[Bug 14939] Black & White: DXT1 support not implemented

[wine-bugs at winehq.org]

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





--- Comment #5 from Ben Klein <shacklein at gmail.com>  2008-09-07 22:16:03 ---
After some research, I now understand more about the problem here. Wine can't
implement a DXTC/S3TC encoder without violating the S3TC patent, and probably
the same goes for a decoder.

A while ago in #winehackers someone suggested that this particular decoding
function could be offloaded to the GPU (when the appropriate functionality is
available). The process would be essentially:
1. Load S3TC texture into a PBO
2. GPU converts to ARGB
3. Wine reads back the converted texture from PBO

Of course, this won't work when the GPU doesn't support S3TC/DXTC textures.
I've been meaning to write a PoC for this, but haven't had the time. Comments?


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