text: #ifndef  __FREEGLUT_EXT_H__
  #define  __FREEGLUT_EXT_H__
  
  /*
   * freeglut_ext.h
   *
   * The non-GLUT-compatible extensions to the freeglut library include file
   *
   * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
   * Written by Pawel W. Olszta, <olszta@sourceforge.net>
   * Creation date: Thu Dec 2 1999
   *
   * 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
   * PAWEL W. OLSZTA 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.
   */
  
  #ifdef __cplusplus
      extern "C" {
  #endif
  
  /*
   * GLUT API Extension macro definitions -- behaviour when the user clicks on an "x" to close a window
   */
  #define GLUT_ACTION_EXIT                         0
  #define GLUT_ACTION_GLUTMAINLOOP_RETURNS         1
  #define GLUT_ACTION_CONTINUE_EXECUTION           2
  
  /*
   * Create a new rendering context when the user opens a new window?
   */
  #define GLUT_CREATE_NEW_CONTEXT                  0
  #define GLUT_USE_CURRENT_CONTEXT                 1
  
  /*
   * GLUT API Extension macro definitions -- the glutGet parameters
   */
  #define  GLUT_ACTION_ON_WINDOW_CLOSE        0x01F9
  
  #define  GLUT_WINDOW_BORDER_WIDTH           0x01FA
  #define  GLUT_WINDOW_HEADER_HEIGHT          0x01FB
  
  #define  GLUT_VERSION                       0x01FC
  
  #define  GLUT_RENDERING_CONTEXT             0x01FD
  
  /*
   * Process loop function, see freeglut_main.c
   */
   void     glutMainLoopEvent( void );
   void     glutLeaveMainLoop( void );
  
  /*
   * Window-specific callback functions, see freeglut_callbacks.c
   */
   void     glutMouseWheelFunc( void (* callback)( int, int, int, int ) );
   void     glutCloseFunc( void (* callback)( void ) );
   void     glutWMCloseFunc( void (* callback)( void ) );
  /* A. Donev: Also a destruction callback for menus */
   void     glutMenuDestroyFunc( void (* callback)( void ) );
  
  /*
   * State setting and retrieval functions, see freeglut_state.c
   */
   void     glutSetOption ( GLenum option_flag, int value ) ;
  /* A.Donev: User-data manipulation */
   void*    glutGetWindowData( void );
   void     glutSetWindowData(void* data);
   void*    glutGetMenuData( void );
   void     glutSetMenuData(void* data);
  
  /*
   * Font stuff, see freeglut_font.c
   */
   int      glutBitmapHeight( void* font );
   GLfloat  glutStrokeHeight( void* font );
   void     glutBitmapString( void* font, const unsigned char *string );
   void     glutStrokeString( void* font, const unsigned char *string );
  
  /*
   * Geometry functions, see freeglut_geometry.c
   */
   void     glutWireRhombicDodecahedron( void );
   void     glutSolidRhombicDodecahedron( void );
   void     glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale ) ;
   void     glutSolidSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale ) ;
   void     glutWireCylinder( GLdouble radius, GLdouble height, GLint slices, GLint stacks);
   void     glutSolidCylinder( GLdouble radius, GLdouble height, GLint slices, GLint stacks);
  
  /*
   * Extension functions, see freeglut_ext.c
   */
   void *  glutGetProcAddress( const char *procName );
  
   void  glutDropFilesFunc(void (*callback)(int, int, const char*, int));
  
  #ifdef __cplusplus
      }
  #endif
  
  /*** END OF FILE ***/
  
  #endif /* __FREEGLUT_EXT_H__ */
  