source: GTP/trunk/Lib/Vis/OnlineCullingCHC/include/OcclusionQuery.h @ 87

#ifndef _OcclusionQuery_H__
#define _OcclusionQuery_H__

namespace GtpVisibility {

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

} // namespace GtpVisibility
#endif // OcclusionQuery_H