VGRoid support (#27659)

* Dungeon spawn support for grid spawns * Recursive dungeons working * Mask approach working * zack * More work * Fix recursive dungeons * Heap of work * weh * the cud * rar * Job * weh * weh * weh * Master merges * orch * weh * vgroid most of the work * Tweaks * Tweaks * weh * do do do do do do * Basic layout * Ore spawning working * Big breaking changes * Mob gen working * weh * Finalising * emo * More finalising * reverty * Reduce distance
2024-07-03 22:23:11 +10:00
parent 1faa1b5df6
commit a2f99cc69e
103 changed files with 4928 additions and 2627 deletions
--- a/Content.Server/NPC/Pathfinding/PathfindingSystem.Breadth.cs
+++ b/Content.Server/NPC/Pathfinding/PathfindingSystem.Breadth.cs
@@ -0,0 +1,123 @@
+namespace Content.Server.NPC.Pathfinding;
+
+public sealed partial class PathfindingSystem
+{
+    /*
+     * Handle BFS searches from Start->End. Doesn't consider NPC pathfinding.
+     */
+
+    /// <summary>
+    /// Pathfinding args for a 1-many path.
+    /// </summary>
+    public record struct BreadthPathArgs()
+    {
+        public Vector2i Start;
+        public List<Vector2i> Ends;
+
+        public bool Diagonals = false;
+
+        public Func<Vector2i, float>? TileCost;
+
+        public int Limit = 10000;
+    }
+
+    /// <summary>
+    /// Gets a BFS path from start to any end. Can also supply an optional tile-cost for tiles.
+    /// </summary>
+    public SimplePathResult GetBreadthPath(BreadthPathArgs args)
+    {
+        var cameFrom = new Dictionary<Vector2i, Vector2i>();
+        var costSoFar = new Dictionary<Vector2i, float>();
+        var frontier = new PriorityQueue<Vector2i, float>();
+
+        costSoFar[args.Start] = 0f;
+        frontier.Enqueue(args.Start, 0f);
+        var count = 0;
+
+        while (frontier.TryDequeue(out var node, out _) && count < args.Limit)
+        {
+            count++;
+
+            if (args.Ends.Contains(node))
+            {
+                // Found target
+                var path = ReconstructPath(node, cameFrom);
+
+                return new SimplePathResult()
+                {
+                    CameFrom = cameFrom,
+                    Path = path,
+                };
+            }
+
+            var gCost = costSoFar[node];
+
+            if (args.Diagonals)
+            {
+                for (var x = -1; x <= 1; x++)
+                {
+                    for (var y = -1; y <= 1; y++)
+                    {
+                        var neighbor = node + new Vector2i(x, y);
+                        var neighborCost = OctileDistance(node, neighbor) * args.TileCost?.Invoke(neighbor) ?? 1f;
+
+                        if (neighborCost.Equals(0f))
+                        {
+                            continue;
+                        }
+
+                        // f = g + h
+                        // gScore is distance to the start node
+                        // hScore is distance to the end node
+                        var gScore = gCost + neighborCost;
+
+                        // Slower to get here so just ignore it.
+                        if (costSoFar.TryGetValue(neighbor, out var nextValue) && gScore >= nextValue)
+                        {
+                            continue;
+                        }
+
+                        cameFrom[neighbor] = node;
+                        costSoFar[neighbor] = gScore;
+                        // pFactor is tie-breaker where the fscore is otherwise equal.
+                        // See http://theory.stanford.edu/~amitp/GameProgramming/Heuristics.html#breaking-ties
+                        // There's other ways to do it but future consideration
+                        // The closer the fScore is to the actual distance then the better the pathfinder will be
+                        // (i.e. somewhere between 1 and infinite)
+                        // Can use hierarchical pathfinder or whatever to improve the heuristic but this is fine for now.
+                        frontier.Enqueue(neighbor, gScore);
+                    }
+                }
+            }
+            else
+            {
+                for (var x = -1; x <= 1; x++)
+                {
+                    for (var y = -1; y <= 1; y++)
+                    {
+                        if (x != 0 && y != 0)
+                            continue;
+
+                        var neighbor = node + new Vector2i(x, y);
+                        var neighborCost = ManhattanDistance(node, neighbor) * args.TileCost?.Invoke(neighbor) ?? 1f;
+
+                        if (neighborCost.Equals(0f))
+                            continue;
+
+                        var gScore = gCost + neighborCost;
+
+                        if (costSoFar.TryGetValue(neighbor, out var nextValue) && gScore >= nextValue)
+                            continue;
+
+                        cameFrom[neighbor] = node;
+                        costSoFar[neighbor] = gScore;
+
+                        frontier.Enqueue(neighbor, gScore);
+                    }
+                }
+            }
+        }
+
+        return SimplePathResult.NoPath;
+    }
+}