source: trunk/VUT/GtpVisibility/include/OcclusionQuery.h @ 59

#ifndef _OcclusionQuery_H__
#define _OcclusionQuery_H__

namespace GtpVisibility {

/** This class is an abstract interface for occlusion queries.
*/
class OcclusionQuery
{
public:
//      OcclusionQuery();
        virtual ~OcclusionQuery() {};
        /** Returns the result of an occlusion query in terms of visible pixels.
                @returns number of visible pixels
        */
        virtual unsigned int GetQueryResult() const = 0;
        /** Returns true if the result of the query is available, false otherwise.
                @returns if result is available
        */
        virtual bool ResultAvailable() const = 0;
        /** Begins occlusion query.
                @remark the query counts the number of visible pixels between it's begin and end
        */
        virtual void BeginQuery() const = 0;
        /** Ends occlusion query.
        */
        virtual void EndQuery() const = 0;
};

} // namespace GtpVisibility
#endif // OcclusionQuery_H