Move wayland-drm protocol from Mesa to wayland-core

[Jasper St. Pierre]

Wasn't EGLStreams supposed to solve the use case of passing hardware
buffers around in a standard way?


On Wed, Nov 27, 2013 at 1:22 PM, Jason Ekstrand <jason at jlekstrand.net>wrote:

>
> On Nov 27, 2013 10:53 AM, "Benjamin Gaignard" <
> benjamin.gaignard at linaro.org> wrote:
> >
> > Hi all,
> >
> > I'm working for Linaro on enabling a zero copy path in GStreamer by
> > using dmabuf.
> > To make this possible I have patched gst wayland sink to use wayland
> > drm protocol: https://bugzilla.gnome.org/show_bug.cgi?id=711155
> >
> > Today wayland drm protocol is limited to Mesa so I have decided to
> > move it into wayland-core.
> > My hardware doesn't have gpu support yet so I have patched weston
> > (pixman) to allow usage of wl_drm buffers.
> > With this I able to share/use a buffer allocated by DRM in gstreamer
> > pipeline even if I don't have gpu and EGL.
> >
> > What do you think about make wayland drm protocol available like this ?
>
> Benjamin,
>
> The problem here is that wl_drm is really a mesa extension.  Well, more of
> an open-source linux graphics stack extension.  The point is that there are
> other graphics stacks: Rhaspberry Pi, libhybris, other proprietary stacks,
> etc.  and each of these graphics stacks has its own extension for passing
> hardware buffers around.  This means that if you want your GStreamer sink
> to work on these other stacks with zero-copy, you will have to talk their
> protocols.  Because wl_drm isn't global to all of wayland, it probably
> shouldn't go into the wayland core.
>
> This does not mean, however, that wl_drm can't be exposed in a more
> sensible way.  As of 1.3, we are now exporting wayland.xml to
> /usr/share/wayland and we can put other extensions there as well.  We could
> have, for instance, a /usr/share/mesa.xml file that provides the mesa
> extensions.  Then projects wanting to talk directly to mesa can generate
> the header and C files from the system-installed xml file.  This would
> solve the problem of keeping everything in sync.
>
> One last note (this one's been bugging me for a while).  If we are going
> to export wl_drm in some way, we should probably rename it to something
> like mesa_drm.  We really need to get out of the habit of using the wl_
> namespace for everything that talks the wayland protocol.  If we don't
> alter the details of wl_drm in the rename, it shouldn't be too hard to move
> everyone over from wl_drm to mesa_drm.
>
> Hope that's sensible/helpful.
> --Jason Ekstrand
>
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>


-- 
  Jasper
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