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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #22 from Michael Olbrich <m.olbrich at pengutronix.de> ---
Created attachment 372959
  --> https://bugzilla.gnome.org/attachment.cgi?id=372959&action=edit
gl/egl: Add gst_egl_image_from_dmabuf_direct() function

The colorspace conversion happens during the upload so the necessary hints
must be provided to ensure that the conversion works correctly.

At least the Mesa Intel driver will create a texture without error but
produces an incorrect result. Use eglQueryDmaBufModifiersEXT() to check if
non-external upload is supported for the given format.

Based on a patch from Carlos Rafael Giani <dv at pseudoterminal.org>.

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