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/PerfItem.cs

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+#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.Collections.Generic;
+using OpenRA.Primitives;
+
+namespace OpenRA.Support
+{
+	public class PerfItem
+	{
+		public readonly Color C;
+		public readonly string Name;
+		readonly double[] samples = new double[100];
+		public double Val = 0.0;
+		int head = 1, tail = 0;
+		public bool HasNormalTick = true;
+
+		public PerfItem(string name, Color c)
+		{
+			Name = name;
+			C = c;
+		}
+
+		public void Tick()
+		{
+			samples[head++] = Val;
+			if (head == samples.Length) head = 0;
+			if (head == tail && ++tail == samples.Length) tail = 0;
+			Val = 0.0;
+		}
+
+		public IEnumerable<double> Samples()
+		{
+			var n = head;
+			while (n != tail)
+			{
+				--n;
+				if (n < 0) n = samples.Length - 1;
+				yield return samples[n];
+			}
+		}
+
+		public double Average(int count)
+		{
+			var i = 0;
+			var n = head;
+			double sum = 0;
+			while (i < count && n != tail)
+			{
+				if (--n < 0) n = samples.Length - 1;
+				sum += samples[n];
+				i++;
+			}
+
+			return i == 0 ? sum : sum / i;
+		}
+
+		public double LastValue
+		{
+			get
+			{
+				var n = head;
+				if (--n < 0) n = samples.Length - 1;
+				return samples[n];
+			}
+		}
+
+		public void ResetSamples()
+		{
+			head = 1;
+			tail = 0;
+			Val = 0.0;
+		}
+	}
+}