[PyOpenGL-Users] glDeleteBuffers() and arrays.vbo

[Dan H. <Dan...@no...>]

Hi all,

I may have found a bug in PyOpenGL's arrays.vbo module, but it could be 
a problem with my code or system. When a vertex or other buffer is 
automatically deleted by PyOpenGL's deleter, here's the error that I get:

Exception OpenGL.error.NullFunctionError: NullFunctionError('Attempt to 
call an undefined function glDeleteBuffers, check for 
bool(glDeleteBuffers) before calling',) in <function doBufferDeletion at 
0x0A8892B0> ignored

To me, that sounds like my OpenGL implementation (from Nvidia) doesn't 
implement glDeleteBuffers() for whatever reason. The deleter code in 
vbo.py appears to check for this, but it checks for an AttributeError 
rather than an OpenGL.error.NullFunctionError, or better yet, doing a 
protective bool(glDeleteBuffers) before actually calling glDeleteBuffers().

By the way, is it problematic that when doing a manual VBO.delete(), the 
automatic deleter is still invoked? Shouldn't VBO.delete() pop the 
deleter so glDeleteBuffers() isn't called twice for a particular VBO? Or 
is that not a problem?

Dan