Commit c95dd966 authored by Stuart Young's avatar Stuart Young Committed by Eric Engestrom

docs: Update FAQ with respect to s3tc support

It's just over 10 months since 17.3.0 was released with s3tc support enabled.
Probably a good idea to update the FAQ page.

v2: Incorporate feedback from Adam Jackson <ajax@redhat.com>
Reviewed-by: Adam Jackson's avatarAdam Jackson <ajax@redhat.com>
Reviewed-by: Eric Engestrom's avatarEric Engestrom <eric.engestrom@intel.com>
Fixes: 04396a13 ("mesa: Import libtxc_dxtn sources")
Reviewed-by: default avatarEmil Velikov <emil.velikov@collabora.com>
parent f580a895
......@@ -16,7 +16,7 @@
<center>
<h1>Mesa Frequently Asked Questions</h1>
Last updated: 9 October 2012
Last updated: 19 September 2018
</center>
<br>
......@@ -373,18 +373,16 @@ the archives) is a good way to get information.
<h2>4.3 Why isn't GL_EXT_texture_compression_s3tc implemented in Mesa?</h2>
<p>
The <a href="http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_compression_s3tc.txt">specification for the extension</a>
indicates that there are intellectual property (IP) and/or patent issues
to be dealt with.
Oh but it is! Prior to 2nd October 2017, the Mesa project did not include s3tc
support due to intellectual property (IP) and/or patent issues around the s3tc
algorithm.
</p>
<p>We've been unsuccessful in getting a response from S3 (or whoever owns
the IP nowadays) to indicate whether or not an open source project can
implement the extension (specifically the compression/decompression
algorithms).
<p>
As of Mesa 17.3.0, Mesa now officially supports s3tc, as the patent has expired.
</p>
<p>
In the mean time, a 3rd party <a href="https://dri.freedesktop.org/wiki/S3TC">
plug-in library</a> is available.
In versions prior to this, a 3rd party <a href="https://dri.freedesktop.org/wiki/S3TC">
plug-in library</a> was required.
</p>
</div>
......
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