[Bug 719757] New: [glimagesink] configure script should allow to build X11/glx backend

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719757
  GStreamer | gst-plugins-gl | git

           Summary: [glimagesink] configure script should allow to build
                    X11/glx backend
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-gl
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=263383)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263383
 Review: https://bugzilla.gnome.org/review?bug=719757&attachment=263383

osx: allow x11/glx backend and set default runtime to cocoa/nsgl

Currently if you install x11 and mesa-glx (for example through MacPorts), the
configure script detects that glx is available but not x11.
So it try to build the support but it fails at linking time (with all default
value to the flags): undefined reference to "gst_gl_context_glx_new"

So the following patch add missing part that detects x11 and gl libs. It also
set the cocoa backend as the default when running gst-launch videotestsrc !
glimagesink.
Which is equivalent to:
GST_GL_WINDOW=cocoa GST_GL_PLATFORM=cocoa gst-launch videotestsrc ! glimagesink

Note that for the platform case, maybe cocoa should be renamed to nsgl.

To use x11/glx:
GST_GL_WINDOW=x11 GST_GL_PLATFORM=glx gst-launch videotestsrc ! glimagesink

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