[Bug 733245] New: gl: Document GST_GL_PLATFORM, GST_GL_API and GST_GL_WINDOW somewhere

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733245
  GStreamer | gst-plugins-bad | 1.3.91

           Summary: gl: Document GST_GL_PLATFORM, GST_GL_API and
                    GST_GL_WINDOW somewhere
    Classification: Platform
           Product: GStreamer
           Version: 1.3.91
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: leio at gentoo.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently it doesn't seem the environment flags GST_GL_PLATFORM, GST_GL_API and
GST_GL_WINDOW are documented anywhere - e.g under "Running GStreamer" or even
just glimagesink documentation as the primary library consumer right now.

They should be documented somewhere as knobs to turn to get stuff going when
multiple platforms, apis or windowing systems are enabled, as automatic correct
picking doesn't seem to really work out in practice (yet?)

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