[Bug 730927] gl: avoid using an extra FBO pass for formats that requires a shader at upload time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=730927

--- Comment #3 from Julien Isorce <julien.isorce at gmail.com> ---
There is still this extra pass on current master right ?
Framebuffer api has not changed since then:
http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/gst-libs/gst/gl/gstglframebuffer.h

Since glimagesink is now a bin, should glupload just draw directly to the
window if glcolorconvert is set as passthrough ?
glcolorconvert could also draw directly to the window back buffer in theory
when used in glimagesink bin. 

I am insisting on this because on embedded, requiring extra FBOs rapidly brings
gpu memory usage to a high percent of its maximum, on large resolutions.
I think even when using EGLImage we have currently extra passes.

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