Re: Going big and stereo

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Angus Dorbie (dorbie++at++sgi.com)
Thu, 21 May 1998 17:03:56 -0700

Chris Jackson wrote:
>
> On Thu, 21 May 1998, Angus Dorbie wrote:
>
> >
> > Configure your managed area download ot eeprom, restart graphics and use
> > findvis or glxinfo to list supported visuals.
>
> Yes, this is where I am hitting a wall. If I restart the graphics with
> 1900x1200 downloaded to eeprom, the list of available stereo visuals is
> very slim. I get basically two visuals with stereo, and neither have
> doublebuffers. This is to be expected, though, since I am confined to
> a "tiny" pixel depth at 1900x1200.
>
> Without the appropriate visuals, I am resigned to implementing full
> screen stereo. The problem is, not even STR_BOT or STR_RECT seem to be
> giving me stereo buffers.
>
> >
> > If you can configure a managed area that size yes, but you would have to
> > compile
> > a video format and then all you've done is half the vertical resolution
> > in each
> > field so you've actually only got 1900x600 with old style stereo, (munus
> > any
> > blanking lines between fields)
>
> Am I correct in thinking that this vfo would be for a
> STR_RECT flavor? In this format I draw both to the top
> half and the bottom half of the screen, and the images are superimposed
> when I call setmon.

Yes, but look at your options, each field would have half the vertical
resolution, ie half the lines. You might as well half the vertical
resolution
of the managed area and get deeper pixels for use in a double buffered
modern
stereo in a window vof.

>
> > >
> > > At this point, I'm willing to use any resolution and any video field
> > > rate...
> >
> > But what about your display, you started by saying that your display
> > must
> > be configured to 1900x1200.
> >
>
> Yes, this is root of the problem. But, what I am planning on doing is
> implementing a stereo toggle option. So my application will initially
> run with the 1900x1200 display. Should stereo be switched on, I'll
> switch to an appropriate video format and run the stereo image full
> screen.
>
> But that is later down the road, at this point I would be happy getting
> any kind of stereo running given that the managed aread must be
> 1900x1200.
>
> Actually, I've got stereo applications for quad-buffered stereo and
> top/bottom stereo in GL, OpenGl, and Performer. They all work great if
> I start the X server with a defualt of 1280x1024. But as soon as I
> gfxstop and gfxstart with 1900x1200 saved to eeprom, none of my stereo
> examples work.
>
> Is old style STR_RECT a viable option, given my hardware restraints
> and the excessive managed area?
>
> Thanks for all the insight and great advice...
>
> Chris Jackson
> Applied Research Laboratories - University of Texas at Austin

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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