minecraft-src/net/minecraft/world/level/levelgen/feature/foliageplacers/FoliagePlacer.java

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

import com.mojang.datafixers.Products.P2;
import com.mojang.serialization.Codec;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import com.mojang.serialization.codecs.RecordCodecBuilder.Mu;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.registries.BuiltInRegistries;
import net.minecraft.util.RandomSource;
import net.minecraft.util.valueproviders.IntProvider;
import net.minecraft.world.level.LevelSimulatedReader;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.block.state.properties.BlockStateProperties;
import net.minecraft.world.level.levelgen.feature.TreeFeature;
import net.minecraft.world.level.levelgen.feature.configurations.TreeConfiguration;
import net.minecraft.world.level.material.Fluids;

public abstract class FoliagePlacer {
	public static final Codec<FoliagePlacer> CODEC = BuiltInRegistries.FOLIAGE_PLACER_TYPE.byNameCodec().dispatch(FoliagePlacer::type, FoliagePlacerType::codec);
	protected final IntProvider radius;
	protected final IntProvider offset;

	protected static <P extends FoliagePlacer> P2<Mu<P>, IntProvider, IntProvider> foliagePlacerParts(Instance<P> instance) {
		return instance.group(
			IntProvider.codec(0, 16).fieldOf("radius").forGetter(foliagePlacer -> foliagePlacer.radius),
			IntProvider.codec(0, 16).fieldOf("offset").forGetter(foliagePlacer -> foliagePlacer.offset)
		);
	}

	public FoliagePlacer(IntProvider radius, IntProvider offset) {
		this.radius = radius;
		this.offset = offset;
	}

	protected abstract FoliagePlacerType<?> type();

	public void createFoliage(
		LevelSimulatedReader level,
		FoliagePlacer.FoliageSetter blockSetter,
		RandomSource random,
		TreeConfiguration config,
		int maxFreeTreeHeight,
		FoliagePlacer.FoliageAttachment attachment,
		int foliageHeight,
		int foliageRadius
	) {
		this.createFoliage(level, blockSetter, random, config, maxFreeTreeHeight, attachment, foliageHeight, foliageRadius, this.offset(random));
	}

	protected abstract void createFoliage(
		LevelSimulatedReader level,
		FoliagePlacer.FoliageSetter blockSetter,
		RandomSource random,
		TreeConfiguration config,
		int maxFreeTreeHeight,
		FoliagePlacer.FoliageAttachment attachment,
		int foliageHeight,
		int foliageRadius,
		int offset
	);

	public abstract int foliageHeight(RandomSource random, int height, TreeConfiguration config);

	public int foliageRadius(RandomSource random, int radius) {
		return this.radius.sample(random);
	}

	private int offset(RandomSource random) {
		return this.offset.sample(random);
	}

	/**
	 * Skips certain positions based on the provided shape, such as rounding corners randomly.
	 * The coordinates are passed in as absolute value, and should be within [0, {@code range}].
	 */
	protected abstract boolean shouldSkipLocation(RandomSource random, int localX, int localY, int localZ, int range, boolean large);

	protected boolean shouldSkipLocationSigned(RandomSource random, int localX, int localY, int localZ, int range, boolean large) {
		int i;
		int j;
		if (large) {
			i = Math.min(Math.abs(localX), Math.abs(localX - 1));
			j = Math.min(Math.abs(localZ), Math.abs(localZ - 1));
		} else {
			i = Math.abs(localX);
			j = Math.abs(localZ);
		}

		return this.shouldSkipLocation(random, i, localY, j, range, large);
	}

	protected void placeLeavesRow(
		LevelSimulatedReader level,
		FoliagePlacer.FoliageSetter foliageSetter,
		RandomSource random,
		TreeConfiguration treeConfiguration,
		BlockPos pos,
		int range,
		int localY,
		boolean large
	) {
		int i = large ? 1 : 0;
		BlockPos.MutableBlockPos mutableBlockPos = new BlockPos.MutableBlockPos();

		for (int j = -range; j <= range + i; j++) {
			for (int k = -range; k <= range + i; k++) {
				if (!this.shouldSkipLocationSigned(random, j, localY, k, range, large)) {
					mutableBlockPos.setWithOffset(pos, j, localY, k);
					tryPlaceLeaf(level, foliageSetter, random, treeConfiguration, mutableBlockPos);
				}
			}
		}
	}

	protected final void placeLeavesRowWithHangingLeavesBelow(
		LevelSimulatedReader level,
		FoliagePlacer.FoliageSetter foliageSetter,
		RandomSource random,
		TreeConfiguration treeConfiguration,
		BlockPos pos,
		int range,
		int localY,
		boolean large,
		float hangingLeavesChance,
		float hangingLeavesExtensionChance
	) {
		this.placeLeavesRow(level, foliageSetter, random, treeConfiguration, pos, range, localY, large);
		int i = large ? 1 : 0;
		BlockPos blockPos = pos.below();
		BlockPos.MutableBlockPos mutableBlockPos = new BlockPos.MutableBlockPos();

		for (Direction direction : Direction.Plane.HORIZONTAL) {
			Direction direction2 = direction.getClockWise();
			int j = direction2.getAxisDirection() == Direction.AxisDirection.POSITIVE ? range + i : range;
			mutableBlockPos.setWithOffset(pos, 0, localY - 1, 0).move(direction2, j).move(direction, -range);
			int k = -range;

			while (k < range + i) {
				boolean bl = foliageSetter.isSet(mutableBlockPos.move(Direction.UP));
				mutableBlockPos.move(Direction.DOWN);
				if (bl && tryPlaceExtension(level, foliageSetter, random, treeConfiguration, hangingLeavesChance, blockPos, mutableBlockPos)) {
					mutableBlockPos.move(Direction.DOWN);
					tryPlaceExtension(level, foliageSetter, random, treeConfiguration, hangingLeavesExtensionChance, blockPos, mutableBlockPos);
					mutableBlockPos.move(Direction.UP);
				}

				k++;
				mutableBlockPos.move(direction);
			}
		}
	}

	private static boolean tryPlaceExtension(
		LevelSimulatedReader level,
		FoliagePlacer.FoliageSetter foliageSetter,
		RandomSource random,
		TreeConfiguration treeConfiguration,
		float extensionChance,
		BlockPos logPos,
		BlockPos.MutableBlockPos pos
	) {
		if (pos.distManhattan(logPos) >= 7) {
			return false;
		} else {
			return random.nextFloat() > extensionChance ? false : tryPlaceLeaf(level, foliageSetter, random, treeConfiguration, pos);
		}
	}

	protected static boolean tryPlaceLeaf(
		LevelSimulatedReader level, FoliagePlacer.FoliageSetter foliageSetter, RandomSource random, TreeConfiguration treeConfiguration, BlockPos pos
	) {
		boolean bl = level.isStateAtPosition(pos, blockStatex -> (Boolean)blockStatex.getValueOrElse(BlockStateProperties.PERSISTENT, false));
		if (!bl && TreeFeature.validTreePos(level, pos)) {
			BlockState blockState = treeConfiguration.foliageProvider.getState(random, pos);
			if (blockState.hasProperty(BlockStateProperties.WATERLOGGED)) {
				blockState = blockState.setValue(BlockStateProperties.WATERLOGGED, level.isFluidAtPosition(pos, fluidState -> fluidState.isSourceOfType(Fluids.WATER)));
			}

			foliageSetter.set(pos, blockState);
			return true;
		} else {
			return false;
		}
	}

	public static final class FoliageAttachment {
		private final BlockPos pos;
		private final int radiusOffset;
		private final boolean doubleTrunk;

		public FoliageAttachment(BlockPos pos, int radiusOffset, boolean doubleTrunk) {
			this.pos = pos;
			this.radiusOffset = radiusOffset;
			this.doubleTrunk = doubleTrunk;
		}

		public BlockPos pos() {
			return this.pos;
		}

		public int radiusOffset() {
			return this.radiusOffset;
		}

		public boolean doubleTrunk() {
			return this.doubleTrunk;
		}
	}

	public interface FoliageSetter {
		void set(BlockPos pos, BlockState state);

		boolean isSet(BlockPos pos);
	}
}