Richard Gallery (gallery++at++prl.research.philips.com)
Thu, 19 Sep 1996 18:13:19 +0100
Perhaps some-one can suggest a fix to a problem I have.
As I understand Performer, only the draw process is allowed
to have a GL context, and it is not possible to make GL calls from
another process. This appears to have been tightened up uner 2.0,
which I have just upgraded to.
I have some human animation libraries, which I have been using to
drive human characters in our Performer app, and up till our upgrade
recently all worked fine. Indeed, when we got our application going
again
under 2.0, in single process mode for de-bugging, it all works too,
although
quite a bit more slowly than we would like. So, then we turn on
multi-processing, and the problem appears.
What appears to happen is, that the animation libraries I use make some
gl calls. Now, all I do with these animation libraries is tell them
to play animation sequences, not to draw anything, i.e. they basically
interpolate keyframes,, without displaying the result,
and I then input the data straight into Performer DCS's in models
in order to actually animate the geometry.
Unfortunately, there appears to be some un-used but still called gl
functionality embedded in these animation libraries, as when I
even try to load the keyframe to interpolate I get system crashses, and
a stack trace shows me some calls to gl stuff going on.
So, I have several options to proceed, including moving all the calls
to
these libraries into the draw process, and using shared memory and
semaphores to communicate back to the application (messy and time
consuming), asking for re-compilations and re-writing of the libraries
that give the problem (maybe not even possible, definitely on a time
delay),
or, finding some way to allow gl calls in my application process.
The last one seems most attractive, tonight at least.
So, anyone know if it can be done
and how (allowing gl calls in the application process).
thanks for reading all this.
bye
-- Richard Gallery Philips Research Labs Cross oak Lane Redhill Surrey RH1 5HA01293-815167 fax 01293-815500 ======================================================================= List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/ Submissions: info-performer++at++sgi.com Admin. requests: info-performer-request++at++sgi.com
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