Added simple class for custom noise in SurfaceRules

src/main/java/ru/bclib/api/biomes/SurfaceNoiseCondition.java

@@ -0,0 +1,39 @@
+package ru.bclib.api.biomes;
+
+import com.mojang.serialization.Codec;
+import net.minecraft.world.level.levelgen.SurfaceRules;
+import net.minecraft.world.level.levelgen.SurfaceRules.Condition;
+import net.minecraft.world.level.levelgen.SurfaceRules.ConditionSource;
+import net.minecraft.world.level.levelgen.SurfaceRules.Context;
+import net.minecraft.world.level.levelgen.SurfaceRules.LazyXZCondition;
+import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
+
+
+public abstract class SurfaceNoiseCondition implements SurfaceRules.ConditionSource{
+	@Override
+	public Codec<? extends ConditionSource> codec() {
+		return SurfaceRules.ConditionSource.CODEC;
+	}
+	
+	@Override
+	public final Condition apply(Context context2) {
+		final SurfaceNoiseCondition self = this;
+
+		class Generator extends LazyXZCondition {
+			Generator() {
+				super(context2);
+			}
+			
+			@Override
+			protected boolean compute() {
+				final SurfaceRulesContextAccessor context = SurfaceRulesContextAccessor.class.cast(this.context);
+				if (context==null) return false;
+				return self.test(context);
+			}
+		}
+
+		return new Generator();
+	}
+
+	public abstract boolean test(SurfaceRulesContextAccessor context);
+}

src/main/java/ru/bclib/api/biomes/SurfaceRuleBuilder.java

@@ -2,16 +2,24 @@ package ru.bclib.api.biomes;
 
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Registry;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.world.level.biome.Biome;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.ChunkAccess;
+import net.minecraft.world.level.levelgen.NoiseChunk;
 import net.minecraft.world.level.levelgen.SurfaceRules;
+import net.minecraft.world.level.levelgen.SurfaceRules.Condition;
 import net.minecraft.world.level.levelgen.SurfaceRules.RuleSource;
+import net.minecraft.world.level.levelgen.SurfaceSystem;
+import net.minecraft.world.level.levelgen.WorldGenerationContext;
 import net.minecraft.world.level.levelgen.placement.CaveSurface;
 
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Function;
 import java.util.function.Supplier;
 
 public class SurfaceRuleBuilder {

src/main/java/ru/bclib/mixin/common/SurfaceRulesContextAccessor.java

@@ -0,0 +1,38 @@
+package ru.bclib.mixin.common;
+
+import java.util.function.Supplier;
+
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.chunk.ChunkAccess;
+import net.minecraft.world.level.levelgen.NoiseChunk;
+import net.minecraft.world.level.levelgen.SurfaceRules;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(SurfaceRules.Context.class)
+public interface SurfaceRulesContextAccessor {
+    @Accessor("blockX")
+    int getBlockX();
+
+    @Accessor("blockY")
+    int getBlockY();
+
+    @Accessor("blockZ")
+    int getBlockZ();
+
+    @Accessor("surfaceDepth")
+    int getSurfaceDepth();
+
+    @Accessor("biome")
+    Supplier<Biome> getBiome();
+
+    @Accessor("biomeKey")
+    Supplier<ResourceKey<Biome>> getBiomeKey();
+
+    @Accessor("chunk")
+    ChunkAccess getChunk();
+
+    @Accessor("noiseChunk")
+    NoiseChunk getNoiseChunk();
+}

src/main/resources/bclib.accesswidener

@@ -3,4 +3,6 @@ accessWidener   v1  named
 # Classes
 accessible    class    net/minecraft/client/Minecraft$ExperimentalDialogType
 accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$Context
-accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$Condition
+accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$Condition
+accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$LazyXZCondition
+accessible    class    net/minecraft/world/level/levelgen/SurfaceRules$LazyCondition

src/main/resources/bclib.mixins.common.json

@@ -38,7 +38,8 @@
 		"AnvilBlockMixin",
 		"AnvilMenuMixin",
 		"TagLoaderMixin",
-		"MainMixin"
+		"MainMixin",
+		"SurfaceRulesContextAccessor"
 	],
 	"injectors": {
 		"defaultRequire": 1