[Mesa-dev] [PATCH 2/2] egl: add EGL_platform_device support

[Eric Anholt]

Marek Olšák <maraeo at gmail.com> writes:

> On Tue, Apr 23, 2019 at 4:39 PM Mathias Fröhlich <Mathias.Froehlich at gmx.net>
> wrote:
>
>> Hi,
>>
>> On Tuesday, 23 April 2019 22:23:45 CEST Marek Olšák wrote:
>> > On Tue, Apr 23, 2019 at 4:05 PM Mathias Fröhlich <
>> Mathias.Froehlich at gmx.net>
>> > wrote:
>> >
>> > > Hi Marek,
>> > >
>> > > On Tuesday, 23 April 2019 20:22:15 CEST Marek Olšák wrote:
>> > > > I'd like to remove swrast from devices. It doesn't work
>> (eglInitialize
>> > > > fails) and I don't think I like swrast there. Any objections?
>> > >
>> > > Yes, how do you guarantee that at least one device can be returned
>> > > in any case? Even if no drm device is found?
>> > > The egl device query extension guarantees that there is at least one
>> > > device available.
>> > > Beside that swrast may make sense for itself, that is the reason
>> > > the swrast device is there.
>> > >
>> >
>> > If no device can be returned, the extension won't be exposed.
>> Yes, I was triggering this solution back in the days. There was (is?) no
>> infrastructure to enable
>> or disable an egl extension just past initialization or at runtime.
>> Finally Emil took the route to add swrast.
>>
>> The longer I saw the swrast device the better It appeared to me.
>> ... from the users point of view.
>>
>> >    OR
>> > If there is at least 1 drm device, swrast won't be in the list.
>> >
>> > From my perspective, radeonsi is always in the list and I wouldn't like
>> > swrast to be in the list if radeonsi is in the list.
>>
>> I see - at least I think. But really the swrast device is good as is. I
>> see plenty use cases for that.
>> Having that only present when there is no hardware device makes it less
>> useful.
>>
>
> How is swrast good? How is swrast useful if you have a supported GPU?

EGL has the possibility of finally displacing OSMesa if we can expose
swrast devices.  People doing regression testing of higher-level
software stacks (xserver, servo, etc.) need a consistent rasterizer they
can use regardless of the hardware a developer might happen to have on
their desktop.
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