[Bug 756245] glshader: Add GRAY8 support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756245

--- Comment #2 from Hamdi Rakkez <hamdi.rakez.selotec at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #1)
> Do you want to provide a patch?

I've tried to make glshader support GRAY8 but I couldn't.
I hope to get get some clarification about where to start to do this.

>From where do this element get the information about it's capabilities (RGBA) ?

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