[Bug 792407] Windows: GL context sharing fails in async loading mode.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792407

--- Comment #4 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Petros from comment #3)
> In any case, I would like to provide proper fallback support when
> wglCreateContextAttribsARB() fails so my question would be at which point
> exactly should one disable and then (re)enable the application context ( in
> this case the one coming from Cinder ) on a playbin - appsink based pipeline
> so that wglShareLists() doesn't fail when GStreamer tries to setup/share the
> context internally ?

Step 1 is to figure out why wglCreateContextAttribsARB fails exactly. This
situation might be avoidable for the NVIDIA drivers.  Failing that, a bug with
NVIDIA with might be prudent to get this fixed at the source.

As for a workaround, the only real way to know when the GL context has been
created is by overriding the 'create-context' signal on GstGLDisplay and
creating the GL context there with the cinder GL context not current.

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