source: GTP/trunk/Lib/Vis/OnlineCullingCHC/OGRE/include/OgreOcclusionCullingSceneManager.h @ 938

#ifndef _OcclusionCullingSceneManager_H__
#define _OcclusionCullingSceneManager_H__

#include <OgreSceneNode.h>
#include <OgreTerrainSceneManager.h>
#include <OgreOctreeNode.h>
#include <OgreOctreeCamera.h>
#include <OgrePrerequisites.h>
#include <OgreMovableObject.h>
#include "OgreOctreeHierarchyInterface.h"
#include "OgrePlatformQueryManager.h"
#include "VisibilityManager.h"
#include "Containers.h"
#include "ViewCellsManager.h"

namespace Ogre {

/**
        This class extends the terrain scene manager,
        using occlusion queries for visibility culling.
*/
class __declspec(dllexport) OcclusionCullingSceneManager: public TerrainSceneManager
{
public:
        OcclusionCullingSceneManager(const String& name, GtpVisibility::VisibilityManager *visManager);
        ~OcclusionCullingSceneManager();

        void _renderVisibleObjects();
        void _findVisibleObjects(Camera* cam, bool onlyShadowCasters);
        void _updateSceneGraph(Camera* cam);

        /** Sets the given option for the SceneManager
                @remarks Options are: "Algorithm", int *;                       
        */
        
        virtual bool setOption(const String &, const void *);
        /** Gets the given option for the Scene VisibilityManager.
            @remarks
                See setOption
        */
        virtual bool getOption(const String &, void *);

        bool getOptionValues(const String & key, StringVector &refValueList);
        bool getOptionKeys(StringVector &refKeys);

        /** Sets the visibility manager.
                @param visManager the visibility manager
        */
        void setVisibilityManager(GtpVisibility::VisibilityManager *visManager);
        /** See set.
        */
        GtpVisibility::VisibilityManager *getVisibilityManager();

        /** Render a queue group. 
                Override so we can handle delayed rendering of transparent objects
        */
        void renderBasicQueueGroupObjects(RenderQueueGroup* pGroup, 
                                                                          QueuedRenderableCollection::OrganisationMode om);

        /** Writes out stats into the Ogre log file.
        */
        void WriteLog();

        /** Override pass so we can do the z-fail pass. 
        */
        const Pass* _setPass(Pass* pass);

        /** Override from SceneManager so we can skip all but first pass for depth pass. 
        */
        bool validatePassForRendering(Pass* pass);
#ifdef ITEM_BUFFER
        void RenderItemBuffer(RenderPriorityGroup* pGroup);
        void RenderSingleObjectForItemBuffer(Renderable *rend, Pass *pass);
#endif // ITEM_BUFFER
        void _renderQueueGroupObjects(RenderQueueGroup* pGroup,
                QueuedRenderableCollection::OrganisationMode om);

        /** Override from SceneManager so that sub entities can be assigned an id for item buffer.
        */
        Entity* createEntity(const String& entityName, const String& meshName);

        /** Returns pointer to visibility manager.
        */
        GtpVisibility::VisibilityManager *GetVisibilityManager();

        /** Returns hierarchy interface.
        */
        OctreeHierarchyInterface *GetHierarchyInterface();

        /** Inherited from scene manager. Neccesary to draw terrain properly.
        */
        void endFrame();

        void renderAdditiveStencilShadowedQueueGroupObjects(RenderQueueGroup* pGroup,
                QueuedRenderableCollection::OrganisationMode om);
        void renderModulativeStencilShadowedQueueGroupObjects(RenderQueueGroup* pGroup,
                QueuedRenderableCollection::OrganisationMode om);
        
        /** Override standard function so octree boxes are always of equal side length.
                This has advantages for CHC, because terrain tiles are in different octree nodes
                and can be culled.
                msz: Modified to reflect changes in Ogre::TerrainSceneManager
        */
#if 1
        virtual void setWorldGeometry( DataStreamPtr& stream, const String& typeName );
#endif
        
        /** Loads view cells for this particular scene.
        */
        bool LoadViewCells(const String &filename);

protected:
        
        /** Creates material for depth pass, e.g., a pass that only fills the depth buffer. 
        */
        void InitDepthPass();
        /** Creates material for item buffer. 
        */
        void InitItemBufferPass();
        /** Fills render queue so that a visualization can be rendered. 
        */
        void PrepareVisualization(Camera *cam);
        /** Initialises necessary parameters for hierarchical visibility culling.
        */
        void InitVisibilityCulling(Camera *cam);
#if 0
        /** Finds object corresponding to this bounding box in the scene.
        */
        Entity *FindCorrespondingObject(const AxisAlignedBox &box);

        /** Identifies objects in the scene and gives them unique ids that
                correspond to preprocessor ids.
        */
        void IdentifyObjects(GtpVisibilityPreprocessor::ObjectContainer &objects);
#endif
        /** Loads / unloads pvs of the view cell to set the visibility in the scene.
        */
        void applyViewCellPvs(GtpVisibilityPreprocessor::ViewCell *vc, const bool load);

        /** updates pvs in current frame.
        */
        void updatePvs(Camera *cam);

        /** Sets all objects invisible.
        */
        void SetObjectsVisible(const bool visible);

        /// the interface to the scene hierarchy.
        OctreeHierarchyInterface *mHierarchyInterface;
        /// manages all visibility options
        GtpVisibility::VisibilityManager *mVisibilityManager;

        /// if a visualization of the hierarchical culling is shown
        bool mShowVisualization;

        /// if the culled nodes are indicated in the visualization
        bool mVisualizeCulledNodes;

        /// if symbols for the nodes are shown in the visualization
        bool mRenderNodesForViz;
        /// if content of the nodes is shown in the visualization
        bool mRenderNodesContentForViz;

        /// render transparents after the hierarchical traversal
        bool mDelayRenderTransparents;

        /// use a depth pass (i.e., fill only the depth buffer in the first pass)
        bool mUseDepthPass;
        /// flag indicating if we currently render the depth pass
        bool mIsDepthPassPhase;
        
        /// if we use an item buffer for rendering (i.e., object ids as color codes
        bool mUseItemBuffer;
        /// if we currently render the item buffer 
        bool mIsItemBufferPhase;

        /// if depth write should be enabled
        bool mEnableDepthWrite;
        /// if transparents are skipped during rendering
        bool mSkipTransparents;

        /// the depth pass (no lighting, just filling the depth buffer)
        Pass *mDepthPass;
        Pass *mItemBufferPass;

        int mCurrentEntityId;
        /// flag for passes which should not be deleted from queue during first traversal
        int mLeavePassesInQueue;


        /// if transparent object are considered for item buffer visibility
        bool mRenderTransparentsForItemBuffer;
        /// Always execute the vertex program of a pass, e.g., for the depth pass or item buffer
        bool mExecuteVertexProgramForAllPasses;

        /// if hierarchical culling is currently in use
        bool mIsHierarchicalCulling;

        bool mViewCellsLoaded;
        GtpVisibilityPreprocessor::ViewCellsManager *mViewCellsManager;


        /// Used to assign Ogre meshes to view cell entries.
        GtpVisibilityPreprocessor::ObjectContainer mObjects;

        GtpVisibilityPreprocessor::ViewCell *mElementaryViewCell;
        GtpVisibilityPreprocessor::ViewCell *mCurrentViewCell;

        /// If view cells are used.
        bool mUseViewCells;

        /// if the view cells are filtered
        bool mUseVisibilityFilter;
};

/// Factory for VisibilityOctreeSceneManager
class OcclusionCullingSceneManagerFactory : public SceneManagerFactory
{
protected:
        typedef std::vector<TerrainPageSource*> TerrainPageSources;
        TerrainPageSources mTerrainPageSources;
        void initMetaData(void) const;
        GtpVisibility::VisibilityManager *visManager;
public:
        OcclusionCullingSceneManagerFactory(GtpVisibility::VisibilityManager *vm)
        {
                visManager = vm;
        }

        /// Factory type name
        static const String FACTORY_TYPE_NAME;
        SceneManager* createInstance(const String& instanceName);
        void destroyInstance(SceneManager* instance);
};

} // namespace Ogre

#endif // OcclusionCullingSceneManager_H