ChunkGenerator

Author: cheyao

src/main/java/com/cyao/FlatMinecraft.java

@@ -1,6 +1,9 @@
 package com.cyao;
 
 import net.fabricmc.api.ModInitializer;
+import net.minecraft.registry.Registries;
+import net.minecraft.registry.Registry;
+import net.minecraft.util.Identifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -11,5 +14,9 @@ public class FlatMinecraft implements ModInitializer {
 	@Override
 	public void onInitialize() {
 		LOGGER.info("Initializing mod");
+
+		Registry.register(Registries.CHUNK_GENERATOR,
+				Identifier.of(MOD_ID, "paper_world"),
+				PaperWorldGenerator.CODEC);
 	}
 }

src/main/java/com/cyao/PaperWorldGenerator.java

@@ -0,0 +1,17 @@
+package com.cyao;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.registry.entry.RegistryEntry;
+import net.minecraft.world.biome.source.BiomeSource;
+import net.minecraft.world.gen.chunk.ChunkGeneratorSettings;
+import net.minecraft.world.gen.chunk.NoiseChunkGenerator;
+
+public class PaperWorldGenerator extends NoiseChunkGenerator {
+    private static final BlockState AIR = Blocks.AIR.getDefaultState();
+
+	public PaperWorldGenerator(BiomeSource biomeSource, RegistryEntry<ChunkGeneratorSettings> settings) {
+        super(biomeSource, settings);
+        System.out.println("Hello Paper Chunk Generator!");
+    }
+}

src/main/java/com/cyao/mixin/ChunkMixin.java

@@ -0,0 +1,45 @@
+package com.cyao.mixin;
+
+import com.cyao.FlatMinecraft;
+import com.cyao.PaperWorldGenerator;
+import net.minecraft.registry.RegistryEntryLookup;
+import net.minecraft.registry.RegistryKeys;
+import net.minecraft.registry.RegistryKey;
+import net.minecraft.registry.entry.RegistryEntry;
+import net.minecraft.util.Identifier;
+import net.minecraft.world.biome.source.MultiNoiseBiomeSource;
+import net.minecraft.world.biome.source.MultiNoiseBiomeSourceParameterList;
+import net.minecraft.world.biome.source.MultiNoiseBiomeSourceParameterLists;
+import net.minecraft.world.dimension.DimensionOptions;
+import net.minecraft.world.gen.WorldPresets;
+import net.minecraft.world.gen.WorldPreset;
+import net.minecraft.world.gen.chunk.ChunkGenerator;
+import net.minecraft.world.gen.chunk.ChunkGeneratorSettings;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(WorldPresets.Registrar.class)
+public abstract class WordPresetMixin {
+    @Unique
+    private static final RegistryKey<WorldPreset> PAPER_WORLD = RegistryKey.of(RegistryKeys.WORLD_PRESET, Identifier.of(FlatMinecraft.MOD_ID, "paper_world"));
+    @Shadow protected abstract void register(RegistryKey<WorldPreset> key, DimensionOptions dimensionOptions);
+    @Shadow protected abstract DimensionOptions createOverworldOptions(ChunkGenerator chunkGenerator);
+
+    @Shadow @Final private RegistryEntryLookup<ChunkGeneratorSettings> chunkGeneratorSettingsLookup;
+
+    @Shadow @Final private RegistryEntryLookup<MultiNoiseBiomeSourceParameterList> multiNoisePresetLookup;
+
+    @Inject(method = "bootstrap()V", at = @At("RETURN"), remap = false)
+    private void addPresets(CallbackInfo ci) {
+        this.register(PAPER_WORLD, this.createOverworldOptions(
+                new PaperWorldGenerator(
+                        MultiNoiseBiomeSource.create(this.multiNoisePresetLookup.getOrThrow(MultiNoiseBiomeSourceParameterLists.OVERWORLD)),
+                        this.chunkGeneratorSettingsLookup.getOrThrow(ChunkGeneratorSettings.OVERWORLD))
+        ));
+    }
+}

src/main/java/com/cyao/mixin/WordPresetMixin.java

@@ -0,0 +1,3 @@
+{
+  "generator.flat-minecraft.paper_world": "Nothing but Void"
+}

src/main/resources/assets/flat-minecraft/lang/en_us.json

@@ -0,0 +1,6 @@
+{
+  "replace": false,
+  "values": [
+    "flat-minecraft:paper_world"
+  ]
+}

src/main/resources/data/minecraft/tags/worldgen/world_preset/normal.json

@@ -4,4 +4,5 @@ accessible      method net/minecraft/world/gen/chunk/ChunkNoiseSampler createMul
 accessible class net/minecraft/world/gen/densityfunction/DensityFunctionTypes$Beardifier
 accessible method net/minecraft/world/gen/chunk/ChunkNoiseSampler getVerticalCellBlockCount ()I
 accessible method net/minecraft/world/gen/chunk/ChunkNoiseSampler getHorizontalCellBlockCount ()I
-accessible method net/minecraft/world/gen/chunk/ChunkNoiseSampler sampleBlockState ()Lnet/minecraft/block/BlockState;
+accessible method net/minecraft/world/gen/chunk/ChunkNoiseSampler sampleBlockState ()Lnet/minecraft/block/BlockState;
+extendable class net/minecraft/world/gen/chunk/NoiseChunkGenerator

src/main/resources/flat-minecraft.accesswidener

@@ -5,7 +5,7 @@
 	"mixins": [
         "CameraMixin",
 		"GameOptionsMixin",
-		"ChunkMixin"
+		"WordPresetMixin"
 	],
 	"injectors": {
 		"defaultRequire": 1