[Bug 14939] Black & White: DXTC to ARGB converter not implemented

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=14939

--- Comment #28 from Ben Klein <shacklein at gmail.com> 2011-03-23 07:50:29 CDT ---
(In reply to comment #27)
> Hello Ben, I hope you're enjoying Black & White - it's been a long time coming.
> 
> 1) The XRGB1555 -> DXT135 compression algorithm is no longer essential to
> running Black & White, as it's only used to compress the screenshots into
> thumbnails when one saves a game. The crashes were caused by a shoddy
> implementation of DirectDraw blitting (used when making these savegame
> screenshots), Zdenek Behan has provided a hack that bypasses blitting. In the
> HowTo I have included all 3 patches needed for playing Black & White on Wine.

Thanks :)

> 2) Personally I think this patent fear is nonsense, since only a backwards,
> oppressive and capitalist legal climate as in the U.S. would allow patents to
> kill innovation.

I agree with you. I'd even argue that implementing the S3TC algorithms from
scratch is not a patent violation as long as you don't reverse-engineer. But
I'm not a patent expert, an nor are the wine devs, so as it stands this sort of
software decoder won't get into wine upstream.

> If you like, I could write a patch to hook into libtxc_dxtn,
> though there are two concerns: A) the overhead produced by converting the 16
> bit textures to 32 bit (libtdx_dxtn works with 32 bit textures) and then
> performing a function call to libtdx_dxtn.so would be just silly and

I suggested it mainly because it'd be more likely to be accepted by AJ.

> B) the
> Mesa guys are finally turning on the light in their attics and are discussing
> providing DXT support natively in Mesa (
> http://lists.freedesktop.org/archives/mesa-dev/2011-March/005826.html ). 
> I'll push a patch to provide fast, direct compression / decompression of 16 bit
> (A)RGB textures to Mesa when they've completed the merger.

This is good news then :) Something to keep an eye on.

> For now, just follow the HowTo on the AppDB page and you're good to go. If you
> want an online match sometime, give me a yell! My rhino is feeling lonesome. =(

Poor rhino!

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