http://bugs.freedesktop.org/show_bug.cgi?id=24207
Summary: Extension for S3TC decompression only
Product: Mesa
Version: git
Platform: All
URL: http://trac.wildfiregames.com/ticket/313
OS/Version: All
Status: NEW
Severity: enhancement
Priority: medium
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: fabio....@libero.it
There are some games that require the S3TC extension but use it only for
decompressing texture. Full S3TC requires libtxc_dxtn, but decompression only
S3TC is supported also without it.
When using games using only S3TC decompression, but when not using libtxc_dxtn,
one can force S3TC with driconf, however:
a) that won't work for all games;
b) it's not very practical to do (think at millions of users that should enable
it this way);
It would be nice if a Mesa specific extension would be added to declare
availability of S3TC for decompression only. The game that uses decompression
only S3TC could then check for both S3TC and Mesa specific extension, and, if
at least one of the two is supported, enable S3TC decompression.
See also this ticket [0] on 0 A.D. game [1] support site:
"maybe we could detect the situation where we're running on Linux and the
driver really does support decompression even though it doesn't claim to fully
support S3TC, since the game should actually run fine with S3TC in that case
and we don't need to tell the user to do anything."
According to [2]: "Without S3TC support, the game will uncompress all of its
textures before using them, which causes it to use between 4 and 8 times as
much memory (and video memory) and will probably slow it down a lot. "
[0]: http://trac.wildfiregames.com/ticket/313
[1]: http://os.wildfiregames.com/
[2]: http://trac.wildfiregames.com/ticket/306#comment:4
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