1 | #include "CoherentHierarchicalCullingManager.h" |
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2 | #include <OgreLogManager.h> |
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3 | |
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4 | namespace GtpVisibility { |
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5 | |
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6 | //----------------------------------------------------------------------- |
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7 | CoherentHierarchicalCullingManager::CoherentHierarchicalCullingManager() |
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8 | { |
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9 | SetAssumedVisibility(0); |
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10 | // initialise random generator in case we use assumed visibility |
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11 | srand(time(NULL)); |
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12 | } |
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13 | //----------------------------------------------------------------------- |
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14 | CoherentHierarchicalCullingManager::CoherentHierarchicalCullingManager(const unsigned int |
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15 | assumedVisibility) |
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16 | { |
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17 | SetAssumedVisibility(assumedVisibility); |
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18 | // initialise random generator in case we use assumed visibility |
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19 | srand(time(NULL)); |
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20 | } |
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21 | //----------------------------------------------------------------------- |
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22 | void CoherentHierarchicalCullingManager::RenderScene() |
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23 | { |
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24 | QueryQueue queryQueue; |
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25 | unsigned int visiblePixels = 0; |
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26 | bool isAvailable = false; |
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27 | //Ogre::LogManager::getSingleton().logMessage("Coherent Hierarchical Culling"); |
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28 | |
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29 | //-- PART 1: process finished occlusion queries |
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30 | while (!mHierarchyInterface->GetQueue()->empty() || !queryQueue.empty()) |
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31 | { |
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32 | while (!queryQueue.empty() && |
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33 | queryQueue.front().second->GetQueryResult(visiblePixels, |
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34 | mHierarchyInterface->GetQueue()->empty())) |
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35 | { |
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36 | HierarchyNode *node = queryQueue.front().first; |
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37 | |
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38 | queryQueue.pop(); |
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39 | |
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40 | if (visiblePixels > mVisibilityThreshold) |
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41 | { |
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42 | mHierarchyInterface->PullUpVisibility(node); |
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43 | mHierarchyInterface->TraverseNode(node); |
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44 | } |
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45 | else |
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46 | { |
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47 | ++ mNumQueryCulledNodes; |
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48 | |
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49 | if(mVisualizeCulledNodes) |
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50 | { |
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51 | mHierarchyInterface->VisualizeCulledNode(node, QUERY_CULLED); |
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52 | } |
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53 | } |
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54 | } |
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55 | |
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56 | //-- PART 2: hierarchical traversal |
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57 | if (!mHierarchyInterface->GetQueue()->empty()) |
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58 | { |
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59 | HierarchyNode *node = mHierarchyInterface->GetQueue()->top(); |
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60 | mHierarchyInterface->GetQueue()->pop(); |
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61 | |
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62 | bool intersects = false; |
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63 | |
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64 | if (!mHierarchyInterface->CheckFrustumVisible(node, intersects)) |
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65 | { |
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66 | ++ mNumFrustumCulledNodes; |
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67 | |
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68 | if (mVisualizeCulledNodes) |
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69 | { |
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70 | mHierarchyInterface->VisualizeCulledNode(node, FRUSTUM_CULLED); |
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71 | } |
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72 | } |
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73 | // -- if node intersects near plane, skip query because wrong results possible |
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74 | else if (intersects) |
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75 | { |
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76 | SkipQuery(node); |
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77 | } |
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78 | else |
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79 | { |
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80 | // identify previously visible nodes |
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81 | bool wasVisible = mHierarchyInterface->IsNodeVisible(node) && |
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82 | (mHierarchyInterface->LastVisited(node) == mHierarchyInterface->GetFrameId() - 1); |
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83 | |
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84 | // if we assume node to be visible in this frame => skip query |
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85 | if (wasVisible && (mAssumedVisibility > 0) && DecideVisible(node) && mHierarchyInterface->HasGeometry(node)) |
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86 | { |
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87 | SkipQuery(node); |
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88 | |
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89 | continue; |
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90 | } |
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91 | |
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92 | // identify nodes that we cannot skip queries for |
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93 | // geometry not only in leaves => test for renderable geometry |
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94 | bool issueQuery = !wasVisible || mHierarchyInterface->HasGeometry(node); |
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95 | |
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96 | // reset node's visibility classification |
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97 | mHierarchyInterface->SetNodeVisible(node, false); |
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98 | |
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99 | // update node's visited flag |
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100 | mHierarchyInterface->SetLastVisited(node, mHierarchyInterface->GetFrameId()); |
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101 | |
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102 | // skip testing previously visible nodes without geometry |
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103 | if (issueQuery) |
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104 | { |
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105 | ++ mNumQueriesIssued; |
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106 | |
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107 | queryQueue.push(QueryPair(node, mHierarchyInterface-> |
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108 | IssueNodeOcclusionQuery(node, wasVisible))); |
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109 | } |
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110 | |
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111 | // always traverse a node if it was visible |
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112 | if (wasVisible) |
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113 | { |
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114 | mHierarchyInterface->TraverseNode(node); |
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115 | } |
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116 | } |
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117 | } |
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118 | } |
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119 | } |
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120 | //----------------------------------------------------------------------- |
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121 | void CoherentHierarchicalCullingManager::SetAssumedVisibility(unsigned int assumedVisibility) |
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122 | { |
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123 | mAssumedVisibility = assumedVisibility; |
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124 | |
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125 | mThreshold = 0; |
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126 | |
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127 | if (mAssumedVisibility > 0) |
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128 | { |
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129 | mThreshold = RAND_MAX - RAND_MAX / mAssumedVisibility; |
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130 | } |
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131 | //std::stringstream d; d << "*** setting assumed vis: " << mAssumedVisibility; Ogre::LogManager::getSingleton().logMessage(d.str()); |
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132 | } |
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133 | //----------------------------------------------------------------------- |
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134 | bool CoherentHierarchicalCullingManager::DecideVisible(HierarchyNode *node) const |
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135 | { |
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136 | /*bool result = rand() < mThreshold; std::stringstream d; d << "Assumed vis: " << mAssumedVisibility << ", result: " << result; |
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137 | Ogre::LogManager::getSingleton().logMessage(d.str()); return result;*/ |
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138 | |
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139 | return rand() < mThreshold; |
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140 | } |
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141 | //----------------------------------------------------------------------- |
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142 | void CoherentHierarchicalCullingManager::SkipQuery(HierarchyNode *node) |
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143 | { |
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144 | // -- set node to be visible in this frame, then traverse it |
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145 | mHierarchyInterface->SetLastVisited(node, mHierarchyInterface->GetFrameId()); |
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146 | |
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147 | mHierarchyInterface->PullUpVisibility(node); |
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148 | mHierarchyInterface->TraverseNode(node); |
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149 | } |
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150 | |
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151 | } // namespace GtpVisibility |
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