Add a per-player handicap option to the lobby.

Handicaps reduce unit health, firepower, and build speed.

OpenRA.Mods.Common/Traits/Multipliers/HandicapDamageMultiplier.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Modifies the damage applied to this actor based on the owner's handicap.")]
+	public class HandicapDamageMultiplierInfo : TraitInfo
+	{
+		public override object Create(ActorInitializer init) { return new HandicapDamageMultiplier(init.Self); }
+	}
+
+	public class HandicapDamageMultiplier : IDamageModifier
+	{
+		readonly Actor self;
+
+		public HandicapDamageMultiplier(Actor self)
+		{
+			this.self = self;
+		}
+
+		int IDamageModifier.GetDamageModifier(Actor attacker, Damage damage)
+		{
+			// Equivalent to the health handicap from C&C3:
+			//  5% handicap = 95% health = 105% damage
+			// 50% handicap = 50% health = 200% damage
+			// 95% handicap = 5% health = 2000% damage
+			return 10000 / (100 - self.Owner.Handicap);
+		}
+	}
+}

OpenRA.Mods.Common/Traits/Multipliers/HandicapFirepowerMultiplier.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Modifies the damage applied by this actor based on the owner's handicap.")]
+	public class HandicapFirepowerMultiplierInfo : TraitInfo
+	{
+		public override object Create(ActorInitializer init) { return new HandicapFirepowerMultiplier(init.Self); }
+	}
+
+	public class HandicapFirepowerMultiplier : IFirepowerModifier
+	{
+		readonly Actor self;
+
+		public HandicapFirepowerMultiplier(Actor self)
+		{
+			this.self = self;
+		}
+
+		int IFirepowerModifier.GetFirepowerModifier()
+		{
+			// Equivalent to the firepower handicap from C&C3:
+			//  5% handicap = 95% firepower
+			// 50% handicap = 50% firepower
+			// 95% handicap = 5% firepower
+			return 100 - self.Owner.Handicap;
+		}
+	}
+}

OpenRA.Mods.Common/Traits/Multipliers/HandicapProductionTimeMultiplier.cs

@@ -0,0 +1,32 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Modifies the production time of this actor based on the producer's handicap.")]
+	public class HandicapProductionTimeMultiplierInfo : TraitInfo<HandicapProductionTimeMultiplier>, IProductionTimeModifierInfo
+	{
+		int IProductionTimeModifierInfo.GetProductionTimeModifier(TechTree techTree, string queue)
+		{
+			// Equivalent to the build speed handicap from C&C3:
+			//  5% handicap = 105% build time
+			// 50% handicap = 150% build time
+			// 95% handicap = 195% build time
+			return 100 + techTree.Owner.Handicap;
+		}
+	}
+
+	public class HandicapProductionTimeMultiplier { }
+}

OpenRA.Mods.Common/Traits/Player/TechTree.cs

@@ -106,6 +106,8 @@ namespace OpenRA.Mods.Common.Traits
 			return ret;
 		}
 
+		public Player Owner { get { return player; } }
+
 		class Watcher
 		{
 			public readonly string Key;

OpenRA.Mods.Common/Traits/World/CreateMapPlayers.cs

@@ -64,6 +64,7 @@ namespace OpenRA.Mods.Common.Traits
 					DisplayFactionId = clientFaction.InternalName,
 					Color = client.Color,
 					Team = client.Team,
+					Handicap = client.Handicap,
 					SpawnPoint = resolvedSpawnPoint,
 					IsRandomFaction = clientFaction.RandomFactionMembers.Any(),
 					IsRandomSpawnPoint = client.SpawnPoint == 0,