57 lines
1.7 KiB
Java
57 lines
1.7 KiB
Java
/*
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* Decompiled with CFR 0.152.
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*/
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package net.minecraft.world.level.levelgen;
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import java.util.concurrent.atomic.AtomicLong;
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import net.minecraft.util.RandomSource;
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import net.minecraft.world.level.levelgen.BitRandomSource;
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import net.minecraft.world.level.levelgen.LegacyRandomSource;
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import net.minecraft.world.level.levelgen.MarsagliaPolarGaussian;
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import net.minecraft.world.level.levelgen.PositionalRandomFactory;
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@Deprecated
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public class ThreadSafeLegacyRandomSource
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implements BitRandomSource {
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private static final int MODULUS_BITS = 48;
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private static final long MODULUS_MASK = 0xFFFFFFFFFFFFL;
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private static final long MULTIPLIER = 25214903917L;
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private static final long INCREMENT = 11L;
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private final AtomicLong seed = new AtomicLong();
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private final MarsagliaPolarGaussian gaussianSource = new MarsagliaPolarGaussian(this);
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public ThreadSafeLegacyRandomSource(long seed) {
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this.setSeed(seed);
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}
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@Override
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public RandomSource fork() {
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return new ThreadSafeLegacyRandomSource(this.nextLong());
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}
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@Override
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public PositionalRandomFactory forkPositional() {
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return new LegacyRandomSource.LegacyPositionalRandomFactory(this.nextLong());
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}
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@Override
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public void setSeed(long seed) {
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this.seed.set((seed ^ 0x5DEECE66DL) & 0xFFFFFFFFFFFFL);
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}
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@Override
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public int next(int bits) {
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long nextSeed;
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long oldSeed;
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while (!this.seed.compareAndSet(oldSeed = this.seed.get(), nextSeed = oldSeed * 25214903917L + 11L & 0xFFFFFFFFFFFFL)) {
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}
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return (int)(nextSeed >>> 48 - bits);
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}
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@Override
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public double nextGaussian() {
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return this.gaussianSource.nextGaussian();
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}
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}
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