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

[GStreamer (GNOME Bugzilla)]

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

Benjamin Gaignard <benjamin.gaignard at gmail.com> changed:

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 Attachment #310472|0                           |1
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--- Comment #47 from Benjamin Gaignard <benjamin.gaignard at gmail.com> ---
Created attachment 311346
  --> https://bugzilla.gnome.org/attachment.cgi?id=311346&action=edit
make waylandsink use zlinux_dmabuf upstreamed protocol

With this patch we have been able to do 0-copy with dmabuf between the sink and
weston.

We had to copy the protocol because weston doesn't exported it. It is only
experimental for intel driver, we need to send a patch to weston to fix that
then we can probably test weston version in configure to know if the protocol
file is available or not.

We have only consider allocation through DRM dumb buffer API so investigating
how add EGL allocation is needed.

As in the previous patch dmabuf allocator is added in pool configuration to let
elements negotiate the allocator.

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