Replace ChronoshiftPaletteEffect with a post-processing shader.

OpenRA.Mods.Cnc/Traits/PaletteEffects/ChronoshiftPostProcessEffect.cs

@@ -0,0 +1,56 @@
+#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.Graphics;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Cnc.Traits
+{
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
+	[Desc("Apply palette full screen rotations during chronoshifts. Add this to the world actor.")]
+	public class ChronoshiftPostProcessEffectInfo : TraitInfo
+	{
+		[Desc("Measured in ticks.")]
+		public readonly int ChronoEffectLength = 60;
+
+		public override object Create(ActorInitializer init) { return new ChronoshiftPostProcessEffect(this); }
+	}
+
+	public class ChronoshiftPostProcessEffect : RenderPostProcessPassBase, ITick
+	{
+		readonly ChronoshiftPostProcessEffectInfo info;
+		int remainingFrames;
+
+		public ChronoshiftPostProcessEffect(ChronoshiftPostProcessEffectInfo info)
+			: base("chronoshift", PostProcessPassType.AfterWorld)
+		{
+			this.info = info;
+		}
+
+		public void Enable()
+		{
+			remainingFrames = info.ChronoEffectLength;
+		}
+
+		void ITick.Tick(Actor self)
+		{
+			if (remainingFrames > 0)
+				remainingFrames--;
+		}
+
+		protected override bool Enabled => remainingFrames > 0;
+		protected override void PrepareRender(WorldRenderer wr, IShader shader)
+		{
+			shader.SetVec("Blend", (float)remainingFrames / info.ChronoEffectLength);
+		}
+	}
+}