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

[GStreamer (GNOME Bugzilla)]

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

Matthew Waters (ystreet00) <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |NEEDINFO
                 CC|                            |ystreet00 at gmail.com

--- Comment #2 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
This may be a condition of the wglShareLists() function that you're hitting
that's explained in the comment at
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/qt/gstqtglutility.cc#n213

The crux is that on windows, you need to make sure that the GL context one is
sharing with is not current anywhere before attempting to share.  As such this
is really a limitation of the GL drivers on Windows not providing proper
wglCreateContextAttribsARB() support where this limitation does not apply.

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