public static int GetFretInputMask(this GamepadInput gamepad)
{
int inputMask = 0;
foreach (Note.GuitarFret fret in System.Enum.GetValues(typeof(Note.GuitarFret)))
{
if (gamepad.GetFretInput(fret))
{
inputMask |= 1 << (int)fret;
}
}
return(inputMask);
}