As an option to display the user interface above the game I'm currently developing, I was thinking about how viable QML (Qt5) will be. Given that you are only limited to drawing, when Qt gives you a signal how viable it will be to write a game, for example; first-person shooter on quality say ... ArmA 3 (graphically wise, not considering content creation or budget); be in Qt / QML on a desktop platform if you used QML for only a 2D interface on top of the game (think of the menu and HUD)?
To be more specific, what kind of performance loss will you get by providing a high-quality FPS game like this and then rendering the interface it uses QML?
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