Fixed the Nether cavegen

Author: mineLdiver

station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/NetherCaveGenMixin.java

@@ -0,0 +1,61 @@
+package net.modificationstation.stationapi.mixin.flattening;
+
+import net.minecraft.class_344;
+import net.modificationstation.stationapi.api.util.math.MathHelper;
+import net.modificationstation.stationapi.impl.world.CaveGenBaseImpl;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+import org.spongepowered.asm.mixin.injection.ModifyVariable;
+
+@Mixin(class_344.class)
+abstract class NetherCaveGenMixin implements CaveGenBaseImpl {
+    @ModifyConstant(
+            method = "method_1146",
+            constant = {
+                    @Constant(intValue = 1, ordinal = 8),
+                    @Constant(intValue = 1, ordinal = 9)
+            }
+    )
+    private int stationapi_changeBottomYP1Cap(int constant) {
+        return Math.max(stationapi_getWorld().getBottomY() + 1, constant);
+    }
+
+    @ModifyConstant(
+            method = "method_1146",
+            constant = @Constant(intValue = 120)
+    )
+    private int stationapi_changeTopYM8Cap(int constant) {
+        return Math.min(stationapi_getWorld().getTopY() - 8, constant);
+    }
+
+    @ModifyConstant(
+            method = "method_1146",
+            constant = {
+                    @Constant(intValue = 128, ordinal = 0),
+                    @Constant(intValue = 128, ordinal = 2)
+            }
+    )
+    private int stationapi_changeHeight(int constant) {
+        return MathHelper.smallestEncompassingPowerOfTwo(stationapi_getWorld().getHeight());
+    }
+
+    @ModifyVariable(
+            method = "method_1146",
+            at = @At(value = "STORE", ordinal = 0),
+            index = 43
+    )
+    private int stationapi_adjustForCustomDepth1(int value) {
+        return value - stationapi_getWorld().getBottomY();
+    }
+
+    @ModifyVariable(
+            method = "method_1146",
+            at = @At(value = "STORE", ordinal = 0),
+            index = 46
+    )
+    private int stationapi_adjustForCustomDepth2(int value) {
+        return value - stationapi_getWorld().getBottomY();
+    }
+}

station-flattening-v0/src/main/java/net/modificationstation/stationapi/mixin/flattening/NetherChunkGeneratorMixin.java

@@ -1,8 +1,12 @@
 package net.modificationstation.stationapi.mixin.flattening;
 
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import net.minecraft.class_344;
 import net.minecraft.class_359;
 import net.minecraft.world.World;
 import net.minecraft.world.chunk.Chunk;
+import net.modificationstation.stationapi.impl.world.CaveGenBaseImpl;
 import net.modificationstation.stationapi.impl.world.chunk.FlattenedChunk;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
@@ -13,6 +17,19 @@
 
 @Mixin(class_359.class)
 class NetherChunkGeneratorMixin {
+    @WrapOperation(
+            method = "<init>",
+            at = @At(
+                    value = "NEW",
+                    target = "()Lnet/minecraft/class_344;"
+            )
+    )
+    private class_344 stationapi_setWorldForCaveGen(Operation<class_344> original, World world, long l) {
+        final class_344 caveGen = original.call();
+        ((CaveGenBaseImpl) caveGen).stationapi_setWorld(world);
+        return caveGen;
+    }
+
     @Redirect(
             method = "method_1806",
             at = @At(

station-flattening-v0/src/main/resources/station-flattening-v0.mixins.json

@@ -21,6 +21,7 @@
     "ItemMixin",
     "ItemStackMixin",
     "MobSpawnerLogicMixin",
+    "NetherCaveGenMixin",
     "NetherChunkGeneratorMixin",
     "OakTreeFeatureMixin",
     "OverworldChunkGeneratorMixin",