Phil Keslin (philk++at++cthulhu.engr.sgi.com)
Thu, 15 Jul 1999 10:13:19 -0700
I have one up front question. Is your system an InfiniteReality or a
Reality? I ask this because there is a significant difference in the
amount of framebuffer storage available on each system given the same
board configuration (the Reality has half the storage of the IR).
Marc Erich Latoschik wrote:
>
> Simon Mills wrote:
>
> >
> > Actually I've been using 1024x768_96s quadbuffer stereo happlily on an
> > Octance MXE also.
>
> Yes, on a MXE it will work, but quadbuffer needs at leas a high impact
> (says the man page), we tried it on an SI with texture addon, that is
> equal to a normal impact & texture. The minimum would be a SSI or SSE.
You only get 5 bits per component and you need two rasterizers which is
available only on SSE and MXE (High IMPACT or higher). I believe (and I
could be mistaken) that the SSI has only one rasterizer.
> >
> > To give you an idea what's possible we're successfully driving a
> > Electrohome Marquee 7500 and monitor with a single 1280x1024_96s stereo
> > ouput from one channel fed through a video splitter. For our application
> > we just wanted the same output of both projector/monitor. Rendering 2
> > channels in stereo would have been prohibitively slow. We have a iR2
> > with 2 RM's. BTW, to do this I had to ditch the very nice 24" SGI
> > monitor, which couldn't cope with this video format (I guess because of
> > the fact that it's very wide), and use another monitor with higher max
> > horizontal freq (a Philips Brilliance 201B).
>
> We are using a Marquee 8000, i think you are only using channel0, am i
> right?
> Or are both channels using the same FB-area?
>
> >
> > >
> > > fbAttrs[] = {
> > > PFFB_RGBA,
> > > PFFB_DOUBLEBUFFER,
> > > PFFB_STEREO,
> > > // PFFB_DEPTH_SIZE, 24,
> >
> > I use PFFB_DEPTH_SIZE, 23 because of the iR's rather strange looking
> > 23bit Z-buffer. Works on other systems too because you ask for at least
> > this amount.
>
> You are using 23 even if it looks strange?
>
> >
> > > PFFB_RED_SIZE, 1,
> > > PFFB_STENCIL_SIZE, 1,
> > > PFFB_SAMPLES, 1,
> >
> > If I'm on a multisampling machine (iR, RE2) I request PFFB_SAMPLES, 4.
>
> I tried that before, no difference.
>
> >
> > This works for me, although I have 2 RM's. You can also try the
> > "findvis" program to see which X visual's you have available and then
> > explicitly selecting one of those visuals like the perfly -t <visual_id>
> > option.
> >
> good point, ;) i'll try that too.
Or the new and improve glxinfo.
-- Phil Keslin <philk++at++engr.sgi.com>
This archive was generated by hypermail 2.0b2 on Thu Jul 15 1999 - 10:13:24 PDT