1 | #include "SkyPreetham.h"
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2 | #include "common.h"
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3 | #include "Vector3.h"
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4 | #include "SceneEntity.h"
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5 | #include "Transform3.h"
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6 | #include "Camera.h"
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7 | #include "RenderState.h"
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8 |
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9 | using namespace CHCDemoEngine;
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10 | using namespace std;
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11 |
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12 |
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13 |
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14 | static CGprogram sCgSkyProgram = NULL;
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15 | static CGprogram sCgMrtFragmentSkyDomeProgram = NULL;
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16 |
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17 |
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18 | static CGparameter sLightDirParam;
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19 | static CGparameter sThetaSunParam;
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20 | static CGparameter sZenithColorParam;
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21 | static CGparameter sAColorParam;
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22 | static CGparameter sBColorParam;
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23 | static CGparameter sCColorParam;
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24 | static CGparameter sDColorParam;
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25 | static CGparameter sEColorParam;
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26 |
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27 |
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28 | inline float CBQ(float x)
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29 | {
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30 | return x * x * x;
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31 | }
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32 |
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33 |
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34 | inline float SQR(float x)
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35 | {
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36 | return x * x ;
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37 | }
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38 |
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39 |
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40 | void SkyPreetham::Init(CGcontext context)
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41 | {
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42 | sCgSkyProgram =
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43 | cgCreateProgramFromFile(context,
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44 | CG_SOURCE,
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45 | "src/shaders/sky_preetham.cg",
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46 | RenderState::sCgVertexProfile,
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47 | "default_vs",
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48 | NULL);
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49 |
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50 | if (sCgSkyProgram != NULL)
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51 | {
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52 | cgGLLoadProgram(sCgSkyProgram);
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53 |
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54 | sLightDirParam = cgGetNamedParameter(sCgSkyProgram, "lightDir");
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55 | sThetaSunParam = cgGetNamedParameter(sCgSkyProgram, "thetaSun");
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56 | sZenithColorParam = cgGetNamedParameter(sCgSkyProgram, "zenithColor");
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57 | sAColorParam = cgGetNamedParameter(sCgSkyProgram, "aColor");
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58 | sBColorParam = cgGetNamedParameter(sCgSkyProgram, "bColor");
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59 | sCColorParam = cgGetNamedParameter(sCgSkyProgram, "cColor");
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60 | sDColorParam = cgGetNamedParameter(sCgSkyProgram, "dColor");
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61 | sEColorParam = cgGetNamedParameter(sCgSkyProgram, "eColor");
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62 | }
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63 | else
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64 | cerr << "sky program failed to load" << endl;
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65 |
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66 | sCgMrtFragmentSkyDomeProgram =
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67 | cgCreateProgramFromFile(context,
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68 | CG_SOURCE,
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69 | "src/shaders/sky_preetham.cg",
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70 | RenderState::sCgFragmentProfile,
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71 | "frag_skydome",
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72 | NULL);
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73 |
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74 | if (sCgMrtFragmentSkyDomeProgram != NULL)
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75 | {
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76 | cgGLLoadProgram(sCgMrtFragmentSkyDomeProgram);
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77 |
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78 | /*sMaxDepthParam = cgGetNamedParameter(RenderState::sCgMrtFragmentProgram, "maxDepth");
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79 | Material::sDiffuseParam = cgGetNamedParameter(RenderState::sCgMrtFragmentProgram, "diffuse");
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80 | Material::sAmbientParam = cgGetNamedParameter(RenderState::sCgMrtFragmentProgram, "ambient");
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81 |
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82 | cgGLSetParameter1f(sMaxDepthParam, MAX_DEPTH_CONST / farDist);
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83 | */
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84 | }
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85 | else
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86 | cerr << "fragment skyprogram failed to load" << endl;
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87 | }
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88 |
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89 |
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90 | SkyPreetham::SkyPreetham(float turbitity, SceneEntity *skyDome):
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91 | mSkyDome(skyDome),
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92 | mTurbidity(turbitity)
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93 | // mSunQuad(NULL)
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94 | {
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95 | CreateSunQuad();
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96 | }
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97 |
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98 |
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99 | SkyPreetham::~SkyPreetham()
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100 | {
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101 | //DEL_PTR(mSunQuad);
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102 | }
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103 |
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104 |
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105 | void SkyPreetham::RenderSkyDome(const Vector3 &sunDir, Camera *camera, RenderState *state)
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106 | {
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107 | pair<float, float> sun_theta;
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108 | Vector3 zenithColor;
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109 | vector<Vector3> ABCDE;
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110 | ComputeFactors(sunDir, zenithColor, ABCDE, sun_theta);
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111 |
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112 | // Move skybox with camera.
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113 | Vector3 position = camera->GetPosition();
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114 |
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115 | const float scaleFactor = 80.0f;
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116 | //const float scaleFactor = 5.0f;
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117 |
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118 | position.z -= 3 * scaleFactor;
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119 | Matrix4x4 m = TranslationMatrix(position);
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120 |
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121 | Matrix4x4 s = ScaleMatrix(scaleFactor, scaleFactor, scaleFactor);
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122 | mSkyDome->GetTransform()->SetMatrix(s * m);
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123 |
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124 | cgGLSetParameter3f(sLightDirParam, sunDir.x, sunDir.y, sunDir.z);
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125 | cgGLSetParameter2f(sThetaSunParam, sun_theta.first, sun_theta.second);
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126 | cgGLSetParameter3f(sZenithColorParam, zenithColor.x, zenithColor.y, zenithColor.z);
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127 |
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128 | cgGLSetParameter3f(sAColorParam, ABCDE[0].x, ABCDE[0].y, ABCDE[0].z);
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129 | cgGLSetParameter3f(sBColorParam, ABCDE[1].x, ABCDE[1].y, ABCDE[1].z);
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130 | cgGLSetParameter3f(sCColorParam, ABCDE[2].x, ABCDE[2].y, ABCDE[2].z);
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131 | cgGLSetParameter3f(sDColorParam, ABCDE[3].x, ABCDE[3].y, ABCDE[3].z);
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132 | cgGLSetParameter3f(sEColorParam, ABCDE[4].x, ABCDE[4].y, ABCDE[4].z);
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133 |
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134 | cgGLEnableProfile(RenderState::sCgVertexProfile);
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135 | cgGLBindProgram(sCgSkyProgram);
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136 |
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137 |
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138 | if (state->GetRenderPassType() == RenderState::DEFERRED)
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139 | {
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140 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
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141 | cgGLBindProgram(sCgMrtFragmentSkyDomeProgram);
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142 | }
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143 |
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144 | // Render sky dome.
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145 | mSkyDome->Render(state);
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146 |
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147 | // Render additively blended sun disc.
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148 | //RenderSunDisk(sunDir, camera);
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149 |
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150 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
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151 | }
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152 |
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153 |
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154 | void SkyPreetham::RenderSunDisk(const Vector3 &sunDir, Camera *camera)
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155 | {
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156 | // Move skybox with camera.
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157 | Vector3 position = camera->GetPosition();
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158 |
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159 | const float scaleFactor = 100.0f;
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160 | position.z -= 10 * scaleFactor;
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161 |
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162 | // Set world matrix to sun disc position.
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163 | Matrix4x4 sunPos = TranslationMatrix(position);
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164 |
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165 | Vector3 ndir = -Normalize(sunDir);
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166 |
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167 | const float pitch = -atan2(ndir.x, ndir.y);
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168 | const float yaw = atan2(ndir.z, sqrt((ndir.x * ndir.x) + (ndir.y * ndir.y)));
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169 |
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170 | Matrix4x4 roty = RotationYMatrix(pitch);
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171 | Matrix4x4 rotx = RotationXMatrix(yaw);
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172 |
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173 | sunPos *= roty;
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174 | sunPos *= rotx;;
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175 |
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176 | //sunposition.rotateAroundY(-D().getScene().getLight().getHorizontalOrientation() + 90.0f);
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177 | //sunposition.rotateAroundX(-D().getScene().getLight().getVerticalOrientation());
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178 |
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179 | glMatrixMode(GL_MODELVIEW);
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180 | glMultMatrixf((float *)sunPos.x);
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181 |
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182 | float ambient[] = {1.0f, 1.0f, 1.0f, 1.0f};
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183 |
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184 | glMaterialfv(GL_FRONT, GL_AMBIENT, ambient);
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185 |
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186 | //Float size = 0.5f + (1.0f - lightdirection.y) * 0.5f;
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187 |
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188 | //mSunEffect->setVariableVector3("LightDiffuseColor", D().getScene().getLight().getDiffuseColor());
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189 | //mSunEffect->setVariableFloat("SunSize", size);
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190 | //mSunEffect->setVariableTexture2D("SunTexture", mSunTexture);
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191 |
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192 | /*mSunEffect->activate();
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193 |
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194 | mSunQuad->render();
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195 |
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196 | mSunEffect->deactivate();
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197 | F().getRenderDevice().setDefaultBlendingMode(FRenderDevice::BLENDING_NONE);*/
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198 |
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199 | glPopMatrix();
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200 | }
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201 |
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202 |
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203 | void SkyPreetham::CreateSunQuad()
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204 | {
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205 | /*
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206 | mSunQuad = new FVertexBuffer();
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207 | mSunQuad->setupPrimitiveType(FVertexBuffer::PRIMITIVES_TRIANGLES);
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208 | mSunQuad->setupVertexFormat(3, 0, 0, true);
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209 | mSunQuad->setupTexCoordSet(0, 2);
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210 | mSunQuad->setVertexBufferSize(4, 6);
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211 |
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212 | mSunQuad->setVertexPosition(0, FVector3(-0.1f, 0.1f, 1.0f));
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213 | mSunQuad->setVertexPosition(1, FVector3( 0.1f, 0.1f, 1.0f));
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214 | mSunQuad->setVertexPosition(2, FVector3(-0.1f, -0.1f, 1.0f));
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215 | mSunQuad->setVertexPosition(3, FVector3( 0.1f, -0.1f, 1.0f));
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216 | mSunQuad->setVertexTexCoord(0, 0, FVector2(0.0f, 0.0f));
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217 | mSunQuad->setVertexTexCoord(1, 0, FVector2(1.0f, 0.0f));
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218 | mSunQuad->setVertexTexCoord(2, 0, FVector2(0.0f, 1.0f));
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219 | mSunQuad->setVertexTexCoord(3, 0, FVector2(1.0f, 1.0f));
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220 |
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221 | mSunQuad->setIndex(0, 0);
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222 | mSunQuad->setIndex(1, 1);
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223 | mSunQuad->setIndex(2, 2);
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224 | mSunQuad->setIndex(3, 2);
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225 | mSunQuad->setIndex(4, 1);
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226 | mSunQuad->setIndex(5, 3);
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227 | */
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228 | }
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229 |
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230 |
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231 | void SkyPreetham::ComputeFactors(const Vector3 &sunDir,
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232 | Vector3 &zenithColor,
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233 | vector<Vector3> &ABCDE,
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234 | std::pair<float, float> &sunThetha) const
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235 | {
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236 | sunThetha.first = acos(sunDir.z);
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237 |
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238 | const float cos_theta = cos(sunThetha.first);
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239 | sunThetha.second = cos_theta * cos_theta;
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240 |
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241 | zenithColor.x = ( 0.00165f * CBQ(sunThetha.first) - 0.00374f * SQR(sunThetha.first) + 0.00208f * sunThetha.first + 0.0f) * SQR(mTurbidity) +
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242 | (-0.02902f * CBQ(sunThetha.first) + 0.06377f * SQR(sunThetha.first) - 0.03202f * sunThetha.first + 0.00394f) * mTurbidity +
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243 | ( 0.11693f * CBQ(sunThetha.first) - 0.21196f * SQR(sunThetha.first) + 0.06052f * sunThetha.first + 0.25885f);
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244 |
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245 | zenithColor.y = ( 0.00275f * CBQ(sunThetha.first) - 0.00610f * SQR(sunThetha.first) + 0.00316f * sunThetha.first + 0.0f) * SQR(mTurbidity) +
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246 | (-0.04214f * CBQ(sunThetha.first) + 0.08970f * SQR(sunThetha.first) - 0.04153f * sunThetha.first + 0.00515f) * mTurbidity +
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247 | ( 0.15346f * CBQ(sunThetha.first) - 0.26756f * SQR(sunThetha.first) + 0.06669f * sunThetha.first + 0.26688f);
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248 |
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249 | zenithColor.z = (float)((4.0453f * mTurbidity - 4.9710f) * tan((4.0f / 9.0f - mTurbidity / 120.0f) *
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250 | (M_PI - 2.0f * sunThetha.first)) - 0.2155f * mTurbidity + 2.4192f);
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251 |
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252 | // convert kcd/m² to cd/m²
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253 | zenithColor.z *= 1000.0f;
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254 |
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255 | ABCDE.push_back(Vector3(-0.01925 * mTurbidity - 0.25922, -0.01669 * mTurbidity - 0.26078, 0.17872 * mTurbidity - 1.46303));
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256 | ABCDE.push_back(Vector3(-0.06651 * mTurbidity + 0.00081, -0.09495 * mTurbidity + 0.00921, -0.35540 * mTurbidity + 0.42749));
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257 | ABCDE.push_back(Vector3(-0.00041 * mTurbidity + 0.21247, -0.00792 * mTurbidity + 0.21023, -0.02266 * mTurbidity + 5.32505));
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258 | ABCDE.push_back(Vector3(-0.06409 * mTurbidity - 0.89887, -0.04405 * mTurbidity - 1.65369, 0.12064 * mTurbidity - 2.57705));
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259 | ABCDE.push_back(Vector3(-0.00325 * mTurbidity + 0.04517, -0.01092 * mTurbidity + 0.05291, -0.06696 * mTurbidity + 0.37027));
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260 | }
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261 |
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262 |
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263 | void SkyPreetham::ComputeSunColor(const Vector3 &sunDir, Vector3 &ambient, Vector3 &diffuse) const
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264 | {
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265 | // sunDir is sun direction
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266 | // ambient color: shadow color
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267 | // diffuse color: sun color
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268 | pair<float, float> sun_theta;
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269 | Vector3 zenithColor;
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270 | vector<Vector3> ABCDE;
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271 |
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272 | ComputeFactors(sunDir, zenithColor, ABCDE, sun_theta);
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273 |
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274 | Vector3 zenith_XYZ;
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275 |
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276 | zenith_XYZ.x = (zenithColor.x / zenithColor.y) * zenithColor.z;
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277 | zenith_XYZ.y = zenithColor.z;
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278 | zenith_XYZ.z = ((1.0f - zenithColor.x - zenithColor.y) / zenithColor.y) * zenithColor.z;
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279 |
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280 | ambient.x = 3.240479f * zenith_XYZ.x - 1.537150f * zenith_XYZ.y - 0.498535f * zenith_XYZ.z;
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281 | ambient.y = -0.969256f * zenith_XYZ.x + 1.875992f * zenith_XYZ.y + 0.041556f * zenith_XYZ.z;
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282 | ambient.z = 0.055648f * zenith_XYZ.x - 0.204043f * zenith_XYZ.y + 1.057311f * zenith_XYZ.z;
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283 |
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284 | // downscale ambient color
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285 | //ambient *= 5e-5f;
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286 | ambient *= 1e-1f;
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287 |
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288 | // simulate the sun intensity by modulating the ambient term.
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289 | ambient *= (10.0f - 9.0f * DotProd(sunDir, Vector3::UNIT_Z()));
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290 | //ambient += Vector3(0.2f);
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291 |
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292 | Vector3 num;
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293 |
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294 | num.x = (1.0f + ABCDE[0].x * exp(ABCDE[1].x / sunDir.z)) * (1.0f + ABCDE[2].x)+ ABCDE[4].x;
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295 | num.y = (1.0f + ABCDE[0].y * exp(ABCDE[1].y / sunDir.z)) * (1.0f + ABCDE[2].y)+ ABCDE[4].y;
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296 | num.z = (1.0f + ABCDE[0].z * exp(ABCDE[1].z / sunDir.z)) * (1.0f + ABCDE[2].z)+ ABCDE[4].z;
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297 |
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298 | Vector3 den;
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299 |
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300 | den.x = (1.0f + ABCDE[0].x * exp(ABCDE[1].x)) * (1.0f + ABCDE[2].x * exp(ABCDE[3].x * sun_theta.first) + ABCDE[4].x * sun_theta.second);
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301 | den.y = (1.0f + ABCDE[0].y * exp(ABCDE[1].y)) * (1.0f + ABCDE[2].y * exp(ABCDE[3].y * sun_theta.first) + ABCDE[4].y * sun_theta.second);
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302 | den.z = (1.0f + ABCDE[0].z * exp(ABCDE[1].z)) * (1.0f + ABCDE[2].z * exp(ABCDE[3].z * sun_theta.first) + ABCDE[4].z * sun_theta.second);
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303 |
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304 |
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305 | Vector3 xyY = zenithColor * num / den;
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306 |
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307 | Vector3 XYZ;
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308 |
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309 | XYZ.x = (xyY.x / xyY.y) * xyY.z;
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310 | XYZ.y = xyY.z;
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311 | XYZ.z = ((1.0f - xyY.x - xyY.y) / xyY.y) * xyY.z;
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312 |
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313 |
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314 | /////////////
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315 | //-- transform to rgb
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316 |
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317 | Vector3 color;
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318 | color.x = 3.240479f * XYZ.x - 1.537150f * XYZ.y - 0.498535f * XYZ.z;
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319 | color.y = -0.969256f * XYZ.x + 1.875992f * XYZ.y + 0.041556f *XYZ.z;
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320 | color.z = 0.055648f * XYZ.x - 0.204043f * XYZ.y + 1.057311f * XYZ.z;
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321 |
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322 | // Calculate final sun diffuse color.
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323 | diffuse = color * 3e-1f;
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324 | diffuse *= (2.0f - 1.0f * DotProd(sunDir, Vector3::UNIT_Z()));
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325 | //diffuse = color;
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326 |
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327 |
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328 | //cout << "diffuse: " << Magnitude(diffuse) << " ambient: " << Magnitude(ambient) << endl;
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329 | } |
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