Marc Erich Latoschik (marcl++at++TechFak.Uni-Bielefeld.DE)
Thu, 15 Jul 1999 12:11:45 +0200
> I have the same configuration on my deskside.
>
> >
> > My first idea was pretty handy, we have two channels, so why
> > not using one for my desktop and one to render my gfx to
> > a Marquee Beamer...Ok, wanted to have 2x1280x1024_96s on
> > a 2560x1024 FB, but this didn't work.
>
> Been there!
> I use 1280x1024_114s format when I want stereo, and any Electrohome
> Marquee 8500/9500 should be able to handle this. The 21" CRT from SGI
> cannot handle this stereo format (1024x768_96s seems to be tops for it) so we
Hi, thanks for your help,
we are using the wide 24" CRT, so i was hoping that one can cope with
1280x1024_114s...
but with its possible 96kHz, i think it can neither.
>
> usually sit in front of the 'big screen' instead of the tube. I also tried
> to
> use the two channels to set up two different display options, but there
> is not enought bandwidth in the one RM board (actually we have tried
> 2 RMs in the VET Center, and there is still not enough bandwidth). The
> solution is to sit in front of the projector, or use an external video
> splitter
Good hint about the 2RM configuration, i was about to order a 2nd RM ;),
but it won't help...(in this case)
Using a video splitter? Puhh, i upgraded from the octane knowing that i
have
a dual channel option and could get rid of the splitter!!! But of course
you
are right, maybe my expectations had been a little too high...
> on one channel to drive the projector and a CRT monitor (that is, if you
> can find a monitor that can handle this format).
You are using channel0 as input for the splitter right? Because with
ircombine
channel1 alone can not be configured.
>
> We sit in front of the screen and use an .auxchestrc option to switch
> from mono to stereo via ircombine non-gui commands.
>
> Menu Util
> {
> "1280x1024++at++114s" f.checkexec.sh "/usr/gfx/ircombine -destination
> active -channel 0 format=/usr/gfx/ucode/KONA/dg4/vfo/1280x1024_114s.vfo"
> "1600x1200++at++60" f.checkexec.sh "/usr/gfx/ircombine -destination
> active -channel 0 format=/usr/gfx/ucode/KONA/dg4/vfo/1600x1200_60.vfo"
> }
nice goodie, thx
>
> >
> > The problem is that with ircombine, the amount of FB used for
> > quadbuffered is not shown...,am i right with that?
> > Does that mean if i want to use quadbuffer stereo, i have to
> > reserve the doubled amount of what ircombine reserves for the
> > channels on the FB?
>
> Hmmm. I usually get a good indication from ircombine whenever I select
> stereo/mono formats. Is that what you mean?
No, the problem is that when you use quad-buffer stereo, it appears to
me that you
can only use stereo channel configurations that only use 1/2 of the
framebuffer.
The other half is used by the (not seen in ircombine) second dualbuffers
(hence quad).
With old stereomode, the framebuffer is partitioned in two halfs anyway,
reducing the
actual vertical resolution.
Can anyone confirm that?
>
> >
> > I tried it with 640x480_96s and the attributes were:
> >
> > fbAttrs[] = {
> > PFFB_RGBA,
> > PFFB_DOUBLEBUFFER,
> > PFFB_STEREO,
> > // PFFB_DEPTH_SIZE, 24,
> > PFFB_RED_SIZE, 1,
> > PFFB_STENCIL_SIZE, 1,
> > PFFB_SAMPLES, 1,
> > None,
> > };
>
> Looks OK to me. Look at the Performer sample source spacefly.C
Works ok for my friends (with a 4pipe "lots of RM") too, so it should
work here too, the question is the following:
Does multisampling uses additional FB- resources that i have to keep
in mind when i try to configure it?
> >
>
> We all started at the beginning just like you. Hope I could help a bit.
>
Yep, after some years of performer i thought i got it finally, but
IR mix me up a little :)
thx
--bye Marc
************************************************************************** Marc Erich Latoschik, AG-WBS, Technische Fakultaet, Universitaet Bielefeld Universitaetsstrasse 25, PO 100 131, 33501 Bielefeld Room M4-122 Tel: (0521) 106 2919, Fax: (0521) 106 2962, marcl++at++techfak.uni-bielefeld.de http://www.TechFak.Uni-Bielefeld.DE/techfak/persons/marcl/
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