[Bug 768160] qtplugins: How to implement qmlglsrc.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768160

--- Comment #12 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #11)
> Are the GL contexts actually shared correctly?
> 
> Check with GST_DEBUG=glcontext:5 and look for other_context.

I think qtwarpglconext and glimagesink glcontext actually shared correctly, see
below log. Otherwise, scene graph cannot copy texture into another texture
create by glimagesink glcontext.

glcontext gstglcontext.c:938:gst_gl_context_create:<glcontextglx0> 
other_context:<glwrappedcontext0>
glcontext gstglcontext.c:843:gst_gl_context_set_window:<glcontextglx0>
window:<glwindowx11-0>
glcontext gstglcontext.c:1096:gst_gl_context_create_thread:<glcontextglx0>
Creating thread
glcontext gstglcontext_glx.c:333:gst_gl_context_glx_choose_format: GLX Version:
1.4
glcontext gstglcontext_glx.c:124:_describe_fbconfig: ID: 124
glcontext gstglcontext_glx.c:126:_describe_fbconfig: double buffering: 1
glcontext gstglcontext_glx.c:128:_describe_fbconfig: red: 8
glcontext gstglcontext_glx.c:130:_describe_fbconfig: green: 8
glcontext gstglcontext_glx.c:132:_describe_fbconfig: blue: 8
glcontext gstglcontext_glx.c:134:_describe_fbconfig: alpha: 0
glcontext gstglcontext_glx.c:136:_describe_fbconfig: depth: 24
glcontext gstglcontext_glx.c:138:_describe_fbconfig: stencil: 8
glcontext gstglcontext.c:1153:gst_gl_context_create_thread:<glcontextglx0>
Attempting to create opengl context. user chosen api(s) (any), compiled api
support (opengl opengl3 gles2) display api (opengl)
glcontext gstglcontext_glx.c:270:gst_gl_context_glx_create_context: gl context
id: 140582936698176

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