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

[GStreamer (GNOME Bugzilla)]

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

Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> changed:

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--- Comment #45 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 373598
  --> https://bugzilla.gnome.org/attachment.cgi?id=373598&action=edit
glupload: 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.

Based on patches from Nicolas Dufresne <nicolas.dufresne at collabora.com> and
Carlos Rafael Giani <dv at pseudoterminal.org>.

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