添加一些单例系统，材质方法

Runtime/MicroLibrary/MacroMath.cs

@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 
 using UnityEngine;
+using UnityEngine.Windows;
 
 namespace XericLibrary.Runtime.MacroLibrary
 {
@@ -50,6 +51,21 @@ namespace XericLibrary.Runtime.MacroLibrary
 
 		#region 数学
 
+		/// <summary>
+		/// pmod
+		/// </summary>
+		/// <param name="a"></param>
+		/// <param name="b"></param>
+		/// <returns></returns>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static int PMod(int a, int b)
+		{
+			if(b <= 0)
+				return 0;
+			var mod = a % b;
+			return a < 0 ? (b + mod) % b : mod;
+		}
+
 		/// <summary>
 		/// pmod
 		/// </summary>