source: trunk/VUT/Ogre/include/OgrePlatformHierarchyInterface.h @ 59

#ifndef _PlatformHierarchyInterface_H__
#define _PlatformHierarchyInterface_H__

#include <OgreSceneManager.h>
#include <OgrePrerequisites.h>
#include <OgreCamera.h>
#include <OgreRenderSystem.h>

#include "OgreSolidHalfBoundingBox.h"
#include "HierarchyInterface.h"
#include "OgrePlatformOcclusionQuery.h"

namespace Ogre {

/**     Class which implements a hierarchy interface for a specific type of hierarchy.
        @remark also provides methods for using occlusion queries on the hierarchy nodes
*/

class PlatformHierarchyInterface: public GtpVisibility::HierarchyInterface
{
public:
        /** Construction taking the current scene manager and the current rendersystem as argument
                @param sm current scene manager
                @param rsys current render system 
        */
        PlatformHierarchyInterface(SceneManager *sm, RenderSystem *rsys);
        ~PlatformHierarchyInterface();
                
        /** Returns next available occlusion query or creates new one.
                @return the next occlusion query
        */
        GtpVisibility::OcclusionQuery *GetNextOcclusionQuery();
                
        /** Sets the current camera.
                @param cam the current camera
        */
        void SetCamera(Camera *cam);
                
        /** Initialises this scene traverser for the current frame.
        @param root root of the hierarchy
                @param cam current camera
                @remark convenience method wich calls VisibilitySceneTraverser::initFrame,
                sets the current camera, and initialises the distance queue.
        */
        void InitFrame(GtpVisibility::HierarchyNode *root, Ogre::Camera *cam);
        /** Checks if the node is visible from the current view frustum.
                @param node the current node
                @param intersects returns true if the current node intersects the near plane
        */
        bool CheckFrustumVisible(GtpVisibility::HierarchyNode *node, bool &intersects);
        /** Sets pointer to the current scene manager.
                @param sm the scene manager 
        */
        void SetSceneManager(SceneManager *sm);
        /** Sets pointer to the current render system 
                @param rsys the rendersystem 
        */
        void SetRenderSystem(RenderSystem *rsys);
        /** Returns pointer to bounding box of node.
                @param node current hierarchy node
                @returns bounding box of current node
        */
        virtual AxisAlignedBox *GetBoundingBox(GtpVisibility::HierarchyNode *node) = 0;
        /** Issue a occlusion query for this node. 
                @param node the current hierarchy node
                @returns occlusion query for this node
        */
        GtpVisibility::OcclusionQuery *IssueOcclusionQuery(GtpVisibility::HierarchyNode *node);

protected:
        /** Deletes all occlusion queries.
        */
        void DeleteQueries();
        /** Renders bounding box of specified node.
                @param box the bounding box of the scene node to be rendered 
        */
        void RenderBoundingBox(AxisAlignedBox *box);
        /** Returns one half of the bounding box.
                @param half the half index of the bouding box (0 or 1)
        */
        SolidHalfBoundingBox *GetSolidHalfBoundingBox(int half);

        /** two halfes of an aabb. 
        */
        SolidHalfBoundingBox *mHalfBoundingBox[2];      

        SceneManager *mSceneManager;
        RenderSystem *mRenderSystem;

        Camera *mCamera;
        AxisAlignedBox mBox;

        std::vector<PlatformOcclusionQuery *> mOcclusionQueries;
};

} // namespace Ogre

#endif // PlatformHierarchyInterface_H