On Fri, Oct 18, 2019 at 11:47 AM Giuseppe D'Angelo via Interest < [email protected]> wrote:
> Il 18/10/19 11:28, Thomas Sevaldrud ha scritto: > > > I doesn't actually appear to have any negative consequences. Everything > > works as before, but our users are complaining about the warning :) > > > > The reason that these attributes are set after creating the QApplication > > is that I have a fallback system where I can try for software rendering > > if the ANGLE setup fails for some reason (crappy drivers, etc). So if my > > GLContext with AA_UseOpenGLES fails, I try again with > > AA_UseSoftwareOpenGL. This also appears to work nicely. > > The principle is that once Qt "thinks" you are using Desktop GL, setting > that attribute may or may not make it switch over to ANGLE, and vice > versa. In other words there comes a point in time after which setting > the attribute becomes meaningless (in the specific case: typically after > the first GL context has been created, but this is undocumented and > should not be relied upon). > OK, in my case I switch these settings to software if the GLContext::create() call fails, so I guess that's why it works. I understand that I can't rely upon it working in the future though :-) What Qt is warning about is that you're touching a setting that may or > may not have any effect (depending on the OS, what you did so far in the > application, which modules of Qt you're using, the day of the week, the > moon phase), so don't it. > > What you could maybe do is to create a Q(Gui)Application, do your tests > to detect which GL way to use, and if you need to switch to ANGLE or > software then > > 1) destroy the QGuiApplication object > 2) set all the attributes you need > 3) create QGuiApplication again and proceed > > (Or, similarly: save some settings and restart the application with the > new settings) > Then I think I'll try deleting and recreating the GuiApplication. Thanks so much for your help! - Thomas
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