Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Game/Support/PerfSample.cs

@@ -0,0 +1,33 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Diagnostics;
+
+namespace OpenRA.Support
+{
+	public readonly struct PerfSample : IDisposable
+	{
+		readonly string item;
+		readonly long ticks;
+
+		public PerfSample(string item)
+		{
+			this.item = item;
+			ticks = Stopwatch.GetTimestamp();
+		}
+
+		public void Dispose()
+		{
+			PerfHistory.Increment(item, 1000.0 * Math.Max(0, Stopwatch.GetTimestamp() - ticks) / Stopwatch.Frequency);
+		}
+	}
+}