Code/net/minecraft/world/level/levelgen/feature/trunkplacers/TrunkPlacer.java

package net.minecraft.world.level.levelgen.feature.trunkplacers;

import com.mojang.datafixers.Products.P3;
import com.mojang.serialization.Codec;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import com.mojang.serialization.codecs.RecordCodecBuilder.Mu;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.function.Function;
import net.minecraft.core.BlockPos;
import net.minecraft.core.registries.BuiltInRegistries;
import net.minecraft.tags.BlockTags;
import net.minecraft.util.RandomSource;
import net.minecraft.world.level.LevelSimulatedReader;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.levelgen.feature.Feature;
import net.minecraft.world.level.levelgen.feature.TreeFeature;
import net.minecraft.world.level.levelgen.feature.configurations.TreeConfiguration;
import net.minecraft.world.level.levelgen.feature.foliageplacers.FoliagePlacer;

public abstract class TrunkPlacer {
    public static final Codec<TrunkPlacer> CODEC = BuiltInRegistries.TRUNK_PLACER_TYPE.byNameCodec().dispatch(TrunkPlacer::type, TrunkPlacerType::codec);
    private static final int MAX_BASE_HEIGHT = 32;
    private static final int MAX_RAND = 24;
    public static final int MAX_HEIGHT = 80;
    protected final int baseHeight;
    protected final int heightRandA;
    protected final int heightRandB;

    protected static <P extends TrunkPlacer> P3<Mu<P>, Integer, Integer, Integer> trunkPlacerParts(Instance<P> p_70306_) {
        return p_70306_.group(
            Codec.intRange(0, 32).fieldOf("base_height").forGetter(p_70314_ -> p_70314_.baseHeight),
            Codec.intRange(0, 24).fieldOf("height_rand_a").forGetter(p_70312_ -> p_70312_.heightRandA),
            Codec.intRange(0, 24).fieldOf("height_rand_b").forGetter(p_70308_ -> p_70308_.heightRandB)
        );
    }

    public TrunkPlacer(int p_70268_, int p_70269_, int p_70270_) {
        this.baseHeight = p_70268_;
        this.heightRandA = p_70269_;
        this.heightRandB = p_70270_;
    }

    protected abstract TrunkPlacerType<?> type();

    public abstract List<FoliagePlacer.FoliageAttachment> placeTrunk(
        LevelSimulatedReader p_226157_,
        BiConsumer<BlockPos, BlockState> p_226158_,
        RandomSource p_226159_,
        int p_226160_,
        BlockPos p_226161_,
        TreeConfiguration p_226162_
    );

    public int getTreeHeight(RandomSource p_226154_) {
        return this.baseHeight + p_226154_.nextInt(this.heightRandA + 1) + p_226154_.nextInt(this.heightRandB + 1);
    }

    private static boolean isDirt(LevelSimulatedReader p_70296_, BlockPos p_70297_) {
        return p_70296_.isStateAtPosition(p_70297_, p_70304_ -> Feature.isDirt(p_70304_) && !p_70304_.is(Blocks.GRASS_BLOCK) && !p_70304_.is(Blocks.MYCELIUM));
    }

    protected static void setDirtAt(
        LevelSimulatedReader p_226170_, BiConsumer<BlockPos, BlockState> p_226171_, RandomSource p_226172_, BlockPos p_226173_, TreeConfiguration p_226174_
    ) {
        if (p_226174_.forceDirt || !isDirt(p_226170_, p_226173_)) {
            p_226171_.accept(p_226173_, p_226174_.dirtProvider.getState(p_226172_, p_226173_));
        }
    }

    protected boolean placeLog(
        LevelSimulatedReader p_226188_, BiConsumer<BlockPos, BlockState> p_226189_, RandomSource p_226190_, BlockPos p_226191_, TreeConfiguration p_226192_
    ) {
        return this.placeLog(p_226188_, p_226189_, p_226190_, p_226191_, p_226192_, Function.identity());
    }

    protected boolean placeLog(
        LevelSimulatedReader p_226176_,
        BiConsumer<BlockPos, BlockState> p_226177_,
        RandomSource p_226178_,
        BlockPos p_226179_,
        TreeConfiguration p_226180_,
        Function<BlockState, BlockState> p_226181_
    ) {
        if (this.validTreePos(p_226176_, p_226179_)) {
            p_226177_.accept(p_226179_, p_226181_.apply(p_226180_.trunkProvider.getState(p_226178_, p_226179_)));
            return true;
        } else {
            return false;
        }
    }

    protected void placeLogIfFree(
        LevelSimulatedReader p_226164_,
        BiConsumer<BlockPos, BlockState> p_226165_,
        RandomSource p_226166_,
        BlockPos.MutableBlockPos p_226167_,
        TreeConfiguration p_226168_
    ) {
        if (this.isFree(p_226164_, p_226167_)) {
            this.placeLog(p_226164_, p_226165_, p_226166_, p_226167_, p_226168_);
        }
    }

    protected boolean validTreePos(LevelSimulatedReader p_226155_, BlockPos p_226156_) {
        return TreeFeature.validTreePos(p_226155_, p_226156_);
    }

    public boolean isFree(LevelSimulatedReader p_226185_, BlockPos p_226186_) {
        return this.validTreePos(p_226185_, p_226186_) || p_226185_.isStateAtPosition(p_226186_, p_226183_ -> p_226183_.is(BlockTags.LOGS));
    }
}