[osg-users] Strange behavior with multiple screens and ImageStream
Kawicki, Ryan H
Ryan.H.Kawicki at boeing.com
Thu Sep 11 07:18:22 PDT 2008
I am not an expert in this area, but our application seems to suffer
from this as well. I don't think this has to do with OSG. I believe it
to be more driver related.
Do you have VSync turned on? If you do, force VSync to be always off
Ryan H. Kawicki
The Boeing Company
Training Systems & Services
From: Serge Lages [mailto:serge.lages at gmail.com]
Sent: Thursday, September 11, 2008 4:53 AM
To: OpenSceneGraph Users
Subject: [osg-users] Strange behavior with multiple screens and
We've made an ImageStream using FFmpeg to display movies on textures,
but I am currently facing some problem when displaying this movie on two
different contexts. Here is my setup :
WinXP with one GForce 8600GTS and 2 screens, viewer on
DrawThreadPerContext mode (OSG SVN head version).
When I only have one screen but two windows (with a different context
per window), everything works fine, the movie is displayed on the 2
windows without any problem. When I plug a second screen, and I keep the
same setup (2 windows rendered into the first screen), I have a huge
frame drop (more than 20 fps) when rendering my movie (note that in this
configuration, nothing is displayed on the second screen). Same thing
happens if I use the 2 screens (with each window in full screen mode on
I really don't understand why adding a new screens make this difference,
moreover it's the only thing in my application that suffer like that
from the second screen. Does it ring a bell to someone ?
Thanks in advance !
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