Dear all,

I developed an application using LazOpenGLContext, one of the application user reported me that he got an error: gdk_gl_context_share_new no visual found.
Could you help me trying to identify the problem?
What may I ask to better understand the problem and how to solve it?

Andrea

It means the opengl driver does not support the needed context. For example by default the LazOpenGLContext wants 8bit red, green, blue and 24bit depth bits.

What may I ask to better understand the problem and how to solve it?

Ask to run in a terminal:
glxinfo

This gives the supported visuals.
Maybe he runs the program in a virtual machine with limited 3D support.

Mattias

Thanks Mattias, I will ask for the output of glxinfo and if they are running the application remotely or locally.
Anyway they also wrote me that the application worked till last week and now they got this error message. What can affect this modified behaviour? Andrea

Il 06/06/2014 10:07, Mattias Gaertner ha scritto:

Thanks Mattias, I will ask for the output of glxinfo and if they are running the application remotely or locally. Anyway they also wrote me that the application worked till last week and now they got this error message. What can affect this modified behaviour?

Probably something in front of the keyboard. ;)

Mattias

I asked for glxinfo they answered me that:
"the application runs remotely; I have a virtual host set up for me in the university.

If running via VNC, glxinfo outputs:

Xlib: extension ?GLX? missing on display ?:1.0? {many times followed by}
Error: couldn?t find RGB GLX visual or fbconfig

If running via ssh -X :

name of display: localhost:10.0
Error: couldn't find RGB GLX visual or fbconfig"

So, what can I do? What can I suggest them to make my application working again (it worked since last week)?

I don't think OpenGL works remotely through virtualization. At least, I've never heard about it.

Michael.

using
ssh -X
I am able to run remotely my app and visualize topenglcontext.. I will try to suggest it to the user.
Andrea

OK, it uses ssh -X too.
The problem is that I tried running my application from a Linux Virtual box installed on Linux and calling remotely the application from another Linux PC.
It works.
Additionally the user was able to run my application since last week. The application didn't change. I presume that something changed on the user server.
How can I interpret the messages:
"If running via ssh -X :

name of display: localhost:10.0
Error: couldn't find RGB GLX visual or fbconfig"

A display is identified but there is some problem with the framebuffer I presume (fbconfig).

Any suggestion?

Andrea

Il 06/06/2014 12:53, Andrea Mauri ha scritto:

Hi,

???? 6/6/2014 2:06 ??, ?/? Andrea Mauri ??????:

plz try with

export LIBGLALWAYSINDIRECT=yes

which tells libGL don't try to load any DRI driver meaning no direct rendering.

regards,