On Tue, Apr 10, 2001 at 09:42:11AM -0700, [EMAIL PROTECTED] wrote:
> On Tue, Apr 10, 2001 at 10:02:53AM -0600, Brian Paul wrote:
> > David Geldreich wrote:
> > >
> > > Hello all,
> > >
> > > I am wondering if there is any plan to support quad-buffering in
> > > DRI.
> > >
> > > GL_FRONT_LEFT
> > > GL_BACK_LEFT
> > > GL_FRONT_RIGHT
> > > GL_BACK_RIGHT
> > >
> > > One of the problems is keeping the flipping of LEFT/RIGHT in sync
> > > with the vertical retrace. If you miss one, you will have right/left
> > > view swaped with your lcd shutter glasses.
> > >
> > > I am asking this, because I am currently building a VR solution
> > > based on linux PC instead of buying SGI Onyx machine. Doing stereo
> > > without quad-buffering support will be a little more painful.
> >
> > There are no plans to implement stereo at this time.
> >
> > I'm not sure which PC cards would support it. Furthermore, if there
> > is a card that does support quad-buffer stereo, does it support it
> > per-window or only full-screen?
> >
>
> The FireGL2 supports quad buffer stereo with per-window. Unfortunately it
> does not support stereo on linux, with their closed-source drivers.
I think I have demonstrated that you don't need any special support from
the card in order to have quad buffered per-window stereo. Some operations
are rather hard to do hardware-accelerated unfortunately, like rendering
into more than one buffer simultaneously while using certain depthtesting
modes for example, but I don't think that would be very useful in the
first place.
Anyway, as I have mentioned before on this list I have a proof of concept
patch at http://www.lysator.liu.se/~ehliar/3d/
It has a couple of rough edges which I haven't removed yet. It will probably
not apply cleanly to the latest tree either. Perhaps I'll take another
look at it after XFree86 4.1.0 is out. (I wrote it mostly to see if it
could be done and wether I could do it myself, so polishing up the last
details is not that high on my TODO-list I'm afraid.)
regards
Andreas Ehliar
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