Go Back   nV News Forums > Linux Support Forums > NVIDIA Linux

Newegg Daily Deals

Thread Tools
Old 10-08-02, 04:36 PM   #1
Posts: n/a
Question Missing GL extensions


I think I must be doing something stupid.

I have installed the 3123 drivers on redhat 7.3.
X works fine. When I run the command "glxinfo", I get a huge list of supported extensions.

In my app, when I query the extension list via glGetString (GL_EXTENSIONS), the list is very short. I do get a reasonable looking renderer and gl version. Also, my GLX extension list is shorter (no pbuffers, for example).

When I run my app, it runs fast enough that I am pretty sure it must be using the nvidia drivers.

Here is what my application logs:

Renderer: "Quadro DCC/AGP/3DNOW!"

Extensions: "GL_ARB_multitexture GL_ARB_imaging GL_EXT_abgr GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract "

GL version: 1.3 ("1.3.1 NVIDIA 31.23")

GLX Extensions: "GLX_EXT_visual_info GLX_EXT_visual_rating GLX_EXT_import_context "

What am I missing?

  Reply With Quote
Old 10-08-02, 05:02 PM   #2
Registered User
Join Date: Jul 2002
Posts: 1,293

This is really just a guess, but it seems to me that perhaps the wrong GL library is being referenced?

I believe the default library referenced should be lib.gl.so.1 (or something like that...). Make sure that this is linked to the library included in the drivers you downloaded.
Chalnoth is offline   Reply With Quote
Old 10-08-02, 06:47 PM   #3
Registered User
Join Date: Sep 2002
Posts: 2,262

What's your code look like?

I did see something that might be relevant, in the glGetString() manpage:

The client and server may support different versions or extensions. glGetString always returns a compatible version number or list of extensions.
So if the X server isn't on the same box as the client (your program), then that might be the problem. I don't know if that's what you're trying to do or not, though...

Like I said, post your code, that might help...
Registered Linux User #219692
bwkaz is offline   Reply With Quote
Old 10-08-02, 09:14 PM   #4
Posts: n/a

Thanks for your replies.

Here is /usr/lib/libGL*. I think it looks ok.

lrwxrwxrwx 1 root root 21 Oct 7 20:01 /usr/lib/libGLcore.so.1 -> libGLcore.so.1.0.3123*
-r-xr-xr-x 1 root root 3623820 Aug 27 19:36 /usr/lib/libGLcore.so.1.0.3123*
lrwxrwxrwx 1 root root 10 Oct 7 20:01 /usr/lib/libGL.so -> libGL.so.1*
lrwxrwxrwx 1 root root 17 Oct 7 20:01 /usr/lib/libGL.so.1 -> libGL.so.1.0.3123*
-r-xr-xr-x 1 root root 283444 Aug 27 19:36 /usr/lib/libGL.so.1.0.3123*
lrwxrwxrwx 1 root root 33 Oct 7 13:30 /usr/lib/libGLU.so -> ../../usr/X11R6/lib/libGLU.so.1.3*
lrwxrwxrwx 1 root root 33 Oct 7 13:16 /usr/lib/libGLU.so.1 -> ../../usr/X11R6/lib/libGLU.so.1.3*

If I break my program at glGetString, then gdb tells me that it is in
0x40caaa50 0x40cd41ac Yes /usr/lib/libGL.so.1

So, I think that the right libGL is being used.

I am displaying to my local machine.
  Reply With Quote
Old 10-08-02, 10:25 PM   #5
Posts: n/a
Default Found problem (thanks)

I found the problem. I was trying to create a simple code example for you all to look at and I noticed that it worked - so it was definitely my app.

I added a call to glXMakeCurrent before querying for extensions and now I have them all. I thought it was already current I guess it was not. The bizarre thing is that I thought glGetString normally returned NULL if there was no context current

Again, thanks for your replies.
  Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Video: The Missing Mathematics of Extreme Scale Simulation News Archived News Items 0 09-24-12 01:10 PM
Missing Video Modes Enverex NVIDIA Linux 0 06-22-12 06:30 AM
IBM Courts the Missing Middle with Platform Computing and One-Stop Shopping News Archived News Items 0 06-04-12 10:20 AM
TNT2 - DXTC/ S3TC extensions .. DarkYY NVIDIA Linux 19 10-01-02 12:31 PM
Glx mrbig1344 NVIDIA Linux 7 09-30-02 06:45 AM

All times are GMT -5. The time now is 03:15 AM.

Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.