bug#44558: Mesa isn't update to date

[Marius Bakke <marius@gnu.org>]

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Guillaume Le Vaillant <glv@posteo.net> writes:

> Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@gnu.org> skribis:
>
>> Romulasry, are you suffering from specific Mesa 20.0.7 problems that 20.2.2
>> might fix?  Please let us know.  An otherwise working package not being at the
>> latest upstream version isn't a bug.
>>
>> romulasry via Bug reports for GNU Guix 写道：
>>> Mesa 20.2.2 is released
>>
>> The core-updates branch updates Mesa to 20.1.9.  Would you like to submit
>> a (tested) core-updates patch updating it to 20.2.2?
>
> Hi,
>
> Mesa 20.2 brings direct OpenGL rendering support for Nvidia RTX 20xx
> graphic cards with the nouveau driver, whereas with our current version
> these cards have to use LLVMpipe.
> I tested the update quickly on my local staging branch using glxgears
> and vlc, and it worked fine. When reading a video the CPU usage dropped
> from 30% to 2%, which is nice.

That is great news.

The current 'staging' branch is just about ready for merge[*], so a Mesa
update will have to wait until the next round.

However, I think libGL is fairly ABI-stable, so you may be able to
"graft" this version in the mean time, like in commit
fdd883509301845ddb4dc90e70e58b469afb5441.

[*] gst-plugins-good fails on armhf and i686, not sure what to do about
it yet: https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/803

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