[osg-users] "Error: Not able to create requested visual." for osg application utilizing multi-sampling, ran with optirun.

[Hamza Alloush]

----------------------------------------
> From: hamzaalloush at live.com
> To: osg-users at lists.openscenegraph.org
> Date: Fri, 21 Aug 2015 07:09:55 +0000
> Subject: Re: [osg-users] "Error: Not able to create requested visual." for osg application utilizing multi-sampling, ran with optirun.
>
>
>
> ----------------------------------------
>> From: scrawl at baseoftrash.de
>> Date: Fri, 21 Aug 2015 00:53:46 +0200
>> To: osg-users at lists.openscenegraph.org
>> Subject: Re: [osg-users] "Error: Not able to create requested visual." for osg application utilizing multi-sampling, ran with optirun.
>>
>> This might be simply a driver limitation. Not all hardware and drivers support multisampling. For example, I'm using OSG on Mesa + Intel HD Graphics which doesn't support multisampling at all.
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>
> hi,
>
> i have multi sampling working without optirun, here is my setup:
>
> -Acer Aspire laptop
> -Ubuntu 14.04
> -Intel 3000 HD Graphics
> -Nvidia GT 540 ( 346.82 )
>
> It just doesn't work for some reason if i use optirun defaults(through a virtualgl rendering bridge) to run an osg app with multisample, with a "Error: Not able to create requested visual".
>
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here's some more relevant info:

Ubuntu 14.04

libgl1-mesa-dri=10.1.3-0ubuntu0.4 (provides i915 Intel driver)
libgl1-mesa-glx=10.1.3-0ubuntu0.4 (provides /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1.2.0)
libgl1-mesa-dev=10.1.3-0ubuntu0.4 (provides symlink to the above in /usr/lib/x86_64-linux-gnu/libGL.so)
nvidia-346=346.82-0ubuntu0.2 (provides Nvidia driver)
bumblebee=3.2.1-93 (provides optirun and /etc/bumblebee/bumblebee.conf)

this is just for reference, but if someone would let me know what exactly multi sampling does to instancing a GraphicsContext that it Sigfaults when used with "virtualgl", i would appreciate it.

p.s: compile example with: "g++ multisample.cpp -losg -losgViewer -g -o multisampletest"

Thanks
Hamza