[gst-devel] Querying GL context pixel format

[Julien Isorce]

Hi

set GST_GL_WINDOW_DEBUG=1
before launching the pipeline, it should output some debug informations
about success or failure when sharing gl contexts.

I had no time to look into your example. I am still busy right now.

What I can say, if the debug is : failed to share gl context, make sure that
the Qt GL context is not current in any thread when sharing it with
gstreamer. (see cluttershare and sdlshare (from git) examples to see how to
do that)

Sincerely
Julien


2009/11/4 Andrey Nechypurenko <andreynech at yahoo.com>

> Hi Folks,
>
> I am currently working on Qt-based application which uses OpenGL context
> (texture) sharing technique to display video on 3D scene. I am using
> approach similar to the one implemented in cluttershare example from
> gst-plugins-gl. Currently it runs on Linux but does not work on Windows. I
> believe that the reason is that context sharing between Qt and Gstreamer
> does not work. According to the documentation, only contexts with the same
> pixel format could be shared. That is why I was looking for the way to query
> pixel format used with GL context created by gst-gl plugin and did not found
> it yet. I guess it just does not exists :-) .
>
> So the question I would like to ask is whether it would make sense to add
> some kind of API to make it easier to access GL context created? For
> example, it could be callback set via certain property which is called right
> after the initialization step and provide corresponding handles (HWND, HDC,
> HGLRC or any other platform-specific handles similar to those stored in
> _GstGLWindowPrivate structure) which could be used with platform and GL API
> to query required information?
>
> I would also appreciate any comments or pointers to the possible solution
> directions without extending the property set or API.
>
> Regards,
> Andrey.
>
>
>
>
>
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