#ifndef _OcclusionQueriesQueryManager_H__
#define _OcclusionQueriesQueryManager_H__

#include "OgrePlatformQueryManager.h"

namespace Ogre {
  
/**
	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,
								 bool renderPatches,
		                         bool useItemBufferForGeometry);
    
    void ComputeCameraVisibility(const Camera &camera,
			    InfoContainer<GtpVisibility::NodeInfo> *visibleNodes,
			    InfoContainer<GtpVisibility::MeshInfo> *visibleGeometry,
				InfoContainer<GtpVisibility::PatchInfo> *visiblePatches,
			    bool relativeVisibility = false);
    
    /** 
	Uses the specified point to execute the visibility query in all directions. 
	@sa ComputeCameraVisibility()
    */
    void ComputeFromPointVisibility(const Vector3 &point,
			       InfoContainer<GtpVisibility::NodeInfo> *visibleNodes,
			       InfoContainer<GtpVisibility::MeshInfo> *visibleGeometry,
				   InfoContainer<GtpVisibility::PatchInfo> *visiblePatches,
			       bool relativeVisibility = false);
    

protected:

	void CollectGeometryVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
								   GtpVisibility::QueryList::iterator &projQueryIt,
								   GtpVisibility::GeometryList *geometryList, 
								   InfoContainer<GtpVisibility::MeshInfo> *visibleGeometry,
								   bool relativeVisibility);

	void CollectNodeVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
							   GtpVisibility::QueryList::iterator &projQueryIt,
							   GtpVisibility::HierarchyNodeList *nodeList, 
							   InfoContainer<GtpVisibility::NodeInfo> *visibleNodes,
							   bool relativeVisibility);

	void CollectRelativeGeometryVisibilityForItemBuffer(GtpVisibility::QueryList::iterator &projQueryIt,
												GtpVisibility::GeometryList *geometryList, 
												InfoContainer<GtpVisibility::MeshInfo> *visibleGeometry);

	void CollectRelativePatchVisibilityForItemBuffer(
									GtpVisibility::QueryList::iterator &projQueryIt,
									GtpVisibility::PatchList *patchList, 
									InfoContainer<GtpVisibility::PatchInfo> *visiblePatches);

	void CollectPatchVisibility(GtpVisibility::QueryList::iterator &visQueryIt, 
								GtpVisibility::QueryList::iterator &projQueryIt,
								GtpVisibility::PatchList *patchList, 
								InfoContainer<GtpVisibility::PatchInfo> *visiblePatches,
								bool relativeVisibility);

	void RemoveDuplicateNodes(InfoContainer<GtpVisibility::NodeInfo> *visibleNodes);
	void RemoveDuplicateGeometry(InfoContainer<GtpVisibility::MeshInfo> *visibleMesh);

	bool mUseItemBuffer;
};

} // namespace Ogre

#endif // OcclusionQueriesQueryManager