#does not work: GLX_XXX (like GLX_RGBA) are not exposed (GL/glxtokens.h)
# Red Book 2d ed. p. 476

if __name__ == '__main__':
    import sys
    sys.path.insert(0, '../../')
    from opengltk.extent import _glxlib
    from inspect import currentframe

    dpy = _glxlib.glXOpenDisplay()
    print '-->', currentframe().f_lineno
    #dpy = _glxlib.glxGetCurrentDisplay()
    screen = 0 # _glxlib.glxDefaultScreen( dpy)
    print '-->', currentframe().f_lineno
    vi = _glxlib.glChooseVisual( dpy, screen,
                           [_glxlib.GLX_RGBA,
                            (_glxlib.GLX_RED_SIZE, 1),
                            (_glxlib.GLX_GREEN_SIZE, 1),
                            (_glxlib.GLX_BLUE_SIZE, 1),
                            ])
    if vi:
        swap_flag = 0
    else:
        swap_flag = 1
        vi = _glxlib.glxChooseVisual( dpy, screen,
                               [_glxlib.GLX_RGBA, _glxlib.GLX_DOUBLE_BUFFER,
                                (_glxlib.GLX_GLXLIB_RED_SIZE, 1),
                                (_glxlib.GLX_GREEN_SIZE, 1),
                                (_glxlib.GLX_BLUE_SIZE, 1),
                                ])
    cx = _glxlib.glxCreateContext( dpy, vi, _glxlib.GLXContext_Null, 1)

    print 'some more X functions are missing to go further...'
    print 'see source in Red Book'
    
    _glxlib.glxXCloseDisplay( dpy)