1 | #include "Mesh.h" |
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2 | #include "GlRenderer.h" |
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3 | #include "ViewCellsManager.h" |
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4 | #include "SceneGraph.h" |
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5 | #include "Pvs.h" |
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6 | #include "Viewcell.h" |
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7 | #include "Beam.h" |
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8 | #include <GL/glext.h> |
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9 | #include <Cg/cg.h>
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10 | #include <Cg/cgGL.h> |
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11 | |
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12 | static CGcontext sCgContext = NULL;
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13 | static CGprogram sCgFragmentProgram = NULL; |
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14 | |
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15 | static CGparameter sCgKdParam = NULL;
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16 | static CGparameter sCgModelViewProjParam = NULL;
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17 | |
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18 | |
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19 | static CGprofile sCgFragmentProfile = CG_PROFILE_FP30; |
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20 | |
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21 | GLuint depthMap; |
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22 | const int depthMapSize = 512; |
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23 | |
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24 | GlRendererWidget *rendererWidget = NULL; |
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25 | |
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26 | #ifdef _WIN32 |
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27 | PFNGLGENOCCLUSIONQUERIESNVPROC glGenOcclusionQueriesNV; |
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28 | PFNGLBEGINOCCLUSIONQUERYNVPROC glBeginOcclusionQueryNV; |
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29 | PFNGLENDOCCLUSIONQUERYNVPROC glEndOcclusionQueryNV; |
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30 | PFNGLGETOCCLUSIONQUERYUIVNVPROC glGetOcclusionQueryuivNV; |
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31 | #endif |
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32 | |
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33 | GlRenderer::GlRenderer(SceneGraph *sceneGraph, |
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34 | ViewCellsManager *viewCellsManager): |
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35 | Renderer(sceneGraph, viewCellsManager) |
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36 | { |
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37 | mSceneGraph->CollectObjects(&mObjects); |
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38 | mViewPoint = mSceneGraph->GetBox().Center(); |
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39 | mViewDirection = Vector3(0,0,1); |
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40 | // timerId = startTimer(10); |
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41 | mFrame = 0; |
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42 | mWireFrame = false; |
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43 | } |
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44 | |
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45 | GlRenderer::~GlRenderer() |
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46 | { |
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47 | } |
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48 | |
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49 | void |
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50 | GlRenderer::RenderIntersectable(Intersectable *object) |
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51 | { |
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52 | |
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53 | SetupFalseColor(object->mId); |
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54 | |
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55 | switch (object->Type()) { |
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56 | case Intersectable::MESH_INSTANCE: |
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57 | RenderMeshInstance((MeshInstance *)object); |
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58 | break; |
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59 | default: |
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60 | cerr<<"Rendering this object not yet implemented\n"; |
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61 | break; |
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62 | } |
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63 | } |
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64 | |
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65 | |
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66 | void |
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67 | GlRenderer::RenderMeshInstance(MeshInstance *mi) |
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68 | { |
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69 | RenderMesh(mi->GetMesh()); |
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70 | } |
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71 | |
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72 | void |
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73 | GlRenderer::SetupFalseColor(const int id) |
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74 | { |
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75 | // swap bits of the color |
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76 | |
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77 | glColor3ub(id&255, (id>>8)&255, (id>>16)&255); |
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78 | } |
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79 | |
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80 | void |
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81 | GlRenderer::SetupMaterial(Material *m) |
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82 | { |
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83 | if (m) |
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84 | glColor3fv(&(m->mDiffuseColor.r)); |
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85 | else |
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86 | glColor3f(1.0f, 1.0f, 1.0f); |
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87 | } |
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88 | |
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89 | void |
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90 | GlRenderer::RenderMesh(Mesh *mesh) |
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91 | { |
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92 | int i = 0; |
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93 | |
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94 | if (!mUseFalseColors) |
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95 | SetupMaterial(mesh->mMaterial); |
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96 | |
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97 | for (i=0; i < mesh->mFaces.size(); i++) { |
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98 | if (mWireFrame) |
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99 | glBegin(GL_LINE_LOOP); |
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100 | else |
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101 | glBegin(GL_POLYGON); |
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102 | |
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103 | Face *face = mesh->mFaces[i]; |
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104 | for (int j = 0; j < face->mVertexIndices.size(); j++) { |
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105 | glVertex3fv(&mesh->mVertices[face->mVertexIndices[j]].x); |
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106 | } |
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107 | glEnd(); |
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108 | } |
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109 | } |
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110 | |
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111 | void |
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112 | GlRenderer::InitGL() |
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113 | { |
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114 | glMatrixMode(GL_PROJECTION); |
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115 | glLoadIdentity(); |
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116 | |
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117 | glMatrixMode(GL_MODELVIEW); |
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118 | glLoadIdentity(); |
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119 | |
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120 | glEnable(GL_CULL_FACE); |
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121 | glShadeModel(GL_FLAT); |
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122 | glEnable(GL_DEPTH_TEST); |
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123 | glEnable(GL_CULL_FACE); |
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124 | |
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125 | glGenOcclusionQueriesNV = (PFNGLGENOCCLUSIONQUERIESNVPROC) |
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126 | wglGetProcAddress("glGenOcclusionQueriesNV"); |
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127 | glBeginOcclusionQueryNV = (PFNGLBEGINOCCLUSIONQUERYNVPROC) |
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128 | wglGetProcAddress("glBeginOcclusionQueryNV"); |
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129 | glEndOcclusionQueryNV = (PFNGLENDOCCLUSIONQUERYNVPROC) |
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130 | wglGetProcAddress("glEndOcclusionQueryNV"); |
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131 | glGetOcclusionQueryuivNV = (PFNGLGETOCCLUSIONQUERYUIVNVPROC) |
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132 | wglGetProcAddress("glGetOcclusionQueryuivNV"); |
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133 | |
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134 | // initialise second depth buffer texture
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135 | glGenTextures(1, &depthMap);
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136 | glBindTexture(GL_TEXTURE_2D, depthMap);
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137 |
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138 | glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, depthMapSize,
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139 | depthMapSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
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140 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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141 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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142 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); |
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143 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); |
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144 | |
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145 | // cg initialization |
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146 | sCgContext = cgCreateContext();
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147 |
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148 | sCgFragmentProgram = cgCreateProgramFromFile(sCgContext,
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149 | CG_SOURCE, "dual_depth.cg", |
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150 | sCgFragmentProfile, |
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151 | NULL, |
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152 | NULL); |
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153 | } |
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154 | |
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155 | |
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156 | |
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157 | void |
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158 | GlRenderer::SetupProjection(const int w, const int h) |
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159 | { |
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160 | glViewport(0, 0, w, h); |
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161 | glMatrixMode(GL_PROJECTION); |
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162 | glLoadIdentity(); |
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163 | gluPerspective(70.0, 1.0, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal())); |
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164 | glMatrixMode(GL_MODELVIEW); |
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165 | } |
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166 | |
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167 | void |
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168 | GlRenderer::SetupCamera() |
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169 | { |
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170 | Vector3 target = mViewPoint + mViewDirection; |
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171 | Vector3 up(0,1,0); |
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172 | |
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173 | glLoadIdentity(); |
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174 | gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z, |
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175 | target.x, target.y, target.z, |
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176 | up.x, up.y, up.z); |
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177 | } |
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178 | |
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179 | void |
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180 | GlRenderer::RandomViewPoint() |
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181 | { |
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182 | Vector3 pVector = Vector3(halton.GetNumber(1), |
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183 | halton.GetNumber(2), |
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184 | halton.GetNumber(3)); |
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185 | |
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186 | Vector3 dVector = Vector3(2*M_PI*halton.GetNumber(4), |
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187 | M_PI*halton.GetNumber(5), |
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188 | 0.0f); |
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189 | |
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190 | mViewPoint = mSceneGraph->GetBox().GetPoint(pVector); |
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191 | |
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192 | mViewDirection = Normalize(Vector3(sin(dVector.x), |
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193 | // cos(dVector.y), |
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194 | 0.0f, |
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195 | cos(dVector.x))); |
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196 | |
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197 | halton.GenerateNext(); |
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198 | } |
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199 | |
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200 | |
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201 | float |
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202 | GlRenderer::GetPixelError() |
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203 | { |
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204 | float pErrorPixels = -1.0f; |
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205 | |
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206 | glReadBuffer(GL_BACK); |
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207 | |
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208 | mUseFalseColors = true; |
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209 | |
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210 | SetupCamera(); |
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211 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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212 | glEnable( GL_CULL_FACE ); |
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213 | |
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214 | RenderScene(); |
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215 | |
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216 | // now check whether any backfacing polygon would pass the depth test |
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217 | static int query = -1; |
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218 | if (query == -1) |
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219 | glGenOcclusionQueriesNV(1, (unsigned int *)&query); |
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220 | |
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221 | glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); |
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222 | glDepthMask(GL_FALSE); |
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223 | glDisable( GL_CULL_FACE ); |
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224 | |
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225 | glBeginOcclusionQueryNV(query); |
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226 | |
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227 | RenderScene(); |
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228 | |
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229 | glEndOcclusionQueryNV(); |
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230 | |
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231 | // at this point, if possible, go and do some other computation |
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232 | glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); |
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233 | glDepthMask(GL_TRUE); |
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234 | glEnable( GL_CULL_FACE ); |
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235 | |
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236 | unsigned int pixelCount; |
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237 | // reenable other state |
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238 | glGetOcclusionQueryuivNV(query, |
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239 | GL_PIXEL_COUNT_NV, |
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240 | &pixelCount); |
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241 | |
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242 | if (pixelCount > 0) |
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243 | return -1.0f; // backfacing polygon found -> not a valid viewspace sample |
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244 | |
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245 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint); |
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246 | |
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247 | if (viewcell) { |
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248 | SetupCamera(); |
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249 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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250 | |
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251 | // Render PVS |
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252 | std::map<Intersectable *, |
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253 | PvsData<Intersectable *>, |
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254 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin(); |
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255 | |
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256 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) { |
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257 | Intersectable *object = (*it).first; |
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258 | RenderIntersectable(object); |
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259 | } |
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260 | |
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261 | glBeginOcclusionQueryNV(query); |
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262 | |
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263 | SetupCamera(); |
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264 | |
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265 | RenderScene(); |
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266 | |
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267 | glEndOcclusionQueryNV(); |
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268 | |
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269 | |
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270 | unsigned int pixelCount; |
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271 | // reenable other state |
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272 | glGetOcclusionQueryuivNV(query, |
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273 | GL_PIXEL_COUNT_NV, |
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274 | &pixelCount); |
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275 | |
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276 | pErrorPixels = (100.f*pixelCount)/(GetWidth()*GetHeight()); |
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277 | } |
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278 | |
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279 | return pErrorPixels; |
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280 | } |
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281 | |
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282 | |
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283 | float |
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284 | GlRendererWidget::RenderErrors() |
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285 | { |
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286 | float pErrorPixels = -1.0f; |
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287 | |
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288 | glReadBuffer(GL_BACK); |
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289 | |
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290 | mUseFalseColors = true; |
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291 | |
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292 | SetupCamera(); |
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293 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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294 | glEnable( GL_CULL_FACE ); |
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295 | |
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296 | ObjectContainer::const_iterator oi = mObjects.begin(); |
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297 | for (; oi != mObjects.end(); oi++) |
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298 | RenderIntersectable(*oi); |
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299 | |
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300 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint); |
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301 | |
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302 | QImage im1, im2; |
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303 | QImage diff; |
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304 | |
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305 | if (viewcell) { |
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306 | // read back the texture |
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307 | im1 = grabFrameBuffer(true); |
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308 | |
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309 | SetupCamera(); |
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310 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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311 | |
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312 | std::map<Intersectable *, |
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313 | PvsData<Intersectable *>, |
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314 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin(); |
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315 | |
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316 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) { |
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317 | Intersectable *object = (*it).first; |
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318 | RenderIntersectable(object); |
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319 | } |
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320 | |
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321 | // read back the texture |
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322 | im2 = grabFrameBuffer(true); |
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323 | |
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324 | diff = im1; |
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325 | int x, y; |
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326 | int errorPixels = 0; |
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327 | |
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328 | for (y = 0; y < im1.height(); y++) |
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329 | for (x = 0; x < im1.width(); x++) |
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330 | if (im1.pixel(x, y) == im2.pixel(x, y)) |
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331 | diff.setPixel(x, y, qRgba(0,0,0,0)); |
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332 | else { |
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333 | diff.setPixel(x, y, qRgba(255,128,128,255)); |
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334 | errorPixels++; |
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335 | } |
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336 | pErrorPixels = (100.f*errorPixels)/(im1.height()*im1.width()); |
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337 | } |
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338 | |
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339 | // now render the pvs again |
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340 | SetupCamera(); |
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341 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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342 | mUseFalseColors = false; |
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343 | |
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344 | oi = mObjects.begin(); |
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345 | for (; oi != mObjects.end(); oi++) |
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346 | RenderIntersectable(*oi); |
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347 | |
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348 | // now render im1 |
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349 | if (viewcell) { |
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350 | if (mTopView) { |
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351 | mWireFrame = true; |
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352 | RenderMeshInstance(viewcell); |
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353 | mWireFrame = false; |
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354 | } |
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355 | |
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356 | // init ortographic projection |
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357 | glMatrixMode(GL_PROJECTION); |
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358 | glPushMatrix(); |
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359 | |
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360 | glLoadIdentity(); |
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361 | gluOrtho2D(0, 1.0f, 0, 1.0f); |
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362 | |
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363 | glMatrixMode(GL_MODELVIEW); |
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364 | glLoadIdentity(); |
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365 | |
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366 | bindTexture(diff); |
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367 | |
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368 | glPushAttrib(GL_ENABLE_BIT); |
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369 | glEnable( GL_ALPHA_TEST ); |
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370 | glDisable( GL_CULL_FACE ); |
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371 | glAlphaFunc( GL_GREATER, 0.5 ); |
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372 | |
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373 | glEnable( GL_TEXTURE_2D ); |
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374 | glBegin(GL_QUADS); |
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375 | |
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376 | glTexCoord2f(0,0); |
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377 | glVertex3f(0,0,0); |
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378 | |
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379 | glTexCoord2f(1,0); |
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380 | glVertex3f( 1, 0, 0); |
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381 | |
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382 | glTexCoord2f(1,1); |
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383 | glVertex3f( 1, 1, 0); |
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384 | |
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385 | glTexCoord2f(0,1); |
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386 | glVertex3f(0, 1, 0); |
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387 | glEnd(); |
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388 | |
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389 | glPopAttrib(); |
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390 | |
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391 | // restore the projection matrix |
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392 | glMatrixMode(GL_PROJECTION); |
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393 | glPopMatrix(); |
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394 | glMatrixMode(GL_MODELVIEW); |
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395 | } |
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396 | |
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397 | return pErrorPixels; |
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398 | } |
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399 | |
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400 | |
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401 | bool |
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402 | GlRenderer::RenderScene() |
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403 | { |
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404 | static int glList = -1; |
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405 | if (glList != -1) { |
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406 | glCallList(glList); |
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407 | } else { |
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408 | glList = glGenLists(1); |
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409 | glNewList(glList, GL_COMPILE_AND_EXECUTE); |
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410 | ObjectContainer::const_iterator oi = mObjects.begin(); |
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411 | for (; oi != mObjects.end(); oi++) |
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412 | RenderIntersectable(*oi); |
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413 | glEndList(); |
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414 | } |
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415 | return true; |
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416 | } |
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417 | |
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418 | |
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419 | void |
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420 | GlRendererBuffer::ClearErrorBuffer() |
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421 | { |
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422 | for (int i=0; i < mPvsStatFrames; i++) { |
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423 | mPvsErrorBuffer[i] = 1.0f; |
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424 | } |
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425 | } |
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426 | |
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427 | |
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428 | void |
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429 | GlRendererBuffer::EvalPvsStat() |
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430 | { |
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431 | mPvsStat.Reset(); |
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432 | halton.Reset(); |
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433 | |
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434 | makeCurrent(); |
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435 | SetupProjection(GetWidth(), GetHeight()); |
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436 | |
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437 | for (int i=0; i < mPvsStatFrames; i++) { |
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438 | float err; |
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439 | RandomViewPoint(); |
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440 | if (mPvsErrorBuffer[i] > 0.0f) { |
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441 | mPvsErrorBuffer[i] = GetPixelError(); |
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442 | cout<<"("<<i<<","<<mPvsErrorBuffer[i]<<")"; |
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443 | // swapBuffers(); |
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444 | } |
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445 | |
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446 | err = mPvsErrorBuffer[i]; |
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447 | |
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448 | if (err >= 0.0f) { |
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449 | if (err > mPvsStat.maxError) |
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450 | mPvsStat.maxError = err; |
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451 | mPvsStat.sumError += err; |
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452 | if (err == 0.0f) |
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453 | mPvsStat.errorFreeFrames++; |
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454 | mPvsStat.frames++; |
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455 | } |
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456 | } |
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457 | |
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458 | doneCurrent(); |
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459 | |
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460 | cout<<endl<<flush; |
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461 | mRenderingFinished.wakeAll(); |
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462 | } |
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463 | |
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464 | |
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465 | |
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466 | |
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467 | |
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468 | void |
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469 | GlRendererWidget::mousePressEvent(QMouseEvent *e) |
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470 | { |
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471 | int x = e->pos().x(); |
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472 | int y = e->pos().y(); |
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473 | |
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474 | mousePoint.x = x; |
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475 | mousePoint.y = y; |
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476 | |
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477 | } |
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478 | |
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479 | void |
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480 | GlRendererWidget::mouseMoveEvent(QMouseEvent *e) |
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481 | { |
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482 | float MOVE_SENSITIVITY = Magnitude(mSceneGraph->GetBox().Diagonal())*1e-3; |
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483 | float TURN_SENSITIVITY=0.1f; |
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484 | float TILT_SENSITIVITY=32.0 ; |
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485 | float TURN_ANGLE= M_PI/36.0 ; |
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486 | |
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487 | int x = e->pos().x(); |
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488 | int y = e->pos().y(); |
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489 | |
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490 | if (e->modifiers() & Qt::ControlModifier) { |
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491 | mViewPoint.y += (y-mousePoint.y)*MOVE_SENSITIVITY/2.0; |
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492 | mViewPoint.x += (x-mousePoint.x)*MOVE_SENSITIVITY/2.0; |
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493 | } else { |
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494 | mViewPoint += mViewDirection*((mousePoint.y - y)*MOVE_SENSITIVITY); |
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495 | float adiff = TURN_ANGLE*(x - mousePoint.x)*-TURN_SENSITIVITY; |
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496 | float angle = atan2(mViewDirection.x, mViewDirection.z); |
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497 | mViewDirection.x = sin(angle+adiff); |
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498 | mViewDirection.z = cos(angle+adiff); |
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499 | } |
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500 | |
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501 | mousePoint.x = x; |
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502 | mousePoint.y = y; |
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503 | |
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504 | updateGL(); |
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505 | } |
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506 | |
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507 | void |
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508 | GlRendererWidget::mouseReleaseEvent(QMouseEvent *) |
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509 | { |
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510 | |
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511 | |
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512 | } |
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513 | |
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514 | void |
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515 | GlRendererWidget::resizeGL(int w, int h) |
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516 | { |
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517 | SetupProjection(w, h); |
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518 | updateGL(); |
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519 | } |
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520 | |
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521 | void |
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522 | GlRendererWidget::paintGL() |
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523 | { |
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524 | RenderErrors(); |
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525 | mFrame++; |
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526 | } |
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527 | |
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528 | |
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529 | void |
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530 | GlRendererWidget::SetupCamera() |
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531 | { |
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532 | if (!mTopView) |
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533 | GlRenderer::SetupCamera(); |
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534 | else { |
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535 | float dist = Magnitude(mSceneGraph->GetBox().Diagonal())*0.05; |
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536 | Vector3 pos = mViewPoint - dist*Vector3(mViewDirection.x, |
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537 | -1, |
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538 | mViewDirection.y); |
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539 | |
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540 | Vector3 target = mViewPoint + dist*mViewDirection; |
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541 | Vector3 up(0,1,0); |
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542 | |
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543 | glLoadIdentity(); |
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544 | gluLookAt(pos.x, pos.y, pos.z, |
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545 | target.x, target.y, target.z, |
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546 | up.x, up.y, up.z); |
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547 | } |
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548 | |
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549 | } |
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550 | |
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551 | void |
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552 | GlRendererWidget::keyPressEvent ( QKeyEvent * e ) |
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553 | { |
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554 | switch (e->key()) { |
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555 | case Qt::Key_T: |
---|
556 | mTopView = !mTopView; |
---|
557 | updateGL(); |
---|
558 | break; |
---|
559 | default: |
---|
560 | e->ignore(); |
---|
561 | break; |
---|
562 | } |
---|
563 | |
---|
564 | } |
---|
565 | |
---|
566 | |
---|
567 | void GlRendererBuffer::SampleBeamContributions(Intersectable *sourceObject, |
---|
568 | Beam &beam, |
---|
569 | const int desiredSamples, |
---|
570 | BeamSampleStatistics &stat) |
---|
571 | { |
---|
572 | // TODO: should be out of here |
---|
573 | cgGLBindProgram(sCgFragmentProgram);
|
---|
574 | cgGLEnableProfile(sCgFragmentProfile); |
---|
575 | |
---|
576 | // assumes that the beam is constructed and contains kd-tree nodes |
---|
577 | // and viewcells which it intersects |
---|
578 | |
---|
579 | |
---|
580 | |
---|
581 | |
---|
582 | // Get the number of viewpoints to be sampled |
---|
583 | // Now it is a sqrt but in general a wiser decision could be made. |
---|
584 | // The less viewpoints the better for rendering performance, since less passes |
---|
585 | // over the beam is needed. |
---|
586 | // The viewpoints could actually be generated outside of the bounding box which |
---|
587 | // would distribute the 'efective viewpoints' of the object surface and thus |
---|
588 | // with a few viewpoints better sample the vipoint space.... |
---|
589 | |
---|
590 | int viewPointSamples = sqrt((float)desiredSamples); |
---|
591 | |
---|
592 | // the number of direction samples per pass is given by the number of viewpoints |
---|
593 | int directionalSamples = desiredSamples/viewPointSamples; |
---|
594 | |
---|
595 | for (int i = 0; i < viewPointSamples; ++ i) |
---|
596 | { |
---|
597 | Vector3 viewPoint = beam.mBox.GetRandomPoint(); |
---|
598 | |
---|
599 | // perhaps the viewpoint should be shifted back a little bit so that it always lies |
---|
600 | // inside the source object |
---|
601 | // 'ideally' the viewpoints would be distributed on the soureObject surface, but this |
---|
602 | // would require more complicated sampling (perhaps hierarchical rejection sampling of |
---|
603 | // the object surface is an option here - only the mesh faces which are inside the box |
---|
604 | // are considered as candidates) |
---|
605 | |
---|
606 | SampleViewpointContributions(sourceObject, |
---|
607 | beam, |
---|
608 | directionalSamples, |
---|
609 | stat); |
---|
610 | } |
---|
611 | |
---|
612 | |
---|
613 | // note: |
---|
614 | // this routine would be called only if the number of desired samples is sufficiently |
---|
615 | // large - for other rss tree cells the cpu based sampling is perhaps more efficient |
---|
616 | // distributing the work between cpu and gpu would also allow us to place more sophisticated |
---|
617 | // sample distributions (silhouette ones) using the cpu and the jittered once on the GPU |
---|
618 | // in order that thios scheme is working well the gpu render buffer should run in a separate |
---|
619 | // thread than the cpu sampler, which would not be such a big problem.... |
---|
620 | |
---|
621 | cgGLDisableProfile(sCgFragmentProfile); |
---|
622 | } |
---|
623 | |
---|
624 | |
---|
625 | void GlRendererBuffer::SampleViewpointContributions(Intersectable *sourceObject, |
---|
626 | Beam &beam, |
---|
627 | const int desiredSamples, |
---|
628 | BeamSampleStatistics &stat) |
---|
629 | { |
---|
630 | // 1. setup the view port to match the desired samples |
---|
631 | // 2. setup the projection matrix and view matrix to match the viewpoint + beam.mDirBox |
---|
632 | |
---|
633 | // 3. reset z-buffer to 0 and render the source object for the beam using |
---|
634 | // glDepthFunc(GL_GREATER) |
---|
635 | // and glCullFace(Enabled) and glFrontFace(GL_CW) |
---|
636 | // save result to depth buffer? |
---|
637 | |
---|
638 | // bind ray origin depth buffer |
---|
639 | glClear(GL_DEPTH); |
---|
640 | glBindTexture(GL_TEXTURE_2D, depthMap);
|
---|
641 | glEnable(GL_TEXTURE_2D);
|
---|
642 |
|
---|
643 | // compare with second depth buffer: should be done in pixel shader
|
---|
644 | /*glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_COMPARE_R_TO_TEXTURE);
|
---|
645 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB, GL_GREATER);
|
---|
646 | glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE_ARB, GL_INTENSITY); |
---|
647 | */ |
---|
648 | |
---|
649 | |
---|
650 | // 4. set back to normal rendering and clear the ray termination depth buffer |
---|
651 | // 5. render all objects inside the beam using id based false color |
---|
652 | // (objects can be compiled to a gl list now so that subsequent rendering for |
---|
653 | // this beam is fast - the same hold for step 3) |
---|
654 | |
---|
655 | |
---|
656 | // 6. Now we have a two depth buffers defining the ray origin and termination |
---|
657 | // only rays which have non-zero entry in the origin buffer are valid since |
---|
658 | // they realy start on the object surface (this can also be tagged by setting a |
---|
659 | // stencil buffer bit at step 3) |
---|
660 | |
---|
661 | // 7. Use occlusion queries for all viewcell meshes associated with the beam -> |
---|
662 | // a fragment passes if the corresponding stencil fragment is set and its depth is |
---|
663 | // between origin and termination buffer |
---|
664 | |
---|
665 | // 8. The number of visible pixels is the number of sample rays which see the source |
---|
666 | // object from the corresponding viewcell -> rember these values for later update |
---|
667 | // of the viewcell pvs - or update immediatelly? |
---|
668 | |
---|
669 | // In general it is not neccessary to rember to extract all the rays cast. I hope it |
---|
670 | // would be sufficient to gain only the intergral statistics about the new contributions |
---|
671 | // and so the rss tree would actually store no new rays (only the initial ones) |
---|
672 | // the subdivision of the tree would only be driven by the statistics (the glrender could |
---|
673 | // evaluate the contribution entropy for example) |
---|
674 | // However might be an option to extract/store only those the rays which made a contribution |
---|
675 | // (new viewcell has been discovered) or relative contribution greater than a threashold ... |
---|
676 | |
---|
677 | } |
---|