[Bug 732664] add other-context support to GstGLMixer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732664
  GStreamer | gst-plugins-bad | 1.3.90

--- Comment #3 from comicfans44 <comicfans44 at gmail.com> 2014-07-04 00:29:32 UTC ---
(In reply to comment #1)
> Hmm, this should be negotiated, using property for that is most likely a relic
> from before GstContext.

I have a little question about GstGLContext, seems that upstream gl element
getting GstGLContext from downstream gl element , but in context share
scenario,
GstGLMixer may be the last element of GL pipeline (consider  videotestsrc !
glvideomixer ! fakesink  ,then getting texture from fakesink to custom share
context OpenGL app , like qglwtextureshare demo) , and GstGLMixer can not use
context share since there's no downstream gl element. 

if this is expected behaviour , I must use a GstGLFiter after GstGLMixer to
giving GstGLMixer a proper shared context, this makes GstGLMixer/Filter
different

please corrent me if there's some misunderstood

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