Re: [PyOpenGL-Users] Anyone have a working script using PyOpenGL with threads?

[<il...@ya...>]

Hi.

I've used threads before with pyopengl.  I use them
when flipping the backbuffer.  As on some(many?)
machines you have a lot of free cpu time which
otherwise gets wasted.

the code I used is old and rotten :)  It relies on
other code which has morphed into other stuff.  So
I'll paste the thread parts.


from threading import Thread

import threading

class SomeThread(Thread):

    def __init__(self):

        Thread.__init__(self)
        self.an_event = threading.Event()

    def run(self):
        # do some calculations here.
        map(cos, xrange(1000))


a_thread = SomeThread()


Then in the main loop(this is with pygame which allows
you to have a main loop).


DrawOpenGLStuff()

# start off thread.
if not (threading_activeCount() > 1):
    a_thread.start()

# flip back buffer
pygame.display.flip()


I guess this is not how you want to use threads. 
Maybe you could post some code that we could test? 
The problem might be to do with your driver/platform.




 --- "Mike C. Fletcher" <mcf...@ro...> wrote: >
I've been trying to make OpenGLContext use a model
> where a background 
> server thread does the rendering to allow foreground
> threads to be 
> application-specific & largely unconcerned with the
> rendering operations.
> 
> However, whenever I try to put the rendering thread
> in the background, 
> the entire works gets gummed up, with the symptoms
> looking like the 
> OpenGL calls just aren't writing to the buffers at
> all (the results from 
> previous runs are present, along with random data,
> etceteras), though 
> the swap-buffers methods seem to be working for both
> GLUT and wx.  I'm 
> using the context.setCurrent equivalents for the
> various contexts, BTW.
> 
> I'd love to see a script using threads + OpenGL so I
> can figure out what 
> I'm doing wrong here.  I assume it's something dumb,
> but I can't figure 
> out what.
> 
> Any help appreciated,
> Mike


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