GLContext.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLQt/src/ICLQt/GLContext.h                            **
** Module : ICLQt                                                  **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.GPL  **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/


#pragma once

namespace icl{
  namespace qt{
    

    class GLContext{
      public:
      typedef void* Handle;
      
      protected:
      
      Handle handle;
      
      bool isGLX;
      
      long unsigned int pbuffer;
      
      Handle display;
      
      static GLContext current_glx_context;
      
      public:
      GLContext():handle(0),isGLX(0){}
      

      GLContext(Handle handle, bool isGLX, long unsigned int pbuffer=0, Handle display=0):
      handle(handle),isGLX(isGLX),pbuffer(pbuffer),display(display){}
      
      static GLContext currentContext();
        

      static void set_current_glx_context(Handle handle, long unsigned int pbuffer, Handle display);
      
      // unsets the current GLXContext
      static void unset_current_glx_context();
      
      void makeCurrent() const;
      
      
      inline bool isNull() const { return !handle; }
      
      inline operator bool() const { return !isNull(); }
      
      
      // lt comparison (for strict ordering)
      inline bool operator<(const GLContext &other) const{
        if(isGLX == other.isGLX){
          return handle < other.handle;
        }else return isGLX;
      }
  
      inline bool operator==(const GLContext &other) const{
        return handle == other.handle && isGLX == other.isGLX;
      }      
      
    };
  } // namespace qt
}