Multiloader V

fabric is working

common/build.gradle.kts

@@ -14,7 +14,8 @@ dependencies {
 	modImplementation(libs.fl)
 
 	// required for proper remapping and compiling
-	//modCompileOnly(libs.fapi) // TODO: try removing this and seeing if that breaks stuff
+	modCompileOnly(libs.fapi)
+	compileOnly(libs.jsr305)
 
 	modCompileOnly(libs.sodium.fabric)
 

common/src/main/java/io/github/slimeistdev/crystalline_sky/CrystallineSky.java

@@ -1,14 +1,17 @@
 package io.github.slimeistdev.crystalline_sky;
 
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
 import net.minecraft.core.Registry;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.ApiStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class CrystallineSky {
 	public static final String ID = "crystalline_sky";
 	public static final Logger LOG = LoggerFactory.getLogger(ID);
+	private static final CatnipRegistry REGISTRY = new CatnipRegistry(ID);
 
 	public static void init() {
 		ModSetup.init();
@@ -21,4 +24,9 @@ public class CrystallineSky {
 	public static <T> ResourceKey<T> key(ResourceKey<? extends Registry<T>> registryKey, String path) {
 		return ResourceKey.create(registryKey, id(path));
 	}
+
+	@ApiStatus.Internal
+	public static CatnipRegistry registry() {
+		return REGISTRY;
+	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/CrystallineSkyClient.java

@@ -31,7 +31,7 @@ public class CrystallineSkyClient {
 
 	public static void init() {
 		ClientPlatformHelper.registerItemProperty(
-			CrystallineItems.SKY_LIGHT,
+			CrystallineItems.SKY_LIGHT.value(),
 			ResourceLocation.withDefaultNamespace("level"),
 			(stack, world, entity, seed) -> {
 				BlockItemStateProperties state = stack.getOrDefault(DataComponents.BLOCK_STATE, BlockItemStateProperties.EMPTY);

common/src/main/java/io/github/slimeistdev/crystalline_sky/compat/Mods.java

@@ -1,6 +1,6 @@
 package io.github.slimeistdev.crystalline_sky.compat;
 
-import net.fabricmc.loader.api.FabricLoader;
+import dev.architectury.injectables.annotations.ExpectPlatform;
 
 import java.util.Optional;
 import java.util.function.Supplier;
@@ -14,7 +14,12 @@ public enum Mods {
 
 	Mods(String id) {
 		this.id = id;
-		this.isLoaded = FabricLoader.getInstance().isModLoaded(id);
+		this.isLoaded = isModLoaded(id);
+	}
+
+	@ExpectPlatform
+	public static boolean isModLoaded(String id) {
+		throw new AssertionError();
 	}
 
 	/**

common/src/main/java/io/github/slimeistdev/crystalline_sky/compat/sodium/SkyShaderInterface.java

@@ -53,10 +53,8 @@ public class SkyShaderInterface implements ChunkShaderInterface {
 		Minecraft client = Minecraft.getInstance();
 		if (client.level != null
 			&& client.player != null
-			&& (client.player.getMainHandItem().is(CrystallineItems.SKY)
+			&& (CrystallineItems.isSky(client.player.getMainHandItem())
-			|| client.player.getOffhandItem().is(CrystallineItems.SKY)
+			|| CrystallineItems.isSky(client.player.getOffhandItem()))) {
-			|| client.player.getMainHandItem().is(CrystallineItems.WEEPING_SKY)
-			|| client.player.getOffhandItem().is(CrystallineItems.WEEPING_SKY))) {
 
 			float f = client.level.getGameTime() + client.getTimer().getGameTimeDeltaPartialTick(true);
 			float alpha = (Mth.sin(f / 10.0f) + 1.0f) / 2.0f;

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/blocks/SkyBlock.java

@@ -0,0 +1,9 @@
+package io.github.slimeistdev.crystalline_sky.content.blocks;
+
+import net.minecraft.world.level.block.TransparentBlock;
+
+public class SkyBlock extends TransparentBlock {
+	public SkyBlock(Properties properties) {
+		super(properties);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/blocks/SkyLightBlock.java

@@ -1,14 +1,13 @@
 package io.github.slimeistdev.crystalline_sky.content.blocks;
 
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineItems;
-import net.minecraft.world.level.block.state.BlockBehaviour.Properties;
-import net.minecraft.world.level.block.state.BlockState;
-import net.minecraft.world.level.block.LightBlock;
-import net.minecraft.world.phys.shapes.CollisionContext;
 import net.minecraft.core.BlockPos;
-import net.minecraft.world.phys.shapes.VoxelShape;
-import net.minecraft.world.phys.shapes.Shapes;
 import net.minecraft.world.level.BlockGetter;
+import net.minecraft.world.level.block.LightBlock;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.phys.shapes.CollisionContext;
+import net.minecraft.world.phys.shapes.Shapes;
+import net.minecraft.world.phys.shapes.VoxelShape;
 
 public class SkyLightBlock extends LightBlock {
 	public SkyLightBlock(Properties settings) {
@@ -17,6 +16,6 @@ public class SkyLightBlock extends LightBlock {
 
 	@Override
 	protected VoxelShape getShape(BlockState state, BlockGetter world, BlockPos pos, CollisionContext context) {
-		return context.isHoldingItem(CrystallineItems.SKY_LIGHT) ? Shapes.block() : Shapes.empty();
+		return context.isHoldingItem(CrystallineItems.SKY_LIGHT.value()) ? Shapes.block() : Shapes.empty();
 	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/blocks/WeepingSkyLightBlock.java

@@ -1,23 +1,22 @@
 package io.github.slimeistdev.crystalline_sky.content.blocks;
 
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineItems;
-import net.minecraft.world.level.block.Block;
-import net.minecraft.world.level.block.RenderShape;
-import net.minecraft.world.level.block.state.BlockBehaviour.Properties;
-import net.minecraft.world.level.block.state.BlockState;
-import net.minecraft.world.phys.shapes.CollisionContext;
-import net.minecraft.world.level.block.SimpleWaterloggedBlock;
-import net.minecraft.world.level.material.FluidState;
-import net.minecraft.world.level.material.Fluids;
-import net.minecraft.world.level.block.state.StateDefinition;
-import net.minecraft.world.level.block.state.properties.BooleanProperty;
-import net.minecraft.world.level.block.state.properties.BlockStateProperties;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
-import net.minecraft.world.phys.shapes.VoxelShape;
-import net.minecraft.world.phys.shapes.Shapes;
 import net.minecraft.world.level.BlockGetter;
 import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.RenderShape;
+import net.minecraft.world.level.block.SimpleWaterloggedBlock;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.BooleanProperty;
+import net.minecraft.world.level.material.FluidState;
+import net.minecraft.world.level.material.Fluids;
+import net.minecraft.world.phys.shapes.CollisionContext;
+import net.minecraft.world.phys.shapes.Shapes;
+import net.minecraft.world.phys.shapes.VoxelShape;
 
 public class WeepingSkyLightBlock extends Block implements SimpleWaterloggedBlock {
 	public static final BooleanProperty WATERLOGGED = BlockStateProperties.WATERLOGGED;
@@ -34,7 +33,7 @@ public class WeepingSkyLightBlock extends Block implements SimpleWaterloggedBloc
 
 	@Override
 	protected VoxelShape getShape(BlockState state, BlockGetter world, BlockPos pos, CollisionContext context) {
-		return context.isHoldingItem(CrystallineItems.WEEPING_SKY_LIGHT) ? Shapes.block() : Shapes.empty();
+		return context.isHoldingItem(CrystallineItems.WEEPING_SKY_LIGHT.value()) ? Shapes.block() : Shapes.empty();
 	}
 
 	@Override

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/blocks/package-info.java

@@ -0,0 +1,3 @@
+@javax.annotation.ParametersAreNonnullByDefault
+@net.minecraft.MethodsReturnNonnullByDefault
+package io.github.slimeistdev.crystalline_sky.content.blocks;

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/items/WeepingSkyBlockItem.java

@@ -1,18 +1,18 @@
 package io.github.slimeistdev.crystalline_sky.content.items;
 
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineDataComponentTypes;
-import net.minecraft.world.item.Item.Properties;
+import net.minecraft.core.BlockPos;
-import net.minecraft.world.level.block.Block;
+import net.minecraft.server.level.ColumnPos;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.InteractionResultHolder;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.BlockItem;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.context.UseOnContext;
-import net.minecraft.world.InteractionResult;
-import net.minecraft.world.InteractionHand;
-import net.minecraft.world.InteractionResultHolder;
-import net.minecraft.core.BlockPos;
-import net.minecraft.server.level.ColumnPos;
 import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import org.jetbrains.annotations.NotNull;
 
 public class WeepingSkyBlockItem extends BlockItem {
 	public WeepingSkyBlockItem(Block block, Properties settings) {
@@ -20,9 +20,9 @@ public class WeepingSkyBlockItem extends BlockItem {
 	}
 
 	@Override
-	public InteractionResult useOn(UseOnContext context) {
+	public @NotNull InteractionResult useOn(UseOnContext context) {
 		ItemStack stack = context.getItemInHand();
-		if (stack.get(CrystallineDataComponentTypes.WEEPING_SKY_DEBUG_COLUMN_TOOL) != null) {
+		if (stack.get(CrystallineDataComponentTypes.WEEPING_SKY_DEBUG_COLUMN_TOOL.value()) != null) {
 			if (context.getLevel().isClientSide) {
 				BlockPos pos = context.getClickedPos();
 				WeepingSkyBlockItemClient.setSelectedColumn(new ColumnPos(pos.getX(), pos.getZ()));
@@ -34,9 +34,9 @@ public class WeepingSkyBlockItem extends BlockItem {
 	}
 
 	@Override
-	public InteractionResultHolder<ItemStack> use(Level world, Player user, InteractionHand hand) {
+	public @NotNull InteractionResultHolder<ItemStack> use(Level world, Player user, InteractionHand hand) {
 		ItemStack stack = user.getItemInHand(hand);
-		if (stack.get(CrystallineDataComponentTypes.WEEPING_SKY_DEBUG_COLUMN_TOOL) != null) {
+		if (stack.get(CrystallineDataComponentTypes.WEEPING_SKY_DEBUG_COLUMN_TOOL.value()) != null) {
 			if (world.isClientSide) {
 				WeepingSkyBlockItemClient.setSelectedColumn(null);
 			}

common/src/main/java/io/github/slimeistdev/crystalline_sky/content/items/package-info.java

@@ -0,0 +1,3 @@
+@javax.annotation.ParametersAreNonnullByDefault
+@net.minecraft.MethodsReturnNonnullByDefault
+package io.github.slimeistdev.crystalline_sky.content.items;

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/CatnipRegistry.java

@@ -0,0 +1,63 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration;
+
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multimaps;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.builder.BlockBuilder;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.builder.DataComponentTypeBuilder;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.builder.ItemBuilder;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BaseHolder;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BlockHolder;
+import net.minecraft.core.Registry;
+import net.minecraft.world.item.BlockItem;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.BlockBehaviour;
+import org.jetbrains.annotations.ApiStatus;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+public class CatnipRegistry {
+	public final String modId;
+
+	private static final Multimap<Registry<?>, Registration<?, ?, ?>> REGISTRATIONS = HashMultimap.create();
+	public static final Multimap<Registry<?>, Registration<?, ?, ?>> REGISTRATIONS_VIEW = Multimaps.unmodifiableMultimap(REGISTRATIONS);
+
+	public CatnipRegistry(String modId) {
+		this.modId = modId;
+	}
+
+	@ApiStatus.Internal
+	public static <R, T extends R, H extends BaseHolder<T>> void addToRegistrationMap(Registry<R> registry, Registration<R, T, H> registration) {
+		REGISTRATIONS.put(registry, registration);
+	}
+
+	public <T> DataComponentTypeBuilder<T> dataComponentType(String id) {
+		return new DataComponentTypeBuilder<>(this, id);
+	}
+
+	public BlockBuilder<Block> block(String id) {
+		return block(id, Block::new);
+	}
+
+	public <R extends Block> BlockBuilder<R> block(String id, Function<BlockBehaviour.Properties, R> factory) {
+		return new BlockBuilder<>(this, id, factory);
+	}
+
+	public ItemBuilder<Item> item(String id) {
+		return item(id, Item::new);
+	}
+
+	public <R extends Item> ItemBuilder<R> item(String id, Function<Item.Properties, R> factory) {
+		return new ItemBuilder<>(this, id, factory);
+	}
+
+	public <B extends Block> ItemBuilder<BlockItem> item(BlockHolder<B> block) {
+		return item(block, BlockItem::new);
+	}
+
+	public <R extends BlockItem, B extends Block> ItemBuilder<R> item(BlockHolder<B> block, BiFunction<? super B, Item.Properties, R> factory) {
+		return new ItemBuilder<>(this, block.getRegisteredNamePath(), properties -> factory.apply(block.value(), properties));
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/Registration.java

@@ -0,0 +1,24 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration;
+
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BaseHolder;
+import io.github.slimeistdev.crystalline_sky.mixin.Holder$ReferenceAccessor;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceLocation;
+
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+public record Registration<R, T extends R, H extends BaseHolder<T>>(
+	ResourceLocation id,
+	Registry<R> registry,
+	Supplier<T> value,
+	H holder,
+	Consumer<H> afterRegisterCallback
+) {
+	@SuppressWarnings("unchecked")
+	public void register() {
+		T registered = Registry.register(registry, id, value.get());
+		((Holder$ReferenceAccessor<T>) holder).crystalline_sky$bindValue(registered);
+		afterRegisterCallback.accept(holder);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/RegistrationListeners.java

@@ -0,0 +1,28 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration;
+
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Consumer;
+
+public class RegistrationListeners<T> {
+	private @Nullable T obj;
+	private @Nullable Consumer<T> cons;
+
+	public void registered(T obj) {
+		this.obj = obj;
+		if (cons != null) {
+			cons.accept(obj);
+			cons = null;
+		}
+	}
+
+	public void addListener(Consumer<? super T> consumer) {
+		if (obj != null) {
+			consumer.accept(obj);
+		} else if (cons == null) {
+			cons = consumer::accept;
+		} else {
+			cons = cons.andThen(consumer);
+		}
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/builder/AbstractBuilder.java

@@ -0,0 +1,49 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.builder;
+
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.Registration;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BaseHolder;
+import io.github.slimeistdev.crystalline_sky.multiloader.Loader;
+import net.minecraft.core.HolderOwner;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Consumer;
+
+public abstract class AbstractBuilder<R, T extends R, H extends BaseHolder<T>> {
+	protected final CatnipRegistry owner;
+	protected final ResourceLocation id;
+	protected final Registry<R> registry;
+	protected @Nullable H holder;
+	private Consumer<H> afterRegisterCallback = h -> h.getInternalRegistrationListener().accept(h.value());
+
+	public AbstractBuilder(CatnipRegistry owner, String name, Registry<R> registry) {
+		this.owner = owner;
+		this.id = ResourceLocation.fromNamespaceAndPath(owner.modId, name);
+		this.registry = registry;
+	}
+
+	public void chainAfterRegisterCallback(Consumer<H> callback) {
+		afterRegisterCallback = afterRegisterCallback.andThen(callback);
+	}
+
+	abstract T build();
+
+	abstract H getHolder(HolderOwner<R> owner, ResourceKey<R> key);
+
+	public H register() {
+		ResourceKey<R> key = ResourceKey.create(registry.key(), id);
+		holder = getHolder(registry.holderOwner(), key);
+		Registration<R, T, H> registration = new Registration<>(id, registry, this::build, holder, afterRegisterCallback);
+
+		if (Loader.FABRIC.isCurrent()) {
+			registration.register();
+		} else {
+			CatnipRegistry.addToRegistrationMap(registry, registration);
+		}
+
+		return holder;
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/builder/BlockBuilder.java

@@ -0,0 +1,47 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.builder;
+
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BlockHolder;
+import net.minecraft.core.HolderOwner;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.BlockBehaviour;
+import net.minecraft.world.level.block.state.BlockBehaviour.Properties;
+
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class BlockBuilder<T extends Block> extends AbstractBuilder<Block, T, BlockHolder<T>> {
+	private final Function<Properties, T> factory;
+	private Supplier<Properties> initialProperties = Properties::of;
+	private Function<Properties, Properties> properties = Function.identity();
+
+	public BlockBuilder(CatnipRegistry owner, String name, Function<Properties, T> factory) {
+		super(owner, name, BuiltInRegistries.BLOCK);
+		this.factory = factory;
+	}
+
+	public BlockBuilder<T> initialProperties(Supplier<? extends BlockBehaviour> block) {
+		initialProperties = () -> Properties.ofFullCopy(block.get());
+		return this;
+	}
+
+	public BlockBuilder<T> properties(Function<Properties, Properties> properties) {
+		this.properties = this.properties.andThen(properties);
+		return this;
+	}
+
+	@Override
+	T build() {
+		Properties properties = initialProperties.get();
+		properties = this.properties.apply(properties);
+		return factory.apply(properties);
+	}
+
+	@Override
+	BlockHolder<T> getHolder(HolderOwner<Block> owner, ResourceKey<Block> key) {
+		//noinspection unchecked
+		return (BlockHolder<T>) new BlockHolder<>(owner, key);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/builder/DataComponentTypeBuilder.java

@@ -0,0 +1,46 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.builder;
+
+import com.mojang.serialization.Codec;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.DataComponentTypeHolder;
+import net.minecraft.core.HolderOwner;
+import net.minecraft.core.component.DataComponentType;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.resources.ResourceKey;
+
+public class DataComponentTypeBuilder<T> extends AbstractBuilder<DataComponentType<?>, DataComponentType<T>, DataComponentTypeHolder<T>> {
+	private final DataComponentType.Builder<T> builder;
+
+	public DataComponentTypeBuilder(CatnipRegistry owner, String name) {
+		super(owner, name, BuiltInRegistries.DATA_COMPONENT_TYPE);
+		this.builder = DataComponentType.builder();
+	}
+
+	public DataComponentTypeBuilder<T> persistent(Codec<T> codec) {
+		this.builder.persistent(codec);
+		return this;
+	}
+
+	public DataComponentTypeBuilder<T> networkSynchronized(StreamCodec<? super RegistryFriendlyByteBuf, T> streamCodec) {
+		this.builder.networkSynchronized(streamCodec);
+		return this;
+	}
+
+	public DataComponentTypeBuilder<T> cacheEncoding() {
+		this.builder.cacheEncoding();
+		return this;
+	}
+
+	@Override
+	DataComponentType<T> build() {
+		return builder.build();
+	}
+
+	@Override
+	DataComponentTypeHolder<T> getHolder(HolderOwner<DataComponentType<?>> owner, ResourceKey<DataComponentType<?>> key) {
+		//noinspection rawtypes,unchecked
+		return new DataComponentTypeHolder<T>((HolderOwner) owner, (ResourceKey) key);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/builder/ItemBuilder.java

@@ -0,0 +1,39 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.builder;
+
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.ItemHolder;
+import net.minecraft.core.HolderOwner;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.Item.Properties;
+
+import java.util.function.Function;
+
+public class ItemBuilder<T extends Item> extends AbstractBuilder<Item, T, ItemHolder<T>> {
+	private final Function<Properties, T> factory;
+	private Function<Properties, Properties> properties = Function.identity();
+
+	public ItemBuilder(CatnipRegistry owner, String name, Function<Properties, T> factory) {
+		super(owner, name, BuiltInRegistries.ITEM);
+		this.factory = factory;
+	}
+
+	public ItemBuilder<T> properties(Function<Properties, Properties> properties) {
+		this.properties = this.properties.andThen(properties);
+		return this;
+	}
+
+	@Override
+	T build() {
+		Properties properties = new Properties();
+		properties = this.properties.apply(properties);
+		return factory.apply(properties);
+	}
+
+	@Override
+	ItemHolder<T> getHolder(HolderOwner<Item> owner, ResourceKey<Item> key) {
+		//noinspection unchecked
+		return (ItemHolder<T>) new ItemHolder<>(owner, key);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/builder/package-info.java

@@ -0,0 +1,5 @@
+@net.minecraft.FieldsAreNonnullByDefault
+@javax.annotation.ParametersAreNonnullByDefault
+@net.minecraft.MethodsReturnNonnullByDefault
+package io.github.slimeistdev.crystalline_sky.foundation.registration.builder;
+// Copied from IThundxr's 1.21.1/registration branch of https://github.com/Creators-of-Create/Ponder/

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/BaseHolder.java

@@ -0,0 +1,39 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+
+import io.github.slimeistdev.crystalline_sky.foundation.registration.RegistrationListeners;
+import net.minecraft.core.Holder;
+import net.minecraft.core.HolderOwner;
+import net.minecraft.resources.ResourceKey;
+import org.jetbrains.annotations.ApiStatus;
+
+import java.util.function.Consumer;
+
+public class BaseHolder<T> extends Holder.Reference<T> {
+	private final RegistrationListeners<T> registrationListeners = new RegistrationListeners<>();
+
+	protected BaseHolder(HolderOwner<T> owner, ResourceKey<T> key) {
+		super(Type.STAND_ALONE, owner, key, null);
+	}
+
+	public <V> boolean is(V value) {
+		return value() == value;
+	}
+
+	@ApiStatus.Internal
+	public Consumer<T> getInternalRegistrationListener() {
+		return registrationListeners::registered;
+	}
+
+	public void onRegistered(Consumer<? super T> consumer) {
+		registrationListeners.addListener(consumer);
+	}
+
+	public static <T> Holder<T> downcast(Holder<? extends T> holder) {
+		//noinspection unchecked
+		return (Holder<T>) holder;
+	}
+
+	public String getRegisteredNamePath() {
+		return this.unwrapKey().map((resourceKey) -> resourceKey.location().getPath()).orElse("[unregistered]");
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/BlockHolder.java

@@ -0,0 +1,20 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+
+import net.minecraft.core.HolderOwner;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.BlockState;
+
+public class BlockHolder<T extends Block> extends ItemLikeHolder.NonItem<T> {
+	public BlockHolder(HolderOwner<T> owner, ResourceKey<T> key) {
+		super(owner, key);
+	}
+
+	public BlockState defaultBlockState() {
+		return value().defaultBlockState();
+	}
+
+	public boolean is(BlockState state) {
+		return is(state.getBlock());
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/DataComponentTypeHolder.java

@@ -0,0 +1,11 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+
+import net.minecraft.core.HolderOwner;
+import net.minecraft.core.component.DataComponentType;
+import net.minecraft.resources.ResourceKey;
+
+public class DataComponentTypeHolder<T> extends BaseHolder<DataComponentType<T>> {
+	public DataComponentTypeHolder(HolderOwner<DataComponentType<T>> owner, ResourceKey<DataComponentType<T>> key) {
+		super(owner, key);
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/ItemHolder.java

@@ -0,0 +1,16 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+
+import net.minecraft.core.HolderOwner;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.item.Item;
+
+public class ItemHolder<T extends Item> extends ItemLikeHolder<T> {
+	public ItemHolder(HolderOwner<T> owner, ResourceKey<T> key) {
+		super(owner, key);
+	}
+
+	@Override
+	public boolean is(Item item) {
+		return asItem() == item;
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/ItemLikeHolder.java

@@ -0,0 +1,43 @@
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+
+import net.minecraft.core.HolderOwner;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.ItemLike;
+
+abstract class ItemLikeHolder<T extends ItemLike> extends BaseHolder<T> implements ItemLike {
+	protected ItemLikeHolder(HolderOwner<T> owner, ResourceKey<T> key) {
+		super(owner, key);
+	}
+
+	public ItemStack asStack() {
+		return new ItemStack(this);
+	}
+
+	public ItemStack asStack(int count) {
+		return new ItemStack(this, count);
+	}
+
+	public boolean is(ItemStack stack) {
+		return is(stack.getItem());
+	}
+
+	public abstract boolean is(Item item);
+
+	@Override
+	public Item asItem() {
+		return value().asItem();
+	}
+
+	static class NonItem<T extends ItemLike> extends ItemLikeHolder<T> {
+		protected NonItem(HolderOwner<T> owner, ResourceKey<T> key) {
+			super(owner, key);
+		}
+
+		@Override
+		public boolean is(Item item) {
+			return asItem() == item;
+		}
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/holder/package-info.java

@@ -0,0 +1,5 @@
+@net.minecraft.FieldsAreNonnullByDefault
+@javax.annotation.ParametersAreNonnullByDefault
+@net.minecraft.MethodsReturnNonnullByDefault
+package io.github.slimeistdev.crystalline_sky.foundation.registration.holder;
+// Copied from IThundxr's 1.21.1/registration branch of https://github.com/Creators-of-Create/Ponder/

common/src/main/java/io/github/slimeistdev/crystalline_sky/foundation/registration/package-info.java

@@ -0,0 +1,5 @@
+@net.minecraft.FieldsAreNonnullByDefault
+@javax.annotation.ParametersAreNonnullByDefault
+@net.minecraft.MethodsReturnNonnullByDefault
+package io.github.slimeistdev.crystalline_sky.foundation.registration;
+// Copied from IThundxr's 1.21.1/registration branch of https://github.com/Creators-of-Create/Ponder/

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/Holder$ReferenceAccessor.java

@@ -0,0 +1,16 @@
+package io.github.slimeistdev.crystalline_sky.mixin;
+
+import net.minecraft.core.Holder;
+import net.minecraft.core.HolderOwner;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+@Mixin(Holder.Reference.class)
+public interface Holder$ReferenceAccessor<T> {
+	@Accessor("owner")
+	HolderOwner<T> crystalline_sky$getOwner();
+
+	@Invoker("bindValue")
+	void crystalline_sky$bindValue(T value);
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/ClientLevelMixin.java

@@ -24,9 +24,9 @@ public class ClientLevelMixin {
 	@Inject(method = "<clinit>", at = @At("RETURN"))
 	private static void modifyBlockMarkerItems(CallbackInfo ci) {
 		MARKER_PARTICLE_ITEMS = new HashSet<>(MARKER_PARTICLE_ITEMS);
-		MARKER_PARTICLE_ITEMS.add(CrystallineItems.SKY_LIGHT);
+		MARKER_PARTICLE_ITEMS.add(CrystallineItems.SKY_LIGHT.value());
-		MARKER_PARTICLE_ITEMS.add(CrystallineItems.WEEPING_SKY_LIGHT);
+		MARKER_PARTICLE_ITEMS.add(CrystallineItems.WEEPING_SKY_LIGHT.value());
-		MARKER_PARTICLE_ITEMS.add(CrystallineItems.SKY);
+		MARKER_PARTICLE_ITEMS.add(CrystallineItems.SKY.value());
-		MARKER_PARTICLE_ITEMS.add(CrystallineItems.WEEPING_SKY);
+		MARKER_PARTICLE_ITEMS.add(CrystallineItems.WEEPING_SKY.value());
 	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/LevelRenderer_NoSodium_Mixin.java

@@ -39,10 +39,8 @@ public class LevelRenderer_NoSodium_Mixin {
 		if (renderLayer == CrystallineRenderTypes.SKY
 			&& instance.COLOR_MODULATOR != null
 			&& minecraft.player != null
-			&& (minecraft.player.getMainHandItem().is(CrystallineItems.SKY)
+			&& (CrystallineItems.isSky(minecraft.player.getMainHandItem())
-			|| minecraft.player.getOffhandItem().is(CrystallineItems.SKY)
+			|| CrystallineItems.isSky(minecraft.player.getOffhandItem()))) {
-			|| minecraft.player.getMainHandItem().is(CrystallineItems.WEEPING_SKY)
-			|| minecraft.player.getOffhandItem().is(CrystallineItems.WEEPING_SKY))) {
 
 			float f = ticks + minecraft.getTimer().getGameTimeDeltaPartialTick(true);
 			float alpha = (Mth.sin(f / 10.0f) + 1.0f) / 2.0f;

common/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/ItemGroupRegistrationEvent.java

@@ -0,0 +1,14 @@
+package io.github.slimeistdev.crystalline_sky.multiloader;
+
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.item.CreativeModeTab;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.ItemLike;
+
+import java.util.List;
+
+public interface ItemGroupRegistrationEvent {
+	ResourceKey<CreativeModeTab> getTab();
+	boolean hasPermissions();
+	void addAfter(ItemLike reference, List<ItemStack> stacks);
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/Loader.java

@@ -0,0 +1,60 @@
+/*
+ * Steam 'n' Rails
+ * Copyright (c) 2022-2024 The Railways Team
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 io.github.slimeistdev.crystalline_sky.multiloader;
+
+import dev.architectury.injectables.annotations.ExpectPlatform;
+import io.github.slimeistdev.crystalline_sky.compat.Mods;
+import io.github.slimeistdev.crystalline_sky.util.TextUtils;
+import org.jetbrains.annotations.ApiStatus.Internal;
+
+import java.util.Locale;
+import java.util.function.Supplier;
+
+public enum Loader {
+	NEOFORGE, FABRIC, QUILT;
+
+	public static final Loader CURRENT = getCurrent();
+
+	public boolean isCurrent() {
+		return this == CURRENT;
+	}
+
+	public void runIfCurrent(Supplier<Runnable> run) {
+		if (isCurrent())
+			run.get().run();
+	}
+	
+	public static String getFormatted() {
+		return TextUtils.titleCaseConversion(getActual().name().toLowerCase(Locale.ROOT));
+	}
+
+	// Returns the actual loader, ex: quilt on quilt instead of fabric for quilt
+	public static Loader getActual() {
+		//noinspection ConstantValue
+		if (FABRIC.isCurrent() && Mods.isModLoaded("quilt_loader"))
+			return QUILT;
+		return CURRENT;
+	}
+
+	@Internal
+	@ExpectPlatform
+	private static Loader getCurrent() {
+		throw new AssertionError();
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/registry/CrystallineBlocks.java

@@ -1,76 +1,63 @@
 package io.github.slimeistdev.crystalline_sky.registry;
 
 import io.github.slimeistdev.crystalline_sky.CrystallineSky;
+import io.github.slimeistdev.crystalline_sky.content.blocks.SkyBlock;
 import io.github.slimeistdev.crystalline_sky.content.blocks.SkyLightBlock;
 import io.github.slimeistdev.crystalline_sky.content.blocks.WeepingSkyLightBlock;
-import net.minecraft.world.level.block.Block;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
-import net.minecraft.world.level.block.Blocks;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BlockHolder;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.BlockGetter;
 import net.minecraft.world.level.block.LightBlock;
-import net.minecraft.world.level.block.TransparentBlock;
-import net.minecraft.world.level.block.state.BlockBehaviour;
-import net.minecraft.world.level.block.state.BlockBehaviour.Properties;
-import net.minecraft.core.registries.BuiltInRegistries;
-import net.minecraft.core.Registry;
-import net.minecraft.resources.ResourceKey;
-import net.minecraft.core.registries.Registries;
 import net.minecraft.world.level.block.SoundType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.state.properties.BlockStateProperties;
 import net.minecraft.world.level.material.MapColor;
 
-import java.util.function.Function;
-
 @SuppressWarnings("SameParameterValue")
 public class CrystallineBlocks {
-	public static final Block SKY = register("sky", TransparentBlock::new, Properties.of()
+	private static final CatnipRegistry REGISTRY = CrystallineSky.registry();
+
+	public static final BlockHolder<SkyBlock> SKY = REGISTRY.block("sky", SkyBlock::new)
+		.properties(p -> p
 			.strength(0.3f)
 			.sound(SoundType.AMETHYST)
 			.noOcclusion()
-		.isValidSpawn(Blocks::never)
+			.isValidSpawn(CrystallineBlocks::never)
-		.isRedstoneConductor(Blocks::never)
+			.isRedstoneConductor(CrystallineBlocks::never)
-		.isSuffocating(Blocks::never)
+			.isSuffocating(CrystallineBlocks::never)
-		.isViewBlocking(Blocks::never)
+			.isViewBlocking(CrystallineBlocks::never)
-		.emissiveRendering(Blocks::always));
+			.emissiveRendering(CrystallineBlocks::always))
+		.register();
 
-	public static final Block WEEPING_SKY = register("weeping_sky", TransparentBlock::new, Properties.ofFullCopy(SKY));
+	public static final BlockHolder<SkyBlock> WEEPING_SKY = REGISTRY.block("weeping_sky", SkyBlock::new)
+		.initialProperties(SKY::value)
+		.register();
 
-	public static final Block SKY_LIGHT = register(
+	public static final BlockHolder<SkyLightBlock> SKY_LIGHT = REGISTRY.block("sky_light", SkyLightBlock::new)
-		"sky_light",
+		.properties(p -> p
-		SkyLightBlock::new,
-		BlockBehaviour.Properties.of()
 			.replaceable()
 			.strength(-1.0F, 3600000.8F)
-			.mapColor(state -> state.getValue(BlockStateProperties.WATERLOGGED) ? MapColor.WATER : MapColor.NONE)
+			.mapColor(CrystallineBlocks::waterloggedColor)
 			.noLootTable()
-			.noOcclusion()
+			.noOcclusion())
-	);
+		.register();
 
-	public static final Block WEEPING_SKY_LIGHT = register(
+	public static final BlockHolder<WeepingSkyLightBlock> WEEPING_SKY_LIGHT = REGISTRY.block("weeping_sky_light", WeepingSkyLightBlock::new)
-		"weeping_sky_light",
+		.initialProperties(SKY_LIGHT::value)
-		WeepingSkyLightBlock::new,
+		.register();
-		BlockBehaviour.Properties.of()
-			.replaceable()
-			.strength(-1.0F, 3600000.8F)
-			.mapColor(state -> state.getValue(BlockStateProperties.WATERLOGGED) ? MapColor.WATER : MapColor.NONE)
-			.noLootTable()
-			.noOcclusion()
-	);
 
 	public static void init() {}
 
-	private static <T extends Block> T register(String id, Function<Properties, T> factory, Properties settings) {
-		ResourceKey<Block> key = CrystallineSky.key(Registries.BLOCK, id);
-		return Registry.register(BuiltInRegistries.BLOCK, key, factory.apply(settings));
-	}
-
 	public static boolean isCrystallineSky(BlockState state) {
 		return getSkyLightLevel(state) > 0;
 	}
 
 	public static int getSkyLightLevel(BlockState state) {
-		if (state.is(SKY_LIGHT)) {
+		if (SKY_LIGHT.is(state)) {
 			return state.getValue(LightBlock.LEVEL);
-		} else if (state.is(SKY)) { // weeping sky explicitly excluded, that's handled differently
+		} else if (SKY.is(state)) { // weeping sky explicitly excluded, that's handled differently
 			return 15;
 		}
 
@@ -78,6 +65,26 @@ public class CrystallineBlocks {
 	}
 
 	public static boolean isWeepingSky(BlockState state) {
-		return state.is(WEEPING_SKY) || state.is(WEEPING_SKY_LIGHT);
+		return WEEPING_SKY.is(state) || WEEPING_SKY_LIGHT.is(state);
+	}
+
+	private static Boolean never(BlockState state, BlockGetter blockGetter, BlockPos pos, EntityType<?> entity) {
+		return false;
+	}
+
+	private static Boolean always(BlockState state, BlockGetter blockGetter, BlockPos pos, EntityType<?> entity) {
+		return true;
+	}
+
+	private static boolean always(BlockState state, BlockGetter blockGetter, BlockPos pos) {
+		return true;
+	}
+
+	private static boolean never(BlockState state, BlockGetter blockGetter, BlockPos pos) {
+		return false;
+	}
+
+	private static MapColor waterloggedColor(BlockState state) {
+		return state.getValue(BlockStateProperties.WATERLOGGED) ? MapColor.WATER : MapColor.NONE;
 	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/registry/CrystallineDataComponentTypes.java

@@ -1,26 +1,19 @@
 package io.github.slimeistdev.crystalline_sky.registry;
 
 import io.github.slimeistdev.crystalline_sky.CrystallineSky;
-import net.minecraft.core.component.DataComponentType;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.DataComponentTypeHolder;
 import net.minecraft.network.codec.StreamCodec;
-import net.minecraft.core.registries.BuiltInRegistries;
-import net.minecraft.core.Registry;
 import net.minecraft.util.Unit;
 
-import java.util.function.UnaryOperator;
-
 public class CrystallineDataComponentTypes {
-	public static final DataComponentType<Unit> WEEPING_SKY_DEBUG_COLUMN_TOOL = register(
+	private static final CatnipRegistry REGISTRY = CrystallineSky.registry();
-		"weeping_sky_debug_column_tool",
+
-		b -> b
+	public static final DataComponentTypeHolder<Unit> WEEPING_SKY_DEBUG_COLUMN_TOOL =
+		REGISTRY.<Unit>dataComponentType("weeping_sky_debug_column_tool")
 			.networkSynchronized(StreamCodec.unit(Unit.INSTANCE))
 			.persistent(Unit.CODEC)
-	);
+			.register();
-
-	@SuppressWarnings("SameParameterValue")
-	private static <T> DataComponentType<T> register(String id, UnaryOperator<DataComponentType.Builder<T>> builderOperator) {
-		return Registry.register(BuiltInRegistries.DATA_COMPONENT_TYPE, CrystallineSky.id(id), builderOperator.apply(DataComponentType.builder()).build());
-	}
 
 	public static void init() {}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/registry/CrystallineItems.java

@@ -1,54 +1,54 @@
 package io.github.slimeistdev.crystalline_sky.registry;
 
+import io.github.slimeistdev.crystalline_sky.CrystallineSky;
 import io.github.slimeistdev.crystalline_sky.content.blocks.SkyLightBlock;
 import io.github.slimeistdev.crystalline_sky.content.items.WeepingSkyBlockItem;
-import net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.CatnipRegistry;
-import net.minecraft.world.level.block.Block;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.ItemHolder;
-import net.minecraft.world.level.block.LightBlock;
+import io.github.slimeistdev.crystalline_sky.multiloader.ItemGroupRegistrationEvent;
 import net.minecraft.core.component.DataComponents;
-import net.minecraft.world.item.component.BlockItemStateProperties;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.BlockItem;
-import net.minecraft.world.item.Item;
+import net.minecraft.world.item.CreativeModeTab;
-import net.minecraft.world.item.CreativeModeTabs;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.Items;
 import net.minecraft.world.item.Rarity;
+import net.minecraft.world.item.component.BlockItemStateProperties;
+import net.minecraft.world.level.block.LightBlock;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.function.BiFunction;
 
 public class CrystallineItems {
-	public static final Item SKY = Items.registerBlock(
+	private static final CatnipRegistry REGISTRY = CrystallineSky.registry();
-		CrystallineBlocks.SKY,
-		settings -> settings.rarity(Rarity.EPIC)
-	);
 
-	public static final Item WEEPING_SKY = register(
+	public static final ItemHolder<BlockItem> SKY = REGISTRY.item(CrystallineBlocks.SKY)
-		CrystallineBlocks.WEEPING_SKY,
+		.properties(p -> p.rarity(Rarity.EPIC))
-		(block, settings) -> new WeepingSkyBlockItem(block, settings.rarity(Rarity.EPIC))
+		.register();
-	);
 
-	public static final Item SKY_LIGHT = Items.registerBlock(
+	public static final ItemHolder<WeepingSkyBlockItem> WEEPING_SKY = REGISTRY.item(CrystallineBlocks.WEEPING_SKY, WeepingSkyBlockItem::new)
-		CrystallineBlocks.SKY_LIGHT,
+		.properties(p -> p.rarity(Rarity.EPIC))
-		settings -> settings.rarity(Rarity.EPIC)
+		.register();
-			.component(DataComponents.BLOCK_STATE, BlockItemStateProperties.EMPTY.with(LightBlock.LEVEL, 15))
-	);
 
-	public static final Item WEEPING_SKY_LIGHT = Items.registerBlock(
+	public static final ItemHolder<BlockItem> SKY_LIGHT = REGISTRY.item(CrystallineBlocks.SKY_LIGHT)
-		CrystallineBlocks.WEEPING_SKY_LIGHT,
+		.properties(p -> p
-		settings -> settings.rarity(Rarity.EPIC)
+			.rarity(Rarity.EPIC)
-	);
+			.component(DataComponents.BLOCK_STATE, BlockItemStateProperties.EMPTY.with(LightBlock.LEVEL, 15)))
+		.register();
+
+	public static final ItemHolder<BlockItem> WEEPING_SKY_LIGHT = REGISTRY.item(CrystallineBlocks.WEEPING_SKY_LIGHT)
+		.properties(p -> p.rarity(Rarity.EPIC))
+		.register();
 
 	@SuppressWarnings("SameParameterValue")
-	private static Item register(Block block, BiFunction<Block, Item.Properties, BlockItem> factory) {
+	private static ResourceKey<CreativeModeTab> tabKey(String name) {
-		return Items.registerBlock(factory.apply(block, new Item.Properties()));
+		return ResourceKey.create(Registries.CREATIVE_MODE_TAB, ResourceLocation.withDefaultNamespace(name));
 	}
 
-	public static void init() {
+	public static void onItemGroupRegistration(ItemGroupRegistrationEvent event) {
-		ItemGroupEvents.modifyEntriesEvent(CreativeModeTabs.OP_BLOCKS).register(entries -> {
+		if (event.getTab().equals(tabKey("op_blocks")) && event.hasPermissions()) {
-			if (!entries.getContext().hasPermissions()) return;
-
 			List<ItemStack> stacks = new ArrayList<>();
 
 			stacks.add(new ItemStack(SKY));
@@ -60,7 +60,13 @@ public class CrystallineItems {
 
 			stacks.add(new ItemStack(WEEPING_SKY_LIGHT));
 
-			entries.addAfter(Items.LIGHT, stacks);
+			event.addAfter(Items.LIGHT, stacks);
-		});
+		}
+	}
+
+	public static void init() {}
+
+	public static boolean isSky(ItemStack stack) {
+		return SKY.is(stack) || WEEPING_SKY.is(stack);
 	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/registry/client/CrystallineRenderTypes.java

@@ -1,21 +1,18 @@
 package io.github.slimeistdev.crystalline_sky.registry.client;
 
 import com.mojang.blaze3d.systems.RenderSystem;
-import io.github.slimeistdev.crystalline_sky.mixin_ducks.client.RenderType_Duck;
+import com.mojang.blaze3d.vertex.DefaultVertexFormat;
+import com.mojang.blaze3d.vertex.VertexFormat;
 import io.github.slimeistdev.crystalline_sky.mixin_ducks.client.LevelRenderer_Duck;
+import io.github.slimeistdev.crystalline_sky.mixin_ducks.client.RenderType_Duck;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.Minecraft;
-import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.RenderStateShard;
-import com.mojang.blaze3d.vertex.VertexFormat;
+import net.minecraft.client.renderer.RenderType;
-import com.mojang.blaze3d.vertex.DefaultVertexFormat;
-
-import static net.minecraft.client.renderer.RenderType.create;
-import static net.minecraft.client.renderer.RenderStateShard.LIGHTMAP;
 
 @Environment(EnvType.CLIENT)
-public class CrystallineRenderTypes {
+public abstract class CrystallineRenderTypes extends RenderType {
 	private static final RenderStateShard.EmptyTextureStateShard SKY_TEXTURE = new SkyBufferTexture();
 	private static final RenderStateShard.ShaderStateShard SKY_PROGRAM = new RenderStateShard.ShaderStateShard(CrystallineShaderInstances::getRenderTypeSkyProgram);
 
@@ -38,6 +35,10 @@ public class CrystallineRenderTypes {
 		((RenderType_Duck) SKY).crystalline_sky$markAsBlockLayer();
 	}
 
+	private CrystallineRenderTypes(String name, VertexFormat format, VertexFormat.Mode mode, int bufferSize, boolean affectsCrumbling, boolean sortOnUpload, Runnable setupState, Runnable clearState) {
+		super(name, format, mode, bufferSize, affectsCrumbling, sortOnUpload, setupState, clearState);
+	}
+
 	private static class SkyBufferTexture extends RenderStateShard.EmptyTextureStateShard {
 		public SkyBufferTexture() {
 			super(() -> {

common/src/main/java/io/github/slimeistdev/crystalline_sky/util/TextUtils.java

@@ -0,0 +1,107 @@
+/*
+ * Steam 'n' Rails
+ * Copyright (c) 2022-2026 The Railways Team
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 io.github.slimeistdev.crystalline_sky.util;
+
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.MutableComponent;
+import net.minecraft.network.chat.Style;
+import org.apache.commons.lang3.StringUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Locale;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+public class TextUtils {
+    public static String snakeCaseToTitleCase(String inputString) {
+        return titleCaseConversion(inputString.replace("_", " "));
+    }
+
+    public static String titleCaseConversion(String inputString) {
+        if (StringUtils.isBlank(inputString)) {
+            return "";
+        }
+
+        if (StringUtils.length(inputString) == 1) {
+            return inputString.toUpperCase(Locale.ROOT);
+        }
+
+        StringBuffer resultPlaceHolder = new StringBuffer(inputString.length());
+
+        Stream.of(inputString.split(" ")).forEach(stringPart -> {
+            if (stringPart.length() > 1)
+                resultPlaceHolder.append(stringPart.substring(0, 1)
+                        .toUpperCase(Locale.ROOT))
+                    .append(stringPart.substring(1)
+                        .toLowerCase(Locale.ROOT));
+            else
+                resultPlaceHolder.append(stringPart.toUpperCase(Locale.ROOT));
+
+            resultPlaceHolder.append(" ");
+        });
+        return StringUtils.trim(resultPlaceHolder.toString());
+    }
+
+    public static Component translateWithFormatting(String key, Object... args) {
+        MutableComponent base = Component.translatable(key, args);
+        StringBuilder partsStringBuilder = new StringBuilder();
+        base.visit((style, part) -> {
+            partsStringBuilder.append(part);
+            return Optional.empty();
+        }, Style.EMPTY);
+        return Component.literal(partsStringBuilder.toString());
+    }
+
+    public static String joinSpace(@Nullable String... strings) {
+        return join(" ", strings);
+    }
+
+    public static String joinUnderscore(@Nullable String... strings) {
+        return join("_", strings);
+    }
+
+    public static String join(final String separator, final @Nullable String... strings) {
+        String[] filtered = Stream.of(strings).filter(s -> s != null && !s.isEmpty()).toArray(String[]::new);
+        StringBuilder out = new StringBuilder();
+        for (int i = 0; i < filtered.length; i++) {
+            out.append(filtered[i]);
+            if (i < filtered.length - 1) out.append(separator);
+        }
+        return out.toString();
+    }
+
+    public static String stripPrefix(String string, String prefix) {
+        if (string.startsWith(prefix)) {
+            return string.substring(prefix.length());
+        }
+        return string;
+    }
+
+    public static String ensureEndsWith(String string, String suffix) {
+        if (!string.endsWith(suffix)) {
+            return string + suffix;
+        }
+        return string;
+    }
+
+    public static String prefixToFolder(String name, @NotNull String prefix) {
+        return prefix + "/" + stripPrefix(name, ensureEndsWith(prefix, "_"));
+    }
+}

common/src/main/resources/crystalline_sky-common.mixins.json

@@ -8,20 +8,20 @@
   "plugin": "io.github.slimeistdev.crystalline_sky.mixin.CrystallineSkyMixinPlugin",
   "compatibilityLevel": "JAVA_21",
   "mixins": [
-    "LightEngineMixin",
     "ChunkSkyLightSourcesMixin",
-    "SkyLightEngineMixin",
+    "Holder$ReferenceAccessor",
     "LayerLightSectionStorageAccessor",
+    "LightEngineMixin",
+    "SkyLightEngineMixin",
     "SkyLightSectionStorageAccessor"
   ],
   "client": [
     "client.ClientLevelMixin",
     "client.DebugRendererMixin",
-    "client.RenderTargetMixin",
     "client.GameRendererMixin",
     "client.LevelRenderer_NoSodium_Mixin",
     "client.LevelRendererMixin",
-    "client.compat.axiom.ChunkRenderOverrider_AxiomChunkOverrideLayerMixin",
+    "client.RenderTargetMixin",
     "client.compat.sodium.DefaultMaterialsMixin",
     "client.compat.sodium.DefaultTerrainRenderPassesMixin",
     "client.compat.sodium.ShaderChunkRendererMixin",

fabric/build.gradle.kts

@@ -10,9 +10,9 @@ loom {
 			client()
 
 			name = "Minecraft Data"
-			vmArg("-Dfabric-api.data")
+			vmArg("-Dfabric-api.datagen")
 			vmArg("-Dfabric-api.datagen.output-dir=${common.file("src/generated/resources")}")
-			vmArg("-Dfabric-api.datagen.modid=${"slug"()}")
+			vmArg("-Dfabric-api.datagen.modid=${"modId"()}")
 
 			environmentVariable("DATAGEN", "TRUE")
 		}

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/compat/fabric/ModsImpl.java

@@ -0,0 +1,11 @@
+package io.github.slimeistdev.crystalline_sky.compat.fabric;
+
+import io.github.slimeistdev.crystalline_sky.annotation.multiloader.ImplClass;
+import net.fabricmc.loader.api.FabricLoader;
+
+@ImplClass
+public class ModsImpl {
+	public static boolean isModLoaded(String id) {
+		return FabricLoader.getInstance().isModLoaded(id);
+	}
+}

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/fabric/CrystallineSkyClientImpl.java

@@ -1,6 +1,7 @@
 package io.github.slimeistdev.crystalline_sky.fabric;
 
 import io.github.slimeistdev.crystalline_sky.CrystallineSkyClient;
+import io.github.slimeistdev.crystalline_sky.multiloader.fabric.ItemGroupRegistrationEventImpl;
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineBlocks;
 import io.github.slimeistdev.crystalline_sky.registry.client.CrystallineRenderTypes;
 import net.fabricmc.api.ClientModInitializer;
@@ -9,6 +10,9 @@ import net.fabricmc.api.Environment;
 import net.fabricmc.fabric.api.blockrenderlayer.v1.BlockRenderLayerMap;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
 import net.fabricmc.fabric.api.client.keybinding.v1.KeyBindingHelper;
+import net.minecraft.world.level.block.Block;
+
+import java.util.function.Consumer;
 
 @Environment(EnvType.CLIENT)
 public class CrystallineSkyClientImpl implements ClientModInitializer {
@@ -16,9 +20,11 @@ public class CrystallineSkyClientImpl implements ClientModInitializer {
 	public void onInitializeClient() {
 		CrystallineSkyClient.init();
 		CrystallineSkyClient.registerKeybindings(KeyBindingHelper::registerKeyBinding);
+		ItemGroupRegistrationEventImpl.register();
 
-		BlockRenderLayerMap.INSTANCE.putBlock(CrystallineBlocks.SKY, CrystallineRenderTypes.SKY);
+		Consumer<Block> makeSky = b -> BlockRenderLayerMap.INSTANCE.putBlock(b, CrystallineRenderTypes.SKY);
-		BlockRenderLayerMap.INSTANCE.putBlock(CrystallineBlocks.WEEPING_SKY, CrystallineRenderTypes.SKY);
+		CrystallineBlocks.SKY.onRegistered(makeSky);
+		CrystallineBlocks.WEEPING_SKY.onRegistered(makeSky);
 
 		ClientTickEvents.END_CLIENT_TICK.register(CrystallineSkyClient::onEndTick);
 	}

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/fabric/datagen/providers/CrystallineSkyBlockTagProvider.java

@@ -1,13 +1,16 @@
 package io.github.slimeistdev.crystalline_sky.fabric.datagen.providers;
 
 import io.github.slimeistdev.crystalline_sky.CrystallineSky;
+import io.github.slimeistdev.crystalline_sky.foundation.registration.holder.BaseHolder;
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineBlocks;
 import net.fabricmc.fabric.api.datagen.v1.FabricDataOutput;
 import net.fabricmc.fabric.api.datagen.v1.provider.FabricTagProvider;
-import net.minecraft.core.registries.Registries;
+import net.minecraft.core.Holder;
 import net.minecraft.core.HolderLookup;
+import net.minecraft.core.registries.Registries;
 import net.minecraft.tags.BlockTags;
 import net.minecraft.tags.TagKey;
+import net.minecraft.world.level.block.Block;
 
 import java.util.concurrent.CompletableFuture;
 
@@ -18,14 +21,25 @@ public class CrystallineSkyBlockTagProvider extends FabricTagProvider.BlockTagPr
 
 	@Override
 	protected void addTags(HolderLookup.Provider wrapperLookup) {
-		getOrCreateTagBuilder(TagKey.create(Registries.BLOCK, CrystallineSky.id("sky_light_emitters")))
+		builder(TagKey.create(Registries.BLOCK, CrystallineSky.id("sky_light_emitters")))
 			.add(CrystallineBlocks.SKY)
 			.add(CrystallineBlocks.SKY_LIGHT)
 			.add(CrystallineBlocks.WEEPING_SKY)
 			.add(CrystallineBlocks.WEEPING_SKY_LIGHT);
 
-		getOrCreateTagBuilder(BlockTags.CRYSTAL_SOUND_BLOCKS)
+		builder(BlockTags.CRYSTAL_SOUND_BLOCKS)
 			.add(CrystallineBlocks.SKY)
 			.add(CrystallineBlocks.WEEPING_SKY);
 	}
+
+	private TagBuilder<Block> builder(TagKey<Block> tag) {
+		return new TagBuilder<>(getOrCreateTagBuilder(tag));
+	}
+
+	private record TagBuilder<T>(FabricTagProvider<T>.FabricTagBuilder wrapped) {
+		public <R extends T> TagBuilder<T> add(Holder<R> object) {
+			BaseHolder.<T>downcast(object).unwrap().map(wrapped::add, wrapped::add);
+			return this;
+		}
+	}
 }

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/fabric/datagen/providers/CrystallineSkyLootProvider.java

@@ -14,7 +14,7 @@ public class CrystallineSkyLootProvider extends FabricBlockLootTableProvider {
 
 	@Override
 	public void generate() {
-		dropWhenSilkTouch(CrystallineBlocks.SKY);
+		dropWhenSilkTouch(CrystallineBlocks.SKY.value());
-		dropWhenSilkTouch(CrystallineBlocks.WEEPING_SKY);
+		dropWhenSilkTouch(CrystallineBlocks.WEEPING_SKY.value());
 	}
 }

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/fabric/datagen/providers/CrystallineSkyModelProvider.java

@@ -32,12 +32,12 @@ public class CrystallineSkyModelProvider extends FabricModelProvider {
 
 	@Override
 	public void generateBlockStateModels(BlockModelGenerators gen) {
-		registerSkyBlock(gen, CrystallineBlocks.SKY);
+		registerSkyBlock(gen, CrystallineBlocks.SKY.value());
-		registerSkyBlock(gen, CrystallineBlocks.WEEPING_SKY);
+		registerSkyBlock(gen, CrystallineBlocks.WEEPING_SKY.value());
-		registerSkyLightBlock(gen, CrystallineBlocks.SKY_LIGHT, CrystallineItems.SKY_LIGHT);
+		registerSkyLightBlock(gen, CrystallineBlocks.SKY_LIGHT.value(), CrystallineItems.SKY_LIGHT.value());
 
-		gen.createAirLikeBlock(CrystallineBlocks.WEEPING_SKY_LIGHT, CrystallineItems.WEEPING_SKY_LIGHT);
+		gen.createAirLikeBlock(CrystallineBlocks.WEEPING_SKY_LIGHT.value(), CrystallineItems.WEEPING_SKY_LIGHT.value());
-		gen.createSimpleFlatItemModel(CrystallineItems.WEEPING_SKY_LIGHT);
+		gen.createSimpleFlatItemModel(CrystallineItems.WEEPING_SKY_LIGHT.value());
 	}
 
 	private void registerSkyBlock(BlockModelGenerators gen, Block block) {

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/fabric/mixin/client/compat/axiom/ChunkRenderOverrider_AxiomChunkOverrideLayerMixin.java

@@ -1,4 +1,4 @@
-package io.github.slimeistdev.crystalline_sky.mixin.client.compat.axiom;
+package io.github.slimeistdev.crystalline_sky.fabric.mixin.client.compat.axiom;
 
 import com.moulberry.axiom.render.ChunkRenderOverrider;
 import io.github.slimeistdev.crystalline_sky.annotation.mixin.ConditionalMixin;

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/fabric/ItemGroupRegistrationEventImpl.java

@@ -0,0 +1,47 @@
+package io.github.slimeistdev.crystalline_sky.multiloader.fabric;
+
+import io.github.slimeistdev.crystalline_sky.multiloader.ItemGroupRegistrationEvent;
+import io.github.slimeistdev.crystalline_sky.registry.CrystallineItems;
+import net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroupEntries;
+import net.fabricmc.fabric.api.itemgroup.v1.ItemGroupEvents;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.item.CreativeModeTab;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.ItemLike;
+
+import java.util.List;
+
+public class ItemGroupRegistrationEventImpl implements ItemGroupRegistrationEvent {
+	private final ResourceKey<CreativeModeTab> tab;
+	private final FabricItemGroupEntries entries;
+
+	public ItemGroupRegistrationEventImpl(ResourceKey<CreativeModeTab> tab, FabricItemGroupEntries entries) {
+		this.tab = tab;
+		this.entries = entries;
+	}
+
+	@Override
+	public ResourceKey<CreativeModeTab> getTab() {
+		return tab;
+	}
+
+	@Override
+	public boolean hasPermissions() {
+		return entries.getContext().hasPermissions();
+	}
+
+	@Override
+	public void addAfter(ItemLike reference, List<ItemStack> stacks) {
+		entries.addAfter(reference, stacks);
+	}
+
+	public static void register() {
+		ItemGroupEvents.MODIFY_ENTRIES_ALL.register((tab, entries) -> {
+			CrystallineItems.onItemGroupRegistration(new ItemGroupRegistrationEventImpl(
+				BuiltInRegistries.CREATIVE_MODE_TAB.getResourceKey(tab).orElseThrow(),
+				entries
+			));
+		});
+	}
+}

fabric/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/fabric/LoaderImpl.java

@@ -0,0 +1,13 @@
+package io.github.slimeistdev.crystalline_sky.multiloader.fabric;
+
+import io.github.slimeistdev.crystalline_sky.annotation.multiloader.ImplClass;
+import io.github.slimeistdev.crystalline_sky.multiloader.Loader;
+import org.jetbrains.annotations.ApiStatus.Internal;
+
+@ImplClass
+public class LoaderImpl {
+	@Internal
+	public static Loader getCurrent() {
+		return Loader.FABRIC;
+	}
+}

fabric/src/main/resources/crystalline_sky.mixins.json

@@ -10,7 +10,8 @@
   "mixins": [
   ],
   "client": [
-    "client.RenderTypeMixin"
+    "client.RenderTypeMixin",
+    "client.compat.axiom.ChunkRenderOverrider_AxiomChunkOverrideLayerMixin"
   ],
   "server": [
   ],

libs.versions.toml

@@ -9,6 +9,7 @@ parchment = "2024.11.17"
 fl = "0.18.6"
 fapi = "0.116.10+1.21.1"
 nf = "21.1.215"
+jsr305 = "3.0.2"
 mixinextras = "0.5.0"
 mm = "11.0.4"
 sodium-fabric = "mc1.21.1-0.6.13-fabric"
@@ -34,6 +35,8 @@ fapi = { group = "net.fabricmc.fabric-api", name = "fabric-api", version.ref = "
 
 nf = { group = "net.neoforged", name = "neoforge", version.ref = "nf" }
 
+jsr305 = { group = "com.google.code.findbugs", name = "jsr305", version.ref = "jsr305" }
+
 mixinextras-common = { group = "io.github.llamalad7", name = "mixinextras-common", version.ref = "mixinextras" }
 mixinextras-fabric = { group = "io.github.llamalad7", name = "mixinextras-fabric", version.ref = "mixinextras" }
 mixinextras-neoforge = { group = "io.github.llamalad7", name = "mixinextras-neoforge", version.ref = "mixinextras" }

neoforge/src/main/java/io/github/slimeistdev/crystalline_sky/compat/neoforge/ModsImpl.java

@@ -0,0 +1,20 @@
+package io.github.slimeistdev.crystalline_sky.compat.neoforge;
+
+import io.github.slimeistdev.crystalline_sky.annotation.multiloader.ImplClass;
+import net.neoforged.fml.loading.LoadingModList;
+import net.neoforged.fml.loading.moddiscovery.ModInfo;
+
+import java.util.List;
+
+@ImplClass
+public class ModsImpl {
+	public static boolean isModLoaded(String id) {
+		List<ModInfo> mods = LoadingModList.get().getMods();
+		for (ModInfo mod : mods) {
+			if (mod.getModId().equals(id)) {
+				return true;
+			}
+		}
+		return false;
+	}
+}

neoforge/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/neoforge/ItemGroupRegistrationEventImpl.java

@@ -0,0 +1,6 @@
+package io.github.slimeistdev.crystalline_sky.multiloader.neoforge;
+
+public class ItemGroupRegistrationEventImpl {
+	public static void create() {
+	}
+}

neoforge/src/main/java/io/github/slimeistdev/crystalline_sky/multiloader/neoforge/LoaderImpl.java

@@ -0,0 +1,13 @@
+package io.github.slimeistdev.crystalline_sky.multiloader.neoforge;
+
+import io.github.slimeistdev.crystalline_sky.annotation.multiloader.ImplClass;
+import io.github.slimeistdev.crystalline_sky.multiloader.Loader;
+import org.jetbrains.annotations.ApiStatus.Internal;
+
+@ImplClass
+public class LoaderImpl {
+	@Internal
+	public static Loader getCurrent() {
+		return Loader.NEOFORGE;
+	}
+}

neoforge/src/main/java/io/github/slimeistdev/crystalline_sky/neoforge/CrystallineSkyClientImpl.java

@@ -5,12 +5,15 @@ import io.github.slimeistdev.crystalline_sky.CrystallineSkyClient;
 import io.github.slimeistdev.crystalline_sky.registry.client.CrystallineRenderTypes;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.RenderType;
+import net.minecraft.world.item.CreativeModeTab;
+import net.minecraft.world.item.CreativeModeTabs;
 import net.neoforged.api.distmarker.Dist;
 import net.neoforged.bus.api.SubscribeEvent;
 import net.neoforged.fml.common.EventBusSubscriber;
 import net.neoforged.neoforge.client.event.ClientTickEvent;
 import net.neoforged.neoforge.client.event.RegisterKeyMappingsEvent;
 import net.neoforged.neoforge.client.event.RegisterNamedRenderTypesEvent;
+import net.neoforged.neoforge.event.BuildCreativeModeTabContentsEvent;
 
 @EventBusSubscriber(value = Dist.CLIENT, modid = CrystallineSky.ID)
 public class CrystallineSkyClientImpl {
@@ -33,4 +36,9 @@ public class CrystallineSkyClientImpl {
 	public static void onEndTick(ClientTickEvent.Post event) {
 		CrystallineSkyClient.onEndTick(Minecraft.getInstance());
 	}
+
+	@SubscribeEvent
+	public static void buildCreativeModeTabContents(BuildCreativeModeTabContentsEvent event) {
+		event.insertAfter();
+	}
 }

neoforge/src/main/java/io/github/slimeistdev/crystalline_sky/neoforge/CrystallineSkyImpl.java

@@ -2,11 +2,16 @@ package io.github.slimeistdev.crystalline_sky.neoforge;
 
 import io.github.slimeistdev.crystalline_sky.CrystallineSky;
 import io.github.slimeistdev.crystalline_sky.multiloader.Env;
+import net.neoforged.bus.api.IEventBus;
 import net.neoforged.fml.common.Mod;
 
 @Mod(CrystallineSky.ID)
 public class CrystallineSkyImpl {
-	public CrystallineSkyImpl() {
+	static IEventBus bus;
+
+	public CrystallineSkyImpl(IEventBus bus) {
+		CrystallineSkyImpl.bus = bus;
+
 		CrystallineSky.init();
 		//noinspection Convert2MethodRef
 		Env.CLIENT.runIfCurrent(() -> () -> CrystallineSkyClientImpl.init());