[visionegg] opengl issue

i'm trying to use visionegg for displaying text screens.  i have this
working if i approach the python code as a script.

for better software engineering, i've started to modularize my code into
classes.  when i do this, this weird error pops up:

------------------------
2004-04-12 20:10:06,967 (1372) CRITICAL: Traceback (most recent call last):
  File "C:\Pylink\work\Experiment.py", line 72, in ?
    exp.parser.CreateStimuli()
  File "C:\Pylink\work\Parsers.py", line 81, in CreateStimuli
    text = VisionEgg.Text.Text(text = line, **params)
  File "C:\Python22\lib\site-packages\VisionEgg\Text.py", line 154, in __init__
    VisionEgg.Textures.TextureStimulus.__init__(self,**kw)
  File "C:\Python22\lib\site-packages\VisionEgg\Textures.py", line 1312, in __in
it__
    TextureStimulusBaseClass.__init__(self,**kw)
  File "C:\Python22\lib\site-packages\VisionEgg\Textures.py", line 1061, in __in
it__
    self.parameters.texture_wrap_s = gl.GL_CLAMP_TO_EDGE
AttributeError: 'module' object has no attribute 'GL_CLAMP_TO_EDGE'

Traceback (most recent call last):
  File "C:\Pylink\work\Experiment.py", line 72, in ?
    exp.parser.CreateStimuli()
  File "C:\Pylink\work\Parsers.py", line 81, in CreateStimuli
    text = VisionEgg.Text.Text(text = line, **params)
  File "C:\Python22\lib\site-packages\VisionEgg\Text.py", line 154, in __init__
    VisionEgg.Textures.TextureStimulus.__init__(self,**kw)
  File "C:\Python22\lib\site-packages\VisionEgg\Textures.py", line 1312, in __in
it__
    TextureStimulusBaseClass.__init__(self,**kw)
  File "C:\Python22\lib\site-packages\VisionEgg\Textures.py", line 1061, in __in
it__
    self.parameters.texture_wrap_s = gl.GL_CLAMP_TO_EDGE
AttributeError: 'module' object has no attribute 'GL_CLAMP_TO_EDGE'
-----------------

when i run checkconfig.py it says that everything is fine, and like i've
said, running my old script version of the program is fine.

here's the Parsers.py file that does the instantiation:

--------------------------
#!/usr/bin/env python
"""
   various materials parsers and the generic material parser

   please understand how to use regular expressions in python:
      http://diveintopython.org/regular_expressions/index.html
      http://www.amk.ca/python/howto/regex/regex.html

   written by jyi@xxxxxxxxx
"""

import string
import re
import VisionEgg.Text
from functions       import *

class generic:
   " generic parser... you need to inherit from this "
   def __init__(self, config):
      self.file = config.get('Filename','materials')
      self.__read()
      self.stims = []
      self.yspace = config.get('TextBox','yspace')
      self.w = config.getint('Screen','w')
      self.h = config.getint('Screen','h')

      if config.get('TextBox','align') == 'center':
         anch = 'center'
         pos = (self.w/2, self.h/2),
      else:
         anch = 'lowerleft'
         x = config.getint('TextBox','x')
         y = config.getint('TextBox','y')
         pos = (x, self.h-y)
      self.textparams = {
         'color'     : convIntList(config.get('Screen','fg')),
         'font_name' : config.get('Font','name'),
         'font_size' : config.getint('Font','size'),
         'position'  : pos,
         'anchor'    : anch
      }

   def __read(self):
      " private: reads-in the materials file "
      print "reading materials from", self.file
      try:
         f = open(self.file, 'r')
         self.lines = map(chomp, f.readlines())
         f.close()
      except IOError, (errno, strerror):
         print "### Error I/O (%s): %s" % (errno, strerror)

   def CreateStimuli(self):
      " the generic screens are separated by % "
      params = self.textparams
      tmpstim = []
      for line in self.lines:
         if line == '%':
            xpos = self.textparams['position'][0]
            ypos = self.textparams['position'][1]

            if self.textparams['anchor'] == 'center':
               nLines = len(tmpstim)
               if nLines > 1:
                  lineheight = tmpstim[0].parameters.size[1]
                  totsize = nLines*lineheight + (nLines-1)*self.yspace
                  ypos += totsize/2
                  for i in range(0, nLines):
                     tmpstim[i].set(position=(xpos, ypos))
                     ypos -= lineheight + yspace
            else:
               for i in range(0, len(tmpstim)):
                  ypos -= tmpstim[i].parameters.size[1]
                  tmpstim[i].set(position=(xpos, ypos))
                  ypos -= self.yspace

            self.stims.append(tmpstim)
            tmpstim = []
         else:
            if line == '': line = ' '  # fix blankspaces in materials
            text = VisionEgg.Text.Text(text = line, **params)
            tmpstim.append(text)
-------------------

help.
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