Check if the next frame is due

[GoldenretriverYT]

Unlike with mfb_wait_sync, I do not want the thread to stall until the next frame is due but I want to execute code in between, if there is still time to do so. I would appreciate a way do to so, maybe even with an argument to check the future (like mfb_frame_is_due_in(nanoseconds)

If there already is a way to due so, please tell me. If there isnt, this is a feature suggestion (:

[austanss]

I also believe this would be useful to implement.

Consider a use case where there is some sort of logic being calculated iteratively in a loop. If some representation of this logic is ought to be rendered in a MiniFB window, then its tick-rate is locked to match the framerate of the window.

The only workaround to this issue is to, in the aformentioned scenario, have the miniFB window's update logic running in a separate thread than that of the physical logic. However, then you have to work around the logistics of thread affinity.