initial upload

Unity-Master/Assets/Plugins/RootMotion/Shared Scripts/LayerMaskExtensions.cs

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+using UnityEngine;
+using System.Collections.Generic;
+
+namespace RootMotion {
+
+	/// <summary>
+	/// This class contains tools for working with LayerMasks. 
+	/// Most of this was copied from Unity Wiki: http://wiki.unity3d.com/index.php?title=LayerMaskExtensions.
+	/// </summary>
+	public static class LayerMaskExtensions
+	{
+		/// <summary>
+		/// Does the LayerMask contain a specific layer index?
+		/// </summary>
+		public static bool Contains(LayerMask mask, int layer) {
+			return mask == (mask | (1 << layer));
+		}
+
+		/// <summary>
+		/// Creates a LayerMask from an array of layer names.
+		/// </summary>
+		public static LayerMask Create(params string[] layerNames)
+		{
+			return NamesToMask(layerNames);
+		}
+
+		/// <summary>
+		/// Creates a LayerMask from an array of layer indexes.
+		/// </summary>
+		public static LayerMask Create(params int[] layerNumbers)
+		{
+			return LayerNumbersToMask(layerNumbers);
+		}
+
+		/// <summary>
+		/// Creates a LayerMask from a number of layer names.
+		/// </summary>
+		public static LayerMask NamesToMask(params string[] layerNames)
+		{
+			LayerMask ret = (LayerMask)0;
+			foreach(var name in layerNames)
+			{
+				ret |= (1 << LayerMask.NameToLayer(name));
+			}
+			return ret;
+		}
+
+		/// <summary>
+		/// Creates a LayerMask from a number of layer indexes.
+		/// </summary>
+		public static LayerMask LayerNumbersToMask(params int[] layerNumbers)
+		{
+			LayerMask ret = (LayerMask)0;
+			foreach(var layer in layerNumbers)
+			{
+				ret |= (1 << layer);
+			}
+			return ret;
+		}
+
+		/// <summary>
+		/// Inverts a LayerMask.
+		/// </summary>
+		public static LayerMask Inverse(this LayerMask original)
+		{
+			return ~original;
+		}
+
+		/// <summary>
+		/// Adds a number of layer names to an existing LayerMask.
+		/// </summary>
+		public static LayerMask AddToMask(this LayerMask original, params string[] layerNames)
+		{
+			return original | NamesToMask(layerNames);
+		}
+
+		/// <summary>
+		/// Removes a number of layer names from an existing LayerMask.
+		/// </summary>
+		public static LayerMask RemoveFromMask(this LayerMask original, params string[] layerNames)
+		{
+			LayerMask invertedOriginal = ~original;
+			return ~(invertedOriginal | NamesToMask(layerNames));
+		}
+
+		/// <summary>
+		/// Returns a string array of layer names from a LayerMask.
+		/// </summary>
+		public static string[] MaskToNames(this LayerMask original)
+		{
+			var output = new List<string>();
+			
+			for (int i = 0; i < 32; ++i)
+			{
+				int shifted = 1 << i;
+				if ((original & shifted) == shifted)
+				{
+					string layerName = LayerMask.LayerToName(i);
+					if (!string.IsNullOrEmpty(layerName))
+					{
+						output.Add(layerName);
+					}
+				}
+			}
+			return output.ToArray();
+		}
+
+		/// <summary>
+		/// Returns an array of layer indexes from a LayerMask.
+		/// </summary>
+		public static int[] MaskToNumbers(this LayerMask original)
+		{
+			var output = new List<int>();
+			
+			for (int i = 0; i < 32; ++i)
+			{
+				int shifted = 1 << i;
+				if ((original & shifted) == shifted)
+				{
+					output.Add(i);
+				}
+			}
+			return output.ToArray();
+		}
+
+		/// <summary>
+		/// Parses a LayerMask to a string.
+		/// </summary>
+		public static string MaskToString(this LayerMask original)
+		{
+			return MaskToString(original, ", ");
+		}
+
+		/// <summary>
+		/// Parses a LayerMask to a string using the specified delimiter.
+		/// </summary>
+		public static string MaskToString(this LayerMask original, string delimiter)
+		{
+			return string.Join(delimiter, MaskToNames(original));
+		}
+	}
+}