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.Mods.Common/Traits/Infantry/TerrainModifiesDamage.cs

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+#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.Frozen;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public class TerrainModifiesDamageInfo : TraitInfo
+	{
+		[FieldLoader.Require]
+		[Desc("Damage percentage for specific terrain types. 120 = 120%, 80 = 80%, etc.")]
+		public readonly FrozenDictionary<string, int> TerrainModifier = null;
+
+		[Desc("Modify healing damage? For example: A friendly medic.")]
+		public readonly bool ModifyHealing = false;
+
+		public override object Create(ActorInitializer init) { return new TerrainModifiesDamage(init.Self, this); }
+	}
+
+	public class TerrainModifiesDamage : IDamageModifier
+	{
+		const int FullDamage = 100;
+
+		public readonly TerrainModifiesDamageInfo Info;
+
+		readonly Actor self;
+
+		public TerrainModifiesDamage(Actor self, TerrainModifiesDamageInfo info)
+		{
+			Info = info;
+			this.self = self;
+		}
+
+		int IDamageModifier.GetDamageModifier(Actor attacker, Damage damage)
+		{
+			if (!Info.ModifyHealing && attacker.Owner.IsAlliedWith(self.Owner) && damage != null && damage.Value < 0)
+				return FullDamage;
+
+			var world = self.World;
+			var map = world.Map;
+
+			var pos = map.CellContaining(self.CenterPosition);
+			var terrainType = map.GetTerrainInfo(pos).Type;
+
+			if (!Info.TerrainModifier.TryGetValue(terrainType, out var modifiedDamage))
+				return FullDamage;
+
+			return modifiedDamage;
+		}
+	}
+}