[gst-devel] glupload, glimagesink openGL question

[Julien Isorce]

Hi Miquel,

Take a look at gst-plugins-gl/tests/examples/sdl/sdlshare.c example.

(note that I have currently only tested it on win32, but I did the stuffs
for GLX, so it should work on linux too)

I think your use case is a little bit more complex because you was talking
about threads,
maybe because of sdl main loop and glib main loop.
So if you succeed then I would like to put your example in gst gl git.

Regards
Julien

2009/8/26 Julien Isorce <julien.isorce at gmail.com>

> Hello Miquel,
>
> First, the fact to be able to use the texture from gstgl and use them into
> your own opengl scene (through your favorite GL framework: clutter, SDL, Qt
> etc..) is possible (see cluttershare example), interesting and a need for a
> lot of people.
>
> Actually, I was waitting for someone that uses SDL. I would like to have an
> example like (cluttershare.c example that uses the framework clutter) but I
> want one example with SDL.
> So this is you [?]
>
> We will try to make it works
>
> 2009/8/26 Miquel Àngel Farré <miquel.farre at gmail.com>
>
>> Julien,
>>
>> I am managing my openGL scene under linux, using SDL.
>>
>> I have tryed xoverlay: glimagesink sending video to my openGL context
>> through his windowID.
>>
>> I was able to see the video on my openGL context screen, the problem is
>> flickering, in my application I am doing something like:
>>
> Flickering is often due to background redraw.
> You have to desactivate it trough SDL API.
>
>>
>>
>> while(true)
>> {
>>
>>   glClear();
>>   for (all textures)
>>   {
>>     draw();
>>   }
>>   glSwapBuffers();
>>  }
>>
>>  Another (secundary) problem is that sometimes I need the video in a
>> little quad instead of fullscreen..
>>
>
> In this case you have to do the same thing as cluttershare example, but
> using SDL.
>
>
>>
>> What do you think is the best way to implement it?
>>
>>
>> Thanks,
>>
>>
>> Miquel
>>
>>
>> 2009/8/26 Julien Isorce <julien.isorce at gmail.com>
>>
>>>
>>>
>>> 2009/8/26 Miquel Àngel Farré <miquel.farre at gmail.com>
>>>
>>>> Bug is submitted!
>>>>
>>>> Putting the bug apart, if I do something like mpegtsdemux ! queue !
>>>> glupload ! appsink, what I have at the output are opengl textures right? So
>>>> I can draw it directly into a quad ?
>>>
>>>
>>> This is not exact.
>>>
>>> If you are making an OpenGL scene, and you want to put gstgl textures
>>> into this scene.
>>> (then it means that you are managing your opengl context and your are
>>> also familiar with OpenGL API)
>>> Then gst-plugins-gl/tests/examples/clutter/cluttershare.c is the example
>>> you need.
>>> (But it's not so easy. you have to share your OpenGL context with the one
>>> inside gl elements)
>>>
>>> If you are not familiar with opengl and you just want to display the
>>> video on a quad, then you should consider to look into
>>> gst-plugins-gl/tests/examples/generic/cube and
>>> gst-plugins-gl/tests/examples/qt/qglwidgetxoverlay
>>>
>>>
>>>>
>>>> The bigger reason of use glupload is avoid the raw-yuv to rgb
>>>> conversion..
>>>
>>>
>>> So if your are not managing your own opengl scene, then just look into
>>> gst-plugins-gl/tests/examples/gtk/gtkxoverlay
>>> This example shows how to use the xoverlay interface.
>>>
>>>
>>> Just a question in case your are familiar with OpenGL and if you are
>>> already managing your own OpenGL scene,  which framework are you using ? on
>>> which OS ?
>>>
>>> Regards
>>> Julien
>>>
>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>>
>>>> Miquel
>>>>
>>>> 2009/8/26 Julien Isorce <julien.isorce at gmail.com>
>>>>
>>>>>
>>>>>
>>>>> 2009/8/26 Florent <fthiery at gmail.com>
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> >  * 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
>>>>>>
>>>>>>
>>>>>
>>>>>>  Doesen't work:
>>>>>>
>>>>>>    gst-launch -v -m filesrc location=../dumps/itv.ts !  mpegtsdemux
>>>>>> program-number="8442" ! queue ! mpeg2dec ! glupload ! glimagesink
>>>>>>
>>>>>>    gst-launch -v -m filesrc location=../dumps/itv.ts !  mpegtsdemux
>>>>>> program-number="8442" ! queue ! mpeg2dec ! glupload ! gldownload !
>>>>>> glimagesink
>>>>>>
>>>>>>  * Question: what glupload ! glimagesink do?
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>>
>>>>>>  Miquel
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> Both should work,
>>>>> Please file a bug and attach the console log of:
>>>>>
>>>>> GST_DEBUG=gldisplay:3 gst-launch -v -m filesrc location=../dumps/itv.ts
>>>>> !  mpegtsdemux program-number="8442" ! queue ! mpeg2dec ! glupload !
>>>>> glimagesink
>>>>>
>>>>> and:
>>>>>
>>>>> GST_DEBUG=gldisplay:3 videotestsrc ! "video/x-raw-yuv,
>>>>> format=(fourcc)I420" ! glupload ! glimagesink
>>>>>
>>>>> Julien
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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