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/Effects/IEffect.cs

@@ -0,0 +1,28 @@
+#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.Graphics;
+
+namespace OpenRA.Effects
+{
+	public interface IEffect
+	{
+		void Tick(World world);
+		IEnumerable<IRenderable> Render(WorldRenderer r);
+	}
+
+	// Identifier interface for effects that are added to ScreenMap
+	public interface ISpatiallyPartitionable { }
+
+	public interface IEffectAboveShroud { IEnumerable<IRenderable> RenderAboveShroud(WorldRenderer wr); }
+	public interface IEffectAnnotation { IEnumerable<IRenderable> RenderAnnotation(WorldRenderer wr); }
+}