Re: [PyOpenGL-Users] Converted C++ project to python project (some issues)

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

On 11-04-17 06:50 PM, Derakon wrote:
> On Sun, Apr 17, 2011 at 3:36 PM, Abhijeet Rastogi
> <abh...@gm...> wrote:
>> I have tried my best to explain the issue. Its probably a very small issue
>> with textures variable acquiring None value but I am not able to solve the
>> bug.
> Have you tried printing the value of the textures variable after each
> time it's changed? That should quickly tell you where it's going
> wrong.
>
> -Chris

Abhijeet, here's the changes I needed to make to get what I *think* is a working version of your code...


mcfletch@sturm:~/OpenGL-dev/imagesnone$ diff -w main-orig.py main.py
177c177
< textures = glGenTextures(TEX_COUNT)
---
> textures = None
318a319,321
>         global textures
>         if not textures:
>             textures = glGenTextures(TEX_COUNT)
325d327
<               global textures

You are calling glGenTextures before you have a valid OpenGL context,
this results in getting 4 values of 0 for the textures.  Instead, only
generate the texture ids the first time you need them.  BTW, watch your
indentation in Python, try to use either 4-space indents or if you feel
very strongly about it, literal tab characters, mixing tabs and spaces
is considered very bad form.

The modified form does not produce any tracebacks on my machine (a Linux
Ubuntu machine) until I hit one of the "buttons" in the palette.  Don't
have time to track down what that is, but it's likely a problem where
the return type for select buffer is a custom object type in PyOpenGL.

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