001    package net.minecraft.src;
002    
003    import java.util.Random;
004    
005    public class NoiseGeneratorOctaves extends NoiseGenerator
006    {
007        /**
008         * Collection of noise generation functions.  Output is combined to produce different octaves of noise.
009         */
010        private NoiseGeneratorPerlin[] generatorCollection;
011        private int octaves;
012    
013        public NoiseGeneratorOctaves(Random par1Random, int par2)
014        {
015            this.octaves = par2;
016            this.generatorCollection = new NoiseGeneratorPerlin[par2];
017    
018            for (int var3 = 0; var3 < par2; ++var3)
019            {
020                this.generatorCollection[var3] = new NoiseGeneratorPerlin(par1Random);
021            }
022        }
023    
024        /**
025         * pars:(par2,3,4=noiseOffset ; so that adjacent noise segments connect) (pars5,6,7=x,y,zArraySize),(pars8,10,12 =
026         * x,y,z noiseScale)
027         */
028        public double[] generateNoiseOctaves(double[] par1ArrayOfDouble, int par2, int par3, int par4, int par5, int par6, int par7, double par8, double par10, double par12)
029        {
030            if (par1ArrayOfDouble == null)
031            {
032                par1ArrayOfDouble = new double[par5 * par6 * par7];
033            }
034            else
035            {
036                for (int var14 = 0; var14 < par1ArrayOfDouble.length; ++var14)
037                {
038                    par1ArrayOfDouble[var14] = 0.0D;
039                }
040            }
041    
042            double var27 = 1.0D;
043    
044            for (int var16 = 0; var16 < this.octaves; ++var16)
045            {
046                double var17 = (double)par2 * var27 * par8;
047                double var19 = (double)par3 * var27 * par10;
048                double var21 = (double)par4 * var27 * par12;
049                long var23 = MathHelper.floor_double_long(var17);
050                long var25 = MathHelper.floor_double_long(var21);
051                var17 -= (double)var23;
052                var21 -= (double)var25;
053                var23 %= 16777216L;
054                var25 %= 16777216L;
055                var17 += (double)var23;
056                var21 += (double)var25;
057                this.generatorCollection[var16].populateNoiseArray(par1ArrayOfDouble, var17, var19, var21, par5, par6, par7, par8 * var27, par10 * var27, par12 * var27, var27);
058                var27 /= 2.0D;
059            }
060    
061            return par1ArrayOfDouble;
062        }
063    
064        /**
065         * Bouncer function to the main one with some default arguments.
066         */
067        public double[] generateNoiseOctaves(double[] par1ArrayOfDouble, int par2, int par3, int par4, int par5, double par6, double par8, double par10)
068        {
069            return this.generateNoiseOctaves(par1ArrayOfDouble, par2, 10, par3, par4, 1, par5, par6, 1.0D, par8);
070        }
071    }