num npo2(num x)
num - any numeric type (int or fixed)
Returns x rounded up to the the Next Power Of 2. The input must be positive.
If x is a power of 2, x is unchanged.
npo2(16) -> 16 npo2(17) -> 32 npo2(6.5) -> 8.0 npo2(8.0) -> 8.0