[Bug 15636] Colin McRae Rally 2.0 draws no background during race - missing DXT/S3TC decompression

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=15636





--- Comment #10 from Jörg Höhle <hoehle at users.sourceforge.net>  2009-04-21 03:56:53 ---
>if you're forcing S3TC support on, and your hardware doesn't support
>it, it shouldn't change the behaviour of your app
AFAIK, my hardware supports decompression, but not compression.  The former is
apparently all that's needed for this particular application.  The referred URI
further reads: "you will get errors if applications try to use
online-compression (like QuakeIII does)".

BTW, somewhere I read that it could be that MS-Windows' D3D drivers would
report the S3TC capability even on my hardware.  That would make CMR2 run
there.  So the force_s3tc_enable option gets wine closer to MS-Windows'
behaviour.  It's not to be frowned upon.  Material for wine-wiki?

>I think your glxinfo would be interesting here. If they're different
As I said, they are.  A single additional capability is output, something
xyz_s3tc (from memory, I cannot check right now).  Must be
ext_texture_compression_s3tc as it's this one wine checks in
dlls/wined3d/directx.c.

>There's something else going on here.
Well, what's puzzled me is the following quote from
http://dri.freedesktop.org/wiki/S3TC
"force_s3tc_enable... This may be of use for some games which require S3TC or
don't use the ARB_texture_compression extension correctly."
So there would be some correct use of ARB_texture_compression (which wine
should thus implement) that does not depend on this option?!?  I could not find
further information on this.

The two pages about S3TC are not clear enough, IMHO.  It took me some time
after initially reading them to combine that it would benefit CMR2.

>bug 14939 is reported with an nvidia card
Yes, much to my surprise.  NVidia is probably supported by CMR2 (I will look up
the package cover).  Does the CMR2Demo (URL in top template) work for you with
NVidia?


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