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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #14 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 369213
  --> https://bugzilla.gnome.org/attachment.cgi?id=369213&action=edit
WIP gldownload: Implement direct dmabuf uploader

The idea is that some GPUs (like the Vivante series) can actually
perform the YUV->RGB conversion internally, so no custom conversion
shaders are needed. To make use of this feature, we need an additional
uploader that can import DMABUF FDs and also directly pass the pixel
format, relying on the GPU to do the conversion.

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