1 files changed, 50 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/ClipperRegistry.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/ClipperRegistry.cs
new file mode 100644
index 0000000..ea7f527
--- /dev/null
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/ClipperRegistry.cs
@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using UnityEngine.UI.Collections;
+
+namespace UnityEngine.UI
+{
+    public class ClipperRegistry
+    {
+        static ClipperRegistry s_Instance;
+
+        readonly IndexedSet<IClipper> m_Clippers = new IndexedSet<IClipper>();
+
+        protected ClipperRegistry()
+        {
+            // This is needed for AOT platforms. Without it the compile doesn't get the definition of the Dictionarys
+#pragma warning disable 168
+            Dictionary<IClipper, int> emptyIClipperDic;
+#pragma warning restore 168
+        }
+
+        public static ClipperRegistry instance
+        {
+            get
+            {
+                if (s_Instance == null)
+                    s_Instance = new ClipperRegistry();
+                return s_Instance;
+            }
+        }
+
+        public void Cull()
+        {
+            for (var i = 0; i < m_Clippers.Count; ++i)
+            {
+                m_Clippers[i].PerformClipping();
+            }
+        }
+
+        public static void Register(IClipper c)
+        {
+            if (c == null)
+                return;
+            instance.m_Clippers.AddUnique(c);
+        }
+
+        public static void Unregister(IClipper c)
+        {
+            instance.m_Clippers.Remove(c);
+        }
+    }
+}