Hello, Yes, check the profile too. Additionally, starting from 5.3, we have a useful example in qtbase/examples/opengl/contextinfo that can be used to check what kind of context is returned for a given version, profile and options combination.
Gl_Widget glw; glw.show(); Here you are asking for OpenGL 2.0. You get a 4.4 compatibility profile context. This is just fine. The driver is free to give you 2.0, 2.1, or a compatibility profile of 3.2, 3.3, 4.x. fmt.setVersion(4, 4); fmt.setProfile(QGLFormat::CoreProfile); Here you are asking for 4.4 core profile and that's exactly what you are getting. Are the app's OpenGL shaders and calls prepared to handle core profile? fmt.setVersion(3, 3); fmt.setProfile(QGLFormat::CoreProfile); Similarly to the previous, you get 3.3 core. fmt.setVersion(2, 1); Again, it gives you 4.4 compatibility. fmt.setProfile(QGLFormat::CoreProfile); This is again 4.4 compatibility (not core) since you are requesting 2.0 core which does not make sense so the profile is ignored. Best regards, Laszlo ________________________________________ From: interest-bounces+laszlo.agocs=digia....@qt-project.org [interest-bounces+laszlo.agocs=digia....@qt-project.org] on behalf of Giuseppe D'Angelo [giuseppe.dang...@kdab.com] Sent: Thursday, July 24, 2014 2:49 PM To: interest@qt-project.org Subject: Re: [Interest] OpenGL weirdness Hello, Il 24/07/2014 14:13, Yves Bailly ha scritto: > Any idea about what's going on? The same thing occures on both MinGW (32bits) > and > Visual C++ 2012 (64bits). Can you also dump the context profile? Maybe unless you're requesting both a version >= 3.2 *and* a Core profile, then you're getting a Compatibility profile. Regards, -- Join us Oct 6-8 at BCC Berlin for Qt Developer Days 2014! Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Software Engineer KDAB (UK) Ltd., a KDAB Group company Tel. UK +44-1738-450410, Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-independent software solutions _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
