Re: [PyOpenGL-Users] second call to glGenFramebuffersEXT() crashes

[Joshua R. D. <jd...@ca...>]

----- Original Message -----
From: "Mike C. Fletcher" <mcf...@vr...>
To: "Joshua R. Davis" <jd...@ca...>
Cc: pyo...@li...
Sent: Saturday, February 14, 2009 5:10:59 PM GMT -06:00 US/Canada Central
Subject: Re: [PyOpenGL-Users] second call to glGenFramebuffersEXT() crashes

Joshua R. Davis wrote:
> > I am trying to cast shadows from multiple lights using shaders. I use one framebuffer object per light. When I have just one light, it works. When I try two lights, the program survives the first call to glGenFramebuffersEXT() but crashes ("Bus error") upon the second call to it.

[snip]

> If you can run the script above instead of directly accessing the 
functions from the DLL we may be able to track down the problem further.

Thanks a lot, Mike. I no longer crash when making multiple calls to glGenFramebuffersEXT(). However, I now crash on the first call to glBindFramebufferEXT(). This demo...

#! /usr/bin/env python
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from OpenGL.GL.EXT.framebuffer_object import *
def main():
    glutInit(0)
    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH)
    glutCreateWindow('test')
    framebuffer = glGenFramebuffersEXT(1)
    print framebuffer
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer)
if __name__ == "__main__":
    main()

...produces this error:

> python fbotest.py
1
Traceback (most recent call last):
  File "fbotest.py", line 14, in <module>
    main()
  File "fbotest.py", line 12, in main
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/PyOpenGL-3.0.0b6-py2.5.egg/OpenGL/platform/baseplatform.py", line 275, in __call__
    return self( *args, **named )
ctypes.ArgumentError: argument 2: <type 'exceptions.TypeError'>: wrong type

This kind of code used to work, when I was using the DLL. Can anyone help?

Joshua Davis