[Bug 764124] glmemory: avoid creating a framebuffer every download/copy

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764124

--- Comment #2 from comicfans44 <comicfans44 at gmail.com> ---
(In reply to Matthew Waters (ystreet00) from comment #1)
> Review of attachment 324655 [details] [review]:
> 
> There is more than one usage of framebuffers in gstglmemory that this
> doesn't consider.  There's also one in gstglmemorypbo that should also be
> cached.

Oh , I didn't realize that. I reached this code by view OpenGL call trace, but
my code only trigger one path of them.  should I put fbo as member of
GstGLBaseMemory ,or duplicate it in GstGLMemory and GstGLMemoryPBO ?

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