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 | |
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8 | #include <GL/glext.h> |
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9 | |
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10 | GlRendererWidget *rendererWidget = NULL; |
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11 | |
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12 | #ifdef _WIN32 |
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13 | PFNGLGENOCCLUSIONQUERIESNVPROC glGenOcclusionQueriesNV; |
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14 | PFNGLBEGINOCCLUSIONQUERYNVPROC glBeginOcclusionQueryNV; |
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15 | PFNGLENDOCCLUSIONQUERYNVPROC glEndOcclusionQueryNV; |
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16 | PFNGLGETOCCLUSIONQUERYUIVNVPROC glGetOcclusionQueryuivNV; |
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17 | #endif |
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18 | |
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19 | GlRenderer::GlRenderer(SceneGraph *sceneGraph, |
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20 | ViewCellsManager *viewCellsManager): |
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21 | Renderer(sceneGraph, viewCellsManager) |
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22 | { |
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23 | mSceneGraph->CollectObjects(&mObjects); |
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24 | mViewPoint = mSceneGraph->GetBox().Center(); |
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25 | mViewDirection = Vector3(0,0,1); |
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26 | // timerId = startTimer(10); |
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27 | mFrame = 0; |
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28 | mWireFrame = false; |
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29 | } |
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30 | |
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31 | GlRenderer::~GlRenderer() |
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32 | { |
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33 | } |
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34 | |
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35 | void |
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36 | GlRenderer::RenderIntersectable(Intersectable *object) |
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37 | { |
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38 | |
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39 | SetupFalseColor(object->mId); |
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40 | |
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41 | switch (object->Type()) { |
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42 | case Intersectable::MESH_INSTANCE: |
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43 | RenderMeshInstance((MeshInstance *)object); |
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44 | break; |
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45 | default: |
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46 | cerr<<"Rendering this object not yet implemented\n"; |
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47 | break; |
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48 | } |
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49 | } |
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50 | |
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51 | |
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52 | void |
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53 | GlRenderer::RenderMeshInstance(MeshInstance *mi) |
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54 | { |
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55 | RenderMesh(mi->GetMesh()); |
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56 | } |
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57 | |
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58 | void |
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59 | GlRenderer::SetupFalseColor(const int id) |
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60 | { |
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61 | // swap bits of the color |
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62 | |
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63 | glColor3ub(id&255, (id>>8)&255, (id>>16)&255); |
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64 | } |
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65 | |
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66 | void |
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67 | GlRenderer::SetupMaterial(Material *m) |
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68 | { |
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69 | if (m) |
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70 | glColor3fv(&(m->mDiffuseColor.r)); |
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71 | else |
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72 | glColor3f(1.0f, 1.0f, 1.0f); |
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73 | } |
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74 | |
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75 | void |
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76 | GlRenderer::RenderMesh(Mesh *mesh) |
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77 | { |
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78 | int i = 0; |
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79 | |
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80 | if (!mUseFalseColors) |
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81 | SetupMaterial(mesh->mMaterial); |
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82 | |
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83 | for (i=0; i < mesh->mFaces.size(); i++) { |
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84 | if (mWireFrame) |
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85 | glBegin(GL_LINE_LOOP); |
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86 | else |
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87 | glBegin(GL_POLYGON); |
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88 | |
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89 | Face *face = mesh->mFaces[i]; |
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90 | for (int j = 0; j < face->mVertexIndices.size(); j++) { |
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91 | glVertex3fv(&mesh->mVertices[face->mVertexIndices[j]].x); |
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92 | } |
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93 | glEnd(); |
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94 | } |
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95 | } |
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96 | |
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97 | void |
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98 | GlRenderer::InitGL() |
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99 | { |
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100 | glMatrixMode(GL_PROJECTION); |
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101 | glLoadIdentity(); |
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102 | |
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103 | glMatrixMode(GL_MODELVIEW); |
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104 | glLoadIdentity(); |
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105 | |
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106 | glEnable(GL_CULL_FACE); |
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107 | glShadeModel(GL_FLAT); |
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108 | glEnable(GL_DEPTH_TEST); |
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109 | glEnable(GL_CULL_FACE); |
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110 | |
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111 | glGenOcclusionQueriesNV = (PFNGLGENOCCLUSIONQUERIESNVPROC) |
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112 | wglGetProcAddress("glGenOcclusionQueriesNV"); |
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113 | glBeginOcclusionQueryNV = (PFNGLBEGINOCCLUSIONQUERYNVPROC) |
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114 | wglGetProcAddress("glBeginOcclusionQueryNV"); |
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115 | glEndOcclusionQueryNV = (PFNGLENDOCCLUSIONQUERYNVPROC) |
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116 | wglGetProcAddress("glEndOcclusionQueryNV"); |
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117 | glGetOcclusionQueryuivNV = (PFNGLGETOCCLUSIONQUERYUIVNVPROC) |
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118 | wglGetProcAddress("glGetOcclusionQueryuivNV"); |
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119 | } |
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120 | |
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121 | |
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122 | |
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123 | void |
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124 | GlRenderer::SetupProjection(const int w, const int h) |
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125 | { |
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126 | glViewport(0, 0, w, h); |
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127 | glMatrixMode(GL_PROJECTION); |
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128 | glLoadIdentity(); |
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129 | gluPerspective(70.0, 1.0, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal())); |
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130 | glMatrixMode(GL_MODELVIEW); |
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131 | } |
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132 | |
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133 | void |
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134 | GlRenderer::SetupCamera() |
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135 | { |
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136 | Vector3 target = mViewPoint + mViewDirection; |
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137 | Vector3 up(0,1,0); |
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138 | |
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139 | glLoadIdentity(); |
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140 | gluLookAt(mViewPoint.x, mViewPoint.y, mViewPoint.z, |
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141 | target.x, target.y, target.z, |
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142 | up.x, up.y, up.z); |
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143 | } |
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144 | |
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145 | void |
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146 | GlRenderer::RandomViewPoint() |
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147 | { |
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148 | Vector3 pVector = Vector3(halton.GetNumber(1), |
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149 | halton.GetNumber(2), |
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150 | halton.GetNumber(3)); |
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151 | |
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152 | Vector3 dVector = Vector3(2*M_PI*halton.GetNumber(4), |
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153 | M_PI*halton.GetNumber(5), |
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154 | 0.0f); |
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155 | |
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156 | mViewPoint = mSceneGraph->GetBox().GetPoint(pVector); |
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157 | |
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158 | mViewDirection = Normalize(Vector3(sin(dVector.x), |
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159 | // cos(dVector.y), |
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160 | 0.0f, |
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161 | cos(dVector.x))); |
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162 | |
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163 | halton.GenerateNext(); |
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164 | } |
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165 | |
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166 | |
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167 | float |
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168 | GlRenderer::GetPixelError() |
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169 | { |
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170 | float pErrorPixels = -1.0f; |
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171 | |
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172 | glReadBuffer(GL_BACK); |
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173 | |
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174 | mUseFalseColors = true; |
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175 | |
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176 | SetupCamera(); |
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177 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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178 | glEnable( GL_CULL_FACE ); |
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179 | |
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180 | RenderScene(); |
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181 | |
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182 | // now check whether any backfacing polygon would pass the depth test |
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183 | static int query = -1; |
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184 | if (query == -1) |
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185 | glGenOcclusionQueriesNV(1, (unsigned int *)&query); |
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186 | |
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187 | glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); |
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188 | glDepthMask(GL_FALSE); |
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189 | glDisable( GL_CULL_FACE ); |
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190 | |
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191 | glBeginOcclusionQueryNV(query); |
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192 | |
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193 | RenderScene(); |
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194 | |
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195 | glEndOcclusionQueryNV(); |
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196 | |
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197 | // at this point, if possible, go and do some other computation |
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198 | glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); |
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199 | glDepthMask(GL_TRUE); |
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200 | glEnable( GL_CULL_FACE ); |
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201 | |
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202 | unsigned int pixelCount; |
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203 | // reenable other state |
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204 | glGetOcclusionQueryuivNV(query, |
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205 | GL_PIXEL_COUNT_NV, |
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206 | &pixelCount); |
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207 | |
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208 | if (pixelCount > 0) |
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209 | return -1.0f; // backfacing polygon found -> not a valid viewspace sample |
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210 | |
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211 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint); |
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212 | |
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213 | if (viewcell) { |
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214 | SetupCamera(); |
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215 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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216 | |
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217 | // Render PVS |
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218 | std::map<Intersectable *, |
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219 | PvsData<Intersectable *>, |
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220 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin(); |
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221 | |
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222 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) { |
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223 | Intersectable *object = (*it).first; |
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224 | RenderIntersectable(object); |
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225 | } |
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226 | |
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227 | glBeginOcclusionQueryNV(query); |
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228 | |
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229 | SetupCamera(); |
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230 | |
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231 | RenderScene(); |
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232 | |
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233 | glEndOcclusionQueryNV(); |
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234 | |
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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 | pErrorPixels = (100.f*pixelCount)/(GetWidth()*GetHeight()); |
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243 | } |
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244 | |
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245 | return pErrorPixels; |
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246 | } |
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247 | |
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248 | |
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249 | float |
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250 | GlRendererWidget::RenderErrors() |
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251 | { |
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252 | float pErrorPixels = -1.0f; |
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253 | |
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254 | glReadBuffer(GL_BACK); |
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255 | |
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256 | mUseFalseColors = true; |
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257 | |
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258 | SetupCamera(); |
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259 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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260 | glEnable( GL_CULL_FACE ); |
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261 | |
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262 | ObjectContainer::const_iterator oi = mObjects.begin(); |
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263 | for (; oi != mObjects.end(); oi++) |
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264 | RenderIntersectable(*oi); |
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265 | |
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266 | ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint); |
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267 | |
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268 | QImage im1, im2; |
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269 | QImage diff; |
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270 | |
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271 | if (viewcell) { |
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272 | // read back the texture |
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273 | im1 = grabFrameBuffer(true); |
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274 | |
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275 | SetupCamera(); |
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276 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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277 | |
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278 | std::map<Intersectable *, |
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279 | PvsData<Intersectable *>, |
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280 | LtSample<Intersectable *> >::const_iterator it = viewcell->GetPvs().mEntries.begin(); |
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281 | |
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282 | for (; it != viewcell->GetPvs().mEntries.end(); ++ it) { |
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283 | Intersectable *object = (*it).first; |
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284 | RenderIntersectable(object); |
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285 | } |
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286 | |
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287 | // read back the texture |
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288 | im2 = grabFrameBuffer(true); |
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289 | |
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290 | diff = im1; |
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291 | int x, y; |
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292 | int errorPixels = 0; |
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293 | |
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294 | for (y = 0; y < im1.height(); y++) |
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295 | for (x = 0; x < im1.width(); x++) |
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296 | if (im1.pixel(x, y) == im2.pixel(x, y)) |
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297 | diff.setPixel(x, y, qRgba(0,0,0,0)); |
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298 | else { |
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299 | diff.setPixel(x, y, qRgba(255,128,128,255)); |
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300 | errorPixels++; |
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301 | } |
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302 | pErrorPixels = (100.f*errorPixels)/(im1.height()*im1.width()); |
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303 | } |
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304 | |
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305 | // now render the pvs again |
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306 | SetupCamera(); |
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307 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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308 | mUseFalseColors = false; |
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309 | |
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310 | oi = mObjects.begin(); |
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311 | for (; oi != mObjects.end(); oi++) |
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312 | RenderIntersectable(*oi); |
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313 | |
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314 | // now render im1 |
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315 | if (viewcell) { |
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316 | if (mTopView) { |
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317 | mWireFrame = true; |
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318 | RenderMeshInstance(viewcell); |
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319 | mWireFrame = false; |
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320 | } |
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321 | |
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322 | // init ortographic projection |
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323 | glMatrixMode(GL_PROJECTION); |
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324 | glPushMatrix(); |
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325 | |
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326 | glLoadIdentity(); |
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327 | gluOrtho2D(0, 1.0f, 0, 1.0f); |
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328 | |
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329 | glMatrixMode(GL_MODELVIEW); |
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330 | glLoadIdentity(); |
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331 | |
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332 | bindTexture(diff); |
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333 | |
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334 | glPushAttrib(GL_ENABLE_BIT); |
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335 | glEnable( GL_ALPHA_TEST ); |
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336 | glDisable( GL_CULL_FACE ); |
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337 | glAlphaFunc( GL_GREATER, 0.5 ); |
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338 | |
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339 | glEnable( GL_TEXTURE_2D ); |
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340 | glBegin(GL_QUADS); |
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341 | |
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342 | glTexCoord2f(0,0); |
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343 | glVertex3f(0,0,0); |
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344 | |
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345 | glTexCoord2f(1,0); |
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346 | glVertex3f( 1, 0, 0); |
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347 | |
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348 | glTexCoord2f(1,1); |
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349 | glVertex3f( 1, 1, 0); |
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350 | |
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351 | glTexCoord2f(0,1); |
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352 | glVertex3f(0, 1, 0); |
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353 | glEnd(); |
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354 | |
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355 | glPopAttrib(); |
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356 | |
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357 | // restore the projection matrix |
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358 | glMatrixMode(GL_PROJECTION); |
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359 | glPopMatrix(); |
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360 | glMatrixMode(GL_MODELVIEW); |
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361 | } |
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362 | |
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363 | return pErrorPixels; |
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364 | } |
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365 | |
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366 | |
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367 | bool |
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368 | GlRenderer::RenderScene() |
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369 | { |
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370 | static int glList = -1; |
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371 | if (glList != -1) { |
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372 | glCallList(glList); |
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373 | } else { |
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374 | glList = glGenLists(1); |
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375 | glNewList(glList, GL_COMPILE_AND_EXECUTE); |
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376 | ObjectContainer::const_iterator oi = mObjects.begin(); |
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377 | for (; oi != mObjects.end(); oi++) |
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378 | RenderIntersectable(*oi); |
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379 | glEndList(); |
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380 | } |
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381 | return true; |
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382 | } |
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383 | |
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384 | |
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385 | void |
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386 | GlRendererBuffer::ClearErrorBuffer() |
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387 | { |
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388 | for (int i=0; i < mPvsStatFrames; i++) { |
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389 | mPvsErrorBuffer[i] = 1.0f; |
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390 | } |
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391 | } |
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392 | |
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393 | |
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394 | void |
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395 | GlRendererBuffer::EvalPvsStat() |
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396 | { |
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397 | mPvsStat.Reset(); |
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398 | halton.Reset(); |
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399 | |
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400 | makeCurrent(); |
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401 | SetupProjection(GetWidth(), GetHeight()); |
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402 | |
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403 | for (int i=0; i < mPvsStatFrames; i++) { |
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404 | float err; |
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405 | RandomViewPoint(); |
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406 | if (mPvsErrorBuffer[i] > 0.0f) { |
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407 | mPvsErrorBuffer[i] = GetPixelError(); |
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408 | cout<<"("<<i<<","<<mPvsErrorBuffer[i]<<")"; |
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409 | // swapBuffers(); |
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410 | } |
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411 | |
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412 | err = mPvsErrorBuffer[i]; |
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413 | |
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414 | if (err >= 0.0f) { |
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415 | if (err > mPvsStat.maxError) |
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416 | mPvsStat.maxError = err; |
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417 | mPvsStat.sumError += err; |
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418 | if (err == 0.0f) |
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419 | mPvsStat.errorFreeFrames++; |
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420 | mPvsStat.frames++; |
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421 | } |
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422 | } |
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423 | |
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424 | doneCurrent(); |
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425 | |
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426 | cout<<endl<<flush; |
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427 | mRenderingFinished.wakeAll(); |
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428 | } |
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429 | |
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430 | |
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431 | |
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432 | |
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433 | |
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434 | void |
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435 | GlRendererWidget::mousePressEvent(QMouseEvent *e) |
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436 | { |
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437 | int x = e->pos().x(); |
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438 | int y = e->pos().y(); |
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439 | |
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440 | mousePoint.x = x; |
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441 | mousePoint.y = y; |
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442 | |
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443 | } |
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444 | |
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445 | void |
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446 | GlRendererWidget::mouseMoveEvent(QMouseEvent *e) |
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447 | { |
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448 | float MOVE_SENSITIVITY = Magnitude(mSceneGraph->GetBox().Diagonal())*1e-3; |
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449 | float TURN_SENSITIVITY=0.1f; |
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450 | float TILT_SENSITIVITY=32.0 ; |
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451 | float TURN_ANGLE= M_PI/36.0 ; |
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452 | |
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453 | int x = e->pos().x(); |
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454 | int y = e->pos().y(); |
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455 | |
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456 | if (e->modifiers() & Qt::ControlModifier) { |
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457 | mViewPoint.y += (y-mousePoint.y)*MOVE_SENSITIVITY/2.0; |
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458 | mViewPoint.x += (x-mousePoint.x)*MOVE_SENSITIVITY/2.0; |
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459 | } else { |
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460 | mViewPoint += mViewDirection*((mousePoint.y - y)*MOVE_SENSITIVITY); |
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461 | float adiff = TURN_ANGLE*(x - mousePoint.x)*-TURN_SENSITIVITY; |
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462 | float angle = atan2(mViewDirection.x, mViewDirection.z); |
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463 | mViewDirection.x = sin(angle+adiff); |
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464 | mViewDirection.z = cos(angle+adiff); |
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465 | } |
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466 | |
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467 | mousePoint.x = x; |
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468 | mousePoint.y = y; |
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469 | |
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470 | updateGL(); |
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471 | } |
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472 | |
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473 | void |
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474 | GlRendererWidget::mouseReleaseEvent(QMouseEvent *) |
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475 | { |
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476 | |
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477 | |
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478 | } |
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479 | |
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480 | void |
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481 | GlRendererWidget::resizeGL(int w, int h) |
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482 | { |
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483 | SetupProjection(w, h); |
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484 | updateGL(); |
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485 | } |
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486 | |
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487 | void |
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488 | GlRendererWidget::paintGL() |
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489 | { |
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490 | RenderErrors(); |
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491 | mFrame++; |
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492 | } |
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493 | |
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494 | |
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495 | void |
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496 | GlRendererWidget::SetupCamera() |
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497 | { |
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498 | if (!mTopView) |
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499 | GlRenderer::SetupCamera(); |
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500 | else { |
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501 | float dist = Magnitude(mSceneGraph->GetBox().Diagonal())*0.05; |
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502 | Vector3 pos = mViewPoint - dist*Vector3(mViewDirection.x, |
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503 | -1, |
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504 | mViewDirection.y); |
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505 | |
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506 | Vector3 target = mViewPoint + dist*mViewDirection; |
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507 | Vector3 up(0,1,0); |
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508 | |
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509 | glLoadIdentity(); |
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510 | gluLookAt(pos.x, pos.y, pos.z, |
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511 | target.x, target.y, target.z, |
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512 | up.x, up.y, up.z); |
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513 | } |
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514 | |
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515 | } |
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516 | |
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517 | void |
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518 | GlRendererWidget::keyPressEvent ( QKeyEvent * e ) |
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519 | { |
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520 | switch (e->key()) { |
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521 | case Qt::Key_T: |
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522 | mTopView = !mTopView; |
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523 | updateGL(); |
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524 | break; |
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525 | default: |
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526 | e->ignore(); |
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527 | break; |
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528 | } |
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529 | |
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530 | } |
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