Rename PathGraph to MapPathGraph.

Move PathCostForInvalidPath and MovementCostForUnreachableCell constants into a new static class, PathGraph.

OpenRA.Mods.Common/Pathfinder/MapPathGraph.cs

@@ -0,0 +1,56 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2022 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;
+using OpenRA.Mods.Common.Traits;
+
+namespace OpenRA.Mods.Common.Pathfinder
+{
+	/// <summary>
+	/// A dense pathfinding graph that supports a search over all cells within a map.
+	/// It implements the ability to cost and get connections for cells, and supports <see cref="ICustomMovementLayer"/>.
+	/// </summary>
+	sealed class MapPathGraph : DensePathGraph
+	{
+		readonly CellInfoLayerPool.PooledCellInfoLayer pooledLayer;
+		readonly CellLayer<CellInfo>[] cellInfoForLayer;
+
+		public MapPathGraph(CellInfoLayerPool layerPool, Locomotor locomotor, Actor actor, World world, BlockedByActor check,
+			Func<CPos, int> customCost, Actor ignoreActor, bool laneBias, bool inReverse)
+			: base(locomotor, actor, world, check, customCost, ignoreActor, laneBias, inReverse)
+		{
+			// As we support a search over the whole map area,
+			// use the pool to grab the CellInfos we need to track the graph state.
+			// This allows us to avoid the cost of allocating large arrays constantly.
+			// PERF: Avoid LINQ
+			pooledLayer = layerPool.Get();
+			cellInfoForLayer = new CellLayer<CellInfo>[CustomMovementLayers.Length];
+			cellInfoForLayer[0] = pooledLayer.GetLayer();
+			foreach (var cml in CustomMovementLayers)
+				if (cml != null && cml.EnabledForLocomotor(locomotor.Info))
+					cellInfoForLayer[cml.Index] = pooledLayer.GetLayer();
+		}
+
+		public override CellInfo this[CPos pos]
+		{
+			get => cellInfoForLayer[pos.Layer][pos];
+			set => cellInfoForLayer[pos.Layer][pos] = value;
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing)
+				pooledLayer.Dispose();
+
+			base.Dispose(disposing);
+		}
+	}
+}