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/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
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 *      Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen      *
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 *                           www.openflipper.org                             *
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 *  This file is part of OpenFlipper.                                        *
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\*===========================================================================*/

/*===========================================================================*\
 *                                                                           *
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 *   $Revision$                                                       *
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 *   $Author$                                                      *
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 *                                                                           *
\*===========================================================================*/
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//=============================================================================
//
//  CLASS PBuffer
//
//=============================================================================
#ifdef ARCH_LINUX
//=============================================================================


#ifndef ACG_PBUFFER_HH
#define ACG_PBUFFER_HH


//== INCLUDES =================================================================

#include <GL/glxew.h>
#include <../GL/gl.hh>
#include <vector>
#include "../Config/ACGDefines.hh"


//== CLASS DEFINITION =========================================================



/** \class PBuffer PBuffer.hh <ACG/Utils/PBuffer.hh>
  Sets up a pbuffer and provides functions for working with it. Per
  default the pbuffer is double-buffered, 8-bit rgba values, 24-bit
  depth and preserved contents.
*/
class ACGDLLEXPORT PBuffer
{
public:

  /// Default constructor
  PBuffer(int _bits);

  /** Constructor with arguments for pbuffer dimension.
      \param _w specifies the pbuffer's width in pixel.
      \param _h specifies the pbuffer's height in pixel.
  */
  PBuffer(int _w, int _h, int _bits);

  /// Destructor
  ~PBuffer();

  /** Change size of pbuffer by destroying it and recreating it with
      the desired width and height.
      \param _w specifies the pbuffer's width in pixel.
      \param _h specifies the pbuffer's height in pixel.
  */
  void resize(int _w, int _h);

  /** Activate the pbuffer. This means the pbuffer is the current rendering
      context and all subsequent OpenGL-commands are executed in this context.
  */
  void activate();

  /** Switch back to the original rendering context. No further OpenGL-commands
      are directed to the pbuffer.
  */
  void deactivate();

  /// Get current width of pbuffer.
  const int width() const;

  /// Get current height of pbuffer.
  const int height() const;

  int bits();


private:

  Display           *dpy_;
  GLXFBConfig       *fbc_;
  GLXPbuffer        pbuf_;
  GLXDrawable       currdraw_;
  GLXContext        currctx_, pbufctx_;
  std::vector<int>  sbAttrib_, pbAttrib_;
};


//=============================================================================
#endif // ACG_PBUFFER_HH defined
//=============================================================================
#endif // Linux only
//=============================================================================