How to avoid this Xvfb error: ES2 Prism: Error - GLX extension is not supported

[Roland Mainz]

On Mon, Dec 12, 2016 at 8:27 PM, Antoine Martin <antoine at nagafix.co.uk> wrote:
> On 12/12/16 19:51, Long Vu wrote:
>> On Mon, Dec 12, 2016 at 1:06 PM, Long Vu <long.vu at intelerad.com> wrote:
>>> On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson <ajax at nwnk.net> wrote:
>>>> On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
>>>>
>>>>> Would it be this xvfb-run option ?
>>>>>
>>>>> -s ARGS   --server-args=ARGS        arguments (other than server number and
>>>>>                                     "-nolisten tcp") to pass to the Xvfb server
>>>>>                                     (default: "-screen 0 640x480x8")
>>>>>
>>>>> I am not familiar with X server options, what server args I would need
>>>>> to get rid of this "ES2 Prism: Error - GLX extension is not supported"
>>>>> error?
>>>>
>>>> Yes, I think it would be:
>>>>
>>>> xvfb-run -s "-screen 0 640x480x24" # ... whatever else you use
>>>
>>> I tried xvfb-run -s "-screen 0 640x480x24", still the same error.  Any
>>> other clues?
>>>
>>> ES2 Prism: Error - GLX extension is not supported
>>>     GLX version 1.3 or higher is required
>>> Xlib:  extension "RANDR" missing on display ":99".
>>>
>>>
>>> Now that I run at 24 bpp, maybe I should force GLX to be enabled?  Or
>>> have to specify a GLX version, otherwise the default is less than 1.3?
>>>
>>
>> I bumped the resolution and manually try to enable GLX, still the same error.
>>
>> xvfb-run -s '-screen 0 1024x768x24 +extension GLX +iglx' <command>
>>
>> I don't know what else to try.
> Your Xvfb on CentOS will not support the GL extension.
> If you really must use OpenGL with your client applications:
> 1) Use Xdummy
> https://xpra.org/trac/wiki/Xdummy
> 2) Use VirtualGL
> http://www.virtualgl.org/

Correction:
The version of Xvfb he is using has been compiled without GLX support
and he "just" needs to recompile his own version with GLX support
enabled...

----

Bye,
Roland

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