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Inquisitor
05-21-2004, 09:32 PM
One of my testers reported a problem with the
Matrox Millennium G550, driver version 6.83.017,
Windows98 SE.
My app crashes during OpenGL initialization.
Nothing special in there though:
32bit colors, 16 bit zbuffer, no stencil buffer.
It is so far the one and only system my app isn't
working properly, and I tested many.
Anyone here got similar problems with a G550
or older Matrox cards?

kehziah
05-23-2004, 02:43 PM
Matrox can be considered a worst-case scenario for an OpenGL app. Got plenty of problems with a G400. I finally gave up and bought a new card.
Regarding your specific problem : are you sure your init code is 100% fool-proof? Do you use extensions? It would be interesting to refine your error-checking to find which call crashes.
Anyway, use as few exotic features as possible on those cards, or you will sooner than later run into driver bugs.

Inquisitor
05-24-2004, 03:58 AM
The only extension I'm using is glVertexPointerEXT (and related).
I don't think those can be called "exotic"...
Anyway, you're right:
I'll start building a special version logging every function call to track the error down.
In case it is a problem with the vertex arrays I'll give up and tell my customers they shall
buy a decent card ;)

Inquisitor
05-24-2004, 11:43 AM
Well, I tracked it down to a simple (valid) call to glDrawElements!
I can't believe this #?&%$-card has extreme problems with something that basic!
To illustrate it a bit more: I activate and set the pointers to a vertex-, texcoord- and normal-array (functionpointers are valid).
And directly after that glDrawElements (again, all parameters perfectly valid) fails, killing the entire process.

Thanks to Matrox for their great drivers! :mad:

yooyo
05-24-2004, 11:28 PM
Did you call glEnableClientState(...) for all uset attributes(vertex, normal, texcoord)?

yooyo

Inquisitor
05-24-2004, 11:47 PM
Sure!
For now I wont waste more time onthis!
Whenever I encounter "matrox" in the vendor string I'll bail out...
Better than crashing!

Thanks and cheers!

Obli
06-04-2004, 05:35 AM
I once had an app which ran correctly on every system I tested it but one with G400.
The problem: it was rendering only on the top half part of the screen.
Wow.