On a related note, I recently put together a simple pyglet script
which displays buffered frames from a webcam. I scheduled an update
function that got the next frame, and blitted it to the window. This
was scheduled every 1/30 seconds. The script used 80+% of CPU time and
the fps display said it was trying to draw at 60fps. Using
clock.set_fps_limit did nothing to limit the frame rate.
However, by overriding the default EventLoop.idle to stop it from
flipping the window every time idle() was called, and by explicitly
flipping it within the scheduled update function the CPU usage
decreased to ~30% and the playback was then perfectly smooth. This was
the only way I could actually get an fps of 30, which was all that was
needed as the cam only updates at 30fps.
Questions:
1) Why does pyglet draw at 60fps, regardless of whether I use
clock.set_fps_limit() ?
2) Why does pyglet flip() the window buffers when _any_ event happens
by default, even when that event doesn't alter the buffers? This
behavior means that scheduling any function to be called at short
intervals will push the fps to the maximum of 60, regardless of what
that function is doing, i.e. whether it has an effect on the buffers
or not. Not a criticism, just curious...
System was a windows XP machine with pyglet 1.1.2 on python 2.5.
-Padraig
On 26 Apr 2009, at 18:54, Tristam MacDonald wrote:
> I am trying to render at a (relatively) fixed frame-rate, using the
> standard app-loop and a scheduled update function ever 1/30.0 seconds.
>
> However, I am also tracking mouse motion for the user interaction,
> and it seems that every time a mouse event occurs, pyglet attempts
> to redraw the screen. Is there any way to disable this behaviour? It
> ends up pushing my frame rate too high, which results in a very
> choppy experience.
>
> --
> Tristam MacDonald
> http://swiftcoder.wordpress.com/
>
> >
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