untie the engine from SDL2 and MiniTK

OpenRA.Platforms.Default/DefaultPlatform.cs

@@ -0,0 +1,32 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+using System.Reflection;
+using OpenRA;
+
+[assembly: Platform(typeof(OpenRA.Platforms.Default.DeviceFactory))]
+
+namespace OpenRA.Platforms.Default
+{
+	public class DeviceFactory : IDeviceFactory
+	{
+		public IGraphicsDevice CreateGraphics(Size size, WindowMode windowMode)
+		{
+			return new Sdl2GraphicsDevice(size, windowMode);
+		}
+
+		public ISoundEngine CreateSound()
+		{
+			return new OpenAlSoundEngine();
+		}
+	}
+}