garden_client/Assets/AtlasUtility/Script/ExMath.cs

namespace AtlasUtility
{
    using UnityEngine;

    public static class ExMath
    {
        public static int PrevPOT(float value)
        {
            int result = Mathf.ClosestPowerOfTwo(Mathf.CeilToInt(value));

            if (result > value)
            {
                return result/2;
            }
            else
            {
                return result;
            }
        }

        public static int NextPOT(float value)
        {
            int result = Mathf.ClosestPowerOfTwo(Mathf.CeilToInt(value));

            if (result >= value)
            {
                return result;
            }
            else
            {
                return result*2;
            }
        }
    }
}