80 lines
3.0 KiB
Java
80 lines
3.0 KiB
Java
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package net.minecraft.world.level.levelgen.synth;
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import it.unimi.dsi.fastutil.ints.IntRBTreeSet;
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import it.unimi.dsi.fastutil.ints.IntSortedSet;
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import java.util.List;
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import net.minecraft.util.RandomSource;
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import net.minecraft.world.level.levelgen.LegacyRandomSource;
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import net.minecraft.world.level.levelgen.WorldgenRandom;
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public class PerlinSimplexNoise {
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private final SimplexNoise[] noiseLevels;
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private final double highestFreqValueFactor;
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private final double highestFreqInputFactor;
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public PerlinSimplexNoise(RandomSource p_230546_, List<Integer> p_230547_) {
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this(p_230546_, new IntRBTreeSet(p_230547_));
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}
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private PerlinSimplexNoise(RandomSource p_230543_, IntSortedSet p_230544_) {
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if (p_230544_.isEmpty()) {
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throw new IllegalArgumentException("Need some octaves!");
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} else {
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int i = -p_230544_.firstInt();
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int j = p_230544_.lastInt();
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int k = i + j + 1;
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if (k < 1) {
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throw new IllegalArgumentException("Total number of octaves needs to be >= 1");
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} else {
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SimplexNoise simplexnoise = new SimplexNoise(p_230543_);
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int l = j;
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this.noiseLevels = new SimplexNoise[k];
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if (j >= 0 && j < k && p_230544_.contains(0)) {
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this.noiseLevels[j] = simplexnoise;
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}
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for (int i1 = j + 1; i1 < k; i1++) {
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if (i1 >= 0 && p_230544_.contains(l - i1)) {
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this.noiseLevels[i1] = new SimplexNoise(p_230543_);
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} else {
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p_230543_.consumeCount(262);
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}
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}
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if (j > 0) {
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long k1 = (long)(simplexnoise.getValue(simplexnoise.xo, simplexnoise.yo, simplexnoise.zo) * 9.223372E18F);
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RandomSource randomsource = new WorldgenRandom(new LegacyRandomSource(k1));
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for (int j1 = l - 1; j1 >= 0; j1--) {
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if (j1 < k && p_230544_.contains(l - j1)) {
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this.noiseLevels[j1] = new SimplexNoise(randomsource);
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} else {
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randomsource.consumeCount(262);
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}
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}
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}
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this.highestFreqInputFactor = Math.pow(2.0, j);
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this.highestFreqValueFactor = 1.0 / (Math.pow(2.0, k) - 1.0);
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}
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}
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}
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public double getValue(double p_75450_, double p_75451_, boolean p_75452_) {
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double d0 = 0.0;
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double d1 = this.highestFreqInputFactor;
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double d2 = this.highestFreqValueFactor;
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for (SimplexNoise simplexnoise : this.noiseLevels) {
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if (simplexnoise != null) {
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d0 += simplexnoise.getValue(p_75450_ * d1 + (p_75452_ ? simplexnoise.xo : 0.0), p_75451_ * d1 + (p_75452_ ? simplexnoise.yo : 0.0))
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* d2;
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}
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d1 /= 2.0;
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d2 *= 2.0;
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}
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return d0;
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}
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}
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