] On 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 double
...@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 vsync (UNCLASSIFIED)
The sync blocks on a swap buffers call, not on the first
OpenGL call
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
] OSG and vsync (UNCLASSIFIED)
Message-ID: 4c5c2991.1000...@ist.ucf.edu
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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
,
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 buffering
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 and vsync (UNCLASSIFIED)
Classification
-users@lists.openscenegraph.org
Subject: Re: [osg-users] OSG and vsync (UNCLASSIFIED)
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
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)
So
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
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
...@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 even
after
your sync
-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
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 even
after
your sync you won't see the image you
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
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