pyopengl-users

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

[Abhijeet R. <abh...@gm...>]

Hi guyz,

I need your help. After a day long process, I have finally completed a C++
pyopengl+glut project to python. Thanks for your help in making me move
forward when I was stuck.

Now, I have made to the code line by line same, all variable names same &
even the order in which functions are written (even comments copied :P) but
still the code is not executing perfectly.
So the issue is about converting C++ to python successfully.

Window0 ie left one doesnt load successfully, There is some problem of
loading the windows..

DETAILS:-
^^^^^^^^^^
Screenshot of the issue:- http://i.imgur.com/qDax9.png
C++ & python source code + images (SIZE 23KB) :
http://dl.dropbox.com/u/7728421/paint.tar.gz
C++ code (if you dont want to download): http://sprunge.us/JLOC?cpp
Python source (if you dont want to download): http://sprunge.us/IVdG?python

Error in console,
^^^^^^^^^^^^^^^
http://sprunge.us/gQRI

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.*
Please guyz help me making a working python clone of the code. I have to get
this done till tomorrow somehow. Any kind of help would
be greatly appreciated.

-- 
Regards,
Abhijeet Rastogi (shadyabhi)
http://www.google.com/profiles/abhijeet.1989

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

[Derakon <de...@gm...>]

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

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

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

[Abhijeet R. <abh...@gm...>]

On Mon, Apr 18, 2011 at 4:41 AM, Mike C. Fletcher <mcf...@vr...>wrote:

>
> You are calling glGenTextures before you have a valid OpenGL context,
> this results in getting 4 values of 0 for the textures.  Instead, only
>

Instead of doing

textures = glGenTextures(TEX_COUNT)

in main, I did it in drawRAWs function

global textures
textures = glGenTextures(TEX_COUNT)

Now, the textures are loaded perfectly but they are not selected and give
some error. Googling (
http://pyopengl.sourceforge.net/documentation/opengl_diffs.html) told me
that there are some differences the way selection buffers are handled. By
the way, the error which I get is

Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 313, in 'calling callback function'
  File "main.py", line 651, in mouseWin2
    selection(x, y, 2)
  File "main.py", line 299, in selection
    choiche = selectBuff[(hits*4)-1]
TypeError: unsupported operand type(s) for -: 'list' and 'int'


I know, I have used python datatype wrongly. I am figuring out how to do it.
If I am not successful, I will ask the question on mailling list again.
Thanks for your helo so far.

-- 
Regards,
Abhijeet Rastogi (shadyabhi)
http://www.google.com/profiles/abhijeet.1989