Re: Bug found via FXGLViewer::pick()

On 2023-02-10 16:05, David Vereb wrote:
> Hello everyone,
> 
> I've encountered a bug after updating my Ubuntu 22.04 installation. 
> Our code works on Ubuntu kernel 5.15.0-56-generic, but not on
> 5.15.0-58-generic or 5.15.0-60-generic.  I understand that this is
> likely not a bug in Fox Toolkit, but I don't know how to further
> investigate and was hoping someone here could provide assistance (or
> at least lead me in the right direction).
> 
> Please see https://github.com/dvereb/fox-pick-bug for a minimum viable
> example.  I've included a backtrace where my program segfaults in the
> README, and it's simple enough to install & run via make && ./a.out. 
> Note that I'm on fox-1.6.57-1build1 in the Ubuntu repository.
> 
> If there's anything else you need me to look up & respond back with,
> please let me know.  I've tried this on multiple machines with the
> same hardware: Intel(R) Core(TM) i3-10100 CPU with onboard graphics.

I have older i5-8500 processor running integrated GPU and am seeing
FXGLViewer's pick() not working.

With NVIDIA GTX3060 the pick() works fine. [This is with latest FOX
version, incidentally)].

So it appears to be OpenGL driver issue. Not sure what it would take
to fix it, maybe dive into the Mesa graphics code and see where it
goes off the rails.

I am not getting a core dump, btw. Just pick not working.


   -- JVZ


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