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1 /* |
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2 * material.cc: material and texture classes |
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3 * |
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4 * This file is part of Pyrit Ray Tracer. |
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5 * |
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6 * Copyright 2006, 2008 Radek Brich |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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24 * THE SOFTWARE. |
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25 */ |
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26 |
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27 #include <math.h> |
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28 |
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29 #include "material.h" |
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30 |
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31 /** |
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32 * Perlin noise |
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33 * Based on JAVA REFERENCE IMPLEMENTATION OF IMPROVED NOISE by KEN PERLIN (COPYRIGHT 2002) |
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34 */ |
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35 |
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36 Float fade(Float t) |
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37 { |
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38 return t * t * t * (t * (t * 6 - 15) + 10); |
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39 } |
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40 |
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41 Float lerp(Float t, Float a, Float b) |
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42 { |
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43 return a + t * (b - a); |
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44 } |
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45 |
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46 Float grad(unsigned char hash, Float x, Float y, Float z) |
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47 { |
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48 unsigned char h = hash & 15; // CONVERT LO 4 BITS OF HASH CODE |
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49 Float u = h<8 ? x : y, // INTO 12 GRADIENT DIRECTIONS. |
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50 v = h<4 ? y : h==12||h==14 ? x : z; |
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51 return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v); |
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52 } |
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53 |
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54 const unsigned char p[512] = |
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55 { |
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56 151,160,137,91,90,15, |
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57 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23, |
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58 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33, |
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59 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166, |
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60 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244, |
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61 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196, |
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62 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123, |
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63 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42, |
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64 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9, |
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65 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228, |
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66 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107, |
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67 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254, |
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68 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180, |
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69 |
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70 151,160,137,91,90,15, |
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71 131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23, |
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72 190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33, |
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73 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166, |
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74 77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244, |
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75 102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196, |
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76 135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123, |
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77 5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42, |
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78 223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9, |
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79 129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228, |
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80 251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107, |
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81 49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254, |
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82 138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180 |
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83 }; |
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84 |
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85 |
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86 Float perlin(Float x, Float y, Float z) |
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87 { |
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88 int X = (int)floor(x) & 255, |
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89 Y = (int)floor(y) & 255, |
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90 Z = (int)floor(z) & 255; |
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91 x -= floor(x); |
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92 y -= floor(y); |
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93 z -= floor(z); |
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94 Float u = fade(x), |
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95 v = fade(y), |
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96 w = fade(z); |
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97 int A = p[X ]+Y, AA = p[A]+Z, AB = p[A+1]+Z, |
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98 B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z; |
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99 |
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100 return lerp(w, lerp(v, lerp(u, grad(p[AA ], x , y , z ), |
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101 grad(p[BA ], x-1, y , z )), |
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102 lerp(u, grad(p[AB ], x , y-1, z ), |
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103 grad(p[BB ], x-1, y-1, z ))), |
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104 lerp(v, lerp(u, grad(p[AA+1], x , y , z-1 ), |
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105 grad(p[BA+1], x-1, y , z-1 )), |
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106 lerp(u, grad(p[AB+1], x , y-1, z-1 ), |
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107 grad(p[BB+1], x-1, y-1, z-1 )))); |
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108 } |