Il 19/09/2018 15:02, Andy ha scritto:
Any thoughts on the second part about why I get a 3.0 context if I try to set samples instead of the 3.3 I get when I don't? On macOS if I request 16 samples, and it can only do 8, I get 8.
That now boils down to how the different integration layers (GLX, CGL, WGL, EGL) implement these fallbacks, both internally as well as in Qt itself.
(Yes, it's a huge, unpleasant mess where both the underlying levels try to be "too smart", and implement various fallback strategies. Thus Sean's suggestion of try, check if you like what you get back, if not try again with different parameters.)
So, it could just be that Qt+CGL accept the context version and other parameters but simply reduce the number of samples, while Qt+GLX (+ Mesa) do something entirely different. In either case you need to create a context/window and check that what you've got is OK for you.
HTH, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts
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