garden_client/Assets/Script/Tool/AtlasUtil/ExMath.cs

using UnityEngine;

using System.Collections;
using System.Collections.Generic;

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;
        }
    }
}