[Bug 726494] New: use wglCreateContextAttribsARB to create share context

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726494
  GStreamer | gst-plugins-gl | git

           Summary: use wglCreateContextAttribsARB to create share context
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-gl
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: comicfans44 at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=272121)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=272121)
misc patch to improve windows share context create

currently gst-plugins-gl use wglShareLists to create share context ,as I tested
(win7 32bit + AMD GPU), it can not share context correctly (qglwtextureshare)
,and  GstGLContextWGL code path did not support wrapped context. so I created
this misc patch to improve this.

I use wglCreateContextAttribsARB to create context, as this link mentioned
(https://www.opengl.org/wiki/Platform_specifics:_Windows#wglShareLists)

I haven't other os (such as XP ) nor GPU to test , it may break in some
condition.
hopes others help testing and improving this.

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