Behalf Of Bunfield,
Dennis AMRDEC/AEgis
Sent: Monday, June 28, 2010 12:39 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: FOUO
Yes we found this through internal testing. Nvidia later confirmed it.
This isn't related to doub
,
Dennis AMRDEC/AEgis
Sent: Monday, June 28, 2010 12:39 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: FOUO
Yes we found this through internal testing. Nvidia later confirmed it.
This isn't related to double or triple buff
It
rocks. (Just so you know, I don't work for digitalversus.com or
Dell).
--
Terry Welsh
mogumbo 'at' gmail.com
www.reallyslick.com
>
> Message: 4
> Date: Fri, 6 Aug 2010 11:26:09 -0400
> From: Jason Daly
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] OSG a
Middleton, Colin (GE Intelligent Platforms) wrote:
PS I've only tested 7600 and 9400 properly, but I've seen symptoms of
latency on GeForce 8 series cards too. I think Geforce 5 and 6 didn't
have this 'feature' though. Interestingly, I also found that there were
some monitors that had over 66 mil
ncy.
> -Original Message-
> From: osg-users-boun...@lists.openscenegraph.org
> [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf
> Of Buckley, Bob CTR MDA/DES
> Sent: 06 August 2010 00:15
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] OSG and v
Users
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
My own research indicates that the timing rules are:
The first opengl call will block if the back buffer is not available at that
point.
The swapbuffers will block if there is already a pending swap queued (by the
last call to swapbuffers
ginal Message-
> From: osg-users-boun...@lists.openscenegraph.org
> [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Bunfield,
> Dennis AMRDEC/AEgis
> Sent: Wednesday, June 23, 2010 4:35 PM
> To: osg-users@lists.openscenegraph.org
> Subject: Re: [osg-users] OSG
he hell wouldn't let 'em!
Bob
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Bunfield,
Dennis AMRDEC/AEgis
Sent: Wednesday, June 23, 2010 4:35 PM
To: osg-users@lists.openscenegraph.org
Subject: Re: [
-users-boun...@lists.openscenegraph.org
> [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Bruce
> Wheaton
> Sent: Monday, June 28, 2010 12:46 PM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
>
> On Jun 23, 2010, at 3:35 PM,
-users-boun...@lists.openscenegraph.org] On Behalf Of
Bunfield, Dennis AMRDEC/AEgis
Sent: Monday, June 28, 2010 1:39 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: FOUO
Yes we found this through internal testing. Nvidia later
ailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Bruce
Wheaton
Sent: Monday, June 28, 2010 12:46 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
On Jun 23, 2010, at 3:35 PM, Bunfield, Dennis AMRDEC/AEgis wrote:
> For Nvidia cards there is a built in 2 frames of latency. So
On Jun 23, 2010, at 3:35 PM, Bunfield, Dennis AMRDEC/AEgis wrote:
> For Nvidia cards there is a built in 2 frames of latency. So even after
> your sync you won't see the image you updated come out the DVI until 2
> render frames later.
Where does this information come from Dennis? Where is this
Classification: UNCLASSIFIED
Caveats: FOUO
Nvidia chips use a very long pipeline and the GPU's like processing
data. When they are not processing data they have a hard time
performing. In order to keep the performance up, NVIDIA introduces the
2 frames latency to keep the pipeline full. Most li
Classification: UNCLASSIFIED
Caveats: FOUO
The sync actually blocks on the first open gl call. So your osg update
and cull stages will run then you will block on the draw stage until the
vsync. Your problem is actually worse than 20ms w/o you knowing it.
For Nvidia cards there is a built in 2 fr
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