static extern byte aglGetCGLContext(AGLContext ctx, void** cgl_ctx);

 [DllImport(agl)] static extern byte aglTexImagePBuffer (AGLContext ctx, AGLPbuffer pbuffer, int source);

 [DllImport(agl)] static extern byte aglGetPBuffer (AGLContext ctx, AGLPbuffer *pbuffer, int *face, int *level, int *screen)  ;

 internal static extern byte aglSetInteger(AGLContext ctx, ParameterNames pname, int []@params);

 /*
  ** Font function
  */
  // TODO: face parameter should be of type StyleParameter in QuickDraw.
 [DllImport(agl)] static extern byte aglUseFont(AGLContext ctx, int fontID, int face, int size, int first, int count, int @base);

 [DllImport(agl)] static extern int aglGetVirtualScreen(AGLContext ctx);

 [DllImport(agl)] internal static extern byte aglDisable(AGLContext ctx, ParameterNames pname);

 internal static bool aglDestroyContext(AGLContext context)
 {
     return (_aglDestroyContext(context) != 0) ? true : false;
 }

 [DllImport(agl)] static extern byte aglCopyContext(AGLContext src, AGLContext dst, uint mask);

 /*
  ** Context functions
  */
 [DllImport(agl)] internal static extern AGLContext aglCreateContext(AGLPixelFormat pix, AGLContext share);

 [DllImport(agl,EntryPoint="aglDestroyContext")] static extern byte _aglDestroyContext(AGLContext ctx);

 internal static extern bool aglGetInteger(AGLContext ctx, ParameterNames pname, out int param);

 static extern bool aglIsEnabled(AGLContext ctx, GLenum pname);

 internal static extern bool aglDisable(AGLContext ctx, ParameterNames pname);

        internal static void aglSetFullScreen(AGLContext ctx, int width, int height, int freq, int device)
        {
            byte retval = _aglSetFullScreen(ctx, width, height, freq, device);

            if (retval == 0)
            {
                AglError err = GetError();
                Debug.Print("AGL Error: {0}", err);
                Debug.Indent();
                Debug.Print(ErrorString(err));
                Debug.Unindent();

                throw new MacOSException(err, ErrorString(err));
            }
        }

 [DllImport(agl)] internal static extern byte aglUpdateContext(AGLContext ctx);

 /*
  ** Virtual screen functions
  */
 [DllImport(agl)] static extern byte aglSetVirtualScreen(AGLContext ctx, int screen);

        /*
         ** Current state functions
         */
        #region --- aglSetCurrentContext ---

        [DllImport(agl,EntryPoint="aglSetCurrentContext")] static extern byte _aglSetCurrentContext(AGLContext ctx);

 /*
  ** Swap functions
  */
 [DllImport(agl)] internal static extern void aglSwapBuffers(AGLContext ctx);

 static extern byte _aglSetDrawable(AGLContext ctx, AGLDrawable draw);