[Nouveau] [Bug 95095] NV46 (G72) Full screen artifacts in Freespace 2 SW OT mod

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95095

--- Comment #4 from Mauro Rossi <issor.oruam at gmail.com> ---

The attachment was related to a freeze-lockup, even if it's most probably a
different problem.

> If you are involved with the development of this application, could you
> verify that it never uses a 32-bit color buffer with a 16-bit depth buffer,
> or a 16-bit color buffer with a 24-bit depth buffer? (That's RGBA8 + Z16 or
> RGB565 + Z24.) Those combinations, while perfectly legal in GL, are not
> actually supported by the hardware, and the driver "works around it" by just
> disabling depth, which results in broken rendering (but at least no
> hangs...).

I'm not involved in fs2_open project, I'm contributing to Star Wars mod testing
on Linux,

but I found something interesting, using the NV30_SWTNL=1 parameter, I could
cycle all models and get trace to qapitrate retrace all the sequence with hwtnl
and ...

...  just some specific 3D models produce z-culling artifacts, where parts of
the 3D model, like the X-Wind hull, are put extremely "in the front" hiding
everything, while other 3D models are perfectly rendered.

I'm going to check with 3D model owners if there is a way to correct the
impacted 3D models.

Thanks a lot Ilia!

I'll report back when I found the exact cause of the problem.

> Lastly, please ensure you're using a semi-recent mesa...

I'm testing with mesa git (oibaf ppa)

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