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.D2k/Traits/World/BuildableTerrainLayer.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;
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.D2k.Traits
+{
+	[Desc("Attach this to the world actor. Required for LaysTerrain to work.")]
+	[TraitLocation(SystemActors.World)]
+	public class BuildableTerrainLayerInfo : TraitInfo, Requires<ITiledTerrainRendererInfo>
+	{
+		[Desc("Palette to render the layer sprites in.")]
+		public readonly string Palette = TileSet.TerrainPaletteInternalName;
+
+		[Desc("The hitpoints, which can be reduced by the DamagesConcreteWarhead.")]
+		public readonly int MaxStrength = 9000;
+
+		public override object Create(ActorInitializer init) { return new BuildableTerrainLayer(init.Self, this); }
+	}
+
+	public class BuildableTerrainLayer : IRenderOverlay, IWorldLoaded, ITickRender, IRadarTerrainLayer, INotifyActorDisposing
+	{
+		readonly BuildableTerrainLayerInfo info;
+		readonly Dictionary<CPos, TerrainTile?> dirty = [];
+		readonly ITiledTerrainRenderer terrainRenderer;
+		readonly World world;
+		readonly CellLayer<int> strength;
+		readonly CellLayer<(Color, Color)> radarColor;
+
+		TerrainSpriteLayer render;
+		PaletteReference paletteReference;
+		bool disposed;
+
+		public BuildableTerrainLayer(Actor self, BuildableTerrainLayerInfo info)
+		{
+			this.info = info;
+			world = self.World;
+			strength = new CellLayer<int>(world.Map);
+			radarColor = new CellLayer<(Color, Color)>(world.Map);
+			terrainRenderer = self.Trait<ITiledTerrainRenderer>();
+		}
+
+		void IWorldLoaded.WorldLoaded(World w, WorldRenderer wr)
+		{
+			render = new TerrainSpriteLayer(w, wr, terrainRenderer.MissingTile, BlendMode.Alpha, true);
+			paletteReference = wr.Palette(info.Palette);
+		}
+
+		public void AddTile(CPos cell, TerrainTile tile)
+		{
+			if (!strength.Contains(cell))
+				return;
+
+			var uv = cell.ToMPos(world.Map);
+			var tileInfo = world.Map.Rules.TerrainInfo.GetTerrainInfo(tile);
+			world.Map.CustomTerrain[uv] = tileInfo.TerrainType;
+			strength[uv] = info.MaxStrength;
+			radarColor[uv] = (tileInfo.GetColor(world.LocalRandom), tileInfo.GetColor(world.LocalRandom));
+			dirty[cell] = tile;
+		}
+
+		public void HitTile(CPos cell, int damage)
+		{
+			if (!strength.Contains(cell) || strength[cell] == 0)
+				return;
+
+			// Buildings (but not other actors) block damage to cells under their footprint
+			if (world.ActorMap.GetActorsAt(cell).Any(a => a.TraitOrDefault<Building>() != null))
+				return;
+
+			strength[cell] -= damage;
+			if (strength[cell] < 1)
+				RemoveTile(cell);
+		}
+
+		public void RemoveTile(CPos cell)
+		{
+			if (!strength.Contains(cell))
+				return;
+
+			var uv = cell.ToMPos(world.Map);
+			world.Map.CustomTerrain[uv] = byte.MaxValue;
+			strength[cell] = 0;
+			radarColor[uv] = (Color.Transparent, Color.Transparent);
+			dirty[cell] = null;
+		}
+
+		void ITickRender.TickRender(WorldRenderer wr, Actor self)
+		{
+			var remove = new List<CPos>();
+			foreach (var kv in dirty)
+			{
+				if (!self.World.FogObscures(kv.Key))
+				{
+					var tile = kv.Value;
+					if (tile.HasValue)
+					{
+						// Terrain tiles define their origin at the topleft
+						var s = terrainRenderer.TileSprite(tile.Value);
+						var ss = new Sprite(s.Sheet, s.Bounds, s.ZRamp, float2.Zero, s.Channel, s.BlendMode);
+						render.Update(kv.Key, ss, paletteReference);
+					}
+					else
+						render.Clear(kv.Key);
+
+					remove.Add(kv.Key);
+				}
+			}
+
+			foreach (var r in remove)
+				dirty.Remove(r);
+		}
+
+		void IRenderOverlay.Render(WorldRenderer wr)
+		{
+			render.Draw(wr.Viewport);
+		}
+
+		event Action<CPos> IRadarTerrainLayer.CellEntryChanged
+		{
+			add => radarColor.CellEntryChanged += value;
+			remove => radarColor.CellEntryChanged -= value;
+		}
+
+		bool IRadarTerrainLayer.TryGetTerrainColorPair(MPos uv, out (Color Left, Color Right) value)
+		{
+			value = radarColor[uv];
+			return strength[uv] > 0;
+		}
+
+		void INotifyActorDisposing.Disposing(Actor self)
+		{
+			if (disposed)
+				return;
+
+			render.Dispose();
+			disposed = true;
+		}
+	}
+}