[59] | 1 | #include "CoherentHierarchicalCullingManager.h" |
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[147] | 2 | #include <OgreLogManager.h> |
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[59] | 3 | |
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| 4 | namespace GtpVisibility { |
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| 5 | |
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| 6 | //----------------------------------------------------------------------- |
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[155] | 7 | CoherentHierarchicalCullingManager::CoherentHierarchicalCullingManager() |
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[142] | 8 | { |
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[155] | 9 | SetAssumedVisibility(0); |
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| 10 | // initialise random generator in case we use assumed visibility |
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[142] | 11 | srand(time(NULL)); |
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| 12 | } |
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| 13 | //----------------------------------------------------------------------- |
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[155] | 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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[59] | 22 | void CoherentHierarchicalCullingManager::RenderScene() |
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| 23 | { |
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[85] | 24 | QueryQueue queryQueue; |
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[86] | 25 | unsigned int visiblePixels = 0; |
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| 26 | bool isAvailable = false; |
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[175] | 27 | //Ogre::LogManager::getSingleton().logMessage("Coherent Hierarchical Culling"); |
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| 28 | |
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[59] | 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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[86] | 33 | queryQueue.front().second->GetQueryResult(visiblePixels, |
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| 34 | mHierarchyInterface->GetQueue()->empty())) |
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[59] | 35 | { |
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[94] | 36 | HierarchyNode *node = queryQueue.front().first; |
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[115] | 37 | |
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[59] | 38 | queryQueue.pop(); |
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| 39 | |
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[96] | 40 | if (visiblePixels > mVisibilityThreshold) |
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[59] | 41 | { |
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| 42 | mHierarchyInterface->PullUpVisibility(node); |
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[158] | 43 | mHierarchyInterface->TraverseNode(node); |
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[59] | 44 | } |
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| 45 | else |
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[142] | 46 | { |
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[155] | 47 | ++ mNumQueryCulledNodes; |
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[112] | 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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[59] | 53 | } |
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[85] | 54 | } |
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[87] | 55 | |
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[59] | 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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[74] | 64 | if (!mHierarchyInterface->CheckFrustumVisible(node, intersects)) |
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[130] | 65 | { |
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[147] | 66 | ++ mNumFrustumCulledNodes; |
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[112] | 67 | |
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[147] | 68 | if (mVisualizeCulledNodes) |
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[112] | 69 | { |
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[113] | 70 | mHierarchyInterface->VisualizeCulledNode(node, FRUSTUM_CULLED); |
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[112] | 71 | } |
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[59] | 72 | } |
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[155] | 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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[74] | 78 | else |
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[59] | 79 | { |
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[148] | 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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[155] | 83 | |
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| 84 | // if we assume node to be visible in this frame => skip query |
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[187] | 85 | if (wasVisible && (mAssumedVisibility > 0) && DecideVisible(node) && mHierarchyInterface->HasGeometry(node)) |
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[74] | 86 | { |
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[155] | 87 | SkipQuery(node); |
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[59] | 88 | |
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[74] | 89 | continue; |
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| 90 | } |
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[59] | 91 | |
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[148] | 92 | // identify nodes that we cannot skip queries for |
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[87] | 93 | // geometry not only in leaves => test for renderable geometry |
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[148] | 94 | bool issueQuery = !wasVisible || mHierarchyInterface->HasGeometry(node); |
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[147] | 95 | |
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| 96 | // reset node's visibility classification |
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[148] | 97 | mHierarchyInterface->SetNodeVisible(node, false); |
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[59] | 98 | |
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[74] | 99 | // update node's visited flag |
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| 100 | mHierarchyInterface->SetLastVisited(node, mHierarchyInterface->GetFrameId()); |
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[59] | 101 | |
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[87] | 102 | // skip testing previously visible nodes without geometry |
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| 103 | if (issueQuery) |
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[74] | 104 | { |
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[147] | 105 | ++ mNumQueriesIssued; |
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[142] | 106 | |
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[87] | 107 | queryQueue.push(QueryPair(node, mHierarchyInterface-> |
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[175] | 108 | IssueNodeOcclusionQuery(node, wasVisible))); |
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[74] | 109 | } |
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[147] | 110 | |
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[74] | 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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[158] | 114 | mHierarchyInterface->TraverseNode(node); |
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[74] | 115 | } |
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[59] | 116 | } |
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| 117 | } |
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| 118 | } |
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| 119 | } |
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[142] | 120 | //----------------------------------------------------------------------- |
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[146] | 121 | void CoherentHierarchicalCullingManager::SetAssumedVisibility(unsigned int assumedVisibility) |
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[142] | 122 | { |
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| 123 | mAssumedVisibility = assumedVisibility; |
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[146] | 124 | |
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| 125 | mThreshold = 0; |
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| 126 | |
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[147] | 127 | if (mAssumedVisibility > 0) |
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[146] | 128 | { |
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[147] | 129 | mThreshold = RAND_MAX - RAND_MAX / mAssumedVisibility; |
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[146] | 130 | } |
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[147] | 131 | //std::stringstream d; d << "*** setting assumed vis: " << mAssumedVisibility; Ogre::LogManager::getSingleton().logMessage(d.str()); |
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[142] | 132 | } |
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| 133 | //----------------------------------------------------------------------- |
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[147] | 134 | bool CoherentHierarchicalCullingManager::DecideVisible(HierarchyNode *node) const |
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[142] | 135 | { |
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[155] | 136 | /*bool result = rand() < mThreshold; std::stringstream d; d << "Assumed vis: " << mAssumedVisibility << ", result: " << result; |
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[147] | 137 | Ogre::LogManager::getSingleton().logMessage(d.str()); return result;*/ |
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| 138 | |
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[146] | 139 | return rand() < mThreshold; |
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[142] | 140 | } |
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[155] | 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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[158] | 148 | mHierarchyInterface->TraverseNode(node); |
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[155] | 149 | } |
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| 150 | |
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[59] | 151 | } // namespace GtpVisibility |
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