garden_client/Assets/AtlasUtility/Script/Extension/ExMath.cs

namespace AtlasUtility
{
    using UnityEngine;

    public static class ExMath
    {
        public static int PrevPOT(int value)
        {
            int closestPOT = Mathf.ClosestPowerOfTwo(value);

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

        public static int NextPOT(int value)
        {
            int closestPOT = Mathf.ClosestPowerOfTwo(value);

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