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.Platforms.Default/DefaultPlatform.cs

@@ -0,0 +1,44 @@
+#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.Platforms.Default
+{
+	public class DefaultPlatform : IPlatform
+	{
+		public IPlatformWindow CreateWindow(
+			Size size, WindowMode windowMode, float scaleModifier, int vertexBatchSize, int indexBatchSize, int videoDisplay, GLProfile profile)
+		{
+			return new Sdl2PlatformWindow(size, windowMode, scaleModifier, vertexBatchSize, indexBatchSize, videoDisplay, profile);
+		}
+
+		public ISoundEngine CreateSound(string device)
+		{
+			try
+			{
+				return new OpenAlSoundEngine(device);
+			}
+			catch (InvalidOperationException e)
+			{
+				Log.Write("sound", "Failed to initialize OpenAL device. Error was");
+				Log.Write("sound", e);
+				return new DummySoundEngine();
+			}
+		}
+
+		public IFont CreateFont(byte[] data)
+		{
+			return new FreeTypeFont(data);
+		}
+	}
+}