LayerMask.cs

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using System;
using System.Collections;
using System.Runtime.CompilerServices;
 
namespace FalcoEngine
{
    public class LayerMask
    {
        private BitArray bitset = new BitArray(32, true);
 
        private static readonly LayerMask all = new LayerMask();
 
        public static LayerMask All => all;
 
        [MethodImpl(MethodImplOptions.InternalCall)]
        public static extern string LayerToName(int layer);
 
        [MethodImpl(MethodImplOptions.InternalCall)]
        public static extern int NameToLayer(string name);
 
        public void Set(int layer, bool value)
        {
            if (layer < bitset.Count)
                bitset.Set(layer, value);
        }
 
        public bool Get(int layer)
        {
            if (layer < bitset.Count)
                return bitset.Get(layer);
            else
                return false;
        }
 
        public ulong ToULong()
        {
            var array = new byte[32];
            bitset.CopyTo(array, 0);
 
            return BitConverter.ToUInt64(array, 0);
        }
 
        public void FromULong(ulong value)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            bitset = new BitArray(bytes);
        }
    }
}