[gst-devel] glupload, glimagesink openGL question

[Tristan Matthews]

Hi,

Florent wrote:
>> I would like to obtain video from a stream and send it to my openGL based
>> application, and draw the frames there.
>>     
Would your application be in the same process as your gstreamer 
pipeline? If not, you won't be able to share gl contexts if you're using 
direct rendering. From 
http://www.opengl.org/sdk/docs/man/xhtml/glXCreateNewContext.xml:

            .... direct-rendering contexts cannot be shared outside a 
single process,
            and they may be unable to render to GLX pixmaps.

If you don't want it in the same process, you could use appsink, pass 
the buffers to some shared memory and in your GL process upload these 
buffers to GL textures.

Sorry if this is an aside, I've been working on something similar so I 
thought I would pass the information along.

Best,

Tristan
       
>> My idea is use glupload to obtain openGL textures and then load these into
>> the application through appsink.
>>     
>
> You won't need any gl-based stuff if you use appsink, because it will
> pass raw buffers in memory.
>
>   
>> * Question: there is a better way to pass the textures to my app instead of
>> appsink ?
>>     
>
> You can, however share the openGL context between glimagesink and your
> application so that you don't need to upload frames manually. See
> tests/examples/clutter/cluttershare as example.
>
>   
>>  * Question: what glupload ! glimagesink do?
>>     
>
> glimagesink uses glupload internally, so you don't need it for using
> glimagesink. You need glupload only if you want to filter the frames
> using opengl (ex: glupload ! gleffects effect=2 ! glimagesink)
>
> Florent
>
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-- 
Tristan Matthews
Société des arts technologiques [SAT]
email: tristan at sat.qc.ca
web: http://www.music.mcgill.ca/~tmatthews