[Mesa-dev] [PATCH 2/2] mesa: use the EXT_texture_compression_s3tc enable flag for all S3TC extensions

Philipp Klaus Krause pkk at spth.de
Mon Oct 29 02:47:10 PDT 2012

Am 28.10.2012 20:51, schrieb Kenneth Graunke:

> This makes sense to me.  The original reason for splitting out the ANGLE
> vs. EXT bits was that the ANGLE extension only requires decompression,
> while the other two require both compression and decompression.  So that
> one could be advertised even without libtxc_dxtn.
> Of course, now that we've decided to simply lie and fall back to
> GL_COMPRESSED_RGB[A] when the user asks for online compression and we
> don't have libtxc_dxtn, this isn't a problem.  So we can simplify.

I can see how one wants to lie about EXT_texture_compression_s3tc and
give users a broken GL by default, since that's what they want. AFAIK
previously it was a driconf option, but enabling it was too much of a
burden on the user.
Still there might be some users that want standard-compliant behaviour
without having libtxc_dxtn installed. Why not give them a driconf option
they can use to disable EXT_texture_compression_s3tc when libtxc_dxtn is
not there?


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