Atmos debug helpers (#2108)

* Atmos debug overlay

* Pressure direction information

* Atmos debug overlay: show excited tiles

Content.Client/GameObjects/EntitySystems/AtmosDebugOverlaySystem.cs

@@ -0,0 +1,84 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using Content.Client.Atmos;
+using Content.Shared.Atmos;
+using Content.Shared.GameObjects.EntitySystems.Atmos;
+using JetBrains.Annotations;
+using Robust.Client.Graphics;
+using Robust.Client.Interfaces.Graphics.Overlays;
+using Robust.Client.Interfaces.ResourceManagement;
+using Robust.Client.ResourceManagement;
+using Robust.Client.Utility;
+using Robust.Shared.Interfaces.Map;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Utility;
+
+namespace Content.Client.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    internal sealed class AtmosDebugOverlaySystem : SharedAtmosDebugOverlaySystem
+    {
+        [Dependency] private readonly IMapManager _mapManager = default!;
+        [Dependency] private readonly IResourceCache _resourceCache = default!;
+
+        private Dictionary<GridId, AtmosDebugOverlayMessage> _tileData =
+            new Dictionary<GridId, AtmosDebugOverlayMessage>();
+
+        private AtmosphereSystem _atmosphereSystem = default!;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeNetworkEvent<AtmosDebugOverlayMessage>(HandleAtmosDebugOverlayMessage);
+            _mapManager.OnGridRemoved += OnGridRemoved;
+
+            _atmosphereSystem = Get<AtmosphereSystem>();
+
+            var overlayManager = IoCManager.Resolve<IOverlayManager>();
+            if(!overlayManager.HasOverlay(nameof(AtmosDebugOverlay)))
+                overlayManager.AddOverlay(new AtmosDebugOverlay());
+        }
+
+        private void HandleAtmosDebugOverlayMessage(AtmosDebugOverlayMessage message)
+        {
+            _tileData[message.GridId] = message;
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            _mapManager.OnGridRemoved -= OnGridRemoved;
+            var overlayManager = IoCManager.Resolve<IOverlayManager>();
+            if(!overlayManager.HasOverlay(nameof(GasTileOverlay)))
+                overlayManager.RemoveOverlay(nameof(GasTileOverlay));
+        }
+
+        private void OnGridRemoved(GridId gridId)
+        {
+            if (_tileData.ContainsKey(gridId))
+            {
+                _tileData.Remove(gridId);
+            }
+        }
+
+        public bool HasData(GridId gridId)
+        {
+            return _tileData.ContainsKey(gridId);
+        }
+
+        public AtmosDebugOverlayData? GetData(GridId gridIndex, MapIndices indices)
+        {
+            if (!_tileData.TryGetValue(gridIndex, out var srcMsg))
+                return null;
+
+            var relative = indices - srcMsg.BaseIdx;
+            if (relative.X < 0 || relative.Y < 0 || relative.X >= LocalViewRange || relative.Y >= LocalViewRange)
+                return null;
+
+            return srcMsg.OverlayData[relative.X + (relative.Y * LocalViewRange)];
+        }
+    }
+}