James Seibel
428 lines
13 KiB
Java
428 lines
13 KiB
Java
/*
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* This file is part of the LOD Mod, licensed under the GNU GPL v3 License.
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*
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* Copyright (C) 2020 James Seibel
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.seibel.lod.builders;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.lwjgl.opengl.GL11;
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import com.seibel.lod.builders.worldGeneration.LodChunkGenWorker;
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import com.seibel.lod.handlers.LodConfig;
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import com.seibel.lod.objects.LodChunk;
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import com.seibel.lod.objects.LodDimension;
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import com.seibel.lod.objects.NearFarBuffer;
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import com.seibel.lod.render.LodRenderer;
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import com.seibel.lod.util.LodUtil;
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import net.minecraft.client.Minecraft;
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import net.minecraft.client.renderer.BufferBuilder;
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import net.minecraft.util.math.ChunkPos;
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import net.minecraft.world.server.ServerWorld;
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import net.minecraftforge.common.WorldWorkerManager;
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/**
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* This object is used to create NearFarBuffer objects.
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*
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* @author James Seibel
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* @version 07-25-2021
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*/
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public class LodBufferBuilder
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{
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private Minecraft mc;
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/** This holds the thread used to generate new LODs off the main thread. */
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private ExecutorService genThread = Executors.newSingleThreadExecutor();
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private LodChunkBuilder lodChunkBuilder;
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/** The buffers that are used to create LODs using near fog */
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public volatile BufferBuilder buildableNearBuffer;
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/** The buffers that are used to create LODs using far fog */
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public volatile BufferBuilder buildableFarBuffer;
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/** if this is true the LOD buffers are currently being
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* regenerated. */
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public volatile boolean generatingBuffers = false;
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/** if this is true new LOD buffers have been generated
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* and are waiting to be swapped with the drawable buffers*/
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private volatile boolean switchBuffers = false;
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/** This keeps track of how many chunk generation requests are on going.
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* This is to prevent chunks from being generated for a long time in an area
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* the player is no longer in. */
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public volatile AtomicInteger numberOfChunksWaitingToGenerate = new AtomicInteger(0);
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/** how many chunks to generate outside of the player's
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* view distance at one time. (or more specifically how
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* many requests to make at one time).
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* I multiply by 8 to make sure there is always a buffer of chunk requests,
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* to make sure the CPU is always busy and we can generate LODs as quickly as
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* possible. */
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public int maxChunkGenRequests = LodConfig.CLIENT.numberOfWorldGenerationThreads.get() * 8;
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public LodBufferBuilder(LodChunkBuilder newLodBuilder)
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{
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mc = Minecraft.getInstance();
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lodChunkBuilder = newLodBuilder;
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}
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/**
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* Create a thread to asynchronously generate LOD buffers
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* centered around the given camera X and Z.
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* <br>
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* This method will write to the drawable near and far buffers.
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* <br>
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* After the buildable buffers have been generated they must be
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* swapped with the drawable buffers in the LodRenderer to be drawn.
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*/
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public void generateLodBuffersAsync(LodRenderer renderer, LodDimension lodDim,
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double playerX, double playerZ, int numbChunksWide)
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{
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// only allow one generation process to happen at a time
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if (generatingBuffers)
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return;
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if (buildableNearBuffer == null || buildableFarBuffer == null)
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throw new IllegalStateException("generateLodBuffersAsync was called before the buildableNearBuffer and buildableFarBuffer were created.");
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generatingBuffers = true;
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// this seemingly useless math is required,
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// just using (int) playerX/Z doesn't work
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int playerXChunkOffset = ((int) playerX / LodChunk.WIDTH) * LodChunk.WIDTH;
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int playerZChunkOffset = ((int) playerZ / LodChunk.WIDTH) * LodChunk.WIDTH;
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// this is where we will start drawing squares
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// (exactly half the total width)
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int startX = (-LodChunk.WIDTH * (numbChunksWide / 2)) + playerXChunkOffset;
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int startZ = (-LodChunk.WIDTH * (numbChunksWide / 2)) + playerZChunkOffset;
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Thread thread = new Thread(()->
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{
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// index of the chunk currently being added to the
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// generation list
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int chunkGenIndex = 0;
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ChunkPos[] chunksToGen = new ChunkPos[maxChunkGenRequests];
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// if we don't have a full number of chunks to generate in chunksToGen
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// we can top it off from the reserve
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ChunkPos[] chunksToGenReserve = new ChunkPos[maxChunkGenRequests];
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int minChunkDist = Integer.MAX_VALUE;
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ChunkPos playerChunkPos = new ChunkPos((int)playerX / LodChunk.WIDTH, (int)playerZ / LodChunk.WIDTH);
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// generate our new buildable buffers
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buildableNearBuffer.begin(GL11.GL_QUADS, LodRenderer.LOD_VERTEX_FORMAT);
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buildableFarBuffer.begin(GL11.GL_QUADS, LodRenderer.LOD_VERTEX_FORMAT);
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// x axis
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for (int i = 0; i < numbChunksWide; i++)
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{
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// z axis
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for (int j = 0; j < numbChunksWide; j++)
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{
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int chunkX = i + (startX / LodChunk.WIDTH);
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int chunkZ = j + (startZ / LodChunk.WIDTH);
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// skip any chunks that Minecraft is going to render
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if(isCoordInCenterArea(i, j, (numbChunksWide / 2))
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&& renderer.vanillaRenderedChunks.contains(new ChunkPos(chunkX, chunkZ)))
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{
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continue;
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}
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// set where this square will be drawn in the world
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double xOffset = (LodChunk.WIDTH * i) + // offset by the number of LOD blocks
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startX; // offset so the center LOD block is centered underneath the player
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double yOffset = 0;
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double zOffset = (LodChunk.WIDTH * j) + startZ;
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LodChunk lod = lodDim.getLodFromCoordinates(chunkX, chunkZ);
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if (lod == null || lod.isLodEmpty())
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{
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// generate a new chunk if no chunk currently exists
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// and we aren't waiting on any other chunks to generate
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if (lod == null && numberOfChunksWaitingToGenerate.get() < maxChunkGenRequests)
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{
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ChunkPos pos = new ChunkPos(chunkX, chunkZ);
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// can be used for debugging
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// if (chunksToGen == null)
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// {
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// chunkGenIndex = 0;
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// chunksToGen = new ChunkPos[maxChunkGenRequests];
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// }
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//
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// if (chunkGenIndex < maxChunkGenRequests)
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// {
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// chunksToGen[chunkGenIndex] = pos;
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// chunkGenIndex++;
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// }
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// determine if this position is closer to the player
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// than the previous
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int newDistance = playerChunkPos.getChessboardDistance(pos);
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// issue #40
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// TODO optimize this code,
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// using the purely optimized code above we can achieve close to
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// 100% CPU utilization, this code generally achieves 40 - 50%
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// after a certain point; and I'm sure there is a better data
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// structure for this.
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if (newDistance < minChunkDist)
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{
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// this chunk is closer, clear any previous
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// positions and update the new minimum distance
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minChunkDist = newDistance;
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// move all the old chunks into the reserve
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ChunkPos[] newReserve = new ChunkPos[maxChunkGenRequests];
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int oldToGenIndex = 0;
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int oldReserveIndex = 0;
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for(int tmpIndex = 0; tmpIndex < newReserve.length; tmpIndex++)
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{
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// we don't check if the boundaries are good since
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// the tmp array will always be the same length
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// as chunksToGen and chunksToGenReserve
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if (chunksToGen[oldToGenIndex] != null)
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{
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// add all the closest chunks...
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newReserve[tmpIndex] = chunksToGen[oldToGenIndex];
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oldToGenIndex++;
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}
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else if (chunksToGenReserve[oldReserveIndex] != null)
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{
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// ...then add all the previous reserve chunks
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// (which are farther away)
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newReserve[tmpIndex] = chunksToGenReserve[oldToGenIndex];
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oldReserveIndex++;
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}
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else
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{
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// we have moved all the items from
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// the old chunksToGen and reserve
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break;
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}
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}
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chunksToGenReserve = newReserve;
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chunkGenIndex = 0;
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chunksToGen = new ChunkPos[maxChunkGenRequests];
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chunksToGen[chunkGenIndex] = pos;
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chunkGenIndex++;
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}
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else if (newDistance <= minChunkDist)
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{
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// this chunk position is as close or closers than the
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// minimum distance
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if(chunkGenIndex < maxChunkGenRequests)
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{
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// we are still under the number of chunks to generate
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// add this position to the list
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chunksToGen[chunkGenIndex] = pos;
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chunkGenIndex++;
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}
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}
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} // lod null and can generate more chunks
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// don't render this null/empty chunk
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continue;
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} // lod null or empty
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BufferBuilder currentBuffer = null;
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if (isCoordinateInNearFogArea(i, j, numbChunksWide / 2))
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currentBuffer = buildableNearBuffer;
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else
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currentBuffer = buildableFarBuffer;
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// get the desired LodTemplate and
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// add this LOD to the buffer
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LodConfig.CLIENT.lodTemplate.get().
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template.addLodToBuffer(currentBuffer, lodDim, lod,
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xOffset, yOffset, zOffset, renderer.debugging);
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}
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}
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// issue #19
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// TODO add a way for a server side mod to generate chunks requested here
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if(mc.hasSingleplayerServer())
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{
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ServerWorld serverWorld = LodUtil.getServerWorldFromDimension(lodDim.dimension);
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// make sure we have as many chunks to generate as we are allowed
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if (chunkGenIndex < maxChunkGenRequests)
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{
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for(int i = chunkGenIndex, j = 0; i < maxChunkGenRequests; i++, j++)
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{
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chunksToGen[i] = chunksToGenReserve[j];
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}
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}
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// start chunk generation
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for(ChunkPos chunkPos : chunksToGen)
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{
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if(chunkPos == null)
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break;
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// make sure we don't generate this chunk again
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lodDim.addLod(new LodChunk(chunkPos));
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numberOfChunksWaitingToGenerate.addAndGet(1);
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LodChunkGenWorker genWorker = new LodChunkGenWorker(chunkPos, renderer, lodChunkBuilder, this, lodDim, serverWorld);
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WorldWorkerManager.addWorker(genWorker);
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}
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}
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// finish the buffer building
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buildableNearBuffer.end();
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buildableFarBuffer.end();
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// mark that the buildable buffers as ready to swap
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generatingBuffers = false;
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switchBuffers = true;
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});
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genThread.execute(thread);
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return;
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}
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//====================//
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// generation helpers //
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//====================//
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/**
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* Returns if the given coordinate is in the loaded area of the world.
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* @param centerCoordinate the center of the loaded world
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*/
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private boolean isCoordInCenterArea(int i, int j, int centerCoordinate)
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{
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return (i >= centerCoordinate - mc.options.renderDistance
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&& i <= centerCoordinate + mc.options.renderDistance)
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&&
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(j >= centerCoordinate - mc.options.renderDistance
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&& j <= centerCoordinate + mc.options.renderDistance);
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}
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/**
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* Find the coordinates that are in the center half of the given
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* 2D matrix, starting at (0,0) and going to (2 * lodRadius, 2 * lodRadius).
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*/
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private static boolean isCoordinateInNearFogArea(int chunkX, int chunkZ, int lodRadius)
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{
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int halfRadius = lodRadius / 2;
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return (chunkX >= lodRadius - halfRadius
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&& chunkX <= lodRadius + halfRadius)
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&&
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(chunkZ >= lodRadius - halfRadius
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&& chunkZ <= lodRadius + halfRadius);
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}
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//===============================//
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// BufferBuilder related methods //
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//===============================//
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/**
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* Called from the LodRenderer to create the
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* BufferBuilders at the right size.
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*
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* @param bufferMaxCapacity
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*/
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public void setupBuffers(int bufferMaxCapacity)
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{
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buildableNearBuffer = new BufferBuilder(bufferMaxCapacity);
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buildableFarBuffer = new BufferBuilder(bufferMaxCapacity);
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}
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/**
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* Swap the drawable and buildable buffers and return
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* the old drawable buffers.
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* @param drawableNearBuffer
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* @param drawableFarBuffer
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*/
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public NearFarBuffer swapBuffers(BufferBuilder drawableNearBuffer, BufferBuilder drawableFarBuffer)
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{
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// swap the BufferBuilders
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BufferBuilder tmp = buildableNearBuffer;
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buildableNearBuffer = drawableNearBuffer;
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drawableNearBuffer = tmp;
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tmp = buildableFarBuffer;
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buildableFarBuffer = drawableFarBuffer;
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drawableFarBuffer = tmp;
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// the buffers have been swapped
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switchBuffers = false;
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return new NearFarBuffer(drawableNearBuffer, drawableFarBuffer);
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}
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/**
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* If this is true the buildable near and far
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* buffers have been generated and are ready to be
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* sent to the LodRenderer.
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*/
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public boolean newBuffersAvaliable()
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{
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return switchBuffers;
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}
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} |