("Server is started on port "+this.port);
-//		});
-//		
-//		this.channel = bindFuture.channel();
-//		this.channel.closeFuture().addListener(future -> this.close());
-//	}
-//	
-//	public void disconnectClient(ChannelHandlerContext ctx, String reason)
-//	{
-//		ctx.channel().config().setAutoRead(false);
-//		ctx.writeAndFlush(new CloseReasonMessage(reason))
-//				.addListener(ChannelFutureListener.CLOSE);
-//	}
-//	
-//	@Override
-//	public void close()
-//	{
-//		if (this.closeReason != null)
-//		{
-//			LOGGER.error(this.closeReason);
-//		}
-//		
-//		if (this.isClosed)
-//		{
-//			return;
-//		}
-//		this.isClosed = true;
-//		
-//		LOGGER.info("Shutting down the network server.");
-//		this.workerGroup.shutdownGracefully().syncUninterruptibly();
-//		this.bossGroup.shutdownGracefully().syncUninterruptibly();
-//		LOGGER.info("Network server has been closed.");
-//	}
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/event/AbstractNetworkEventSource.java

@@ -0,0 +1,235 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.event;
+
+import com.google.common.cache.CacheBuilder;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.network.event.internal.AbstractInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import com.seibel.distanthorizons.core.network.messages.MessageRegistry;
+import com.seibel.distanthorizons.core.network.session.SessionClosedException;
+import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.ExceptionMessage;
+import com.seibel.distanthorizons.coreapi.ModInfo;
+import org.apache.logging.log4j.LogManager;
+
+import java.io.InvalidClassException;
+import java.util.Collections;
+import java.util.Set;
+import java.util.concurrent.*;
+import java.util.function.Consumer;
+
+public abstract class AbstractNetworkEventSource
+{
+	private static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	
+	/**
+	 * Contains all message handlers. <br>
+	 * Grouped by: <br>
+	 * - {@link AbstractNetworkMessage} type <br>
+	 * - {@link AbstractNetworkEventSource} <br>
+	 */
+	private final ConcurrentHashMap<
+			Class<? extends AbstractNetworkMessage>,
+			ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>>
+			> networkHandlerSetByMessageClass = new ConcurrentHashMap<>();
+	
+	
+	private final ConcurrentHashMap<Long, FutureResponseData> pendingFutureById = new ConcurrentHashMap<>();
+	/** automatically forgets about ID's after a set time span. */
+	private final Set<Long> cancelledFutureIdSet = Collections.newSetFromMap(
+			CacheBuilder.newBuilder()
+			.expireAfterWrite(10, TimeUnit.SECONDS)
+			.<Long, Boolean>build()
+			.asMap());
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	protected void handleMessage(AbstractNetworkMessage message)
+	{
+		boolean handled = false;
+		
+		ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>> handlersByEventSource = this.networkHandlerSetByMessageClass.get(message.getClass());
+		if (handlersByEventSource != null)
+		{
+			for (Set<INetworkMessageConsumer> handlerSet : handlersByEventSource.values())
+			{
+				for (INetworkMessageConsumer handler : handlerSet)
+				{
+					handled = true;
+					handler.accept(message);
+				}
+			}
+		}
+		
+		if (message instanceof AbstractTrackableMessage)
+		{
+			AbstractTrackableMessage trackableMessage = (AbstractTrackableMessage) message;
+			
+			FutureResponseData responseData = this.pendingFutureById.get(trackableMessage.futureId);
+			if (responseData != null)
+			{
+				handled = true;
+				
+				if (message instanceof ExceptionMessage)
+				{
+					responseData.future.completeExceptionally(((ExceptionMessage) message).exception);
+				}
+				else if (message.getClass() != responseData.responseClass)
+				{
+					responseData.future.completeExceptionally(new InvalidClassException("Response with invalid type: expected " + responseData.responseClass.getSimpleName() + ", got:" + message));
+				}
+				else
+				{
+					responseData.future.complete(trackableMessage);
+				}
+			}
+			else if (this.cancelledFutureIdSet.remove(trackableMessage.futureId))
+			{
+				handled = true;
+			}
+		}
+		
+		if (!handled && ModInfo.IS_DEV_BUILD)
+		{
+			LOGGER.warn("Unhandled message: [{}].", message);
+		}
+	}
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	
+	public abstract <T extends AbstractNetworkMessage> void registerHandler(Class<T> handlerClass, Consumer<T> handlerImplementation);
+	
+	
+	
+	//==================//
+	// message handlers //
+	//==================//
+	
+	protected final <T extends AbstractNetworkMessage> void registerHandler(AbstractNetworkEventSource eventSource, Class<T> handlerClass, Consumer<T> handlerImplementation)
+	{
+		if (!AbstractInternalEvent.class.isAssignableFrom(handlerClass))
+		{
+			MessageRegistry.INSTANCE.getMessageId(handlerClass);
+		}
+		
+		//noinspection unchecked
+		this.networkHandlerSetByMessageClass
+				.computeIfAbsent(handlerClass, missingHandlerClass -> new ConcurrentHashMap<>())
+				.computeIfAbsent(eventSource, missingEventSource -> ConcurrentHashMap.newKeySet())
+				.add((m) -> handlerImplementation.accept((T) m));
+	}
+	
+	protected void removeAllHandlers(AbstractNetworkEventSource eventSource)
+	{
+		for (ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>> handlerMap : this.networkHandlerSetByMessageClass.values())
+		{
+			handlerMap.remove(eventSource);
+		}
+	}
+	
+	
+	
+	//================//
+	// create message //
+	//================//
+	
+	protected <TResponse extends AbstractTrackableMessage> CompletableFuture<TResponse> createRequest(AbstractTrackableMessage msg, Class<TResponse> responseClass)
+	{
+		CompletableFuture<TResponse> responseFuture = new CompletableFuture<>();
+		responseFuture.whenComplete((response, throwable) ->
+		{
+			if (throwable instanceof CancellationException)
+			{
+				this.cancelledFutureIdSet.add(msg.futureId);
+				msg.sendResponse(new CancelMessage());
+			}
+			
+			if (!(throwable instanceof SessionClosedException))
+			{
+				this.pendingFutureById.remove(msg.futureId);
+			}
+		});
+		
+		this.pendingFutureById.put(msg.futureId, new FutureResponseData(responseClass, responseFuture));
+		
+		return responseFuture;
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	public void close()
+	{
+		this.networkHandlerSetByMessageClass.clear();
+		this.completeAllFuturesExceptionally(new SessionClosedException(this.getClass().getSimpleName() + " is closed."));
+	}
+	private void completeAllFuturesExceptionally(Throwable cause)
+	{
+		for (FutureResponseData responseData : this.pendingFutureById.values())
+		{
+			responseData.future.completeExceptionally(cause);
+		}
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class FutureResponseData
+	{
+		public final Class<? extends AbstractTrackableMessage> responseClass;
+		public final CompletableFuture<AbstractTrackableMessage> future;
+		
+		private <T extends AbstractTrackableMessage> FutureResponseData(Class<T> responseClass, CompletableFuture<T> future)
+		{
+			this.responseClass = responseClass;
+			//noinspection unchecked
+			this.future = (CompletableFuture<AbstractTrackableMessage>) future;
+		}
+		
+	}
+	
+	/** Simple wrapper just to make the code here a bit more readable */
+	@FunctionalInterface
+	private interface INetworkMessageConsumer 
+	{
+		void accept(AbstractNetworkMessage message);
+	}
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/event/ScopedNetworkEventSource.java

@@ -0,0 +1,81 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.event;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+
+import java.util.function.Consumer;
+
+/** 
+ * Provides a way to register network message handlers which are expected to be removed later. <br><br>
+ * 
+ * In other words, listeners can be added to this {@link AbstractNetworkEventSource} and when
+ * you no longer need any of those listeners you can {@link ScopedNetworkEventSource#close()}
+ * this handler to remove all of them.
+ */
+public final class ScopedNetworkEventSource extends AbstractNetworkEventSource
+{
+	public final AbstractNetworkEventSource parent;
+	private boolean isClosed = false;
+	
+	private final Consumer<AbstractNetworkMessage> actualHandleMessageStable = this::handleMessage;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ScopedNetworkEventSource(AbstractNetworkEventSource parent) { this.parent = parent; }
+	
+	
+	
+	//==================//
+	// message handlers //
+	//==================//
+	
+	@Override
+	public <T extends AbstractNetworkMessage> void registerHandler(Class<T> handlerClass, Consumer<T> handlerImplementation)
+	{
+		if (this.isClosed)
+		{
+			return;
+		}
+		
+		//noinspection unchecked
+		this.parent.registerHandler(this, handlerClass, (Consumer<T>) this.actualHandleMessageStable);
+		
+		super.registerHandler(this, handlerClass, handlerImplementation);
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.isClosed = true;
+		this.parent.removeAllHandlers(this);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/event/internal/AbstractInternalEvent.java

@@ -0,0 +1,17 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/** internal events are messages sent from the client/sever back to themselves. */
+public abstract class AbstractInternalEvent extends AbstractNetworkMessage
+{
+	@Override
+	public void encode(ByteBuf out)
+	{ throw new UnsupportedOperationException(this.getClass().getSimpleName() + " is an internal event, and cannot be sent."); }
+
+	@Override
+	public void decode(ByteBuf in)
+	{ throw new UnsupportedOperationException(this.getClass().getSimpleName() + " is an internal event, and cannot be received."); }
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/event/internal/CloseInternalEvent.java

@@ -0,0 +1,9 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+/**
+ * This event is used to indicate a disconnect.
+ */
+public class CloseInternalEvent extends AbstractInternalEvent
+{
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/event/internal/IncompatibleMessageInternalEvent.java

@@ -0,0 +1,15 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+/**
+ * This event is received instead of a message if its protocol version is incompatible with version the mod uses.
+ */
+public class IncompatibleMessageInternalEvent extends AbstractInternalEvent
+{
+	public final int protocolVersion;
+	
+	public IncompatibleMessageInternalEvent(int protocolVersion)
+	{
+		this.protocolVersion = protocolVersion;
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/event/internal/ProtocolErrorInternalEvent.java

@@ -0,0 +1,23 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * This event is used to indicate that encoding or decoding of a message threw an exception.
+ */
+public class ProtocolErrorInternalEvent extends AbstractInternalEvent
+{
+	public final Throwable reason;
+	@Nullable
+	public final AbstractNetworkMessage message;
+	public final boolean replyWithCloseReason;
+	
+	public ProtocolErrorInternalEvent(Throwable reason, @Nullable AbstractNetworkMessage message, boolean replyWithCloseReason)
+	{
+		this.reason = reason;
+		this.message = message;
+		this.replyWithCloseReason = replyWithCloseReason;
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/exceptions/InvalidLevelException.java

@@ -17,11 +17,10 @@
  *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package com.seibel.distanthorizons.core.network.protocol;
+package com.seibel.distanthorizons.core.network.exceptions;
 
-/** For now this is only used for constraining listeners */
-public interface INetworkMessage extends INetworkObject
+/** Fired if a user attempts to run an operation in a level they aren't currently in. */
+public class InvalidLevelException extends Exception
 {
-	
+	public InvalidLevelException(String message) { super(message); }
 }
-

core/src/main/java/com/seibel/distanthorizons/core/network/exceptions/RateLimitedException.java

@@ -17,12 +17,11 @@
  *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package com.seibel.distanthorizons.core.level;
+package com.seibel.distanthorizons.core.network.exceptions;
 
-import com.seibel.distanthorizons.core.file.fullDatafile.GeneratedFullDataSourceProvider;
-
-public interface IDhWorldGenLevel extends IDhLevel, GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener
+/** Fired if the client attempts to queue more tasks than the server is willing to handle. */
+public class RateLimitedException extends Exception
 {
-	void doWorldGen();
+	public RateLimitedException(String message) { super(message); }
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/network/exceptions/RequestRejectedException.java

@@ -0,0 +1,11 @@
+package com.seibel.distanthorizons.core.network.exceptions;
+
+/** 
+ * Fired if the client attempts an operation currently forbidden by the server. <Br>
+ * For example attempting to request LODs when world generation is disabled on the server. 
+ */
+public class RequestRejectedException extends Exception
+{
+	public RequestRejectedException(String message) { super(message); }
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/AbstractNetworkMessage.java

@@ -0,0 +1,31 @@
+package com.seibel.distanthorizons.core.network.messages;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+
+/** Any new implementing classes should be registered in {@link MessageRegistry} */
+public abstract class AbstractNetworkMessage implements INetworkObject
+{
+	//============//
+	// properties //
+	//============//
+	
+	private NetworkSession networkSession = null;
+	public NetworkSession getSession() { return this.networkSession; }
+	public void setSession(NetworkSession networkSession) { this.networkSession = networkSession; }
+	
+	public IServerPlayerWrapper serverPlayer() { return this.networkSession.serverPlayer; }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public String toString() { return this.toStringHelper().toString(); }
+	public MoreObjects.ToStringHelper toStringHelper() { return MoreObjects.toStringHelper(this); }
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/AbstractTrackableMessage.java

@@ -0,0 +1,162 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.api.internal.SharedApi;
+import com.seibel.distanthorizons.core.network.messages.requests.ExceptionMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.world.EWorldEnvironment;
+import io.netty.buffer.ByteBuf;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+public abstract class AbstractTrackableMessage extends AbstractNetworkMessage
+{
+	/** Tracks every message we've sent */
+	private static final AtomicInteger LAST_MESSAGE_ID_REF = new AtomicInteger();
+	
+	/**
+	 * 32 bits - NetworkSession ID (not transmitted) <br>
+	 * 1 bit - Requesting side (client - 0, server - 1) <br>
+	 * 31 bits - Request/Message ID <br><br>
+	 * 
+	 * SI = NetworkSession ID <br>
+	 * CS = Client/Server flag <br>
+	 * MI = Request/Message ID <br><br>
+	 * 
+	 * <code>
+	 * =======Bit layout=======	<br>
+	 * SI SI SI SI  SI SI SI SI <-- Top bits <br>
+	 * SI SI SI SI  SI SI SI SI	<br>
+	 * SI SI SI SI  SI SI SI SI	<br>
+	 * SI SI SI SI  SI SI SI SI	<br>
+	 * CS MI MI MI  MI MI MI MI	<br>
+	 * MI MI MI MI  MI MI MI MI	<br>
+	 * MI MI MI MI  MI MI MI MI	<br>
+	 * MI MI MI MI  MI MI MI MI <-- Bottom bits	<br>
+	 * </code>
+	 */
+	public long futureId;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public AbstractTrackableMessage()
+	{
+		EWorldEnvironment worldEnvironment = SharedApi.getEnvironment();
+		LodUtil.assertTrue(worldEnvironment != null, "Message can't be created if no world is loaded.");
+		
+		
+		// message/Request ID written as the least significant bits
+		long id = LAST_MESSAGE_ID_REF.getAndIncrement();
+		// write requesting side at bit 32
+		id |= ((worldEnvironment == EWorldEnvironment.Server_Only) ? 1 : 0) << 31;
+		this.futureId = id;
+	}
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	
+	protected abstract void encodeInternal(ByteBuf out) throws Exception;
+	protected abstract void decodeInternal(ByteBuf in) throws Exception;
+	
+	
+	
+	//=================//
+	// getters/setters //
+	//=================//
+	
+	@Override
+    public void setSession(NetworkSession networkSession)
+	{
+		super.setSession(networkSession);
+		// Session ID is written in the most significant bits
+		this.futureId |= (long) networkSession.id << 32;
+	}
+	
+	
+	
+	//==============//
+	// send message //
+	//==============//
+	
+	public void sendResponse(AbstractTrackableMessage responseMessage)
+	{
+		responseMessage.futureId = this.futureId;
+		this.getSession().sendMessage(responseMessage);
+	}
+	public void sendResponse(Exception e) { this.sendResponse(new ExceptionMessage(e)); }
+	
+	
+	
+	//=============//
+	// serializing //
+	//=============//
+	
+	@Override
+	public final void encode(ByteBuf out)
+	{
+		try
+		{
+			out.writeInt((int) this.futureId);
+			this.encodeInternal(out);
+		}
+		catch (Exception e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	@Override
+	public final void decode(ByteBuf in)
+	{
+		try
+		{
+			this.futureId = in.readInt();
+			this.decodeInternal(in);
+		}
+		catch (Exception e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override 
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("futureId", this.futureId);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/AckMessage.java

@@ -1,45 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.core.network.protocol.MessageRegistry;
-//import io.netty.buffer.ByteBuf;
-
-/**
- * Simple empty response message.
- * This message is not sent automatically.
- */
-public class AckMessage implements INetworkMessage
-{
-	public Class<? extends INetworkMessage> messageType;
-	
-	
-	
-	public AckMessage() { }
-	public AckMessage(Class<? extends INetworkMessage> messageType) { this.messageType = messageType; }
-
-//    @Override
-//    public void encode(ByteBuf out) { out.writeInt(MessageRegistry.INSTANCE.getMessageId(this.messageType)); }
-//	
-//    @Override
-//    public void decode(ByteBuf in) { this.messageType = MessageRegistry.INSTANCE.getMessageClassById(in.readInt()); }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/CloseMessage.java

@@ -1,38 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-//import io.netty.buffer.ByteBuf;
-
-/**
- * This is not a "real" message, and only used to indicate a disconnection.
- * To send a "disconnect reason" message, use {@link CloseReasonMessage}.
- */
-public class CloseMessage implements INetworkMessage
-{
-//    @Override
-//    public void encode(ByteBuf out) { throw new UnsupportedOperationException("CloseMessage is not a real message, and must not be sent."); }
-//
-//    @Override
-//    public void decode(ByteBuf in) { throw new UnsupportedOperationException("CloseMessage is not a real message, and must not be received."); }
-	
-}
-

core/src/main/java/com/seibel/distanthorizons/core/network/messages/CloseReasonMessage.java

@@ -1,41 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.core.network.protocol.INetworkObject;
-//import io.netty.buffer.ByteBuf;
-
-public class CloseReasonMessage implements INetworkMessage
-{
-	public String reason;
-	
-	
-	
-	public CloseReasonMessage() { }
-	public CloseReasonMessage(String reason) { this.reason = reason; }
-
-//	@Override
-//	public void encode(ByteBuf out) { INetworkObject.encodeString(this.reason, out); }
-//	
-//	@Override
-//	public void decode(ByteBuf in) { this.reason = INetworkObject.decodeString(in); }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/HelloMessage.java

@@ -1,38 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.coreapi.ModInfo;
-//import io.netty.buffer.ByteBuf;
-
-public class HelloMessage implements INetworkMessage
-{
-	public int version = ModInfo.PROTOCOL_VERSION;
-
-
-
-//    @Override
-//    public void encode(ByteBuf out) { out.writeInt(this.version); }
-//	
-//    @Override
-//    public void decode(ByteBuf in) { this.version = in.readInt(); }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/ILevelRelatedMessage.java

@@ -0,0 +1,23 @@
+package com.seibel.distanthorizons.core.network.messages;
+
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+
+/** Implemented by messages that handle level data */
+public interface ILevelRelatedMessage
+{
+	String getLevelName();
+	
+	/** Checks whether the message's level matches the given level. */
+	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
+	default boolean isSameLevelAs(ILevelWrapper levelWrapper)
+	{
+		if (levelWrapper instanceof IServerLevelWrapper)
+		{
+			return this.getLevelName().equals(((IServerLevelWrapper) levelWrapper).getKeyedLevelDimensionName());
+		}
+		
+		return this.getLevelName().equals(levelWrapper.getDimensionName());
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/MessageRegistry.java

@@ -0,0 +1,129 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import com.seibel.distanthorizons.core.network.messages.base.CodecCrashMessage;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
+import com.seibel.distanthorizons.core.network.messages.base.CloseReasonMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.ExceptionMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
+import com.seibel.distanthorizons.coreapi.ModInfo;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+/** Keeps track of every {@link AbstractNetworkMessage} so they can be (De)serialized. */
+public class MessageRegistry
+{
+	public static final boolean DEBUG_CODEC_CRASH_MESSAGE = ModInfo.IS_DEV_BUILD;
+	public static final MessageRegistry INSTANCE = new MessageRegistry();
+	
+	private final Map<Integer, Supplier<? extends AbstractNetworkMessage>> messageConstructorById = new HashMap<>();
+	private final BiMap<Class<? extends AbstractNetworkMessage>, Integer> messageClassById = HashBiMap.create();
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	private MessageRegistry()
+	{
+		// Note: Messages must have parameterless constructors
+		
+		this.registerMessage(CloseReasonMessage.class, CloseReasonMessage::new);
+		
+		// Level keys
+		this.registerMessage(CurrentLevelKeyMessage.class, CurrentLevelKeyMessage::new);
+		
+		// Config (for full DH support)
+		this.registerMessage(SessionConfigMessage.class, SessionConfigMessage::new);
+		
+		// Requests
+		this.registerMessage(CancelMessage.class, CancelMessage::new);
+		this.registerMessage(ExceptionMessage.class, ExceptionMessage::new);
+		
+		// Full data requests & updates
+		this.registerMessage(FullDataSourceRequestMessage.class, FullDataSourceRequestMessage::new);
+		this.registerMessage(FullDataSourceResponseMessage.class, FullDataSourceResponseMessage::new);
+		this.registerMessage(FullDataPartialUpdateMessage.class, FullDataPartialUpdateMessage::new);
+		this.registerMessage(FullDataSplitMessage.class, FullDataSplitMessage::new);
+		
+		// Debug messages are always last, and not included in release builds.
+		if (DEBUG_CODEC_CRASH_MESSAGE)
+		{
+			this.registerMessage(CodecCrashMessage.class, CodecCrashMessage::new);
+		}
+	}
+	
+	
+	
+	//==================//
+	// message handling //
+	//==================//
+	
+	public <T extends AbstractNetworkMessage> void registerMessage(Class<T> clazz, Supplier<T> supplier)
+	{
+		int id = this.messageConstructorById.size() + 1;
+		this.messageConstructorById.put(id, supplier);
+		this.messageClassById.put(clazz, id);
+	}
+	
+	/** used when decoding messages */
+	public AbstractNetworkMessage createMessage(int messageId) throws IllegalArgumentException
+	{
+		try
+		{
+			return this.messageConstructorById.get(messageId).get();
+		}
+		catch (NullPointerException e)
+		{
+			throw new IllegalArgumentException("Invalid message ID: " + messageId);
+		}
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	public int getMessageId(AbstractNetworkMessage message) { return this.getMessageId(message.getClass()); }
+	public int getMessageId(Class<? extends AbstractNetworkMessage> messageClass)
+	{
+		try
+		{
+			return this.messageClassById.get(messageClass);
+		}
+		catch (NullPointerException e)
+		{
+			throw new IllegalArgumentException("Message does not have ID assigned to it: [" + messageClass.getSimpleName() + "].");
+		}
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/PlayerUUIDMessage.java

@@ -1,46 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-//import io.netty.buffer.ByteBuf;
-
-import java.util.UUID;
-
-public class PlayerUUIDMessage implements INetworkMessage
-{
-	public UUID playerUUID;
-	
-	
-	
-	public PlayerUUIDMessage() { }
-	public PlayerUUIDMessage(UUID playerUUID) { this.playerUUID = playerUUID; }
-
-//    @Override
-//    public void encode(ByteBuf out)
-//	{
-//        out.writeLong(this.playerUUID.getMostSignificantBits());
-//        out.writeLong(this.playerUUID.getLeastSignificantBits());
-//    }
-//
-//    @Override
-//    public void decode(ByteBuf in) { this.playerUUID = new UUID(in.readLong(), in.readLong()); }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/RemotePlayerConfigMessage.java

@@ -1,42 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.messages;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkObject;
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.core.network.objects.RemotePlayer;
-//import io.netty.buffer.ByteBuf;
-
-public class RemotePlayerConfigMessage implements INetworkMessage
-{
-	public RemotePlayer.Payload payload;
-	
-	
-	
-	public RemotePlayerConfigMessage() { }
-	public RemotePlayerConfigMessage(RemotePlayer.Payload payload) { this.payload = payload; }
-
-//    @Override
-//    public void encode(ByteBuf out) { this.payload.encode(out); }
-//	
-//    @Override
-//    public void decode(ByteBuf in) { this.payload = INetworkObject.decode(new RemotePlayer.Payload(), in); }
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/base/CloseReasonMessage.java

@@ -0,0 +1,67 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.base;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/**
+ * When the communication is about to be stopped, either side can send this message
+ * There may be messages after this, but they should be ignored if possible.
+ */
+public class CloseReasonMessage extends AbstractNetworkMessage
+{
+	public String reason;
+
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public CloseReasonMessage() { }
+	public CloseReasonMessage(String reason) { this.reason = reason; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out) { this.writeString(this.reason, out); }
+	@Override
+	public void decode(ByteBuf in) { this.reason = this.readString(in); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("reason", this.reason);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/base/CodecCrashMessage.java

@@ -0,0 +1,86 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.base;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+public class CodecCrashMessage extends AbstractNetworkMessage
+{
+	public ECrashPhase crashPhase;
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public CodecCrashMessage() { }
+	public CodecCrashMessage(ECrashPhase crashPhase) { this.crashPhase = crashPhase; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out)
+	{
+		if (this.crashPhase == ECrashPhase.ENCODE)
+		{
+			throw new RuntimeException("encode force crash");
+		}
+	}
+
+	@Override
+	public void decode(ByteBuf in) { throw new RuntimeException("decode force crash"); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("crashPhase", this.crashPhase);
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/**
+	 * ENCODE, <br>
+	 * DECODE, <br>
+	 */
+	public enum ECrashPhase
+	{
+		ENCODE,
+		DECODE
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/base/CurrentLevelKeyMessage.java

@@ -0,0 +1,45 @@
+package com.seibel.distanthorizons.core.network.messages.base;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+public class CurrentLevelKeyMessage extends AbstractNetworkMessage
+{
+	public String levelKey;
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public CurrentLevelKeyMessage() { }
+	public CurrentLevelKeyMessage(String levelKey) { this.levelKey = levelKey; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out) { this.writeString(this.levelKey, out); }
+	
+	@Override
+	public void decode(ByteBuf in) { this.levelKey = this.readString(in); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("levelKey", this.levelKey);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/base/SessionConfigMessage.java

@@ -0,0 +1,67 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.base;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/** used for full DH support */
+public class SessionConfigMessage extends AbstractNetworkMessage
+{
+	public SessionConfig config;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public SessionConfigMessage() { }
+	public SessionConfigMessage(SessionConfig config) { this.config = config; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out) { this.config.encode(out); }
+	
+	@Override
+	public void decode(ByteBuf in) { this.config = INetworkObject.decodeToInstance(new SessionConfig(), in); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("config", this.config);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/fullData/FullDataPartialUpdateMessage.java

@@ -0,0 +1,84 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.fullData;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.messages.ILevelRelatedMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import io.netty.buffer.ByteBuf;
+
+public class FullDataPartialUpdateMessage extends AbstractNetworkMessage implements ILevelRelatedMessage
+{
+	public FullDataPayload payload;
+	
+	private String levelName;
+	@Override
+	public String getLevelName() { return this.levelName; }
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public FullDataPartialUpdateMessage() { }
+	public FullDataPartialUpdateMessage(IServerLevelWrapper level, FullDataPayload payload)
+	{
+		this.levelName = level.getKeyedLevelDimensionName();
+		this.payload = payload;
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out)
+	{
+		this.writeString(this.levelName, out);
+		this.payload.encode(out);
+	}
+	
+	@Override
+	public void decode(ByteBuf in)
+	{
+		this.levelName = this.readString(in);
+		this.payload = INetworkObject.decodeToInstance(new FullDataPayload(), in);
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("levelName", this.levelName)
+				.add("payload", this.payload);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/fullData/FullDataPayload.java

@@ -0,0 +1,127 @@
+package com.seibel.distanthorizons.core.network.messages.fullData;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.api.enums.config.EDhApiDataCompressionMode;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.util.TimerUtil;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Consumer;
+
+/**
+ * @see FullDataSplitMessage
+ */
+public class FullDataPayload implements INetworkObject
+{
+	private static final AtomicInteger lastBufferId = new AtomicInteger();
+	
+	// Reference counting is unreliable here for some reason so this is a "fix"
+	private static final Timer bufferCleanupTimer = TimerUtil.CreateTimer("FullDataBufferCleanupTimer");
+	
+	public int dtoBufferId;
+	public ByteBuf dtoBuffer;
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public FullDataPayload() { }
+	public FullDataPayload(@NotNull FullDataSourceV2 fullDataSource)
+	{
+		Objects.requireNonNull(fullDataSource);
+		
+		this.dtoBufferId = lastBufferId.getAndIncrement();
+		
+		try
+		{
+			EDhApiDataCompressionMode compressionMode = Config.Client.Advanced.LodBuilding.dataCompression.get();
+			FullDataSourceV2DTO dataSourceDto = FullDataSourceV2DTO.CreateFromDataSource(fullDataSource, compressionMode);
+			
+			this.dtoBuffer = ByteBufAllocator.DEFAULT.buffer();
+			dataSourceDto.encode(this.dtoBuffer);
+			
+			bufferCleanupTimer.schedule(new TimerTask()
+			{
+				@Override
+				public void run()
+				{
+					FullDataPayload.this.dtoBuffer.release();
+				}
+			}, 5000L);
+		}
+		catch (IOException e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out)
+	{
+		out.writeInt(this.dtoBufferId);
+	}
+	
+	@Override
+	public void decode(ByteBuf in)
+	{
+		this.dtoBufferId = in.readInt();
+	}
+	
+	/**
+	 * Used to send {@link FullDataPayload}'s since the data they contain may be larger
+	 * than what a single packet could contain.
+	 *
+	 * @param payloadChunkSizeInBytes how many bytes can be sent in a single message 
+	 */
+	public void splitAndSend(int payloadChunkSizeInBytes, Consumer<FullDataSplitMessage> sendMessageConsumer)
+	{
+		// chunk in this context means chunk of data, not a MC chunk
+		for (int payloadChunkNum = 0; ; payloadChunkNum++)
+		{
+			int offset = payloadChunkNum * payloadChunkSizeInBytes;
+			
+			int actualChunkSize = Math.min(this.dtoBuffer.writerIndex() - offset, payloadChunkSizeInBytes);
+			if (actualChunkSize <= 0)
+			{
+				break;
+			}
+			
+			FullDataSplitMessage chunk = new FullDataSplitMessage(this.dtoBufferId, payloadChunkNum == 0, this.dtoBuffer.slice(offset, actualChunkSize));
+			sendMessageConsumer.accept(chunk);
+		}
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public String toString()
+	{
+		return MoreObjects.toStringHelper(this)
+				.add("dtoBufferId", this.dtoBufferId)
+				.add("dtoBuffer", this.dtoBuffer)
+				.toString();
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/fullData/FullDataSourceRequestMessage.java

@@ -0,0 +1,96 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.fullData;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.ILevelRelatedMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import io.netty.buffer.ByteBuf;
+
+import javax.annotation.Nullable;
+
+public class FullDataSourceRequestMessage extends AbstractTrackableMessage implements ILevelRelatedMessage
+{
+	public long sectionPos;
+	
+	/** Only present when requesting changes. */
+	@Nullable
+	public Long clientTimestamp;
+	
+	private String levelName;
+	@Override
+	public String getLevelName() { return this.levelName; }
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public FullDataSourceRequestMessage() {}
+	public FullDataSourceRequestMessage(ILevelWrapper levelWrapper, long sectionPos, @Nullable Long clientTimestamp)
+	{
+		this.levelName = levelWrapper.getDimensionName();
+		this.sectionPos = sectionPos;
+		this.clientTimestamp = clientTimestamp;
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+    public void encodeInternal(ByteBuf out)
+	{
+		this.writeString(this.levelName, out);
+		out.writeLong(this.sectionPos);
+		if (this.writeOptional(out, this.clientTimestamp))
+		{
+			out.writeLong(this.clientTimestamp);
+		}
+    }
+
+    @Override
+    public void decodeInternal(ByteBuf in)
+	{
+		this.levelName = this.readString(in);
+		this.sectionPos = in.readLong();
+		this.clientTimestamp = this.readOptional(in, in::readLong);
+    }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("levelName", this.levelName)
+				.add("sectionPos", this.sectionPos)
+				.add("clientTimestamp", this.clientTimestamp);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/fullData/FullDataSourceResponseMessage.java

@@ -0,0 +1,83 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.fullData;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import io.netty.buffer.ByteBuf;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Response message, containing the requested full data source,
+ * or null if requested in updates-only mode and the data was not updated.
+ */
+public class FullDataSourceResponseMessage extends AbstractTrackableMessage
+{
+	@Nullable
+	public FullDataPayload payload;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public FullDataSourceResponseMessage() { }
+	public FullDataSourceResponseMessage(@Nullable FullDataPayload payload)
+	{
+		if (payload != null)
+		{
+			this.payload = payload;
+		}
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encodeInternal(ByteBuf out)
+	{
+		if (this.writeOptional(out, this.payload))
+		{
+			this.payload.encode(out);
+		}
+	}
+	
+	@Override
+	public void decodeInternal(ByteBuf in) { this.payload = this.readOptional(in, () -> INetworkObject.decodeToInstance(new FullDataPayload(), in)); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("payload", this.payload);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/fullData/FullDataSplitMessage.java

@@ -0,0 +1,94 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.fullData;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/**
+ * Used to send part of a {@link FullDataPayload}.
+ * 
+ * @see FullDataPayload
+ */
+public class FullDataSplitMessage extends AbstractNetworkMessage
+{
+	public int bufferId;
+	public ByteBuf buffer;
+	public boolean isFirst;
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public FullDataSplitMessage() { }
+	public FullDataSplitMessage(int bufferId, boolean isFirst, ByteBuf buffer)
+	{
+		this.bufferId = bufferId;
+		this.buffer = buffer;
+		this.isFirst = isFirst;
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out)
+	{
+		out.writeInt(this.bufferId);
+		
+		out.writeInt(this.buffer.writerIndex());
+		out.writeBytes(this.buffer.readerIndex(0));
+
+		out.writeBoolean(this.isFirst);
+	}
+	
+	@Override
+	public void decode(ByteBuf in)
+	{
+		this.bufferId = in.readInt();
+		
+		int bufferSize = in.readInt();
+		this.buffer = in.readBytes(bufferSize);
+
+		this.isFirst = in.readBoolean();
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("bufferId", this.bufferId)
+				.add("buffer", this.buffer)
+				.add("isFirst", this.isFirst);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/requests/CancelMessage.java

@@ -17,24 +17,20 @@
  *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package com.seibel.distanthorizons.core.network.messages;
+package com.seibel.distanthorizons.core.network.messages.requests;
 
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-//import io.netty.buffer.ByteBuf;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import io.netty.buffer.ByteBuf;
 
-public class RequestChunksMessage implements INetworkMessage
+public class CancelMessage extends AbstractTrackableMessage
 {
-
-//    @Override
-//    public void encode(ByteBuf out) 
-//	{
-//
-//    }
-//
-//    @Override
-//    public void decode(ByteBuf in) 
-//	{
-//
-//    }
+	public CancelMessage() { }
 	
-}
+	
+	
+	@Override
+	public void encodeInternal(ByteBuf out) { }
+	@Override
+	public void decodeInternal(ByteBuf in) { }
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/messages/requests/ExceptionMessage.java

@@ -0,0 +1,88 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.requests;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.exceptions.InvalidLevelException;
+import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
+import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import io.netty.buffer.ByteBuf;
+
+import java.util.ArrayList;
+import java.util.List;
+
+// TODO appears to be useless yelling at user
+public class ExceptionMessage extends AbstractTrackableMessage
+{
+	private static final List<Class<? extends Exception>> EXCEPTION_LIST = new ArrayList<Class<? extends Exception>>()
+	{{
+		// All exceptions here must include constructor: (String)
+		this.add(RateLimitedException.class);
+		this.add(InvalidLevelException.class);
+		this.add(RequestRejectedException.class);
+	}};
+	
+	public Exception exception;
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public ExceptionMessage() { }
+	public ExceptionMessage(Exception exception) { this.exception = exception; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override 
+	protected void encodeInternal(ByteBuf out)
+	{
+		out.writeInt(EXCEPTION_LIST.indexOf(this.exception.getClass()));
+		this.writeString(this.exception.getMessage(), out);
+	}
+	
+	@Override 
+	protected void decodeInternal(ByteBuf in) throws Exception
+	{
+		int id = in.readInt();
+		String message = this.readString(in);
+		this.exception = EXCEPTION_LIST.get(id).getDeclaredConstructor(String.class).newInstance(message);
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("exception", this.exception);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/network/objects/RemotePlayer.java

@@ -1,53 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.objects;
-
-import com.seibel.distanthorizons.core.network.protocol.INetworkObject;
-import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
-//import io.netty.buffer.ByteBuf;
-//import io.netty.channel.ChannelHandlerContext;
-
-public class RemotePlayer
-{
-	public IServerPlayerWrapper serverPlayer;
-	public Payload payload;
-//    public ChannelHandlerContext channelContext;
-	
-	
-	
-	public RemotePlayer(IServerPlayerWrapper serverPlayer) { this.serverPlayer = serverPlayer; }
-	
-	public static class Payload implements INetworkObject
-	{
-		// TODO Replace this example with useful fields, 
-		//  this should include any information the server needs to know about the connected client
-		public int renderDistance;
-
-
-
-//        @Override
-//        public void encode(ByteBuf out) { out.writeInt(this.renderDistance); }
-//		
-//        @Override
-//        public void decode(ByteBuf in) { this.renderDistance = in.readInt(); }
-		
-	}
-	
-}

core/src/main/java/com/seibel/distanthorizons/core/network/protocol/INetworkObject.java

@@ -1,50 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network.protocol;
-
-//import io.netty.buffer.ByteBuf;
-
-import java.nio.charset.StandardCharsets;
-
-public interface INetworkObject
-{
-//	void encode(ByteBuf out);
-//	
-//	void decode(ByteBuf in);
-//	
-//	static <T extends INetworkObject> T decode(T obj, ByteBuf inputByteBuf)
-//	{
-//		obj.decode(inputByteBuf);
-//		return obj;
-//	}
-//	
-//	static void encodeString(String inputString, ByteBuf outputByteBuf)
-//	{
-//		outputByteBuf.writeShort(inputString.length());
-//		outputByteBuf.writeBytes(inputString.getBytes(StandardCharsets.UTF_8));
-//	}
-//	
-//	static String decodeString(ByteBuf inputByteBuf)
-//	{
-//		int length = inputByteBuf.readShort();
-//		return inputByteBuf.readBytes(length).toString(StandardCharsets.UTF_8);
-//	}
-	
-}