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Hello,
sorry to pop-up my question, isn't there someone who has any idea
of how to fix/overcome this problem ?
I can try to patch this, but I want to be sure to understand why
it has been done like this before I break something :-[
Thanks,
Christian
Le 06/07/2015 10:05, Christian Schulte a écrit :
Hello everybody,
I'm trying to switch on or off the vsync on my NVidia K4200 on
Win7 64 bits by using traits->vsync and setting the NVidia
parameter to 'Use Application parameters" for the vsync.
Setting vsync to true, works, I can see the OSG_INFO
"GraphicsWindowWin32::setSyncToVBlank" as expected.
The problem is I cannot set it to false, because by default the
NVidia behaviour is vsync = true (i.e. if nothing is specified the
drivers choice is vsync=true).
After digging a little bit I've found in GraphicWindowWin32.cpp
GraphicsWindowWin32::realizeImplementation() that :
- vsync is only changed if it is true -> the
setSyncToVBlank(bool) is only called if the traits->vsync
is true, so you cannot change it to false.
- Removing the protection (if vsync equal true), the
setSyncToVBlank is not called either because it is in an if
condition depending on vsync equal true (if (_traits.valid()
&& (_traits->sharedContext.valid() ||
_traits->vsync || _traits->swapGroupEnabled)))
The question is why is there this double protection on the
vsync equal true ? Is there a risk that I don't understand (and
then please can someone explain
:-) ) about desactivating the vsync ?
Thanks a lot,
Christian
--
SCHULTE Christian
Ingénieur Recherche
Responsable du Laboratoire de Simulation
ONERA - DCSD/PSEV
Département Commande des Systèmes et Dynamique du Vol
ONERA - Centre de Salon de Provence
BA 701
13661 SALON AIR Cedex - France
Tel :04.90.17.01.45
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
SCHULTE Christian
Ingénieur Recherche
Responsable du Laboratoire de Simulation
ONERA - DCSD/PSEV
Département Commande des Systèmes et Dynamique du Vol
ONERA - Centre de Salon de Provence
BA 701
13661 SALON AIR Cedex - France
Tel :04.90.17.01.45
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