Re: [Discuss-gnuradio] GL sinks freeze

[Josh Blum]

Nick Foster wrote:
> Hi all,
>
> I'm having some trouble with the OpenGL versions of the wxgui waterfall and FFT 
> sinks. I'm using r11659 (8/30/09). To test the sinks, I just created a simple 
> flowgraph with a 32ksps random stream (throttled) feeding the sinks, similar to 
> what the built-in test methods for the sinks use.

All the newest stuff is on git: http://gnuradio.org/cgit
For some reason we wont clear the svn stuff, probably to confuse people...

> The FFT sink freezes up after displaying a single frame in GL mode, and never 
> updates. It then locks up, using 100% CPU. The waterfall sink doesn't even 
> load; it just loads an empty gray box and then freezes. However, it doesn't use 
> any CPU time. Both sinks work fine in non-GL mode. Interestingly, the GL 
> versions of the scope sink and histogram sink seem to work fine, so I don't 
> believe it to be an issue with my graphics driver (nvidia kernel driver on 
> Ubuntu Hardy).

The waterfall sink is making heavy use of textures and I could imagine 
that having problems but... the scope and the fft are exercising the 
exact same gl plotter base class. So I cannot fathom why the fft freezes 
for you and the scope works.

The only thing that comes to mind is the update rate on the fft is 
probably larger than the scopes. Not that the rate should be enough to 
kill your cpu, but if the gl configuration has issues, that could 
explain it.

You may try turning your ubuntu visual effects to off. They have been 
known to mess up other applications that try to use gl.

> Are there any known issues with the GL waterfall or FFT sinks? Has anyone else 
> encountered this issue? I'd like to use the extra functionality the GL 
> waterfall sink offers.
>
> Thanks,
> Nick
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