[Bug 783521] gl: Add "direct" dmabuf uploader

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783521

--- Comment #3 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Created attachment 353352
  --> https://bugzilla.gnome.org/attachment.cgi?id=353352&action=edit
0003 add direct dmabuf uploader

The actual direct dmabuf uploader code. Note the remaining issues in the commit
message of the patch. Here it is:

- It is currently unknown how to determine if the GPU can handle these
  conversions
- Currently it is not possible to probe for what EGLImage DMABUF input
  formats the GPU can handle
- The EGLImage cache is there, but cannot be used, because some drivers
  like etnaviv keep a cached copy of the texture inside, and it is
  currently not clear how to let etnaviv know that the cache has to be
  flushed once the associated DMABUF gets a new video frame

Interestingly, disabling the cache does not seem to impact performance much on
the i.MX6 (CPU usage is <10% when using a v4l2videodec capture-io-mode=dmabuf !
glimagesink pipeline even with 1080p content), even though in kmscube, the
EGLImage is similarly constantly created and destroyed, and there, we see large
CPU% figures..

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