riversong code showcase

Source/Riversong/Game/World/EntityIdMap/EntityIdMap.cs

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+using System;
+using Unity.Collections;
+using Unity.Mathematics;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class EntityIdMap : IDisposable
+    {
+        private NativeGrid<EntityIdMapValue> _data;
+
+        public EntityIdMap(int2 size)
+        {
+            _data = new NativeGrid<EntityIdMapValue>(size, Allocator.Persistent);
+        }
+
+        public void Dispose()
+        {
+            _data?.Dispose();
+            _data = null;
+        }
+
+        public void SetBuildingId(TileRect rect, int id)
+        {
+            foreach (var tile in TileRange.From(rect))
+            {
+                ref var value = ref _data.GetValueRW(tile);
+                value.BuildingId = id;
+            }
+        }
+
+        public void SetResourceNodeId(int2 tile, int id)
+        {
+            ref var value = ref _data.GetValueRW(tile);
+            value.ResourceNodeId = id;
+        }
+
+        public ref EntityIdMapValue GetValueRW(int2 tile)
+        {
+            return ref _data.GetValueRW(tile);
+        }
+
+        public NativeArray<EntityIdMapValue> GetNativeArray()
+        {
+            return _data.GetNativeArray();
+        }
+    }
+}