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

[Eric Gunther]

On Mon, 2016-12-12 at 14:39 -0500, Long Vu wrote:
> On Mon, Dec 12, 2016 at 2:34 PM, Eric Gunther 
> wrote:
> > On Mon, 2016-12-12 at 13:51 -0500, Long Vu wrote:
> > 
> > I don't know if this will help, but previously adam had said:
> > 
> > > How are you launching Xvfb? I believe it defaults to 8bpp, but
> > > GLX
> > only
> > > works at 16 or 32bpp.
> > 
> > which I think you hadn't tried yet.
> > 
> 
> Well I did with
> 
> xvfb-run -s '-screen 0 1024x768x24 +extension GLX +iglx' 
> 
> I though the adding x24 to the screen is what Adam meant.
> 
> If I miss understood, kindy point out to me because I am not familiar
> with X server options.
> 
> Thanks.
> 
> 
> -- 
> Long Vu | Build Controller | Intelerad | +1-514-931-6222 ext. 7743
> 

Again, don't know, but it would seem as though the 24 is the depth.

As you have referred to bpp before, I assume that is what you mean.
https://en.wikipedia.org/wiki/Color_depth

According to the man page for xvfb 
https://www.x.org/archive/current/doc/man/man1/Xvfb.1.xhtml

"
−screen screennum WxHxD

This option creates screen screennum and sets its width, height, and
depth to W, H, and D respectively. By default, only screen 0 exists and
has the dimensions 1280x1024x8.
"


Where the last number is the depth.  Previously Adam mentioned that GLX
only works at 16 or 32.  I just noticed an inconsistency.  It would
seem feasible to try that command if xvfb-run takes the switches xvfb
does. I am thinking;
xvfb-run -s '-screen 0 1024x768x32'

  or 

xvfb-run -s 'screen 0 1024x768x16'  


If you follow what I am saying. 


-eg

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

[Antoine Martin]

On 12/12/16 20:37, Roland Mainz wrote:
> On Mon, Dec 12, 2016 at 8:27 PM, Antoine Martin  wrote:
>> On 12/12/16 19:51, Long Vu wrote:
>>> On Mon, Dec 12, 2016 at 1:06 PM, Long Vu  wrote:
 On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson  wrote:
> On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
>
>> Would it be this xvfb-run option ?
>>
>> -s ARGS   --server-args=ARGSarguments (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' 
>>>
>>> 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...
For most people, using a different command line (Xdummy's or virtualgl
instead of Xvfb) will be a lot easier than recompiling the X11 server.
Especially for managing multiple deployments or handling system updates.

Cheers
Antoine

> 
> 
> Bye,
> Roland
> 

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

[Long Vu]

On Mon, Dec 12, 2016 at 2:34 PM, Eric Gunther  wrote:
> On Mon, 2016-12-12 at 13:51 -0500, Long Vu wrote:
>
> I don't know if this will help, but previously adam had said:
>
>> How are you launching Xvfb? I believe it defaults to 8bpp, but GLX
> only
>> works at 16 or 32bpp.
>
> which I think you hadn't tried yet.
>

Well I did with

xvfb-run -s '-screen 0 1024x768x24 +extension GLX +iglx' 

I though the adding x24 to the screen is what Adam meant.

If I miss understood, kindy point out to me because I am not familiar
with X server options.

Thanks.


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Re: 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  wrote:
> On 12/12/16 19:51, Long Vu wrote:
>> On Mon, Dec 12, 2016 at 1:06 PM, Long Vu  wrote:
>>> On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson  wrote:
 On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:

> Would it be this xvfb-run option ?
>
> -s ARGS   --server-args=ARGSarguments (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' 
>>
>> 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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Re: How to avoid this Xvfb error: ES2 Prism: Error - GLX extension is not supported

[Eric Gunther]

On Mon, 2016-12-12 at 13:51 -0500, Long Vu wrote:
> On Mon, Dec 12, 2016 at 1:06 PM, Long Vu 
> wrote:
> > On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson 
> > wrote:
> > > On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
> > > 
> > > > Would it be this xvfb-run option ?
> > > > 
> > > > -s ARGS   --server-args=ARGSarguments (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' 
> 
> I don't know what else to try.
> 
> 
> -- 
> Long Vu | Build Controller | Intelerad | +1-514-931-6222 ext. 7743



I don't know if this will help, but previously adam had said:

> How are you launching Xvfb? I believe it defaults to 8bpp, but GLX
only
> works at 16 or 32bpp.

which I think you hadn't tried yet.


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

[Antoine Martin]

On 12/12/16 19:51, Long Vu wrote:
> On Mon, Dec 12, 2016 at 1:06 PM, Long Vu  wrote:
>> On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson  wrote:
>>> On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
>>>
 Would it be this xvfb-run option ?

 -s ARGS   --server-args=ARGSarguments (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' 
> 
> 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/

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

[Long Vu]

On Mon, Dec 12, 2016 at 1:06 PM, Long Vu  wrote:
> On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson  wrote:
>> On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
>>
>>> Would it be this xvfb-run option ?
>>>
>>> -s ARGS   --server-args=ARGSarguments (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' 

I don't know what else to try.


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

[Long Vu]

On Mon, Dec 12, 2016 at 12:20 PM, Adam Jackson  wrote:
> On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:
>
>> Would it be this xvfb-run option ?
>>
>> -s ARGS   --server-args=ARGSarguments (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?


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

[Adam Jackson]

On Mon, 2016-12-12 at 12:13 -0500, Long Vu wrote:

> Would it be this xvfb-run option ?
> 
> -s ARGS   --server-args=ARGSarguments (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

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

[Long Vu]

On Mon, Dec 12, 2016 at 12:08 PM, Long Vu  wrote:
> On Mon, Dec 12, 2016 at 11:15 AM, Adam Jackson  wrote:
>> On Fri, 2016-12-09 at 14:09 -0500, Long Vu wrote:
>>> Hi,
>>>
>>> We use Xvfb to avoid having to run an X server on our build machine.
>>>
>>> We got this error with Xvfb that we do not have when we were running a
>>> real VNC server just to provide X.
>>>
>>> ES2 Prism: Error - GLX extension is not supported
>>>GLX version 1.3 or higher is required
>>> Xlib:  extension "RANDR" missing on display ":99".
>>>
>>> Is there something we can do to avoid this error?
>>
>> How are you launching Xvfb? I believe it defaults to 8bpp, but GLX only
>> works at 16 or 32bpp.
>
> We just run it as plain `xvfb-run `.
>
> So you are suggesting maybe there are xvfb-run options that we can use
> to overcome this?  This would be awesome !!!  Will check the help of
> xvfb-run right now.
>

Would it be this xvfb-run option ?

-s ARGS   --server-args=ARGSarguments (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?


>>
>> - ajax
>
>
>
> --
> Long Vu | Build Controller | Intelerad | +1-514-931-6222 ext. 7743



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

[Long Vu]

On Mon, Dec 12, 2016 at 11:15 AM, Adam Jackson  wrote:
> On Fri, 2016-12-09 at 14:09 -0500, Long Vu wrote:
>> Hi,
>>
>> We use Xvfb to avoid having to run an X server on our build machine.
>>
>> We got this error with Xvfb that we do not have when we were running a
>> real VNC server just to provide X.
>>
>> ES2 Prism: Error - GLX extension is not supported
>>GLX version 1.3 or higher is required
>> Xlib:  extension "RANDR" missing on display ":99".
>>
>> Is there something we can do to avoid this error?
>
> How are you launching Xvfb? I believe it defaults to 8bpp, but GLX only
> works at 16 or 32bpp.

We just run it as plain `xvfb-run `.

So you are suggesting maybe there are xvfb-run options that we can use
to overcome this?  This would be awesome !!!  Will check the help of
xvfb-run right now.

>
> - ajax



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

[Adam Jackson]

On Fri, 2016-12-09 at 14:09 -0500, Long Vu wrote:
> Hi,
> 
> We use Xvfb to avoid having to run an X server on our build machine.
> 
> We got this error with Xvfb that we do not have when we were running a
> real VNC server just to provide X.
> 
> ES2 Prism: Error - GLX extension is not supported
>    GLX version 1.3 or higher is required
> Xlib:  extension "RANDR" missing on display ":99".
> 
> Is there something we can do to avoid this error?

How are you launching Xvfb? I believe it defaults to 8bpp, but GLX only
works at 16 or 32bpp.

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

[Long Vu]

Hi,

We use Xvfb to avoid having to run an X server on our build machine.

We got this error with Xvfb that we do not have when we were running a
real VNC server just to provide X.

ES2 Prism: Error - GLX extension is not supported
   GLX version 1.3 or higher is required
Xlib:  extension "RANDR" missing on display ":99".

Is there something we can do to avoid this error?

We are using this version of xvfb on Centos 7:
xorg-x11-server-Xvfb-1.17.2-10.el7.x86_64

Thanks,

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

[Long Vu]

Hi,

We use Xvfb to avoid having to run an X server on our build machine.

We got this error with Xvfb that we do not have when we were running a
real VNC server just to provide X.

ES2 Prism: Error - GLX extension is not supported
   GLX version 1.3 or higher is required
Xlib:  extension "RANDR" missing on display ":99".

Is there something we can do to avoid this error?

We are using this version of xvfb on Centos 7:
xorg-x11-server-Xvfb-1.17.2-10.el7.x86_64

Thanks,

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