[Bug 751684] Defaults to glimagesink even when GL is software rendered

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751684

Matthew Waters <ystreet00 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ystreet00 at gmail.com

--- Comment #10 from Matthew Waters <ystreet00 at gmail.com> ---
(In reply to Julien Isorce from comment #8)
> You do not need a GstGLContext to call
> gst_gl_context_default_get_proc_address(GST_GL_API_GLES2, "glGetString").

default_get_proc_address only looks within the GL shared library and doesn't
perform {glX,egl,wgl,etc}GetProcAddress.  As a result there are cases where the
default get_proc_address will fail to retrieve valid functions.

> We could call that in gst-plugins-bad/ext/gl/gstopengl.c::plugin_init and
> downgrade the rank only if GL_RENDERER string contains "softpipe".

We need a GL context current to be able to even think of calling the returned
function pointer which is another complication.

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