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

[Marek Olšák]

On Tue, Apr 23, 2019 at 6:30 PM Eric Anholt <eric at anholt.net> wrote:

> 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.
>

Then I think a separate EGL extension that exposes swrast would be better.
The thing with the device extensions is that swrast is not a device.

Marek
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