Wayland and GLES1 (Re: R200 DRM/KMS)

[Alex Deucher]

On Thu, Jul 9, 2015 at 2:58 AM, Steven Newbury <steve at snewbury.org.uk> wrote:
>
>
> On Thu Jul 9 03:32:40 2015 GMT+0100, Michel Dänzer wrote:
>> On 09.07.2015 06:01, Steven Newbury wrote:
>> > On Wed, 2015-07-08 at 21:56 +0100, Steven Newbury wrote:
>> >> On Tue, 2015-07-07 at 09:18 +0300, Pekka Paalanen wrote:
>> >>> On Mon, 06 Jul 2015 22:50:30 +0100 Steven Newbury
>> >>> <steve at snewbury.org.uk> wrote:
>> >>>
>> >>>> Would gles1 be sufficient to run a Wayland compositor, I'm
>> >>>> guessing probably not..?
>> >>>
>> >>> If you can find a Wayland compositor that is written to composite
>> >>>  with GLES1, that's all you need from the "Wayland side". (Yeah,
>> >>> this has nothing to do with Wayland per se.) Compositing in
>> >>> itself without any effects is very simple, as long as you get the
>> >>> textures up.
>> >>>
>> >>> Or, if you find a Wayland compositor written to use desktop
>> >>> OpenGL for compositing and does not use features your GL driver
>> >>> does not expose, that's good too.
>> >>>
>> >> Is desktop OpenGL accessible from "EGL_PLATFORM=drm"?
>> >>
>> > To answer my own question, it seems that is possible.  I wonder if
>> > it works with mutter/cogl???
>>
>> It does.
>>
>> However, your problem seems rather that gnome-shell/mutter doesn't
>> support R200 anymore.
> Yes, that's true. I wonder if I can revert the incompatible change or better create a env variable to revert to the compatible behaviour or something? I'll need to take a look...

I'm not sure how valid this is any more:
https://bugs.freedesktop.org/show_bug.cgi?id=51658

Basic issue is that r1xx/r2xx hw only has a limited number of render
buffer formats while they support a lot of texture formats.  Gnome
shell expects to be able to render to the same formats they can
texture from.

Alex

>
> [I'm going to be posting a lot from my phone, my laptop power jack has just broken, again! :-( You'd think after 3.5 decades of making laptops we'd have come up with a better design!]
> --
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