[12] | 1 | #ifndef _OcclusionCullingSceneManager_H__
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| 2 | #define _OcclusionCullingSceneManager_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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[26] | 7 | #include "OgreSolidHalfBoundingBox.h"
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[12] | 8 | #include <queue>
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| 9 |
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| 10 | using namespace std; |
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| 11 | |
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| 12 | namespace Ogre { |
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| 13 | /** |
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| 14 | This class implements the compare operator for the priority queue. |
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| 15 | a lower distance has a higher value in the queue |
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| 16 | */ |
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| 17 | template <typename T> class myless
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| 18 | {
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| 19 | public:
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[19] | 20 | myless(Camera *cam) { mCamera = cam; } |
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[12] | 21 | //bool operator() (HierarchyNode *v1, HierarchyNode *v2) const
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| 22 | bool operator() (T v1, T v2) const
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| 23 | {
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[19] | 24 | return v1->getSquaredViewDepth(mCamera) > v2->getSquaredViewDepth(mCamera);
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[12] | 25 | }
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[19] | 26 | private:
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| 27 | Camera *mCamera;
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[12] | 28 | };
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| 29 |
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[26] | 30 | typedef pair<SceneNode *, HardwareOcclusionQuery *> query_pair;
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[12] | 31 | typedef priority_queue<SceneNode *, vector<SceneNode *>, myless<vector<SceneNode *>::value_type> > PriorityQueue;
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[26] | 32 | typedef queue<query_pair> QueryQueue;
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[12] | 33 | /**
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| 34 | Class which implements a scene mangager which uses occlusion queries for culling occluded objects
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| 35 | */
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| 36 | class OcclusionCullingSceneManager : public SceneManager
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| 37 | {
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| 38 | public:
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| 39 | OcclusionCullingSceneManager();
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[22] | 40 | ~OcclusionCullingSceneManager();
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[12] | 41 |
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[26] | 42 |
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| 43 | enum {RENDER_CULL_FRUSTUM, RENDER_STOP_AND_WAIT, RENDER_COHERENT, NUM_RENDERMODES};
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| 44 |
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| 45 | /** Overriden from SceneManager. Renders the scene with the specified algorithm |
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| 46 | /** |
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| 47 | The algorithm is one of |
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| 48 | RENDER_CULL_FRUSTUM: renders the scene with view frustum culling only |
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| 49 | RENDER_STOP_AND_WAIT: renders the scene with the hierarchical stop and wait algorithm |
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| 50 | RENDER_COHERENT: renders the scene with the coherent hierarchical algorithm |
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| 51 | */
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[12] | 52 | void _renderVisibleObjects(void);
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[19] | 53 | void _findVisibleObjects(Camera* cam, bool onlyShadowCasters);
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[22] | 54 | void _updateSceneGraph(Camera* cam);
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| 55 |
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[12] | 56 | protected:
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[22] | 57 | enum {MODE_QUERY, MODE_RENDER};
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[12] | 58 |
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[22] | 59 | int isLeaf(SceneNode *node);
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| 60 | int countSceneNodes(SceneNode *node);
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[19] | 61 | void renderZPass();
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| 62 | void traverseNode(SceneNode *node);
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[22] | 63 | /** Renders current node */
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| 64 | void render(SceneNode *node);
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| 65 | /** Sets rendering mode, e.g. query mode or render mode*/
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| 66 | void setRenderingMode(int mode);
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[21] | 67 |
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[22] | 68 | /** Renders the scene with view frustum culling only. */ |
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| 69 | void renderCullFrustum(); |
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| 70 | /** Renders the scene with the hierarchical stop and wait algorithm. */ |
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| 71 | void renderStopAndWait(); |
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| 72 | /** Renders the scene with the coherent hierarchical algorithm and the query queye. */ |
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| 73 | void renderCoherentWithQueue();
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| 74 | /** Issue a occlusion query for this node. */
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[26] | 75 | HardwareOcclusionQuery *issueOcclusionQuery(SceneNode *node, bool wasVisible);
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[22] | 76 | /** Pulls up the visibility from the child nodes. */
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| 77 | void pullUpVisibility(SceneNode *node);
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[26] | 78 | /** delete all previously defined occlusion queries */
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[22] | 79 | void deleteQueries();
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[26] | 80 | /** Renders bounding box of specified node.
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| 81 | @param the node which bounding box is to be rendered
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| 82 | */
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| 83 | void renderBoundingBox(SceneNode *node);
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| 84 | /** Returns one half of the bounding box.
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| 85 | @param the half of the bouding box
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| 86 | */
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| 87 | SolidHalfBoundingBox *getSolidHalfBoundingBox(int half);
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| 88 | /** sets the type of the algorithm
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| 89 | @param algorithm type
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| 90 | */
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| 91 | void setAlgorithmType(int type);
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| 92 |
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| 93 | int getAlgorithmType();
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[22] | 94 |
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[26] | 95 | // we use a priority queue rather than a renderstack
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[19] | 96 | PriorityQueue *mDistanceQueue;
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[26] | 97 |
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[23] | 98 | unsigned int mFrameId;
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[22] | 99 | unsigned int mVisibilityThreshold;
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| 100 | unsigned int mNumSceneNodes;
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[21] | 101 | int mCurrentTestIdx;
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[22] | 102 | int mQueryMode;
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| 103 |
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[21] | 104 | std::vector<HardwareOcclusionQuery *> mOcclusionQueries;
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[26] | 105 | // two halfes of a aabb
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| 106 | SolidHalfBoundingBox *mHalfBoundingBox[2];
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| 107 | int mAlgorithmType;
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[12] | 108 | };
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| 109 |
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| 110 | }
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| 111 | #endif // OCCLUSIONCULLINGSCENEMANAGER_H |
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