opengl_compositor.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2016 CERN
 * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef OPENGL_COMPOSITOR_H_
#define OPENGL_COMPOSITOR_H_

#include <gal/opengl/kiglew.h>    // Must be included first

#include <gal/compositor.h>
#include <gal/opengl/antialiasing.h>
#include <gal/gal_display_options.h>
#include <deque>

namespace KIGFX
{

class OPENGL_COMPOSITOR : public COMPOSITOR
{
public:
    OPENGL_COMPOSITOR();
    virtual ~OPENGL_COMPOSITOR();

    virtual void Initialize() override;

    virtual void Resize( unsigned int aWidth, unsigned int aHeight ) override;

    virtual unsigned int CreateBuffer() override;

    virtual void SetBuffer( unsigned int aBufferHandle ) override;

    inline virtual unsigned int GetBuffer() const override
    {
        if( m_curFbo == DIRECT_RENDERING )
            return DIRECT_RENDERING;

        return m_curBuffer + 1;
    }

    virtual void ClearBuffer( const COLOR4D& aColor ) override;

    virtual void DrawBuffer( unsigned int aBufferHandle ) override;

    virtual void Begin() override;

    // @copydoc COMPOSITOR::Present()
    virtual void Present() override;

    // Constant used by glBindFramebuffer to turn off rendering to framebuffers
    static const unsigned int DIRECT_RENDERING = 0;

    VECTOR2U GetScreenSize() const;
    GLenum   GetBufferTexture( unsigned int aBufferHandle );
    void     DrawBuffer( unsigned int aSourceHandle, unsigned int aDestHandle );
    unsigned int CreateBuffer( VECTOR2U aDimensions );

    void SetAntialiasingMode( OPENGL_ANTIALIASING_MODE aMode ); // clears all buffers
    OPENGL_ANTIALIASING_MODE GetAntialiasingMode() const;

    int GetAntialiasSupersamplingFactor() const;
    VECTOR2D GetAntialiasRenderingOffset() const;

protected:
    void bindFb( unsigned int aFb );

    void clean();

    inline unsigned int usedBuffers()
    {
        return m_buffers.size();
    }

    // Buffers are simply textures storing a result of certain target rendering.
    struct OPENGL_BUFFER
    {
        VECTOR2U dimensions;
        GLuint textureTarget;                
        GLuint attachmentPoint;              
    };

    bool            m_initialized;            
    unsigned int    m_curBuffer;              
    GLuint          m_mainFbo;                
    GLuint          m_depthBuffer;            
    typedef std::deque<OPENGL_BUFFER> OPENGL_BUFFERS;

    OPENGL_BUFFERS  m_buffers;

    GLuint          m_curFbo;

    OPENGL_ANTIALIASING_MODE m_currentAntialiasingMode;
    std::unique_ptr<OPENGL_PRESENTOR> m_antialiasing;
};
} // namespace KIGFX

#endif /* COMPOSITOR_H_ */