1 | #include "SsaoShader.h"
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2 | #include "FrameBufferObject.h"
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3 | #include "RenderState.h"
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4 | #include "SampleGenerator.h"
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5 | #include "Vector3.h"
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6 | #include "Camera.h"
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7 | #include "shaderenv.h"
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8 | #include "RndGauss.h"
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9 | #include "Halton.h"
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10 |
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11 |
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12 | using namespace std;
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13 |
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14 | static GLenum mymrt[] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT};
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15 |
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16 |
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17 | namespace CHCDemoEngine
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18 | {
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19 |
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20 | static CGprogram sCgSsaoProgram = NULL;
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21 | static CGprogram sCgGiProgram = NULL;
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22 |
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23 | static CGprogram sCgDeferredProgram = NULL;
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24 | static CGprogram sCgAntiAliasingProgram = NULL;
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25 |
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26 | static CGparameter sColorsTexCombineParam;
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27 | static CGparameter sSsaoTexCombineParam;
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28 |
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29 | static CGparameter sColorsTexDeferredParam;
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30 | static CGparameter sPositionsTexDeferredParam;
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31 | static CGparameter sNormalsTexDeferredParam;
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32 |
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33 |
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34 | static CGprogram sCgCombinedSsaoProgram = NULL;
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35 | static CGprogram sCgCombinedIllumProgram = NULL;
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36 |
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37 | ///////////////////////////////////////7
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38 |
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39 |
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40 | static CGparameter sColorsTexParam;
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41 | static CGparameter sPositionsTexParam;
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42 | static CGparameter sNormalsTexParam;
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43 |
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44 | static CGparameter sOldModelViewProjMatrixParam;
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45 | static CGparameter sMaxDepthParam;
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46 | static CGparameter sSamplesParam;
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47 | static CGparameter sOldTexParam;
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48 | static CGparameter sNoiseTexParam;
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49 | static CGparameter sNoiseMultiplierParam;
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50 | static CGparameter sExpFactorParam;
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51 |
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52 |
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53 |
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54 | ///////////////////////////////////////
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55 |
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56 |
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57 | static CGparameter sColorsTexGiParam;
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58 | static CGparameter sPositionsTexGiParam;
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59 | static CGparameter sNormalsTexGiParam;
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60 |
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61 |
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62 | static CGparameter sOldModelViewProjMatrixGiParam;
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63 | static CGparameter sMaxDepthGiParam;
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64 | static CGparameter sSamplesGiParam;
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65 | static CGparameter sOldSsaoTexGiParam;
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66 | static CGparameter sOldIllumTexGiParam;
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67 | static CGparameter sNoiseTexGiParam;
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68 | static CGparameter sNoiseMultiplierGiParam;
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69 | static CGparameter sExpFactorGiParam;
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70 |
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71 |
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72 | static CGparameter sColorsTexCombinedIllumParam;
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73 | static CGparameter sSsaoTexCombinedIllumParam;
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74 | static CGparameter sIllumTexCombinedIllumParam;
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75 |
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76 | static CGparameter sColorsTexCombinedSsaoParam;
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77 | static CGparameter sSsaoTexCombinedSsaoParam;
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78 |
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79 |
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80 | ////////////
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81 |
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82 | static CGparameter sColorsTexAntiAliasingParam;
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83 | static CGparameter sNormalsTexAntiAliasingParam;
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84 |
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85 | static GLuint noiseTex = 0;
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86 |
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87 | // ssao random spherical samples
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88 | static Sample2 samples[NUM_SAMPLES];
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89 |
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90 |
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91 | static void PrintGLerror(char *msg)
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92 | {
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93 | GLenum errCode;
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94 | const GLubyte *errStr;
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95 |
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96 | if ((errCode = glGetError()) != GL_NO_ERROR)
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97 | {
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98 | errStr = gluErrorString(errCode);
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99 | fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
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100 | }
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101 | }
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102 |
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103 |
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104 | /** Generate poisson disc distributed sample points on the unit disc
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105 | */
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106 | static void GenerateSamples(int sampling)
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107 | {
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108 | switch (sampling)
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109 | {
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110 | case SsaoShader::POISSON:
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111 | {
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112 | static PoissonDiscSampleGenerator poisson(NUM_SAMPLES, 1.0f);
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113 | poisson.Generate((Sample2 *)samples);
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114 | }
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115 | break;
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116 | case SsaoShader::GAUSS:
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117 | {
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118 | const float radius = 1.0f;
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119 | const float sigma = 0.25f;//ComputeSigmaFromRadius(1.0f);
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120 |
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121 | static HaltonSequence halton;
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122 |
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123 | for (int i = 0; i < NUM_SAMPLES; ++ i)
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124 | {
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125 | Sample2 s;
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126 | Vector3 input;
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127 |
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128 | halton.GetNext(3, (float *)&input.x);
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129 |
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130 | //GaussianOn2D(cinput, // input (RND in interval [0-1)x[0-1))
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131 | // sigma, // standard deviation of gaussian distribution
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132 | // outputVec) // resulting vector according to gaussian distr.
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133 |
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134 | PolarGaussianOnDisk(input, // input (RND in interval [0-1)x[0-1))
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135 | sigma, // standard deviation of gaussian distribution
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136 | radius, // standard deviation of gaussian distribution
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137 | s); // result
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138 | samples[i] = s;
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139 | }
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140 | }
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141 | break;
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142 | default:
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143 | break;
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144 | }
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145 | }
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146 |
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147 |
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148 | static void CreateNoiseTex2D(int w, int h)
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149 | {
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150 | //GLubyte *randomNormals = new GLubyte[mWidth * mHeight * 3];
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151 | float *randomNormals = new float[w * h * 3];
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152 |
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153 | for (int i = 0; i < w * h * 3; i += 3)
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154 | {
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155 | // create random samples on a circle
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156 | const float rx = RandomValue(0, 1);
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157 | const float theta = 2.0f * acos(sqrt(1.0f - rx));
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158 |
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159 | //randomNormals[i + 0] = (GLubyte)((cos(theta) * 0.5f + 0.5f) * 255.0f);
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160 | //randomNormals[i + 1] = (GLubyte)((sin(theta) * 0.5f + 0.5f) * 255.0f);
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161 | randomNormals[i + 0] = cos(theta);
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162 | randomNormals[i + 1] = sin(theta);
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163 | randomNormals[i + 2] = 0;
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164 | }
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165 |
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166 | glEnable(GL_TEXTURE_2D);
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167 | glGenTextures(1, &noiseTex);
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168 | glBindTexture(GL_TEXTURE_2D, noiseTex);
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169 |
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170 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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171 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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172 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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173 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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174 |
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175 | //glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, randomNormals);
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176 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, w, h, 0, GL_RGB, GL_FLOAT, randomNormals);
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177 |
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178 | glBindTexture(GL_TEXTURE_2D, 0);
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179 | glDisable(GL_TEXTURE_2D);
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180 |
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181 | delete [] randomNormals;
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182 |
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183 | cout << "created noise texture" << endl;
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184 |
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185 | PrintGLerror("noisetexture");
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186 | }
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187 |
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188 |
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189 | SsaoShader::SsaoShader(int w, int h, Camera *cam, float scaleFactor):
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190 | mWidth(w), mHeight(h),
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191 | mCamera(cam),
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192 | mScaleFactor(scaleFactor),
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193 | mUseTemporalCoherence(true),
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194 | mUseGlobIllum(false),
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195 | mSampling(POISSON)
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196 | {
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197 | // create noise texture for ssao
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198 | CreateNoiseTex2D(w, h);
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199 |
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200 | ///////////
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201 | //-- the flip-flop fbos
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202 |
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203 | mNewFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
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204 |
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205 | mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
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206 | mNewFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
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207 |
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208 |
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209 | ///////////////////////
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210 |
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211 | mOldFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
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212 |
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213 | mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
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214 | mOldFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);
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215 |
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216 | //mFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
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217 | //mFbo->AddColorBuffer(ColorBufferObject::BUFFER_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR, false);*/
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218 | }
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219 |
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220 |
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221 | SsaoShader::~SsaoShader()
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222 | {
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223 | if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
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224 | if (sCgDeferredProgram) cgDestroyProgram(sCgDeferredProgram);
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225 | if (sCgSsaoProgram) cgDestroyProgram(sCgSsaoProgram);
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226 | if (sCgGiProgram) cgDestroyProgram(sCgGiProgram);
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227 | if (sCgAntiAliasingProgram) cgDestroyProgram(sCgAntiAliasingProgram);
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228 |
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229 | DEL_PTR(mNewFbo);
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230 | DEL_PTR(mOldFbo);
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231 | //DEL_PTR(mFbo);
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232 |
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233 | glDeleteTextures(1, &noiseTex);
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234 | }
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235 |
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236 |
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237 | void SsaoShader::SetUseGlobIllum(bool useGlobIllum)
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238 | {
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239 | mUseGlobIllum = useGlobIllum;
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240 | }
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241 |
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242 |
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243 | void SsaoShader::SetUseTemporalCoherence(bool temporal)
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244 | {
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245 | mUseTemporalCoherence = temporal;
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246 | }
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247 |
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248 |
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249 | void SsaoShader::Init(CGcontext context)
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250 | {
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251 | sCgDeferredProgram =
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252 | cgCreateProgramFromFile(context,
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253 | CG_SOURCE,
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254 | "src/shaders/deferred.cg",
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255 | RenderState::sCgFragmentProfile,
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256 | "main",
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257 | NULL);
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258 |
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259 | if (sCgDeferredProgram != NULL)
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260 | {
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261 | cgGLLoadProgram(sCgDeferredProgram);
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262 |
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263 | // we need size of texture for scaling
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264 | sPositionsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "positions");
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265 | sColorsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "colors");
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266 | sNormalsTexDeferredParam = cgGetNamedParameter(sCgDeferredProgram, "normals");
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267 | }
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268 | else
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269 | cerr << "deferred program failed to load" << endl;
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270 |
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271 |
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272 | ///////////////
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273 |
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274 | sCgSsaoProgram =
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275 | cgCreateProgramFromFile(context,
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276 | CG_SOURCE,
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277 | "src/shaders/ssao.cg",
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278 | RenderState::sCgFragmentProfile,
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279 | "main",
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280 | NULL);
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281 |
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282 | if (sCgSsaoProgram != NULL)
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283 | {
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284 | cgGLLoadProgram(sCgSsaoProgram);
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285 |
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286 | // we need size of texture for scaling
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287 | sPositionsTexParam = cgGetNamedParameter(sCgSsaoProgram, "positions");
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288 | sColorsTexParam = cgGetNamedParameter(sCgSsaoProgram, "colors");
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289 | sNormalsTexParam = cgGetNamedParameter(sCgSsaoProgram, "normals");
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290 | sNoiseTexParam = cgGetNamedParameter(sCgSsaoProgram, "noiseTexture");
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291 | sNoiseMultiplierParam = cgGetNamedParameter(sCgSsaoProgram, "noiseMultiplier");
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292 |
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293 | sOldModelViewProjMatrixParam = cgGetNamedParameter(sCgSsaoProgram, "oldModelViewProj");
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294 | sMaxDepthParam = cgGetNamedParameter(sCgSsaoProgram, "maxDepth");
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295 | sExpFactorParam = cgGetNamedParameter(sCgSsaoProgram, "expFactor");
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296 |
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297 | sOldTexParam = cgGetNamedParameter(sCgSsaoProgram, "oldTex");
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298 |
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299 | cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
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300 |
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301 | // generate samples for ssao kernel
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302 | //GenerateSamples(mSampling);
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303 |
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304 | sSamplesParam = cgGetNamedParameter(sCgSsaoProgram, "samples");
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305 | //cgSetArraySize(sSamplesParam, NUM_SAMPLES);
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306 | //cgCompileProgram(sCgSsaoProgram);
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307 |
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308 | //cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
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309 | }
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310 | else
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311 | cerr << "ssao program failed to load" << endl;
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312 |
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313 | sCgGiProgram =
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314 | cgCreateProgramFromFile(context,
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315 | CG_SOURCE,
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316 | "src/shaders/globillum.cg",
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317 | RenderState::sCgFragmentProfile,
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318 | "main",
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319 | NULL);
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320 |
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321 | if (sCgGiProgram != NULL)
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322 | {
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323 | cgGLLoadProgram(sCgGiProgram);
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324 |
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325 | // we need size of texture for scaling
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326 | sPositionsTexGiParam = cgGetNamedParameter(sCgGiProgram, "positions");
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327 | sColorsTexGiParam = cgGetNamedParameter(sCgGiProgram, "colors");
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328 | sNormalsTexGiParam = cgGetNamedParameter(sCgGiProgram, "normals");
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329 | sNoiseTexGiParam = cgGetNamedParameter(sCgGiProgram, "noiseTexture");
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330 | sNoiseMultiplierGiParam = cgGetNamedParameter(sCgGiProgram, "noiseMultiplier");
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331 |
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332 | sOldModelViewProjMatrixGiParam = cgGetNamedParameter(sCgGiProgram, "oldModelViewProj");
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333 | sMaxDepthGiParam = cgGetNamedParameter(sCgGiProgram, "maxDepth");
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334 | sExpFactorGiParam = cgGetNamedParameter(sCgGiProgram, "expFactor");
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335 |
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336 | sSamplesGiParam = cgGetNamedParameter(sCgGiProgram, "samples");
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337 |
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338 | sOldSsaoTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldSsaoTex");
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339 | sOldIllumTexGiParam = cgGetNamedParameter(sCgGiProgram, "oldIllumTex");
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340 |
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341 | // generate samples for ssao kernel
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342 | //GenerateSamples();
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343 | //cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
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344 |
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345 | cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
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346 | }
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347 | else
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348 | cerr << "globillum program failed to load" << endl;
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349 |
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350 | sCgCombinedIllumProgram =
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351 | cgCreateProgramFromFile(context,
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352 | CG_SOURCE,
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353 | "src/shaders/globillum.cg",
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354 | RenderState::sCgFragmentProfile,
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355 | "combine",
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356 | NULL);
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357 |
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358 | if (sCgCombinedIllumProgram != NULL)
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359 | {
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360 | cgGLLoadProgram(sCgCombinedIllumProgram);
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361 |
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362 | sColorsTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "colors");
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363 | sSsaoTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "ssaoTex");
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364 | sIllumTexCombinedIllumParam = cgGetNamedParameter(sCgCombinedIllumProgram, "illumTex");
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365 | }
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366 | else
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367 | cerr << "combined illum program failed to load" << endl;
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368 |
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369 |
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370 | sCgCombinedSsaoProgram =
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371 | cgCreateProgramFromFile(context,
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372 | CG_SOURCE,
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373 | "src/shaders/ssao.cg",
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374 | RenderState::sCgFragmentProfile,
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375 | "combine",
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376 | NULL);
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377 |
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378 | if (sCgCombinedSsaoProgram != NULL)
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379 | {
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380 | cgGLLoadProgram(sCgCombinedSsaoProgram);
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381 |
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382 | sColorsTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "colors");
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383 | sSsaoTexCombinedSsaoParam = cgGetNamedParameter(sCgCombinedSsaoProgram, "ssaoTex");
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384 | }
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385 | else
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386 | cerr << "combied illum program failed to load" << endl;
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387 |
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388 |
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389 | sCgAntiAliasingProgram =
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390 | cgCreateProgramFromFile(context,
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391 | CG_SOURCE,
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392 | "src/shaders/antialiasing.cg",
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393 | RenderState::sCgFragmentProfile,
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394 | "main",
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395 | NULL);
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396 |
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397 | if (sCgAntiAliasingProgram != NULL)
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398 | {
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399 | cgGLLoadProgram(sCgAntiAliasingProgram);
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400 |
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401 | sColorsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "colors");
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402 | sNormalsTexAntiAliasingParam = cgGetNamedParameter(sCgAntiAliasingProgram, "normals");
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403 | }
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404 | else
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405 | cerr << "antialiasing program failed to load" << endl;
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406 |
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407 | PrintGLerror("init");
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408 | }
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409 |
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410 |
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411 | void SsaoShader::Render(FrameBufferObject *fbo,
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412 | const Matrix4x4 &oldProjViewMatrix,
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413 | float expFactor)
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414 | {
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415 |
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416 | // switch roles of old and new fbo
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417 | // the algorihm uses two input fbos, where the one
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418 | // contais the color buffer from the last frame,
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419 | // the other one will be written
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420 | swap(mNewFbo, mOldFbo);
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421 |
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422 | FrameBufferObject::Release();
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423 |
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424 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
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425 |
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426 | glDisable(GL_ALPHA_TEST);
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427 | glDisable(GL_TEXTURE_2D);
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428 | glDisable(GL_LIGHTING);
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429 |
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430 | glPushAttrib(GL_VIEWPORT_BIT);
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431 | glViewport(0, 0, mWidth, mHeight);
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432 |
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433 | glMatrixMode(GL_PROJECTION);
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434 | glPushMatrix();
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435 | glLoadIdentity();
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436 |
|
---|
437 | glMatrixMode(GL_MODELVIEW);
|
---|
438 | glPushMatrix();
|
---|
439 | glLoadIdentity();
|
---|
440 |
|
---|
441 | const float offs = 0.5f;
|
---|
442 | glOrtho(-offs, offs, -offs, offs, 0, 1);
|
---|
443 |
|
---|
444 | FirstPass(fbo);
|
---|
445 |
|
---|
446 | if (!mUseGlobIllum)
|
---|
447 | {
|
---|
448 | ComputeSsao(fbo, expFactor, oldProjViewMatrix);
|
---|
449 | CombineSsao(fbo);
|
---|
450 | }
|
---|
451 | else
|
---|
452 | {
|
---|
453 | ComputeGlobIllum(fbo, expFactor, oldProjViewMatrix);
|
---|
454 | CombineIllum(fbo);
|
---|
455 | }
|
---|
456 |
|
---|
457 | AntiAliasing(fbo);
|
---|
458 |
|
---|
459 | glEnable(GL_LIGHTING);
|
---|
460 | glDisable(GL_TEXTURE_2D);
|
---|
461 |
|
---|
462 | glMatrixMode(GL_PROJECTION);
|
---|
463 | glPopMatrix();
|
---|
464 |
|
---|
465 | glMatrixMode(GL_MODELVIEW);
|
---|
466 | glPopMatrix();
|
---|
467 |
|
---|
468 | glPopAttrib();
|
---|
469 |
|
---|
470 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
|
---|
471 | }
|
---|
472 |
|
---|
473 |
|
---|
474 | void SsaoShader::ComputeSsao(FrameBufferObject *fbo,
|
---|
475 | float expFactor,
|
---|
476 | const Matrix4x4 &oldProjViewMatrix
|
---|
477 | )
|
---|
478 | {
|
---|
479 | cgGLSetMatrixParameterfc(sOldModelViewProjMatrixParam, (const float *)oldProjViewMatrix.x);
|
---|
480 |
|
---|
481 | GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
|
---|
482 | GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
483 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
|
---|
484 |
|
---|
485 | if (1)
|
---|
486 | {
|
---|
487 | // generate mip map levels for position texture
|
---|
488 | glBindTexture(GL_TEXTURE_2D, positionsTex);
|
---|
489 | glGenerateMipmapEXT(GL_TEXTURE_2D);
|
---|
490 | }
|
---|
491 |
|
---|
492 |
|
---|
493 | // read the second buffer, write to the first buffer
|
---|
494 | mNewFbo->Bind();
|
---|
495 | glDrawBuffers(1, mymrt);
|
---|
496 |
|
---|
497 |
|
---|
498 | GLuint oldTex = mOldFbo->GetColorBuffer(0)->GetTexture();
|
---|
499 |
|
---|
500 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
501 |
|
---|
502 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
503 | cgGLBindProgram(sCgSsaoProgram);
|
---|
504 |
|
---|
505 | cgGLSetTextureParameter(sPositionsTexParam, positionsTex);
|
---|
506 | cgGLEnableTextureParameter(sPositionsTexParam);
|
---|
507 |
|
---|
508 | cgGLSetTextureParameter(sColorsTexParam, colorsTex);
|
---|
509 | cgGLEnableTextureParameter(sColorsTexParam);
|
---|
510 |
|
---|
511 | cgGLSetTextureParameter(sNormalsTexParam, normalsTex);
|
---|
512 | cgGLEnableTextureParameter(sNormalsTexParam);
|
---|
513 |
|
---|
514 | cgGLSetTextureParameter(sNoiseTexParam, noiseTex);
|
---|
515 | cgGLEnableTextureParameter(sNoiseTexParam);
|
---|
516 |
|
---|
517 | cgGLSetTextureParameter(sOldTexParam, oldTex);
|
---|
518 | cgGLEnableTextureParameter(sOldTexParam);
|
---|
519 |
|
---|
520 | cgGLSetParameter1f(sMaxDepthParam, mScaleFactor);
|
---|
521 |
|
---|
522 | if (mUseTemporalCoherence)
|
---|
523 | {
|
---|
524 | cgGLSetParameter1f(sNoiseMultiplierParam, RandomValue(3.0f, 17.0f));
|
---|
525 | cgGLSetParameter1f(sExpFactorParam, expFactor);
|
---|
526 |
|
---|
527 |
|
---|
528 | // q: should we generate new samples or only rotate the old ones?
|
---|
529 | // in the first case, the sample patterns look nicer, but the kernel
|
---|
530 | // needs longer to converge
|
---|
531 | GenerateSamples(mSampling);
|
---|
532 | cgGLSetParameterArray2f(sSamplesParam, 0, NUM_SAMPLES, (const float *)samples);
|
---|
533 | }
|
---|
534 | else
|
---|
535 | {
|
---|
536 | cgGLSetParameter1f(sExpFactorParam, 1.0f);
|
---|
537 | }
|
---|
538 |
|
---|
539 | Vector3 tl, tr, bl, br;
|
---|
540 | ComputeViewVectors(tl, tr, bl, br);
|
---|
541 |
|
---|
542 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
543 |
|
---|
544 | glBegin(GL_QUADS);
|
---|
545 |
|
---|
546 | // note: slightly larger texture hides ambient occlusion error on border but costs resolution
|
---|
547 | //const float new_offs = 0.55f;
|
---|
548 | const float new_offs = 0.5f;
|
---|
549 |
|
---|
550 | glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
|
---|
551 | glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
|
---|
552 | glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
|
---|
553 | glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
|
---|
554 |
|
---|
555 | glEnd();
|
---|
556 |
|
---|
557 | cgGLDisableTextureParameter(sColorsTexParam);
|
---|
558 | cgGLDisableTextureParameter(sPositionsTexParam);
|
---|
559 | cgGLDisableTextureParameter(sNormalsTexParam);
|
---|
560 | cgGLDisableTextureParameter(sNoiseTexParam);
|
---|
561 | cgGLDisableTextureParameter(sOldTexParam);
|
---|
562 |
|
---|
563 |
|
---|
564 | FrameBufferObject::Release();
|
---|
565 |
|
---|
566 | PrintGLerror("ssao first pass");
|
---|
567 | }
|
---|
568 |
|
---|
569 |
|
---|
570 | void SsaoShader::ComputeViewVectors(Vector3 &tl, Vector3 &tr, Vector3 &bl, Vector3 &br)
|
---|
571 | {
|
---|
572 | Vector3 ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr;
|
---|
573 |
|
---|
574 | mCamera->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
|
---|
575 |
|
---|
576 | #if 1 // matT: debug this!!
|
---|
577 |
|
---|
578 | bl = -Normalize(nbl - fbl);
|
---|
579 | br = -Normalize(nbr - fbr);
|
---|
580 | tl = -Normalize(ntl - ftl);
|
---|
581 | tr = -Normalize(ntr - ftr);
|
---|
582 |
|
---|
583 | #else // just take camera direction
|
---|
584 |
|
---|
585 | bl = -Normalize(mCamera->GetDirection());
|
---|
586 | br = -Normalize(mCamera->GetDirection());
|
---|
587 | tl = -Normalize(mCamera->GetDirection());
|
---|
588 | tr = -Normalize(mCamera->GetDirection());
|
---|
589 |
|
---|
590 | #endif
|
---|
591 |
|
---|
592 | // normalize to 0 .. 1
|
---|
593 | bl = bl * 0.5f + 0.5f;
|
---|
594 | br = br * 0.5f + 0.5f;
|
---|
595 | tl = tl * 0.5f + 0.5f;
|
---|
596 | tr = tr * 0.5f + 0.5f;
|
---|
597 | }
|
---|
598 |
|
---|
599 |
|
---|
600 |
|
---|
601 | static void SetVertex(float x, float y, float x_offs, float y_offs)
|
---|
602 | {
|
---|
603 | glMultiTexCoord2fARB(GL_TEXTURE0_ARB, x, y); // center
|
---|
604 | glMultiTexCoord2fARB(GL_TEXTURE1_ARB, x - x_offs, y + y_offs); // left top
|
---|
605 | glMultiTexCoord2fARB(GL_TEXTURE2_ARB, x + x_offs, y - y_offs); // right bottom
|
---|
606 | glMultiTexCoord2fARB(GL_TEXTURE3_ARB, x + x_offs, y + y_offs); // right top
|
---|
607 | glMultiTexCoord2fARB(GL_TEXTURE4_ARB, x - x_offs, y - y_offs); // left bottom
|
---|
608 |
|
---|
609 | glMultiTexCoord4fARB(GL_TEXTURE5_ARB, x - x_offs, y, x + x_offs, y); // left right
|
---|
610 | glMultiTexCoord4fARB(GL_TEXTURE6_ARB, x, y + y_offs, x, y - y_offs); // top bottom
|
---|
611 |
|
---|
612 | glVertex3f(x - 0.5f, y - 0.5f, -0.5f);
|
---|
613 | }
|
---|
614 |
|
---|
615 |
|
---|
616 | void SsaoShader::AntiAliasing(FrameBufferObject *fbo)
|
---|
617 | {
|
---|
618 | GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
|
---|
619 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
|
---|
620 |
|
---|
621 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
622 |
|
---|
623 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
624 | cgGLBindProgram(sCgAntiAliasingProgram);
|
---|
625 |
|
---|
626 | cgGLSetTextureParameter(sColorsTexAntiAliasingParam, colorsTex);
|
---|
627 | cgGLEnableTextureParameter(sColorsTexAntiAliasingParam);
|
---|
628 |
|
---|
629 | cgGLSetTextureParameter(sNormalsTexAntiAliasingParam, normalsTex);
|
---|
630 | cgGLEnableTextureParameter(sNormalsTexAntiAliasingParam);
|
---|
631 |
|
---|
632 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
633 |
|
---|
634 | float offs2 = 0.5f;
|
---|
635 |
|
---|
636 | glBegin(GL_QUADS);
|
---|
637 |
|
---|
638 | // the neighbouring texels
|
---|
639 | float x_offs = 1.0f / mWidth;
|
---|
640 | float y_offs = 1.0f / mHeight;
|
---|
641 |
|
---|
642 | SetVertex(0, 0, x_offs, y_offs);
|
---|
643 | SetVertex(1, 0, x_offs, y_offs);
|
---|
644 | SetVertex(1, 1, x_offs, y_offs);
|
---|
645 | SetVertex(0, 1, x_offs, y_offs);
|
---|
646 |
|
---|
647 | glEnd();
|
---|
648 |
|
---|
649 | cgGLDisableTextureParameter(sColorsTexAntiAliasingParam);
|
---|
650 | cgGLDisableTextureParameter(sNormalsTexAntiAliasingParam);
|
---|
651 |
|
---|
652 | PrintGLerror("antialiasing");
|
---|
653 | }
|
---|
654 |
|
---|
655 |
|
---|
656 | void SsaoShader::FirstPass(FrameBufferObject *fbo)
|
---|
657 | {
|
---|
658 | GLuint colorsTex = fbo->GetColorBuffer(0)->GetTexture();
|
---|
659 | GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
660 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
|
---|
661 |
|
---|
662 | fbo->Bind();
|
---|
663 |
|
---|
664 | glDrawBuffers(1, mymrt + 3);
|
---|
665 |
|
---|
666 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
667 |
|
---|
668 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
669 |
|
---|
670 | cgGLBindProgram(sCgDeferredProgram);
|
---|
671 |
|
---|
672 | cgGLSetTextureParameter(sColorsTexDeferredParam, colorsTex);
|
---|
673 | cgGLEnableTextureParameter(sColorsTexDeferredParam);
|
---|
674 |
|
---|
675 | cgGLSetTextureParameter(sPositionsTexDeferredParam, positionsTex);
|
---|
676 | cgGLEnableTextureParameter(sPositionsTexDeferredParam);
|
---|
677 |
|
---|
678 | cgGLSetTextureParameter(sNormalsTexDeferredParam, normalsTex);
|
---|
679 | cgGLEnableTextureParameter(sNormalsTexDeferredParam);
|
---|
680 |
|
---|
681 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
682 |
|
---|
683 | const float offs = 0.5f;
|
---|
684 |
|
---|
685 | glBegin(GL_QUADS);
|
---|
686 |
|
---|
687 | glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
|
---|
688 | glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
|
---|
689 | glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
|
---|
690 | glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
|
---|
691 |
|
---|
692 | glEnd();
|
---|
693 |
|
---|
694 | cgGLDisableTextureParameter(sColorsTexDeferredParam);
|
---|
695 | cgGLDisableTextureParameter(sPositionsTexDeferredParam);
|
---|
696 | cgGLDisableTextureParameter(sNormalsTexDeferredParam);
|
---|
697 |
|
---|
698 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
|
---|
699 |
|
---|
700 | FrameBufferObject::Release();
|
---|
701 |
|
---|
702 | PrintGLerror("deferred shading");
|
---|
703 | }
|
---|
704 |
|
---|
705 |
|
---|
706 | void SsaoShader::ComputeGlobIllum(FrameBufferObject *fbo,
|
---|
707 | float expFactor,
|
---|
708 | const Matrix4x4 &oldProjViewMatrix
|
---|
709 | )
|
---|
710 | {
|
---|
711 | cgGLSetMatrixParameterfc(sOldModelViewProjMatrixGiParam, (const float *)oldProjViewMatrix.x);
|
---|
712 |
|
---|
713 | //GLuint colorsTex = mFbo->GetColorBuffer(0)->GetTexture();
|
---|
714 | GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
|
---|
715 | GLuint positionsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
716 | GLuint normalsTex = fbo->GetColorBuffer(2)->GetTexture();
|
---|
717 |
|
---|
718 | if (1)
|
---|
719 | {
|
---|
720 | // generate mip map levels for position texture
|
---|
721 | glBindTexture(GL_TEXTURE_2D, positionsTex);
|
---|
722 | glGenerateMipmapEXT(GL_TEXTURE_2D);
|
---|
723 |
|
---|
724 | // generate mip map levels for position texture
|
---|
725 | glBindTexture(GL_TEXTURE_2D, colorsTex);
|
---|
726 | glGenerateMipmapEXT(GL_TEXTURE_2D);
|
---|
727 | }
|
---|
728 |
|
---|
729 |
|
---|
730 | // read the second buffer, write to the first buffer
|
---|
731 | mNewFbo->Bind();
|
---|
732 | glDrawBuffers(2, mymrt);
|
---|
733 |
|
---|
734 | GLuint oldSsaoTex = mOldFbo->GetColorBuffer(0)->GetTexture();
|
---|
735 | GLuint oldIllumTex = mOldFbo->GetColorBuffer(1)->GetTexture();
|
---|
736 |
|
---|
737 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
738 |
|
---|
739 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
740 | cgGLBindProgram(sCgGiProgram);
|
---|
741 |
|
---|
742 | cgGLSetTextureParameter(sPositionsTexGiParam, positionsTex);
|
---|
743 | cgGLEnableTextureParameter(sPositionsTexGiParam);
|
---|
744 |
|
---|
745 | cgGLSetTextureParameter(sColorsTexGiParam, colorsTex);
|
---|
746 | cgGLEnableTextureParameter(sColorsTexGiParam);
|
---|
747 |
|
---|
748 | cgGLSetTextureParameter(sNormalsTexGiParam, normalsTex);
|
---|
749 | cgGLEnableTextureParameter(sNormalsTexGiParam);
|
---|
750 |
|
---|
751 | cgGLSetTextureParameter(sNoiseTexGiParam, noiseTex);
|
---|
752 | cgGLEnableTextureParameter(sNoiseTexGiParam);
|
---|
753 |
|
---|
754 | cgGLSetTextureParameter(sOldSsaoTexGiParam, oldSsaoTex);
|
---|
755 | cgGLEnableTextureParameter(sOldSsaoTexGiParam);
|
---|
756 |
|
---|
757 | cgGLSetTextureParameter(sOldIllumTexGiParam, oldIllumTex);
|
---|
758 | cgGLEnableTextureParameter(sOldIllumTexGiParam);
|
---|
759 |
|
---|
760 | cgGLSetParameter1f(sMaxDepthGiParam, mScaleFactor);
|
---|
761 |
|
---|
762 |
|
---|
763 | if (mUseTemporalCoherence)
|
---|
764 | {
|
---|
765 | cgGLSetParameter1f(sNoiseMultiplierGiParam, RandomValue(3.0f, 17.0f));
|
---|
766 | cgGLSetParameter1f(sExpFactorGiParam, expFactor);
|
---|
767 |
|
---|
768 | // q: should we generate new samples or only rotate the old ones?
|
---|
769 | // in the first case, the sample patterns look nicer, but the kernel
|
---|
770 | // needs longer to converge
|
---|
771 | GenerateSamples(mSampling);
|
---|
772 | cgGLSetParameterArray2f(sSamplesGiParam, 0, NUM_SAMPLES, (const float *)samples);
|
---|
773 | }
|
---|
774 | else
|
---|
775 | {
|
---|
776 | cgGLSetParameter1f(sExpFactorGiParam, 1.0f);
|
---|
777 | }
|
---|
778 |
|
---|
779 | Vector3 tl, tr, bl, br;
|
---|
780 | ComputeViewVectors(tl, tr, bl, br);
|
---|
781 |
|
---|
782 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
783 |
|
---|
784 | glBegin(GL_QUADS);
|
---|
785 |
|
---|
786 | // note: slightly larger texture hides ambient occlusion error on border but costs resolution
|
---|
787 | //const float new_offs = 0.55f;
|
---|
788 | const float new_offs = 0.5f;
|
---|
789 |
|
---|
790 | glColor3f(bl.x, bl.y, bl.z); glTexCoord2f(0, 0); glVertex3f(-new_offs, -new_offs, -0.5f);
|
---|
791 | glColor3f(br.x, br.y, br.z); glTexCoord2f(1, 0); glVertex3f( new_offs, -new_offs, -0.5f);
|
---|
792 | glColor3f(tr.x, tr.y, tr.z); glTexCoord2f(1, 1); glVertex3f( new_offs, new_offs, -0.5f);
|
---|
793 | glColor3f(tl.x, tl.y, tl.z); glTexCoord2f(0, 1); glVertex3f(-new_offs, new_offs, -0.5f);
|
---|
794 |
|
---|
795 | glEnd();
|
---|
796 |
|
---|
797 | cgGLDisableTextureParameter(sColorsTexGiParam);
|
---|
798 | cgGLDisableTextureParameter(sPositionsTexGiParam);
|
---|
799 | cgGLDisableTextureParameter(sNormalsTexGiParam);
|
---|
800 | cgGLDisableTextureParameter(sNoiseTexGiParam);
|
---|
801 | cgGLDisableTextureParameter(sOldSsaoTexGiParam);
|
---|
802 | cgGLDisableTextureParameter(sOldIllumTexGiParam);
|
---|
803 |
|
---|
804 | FrameBufferObject::Release();
|
---|
805 |
|
---|
806 | PrintGLerror("globillum first pass");
|
---|
807 | }
|
---|
808 |
|
---|
809 |
|
---|
810 | void SsaoShader::CombineIllum(FrameBufferObject *fbo)
|
---|
811 | {
|
---|
812 | GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
|
---|
813 |
|
---|
814 | GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
|
---|
815 | GLuint illumTex = mNewFbo->GetColorBuffer(1)->GetTexture();
|
---|
816 |
|
---|
817 | fbo->Bind();
|
---|
818 |
|
---|
819 | // overwrite old color texture
|
---|
820 | glDrawBuffers(1, mymrt);
|
---|
821 |
|
---|
822 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
823 |
|
---|
824 | cgGLBindProgram(sCgCombinedIllumProgram);
|
---|
825 |
|
---|
826 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
827 |
|
---|
828 |
|
---|
829 | cgGLSetTextureParameter(sColorsTexCombinedIllumParam, colorsTex);
|
---|
830 | cgGLEnableTextureParameter(sColorsTexCombinedIllumParam);
|
---|
831 |
|
---|
832 | cgGLSetTextureParameter(sSsaoTexCombinedIllumParam, ssaoTex);
|
---|
833 | cgGLEnableTextureParameter(sSsaoTexCombinedIllumParam);
|
---|
834 |
|
---|
835 | cgGLSetTextureParameter(sIllumTexCombinedIllumParam, illumTex);
|
---|
836 | cgGLEnableTextureParameter(sIllumTexCombinedIllumParam);
|
---|
837 |
|
---|
838 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
839 |
|
---|
840 | const float offs = 0.5f;
|
---|
841 |
|
---|
842 | glBegin(GL_QUADS);
|
---|
843 |
|
---|
844 | glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
|
---|
845 | glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
|
---|
846 | glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
|
---|
847 | glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
|
---|
848 |
|
---|
849 | glEnd();
|
---|
850 |
|
---|
851 | cgGLDisableTextureParameter(sColorsTexCombinedIllumParam);
|
---|
852 | cgGLDisableTextureParameter(sSsaoTexCombinedIllumParam);
|
---|
853 | cgGLDisableTextureParameter(sIllumTexCombinedIllumParam);
|
---|
854 |
|
---|
855 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
|
---|
856 |
|
---|
857 | FrameBufferObject::Release();
|
---|
858 |
|
---|
859 | PrintGLerror("combine");
|
---|
860 | }
|
---|
861 |
|
---|
862 |
|
---|
863 | void SsaoShader::CombineSsao(FrameBufferObject *fbo)
|
---|
864 | {
|
---|
865 | GLuint colorsTex = fbo->GetColorBuffer(3)->GetTexture();
|
---|
866 | GLuint ssaoTex = mNewFbo->GetColorBuffer(0)->GetTexture();
|
---|
867 |
|
---|
868 | fbo->Bind();
|
---|
869 |
|
---|
870 | // write into old color texture (not needed anymore)
|
---|
871 | glDrawBuffers(1, mymrt);
|
---|
872 |
|
---|
873 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
---|
874 |
|
---|
875 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
|
---|
876 |
|
---|
877 | cgGLBindProgram(sCgCombinedSsaoProgram);
|
---|
878 |
|
---|
879 | cgGLSetTextureParameter(sColorsTexCombinedSsaoParam, colorsTex);
|
---|
880 | cgGLEnableTextureParameter(sColorsTexCombinedSsaoParam);
|
---|
881 |
|
---|
882 | cgGLSetTextureParameter(sSsaoTexCombinedSsaoParam, ssaoTex);
|
---|
883 | cgGLEnableTextureParameter(sSsaoTexCombinedSsaoParam);
|
---|
884 |
|
---|
885 |
|
---|
886 | glColor3f(1.0f, 1.0f, 1.0f);
|
---|
887 |
|
---|
888 | const float offs = 0.5f;
|
---|
889 |
|
---|
890 | glBegin(GL_QUADS);
|
---|
891 |
|
---|
892 | glTexCoord2f(0, 0); glVertex3f(-offs, -offs, -0.5f);
|
---|
893 | glTexCoord2f(1, 0); glVertex3f( offs, -offs, -0.5f);
|
---|
894 | glTexCoord2f(1, 1); glVertex3f( offs, offs, -0.5f);
|
---|
895 | glTexCoord2f(0, 1); glVertex3f(-offs, offs, -0.5f);
|
---|
896 |
|
---|
897 | glEnd();
|
---|
898 |
|
---|
899 | cgGLDisableTextureParameter(sColorsTexCombinedSsaoParam);
|
---|
900 | cgGLDisableTextureParameter(sSsaoTexCombinedSsaoParam);
|
---|
901 |
|
---|
902 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
|
---|
903 |
|
---|
904 | FrameBufferObject::Release();
|
---|
905 |
|
---|
906 | PrintGLerror("combine ssao");
|
---|
907 | }
|
---|
908 |
|
---|
909 |
|
---|
910 |
|
---|
911 | } // namespace
|
---|