accum.h

/* Copyright (c) 2009-2010, Stefan Eilemann <eile@equalizergraphics.com>
 *               2009, Sarah Amsellem <sarah.amsellem@gmail.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *  
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQUTIL_ACCUM_H
#define EQUTIL_ACCUM_H

#include <eq/gl.h>  // for GLEW
#include <eq/types.h>

namespace eq
{
namespace util
{
    class AccumBufferObject;

    class Accum
    {
    public: 
        EQ_API Accum( const GLEWContext* const glewContext );

        EQ_API ~Accum();

        EQ_API bool init( const PixelViewport& pvp, GLuint textureFormat );

        EQ_API void exit();

        EQ_API bool resize( const int width, const int height );

        EQ_API void clear();

        EQ_API void accum();

        EQ_API void display();

        EQ_API uint32_t getMaxSteps() const;

        uint32_t getNumSteps() const { return _numSteps; }

        void setTotalSteps( uint32_t totalSteps )
            { _totalSteps = totalSteps; }

        uint32_t getTotalSteps() { return _totalSteps; }

        EQ_API bool usesFBO() const;

        EQ_API static bool usesFBO( const GLEWContext* glewContext );

        const GLEWContext* glewGetContext() const { return _glewContext; }

    private:
        const GLEWContext* const _glewContext;

        int _width;
        int _height;

        AccumBufferObject* _abo;
        uint32_t _numSteps;
        uint32_t _totalSteps;
    };
}
}

#endif // EQUTIL_ACCUM_H