/***********************************************************************
    created:    Sun Feb 1 2009
    author:     Paul D Turner
*************************************************************************/
/***************************************************************************
     Copyright (C) 2004 - 2009 Paul D Turner & The CEGUI Development Team

     Permission is hereby granted, free of charge, to any person obtaining
     a copy of this software and associated documentation files (the
     "Software"), to deal in the Software without restriction, including
     without limitation the rights to use, copy, modify, merge, publish,
     distribute, sublicense, and/or sell copies of the Software, and to
     permit persons to whom the Software is furnished to do so, subject to
     the following conditions:

     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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     OTHER DEALINGS IN THE SOFTWARE.
 ***************************************************************************/
#ifndef _CEGUIOpenGLWGLPBTextureTarget_h_
#define _CEGUIOpenGLWGLPBTextureTarget_h_

//#include <windows.h>
#include "CEGUI/RendererModules/OpenGL/GL.h"

// GLEW changed to glbinding
#include <glbinding/gl/gl.h>
//#include <GL/glew.h>

#include "CEGUI/RendererModules/OpenGL/TextureTarget.h"
#include "../../Rect.h"

#if defined(_MSC_VER)
#   pragma warning(push)
#   pragma warning(disable : 4250)
#endif

// Start of CEGUI namespace section
namespace CEGUI
{
  class OpenGLTexture;

  /*!
    \brief
      OpenGLWGLPBTextureTarget - allows rendering to an OpenGL texture via the
      pbuffer WGL extension.
  */
  class OPENGL_GUIRENDERER_API OpenGLWGLPBTextureTarget : public OpenGLTextureTarget
  {
  public:
    OpenGLWGLPBTextureTarget(OpenGLRendererBase &owner);
    virtual ~OpenGLWGLPBTextureTarget();

    // overrides from OpenGLRenderTarget
    void activate();
    void deactivate();
    // implementation of TextureTarget interface
    void clear();
    void declareRenderSize(const Sizef &sz);
    // specialise functions from OpenGLTextureTarget
    void grabTexture();
    void restoreTexture();

  protected:
    //! default size of created texture objects
    static const float DEFAULT_SIZE;

    //! Initialise the PBuffer with the needed size
    void initialisePBuffer();

    //! Cleans up the pbuffer resources.
    void releasePBuffer();

    //! Switch rendering so it targets the pbuffer
    void enablePBuffer() const;

    //! Switch rendering to target what was active before the pbuffer was used.
    void disablePBuffer() const;

    //! Perform basic initialisation of the texture we're going to use.
    void initialiseTexture();

    //! Holds the pixel format we use when creating the pbuffer.
    int d_pixfmt;
    //! Handle to the pbuffer itself.
    HPBUFFERARB d_pbuffer;
    //! Handle to the rendering context for the pbuffer.
    HGLRC d_context;
    //! Handle to the Windows device context for the pbuffer.
    HDC d_hdc;
    //! Handle to the rendering context in use when we switched to the pbuffer.
    mutable HGLRC d_prevContext;
    //! Handle to the device context in use when we switched to the pbuffer.
    mutable HDC d_prevDC;
  };

} // End of  CEGUI namespace section

#if defined(_MSC_VER)
#   pragma warning(pop)
#endif

#endif  // end of guard _CEGUIOpenGLWGLPBTextureTarget_h_
