text: //========================================================================
  // GLFW - An OpenGL framework
  // Platform:    Win32/WGL
  // API version: 2.7
  // WWW:         http://www.glfw.org/
  //------------------------------------------------------------------------
  // Copyright (c) 2002-2006 Marcus Geelnard
  // Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
  //
  // This software is provided 'as-is', without any express or implied
  // warranty. In no event will the authors be held liable for any damages
  // arising from the use of this software.
  //
  // Permission is granted to anyone to use this software for any purpose,
  // including commercial applications, and to alter it and redistribute it
  // freely, subject to the following restrictions:
  //
  // 1. The origin of this software must not be misrepresented; you must not
  //    claim that you wrote the original software. If you use this software
  //    in a product, an acknowledgment in the product documentation would
  //    be appreciated but is not required.
  //
  // 2. Altered source versions must be plainly marked as such, and must not
  //    be misrepresented as being the original software.
  //
  // 3. This notice may not be removed or altered from any source
  //    distribution.
  //
  //========================================================================
  
  #include "internal.h"
  
  #ifdef _MSC_VER
      #pragma warning(disable:4054)  // A function pointer is cast to a data pointer.
  #endif // _MSC8VER
  
  //************************************************************************
  //****               Platform implementation functions                ****
  //************************************************************************
  
  //========================================================================
  // Check if the current context supports the specified WGL extension
  //========================================================================
  
  int _glfwPlatformExtensionSupported( const char *extension )
  {
      const GLubyte *extensions;
  
      if( _glfwWin.GetExtensionsStringEXT != NULL )
      {
          extensions = (GLubyte *) _glfwWin.GetExtensionsStringEXT();
          if( extensions != NULL )
          {
              if( _glfwStringInExtensionString( extension, extensions ) )
              {
                  return GL_TRUE;
              }
          }
      }
  
      if( _glfwWin.GetExtensionsStringARB != NULL )
      {
          extensions = (GLubyte *) _glfwWin.GetExtensionsStringARB( _glfwWin.DC );
          if( extensions != NULL )
          {
              if( _glfwStringInExtensionString( extension, extensions ) )
              {
                  return GL_TRUE;
              }
          }
      }
  
      return GL_FALSE;
  }
  
  
  //========================================================================
  // Get the function pointer to an OpenGL function
  //========================================================================
  
  void *_glfwPlatformGetProcAddress( const char *procname )
  {
      return (void *) wglGetProcAddress( procname );
  }
  
  