Re-organize all projects (#4166)

Content.Server/Coordinates/Helpers/GridTileLookupHelpers.cs

@@ -0,0 +1,34 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Server.Coordinates.Helpers
+{
+    public static class GridTileLookupHelpers
+    {
+        /// <summary>
+        ///     Helper that returns all entities in a turf very fast.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static IEnumerable<IEntity> GetEntitiesInTileFast(this TileRef turf, GridTileLookupSystem? gridTileLookup = null)
+        {
+            gridTileLookup ??= EntitySystem.Get<GridTileLookupSystem>();
+
+            return gridTileLookup.GetEntitiesIntersecting(turf.GridIndex, turf.GridIndices);
+        }
+
+        /// <summary>
+        ///     Helper that returns all entities in a turf.
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static IEnumerable<IEntity> GetEntitiesInTileFast(this Vector2i indices, GridId gridId, GridTileLookupSystem? gridTileLookup = null)
+        {
+            gridTileLookup ??= EntitySystem.Get<GridTileLookupSystem>();
+            return gridTileLookup.GetEntitiesIntersecting(gridId, indices);
+        }
+    }
+}