make fog of war rendering optional for classic mods

OpenRA.Game/Graphics/ShroudRenderer.cs

@@ -129,8 +129,9 @@ namespace OpenRA.Graphics
 			}
 
 			var clipRect = Game.viewport.WorldBounds(wr.world);
-			DrawShroud(wr, clipRect, fogSprites, fogPalette);
 			DrawShroud(wr, clipRect, sprites, shroudPalette);
+			if (wr.world.WorldActor.HasTrait<Fog>())
+				DrawShroud(wr, clipRect, fogSprites, fogPalette);
 		}
 
 		void DrawShroud(WorldRenderer wr, Rectangle clip, Sprite[,] s, PaletteReference pal)

OpenRA.Game/OpenRA.Game.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -178,6 +178,7 @@
     <Compile Include="Traits\ValidateOrder.cs" />
     <Compile Include="Traits\Waypoint.cs" />
     <Compile Include="Traits\World\Country.cs" />
+    <Compile Include="Traits\World\Fog.cs" />
     <Compile Include="Traits\World\PlayerColorPalette.cs" />
     <Compile Include="Traits\World\ResourceLayer.cs" />
     <Compile Include="Traits\World\ResourceType.cs" />
@@ -194,7 +195,7 @@
     <Compile Include="Widgets\DropDownButtonWidget.cs" />
     <Compile Include="Widgets\GridLayout.cs" />
     <Compile Include="Widgets\ImageWidget.cs" />
-    <Compile Include="Widgets\LabelWidget.cs" />
+    <Compile Include="Widgets\LabelWidget.cs" />
     <Compile Include="Widgets\LineGraphWidget.cs" />
     <Compile Include="Widgets\ListLayout.cs" />
     <Compile Include="Widgets\MapPreviewWidget.cs" />

OpenRA.Game/Traits/World/Fog.cs

@@ -0,0 +1,22 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 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
+
+namespace OpenRA.Traits
+{
+	public class FogInfo : TraitInfo<Fog>
+	{
+		/*
+		 * This tag trait will enable fog of war in ShroudRenderer.
+		 * Don't forget about HiddenUnderFog and FrozenUnderFog.
+		 */
+	}
+	
+	public class Fog { }
+}

mods/cnc/rules/system.yaml

@@ -158,6 +158,7 @@ World:
 	SpatialBins:
 		BinSize: 4
 	Shroud:
+	Fog:
 	CrateSpawner:
 		Minimum: 1
 		Maximum: 6

mods/d2k/rules/system.yaml

@@ -353,6 +353,7 @@ World:
 	SpatialBins:
 		BinSize: 4
 	Shroud:
+	Fog:
 	PathFinder:
 	ValidateOrder:
 

mods/ra/rules/system.yaml

@@ -306,6 +306,7 @@ World:
 	SpatialBins:
 		BinSize: 4
 	Shroud:
+	Fog:
 	PathFinder:
 	ValidateOrder: