50 lines
1.3 KiB
Java
50 lines
1.3 KiB
Java
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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@Deprecated
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public class ThreadSafeLegacyRandomSource implements BitRandomSource {
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private static final int MODULUS_BITS = 48;
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private static final long MODULUS_MASK = 281474976710655L;
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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 ^ 25214903917L) & 281474976710655L);
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}
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@Override
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public int next(int size) {
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long l;
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long m;
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do {
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l = this.seed.get();
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m = l * 25214903917L + 11L & 281474976710655L;
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} while (!this.seed.compareAndSet(l, m));
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return (int)(m >>> 48 - size);
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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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