min(val1, val2, ... val15);
|val0 ... val15||The values to compare.|
This function returns the minimum of the input values, of which
it can have up to 16. For example min(12, 96, 32, 75) will
return 12 as that is the lowest of all the input values.
x = min(x, room_width);
This will stop the player from exiting the right of the room. This works by constantly setting its x to either itself or the room_width variable, whichever is smaller. If the player exits the right, its x would be larger than room_width, so it'll get set straight back.