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/Map/ProjectedCellLayer.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;
+using OpenRA.Primitives;
+
+namespace OpenRA
+{
+	public sealed class ProjectedCellLayer<T> : CellLayerBase<T>
+	{
+		public int MaxIndex => Size.Width * Size.Height;
+
+		public ProjectedCellLayer(Map map)
+			: base(map) { }
+
+		public ProjectedCellLayer(MapGridType gridType, Size size)
+			: base(gridType, size) { }
+
+		// Resolve an array index from map coordinates.
+		public int Index(PPos uv)
+		{
+			return uv.V * Size.Width + uv.U;
+		}
+
+		public PPos PPosFromIndex(int index)
+		{
+			return new PPos(index % Size.Width, index / Size.Width);
+		}
+
+		public T this[int index]
+		{
+			get => Entries[index];
+
+			set => Entries[index] = value;
+		}
+
+		/// <summary>Gets or sets the layer contents using projected map coordinates.</summary>
+		public T this[PPos uv]
+		{
+			get => Entries[Index(uv)];
+
+			set => Entries[Index(uv)] = value;
+		}
+
+		public bool Contains(PPos uv)
+		{
+			return Bounds.Contains(uv.U, uv.V);
+		}
+
+		public int IndexOf(T value, int startIndex)
+		{
+			return Array.IndexOf(Entries, value, startIndex);
+		}
+
+		public void SetAll(T value)
+		{
+			Array.Fill(Entries, value);
+		}
+	}
+}