Re: [Freeglut-developer] Event queue problem

[Fay, J. F Dr C. U. A. 46 S. <joh...@eg...>]

Rolf,

	First, I would encourage you to try again with the latest SVN
version of "freeglut".  There have been a lot of changes made since the
2.4.0 release, although I do not know that anything has changed that
will fix your problem.

	What you are describing sounds reasonable to the extent that if
you have a computer do a lot of stuff, performance is likely to suffer.
The function "glutMainLoop" is found in "freeglut_main.c" starting on
line 1451 and it calls "glutMainLoopEvent" which starts on line 951 of
the same file. 
 Within the latter function there is a while loop (starting on line 969
for
X11 and on line 1419 for Windows) that continues to handle events as
long as the operating system continues to send them.  This would explain
the pause in rendering if the event queues were flooded, but it doesn't
explain why the flooding would occur.

	My first course of action would be to stick a "fprintf"
statement in at the beginning of the while-loop to see whether the queue
is actually being flooded, and if so with what.

		- John

(originally sent from home on Sat 3/7/2009 6:52 PM)

John F. Fay
Technical Fellow
Jacobs Technology TEAS Group
850-883-1294 
-----Original Message-----
From: Rolf Schneider [mailto:ro...@sc...] 
Sent: Monday, March 09, 2009 5:55 AM
To: FreeGLUT developers list
Subject: Re: [Freeglut-developer] Event queue problem

Hmm... has no one an idea what could be going on, here?

	R.


Rolf Schneider wrote:
> Hi!
> 
> there seems to be a problem with FreeGLUT's event queue.
> 
> We've developed a large application with a comprehensive GUI. In fact,
> we developed an object oriented user interface kit featuring all kinds
> of components (buttons, toggles, slider, menus, forms, panes, etc.)
> which is entirely based on OpenGL/FreeGLUT...
> 
> It runs under Linux, Mac & Windows and the performance so far is
great!
> 
> The problem is, as soon as our app must perform some complex tasks
> (rendering 1000s of points/lines/polygons, glDrawPixels of highres
> images >3k, doing some intensive background computations) while we
feed
> events into the queue using the mouse, the window rendering "hangs"
for
> a short moment. This does *not* happen, if we simply refresh the
window
> display without feeding event into the queue (e.g. playback a sequence
> of frames).
> 
> It seems that if the event queue becomes "flooded" with too many
events,
> it skips rendering until the queue is has been "flushed" again.
> 
> We see this behavior on all platforms!
> 
> Does this make sense to you? ...or does it sound familiar?
> 
> FYI, we use a modified version of FreeGLUT 2.4...
> 
> Any help would be great!
> 
> Thanks a lot,
> 
> 	Rolf
> 
> 


-- 
S c i e n c e . D . V i s i o n s

Heiliger Weg 60
44135 Dortmund
Germany

phone +49.231.1675.450
fax   +49.231.1675.451

------------------------------------------------------------------------
------
Open Source Business Conference (OSBC), March 24-25, 2009, San
Francisco, CA
-OSBC tackles the biggest issue in open source: Open Sourcing the
Enterprise
-Strategies to boost innovation and cut costs with open source
participation
-Receive a $600 discount off the registration fee with the source code:
SFAD
http://p.sf.net/sfu/XcvMzF8H
_______________________________________________
Freeglut-developer mailing list
Fre...@li...
https://lists.sourceforge.net/lists/listinfo/freeglut-developer