Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!ames!sgi!shinobu!odin!horus.esd.sgi.com!thant
From: thant@horus.esd.sgi.com (Thant Tessman)
Newsgroups: comp.sys.sgi
Subject: Re: Stereo sync
Keywords: stereo
Message-ID: <1990Dec3.181548.5300@odin.corp.sgi.com>
Date: 3 Dec 90 18:15:48 GMT
References: <17848@thorin.cs.unc.edu>
Sender: news@odin.corp.sgi.com (Net News)
Reply-To: thant@horus.esd.sgi.com (Thant Tessman)
Organization: Silicon Graphics Inc.
Lines: 15

In article <17848@thorin.cs.unc.edu>, certain@hatteras.cs.unc.edu writes:
> I am try to get a stereo display program to work on an Iris.  The problem
> that I am having is that to stereo plate flips between the left and right
> eye at 60Hz, so I need to make sure that I am alternating eyes with each
> buffer swap.  Unfortunately, swapbuffers() is non-blocking, so that if I
> can actually draw faster than 120Hz, I get two updates per buffer swap,
> which has the effect of always just showing one eye.  Is there a way to
> make swapbuffers() to be blocking?  Is there a way to know when the screen
> refresh happens?  What have other people done about this problem?  I have
> just subscribed to this newsgroup, so I don't know if this problem has been
> addressed previously.

gsync() might be what you need, at least to block on a refresh.

thant