Added thickHugeFungusGrowthFix rule (#1458)

src/main/java/carpet/CarpetSettings.java

@@ -1051,4 +1051,14 @@ public class CarpetSettings
     )
     public static int sculkSensorRange = 8;
 
+    public enum FungusFixMode {
+        FALSE, VANILLA, ALL;
+    }
+
+    @Rule(
+            desc = "Allows to grow nether trees with 3x3 base with bonemeal",
+            extra = {"Setting to 'all' will make all nether fungi grow into 3x3 trees", "Setting to 'vanilla' will make 6% of all nether fungi grow into 3x3 trees", "(this being consistent with worldgen)", "Fixes [MC-215169](https://bugs.mojang.com/browse/MC-215169)."},
+            category = {SURVIVAL, BUGFIX}
+    )
+    public static FungusFixMode thickHugeFungusGrowthFix = FungusFixMode.FALSE;
 }

src/main/java/carpet/mixins/HugeFungusFeatureMixin.java

@@ -0,0 +1,24 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.minecraft.util.RandomSource;
+import net.minecraft.world.level.levelgen.feature.HugeFungusConfiguration;
+import net.minecraft.world.level.levelgen.feature.HugeFungusFeature;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyArgs;
+import org.spongepowered.asm.mixin.injection.invoke.arg.Args;
+
+import static carpet.CarpetSettings.FungusFixMode.*;
+
+@Mixin(HugeFungusFeature.class)
+public class HugeFungusFeatureMixin {
+    @ModifyArgs(method = "place", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/level/levelgen/feature/HugeFungusFeature;placeStem(Lnet/minecraft/world/level/LevelAccessor;Lnet/minecraft/util/RandomSource;Lnet/minecraft/world/level/levelgen/feature/HugeFungusConfiguration;Lnet/minecraft/core/BlockPos;IZ)V"))
+    private void mixin(Args args) {
+        boolean natural = !((HugeFungusConfiguration) args.get(2)).planted;
+        args.set(5, natural && ((boolean) args.get(5)) ||
+            !natural && (CarpetSettings.thickHugeFungusGrowthFix.equals(ALL) ||
+            CarpetSettings.thickHugeFungusGrowthFix.equals(VANILLA) && ((RandomSource) args.get(1)).nextFloat() < 0.06F)
+        );
+    }
+}

src/main/resources/carpet.mixins.json

@@ -26,6 +26,7 @@
     "FlowingFluid_liquidDamageDisabledMixin",
     "ServerStatus_motdMixin",
     "MinecraftServer_pingPlayerSampleLimit",
+    "HugeFungusFeatureMixin",
 
     "MinecraftServer_coreMixin",