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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #70 from Michael Olbrich <m.olbrich at pengutronix.de> ---
I noticed, that _direct_dma_buf_upload_transform_caps() is not quite correct.
It should provide empty caps if the downstream format is anything other than
RGBA.

I'm not sure if that makes a difference in practice.

In general, I think that glupload should always prefer RGBA on the sink pad.
That
way we can potentially avoid extra conversions. My patch would be a first step
in
that direction.
However, I'm not sure it it's worth the effort. Are there any real use-cases
where
the input format is not fixed anyways?

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