#ifndef _OcclusionQueriesQueryManager_H__
#define _OcclusionQueriesQueryManager_H__


#include "OgrePlatformQueryManager.h"


namespace Ogre {
  
class OgrePlatformHierarchyInterface;
class Viewport;

/** Class which implements a query manager for Ogre scene queries using occlusion queries.
*/
class __declspec(dllexport) OcclusionQueriesQueryManager: public PlatformQueryManager
{
public:
    /** Constructor taking a hierarchy interface as an argument. This allows to operate
		on different hierarchy types, while reusing the implementation of the query methods.
    */
	OcclusionQueriesQueryManager(PlatformHierarchyInterface *hierarchyInterface, 
								 Viewport *vp,
								 int queryModes):  
	PlatformQueryManager(hierarchyInterface, vp, queryModes)
	{}

    void ComputeCameraVisibility(const Camera &camera,
								 NodeInfoContainer *visibleNodes,
								 MeshInfoContainer *visibleGeometry,
								 PatchInfoContainer *visiblePatches,
								 const bool relativeVisibility,
								 const bool approximateVisibility);
    
    /** Uses the specified point to execute the visibility query in all directions. 
		@sa ComputeCameraVisibility()
    */
    void ComputeFromPointVisibility(const Vector3 &point,
									NodeInfoContainer *visibleNodes,
									MeshInfoContainer *visibleGeometry,
									PatchInfoContainer *visiblePatches,
									const bool relativeVisibility,
									const bool approximateVisibility);
    

protected:

	void CollectGeometryVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
								   GtpVisibility::QueryList::iterator &projQueryIt,
								   GeometryVector *geometryList, 
								   MeshInfoContainer *visibleGeometry,
								   bool relativeVisibility);

	void CollectNodeVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
							   GtpVisibility::QueryList::iterator &projQueryIt,
							   GtpVisibility::NodeVector *nodeList, 
							   NodeInfoContainer *visibleNodes,
							   bool relativeVisibility);


	void CollectPatchVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
								GtpVisibility::QueryList::iterator &projQueryIt,
								PatchVector *patchList, 
								PatchInfoContainer *visiblePatches,
								bool relativeVisibility);

	void RemoveDuplicateNodes(NodeInfoContainer *visibleNodes);
	void RemoveDuplicateGeometry(MeshInfoContainer *visibleMesh);
	void RemoveDuplicatePatches(PatchInfoContainer *visiblePatches);

	/** Returns the patches of the geometry of a given node. 
		@param node the node containing the patches
		@param patchList the patches are returned in this list
	*/
	virtual void GetNodePatchList(GtpVisibility::HierarchyNode *node,	
					 			  PatchVector *patchList);

};

} // namespace Ogre

#endif // OcclusionQueriesQueryManager