/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2012 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : include/ICLQt/GLFragmentShader.h                       **
** Module : ICLGeom                                                **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** Commercial License                                              **
** ICL can be used commercially, please refer to our website       **
** www.iclcv.org for more details.                                 **
**                                                                 **
** GNU General Public License Usage                                **
** Alternatively, this file may be used under the terms of the     **
** GNU 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 GNU General Public License  **
** version 3.0 requirements will be met:                           **
** http://www.gnu.org/copyleft/gpl.html.                           **
**                                                                 **
** 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.                                          **
**                                                                 **
*********************************************************************/

#ifndef ICL_GL_FRAGMENT_SHADER_H
#define ICL_GL_FRAGMENT_SHADER_H

#include <ICLUtils/Uncopyable.h>
#include <ICLUtils/Exception.h>

namespace icl{
  /// Simple wrapper class for OpenGL 2.0 Fragment Shader Programs
  /** The GLFragmentShader class can be used to create simple fragment shader programs.
      
  */
  class GLFragmentShader : public Uncopyable{
    struct Data;
    Data *m_data;
    
    void create();
    
    public:
    GLFragmentShader(const std::string &program, bool createOnFirstActivate=true) throw (ICLException);
    ~GLFragmentShader();
    
    void activate();
    
    /// deactivates the shader
    /** This function does not do anything, if the shader was not enabled before! */
    void deactivate();
    
    /// creates a deep copy of this shader
    /** The resulting copy does only use this instance's program string and is other than this
        independent. The copy is created in createOnFirstActivate mode */
    GLFragmentShader *copy() const;
  };
}

#endif