[Bug 22667] Settlers II - 10th Anniversary demo crash if you change shadows details

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=22667

Matteo Bruni <matteo.mystral at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |matteo.mystral at gmail.com

--- Comment #7 from Matteo Bruni <matteo.mystral at gmail.com> 2013-06-28 09:41:22 CDT ---
I've spent some time on this bug and now I think this is a driver bug.
It works fine for me on a Radeon HD 5650M with Mesa drivers and on an GeForce
GTX 470 with binary drivers. It crashes on a GeForce 6200 with binary drivers
with glibc complaining about memory corruption in a memory area pertaining to
the GL library.

The game creates and uses a D3DFMT_R16_FLOAT texture to draw the shadow-related
info into. On the 6200, the game crashes a bit after using that texture as a
render target for the first time. If I force the game to use a RGBA8 texture
instead all works fine (although the shadows show a number of artifacts caused
by the reduced texture precision, as expected). Another test I did was to
create a trace with apitrace on the GTX 470 and replay it on the 6200: it
crashed as well.

The OP has an Intel GPU, so he's using a different driver of course. In his
case though the drivers are apparently compiled without float textures support
and that probably explains his issues.

So, again, I think this is essentially a driver bug triggered by that 16-bit
float texture (and some other render state which I couldn't identify), probably
present on Nvidia GPUs up to GeForce 7xxx. I'll be thankful if someone could
try the demo and confirm (or refuse) this analysis.

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