JAVIER CASTELLAR (javier++at++mar.madrid.sgi.com)
Mon, 6 Feb 1995 13:38:47 -0800
The first reason is becasue Extreme color framebuffer is 24 bits, then
in double buffer is 12+12. One quick solution will be work in singlebuffer and
then grab it.
One second reason appear if you are not using antiliasing. One cheap
way to make it work w/o ANY flicker is to use the Galileo Video option (an
optional hardware). It will give to you full screen hardware anti-flicker as
well as all video related adjustments. It is really easy to create a VERY GOOD
NO FLICKER image using his REAL TIME CONVERSION.
If you use Galileo (it is an SGI board) it gives to you YUV output in
realtime (it means that you do NOT need to grab to memory or disk the frame
buffer), saving you LOT of time (no ethernet or scsi involve). If you wish even
better quality you can use the CIR601 option over the galileo to get CIR601
4:2:2 video.
Extreme framebuffer
-->Galileo fieldbuffers (real time antiflicker)
-->Video signal(YUV or even CIR601)
Note there is no need of any snapshot, it is a video path (real time).
The only time expended is the time you need to actually render the image.
Hope this helps.
-Javier
-- ******************************************************************** * Javier Castellar * Email: javier++at++madrid.sgi.com * * Systems Engineer * Vmail: x59665 * * Gfx guru * Phone: ++34-1-4429077 * * Silicon Graphics Spain* Fax: ++34-1-4420150 * ******************************************************************** Nobody said that the life was a fair play Javier Castellar
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