/***********************************************************************
    created:    Wed, 8th Feb 2012
    author:     Lukas E Meindl (based on code by Paul D Turner)
*************************************************************************/
/***************************************************************************
     Copyright (C) 2004 - 2012 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 _CEGUIOpenGLRenderTarget_h_
#define _CEGUIOpenGLRenderTarget_h_

#include "CEGUI/RendererModules/OpenGL/RendererBase.h"
#include "../../RenderTarget.h"
#include "../../Rect.h"

#if defined(_MSC_VER)
#   pragma warning(push)
#   pragma warning(disable : 4251)
#endif

namespace CEGUI
{
  /*!
    \brief
      Intermediate OpenGL implementation of a RenderTarget.
  */
  template <typename T = RenderTarget>
  class OPENGL_GUIRENDERER_API OpenGLRenderTarget : public T
  {
  public:
    //! Constructor
    OpenGLRenderTarget(OpenGLRendererBase &owner);
    virtual ~OpenGLRenderTarget();

    // implement parts of RenderTarget interface
    void draw(const GeometryBuffer &buffer);
    void draw(const RenderQueue &queue);
    void setArea(const Rectf &area);
    const Rectf &getArea() const;
    void activate();
    void deactivate();
    void unprojectPoint(const GeometryBuffer &buff,
      const Vector2f &p_in, Vector2f &p_out) const;

  protected:
    //! helper that initialises the cached matrix
    virtual void updateMatrix() const;

    //! OpenGLRendererBase that created this object
    OpenGLRendererBase &d_owner;
    //! holds defined area for the RenderTarget
    Rectf d_area;
    //! tangent of the y FOV half-angle; used to calculate viewing distance.
    static const double d_yfov_tan;
    //! saved copy of projection matrix
    mutable mat4Pimpl *d_matrix;
    //! true if saved matrix is up to date
    mutable bool d_matrixValid;
    //! tracks viewing distance (this is set up at the same time as d_matrix)
    mutable double d_viewDistance;
  };

}

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

#endif

