[Bug 711155] wayland: add wl_drm support to wayland sink

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=711155

--- Comment #33 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Exception that the dmabuf allocator does not allocate, hence cannot be put in
the allocator array. If it get used accidentally by an element that does not
know how it works, it will completely fail the pipeline. Passing a dmabuf
allocator in there seemed like a good idea even to me at first, but is in fact
a bad idea as it makes everything more complex when come time to deal with the
allocator array in generic code.

That being said, the format list *DO* vary. It's very common with MALI, where
the EGL path uses shaders internally, hence can support more formats then your
HW mixer do (which arguably makes everything more complex). The same DMABUF on
these target could be imported in GL space, but not directly renderer to the
display.

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