OgreHardwareOcclusionQuery.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2011 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/
#ifndef _HardwareOcclusionQuery__
#define _HardwareOcclusionQuery__

// Precompiler options
#include "OgrePrerequisites.h"

namespace Ogre {



    class _OgreExport HardwareOcclusionQuery : public RenderSysAlloc
{
//----------------------------------------------------------------------
// Public methods
//--
public:
    HardwareOcclusionQuery();

    virtual ~HardwareOcclusionQuery();

    virtual void beginOcclusionQuery() = 0;

    virtual void endOcclusionQuery() = 0;

    virtual bool pullOcclusionQuery(unsigned int* NumOfFragments) = 0;

    unsigned int getLastQuerysPixelcount() const { return mPixelCount; }

     virtual bool isStillOutstanding(void) = 0; 


    //----------------------------------------------------------------------
    // protected members
    //--
    protected :
        // numbers of visible pixels determined by last query
        unsigned int mPixelCount;
        // is query hasn't yet returned a result.
        bool         mIsQueryResultStillOutstanding;
};

}
#endif