1 | #include "dxstdafx.h"
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2 | #include ".\hdrisampler.h"
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3 | #include "Vector.hpp"
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4 | #include "color.h"
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5 | #include "resolu.h"
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6 |
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7 | #define M_PI 3.14159265358979323846
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8 | #define M_PI_2 1.57079632679489661923
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9 | #define M_PI_4 0.785398163397448309616
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10 |
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11 |
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12 | HdriSampler::HdriSampler(void)
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13 | {
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14 | h2.SetBase(2);
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15 | h3.SetBase(3);
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16 | h5.SetBase(5);
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17 | hdriMap = NULL;
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18 | }
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19 |
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20 | HdriSampler::~HdriSampler(void)
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21 | {
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22 | }
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23 |
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24 |
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25 | Vector HdriSampler::getRadianceAt(const Vector& dir) const
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26 | {
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27 | bool edge = false;
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28 | float xval, yval;
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29 | int upper, left;
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30 | float fx, fy, fz;
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31 | fx = fabsf(dir.x);
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32 | fy = fabsf(dir.y);
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33 | fz = fabsf(dir.z);
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34 | if(dir.z > 0.0 && fz >= fy && fz >= fx)
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35 | {
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36 | upper = resolutiony / 4;
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37 | left = resolutionx / 3;
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38 | xval = dir.x / dir.z;
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39 | yval = dir.y / dir.z;
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40 | }
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41 | else
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42 | if(dir.z < 0.0 && fz >= fy && fz >= fx)
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43 | {
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44 | upper = 3 * resolutiony / 4;
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45 | left = resolutionx / 3;
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46 | xval = - dir.x / dir.z;
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47 | yval = dir.y / dir.z;
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48 | }
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49 | else
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50 | if(dir.x > 0.0 && fx >= fy && fx >= fz)
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51 | {
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52 | upper = resolutiony / 4;
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53 | left = 2 * resolutionx / 3;
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54 | xval = - dir.z / dir.x;
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55 | yval = dir.y / dir.x;
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56 | }
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57 | else
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58 | if(dir.x < 0.0 && fx >= fy && fx >= fz)
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59 | {
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60 | upper = resolutiony / 4;
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61 | left = 0;
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62 | xval = - dir.z / dir.x;
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63 | yval = - dir.y / dir.x;
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64 | }
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65 | else
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66 | if(dir.y > 0.0 && fy >= fx && fy >= fz)
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67 | {
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68 | upper = 0;
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69 | left = resolutionx / 3;
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70 | xval = dir.x / dir.y;
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71 | yval = - dir.z / dir.y;
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72 | }
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73 | else
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74 | if(dir.y < 0.0 && fy >= fx && fy >= fz)
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75 | {
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76 | upper = resolutiony / 2;
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77 | left = resolutionx / 3;
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78 | xval = - dir.x / dir.y;
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79 | yval = - dir.z / dir.y;
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80 | }
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81 | else
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82 | edge = true;
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83 |
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84 | if(!edge)
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85 | {
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86 | upper += ((-yval + 1.0f) * resolutiony) / 8.0;
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87 | left += ((xval + 1.0f) * resolutionx) / 6.0;
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88 | return hdriMap[left + upper * resolutionx];
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89 | }
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90 | else
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91 | return Vector::RGBBLACK;
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92 | }
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93 |
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94 | double HdriSampler::getImportance(const Vector& px)
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95 | {
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96 | // return 1.0;
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97 | Vector rad = getRadianceAt(px);
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98 | return rad.sum();
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99 | }
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100 | // HdriSampler commands
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101 |
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102 |
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103 | void HdriSampler::findMaxImportance()
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104 | {
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105 | maxImportance = 0.0;
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106 | for(int k=0; k<resolutionx; k++)
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107 | for(int j=0; j<resolutiony; j++)
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108 | {
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109 | double c = hdriMap[k + j * resolutionx].sum();
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110 | if(c > maxImportance)
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111 | maxImportance = c;
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112 | }
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113 | }
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114 |
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115 | void HdriSampler::calculatePowers()
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116 | {
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117 | powers.clear();
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118 | calculateRadii();
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119 | for(int i=0; i<samplePoints.size(); i++)
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120 | {
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121 | Vector bpower = getRadianceAt( samplePoints[i] );
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122 | bpower *= 3.14 * voronoiRadii[i] * voronoiRadii[i];
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123 | powers.push_back(bpower);
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124 | }
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125 | return;
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126 | int kbase = resolutionx/3;
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127 | int jbase = 0;
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128 | for(int k=0; k<resolutionx/3; k++)
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129 | for(int j=0; j<resolutiony/4; j++)
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130 | {
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131 | Vector pixdir;
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132 | pixdir.y = 1.0;
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133 | pixdir.x = ((double)k / resolutionx) * 6.0 - 1.0;
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134 | pixdir.z = (((double)j / resolutiony) * 8.0 - 1.0);
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135 | double formfactor = 1.0 / pixdir.norm2();
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136 | pixdir.normalize();
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137 | formfactor *= pixdir.y;
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138 | int di = voro.getNearestDirIndex(pixdir);
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139 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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140 | }
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141 | kbase = resolutionx/3;
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142 | jbase = resolutiony/2;
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143 | for(int k=0; k<resolutionx/3; k++)
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144 | for(int j=0; j<resolutiony/4; j++)
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145 | {
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146 | Vector pixdir;
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147 | pixdir.y = -1.0;
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148 | pixdir.x = (((double)k / resolutionx) * 6.0 - 1.0);
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149 | pixdir.z = -(((double)j / resolutiony) * 8.0 - 1.0);
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150 | double formfactor = 1.0 / pixdir.norm2();
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151 | pixdir.normalize();
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152 | formfactor *= -pixdir.y;
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153 | int di = voro.getNearestDirIndex(pixdir);
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154 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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155 | }
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156 | kbase = resolutionx/3;
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157 | jbase = resolutiony/4;
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158 | for(int k=0; k<resolutionx/3; k++)
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159 | for(int j=0; j<resolutiony/4; j++)
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160 | {
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161 | Vector pixdir;
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162 | pixdir.z = 1.0;
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163 | pixdir.x = ((double)k / resolutionx) * 6.0 - 1.0;
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164 | pixdir.y = -(((double)j / resolutiony) * 8.0 - 1.0);
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165 | double formfactor = 1.0 / pixdir.norm2();
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166 | pixdir.normalize();
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167 | formfactor *= pixdir.z;
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168 | int di = voro.getNearestDirIndex(pixdir);
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169 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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170 | }
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171 | kbase = resolutionx/3;
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172 | jbase = resolutiony/4*3;
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173 | for(int k=0; k<resolutionx/3; k++)
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174 | for(int j=0; j<resolutiony/4; j++)
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175 |
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176 | {
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177 | Vector pixdir;
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178 | pixdir.z = -1.0;
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179 | pixdir.x = (((double)k / resolutionx) * 6.0 - 1.0);
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180 | pixdir.y = ((double)j / resolutiony) * 8.0 - 1.0;
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181 | double formfactor = 1.0 / pixdir.norm2();
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182 | pixdir.normalize();
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183 | formfactor *= -pixdir.z;
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184 | int di = voro.getNearestDirIndex(pixdir);
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185 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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186 | }
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187 | kbase = resolutionx/3*2;
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188 | jbase = resolutiony/4;
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189 | for(int k=0; k<resolutionx/3; k++)
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190 | for(int j=0; j<resolutiony/4; j++)
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191 | {
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192 | Vector pixdir;
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193 | pixdir.x = 1.0;
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194 | pixdir.z = -(((double)k / resolutionx) * 6.0 - 1.0);
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195 | pixdir.y = -(((double)j / resolutiony) * 8.0 - 1.0);
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196 | double formfactor = 1.0 / pixdir.norm2();
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197 | pixdir.normalize();
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198 | formfactor *= pixdir.x;
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199 | int di = voro.getNearestDirIndex(pixdir);
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200 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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201 | }
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202 | kbase = 0;
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203 | jbase = resolutiony/4;
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204 | for(int k=0; k<resolutionx/3; k++)
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205 | for(int j=0; j<resolutiony/4; j++)
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206 | {
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207 | Vector pixdir;
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208 | pixdir.x = -1.0;
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209 | pixdir.z = (((double)k / resolutionx) * 6.0 - 1.0);
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210 | pixdir.y = -(((double)j / resolutiony) * 8.0 - 1.0);
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211 | double formfactor = 1.0 / pixdir.norm2();
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212 | pixdir.normalize();
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213 | formfactor *= -pixdir.x;
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214 | int di = voro.getNearestDirIndex(pixdir);
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215 | powers[di] += hdriMap[k + kbase + (j + jbase) * resolutionx] * formfactor;
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216 | }
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217 | }
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218 |
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219 | bool HdriSampler::loadHdrFile(char* filename)
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220 | {
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221 | FILE* file = fopen(filename, "r+b");
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222 | if(!file)
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223 | return false;
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224 | getheader(file, NULL, NULL);
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225 | RESOLU rs;
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226 | fgetsresolu(&rs, file);
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227 | resolutionx = scanlen(&rs);
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228 | resolutiony = numscans(&rs);
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229 | hdriMap = new Vector[resolutionx * resolutiony];
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230 | COLOR* loadhere = (COLOR*)hdriMap;
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231 | while(!feof(file))
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232 | {
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233 | freadscan(loadhere, resolutionx, file);
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234 | loadhere += resolutionx;
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235 | }
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236 | findMaxImportance();
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237 | return true;
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238 | }
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239 |
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240 | void HdriSampler::generatePoints(int nSamples)
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241 | {
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242 | //ASSERT(nSamples >= 4);
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243 | for(int i=0; i<nSamples; i++)
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244 | {
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245 | double fi = h2.Next() * 2.0 * M_PI;
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246 | double theta = asin(h3.Next() * 2.0 - 1);
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247 |
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248 | Vector np(cos(fi) * cos(theta), sin(fi) * cos(theta), sin(theta));
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249 | while(getImportance(np) / maxImportance < h5.Next())
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250 | {
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251 | rejectedPoints.push_back(np);
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252 | fi = h2.Next() * 2.0 * M_PI;
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253 | theta = asin(h3.Next() * 2.0 - 1);
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254 | np = Vector(cos(fi) * cos(theta), sin(fi) * cos(theta), sin(theta));
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255 | }
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256 | samplePoints.push_back(np);
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257 | voro.addDir(np);
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258 | }
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259 | // calculatePowers();
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260 |
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261 | }
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262 |
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263 | void HdriSampler::relax(int nSteps)
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264 | {
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265 | for(int i=0; i < nSteps; i++)
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266 | voro.relaxLloyd();
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267 | calculatePowers();
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268 | }
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269 |
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270 | void HdriSampler::calculateRadii()
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271 | {
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272 | voronoiRadii.clear();
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273 | for(int i=0; i<samplePoints.size(); i++)
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274 | voronoiRadii.push_back(0.0f);
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275 |
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276 | std::vector<VoronoiGenerator::Tri>::iterator a = voro.tris.begin();
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277 | std::vector<VoronoiGenerator::Tri>::iterator end = voro.tris.end();
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278 | while(a != end)
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279 | {
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280 | Vector la = (voro.dirs[a->bi] - voro.dirs[a->ai]);
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281 | Vector lb = (voro.dirs[a->ci] - voro.dirs[a->ai]);
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282 | double lcos = la * lb;
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283 | if(lcos >= 1.0)
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284 | lcos = 1.0;
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285 | double triArea =
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286 | sqrt(la.norm2() * la.norm2() * (1.0 - lcos * lcos)) / 4.0;
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287 | voronoiRadii[a->ai] += triArea;
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288 | voronoiRadii[a->bi] += triArea;
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289 | voronoiRadii[a->ci] += triArea;
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290 | a++;
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291 | }
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292 | float xx;
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293 | for(int g=0; g < samplePoints.size(); g++)
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294 | {
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295 | xx = sqrt(voronoiRadii[g] / 3.14);
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296 | voronoiRadii[g] = xx;
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297 | }
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298 | return;
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299 | } |
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