source: trunk/VUT/GtpVisibility/include/CoherentHierarchicalCullingManager.h @ 146

#ifndef _CoherentHierarchicalCullingManager_H__
#define _CoherentHierarchicalCullingManager_H__

#include "CullingManager.h"
#include "HierarchyInterface.h"


namespace GtpVisibility
{

/** Renders the scene with the coherent hierarchical culling algorithm. 
*/
class CoherentHierarchicalCullingManager : public CullingManager
{
public:
        CoherentHierarchicalCullingManager();
        void RenderScene();
        /** Sets assumed visibility which is a an estimation for e 
                how many frames the visibility is considered to be valied
                @param assumedVisibility indicates for how many frames the 
                same visibility is be assumed.
                if 0, the visibility is tested deterministically for each frame.
        */
        void SetAssumedVisibility(unsigned int assumedVisibility);

protected:
        /** Decides wether occlusion query should be issued depending on some 
                assumed visibility factor.
                @returns if occlusion query should be issued
        */
        bool DecideQueryTest(HierarchyNode *node) const;

        unsigned int mAssumedVisibility;
        /** Threshold for rand function to return positive result with respect to
                mAssumedVisibility.
        */
        unsigned int mThreshold;
};

} // namespace GtpVisibility

#endif // CoherentHierarchicalCullingManager_H