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/client/os.h>  // for GLEW

namespace eq
{
    class PixelViewport;

namespace util
{
    class AccumBufferObject;

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

        EQ_EXPORT ~Accum();

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

        EQ_EXPORT void exit();

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

        EQ_EXPORT void clear();

        EQ_EXPORT void accum();

        EQ_EXPORT void display();

        EQ_EXPORT uint32_t getMaxSteps() const;

        EQ_EXPORT uint32_t getNumSteps() const { return _numSteps; }

        EQ_EXPORT void setTotalSteps( uint32_t totalSteps )
            { _totalSteps = totalSteps; }
        EQ_EXPORT uint32_t getTotalSteps() { return _totalSteps; }

        EQ_EXPORT bool usesFBO() const;

        EQ_EXPORT static bool usesFBO( const GLEWContext* glewContext );

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

    private:
        GLEWContext* const _glewContext;

        int _width;
        int _height;

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

#endif //EQUTIL_ACCUMULATION_H