    001    package net.minecraft.world.gen;
    002
    003    import java.util.Random;
    004    import net.minecraft.util.MathHelper;
    005
    006    public 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 var3 = 0; var3 < par2; ++var3)
    020            {
    021                this.generatorCollection[var3] = 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 var14 = 0; var14 < par1ArrayOfDouble.length; ++var14)
    038                {
    039                    par1ArrayOfDouble[var14] = 0.0D;
    040                }
    041            }
    042
    043            double var27 = 1.0D;
    044
    045            for (int var16 = 0; var16 < this.octaves; ++var16)
    046            {
    047                double var17 = (double)par2 * var27 * par8;
    048                double var19 = (double)par3 * var27 * par10;
    049                double var21 = (double)par4 * var27 * par12;
    050                long var23 = MathHelper.floor_double_long(var17);
    051                long var25 = MathHelper.floor_double_long(var21);
    052                var17 -= (double)var23;
    053                var21 -= (double)var25;
    054                var23 %= 16777216L;
    055                var25 %= 16777216L;
    056                var17 += (double)var23;
    057                var21 += (double)var25;
    058                this.generatorCollection[var16].populateNoiseArray(par1ArrayOfDouble, var17, var19, var21, par5, par6, par7, par8 * var27, par10 * var27, par12 * var27, var27);
    059                var27 /= 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    }