1 | #include "DeferredRenderer.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 "Halton.h"
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9 | #include "ShadowMapping.h"
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10 | #include "Light.h"
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11 | #include "ShaderManager.h"
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12 | #include "Texture.h"
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13 |
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14 | #include <math.h>
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15 |
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16 | #include <IL/il.h>
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17 | #include <assert.h>
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18 |
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19 |
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20 | #ifdef _CRT_SET
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21 | #define _CRTDBG_MAP_ALLOC
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22 | #include <stdlib.h>
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23 | #include <crtdbg.h>
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24 |
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25 | // redefine new operator
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26 | #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
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27 | #define new DEBUG_NEW
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28 | #endif
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29 |
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30 |
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31 | using namespace std;
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32 |
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33 |
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34 | static void startil()
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35 | {
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36 | ilInit();
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37 | assert(ilGetError() == IL_NO_ERROR);
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38 | }
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39 |
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40 |
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41 | static void stopil()
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42 | {
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43 | ilShutDown();
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44 | assert(ilGetError() == IL_NO_ERROR);
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45 | }
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46 |
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47 |
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48 | namespace CHCDemoEngine
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49 | {
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50 |
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51 | static ShaderProgram *sCgSsaoProgram = NULL;
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52 | static ShaderProgram *sCgGiProgram = NULL;
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53 |
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54 | static ShaderProgram *sCgDeferredProgram = NULL;
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55 | static ShaderProgram *sCgAntiAliasingProgram = NULL;
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56 | static ShaderProgram *sCgDeferredShadowProgram = NULL;
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57 |
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58 | static ShaderProgram *sCgCombineSsaoProgram = NULL;
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59 | static ShaderProgram *sCgCombineIllumProgram = NULL;
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60 | static ShaderProgram *sCgLogLumProgram = NULL;
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61 | static ShaderProgram *sCgToneProgram = NULL;
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62 | static ShaderProgram *sCgDownSampleProgram = NULL;
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63 | static ShaderProgram *sCgScaleDepthProgram = NULL;
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64 | static ShaderProgram *sCgPrepareSsaoProgram = NULL;
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65 | static ShaderProgram *sCgLenseFlareProgram = NULL;
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66 |
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67 |
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68 | static GLuint noiseTex2D = 0;
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69 | static GLuint noiseTex1D = 0;
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70 |
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71 |
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72 | // ssao random spherical samples
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73 | static Sample2 samples2[NUM_SAMPLES];
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74 | // number of pcf tabs
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75 | static Sample2 pcfSamples[NUM_PCF_TABS];
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76 |
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77 |
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78 | static float ssaoFilterOffsets[NUM_SSAO_FILTER_SAMPLES * 2];
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79 | static float ssaoFilterWeights[NUM_SSAO_FILTER_SAMPLES];
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80 |
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81 | static Texture *sHaloTex[5];
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82 |
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83 | int DeferredRenderer::colorBufferIdx = 0;
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84 |
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85 |
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86 |
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87 |
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88 | /** Helper method that computes the view vectors in the corners of the current view frustum.
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89 | */
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90 | static void ComputeViewVectors(PerspectiveCamera *cam, Vector3 &bl, Vector3 &br, Vector3 &tl, Vector3 &tr)
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91 | {
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92 | Vector3 ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr;
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93 | cam->ComputePoints(ftl, ftr, fbl, fbr, ntl, ntr, nbl, nbr);
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94 |
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95 | bl = Normalize(nbl - fbl);
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96 | br = Normalize(nbr - fbr);
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97 | tl = Normalize(ntl - ftl);
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98 | tr = Normalize(ntr - ftr);
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99 | }
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100 |
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101 |
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102 | static float GaussianDistribution(float x, float y, float rho)
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103 | {
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104 | float g = 1.0f / sqrtf(2.0f * M_PI * rho * rho);
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105 | g *= expf( -(x * x + y * y) / (2.0f * rho * rho));
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106 |
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107 | return g;
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108 | }
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109 |
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110 |
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111 | static void PrintGLerror(char *msg)
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112 | {
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113 | GLenum errCode;
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114 | const GLubyte *errStr;
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115 |
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116 | if ((errCode = glGetError()) != GL_NO_ERROR)
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117 | {
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118 | errStr = gluErrorString(errCode);
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119 | fprintf(stderr,"OpenGL ERROR: %s: %s\n", errStr, msg);
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120 | }
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121 | }
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122 |
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123 |
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124 | static Sample2 UnitTest(float x, float y, int wi, int he)
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125 | {
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126 | Sample2 s;
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127 |
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128 | s.x = float(floor(x * (float)wi - 0.5f) + 1.0f) / (float)wi;
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129 | s.y = float(floor(y * (float)he - 0.5f) + 1.0f) / (float)he;
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130 |
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131 | return s;
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132 | }
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133 |
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134 |
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135 | static void ComputeSampleOffsets(float *sampleOffsets,
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136 | int imageW, int imageH,
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137 | float width,
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138 | int samples)
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139 | {
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140 | const float xoffs = width / (float)imageW;
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141 | const float yoffs = width / (float)imageH;
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142 |
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143 | const int numSamples = (int)sqrt((float)samples);
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144 | const int startSamples = -numSamples / 2;
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145 | const int endSamples = numSamples + startSamples - 1;
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146 | //cout << startSamples << " " << endSamples << endl;
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147 |
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148 | int idx = 0;
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149 |
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150 | for (int x = startSamples; x <= endSamples; ++ x)
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151 | {
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152 | for (int y = startSamples; y <= endSamples; ++ y)
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153 | {
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154 | sampleOffsets[idx + 0] = (float)x * xoffs;
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155 | sampleOffsets[idx + 1] = (float)y * yoffs;
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156 | idx += 2;
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157 | }
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158 | }
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159 | }
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160 |
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161 |
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162 | void DeferredRenderer::FlipFbos(FrameBufferObject *fbo)
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163 | {
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164 | fbo->Bind();
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165 | colorBufferIdx = 3 - colorBufferIdx;
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166 | glDrawBuffers(1, mrt + colorBufferIdx);
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167 | }
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168 |
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169 |
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170 | void DeferredRenderer::DrawQuad(ShaderProgram *p)
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171 | {
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172 | if (p) p->Bind();
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173 |
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174 | // interpolate the view vector
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175 | Vector3 bl = mCornersView[0];
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176 | Vector3 br = mCornersView[1];
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177 | Vector3 tl = mCornersView[2];
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178 | Vector3 tr = mCornersView[3];
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179 |
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180 | // note: slightly larger texture could hide ambient occlusion error on border but costs resolution
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181 | glBegin(GL_QUADS);
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182 |
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183 | glTexCoord2f(0, 0); glMultiTexCoord3fARB(GL_TEXTURE1_ARB, bl.x, bl.y, bl.z); glVertex2f( .0f, .0f);
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184 | glTexCoord2f(1, 0); glMultiTexCoord3fARB(GL_TEXTURE1_ARB, br.x, br.y, br.z); glVertex2f(1.0f, .0f);
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185 | glTexCoord2f(1, 1); glMultiTexCoord3fARB(GL_TEXTURE1_ARB, tr.x, tr.y, tr.z); glVertex2f(1.0f, 1.0f);
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186 | glTexCoord2f(0, 1); glMultiTexCoord3fARB(GL_TEXTURE1_ARB, tl.x, tl.y, tl.z); glVertex2f( .0f, 1.0f);
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187 |
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188 | glEnd();
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189 | }
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190 |
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191 |
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192 | /** Generate poisson disc distributed sample points on the unit disc
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193 | */
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194 | static void GenerateSamples(int sampling)
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195 | {
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196 | switch (sampling)
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197 | {
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198 | case DeferredRenderer::SAMPLING_POISSON:
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199 | {
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200 | static PoissonDiscSampleGenerator2D poisson(NUM_SAMPLES, 1.0f);
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201 | poisson.Generate((float *)samples2);
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202 | }
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203 | break;
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204 | case DeferredRenderer::SAMPLING_QUADRATIC:
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205 | {
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206 | static QuadraticDiscSampleGenerator2D g(NUM_SAMPLES, 1.0f);
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207 | g.Generate((float *)samples2);
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208 | }
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209 | break;
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210 | default: // SAMPLING_DEFAULT
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211 | {
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212 | static RandomSampleGenerator2D g(NUM_SAMPLES, 1.0f);
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213 | g.Generate((float *)samples2);
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214 | }
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215 | }
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216 | }
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217 |
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218 |
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219 | static void CreateNoiseTex2D(int w, int h)
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220 | {
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221 | //GLubyte *randomNormals = new GLubyte[mWidth * mHeight * 3];
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222 | Vector3 *randomNormals = new Vector3[w * h];
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223 |
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224 | for (int i = 0; i < w * h; ++ i)
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225 | {
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226 | // create random samples on a circle
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227 | const float r = RandomValue(0, 1);
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228 |
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229 | const float theta = 2.0f * acos(sqrt(1.0f - r));
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230 | //randomNormals[i] = Vector3(cos(theta), sin(theta), 0);
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231 | randomNormals[i] = Vector3(RandomValue(-M_PI, M_PI), 0, 0);
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232 | //Normalize(randomNormals[i]);
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233 | }
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234 |
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235 |
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236 | glEnable(GL_TEXTURE_2D);
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237 | glGenTextures(1, &noiseTex2D);
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238 | glBindTexture(GL_TEXTURE_2D, noiseTex2D);
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239 |
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240 | //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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241 | //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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242 |
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243 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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244 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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245 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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246 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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247 |
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248 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, w, h, 0, GL_RGB, GL_FLOAT, (float *)randomNormals);
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249 |
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250 | glBindTexture(GL_TEXTURE_2D, 0);
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251 | glDisable(GL_TEXTURE_2D);
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252 |
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253 | delete [] randomNormals;
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254 |
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255 | cout << "created noise texture" << endl;
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256 |
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257 | PrintGLerror("noisetexture");
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258 | }
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259 |
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260 |
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261 | static void PrepareLenseFlare()
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262 | {
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263 | string textures[] = {"flare4.tga", "lens2.jpg", "lens3.jpg", "lens4.jpg", "lens1.jpg"};
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264 |
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265 | for (int i = 0; i < 5; ++ i)
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266 | {
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267 | sHaloTex[i] = new Texture(model_path + textures[i]);
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268 |
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269 | sHaloTex[i]->SetBoundaryModeS(Texture::BORDER);
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270 | sHaloTex[i]->SetBoundaryModeT(Texture::BORDER);
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271 |
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272 | sHaloTex[i]->Create();
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273 | }
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274 |
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275 | cout << "prepared lense flare textures" << endl;
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276 |
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277 | PrintGLerror("prepare lense flare");
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278 | }
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279 |
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280 |
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281 | DeferredRenderer::DeferredRenderer(int w, int h,
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282 | PerspectiveCamera *cam,
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283 | bool ssaoUseFullResolution):
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284 | mWidth(w), mHeight(h),
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285 | mCamera(cam),
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286 | mUseTemporalCoherence(true),
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287 | mRegenerateSamples(true),
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288 | mSamplingMethod(SAMPLING_POISSON),
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289 | mShadingMethod(DEFAULT),
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290 | mIllumFboIndex(0),
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291 | mSortSamples(true),
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292 | mKernelRadius(1e-8f),
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293 | mSsaoFilterRadius(12.0f),
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294 | mSampleIntensity(0.2f),
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295 | mSunVisiblePixels(0),
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296 | mSavedFrameNumber(-1),
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297 | mSavedFrameSuffix("")
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298 | {
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299 | ///////////
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300 | //-- the flip-flop fbos
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301 |
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302 | int downSampledWidth, downSampledHeight;
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303 |
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304 | if (ssaoUseFullResolution)
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305 | {
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306 | downSampledWidth = w; downSampledHeight = h;
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307 | cout << "using full resolution ssao" << endl;
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308 | }
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309 | else
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310 | {
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311 | downSampledWidth = w / 2; downSampledHeight = h / 2;
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312 | cout << "using half resolution ssao" << endl;
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313 | }
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314 |
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315 | mIllumFbo = new FrameBufferObject(downSampledWidth, downSampledHeight, FrameBufferObject::DEPTH_NONE);
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316 | //mIllumFbo = new FrameBufferObject(w, h, FrameBufferObject::DEPTH_NONE);
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317 |
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318 | mFBOs.push_back(mIllumFbo);
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319 |
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320 | for (int i = 0; i < 4; ++ i)
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321 | {
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322 | mIllumFbo->AddColorBuffer(ColorBufferObject::RGBA_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR);
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323 | FrameBufferObject::InitBuffer(mIllumFbo, i);
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324 | }
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325 |
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326 |
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327 | ///////////////
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328 | //-- the downsampled ssao + color bleeding textures:
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329 | //-- as GI is mostly low frequency, we can use lower resolution toimprove performance
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330 |
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331 | mDownSampleFbo = new FrameBufferObject(downSampledWidth, downSampledHeight, FrameBufferObject::DEPTH_NONE);
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332 | // the downsampled color + depth buffer
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333 | mDownSampleFbo->AddColorBuffer(ColorBufferObject::RGBA_FLOAT_32, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR);
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334 | // downsample buffer for the normal texture
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335 | mDownSampleFbo->AddColorBuffer(ColorBufferObject::RGB_FLOAT_16, ColorBufferObject::WRAP_CLAMP_TO_EDGE, ColorBufferObject::FILTER_LINEAR);
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336 |
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337 |
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338 | for (int i = 0; i < 2; ++ i)
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339 | {
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340 | FrameBufferObject::InitBuffer(mDownSampleFbo, i);
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341 | }
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342 |
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343 | mFBOs.push_back(mDownSampleFbo);
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344 |
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345 | // create noise texture for ssao
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346 | // for performance reasons we use a smaller texture and repeat it over the screen
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347 | CreateNoiseTex2D(mIllumFbo->GetWidth() / 4, mIllumFbo->GetWidth() / 4);
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348 | //CreateNoiseTex2D(mIllumFbo->GetWidth(), mIllumFbo->GetWidth());
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349 |
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350 | mProjViewMatrix = IdentityMatrix();
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351 | mOldProjViewMatrix = IdentityMatrix();
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352 |
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353 | for (int i = 0; i < 4; ++ i)
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354 | {
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355 | mCornersView[i] = mOldCornersView[i] = Vector3::UNIT_X();
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356 | }
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357 |
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358 | mEyePos = mOldEyePos = Vector3::ZERO();
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359 |
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360 | PrepareLenseFlare();
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361 |
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362 | InitCg();
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363 | }
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364 |
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365 |
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366 | DeferredRenderer::~DeferredRenderer()
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367 | {
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368 | CLEAR_CONTAINER(mFBOs);
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369 |
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370 | glDeleteTextures(1, &noiseTex2D);
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371 | glDeleteTextures(1, &noiseTex1D);
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372 | }
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373 |
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374 |
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375 | void DeferredRenderer::InitCg()
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376 | {
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377 | ShaderManager *sm = ShaderManager::GetSingleton();
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378 |
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379 | sCgDeferredProgram = sm->CreateFragmentProgram("deferred", "main", "DeferredFrag");
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380 | sCgDeferredShadowProgram = sm->CreateFragmentProgram("deferred", "main_shadow", "DeferredFragShadow");
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381 | sCgSsaoProgram = sm->CreateFragmentProgram("ssao", "main", "SsaoFrag");
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382 | sCgGiProgram = sm->CreateFragmentProgram("globillum", "main", "GiFrag");
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383 | sCgCombineIllumProgram = sm->CreateFragmentProgram("globillum", "combine", "CombineGi");
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384 | sCgCombineSsaoProgram = sm->CreateFragmentProgram("combineSsao", "CombineSsaoHalfRes", "CombineSsao");
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385 | sCgAntiAliasingProgram = sm->CreateFragmentProgram("antialiasing", "main", "AntiAliasing");
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386 | sCgToneProgram = sm->CreateFragmentProgram("tonemap", "ToneMap", "ToneMap");
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387 | sCgDownSampleProgram = sm->CreateFragmentProgram("deferred", "Output", "Output");
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388 | sCgScaleDepthProgram = sm->CreateFragmentProgram("deferred", "ScaleDepth", "ScaleDepth");
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389 | sCgLogLumProgram = sm->CreateFragmentProgram("tonemap", "CalcAvgLogLum", "AvgLogLum");
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390 | sCgPrepareSsaoProgram = sm->CreateFragmentProgram("deferred", "PrepareSsao", "PrepareSsao");
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391 | sCgLenseFlareProgram = sm->CreateFragmentProgram("lenseFlare", "LenseFlare", "LenseFlare");
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392 |
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393 |
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394 | ///////////////////
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395 | //-- initialize program parameters
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396 |
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397 | string ssaoParams[] =
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398 | {"colors", "normals", "oldTex", "noiseTex", "temporalCoherence",
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399 | "samples", "bl", "br", "tl", "tr",
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400 | "modelViewProj", "oldModelViewProj", "oldEyePos", "oldbl", "oldbr",
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401 | "oldtl", "oldtr", "attribsTex", "kernelRadius", "sampleIntensity"};
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402 | sCgSsaoProgram->AddParameters(ssaoParams, 0, 20);
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403 |
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404 | string giParams[] =
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405 | {"colors", "normals", "noiseTex", "oldSsaoTex", "oldIllumTex",
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406 | "temporalCoherence", "samples", "bl", "br", "tl",
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407 | "tr", "oldModelViewProj", "modelViewProj"};
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408 | sCgGiProgram->AddParameters(giParams, 0, 13);
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409 |
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410 | string toneParams[] = {"colors", "imageKey", "whiteLum", "middleGrey"};
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411 | sCgToneProgram->AddParameters(toneParams, 0, 4);
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412 |
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413 |
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414 | ////////////////
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415 |
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416 | string deferredShadowParams[] =
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417 | {"colors", "normals", "shadowMap", "noiseTex", "shadowMatrix",
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418 | "sampleWidth", "lightDir", "eyePos", "samples", "weights"};
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419 |
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420 | sCgDeferredShadowProgram->AddParameters(deferredShadowParams, 0, 10);
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421 |
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422 | ////////////////
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423 |
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424 | string combineIllumParams[] = {"colorsTex", "ssaoTex", "illumTex"};
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425 | sCgCombineIllumProgram->AddParameters(combineIllumParams, 0, 3);
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426 |
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427 | ////////////////
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428 |
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429 | string combineSsaoParams[] =
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430 | {"colorsTex", "normalsTex", "ssaoTex", "filterOffs", "filterWeights",
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431 | "ssaoFilterRadius", "modelViewProj", "bl", "br", "tl",
|
---|
432 | "tr", "w", "h"};
|
---|
433 | sCgCombineSsaoProgram->AddParameters(combineSsaoParams, 0, 13);
|
---|
434 |
|
---|
435 | //////////////
|
---|
436 |
|
---|
437 | string deferredParams[] = {"colors", "normals", "lightDir"};
|
---|
438 | sCgDeferredProgram->AddParameters(deferredParams, 0, 3);
|
---|
439 |
|
---|
440 | ///////////////////
|
---|
441 |
|
---|
442 | string aaParams[] = {"colors", "normals", "offsets"};
|
---|
443 | sCgAntiAliasingProgram->AddParameters(aaParams, 0, 3);
|
---|
444 |
|
---|
445 | /////////////////////
|
---|
446 |
|
---|
447 | string downSampleParams[] = {"colors"};
|
---|
448 | sCgDownSampleProgram->AddParameters(downSampleParams, 0, 1);
|
---|
449 |
|
---|
450 | /////////////////////
|
---|
451 |
|
---|
452 | string scaleDepthParams[] = {"colors"};
|
---|
453 | sCgScaleDepthProgram->AddParameters(scaleDepthParams, 0, 1);
|
---|
454 |
|
---|
455 | ////////////
|
---|
456 |
|
---|
457 | sCgLogLumProgram->AddParameter("colors", 0);
|
---|
458 |
|
---|
459 | ////////////////
|
---|
460 |
|
---|
461 |
|
---|
462 | string prepareSsaoParams[] =
|
---|
463 | {"colorsTex", "normalsTex", "diffVals", "oldTex",
|
---|
464 | "oldEyePos", "modelViewProj", "oldModelViewProj",
|
---|
465 | "oldbl", "oldbr", "oldtl", "oldtr"};
|
---|
466 |
|
---|
467 | sCgPrepareSsaoProgram->AddParameters(prepareSsaoParams, 0, 11);
|
---|
468 |
|
---|
469 |
|
---|
470 | ////////////////
|
---|
471 |
|
---|
472 |
|
---|
473 | string lenseFlareParams[] =
|
---|
474 | {"colorsTex", "flareTex1", "flareTex2", "flareTex3", "flareTex4",
|
---|
475 | "flareTex5", "vectorToLight", "distanceToLight", "sunVisiblePixels"};
|
---|
476 |
|
---|
477 | sCgLenseFlareProgram->AddParameters(lenseFlareParams, 0, 9);
|
---|
478 |
|
---|
479 |
|
---|
480 | ////////////////
|
---|
481 | //-- prepare filters for ssao
|
---|
482 |
|
---|
483 | PrepareSsaoFilter();
|
---|
484 |
|
---|
485 |
|
---|
486 | /////////
|
---|
487 | //-- pcf tabs for shadowing
|
---|
488 |
|
---|
489 | float filterWeights[NUM_PCF_TABS];
|
---|
490 | PoissonDiscSampleGenerator2D poisson2(NUM_PCF_TABS, 1.0f);
|
---|
491 | poisson2.Generate((float *)pcfSamples);
|
---|
492 |
|
---|
493 | for (int i = 0; i < NUM_PCF_TABS; ++ i)
|
---|
494 | {
|
---|
495 | filterWeights[i] = GaussianDistribution(pcfSamples[i].x, pcfSamples[i].y, 1.0f);
|
---|
496 | }
|
---|
497 |
|
---|
498 | sCgDeferredShadowProgram->SetArray2f(8, (float *)pcfSamples, NUM_PCF_TABS);
|
---|
499 | sCgDeferredShadowProgram->SetArray1f(9, (float *)filterWeights, NUM_PCF_TABS);
|
---|
500 |
|
---|
501 | PrintGLerror("init");
|
---|
502 | }
|
---|
503 |
|
---|
504 |
|
---|
505 | void DeferredRenderer::Render(FrameBufferObject *fbo,
|
---|
506 | float tempCohFactor,
|
---|
507 | DirectionalLight *light,
|
---|
508 | bool useToneMapping,
|
---|
509 | bool useAntiAliasing,
|
---|
510 | ShadowMap *shadowMap
|
---|
511 | )
|
---|
512 | {
|
---|
513 | InitFrame();
|
---|
514 |
|
---|
515 | if (shadowMap)
|
---|
516 | FirstPassShadow(fbo, light, shadowMap);
|
---|
517 | else
|
---|
518 | FirstPass(fbo, light);
|
---|
519 |
|
---|
520 | if (mShadingMethod != 0)
|
---|
521 | {
|
---|
522 | PrepareSsao(fbo); // downsample fbo buffers
|
---|
523 | }
|
---|
524 |
|
---|
525 | // q: use antialiasing before or after ssao?
|
---|
526 | //if (useAntiAliasing) AntiAliasing(fbo, light);
|
---|
527 |
|
---|
528 | switch (mShadingMethod)
|
---|
529 | {
|
---|
530 | case SSAO:
|
---|
531 | ComputeSsao(fbo, tempCohFactor);
|
---|
532 | CombineSsao(fbo);
|
---|
533 | break;
|
---|
534 | case GI:
|
---|
535 | ComputeGlobIllum(fbo, tempCohFactor);
|
---|
536 | CombineIllum(fbo);
|
---|
537 | break;
|
---|
538 | default:
|
---|
539 | // do nothing: standard deferred shading
|
---|
540 | break;
|
---|
541 | }
|
---|
542 |
|
---|
543 | if (useToneMapping)
|
---|
544 | {
|
---|
545 | float imageKey, whiteLum, middleGrey;
|
---|
546 |
|
---|
547 | ComputeToneParameters(fbo, light, imageKey, whiteLum, middleGrey);
|
---|
548 | ToneMap(fbo, imageKey, whiteLum, middleGrey);
|
---|
549 | }
|
---|
550 |
|
---|
551 | /// compute lense flare
|
---|
552 | LenseFlare(fbo, light);
|
---|
553 |
|
---|
554 | const bool saveFrame = (mSavedFrameNumber != -1);
|
---|
555 | const bool displayAfterAA = !saveFrame;
|
---|
556 |
|
---|
557 | // multisampling is difficult / costly with deferred shading
|
---|
558 | // at least do some edge blurring
|
---|
559 | if (useAntiAliasing) AntiAliasing(fbo, light, displayAfterAA);
|
---|
560 |
|
---|
561 | /// store the current frame
|
---|
562 | if (saveFrame) SaveFrame(fbo);
|
---|
563 |
|
---|
564 | // if it hasn't been done yet => just output the latest buffer
|
---|
565 | if (!useAntiAliasing || !displayAfterAA)
|
---|
566 | Output(fbo);
|
---|
567 |
|
---|
568 | glEnable(GL_LIGHTING);
|
---|
569 | glDisable(GL_TEXTURE_2D);
|
---|
570 |
|
---|
571 | glMatrixMode(GL_PROJECTION);
|
---|
572 | glPopMatrix();
|
---|
573 |
|
---|
574 | glMatrixMode(GL_MODELVIEW);
|
---|
575 | glPopMatrix();
|
---|
576 |
|
---|
577 | // viewport
|
---|
578 | glPopAttrib();
|
---|
579 |
|
---|
580 | FrameBufferObject::Release();
|
---|
581 | ShaderManager::GetSingleton()->DisableFragmentProfile();
|
---|
582 | }
|
---|
583 |
|
---|
584 |
|
---|
585 | void DeferredRenderer::PrepareSsaoFilter()
|
---|
586 | {
|
---|
587 | const float filterWidth = 1.0f;
|
---|
588 |
|
---|
589 | PoissonDiscSampleGenerator2D poisson(NUM_SSAO_FILTER_SAMPLES, 1.0f);
|
---|
590 | poisson.Generate((float *)ssaoFilterOffsets);
|
---|
591 |
|
---|
592 | const float xoffs = (float)filterWidth / mWidth;
|
---|
593 | const float yoffs = (float)filterWidth / mHeight;
|
---|
594 |
|
---|
595 | for (int i = 0; i < NUM_SSAO_FILTER_SAMPLES; ++ i)
|
---|
596 | {
|
---|
597 | float x = ssaoFilterOffsets[2 * i + 0];
|
---|
598 | float y = ssaoFilterOffsets[2 * i + 1];
|
---|
599 |
|
---|
600 | ssaoFilterWeights[i] = GaussianDistribution(x, y, 1.0f);
|
---|
601 | //ssaoFilterWeights[i] = 1.0f;
|
---|
602 |
|
---|
603 | ssaoFilterOffsets[2 * i + 0] *= xoffs;
|
---|
604 | ssaoFilterOffsets[2 * i + 1] *= yoffs;
|
---|
605 | }
|
---|
606 | }
|
---|
607 |
|
---|
608 |
|
---|
609 | static inline float SqrMag(const Sample2 &s)
|
---|
610 | {
|
---|
611 | return (s.x * s.x + s.y * s.y);
|
---|
612 | }
|
---|
613 |
|
---|
614 |
|
---|
615 | static inline float SqrDist(const Sample2 &a, const Sample2 &b)
|
---|
616 | {
|
---|
617 | float x = a.x - b.x;
|
---|
618 | float y = a.y - b.y;
|
---|
619 |
|
---|
620 | return x * x + y * y;
|
---|
621 | }
|
---|
622 |
|
---|
623 |
|
---|
624 | static inline bool lt(const Sample2 &a, const Sample2 &b)
|
---|
625 | {
|
---|
626 | return SqrMag(a) < SqrMag(b);
|
---|
627 | }
|
---|
628 |
|
---|
629 |
|
---|
630 | void DeferredRenderer::SortSamples()
|
---|
631 | {
|
---|
632 | static Sample2 tempSamples[NUM_SAMPLES];
|
---|
633 | static bool checked[NUM_SAMPLES];
|
---|
634 |
|
---|
635 | for (int i = 0; i < NUM_SAMPLES; ++ i)
|
---|
636 | checked[i] = false;
|
---|
637 |
|
---|
638 | Sample2 currentSample;
|
---|
639 | currentSample.x = 0; currentSample.y = 0;
|
---|
640 | int ns = 0; // the next sample index
|
---|
641 |
|
---|
642 | for (int i = 0; i < NUM_SAMPLES; ++ i)
|
---|
643 | {
|
---|
644 | float minLen = 1e20f;
|
---|
645 |
|
---|
646 | for (int j = 0; j < NUM_SAMPLES; ++ j)
|
---|
647 | {
|
---|
648 | if (checked[j]) continue;
|
---|
649 |
|
---|
650 | Sample2 s = samples2[j];
|
---|
651 | const float len = SqrDist(s, currentSample);
|
---|
652 |
|
---|
653 | if (len < minLen)
|
---|
654 | {
|
---|
655 | minLen = len;
|
---|
656 | ns = j;
|
---|
657 | }
|
---|
658 | }
|
---|
659 |
|
---|
660 | tempSamples[i] = samples2[ns];
|
---|
661 | currentSample = samples2[ns];
|
---|
662 | checked[ns] = true;
|
---|
663 | }
|
---|
664 |
|
---|
665 | for (int i = 0; i < NUM_SAMPLES; ++ i)
|
---|
666 | samples2[i] = tempSamples[i];
|
---|
667 | }
|
---|
668 |
|
---|
669 |
|
---|
670 | void DeferredRenderer::ComputeSsao(FrameBufferObject *fbo, float tempCohFactor)
|
---|
671 | {
|
---|
672 | GLuint colorsTex, normalsTex, attribsTex;
|
---|
673 |
|
---|
674 | if (0)
|
---|
675 | {
|
---|
676 | colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
677 | normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
678 | }
|
---|
679 | else
|
---|
680 | {
|
---|
681 | normalsTex = mDownSampleFbo->GetColorBuffer(1)->GetTexture();
|
---|
682 | colorsTex = mDownSampleFbo->GetColorBuffer(0)->GetTexture();
|
---|
683 | }
|
---|
684 |
|
---|
685 | attribsTex = fbo->GetColorBuffer(2)->GetTexture();
|
---|
686 |
|
---|
687 | // flip flop between illumination buffers
|
---|
688 | GLuint oldTex = mIllumFbo->GetColorBuffer(2 - mIllumFboIndex)->GetTexture();
|
---|
689 |
|
---|
690 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
691 | glViewport(0, 0, mIllumFbo->GetWidth(), mIllumFbo->GetHeight());
|
---|
692 |
|
---|
693 | // read the second buffer, write to the first buffer
|
---|
694 | mIllumFbo->Bind();
|
---|
695 | glDrawBuffers(1, mrt + mIllumFboIndex);
|
---|
696 |
|
---|
697 | int i = 0;
|
---|
698 |
|
---|
699 | sCgSsaoProgram->SetTexture(i ++, colorsTex);
|
---|
700 | sCgSsaoProgram->SetTexture(i ++, normalsTex);
|
---|
701 | sCgSsaoProgram->SetTexture(i ++, oldTex);
|
---|
702 | sCgSsaoProgram->SetTexture(i ++, noiseTex2D);
|
---|
703 |
|
---|
704 | sCgSsaoProgram->SetValue1f(i ++, (mUseTemporalCoherence && !mRegenerateSamples) ? tempCohFactor : 0);
|
---|
705 |
|
---|
706 | if (mUseTemporalCoherence || mRegenerateSamples)
|
---|
707 | {
|
---|
708 | mRegenerateSamples = false;
|
---|
709 |
|
---|
710 | // q: should we generate new samples or only rotate the old ones?
|
---|
711 | // in the first case, the sample patterns look nicer, but the kernel
|
---|
712 | // needs longer to converge
|
---|
713 | GenerateSamples(mSamplingMethod);
|
---|
714 |
|
---|
715 | //if (mSortSamples) { SortSamples(); }
|
---|
716 | sCgSsaoProgram->SetArray2f(i, (float *)samples2, NUM_SAMPLES);
|
---|
717 | }
|
---|
718 |
|
---|
719 | ++ i;
|
---|
720 |
|
---|
721 | for (int j = 0; j < 4; ++ j, ++ i)
|
---|
722 | sCgSsaoProgram->SetValue3f(i, mCornersView[j].x, mCornersView[j].y, mCornersView[j].z);
|
---|
723 |
|
---|
724 | sCgSsaoProgram->SetMatrix(i ++, mProjViewMatrix);
|
---|
725 | sCgSsaoProgram->SetMatrix(i ++, mOldProjViewMatrix);
|
---|
726 |
|
---|
727 | Vector3 de;
|
---|
728 | de.x = mOldEyePos.x - mEyePos.x;
|
---|
729 | de.y = mOldEyePos.y - mEyePos.y;
|
---|
730 | de.z = mOldEyePos.z - mEyePos.z;
|
---|
731 |
|
---|
732 | sCgSsaoProgram->SetValue3f(i ++, de.x, de.y, de.z);
|
---|
733 |
|
---|
734 | for (int j = 0; j < 4; ++ j, ++ i)
|
---|
735 | {
|
---|
736 | sCgSsaoProgram->SetValue3f(i, mOldCornersView[j].x, mOldCornersView[j].y, mOldCornersView[j].z);
|
---|
737 | }
|
---|
738 |
|
---|
739 | sCgSsaoProgram->SetTexture(i ++, attribsTex);
|
---|
740 | sCgSsaoProgram->SetValue1f(i ++, mKernelRadius);
|
---|
741 | sCgSsaoProgram->SetValue1f(i ++, mSampleIntensity * mKernelRadius);
|
---|
742 |
|
---|
743 |
|
---|
744 | DrawQuad(sCgSsaoProgram);
|
---|
745 |
|
---|
746 | glPopAttrib();
|
---|
747 |
|
---|
748 | PrintGLerror("ssao first pass");
|
---|
749 | }
|
---|
750 |
|
---|
751 |
|
---|
752 | static void SetVertex(float x, float y, float x_offs, float y_offs)
|
---|
753 | {
|
---|
754 | glMultiTexCoord2fARB(GL_TEXTURE0_ARB, x, y); // center
|
---|
755 | glMultiTexCoord2fARB(GL_TEXTURE1_ARB, x - x_offs, y + y_offs); // left top
|
---|
756 | glMultiTexCoord2fARB(GL_TEXTURE2_ARB, x + x_offs, y - y_offs); // right bottom
|
---|
757 | glMultiTexCoord2fARB(GL_TEXTURE3_ARB, x + x_offs, y + y_offs); // right top
|
---|
758 | glMultiTexCoord2fARB(GL_TEXTURE4_ARB, x - x_offs, y - y_offs); // left bottom
|
---|
759 |
|
---|
760 | glMultiTexCoord4fARB(GL_TEXTURE5_ARB, x - x_offs, y, x + x_offs, y); // left right
|
---|
761 | glMultiTexCoord4fARB(GL_TEXTURE6_ARB, x, y + y_offs, x, y - y_offs); // top bottom
|
---|
762 |
|
---|
763 | //glVertex3f(x - 0.5f, y - 0.5f, -0.5f);
|
---|
764 | glVertex2f(x, y);
|
---|
765 | }
|
---|
766 |
|
---|
767 |
|
---|
768 | void DeferredRenderer::AntiAliasing(FrameBufferObject *fbo,
|
---|
769 | DirectionalLight *light,
|
---|
770 | bool displayFrame)
|
---|
771 | {
|
---|
772 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
773 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
774 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
775 |
|
---|
776 | // read the second buffer, write to the first buffer
|
---|
777 | if (!displayFrame)
|
---|
778 | FlipFbos(fbo);
|
---|
779 | else
|
---|
780 | // end of the pipeline => just draw image to screen
|
---|
781 | FrameBufferObject::Release();
|
---|
782 |
|
---|
783 | // the neighbouring texels
|
---|
784 | float xOffs = 1.0f / fbo->GetWidth();
|
---|
785 | float yOffs = 1.0f / fbo->GetHeight();
|
---|
786 |
|
---|
787 | sCgAntiAliasingProgram->SetTexture(0, colorsTex);
|
---|
788 | sCgAntiAliasingProgram->SetTexture(1, normalsTex);
|
---|
789 |
|
---|
790 | float offsets[16];
|
---|
791 | int i = 0;
|
---|
792 |
|
---|
793 | offsets[i] = -xOffs; offsets[i + 1] = yOffs; i += 2; // left top
|
---|
794 | offsets[i] = xOffs; offsets[i + 1] = -yOffs; i += 2; // right bottom
|
---|
795 | offsets[i] = xOffs; offsets[i + 1] = yOffs; i += 2; // right top
|
---|
796 | offsets[i] = -xOffs; offsets[i + 1] = -yOffs; i += 2; // left bottom
|
---|
797 | offsets[i] = -xOffs; offsets[i + 1] = .0f; i += 2; // left
|
---|
798 | offsets[i] = xOffs; offsets[i + 1] = .0f; i += 2; // right
|
---|
799 | offsets[i] = .0f; offsets[i + 1] = yOffs; i += 2; // top
|
---|
800 | offsets[i] = .0f; offsets[i + 1] = -yOffs; i += 2; // bottom
|
---|
801 |
|
---|
802 | sCgAntiAliasingProgram->SetArray2f(2, offsets, 8);
|
---|
803 |
|
---|
804 | DrawQuad(sCgAntiAliasingProgram);
|
---|
805 |
|
---|
806 | PrintGLerror("antialiasing");
|
---|
807 | }
|
---|
808 |
|
---|
809 |
|
---|
810 | void DeferredRenderer::FirstPass(FrameBufferObject *fbo, DirectionalLight *light)
|
---|
811 | {
|
---|
812 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
813 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
814 |
|
---|
815 | FlipFbos(fbo);
|
---|
816 |
|
---|
817 | const Vector3 lightDir = -light->GetDirection();
|
---|
818 |
|
---|
819 | sCgDeferredProgram->SetTexture(0, colorsTex);
|
---|
820 | sCgDeferredProgram->SetTexture(1, normalsTex);
|
---|
821 | sCgDeferredProgram->SetValue3f(2, lightDir.x, lightDir.y, lightDir.z);
|
---|
822 |
|
---|
823 | DrawQuad(sCgDeferredProgram);
|
---|
824 |
|
---|
825 | PrintGLerror("deferred shading");
|
---|
826 | }
|
---|
827 |
|
---|
828 |
|
---|
829 | void DeferredRenderer::ComputeGlobIllum(FrameBufferObject *fbo,
|
---|
830 | float tempCohFactor)
|
---|
831 | {
|
---|
832 | #if 0
|
---|
833 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
834 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
835 | #else
|
---|
836 | GLuint colorsTex = mDownSampleFbo->GetColorBuffer(0)->GetTexture();
|
---|
837 | GLuint normalsTex = mDownSampleFbo->GetColorBuffer(1)->GetTexture();
|
---|
838 | #endif
|
---|
839 |
|
---|
840 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
841 | glViewport(0, 0, mIllumFbo->GetWidth(), mIllumFbo->GetHeight());
|
---|
842 |
|
---|
843 | // read the second buffer, write to the first buffer
|
---|
844 | mIllumFbo->Bind();
|
---|
845 |
|
---|
846 | glDrawBuffers(2, mrt + mIllumFboIndex);
|
---|
847 |
|
---|
848 | GLuint oldSsaoTex = mIllumFbo->GetColorBuffer(2 - mIllumFboIndex)->GetTexture();
|
---|
849 | GLuint oldIllumTex = mIllumFbo->GetColorBuffer(2 - mIllumFboIndex + 1)->GetTexture();
|
---|
850 |
|
---|
851 | int i = 0;
|
---|
852 |
|
---|
853 | sCgGiProgram->SetTexture(i ++, colorsTex);
|
---|
854 | sCgGiProgram->SetTexture(i ++, normalsTex);
|
---|
855 | sCgGiProgram->SetTexture(i ++, noiseTex2D);
|
---|
856 | sCgGiProgram->SetTexture(i ++, oldSsaoTex);
|
---|
857 | sCgGiProgram->SetTexture(i ++, oldIllumTex);
|
---|
858 |
|
---|
859 | sCgGiProgram->SetValue1f(i ++,
|
---|
860 | (mUseTemporalCoherence && !mRegenerateSamples) ? tempCohFactor : 0);
|
---|
861 |
|
---|
862 | if (mUseTemporalCoherence || mRegenerateSamples)
|
---|
863 | {
|
---|
864 | mRegenerateSamples = false;
|
---|
865 |
|
---|
866 | // q: should we generate new samples or only rotate the old ones?
|
---|
867 | // in the first case, the sample patterns look nicer, but the kernel
|
---|
868 | // needs longer to converge
|
---|
869 | GenerateSamples(mSamplingMethod);
|
---|
870 |
|
---|
871 | sCgGiProgram->SetArray2f(i ++, (float *)samples2, NUM_SAMPLES);
|
---|
872 | }
|
---|
873 |
|
---|
874 | Vector3 bl = mCornersView[0];
|
---|
875 | Vector3 br = mCornersView[1];
|
---|
876 | Vector3 tl = mCornersView[2];
|
---|
877 | Vector3 tr = mCornersView[3];
|
---|
878 |
|
---|
879 | sCgGiProgram->SetValue3f(i ++, bl.x, bl.y, bl.z);
|
---|
880 | sCgGiProgram->SetValue3f(i ++, br.x, br.y, br.z);
|
---|
881 | sCgGiProgram->SetValue3f(i ++, tl.x, tl.y, tl.z);
|
---|
882 | sCgGiProgram->SetValue3f(i ++, tr.x, tr.y, tr.z);
|
---|
883 |
|
---|
884 | sCgGiProgram->SetMatrix(i ++, mOldProjViewMatrix);
|
---|
885 | sCgGiProgram->SetMatrix(i ++, mProjViewMatrix);
|
---|
886 |
|
---|
887 |
|
---|
888 | DrawQuad(sCgGiProgram);
|
---|
889 |
|
---|
890 | glPopAttrib();
|
---|
891 |
|
---|
892 | PrintGLerror("globillum first pass");
|
---|
893 | }
|
---|
894 |
|
---|
895 |
|
---|
896 | void DeferredRenderer::CombineIllum(FrameBufferObject *fbo)
|
---|
897 | {
|
---|
898 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
899 |
|
---|
900 | GLuint ssaoTex = mIllumFbo->GetColorBuffer(mIllumFboIndex)->GetTexture();
|
---|
901 | GLuint illumTex = mIllumFbo->GetColorBuffer(mIllumFboIndex + 1)->GetTexture();
|
---|
902 |
|
---|
903 | FlipFbos(fbo);
|
---|
904 |
|
---|
905 | sCgCombineIllumProgram->SetTexture(0, colorsTex);
|
---|
906 | sCgCombineIllumProgram->SetTexture(1, ssaoTex);
|
---|
907 | sCgCombineIllumProgram->SetTexture(2, illumTex);
|
---|
908 |
|
---|
909 | DrawQuad(sCgCombineIllumProgram);
|
---|
910 |
|
---|
911 | PrintGLerror("combine");
|
---|
912 | }
|
---|
913 |
|
---|
914 |
|
---|
915 | void DeferredRenderer::CombineSsao(FrameBufferObject *fbo)
|
---|
916 | {
|
---|
917 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
918 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
919 | GLuint ssaoTex = mIllumFbo->GetColorBuffer(mIllumFboIndex)->GetTexture();
|
---|
920 |
|
---|
921 | FlipFbos(fbo);
|
---|
922 |
|
---|
923 | int i = 0;
|
---|
924 |
|
---|
925 | sCgCombineSsaoProgram->SetTexture(i ++, colorsTex);
|
---|
926 | sCgCombineSsaoProgram->SetTexture(i ++, normalsTex);
|
---|
927 | sCgCombineSsaoProgram->SetTexture(i ++, ssaoTex);
|
---|
928 |
|
---|
929 | sCgCombineSsaoProgram->SetArray2f(i ++, (float *)ssaoFilterOffsets, NUM_SSAO_FILTER_SAMPLES);
|
---|
930 | sCgCombineSsaoProgram->SetArray1f(i ++, (float *)ssaoFilterWeights, NUM_SSAO_FILTER_SAMPLES);
|
---|
931 | sCgCombineSsaoProgram->SetValue1f(i ++, mSsaoFilterRadius);
|
---|
932 |
|
---|
933 | sCgCombineSsaoProgram->SetMatrix(i++, mProjViewMatrix);
|
---|
934 |
|
---|
935 | for (int j = 0; j < 4; ++ j, ++ i)
|
---|
936 | sCgCombineSsaoProgram->SetValue3f(i, mCornersView[j].x, mCornersView[j].y, mCornersView[j].z);
|
---|
937 |
|
---|
938 | sCgCombineSsaoProgram->SetValue1f(i ++, mIllumFbo->GetColorBuffer(mIllumFboIndex)->GetWidth());
|
---|
939 | sCgCombineSsaoProgram->SetValue1f(i ++, mIllumFbo->GetColorBuffer(mIllumFboIndex)->GetHeight());
|
---|
940 |
|
---|
941 | DrawQuad(sCgCombineSsaoProgram);
|
---|
942 |
|
---|
943 | PrintGLerror("combine ssao");
|
---|
944 | }
|
---|
945 |
|
---|
946 |
|
---|
947 | void DeferredRenderer::FirstPassShadow(FrameBufferObject *fbo,
|
---|
948 | DirectionalLight *light,
|
---|
949 | ShadowMap *shadowMap)
|
---|
950 | {
|
---|
951 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
952 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
953 |
|
---|
954 | GLuint shadowTex = shadowMap->GetDepthTexture();
|
---|
955 |
|
---|
956 | Matrix4x4 shadowMatrix;
|
---|
957 | shadowMap->GetTextureMatrix(shadowMatrix);
|
---|
958 |
|
---|
959 |
|
---|
960 | FlipFbos(fbo);
|
---|
961 |
|
---|
962 | sCgDeferredShadowProgram->SetTexture(0, colorsTex);
|
---|
963 | sCgDeferredShadowProgram->SetTexture(1, normalsTex);
|
---|
964 | sCgDeferredShadowProgram->SetTexture(2, shadowTex);
|
---|
965 | sCgDeferredShadowProgram->SetTexture(3, noiseTex2D);
|
---|
966 | sCgDeferredShadowProgram->SetMatrix(4, shadowMatrix);
|
---|
967 | sCgDeferredShadowProgram->SetValue1f(5, 2.0f / shadowMap->GetSize());
|
---|
968 |
|
---|
969 | const Vector3 lightDir = -light->GetDirection();
|
---|
970 | sCgDeferredShadowProgram->SetValue3f(6, lightDir.x, lightDir.y, lightDir.z);
|
---|
971 | sCgDeferredShadowProgram->SetValue3f(7, mEyePos.x, mEyePos.y, mEyePos.z);
|
---|
972 |
|
---|
973 | DrawQuad(sCgDeferredShadowProgram);
|
---|
974 |
|
---|
975 | PrintGLerror("deferred shading + shadows");
|
---|
976 | }
|
---|
977 |
|
---|
978 |
|
---|
979 | void DeferredRenderer::ComputeToneParameters(FrameBufferObject *fbo,
|
---|
980 | DirectionalLight *light,
|
---|
981 | float &imageKey,
|
---|
982 | float &whiteLum,
|
---|
983 | float &middleGrey)
|
---|
984 | {
|
---|
985 | // hack: estimate value where sky burns out
|
---|
986 | whiteLum = log(WHITE_LUMINANCE);
|
---|
987 |
|
---|
988 | ////////////////////
|
---|
989 | //-- linear interpolate brightness key depending on the current sun position
|
---|
990 |
|
---|
991 | const float minKey = 0.09f;
|
---|
992 | const float maxKey = 0.36f;
|
---|
993 |
|
---|
994 | const float lightIntensity = DotProd(-light->GetDirection(), Vector3::UNIT_Z());
|
---|
995 | middleGrey = lightIntensity * maxKey + (1.0f - lightIntensity) * minKey;
|
---|
996 |
|
---|
997 |
|
---|
998 | //////////
|
---|
999 | //-- compute avg loglum
|
---|
1000 |
|
---|
1001 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
1002 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
1003 |
|
---|
1004 | FlipFbos(fbo);
|
---|
1005 |
|
---|
1006 | sCgLogLumProgram->SetTexture(0, colorsTex);
|
---|
1007 | DrawQuad(sCgLogLumProgram);
|
---|
1008 |
|
---|
1009 | PrintGLerror("ToneMapParams");
|
---|
1010 |
|
---|
1011 |
|
---|
1012 | ///////////////////
|
---|
1013 | //-- compute avg loglum in scene using mipmapping
|
---|
1014 |
|
---|
1015 | glBindTexture(GL_TEXTURE_2D, fbo->GetColorBuffer(colorBufferIdx)->GetTexture());
|
---|
1016 | glGenerateMipmapEXT(GL_TEXTURE_2D);
|
---|
1017 | }
|
---|
1018 |
|
---|
1019 |
|
---|
1020 | static void ExportData(float *data, int w, int h)
|
---|
1021 | {
|
---|
1022 | startil();
|
---|
1023 |
|
---|
1024 | cout << "w: " << w << " h: " << h << endl;
|
---|
1025 | ILstring filename = ILstring("downsample2.jpg");
|
---|
1026 | ilRegisterType(IL_FLOAT);
|
---|
1027 |
|
---|
1028 | const int depth = 1;
|
---|
1029 | const int bpp = 4;
|
---|
1030 |
|
---|
1031 | if (!ilTexImage(w, h, depth, bpp, IL_RGBA, IL_FLOAT, data))
|
---|
1032 | {
|
---|
1033 | cerr << "IL error " << ilGetError() << endl;
|
---|
1034 | stopil();
|
---|
1035 | return;
|
---|
1036 | }
|
---|
1037 |
|
---|
1038 | if (!ilSaveImage(filename))
|
---|
1039 | {
|
---|
1040 | cerr << "TGA write error " << ilGetError() << endl;
|
---|
1041 | }
|
---|
1042 |
|
---|
1043 | stopil();
|
---|
1044 | }
|
---|
1045 |
|
---|
1046 |
|
---|
1047 | void DeferredRenderer::PrepareSsao(FrameBufferObject *fbo)
|
---|
1048 | {
|
---|
1049 | GLuint colorsTex = fbo->GetColorBuffer(colorBufferIdx)->GetTexture();
|
---|
1050 | GLuint normalsTex = fbo->GetColorBuffer(1)->GetTexture();
|
---|
1051 | GLuint diffVals = fbo->GetColorBuffer(2)->GetTexture();
|
---|
1052 | // flip flop between illumination buffers
|
---|
1053 | GLuint oldTex = mIllumFbo->GetColorBuffer(2 - mIllumFboIndex)->GetTexture();
|
---|
1054 |
|
---|
1055 | int i = 0;
|
---|
1056 |
|
---|
1057 | sCgPrepareSsaoProgram->SetTexture(i ++, colorsTex);
|
---|
1058 | sCgPrepareSsaoProgram->SetTexture(i ++, normalsTex);
|
---|
1059 | sCgPrepareSsaoProgram->SetTexture(i ++, diffVals);
|
---|
1060 | sCgPrepareSsaoProgram->SetTexture(i ++, oldTex);
|
---|
1061 |
|
---|
1062 | Vector3 de;
|
---|
1063 | de.x = mOldEyePos.x - mEyePos.x;
|
---|
1064 | de.y = mOldEyePos.y - mEyePos.y;
|
---|
1065 | de.z = mOldEyePos.z - mEyePos.z;
|
---|
1066 |
|
---|
1067 | sCgPrepareSsaoProgram->SetValue3f(i ++, de.x, de.y, de.z);
|
---|
1068 |
|
---|
1069 | sCgPrepareSsaoProgram->SetMatrix(i ++, mProjViewMatrix);
|
---|
1070 | sCgPrepareSsaoProgram->SetMatrix(i ++, mOldProjViewMatrix);
|
---|
1071 |
|
---|
1072 | for (int j = 0; j < 4; ++ j, ++ i)
|
---|
1073 | sCgPrepareSsaoProgram->SetValue3f(i, mOldCornersView[j].x, mOldCornersView[j].y, mOldCornersView[j].z);
|
---|
1074 |
|
---|
1075 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
1076 | glViewport(0, 0, mDownSampleFbo->GetWidth(), mDownSampleFbo->GetHeight());
|
---|
1077 |
|
---|
1078 | mDownSampleFbo->Bind();
|
---|
1079 |
|
---|
1080 | // prepare downsampled depth and normal texture for ssao
|
---|
1081 | glDrawBuffers(2, mrt);
|
---|
1082 |
|
---|
1083 | DrawQuad(sCgPrepareSsaoProgram);
|
---|
1084 |
|
---|
1085 | glPopAttrib();
|
---|
1086 | PrintGLerror("prepareSsao");
|
---|
1087 | }
|
---|
1088 |
|
---|
1089 |
|
---|
1090 | void DeferredRenderer::DownSample(FrameBufferObject *fbo,
|
---|
1091 | int bufferIdx,
|
---|
1092 | FrameBufferObject *downSampleFbo,
|
---|
1093 | int downSampleBufferIdx,
|
---|
1094 | ShaderProgram *program)
|
---|
1095 | {
|
---|
1096 | ColorBufferObject *buffer = fbo->GetColorBuffer(bufferIdx);
|
---|
1097 | GLuint tex = buffer->GetTexture();
|
---|
1098 |
|
---|
1099 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
1100 | glViewport(0, 0, downSampleFbo->GetWidth(), downSampleFbo->GetHeight());
|
---|
1101 |
|
---|
1102 | downSampleFbo->Bind();
|
---|
1103 |
|
---|
1104 | program->SetTexture(0, tex);
|
---|
1105 | glDrawBuffers(1, mrt + downSampleBufferIdx);
|
---|
1106 |
|
---|
1107 | DrawQuad(program);
|
---|
1108 |
|
---|
1109 | glPopAttrib();
|
---|
1110 | PrintGLerror("downsample");
|
---|
1111 | }
|
---|
1112 |
|
---|
1113 |
|
---|
1114 | void DeferredRenderer::ToneMap(FrameBufferObject *fbo,
|
---|
1115 | float imageKey,
|
---|
1116 | float whiteLum,
|
---|
1117 | float middleGrey)
|
---|
1118 | {
|
---|
1119 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
1120 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
1121 | //FrameBufferObject::Release();
|
---|
1122 |
|
---|
1123 | FlipFbos(fbo);
|
---|
1124 |
|
---|
1125 | sCgToneProgram->SetTexture(0, colorsTex);
|
---|
1126 | sCgToneProgram->SetValue1f(1, imageKey);
|
---|
1127 | sCgToneProgram->SetValue1f(2, whiteLum);
|
---|
1128 | sCgToneProgram->SetValue1f(3, middleGrey);
|
---|
1129 |
|
---|
1130 | DrawQuad(sCgToneProgram);
|
---|
1131 |
|
---|
1132 | PrintGLerror("ToneMap");
|
---|
1133 | }
|
---|
1134 |
|
---|
1135 |
|
---|
1136 | void DeferredRenderer::Output(FrameBufferObject *fbo)
|
---|
1137 | {
|
---|
1138 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
1139 | glViewport(0, 0, fbo->GetWidth(), fbo->GetHeight());
|
---|
1140 |
|
---|
1141 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
1142 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
1143 |
|
---|
1144 | sCgDownSampleProgram->SetTexture(0, colorsTex);
|
---|
1145 |
|
---|
1146 | FrameBufferObject::Release();
|
---|
1147 | DrawQuad(sCgDownSampleProgram);
|
---|
1148 |
|
---|
1149 | PrintGLerror("output");
|
---|
1150 | }
|
---|
1151 |
|
---|
1152 |
|
---|
1153 | void DeferredRenderer::InitFrame()
|
---|
1154 | {
|
---|
1155 | for (int i = 0; i < 4; ++ i)
|
---|
1156 | mOldCornersView[i] = mCornersView[i];
|
---|
1157 |
|
---|
1158 | mOldProjViewMatrix = mProjViewMatrix;
|
---|
1159 | mOldEyePos = mEyePos;
|
---|
1160 | mEyePos = mCamera->GetPosition();
|
---|
1161 |
|
---|
1162 | // hack: temporarily change far to improve precision
|
---|
1163 | const float oldFar = mCamera->GetFar();
|
---|
1164 | const float oldNear = mCamera->GetNear();
|
---|
1165 |
|
---|
1166 |
|
---|
1167 | Matrix4x4 matViewing, matProjection;
|
---|
1168 |
|
---|
1169 |
|
---|
1170 | ///////////////////
|
---|
1171 |
|
---|
1172 | // use view orientation as we assume that the eye point is always in the center
|
---|
1173 | // of our coordinate system, this way we have the highest precision near the eye point
|
---|
1174 | mCamera->GetViewOrientationMatrix(matViewing);
|
---|
1175 | mCamera->GetProjectionMatrix(matProjection);
|
---|
1176 |
|
---|
1177 | mProjViewMatrix = matViewing * matProjection;
|
---|
1178 | ComputeViewVectors(mCamera, mCornersView[0], mCornersView[1], mCornersView[2], mCornersView[3]);
|
---|
1179 |
|
---|
1180 |
|
---|
1181 | // switch roles of old and new fbo
|
---|
1182 | // the algorihm uses two input fbos, where the one
|
---|
1183 | // contais the color buffer from the last frame,
|
---|
1184 | // the other one will be written
|
---|
1185 |
|
---|
1186 | mIllumFboIndex = 2 - mIllumFboIndex;
|
---|
1187 |
|
---|
1188 | // enable fragment shading
|
---|
1189 | ShaderManager::GetSingleton()->EnableFragmentProfile();
|
---|
1190 |
|
---|
1191 | glDisable(GL_ALPHA_TEST);
|
---|
1192 | glDisable(GL_TEXTURE_2D);
|
---|
1193 | glDisable(GL_LIGHTING);
|
---|
1194 | glDisable(GL_BLEND);
|
---|
1195 | glDisable(GL_DEPTH_TEST);
|
---|
1196 |
|
---|
1197 | glPolygonMode(GL_FRONT, GL_FILL);
|
---|
1198 |
|
---|
1199 | glMatrixMode(GL_PROJECTION);
|
---|
1200 | glPushMatrix();
|
---|
1201 | glLoadIdentity();
|
---|
1202 |
|
---|
1203 | gluOrtho2D(0, 1, 0, 1);
|
---|
1204 |
|
---|
1205 |
|
---|
1206 | glMatrixMode(GL_MODELVIEW);
|
---|
1207 | glPushMatrix();
|
---|
1208 | glLoadIdentity();
|
---|
1209 |
|
---|
1210 |
|
---|
1211 | glPushAttrib(GL_VIEWPORT_BIT);
|
---|
1212 | glViewport(0, 0, mWidth, mHeight);
|
---|
1213 |
|
---|
1214 | // revert to old far and near plane
|
---|
1215 | mCamera->SetFar(oldFar);
|
---|
1216 | mCamera->SetNear(oldNear);
|
---|
1217 | }
|
---|
1218 |
|
---|
1219 |
|
---|
1220 | void DeferredRenderer::LenseFlare(FrameBufferObject *fbo,
|
---|
1221 | DirectionalLight *light
|
---|
1222 | )
|
---|
1223 | {
|
---|
1224 | // light source not visible
|
---|
1225 | if (!mSunVisiblePixels) return;
|
---|
1226 |
|
---|
1227 | // the sun is a large distance in the reverse light direction
|
---|
1228 | // => extrapolate light pos
|
---|
1229 | const Vector3 lightPos = light->GetDirection() * -1e3f;
|
---|
1230 |
|
---|
1231 | float w;
|
---|
1232 | Vector3 projLightPos = mProjViewMatrix.Transform(w, lightPos, 1.0f);
|
---|
1233 | projLightPos /= w;
|
---|
1234 | projLightPos = projLightPos * 0.5f + Vector3(0.5f);
|
---|
1235 |
|
---|
1236 | // vector to light from screen center in texture space
|
---|
1237 | Vector3 vectorToLight = projLightPos - Vector3(0.5f);
|
---|
1238 | vectorToLight.z = .0f;
|
---|
1239 |
|
---|
1240 | const float distanceToLight = Magnitude(vectorToLight);
|
---|
1241 | vectorToLight /= distanceToLight;
|
---|
1242 |
|
---|
1243 | //cout << "dist " << distanceToLight << " v " << vectorToLight << endl;
|
---|
1244 |
|
---|
1245 |
|
---|
1246 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
1247 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
1248 |
|
---|
1249 | FlipFbos(fbo);
|
---|
1250 |
|
---|
1251 | int i = 0;
|
---|
1252 |
|
---|
1253 | sCgLenseFlareProgram->SetTexture(i ++, colorsTex);
|
---|
1254 | sCgLenseFlareProgram->SetTexture(i ++, sHaloTex[0]->GetId());
|
---|
1255 | sCgLenseFlareProgram->SetTexture(i ++, sHaloTex[1]->GetId());
|
---|
1256 | sCgLenseFlareProgram->SetTexture(i ++, sHaloTex[2]->GetId());
|
---|
1257 | sCgLenseFlareProgram->SetTexture(i ++, sHaloTex[3]->GetId());
|
---|
1258 | sCgLenseFlareProgram->SetTexture(i ++, sHaloTex[4]->GetId());
|
---|
1259 | sCgLenseFlareProgram->SetValue2f(i ++, vectorToLight.x, vectorToLight.y);
|
---|
1260 | sCgLenseFlareProgram->SetValue1f(i ++, distanceToLight);
|
---|
1261 | sCgLenseFlareProgram->SetValue1f(i ++, (float)mSunVisiblePixels);
|
---|
1262 |
|
---|
1263 | DrawQuad(sCgLenseFlareProgram);
|
---|
1264 |
|
---|
1265 | PrintGLerror("LenseFlare");
|
---|
1266 | }
|
---|
1267 |
|
---|
1268 |
|
---|
1269 | void DeferredRenderer::SaveFrame(FrameBufferObject *fbo)
|
---|
1270 | {
|
---|
1271 | ColorBufferObject *colorBuffer = fbo->GetColorBuffer(colorBufferIdx);
|
---|
1272 | GLuint colorsTex = colorBuffer->GetTexture();
|
---|
1273 |
|
---|
1274 | GLubyte *data = new GLubyte[mWidth * mHeight * 4];
|
---|
1275 |
|
---|
1276 | // grab texture data
|
---|
1277 | glEnable(GL_TEXTURE_2D);
|
---|
1278 | glBindTexture(GL_TEXTURE_2D, colorsTex);
|
---|
1279 | glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
|
---|
1280 |
|
---|
1281 | glBindTexture(GL_TEXTURE_2D, 0);
|
---|
1282 | glDisable(GL_TEXTURE_2D);
|
---|
1283 |
|
---|
1284 | /////////////////
|
---|
1285 |
|
---|
1286 | startil();
|
---|
1287 |
|
---|
1288 | static char imageName[200];
|
---|
1289 | sprintf(imageName, "%s_%05d.bmp", mSavedFrameSuffix.c_str(), mSavedFrameNumber);
|
---|
1290 |
|
---|
1291 | ILstring fileName = ILstring(imageName);
|
---|
1292 | ilRegisterType(IL_FLOAT);
|
---|
1293 |
|
---|
1294 | const int depth = 1;
|
---|
1295 | const int bpp = 4;
|
---|
1296 |
|
---|
1297 | if (!ilTexImage(mWidth, mHeight, depth, bpp, IL_RGBA, IL_UNSIGNED_BYTE, data))
|
---|
1298 | {
|
---|
1299 | cerr << "IL error " << ilGetError() << endl;
|
---|
1300 | stopil();
|
---|
1301 | return;
|
---|
1302 | }
|
---|
1303 |
|
---|
1304 | ilEnable(IL_FILE_OVERWRITE);
|
---|
1305 |
|
---|
1306 | if (!ilSaveImage(fileName))
|
---|
1307 | {
|
---|
1308 | cerr << "TGA write error " << ilGetError() << endl;
|
---|
1309 | }
|
---|
1310 |
|
---|
1311 | delete [] data;
|
---|
1312 |
|
---|
1313 | stopil();
|
---|
1314 |
|
---|
1315 | PrintGLerror("Store frame");
|
---|
1316 | }
|
---|
1317 |
|
---|
1318 |
|
---|
1319 | void DeferredRenderer::SetUseTemporalCoherence(bool temporal)
|
---|
1320 | {
|
---|
1321 | mUseTemporalCoherence = temporal;
|
---|
1322 | }
|
---|
1323 |
|
---|
1324 |
|
---|
1325 | void DeferredRenderer::SetSamplingMethod(SAMPLING_METHOD s)
|
---|
1326 | {
|
---|
1327 | if (s != mSamplingMethod)
|
---|
1328 | {
|
---|
1329 | mSamplingMethod = s;
|
---|
1330 | mRegenerateSamples = true;
|
---|
1331 | }
|
---|
1332 | }
|
---|
1333 |
|
---|
1334 |
|
---|
1335 | void DeferredRenderer::SetShadingMethod(SHADING_METHOD s)
|
---|
1336 | {
|
---|
1337 | if (s != mShadingMethod)
|
---|
1338 | {
|
---|
1339 | mShadingMethod = s;
|
---|
1340 | mRegenerateSamples = true;
|
---|
1341 | }
|
---|
1342 | }
|
---|
1343 |
|
---|
1344 |
|
---|
1345 | #if TODO
|
---|
1346 |
|
---|
1347 | void DeferredRenderer::SetNumSamples(int numSamples)
|
---|
1348 | {
|
---|
1349 | mNumSamples = numSamples;
|
---|
1350 | }
|
---|
1351 |
|
---|
1352 | #endif
|
---|
1353 |
|
---|
1354 |
|
---|
1355 | void DeferredRenderer::SetSampleIntensity(float sampleIntensity)
|
---|
1356 | {
|
---|
1357 | mSampleIntensity = sampleIntensity;
|
---|
1358 | }
|
---|
1359 |
|
---|
1360 |
|
---|
1361 | void DeferredRenderer::SetKernelRadius(float kernelRadius)
|
---|
1362 | {
|
---|
1363 | mKernelRadius = kernelRadius;
|
---|
1364 | }
|
---|
1365 |
|
---|
1366 |
|
---|
1367 | void DeferredRenderer::SetSsaoFilterRadius(float ssaoFilterRadius)
|
---|
1368 | {
|
---|
1369 | mSsaoFilterRadius = ssaoFilterRadius;
|
---|
1370 | }
|
---|
1371 |
|
---|
1372 |
|
---|
1373 | void DeferredRenderer::SetSortSamples(bool sortSamples)
|
---|
1374 | {
|
---|
1375 | mSortSamples = sortSamples;
|
---|
1376 | }
|
---|
1377 |
|
---|
1378 |
|
---|
1379 | void DeferredRenderer::SetSunVisiblePixels(int pixels)
|
---|
1380 | {
|
---|
1381 | mSunVisiblePixels = pixels;
|
---|
1382 | }
|
---|
1383 |
|
---|
1384 |
|
---|
1385 | void DeferredRenderer::SetSaveFrame(const string &suffix, int frameNumber)
|
---|
1386 | {
|
---|
1387 | mSavedFrameSuffix = suffix;
|
---|
1388 | mSavedFrameNumber = frameNumber;
|
---|
1389 | }
|
---|
1390 |
|
---|
1391 |
|
---|
1392 | } // namespace
|
---|