[Interest] OpenGL: Setting samples on default QSurfaceFormat

[Andy]

I seem to have a catch-22.

- QSurfaceFormat::setDefaultFormat() needs to be called before application
construction.

- I want multisampling on a 3.3 context by default, so I need to call
QSurfaceFormat::setSamples().

- I can't know how many samples are supported until after application
construction by actually creating a context and asking how many it
supports. (Or can I somehow?)

- If I just setSamples() to the number I want (8) and call
setDefaultFormat, then any card/driver that doesn't support that many
samples fails to be created and I end up with a 2.0 default context.

Any ideas?

---
Andy Maloney  //  https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>
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