You probably know it already, but it is very easy to spawn opengl 
graphics directly from the toplevel using sdl. Then if you use the 
toplevel inside emacs, you get something very similar to the screenshots 
you had.

And since you are into screenshots, here is one :-)

http://www-fourier.ujf-grenoble.fr/~svungoc/prog/oplot/toplevel_plot.png

San