[PyOpenGL-Users] PyOpenGL and stereo

[Jack J. <Jac...@cw...>]

Is anyone using stereo with PyOpenGL? I've had absolutely no success 
with it, so far.

I started out with a rather complex program, where my PyOpenGL code was 
basically embedded in a large C-based OpenGL infrastructure (basically 
my Python code is only the redraw callback, all the double-buffer and 
left-right juggling and perspective matrices and such are handled for me 
in C).
This worked fine for the mono case, but when I ran the program in stereo 
I got to see the both viewpoints sort-of interspersed, with a lot of 
flickering and not in sync with the glasses.

I've slowly worked back, taking out bits and pieces of the system to 
narrow down the culprit, and I'm now at a minimal PyOpenGL GLUT-based 
program, which is basically the PyOpenGL GLE example with stereo turned 
on and the do_display() routine replaced by
	glDrawBuffer(GL_BACK_LEFT)
	glClearColor(0, 0, 1, 0)
	glClear(GL_COLOR_BUFFER_BIT)
	glDrawBuffer(GL_BACK_RIGHT)
	glClearColor(1, 0, 0, 0)
	glClear(GL_COLOR_BUFFER_BIT)
	# [see below]
	glutSwapBuffers()
and I see a blue background, nothing more. However, if I wiggle the 
mouse (which causes draw events, because the original GLE.py example 
code used that to rotate the tube) I see flashes of red.
To make matters more unintellegible, if I insert drawing code at the 
[see below] I do see what I draw here, but against the blue background! 
So, what I see is a non-stereo image consisting of the background color 
of the left buffer and the graphics in the right buffer??!?

None of these problems exist with C OpenGL code, so I tend towards 
blaming something PyOpenGL does for this.

What would be really helpful to me at this moment is a PyOpenGL script 
that is known to work, at least for someone on some machine, at some 
time:-)

This is all with PyOpenGL from the CVS HEAD (built with swig 1.3.9, 
later versions don't seem to work) with a few mods needed to make it 
compile (missing semicolons!). The machine is a dual 1.6GHz Pentium 
Linux box (2.4.9 kernel) with an ATI Rage XL graphics board.

Please reply to me directly (as well as possibly ccing to the list if 
it's deemed of general interest), I'm not on this list yet,
--
- Jack Jansen        <Jac...@or...>        
http://www.cwi.nl/~jack -
- If I can't dance I don't want to be part of your revolution -- Emma 
Goldman -