1 | #include "RenderTraverser.h"
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2 | #include "glInterface.h"
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3 | #include "Camera.h"
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4 | #include "SceneEntity.h"
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5 | #include "RenderState.h"
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6 | #include "Geometry.h"
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7 | #include "Timer/PerfTimer.h"
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8 |
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9 |
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10 | using namespace std;
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11 |
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12 |
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13 | namespace CHCDemoEngine
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14 | {
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15 |
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16 |
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17 | void TraversalStatistics::Reset()
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18 | {
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19 | mNumTraversedNodes = 0;
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20 | mNumQueryCulledNodes = 0;
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21 | mNumFrustumCulledNodes = 0;
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22 |
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23 | mNumRenderedGeometry = 0;
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24 | mNumRenderedTriangles = 0;
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25 | mNumRenderedNodes = 0;
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26 |
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27 | mNumPreviouslyVisibleNodeQueries = 0;
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28 | mNumIssuedQueries = 0;
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29 | mNumStateChanges = 0;
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30 |
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31 | mRenderTime = 0;
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32 | }
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33 |
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34 |
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35 |
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36 | /******************************************************/
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37 | /* RenderTraverser implementation */
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38 | /******************************************************/
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39 |
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40 |
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41 | RenderTraverser::RenderTraverser():
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42 | mVisibilityThreshold(0),
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43 | mBvh(NULL),
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44 | mUseOptimization(false),
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45 | mFrameId(-1),
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46 | mUseRenderQueue(false),
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47 | mAssumedVisibleFrames(10),
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48 | mMaxBatchSize(50)
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49 | {
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50 | }
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51 |
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52 |
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53 | RenderTraverser::~RenderTraverser()
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54 | {
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55 | mQueryHandler.DestroyQueries();
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56 | }
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57 |
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58 |
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59 | void RenderTraverser::EnqueueNode(BvhNode *node)
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60 | {
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61 | mBvh->CalcDistance(node);
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62 | mDistanceQueue.push(node);
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63 | }
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64 |
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65 |
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66 | void RenderTraverser::TraverseNode(BvhNode *node)
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67 | {
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68 | ++ mStats.mNumTraversedNodes;
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69 |
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70 | if (node->IsVirtualLeaf())
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71 | {
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72 | RenderNode(node);
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73 | }
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74 | else
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75 | {
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76 | // for non leafs this renders only the bounding volume (if the flag is set)
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77 | BvhInterior *interior = static_cast<BvhInterior *>(node);
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78 |
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79 | EnqueueNode(interior->GetFront());
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80 | EnqueueNode(interior->GetBack());
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81 | }
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82 | }
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83 |
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84 |
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85 | void RenderTraverser::RenderNode(BvhNode *node)
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86 | {
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87 | if (node->GetLastRenderedFrame() != mFrameId)
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88 | {
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89 | if (mRenderState->SetState(RenderState::RENDER))
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90 | ++ mStats.mNumStateChanges;
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91 |
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92 | node->SetLastRenderedFrame(mFrameId);
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93 |
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94 | int geometrySize;
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95 | SceneEntity **entities = mBvh->GetGeometry(node, geometrySize);
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96 |
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97 | mStats.mNumRenderedGeometry += geometrySize;
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98 | ++ mStats.mNumRenderedNodes;
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99 |
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100 | for (int i = 0; i < geometrySize; ++ i)
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101 | {
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102 | SceneEntity *ent = entities[i];
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103 | mStats.mNumRenderedTriangles += ent->GetGeometry()->GetNumTriangles();
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104 |
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105 | if (mUseRenderQueue)
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106 | mRenderQueue.Enqueue(ent);
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107 | else
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108 | ent->Render(mRenderState);
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109 | }
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110 | }
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111 | }
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112 |
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113 |
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114 | void RenderTraverser::SetHierarchy(Bvh *bvh)
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115 | {
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116 | mBvh = bvh;
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117 | }
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118 |
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119 |
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120 | void RenderTraverser::SetRenderState(RenderState *state)
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121 | {
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122 | mRenderState = state;
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123 | mRenderQueue.SetRenderState(state);
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124 | }
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125 |
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126 |
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127 | void RenderTraverser::RenderScene()
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128 | {
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129 | PerfTimer timer;
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130 |
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131 | timer.Start();
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132 |
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133 | //InitTiming();
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134 | //long t1, t2;
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135 | //t1 = GetTime();
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136 |
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137 | glEnableClientState(GL_VERTEX_ARRAY);
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138 | glEnableClientState(GL_NORMAL_ARRAY);
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139 |
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140 | ++ mFrameId;
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141 |
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142 | mBvh->InitFrame();
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143 |
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144 | mStats.Reset();
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145 | mQueryHandler.ResetQueries();
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146 |
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147 | EnqueueNode(mBvh->GetRoot());
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148 |
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149 |
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150 | ///////////
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151 | //-- the actual rendering algorithm
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152 |
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153 | Traverse();
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154 |
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155 | mRenderState->Reset();
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156 |
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157 | glDisableClientState(GL_VERTEX_ARRAY);
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158 | glDisableClientState(GL_NORMAL_ARRAY);
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159 |
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160 | //t2 = GetTime();
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161 | //mStats.mRenderTime = TimeDiff(t1, t2);
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162 | mStats.mRenderTime = timer.Elapsedms();
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163 | }
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164 |
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165 |
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166 | void RenderTraverser::SetUseRenderQueue(bool useRenderQueue)
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167 | {
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168 | mUseRenderQueue = useRenderQueue;
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169 | std::cout << "using render queue: " << mUseRenderQueue << std::endl;
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170 | }
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171 |
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172 |
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173 | void RenderTraverser::SetVisibilityThreshold(int threshold)
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174 | {
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175 | mVisibilityThreshold = threshold;
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176 | }
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177 |
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178 |
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179 | void RenderTraverser::SetUseOptimization(bool useOptimization)
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180 | {
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181 | mUseOptimization = useOptimization;
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182 | }
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183 |
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184 |
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185 | void RenderTraverser::SetAssumedVisibleFrames(int assumedVisibleFrames)
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186 | {
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187 | mAssumedVisibleFrames = assumedVisibleFrames;
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188 | }
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189 |
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190 |
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191 | void RenderTraverser::SetMaxBatchSize(int batchSize)
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192 | {
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193 | mMaxBatchSize = batchSize;
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194 | }
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195 |
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196 |
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197 | void RenderTraverser::SetUseMultiQueries(bool useMultiQueries)
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198 | {
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199 | mUseMultiQueries = useMultiQueries;
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200 | std::cout << "using multiqueries: " << mUseMultiQueries << std::endl;
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201 | }
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202 |
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203 |
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204 |
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205 | OcclusionQuery *RenderTraverser::IssueOcclusionQuery(BvhNode *node, bool wasVisible)
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206 | {
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207 | OcclusionQuery *query = mQueryHandler.RequestQuery();
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208 | query->AddNode(node);
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209 |
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210 | IssueOcclusionQuery(*query, wasVisible);
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211 |
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212 | return query;
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213 | }
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214 |
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215 |
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216 | void RenderTraverser::IssueOcclusionQuery(const OcclusionQuery &query, bool wasVisible)
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217 | {
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218 | ++ mStats.mNumIssuedQueries;
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219 |
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220 | if (mUseRenderQueue && (mRenderState->GetMode() == RenderState::RENDER))
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221 | {
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222 | //cout << "render queue: " << mRenderQueue.GetSize() << endl;
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223 | mRenderQueue.Render();
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224 | mRenderQueue.Clear();
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225 | }
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226 |
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227 | query.BeginQuery();
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228 |
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229 | if (wasVisible)
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230 | ++ mStats.mNumPreviouslyVisibleNodeQueries;
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231 |
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232 | // if this node is a previous visible leaf:
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233 | // leaves will be rendered anyway => we can also test with the real geometry
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234 | if (wasVisible && mUseOptimization)
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235 | {
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236 | for (size_t i = 0; i < query.GetSize(); ++ i)
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237 | RenderNode(query.GetNodes()[i]);
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238 | }
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239 | else
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240 | {
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241 | // change to query mode and render box
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242 | if (mRenderState->SetState(RenderState::QUERY))
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243 | ++ mStats.mNumStateChanges;
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244 |
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245 | mBvh->RenderBoundingBoxes(query.GetNodes(), mRenderState);
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246 | }
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247 |
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248 | query.EndQuery();
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249 | }
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250 |
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251 |
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252 | }
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