How to check if OpenGL is supported?

[Campbell Barton]

On Tue, Sep 10, 2013 at 4:45 PM, Pekka Paalanen <ppaalanen at gmail.com> wrote:
> On Tue, 10 Sep 2013 16:13:32 +1000
> Campbell Barton <ideasman42 at gmail.com> wrote:
>
>> On Tue, Sep 10, 2013 at 3:49 PM, Pekka Paalanen <ppaalanen at gmail.com>
>> wrote:
>> > On Tue, 10 Sep 2013 14:06:55 +1000
>> > Campbell Barton <ideasman42 at gmail.com> wrote:
>> >
>> >> Hi, I'm interested to get Blender (OpenGL 3d graphics application)
>> >> running with wayland/weston.
>> >>
>> >> However I cant tell if my configuration can even run simple OpenGL
>> >> applications (the more recent weston for arch-linux 1.2.2 has no
>> >> "weston-gears").
>> >>
>> >> Whats a good way to see if loading opengl/egl applications is
>> >> supported?
>> >>
>> >> Some more info in case it helps.
>> >> ----
>> >>
>> >> A while back I managed to run weston but no opengl applications
>> >> would work (weston-gears for example didn't start but weston-smoke
>> >> did, It gave some error about not being able to setup EGL).
>> >> I spent some time trying to get this running but I think it simply
>> >> wasn't supported by proprietary-nvidia & mesa configuration.
>> >>
>> >> More recently I tried again with a newer weston but now I cant find
>> >> weston-gears so not sure how to test.
>> >>
>> >> There is a git repo that Wander Costa has been working on, but its
>> >> crashing on my system (opengl context fails to initialize).
>> >> https://github.com/walac/blender-wayland
>> >>
>> >> So I want to know if this is a bug in the code or just a limitation
>> >> with my configuration.
>> >>
>> >
>> > Hi,
>> >
>> > if you are still on proprietary Nvidia GeForce drivers, then
>> > Wayland GL applications have no chances of working at all.
>> >
>> > The basic test for openGL support (well, GLES 2.0 really, but it
>> > doesn't matter which flavour of GL you test) is the
>> > (weston-)simple-egl program from the Weston repository.
>> >
>> >
>> > Thanks,
>> > pq
>>
>> Strange, weston-simple-egl works,
>>
>> It prints output about EGL, linked.
>> http://www.pasteall.org/45482
>>
>> But I'm not sure if this is using similar enough features to Blender
>> that the OpenGL context is comparable (Blender uses full OpenGL but
>> has an EGL option to support opening a window for wayland support).
>
> Your paste of the Weston log says it is using a software GL
> implementation of Mesa: llvmpipe. IOW, that is not using your GPU.
>
> I should have been more accurate: of course software GL implementations
> have a chance of working, and it's nice to see it actually does work at
> least that much. :-)
>
> But I assume software GL was not what you were looking for, right?
>
>
> Thanks,
> pq

Software OpenGL is fine if I can use it to get Blender window up and
running in weston.
I've used Blender with mesa's 'swrast' before on X11 and it runs fine
as long as GLSL isnt used,
so I know this works - but not sure if llvmpipe does. (it should, we
only require OpenGL 1.4x).

-- 
- Campbell