1 | #include "OgreOcclusionCullingSceneTraverser.h"
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2 | #include "OgreMath.h"
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3 | #include "OgreIteratorWrappers.h"
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4 | #include "OgreCamera.h"
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5 | #include "OgreHardwareOcclusionQuery.h"
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6 | #include "OgreSolidHalfBoundingBox.h"
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7 |
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8 |
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9 | #include <windows.h>
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10 |
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11 | namespace Ogre {
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12 |
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13 | //-----------------------------------------------------------------------
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14 | OcclusionCullingSceneTraverser::OcclusionCullingSceneTraverser(SceneManager *sm, RenderSystem *rsys):
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15 | mFrameId(1), mDistanceQueue(NULL), mVisibilityThreshold(0), mCurrentTestIdx(0),
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16 | mQueryMode(MODE_RENDER), mNumSceneNodes(0), mCurrentAlgorithm(RENDER_COHERENT),
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17 | mNumQueries(0), mNumTraversedNodes(0), mNumQueryCulledNodes(0), mNumFrustumCulledNodes(0),
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18 | mNumRenderedNodes(0),mNumRenderedGeometry(0), mSceneManager(sm), mRenderSystem(rsys), mSceneRoot(NULL)
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19 | {
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20 | mHalfBoundingBox[0] = mHalfBoundingBox[1] = 0;
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21 | }
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22 | //-----------------------------------------------------------------------
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23 | OcclusionCullingSceneTraverser::~OcclusionCullingSceneTraverser()
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24 | {
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25 | if(mHalfBoundingBox[0]) delete mHalfBoundingBox[0];
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26 | if(mHalfBoundingBox[1]) delete mHalfBoundingBox[1];
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27 |
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28 | deleteQueries();
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29 |
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30 | if(mDistanceQueue)
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31 | delete mDistanceQueue;
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32 | //SceneManager::~SceneManager();
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33 | }
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34 | //-----------------------------------------------------------------------
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35 | void OcclusionCullingSceneTraverser::renderScene( Camera *cam )
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36 | {
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37 | mNumTraversedNodes = 0; |
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38 | mNumQueryCulledNodes = 0; |
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39 | mNumFrustumCulledNodes = 0; |
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40 | mNumRenderedGeometry = 0;
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41 | mNumRenderedNodes = 0;
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42 |
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43 | mCurrentTestIdx = 0;
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44 |
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45 | initDistanceQueue(cam);
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46 |
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47 | switch(mCurrentAlgorithm) |
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48 | { |
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49 | case RENDER_CULL_FRUSTUM: |
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50 | renderCullFrustum(cam); |
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51 | break; |
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52 | case RENDER_STOP_AND_WAIT: |
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53 | renderStopAndWait(cam); |
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54 | break; |
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55 | case RENDER_COHERENT: |
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56 | renderCoherentWithQueue(cam); |
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57 | break; |
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58 | default: |
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59 | renderCullFrustum(cam); |
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60 | break; |
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61 | }
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62 |
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63 | mFrameId ++;
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64 | }
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65 | //-----------------------------------------------------------------------
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66 | void OcclusionCullingSceneTraverser::renderCoherentWithQueue(Camera *cam) |
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67 | { |
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68 | QueryQueue queryQueue; |
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69 | |
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70 | //-- PART 1: process finished occlusion queries |
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71 | while(!mDistanceQueue->empty() || !queryQueue.empty()) |
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72 | { |
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73 | |
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74 | SceneNode *node = queryQueue.front().first; |
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75 | HardwareOcclusionQuery *query = queryQueue.front().second; |
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76 | |
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77 | queryQueue.pop(); |
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78 | |
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79 | // wait until result available |
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80 | unsigned int visiblePixels; |
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81 | query->pullOcclusionQuery(&visiblePixels); |
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82 | |
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83 | if(visiblePixels > mVisibilityThreshold) |
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84 | { |
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85 | pullUpVisibility(node); |
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86 | traverseNode(cam, node); |
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87 | } |
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88 | else |
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89 | { |
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90 | mNumQueryCulledNodes ++; |
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91 | } |
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92 | } |
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93 | |
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94 | //-- PART 2: hierarchical traversal |
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95 | if(!mDistanceQueue->empty()) |
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96 | { |
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97 | SceneNode *node = mDistanceQueue->top(); |
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98 | mDistanceQueue->pop(); |
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99 | |
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100 | bool intersects = false; |
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101 | //TODO: Isvisible also checked inside scenenode::findvisibleobjects |
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102 | if(!cam->isVisible(node->_getWorldAABB(), intersects)) |
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103 | { |
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104 | mNumFrustumCulledNodes ++; |
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105 | continue; |
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106 | } |
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107 | |
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108 | // if intersects near plane => skip occlusion query because wrong results possible |
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109 | if(intersects) |
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110 | { |
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111 | // update node's visited flag |
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112 | node->setLastVisited(mFrameId); |
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113 | pullUpVisibility(node); |
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114 | traverseNode(cam, node); |
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115 | |
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116 | continue; |
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117 | } |
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118 | |
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119 | // identify previously visible nodes |
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120 | bool wasVisible = node->isNodeVisible() && (node->lastVisited() == mFrameId - 1); |
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121 | |
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122 | // identify nodes that we cannot skip queries for |
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123 | bool mustQuery= !wasVisible || (node->numAttachedObjects() > 0) || isLeaf(node); |
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124 | |
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125 | // reset node's visibility classification |
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126 | node->setNodeVisible(false); |
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127 | |
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128 | // update node's visited flag |
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129 | node->setLastVisited(mFrameId); |
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130 | |
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131 | // skip testing previously visible interior nodes without geometry |
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132 | if(mustQuery) |
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133 | { |
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134 | HardwareOcclusionQuery *query = issueOcclusionQuery(&node->_getWorldAABB(), wasVisible); |
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135 | queryQueue.push(QueryPair(node, query)); |
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136 | } |
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137 | |
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138 | // always traverse a node if it was visible |
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139 | if(wasVisible) |
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140 | { |
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141 | traverseNode(cam, node); |
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142 | } |
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143 | else |
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144 | { |
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145 | mNumFrustumCulledNodes ++; |
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146 | } |
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147 | } |
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148 | } |
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149 | }
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150 | //-----------------------------------------------------------------------
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151 | void OcclusionCullingSceneTraverser::renderCullFrustum(Camera *cam)
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152 | {
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153 | while(!mDistanceQueue->empty()) |
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154 | { |
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155 | SceneNode *node = mDistanceQueue->top(); |
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156 | mDistanceQueue->pop(); |
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157 | |
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158 | // interesting for visualization purpose |
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159 | node->setNodeVisible(false); |
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160 | |
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161 | //TODO: IsVisible also checked inside scenenode::_findvisibleobjects |
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162 | if(!cam->isVisible(node->_getWorldAABB())) |
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163 | { |
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164 | mNumFrustumCulledNodes ++; |
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165 | continue; |
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166 | } |
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167 | |
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168 | // update node's visited flag |
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169 | node->setLastVisited(mFrameId); |
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170 | node->setNodeVisible(true); |
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171 | traverseNode(cam, node); |
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172 | }
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173 | }
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174 | //-----------------------------------------------------------------------
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175 | void OcclusionCullingSceneTraverser::renderStopAndWait(Camera *cam) |
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176 | { |
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177 | while(!mDistanceQueue->empty()) |
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178 | { |
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179 | SceneNode *node = mDistanceQueue->top(); |
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180 | mDistanceQueue->pop(); |
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181 | |
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182 | // interesting for the visualization |
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183 | node->setNodeVisible(false); |
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184 | node->setLastVisited(mFrameId); |
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185 | |
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186 | bool intersects = false; |
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187 | //TODO: Isvisible also checked inside scenenode::findvisibleobjects |
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188 | if(!cam->isVisible(node->_getWorldAABB(), intersects)) |
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189 | { |
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190 | mNumFrustumCulledNodes ++; |
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191 | continue; |
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192 | } |
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193 | |
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194 | // if intersects near plane => skip occlusion query because wrong results possible |
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195 | if(intersects) |
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196 | { |
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197 | node->setNodeVisible(true); |
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198 | traverseNode(cam, node); |
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199 | |
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200 | continue; |
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201 | } |
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202 | |
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203 | HardwareOcclusionQuery *query = issueOcclusionQuery(&node->_getWorldAABB(), false); |
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204 | |
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205 | unsigned int visiblePixels; |
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206 | // wait if result not available |
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207 | query->pullOcclusionQuery(&visiblePixels); |
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208 | |
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209 | // node visible |
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210 | if(visiblePixels > mVisibilityThreshold) |
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211 | { |
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212 | node->setNodeVisible(true); |
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213 | traverseNode(cam, node); |
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214 | } |
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215 | else |
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216 | { |
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217 | mNumQueryCulledNodes ++; |
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218 | } |
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219 | } |
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220 | } |
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221 | //----------------------------------------------------------------------- |
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222 | HardwareOcclusionQuery *OcclusionCullingSceneTraverser::issueOcclusionQuery( |
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223 | AxisAlignedBox *box, bool wasVisible ) |
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224 | { |
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225 | // change state so the bounding box gets not actually rendered on the screen |
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226 | // TODO: in rendervisibleobjects, the rendermode is changed by ogre itself => change this!! |
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227 | |
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228 | //setRenderingMode(MODE_QUERY); |
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229 | //mRenderSystem->_setRasterisationMode(SDL_SOLID); setRenderingMode(MODE_RENDER);
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230 |
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231 | // get next available test id |
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232 | HardwareOcclusionQuery *query = getNextOcclusionQuery(); |
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233 | |
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234 | //-- the actual query test |
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235 | query->beginOcclusionQuery(); |
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236 |
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237 | renderBoundingBox(box);
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238 |
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239 | query->endOcclusionQuery();
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240 |
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241 | /*mRenderSystem->_setRasterisationMode(SDL_WIREFRAME);
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242 | setRenderingMode(MODE_RENDER);
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243 | renderBoundingBox(box);
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244 | mRenderSystem->_setRasterisationMode(SDL_SOLID);*/
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245 |
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246 | return query;
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247 | }
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248 | //-----------------------------------------------------------------------
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249 | void OcclusionCullingSceneTraverser::setRenderingMode( int mode ) |
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250 | { |
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251 | // avoid unnecessary state changes |
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252 | if(mode != mQueryMode) |
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253 | { |
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254 | mQueryMode = mode; |
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255 | bool enabled = (mode == MODE_RENDER); |
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256 | |
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257 | //if(mode == MODE_RENDER) return; |
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258 | |
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259 | /* |
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260 | mRenderSystem->_setRasterisationMode(SDL_SOLID); |
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261 | mRenderSystem->_setSurfaceParams(ColourValue(0.9, 0.2, 0.2),
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262 | ColourValue(0.2, 0.2, 0.2), ColourValue(0.2, 0.2, 0.2),
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263 | ColourValue(0, 0, 0), Real(100));
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264 | mRenderSystem->_setDepthBufferCheckEnabled(false); |
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265 | mRenderSystem->_setAlphaRejectSettings(CMPF_ALWAYS_PASS, 255);
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266 | */
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267 |
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268 | mRenderSystem->_setColourBufferWriteEnabled(enabled, enabled, enabled, enabled); |
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269 | mRenderSystem->_setDepthBufferWriteEnabled(enabled); |
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270 | //mRenderSystem->setLightingEnabled(enabled); |
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271 | } |
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272 | }
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273 | //-----------------------------------------------------------------------
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274 | void OcclusionCullingSceneTraverser::traverseNode( Camera *cam, SceneNode *node )
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275 | {
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276 | mNumTraversedNodes ++;
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277 |
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278 | if(node->numAttachedObjects() > 0)
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279 | {
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280 | renderSceneNode(cam, node);
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281 | }
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282 |
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283 | // internal node: add children to priority queue for further processing
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284 | Node::ChildNodeIterator it = node->getChildIterator();
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285 |
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286 | while (it.hasMoreElements())
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287 | {
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288 | SceneNode* sceneChild = static_cast<SceneNode*>(it.getNext());
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289 | mDistanceQueue->push(sceneChild);
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290 | }
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291 | }
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292 | //-----------------------------------------------------------------------
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293 | void OcclusionCullingSceneTraverser::renderSceneNode( Camera *cam, SceneNode *node )
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294 | {
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295 | //TODO: does not do any changes
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296 | //setRenderingMode(MODE_RENDER);
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297 |
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298 | if(node->lastRendered() != node->lastVisited())
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299 | {
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300 | node->setLastRendered(node->lastVisited());
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301 | mNumRenderedNodes ++;
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302 |
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303 | mSceneManager->_renderSceneNode(cam, node);
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304 | }
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305 | }
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306 | //-----------------------------------------------------------------------
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307 | /* void OcclusionCullingSceneTraverser::preprocess( void )
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308 | {
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309 | //-- initialise occlusion queries.
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310 | deleteQueries();
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311 |
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312 | for(unsigned int i=0; i < mNumQueries; i++)
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313 | {
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314 | mOcclusionQueries.push_back(mRenderSystem->createHardwareOcclusionQuery());
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315 | }
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316 | }*/
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317 | //-----------------------------------------------------------------------
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318 | void OcclusionCullingSceneTraverser::setSceneManager( SceneManager *sm )
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319 | {
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320 | mSceneManager = sm;
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321 | }
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322 | //-----------------------------------------------------------------------
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323 | void OcclusionCullingSceneTraverser::setRenderSystem( RenderSystem *rsys )
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324 | {
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325 | mRenderSystem = rsys;
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326 | }
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327 | //-----------------------------------------------------------------------
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328 | /*unsigned int OcclusionCullingSceneManager::countSceneNodes(SceneNode *node)
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329 | {
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330 | unsigned int result = 1;
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331 |
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332 | Node::ChildNodeIterator it = node->getChildIterator();
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333 |
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334 | while (it.hasMoreElements())
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335 | {
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336 | SceneNode* sceneChild = static_cast<SceneNode*>(it.getNext());
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337 | result += countSceneNodes(sceneChild);
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338 | }
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339 |
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340 | return result;
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341 | }*/
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342 | //-----------------------------------------------------------------------
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343 | bool OcclusionCullingSceneTraverser::isLeaf( SceneNode *node )
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344 | {
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345 | return (node->numChildren() == 0);
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346 | }
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347 | //-----------------------------------------------------------------------
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348 | void OcclusionCullingSceneTraverser::pullUpVisibility(SceneNode *node )
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349 | {
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350 | while(node && !node->isNodeVisible()) |
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351 | { |
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352 | node->setNodeVisible(true); |
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353 | node = node->getParentSceneNode(); |
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354 | }
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355 | }
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356 | //-----------------------------------------------------------------------
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357 | void OcclusionCullingSceneTraverser::deleteQueries( void )
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358 | {
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359 | for(unsigned int i=0; i < (unsigned int)mOcclusionQueries.size(); ++i)
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360 | delete mOcclusionQueries[i];
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361 |
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362 | mOcclusionQueries.clear();
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363 | }
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364 | //-----------------------------------------------------------------------
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365 | void OcclusionCullingSceneTraverser::renderBoundingBox( AxisAlignedBox *box )
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366 | {
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367 | // Render two halfes of the bounding box (using triangle fans)
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368 | for(int half = 0; half < 2; half ++)
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369 | {
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370 | static Matrix4 xform[256];
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371 | //TODO: this should be full bounding box
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372 | SolidHalfBoundingBox *halfbox = getSolidHalfBoundingBox(half);
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373 | halfbox->setupBoundingBox(*box);
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374 |
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375 | /*mRenderSystem->_setWorldMatrix(Matrix4::IDENTITY); |
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376 | |
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377 | halfbox->getWorldTransforms(xform); |
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378 | |
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379 | int numMatrices = halfbox->getNumWorldTransforms(); |
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380 | if (numMatrices > 1) |
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381 | { |
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382 | mRenderSystem->_setWorldMatrices(xform, numMatrices); |
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383 | } |
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384 | else |
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385 | { |
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386 | mRenderSystem->_setWorldMatrix(*xform); |
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387 | } |
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388 | mRenderSystem->setClipPlanes(halfbox->getClipPlanes()); |
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389 | |
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390 | static RenderOperation ro; |
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391 | |
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392 | mSceneManager->useRenderableViewProjMode(halfbox);
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393 | halfbox->getRenderOperation(ro);
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394 | ro.srcRenderable = halfbox;
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395 | mRenderSystem->_render(ro);*/
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396 |
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397 | mSceneManager->myrenderSingleObject(getSolidHalfBoundingBox(half),
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398 | getSolidHalfBoundingBox(half)->getTechnique()->getPass(0), true);
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399 | }
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400 | }
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401 | //-----------------------------------------------------------------------
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402 | SolidHalfBoundingBox *OcclusionCullingSceneTraverser::getSolidHalfBoundingBox( int half )
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403 | {
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404 | if(!mHalfBoundingBox[half])
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405 | mHalfBoundingBox[half] = new SolidHalfBoundingBox(half == 1);
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406 |
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407 | return mHalfBoundingBox[half];
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408 | }
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409 | //-----------------------------------------------------------------------
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410 | void OcclusionCullingSceneTraverser::setNumSceneNodes(int num)
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411 | {
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412 | mNumSceneNodes = num;
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413 | }
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414 | //-----------------------------------------------------------------------
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415 | /*void OcclusionCullingSceneTraverser::setNumQueries(int num)
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416 | {
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417 | mNumQueries = num;
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418 | }*/
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419 | //-----------------------------------------------------------------------
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420 | void OcclusionCullingSceneTraverser::setSceneRoot(SceneNode *root)
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421 | {
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422 | mSceneRoot = root;
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423 | }
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424 | //-----------------------------------------------------------------------
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425 | void OcclusionCullingSceneTraverser::initDistanceQueue(Camera *cam)
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426 | {
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427 | mDistanceQueue = new PriorityQueue(myless<SceneNode *>(cam));
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428 | mDistanceQueue->push(mSceneRoot);
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429 | }
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430 | //-----------------------------------------------------------------------
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431 | HardwareOcclusionQuery *OcclusionCullingSceneTraverser::getNextOcclusionQuery(void)
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432 | {
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433 | if(mCurrentTestIdx == mOcclusionQueries.size())
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434 | {
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435 | mOcclusionQueries.push_back(mRenderSystem->createHardwareOcclusionQuery());
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436 | }
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437 |
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438 | return mOcclusionQueries[mCurrentTestIdx ++];
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439 | }
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440 | //-----------------------------------------------------------------------
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441 | bool OcclusionCullingSceneTraverser::setOption( const String & key, const void * val )
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442 | {
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443 | if ( key == "Algorithm" )
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444 | {
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445 | mCurrentAlgorithm = * static_cast < const int * > ( val );
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446 | return true;
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447 | }
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448 | if ( key == "Threshold" )
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449 | {
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450 | mVisibilityThreshold = * static_cast < const int * > ( val );
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451 | return true;
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452 | }
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453 |
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454 | return false;
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455 | }
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456 | //-----------------------------------------------------------------------
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457 | bool OcclusionCullingSceneTraverser::getOption( const String & key, void *val )
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458 | {
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459 | if ( key == "Algorithm" )
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460 | {
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461 | * static_cast < int * > ( val ) = mCurrentAlgorithm;
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462 | return true;
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463 | }
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464 | if ( key == "Threshold" )
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465 | {
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466 | * static_cast < unsigned int * > ( val ) = mVisibilityThreshold;
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467 | return true;
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468 | }
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469 | if ( key == "NumSceneNodes" )
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470 | {
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471 | * static_cast < unsigned int * > ( val ) = mNumSceneNodes;
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472 | return true;
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473 | }
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474 | if ( key == "NumTraversedNodes" )
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475 | {
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476 | * static_cast < unsigned int * > ( val ) = mNumTraversedNodes;
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477 | return true;
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478 | }
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479 | if ( key == "NumQueryCulledNodes" )
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480 | {
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481 | * static_cast < unsigned int * > ( val ) = mNumQueryCulledNodes;
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482 | return true;
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483 | }
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484 | if ( key == "NumFrustumCulledNodes" )
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485 | {
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486 | * static_cast < unsigned int * > ( val ) = mNumFrustumCulledNodes;
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487 | return true;
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488 | }
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489 | if ( key == "NumRenderedNodes" )
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490 | {
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491 | * static_cast < unsigned int * > ( val ) = mNumRenderedNodes;
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492 | return true;
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493 | }
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494 | return false;
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495 | }
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496 | //-----------------------------------------------------------------------
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497 | bool OcclusionCullingSceneTraverser::getOptionKeys( StringVector & refKeys )
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498 | {
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499 | refKeys.push_back( "Algorithm" );
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500 | refKeys.push_back( "Threshold" );
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501 | refKeys.push_back( "NumSceneNodes" ); |
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502 | refKeys.push_back( "NumTraversedNodes" ); |
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503 | refKeys.push_back( "NumQueryCulledNodes" ); |
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504 | refKeys.push_back( "NumFrustumCulledNodes" ); |
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505 | refKeys.push_back( "mNumRenderedGeometry" );
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506 |
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507 | return true;
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508 | }
|
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509 | }
|
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