Update and clean up Prototype manager methods

.github/CODEOWNERS

@@ -11,7 +11,7 @@
 /Robust.Analyzers @PaulRitter
 /Robust.*/GameStates @PaulRitter
 /Robust.Shared/Analyzers @PaulRitter
-/Robust.*/Serialization @PaulRitter @DrSmugleaf
+/Robust.*/Serialization @PaulRitter
 /Robust.*/Prototypes @PaulRitter
 /Robust.Shared/GameObjects/ComponentDependencies @PaulRitter
 /Robust.*/Containers @PaulRitter

.github/workflows/build-test.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 6.0.100
     - name: Install dependencies
       run: dotnet restore
     - name: Build

.gitignore

@@ -76,5 +76,3 @@ MSBuild/Robust.Custom.targets
 
 
 release/
-Robust.Docfx/*-site
-Robust.Docfx/api

MSBuild/Robust.Engine.Version.props

@@ -1,4 +1,4 @@
 <Project>
     <!-- This file automatically reset by Tools/version.py -->
-    <PropertyGroup><Version>0.8.74</Version></PropertyGroup>
+    <PropertyGroup><Version>0.8.52</Version></PropertyGroup>
 </Project>

Robust.Analyzers/Robust.Analyzers.csproj

@@ -6,9 +6,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="4.0.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="3.8.0" />
   </ItemGroup>
 
 </Project>

Robust.Client.Injectors/Robust.Client.Injectors.csproj

@@ -6,7 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Microsoft.Build.Framework" Version="17.0.0" />
+      <PackageReference Include="Microsoft.Build.Framework" Version="16.8.0" />
       <PackageReference Include="Mono.Cecil" Version="0.11.3" />
       <PackageReference Include="Pidgin" Version="2.5.0" />
     </ItemGroup>

Robust.Client.NameGenerator/Robust.Client.NameGenerator.csproj

@@ -5,8 +5,8 @@
     </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>

Robust.Client/BaseClient.cs

@@ -26,6 +26,7 @@ namespace Robust.Client
         [Dependency] private readonly IPlayerManager _playMan = default!;
         [Dependency] private readonly INetConfigurationManager _configManager = default!;
         [Dependency] private readonly IClientEntityManager _entityManager = default!;
+        [Dependency] private readonly IEntityLookup _entityLookup = default!;
         [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly IDiscordRichPresence _discord = default!;
         [Dependency] private readonly IGameTiming _timing = default!;
@@ -212,6 +213,7 @@ namespace Robust.Client
         {
             _entityManager.Startup();
             _mapManager.Startup();
+            _entityLookup.Startup();
 
             _timing.ResetSimTime();
             _timing.Paused = false;
@@ -222,6 +224,7 @@ namespace Robust.Client
             IoCManager.Resolve<INetConfigurationManager>().FlushMessages();
             _gameStates.Reset();
             _playMan.Shutdown();
+            _entityLookup.Shutdown();
             _entityManager.Shutdown();
             _mapManager.Shutdown();
             _discord.ClearPresence();

Robust.Client/ClientIoC.cs

@@ -47,6 +47,7 @@ namespace Robust.Client
             IoCManager.Register<IMapManagerInternal, NetworkedMapManager>();
             IoCManager.Register<INetworkedMapManager, NetworkedMapManager>();
             IoCManager.Register<IEntityManager, ClientEntityManager>();
+            IoCManager.Register<IEntityLookup, EntityLookup>();
             IoCManager.Register<IReflectionManager, ClientReflectionManager>();
             IoCManager.Register<IConsoleHost, ClientConsoleHost>();
             IoCManager.Register<IClientConsoleHost, ClientConsoleHost>();
@@ -71,6 +72,7 @@ namespace Robust.Client
             IoCManager.Register<IStateManager, StateManager>();
             IoCManager.Register<IUserInterfaceManager, UserInterfaceManager>();
             IoCManager.Register<IUserInterfaceManagerInternal, UserInterfaceManager>();
+            IoCManager.Register<IDebugDrawing, DebugDrawing>();
             IoCManager.Register<ILightManager, LightManager>();
             IoCManager.Register<IDiscordRichPresence, DiscordRichPresence>();
             IoCManager.Register<IMidiManager, MidiManager>();

Robust.Client/Console/ClientConsoleHost.cs

@@ -109,13 +109,13 @@ namespace Robust.Client.Console
             if (AvailableCommands.ContainsKey(commandName))
             {
                 var playerManager = IoCManager.Resolve<IPlayerManager>();
-#if !DEBUG
+
                 if (!_conGroup.CanCommand(commandName) && playerManager.LocalPlayer?.Session.Status > SessionStatus.Connecting)
                 {
                     WriteError(null, $"Insufficient perms for command: {commandName}");
                     return;
                 }
-#endif
+
                 var command1 = AvailableCommands[commandName];
                 args.RemoveAt(0);
                 var shell = new ConsoleShell(this, null);

Robust.Client/Console/Commands/Debug.cs

@@ -168,7 +168,7 @@ namespace Robust.Client.Console.Commands
 
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            var mgr = EntitySystem.Get<DebugDrawingSystem>();
+            var mgr = IoCManager.Resolve<IDebugDrawing>();
             mgr.DebugPositions = !mgr.DebugPositions;
         }
     }
@@ -861,7 +861,7 @@ namespace Robust.Client.Console.Commands
             var chunkIndex = grid.LocalToChunkIndices(grid.MapToGrid(mousePos));
             var chunk = internalGrid.GetChunk(chunkIndex);
 
-            shell.WriteLine($"worldBounds: {internalGrid.CalcWorldAABB(chunk)} localBounds: {chunk.CachedBounds}");
+            shell.WriteLine($"worldBounds: {chunk.CalcWorldAABB()} localBounds: {chunk.CalcLocalBounds()}");
         }
     }
 

Robust.Client/Debugging/DebugDrawing.cs

@@ -6,21 +6,17 @@ using Robust.Shared.Maths;
 
 namespace Robust.Client.Debugging
 {
-    /// <summary>
-    /// A collection of visual debug overlays for the client game.
-    /// </summary>
-    public sealed class DebugDrawingSystem : EntitySystem
+    /// <inheritdoc />
+    public sealed class DebugDrawing : IDebugDrawing
     {
         [Dependency] private readonly IOverlayManager _overlayManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;
-        [Dependency] private readonly EntityLookupSystem _lookup = default!;
 
         private bool _debugPositions;
 
-        /// <summary>
-        /// Toggles the visual overlay of the local origin for each entity on screen.
-        /// </summary>
+        /// <inheritdoc />
         public bool DebugPositions
         {
             get => _debugPositions;
@@ -46,13 +42,13 @@ namespace Robust.Client.Debugging
 
         private sealed class EntityPositionOverlay : Overlay
         {
-            private readonly EntityLookupSystem _lookup;
+            private readonly IEntityLookup _lookup;
             private readonly IEyeManager _eyeManager;
             private readonly IEntityManager _entityManager;
 
             public override OverlaySpace Space => OverlaySpace.WorldSpace;
 
-            public EntityPositionOverlay(EntityLookupSystem lookup, IEyeManager eyeManager, IEntityManager entityManager)
+            public EntityPositionOverlay(IEntityLookup lookup, IEyeManager eyeManager, IEntityManager entityManager)
             {
                 _lookup = lookup;
                 _eyeManager = eyeManager;
@@ -65,11 +61,13 @@ namespace Robust.Client.Debugging
 
                 var worldHandle = (DrawingHandleWorld) args.DrawingHandle;
                 var viewport = _eyeManager.GetWorldViewport();
-                var xformQuery = _entityManager.GetEntityQuery<TransformComponent>();
 
                 foreach (var entity in _lookup.GetEntitiesIntersecting(_eyeManager.CurrentMap, viewport))
                 {
-                    var (center, worldRotation) = xformQuery.GetComponent(entity).GetWorldPositionRotation();
+                    var transform = _entityManager.GetComponent<TransformComponent>(entity);
+
+                    var center = transform.WorldPosition;
+                    var worldRotation = transform.WorldRotation;
 
                     var xLine = worldRotation.RotateVec(Vector2.UnitX);
                     var yLine = worldRotation.RotateVec(Vector2.UnitY);

Robust.Client/Debugging/IDebugDrawing.cs

@@ -0,0 +1,13 @@
+namespace Robust.Client.Debugging
+{
+    /// <summary>
+    /// A collection of visual debug overlays for the client game.
+    /// </summary>
+    public interface IDebugDrawing
+    {
+        /// <summary>
+        /// Toggles the visual overlay of the local origin for each entity on screen.
+        /// </summary>
+        bool DebugPositions { get; set; }
+    }
+}

Robust.Client/GameController/GameController.cs

@@ -50,6 +50,7 @@ namespace Robust.Client
         [Dependency] private readonly IClientConsoleHost _console = default!;
         [Dependency] private readonly ITimerManager _timerManager = default!;
         [Dependency] private readonly IClientEntityManager _entityManager = default!;
+        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IPlacementManager _placementManager = default!;
         [Dependency] private readonly IClientGameStateManager _gameStateManager = default!;
         [Dependency] private readonly IOverlayManagerInternal _overlayManager = default!;
@@ -454,7 +455,6 @@ namespace Robust.Client
         private void Tick(FrameEventArgs frameEventArgs)
         {
             _modLoader.BroadcastUpdate(ModUpdateLevel.PreEngine, frameEventArgs);
-            _console.CommandBufferExecute();
             _timerManager.UpdateTimers(frameEventArgs);
             _taskManager.ProcessPendingTasks();
 
@@ -470,6 +470,7 @@ namespace Robust.Client
                 // The last real tick is the current tick! This way we won't be in "prediction" mode.
                 _gameTiming.LastRealTick = _gameTiming.CurTick;
                 _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false);
+                _lookup.Update();
             }
 
             _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);
@@ -509,7 +510,7 @@ namespace Robust.Client
             logManager.GetSawmill("discord").Level = LogLevel.Warning;
             logManager.GetSawmill("net.predict").Level = LogLevel.Info;
             logManager.GetSawmill("szr").Level = LogLevel.Info;
-            logManager.GetSawmill("loc").Level = LogLevel.Warning;
+            logManager.GetSawmill("loc").Level = LogLevel.Error;
 
 #if DEBUG_ONLY_FCE_INFO
 #if DEBUG_ONLY_FCE_LOG
@@ -574,6 +575,7 @@ namespace Robust.Client
 
             _networkManager.Shutdown("Client shutting down");
             _midiManager.Shutdown();
+            IoCManager.Resolve<IEntityLookup>().Shutdown();
             _entityManager.Shutdown();
             _clyde.Shutdown();
             _clydeAudio.Shutdown();

Robust.Client/GameObjects/Components/Light/ClientOccluderComponent.cs

@@ -8,7 +8,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Client.GameObjects
 {
     [ComponentReference(typeof(OccluderComponent))]
-    public sealed class ClientOccluderComponent : OccluderComponent
+    internal sealed class ClientOccluderComponent : OccluderComponent
     {
         [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;
@@ -71,29 +71,13 @@ namespace Robust.Client.GameObjects
         {
             Occluding = OccluderDir.None;
 
-            if (Deleted)
-                return;
-
-            // Content may want to override the default behavior for occlusion.
-            var xform = _entityManager.GetComponent<TransformComponent>(Owner);
-            var ev = new OccluderDirectionsEvent
+            if (Deleted || !_entityManager.GetComponent<TransformComponent>(Owner).Anchored)
             {
-                Component = xform,
-            };
-
-            _entityManager.EventBus.RaiseLocalEvent(Owner, ref ev);
-
-            if (ev.Handled)
-            {
-                Occluding = ev.Directions;
                 return;
             }
 
-            if (!xform.Anchored)
-                return;
-
-            var grid = _mapManager.GetGrid(xform.GridID);
-            var position = xform.Coordinates;
+            var grid = _mapManager.GetGrid(_entityManager.GetComponent<TransformComponent>(Owner).GridID);
+            var position = _entityManager.GetComponent<TransformComponent>(Owner).Coordinates;
             void CheckDir(Direction dir, OccluderDir oclDir)
             {
                 foreach (var neighbor in grid.GetInDir(position, dir))
@@ -106,7 +90,7 @@ namespace Robust.Client.GameObjects
                 }
             }
 
-            var angle = xform.LocalRotation;
+            var angle = _entityManager.GetComponent<TransformComponent>(Owner).LocalRotation;
             var dirRolling = angle.GetCardinalDir();
             // dirRolling starts at effective south
 
@@ -121,28 +105,15 @@ namespace Robust.Client.GameObjects
 
             CheckDir(dirRolling, OccluderDir.East);
         }
-    }
 
-    [Flags]
-    public enum OccluderDir : byte
-    {
-        None = 0,
-        North = 1,
-        East = 1 << 1,
-        South = 1 << 2,
-        West = 1 << 3,
-    }
-
-    /// <summary>
-    /// Raised by occluders when trying to get occlusion directions.
-    /// </summary>
-    [ByRefEvent]
-    public struct OccluderDirectionsEvent
-    {
-        public bool Handled = false;
-        public OccluderDir Directions = OccluderDir.None;
-        public TransformComponent Component = default!;
-
-        public OccluderDirectionsEvent() {}
+        [Flags]
+        internal enum OccluderDir : byte
+        {
+            None = 0,
+            North = 1,
+            East = 1 << 1,
+            South = 1 << 2,
+            West = 1 << 3,
+        }
     }
 }

Robust.Client/GameObjects/Components/Renderable/ISpriteComponent.cs

@@ -119,8 +119,7 @@ namespace Robust.Client.GameObjects
         ///     This is useful to allow layer map configs to be defined in prototypes,
         ///     while still allowing code to create configs if they're absent.
         /// </remarks>
-        /// <returns>Index of the new layer.</returns>
-        int LayerMapReserveBlank(object key);
+        void LayerMapReserveBlank(object key);
 
         /// <summary>
         ///     Adds a layer without texture (thus falling back to the error texture).
@@ -146,8 +145,8 @@ namespace Robust.Client.GameObjects
         void RemoveLayer(int layer);
         void RemoveLayer(object layerKey);
 
-        void LayerSetShader(int layer, ShaderInstance shader, string? prototype = null);
-        void LayerSetShader(object layerKey, ShaderInstance shader, string? prototype = null);
+        void LayerSetShader(int layer, ShaderInstance shader);
+        void LayerSetShader(object layerKey, ShaderInstance shader);
         void LayerSetShader(int layer, string shaderName);
         void LayerSetShader(object layerKey, string shaderName);
 
@@ -218,8 +217,8 @@ namespace Robust.Client.GameObjects
         int GetLayerDirectionCount(ISpriteLayer layer);
 
         /// <summary>
-        ///     Calculate the rotated sprite bounding box in world-space coordinates.
+        ///     Calculate sprite bounding box in world-space coordinates.
         /// </summary>
-        Box2Rotated CalculateRotatedBoundingBox(Vector2 worldPosition, Angle worldRotation, IEye? eye = null);
+        Box2 CalculateBoundingBox(Vector2 worldPos);
     }
 }

Robust.Client/GameObjects/Components/Renderable/ISpriteLayer.cs

@@ -25,6 +25,8 @@ namespace Robust.Client.GameObjects
 
         RSI.State.Direction EffectiveDirection(Angle worldRotation);
 
+        Vector2 LocalToLayer(Vector2 localPos);
+
         /// <summary>
         ///     Layer size in pixels.
         ///     Don't account layer scale or sprite world transform.
@@ -35,6 +37,6 @@ namespace Robust.Client.GameObjects
         ///     Calculate layer bounding box in sprite local-space coordinates.
         /// </summary>
         /// <returns>Bounding box in sprite local-space coordinates.</returns>
-        Box2 CalculateBoundingBox(Angle worldAngle);
+        Box2 CalculateBoundingBox();
     }
 }

Robust.Client/GameObjects/Components/Renderable/SpriteBoundsOverlay.cs

@@ -84,16 +84,10 @@ namespace Robust.Client.GameObjects
 
                 foreach (var sprite in comp.SpriteTree.QueryAabb(localAABB))
                 {
-                    var (worldPos, worldRot) = _entityManager.GetComponent<TransformComponent>(sprite.Owner).GetWorldPositionRotation();
-                    var bounds = sprite.CalculateRotatedBoundingBox(worldPos, worldRot);
-
-                    // Get scaled down bounds used to indicate the "south" of a sprite.
-                    var localBound = bounds.Box;
-                    var smallLocal = localBound.Scale(0.2f).Translated(-new Vector2(0f, localBound.Extents.Y));
-                    var southIndicator = new Box2Rotated(smallLocal, bounds.Rotation, bounds.Origin);
-
+                    var worldPos = _entityManager.GetComponent<TransformComponent>(sprite.Owner).WorldPosition;
+                    var bounds = sprite.CalculateBoundingBox(worldPos);
                     handle.DrawRect(bounds, Color.Red.WithAlpha(0.2f));
-                    handle.DrawRect(southIndicator, Color.Blue.WithAlpha(0.5f));
+                    handle.DrawRect(bounds.Scale(0.2f).Translated(-new Vector2(0f, bounds.Extents.Y)), Color.Blue.WithAlpha(0.5f));
                 }
             }
         }

Robust.Client/GameObjects/Components/Renderable/SpriteComponent.cs

@@ -20,7 +20,6 @@ using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 using DrawDepthTag = Robust.Shared.GameObjects.DrawDepth;
-using RSIDirection = Robust.Client.Graphics.RSI.State.Direction;
 
 namespace Robust.Client.GameObjects
 {
@@ -32,8 +31,6 @@ namespace Robust.Client.GameObjects
         [Dependency] private readonly IResourceCache resourceCache = default!;
         [Dependency] private readonly IPrototypeManager prototypes = default!;
         [Dependency] private readonly IEntityManager entities = default!;
-        [Dependency] private readonly IReflectionManager reflection = default!;
-        [Dependency] private readonly IEyeManager eyeManager = default!;
 
         [DataField("visible")]
         private bool _visible = true;
@@ -75,11 +72,7 @@ namespace Robust.Client.GameObjects
         public Vector2 Scale
         {
             get => scale;
-            set
-            {
-                scale = value;
-                UpdateLocalMatrix();
-            }
+            set => scale = value;
         }
 
         [DataField("rotation")]
@@ -90,11 +83,7 @@ namespace Robust.Client.GameObjects
         public Angle Rotation
         {
             get => rotation;
-            set
-            {
-                rotation = value;
-                UpdateLocalMatrix();
-            }
+            set => rotation = value;
         }
 
         [DataField("offset")]
@@ -108,18 +97,12 @@ namespace Robust.Client.GameObjects
         public Vector2 Offset
         {
             get => offset;
-            set
-            {
-                offset = value;
-                UpdateLocalMatrix();
-            }
+            set => offset = value;
         }
 
         [DataField("color")]
         private Color color = Color.White;
 
-        public Matrix3 LocalMatrix = Matrix3.Identity;
-
         [Animatable]
         [ViewVariables(VVAccess.ReadWrite)]
         public Color Color
@@ -151,7 +134,113 @@ namespace Robust.Client.GameObjects
                 Layers.Clear();
                 foreach (var layerDatum in value)
                 {
-                    AddLayer(layerDatum);
+                    var anyTextureAttempted = false;
+                    var layer = new Layer(this);
+                    if (!string.IsNullOrWhiteSpace(layerDatum.RsiPath))
+                    {
+                        var path = TextureRoot / layerDatum.RsiPath;
+
+                        if (IoCManager.Resolve<IResourceCache>().TryGetResource(path, out RSIResource? resource))
+                        {
+                            layer.RSI = resource.RSI;
+                        }
+                        else
+                        {
+                            Logger.ErrorS(LogCategory, "Unable to load layer RSI '{0}'.", path);
+                        }
+                    }
+
+                    if (!string.IsNullOrWhiteSpace(layerDatum.State))
+                    {
+                        anyTextureAttempted = true;
+                        var theRsi = layer.RSI ?? BaseRSI;
+                        if (theRsi == null)
+                        {
+                            Logger.ErrorS(LogCategory,
+                                "Layer has no RSI to load states from. Cannot use 'state' property. ({0})",
+                                layerDatum.State);
+                        }
+                        else
+                        {
+                            var stateid = new RSI.StateId(layerDatum.State);
+                            layer.State = stateid;
+                            if (theRsi.TryGetState(stateid, out var state))
+                            {
+                                // Always use south because this layer will be cached in the serializer.
+                                layer.AnimationTimeLeft = state.GetDelay(0);
+                            }
+                            else
+                            {
+                                Logger.ErrorS(LogCategory,
+                                    $"State '{stateid}' not found in RSI: '{theRsi.Path}'.",
+                                    stateid);
+                            }
+                        }
+                    }
+
+                    if (!string.IsNullOrWhiteSpace(layerDatum.TexturePath))
+                    {
+                        anyTextureAttempted = true;
+                        if (layer.State.IsValid)
+                        {
+                            Logger.ErrorS(LogCategory,
+                                "Cannot specify 'texture' on a layer if it has an RSI state specified."
+                            );
+                        }
+                        else
+                        {
+                            layer.Texture =
+                                IoCManager.Resolve<IResourceCache>().GetResource<TextureResource>(TextureRoot / layerDatum.TexturePath);
+                        }
+                    }
+
+                    if (!string.IsNullOrWhiteSpace(layerDatum.Shader))
+                    {
+                        if (IoCManager.Resolve<IPrototypeManager>().TryIndex<ShaderPrototype>(layerDatum.Shader, out var prototype))
+                        {
+                            layer.Shader = prototype.Instance();
+                        }
+                        else
+                        {
+                            Logger.ErrorS(LogCategory,
+                                "Shader prototype '{0}' does not exist.",
+                                layerDatum.Shader);
+                        }
+                    }
+
+                    layer.Color = layerDatum.Color;
+                    layer.Rotation = layerDatum.Rotation;
+                    layer._offset = layerDatum.Offset;
+                    // If neither state: nor texture: were provided we assume that they want a blank invisible layer.
+                    layer.Visible = anyTextureAttempted && layerDatum.Visible;
+                    layer.Scale = layerDatum.Scale;
+
+                    Layers.Add(layer);
+
+                    if (layerDatum.MapKeys != null)
+                    {
+                        var index = Layers.Count - 1;
+                        foreach (var keyString in layerDatum.MapKeys)
+                        {
+                            object key;
+                            if (IoCManager.Resolve<IReflectionManager>().TryParseEnumReference(keyString, out var @enum))
+                            {
+                                key = @enum;
+                            }
+                            else
+                            {
+                                key = keyString;
+                            }
+
+                            if (LayerMap.ContainsKey(key))
+                            {
+                                Logger.ErrorS(LogCategory, "Duplicate layer map key definition: {0}", key);
+                                continue;
+                            }
+
+                            LayerMap.Add(key, index);
+                        }
+                    }
                 }
 
                 _layerMapShared = true;
@@ -247,13 +336,11 @@ namespace Robust.Client.GameObjects
 
         void ISerializationHooks.AfterDeserialization()
         {
-            IoCManager.InjectDependencies(this);
-
             {
                 if (!string.IsNullOrWhiteSpace(rsi))
                 {
                     var rsiPath = TextureRoot / rsi;
-                    if(resourceCache.TryGetResource(rsiPath, out RSIResource? resource))
+                    if(IoCManager.Resolve<IResourceCache>().TryGetResource(rsiPath, out RSIResource? resource))
                     {
                         BaseRSI = resource.RSI;
                     }
@@ -286,8 +373,6 @@ namespace Robust.Client.GameObjects
                 LayerMap.Clear();
                 LayerDatums = layerDatums;
             }
-
-            UpdateLocalMatrix();
         }
 
         /// <summary>
@@ -305,7 +390,6 @@ namespace Robust.Client.GameObjects
             offset = other.offset;
             rotation = other.rotation;
             scale = other.scale;
-            UpdateLocalMatrix();
             drawDepth = other.drawDepth;
             _screenLock = other._screenLock;
             _overrideDirection = other._overrideDirection;
@@ -331,14 +415,9 @@ namespace Robust.Client.GameObjects
             RenderOrder = other.RenderOrder;
         }
 
-        internal void UpdateLocalMatrix()
-        {
-            LocalMatrix = Matrix3.CreateTransform(in offset, in rotation, in scale);
-        }
-
         public Matrix3 GetLocalMatrix()
         {
-            return LocalMatrix;
+            return Matrix3.CreateTransform(in offset, in rotation, in scale);
         }
 
         /// <inheritdoc />
@@ -383,17 +462,14 @@ namespace Robust.Client.GameObjects
             _layerMapShared = false;
         }
 
-        public int LayerMapReserveBlank(object key)
+        public void LayerMapReserveBlank(object key)
         {
-            if (LayerMapTryGet(key, out var index))
+            if (LayerMapTryGet(key, out var _))
             {
-                return index;
+                return;
             }
 
-            index = AddBlankLayer();
-            LayerMapSet(key, index);
-
-            return index;
+            LayerMapSet(key, AddBlankLayer());
         }
 
         public int AddBlankLayer(int? newIndex = null)
@@ -402,19 +478,6 @@ namespace Robust.Client.GameObjects
             return AddLayer(layer, newIndex);
         }
 
-        /// <summary>
-        ///     Add a new layer based on some <see cref="PrototypeLayerData"/>.
-        /// </summary>
-        public int AddLayer(PrototypeLayerData layerDatum, int? newIndex = null)
-        {
-            var layer = new Layer(this);
-
-            var index = AddLayer(layer, newIndex);
-
-            LayerSetData(index, layerDatum);
-            return index;
-        }
-
         public int AddLayer(string texturePath, int? newIndex = null)
         {
             return AddLayer(new ResourcePath(texturePath), newIndex);
@@ -590,144 +653,7 @@ namespace Robust.Client.GameObjects
             RemoveLayer(layer);
         }
 
-        /// <summary>
-        ///     Fills in a layer's values using some <see cref="PrototypeLayerData"/>.
-        /// </summary>
-        public void LayerSetData(int index, PrototypeLayerData layerDatum)
-        {
-            if (Layers.Count <= index)
-            {
-                Logger.ErrorS(LogCategory, "Layer with index '{0}' does not exist, cannot set layer data! Trace:\n{1}",
-                    index, Environment.StackTrace);
-                return;
-            }
-
-            var layer = Layers[index];
-
-            var anyTextureAttempted = false;
-
-            if (!string.IsNullOrWhiteSpace(layerDatum.RsiPath))
-            {
-                var path = TextureRoot / layerDatum.RsiPath;
-
-                if (resourceCache.TryGetResource(path, out RSIResource? resource))
-                {
-                    layer.RSI = resource.RSI;
-                }
-                else
-                {
-                    Logger.ErrorS(LogCategory, "Unable to load layer RSI '{0}'.", path);
-                }
-            }
-
-            if (!string.IsNullOrWhiteSpace(layerDatum.State))
-            {
-                anyTextureAttempted = true;
-                var theRsi = layer.RSI ?? BaseRSI;
-                if (theRsi == null)
-                {
-                    Logger.ErrorS(LogCategory,
-                        "Layer has no RSI to load states from. Cannot use 'state' property. ({0})",
-                        layerDatum.State);
-                }
-                else
-                {
-                    var stateid = new RSI.StateId(layerDatum.State);
-                    layer.State = stateid;
-                    if (theRsi.TryGetState(stateid, out var state))
-                    {
-                        // Always use south because this layer will be cached in the serializer.
-                        layer.AnimationTimeLeft = state.GetDelay(0);
-                    }
-                    else
-                    {
-                        Logger.ErrorS(LogCategory,
-                            $"State '{stateid}' not found in RSI: '{theRsi.Path}'.",
-                            stateid);
-                    }
-                }
-            }
-
-            if (!string.IsNullOrWhiteSpace(layerDatum.TexturePath))
-            {
-                anyTextureAttempted = true;
-                if (layer.State.IsValid)
-                {
-                    Logger.ErrorS(LogCategory,
-                        "Cannot specify 'texture' on a layer if it has an RSI state specified."
-                    );
-                }
-                else
-                {
-                    layer.Texture =
-                        resourceCache.GetResource<TextureResource>(TextureRoot / layerDatum.TexturePath);
-                }
-            }
-
-            if (!string.IsNullOrWhiteSpace(layerDatum.Shader))
-            {
-                if (prototypes.TryIndex<ShaderPrototype>(layerDatum.Shader, out var prototype))
-                {
-                    layer.ShaderPrototype = layerDatum.Shader;
-                    layer.Shader = prototype.Instance();
-                }
-                else
-                {
-                    Logger.ErrorS(LogCategory,
-                        "Shader prototype '{0}' does not exist.",
-                        layerDatum.Shader);
-                }
-            }
-
-            if (layerDatum.MapKeys != null)
-            {
-                foreach (var keyString in layerDatum.MapKeys)
-                {
-                    object key;
-                    if (reflection.TryParseEnumReference(keyString, out var @enum))
-                    {
-                        key = @enum;
-                    }
-                    else
-                    {
-                        key = keyString;
-                    }
-
-                    if (LayerMap.TryGetValue(key, out var mappedIndex))
-                    {
-                        if (mappedIndex != index)
-                            Logger.ErrorS(LogCategory, "Duplicate layer map key definition: {0}", key);
-                        continue;
-                    }
-
-                    _layerMapEnsurePrivate();
-                    LayerMap[key] = index;
-                }
-            }
-
-            layer.Color = layerDatum.Color;
-            layer._rotation = layerDatum.Rotation;
-            layer._offset = layerDatum.Offset;
-            layer._scale = layerDatum.Scale;
-            layer.UpdateLocalMatrix();
-
-            // If neither state: nor texture: were provided we assume that they want a blank invisible layer.
-            layer.Visible = anyTextureAttempted && layerDatum.Visible;
-        }
-
-        public void LayerSetData(object layerKey, PrototypeLayerData data)
-        {
-            if (!LayerMapTryGet(layerKey, out var layer))
-            {
-                Logger.ErrorS(LogCategory, "Layer with key '{0}' does not exist, cannot set shader! Trace:\n{1}",
-                    layerKey, Environment.StackTrace);
-                return;
-            }
-
-            LayerSetData(layer, data);
-        }
-
-        public void LayerSetShader(int layer, ShaderInstance? shader, string? prototype = null)
+        public void LayerSetShader(int layer, ShaderInstance? shader)
         {
             if (Layers.Count <= layer)
             {
@@ -738,10 +664,9 @@ namespace Robust.Client.GameObjects
 
             var theLayer = Layers[layer];
             theLayer.Shader = shader;
-            theLayer.ShaderPrototype = prototype;
         }
 
-        public void LayerSetShader(object layerKey, ShaderInstance shader, string? prototype = null)
+        public void LayerSetShader(object layerKey, ShaderInstance shader)
         {
             if (!LayerMapTryGet(layerKey, out var layer))
             {
@@ -750,7 +675,7 @@ namespace Robust.Client.GameObjects
                 return;
             }
 
-            LayerSetShader(layer, shader, prototype);
+            LayerSetShader(layer, shader);
         }
 
         public void LayerSetShader(int layer, string shaderName)
@@ -759,12 +684,10 @@ namespace Robust.Client.GameObjects
             {
                 Logger.ErrorS(LogCategory, "Shader prototype '{0}' does not exist. Trace:\n{1}", shaderName,
                     Environment.StackTrace);
-
-                LayerSetShader(layer, null, null);
-                return;
             }
 
-            LayerSetShader(layer, prototype.Instance(), shaderName);
+            // This will set the shader to null if it does not exist.
+            LayerSetShader(layer, prototype?.Instance());
         }
 
         public void LayerSetShader(object layerKey, string shaderName)
@@ -1225,7 +1148,7 @@ namespace Robust.Client.GameObjects
                 return;
             }
 
-            Layers[layer].Offset = layerOffset;
+            Layers[layer].SetOffset(layerOffset);
         }
 
         public void LayerSetOffset(object layerKey, Vector2 layerOffset)
@@ -1307,6 +1230,25 @@ namespace Robust.Client.GameObjects
             RenderInternal(drawingHandle, eyeRotation, worldRotation, worldPosition, overrideDir);
         }
 
+        private void CalcModelMatrix(int numDirs, Angle eyeRotation, Angle worldRotation, Vector2 worldPosition, out Matrix3 modelMatrix)
+        {
+            Angle angle;
+
+            if (_screenLock)
+            {
+                // Negate the eye rotation in the model matrix, so that later when the view matrix is applied the
+                // sprite will be locked upright to the screen
+                angle = new Angle(-eyeRotation.Theta);
+            }
+            else
+            {
+                angle = CalcRectWorldAngle(worldRotation + eyeRotation, numDirs) - eyeRotation;
+            }
+
+            var sWorldRotation = angle;
+            modelMatrix = Matrix3.CreateTransform(in worldPosition, in sWorldRotation);
+        }
+
         private void RenderInternal(DrawingHandleWorld drawingHandle, Angle eyeRotation, Angle worldRotation, Vector2 worldPosition, Direction? overrideDirection)
         {
             // Reduce the angles to fix math shenanigans
@@ -1315,16 +1257,56 @@ namespace Robust.Client.GameObjects
             if (worldRotation.Theta < 0)
                 worldRotation = new Angle(worldRotation.Theta + Math.Tau);
 
-            // worldRotation + eyeRotation should be the angle of the entity on-screen. If no-rot is enabled this is just set to zero.
-            // However, at some point later the eye-matrix is applied separately, so we subtract -eye rotation for now:
-            var entityMatrix = Matrix3.CreateTransform(worldPosition, NoRotation ? -eyeRotation : worldRotation);
+            // sprite matrix, WITHOUT offset.
+            // offset is applied after sprite numDirs snapping/rotation correction
+            // --> apply at same time as layer offset
+            var spriteMatrix = Matrix3.CreateTransform(Vector2.Zero, rotation, scale);
 
-            Matrix3.Multiply(ref LocalMatrix, ref entityMatrix, out var transform);
-
-            var angle = worldRotation + eyeRotation; // angle on-screen. Used to decide the direction of 4/8 directional RSIs
             foreach (var layer in Layers)
             {
-                layer.Render(drawingHandle, ref transform, angle, overrideDirection);
+                if (!layer.Visible)
+                {
+                    continue;
+                }
+
+                var numDirs = GetLayerDirectionCount(layer);
+                var layerRotation = worldRotation + layer.Rotation;
+                var layerPosition = worldPosition + layerRotation.RotateVec(layer._offset + offset);
+
+                CalcModelMatrix(numDirs, eyeRotation, layerRotation, layerPosition, out var modelMatrix);
+                Matrix3.Multiply(ref spriteMatrix, ref modelMatrix, out var transformMatrix);
+                drawingHandle.SetTransform(in transformMatrix);
+
+                RenderLayer(drawingHandle, layer, eyeRotation, layerRotation, overrideDirection);
+            }
+        }
+
+        private void RenderLayer(DrawingHandleWorld drawingHandle, Layer layer, Angle eyeRotation, Angle worldRotation, Direction? overrideDirection)
+        {
+            var texture = GetRenderTexture(layer, worldRotation + eyeRotation, overrideDirection);
+
+            if (layer.Shader != null)
+            {
+                drawingHandle.UseShader(layer.Shader);
+            }
+
+            var layerColor = color * layer.Color;
+
+            var position = -(Vector2)texture.Size / (2f * EyeManager.PixelsPerMeter);
+            var textureSize = texture.Size / (float)EyeManager.PixelsPerMeter;
+            var quad = Box2.FromDimensions(position, textureSize);
+
+            // TODO: Implement layer-specific rotation and scale.
+            // Apply these directly to the box.
+            // Oh and when you do update Layer.LocalToLayer so content doesn't break.
+
+            // handle.Modulate changes the color
+            // drawingHandle.SetTransform() is set above, turning the quad into local space vertices
+            drawingHandle.DrawTextureRectRegion(texture, quad, layerColor);
+
+            if (layer.Shader != null)
+            {
+                drawingHandle.UseShader(null);
             }
         }
 
@@ -1360,6 +1342,27 @@ namespace Robust.Client.GameObjects
             };
         }
 
+        private Texture GetRenderTexture(Layer layer, Angle worldRotation, Direction? overrideDirection)
+        {
+            var texture = layer.Texture;
+
+            if (layer.State.IsValid)
+            {
+                // Pull texture from RSI state instead.
+                var rsi = layer.RSI ?? BaseRSI;
+                if (rsi == null || !rsi.TryGetState(layer.State, out var state))
+                {
+                    state = GetFallbackState(resourceCache);
+                }
+
+                var layerSpecificDir = layer.EffectiveDirection(state, worldRotation, overrideDirection);
+                texture = state.GetFrame(layerSpecificDir, layer.AnimationFrame);
+            }
+
+            texture ??= resourceCache.GetFallback<TextureResource>().Texture;
+            return texture;
+        }
+
         public void FrameUpdate(float delta)
         {
             foreach (var t in Layers)
@@ -1414,14 +1417,12 @@ namespace Robust.Client.GameObjects
 
             Visible = thestate.Visible;
             DrawDepth = thestate.DrawDepth;
-            scale = thestate.Scale;
-            rotation = thestate.Rotation;
-            offset = thestate.Offset;
-            UpdateLocalMatrix();
+            Scale = thestate.Scale;
+            Rotation = thestate.Rotation;
+            Offset = thestate.Offset;
             Color = thestate.Color;
             RenderOrder = thestate.RenderOrder;
 
-
             if (thestate.BaseRsiPath != null && BaseRSI != null)
             {
                 if (resourceCache.TryGetResource<RSIResource>(TextureRoot / thestate.BaseRsiPath, out var res))
@@ -1437,8 +1438,43 @@ namespace Robust.Client.GameObjects
                 }
             }
 
-            // Maybe optimize this to NOT fully clear the layers. (see LayerDatums setter function)
-            LayerDatums = thestate.Layers;
+            // Maybe optimize this to NOT full clear.
+            Layers.Clear();
+            for (var i = 0; i < thestate.Layers.Count; i++)
+            {
+                var netlayer = thestate.Layers[i];
+                var layer = new Layer(this)
+                {
+                    // These are easy so do them here.
+                    Scale = netlayer.Scale,
+                    Rotation = netlayer.Rotation,
+                    Visible = netlayer.Visible,
+                    Color = netlayer.Color
+                };
+                Layers.Add(layer);
+
+                // Using the public API to handle errors.
+                // Probably slow as crap.
+                // Who am I kidding, DEFINITELY.
+                if (netlayer.Shader != null)
+                {
+                    LayerSetShader(i, netlayer.Shader);
+                }
+
+                if (netlayer.RsiPath != null)
+                {
+                    LayerSetRSI(i, netlayer.RsiPath);
+                }
+
+                if (netlayer.TexturePath != null)
+                {
+                    LayerSetTexture(i, netlayer.TexturePath);
+                }
+                else if (netlayer.State != null)
+                {
+                    LayerSetState(i, netlayer.State);
+                }
+            }
         }
 
         private void QueueUpdateIsInert()
@@ -1517,61 +1553,35 @@ namespace Robust.Client.GameObjects
         }
 
         /// <inheritdoc/>
-        public Box2Rotated CalculateRotatedBoundingBox(Vector2 worldPosition, Angle worldRotation, IEye? eye = null)
+        public Box2 CalculateBoundingBox(Vector2 worldPos)
         {
             // fast check for empty sprites
-            if (!Visible || Layers.Count == 0)
-            {
-                return new Box2Rotated(new Box2(worldPosition, worldPosition), Angle.Zero, worldPosition);
-            }
-
-            // We need to modify world rotation so that it lies between 0 and 2pi.
-            // This matters for 4 or 8 directional sprites deciding which quadrant (octant?) they lie in.
-            // the 0->2pi convention is set by the sprite-rendering code that selects the layers.
-            // See RenderInternal().
-
-            worldRotation = worldRotation.Reduced();
-            if (worldRotation.Theta < 0)
-                worldRotation = new Angle(worldRotation.Theta + Math.Tau);
-
-            eye ??= eyeManager.CurrentEye;
-
-            // Need relative angle on screen for determining the sprite rsi direction.
-            Angle relativeRotation = NoRotation
-                ? Angle.Zero
-                : worldRotation + eye.Rotation;
+            if (Layers.Count == 0)
+                return new Box2(worldPos, worldPos);
 
             // we need to calculate bounding box taking into account all nested layers
-            // because layers can have offsets, scale or rotation, we need to calculate a new BB
-            // based on lowest bottomLeft and highest topRight points from all layers
-            var box = Layers[0].CalculateBoundingBox(relativeRotation);
+            // because layers can have offsets, scale or rotation we need to calculate a new BB
+            // based on lowest bottomLeft and hightest topRight points from all layers
+            var box = Layers[0].CalculateBoundingBox();
 
             for (int i = 1; i < Layers.Count; i++)
             {
                 var layer = Layers[i];
-                if (!layer.Visible) continue;
-                var layerBB = layer.CalculateBoundingBox(relativeRotation);
+                var layerBB = layer.CalculateBoundingBox();
 
                 box = box.Union(layerBB);
             }
 
-            // Next, what we do is take the box2 and apply the sprite's transform, and then the entity's transform. We
-            // could do this via Matrix3.TransformBox, but that only yields bounding boxes. So instead we manually
-            // transform our box by the combination of these matrices:
+            // apply sprite transformations and calculate sprite bounding box
+            // we can optimize it a bit, if sprite doesn't have rotation
+            var spriteBox = box.Scale(Scale);
+            var spriteHasRotation = !Rotation.EqualsApprox(Angle.Zero);
+            var spriteBB = spriteHasRotation ?
+                new Box2Rotated(spriteBox, Rotation).CalcBoundingBox() : spriteBox;
 
-            if (Scale != Vector2.One)
-                box = box.Scale(Scale);
-
-            var adjustedOffset = NoRotation
-                ? (-eye.Rotation).RotateVec(Offset)
-                : worldRotation.RotateVec(Offset);
-
-            Vector2 position = adjustedOffset + worldPosition;
-            Angle finalRotation = NoRotation
-                ? Rotation - eye.Rotation
-                : Rotation + worldRotation;
-
-            return new Box2Rotated(box.Translated(position), finalRotation, position);
+            // move it all to world transform system (with sprite offset)
+            var worldBB = spriteBB.Translated(Offset + worldPos);
+            return worldBB;
         }
 
         internal void UpdateBounds()
@@ -1605,11 +1615,10 @@ namespace Robust.Client.GameObjects
             Flip = 3,
         }
 
-        public sealed class Layer : ISpriteLayer, ISerializationHooks
+        public sealed class Layer : ISpriteLayer
         {
             [ViewVariables] private readonly SpriteComponent _parent;
 
-            [ViewVariables] public string? ShaderPrototype;
             [ViewVariables] public ShaderInstance? Shader;
             [ViewVariables] public Texture? Texture;
 
@@ -1619,37 +1628,11 @@ namespace Robust.Client.GameObjects
             [ViewVariables] public float AnimationTime;
             [ViewVariables] public int AnimationFrame;
 
-            public Matrix3 LocalMatrix = Matrix3.Identity;
+            [ViewVariables(VVAccess.ReadWrite)]
+            public Vector2 Scale { get; set; } = Vector2.One;
 
             [ViewVariables(VVAccess.ReadWrite)]
-            public Vector2 Scale
-            {
-                get => _scale;
-                set
-                {
-                    if (_scale.EqualsApprox(value)) return;
-
-                    _scale = value;
-                    UpdateLocalMatrix();
-                    _parent.UpdateBounds();
-                }
-            }
-            internal Vector2 _scale = Vector2.One;
-
-            [ViewVariables(VVAccess.ReadWrite)]
-            public Angle Rotation
-            {
-                get => _rotation;
-                set
-                {
-                    if (_rotation.EqualsApprox(value)) return;
-
-                    _rotation = value;
-                    UpdateLocalMatrix();
-                    _parent.UpdateBounds();
-                }
-            }
-            internal Angle _rotation = Angle.Zero;
+            public Angle Rotation { get; set; }
 
             [ViewVariables(VVAccess.ReadWrite)]
             public bool Visible = true;
@@ -1669,7 +1652,6 @@ namespace Robust.Client.GameObjects
                     if (_offset.EqualsApprox(value)) return;
 
                     _offset = value;
-                    UpdateLocalMatrix();
                     _parent.UpdateBounds();
                 }
             }
@@ -1693,7 +1675,6 @@ namespace Robust.Client.GameObjects
                 if (toClone.Shader != null)
                 {
                     Shader = toClone.Shader.Mutable ? toClone.Shader.Duplicate() : toClone.Shader;
-                    ShaderPrototype = toClone.ShaderPrototype;
                 }
                 Texture = toClone.Texture;
                 RSI = toClone.RSI;
@@ -1701,26 +1682,14 @@ namespace Robust.Client.GameObjects
                 AnimationTimeLeft = toClone.AnimationTimeLeft;
                 AnimationTime = toClone.AnimationTime;
                 AnimationFrame = toClone.AnimationFrame;
-                _scale = toClone.Scale;
-                _rotation = toClone.Rotation;
-                _offset = toClone.Offset;
-                UpdateLocalMatrix();
+                Scale = toClone.Scale;
+                Rotation = toClone.Rotation;
                 Visible = toClone.Visible;
                 Color = toClone.Color;
                 DirOffset = toClone.DirOffset;
                 AutoAnimated = toClone.AutoAnimated;
             }
 
-            void ISerializationHooks.AfterDeserialization()
-            {
-                UpdateLocalMatrix();
-            }
-
-            internal void UpdateLocalMatrix()
-            {
-                LocalMatrix = Matrix3.CreateTransform(in _offset, in _rotation, in _scale);
-            }
-
             RSI? ISpriteLayer.Rsi { get => RSI; set => SetRsi(value); }
             RSI.StateId ISpriteLayer.RsiState { get => State; set => SetState(value); }
             Texture? ISpriteLayer.Texture { get => Texture; set => SetTexture(value); }
@@ -1732,7 +1701,7 @@ namespace Robust.Client.GameObjects
                     Color = Color,
                     Rotation = Rotation,
                     Scale = Scale,
-                    Shader = ShaderPrototype,
+                    //todo Shader = Shader,
                     State = State.Name,
                     Visible = Visible,
                     RsiPath = RSI?.Path?.ToString(),
@@ -1761,7 +1730,7 @@ namespace Robust.Client.GameObjects
                 set => SetAutoAnimated(value);
             }
 
-            public RSIDirection EffectiveDirection(Angle worldRotation)
+            public RSI.State.Direction EffectiveDirection(Angle worldRotation)
             {
                 if (State == default)
                 {
@@ -1782,16 +1751,22 @@ namespace Robust.Client.GameObjects
                 return default;
             }
 
-            public RSIDirection EffectiveDirection(RSI.State state, Angle worldRotation,
+            public Vector2 LocalToLayer(Vector2 localPos)
+            {
+                // TODO: scale & rotation for layers is currently unimplemented.
+                return localPos;
+            }
+
+            public RSI.State.Direction EffectiveDirection(RSI.State state, Angle worldRotation,
                 Direction? overrideDirection)
             {
                 if (state.Directions == RSI.State.DirectionType.Dir1)
                 {
-                    return RSIDirection.South;
+                    return RSI.State.Direction.South;
                 }
                 else
                 {
-                    RSIDirection dir;
+                    RSI.State.Direction dir;
                     if (overrideDirection != null)
                     {
                         dir = overrideDirection.Value.Convert(state.Directions);
@@ -1874,7 +1849,7 @@ namespace Robust.Client.GameObjects
                     }
                     else
                     {
-                        Logger.ErrorS(LogCategory, "State '{0}' does not exist in set RSI ({1}). Trace:\n{2}", State, rsi?.Path?.ToString() ?? "null",
+                        Logger.ErrorS(LogCategory, "State '{0}' does not exist in set RSI. Trace:\n{1}", State,
                             Environment.StackTrace);
                         Texture = null;
                     }
@@ -1923,6 +1898,11 @@ namespace Robust.Client.GameObjects
                 _parent.QueueUpdateIsInert();
             }
 
+            public void SetOffset(Vector2 offset)
+            {
+                Offset = offset;
+            }
+
             /// <inheritdoc/>
             public Vector2i PixelSize
             {
@@ -1943,121 +1923,10 @@ namespace Robust.Client.GameObjects
             }
 
             /// <inheritdoc/>
-            public Box2 CalculateBoundingBox(Angle angle)
+            public Box2 CalculateBoundingBox()
             {
-                // Other than some special cases for simple layers, this will basically just apply the matrix obtained
-                // via GetLayerDrawMatrix() to this layer's bounding box.
-
-                var rsiState = GetActualState();
-
-                var dir = (rsiState == null || rsiState.Directions == RSI.State.DirectionType.Dir1)
-                    ? RSIDirection.South
-                    : angle.ToRsiDirection(rsiState.Directions);
-
-                // special case for simple layers. The vast majority of layers are like this.
-                if (_rotation == Angle.Zero)
-                {
-                    var textureSize = PixelSize / EyeManager.PixelsPerMeter;
-
-                    // this switch block is basically an explicit version of the `rsiDirectionMatrix` in `GetLayerDrawMatrix()`.
-                    var box = dir switch
-                    {
-                        // No rotation:
-                        RSIDirection.South or RSIDirection.North => Box2.CenteredAround(Offset, textureSize),
-                        // rotate 90 degrees:
-                        RSIDirection.East or RSIDirection.West => Box2.CenteredAround(Offset, (textureSize.Y, textureSize.X)),
-                        // rotated 45 degrees (any 45 degree rotated rectangle has a square bounding box with sides of length (x+y)/sqrt(2) )
-                        _ => Box2.CenteredAround(Offset, Vector2.One * (textureSize.X + textureSize.Y) / MathF.Sqrt(2))
-                    };
-
-                    return _scale == Vector2.One ? box : box.Scale(_scale);
-                }
-
-                // Welp we have some non-zero _rotation, so lets just apply the generalized layer transform and get the bounding box from where;
-                GetLayerDrawMatrix(dir, out var layerDrawMatrix);
-                return layerDrawMatrix.TransformBox(Box2.CentredAroundZero(PixelSize / EyeManager.PixelsPerMeter));
-            }
-
-            internal RSI.State? GetActualState()
-            {
-                if (!State.IsValid)
-                    return null;
-
-                // Pull texture from RSI state
-                var rsi = RSI ?? _parent.BaseRSI;
-                if (rsi == null || !rsi.TryGetState(State, out var rsiState))
-                {
-                    rsiState = GetFallbackState(_parent.resourceCache);
-                }
-
-                return rsiState;
-            }
-
-            /// <summary>
-            ///     Given the apparent rotation of an entity on screen (world + eye rotation), get layer's matrix for drawing &
-            ///     relevant RSI direction.
-            /// </summary>
-            public void GetLayerDrawMatrix(RSIDirection dir, out Matrix3 layerDrawMatrix)
-            {
-                if (_parent.NoRotation)
-                    layerDrawMatrix = LocalMatrix;
-                else
-                {
-                    var rsiDirectionMatrix = Matrix3.CreateTransform(Vector2.Zero, -dir.Convert().ToAngle());
-                    Matrix3.Multiply(ref rsiDirectionMatrix, ref LocalMatrix, out layerDrawMatrix);
-                }
-            }
-
-            internal void Render(DrawingHandleWorld drawingHandle, ref Matrix3 spriteMatrix, Angle angle, Direction? overrideDirection)
-            {
-                if (!Visible)
-                    return;
-
-                var rsiState = GetActualState();
-
-                var dir = (rsiState == null || rsiState.Directions == RSI.State.DirectionType.Dir1)
-                    ? RSIDirection.South
-                    : angle.ToRsiDirection(rsiState.Directions);
-
-                // Set the drawing transform for this  layer
-                GetLayerDrawMatrix(dir, out var layerMatrix);
-                Matrix3.Multiply(ref layerMatrix, ref spriteMatrix, out var transformMatrix);
-                drawingHandle.SetTransform(in transformMatrix);
-
-                // The direction used to draw the sprite can differ from the one that the angle would naively suggest,
-                // due to direction overrides or offsets.
-                if (overrideDirection != null && rsiState != null)
-                    dir = overrideDirection.Value.Convert(rsiState.Directions);
-                dir = dir.OffsetRsiDir(DirOffset);
-
-                // Get the correct directional texture from the state, and draw it!
-                var texture = GetRenderTexture(rsiState, dir);
-                RenderTexture(drawingHandle, texture);
-            }
-
-            private void RenderTexture(DrawingHandleWorld drawingHandle, Texture texture)
-            {
-                if (Shader != null)
-                    drawingHandle.UseShader(Shader);
-
-                var layerColor = _parent.color * Color;
-
-                var position = -(Vector2)texture.Size / (2f * EyeManager.PixelsPerMeter);
-                var textureSize = texture.Size / (float)EyeManager.PixelsPerMeter;
-                var quad = Box2.FromDimensions(position, textureSize);
-
-                drawingHandle.DrawTextureRectRegion(texture, quad, layerColor);
-
-                if (Shader != null)
-                    drawingHandle.UseShader(null);
-            }
-
-            private Texture GetRenderTexture(RSI.State? state, RSIDirection dir)
-            {
-                if (state == null)
-                    return Texture ?? _parent.resourceCache.GetFallback<TextureResource>().Texture;
-
-                return state.GetFrame(dir, AnimationFrame);
+                // TODO: scale & rotation for layers is currently unimplemented.
+                return Box2.CenteredAround(Offset, PixelSize / EyeManager.PixelsPerMeter);
             }
         }
 
@@ -2165,7 +2034,6 @@ namespace Robust.Client.GameObjects
             return results;
         }
 
-        [Obsolete("Use SpriteSystem")]
         public static IRsiStateLike GetPrototypeIcon(EntityPrototype prototype, IResourceCache resourceCache)
         {
             var icon = IconComponent.GetPrototypeIcon(prototype, resourceCache);

Robust.Client/GameObjects/EntitySystems/AppearanceSystem.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
@@ -7,7 +6,7 @@ using Robust.Shared.GameStates;
 namespace Robust.Client.GameObjects
 {
     [UsedImplicitly]
-    public sealed class AppearanceSystem : SharedAppearanceSystem
+    internal sealed class AppearanceSystem : SharedAppearanceSystem
     {
         private readonly Queue<ClientAppearanceComponent> _queuedUpdates = new();
 
@@ -51,33 +50,10 @@ namespace Robust.Client.GameObjects
 
             if (!stateDiff) return;
 
-            component.AppearanceData = CloneAppearanceData(actualState.Data);
+            component.AppearanceData = actualState.Data;
             MarkDirty(component);
         }
 
-        /// <summary>
-        ///     Take in an appearance data dictionary and attempt to clone it.
-        /// </summary>
-        /// <remarks>
-        ///     As some appearance data values are not simple value-type objects, this is not just a shallow clone.
-        /// </remarks>
-        private Dictionary<object, object> CloneAppearanceData(Dictionary<object, object> data)
-        {
-            Dictionary<object, object> newDict = new(data.Count);
-
-            foreach (var (key, value) in data)
-            {
-                if (value.GetType().IsValueType)
-                    newDict[key] = value;
-                else if (value is ICloneable cloneable)
-                    newDict[key] = cloneable.Clone();
-                else
-                    throw new NotSupportedException("Invalid object in appearance data dictionary. Appearance data must be cloneable");
-            }
-
-            return newDict;
-        }
-
         public override void MarkDirty(AppearanceComponent component)
         {
             if (component.AppearanceDirty)
@@ -131,7 +107,7 @@ namespace Robust.Client.GameObjects
     [ByRefEvent]
     public struct AppearanceChangeEvent
     {
-        public AppearanceComponent Component;
-        public IReadOnlyDictionary<object, object> AppearanceData;
+        public AppearanceComponent Component = default!;
+        public IReadOnlyDictionary<object, object> AppearanceData = default!;
     }
 }

Robust.Client/GameObjects/EntitySystems/ContainerSystem.cs

@@ -168,7 +168,7 @@ namespace Robust.Client.GameObjects
                 // This container is expecting an entity... but it got parented to some other entity???
                 // Ah well, the sever should send a new container state that updates expected entities so just ignore it for now.
                 return;
-            }
+            }    
 
             RemoveExpectedEntity(message.Entity);
 
@@ -210,101 +210,68 @@ namespace Robust.Client.GameObjects
         public override void FrameUpdate(float frameTime)
         {
             base.FrameUpdate(frameTime);
-            var pointQuery = EntityManager.GetEntityQuery<PointLightComponent>();
-            var spriteQuery = EntityManager.GetEntityQuery<SpriteComponent>();
-            var xformQuery = EntityManager.GetEntityQuery<TransformComponent>();
 
             foreach (var toUpdate in _updateQueue)
             {
-                if (Deleted(toUpdate))
+                if (EntityManager.Deleted(toUpdate))
+                {
                     continue;
+                }
 
-                UpdateEntityRecursively(toUpdate, xformQuery, pointQuery, spriteQuery);
+                UpdateEntityRecursively(toUpdate);
             }
 
             _updateQueue.Clear();
         }
 
-        private void UpdateEntityRecursively(
-            EntityUid entity,
-            EntityQuery<TransformComponent> xformQuery,
-            EntityQuery<PointLightComponent> pointQuery,
-            EntityQuery<SpriteComponent> spriteQuery)
+        private void UpdateEntityRecursively(EntityUid entity)
         {
-            // Recursively go up parents and containers to see whether both sprites and lights need to be occluded
-            // Could maybe optimise this more by checking nearest parent that has sprite / light and whether it's container
-            // occluded but this probably isn't a big perf issue.
-            var xform = xformQuery.GetComponent(entity);
-            var parent = xform.ParentUid;
-            var child = entity;
-            var spriteOccluded = false;
-            var lightOccluded = false;
+            // TODO: Since we are recursing down,
+            // we could cache ShowContents data here to speed it up for children.
+            // Am lazy though.
+            UpdateEntity(entity);
 
-            while (parent.IsValid() && !spriteOccluded && !lightOccluded)
+            foreach (var child in EntityManager.GetComponent<TransformComponent>(entity).Children)
             {
-                var parentXform = xformQuery.GetComponent(parent);
-                if (TryComp<ContainerManagerComponent>(parent, out var manager) && manager.TryGetContainer(child, out var container))
-                {
-                    spriteOccluded = spriteOccluded || !container.ShowContents;
-                    lightOccluded = lightOccluded || container.OccludesLight;
-                }
-
-                child = parent;
-                parent = parentXform.ParentUid;
+                UpdateEntityRecursively(child.Owner);
             }
-
-            // Alright so
-            // This is the CBT bit.
-            // The issue is we need to go through the children and re-check whether they are or are not contained.
-            // if they are contained then the occlusion values may need updating for all those children
-            UpdateEntity(entity, xform, xformQuery, pointQuery, spriteQuery, spriteOccluded, lightOccluded);
         }
 
-        private void UpdateEntity(
-            EntityUid entity,
-            TransformComponent xform,
-            EntityQuery<TransformComponent> xformQuery,
-            EntityQuery<PointLightComponent> pointQuery,
-            EntityQuery<SpriteComponent> spriteQuery,
-            bool spriteOccluded,
-            bool lightOccluded)
+        private void UpdateEntity(EntityUid entity)
         {
-            if (spriteQuery.TryGetComponent(entity, out var sprite))
+            if (EntityManager.TryGetComponent(entity, out SpriteComponent? sprite))
             {
-                sprite.ContainerOccluded = spriteOccluded;
-            }
+                sprite.ContainerOccluded = false;
 
-            if (pointQuery.TryGetComponent(entity, out var light))
-            {
-                light.ContainerOccluded = lightOccluded;
-            }
-
-            var childEnumerator = xform.ChildEnumerator;
-
-            // Try to avoid TryComp if we already know stuff is occluded.
-            if ((!spriteOccluded || !lightOccluded) && TryComp<ContainerManagerComponent>(entity, out var manager))
-            {
-                while (childEnumerator.MoveNext(out var child))
+                // We have to recursively scan for containers upwards in case of nested containers.
+                var tempParent = entity;
+                while (tempParent.TryGetContainer(out var container))
                 {
-                    // Thank god it's by value and not by ref.
-                    var childSpriteOccluded = spriteOccluded;
-                    var childLightOccluded = lightOccluded;
-
-                    // We already know either sprite or light is not occluding so need to check container.
-                    if (manager.TryGetContainer(child.Value, out var container))
+                    if (!container.ShowContents)
                     {
-                        childSpriteOccluded = childSpriteOccluded || !container.ShowContents;
-                        childLightOccluded = childLightOccluded || container.OccludesLight;
+                        sprite.ContainerOccluded = true;
+                        break;
                     }
 
-                    UpdateEntity(child.Value, xformQuery.GetComponent(child.Value), xformQuery, pointQuery, spriteQuery, childSpriteOccluded, childLightOccluded);
+                    tempParent = container.Owner;
                 }
             }
-            else
+
+            if (EntityManager.TryGetComponent(entity, out PointLightComponent? light))
             {
-                while (childEnumerator.MoveNext(out var child))
+                light.ContainerOccluded = false;
+
+                // We have to recursively scan for containers upwards in case of nested containers.
+                var tempParent = entity;
+                while (tempParent.TryGetContainer(out var container))
                 {
-                    UpdateEntity(child.Value, xformQuery.GetComponent(child.Value), xformQuery, pointQuery, spriteQuery, spriteOccluded, lightOccluded);
+                    if (container.OccludesLight)
+                    {
+                        light.ContainerOccluded = true;
+                        break;
+                    }
+
+                    tempParent = container.Owner;
                 }
             }
         }

Robust.Client/GameObjects/EntitySystems/DebugLightTreeSystem.cs

@@ -25,7 +25,7 @@ namespace Robust.Client.GameObjects
                 if (_enabled)
                 {
                     _lightOverlay = new DebugLightOverlay(
-                        EntitySystem.Get<EntityLookupSystem>(),
+                        IoCManager.Resolve<IEntityLookup>(),
                         IoCManager.Resolve<IEyeManager>(),
                         IoCManager.Resolve<IMapManager>(),
                         Get<RenderingTreeSystem>());
@@ -44,7 +44,7 @@ namespace Robust.Client.GameObjects
 
         private sealed class DebugLightOverlay : Overlay
         {
-            private EntityLookupSystem _lookup;
+            private IEntityLookup _lookup;
             private IEyeManager _eyeManager;
             private IMapManager _mapManager;
 
@@ -52,7 +52,7 @@ namespace Robust.Client.GameObjects
 
             public override OverlaySpace Space => OverlaySpace.WorldSpace;
 
-            public DebugLightOverlay(EntityLookupSystem lookup, IEyeManager eyeManager, IMapManager mapManager, RenderingTreeSystem tree)
+            public DebugLightOverlay(IEntityLookup lookup, IEyeManager eyeManager, IMapManager mapManager, RenderingTreeSystem tree)
             {
                 _lookup = lookup;
                 _eyeManager = eyeManager;
@@ -72,7 +72,7 @@ namespace Robust.Client.GameObjects
                 {
                     foreach (var light in tree.LightTree)
                     {
-                        var aabb = _lookup.GetWorldAABB(light.Owner);
+                        var aabb = _lookup.GetWorldAabbFromEntity(light.Owner);
                         if (!aabb.Intersects(worldBounds)) continue;
 
                         args.WorldHandle.DrawRect(aabb, Color.Green.WithAlpha(0.1f));

Robust.Client/GameObjects/EntitySystems/EffectSystem.cs

@@ -323,7 +323,7 @@ namespace Robust.Client.GameObjects
         {
             private readonly IPlayerManager _playerManager;
 
-            public override OverlaySpace Space => OverlaySpace.WorldSpaceBelowFOV;
+            public override OverlaySpace Space => OverlaySpace.WorldSpace;
 
             private readonly ShaderInstance _unshadedShader;
             private readonly EffectSystem _owner;
@@ -377,9 +377,6 @@ namespace Robust.Client.GameObjects
                         (attachedXform?.Coordinates ?? effect.Coordinates)
                         .Offset(effect.AttachedOffset);
 
-                    // If we've never seen the entity before then can't resolve coordinates.
-                    if (!coordinates.IsValid(_entityManager)) continue;
-
                     // ???
                     var rotation = attachedXform?.WorldRotation ?? _entityManager.GetComponent<TransformComponent>(coordinates.EntityId).WorldRotation;
 

Robust.Client/GameObjects/EntitySystems/GridRenderingSystem.cs

@@ -1,19 +0,0 @@
-using Robust.Client.Graphics;
-using Robust.Shared.GameObjects;
-
-namespace Robust.Client.GameObjects;
-
-internal class GridRenderingSystem : EntitySystem
-{
-    private readonly IClydeInternal _clyde;
-
-    public GridRenderingSystem(IClydeInternal clyde)
-    {
-        _clyde = clyde;
-    }
-
-    public override void Initialize()
-    {
-        _clyde.RegisterGridEcsEvents();
-    }
-}

Robust.Client/GameObjects/EntitySystems/InputSystem.cs

@@ -4,15 +4,11 @@ using Robust.Client.Input;
 using Robust.Client.Player;
 using Robust.Shared;
 using Robust.Shared.Configuration;
-using Robust.Shared.Console;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Input;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
-using Robust.Shared.Map;
-using Robust.Shared.Maths;
 using Robust.Shared.Players;
-using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
 namespace Robust.Client.GameObjects
@@ -25,8 +21,6 @@ namespace Robust.Client.GameObjects
         [Dependency] private readonly IInputManager _inputManager = default!;
         [Dependency] private readonly IPlayerManager _playerManager = default!;
         [Dependency] private readonly IClientGameStateManager _stateManager = default!;
-        [Dependency] private readonly IConsoleHost _conHost = default!;
-        [Dependency] private readonly IGameTiming _timing = default!;
 
         private readonly IPlayerCommandStates _cmdStates = new PlayerCommandStates();
 
@@ -114,43 +108,6 @@ namespace Robust.Client.GameObjects
         public override void Initialize()
         {
             SubscribeLocalEvent<PlayerAttachSysMessage>(OnAttachedEntityChanged);
-
-            _conHost.RegisterCommand("incmd",
-                "Inserts an input command into the simulation",
-                "incmd <KeyFunction> <d|u KeyState> <wxPos> <wyPos>",
-                GenerateInputCommand);
-        }
-
-        public override void Shutdown()
-        {
-            base.Shutdown();
-
-            _conHost.UnregisterCommand("incmd");
-        }
-
-        private void GenerateInputCommand(IConsoleShell shell, string argstr, string[] args)
-        {
-            var localPlayer = _playerManager.LocalPlayer;
-            if(localPlayer is null)
-                return;
-
-            var pent = localPlayer.ControlledEntity;
-            if(pent is null)
-                return;
-
-            BoundKeyFunction keyFunction = new BoundKeyFunction(args[0]);
-            BoundKeyState state = args[1] == "u" ? BoundKeyState.Up: BoundKeyState.Down;
-
-            var pxform = Transform(pent.Value);
-            var wPos = pxform.WorldPosition + new Vector2(float.Parse(args[2]), float.Parse(args[3]));
-            var coords = EntityCoordinates.FromMap(EntityManager, pent.Value, new MapCoordinates(wPos, pxform.MapID));
-
-            var funcId = _inputManager.NetworkBindMap.KeyFunctionID(keyFunction);
-
-            var message = new FullInputCmdMessage(_timing.CurTick, _timing.TickFraction, funcId, state,
-                coords, new ScreenCoordinates(0, 0, default), EntityUid.Invalid);
-
-            HandleInputCommand(localPlayer.Session, keyFunction, message);
         }
 
         private void OnAttachedEntityChanged(PlayerAttachSysMessage message)

Robust.Client/GameObjects/EntitySystems/RenderingTreeSystem.cs

@@ -70,9 +70,8 @@ namespace Robust.Client.GameObjects
             UpdatesAfter.Add(typeof(TransformSystem));
             UpdatesAfter.Add(typeof(PhysicsSystem));
 
-            SubscribeLocalEvent<MapChangedEvent>(MapManagerOnMapCreated);
-
-            SubscribeLocalEvent<GridInitializeEvent>(MapManagerOnGridCreated);
+            _mapManager.MapCreated += MapManagerOnMapCreated;
+            _mapManager.OnGridCreated += MapManagerOnGridCreated;
 
             // Due to how recursion works, this must be done.
             SubscribeLocalEvent<MoveEvent>(AnythingMoved);
@@ -114,18 +113,12 @@ namespace Robust.Client.GameObjects
 
         private void AnythingMoved(ref MoveEvent args)
         {
-            var pointQuery = EntityManager.GetEntityQuery<PointLightComponent>();
-            var spriteQuery = EntityManager.GetEntityQuery<SpriteComponent>();
-            var xformQuery = EntityManager.GetEntityQuery<TransformComponent>();
+            var xforms = EntityManager.GetEntityQuery<TransformComponent>();
 
-            AnythingMovedSubHandler(args.Sender, xformQuery, pointQuery, spriteQuery);
+            AnythingMovedSubHandler(args.Sender, xforms);
         }
 
-        private void AnythingMovedSubHandler(
-            EntityUid uid,
-            EntityQuery<TransformComponent> xformQuery,
-            EntityQuery<PointLightComponent> pointQuery,
-            EntityQuery<SpriteComponent> spriteQuery)
+        private void AnythingMovedSubHandler(EntityUid uid, EntityQuery<TransformComponent> xforms)
         {
             // To avoid doing redundant updates (and we don't need to update a grid's children ever)
             if (!_checkedChildren.Add(uid) || EntityManager.HasComponent<RenderingTreeComponent>(uid)) return;
@@ -134,19 +127,17 @@ namespace Robust.Client.GameObjects
             // WHATEVER YOU DO, DON'T REPLACE THIS WITH SPAMMING EVENTS UNLESS YOU HAVE A GUARANTEE IT WON'T LAG THE GC.
             // (Struct-based events ok though)
             // Ironically this was lagging the GC lolz
-            if (spriteQuery.TryGetComponent(uid, out var sprite))
+            if (EntityManager.TryGetComponent(uid, out SpriteComponent? sprite))
                 QueueSpriteUpdate(sprite);
 
-            if (pointQuery.TryGetComponent(uid, out var light))
+            if (EntityManager.TryGetComponent(uid, out PointLightComponent? light))
                 QueueLightUpdate(light);
 
-            if (!xformQuery.TryGetComponent(uid, out var xform)) return;
+            if (!xforms.TryGetComponent(uid, out var xform)) return;
 
-            var childEnumerator = xform.ChildEnumerator;
-
-            while (childEnumerator.MoveNext(out var child))
+            foreach (var child in xform.ChildEntities)
             {
-                AnythingMovedSubHandler(child.Value, xformQuery, pointQuery, spriteQuery);
+                AnythingMovedSubHandler(child, xforms);
             }
         }
 
@@ -221,6 +212,13 @@ namespace Robust.Client.GameObjects
         }
         #endregion
 
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            _mapManager.MapCreated -= MapManagerOnMapCreated;
+            _mapManager.OnGridCreated -= MapManagerOnGridCreated;
+        }
+
         private void OnTreeRemove(EntityUid uid, RenderingTreeComponent component, ComponentRemove args)
         {
             foreach (var sprite in component.SpriteTree)
@@ -237,9 +235,9 @@ namespace Robust.Client.GameObjects
             component.LightTree.Clear();
         }
 
-        private void MapManagerOnMapCreated(MapChangedEvent e)
+        private void MapManagerOnMapCreated(object? sender, MapEventArgs e)
         {
-            if (e.Destroyed || e.Map == MapId.Nullspace)
+            if (e.Map == MapId.Nullspace)
             {
                 return;
             }
@@ -247,9 +245,9 @@ namespace Robust.Client.GameObjects
             EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetMapEntityId(e.Map));
         }
 
-        private void MapManagerOnGridCreated(GridInitializeEvent ev)
+        private void MapManagerOnGridCreated(MapId mapId, GridId gridId)
         {
-            EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetGrid(ev.GridId).GridEntityId);
+            EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetGrid(gridId).GridEntityId);
         }
 
         private RenderingTreeComponent? GetRenderTree(EntityUid entity, EntityQuery<TransformComponent> xforms)
@@ -371,10 +369,13 @@ namespace Robust.Client.GameObjects
         private Box2 SpriteAabbFunc(in SpriteComponent value)
         {
             var xforms = EntityManager.GetEntityQuery<TransformComponent>();
+
             var xform = xforms.GetComponent(value.Owner);
             var (worldPos, worldRot) = xform.GetWorldPositionRotation();
+            var bounds = new Box2Rotated(value.CalculateBoundingBox(worldPos), worldRot, worldPos);
+            var tree = GetRenderTree(value.Owner, xforms);
 
-            return SpriteAabbFunc(value, worldPos, worldRot, xforms);
+            return tree == null ? bounds.CalcBoundingBox() : xforms.GetComponent(tree.Owner).InvWorldMatrix.TransformBox(bounds);
         }
 
         private Box2 LightAabbFunc(in PointLightComponent value)
@@ -391,7 +392,7 @@ namespace Robust.Client.GameObjects
 
         private Box2 SpriteAabbFunc(SpriteComponent value, Vector2 worldPos, Angle worldRot, EntityQuery<TransformComponent> xforms)
         {
-            var bounds = value.CalculateRotatedBoundingBox(worldPos, worldRot);
+            var bounds = new Box2Rotated(value.CalculateBoundingBox(worldPos), worldRot, worldPos);
             var tree = GetRenderTree(value.Owner, xforms);
 
             return tree == null ? bounds.CalcBoundingBox() : xforms.GetComponent(tree.Owner).InvWorldMatrix.TransformBox(bounds);

Robust.Client/GameObjects/EntitySystems/SpriteSystem.Specifier.cs

@@ -1,84 +0,0 @@
-using System;
-using JetBrains.Annotations;
-using Robust.Client.Graphics;
-using Robust.Client.ResourceManagement;
-using Robust.Client.Utility;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Log;
-using Robust.Shared.Map;
-using Robust.Shared.Prototypes;
-using Robust.Shared.Utility;
-
-namespace Robust.Client.GameObjects;
-
-public sealed partial class SpriteSystem
-{
-    [Dependency] private readonly IPrototypeManager _proto = default!;
-    [Dependency] private readonly IResourceCache _resourceCache = default!;
-
-    [Pure]
-    public Texture Frame0(SpriteSpecifier specifier)
-    {
-        return RsiStateLike(specifier).Default;
-    }
-
-    [Pure]
-    public IRsiStateLike RsiStateLike(SpriteSpecifier specifier)
-    {
-        switch (specifier)
-        {
-            case SpriteSpecifier.Texture tex:
-                return tex.GetTexture(_resourceCache);
-
-            case SpriteSpecifier.Rsi rsi:
-                return GetState(rsi);
-
-            case SpriteSpecifier.EntityPrototype prototypeIcon:
-                if (!_proto.TryIndex<EntityPrototype>(prototypeIcon.EntityPrototypeId, out var prototype))
-                {
-                    Logger.Error("Failed to load PrototypeIcon {0}", prototypeIcon.EntityPrototypeId);
-                    return SpriteComponent.GetFallbackState(_resourceCache);
-                }
-
-                return SpriteComponent.GetPrototypeIcon(prototype, _resourceCache);
-
-            default:
-                throw new NotSupportedException();
-        }
-    }
-
-    [Pure]
-    public IRsiStateLike GetPrototypeIcon(EntityPrototype prototype, IResourceCache resourceCache)
-    {
-        var icon = IconComponent.GetPrototypeIcon(prototype, _resourceCache);
-        if (icon != null) return icon;
-
-        if (!prototype.Components.ContainsKey("Sprite"))
-        {
-            return SpriteComponent.GetFallbackState(resourceCache);
-        }
-
-        var dummy = Spawn(prototype.ID, MapCoordinates.Nullspace);
-        var spriteComponent = EnsureComp<SpriteComponent>(dummy);
-        var result = spriteComponent.Icon ?? SpriteComponent.GetFallbackState(resourceCache);
-        Del(dummy);
-
-        return result;
-    }
-
-    [Pure]
-    public RSI.State GetState(SpriteSpecifier.Rsi rsiSpecifier)
-    {
-        if (_resourceCache.TryGetResource<RSIResource>(
-                SharedSpriteComponent.TextureRoot / rsiSpecifier.RsiPath,
-                out var theRsi) &&
-            theRsi.RSI.TryGetState(rsiSpecifier.RsiState, out var state))
-        {
-            return state;
-        }
-
-        Logger.Error("Failed to load RSI {0}", rsiSpecifier.RsiPath);
-        return SpriteComponent.GetFallbackState(_resourceCache);
-    }
-}

Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

@@ -11,7 +11,7 @@ namespace Robust.Client.GameObjects
     /// Updates the layer animation for every visible sprite.
     /// </summary>
     [UsedImplicitly]
-    public sealed partial class SpriteSystem : EntitySystem
+    public sealed class SpriteSystem : EntitySystem
     {
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly RenderingTreeSystem _treeSystem = default!;

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -45,6 +45,7 @@ namespace Robust.Client.GameStates
 
         [Dependency] private readonly IComponentFactory _compFactory = default!;
         [Dependency] private readonly IClientEntityManagerInternal _entities = default!;
+        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IPlayerManager _players = default!;
         [Dependency] private readonly IClientNetManager _network = default!;
         [Dependency] private readonly IBaseClient _client = default!;
@@ -331,6 +332,8 @@ namespace Robust.Client.GameStates
             }
 
             _entities.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: !IsPredictionEnabled);
+
+            _lookup.Update();
         }
 
         private void ResetPredictedEntities(GameTick curTick)
@@ -421,6 +424,7 @@ namespace Robust.Client.GameStates
             var createdEntities = ApplyEntityStates(curState.EntityStates.Span, curState.EntityDeletions.Span,
                 nextState != null ? nextState.EntityStates.Span : default);
             _players.ApplyPlayerStates(curState.PlayerStates.Value ?? Array.Empty<PlayerState>());
+            _mapManager.ApplyGameStatePost(curState.MapData);
 
             GameStateApplied?.Invoke(new GameStateAppliedArgs(curState));
             return createdEntities;

Robust.Client/Graphics/Audio/ClydeAudio.AudioSources.cs

@@ -15,7 +15,6 @@ using Robust.Shared.IoC;
 using Robust.Shared.Audio;
 using Robust.Shared.Log;
 using Vector2 = Robust.Shared.Maths.Vector2;
-using Robust.Shared.Utility;
 
 namespace Robust.Client.Graphics.Audio
 {
@@ -194,10 +193,8 @@ namespace Robust.Client.Graphics.Audio
                 {
                     _didPositionWarning = true;
                     Logger.WarningS("clyde.oal",
-                        "Attempting to set position on audio source with multiple audio channels! Stream: '{0}'.  Make sure the audio is MONO, not stereo.",
+                        "Attempting to set position on audio source with multiple audio channels! Stream: '{0}'",
                         _sourceStream.Name);
-                    // warning isn't enough, people just ignore it :(
-                    DebugTools.Assert(false, $"Attempting to set position on audio source with multiple audio channels! Stream: '{_sourceStream.Name}'. Make sure the audio is MONO, not stereo.");
                 }
 #endif
 

Robust.Client/Graphics/Clyde/Clyde.GridRendering.cs

@@ -1,5 +1,7 @@
 using System;
+using System.Buffers;
 using System.Collections.Generic;
+using System.Diagnostics;
 using OpenToolkit.Graphics.OpenGL4;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
@@ -16,8 +18,8 @@ namespace Robust.Client.Graphics.Clyde
         private readonly Dictionary<GridId, Dictionary<Vector2i, MapChunkData>> _mapChunkData =
             new();
 
-        private int _verticesPerChunk(MapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * 4;
-        private int _indicesPerChunk(MapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * GetQuadBatchIndexCount();
+        private int _verticesPerChunk(IMapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * 4;
+        private int _indicesPerChunk(IMapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * GetQuadBatchIndexCount();
 
         private void _drawGrids(Viewport viewport, Box2Rotated worldBounds, IEye eye)
         {
@@ -76,7 +78,7 @@ namespace Robust.Client.Graphics.Clyde
             }
         }
 
-        private void _updateChunkMesh(IMapGrid grid, MapChunk chunk)
+        private void _updateChunkMesh(IMapGrid grid, IMapChunk chunk)
         {
             var data = _mapChunkData[grid.Index];
 
@@ -89,41 +91,25 @@ namespace Robust.Client.Graphics.Clyde
             Span<Vertex2D> vertexBuffer = stackalloc Vertex2D[_verticesPerChunk(chunk)];
 
             var i = 0;
-            var cSz = grid.ChunkSize;
-            var cScaled = chunk.Indices * cSz;
-            for (ushort x = 0; x < cSz; x++)
+            foreach (var tile in chunk)
             {
-                for (ushort y = 0; y < cSz; y++)
+                var regionMaybe = _tileDefinitionManager.TileAtlasRegion(tile.Tile);
+                if (regionMaybe == null)
                 {
-                    var tile = chunk.GetTile(x, y);
-                    if (tile.IsEmpty)
-                        continue;
-
-                    var regionMaybe = _tileDefinitionManager.TileAtlasRegion(tile);
-
-                    Box2 region;
-                    if (regionMaybe == null || regionMaybe.Length <= tile.Variant)
-                    {
-                        region = _tileDefinitionManager.ErrorTileRegion;
-                    }
-                    else
-                    {
-                        region = regionMaybe[tile.Variant];
-                    }
-
-                    var gx = x + cScaled.X;
-                    var gy = y + cScaled.Y;
-
-                    var vIdx = i * 4;
-                    vertexBuffer[vIdx + 0] = new Vertex2D(gx, gy, region.Left, region.Bottom);
-                    vertexBuffer[vIdx + 1] = new Vertex2D(gx + 1, gy, region.Right, region.Bottom);
-                    vertexBuffer[vIdx + 2] = new Vertex2D(gx + 1, gy + 1, region.Right, region.Top);
-                    vertexBuffer[vIdx + 3] = new Vertex2D(gx, gy + 1, region.Left, region.Top);
-                    var nIdx = i * GetQuadBatchIndexCount();
-                    var tIdx = (ushort)(i * 4);
-                    QuadBatchIndexWrite(indexBuffer, ref nIdx, tIdx);
-                    i += 1;
+                    continue;
                 }
+
+                var region = regionMaybe.Value;
+
+                var vIdx = i * 4;
+                vertexBuffer[vIdx + 0] = new Vertex2D(tile.X, tile.Y, region.Left, region.Bottom);
+                vertexBuffer[vIdx + 1] = new Vertex2D(tile.X + 1, tile.Y, region.Right, region.Bottom);
+                vertexBuffer[vIdx + 2] = new Vertex2D(tile.X + 1, tile.Y + 1, region.Right, region.Top);
+                vertexBuffer[vIdx + 3] = new Vertex2D(tile.X, tile.Y + 1, region.Left, region.Top);
+                var nIdx = i * GetQuadBatchIndexCount();
+                var tIdx = (ushort) (i * 4);
+                QuadBatchIndexWrite(indexBuffer, ref nIdx, tIdx);
+                i += 1;
             }
 
             GL.BindVertexArray(datum.VAO);
@@ -136,7 +122,7 @@ namespace Robust.Client.Graphics.Clyde
             datum.TileCount = i;
         }
 
-        private MapChunkData _initChunkBuffers(IMapGrid grid, MapChunk chunk)
+        private MapChunkData _initChunkBuffers(IMapGrid grid, IMapChunk chunk)
         {
             var vao = GenVertexArray();
             BindVertexArray(vao);
@@ -173,7 +159,7 @@ namespace Robust.Client.Graphics.Clyde
             return datum;
         }
 
-        private bool _isChunkDirty(IMapGrid grid, MapChunk chunk)
+        private bool _isChunkDirty(IMapGrid grid, IMapChunk chunk)
         {
             var data = _mapChunkData[grid.Index];
             return !data.TryGetValue(chunk.Indices, out var datum) || datum.Dirty;
@@ -189,7 +175,7 @@ namespace Robust.Client.Graphics.Clyde
             // Don't need to set it if we don't have an entry since lack of an entry is treated as dirty.
         }
 
-        private void _updateOnGridModified(GridModifiedEvent args)
+        private void _updateOnGridModified(object? sender, GridChangedEventArgs args)
         {
             foreach (var (pos, _) in args.Modified)
             {
@@ -199,23 +185,21 @@ namespace Robust.Client.Graphics.Clyde
             }
         }
 
-        private void _updateTileMapOnUpdate(TileChangedEvent args)
+        private void _updateTileMapOnUpdate(object? sender, TileChangedEventArgs args)
         {
             var grid = _mapManager.GetGrid(args.NewTile.GridIndex);
             var chunk = grid.GridTileToChunkIndices(new Vector2i(args.NewTile.X, args.NewTile.Y));
             _setChunkDirty(grid, chunk);
         }
 
-        private void _updateOnGridCreated(GridStartupEvent ev)
+        private void _updateOnGridCreated(MapId mapId, GridId gridId)
         {
-            var gridId = ev.GridId;
             Logger.DebugS("grid", $"Adding {gridId} to grid renderer");
             _mapChunkData.Add(gridId, new Dictionary<Vector2i, MapChunkData>());
         }
 
-        private void _updateOnGridRemoved(GridRemovalEvent ev)
+        private void _updateOnGridRemoved(MapId mapId, GridId gridId)
         {
-            var gridId = ev.GridId;
             Logger.DebugS("grid", $"Removing {gridId} from grid renderer");
 
             var data = _mapChunkData[gridId];

Robust.Client/Graphics/Clyde/Clyde.HLR.cs

@@ -24,17 +24,11 @@ namespace Robust.Client.Graphics.Clyde
     {
         public ClydeDebugLayers DebugLayers { get; set; }
 
-        private readonly RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRotation, Box2 spriteScreenBB)>
+        private readonly RefList<(SpriteComponent sprite, Matrix3 worldMatrix, Angle worldRotation, float yWorldPos)>
             _drawingSpriteList
                 =
                 new();
 
-        // TODO allow this scale to be passed with PostShader as variable
-        /// <summary>
-        ///     Some shaders that enlarge the final sprite, like emission or highlight effects, need to use a slightly larger render target.
-        /// </summary>
-        public static float PostShadeScale = 1.25f;
-
         public void Render()
         {
             CheckTransferringScreenshots();
@@ -223,8 +217,9 @@ namespace Robust.Client.Graphics.Clyde
             RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowEntities, worldAABB, worldBounds);
 
             var screenSize = viewport.Size;
+            eye.GetViewMatrix(out var eyeMatrix, eye.Scale);
 
-            ProcessSpriteEntities(mapId, viewport, eye, worldBounds, _drawingSpriteList);
+            ProcessSpriteEntities(mapId, eyeMatrix, worldBounds, _drawingSpriteList);
 
             var worldOverlays = new List<Overlay>();
 
@@ -281,12 +276,30 @@ namespace Robust.Client.Graphics.Clyde
                     break;
                 }
 
+                var matrix = entry.worldMatrix;
+                var worldPosition = new Vector2(matrix.R0C2, matrix.R1C2);
+
                 RenderTexture? entityPostRenderTarget = null;
                 Vector2i roundedPos = default;
                 if (entry.sprite.PostShader != null)
                 {
-                    // get the size of the sprite on screen, scaled slightly to allow for shaders that increase the final sprite size.
-                    var screenSpriteSize = (Vector2i) (entry.spriteScreenBB.Size * PostShadeScale).Rounded();
+                    // calculate world bounding box
+                    var spriteBB = entry.sprite.CalculateBoundingBox(worldPosition);
+                    var spriteLB = spriteBB.BottomLeft;
+                    var spriteRT = spriteBB.TopRight;
+
+                    // finally we can calculate screen bounding in pixels
+                    var screenLB = viewport.WorldToLocal(spriteLB);
+                    var screenRT = viewport.WorldToLocal(spriteRT);
+
+                    // we need to scale RT a for effects like emission or highlight
+                    // scale can be passed with PostShader as variable in future
+                    var postShadeScale = 1.25f;
+                    var screenSpriteSize = (Vector2i) ((screenRT - screenLB) * postShadeScale).Rounded();
+
+                    // Rotate the vector by the eye angle, otherwise the bounding box will be incorrect
+                    screenSpriteSize = (Vector2i) eye.Rotation.RotateVec(screenSpriteSize).Rounded();
+                    screenSpriteSize.Y = -screenSpriteSize.Y;
 
                     // I'm not 100% sure why it works, but without it post-shader
                     // can be lower or upper by 1px than original sprite depending on sprite rotation or scale
@@ -309,14 +322,16 @@ namespace Robust.Client.Graphics.Clyde
                         // Calculate viewport so that the entity thinks it's drawing to the same position,
                         // which is necessary for light application,
                         // but it's ACTUALLY drawing into the center of the render target.
-                        roundedPos = (Vector2i) entry.spriteScreenBB.Center;
-                        var flippedPos = new Vector2i(roundedPos.X, screenSize.Y - roundedPos.Y);
+                        var spritePos = spriteBB.Center;
+                        var screenPos = viewport.WorldToLocal(spritePos);
+                        var (roundedX, roundedY) = roundedPos = (Vector2i) screenPos;
+                        var flippedPos = new Vector2i(roundedX, screenSize.Y - roundedY);
                         flippedPos -= entityPostRenderTarget.Size / 2;
                         _renderHandle.Viewport(Box2i.FromDimensions(-flippedPos, screenSize));
                     }
                 }
 
-                entry.sprite.Render(_renderHandle.DrawingHandleWorld, eye.Rotation, in entry.worldRotation, in entry.worldPos);
+                entry.sprite.Render(_renderHandle.DrawingHandleWorld, eye.Rotation, in entry.worldRotation, in worldPosition);
 
                 if (entry.sprite.PostShader != null && entityPostRenderTarget != null)
                 {
@@ -354,26 +369,17 @@ namespace Robust.Client.Graphics.Clyde
         }
 
         [MethodImpl(MethodImplOptions.NoInlining)]
-        private void ProcessSpriteEntities(MapId map, Viewport view, IEye eye, Box2Rotated worldBounds,
-            RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRot, Box2 spriteScreenBB)> list)
+        private void ProcessSpriteEntities(MapId map, Matrix3 eyeMatrix, Box2Rotated worldBounds,
+            RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> list)
         {
             var xforms = _entityManager.GetEntityQuery<TransformComponent>();
 
-            // Construct a matrix equivalent for Viewport.WorldToLocal()
-            eye.GetViewMatrix(out var viewMatrix, view.RenderScale);
-            var uiProjmatrix = Matrix3.Identity;
-            uiProjmatrix.R0C0 = EyeManager.PixelsPerMeter;
-            uiProjmatrix.R1C1 = -EyeManager.PixelsPerMeter;
-            uiProjmatrix.R0C2 = view.Size.X / 2f;
-            uiProjmatrix.R1C2 = view.Size.Y / 2f;
-            var worldToLocal = viewMatrix * uiProjmatrix;
-
             foreach (var comp in _entitySystemManager.GetEntitySystem<RenderingTreeSystem>().GetRenderTrees(map, worldBounds))
             {
                 var bounds = xforms.GetComponent(comp.Owner).InvWorldMatrix.TransformBox(worldBounds);
 
                 comp.SpriteTree.QueryAabb(ref list, (
-                    ref RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRot, Box2 spriteScreenBB)> state,
+                    ref RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> state,
                     in SpriteComponent value) =>
                 {
                     var entity = value.Owner;
@@ -381,10 +387,12 @@ namespace Robust.Client.Graphics.Clyde
 
                     ref var entry = ref state.AllocAdd();
                     entry.sprite = value;
-                    (entry.worldPos, entry.worldRot) = transform.GetWorldPositionRotation();
-
-                    var spriteWorldBB = value.CalculateRotatedBoundingBox(entry.worldPos, entry.worldRot, eye);
-                    entry.spriteScreenBB = worldToLocal.TransformBox(spriteWorldBB);
+                    Vector2 worldPos;
+                    (worldPos, entry.worldRot, entry.matrix) = transform.GetWorldPositionRotationMatrix();
+                    var eyePos = eyeMatrix.Transform(worldPos);
+                    // Didn't use the bounds from the query as that has to be re-calculated (and is probably more expensive than this).
+                    var bounds = value.CalculateBoundingBox(eyePos);
+                    entry.yWorldPos = eyePos.Y - bounds.Extents.Y;
                     return true;
 
                 }, bounds, true);

Robust.Client/Graphics/Clyde/Clyde.LightRendering.cs

@@ -514,14 +514,14 @@ namespace Robust.Client.Graphics.Clyde
             var enlargedBounds = worldAABB.Enlarged(renderingTreeSystem.MaxLightRadius);
 
             // Use worldbounds for this one as we only care if the light intersects our actual bounds
-            var state = (this, worldAABB, count: 0, shadowCastingCount: 0);
+            var state = (this, worldAABB, count: 0);
             var xforms = _entityManager.GetEntityQuery<TransformComponent>();
 
             foreach (var comp in renderingTreeSystem.GetRenderTrees(map, enlargedBounds))
             {
                 var bounds = xforms.GetComponent(comp.Owner).InvWorldMatrix.TransformBox(worldBounds);
 
-                comp.LightTree.QueryAabb(ref state, (ref (Clyde clyde, Box2 worldAABB, int count, int shadowCastingCount) state, in PointLightComponent light) =>
+                comp.LightTree.QueryAabb(ref state, (ref (Clyde clyde, Box2 worldAABB, int count) state, in PointLightComponent light) =>
                 {
                     if (state.count >= LightsToRenderListSize)
                     {
@@ -543,9 +543,6 @@ namespace Robust.Client.Graphics.Clyde
                         return true;
                     }
 
-                    // If the light is a shadow casting light, keep a separate track of that
-                    if (light.CastShadows) state.shadowCastingCount++;
-
                     float distanceSquared = (state.worldAABB.Center - lightPos).LengthSquared;
                     state.clyde._lightsToRenderList[state.count++] = (light, lightPos, distanceSquared);
 
@@ -553,29 +550,17 @@ namespace Robust.Client.Graphics.Clyde
                 }, bounds);
             }
 
-            if (state.shadowCastingCount > _maxLightsPerScene)
+            if (state.count > _maxLightsPerScene)
             {
-                // There are too many lights casting shadows to fit in the scene.
+                // There are too many lights to fit in the scene.
                 // This check must occur before occluder expansion, or else bad things happen.
-
-                // First, partition the array based on whether the lights are shadow casting or not
-                // (non shadow casting lights should be the first partition, shadow casting lights the second)
+                // Sort lights by distance.
                 Array.Sort(_lightsToRenderList, 0, state.count, Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
-                {
-                    if (x.light.CastShadows && !y.light.CastShadows) return 1;
-                    else if (!x.light.CastShadows && y.light.CastShadows) return -1;
-                    else return 0;
-                }));
-
-                // Next, sort just the shadow casting lights by distance.
-                Array.Sort(_lightsToRenderList, state.count - state.shadowCastingCount, state.shadowCastingCount, Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
                 {
                     return x.distanceSquared.CompareTo(y.distanceSquared);
                 }));
-
-                // Then effectively delete the furthest lights, by setting the end of the array to exclude N
-                // number of shadow casting lights (where N is the number above the max number per scene.)
-                state.count -= state.shadowCastingCount - _maxLightsPerScene;
+                // Then effectively delete the furthest lights.
+                state.count = _maxLightsPerScene;
             }
 
             // When culling occluders later, we can't just remove any occluders outside the worldBounds.
@@ -861,6 +846,7 @@ namespace Robust.Client.Graphics.Clyde
             // 3D geometry used during depth projection.
             // 2D mask geometry used to apply wall bleed.
 
+            // TODO: This code probably does not work correctly with rotated camera.
             // TODO: Yes this function throws and index exception if you reach maxOccluders.
 
             const int maxOccluders = 2048;

Robust.Client/Graphics/Clyde/Clyde.Rendering.cs

@@ -994,9 +994,9 @@ namespace Robust.Client.Graphics.Clyde
 
         private sealed class SpriteDrawingOrderComparer : IComparer<int>
         {
-            private readonly RefList<(SpriteComponent, Vector2, Angle, Box2)> _drawList;
+            private readonly RefList<(SpriteComponent, Matrix3, Angle, float)> _drawList;
 
-            public SpriteDrawingOrderComparer(RefList<(SpriteComponent, Vector2, Angle, Box2)> drawList)
+            public SpriteDrawingOrderComparer(RefList<(SpriteComponent, Matrix3, Angle, float)> drawList)
             {
                 _drawList = drawList;
             }
@@ -1019,8 +1019,7 @@ namespace Robust.Client.Graphics.Clyde
                     return cmp;
                 }
 
-                // compare the top of the sprite's BB for y-sorting. Because screen coordinates are flipped, the "top" of the BB is actually the "bottom".
-                cmp = _drawList[x].Item4.Top.CompareTo(_drawList[y].Item4.Top);
+                cmp = _drawList[y].Item4.CompareTo(_drawList[x].Item4);
 
                 if (cmp != 0)
                 {

Robust.Client/Graphics/Clyde/Clyde.Windowing.cs

@@ -437,13 +437,6 @@ namespace Robust.Client.Graphics.Clyde
             _windowing!.WindowSetVisible(reg, visible);
         }
 
-        public void RunOnWindowThread(Action a)
-        {
-            DebugTools.AssertNotNull(_windowing);
-
-            _windowing!.RunOnWindowThread(a);
-        }
-
         private abstract class WindowReg
         {
             public bool IsDisposed;

Robust.Client/Graphics/Clyde/Clyde.cs

@@ -22,7 +22,7 @@ namespace Robust.Client.Graphics.Clyde
     /// <summary>
     ///     Responsible for most things rendering on OpenGL mode.
     /// </summary>
-    internal sealed partial class Clyde : IClydeInternal, IPostInjectInit, IEntityEventSubscriber
+    internal sealed partial class Clyde : IClydeInternal, IPostInjectInit
     {
         [Dependency] private readonly IClydeTileDefinitionManager _tileDefinitionManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
@@ -134,19 +134,16 @@ namespace Robust.Client.Graphics.Clyde
 
         public void PostInject()
         {
+            _mapManager.TileChanged += _updateTileMapOnUpdate;
+            _mapManager.OnGridCreated += _updateOnGridCreated;
+            _mapManager.OnGridRemoved += _updateOnGridRemoved;
+            _mapManager.GridChanged += _updateOnGridModified;
+
             // This cvar does not modify the actual GL version requested or anything,
             // it overrides the version we detect to detect GL features.
             RegisterBlockCVars();
         }
 
-        public void RegisterGridEcsEvents()
-        {
-            _entityManager.EventBus.SubscribeEvent<TileChangedEvent>(EventSource.Local, this, _updateTileMapOnUpdate);
-            _entityManager.EventBus.SubscribeEvent<GridStartupEvent>(EventSource.Local, this, _updateOnGridCreated);
-            _entityManager.EventBus.SubscribeEvent<GridRemovalEvent>(EventSource.Local, this, _updateOnGridRemoved);
-            _entityManager.EventBus.SubscribeEvent<GridModifiedEvent>(EventSource.Local, this, _updateOnGridModified);
-        }
-
         private void GLInitBindings(bool gles)
         {
             _glBindingsContext = _glContext!.BindingsContext;

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -76,11 +76,6 @@ namespace Robust.Client.Graphics.Clyde
             return null;
         }
 
-        public void RegisterGridEcsEvents()
-        {
-            // Nada.
-        }
-
         public void SetWindowTitle(string title)
         {
             // Nada.
@@ -251,11 +246,6 @@ namespace Robust.Client.Graphics.Clyde
             // Nada.
         }
 
-        public void RunOnWindowThread(Action action)
-        {
-            action();
-        }
-
         private sealed class DummyCursor : ICursor
         {
             public void Dispose()

Robust.Client/Graphics/Clyde/Windowing/Glfw.WindowThread.cs

@@ -118,10 +118,6 @@ namespace Robust.Client.Graphics.Clyde
                     case CmdWinCursorSet cmd:
                         WinThreadWinCursorSet(cmd);
                         break;
-
-                    case CmdRunAction cmd:
-                        cmd.Action();
-                        break;
                 }
             }
 
@@ -173,11 +169,6 @@ namespace Robust.Client.Graphics.Clyde
                 }
             }
 
-            public void RunOnWindowThread(Action action)
-            {
-                SendCmd(new CmdRunAction(action));
-            }
-
             private abstract record CmdBase;
 
             private sealed record CmdTerminate : CmdBase;
@@ -254,10 +245,6 @@ namespace Robust.Client.Graphics.Clyde
             private sealed record CmdCursorDestroy(
                 ClydeHandle Cursor
             ) : CmdBase;
-
-            private sealed record CmdRunAction(
-                Action Action
-            ) : CmdBase;
         }
     }
 }

Robust.Client/Graphics/Clyde/Windowing/IWindowingImpl.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Robust.Client.Input;
 using Robust.Shared.Maths;
 using SixLabors.ImageSharp;
@@ -59,9 +58,6 @@ namespace Robust.Client.Graphics.Clyde
             void GLMakeContextCurrent(WindowReg? reg);
             void GLSwapInterval(int interval);
             unsafe void* GLGetProcAddress(string procName);
-
-            // Misc
-            void RunOnWindowThread(Action a);
         }
     }
 }

Robust.Client/Graphics/FontManager.cs

@@ -9,7 +9,6 @@ using Robust.Shared.Utility;
 using SharpFont;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
-using TerraFX.Interop.Windows;
 
 namespace Robust.Client.Graphics
 {
@@ -59,14 +58,6 @@ namespace Robust.Client.Graphics
             return instance;
         }
 
-        public void ClearFontCache()
-        {
-            foreach (var fontInstance in _loadedInstances)
-            {
-                fontInstance.Value.ClearSizeData();
-            }
-        }
-
         private ScaledFontData _generateScaledDatum(FontInstanceHandle instance, float scale)
         {
             var ftFace = instance.FaceHandle.Face;
@@ -255,18 +246,6 @@ namespace Robust.Client.Graphics
                 FaceHandle = faceHandle;
             }
 
-            public void ClearSizeData()
-            {
-                foreach (var scaleData in _scaledData)
-                {
-                    foreach (var ownedTexture in scaleData.Value.AtlasTextures)
-                    {
-                        ownedTexture.Dispose();
-                    }
-                }
-                _scaledData.Clear();
-            }
-
             public Texture? GetCharTexture(Rune codePoint, float scale)
             {
                 var glyph = GetGlyph(codePoint);

Robust.Client/Graphics/IClydeInternal.cs

@@ -61,9 +61,5 @@ namespace Robust.Client.Graphics
 
         /// <returns>Null if not running on X11.</returns>
         uint? GetX11WindowId();
-
-        void RegisterGridEcsEvents();
-
-        void RunOnWindowThread(Action action);
     }
 }

Robust.Client/Graphics/IFontManager.cs

@@ -5,8 +5,9 @@ namespace Robust.Client.Graphics
 {
     public interface IFontManager
     {
-        public void ClearFontCache();
+
     }
+
     internal interface IFontManagerInternal : IFontManager
     {
         IFontFaceHandle Load(Stream stream);

Robust.Client/Map/ClydeTileDefinitionManager.cs

@@ -1,11 +1,11 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Client.Utility;
 using Robust.Shared.IoC;
-using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Utility;
@@ -22,20 +22,11 @@ namespace Robust.Client.Map
 
         public Texture TileTextureAtlas => _tileTextureAtlas ?? Texture.Transparent;
 
-        private readonly Dictionary<ushort, Box2[]> _tileRegions = new();
+        private readonly Dictionary<ushort, Box2> _tileRegions = new();
 
-        public Box2 ErrorTileRegion { get; private set; }
-
-        /// <inheritdoc />
-        public Box2[]? TileAtlasRegion(Tile tile)
+        public Box2? TileAtlasRegion(Tile tile)
         {
-            return TileAtlasRegion(tile.TypeId);
-        }
-
-        /// <inheritdoc />
-        public Box2[]? TileAtlasRegion(ushort tileType)
-        {
-            if (_tileRegions.TryGetValue(tileType, out var region))
+            if (_tileRegions.TryGetValue(tile.TypeId, out var region))
             {
                 return region;
             }
@@ -60,79 +51,39 @@ namespace Robust.Client.Map
 
             const int tileSize = EyeManager.PixelsPerMeter;
 
-            var tileCount = defList.Select(x => (int)x.Variants).Sum() + 1;
+            var dimensionX = (int) Math.Ceiling(Math.Sqrt(defList.Count));
+            var dimensionY = (int) Math.Ceiling((float) defList.Count / dimensionX);
 
-            var dimensionX = (int) Math.Ceiling(Math.Sqrt(tileCount));
-            var dimensionY = (int) Math.Ceiling((float) tileCount / dimensionX);
+            var sheet = new Image<Rgba32>(dimensionX * tileSize, dimensionY * tileSize);
 
-            var imgWidth = dimensionX * tileSize;
-            var imgHeight = dimensionY * tileSize;
-            var sheet = new Image<Rgba32>(imgWidth, imgHeight);
-
-            // Add in the missing tile texture sprite as tile texture 0.
+            for (var i = 0; i < defList.Count; i++)
             {
-                var w = (float) sheet.Width;
-                var h = (float) sheet.Height;
-                ErrorTileRegion = Box2.FromDimensions(
-                    0, (h - EyeManager.PixelsPerMeter) / h,
-                    tileSize / w, tileSize / h);
-                Image<Rgba32> image;
-                using (var stream = _resourceCache.ContentFileRead("/Textures/noTile.png"))
-                {
-                    image = Image.Load<Rgba32>(stream);
-                }
+                var def = defList[i];
+                var column = i % dimensionX;
+                var row = i / dimensionX;
 
-                image.Blit(new UIBox2i(0, 0, tileSize, tileSize), sheet, Vector2i.Zero);
-            }
-
-            if (imgWidth >= 2048 || imgHeight >= 2048)
-            {
-                // Sanity warning, some machines don't have textures larger than this and need multiple atlases.
-                Logger.WarningS("clyde",
-                    $"Tile texture atlas is ({imgWidth} x {imgHeight}), larger than 2048 x 2048. If you really need {tileCount} tiles, file an issue on RobustToolbox.");
-            }
-
-            var column = 1;
-            var row = 0;
-            foreach (var def in defList)
-            {
                 Image<Rgba32> image;
                 using (var stream = _resourceCache.ContentFileRead(new ResourcePath(def.Path) / $"{def.SpriteName}.png"))
                 {
                     image = Image.Load<Rgba32>(stream);
                 }
 
-                if (image.Width != (tileSize * def.Variants) || image.Height != tileSize)
+                if (image.Width != tileSize || image.Height != tileSize)
                 {
-                    throw new NotSupportedException(
-                        $"Unable to load {new ResourcePath(def.Path) / $"{def.SpriteName}.png"}, due to being unable to use tile texture with a dimension other than {tileSize}x({tileSize} * Variants).");
+                    throw new NotSupportedException("Unable to use tiles with a dimension other than 32x32.");
                 }
 
-                var regionList = new Box2[def.Variants];
+                var point = new Vector2i(column * tileSize, row * tileSize);
 
-                for (var j = 0; j < def.Variants; j++)
-                {
-                    var point = new Vector2i(column * tileSize, row * tileSize);
+                image.Blit(new UIBox2i(0, 0, image.Width, image.Height), sheet, point);
 
-                    var box = new UIBox2i(0, 0, tileSize, tileSize).Translated(new Vector2i(j * tileSize, 0));
-                    image.Blit(box, sheet, point);
+                var w = (float) sheet.Width;
+                var h = (float) sheet.Height;
 
-                    var w = (float) sheet.Width;
-                    var h = (float) sheet.Height;
-
-                    regionList[j] = Box2.FromDimensions(
+                _tileRegions.Add(def.TileId,
+                    Box2.FromDimensions(
                         point.X / w, (h - point.Y - EyeManager.PixelsPerMeter) / h,
-                        tileSize / w, tileSize / h);
-                    column++;
-
-                    if (column >= dimensionX)
-                    {
-                        column = 0;
-                        row++;
-                    }
-                }
-
-                _tileRegions.Add(def.TileId, regionList);
+                        tileSize / w, tileSize / h));
             }
 
             _tileTextureAtlas = Texture.LoadFromImage(sheet, "Tile Atlas");

Robust.Client/Map/IClydeTileDefinitionManager.cs

@@ -1,4 +1,3 @@
-using System.Collections.Generic;
 using Robust.Client.Graphics;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
@@ -10,8 +9,6 @@ namespace Robust.Client.Map
     /// </summary>
     internal interface IClydeTileDefinitionManager : ITileDefinitionManager
     {
-        Box2 ErrorTileRegion { get; }
-
         /// <summary>
         ///     The texture atlas containing all the tiles.
         /// </summary>
@@ -21,12 +18,6 @@ namespace Robust.Client.Map
         ///     Gets the region inside the texture atlas to use to draw a tile.
         /// </summary>
         /// <returns>If null, do not draw the tile at all.</returns>
-        Box2[]? TileAtlasRegion(Tile tile);
-
-        /// <summary>
-        ///     Gets the region inside the texture atlas to use to draw a tile type.
-        /// </summary>
-        /// <returns>If null, do not draw the tile at all.</returns>
-        Box2[]? TileAtlasRegion(ushort tileType);
+        Box2? TileAtlasRegion(Tile tile);
     }
 }

Robust.Client/Physics/PhysicsSystem.cs

@@ -37,7 +37,7 @@ namespace Robust.Client.Physics
             SimulateWorld((float) diff.TotalSeconds, true);
         }
 
-        protected override void HandleMapCreated(MapChangedEvent eventArgs)
+        protected override void HandleMapCreated(object? sender, MapEventArgs eventArgs)
         {
             if (eventArgs.Map == MapId.Nullspace) return;
             var mapUid = MapManager.GetMapEntityId(eventArgs.Map);

Robust.Client/Placement/Modes/AlignSimilar.cs

@@ -31,7 +31,7 @@ namespace Robust.Client.Placement.Modes
 
             var mapId = MouseCoords.GetMapId(pManager.EntityManager);
 
-            var snapToEntities = EntitySystem.Get<EntityLookupSystem>().GetEntitiesInRange(MouseCoords, SnapToRange)
+            var snapToEntities = IoCManager.Resolve<IEntityLookup>().GetEntitiesInRange(MouseCoords, SnapToRange)
                 .Where(entity => pManager.EntityManager.GetComponent<MetaDataComponent>(entity).EntityPrototype == pManager.CurrentPrototype && pManager.EntityManager.GetComponent<TransformComponent>(entity).MapID == mapId)
                 .OrderBy(entity => (pManager.EntityManager.GetComponent<TransformComponent>(entity).WorldPosition - MouseCoords.ToMapPos(pManager.EntityManager)).LengthSquared)
                 .ToList();

Robust.Client/Placement/Modes/AlignTileEmpty.cs

@@ -53,7 +53,7 @@ namespace Robust.Client.Placement.Modes
             var topRight = new Vector2(CurrentTile.X + 0.99f, CurrentTile.Y + 0.99f);
             var box = new Box2(bottomLeft, topRight);
 
-            return !EntitySystem.Get<EntityLookupSystem>().AnyEntitiesIntersecting(map, box);
+            return !IoCManager.Resolve<IEntityLookup>().AnyEntitiesIntersecting(map, box);
         }
     }
 }

Robust.Client/Placement/PlacementManager.cs

@@ -22,7 +22,7 @@ using Robust.Shared.Utility;
 
 namespace Robust.Client.Placement
 {
-    public sealed partial class PlacementManager : IPlacementManager, IDisposable, IEntityEventSubscriber
+    public sealed partial class PlacementManager : IPlacementManager, IDisposable
     {
         [Dependency] private readonly IClientNetManager NetworkManager = default!;
         [Dependency] public readonly IPlayerManager PlayerManager = default!;
@@ -185,7 +185,7 @@ namespace Robust.Client.Placement
                 _modeDictionary.Add(type.Name, type);
             }
 
-            EntityManager.EventBus.SubscribeEvent<TileChangedEvent>(EventSource.Local, this, HandleTileChanged);
+            MapManager.TileChanged += HandleTileChanged;
 
             _drawOverlay = new PlacementOverlay(this);
             _overlayManager.AddOverlay(_drawOverlay);
@@ -328,7 +328,7 @@ namespace Robust.Client.Placement
             }
         }
 
-        private void HandleTileChanged(TileChangedEvent args)
+        private void HandleTileChanged(object? sender, TileChangedEventArgs args)
         {
             var coords = MapManager.GetGrid(args.NewTile.GridIndex).GridTileToLocal(args.NewTile.GridIndices);
             _pendingTileChanges.RemoveAll(c => c.Item1 == coords);

Robust.Client/ResourceManagement/ResourceTypes/RSIResource.cs

@@ -230,7 +230,7 @@ namespace Robust.Client.ResourceManagement
 
             using (var manifestFile = cache.ContentFileRead(manifestPath))
             {
-                if (manifestFile.CanSeek && manifestFile.Length <= 4096)
+                if (manifestFile.Length <= 4096)
                 {
                     // Most RSIs are actually tiny so if that's the case just load them into a stackalloc buffer.
                     // Avoids a ton of allocations with stream reader etc

Robust.Client/Robust.Client.csproj

@@ -13,8 +13,8 @@
   <Import Project="..\MSBuild\Robust.DefineConstants.targets" />
   <ItemGroup>
     <PackageReference Include="DiscordRichPresence" Version="1.0.175" />
-    <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.Data.Sqlite" Version="6.0.2" />
+    <PackageReference Include="JetBrains.Annotations" Version="2020.3.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="5.0.3" />
     <PackageReference Include="nfluidsynth" Version="0.3.1" />
     <PackageReference Include="NVorbis" Version="0.10.1" />
     <PackageReference Include="SixLabors.ImageSharp" Version="1.0.4" />
@@ -25,9 +25,9 @@
     <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.20348-rc2" />
   </ItemGroup>
   <ItemGroup Condition="'$(EnableClientScripting)' == 'True'">
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="3.8.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="3.8.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.8.0" />
 
     <ProjectReference Include="..\Robust.Shared.Scripting\Robust.Shared.Scripting.csproj" />
   </ItemGroup>
@@ -53,7 +53,6 @@
     <Compile Update="UserInterface\CustomControls\DefaultWindow.xaml.cs">
       <DependentUpon>DefaultWindow.xaml</DependentUpon>
     </Compile>
-    <Compile Remove="Debugging\IDebugDrawing.cs" />
   </ItemGroup>
   <Import Project="..\MSBuild\Robust.Engine.targets" />
   <PropertyGroup>

Robust.Client/UserInterface/Controls/WindowRoot.cs

@@ -1,6 +1,4 @@
 using Robust.Client.Graphics;
-using Robust.Shared.Maths;
-using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.UserInterface.Controls
 {
@@ -11,30 +9,6 @@ namespace Robust.Client.UserInterface.Controls
             Window = window;
         }
 
-        /// <summary>
-        ///     Enable the UI autoscale system, this will scale down the UI for lower resolutions
-        /// </summary>
-        [ViewVariables]
-        public bool AutoScale { get; set; } = false;
-
-        /// <summary>
-        ///     Minimum resolution to start clamping autoscale to 1
-        /// </summary>
-        [ViewVariables]
-        public Vector2i AutoScaleUpperCutoff { get; set; } = new Vector2i(1080, 720);
-
-        /// <summary>
-        ///     Maximum resolution to start clamping autos scale to autoscale minimum
-        /// </summary>
-        [ViewVariables]
-        public Vector2i AutoScaleLowerCutoff { get; set; } = new Vector2i(520, 520);
-
-        /// <summary>
-        ///     The minimum ui scale value that autoscale will scale to
-        /// </summary>
-        [ViewVariables]
-        public float AutoScaleMinimum { get; set; } = 0.5f;
-
         public override float UIScale => UIScaleSet;
         internal float UIScaleSet { get; set; }
         public override IClydeWindow Window { get; }

Robust.Client/UserInterface/FileDialogManager.cs

@@ -8,7 +8,6 @@ using System.Text;
 using System.Threading.Tasks;
 using Robust.Client.Graphics;
 using Robust.Shared;
-using Robust.Shared.Console;
 using Robust.Shared.Asynchronous;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
@@ -165,11 +164,12 @@ namespace Robust.Client.UserInterface
         {
             if (OperatingSystem.IsMacOS())
             {
-                // macOS seems pretty annoying about having the file dialog opened from the main windowing thread.
-                // So we are forced to execute this synchronously on the main windowing thread.
-                // nativefiledialog doesn't provide any form of async API, so this WILL lock up half the client.
+                // macOS seems pretty annoying about having the file dialog opened from the main thread.
+                // So we are forced to execute this synchronously on the main thread.
+                // Also I'm calling RunOnMainThread here to provide safety in case this is ran from a different thread.
+                // nativefiledialog doesn't provide any form of async API, so this WILL lock up the client.
                 var tcs = new TaskCompletionSource<string?>();
-                _clyde.RunOnWindowThread(() => tcs.SetResult(action()));
+                _taskManager.RunOnMainThread(() => tcs.SetResult(action()));
 
                 return tcs.Task;
             }
@@ -388,17 +388,4 @@ namespace Robust.Client.UserInterface
             SW_NFD_CANCEL,
         }
     }
-
-    public sealed class OpenFileCommand : IConsoleCommand
-    {
-        public string Command => "testopenfile";
-        public string Description => "";
-        public string Help => "";
-
-        public async void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            var stream = await IoCManager.Resolve<IFileDialogManager>().OpenFile();
-            stream?.Dispose();
-        }
-    }
 }

Robust.Client/UserInterface/UserInterfaceManager.cs

@@ -1,6 +1,5 @@
-using System;
+using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using Robust.Client.Graphics;
 using Robust.Client.Input;
@@ -13,7 +12,6 @@ using Robust.Shared.Configuration;
 using Robust.Shared.Input;
 using Robust.Shared.Input.Binding;
 using Robust.Shared.IoC;
-using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Network;
@@ -25,7 +23,6 @@ namespace Robust.Client.UserInterface
     internal sealed class UserInterfaceManager : IUserInterfaceManagerInternal
     {
         [Dependency] private readonly IInputManager _inputManager = default!;
-        [Dependency] private readonly IFontManager _fontManager = default!;
         [Dependency] private readonly IClydeInternal _clyde = default!;
         [Dependency] private readonly IGameTiming _gameTiming = default!;
         [Dependency] private readonly IPlayerManager _playerManager = default!;
@@ -954,37 +951,14 @@ namespace Robust.Client.UserInterface
         private void WindowContentScaleChanged(WindowContentScaleEventArgs args)
         {
             if (_windowsToRoot.TryGetValue(args.Window.Id, out var root))
-            {
                 UpdateUIScale(root);
-                _fontManager.ClearFontCache();
-            }
-
-        }
-
-        private float CalculateAutoScale(WindowRoot root)
-        {
-            //Grab the OS UIScale or the value set through CVAR debug
-            var osScale = _configurationManager.GetCVar(CVars.DisplayUIScale);
-            osScale = osScale == 0f ? root.Window.ContentScale.X : osScale;
-            var windowSize = root.Window.RenderTarget.Size;
-            //Only run autoscale if it is enabled, otherwise default to just use OS UIScale
-            if (!root.AutoScale && (windowSize.X <= 0 || windowSize.Y <= 0)) return osScale;
-            var maxScaleRes = root.AutoScaleUpperCutoff;
-            var minScaleRes = root.AutoScaleLowerCutoff;
-            var autoScaleMin = root.AutoScaleMinimum;
-            float scaleRatioX;
-            float scaleRatioY;
-
-            //Calculate the scale ratios and clamp it between the maximums and minimums
-            scaleRatioX = Math.Clamp(((float) windowSize.X - minScaleRes.X) / (maxScaleRes.X - minScaleRes.X) * osScale, autoScaleMin, osScale);
-            scaleRatioY = Math.Clamp(((float) windowSize.Y - minScaleRes.Y) / (maxScaleRes.Y - minScaleRes.Y) * osScale, autoScaleMin, osScale);
-            //Take the smallest UIScale value and use it for UI scaling
-            return Math.Min(scaleRatioX, scaleRatioY);
         }
 
         private void UpdateUIScale(WindowRoot root)
         {
-            root.UIScaleSet = CalculateAutoScale(root);
+            var newVal = _configurationManager.GetCVar(CVars.DisplayUIScale);
+            root.UIScaleSet = newVal == 0f ? root.Window.ContentScale.X : newVal;
+
             _propagateUIScaleChanged(root);
             root.InvalidateMeasure();
         }
@@ -1003,7 +977,7 @@ namespace Robust.Client.UserInterface
         {
             if (!_windowsToRoot.TryGetValue(windowResizedEventArgs.Window.Id, out var root))
                 return;
-            UpdateUIScale(root);
+
             root.InvalidateMeasure();
         }
 

Robust.Client/Utility/SpriteSpecifierExt.cs

@@ -22,7 +22,6 @@ namespace Robust.Client.Utility
                 .Texture;
         }
 
-        [Obsolete("Use SpriteSystem")]
         public static RSI.State GetState(this SpriteSpecifier.Rsi rsiSpecifier, IResourceCache cache)
         {
             if (cache.TryGetResource<RSIResource>(
@@ -37,7 +36,6 @@ namespace Robust.Client.Utility
             return SpriteComponent.GetFallbackState(cache);
         }
 
-        [Obsolete("Use SpriteSystem")]
         public static Texture Frame0(this SpriteSpecifier specifier)
         {
             return specifier.RsiStateLike().Default;
@@ -82,7 +80,6 @@ namespace Robust.Client.Utility
             return specifier.RsiStateLike();
         }
 
-        [Obsolete("Use SpriteSystem")]
         public static IRsiStateLike RsiStateLike(this SpriteSpecifier specifier)
         {
             var resC = IoCManager.Resolve<IResourceCache>();

Robust.Docfx/articles/example-article.md

@@ -1 +0,0 @@
-# Add your introductions here!

Robust.Docfx/articles/toc.yml

@@ -1,2 +0,0 @@
-- name: Example-article
-  href: example-article.md

Robust.Docfx/docfx.json

@@ -1,214 +0,0 @@
-{
-  "metadata": [
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.UnitTesting"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.UnitTesting"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Shared"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Shared"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Shared.Maths"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Shared.Maths"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Shared.Scripting"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Shared.Scripting"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Client"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Client"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Client.WebView"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Client.WebView"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.Server"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.Server"
-    },
-    {
-      "src":
-      [
-        {
-          "files": [
-            "**.csproj"
-          ],
-          "exclude": [
-            "**/bin/**",
-            "**/obj/**",
-            "_site/**",
-            "**.xaml"
-          ],
-          "src": "../Robust.LoaderApi"
-        }
-      ],
-      "disableGitFeatures": false,
-      "disableDefaultFilter": false,
-      "dest": "api/Robust.LoaderApi/Robust.LoaderApi"
-    }
-  ],
-  "build": {
-    "content": [
-      {
-        "files": [
-          "api/**/**.yml"
-        ]
-      },
-      {
-        "files": [
-          "articles/**.md",
-          "articles/**/toc.yml",
-          "toc.yml",
-          "*.md"
-        ]
-      }
-    ],
-    "resource": [
-      {
-        "files": [
-          "images/**",
-          "favicon.ico",
-          "icon.svg"          
-        ]
-      }
-    ],
-    "overwrite": [
-      {
-        "files": [
-          "apidoc/**.md"
-        ],
-        "exclude": [
-          "obj/**",
-          "_site/**"
-        ]
-      }
-    ],
-    "dest": "_robust-site",
-    "globalMetadataFiles": [],
-    "fileMetadataFiles": [],
-    "template": [
-      "default",
-      "templates/darkfx"
-    ],
-    "postProcessors": [],
-    "markdownEngineName": "markdig",
-    "noLangKeyword": false,
-    "keepFileLink": false,
-    "cleanupCacheHistory": false,
-    "disableGitFeatures": false
-  }
-}

Robust.Docfx/index.md

@@ -1,6 +0,0 @@
-# RobustToolbox DocFX
-![](https://i.imgur.com/Sv3Swxg.png)
-
-## Welcome to the RobustToolbox DocFX instance.
-### Click one of the tabs above to see documentation for that particular project/namespace
-

Robust.Docfx/templates/darkfx/LICENSE.txt

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2021 Steffen Wilke
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

Robust.Docfx/templates/darkfx/partials/affix.tmpl.partial

@@ -1,40 +0,0 @@
-{{!Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.}}
-
-<div class="hidden-sm col-md-2" role="complementary">
-  <div class="sideaffix">
-    {{^_disableContribution}}
-    <div class="contribution">
-      <ul class="nav">
-        {{#docurl}}
-        <li>
-          <a href="{{docurl}}" class="contribution-link">{{__global.improveThisDoc}}</a>
-        </li>
-        {{/docurl}}
-        {{#sourceurl}}
-        <li>
-          <a href="{{sourceurl}}" class="contribution-link">{{__global.viewSource}}</a>
-        </li>
-        {{/sourceurl}}
-      </ul>
-    </div>
-    {{/_disableContribution}}
-    <div class="toggle-mode">
-      <div class="icon">
-        <i aria-hidden="true">☀</i>
-      </div>
-      <label class="switch">
-        <input type="checkbox" id="switch-style">
-        <span class="slider round"></span>
-      </label>
-      <div class="icon">
-        <i aria-hidden="true">☾</i>
-      </div>
-    </div>
-
-    <nav class="bs-docs-sidebar hidden-print hidden-xs hidden-sm affix" id="affix">
-    <h5>{{__global.inThisArticle}}</h5>
-    <div></div>
-    <!-- <p><a class="back-to-top" href="#top">Back to top</a><p> -->
-    </nav>
-  </div>
-</div>

Robust.Docfx/templates/darkfx/partials/footer.tmpl.partial

@@ -1,29 +0,0 @@
-{{!Copyright (c) Microsoft. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.}}
-
-<footer>
-  <div class="grad-bottom"></div>
-  <div class="footer">
-    <div class="container">
-      <span class="pull-right">
-        <a href="#top">Back to top</a>
-      </span>
-      <div class="pull-left">
-        {{{_appFooter}}}
-        {{^_appFooter}}<span>Generated by <strong>DocFX</strong></span>{{/_appFooter}}
-      </div>
-      <div class="toggle-mode pull-right visible-sm visible-xs">
-        <div class="icon">
-          <i aria-hidden="true">☀</i>
-        </div>
-        <label class="switch">
-          <input type="checkbox" id="switch-style-m">
-          <span class="slider round"></span>
-        </label>
-        <div class="icon">
-          <i aria-hidden="true">☾</i>
-        </div>
-      </div>
-    </div>
-  </div>
-  <script type="text/javascript" src="{{_rel}}styles/toggle-theme.js"></script>
-</footer>

Robust.Docfx/templates/darkfx/partials/head.tmpl.partial

@@ -1,20 +0,0 @@
-{{!Copyright (c) Oscar Vasquez. All rights reserved. Licensed under the MIT license. See LICENSE file in the project root for full license information.}}
-
-<head>
-  <meta charset="utf-8">
-  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
-  <title>{{#title}}{{title}}{{/title}}{{^title}}{{>partials/title}}{{/title}} {{#_appTitle}}| {{_appTitle}} {{/_appTitle}}</title>
-  <meta name="viewport" content="width=device-width">
-  <meta name="title" content="{{#title}}{{title}}{{/title}}{{^title}}{{>partials/title}}{{/title}} {{#_appTitle}}| {{_appTitle}} {{/_appTitle}}">
-  <meta name="generator" content="docfx {{_docfxVersion}}">
-  {{#_description}}<meta name="description" content="{{_description}}">{{/_description}}
-  <link rel="shortcut icon" href="{{_rel}}{{{_appFaviconPath}}}{{^_appFaviconPath}}favicon.ico{{/_appFaviconPath}}">
-  <link rel="stylesheet" href="{{_rel}}styles/docfx.vendor.css">
-  <link rel="stylesheet" href="{{_rel}}styles/docfx.css">
-  <link rel="stylesheet" href="{{_rel}}styles/main.css">
-  <meta property="docfx:navrel" content="{{_navRel}}">
-  <meta property="docfx:tocrel" content="{{_tocRel}}">
-  {{#_noindex}}<meta name="searchOption" content="noindex">{{/_noindex}}
-  {{#_enableSearch}}<meta property="docfx:rel" content="{{_rel}}">{{/_enableSearch}}
-  {{#_enableNewTab}}<meta property="docfx:newtab" content="true">{{/_enableNewTab}}
-</head>

Robust.Docfx/templates/darkfx/styles/main.css

@@ -1,470 +0,0 @@
-:root, body.dark-theme {
-  --color-foreground: #ccd5dc;
-  --color-navbar: #66666d;
-  --color-breadcrumb: #999;
-  --color-underline: #ddd;
-  --color-toc-hover: #fff;
-  --color-background: #2d2d30;
-  --color-background-subnav: #333337;
-  --color-background-dark: #1e1e1e;
-  --color-background-table-alt: #212123;
-  --color-background-quote: #69696e;
-}
-
-body.light-theme {
-  --color-foreground: #171717;
-  --color-breadcrumb: #4a4a4a;
-  --color-toc-hover: #4c4c4c;
-  --color-background: #ffffff;
-  --color-background-subnav: #f5f5f5;
-  --color-background-dark: #ddd;
-  --color-background-table-alt: #f9f9f9;
-}
-
-body {
-  color: var(--color-foreground);
-  line-height: 1.5;
-  font-size: 14px;
-  -ms-text-size-adjust: 100%;
-  -webkit-text-size-adjust: 100%;
-  word-wrap: break-word;
-  background-color: var(--color-background);
-}
-
-.btn.focus, .btn:focus, .btn:hover {
-  color: var(--color-foreground);
-}
-
-h1 {
-  font-weight: 600;
-  font-size: 32px;
-}
-
-h2 {
-  font-weight: 600;
-  font-size: 24px;
-  line-height: 1.8;
-}
-
-h3 {
-  font-weight: 600;
-  font-size: 20px;
-  line-height: 1.8;
-}
-
-h5 {
-  font-size: 14px;
-  padding: 10px 0px;
-}
-
-article h1, article h2, article h3, article h4 {
-  margin-top: 35px;
-  margin-bottom: 15px;
-}
-
-article h4 {
-  padding-bottom: 8px;
-  border-bottom: 2px solid var(--color-underline);
-}
-
-.navbar-brand>img {
-  color: var(--color-background);
-}
-
-.navbar {
-  border: none;
-}
-
-.subnav {
-  border-top: 1px solid var(--color-underline);
-  background-color: var(--color-background-subnav);
-}
-
-.sidenav, .fixed_header, .toc {
-  background-color: var(--color-background);
-}
-
-.navbar-inverse {
-  background-color: var(--color-background-dark);
-  z-index: 100;
-}
-
-.navbar-inverse .navbar-nav>li>a, .navbar-inverse .navbar-text {
-  color: var(--color-navbar);
-  background-color: var(--color-background-dark);
-  border-bottom: 3px solid transparent;
-  padding-bottom: 12px;
-}
-
-.navbar-inverse .navbar-nav>li>a:focus, .navbar-inverse .navbar-nav>li>a:hover {
-  color: var(--color-foreground);
-  background-color: var(--color-background-dark);
-  border-bottom: 3px solid var(--color-background-subnav);
-  transition: all ease 0.25s;
-}
-
-.navbar-inverse .navbar-nav>.active>a, .navbar-inverse .navbar-nav>.active>a:focus, .navbar-inverse .navbar-nav>.active>a:hover {
-  color: var(--color-foreground);
-  background-color: var(--color-background-dark);
-  border-bottom: 3px solid var(--color-foreground);
-  transition: all ease 0.25s;
-}
-
-.navbar-form .form-control {
-  border: none;
-  border-radius: 0;
-}
-
-.light-theme .navbar-brand svg {
-  filter: brightness(20%);
-}
-
-.toc .level1>li {
-  font-weight: 400;
-}
-
-.toc .nav>li>a {
-  color: var(--color-foreground);
-}
-
-.sidefilter {
-  background-color: var(--color-background);
-  border-left: none;
-  border-right: none;
-}
-
-.sidefilter {
-  background-color: var(--color-background);
-  border-left: none;
-  border-right: none;
-}
-
-.toc-filter {
-  padding: 10px;
-  margin: 0;
-  background-color: var(--color-background);
-}
-
-.toc-filter>input {
-  border: none;
-  border-radius: unset;
-  background-color: var(--color-background-subnav);
-  padding: 5px 0 5px 20px;
-  font-size: 90%
-}
-
-.toc-filter>.clear-icon {
-  position: absolute;
-  top: 17px;
-  right: 15px;
-}
-
-.toc-filter>input:focus {
-  color: var(--color-foreground);
-  transition: all ease 0.25s;
-}
-
-.toc-filter>.filter-icon {
-  display: none;
-}
-
-.sidetoc>.toc {
-  background-color: var(--color-background);
-  overflow-x: hidden;
-}
-
-.sidetoc {
-  background-color: var(--color-background);
-  border: none;
-}
-
-.alert {
-  background-color: inherit;
-  border: none;
-  padding: 10px 0;
-  border-radius: 0;
-}
-
-.alert>p {
-  margin-bottom: 0;
-  padding: 5px 10px;
-  border-bottom: 1px solid;
-  background-color: var(--color-background-dark);
-}
-
-.alert>h5 {
-  padding: 10px 15px;
-  margin-top: 0;
-  margin-bottom: 0;
-  text-transform: uppercase;
-  font-weight: bold;
-  border-top: 2px solid;
-  background-color: var(--color-background-dark);
-  border-radius: none;
-}
-
-.alert>ul {
-  margin-bottom: 0;
-  padding: 5px 40px;
-}
-
-.alert-info {
-  color: #1976d2;
-}
-
-.alert-warning {
-  color: #f57f17;
-}
-
-.alert-danger {
-  color: #d32f2f;
-}
-
-pre {
-  padding: 9.5px;
-  margin: 0 0 10px;
-  font-size: 13px;
-  word-break: break-all;
-  word-wrap: break-word;
-  background-color: var(--color-background-dark);
-  border-radius: 0;
-  border: none;
-}
-
-code {
-  background: var(--color-background-dark) !important;
-  border-radius: 2px;
-}
-
-.hljs {
-  color: var(--color-foreground);
-}
-
-.toc .nav>li.active>.expand-stub::before, .toc .nav>li.in>.expand-stub::before, .toc .nav>li.in.active>.expand-stub::before, .toc .nav>li.filtered>.expand-stub::before {
-  content: "▾";
-}
-
-.toc .nav>li>.expand-stub::before, .toc .nav>li.active>.expand-stub::before {
-  content: "▸";
-}
-
-.affix ul ul>li>a:before {
-  content: "|";
-}
-
-.breadcrumb {
-  background-color: var(--color-background-subnav);
-}
-
-.breadcrumb .label.label-primary {
-  background: #444;
-  border-radius: 0;
-  font-weight: normal;
-  font-size: 100%;
-}
-
-#breadcrumb .breadcrumb>li a {
-  border-radius: 0;
-  font-weight: normal;
-  font-size: 85%;
-  display: inline;
-  padding: 0 .6em 0;
-  line-height: 1;
-  text-align: center;
-  white-space: nowrap;
-  vertical-align: baseline;
-  color: var(--color-breadcrumb);
-}
-
-#breadcrumb .breadcrumb>li a:hover {
-  color: var(--color-foreground);
-  transition: all ease 0.25s;
-}
-
-.breadcrumb>li+li:before {
-  content: "⯈";
-  font-size: 75%;
-  color: var(--color-background-dark);
-  padding: 0;
-}
-
-.light-theme .breadcrumb>li+li:before {
-  color: var(--color-foreground)
- }
-
-.toc .level1>li {
-  font-weight: 600;
-  font-size: 130%;
-  padding-left: 5px;
-}
-
-.footer {
-  border-top: none;
-  background-color: var(--color-background-dark);
-  padding: 15px 0;
-  font-size: 90%;
-}
-
-.toc .nav>li>a:hover, .toc .nav>li>a:focus {
-  color: var(--color-toc-hover);
-  transition: all ease 0.1s;
-}
-
-.form-control {
-  background-color: var(--color-background-subnav);
-  border: none;
-  border-radius: 0;
-  -webkit-box-shadow: none;
-  box-shadow: none;
-}
-
-.form-control:focus {
-  border-color: #66afe9;
-  outline: 0;
-  -webkit-box-shadow: none;
-  box-shadow: none;
-}
-
-input#search-query:focus {
-  color: var(--color-foreground);
-}
-
-.table-bordered, .table-bordered>tbody>tr>td, .table-bordered>tbody>tr>th, .table-bordered>tfoot>tr>td, .table-bordered>tfoot>tr>th, .table-bordered>thead>tr>td, .table-bordered>thead>tr>th {
-  border: 1px solid var(--color-background-dark);
-}
-
-.table-striped>tbody>tr:nth-of-type(odd) {
-  background-color: var(--color-background-table-alt);
-}
-
-blockquote {
-  padding: 10px 20px;
-  margin: 0 0 10px;
-  font-size: 110%;
-  border-left: 5px solid var(--color-background-quote);
-  color: var(--color-background-quote);
-}
-
-.pagination>.disabled>a, .pagination>.disabled>a:focus, .pagination>.disabled>a:hover, .pagination>.disabled>span, .pagination>.disabled>span:focus, .pagination>.disabled>span:hover {
-  background-color: var(--color-background-subnav);
-  border-color: var(--color-background-subnav);
-}
-
-.breadcrumb>li, .pagination {
-  display: inline;
-}
-
-.tabGroup a[role="tab"] {
-  border-bottom: 2px solid var(--color-background-dark);
-}
-
-.tabGroup a[role="tab"][aria-selected="true"] {
-  color: var(--color-foreground);
-}
-
-.tabGroup section[role="tabpanel"] {
-  border: 1px solid var(--color-background-dark);
-}
-
-.sideaffix > div.contribution > ul > li > a.contribution-link:hover {
-  background-color: var(--color-background);
-}
-
-.switch {
-  position: relative;
-  display: inline-block;
-  width: 40px;
-  height: 20px;
-}
-
-.switch input { 
-  opacity: 0;
-  width: 0;
-  height: 0;
-}
-
-.slider {
-  position: absolute;
-  cursor: pointer;
-  top: 0;
-  left: 0;
-  right: 0;
-  bottom: 0;
-  background-color: #ccc;
-  -webkit-transition: .4s;
-  transition: .4s;
-}
-
-.slider:before {
-  position: absolute;
-  content: "";
-  height: 14px;
-  width: 14px;
-  left: 4px;
-  bottom: 3px;
-  background-color: white;
-  -webkit-transition: .4s;
-  transition: .4s;
-}
-
-input:checked + .slider {
-  background-color: #337ab7;
-}
-
-input:focus + .slider {
-  box-shadow: 0 0 1px #337ab7;
-}
-
-input:checked + .slider:before {
-  -webkit-transform: translateX(19px);
-  -ms-transform: translateX(19px);
-  transform: translateX(19px);
-}
-
-/* Rounded sliders */
-.slider.round {
-  border-radius: 20px;
-}
-
-.slider.round:before {
-  border-radius: 50%;
-}
-.toggle-mode .icon {
-  display: inline-block;
-}
-
-.toggle-mode .icon i {
-  font-style: normal;
-  font-size: 17px;
-  display: inline-block;
-  padding-right: 7px;
-  padding-left: 7px;
-  vertical-align: middle;
-}
-
-@media (min-width: 1600px) {
-  .container {
-    width: 100%;
-  }
-  .sidefilter {
-    width: 18%;
-  }
-  .sidetoc {
-    width: 18%;
-  }
-  .article.grid-right {
-    margin-left: 19%;
-  }
-  .sideaffix {
-    width: 11.5%;
-  }
-  .affix ul>li.active>a {
-    white-space: initial;
-  }
-  .affix ul>li>a {
-    width: 99%;
-    overflow: hidden;
-    white-space: nowrap;
-    text-overflow: ellipsis;
-  }
-}

Robust.Docfx/templates/darkfx/styles/toggle-theme.js

@@ -1,35 +0,0 @@
-const sw = document.getElementById("switch-style"), sw_mobile = document.getElementById("switch-style-m"), b = document.body;
-if (b) {
-  function toggleTheme(target, dark) {
-    target.classList.toggle("dark-theme", dark)
-    target.classList.toggle("light-theme", !dark)
-  }
-
-  function switchEventListener() {
-    toggleTheme(b, this.checked);
-    if (window.localStorage) {
-      this.checked ? localStorage.setItem("theme", "dark-theme") : localStorage.setItem("theme", "light-theme")
-    }
-  }
-
-  var isDarkTheme = !window.localStorage || !window.localStorage.getItem("theme") || window.localStorage && localStorage.getItem("theme") === "dark-theme";
-
-  if(sw && sw_mobile){
-    sw.checked = isDarkTheme;
-    sw_mobile.checked = isDarkTheme;
-
-    sw.addEventListener("change", switchEventListener);
-    sw_mobile.addEventListener("change", switchEventListener);
-    
-    // sync state between switches
-    sw.addEventListener("change", function() {
-      sw_mobile.checked = this.checked;
-    });
-
-    sw_mobile.addEventListener("change", function() {
-      sw.checked = this.checked;
-    });
-  }
-
-  toggleTheme(b, isDarkTheme);
-}

Robust.Docfx/toc.yml

@@ -1,29 +0,0 @@
-- name: Articles
-  href: articles/
-  
-# Client 
-- name: Robust.Client 
-  href: api/Robust.Client/
-  homepage: api/Robust.Client/Robust.Client.html
-- name: Robust.Client.WebView
-  href: api/Robust.Client.WebView/
-
-#Loader Api
-- name: Robust.LoaderApi
-  href: api/Robust.LoaderApi/Robust.LoaderApi/
-  
-# Server
-- name: Robust.Server
-  href: api/Robust.Server/
-
-# Shared 
-- name: Robust.Shared
-  href: api/Robust.Shared/
-- name: Robust.Shared.Maths
-  href: api/Robust.Shared.Maths/
-- name: Robust.Shared.Scripting
-  href: api/Robust.Shared.Scripting/
-
-# Unit testing
-- name: Robust.UnitTesting
-  href: api/Robust.UnitTesting/

Robust.Server/BaseServer.cs

@@ -66,17 +66,18 @@ namespace Robust.Server
 
         [Dependency] private readonly IConfigurationManagerInternal _config = default!;
         [Dependency] private readonly IServerEntityManager _entityManager = default!;
+        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly ILogManager _log = default!;
         [Dependency] private readonly IRobustSerializer _serializer = default!;
         [Dependency] private readonly IGameTiming _time = default!;
         [Dependency] private readonly IResourceManagerInternal _resources = default!;
         [Dependency] private readonly IMapManager _mapManager = default!;
-        [Dependency] private readonly ITimerManager _timerManager = default!;
+        [Dependency] private readonly ITimerManager timerManager = default!;
         [Dependency] private readonly IServerGameStateManager _stateManager = default!;
         [Dependency] private readonly IServerNetManager _network = default!;
         [Dependency] private readonly ISystemConsoleManager _systemConsole = default!;
         [Dependency] private readonly ITaskManager _taskManager = default!;
-        [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
+        [Dependency] private readonly IRuntimeLog runtimeLog = default!;
         [Dependency] private readonly IModLoaderInternal _modLoader = default!;
         [Dependency] private readonly IWatchdogApi _watchdogApi = default!;
         [Dependency] private readonly HubManager _hubManager = default!;
@@ -126,7 +127,7 @@ namespace Robust.Server
             else
                 Logger.InfoS("srv", $"{reason}, shutting down...");
 
-            _shutdownReason = reason ?? "Shutting down";
+            _shutdownReason = reason;
 
             if (_mainLoop != null) _mainLoop.Running = false;
             if (_logHandler != null)
@@ -343,6 +344,7 @@ namespace Robust.Server
             _consoleHost.Initialize();
             _entityManager.Startup();
             _mapManager.Startup();
+            IoCManager.Resolve<IEntityLookup>().Startup();
             _stateManager.Initialize();
 
             var reg = _entityManager.ComponentFactory.GetRegistration<TransformComponent>();
@@ -601,6 +603,7 @@ namespace Robust.Server
             _network.Shutdown($"Server shutting down: {_shutdownReason}");
 
             // shutdown entities
+            IoCManager.Resolve<IEntityLookup>().Shutdown();
             _entityManager.Cleanup();
 
             if (_config.GetCVar(CVars.LogRuntimeLog))
@@ -611,7 +614,7 @@ namespace Robust.Server
                 Directory.CreateDirectory(relPath);
                 var pathToWrite = Path.Combine(relPath,
                     "Runtime-" + DateTime.Now.ToString("yyyy-MM-dd-THH-mm-ss") + ".txt");
-                File.WriteAllText(pathToWrite, _runtimeLog.Display(), EncodingHelpers.UTF8);
+                File.WriteAllText(pathToWrite, runtimeLog.Display(), EncodingHelpers.UTF8);
             }
 
             AppDomain.CurrentDomain.ProcessExit -= ProcessExiting;
@@ -656,8 +659,7 @@ namespace Robust.Server
 
             using (TickUsage.WithLabels("Timers").NewTimer())
             {
-                _consoleHost.CommandBufferExecute();
-                _timerManager.UpdateTimers(frameEventArgs);
+                timerManager.UpdateTimers(frameEventArgs);
             }
 
             using (TickUsage.WithLabels("AsyncTasks").NewTimer())
@@ -668,6 +670,8 @@ namespace Robust.Server
             // Pass Histogram into the IEntityManager.Update so it can do more granular measuring.
             _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false, TickUsage);
 
+            _lookup.Update();
+
             using (TickUsage.WithLabels("PostEngine").NewTimer())
             {
                 _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);

Robust.Server/Bql/BqlQuerySelector.Builtin.cs

@@ -311,7 +311,7 @@ namespace Robust.Server.Bql
         public override IEnumerable<EntityUid> DoSelection(IEnumerable<EntityUid> input, IReadOnlyList<object> arguments, bool isInverted, IEntityManager entityManager)
         {
             var radius = (float)(double)arguments[0];
-            var entityLookup = EntitySystem.Get<EntityLookupSystem>();
+            var entityLookup = IoCManager.Resolve<IEntityLookup>();
 
             // TODO: Make this a foreach and reduce LINQ chain because it'll allocate a LOT
             //BUG: GetEntitiesInRange effectively uses manhattan distance. This is not intended, near is supposed to be circular.

Robust.Server/Console/Commands/MapCommands.cs

@@ -29,13 +29,14 @@ namespace Robust.Server.Console.Commands
             var mapId = new MapId(int.Parse(args[0]));
 
             var mapMgr = IoCManager.Resolve<IMapManager>();
+            var pauseMgr = IoCManager.Resolve<IPauseManager>();
 
             if (!mapMgr.MapExists(mapId))
             {
                 mapMgr.CreateMap(mapId);
                 if (args.Length >= 2 && args[1] == "false")
                 {
-                    mapMgr.AddUninitializedMap(mapId);
+                    pauseMgr.AddUninitializedMap(mapId);
                 }
 
                 shell.WriteLine($"Map with ID {mapId} created.");
@@ -218,11 +219,7 @@ namespace Robust.Server.Console.Commands
             }
 
             IoCManager.Resolve<IMapLoader>().LoadMap(mapId, args[1]);
-
-            if (mapManager.MapExists(mapId))
-                shell.WriteLine($"Map {mapId} has been loaded from {args[1]}.");
-            else
-                shell.WriteError($"Error while loading map from {args[1]}.");
+            shell.WriteLine($"Map {mapId} has been loaded from {args[1]}.");
         }
     }
 
@@ -321,6 +318,7 @@ namespace Robust.Server.Console.Commands
             }
 
             var mapManager = IoCManager.Resolve<IMapManager>();
+            var pauseManager = IoCManager.Resolve<IPauseManager>();
 
             var arg = args[0];
             var mapId = new MapId(int.Parse(arg, CultureInfo.InvariantCulture));
@@ -331,13 +329,13 @@ namespace Robust.Server.Console.Commands
                 return;
             }
 
-            if (mapManager.IsMapInitialized(mapId))
+            if (pauseManager.IsMapInitialized(mapId))
             {
                 shell.WriteError("Map is already initialized!");
                 return;
             }
 
-            mapManager.DoMapInitialize(mapId);
+            pauseManager.DoMapInitialize(mapId);
         }
     }
 
@@ -350,16 +348,17 @@ namespace Robust.Server.Console.Commands
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
             var mapManager = IoCManager.Resolve<IMapManager>();
+            var pauseManager = IoCManager.Resolve<IPauseManager>();
 
             var msg = new StringBuilder();
 
             foreach (var mapId in mapManager.GetAllMapIds().OrderBy(id => id.Value))
             {
                 msg.AppendFormat("{0}: init: {1}, paused: {2}, ent: {3}, grids: {4}\n",
-                    mapId, mapManager.IsMapInitialized(mapId),
-                    mapManager.IsMapPaused(mapId),
-                    mapManager.GetMapEntityId(mapId),
-                    string.Join(",", mapManager.GetAllMapGrids(mapId).Select(grid => grid.Index)));
+                    mapId, pauseManager.IsMapInitialized(mapId),
+                    pauseManager.IsMapPaused(mapId),
+                    string.Join(",", mapManager.GetAllMapGrids(mapId).Select(grid => grid.Index)),
+                    mapManager.GetMapEntityId(mapId));
             }
 
             shell.WriteLine(msg.ToString());
@@ -381,7 +380,7 @@ namespace Robust.Server.Console.Commands
             foreach (var grid in mapManager.GetAllGrids().OrderBy(grid => grid.Index.Value))
             {
                 msg.AppendFormat("{0}: map: {1}, ent: {2}, pos: {3} \n",
-                    grid.Index, grid.ParentMapId, grid.GridEntityId, grid.WorldPosition);
+                    grid.Index, grid.ParentMapId, grid.WorldPosition, grid.GridEntityId);
             }
 
             shell.WriteLine(msg.ToString());

Robust.Server/Console/Commands/TestbedCommand.cs

@@ -109,8 +109,9 @@ namespace Robust.Server.Console.Commands
         private void SetupPlayer(MapId mapId, IConsoleShell shell, IPlayerSession? player, IMapManager mapManager)
         {
             if (mapId == MapId.Nullspace) return;
-            mapManager.SetMapPaused(mapId, false);
-            var mapUid = mapManager.GetMapEntityIdOrThrow(mapId);
+            var pauseManager = IoCManager.Resolve<IPauseManager>();
+            pauseManager.SetMapPaused(mapId, false);
+            var mapUid = IoCManager.Resolve<IMapManager>().GetMapEntityIdOrThrow(mapId);
             IoCManager.Resolve<IEntityManager>().GetComponent<SharedPhysicsMapComponent>(mapUid).Gravity = new Vector2(0, -9.8f);
 
             return;

Robust.Server/GameObjects/EntitySystems/AppearanceSystem.cs

@@ -3,7 +3,7 @@ using Robust.Shared.GameStates;
 
 namespace Robust.Server.GameObjects;
 
-public sealed class AppearanceSystem : SharedAppearanceSystem
+internal sealed class AppearanceSystem : SharedAppearanceSystem
 {
     public override void Initialize()
     {

Robust.Server/GameObjects/EntitySystems/PhysicsSystem.cs

@@ -1,4 +1,4 @@
-using JetBrains.Annotations;
+using JetBrains.Annotations;
 using Robust.Server.Physics;
 using Robust.Shared;
 using Robust.Shared.Configuration;
@@ -37,7 +37,7 @@ namespace Robust.Server.GameObjects
             collideComp.BodyType = BodyType.Static;
         }
 
-        protected override void HandleMapCreated(MapChangedEvent eventArgs)
+        protected override void HandleMapCreated(object? sender, MapEventArgs eventArgs)
         {
             if (eventArgs.Map == MapId.Nullspace) return;
             var mapUid = MapManager.GetMapEntityIdOrThrow(eventArgs.Map);

Robust.Server/GameStates/ChunkIndicesEnumerator.cs

@@ -5,31 +5,30 @@ namespace Robust.Server.GameStates;
 
 public struct ChunkIndicesEnumerator
 {
-    private Vector2i _bottomLeft;
-    private Vector2i _topRight;
+    private Vector2i _topLeft;
+    private Vector2i _bottomRight;
 
     private int _x;
     private int _y;
 
-    public ChunkIndicesEnumerator(Vector2 viewPos, float range, float chunkSize)
+    public ChunkIndicesEnumerator(Box2 viewBox, float chunkSize)
     {
-        _bottomLeft = ((viewPos - range) / chunkSize).Floored();
-        // Also floor this as we get the whole chunk anyway.
-        _topRight = ((viewPos + range) / chunkSize).Floored();
+        _topLeft = (viewBox.TopLeft / chunkSize).Floored();
+        _bottomRight = (viewBox.BottomRight / chunkSize).Floored();
 
-        _x = _bottomLeft.X;
-        _y = _bottomLeft.Y;
+        _x = _topLeft.X;
+        _y = _bottomRight.Y;
     }
 
     public bool MoveNext([NotNullWhen(true)] out Vector2i? chunkIndices)
     {
-        if (_y > _topRight.Y)
+        if (_y > _topLeft.Y)
         {
             _x++;
-            _y = _bottomLeft.Y;
+            _y = _bottomRight.Y;
         }
 
-        if (_x > _topRight.X)
+        if (_x > _bottomRight.X)
         {
             chunkIndices = null;
             return false;

Robust.Server/GameStates/PVSCollection.cs

@@ -37,6 +37,7 @@ public interface IPVSCollection
 public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : IComparable<TIndex>, IEquatable<TIndex>
 {
     [Shared.IoC.Dependency] private readonly IEntityManager _entityManager = default!;
+    [Shared.IoC.Dependency] private readonly IMapManager _mapManager = default!;
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static Vector2i GetChunkIndices(Vector2 coordinates)
@@ -80,14 +81,14 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     private readonly List<(GameTick tick, TIndex index)> _deletionHistory = new();
 
     /// <summary>
-    /// An index containing the <see cref="IIndexLocation"/>s of all <see cref="TIndex"/>.
+    /// An index containing the <see cref="IndexLocation"/>s of all <see cref="TIndex"/>.
     /// </summary>
-    private readonly Dictionary<TIndex, IIndexLocation> _indexLocations = new();
+    private readonly Dictionary<TIndex, IndexLocation> _indexLocations = new();
 
     /// <summary>
     /// Buffer of all locationchanges since the last process call
     /// </summary>
-    private readonly Dictionary<TIndex, IIndexLocation> _locationChangeBuffer = new();
+    private readonly Dictionary<TIndex, IndexLocation> _locationChangeBuffer = new();
     /// <summary>
     /// Buffer of all indexremovals since the last process call
     /// </summary>
@@ -102,7 +103,7 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     {
         var changedIndices = new HashSet<TIndex>(_locationChangeBuffer.Keys);
 
-        var changedChunkLocations = new HashSet<IIndexLocation>();
+        var changedChunkLocations = new HashSet<IndexLocation>();
         foreach (var (index, tick) in _removalBuffer)
         {
             //changes dont need to be computed if we are removing the index anyways
@@ -153,7 +154,7 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
 
     public HashSet<TIndex>.Enumerator GetElementsForSession(ICommonSession session) => _localOverrides[session].GetEnumerator();
 
-    private void AddIndexInternal(TIndex index, IIndexLocation location)
+    private void AddIndexInternal(TIndex index, IndexLocation location)
     {
         switch (location)
         {
@@ -185,7 +186,7 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
         _indexLocations.Add(index, location);
     }
 
-    private IIndexLocation? RemoveIndexInternal(TIndex index)
+    private IndexLocation? RemoveIndexInternal(TIndex index)
     {
         // the index might be gone due to disconnects/grid-/map-deletions
         if (!_indexLocations.TryGetValue(index, out var location))
@@ -351,14 +352,14 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
         var gridId = coordinates.GetGridId(_entityManager);
         if (gridId != GridId.Invalid)
         {
-            var gridIndices = GetChunkIndices(coordinates.Position);
+            var gridIndices = GetChunkIndices(_mapManager.GetGrid(gridId).LocalToGrid(coordinates));
             UpdateIndex(index, gridId, gridIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
             return;
         }
 
-        var mapCoordinates = coordinates.ToMap(_entityManager);
-        var mapIndices = GetChunkIndices(coordinates.Position);
-        UpdateIndex(index, mapCoordinates.MapId, mapIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
+        var mapId = coordinates.GetMapId(_entityManager);
+        var mapIndices = GetChunkIndices(coordinates.ToMapPos(_entityManager));
+        UpdateIndex(index, mapId, mapIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
     }
 
     /// <summary>
@@ -391,7 +392,7 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
         RegisterUpdate(index, new MapChunkLocation(mapId, chunkIndices));
     }
 
-    private void RegisterUpdate(TIndex index, IIndexLocation location)
+    private void RegisterUpdate(TIndex index, IndexLocation location)
     {
         if(_indexLocations.TryGetValue(index, out var oldLocation) && oldLocation == location) return;
 
@@ -399,78 +400,14 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     }
 
     #endregion
+
+    #region IndexLocations
+
+    private abstract record IndexLocation;
+    private record MapChunkLocation(MapId MapId, Vector2i ChunkIndices) : IndexLocation;
+    private record GridChunkLocation(GridId GridId, Vector2i ChunkIndices) : IndexLocation;
+    private record GlobalOverride : IndexLocation;
+    private record LocalOverride(ICommonSession Session) : IndexLocation;
+
+    #endregion
 }
-
-#region IndexLocations
-
-public interface IIndexLocation {};
-
-public interface IChunkIndexLocation{ };
-
-public struct MapChunkLocation : IIndexLocation, IChunkIndexLocation, IEquatable<MapChunkLocation>
-{
-    public MapChunkLocation(MapId mapId, Vector2i chunkIndices)
-    {
-        MapId = mapId;
-        ChunkIndices = chunkIndices;
-    }
-
-    public MapId MapId { get; init; }
-    public Vector2i ChunkIndices { get; init; }
-
-    public bool Equals(MapChunkLocation other)
-    {
-        return MapId.Equals(other.MapId) && ChunkIndices.Equals(other.ChunkIndices);
-    }
-
-    public override bool Equals(object? obj)
-    {
-        return obj is MapChunkLocation other && Equals(other);
-    }
-
-    public override int GetHashCode()
-    {
-        return HashCode.Combine(MapId, ChunkIndices);
-    }
-}
-
-public struct GridChunkLocation : IIndexLocation, IChunkIndexLocation, IEquatable<GridChunkLocation>
-{
-    public GridChunkLocation(GridId gridId, Vector2i chunkIndices)
-    {
-        GridId = gridId;
-        ChunkIndices = chunkIndices;
-    }
-
-    public GridId GridId { get; init; }
-    public Vector2i ChunkIndices { get; init; }
-
-    public bool Equals(GridChunkLocation other)
-    {
-        return GridId.Equals(other.GridId) && ChunkIndices.Equals(other.ChunkIndices);
-    }
-
-    public override bool Equals(object? obj)
-    {
-        return obj is GridChunkLocation other && Equals(other);
-    }
-
-    public override int GetHashCode()
-    {
-        return HashCode.Combine(GridId, ChunkIndices);
-    }
-}
-
-public struct GlobalOverride : IIndexLocation { }
-
-public struct LocalOverride : IIndexLocation
-{
-    public LocalOverride(ICommonSession session)
-    {
-        Session = session;
-    }
-
-    public ICommonSession Session { get; init; }
-}
-
-#endregion

Robust.Server/GameStates/RobustTree.cs

@@ -1,174 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using Microsoft.Extensions.ObjectPool;
-
-namespace Robust.Server.GameStates;
-
-public sealed class RobustTree<T> where T : notnull
-{
-    private Dictionary<T, TreeNode> _nodeIndex = new();
-
-    private Dictionary<T, T> _parents = new();
-    public readonly HashSet<T> RootNodes = new();
-
-    private ObjectPool<HashSet<T>> _pool;
-
-    public RobustTree(ObjectPool<HashSet<T>>? pool = null)
-    {
-        _pool = pool ?? new DefaultObjectPool<HashSet<T>>(new PVSSystem.SetPolicy<T>());
-    }
-
-    public void Clear()
-    {
-        foreach (var value in _nodeIndex.Values)
-        {
-            if(value.Children != null)
-                _pool.Return(value.Children);
-        }
-        _nodeIndex.Clear();
-        _parents.Clear();
-        RootNodes.Clear();
-    }
-
-    public TreeNode this[T index] => _nodeIndex[index];
-
-    public void Remove(T value, bool mend = false)
-    {
-        if (!_nodeIndex.TryGetValue(value, out var node))
-            throw new InvalidOperationException("Node doesnt exist.");
-
-
-        if (RootNodes.Contains(value))
-        {
-            if (node.Children != null)
-            {
-                foreach (var child in node.Children)
-                {
-                    _parents.Remove(child);
-                    RootNodes.Add(child);
-                }
-                _pool.Return(node.Children);
-            }
-            RootNodes.Remove(value);
-            _nodeIndex.Remove(value);
-            return;
-        }
-
-        if (_parents.TryGetValue(value, out var parent))
-        {
-            if (node.Children != null)
-            {
-                foreach (var child in node.Children)
-                {
-                    if (mend)
-                    {
-                        _parents[child] = parent;
-                        var children = _nodeIndex[parent].Children;
-                        if (children == null)
-                        {
-                            children = _pool.Get();
-                            _nodeIndex[parent] = _nodeIndex[parent].WithChildren(children);
-                        }
-                        children.Add(child);
-                    }
-                    else
-                    {
-                        _parents.Remove(child);
-                        RootNodes.Add(child);
-                    }
-                }
-
-                _pool.Return(node.Children);
-            }
-            _parents.Remove(value);
-            _nodeIndex.Remove(value);
-        }
-
-        throw new InvalidOperationException("Node neither had a parent nor was a RootNode.");
-    }
-
-    public TreeNode Set(T rootNode)
-    {
-        //root node, for now
-        if (_nodeIndex.TryGetValue(rootNode, out var node))
-        {
-            if(!RootNodes.Contains(rootNode))
-                throw new InvalidOperationException("Node already exists as non-root node.");
-            return node;
-        }
-
-        node = new TreeNode(rootNode);
-        _nodeIndex.Add(rootNode, node);
-        RootNodes.Add(rootNode);
-        return node;
-    }
-
-    public TreeNode Set(T child, T parent)
-    {
-        if (!_nodeIndex.TryGetValue(parent, out var parentNode))
-            parentNode = Set(parent);
-
-        if (parentNode.Children == null)
-        {
-            _nodeIndex[parent] = parentNode = parentNode.WithChildren(_pool.Get());
-        }
-
-        if (_nodeIndex.TryGetValue(child, out var existingNode))
-        {
-            if (RootNodes.Contains(child))
-            {
-                parentNode.Children!.Add(existingNode.Value);
-                RootNodes.Remove(child);
-                _parents.Add(child, parent);
-                return existingNode;
-            }
-
-            if (!_parents.TryGetValue(child, out var previousParent) || _nodeIndex.TryGetValue(previousParent, out var previousParentNode))
-                throw new InvalidOperationException("Could not find old parent for non-root node.");
-
-            previousParentNode.Children?.Remove(existingNode.Value);
-            parentNode.Children!.Add(existingNode.Value);
-            _parents[child] = parent;
-            return existingNode;
-        }
-
-        existingNode = new TreeNode(child);
-        _nodeIndex.Add(child, existingNode);
-        parentNode.Children!.Add(existingNode.Value);
-        _parents.Add(child, parent);
-        return existingNode;
-    }
-
-    public readonly struct TreeNode : IEquatable<TreeNode>
-    {
-        public readonly T Value;
-        public readonly HashSet<T>? Children;
-
-        public TreeNode(T value, HashSet<T>? children = null)
-        {
-            Value = value;
-            Children = children;
-        }
-
-        public bool Equals(TreeNode other)
-        {
-            return Value.Equals(other.Value) && Children?.Equals(other.Children) == true;
-        }
-
-        public override bool Equals(object? obj)
-        {
-            return obj is TreeNode other && Equals(other);
-        }
-
-        public override int GetHashCode()
-        {
-            return HashCode.Combine(Value, Children);
-        }
-
-        public TreeNode WithChildren(HashSet<T> children)
-        {
-            return new TreeNode(Value, children);
-        }
-    }
-}

Robust.Server/GameStates/ServerGameStateManager.cs

@@ -1,12 +1,9 @@
 using System;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using JetBrains.Annotations;
-using Microsoft.CodeAnalysis;
-using Microsoft.Extensions.ObjectPool;
 using Robust.Server.GameObjects;
 using Robust.Server.Player;
 using Robust.Shared.Enums;
@@ -128,37 +125,6 @@ namespace Robust.Server.GameStates
             // people not in the game don't get states
             var players = _playerManager.ServerSessions.Where(o => o.Status == SessionStatus.InGame).ToArray();
 
-            //todo paul oh my god make this less shit
-            EntityQuery<MetaDataComponent> metadataQuery = default!;
-            EntityQuery<TransformComponent> transformQuery = default!;
-            HashSet<int>[] playerChunks = default!;
-            EntityUid[][] viewerEntities = default!;
-            (Dictionary<EntityUid, MetaDataComponent> metadata, RobustTree<EntityUid> tree)?[] chunkCache = default!;
-
-            if (_pvs.CullingEnabled)
-            {
-                List<(uint, IChunkIndexLocation)> chunks;
-                (chunks, playerChunks, viewerEntities) = _pvs.GetChunks(players);
-                const int ChunkBatchSize = 2;
-                var chunksCount = chunks.Count;
-                var chunkBatches = (int) MathF.Ceiling((float) chunksCount / ChunkBatchSize);
-                chunkCache =
-                    new (Dictionary<EntityUid, MetaDataComponent> metadata, RobustTree<EntityUid> tree)?[chunksCount];
-                transformQuery = _entityManager.GetEntityQuery<TransformComponent>();
-                metadataQuery = _entityManager.GetEntityQuery<MetaDataComponent>();
-                Parallel.For(0, chunkBatches, i =>
-                {
-                    var start = i * ChunkBatchSize;
-                    var end = Math.Min(start + ChunkBatchSize, chunksCount);
-
-                    for (var j = start; j < end; ++j)
-                    {
-                        var (visMask, chunkIndexLocation) = chunks[j];
-                        chunkCache[j] = _pvs.CalculateChunk(chunkIndexLocation, visMask, transformQuery, metadataQuery);
-                    }
-                });
-            }
-
             const int BatchSize = 2;
             var batches = (int) MathF.Ceiling((float) players.Length / BatchSize);
 
@@ -169,9 +135,11 @@ namespace Robust.Server.GameStates
 
                 for (var j = start; j < end; ++j)
                 {
+                    var session = players[j];
+
                     try
                     {
-                        SendStateUpdate(j);
+                        SendStateUpdate(session);
                     }
                     catch (Exception e) // Catch EVERY exception
                     {
@@ -180,10 +148,8 @@ namespace Robust.Server.GameStates
                 }
             });
 
-            void SendStateUpdate(int sessionIndex)
+            void SendStateUpdate(IPlayerSession session)
             {
-                var session = players[sessionIndex];
-
                 // KILL IT WITH FIRE
                 if(mainThread != Thread.CurrentThread)
                     IoCManager.InitThread(new DependencyCollection(parentDeps), true);
@@ -195,10 +161,7 @@ namespace Robust.Server.GameStates
                     DebugTools.Assert("Why does this channel not have an entry?");
                 }
 
-                var (entStates, deletions) = _pvs.CullingEnabled
-                    ? _pvs.CalculateEntityStates(session, lastAck, _gameTiming.CurTick, chunkCache,
-                        playerChunks[sessionIndex], metadataQuery, transformQuery, viewerEntities[sessionIndex])
-                    : _pvs.GetAllEntityStates(session, lastAck, _gameTiming.CurTick);
+                var (entStates, deletions) = _pvs.CalculateEntityStates(session, lastAck, _gameTiming.CurTick);
                 var playerStates = _playerManager.GetPlayerStates(lastAck);
                 var mapData = _mapManager.GetStateData(lastAck);
 
@@ -209,6 +172,8 @@ namespace Robust.Server.GameStates
 
                 InterlockedHelper.Min(ref oldestAckValue, lastAck.Value);
 
+                DebugTools.Assert(state.MapData?.CreatedMaps is null || (state.MapData?.CreatedMaps is not null && state.EntityStates.HasContents), "Sending new maps, but no entity state.");
+
                 // actually send the state
                 var stateUpdateMessage = _networkManager.CreateNetMessage<MsgState>();
                 stateUpdateMessage.State = state;
@@ -229,8 +194,6 @@ namespace Robust.Server.GameStates
                 _networkManager.ServerSendMessage(stateUpdateMessage, channel);
             }
 
-            if(_pvs.CullingEnabled)
-                _pvs.ReturnToPool(chunkCache, playerChunks);
             _pvs.Cleanup(_playerManager.ServerSessions);
             var oldestAck = new GameTick(oldestAckValue);
 

Robust.Server/Maps/MapLoader.cs

@@ -24,6 +24,7 @@ using Robust.Shared.Serialization.Markdown.Mapping;
 using Robust.Shared.Serialization.Markdown.Validation;
 using Robust.Shared.Serialization.Markdown.Value;
 using Robust.Shared.Serialization.TypeSerializers.Interfaces;
+using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using YamlDotNet.Core;
 using YamlDotNet.RepresentationModel;
@@ -43,6 +44,7 @@ namespace Robust.Server.Maps
         [Dependency] private readonly IMapManagerInternal _mapManager = default!;
         [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
         [Dependency] private readonly IServerEntityManagerInternal _serverEntityManager = default!;
+        [Dependency] private readonly IPauseManager _pauseManager = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
 
         public event Action<YamlStream, string>? LoadedMapData;
@@ -52,7 +54,7 @@ namespace Robust.Server.Maps
         {
             var grid = _mapManager.GetGrid(gridId);
 
-            var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _prototypeManager);
+            var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _pauseManager, _prototypeManager);
             context.RegisterGrid(grid);
             var root = context.Serialize();
             var document = new YamlDocument(root);
@@ -98,7 +100,7 @@ namespace Robust.Server.Maps
                     throw new InvalidDataException("Cannot instance map with multiple grids as blueprint.");
                 }
 
-                var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager,
+                var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _pauseManager,
                     _prototypeManager, (YamlMappingNode) data.RootNode, mapId, options);
                 context.Deserialize();
                 grid = context.Grids[0];
@@ -118,7 +120,7 @@ namespace Robust.Server.Maps
                     _serverEntityManager.GetComponent<MetaDataComponent>(entity).EntityLifeStage = EntityLifeStage.MapInitialized;
                 }
             }
-            else if (_mapManager.IsMapInitialized(mapId))
+            else if (_pauseManager.IsMapInitialized(mapId))
             {
                 foreach (var entity in context.Entities)
                 {
@@ -126,7 +128,7 @@ namespace Robust.Server.Maps
                 }
             }
 
-            if (_mapManager.IsMapPaused(mapId))
+            if (_pauseManager.IsMapPaused(mapId))
             {
                 foreach (var entity in context.Entities)
                 {
@@ -139,7 +141,7 @@ namespace Robust.Server.Maps
         public void SaveMap(MapId mapId, string yamlPath)
         {
             Logger.InfoS("map", $"Saving map {mapId} to {yamlPath}");
-            var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _prototypeManager);
+            var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _pauseManager, _prototypeManager);
             foreach (var grid in _mapManager.GetAllMapGrids(mapId))
             {
                 context.RegisterGrid(grid);
@@ -205,7 +207,7 @@ namespace Robust.Server.Maps
 
                 LoadedMapData?.Invoke(data.Stream, resPath.ToString());
 
-                var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager,
+                var context = new MapContext(_mapManager, _tileDefinitionManager, _serverEntityManager, _pauseManager,
                     _prototypeManager, (YamlMappingNode) data.RootNode, mapId, options);
                 context.Deserialize();
 
@@ -224,12 +226,12 @@ namespace Robust.Server.Maps
             private readonly IMapManagerInternal _mapManager;
             private readonly ITileDefinitionManager _tileDefinitionManager;
             private readonly IServerEntityManagerInternal _serverEntityManager;
+            private readonly IPauseManager _pauseManager;
             private readonly IPrototypeManager _prototypeManager;
 
             private readonly MapLoadOptions? _loadOptions;
             private readonly Dictionary<GridId, int> GridIDMap = new();
             public readonly List<MapGrid> Grids = new();
-            private readonly List<GridId> _readGridIndices = new();
 
             private readonly Dictionary<EntityUid, int> EntityUidMap = new();
             private readonly Dictionary<int, EntityUid> UidEntityMap = new();
@@ -258,11 +260,12 @@ namespace Robust.Server.Maps
             public bool MapIsPostInit { get; private set; }
 
             public MapContext(IMapManagerInternal maps, ITileDefinitionManager tileDefs,
-                IServerEntityManagerInternal entities, IPrototypeManager prototypeManager)
+                IServerEntityManagerInternal entities, IPauseManager pauseManager, IPrototypeManager prototypeManager)
             {
                 _mapManager = maps;
                 _tileDefinitionManager = tileDefs;
                 _serverEntityManager = entities;
+                _pauseManager = pauseManager;
                 _prototypeManager = prototypeManager;
 
                 RootNode = new YamlMappingNode();
@@ -280,12 +283,13 @@ namespace Robust.Server.Maps
 
             public MapContext(IMapManagerInternal maps, ITileDefinitionManager tileDefs,
                 IServerEntityManagerInternal entities,
-                IPrototypeManager prototypeManager,
+                IPauseManager pauseManager, IPrototypeManager prototypeManager,
                 YamlMappingNode node, MapId targetMapId, MapLoadOptions options)
             {
                 _mapManager = maps;
                 _tileDefinitionManager = tileDefs;
                 _serverEntityManager = entities;
+                _pauseManager = pauseManager;
                 _loadOptions = options;
 
                 RootNode = node;
@@ -315,8 +319,9 @@ namespace Robust.Server.Maps
                 // Create the new map.
                 AllocMap();
 
-                // Maps grid section indices to GridIds, for deserializing GridIds on entities.
-                ReadGridSectionIndices();
+                // Load grids.
+                ReadTileMapSection();
+                ReadGridSection();
 
                 // Entities are first allocated. This allows us to know the future UID of all entities on the map before
                 // even ExposeData is loaded. This allows us to resolve serialized EntityUid instances correctly.
@@ -325,11 +330,8 @@ namespace Robust.Server.Maps
                 // Actually instance components and run ExposeData on them.
                 FinishEntitiesLoad();
 
-                // Load grids.
-                ReadTileMapSection();
-
-                // Reads the grid section, allocates MapGrids, and maps them to their respective MapGridComponents.
-                ReadGridSection();
+                // Finish binding MapGrids to their respective MapGridComponents.
+                BindGridComponents();
 
                 // Clear the net tick numbers so that components from prototypes (not modified by map)
                 // aren't sent over the wire initially.
@@ -477,20 +479,18 @@ namespace Robust.Server.Maps
                 }
             }
 
-            private void ReadGridSection()
+            private void BindGridComponents()
             {
                 // There were no new grids, nothing to do here.
-                if(_readGridIndices.Count == 0)
+                if(Grids.Count == 0)
                     return;
 
                 // MapGrids already contain their assigned GridId from their ctor, and the MapComponents just got deserialized.
                 // Now we need to actually bind the MapGrids to their components so that you can resolve GridId -> EntityUid
                 // After doing this, it should be 100% safe to use the MapManager API like normal.
 
-                var yamlGrids = RootNode.GetNode<YamlSequenceNode>("grids");
-
                 // get ents that the grids will bind to
-                var gridComps = new Dictionary<GridId, MapGridComponent>(_readGridIndices.Count);
+                var gridComps = new Dictionary<GridId, MapGridComponent>(Grids.Count);
 
                 // linear search for new grid comps
                 foreach (var tuple in _entitiesToDeserialize)
@@ -507,54 +507,15 @@ namespace Robust.Server.Maps
                     gridComps[gridComp.GridIndex] = gridComp;
                 }
 
-                for (var index = 0; index < _readGridIndices.Count; index++)
+                // Actually bind them
+                foreach (var mapGrid in Grids)
                 {
-                    // Here is where the implicit index pairing magic happens from the yaml.
-                    var gridIndex = _readGridIndices[index];
-                    var yamlGrid = (YamlMappingNode)yamlGrids.Children[index];
-
                     // designed to throw if something is broken, every grid must map to an ent
-                    var gridComp = gridComps[gridIndex];
-
-                    DebugTools.Assert(gridComp.GridIndex == gridIndex);
-
-                    YamlMappingNode yamlGridInfo = (YamlMappingNode)yamlGrid["settings"];
-                    YamlSequenceNode yamlGridChunks = (YamlSequenceNode)yamlGrid["chunks"];
-
-                    var grid = AllocateMapGrid(gridComp, yamlGridInfo);
-
-                    foreach (var chunkNode in yamlGridChunks.Cast<YamlMappingNode>())
-                    {
-                        YamlGridSerializer.DeserializeChunk(_mapManager, grid, chunkNode, _tileMap!, _tileDefinitionManager);
-                    }
-
-                    Grids.Add(grid); // Grids are kept in index order
+                    var gridComp = gridComps[mapGrid.Index];
+                    _mapManager.BindGrid(gridComp, mapGrid);
                 }
             }
 
-            private static MapGrid AllocateMapGrid(MapGridComponent gridComp, YamlMappingNode yamlGridInfo)
-            {
-                // sane defaults
-                ushort csz = 16;
-                ushort tsz = 1;
-
-                foreach (var kvInfo in yamlGridInfo)
-                {
-                    var key = kvInfo.Key.ToString();
-                    var val = kvInfo.Value.ToString();
-                    if (key == "chunksize")
-                        csz = ushort.Parse(val);
-                    else if (key == "tilesize")
-                        tsz = ushort.Parse(val);
-                    else if (key == "snapsize")
-                        continue; // obsolete
-                }
-
-                var grid = gridComp.AllocMapGrid(csz, tsz);
-
-                return grid;
-            }
-
             private void AttachMapEntities()
             {
                 var mapEntity = _mapManager.GetMapEntityIdOrThrow(TargetMap);
@@ -621,15 +582,21 @@ namespace Robust.Server.Maps
                 }
             }
 
-            private void ReadGridSectionIndices()
+            private void ReadGridSection()
             {
-                // sets up the mapping so the serializer can properly deserialize GridIds.
-
                 var yamlGrids = RootNode.GetNode<YamlSequenceNode>("grids");
 
-                for (var i = 0; i < yamlGrids.Children.Count; i++)
+                foreach (var yamlGrid in yamlGrids)
                 {
-                    _readGridIndices.Add(_mapManager.GenerateGridId(null));
+                    var grid = YamlGridSerializer.DeserializeGrid(
+                        _mapManager, TargetMap,
+                        (YamlMappingNode) yamlGrid["settings"],
+                        (YamlSequenceNode) yamlGrid["chunks"],
+                        _tileMap!,
+                        _tileDefinitionManager
+                    );
+
+                    Grids.Add(grid);
                 }
             }
 
@@ -645,7 +612,7 @@ namespace Robust.Server.Maps
 
                     if (!MapIsPostInit)
                     {
-                        _mapManager.AddUninitializedMap(TargetMap);
+                        _pauseManager.AddUninitializedMap(TargetMap);
                     }
                 }
             }
@@ -752,7 +719,7 @@ namespace Robust.Server.Maps
                 var isPostInit = false;
                 foreach (var grid in Grids)
                 {
-                    if (_mapManager.IsMapInitialized(grid.ParentMapId))
+                    if (_pauseManager.IsMapInitialized(grid.ParentMapId))
                     {
                         isPostInit = true;
                         break;
@@ -961,13 +928,6 @@ namespace Robust.Server.Maps
                 return true;
             }
 
-            [Virtual]
-            public class MapLoadException : Exception
-            {
-                public MapLoadException(string? message)
-                    : base(message) { }
-            }
-
             public DeserializationResult Read(ISerializationManager serializationManager, ValueDataNode node,
                 IDependencyCollection dependencies,
                 bool skipHook,
@@ -976,18 +936,19 @@ namespace Robust.Server.Maps
                 // This is the code that deserializes the Grids index into the GridId. This has to happen between Grid allocation
                 // and when grids are bound to their entities.
 
-                if (node.Value == "null")
-                {
-                    throw new MapLoadException($"Error in map file: found local grid ID '{node.Value}' which does not exist.");
-                }
+                if (node.Value == "null") return new DeserializedValue<GridId>(GridId.Invalid);
 
                 var val = int.Parse(node.Value);
-                if (val >= _readGridIndices.Count)
+                if (val >= Grids.Count)
                 {
-                    throw new MapLoadException($"Error in map file: found local grid ID '{val}' which does not exist.");
+                    Logger.ErrorS("map", "Error in map file: found local grid ID '{0}' which does not exist.", val);
+                }
+                else
+                {
+                    return new DeserializedValue<GridId>(Grids[val].Index);
                 }
 
-                return new DeserializedValue<GridId>(_readGridIndices[val]);
+                return new DeserializedValue<GridId>(GridId.Invalid);
             }
 
             ValidationNode ITypeValidator<EntityUid, ValueDataNode>.Validate(ISerializationManager serializationManager,

Robust.Server/Maps/YamlGridSerializer.cs

@@ -36,7 +36,7 @@ namespace Robust.Server.Maps
             return gridn;
         }
 
-        private static YamlNode SerializeChunk(MapChunk chunk)
+        private static YamlNode SerializeChunk(IMapChunk chunk)
         {
             var root = new YamlMappingNode();
             var value = new YamlScalarNode($"{chunk.X},{chunk.Y}");
@@ -51,7 +51,7 @@ namespace Robust.Server.Maps
             return root;
         }
 
-        private static string SerializeTiles(MapChunk chunk)
+        private static string SerializeTiles(IMapChunk chunk)
         {
             // number of bytes written per tile, because sizeof(Tile) is useless.
             const int structSize = 4;
@@ -68,8 +68,7 @@ namespace Robust.Server.Maps
                     {
                         var tile = chunk.GetTile(x, y);
                         writer.Write(tile.TypeId);
-                        writer.Write((byte)tile.Flags);
-                        writer.Write(tile.Variant);
+                        writer.Write(tile.Data);
                     }
                 }
             }
@@ -77,10 +76,38 @@ namespace Robust.Server.Maps
             return Convert.ToBase64String(barr);
         }
 
-        public static void DeserializeChunk(IMapManager mapMan, IMapGridInternal grid,
-            YamlMappingNode chunkData,
-            IReadOnlyDictionary<ushort, string> tileDefMapping,
+        public static MapGrid DeserializeGrid(IMapManagerInternal mapMan, MapId mapId, YamlMappingNode info,
+            YamlSequenceNode chunks, IReadOnlyDictionary<ushort, string> tileDefMapping,
             ITileDefinitionManager tileDefinitionManager)
+        {
+            ushort csz = 0;
+            ushort tsz = 0;
+            float sgsz = 0.0f;
+
+            foreach (var kvInfo in info)
+            {
+                var key = kvInfo.Key.ToString();
+                var val = kvInfo.Value.ToString();
+                if (key == "chunksize")
+                    csz = ushort.Parse(val);
+                else if (key == "tilesize")
+                    tsz = ushort.Parse(val);
+                else if (key == "snapsize")
+                    sgsz = float.Parse(val, CultureInfo.InvariantCulture);
+            }
+
+            //TODO: Pass in options
+            var grid = mapMan.CreateUnboundGrid(mapId);
+
+            foreach (var chunkNode in chunks.Cast<YamlMappingNode>())
+            {
+                DeserializeChunk(mapMan, grid, chunkNode, tileDefMapping, tileDefinitionManager);
+            }
+
+            return grid;
+        }
+
+        private static void DeserializeChunk(IMapManager mapMan, IMapGridInternal grid, YamlMappingNode chunkData, IReadOnlyDictionary<ushort, string> tileDefMapping, ITileDefinitionManager tileDefinitionManager)
         {
             var indNode = chunkData["ind"];
             var tileNode = chunkData["tiles"];
@@ -102,13 +129,12 @@ namespace Robust.Server.Maps
                 for (ushort x = 0; x < grid.ChunkSize; x++)
                 {
                     var id = reader.ReadUInt16();
-                    var flags = (TileRenderFlag)reader.ReadByte();
-                    var variant = reader.ReadByte();
+                    var data = reader.ReadUInt16();
 
                     var defName = tileDefMapping[id];
                     id = tileDefinitionManager[defName].TileId;
 
-                    var tile = new Tile(id, flags, variant);
+                    var tile = new Tile(id, data);
                     chunk.SetTile(x, y, tile);
                 }
             }

Robust.Server/Placement/PlacementManager.cs

@@ -209,7 +209,7 @@ namespace Robust.Server.Placement
         {
             EntityCoordinates start = msg.EntityCoordinates;
             Vector2 rectSize = msg.RectSize;
-            foreach (EntityUid entity in EntitySystem.Get<EntityLookupSystem>().GetEntitiesIntersecting(start.GetMapId(_entityManager),
+            foreach (EntityUid entity in IoCManager.Resolve<IEntityLookup>().GetEntitiesIntersecting(start.GetMapId(_entityManager),
                 new Box2(start.Position, start.Position + rectSize)))
             {
                 if (_entityManager.Deleted(entity) || _entityManager.HasComponent<IMapGridComponent>(entity) || _entityManager.HasComponent<ActorComponent>(entity))

Robust.Server/Robust.Server.csproj

@@ -10,12 +10,12 @@
   </PropertyGroup>
   <Import Project="..\MSBuild\Robust.DefineConstants.targets" />
   <ItemGroup>
-    <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="All" />
+    <PackageReference Include="JetBrains.Annotations" Version="2020.3.0" PrivateAssets="All" />
     <!--  -->
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.0.7" />
     <PackageReference Include="prometheus-net" Version="4.1.1" />
     <PackageReference Include="Serilog.Sinks.Loki" Version="4.0.0-beta3" />
-    <PackageReference Include="Microsoft.Extensions.Primitives" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Primitives" Version="5.0.0" />
     <PackageReference Include="prometheus-net.DotNetRuntime" Version="4.2.2" />
   </ItemGroup>
   <ItemGroup>

Robust.Server/ServerIoC.cs

@@ -50,6 +50,7 @@ namespace Robust.Server
             IoCManager.Register<IMapManagerInternal, NetworkedMapManager>();
             IoCManager.Register<INetworkedMapManager, NetworkedMapManager>();
             IoCManager.Register<IEntityManager, ServerEntityManager>();
+            IoCManager.Register<IEntityLookup, EntityLookup>();
             IoCManager.Register<IEntityNetworkManager, ServerEntityManager>();
             IoCManager.Register<IServerEntityNetworkManager, ServerEntityManager>();
             IoCManager.Register<IMapLoader, MapLoader>();

Robust.Shared.Maths/Box2i.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -135,17 +135,5 @@ namespace Robust.Shared.Maths
         {
             return $"({Left}, {Bottom}, {Right}, {Top})";
         }
-
-        /// <summary>
-        /// Multiplies each side of the box by the scalar.
-        /// </summary>
-        public Box2i Scale(int scalar)
-        {
-            return new Box2i(
-                Left * scalar,
-                Bottom * scalar,
-                Right * scalar,
-                Top * scalar);
-        }
     }
 }

Robust.Shared.Maths/Robust.Shared.Maths.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <Import Project="..\MSBuild\Robust.DefineConstants.targets" />
   <ItemGroup>
-    <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="All" />
+    <PackageReference Include="JetBrains.Annotations" Version="2020.3.0" PrivateAssets="All" />
     <PackageReference Condition="'$(TargetFramework)' == 'net472'" Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.2" />
   </ItemGroup>
 </Project>

Robust.Shared.Maths/Vector2.cs

@@ -130,12 +130,6 @@ namespace Robust.Shared.Maths
             return new((int) MathF.Floor(X), (int) MathF.Floor(Y));
         }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public readonly Vector2i Ceiled()
-        {
-            return new((int) MathF.Ceiling(X), (int) MathF.Ceiling(Y));
-        }
-
         /// <summary>
         ///     Subtracts a vector from another, returning a new vector.
         /// </summary>

Robust.Shared.Scripting/Robust.Shared.Scripting.csproj

@@ -10,10 +10,10 @@
   <Import Project="..\MSBuild\Robust.DefineConstants.targets" />
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1" />
-    <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="3.8.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="3.8.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.8.0" />
+    <PackageReference Include="JetBrains.Annotations" Version="2020.3.0" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

Robust.Shared/CVars.cs

@@ -128,13 +128,13 @@ namespace Robust.Shared
         /// The amount of new entities that can be sent to a client in a single game state, under PVS.
         /// </summary>
         public static readonly CVarDef<int> NetPVSNewEntityBudget =
-            CVarDef.Create("net.pvs_new_budget", 20, CVar.ARCHIVE | CVar.REPLICATED);
+            CVarDef.Create("net.pvs_new_budget", 20, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
         /// <summary>
-        /// The amount of entered entities that can be sent to a client in a single game state, under PVS.
+        /// The amount of entity updates that can be sent to a client in a single game state, under PVS.
         /// </summary>
         public static readonly CVarDef<int> NetPVSEntityBudget =
-            CVarDef.Create("net.pvs_budget", 50, CVar.ARCHIVE | CVar.REPLICATED);
+            CVarDef.Create("net.pvs_budget", 50, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
         /// <summary>
         /// Log late input messages from clients.
@@ -1006,17 +1006,6 @@ namespace Robust.Shared
         public static readonly CVarDef<bool> ResTexturePreloadCache =
             CVarDef.Create("res.texture_preload_cache", true, CVar.CLIENTONLY);
 
-        /// <summary>
-        /// Override seekability of resource streams returned by ResourceManager.
-        /// See <see cref="ContentPack.StreamSeekMode"/> for int values.
-        /// </summary>
-        /// <remarks>
-        /// This is intended to be a debugging tool primarily.
-        /// Non-default seek modes WILL result in worse performance.
-        /// </remarks>
-        public static readonly CVarDef<int> ResStreamSeekMode =
-            CVarDef.Create("res.stream_seek_mode", (int)ContentPack.StreamSeekMode.None);
-
         /*
          * DEBUG
          */

Robust.Shared/Configuration/NetConfigurationManager.cs

@@ -20,16 +20,6 @@ namespace Robust.Shared.Configuration
         /// </summary>
         void SetupNetworking();
 
-        /// <summary>
-        /// Get a replicated client CVar for a specific client.
-        /// </summary>
-        /// <typeparam name="T">CVar type.</typeparam>
-        /// <param name="channel">channel of the connected client.</param>
-        /// <param name="definition">The CVar.</param>
-        /// <returns>Replicated CVar of the client.</returns>
-        public T GetClientCVar<T>(INetChannel channel, CVarDef<T> definition) where T : notnull =>
-            GetClientCVar<T>(channel, definition.Name);
-
         /// <summary>
         /// Get a replicated client CVar for a specific client.
         /// </summary>

Robust.Shared/Console/CommandBuffer.cs

@@ -1,81 +0,0 @@
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-
-namespace Robust.Shared.Console;
-
-public sealed class CommandBuffer
-{
-    private const string DelayMarker = "-DELAY-";
-
-    private int _tickrate = 0;
-    private int _delay = 0;
-
-    private readonly LinkedList<string> _commandBuffer = new();
-
-    public void Append(string command)
-    {
-        _commandBuffer.AddLast(command);
-    }
-
-    public void Insert(string command)
-    {
-        _commandBuffer.AddFirst(command);
-    }
-
-    public void Tick(byte tickRate)
-    {
-        _tickrate = tickRate;
-
-        if (_delay > 0)
-        {
-            _delay -= 1;
-        }
-    }
-
-    public bool TryGetCommand([MaybeNullWhen(false)]out string command)
-    {
-        var next = _commandBuffer.First;
-
-        if (next is null) // nothing to do here
-        {
-            command = null;
-            return false;
-        }
-
-        if (next.Value.Equals(DelayMarker))
-        {
-            if (_delay == 0) // just finished
-            {
-                _commandBuffer.RemoveFirst();
-                return TryGetCommand(out command);
-            }
-            else // currently counting down delay
-            {
-                command = null;
-                return false;
-            }
-        }
-
-        if (next.Value.StartsWith("wait "))
-        {
-            var sTicks = next.Value.Substring(5);
-            _commandBuffer.RemoveFirst();
-            if (string.IsNullOrWhiteSpace(sTicks) || !int.TryParse(sTicks, out var ticks)) // messed up command
-            {
-                return TryGetCommand(out command);
-            }
-
-            // Setup Timing
-            _commandBuffer.AddFirst(DelayMarker);
-            _delay = ticks;
-
-            command = null;
-            return false;
-        }
-
-        // normal command
-        _commandBuffer.RemoveFirst();
-        command = next.Value;
-        return true;
-    }
-}

Robust.Shared/Console/Commands/ExecCommand.cs

@@ -48,7 +48,7 @@ namespace Robust.Shared.Console.Commands
                     continue;
                 }
 
-                shell.ConsoleHost.AppendCommand(line);
+                shell.ExecuteCommand(line);
             }
         }
     }

Robust.Shared/Console/ConsoleHost.cs

@@ -7,7 +7,6 @@ using Robust.Shared.Log;
 using Robust.Shared.Network;
 using Robust.Shared.Players;
 using Robust.Shared.Reflection;
-using Robust.Shared.Timing;
 using Robust.Shared.ViewVariables;
 
 namespace Robust.Shared.Console
@@ -18,16 +17,13 @@ namespace Robust.Shared.Console
         protected const string SawmillName = "con";
 
         [Dependency] protected readonly ILogManager LogManager = default!;
-        [Dependency] private readonly IReflectionManager ReflectionManager = default!;
+        [Dependency] protected readonly IReflectionManager ReflectionManager = default!;
         [Dependency] protected readonly INetManager NetManager = default!;
         [Dependency] private readonly IDynamicTypeFactoryInternal _typeFactory = default!;
-        [Dependency] private readonly IGameTiming _timing = default!;
 
         [ViewVariables]
         protected readonly Dictionary<string, IConsoleCommand> AvailableCommands = new();
 
-        private readonly CommandBuffer _commandBuffer = new CommandBuffer();
-
         /// <inheritdoc />
         public bool IsServer => NetManager.IsServer;
 
@@ -120,36 +116,6 @@ namespace Robust.Shared.Console
             ExecuteCommand(null, command);
         }
 
-        /// <inheritdoc />
-        public void AppendCommand(string command)
-        {
-            _commandBuffer.Append(command);
-        }
-
-        /// <inheritdoc />
-        public void InsertCommand(string command)
-        {
-            _commandBuffer.Insert(command);
-        }
-
-        /// <inheritdoc />
-        public void CommandBufferExecute()
-        {
-            _commandBuffer.Tick(_timing.TickRate);
-
-            while (_commandBuffer.TryGetCommand(out var cmd))
-            {
-                try
-                {
-                    ExecuteCommand(cmd);
-                }
-                catch (Exception e)
-                {
-                    LocalShell.WriteError(e.Message);
-                }
-            }
-        }
-
         /// <summary>
         /// A console command that was registered inline through <see cref="IConsoleHost"/>.
         /// </summary>

Robust.Shared/Console/IConsoleHost.cs

@@ -81,35 +81,11 @@ namespace Robust.Shared.Console
         IConsoleShell GetSessionShell(ICommonSession session);
 
         /// <summary>
-        /// Execute a command string immediately on the local shell, bypassing the command buffer completely.
+        /// Execute a command string on the local shell.
         /// </summary>
         /// <param name="command">Command string to execute.</param>
         void ExecuteCommand(string command);
 
-        /// <summary>
-        /// Appends a command into the end of the command buffer on the local shell.
-        /// </summary>
-        /// <remarks>
-        ///  This command will be ran *sometime* in the future, depending on how many waits are in the buffer.
-        /// </remarks>
-        /// <param name="command">Command string to execute.</param>
-        void AppendCommand(string command);
-
-        /// <summary>
-        /// Inserts a command into the front of the command buffer on the local shell.
-        /// </summary>
-        /// <remarks>
-        ///  This command will preempt the next command executed in the command buffer.
-        /// </remarks>
-        /// <param name="command">Command string to execute.</param>
-        void InsertCommand(string command);
-
-        /// <summary>
-        /// Processes any contents of the command buffer on the local shell. This needs to be called regularly (once a tick),
-        /// inside the simulation. Pausing the server should prevent the buffer from being processed.
-        /// </summary>
-        void CommandBufferExecute();
-
         /// <summary>
         /// Executes a command string on this specific session shell. If the command does not exist, the command will be forwarded
         /// to the

Robust.Shared/Containers/BaseContainer.cs

@@ -81,7 +81,6 @@ namespace Robust.Shared.Containers
             // spatially move the object to the location of the container. If you don't want this functionality, the
             // calling code can save the local position before calling this function, and apply it afterwords.
             transform.LocalPosition = Vector2.Zero;
-            transform.LocalRotation = Angle.Zero;
 
             return true;
         }

Robust.Shared/Containers/SharedContainerSystem.cs

@@ -209,43 +209,6 @@ namespace Robust.Shared.Containers
             return false;
         }
 
-        /// <summary>
-        /// Gets the top-most container in the hierarchy for this entity, if it exists.
-        /// </summary>
-        public bool TryGetOuterContainer(EntityUid uid, TransformComponent xform, [NotNullWhen(true)] out IContainer? container)
-        {
-            var xformQuery = EntityManager.GetEntityQuery<TransformComponent>();
-            return TryGetOuterContainer(uid, xform, out container, xformQuery);
-        }
-
-        public bool TryGetOuterContainer(EntityUid uid, TransformComponent xform,
-            [NotNullWhen(true)] out IContainer? container, EntityQuery<TransformComponent> xformQuery)
-        {
-            container = null;
-
-            if (!uid.IsValid())
-                return false;
-
-            var conQuery = EntityManager.GetEntityQuery<ContainerManagerComponent>();
-            var child = uid;
-            var parent = xform.ParentUid;
-
-            while (parent.IsValid())
-            {
-                if (conQuery.TryGetComponent(parent, out var conManager) &&
-                    conManager.TryGetContainer(child, out var parentContainer))
-                {
-                    container = parentContainer;
-                }
-
-                var parentXform = xformQuery.GetComponent(parent);
-                child = parent;
-                parent = parentXform.ParentUid;
-            }
-
-            return container != null;
-        }
-
         #endregion
 
         // Eject entities from their parent container if the parent change is done by the transform only.

Robust.Shared/ContentPack/AssemblyTypeChecker.cs

@@ -111,7 +111,7 @@ namespace Robust.Shared.ContentPack
             var fullStopwatch = Stopwatch.StartNew();
 
             var resolver = CreateResolver();
-            using var peReader = ModLoader.MakePEReader(assembly, leaveOpen: true);
+            using var peReader = new PEReader(assembly, PEStreamOptions.LeaveOpen);
             var reader = peReader.GetMetadataReader();
 
             var asmName = reader.GetString(reader.GetAssemblyDefinition().Name);
@@ -853,13 +853,13 @@ namespace Robust.Shared.ContentPack
                         continue;
                     }
 
-                    return ModLoader.MakePEReader(File.OpenRead(path));
+                    return ReaderFromStream(File.OpenRead(path));
                 }
 
                 var extraStream = _parent.ExtraRobustLoader?.Invoke(dllName);
                 if (extraStream != null)
                 {
-                    return ModLoader.MakePEReader(extraStream);
+                    return ReaderFromStream(extraStream);
                 }
 
                 foreach (var resLoadPath in _resLoadPaths)
@@ -867,7 +867,7 @@ namespace Robust.Shared.ContentPack
                     try
                     {
                         var path = resLoadPath / dllName;
-                        return ModLoader.MakePEReader(_parent._res.ContentFileRead(path));
+                        return ReaderFromStream(_parent._res.ContentFileRead(path));
                     }
                     catch (FileNotFoundException)
                     {
@@ -877,6 +877,23 @@ namespace Robust.Shared.ContentPack
                 return null;
             }
 
+            private static PEReader ReaderFromStream(Stream stream)
+            {
+                if (OperatingSystem.IsLinux() && stream is FileStream)
+                {
+                    // PEReader is bugged on Linux and not properly thread safe when doing memory mapping.
+                    // As such, we never pass it a file stream so it uses a different, non-bugged code path.
+                    // See https://github.com/dotnet/runtime/issues/60545
+                    var ms = new MemoryStream();
+                    stream.CopyTo(ms);
+                    ms.Seek(0, SeekOrigin.Begin);
+                    stream.Dispose();
+                    stream = ms;
+                }
+
+                return new PEReader(stream);
+            }
+
             public PEReader? Resolve(string simpleName)
             {
                 return _dictionary.GetOrAdd(simpleName, ResolveCore);

Robust.Shared/ContentPack/MemoryContentRoot.cs

@@ -1,146 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using System.IO;
-using System.Threading;
-using Robust.Shared.Utility;
-
-namespace Robust.Shared.ContentPack;
-
-/// <summary>
-///     A content root stored in memory, backed by a dictionary.
-/// </summary>
-public sealed class MemoryContentRoot : IContentRoot, IDisposable
-{
-    private readonly Dictionary<ResourcePath, byte[]> _files = new();
-
-    private readonly ReaderWriterLockSlim _lock = new();
-
-    /// <summary>
-    ///     Adds a file to the content root, or updates it if that path already exists.
-    /// </summary>
-    /// <param name="relPath">The relative path of the file.</param>
-    /// <param name="data">The data byte array to store in the content root. Stored as is, without being copied or cloned.</param>
-    public void AddOrUpdateFile(ResourcePath relPath, byte[] data)
-    {
-        // Just in case, we ensure it's a clean relative path.
-        relPath = relPath.Clean().ToRelativePath();
-
-        _lock.EnterWriteLock();
-        try
-        {
-            _files[relPath] = data;
-        }
-        finally
-        {
-            _lock.ExitWriteLock();
-        }
-    }
-
-    /// <summary>
-    ///     Remove a file from this content root.
-    /// </summary>
-    /// <param name="relPath">The relative path to the file.</param>
-    /// <returns></returns>
-    public bool RemoveFile(ResourcePath relPath)
-    {
-        _lock.EnterWriteLock();
-        try
-        {
-            return _files.Remove(relPath);
-        }
-        finally
-        {
-            _lock.ExitWriteLock();
-        }
-    }
-
-    /// <inheritdoc />
-    public bool TryGetFile(ResourcePath relPath, [NotNullWhen(true)] out Stream? stream)
-    {
-        _lock.EnterReadLock();
-        try
-        {
-            if (!_files.TryGetValue(relPath, out var data))
-            {
-                stream = null;
-                return false;
-            }
-
-            // Non-writable stream, as this needs to be thread-safe.
-            stream = new MemoryStream(data, false);
-            return true;
-        }
-        finally
-        {
-            _lock.ExitReadLock();
-        }
-    }
-
-    /// <inheritdoc />
-    public IEnumerable<ResourcePath> FindFiles(ResourcePath path)
-    {
-        _lock.EnterReadLock();
-        try
-        {
-            foreach (var (file, _) in _files)
-            {
-                if (file.TryRelativeTo(path, out _))
-                    yield return file;
-            }
-        }
-        finally
-        {
-            _lock.ExitReadLock();
-        }
-    }
-
-    /// <inheritdoc />
-    public IEnumerable<string> GetRelativeFilePaths()
-    {
-        _lock.EnterReadLock();
-        try
-        {
-            foreach (var (file, _) in _files)
-            {
-                yield return file.ToString();
-            }
-        }
-        finally
-        {
-            _lock.ExitReadLock();
-        }
-    }
-
-    /// <summary>
-    ///     Enumerates all files and their resource paths on this content root.
-    /// </summary>
-    /// <remarks>Do not modify or keep around the returned byte array, it's meant to be read-only.</remarks>
-    public IEnumerable<(ResourcePath relPath, byte[] data)> GetAllFiles()
-    {
-        _lock.EnterReadLock();
-        try
-        {
-            foreach (var (p, d) in _files)
-            {
-                yield return (p, d);
-            }
-        }
-        finally
-        {
-            _lock.ExitReadLock();
-        }
-    }
-
-    /// <inheritdoc />
-    public void Mount()
-    {
-        // Nada. We don't need to perform any special logic here.
-    }
-
-    /// <inheritdoc />
-    public void Dispose()
-    {
-        _lock.Dispose();
-    }
-}

Robust.Shared/ContentPack/ModLoader.cs

@@ -160,7 +160,7 @@ namespace Robust.Shared.ContentPack
 
         private static (string[] refs, string name) GetAssemblyReferenceData(Stream stream)
         {
-            using var reader = ModLoader.MakePEReader(stream);
+            using var reader = new PEReader(stream);
             var metaReader = reader.GetMetadataReader();
 
             var name = metaReader.GetString(metaReader.GetAssemblyDefinition().Name);
@@ -383,13 +383,5 @@ namespace Robust.Shared.ContentPack
                 EngineModuleDirectories = _engineModuleDirectories.ToArray()
             };
         }
-
-        internal static PEReader MakePEReader(Stream stream, bool leaveOpen=false)
-        {
-            if (!stream.CanSeek)
-                stream = leaveOpen ? stream.CopyToMemoryStream() : stream.ConsumeToMemoryStream();
-
-            return new PEReader(stream, leaveOpen ? PEStreamOptions.LeaveOpen : default);
-        }
     }
 }

Robust.Shared/ContentPack/NonSeekableStream.cs

@@ -1,95 +0,0 @@
-using System;
-using System.IO;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace Robust.Shared.ContentPack;
-
-internal sealed class NonSeekableStream : Stream
-{
-    private readonly Stream _baseStream;
-
-    public NonSeekableStream(Stream baseStream)
-    {
-        _baseStream = baseStream;
-    }
-
-    protected override void Dispose(bool disposing)
-    {
-        if (disposing)
-            _baseStream.Dispose();
-    }
-
-    public override ValueTask DisposeAsync()
-    {
-        return _baseStream.DisposeAsync();
-    }
-
-    public override void Flush()
-    {
-        _baseStream.Flush();
-    }
-
-    public override int Read(byte[] buffer, int offset, int count)
-    {
-        return _baseStream.Read(buffer, offset, count);
-    }
-
-    public override int Read(Span<byte> buffer)
-    {
-        return _baseStream.Read(buffer);
-    }
-
-    public override int ReadByte()
-    {
-        return _baseStream.ReadByte();
-    }
-
-    public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = new CancellationToken())
-    {
-        return _baseStream.ReadAsync(buffer, cancellationToken);
-    }
-
-    public override long Seek(long offset, SeekOrigin origin)
-    {
-        throw new NotSupportedException();
-    }
-
-    public override void SetLength(long value)
-    {
-        throw new NotSupportedException();
-    }
-
-    public override void Write(byte[] buffer, int offset, int count)
-    {
-        _baseStream.Write(buffer, offset, count);
-    }
-
-    public override void Write(ReadOnlySpan<byte> buffer)
-    {
-        _baseStream.Write(buffer);
-    }
-
-    public override void WriteByte(byte value)
-    {
-        _baseStream.WriteByte(value);
-    }
-
-    public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = new CancellationToken())
-    {
-        return _baseStream.WriteAsync(buffer, cancellationToken);
-    }
-
-    public override bool CanRead => _baseStream.CanRead;
-    public override bool CanSeek => false;
-    public override bool CanWrite => _baseStream.CanWrite;
-    // .NET mingles seekability and exposing length.
-    // This makes absolutely no sense but ok.
-    public override long Length => throw new NotSupportedException();
-
-    public override long Position
-    {
-        get => throw new NotSupportedException();
-        set => throw new NotSupportedException();
-    }
-}

Robust.Shared/ContentPack/ResourceManager.cs

@@ -23,8 +23,6 @@ namespace Robust.Shared.ContentPack
         private readonly List<(ResourcePath prefix, IContentRoot root)> _contentRoots =
             new();
 
-        private StreamSeekMode _streamSeekMode;
-
         // Special file names on Windows like serial ports.
         private static readonly Regex BadPathSegmentRegex =
             new("^(CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9])$", RegexOptions.IgnoreCase);
@@ -47,8 +45,6 @@ namespace Robust.Shared.ContentPack
             {
                 UserData = new VirtualWritableDirProvider();
             }
-
-            _config.OnValueChanged(CVars.ResStreamSeekMode, i => _streamSeekMode = (StreamSeekMode)i, true);
         }
 
         /// <inheritdoc />
@@ -195,9 +191,8 @@ namespace Robust.Shared.ContentPack
                         continue;
                     }
 
-                    if (root.TryGetFile(relative, out var stream))
+                    if (root.TryGetFile(relative, out fileStream))
                     {
-                        fileStream = WrapStream(stream);
                         return true;
                     }
                 }
@@ -211,35 +206,6 @@ namespace Robust.Shared.ContentPack
             }
         }
 
-        /// <summary>
-        /// Apply <see cref="_streamSeekMode"/> to the provided stream.
-        /// </summary>
-        private Stream WrapStream(Stream stream)
-        {
-            switch (_streamSeekMode)
-            {
-                case StreamSeekMode.None:
-                    return stream;
-
-                case StreamSeekMode.ForceSeekable:
-                    if (stream.CanSeek)
-                        return stream;
-
-                    var ms = new MemoryStream(stream.CopyToArray(), writable: false);
-                    stream.Dispose();
-                    return ms;
-
-                case StreamSeekMode.ForceNonSeekable:
-                    if (!stream.CanSeek)
-                        return stream;
-
-                    return new NonSeekableStream(stream);
-
-                default:
-                    throw new InvalidOperationException();
-            }
-        }
-
         /// <inheritdoc />
         public bool ContentFileExists(string path)
         {

Robust.Shared/ContentPack/Sandbox.yml

@@ -689,7 +689,6 @@ Types:
     CancellationToken: { All: True }
     CancellationTokenSource: { All: True }
     Interlocked: { All: True }
-    Monitor: { All: True }
   System.Web:
     HttpUtility:
       Methods: