[Bug 765795] glimagesink: support video frame rotation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765795

--- Comment #20 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #18)
> The current transformation is based on 0 to 1 not -1 to 1 as is normal with
> transformations so you have to modify the matrix for that.

By the way, why do we apply u_transformation to texture coordinate but not
vertex coordinate? What effects do you want to realize? Since rotation
transform on vertex coordinate is simpler than texture coordinate. Is it ok to
change to apply u_transformation to vertex?

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