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Assets/Oculus/Interaction/Runtime/Scripts/Utils/MonoBehaviourEndOfFrameExtensions.cs

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * Licensed under the Oculus SDK License Agreement (the "License");
+ * you may not use the Oculus SDK except in compliance with the License,
+ * which is provided at the time of installation or download, or which
+ * otherwise accompanies this software in either electronic or hard copy form.
+ *
+ * You may obtain a copy of the License at
+ *
+ * https://developer.oculus.com/licenses/oculussdk/
+ *
+ * Unless required by applicable law or agreed to in writing, the Oculus SDK
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Oculus.Interaction
+{
+    /// <summary>
+    /// This extension allows easily registering an unregistering callback at the EndOfFrame
+    /// which happens after rendering but before the next fixed Update.
+    /// Call RegisterEndOfFrameCallback to start receiving updates and
+    /// UnregisterEndOfFrameCallback to stop.
+    /// </summary>
+    internal static class MonoBehaviourEndOfFrameExtensions
+    {
+        private static YieldInstruction _endOfFrame = new WaitForEndOfFrame();
+        private static Dictionary<MonoBehaviour, Coroutine> _routines = new Dictionary<MonoBehaviour, Coroutine>();
+
+        internal static void RegisterEndOfFrameCallback(this MonoBehaviour monoBehaviour, Action callback)
+        {
+            if (_routines.ContainsKey(monoBehaviour))
+            {
+                throw new ArgumentException("This MonoBehaviour is already registered for the EndOfFrameCallback");
+            }
+
+            Coroutine routine = monoBehaviour.StartCoroutine(EndOfFrameCoroutine(callback));
+            _routines.Add(monoBehaviour, routine);
+        }
+
+        internal static void UnregisterEndOfFrameCallback(this MonoBehaviour monoBehaviour)
+        {
+            if (!_routines.ContainsKey(monoBehaviour))
+            {
+                throw new ArgumentException("This MonoBehaviour is not registered for the EndOfFrameCallback");
+            }
+            monoBehaviour.StopCoroutine(_routines[monoBehaviour]);
+            _routines.Remove(monoBehaviour);
+        }
+
+        private static IEnumerator EndOfFrameCoroutine(Action callback)
+        {
+            while (true)
+            {
+                yield return _endOfFrame;
+                callback.Invoke();
+            }
+        }
+    }
+}