Replace FlashPaletteEffect with a post-processing shader.

OpenRA.Mods.Common/Warheads/FlashEffectWarhead.cs

@@ -0,0 +1,35 @@
+#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 OpenRA.GameRules;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Warheads
+{
+	[Desc("Used to trigger a FlashPostProcessEffect trait on the world actor.")]
+	public class FlashEffectWarhead : Warhead
+	{
+		[Desc("Corresponds to `Type` from `FlashPostProcessEffect` on the world actor.")]
+		public readonly string FlashType = null;
+
+		[FieldLoader.Require]
+		[Desc("Duration of the flashing, measured in ticks. Set to -1 to default to the `Length` of the `FlashPostProcessEffect`.")]
+		public readonly int Duration = 0;
+
+		public override void DoImpact(in Target target, WarheadArgs args)
+		{
+			foreach (var flash in args.SourceActor.World.WorldActor.TraitsImplementing<FlashPostProcessEffect>())
+				if (flash.Info.Type == FlashType)
+					flash.Enable(Duration);
+		}
+	}
+}