001package net.minecraft.world.gen;
002
003import java.util.Random;
004import net.minecraft.util.MathHelper;
005
006public class NoiseGeneratorOctaves extends NoiseGenerator
007{
008    /**
009     * Collection of noise generation functions.  Output is combined to produce different octaves of noise.
010     */
011    private NoiseGeneratorPerlin[] generatorCollection;
012    private int octaves;
013
014    public NoiseGeneratorOctaves(Random par1Random, int par2)
015    {
016        this.octaves = par2;
017        this.generatorCollection = new NoiseGeneratorPerlin[par2];
018
019        for (int j = 0; j < par2; ++j)
020        {
021            this.generatorCollection[j] = new NoiseGeneratorPerlin(par1Random);
022        }
023    }
024
025    /**
026     * pars:(par2,3,4=noiseOffset ; so that adjacent noise segments connect) (pars5,6,7=x,y,zArraySize),(pars8,10,12 =
027     * x,y,z noiseScale)
028     */
029    public double[] generateNoiseOctaves(double[] par1ArrayOfDouble, int par2, int par3, int par4, int par5, int par6, int par7, double par8, double par10, double par12)
030    {
031        if (par1ArrayOfDouble == null)
032        {
033            par1ArrayOfDouble = new double[par5 * par6 * par7];
034        }
035        else
036        {
037            for (int k1 = 0; k1 < par1ArrayOfDouble.length; ++k1)
038            {
039                par1ArrayOfDouble[k1] = 0.0D;
040            }
041        }
042
043        double d3 = 1.0D;
044
045        for (int l1 = 0; l1 < this.octaves; ++l1)
046        {
047            double d4 = (double)par2 * d3 * par8;
048            double d5 = (double)par3 * d3 * par10;
049            double d6 = (double)par4 * d3 * par12;
050            long i2 = MathHelper.floor_double_long(d4);
051            long j2 = MathHelper.floor_double_long(d6);
052            d4 -= (double)i2;
053            d6 -= (double)j2;
054            i2 %= 16777216L;
055            j2 %= 16777216L;
056            d4 += (double)i2;
057            d6 += (double)j2;
058            this.generatorCollection[l1].populateNoiseArray(par1ArrayOfDouble, d4, d5, d6, par5, par6, par7, par8 * d3, par10 * d3, par12 * d3, d3);
059            d3 /= 2.0D;
060        }
061
062        return par1ArrayOfDouble;
063    }
064
065    /**
066     * Bouncer function to the main one with some default arguments.
067     */
068    public double[] generateNoiseOctaves(double[] par1ArrayOfDouble, int par2, int par3, int par4, int par5, double par6, double par8, double par10)
069    {
070        return this.generateNoiseOctaves(par1ArrayOfDouble, par2, 10, par3, par4, 1, par5, par6, 1.0D, par8);
071    }
072}