39 lines
1.1 KiB
Java
39 lines
1.1 KiB
Java
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package net.minecraft.world.level.levelgen;
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import net.minecraft.util.Mth;
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import net.minecraft.util.RandomSource;
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public class MarsagliaPolarGaussian {
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public final RandomSource randomSource;
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private double nextNextGaussian;
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private boolean haveNextNextGaussian;
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public MarsagliaPolarGaussian(RandomSource p_224204_) {
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this.randomSource = p_224204_;
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}
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public void reset() {
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this.haveNextNextGaussian = false;
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}
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public double nextGaussian() {
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if (this.haveNextNextGaussian) {
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this.haveNextNextGaussian = false;
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return this.nextNextGaussian;
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} else {
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double d0;
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double d1;
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double d2;
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do {
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d0 = 2.0 * this.randomSource.nextDouble() - 1.0;
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d1 = 2.0 * this.randomSource.nextDouble() - 1.0;
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d2 = Mth.square(d0) + Mth.square(d1);
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} while (d2 >= 1.0 || d2 == 0.0);
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double d3 = Math.sqrt(-2.0 * Math.log(d2) / d2);
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this.nextNextGaussian = d1 * d3;
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this.haveNextNextGaussian = true;
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return d0 * d3;
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}
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}
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}
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