Dividing up the screen

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Sandeep S. Mulgund (ssm++at++crasun.cra.com)
Thu, 12 Sep 1996 11:02:30 -0400

I'm developing a flight simulation app where I've divided up the screen
into two regions:

top half: out-the-window display & HUD
bottom half: in-cockpit instruments

I'm trying to figure out how to go about configuring viewports and windows,
etc. The only thing I've found so far that works is to set up a separate
pfChannel for the top & bottom halves.

Up until now I've been working on just drawing the out-the-window display
and HUD, and I had set up a single pfChannel with the viewport restricted
to the top half of the screen. This worked fine. When I added the second
pfChannel for the bottom half, I got a huge reduction in performance --
almost 40% slower frame rates, which is unacceptable. This is without even
actually drawing anything to the lower half of the screen!

Is there some alternate method I might use here? What I'd like to do is
restrict the viewport to the top half for drawing the OWD and HUD, and then
switch to the bottom half for drawing my instruments. Is this possible?
Is there some other channel/window configuration that will not give me such
a huge hit in speed?

Thanks,

Sandeep

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