[Bug 784210] gl: [regression] GstGLUploadMeta feature doesn't show frame in GLX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784210

--- Comment #5 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Hyunjun Ko from comment #4)
> (In reply to Matthew Waters (ystreet00) from comment #3)
> > Actually, this may be a gstgl bug.  The default for glDrawBuffer is GL_BACK
> > or GL_COLOR_ATTACHMENT0 depending on if a framebuffer is current or not. 
> > Does changing the enum to glDrawBuffer fix this?
> 
> Yes, it fixes it by chaning either GL_BACK or GL_COLOR_ATTACHMENT0 :)

Ok, then that is the correct approach for that. Do you want to provide a patch?

I think there are a few other cases where this happens that you may as well fix
too.

The draw buffer should reset to GL_BACK if there is no framebuffer bound and
GL_COLOR_ATTACHMENT0 if there is a framebuffer bound.

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