Code/net/minecraft/world/level/chunk/CarvingMask.java

package net.minecraft.world.level.chunk;

import java.util.BitSet;
import java.util.stream.Stream;
import net.minecraft.core.BlockPos;
import net.minecraft.world.level.ChunkPos;

public class CarvingMask {
    private final int minY;
    private final BitSet mask;
    private CarvingMask.Mask additionalMask = (p_196713_, p_196714_, p_196715_) -> false;

    public CarvingMask(int p_187579_, int p_187580_) {
        this.minY = p_187580_;
        this.mask = new BitSet(256 * p_187579_);
    }

    public void setAdditionalMask(CarvingMask.Mask p_196711_) {
        this.additionalMask = p_196711_;
    }

    public CarvingMask(long[] p_187582_, int p_187583_) {
        this.minY = p_187583_;
        this.mask = BitSet.valueOf(p_187582_);
    }

    private int getIndex(int p_187599_, int p_187600_, int p_187601_) {
        return p_187599_ & 15 | (p_187601_ & 15) << 4 | p_187600_ - this.minY << 8;
    }

    public void set(int p_187586_, int p_187587_, int p_187588_) {
        this.mask.set(this.getIndex(p_187586_, p_187587_, p_187588_));
    }

    public boolean get(int p_187595_, int p_187596_, int p_187597_) {
        return this.additionalMask.test(p_187595_, p_187596_, p_187597_) || this.mask.get(this.getIndex(p_187595_, p_187596_, p_187597_));
    }

    public Stream<BlockPos> stream(ChunkPos p_187590_) {
        return this.mask.stream().mapToObj(p_196709_ -> {
            int i = p_196709_ & 15;
            int j = p_196709_ >> 4 & 15;
            int k = p_196709_ >> 8;
            return p_187590_.getBlockAt(i, k + this.minY, j);
        });
    }

    public long[] toArray() {
        return this.mask.toLongArray();
    }

    public interface Mask {
        boolean test(int p_196717_, int p_196718_, int p_196719_);
    }
}