[Bug 759860] New: text overlays are always rendered by glimagesink and ignore gl transformations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759860

            Bug ID: 759860
           Summary: text overlays are always rendered by glimagesink and
                    ignore gl transformations
    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: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The expected result is to see the timeoverlay on every cube face instead of the
top left sink corner:

gst-launch-1.0 videotestsrc ! glupload ! timeoverlay ! glcolorconvert !
glfiltercube ! glimagesink

The expected result can be obained by moving timeoverly before glupload (but in
that case, 
gst-launch-1.0 videotestsrc ! timeoverlay ! glupload ! glcolorconvert !
glfiltercube ! glimagesink

Also, since actual timeoverlay rendering is left to the sink, why is the
following failing to link (resulting in requiring a glcolorconvert element) ?
gst-launch-1.0 videotestsrc ! glupload ! timeoverlay ! glfiltercube !
glimagesink
WARNING: erroneous pipeline: could not link timeoverlay0 to glfiltercube0

These issues are shared by textoverlay and timeoverlay.

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