1 | #ifndef _OcclusionCullingSceneTraverser_H__
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2 | #define _OcclusionCullingSceneTraverser_H__
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3 |
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4 | #include "OgreSceneNode.h"
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5 | #include "OgreSceneManager.h"
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6 | #include "OgrePrerequisites.h"
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7 | #include "OgreSolidHalfBoundingBox.h"
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8 | #include "OgreCamera.h"
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9 | #include "OgreRenderSystem.h"
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10 | #include <queue>
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11 |
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12 | using namespace std; |
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13 | |
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14 | namespace Ogre { |
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15 | /** |
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16 | This class implements the compare operator for the priority queue. |
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17 | a lower distance has a higher value in the queue |
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18 | */ |
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19 | template <typename T> class myless
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20 | {
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21 | public:
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22 | myless(Camera *cam) { mCamera = cam; } |
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23 | //bool operator() (HierarchyNode *v1, HierarchyNode *v2) const
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24 | bool operator() (T v1, T v2) const
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25 | {
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26 | return v1->getSquaredViewDepth(mCamera) > v2->getSquaredViewDepth(mCamera);
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27 | }
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28 | private:
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29 | Camera *mCamera;
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30 | };
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31 |
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32 | typedef pair<SceneNode *, HardwareOcclusionQuery *> query_pair;
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33 | typedef priority_queue<SceneNode *, vector<SceneNode *>, myless<vector<SceneNode *>::value_type> > PriorityQueue;
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34 | typedef queue<query_pair> QueryQueue;
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35 | /**
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36 | Class which implements a scene mangager which uses occlusion queries for culling occluded objects
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37 | */
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38 | class OcclusionCullingSceneTraverser
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39 | {
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40 | public:
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41 | OcclusionCullingSceneTraverser();
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42 | ~OcclusionCullingSceneTraverser();
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43 |
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44 | enum {RENDER_CULL_FRUSTUM, RENDER_STOP_AND_WAIT, RENDER_COHERENT, NUM_RENDERMODES};
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45 |
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46 | /** Overriden from SceneManager. Renders the scene with the specified algorithm |
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47 | /** |
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48 | The algorithm is one of |
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49 | RENDER_CULL_FRUSTUM: renders the scene with view frustum culling only |
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50 | RENDER_STOP_AND_WAIT: renders the scene with the hierarchical stop and wait algorithm |
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51 | RENDER_COHERENT: renders the scene with the coherent hierarchical algorithm |
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52 | */
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53 |
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54 | /** Sets the given option for the SceneTraverser
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55 | @remarks
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56 | Options are:
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57 | "Algorithm", int *;
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58 | */
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59 | bool setOption( const String &, const void * );
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60 | /** Gets the given option for the SceneTraverser.
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61 | @remarks
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62 | See setOption
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63 | */
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64 | bool getOption( const String &, void * );
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65 |
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66 | /** Renders current scene
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67 | @param cam current camera
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68 | @param root root of hierarchy */
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69 | void renderScene( Camera *cam, SceneNode *root );
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70 |
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71 | /** Sets the scene manager */
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72 | void setSceneManager( SceneManager *sm );
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73 | /** Sets the render system */
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74 | void setRenderSystem( RenderSystem *rsys );
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75 |
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76 | void preprocess( void );
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77 |
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78 | protected:
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79 | enum {MODE_QUERY, MODE_RENDER};
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80 | /** returns true if node is leaf of the hierarchy */
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81 | bool isLeaf( SceneNode *node );
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82 | //HACK
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83 | //unsigned int countSceneNodes(SceneNode *node);
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84 | void traverseNode( Camera *cam, SceneNode *node );
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85 | /** Renders current scene node
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86 | @param cam current camera
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87 | @param node current scene node to be rendered
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88 | */
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89 | void renderSceneNode( Camera *cam, SceneNode *node);
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90 | /** Sets rendering mode, e.g. query mode or render mode*/
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91 | void setRenderingMode( int mode );
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92 | /** Renders the scene with view frustum culling only. */ |
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93 | void renderCullFrustum( Camera *cam ); |
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94 | /** Renders the scene with the hierarchical stop and wait algorithm. */ |
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95 | void renderStopAndWait( Camera *cam ); |
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96 | /** Renders the scene with the coherent hierarchical algorithm and the query queye. */ |
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97 | void renderCoherentWithQueue( Camera *cam );
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98 | /** Issue a occlusion query for this node. */
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99 | HardwareOcclusionQuery *issueOcclusionQuery( SceneNode *node, bool wasVisible );
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100 | /** Pulls up the visibility from the child nodes. */
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101 | void pullUpVisibility( SceneNode *node );
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102 | /** delete all previously defined occlusion queries */
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103 | void deleteQueries();
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104 | /** Renders bounding box of specified node.
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105 | @param the scene node contained in the bounding box to be rendered
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106 | */
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107 | void renderBoundingBox( SceneNode *node );
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108 | /** Returns one half of the bounding box.
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109 | @param the half of the bouding box
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110 | */
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111 | SolidHalfBoundingBox *getSolidHalfBoundingBox( int half );
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112 |
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113 | // we use a priority queue rather than a renderstack
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114 | PriorityQueue *mDistanceQueue;
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115 |
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116 | std::vector<HardwareOcclusionQuery *> mOcclusionQueries;
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117 | // two halfes of a aabb
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118 | SolidHalfBoundingBox *mHalfBoundingBox[2];
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119 |
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120 | int mCurrentAlgorithm;
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121 |
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122 | unsigned int mFrameId;
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123 | unsigned int mVisibilityThreshold;
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124 |
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125 | SceneManager *mSceneManager;
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126 | RenderSystem *mRenderSystem;
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127 |
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128 | int mCurrentTestIdx;
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129 | int mQueryMode;
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130 |
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131 | //--- statistics |
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132 | unsigned int mNumSceneNodes; |
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133 | unsigned int mNumTraversedNodes; |
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134 | unsigned int mNumQueryCulledNodes; |
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135 | unsigned int mNumFrustumCulledNodes; |
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136 | unsigned int mNumRenderedGeometry;
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137 | };
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138 |
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139 | }
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140 | #endif // OCCLUSIONCULLINGSCENEMANAGER_H |
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