Using RGBwritemask with Performer

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Michael J. Williams (mwilliam++at++ldsa.com)
Thu, 5 Oct 1995 18:01:27 +0500

   I am hoping to use Performer to manage some models over top of
a detailed background. The plan is to draw the background (having
about 30 colors) and then use RGBwritemask to protect it. We want
to then use the remaining bitplanes to draw our models (5 colors)
as fast as possible without having to keep drawing the background.

   Has anybody implemented a system this way (using RGBwritemask
in effect to get an underlay plane with more than 4 colors)?
The GL manual suggests that this can be done, but will Performer
prevent us from doing this?

   We are on an Indigo2 Extreme, running IRIX 5.2, and Performer
1.2. We are currently drawing the background, and using lrectread/
lrectwrite to save it, and then restore it at the beginning of each
frame. The lrectwrite takes 120 milliseconds, and is killing our
timing.

Thanks
Mike Williams
mwilliam++at++ldsa.com

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