Jeremy Friesner (jaf++at++chem.ucsd.edu)
Sun, 13 Jul 1997 15:11:41 -0700 (PDT)
I've got a Performer app that outputs two 640x486
pfChannels into the RE2 MCO frame buffer.
The video outputs from these channels are then fed into
a stereo multiplexer to form a single (frame-sequential)
stereo image on a TV screen. As I understand it, the
stereo multiplexer hardware more-or-less drops
every second row of pixels from each pfChannel.
With that in mind, I want to take some of the load off
of my draw process by to generating a 640x243 image
for each pfChannel, and then "zooming" the channel by
a factor of two vertically, so that each row of pixels
is duplicated on the next row, and the pfChannel
still fills the 640x486 area on-screen that the RE2 MCO
requires.
So--does anyone know how to do this with OpenGL/Performer,
in such a way that it wont take up more draw time then
just rendering every line the regular way would?
(hardware zoom, maybe??)
Thanks in advance for any suggestions,
Jeremy (who is cutting all corners in search of a better frame rate ;))
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