Code/net/minecraft/world/level/levelgen/WorldgenRandom.java

package net.minecraft.world.level.levelgen;

import java.util.function.LongFunction;
import net.minecraft.util.RandomSource;

public class WorldgenRandom extends LegacyRandomSource {
    private final RandomSource randomSource;
    private int count;

    public WorldgenRandom(RandomSource p_224680_) {
        super(0L);
        this.randomSource = p_224680_;
    }

    public int getCount() {
        return this.count;
    }

    @Override
    public RandomSource fork() {
        return this.randomSource.fork();
    }

    @Override
    public PositionalRandomFactory forkPositional() {
        return this.randomSource.forkPositional();
    }

    @Override
    public int next(int p_64708_) {
        this.count++;
        return this.randomSource instanceof LegacyRandomSource legacyrandomsource
            ? legacyrandomsource.next(p_64708_)
            : (int)(this.randomSource.nextLong() >>> 64 - p_64708_);
    }

    @Override
    public synchronized void setSeed(long p_190073_) {
        if (this.randomSource != null) {
            this.randomSource.setSeed(p_190073_);
        }
    }

    public long setDecorationSeed(long p_64691_, int p_64692_, int p_64693_) {
        this.setSeed(p_64691_);
        long i = this.nextLong() | 1L;
        long j = this.nextLong() | 1L;
        long k = p_64692_ * i + p_64693_ * j ^ p_64691_;
        this.setSeed(k);
        return k;
    }

    public void setFeatureSeed(long p_190065_, int p_190066_, int p_190067_) {
        long i = p_190065_ + p_190066_ + 10000 * p_190067_;
        this.setSeed(i);
    }

    public void setLargeFeatureSeed(long p_190069_, int p_190070_, int p_190071_) {
        this.setSeed(p_190069_);
        long i = this.nextLong();
        long j = this.nextLong();
        long k = p_190070_ * i ^ p_190071_ * j ^ p_190069_;
        this.setSeed(k);
    }

    public void setLargeFeatureWithSalt(long p_190059_, int p_190060_, int p_190061_, int p_190062_) {
        long i = p_190060_ * 341873128712L + p_190061_ * 132897987541L + p_190059_ + p_190062_;
        this.setSeed(i);
    }

    public static RandomSource seedSlimeChunk(int p_224682_, int p_224683_, long p_224684_, long p_224685_) {
        return RandomSource.create(
            p_224684_ + p_224682_ * p_224682_ * 4987142 + p_224682_ * 5947611 + p_224683_ * p_224683_ * 4392871L + p_224683_ * 389711 ^ p_224685_
        );
    }

    public static enum Algorithm {
        LEGACY(LegacyRandomSource::new),
        XOROSHIRO(XoroshiroRandomSource::new);

        private final LongFunction<RandomSource> constructor;

        private Algorithm(final LongFunction<RandomSource> p_190082_) {
            this.constructor = p_190082_;
        }

        public RandomSource newInstance(long p_224688_) {
            return this.constructor.apply(p_224688_);
        }
    }
}