/***********************************************************************
    created:    Sun Jan 11 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 _CEGUIOpenGLFBOTextureTarget_h_
#define _CEGUIOpenGLFBOTextureTarget_h_

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

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

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

//! OpenGLFBOTextureTarget - allows rendering to an OpenGL texture via FBO.
  class OPENGL_GUIRENDERER_API OpenGLFBOTextureTarget : public OpenGLTextureTarget
  {
  public:
    OpenGLFBOTextureTarget(OpenGLRendererBase &owner);
    virtual ~OpenGLFBOTextureTarget();

    // 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;

    //! allocate and set up the texture used with the FBO.
    void initialiseRenderTexture();
    //! resize the texture
    void resizeRenderTexture();

    //! Frame buffer object.
    gl::GLuint d_frameBuffer;
    //! Frame buffer object that was bound before we bound this one
    gl::GLuint d_previousFrameBuffer;
  };

} // End of  CEGUI namespace section

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

#endif  // end of guard _CEGUIOpenGLFBOTextureTarget_h_
