//
//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
//   with this source distribution. 
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program 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 General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#include "GLUtils.h"

# ifdef WIN32
#  include <windows.h>
# endif
# ifdef __MACH__
#  include <OpenGL/gl.h>
# else
#  include <GL/gl.h>
# endif
#include <string.h>

int isExtensionSupported(const char *extension)
{
  const GLubyte *extensions = NULL;
  const GLubyte *start;
  GLubyte *where, *terminator;

  /* Extension names should not have spaces. */
  where = (GLubyte *) strchr(extension, ' ');
  if (where || *extension == '\0')
    return 0;
  extensions = glGetString(GL_EXTENSIONS);
  /* It takes a bit of care to be fool-proof about parsing the
     OpenGL extensions string. Don't be fooled by sub-strings,
     etc. */
  start = extensions;
  for (;;) {
    where = (GLubyte *) strstr((const char *) start, extension);
    if (!where)
      break;
    terminator = where + strlen(extension);
    if (where == start || *(where - 1) == ' ')
      if (*terminator == ' ' || *terminator == '\0')
        return 1;
    start = terminator;
  }
  return 0;
}

void *glutils_extgl_GetProcAddress(const char *name)
{
#ifdef _WIN32
    void *t = wglGetProcAddress(name);
    return t;
#else
	return NULL;
#endif
}