One extra note for adventurous types:
SWAP_UNDEFINED option currently exits the osgviewer (at least on my NVidia).
Its normal behaviour because NVidia driver does not support UNDEFINED option
and matching PixelFormat cannot be found. So the viewer exits.
Wojtek
From: Wojciech Lewandowski
Sent: Thursday, October 07, 2010 11:49 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Workaround for nVidia + fullscreen + Windows 7
Hi Everyone,
Big Thanks to Farshid for the solution :-)
Support for his workaround, to use Copy as a swap Method, was recently included
in OSG trunk.
SwapCopy is not active by default - people not using Aero should be still happy
with default SwapExchange.
These who would like to activate the SwapCopy method can use environment
variables or osgViewer command line arguments ( provided they use Viewer(
ArgumentParser ) ctor ).
env var method:
set OSG_SWAP_METHOD=COPY
command line method:
osgviewer --swap-method COPY
Inside the code one can select swap method for a particular window via
GraphicsContext::Traits or for all windows by changing the default set in
DisplaySettings. Traits default to method set in DisplaySettings.
DisplaySettings use whats set by env var or command line. If no option is
given DEFAULT is used. I hope such solution is fairly complete and covers all
possible use cases.
All 4 allowed swap method options are:
SWAP_EXCHANGE - flip back & front buffers
SWAP_COPY - copy contents of back buffer into front buffer
SWAP_UNDEFINED - move contents of back buffer into front buffer, leaving back
buffer contents undefined
SWAP_DEFAULT - let the driver select the method (in my observation NVidia
drivers on Win7 defaults to EXCHANGE)
Cheers,
Wojtek Lewandowski
From: Wojciech Lewandowski
Sent: Monday, September 27, 2010 2:31 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Workaround for nVidia + fullscreen + Windows 7
Hi,
I have submitted code changes. Look at osg-submissions for details.
Wojtek Lewandowski
From: Wojciech Lewandowski
Sent: Friday, September 24, 2010 9:44 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Workaround for nVidia + fullscreen + Windows 7
Hi,
Exactly as Farshid Said I have modified PreparePixelFormatSpecification
function in GraphicsWindowWin32.cpp to test the workaround. Interestingly
PreparePixelFormatSpecification has a input allowSwapExchangeARB parameter as
if someone had similar problem before. But this parameter is used when function
is called but not influenced directly by GraphicContext::Traits. In my opinion
the best option would be expose Swap method in the GraphicContext::Traits.
I may try to come up with a patch on monday. Anyone to beat me on this ;-) ?
Wojtek
From: Farshid Lashkari
Sent: Friday, September 24, 2010 6:40 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Workaround for nVidia + fullscreen + Windows 7
Hi Robert,
On Fri, Sep 24, 2010 at 9:28 AM, Robert Osfield <[email protected]>
wrote:
Did you modify the OSG to achieve this? If so could you post the
changes. Perhaps this could be made as an runtime option in
osgViewer.
My application handles all the windowing code itself, so I didn't need to make
any changes to OSG.
I noticed that GraphicsWindowWin32.cpp hard codes the swap method to
WGL_SWAP_EXCHANGE_ARB. To apply this workaround the users would just need to
change this to WGL_SWAP_COPY_ARB and recompile. Having this configurable would
be ideal, however I'm not very familiar with osgViewer, so I'm probably not the
best person to make this change, otherwise I would have already submitted a
patch ;)
Cheers,
Farshid
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