Angus Dorbie (dorbie++at++sgi.com)
Fri, 17 Jul 1998 10:25:37 -0700
The real gain is for genlocking. You must genlock for good performance,
especially at high frame rates, and it looks better.
When on a single host there's a marginal benefit for genlocking the
pipes. The real win for genlock is when you have two separate machines,
and so the additional communications latency for the swap sync
eliminated
>
> Also, exactly how does one cable up a two (or n) pipe machine
> to SWBUFFERS_HW ? I've gone through the archives, Onyx hw docs,
> etc. And despite finding some info, even a recent thread on
> info-performer. I'm still uncertain...
Once you have daisychained the genlock you can wire all pipe swapreadys
on a single wire. Here,s a 3 pipe example:
PIPE 0 PIPE 1 PIPE 2
[ ] []GEN IN []GEN OUT []GEN IN []GEN OUT
\ / Video / \ / \/
\ / out / \_________/ 75 Ohm
||\ / terminator
||\\___________/
|| \ H/C wire with
|| \ Composite Sync
Swapready Swapready Swapready
[] [] []
\ \ /
\______________________\_____________________/
T Junction
Cheers,Angus.
-- "Only the mediocre are always at their best." -- Jean GiraudouxFor advanced 3D graphics Performer + OpenGL based examples and tutors: http://www.dorbie.com/ ======================================================================= List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/ Submissions: info-performer++at++sgi.com Admin. requests: info-performer-request++at++sgi.com
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