[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 #8 from Sebastian Dröge (slomo) <slomo at circular-chaos.org> 2013-08-29 14:32:11 UTC ---
(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?

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