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//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2008 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  OpenFlipper is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
// 
//  OpenFlipper 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 Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
//   $Revision$
//   $Author$
//   $Date$
//
//=============================================================================




//=============================================================================
//
//  CLASS ColorTranslator
//
//=============================================================================

#ifndef ACG_COLORTRANSLATOR_HH
#define ACG_COLORTRANSLATOR_HH


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


#include "gl.hh"
#include "../Math/VectorT.hh"


//== NAMESPACES ===============================================================


namespace ACG {


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


/** This class can be used to translate colors to integers. Use this
    e.g. for color index picking, i.e. drawing objects using a color
    corresponding to an unique index.
*/
class ACGDLLEXPORT ColorTranslator
{
public:
   
  /// Default constructor.
  ColorTranslator() : initialized_(false) {};
   /// Destructor.
  ~ColorTranslator() {};

  
  /// init (takes current GL context)
  void initialize();
  /// has it been initialized?
  bool initialized() const { return initialized_; }


  /// index -> color (one buffer)
  Vec3uc index2color(unsigned int _idx) const;
  /// color -> index (one buffer)
  int color2index(Vec3uc _rgb) const;


  /// returns maximal convertable index
  unsigned int max_index() const;
  
  
private:

  bool     initialized_;
  GLint    red_bits_, green_bits_, blue_bits_;
  GLuint   red_mask_, green_mask_, blue_mask_;
  GLuint   red_shift_, green_shift_, blue_shift_;
  GLuint   red_round_, green_round_, blue_round_;
};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_COLORTRANSLATOR_HH defined
//=============================================================================