Mike Stephens (stephens++at++zeus.wes.army.mil)
Mon, 3 Mar 1997 22:58:54 -0600 (CST)
i was looking in the performer programmer's guide (page 176) where it's
talking about process callbacks for refining the drawing process.
it has a PreDraw that does clearing etc. then pfDraw() and then a
PostDraw() to "draw HUD, read Iris GL devices etc."
what i want to do is to draw this HUD infomation using openGL.
i tried as a first attempt just plastering a polygon on over the scene.
well i got nothing but the scene as drawn by pfDraw().
what do i do to add this HUD graphics using openGL?
perhaps related to this is when does the swapbuffers occur?
does pfDraw() do this? that could explain my results but goes against
the implication of the manual...
thanks,
mike
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