[Bug 747232] Port and optimize GstGL deinterlace filter

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747232

--- Comment #4 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Julien Isorce from comment #3)
> Hi Haihua, thx for porting it to GLES2
> (https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/
> ?id=0cfb0890ce9a20f096a0a9c9f23b656f436794c6). But it was still not
> efficient enough on embedded right ? That's why you wrote the other method ?
> 
> typedef enum
> {
>   GST_GL_DEINTERLACE_VFIR, -> this one
>   GST_GL_DEINTERLACE_GREEDYH
> } GstGLDeinterlaceMethod;

Yes, the performance of the original shader is not good and can only reach half
performance of the new shader on my imx6QP. The deinterlace effect is also not
good and little sawtooth still exists on the video frame.

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