[Bug 767635] New: gleffects: fix little rectangel appears at the center when use squeeze and tunnel effects

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767635

            Bug ID: 767635
           Summary: gleffects: fix little rectangel appears at the center
                    when use squeeze and tunnel effects
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jared.hu at nxp.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Should use highp precision, these two shader will calculate the verctor length
and use it as denominator. But length could be zero which will cause undefine
behaviour.

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