001package net.minecraft.world.gen;
002
003import java.util.Random;
004
005public class NoiseGeneratorPerlin extends NoiseGenerator
006{
007    private int[] permutations;
008    public double xCoord;
009    public double yCoord;
010    public double zCoord;
011
012    public NoiseGeneratorPerlin()
013    {
014        this(new Random());
015    }
016
017    public NoiseGeneratorPerlin(Random par1Random)
018    {
019        this.permutations = new int[512];
020        this.xCoord = par1Random.nextDouble() * 256.0D;
021        this.yCoord = par1Random.nextDouble() * 256.0D;
022        this.zCoord = par1Random.nextDouble() * 256.0D;
023        int var2;
024
025        for (var2 = 0; var2 < 256; this.permutations[var2] = var2++)
026        {
027            ;
028        }
029
030        for (var2 = 0; var2 < 256; ++var2)
031        {
032            int var3 = par1Random.nextInt(256 - var2) + var2;
033            int var4 = this.permutations[var2];
034            this.permutations[var2] = this.permutations[var3];
035            this.permutations[var3] = var4;
036            this.permutations[var2 + 256] = this.permutations[var2];
037        }
038    }
039
040    public final double lerp(double par1, double par3, double par5)
041    {
042        return par3 + par1 * (par5 - par3);
043    }
044
045    public final double func_76309_a(int par1, double par2, double par4)
046    {
047        int var6 = par1 & 15;
048        double var7 = (double)(1 - ((var6 & 8) >> 3)) * par2;
049        double var9 = var6 < 4 ? 0.0D : (var6 != 12 && var6 != 14 ? par4 : par2);
050        return ((var6 & 1) == 0 ? var7 : -var7) + ((var6 & 2) == 0 ? var9 : -var9);
051    }
052
053    public final double grad(int par1, double par2, double par4, double par6)
054    {
055        int var8 = par1 & 15;
056        double var9 = var8 < 8 ? par2 : par4;
057        double var11 = var8 < 4 ? par4 : (var8 != 12 && var8 != 14 ? par6 : par2);
058        return ((var8 & 1) == 0 ? var9 : -var9) + ((var8 & 2) == 0 ? var11 : -var11);
059    }
060
061    /**
062     * pars: noiseArray , xOffset , yOffset , zOffset , xSize , ySize , zSize , xScale, yScale , zScale , noiseScale.
063     * noiseArray should be xSize*ySize*zSize in size
064     */
065    public void populateNoiseArray(double[] par1ArrayOfDouble, double par2, double par4, double par6, int par8, int par9, int par10, double par11, double par13, double par15, double par17)
066    {
067        int var19;
068        int var22;
069        double var31;
070        double var35;
071        double var38;
072        int var37;
073        double var42;
074        int var40;
075        int var41;
076        int var10001;
077        int var77;
078
079        if (par9 == 1)
080        {
081            boolean var66 = false;
082            boolean var65 = false;
083            boolean var21 = false;
084            boolean var67 = false;
085            double var72 = 0.0D;
086            double var71 = 0.0D;
087            var77 = 0;
088            double var74 = 1.0D / par17;
089
090            for (int var30 = 0; var30 < par8; ++var30)
091            {
092                var31 = par2 + (double)var30 * par11 + this.xCoord;
093                int var78 = (int)var31;
094
095                if (var31 < (double)var78)
096                {
097                    --var78;
098                }
099
100                int var34 = var78 & 255;
101                var31 -= (double)var78;
102                var35 = var31 * var31 * var31 * (var31 * (var31 * 6.0D - 15.0D) + 10.0D);
103
104                for (var37 = 0; var37 < par10; ++var37)
105                {
106                    var38 = par6 + (double)var37 * par15 + this.zCoord;
107                    var40 = (int)var38;
108
109                    if (var38 < (double)var40)
110                    {
111                        --var40;
112                    }
113
114                    var41 = var40 & 255;
115                    var38 -= (double)var40;
116                    var42 = var38 * var38 * var38 * (var38 * (var38 * 6.0D - 15.0D) + 10.0D);
117                    var19 = this.permutations[var34] + 0;
118                    int var64 = this.permutations[var19] + var41;
119                    int var69 = this.permutations[var34 + 1] + 0;
120                    var22 = this.permutations[var69] + var41;
121                    var72 = this.lerp(var35, this.func_76309_a(this.permutations[var64], var31, var38), this.grad(this.permutations[var22], var31 - 1.0D, 0.0D, var38));
122                    var71 = this.lerp(var35, this.grad(this.permutations[var64 + 1], var31, 0.0D, var38 - 1.0D), this.grad(this.permutations[var22 + 1], var31 - 1.0D, 0.0D, var38 - 1.0D));
123                    double var79 = this.lerp(var42, var72, var71);
124                    var10001 = var77++;
125                    par1ArrayOfDouble[var10001] += var79 * var74;
126                }
127            }
128        }
129        else
130        {
131            var19 = 0;
132            double var20 = 1.0D / par17;
133            var22 = -1;
134            boolean var23 = false;
135            boolean var24 = false;
136            boolean var25 = false;
137            boolean var26 = false;
138            boolean var27 = false;
139            boolean var28 = false;
140            double var29 = 0.0D;
141            var31 = 0.0D;
142            double var33 = 0.0D;
143            var35 = 0.0D;
144
145            for (var37 = 0; var37 < par8; ++var37)
146            {
147                var38 = par2 + (double)var37 * par11 + this.xCoord;
148                var40 = (int)var38;
149
150                if (var38 < (double)var40)
151                {
152                    --var40;
153                }
154
155                var41 = var40 & 255;
156                var38 -= (double)var40;
157                var42 = var38 * var38 * var38 * (var38 * (var38 * 6.0D - 15.0D) + 10.0D);
158
159                for (int var44 = 0; var44 < par10; ++var44)
160                {
161                    double var45 = par6 + (double)var44 * par15 + this.zCoord;
162                    int var47 = (int)var45;
163
164                    if (var45 < (double)var47)
165                    {
166                        --var47;
167                    }
168
169                    int var48 = var47 & 255;
170                    var45 -= (double)var47;
171                    double var49 = var45 * var45 * var45 * (var45 * (var45 * 6.0D - 15.0D) + 10.0D);
172
173                    for (int var51 = 0; var51 < par9; ++var51)
174                    {
175                        double var52 = par4 + (double)var51 * par13 + this.yCoord;
176                        int var54 = (int)var52;
177
178                        if (var52 < (double)var54)
179                        {
180                            --var54;
181                        }
182
183                        int var55 = var54 & 255;
184                        var52 -= (double)var54;
185                        double var56 = var52 * var52 * var52 * (var52 * (var52 * 6.0D - 15.0D) + 10.0D);
186
187                        if (var51 == 0 || var55 != var22)
188                        {
189                            var22 = var55;
190                            int var68 = this.permutations[var41] + var55;
191                            int var73 = this.permutations[var68] + var48;
192                            int var70 = this.permutations[var68 + 1] + var48;
193                            int var76 = this.permutations[var41 + 1] + var55;
194                            var77 = this.permutations[var76] + var48;
195                            int var75 = this.permutations[var76 + 1] + var48;
196                            var29 = this.lerp(var42, this.grad(this.permutations[var73], var38, var52, var45), this.grad(this.permutations[var77], var38 - 1.0D, var52, var45));
197                            var31 = this.lerp(var42, this.grad(this.permutations[var70], var38, var52 - 1.0D, var45), this.grad(this.permutations[var75], var38 - 1.0D, var52 - 1.0D, var45));
198                            var33 = this.lerp(var42, this.grad(this.permutations[var73 + 1], var38, var52, var45 - 1.0D), this.grad(this.permutations[var77 + 1], var38 - 1.0D, var52, var45 - 1.0D));
199                            var35 = this.lerp(var42, this.grad(this.permutations[var70 + 1], var38, var52 - 1.0D, var45 - 1.0D), this.grad(this.permutations[var75 + 1], var38 - 1.0D, var52 - 1.0D, var45 - 1.0D));
200                        }
201
202                        double var58 = this.lerp(var56, var29, var31);
203                        double var60 = this.lerp(var56, var33, var35);
204                        double var62 = this.lerp(var49, var58, var60);
205                        var10001 = var19++;
206                        par1ArrayOfDouble[var10001] += var62 * var20;
207                    }
208                }
209            }
210        }
211    }
212}