On Sunday 20 April 2014 02:50:50 Joshua Kolden wrote: > On Apr 20, 2014, at 1:39 AM, Sean Harmer <sean.har...@kdab.com> wrote: > > The swapInterval() mentioned by Laszlo combined with this controls the > > refresh rate in the common case. > > > > Setting swapInterval to: > > > > * 1 enforces vsync > > * 0 turns vsync off > > * -1 uses adaptive vsync (if framerate is > rfresh rate then use vsync. If > > framerate is < refresh rate do not wait for vsync). > > > > See http://www.opengl.org/wiki/Swap_Interval for more info. > > > > Of course all of this can be overriden by the user if they force some > > settings in the driver's control panel. > > That’s interesting. That’s almost exactly the opposite of the way I’d > expect it to work (i.e. default to card / app can override). So what’s the > default setting? That link doesn’t seem to say.
As Laszlo mentioned, Qt defaults to using vsync. But the driver settings can override this. It works like this as some people like to force (no) vsync in games even if the game doesn't offer such a setting. Within Qt you should have vsync working, if it is not check the driver settings. If you want to turn vsync off within Qt then QSurfaceFormat::setSwapInterval(0) should do it. Of course where you use this depends upon your particular application. If it's for a QQ2 app then create a surface format including the above setting and call setFormat() on the QQuickView. Cheers, Sean > > Cheers, > > > > Sean > > > > -- > > Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK > > Klarälvdalens Datakonsult AB, a KDAB Group company > > Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) > > KDAB - Qt Experts - Platform-independent software solutions > > _______________________________________________ > > Interest mailing list > > Interest@qt-project.org > > http://lists.qt-project.org/mailman/listinfo/interest -- Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts - Platform-independent software solutions _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
