[visionegg] Re: New User, Seg Fault




Andrew,

>>>> Pygame Parachute Traceback:
>>>>   File
>>>> "C:\Python22\Lib\site-packages\VisionEgg\PlatformDependent.py",
>>>> line 192, in sync_swap_with_vbl_post_gl_init
>>>> Fatal Python error: (pygame parachute) Segmentation Fault
>>>


>>
>> I turned off the option to synchronize buffer swaps.  This had no
>> noticeable effect.
>
>Darn -- this means the error message above has little correlation to
>the error and will make it difficult to track down.  Something is
>crashing at the C level (not in the Python interpreter, where we'd get
>a nice error message). Perhaps a required library started a thread
>which crashes, bringing down the whole app.  Just to check, did you
>install the exact versions of the libraries as listed on the VE Windows
>install page?

Yes.  I didn't even go to the linked websites; just downloaded them
straight from the link on that page.

>My immediate, unfounded suspicion falls on Tkinter (the GUI
>environment). Try turning it off by inserting the following into the
>beginning of the demo script (before the create_default_screen() call):
>
>import VisionEgg
>VisionEgg.config.VISIONEGG_GUI_INIT=0
>

This suppressed the GUI console, and the output stopped short of the pygame
parachute traceback quoted at the top.  In the following output,
grating_ASIF_BK.py is the original code, and grating.py has the above two
lines inserted:

----BEGIN original code----
C:\visionegg\visionegg-0.9.5b3\demo>python grating_ASIF_BK.py
2003-09-18 10:45:00,577 (1640) INFO: Script grating_ASIF_BK.py started
Vision Egg 0.9.5b3 with process id 1640.
2003-09-18 10:45:04,493 (1640) INFO: Requesting window 640 x 480 32 bpp (8
8 8 0 RGBA).
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 10:45:04,554 (1640) INFO: OpenGL 1.3.0 - Build 4.14.10.3619,
Intel Brookdale-G, Intel
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 10:45:04,554 (1640) INFO: Video system reports 32 bpp (8 8 8 8
RGBA).
(sent using deprecated VisionEgg.Core.Message class)
Pygame Parachute Traceback:
  File "C:\Python22\Lib\site-packages\VisionEgg\PlatformDependent.py", line
192, in sync_swap_with_vbl_post_gl_init
Fatal Python error: (pygame parachute) Segmentation Fault

This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.
----END----

----BEGIN modified code----
C:\visionegg\visionegg-0.9.5b3\demo>python grating.py
2003-09-18 10:45:20,343 (2372) INFO: Script grating.py started Vision Egg
0.9.5b3 with process id 23
72.
2003-09-18 10:45:20,485 (2372) INFO: Requesting window 640 x 480 32 bpp (8
8 8 0 RGBA).
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 10:45:20,547 (2372) INFO: OpenGL 1.3.0 - Build 4.14.10.3619,
Intel Brookdale-G, Intel
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 10:45:20,547 (2372) INFO: Video system reports 32 bpp (8 8 8 8
RGBA).
(sent using deprecated VisionEgg.Core.Message class)

C:\visionegg\visionegg-0.9.5b3\demo>
----END----


>It could be a PyOpenGL problem. Try running a few demos in
>c:\Python22\Lib\site-packages\OpenGL/Demo.

Most of these from what I tested worked fine.  /Tom/fog.py and /Tom/Logo.py
didn't work.  The rest seemed to work fine.

>Also, try running
>c:\Python22\Lib\site-packages\VisionEgg\test\opengl_info.py from the
>command line so you can see the results.  Also, the conform.py test in
>there turns off Tkinter and tests lots of things, so it's worth a test.)

Um, I don't have a test folder in this directory. . .
I found these files under c:\visionegg\visionegg-0.9.5b3\test\
conform.py didn't seem to work -- see below.


---BEGIN output for opengl_info.py---
C:\visionegg\visionegg-0.9.5b3\test>python opengl_info.py
Initializing graphics at 640 x 480 ( 0 bpp ).

OpenGL information returned from OpenGL drivers:
 GL_VENDOR = Intel
 GL_RENDERER = Intel Brookdale-G
 GL_VERSION =  1.3.0 - Build 4.14.10.3619
 GL_EXTENSIONS =
                 GL_ARB_multitexture
                 GL_ARB_texture_border_clamp
                 GL_ARB_texture_compression
                 GL_ARB_texture_cube_map
                 GL_ARB_texture_env_add
                 GL_ARB_texture_env_combine
                 GL_ARB_texture_env_dot3
                 GL_ARB_texture_env_crossbar
                 GL_ARB_transpose_matrix
                 GL_EXT_abgr
                 GL_EXT_bgra
                 GL_EXT_blend_color
                 GL_EXT_blend_func_separate
                 GL_EXT_blend_minmax
                 GL_EXT_blend_subtract
                 GL_EXT_clip_volume_hint
                 GL_EXT_compiled_vertex_array
                 GL_EXT_cull_vertex
                 GL_EXT_fog_coord
                 GL_EXT_packed_pixels
                 GL_EXT_packed_pixels_12
                 GL_EXT_rescale_normal
                 GL_EXT_secondary_color
                 GL_EXT_separate_specular_color
                 GL_EXT_stencil_wrap
                 GL_EXT_texture_compression_s3tc
                 GL_EXT_texture_env_add
                 GL_EXT_texture_env_combine
                 GL_EXT_texture_filter_anisotropic
                 GL_3DFX_texture_compression_FXT1
                 GL_IBM_texture_mirrored_repeat
                 GL_NV_texgen_reflection
                 GL_WIN_swap_hint


C:\visionegg\visionegg-0.9.5b3\test>
---END---

---BEGIN conform.py---
C:\visionegg\visionegg-0.9.5b3\test>python conform.py
2003-09-18 11:13:17,381 (1604) INFO: Script conform.py started Vision Egg
0.9.5b3 with process id 16
04.
2003-09-18 11:13:17,600 (1604) INFO: Requesting window 512 x 512 32 bpp (8
8 8 0 RGBA).
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 11:13:17,662 (1604) INFO: OpenGL 1.3.0 - Build 4.14.10.3619,
Intel Brookdale-G, Intel
(sent using deprecated VisionEgg.Core.Message class)
2003-09-18 11:13:17,662 (1604) INFO: Video system reports 32 bpp (8 8 8 8
RGBA).
(sent using deprecated VisionEgg.Core.Message class)

C:\visionegg\visionegg-0.9.5b3\test>
---END---


>It could be a pygame/SDL problem.  Try the flames_pygame.py demo (in
>the standard VE demos), which uses pygame but not OpenGL.
>
>Please let us know what you find!

The GUI console did not come up for this like it did for the other VE
demos.

---BEGIN flames_pygame.py---
C:\visionegg\visionegg-0.9.5b3\demo>python flames_pygame.py
2003-09-18 11:16:24,006 (2644) INFO: Script flames_pygame.py started Vision
Egg 0.9.5b3 with process
 id 2644.
536870912
Traceback (most recent call last):
  File "flames_pygame.py", line 139, in ?
    if __name__ == '__main__': main()
  File "flames_pygame.py", line 69, in main
    blitdouble(screen, flame, doubleflame)
  File "flames_pygame.py", line 135, in blitdouble
    blit_array(screen, doubleflame)
ValueError: unsupported datatype for array
---END---


>You're right -- this is not the problem. Also, now that I know this is
>your "default" drive, I think it can safely be said that this is the
>desired behavior for os.path.expanduser('~'). A bit of history on this:
>it is often useful for Vision Egg to be able to write configuration
>files.  Operating systems other than Windows don't let apps just write
>files into system directories (and there must be some way to get
>Windows to act this way, too), so the challenge was to find a
>(cross-platform) way of allowing non-privileged users to save files. I
>don't know what the Windows standard for this is (if it exists), but I
>thought the above method was probably best -- rely on Python to do the
>Right Thing.  So, it's actually comforting that this is your default
>drive. The question is whether you, as the user, feel this is the right
>place for the Vision Egg to save user-specific configuration files.
>(And also whether other Windows users would agree with you.)

Works for me.  It's probably a good thing, because I don't have access to
the entirety of my local drive, anyway.  So placing files in say C:\Program
Files\ is not allowed -- (I actually had to call IT to have them remotely
log into my machine and update my video driver because the installer for it
wanted to create a c:\program files\installshield directory, which requires
Admin privileges.)

Well I have not a clue as to the implications of the output I have passed
on to you, so I guess I shall just wait.

--
Asif Ladak




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