[Bug 704806] Implement GL context sharing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704806
  GStreamer | gst-plugins-gl | git

--- Comment #9 from Matthew Waters <ystreet00 at gmail.com> 2013-08-29 14:34:14 UTC ---
(In reply to comment #8)
> (In reply to comment #5)
> 
> > > Also, does this really already fix the case where we have two contexts. One
> > > producing a texture, one wanting to render it?
> > 
> > With WGL, GLX and EGL, yes.  I can't test this on a real Cocoa environment and
> > GNUstep apparently doesn't like shared contexts :(.  Also, that's exactly what
> > the test case does and what I used to test this.  One thread draws to the fbo
> > (with a texture as an attachment) as fast it can, the other renders the texture
> > to the window).  Try it :).
> 
> But this requires the second context to be initialized from the first one,
> right? If both contexts are created independently (but happen to share the same
> display?) this won't work?

Correct

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