Hi, anyone else noticed that the performance is terrible when resizing the window of the "OpenGL Window Example"? At least on OS X 10.9.4 (some older MacBook Pro 2010) and OS X 10.8.5 (iMac 2011). Both in debug and release mode.
When dragging the mouse the window reacts very sluggish: up to 1 second and more until the window changes its size (so it "lags behind mouse movements"). Note that the triangle itself rotates smoothly, so it appears that some timer is triggered when resizing the window, and the event is handled much much later - or whatever. What is even more odd, while the window resize doesn't happen, the triangle still continues to rotate smoothly! I have observed this behaviour in the past, but it is still there in the latest Qt 5.3.1. If this was just some random example, I wouldn't mind too much. However I am (once again ;)) jumping into the "Modern OpenGL with Qt" topic, and this example really seems to be the "entry point" for all those new QOpenGL* classes (most other Qt OpenGL examples still use the outdated QGL* classses and even worse: completely deprecated glRotate, glVertex and other functions which have been removed from modern OpenGL "core" context). The funny thing is: all other OpenGL related example programs - specifically "Scene Graph - OpenGL Under QML", which I guess uses the same new QOpenGL classes and is also QWindow based - do not have this odd "sluggish resize" behaviour: the window resizes immediatelly (smoothly following the mouse movements) and the content is redrawn instantaneously. I haven't examined the source code too much in detail, so I currently cannot tell from where this "sluggish resize behaviour" comes from (on Mac only?), but once I know more I'll post it here ;) In the meantime: anyone else has seen this behaviour? Possibly on non-Mac platforms, too? Cheers, Oliver _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
