pyopengl-users

[PyOpenGL-Users] Problem with PyOpenGL support under cygwin: ctypes cannot find GL lib(?)

[Martin F. <fe...@in...>]

Hi,

in trying to get my python OpenGL application to run under cygwin, I 
installed the
PyOpenGL package, version 3.0.0a5 for python 2.4, and ctypes 1.0.1. For 
one thing, could it be the .egg is broken? I keep getting


225> easy_install PyOpenGL-3.0.0a5-py2.4.egg
Processing PyOpenGL-3.0.0a5-py2.4.egg
Traceback (most recent call last):
   File "/usr/bin/easy_install", line 7, in ?
     sys.exit(
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 1670, in m
ain
     with_ei_usage(lambda:
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 1659, in w
ith_ei_usage
     return f()
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 1674, in <
lambda>
     distclass=DistributionWithoutHelpCommands, **kw
   File "/tmp/python.340/usr/lib/python2.4/distutils/core.py", line 149, 
in setup
   File "/tmp/python.340/usr/lib/python2.4/distutils/dist.py", line 946, 
in run_commands
   File "/tmp/python.340/usr/lib/python2.4/distutils/dist.py", line 966, 
in run_command
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 211, in ru
n
     self.easy_install(spec, not self.no_deps)
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 427, in ea
sy_install
     return self.install_item(None, spec, tmpdir, deps, True)
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 471, in in
stall_item
     dists = self.install_eggs(spec, download, tmpdir)
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 619, in in
stall_eggs
     return [self.install_egg(dist_filename, tmpdir)]
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 670, in in
stall_egg
     dist = self.egg_distribution(egg_path)
   File 
"/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/setuptools/command/easy_install.py", 
line 661, in eg
g_distribution
     metadata = EggMetadata(zipimport.zipimporter(egg_path))
zipimport.ZipImportError: not a Zip file: 'PyOpenGL-3.0.0a5-py2.4.egg'


Well, anyway, the .zip file worked. Now
whenever I try to run an OpenGL application, the following happens:

Traceback (most recent call last):
   File "GLvis.py", line 8, in ?
     from OpenGL.GL import *
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/GL/__init__.py", 

line 2, in ?
     from OpenGL.raw.GL import *
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/raw/GL/__init__.py", 

line 6, in ?
     from OpenGL.raw.GL.constants import *
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/raw/GL/constants.py", 

line 7, in ?
     from OpenGL import platform, arrays
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/__init__.py", 

line 24, in ?
     from OpenGL.platform.glx import *
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/glx.py", 

line 29, in ?
     mode=ctypes.RTLD_GLOBAL
   File
"/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/ctypesloader.py", 

line 37, in loadLibrary
     return dllType( name, mode )
   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 312,
in __init__
     self._handle = _dlopen(self._name, mode)
OSError: No such file or directory

When this happens, self._name is "GL" and mode is 4. It would seem as
though somehow the GL library is not registered(?) with python? I'm at a
loss here - can anybody give me a hint? Has there been any successful
attempt at running PyOpenGL under cygwin?

I append a cygwin configuration dump.

Thanks,
Martin

Re: [PyOpenGL-Users] Problem with PyOpenGL support under cygwin: ctypes cannot find GL lib(?)

[Mike C. F. <mcf...@vr...>]

Martin Felder wrote:
> Hi,
>
> in trying to get my python OpenGL application to run under cygwin, I 
> installed the
> PyOpenGL package, version 3.0.0a5 for python 2.4, and ctypes 1.0.1. 
> For one thing, could it be the .egg is broken? I keep getting
>
The .egg uploaded to the CheeseShop for some reason appears as a 
corrupted.zip.  The one on SourceForge appears to work (I just installed 
from that on Win32 yesterday).
...
> zipimport.ZipImportError: not a Zip file: 'PyOpenGL-3.0.0a5-py2.4.egg'
I'll try to get the next release out ASAP to fix that.  It's about time 
for one anyway.
> Well, anyway, the .zip file worked. Now
> whenever I try to run an OpenGL application, the following happens:
...
> line 29, in ?
>     mode=ctypes.RTLD_GLOBAL
>   File
> "/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/ctypesloader.py", 
>
> line 37, in loadLibrary
>     return dllType( name, mode )
>   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 312,
> in __init__
>     self._handle = _dlopen(self._name, mode)
> OSError: No such file or directory
>
> When this happens, self._name is "GL" and mode is 4. It would seem as
> though somehow the GL library is not registered(?) with python? I'm at a
> loss here - can anybody give me a hint? Has there been any successful
> attempt at running PyOpenGL under cygwin?
AFAIK there has been no successful attempt.  From what I understand one 
of the tools inside ctypes is using an operation that doesn't work under 
cygwin, so it winds up unable to find the .so files.  I haven't yet gone 
to the trouble of installing cygwin w/X in order to track down the 
problem.  Likely we'll need to rewrite the find_library code to be able 
to deal with cygwin (and hopefully get that into ctypes for the next 
release).

Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com

Re: [PyOpenGL-Users] Problem with PyOpenGL support under cygwin: ctypes cannot find GL lib(?)

[Thomas H. <th...@ct...>]

Mike C. Fletcher schrieb:
> Martin Felder wrote:
>> Hi,
>>
>> in trying to get my python OpenGL application to run under cygwin, I 
>> installed the
>> PyOpenGL package, version 3.0.0a5 for python 2.4, and ctypes 1.0.1. 
>> For one thing, could it be the .egg is broken? I keep getting
>>
> The .egg uploaded to the CheeseShop for some reason appears as a 
> corrupted.zip.  The one on SourceForge appears to work (I just installed 
> from that on Win32 yesterday).
> ...
>> zipimport.ZipImportError: not a Zip file: 'PyOpenGL-3.0.0a5-py2.4.egg'
> I'll try to get the next release out ASAP to fix that.  It's about time 
> for one anyway.
>> Well, anyway, the .zip file worked. Now
>> whenever I try to run an OpenGL application, the following happens:
> ...
>> line 29, in ?
>>     mode=ctypes.RTLD_GLOBAL
>>   File
>> "/usr/lib/python2.4/site-packages/PyOpenGL-3.0.0a5-py2.4.egg/OpenGL/platform/ctypesloader.py", 
>>
>> line 37, in loadLibrary
>>     return dllType( name, mode )
>>   File "/usr/lib/python2.4/site-packages/ctypes/__init__.py", line 312,
>> in __init__
>>     self._handle = _dlopen(self._name, mode)
>> OSError: No such file or directory
>>
>> When this happens, self._name is "GL" and mode is 4. It would seem as
>> though somehow the GL library is not registered(?) with python? I'm at a
>> loss here - can anybody give me a hint? Has there been any successful
>> attempt at running PyOpenGL under cygwin?
> AFAIK there has been no successful attempt.  From what I understand one 
> of the tools inside ctypes is using an operation that doesn't work under 
> cygwin, so it winds up unable to find the .so files.  I haven't yet gone 
> to the trouble of installing cygwin w/X in order to track down the 
> problem.  Likely we'll need to rewrite the find_library code to be able 
> to deal with cygwin (and hopefully get that into ctypes for the next 
> release).

I haven't run ctypes under cygwin for a long time, so I'm not sure any longer
it works correctly.  However, if someone provides working patches I will
consider to accept them.

Thomas