44 lines
1.1 KiB
Java
44 lines
1.1 KiB
Java
package net.minecraft.world.level.levelgen;
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import net.minecraft.util.RandomSource;
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public class SingleThreadedRandomSource 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 long seed;
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private final MarsagliaPolarGaussian gaussianSource = new MarsagliaPolarGaussian(this);
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public SingleThreadedRandomSource(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 SingleThreadedRandomSource(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 = (seed ^ 25214903917L) & 281474976710655L;
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this.gaussianSource.reset();
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}
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@Override
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public int next(int size) {
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long l = this.seed * 25214903917L + 11L & 281474976710655L;
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this.seed = l;
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return (int)(l >> 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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