[Bug 776927] gl: gldownload: convert GstGLMemory to GstDmaBuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776927

--- Comment #58 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
For those interested, I'm currently testing on gnome-shell 3.26, on Intel
driver with:

  GST_GL_PLATFORM=egl GST_DEBUG="waylandsink:5"  gst-launch-1.0 -v v4l2src !
glupload ! glcolorconvert ! gldownload ! waylandsink

Which will get dmabuf to glupload in YUY2, shader convert to BGRx, transform to
DMABuf (linearization) and pass the to gnome-shell. A fun fact, this uses X11
EGL context to pass buffer to wayland ;-P

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