[Bug 782774] kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782774

--- Comment #23 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355108
  --> https://bugzilla.gnome.org/attachment.cgi?id=355108&action=edit
kmssink: Track cached kmsmem and clear them on drain

In this patch we keep track of the cached kmsmem in a way
that we can clear the cache during the drain process. This
release the framebuffer before waiting for the next vblank,
hence add support for DRM driver (like Intel one) that release
the associated DMABuf reference asynchronously.

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