Has anything ever come of this?
I am struggling with lack of "swap grouping" support on my HP/dual-
nvidia cards with a gsync board.
My OpenGL apps are much better with swap groups enabled (NVIDIA glX
calls),
but my OSG apps look bad with nothing being done.
I was just about to hack my own OSG code, but saw this thread.
I can certainly do some testing if that is required..
ml
On Apr 15, 2008, at 3:17 AM, Robert Osfield wrote:
Hi Roland,
Thanks for the submission. I've just reviewed it, but won't merge
anything yet. What I may do is merge parts of your changes, such
as the extensions support.
The API parts will need further thought/discussion, items such as
hardwiring the swap group id and swap barrier id to 1 is items that
will obviously have to change. It might be that we just provide a
public function for joining swap group and swap barrier, although
it might just be more robust to set these up in the init (this way
we avoid threading issues), and use extra parameters in Traits
structure to control the source group and barrier ID's.
W.r.t compatibility with SGI's swap group/barrier functionality
under X11, I wonder if this could be either ignored as the
associated hardware/drivers have fallen off the product support at
SGI, or emulate the newer NVidia swap group functions at the
GraphicsWindow API level, but internally use the SGIX extensions.
Robert.
On Tue, Apr 15, 2008 at 8:58 AM, Smeenk, R.J.M. (Roland)
<[EMAIL PROTECTED]> wrote:
Hi Robert,
we've been looking at clustering too. I've added the extension
querying to the GraphicsWindowWin32 and GraphicsWindowX11 and a
joinSwapGroup method to the GraphicsWindow.
I had this code waiting for submission for a few weeks now, but due
to this thread I feel urged to get the code out first.
We still need to test our cluster properly (on Linux) and will
probably be doing this in the coming weeks.
Changes were done against OSG2.2.
kind regards,
Roland Smeenk
From: [EMAIL PROTECTED] [mailto:osg-users-
[EMAIL PROTECTED] On Behalf Of Robert Osfield
Sent: maandag 14 april 2008 11:40
To: OpenSceneGraph Users
Subject: [osg-users] Feedback sought on osgViewer swap ready
support forclusters
Hi All,
I'm looking for feedback from users who have worked on clusters
that implement some forms of swap ready synchronization. In
particular I'm looking at any hooks into osgViewer to allow users
to implement their own swap ready implementation, also a software
based swap ready could possibly be implemented as part of the core
OSG as well.
The hook to adding a swap ready barrier into the view would look
something like:
viewer.setSwapReadyOperation(myCustomSwapReadyOperation);
Something like complicates the mater is that viewer on each slave
of the cluster might have more than one graphics context that its
rendering too, so in this case we'll have multiple graphics threads
per slave, in which case these threads will need to join a barrier
that treats each context like a separate machine or the barrier
does a local synchronization of the threads on a machine before
joining the cluster swap ready barrier.
I want to come up with a scheme that supports both ways above, but
really need a bit more feedback on what goes into users own swap
ready codes, i.e. what would your MyCustomSwapReadyOperation look
like, i.e. what does it look right now, this will help me better
understand how the most appropriate integration into osgViewer
could be done.
Robert.
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