pyopengl-users

[PyOpenGL-Users] new graphics card

[Tom B. <to...@ne...>]

Hi,

I recently bought an  XFX Geforce 7800GS graphics card. The pyopengl 
application I was working on worked fine with my old ATI Radeon 9200 
graphics card. Now, the opengl rendering looks terrible.  The specs on 
the card state that it supports OpenGL 2.0. Is that my problem? Is my 
card too advanced for the MesaGL I'm using? Any ideas?

Thanks,
Tom

Re: [PyOpenGL-Users] new graphics card

[Tom B. <to...@ne...>]

On Thursday 27 July 2006 07:30, vwf wrote:
> On Thu, Jul 27, 2006 at 07:05:39AM -0700, Tom Brown wrote:
> > Hi,
> >
> > I recently bought an  XFX Geforce 7800GS graphics card. The
> > pyopengl application I was working on worked fine with my old ATI
> > Radeon 9200 graphics card. Now, the opengl rendering looks
> > terrible.  The specs on the card state that it supports OpenGL 2.0.
> > Is that my problem? Is my card too advanced for the MesaGL I'm
> > using? Any ideas?
>
> A year ago I had a similar problem: increasing the colour-depth to 24
> bit solved it. It may work for you too.
>
Sounds good. How do I change the colour-depth?

Thanks,
Tom

Re: [PyOpenGL-Users] new graphics card

[Tom B. <to...@ne...>]

On Friday 28 July 2006 00:32, vwf wrote:
> Just a few guesses:
> You use a GNU/Linux system.
> Most older distributions use XFree86.
Good guesses. I am using Debian Sarge which uses XFree86.

> Look up /etc/X11/XF86Config-4 and edit to set the DefaultDepth
>
> Section "Screen"
>         Identifier      "Default Screen"
>         Device          "NVidia GeForce"
>         Monitor         "LG915_FTplus"
>         DefaultDepth    24
> #<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< [...]
>         SubSection "Display"
>                 Depth           24
>                 Modes           "1280x1024" "1152x864" "1024x768"
> "800x600" EndSubSection
> [...]
> EndSection
>
> Restart and check /var/log/XFree86.0.log

I checked my XF86Config-4 and it was set to use 24 bit colour-depth as 
the default. So, that must not be it. Must be some setting the graphics 
card needs or a problem with the drivers I got from NVIDIA.  The OpenGL 
screen savers work ok though. So that doesn't make much sense to me. My 
application draws very slow.

Thanks,
Tom

Re: [PyOpenGL-Users] new graphics card

[Tom B. <to...@ne...>]

I think I've found the problem, just not the answer. I have two 
different OpenGL libraries on my system.  I have the Mesa3D OpenGL 
libraries I originally used. Then, the NVIDIA driver installation 
installed its own OpenGL libraries. So, when I figured this out I 
updated /etc/ld.co.conf so the NVIDIA libraries in /usr/lib would be 
found first. Well, this improved the performance of the OpenGL screen 
savers, but my OpenGL application crashed. I've given the output of the 
errors below. Any ideas would be appreciated.

Thanks,
Tom

tbrown@debian:~/projects/pyichess$ python -O pyichess.py 172.16.132.11 
player1
Connecting
Traceback (most recent call last):
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 377, in 
paintGL
    self.drawScene()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 586, in 
drawScene
    self.renderReflections()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 500, in 
renderReflections
    self.drawBoard()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 402, in 
drawBoard
    glPopMatrix()
OpenGL.GL.GLerror: [Errno 1281] invalid value
Traceback (most recent call last):
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 377, in 
paintGL
    self.drawScene()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 586, in 
drawScene
    self.renderReflections()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 500, in 
renderReflections
    self.drawBoard()
  File "/home/tbrown/projects/pyichess/myglwidget.py", line 402, in 
drawBoard
    glPopMatrix()
OpenGL.GL.GLerror: [Errno 1281] invalid value