Adaug proiectul Unity

Library/PackageCache/com.unity.render-pipelines.core@13460d8ea9e5/Runtime/XR/XRLayoutStack.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine.Pool;
+
+namespace UnityEngine.Experimental.Rendering
+{
+    internal class XRLayoutStack : IDisposable
+    {
+        readonly Stack<XRLayout> m_Stack = new ();
+
+        public XRLayout New()
+        {
+            GenericPool<XRLayout>.Get(out var layout);
+            m_Stack.Push(layout);
+            return layout;
+        }
+
+        public bool hasLayout => m_Stack.Count > 0;
+
+        public XRLayout top => m_Stack.Peek();
+
+        public void Release()
+        {
+            if (!m_Stack.TryPop(out var value))
+                throw new InvalidOperationException($"Calling {nameof(Release)} without calling {nameof(New)} first.");
+
+            value.Clear();
+            GenericPool<XRLayout>.Release(value);
+        }
+
+        public void Dispose()
+        {
+            if (m_Stack.Count != 0)
+                throw new Exception($"Stack is not empty. Did you skip a call to {nameof(Release)}?");
+        }
+    }
+}