riversong code showcase

Source/Riversong/Game/World/Roads/RoadNetwork.cs

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+using Unity.Collections;
+using Unity.Mathematics;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class RoadNetwork : NativeGrid<ushort>
+    {
+        /// <summary>
+        ///     Indicates that the tile is occupied by a road.
+        /// </summary>
+        private const int TileOccupiedBit = 1 << 15;
+
+        /// <summary>
+        ///     Mask selecting the bits indicating in which directions a road tile is connected to another road tile.
+        /// </summary>
+        private const int ConnectivityBits = 0xFF;
+
+        public RoadNetwork(int2 size) : base(size, Allocator.Persistent)
+        {
+        }
+
+        public void AddRoadTile(int2 tile)
+        {
+            SetValue(tile, TileOccupiedBit);
+            UpdateRoadTile(tile);
+        }
+
+        public void UpdateRoadTile(int2 tile)
+        {
+            if (!IsRoadTile(tile)) return;
+
+            ushort value = TileOccupiedBit;
+
+            if (tile.x > 0 && GetValue(tile + new int2(-1, 0)) != 0) value |= (ushort)DirectionsMask4.West;
+
+            if (tile.x < Size.x - 1 && GetValue(tile + new int2(1, 0)) != 0) value |= (ushort)DirectionsMask4.East;
+
+            if (tile.y > 0 && GetValue(tile + new int2(0, -1)) != 0) value |= (ushort)DirectionsMask4.South;
+
+            if (tile.y < Size.y - 1 && GetValue(tile + new int2(0, 1)) != 0) value |= (ushort)DirectionsMask4.North;
+
+            SetValue(tile, value);
+        }
+
+        public void RemoveRoadTile(int2 tile)
+        {
+            SetValue(tile, 0);
+        }
+
+        public DirectionsMask8 GetConnectivity(int2 tile)
+        {
+            return (DirectionsMask8)(GetValue(tile) & ConnectivityBits);
+        }
+
+        public bool IsRoadTile(int2 tile)
+        {
+            return GetValue(tile) != 0;
+        }
+    }
+}