98 lines
3.1 KiB
Java
98 lines
3.1 KiB
Java
/*
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* Decompiled with CFR 0.152.
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*
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* Could not load the following classes:
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* com.google.common.annotations.VisibleForTesting
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*/
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package net.minecraft.world.level.levelgen;
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import com.google.common.annotations.VisibleForTesting;
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import java.util.concurrent.atomic.AtomicLong;
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import net.minecraft.util.Mth;
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import net.minecraft.util.RandomSource;
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import net.minecraft.util.ThreadingDetector;
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import net.minecraft.world.level.levelgen.BitRandomSource;
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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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public class LegacyRandomSource
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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 LegacyRandomSource(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 LegacyRandomSource(this.nextLong());
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}
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@Override
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public PositionalRandomFactory forkPositional() {
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return new 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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if (!this.seed.compareAndSet(this.seed.get(), (seed ^ 0x5DEECE66DL) & 0xFFFFFFFFFFFFL)) {
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throw ThreadingDetector.makeThreadingException("LegacyRandomSource", null);
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}
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this.gaussianSource.reset();
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}
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@Override
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public int next(int bits) {
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long newSeed;
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long oldSeed = this.seed.get();
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if (!this.seed.compareAndSet(oldSeed, newSeed = oldSeed * 25214903917L + 11L & 0xFFFFFFFFFFFFL)) {
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throw ThreadingDetector.makeThreadingException("LegacyRandomSource", null);
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}
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return (int)(newSeed >> 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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public static class LegacyPositionalRandomFactory
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implements PositionalRandomFactory {
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private final long seed;
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public LegacyPositionalRandomFactory(long seed) {
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this.seed = seed;
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}
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@Override
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public RandomSource at(int x, int y, int z) {
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long positionalSeed = Mth.getSeed(x, y, z);
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long randomSeed = positionalSeed ^ this.seed;
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return new LegacyRandomSource(randomSeed);
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}
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@Override
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public RandomSource fromHashOf(String name) {
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int positionalSeed = name.hashCode();
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return new LegacyRandomSource((long)positionalSeed ^ this.seed);
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}
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@Override
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public RandomSource fromSeed(long seed) {
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return new LegacyRandomSource(seed);
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}
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@Override
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@VisibleForTesting
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public void parityConfigString(StringBuilder sb) {
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sb.append("LegacyPositionalRandomFactory{").append(this.seed).append("}");
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}
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}
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}
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