Don't ServerSendToAll to channels without completed handshake.

Can do ordered session event subscription.

Can subscribe to "All" in one call, to reduce shared boilerplate.

.github/workflows/test-content.yml

@@ -38,4 +38,4 @@ jobs:
     - name: Content.Tests
       run: dotnet test --no-build Content.Tests/Content.Tests.csproj -v n
     - name: Content.IntegrationTests
-      run: dotnet test --no-build Content.IntegrationTests/Content.IntegrationTests.csproj -v n
+      run: COMPlus_gcServer=1 dotnet test --no-build Content.IntegrationTests/Content.IntegrationTests.csproj -v n

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "ManagedHttpListener"]
 	path = ManagedHttpListener
 	url = https://github.com/space-wizards/ManagedHttpListener.git
+[submodule "Linguini"]
+	path = Linguini
+	url = https://github.com/space-wizards/Linguini

OpenToolkit.GraphicsLibraryFramework/GLFWNative.cs

@@ -23,12 +23,12 @@ namespace OpenToolkit.GraphicsLibraryFramework
                     return IntPtr.Zero;
                 }
 
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                if (OperatingSystem.IsLinux())
                 {
                     return NativeLibrary.Load("libglfw.so.3", assembly, path);
                 }
 
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+                if (OperatingSystem.IsMacOS())
                 {
                     return NativeLibrary.Load("libglfw.3.dylib", assembly, path);
                 }

Resources/EngineCredits/Libraries.yml

@@ -23,6 +23,48 @@
     OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+- name: Box2D
+  license:
+    MIT License
+
+    Copyright (c) 2019 Erin Catto
+
+    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.
+
+- name: Bullet Physics SDK
+  license:
+    The files in this repository are licensed under the zlib license, except for the files under 'Extras' and examples/ThirdPartyLibs.
+
+    Bullet Continuous Collision Detection and Physics Library
+    http://bulletphysics.org
+
+    This software is provided 'as-is', without any express or implied warranty.
+    In no event will the authors be held liable for any damages arising from the use of this software.
+    Permission is granted to anyone to use this software for any purpose,
+    including commercial applications, and to alter it and redistribute it freely,
+    subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. 
+    If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+    2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+    3. This notice may not be removed or altered from any source distribution. 
+
 - name: Castle Core
   license: |
     Copyright 2004-2016 Castle Project - http://www.castleproject.org/
@@ -317,6 +359,43 @@
     See the License for the specific language governing permissions and
     limitations under the License.
 
+- name: Farseer Physics Engine
+  license:
+    Microsoft Permissive License (Ms-PL)
+
+    This license governs use of the accompanying software.
+    If you use the software, you accept this license.
+    If you do not accept the license, do not use the software.
+
+    1. Definitions
+    The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under U.S. copyright law.
+    A "contribution" is the original software, or any additions or changes to the software.
+    A "contributor" is any person that distributes its contribution under this license.
+    "Licensed patents" are a contributor's patent claims that read directly on its contribution.
+
+    2. Grant of Rights
+    (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, 
+    each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, 
+    prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
+    (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, 
+    each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to 
+    make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or 
+    derivative works of the contribution in the software.
+
+    3. Conditions and Limitations
+    (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
+    (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, 
+    your patent license from such contributor to the software ends automatically.
+    (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, 
+    and attribution notices that are present in the software.
+    (D) If you distribute any portion of the software in source code form, you may do so only under this license by 
+    including a complete copy of this license with your distribution. If you distribute any portion of the software in 
+    compiled or object code form, you may only do so under a license that complies with this license.
+    (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, 
+    guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot change. 
+    To the extent permitted under your local laws, the contributors exclude the implied warranties of 
+    merchantability, fitness for a particular purpose and non-infringement.
+
 - name: Mono.Cecil
   license: |
     Copyright (c) 2008 - 2015 Jb Evain

Resources/Locale/en-US/console.ftl

@@ -1 +0,0 @@
-console-line-edit-placeholder = Command Here

Resources/Locale/en-US/custom-controls.ftl

@@ -0,0 +1,11 @@
+## EntitySpawnWindow
+
+entity-spawn-window-title = Entity Spawn Panel
+entity-spawn-window-search-bar-placeholder = search
+entity-spawn-window-clear-button = Clear
+entity-spawn-window-erase-button-text = Erase Mode
+entity-spawn-window-override-menu-tooltip = Override placement
+
+## Console
+
+console-line-edit-placeholder = Command Here

Resources/Locale/en-US/tab-container.ftl

@@ -0,0 +1 @@
+tab-container-not-tab-title-provided = No title

Resources/Locale/en-US/view-variables.ftl

@@ -0,0 +1,11 @@
+## ViewVariablesInstanceEntity
+
+view-variable-instance-entity-server-components-add-component-button-placeholder = Add Component
+view-variable-instance-entity-client-variables-tab-title = Client Variables
+view-variable-instance-entity-client-components-tab-title = Client Components
+view-variable-instance-entity-server-variables-tab-title = Server Variables
+view-variable-instance-entity-server-components-tab-title = Server Components
+view-variable-instance-entity-client-components-search-bar-placeholder = Search
+view-variable-instance-entity-server-components-search-bar-placeholder = Search
+view-variable-instance-entity-add-window-server-components = Add Component [S]
+view-variable-instance-entity-add-window-client-components = Add Component [C]

Robust.Benchmarks/Serialization/Copy/SerializationCopyBenchmark.cs

@@ -1,44 +1,21 @@
-using System;
-using System.IO;
+using System.IO;
 using System.Linq;
 using BenchmarkDotNet.Attributes;
 using Robust.Benchmarks.Serialization.Definitions;
-using Robust.Server;
-using Robust.Shared.Configuration;
-using Robust.Shared.ContentPack;
-using Robust.Shared.IoC;
-using Robust.Shared.Reflection;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Serialization.Markdown.Mapping;
+using Robust.Shared.Serialization.Markdown.Sequence;
 using Robust.Shared.Utility;
 using YamlDotNet.RepresentationModel;
 
 namespace Robust.Benchmarks.Serialization.Copy
 {
-    public class SerializationCopyBenchmark
+    public class SerializationCopyBenchmark : SerializationBenchmark
     {
         public SerializationCopyBenchmark()
         {
-            IoCManager.InitThread();
-            ServerIoC.RegisterIoC();
-            IoCManager.BuildGraph();
-
-            var assemblies = new[]
-            {
-                AppDomain.CurrentDomain.GetAssemblyByName("Robust.Shared"),
-                AppDomain.CurrentDomain.GetAssemblyByName("Robust.Server"),
-                AppDomain.CurrentDomain.GetAssemblyByName("Robust.Benchmarks")
-            };
-
-            foreach (var assembly in assemblies)
-            {
-                IoCManager.Resolve<IConfigurationManagerInternal>().LoadCVarsFromAssembly(assembly);
-            }
-
-            IoCManager.Resolve<IReflectionManager>().LoadAssemblies(assemblies);
-
-            SerializationManager = IoCManager.Resolve<ISerializationManager>();
-            SerializationManager.Initialize();
+            InitializeSerialization();
 
             DataDefinitionWithString = new DataDefinitionWithString {StringField = "ABC"};
 
@@ -50,8 +27,6 @@ namespace Robust.Benchmarks.Serialization.Copy
             Seed = SerializationManager.ReadValueOrThrow<SeedDataDefinition>(seedMapping);
         }
 
-        private ISerializationManager SerializationManager { get; }
-
         private const string String = "ABC";
 
         private const int Integer = 1;

Robust.Benchmarks/Serialization/Definitions/SeedDataDefinition.cs

@@ -6,6 +6,10 @@ using Robust.Shared.Utility;
 
 namespace Robust.Benchmarks.Serialization.Definitions
 {
+    /// <summary>
+    ///     Arbitrarily large data definition for benchmarks.
+    ///     Taken from content.
+    /// </summary>
     [Prototype("seed")]
     public class SeedDataDefinition : IPrototype
     {
@@ -96,13 +100,15 @@ namespace Robust.Benchmarks.Serialization.Definitions
         Repeat
     }
 
-    public enum Gas {}
+    public enum Gas
+    {
+    }
 
     [DataDefinition]
     public struct SeedChemQuantity
     {
         [DataField("Min")]
-        public int Min { get; }
+        public int Min;
 
         [DataField("Max")]
         public int Max;

Robust.Benchmarks/Serialization/Read/SerializationReadBenchmark.cs

@@ -2,6 +2,9 @@
 using BenchmarkDotNet.Attributes;
 using Robust.Benchmarks.Serialization.Definitions;
 using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Serialization.Markdown.Mapping;
+using Robust.Shared.Serialization.Markdown.Sequence;
+using Robust.Shared.Serialization.Markdown.Value;
 using YamlDotNet.RepresentationModel;
 
 namespace Robust.Benchmarks.Serialization.Read
@@ -13,7 +16,7 @@ namespace Robust.Benchmarks.Serialization.Read
             InitializeSerialization();
 
             StringDataDefNode = new MappingDataNode();
-            StringDataDefNode.AddNode(new ValueDataNode("string"), new ValueDataNode("ABC"));
+            StringDataDefNode.Add(new ValueDataNode("string"), new ValueDataNode("ABC"));
 
             var yamlStream = new YamlStream();
             yamlStream.Load(new StringReader(SeedDataDefinition.Prototype));

Robust.Benchmarks/Serialization/Write/SerializationWriteBenchmark.cs

@@ -0,0 +1,98 @@
+using System.Globalization;
+using System.IO;
+using BenchmarkDotNet.Attributes;
+using Robust.Benchmarks.Serialization.Definitions;
+using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Serialization.Markdown.Mapping;
+using Robust.Shared.Serialization.Markdown.Sequence;
+using Robust.Shared.Serialization.Markdown.Value;
+using YamlDotNet.RepresentationModel;
+
+namespace Robust.Benchmarks.Serialization.Write
+{
+    public class SerializationWriteBenchmark : SerializationBenchmark
+    {
+        public SerializationWriteBenchmark()
+        {
+            InitializeSerialization();
+
+            DataDefinitionWithString = new DataDefinitionWithString {StringField = "ABC"};
+
+            var yamlStream = new YamlStream();
+            yamlStream.Load(new StringReader(SeedDataDefinition.Prototype));
+
+            var seedMapping = yamlStream.Documents[0].RootNode.ToDataNodeCast<SequenceDataNode>().Cast<MappingDataNode>(0);
+
+            Seed = SerializationManager.ReadValueOrThrow<SeedDataDefinition>(seedMapping);
+        }
+
+        private const string String = "ABC";
+
+        private const int Integer = 1;
+
+        private DataDefinitionWithString DataDefinitionWithString { get; }
+
+        private SeedDataDefinition Seed { get; }
+
+        [Benchmark]
+        public DataNode WriteString()
+        {
+            return SerializationManager.WriteValue(String);
+        }
+
+        [Benchmark]
+        public DataNode WriteInteger()
+        {
+            return SerializationManager.WriteValue(Integer);
+        }
+
+        [Benchmark]
+        public DataNode WriteDataDefinitionWithString()
+        {
+            return SerializationManager.WriteValue(DataDefinitionWithString);
+        }
+
+        [Benchmark]
+        public DataNode WriteSeedDataDefinition()
+        {
+            return SerializationManager.WriteValue(Seed);
+        }
+
+        [Benchmark]
+        public DataNode BaselineWriteSeedDataDefinition()
+        {
+            var mapping = new MappingDataNode();
+
+            mapping.Add("id", Seed.ID);
+            mapping.Add("name", Seed.Name);
+            mapping.Add("seedName", Seed.SeedName);
+            mapping.Add("displayName", Seed.DisplayName);
+            mapping.Add("productPrototypes", Seed.ProductPrototypes);
+            mapping.Add("harvestRepeat", Seed.HarvestRepeat.ToString());
+            mapping.Add("lifespan", Seed.Lifespan.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("maturation", Seed.Maturation.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("production", Seed.Production.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("yield", Seed.Yield.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("potency", Seed.Potency.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("growthStages", Seed.GrowthStages.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("idealLight", Seed.IdealLight.ToString(CultureInfo.InvariantCulture));
+            mapping.Add("idealHeat", Seed.IdealHeat.ToString(CultureInfo.InvariantCulture));
+
+            var chemicals = new MappingDataNode();
+            foreach (var (name, quantity) in Seed.Chemicals)
+            {
+                chemicals.Add(name, new MappingDataNode
+                {
+                    ["Min"] = new ValueDataNode(quantity.Min.ToString(CultureInfo.InvariantCulture)),
+                    ["Max"] = new ValueDataNode(quantity.Max.ToString(CultureInfo.InvariantCulture)),
+                    ["PotencyDivisor"] = new ValueDataNode(quantity.PotencyDivisor.ToString(CultureInfo.InvariantCulture))
+                });
+            }
+
+            mapping.Add("chemicals", chemicals);
+
+            return mapping;
+        }
+    }
+}

Robust.Client.NameGenerator/XamlUiPartialClassGenerator.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text;
 using Microsoft.CodeAnalysis;
@@ -147,9 +148,10 @@ namespace {nameSpace}
             foreach (var typeSymbol in symbols)
             {
                 var xamlFileName = $"{typeSymbol.Name}.xaml";
-                var relevantXamlFile = context.AdditionalFiles.FirstOrDefault(t => t.Path.EndsWith(xamlFileName));
+                var xamlFileNameSep = $"{Path.DirectorySeparatorChar}{xamlFileName}";
+                var relevantXamlFiles = context.AdditionalFiles.Where(t => t.Path.EndsWith(xamlFileNameSep)).ToArray();
 
-                if (relevantXamlFile == null)
+                if (relevantXamlFiles.Length == 0)
                 {
                     context.ReportDiagnostic(
                         Diagnostic.Create(
@@ -165,13 +167,28 @@ namespace {nameSpace}
                     continue;
                 }
 
-                var txt = relevantXamlFile.GetText()?.ToString();
-                if (txt == null)
+                if (relevantXamlFiles.Length > 1)
                 {
                     context.ReportDiagnostic(
                         Diagnostic.Create(
                             new DiagnosticDescriptor(
                                 "RXN0002",
+                                $"Found multiple candidate XAML files for {typeSymbol}",
+                                $"Multiple files exist with name {xamlFileName}",
+                                "Usage",
+                                DiagnosticSeverity.Error,
+                                true),
+                            typeSymbol.Locations[0]));
+                    continue;
+                }
+
+                var txt = relevantXamlFiles[0].GetText()?.ToString();
+                if (txt == null)
+                {
+                    context.ReportDiagnostic(
+                        Diagnostic.Create(
+                            new DiagnosticDescriptor(
+                                "RXN0004",
                                 $"Unexpected empty Xaml-File was found at {xamlFileName}",
                                 "Expected Content due to a Class with the same name being annotated with [GenerateTypedNameReferences].",
                                 "Usage",
@@ -192,7 +209,7 @@ namespace {nameSpace}
                     context.ReportDiagnostic(
                         Diagnostic.Create(
                             new DiagnosticDescriptor(
-                                "AXN0003",
+                                "RXN0003",
                                 "Unhandled exception occured while generating typed Name references.",
                                 $"Unhandled exception occured while generating typed Name references: {e}",
                                 "Usage",
@@ -247,7 +264,6 @@ namespace {nameSpace}
                                 DiagnosticSeverity.Error,
                                 true),
                             Location.None));
-                    return null;
                 }
             }
 

Robust.Client/Audio/Midi/MidiManager.cs

@@ -6,14 +6,18 @@ using System.Threading;
 using NFluidsynth;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
+using Robust.Shared;
+using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Physics;
 using Robust.Shared.Physics.Broadphase;
 using Robust.Shared.Utility;
+using Robust.Shared.ViewVariables;
 using Logger = Robust.Shared.Log.Logger;
 
 namespace Robust.Client.Audio.Midi
@@ -32,24 +36,6 @@ namespace Robust.Client.Audio.Midi
         /// </returns>
         IMidiRenderer? GetNewRenderer();
 
-        /*
-        /// <summary>
-        ///     Checks whether the file at the given path is a valid midi file or not.
-        /// </summary>
-        /// <remarks>
-        ///     We add this here so content doesn't need to reference NFluidsynth.
-        /// </remarks>
-        bool IsMidiFile(string filename);
-
-        /// <summary>
-        ///     Checks whether the file at the given path is a valid midi file or not.
-        /// </summary>
-        /// <remarks>
-        ///     We add this here so content doesn't need to reference NFluidsynth.
-        /// </remarks>
-        bool IsSoundfontFile(string filename);
-        */
-
         /// <summary>
         ///     Method called every frame.
         ///     Should be used to update positional audio.
@@ -57,6 +43,11 @@ namespace Robust.Client.Audio.Midi
         /// <param name="frameTime"></param>
         void FrameUpdate(float frameTime);
 
+        /// <summary>
+        ///     Volume, in db.
+        /// </summary>
+        float Volume { get; set; }
+
         /// <summary>
         ///     If true, MIDI support is available.
         /// </summary>
@@ -72,9 +63,11 @@ namespace Robust.Client.Audio.Midi
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly IResourceManagerInternal _resourceManager = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;
+        [Dependency] private readonly IConfigurationManager _cfgMan = default!;
 
         private SharedBroadPhaseSystem _broadPhaseSystem = default!;
 
+        [ViewVariables]
         public bool IsAvailable
         {
             get
@@ -85,12 +78,29 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
-        private readonly List<MidiRenderer> _renderers = new();
+        [ViewVariables]
+        private readonly List<IMidiRenderer> _renderers = new();
 
         private bool _alive = true;
         private Settings? _settings;
         private Thread? _midiThread;
         private ISawmill _midiSawmill = default!;
+        private float _volume = 0f;
+        private bool _volumeDirty = true;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float Volume
+        {
+            get => _volume;
+            set
+            {
+                if (MathHelper.CloseTo(_volume, value))
+                    return;
+
+                _cfgMan.SetCVar(CVars.MidiVolume, value);
+                _volumeDirty = true;
+            }
+        }
 
         private static readonly string[] LinuxSoundfonts =
         {
@@ -117,12 +127,19 @@ namespace Robust.Client.Audio.Midi
         private NFluidsynth.Logger.LoggerDelegate _loggerDelegate = default!;
         private ISawmill _sawmill = default!;
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public int OcclusionCollisionMask { get; set; }
 
         private void InitializeFluidsynth()
         {
             if (FluidsynthInitialized || _failedInitialize) return;
 
+            _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
+            {
+                _volume = value;
+                _volumeDirty = true;
+            }, true);
+
             _midiSawmill = Logger.GetSawmill("midi");
             _sawmill = Logger.GetSawmill("midi.fluidsynth");
             _loggerDelegate = LoggerDelegate;
@@ -175,18 +192,6 @@ namespace Robust.Client.Audio.Midi
             _sawmill.Log(rLevel, message);
         }
 
-        /*
-        public bool IsMidiFile(string filename)
-        {
-            return SoundFont.IsMidiFile(filename);
-        }
-
-        public bool IsSoundfontFile(string filename)
-        {
-            return SoundFont.IsSoundFont(filename);
-        }
-        */
-
         public IMidiRenderer? GetNewRenderer()
         {
             if (!FluidsynthInitialized)
@@ -220,7 +225,7 @@ namespace Robust.Client.Audio.Midi
                 // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
                 renderer.LoadSoundfont(FallbackSoundfont);
 
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                if (OperatingSystem.IsLinux())
                 {
                     foreach (var filepath in LinuxSoundfonts)
                     {
@@ -238,19 +243,21 @@ namespace Robust.Client.Audio.Midi
                         break;
                     }
                 }
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+                else if (OperatingSystem.IsMacOS())
                 {
                     if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
                         renderer.LoadSoundfont(OsxSoundfont, true);
                 }
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                else if (OperatingSystem.IsWindows())
                 {
                     if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
                         renderer.LoadSoundfont(WindowsSoundfont, true);
                 }
 
                 lock (_renderers)
+                {
                     _renderers.Add(renderer);
+                }
 
                 return renderer;
             }
@@ -268,74 +275,79 @@ namespace Robust.Client.Audio.Midi
             }
 
             // Update positions of streams every frame.
-            lock (_renderers)
-                foreach (var renderer in _renderers)
+            foreach (var renderer in _renderers)
+            {
+                if (renderer.Disposed)
+                    continue;
+
+                if(_volumeDirty)
+                    renderer.Source.SetVolume(Volume);
+
+                if (!renderer.Mono)
                 {
-                    if (renderer.Disposed)
-                        continue;
-
-                    if (!renderer.Mono)
-                    {
-                        renderer.Source.SetGlobal();
-                        continue;
-                    }
-
-                    MapCoordinates? mapPos = null;
-                    if (renderer.TrackingCoordinates != null)
-                    {
-                        mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
-                    }
-                    else if (renderer.TrackingEntity != null)
-                    {
-                        mapPos = renderer.TrackingEntity.Transform.MapPosition;
-                    }
-
-                    if (mapPos != null)
-                    {
-                        var pos = mapPos.Value;
-                        if (pos.MapId != _eyeManager.CurrentMap)
-                        {
-                            renderer.Source.SetVolume(-10000000);
-                        }
-                        else
-                        {
-                            var sourceRelative = _eyeManager.CurrentEye.Position.Position - pos.Position;
-                            var occlusion = 0f;
-                            if (sourceRelative.Length > 0)
-                            {
-                                occlusion = _broadPhaseSystem.IntersectRayPenetration(
-                                    pos.MapId,
-                                    new CollisionRay(
-                                        pos.Position,
-                                        sourceRelative.Normalized,
-                                        OcclusionCollisionMask),
-                                    sourceRelative.Length,
-                                    renderer.TrackingEntity);
-                            }
-                            renderer.Source.SetOcclusion(occlusion);
-                        }
-
-                        if (renderer.Source.SetPosition(pos.Position))
-                        {
-                            continue;
-                        }
-
-                        if (renderer.TrackingEntity != null)
-                        {
-                            renderer.Source.SetVelocity(renderer.TrackingEntity.GlobalLinearVelocity());
-                        }
-
-                        if (float.IsNaN(pos.Position.X) || float.IsNaN(pos.Position.Y))
-                        {
-                            // just duck out instead of move to NaN
-                            renderer.Source.SetOcclusion(float.MaxValue);
-                            continue;
-                        }
-
-                        _midiSawmill?.Warning("Interrupting positional audio, can't set position.");
-                        renderer.Source.StopPlaying();
-                    }
+                    renderer.Source.SetGlobal();
+                    continue;
                 }
+
+                MapCoordinates? mapPos = null;
+                if (renderer.TrackingCoordinates != null)
+                {
+                    mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
+                }
+                else if (renderer.TrackingEntity != null)
+                {
+                    mapPos = renderer.TrackingEntity.Transform.MapPosition;
+                }
+
+                if (mapPos != null)
+                {
+                    var pos = mapPos.Value;
+                    if (pos.MapId != _eyeManager.CurrentMap)
+                    {
+                        renderer.Source.SetVolume(-10000000);
+                    }
+                    else
+                    {
+                        var sourceRelative = _eyeManager.CurrentEye.Position.Position - pos.Position;
+                        var occlusion = 0f;
+                        if (sourceRelative.Length > 0)
+                        {
+                            occlusion = _broadPhaseSystem.IntersectRayPenetration(
+                                pos.MapId,
+                                new CollisionRay(
+                                    pos.Position,
+                                    sourceRelative.Normalized,
+                                    OcclusionCollisionMask),
+                                sourceRelative.Length,
+                                renderer.TrackingEntity);
+                        }
+
+                        renderer.Source.SetOcclusion(occlusion);
+                    }
+
+                    if (renderer.Source.SetPosition(pos.Position))
+                    {
+                        continue;
+                    }
+
+                    if (renderer.TrackingEntity != null)
+                    {
+                        renderer.Source.SetVelocity(renderer.TrackingEntity.GlobalLinearVelocity());
+                    }
+
+                    if (float.IsNaN(pos.Position.X) || float.IsNaN(pos.Position.Y))
+                    {
+                        // just duck out instead of move to NaN
+                        renderer.Source.SetOcclusion(float.MaxValue);
+                        continue;
+                    }
+
+                    _midiSawmill?.Warning("Interrupting positional audio, can't set position.");
+                    renderer.Source.StopPlaying();
+                }
+            }
+
+            _volumeDirty = false;
         }
 
         /// <summary>
@@ -346,6 +358,7 @@ namespace Robust.Client.Audio.Midi
             while (_alive)
             {
                 lock (_renderers)
+                {
                     for (var i = 0; i < _renderers.Count; i++)
                     {
                         var renderer = _renderers[i];
@@ -353,10 +366,11 @@ namespace Robust.Client.Audio.Midi
                             renderer.Render();
                         else
                         {
-                            ((IMidiRenderer)renderer).InternalDispose();
+                            renderer.InternalDispose();
                             _renderers.Remove(renderer);
                         }
                     }
+                }
 
                 Thread.Sleep(1);
             }
@@ -367,9 +381,13 @@ namespace Robust.Client.Audio.Midi
             _alive = false;
             _midiThread?.Join();
             _settings?.Dispose();
-            foreach (var renderer in _renderers)
+
+            lock (_renderers)
             {
-                renderer?.Dispose();
+                foreach (var renderer in _renderers)
+                {
+                    renderer?.Dispose();
+                }
             }
 
             if (FluidsynthInitialized && !_failedInitialize)
@@ -424,6 +442,7 @@ namespace Robust.Client.Audio.Midi
                 var span = new Span<byte>(buf.ToPointer(), length);
                 var stream = _openStreams[(int) sfHandle];
 
+                // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
                 try
                 {
                     // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
@@ -447,6 +466,7 @@ namespace Robust.Client.Audio.Midi
                 {
                     return -1;
                 }
+
                 return 0;
             }
 
@@ -468,10 +488,12 @@ namespace Robust.Client.Audio.Midi
 
             public override int Close(IntPtr sfHandle)
             {
-                var stream = _openStreams[(int) sfHandle];
+                if (!_openStreams.Remove((int) sfHandle, out var stream))
+                    return -1;
+
                 stream.Dispose();
-                _openStreams.Remove((int) sfHandle);
                 return 0;
+
             }
         }
     }

Robust.Client/Audio/Midi/MidiRenderer.cs

@@ -7,7 +7,9 @@ using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Utility;
+using Robust.Shared.ViewVariables;
 using MidiEvent = NFluidsynth.MidiEvent;
 
 namespace Robust.Client.Audio.Midi
@@ -21,6 +23,17 @@ namespace Robust.Client.Audio.Midi
 
     public interface IMidiRenderer : IDisposable
     {
+
+        /// <summary>
+        ///     The buffered audio source of this renderer.
+        /// </summary>
+        internal IClydeBufferedAudioSource Source { get; }
+
+        /// <summary>
+        ///     Whether this renderer has been disposed or not.
+        /// </summary>
+        bool Disposed { get; }
+
         /// <summary>
         ///     This controls whether the midi file being played will loop or not.
         /// </summary>
@@ -110,6 +123,11 @@ namespace Robust.Client.Audio.Midi
         /// </summary>
         void StopAllNotes();
 
+        /// <summary>
+        ///     Render and play MIDI to the audio source.
+        /// </summary>
+        internal void Render();
+
         /// <summary>
         ///     Loads a new soundfont into the renderer.
         /// </summary>
@@ -159,7 +177,7 @@ namespace Robust.Client.Audio.Midi
         internal void InternalDispose();
     }
 
-    public class MidiRenderer : IMidiRenderer
+    internal class MidiRenderer : IMidiRenderer
     {
         [Dependency] private readonly IClydeAudio _clydeAudio = default!;
         [Dependency] private readonly ITaskManager _taskManager = default!;
@@ -186,10 +204,16 @@ namespace Robust.Client.Audio.Midi
         private const int SampleRate = 44100;
         private const int Buffers = SampleRate / 2205;
         private readonly object _playerStateLock = new();
+        private bool _debugEvents = false;
         private SequencerClientId _synthRegister;
+        private SequencerClientId _debugRegister;
         public IClydeBufferedAudioSource Source { get; set; }
+        IClydeBufferedAudioSource IMidiRenderer.Source => Source;
+
+        [ViewVariables]
         public bool Disposed { get; private set; } = false;
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public byte MidiProgram
         {
             get => _midiProgram;
@@ -203,6 +227,7 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public byte MidiBank
         {
             get => _midiBank;
@@ -216,6 +241,7 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public uint MidiSoundfont
         {
             get => _midiSoundfont;
@@ -229,10 +255,16 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public bool DisablePercussionChannel { get; set; } = true;
+
+        [ViewVariables(VVAccess.ReadWrite)]
         public bool DisableProgramChangeEvent { get; set; } = true;
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public int PlayerTotalTick => _player?.GetTotalTicks ?? 0;
+
+        [ViewVariables(VVAccess.ReadWrite)]
         public int PlayerTick
         {
             get => _player?.CurrentTick ?? 0;
@@ -243,12 +275,19 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public uint SequencerTick => _sequencer?.Tick ?? 0;
+
+        [ViewVariables(VVAccess.ReadWrite)]
         public double SequencerTimeScale => _sequencer?.TimeScale ?? 0;
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public bool Mono { get; set; }
+
+        [ViewVariables]
         public MidiRendererStatus Status { get; private set; } = MidiRendererStatus.None;
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public bool LoopMidi
         {
             get => _loopMidi;
@@ -260,10 +299,11 @@ namespace Robust.Client.Audio.Midi
             }
         }
 
+        [ViewVariables(VVAccess.ReadWrite)]
         public IEntity? TrackingEntity { get; set; } = null;
-        public EntityCoordinates? TrackingCoordinates { get; set; } = null;
 
-        internal bool Free { get; set; } = false;
+        [ViewVariables(VVAccess.ReadWrite)]
+        public EntityCoordinates? TrackingCoordinates { get; set; } = null;
 
         internal MidiRenderer(Settings settings, SoundFontLoader soundFontLoader, bool mono = true)
         {
@@ -276,6 +316,7 @@ namespace Robust.Client.Audio.Midi
             _soundFontLoader = soundFontLoader;
             _synth = new Synth(_settings);
             _sequencer = new Sequencer(false);
+            _debugRegister = _sequencer.RegisterClient("honk", DumpSequencerEvent);
             _synthRegister = _sequencer.RegisterFluidsynth(_synth);
 
             _synth.AddSoundFontLoader(soundFontLoader);
@@ -285,6 +326,27 @@ namespace Robust.Client.Audio.Midi
             Source.StartPlaying();
         }
 
+        private void DumpSequencerEvent(uint time, SequencerEvent @event)
+        {
+            // ReSharper disable once UseStringInterpolation
+            _midiSawmill.Debug(string.Format(
+                "{0:D8}: {1} chan:{2:D2} key:{3:D5} bank:{4:D2} ctrl:{5:D5} dur:{6:D5} pitch:{7:D5} prog:{8:D3} val:{9:D5} vel:{10:D5}",
+                time,
+                @event.Type.ToString().PadLeft(22),
+                @event.Channel,
+                @event.Key,
+                @event.Bank,
+                @event.Control,
+                @event.Duration,
+                @event.Pitch,
+                @event.Program,
+                @event.Value,
+                @event.Velocity));
+
+            @event.Dest = _synthRegister;
+            _sequencer.SendNow(@event);
+        }
+
         public bool OpenInput()
         {
             if (Disposed)
@@ -294,7 +356,11 @@ namespace Robust.Client.Audio.Midi
             Status = MidiRendererStatus.Input;
             StopAllNotes();
 
-            _driver = new MidiDriver(_settings, MidiDriverEventHandler);
+            lock (_playerStateLock)
+            {
+                _driver = new MidiDriver(_settings, MidiDriverEventHandler);
+            }
+
             return true;
         }
 
@@ -332,8 +398,13 @@ namespace Robust.Client.Audio.Midi
         {
             if (Status != MidiRendererStatus.Input) return false;
             Status = MidiRendererStatus.None;
-            _driver?.Dispose();
-            _driver = null;
+
+            lock (_playerStateLock)
+            {
+                _driver?.Dispose();
+                _driver = null;
+            }
+
             StopAllNotes();
             return true;
         }
@@ -357,7 +428,8 @@ namespace Robust.Client.Audio.Midi
 
         public void StopAllNotes()
         {
-            _synth.AllNotesOff(-1);
+            lock(_playerStateLock)
+                _synth.AllNotesOff(-1);
         }
 
         public void LoadSoundfont(string filename, bool resetPresets = false)
@@ -372,13 +444,15 @@ namespace Robust.Client.Audio.Midi
         public event Action<Shared.Audio.Midi.MidiEvent>? OnMidiEvent;
         public event Action? OnMidiPlayerFinished;
 
-        internal void Render(int length = SampleRate / 250)
+        void IMidiRenderer.Render()
+        {
+            Render();
+        }
+
+        private void Render(int length = SampleRate / 250)
         {
             if (Disposed) return;
 
-            // SSE needs this.
-            DebugTools.Assert(length % 4 == 0, "Sample length must be multiple of 4");
-
             var buffersProcessed = Source.GetNumberOfBuffersProcessed();
             if(buffersProcessed == Buffers) _midiSawmill.Warning("MIDI buffer overflow!");
             if (buffersProcessed == 0) return;
@@ -393,36 +467,16 @@ namespace Robust.Client.Audio.Midi
                 Source.GetBuffersProcessed(buffers);
 
                 lock (_playerStateLock)
+                {
+                    // _sequencer.Process(10);
                     _synth?.WriteSampleFloat(length * buffers.Length, audio, 0, Mono ? 1 : 2,
                         audio, Mono ? length * buffers.Length : 1, Mono ? 1 : 2);
-
+                }
                 if (Mono) // Turn audio to mono
                 {
                     var l = length * buffers.Length;
 
-                    if (Sse.IsSupported)
-                    {
-                        fixed (float* ptr = audio)
-                        {
-                            for (var j = 0; j < l; j += 4)
-                            {
-                                var k = j + l;
-
-                                var jV = Sse.LoadVector128(ptr + j);
-                                var kV = Sse.LoadVector128(ptr + k);
-
-                                Sse.Store(j + ptr, Sse.Add(jV, kV));
-                            }
-                        }
-                    }
-                    else
-                    {
-                        for (var j = 0; j < l; j++)
-                        {
-                            var k = j + l;
-                            audio[j] = ((audio[k] + audio[j]));
-                        }
-                    }
+                    NumericsHelpers.Add(audio[..l], audio[l..]);
                 }
 
                 for (var i = 0; i < buffers.Length; i++)
@@ -452,6 +506,7 @@ namespace Robust.Client.Audio.Midi
             var timestamp = SequencerTick;
             var midiEv = (Shared.Audio.Midi.MidiEvent) midiEvent;
             midiEv.Tick = timestamp;
+            midiEvent.Dispose();
             SendMidiEvent(midiEv);
             return 0;
         }
@@ -462,6 +517,7 @@ namespace Robust.Client.Audio.Midi
             var timestamp = SequencerTick;
             var midiEv = (Shared.Audio.Midi.MidiEvent) midiEvent;
             midiEv.Tick = timestamp;
+            midiEvent.Dispose();
             SendMidiEvent(midiEv);
             return 0;
         }
@@ -478,16 +534,16 @@ namespace Robust.Client.Audio.Midi
                 lock(_playerStateLock)
                     switch (midiEvent.Type)
                     {
-                        // Note On 0x80
-                        case 144:
-                            _synth.NoteOn(midiEvent.Channel, midiEvent.Key, midiEvent.Velocity);
-                            break;
-
-                        // Note Off - 0x90
+                        // Note Off - 0x80
                         case 128:
                             _synth.NoteOff(midiEvent.Channel, midiEvent.Key);
                             break;
 
+                        // Note On 0x90
+                        case 144:
+                            _synth.NoteOn(midiEvent.Channel, midiEvent.Key, midiEvent.Velocity);
+                            break;
+
                         // After Touch - 0xA
                         case 160:
                             _synth.KeyPressure(midiEvent.Channel, midiEvent.Key, midiEvent.Value);
@@ -522,6 +578,12 @@ namespace Robust.Client.Audio.Midi
                         case 81:
                         // System Messages - 0xF0
                         case 240:
+                            switch (midiEvent.Control)
+                            {
+                                case 11:
+                                    _synth.AllNotesOff(midiEvent.Channel);
+                                    break;
+                            }
                             return;
 
                         default:
@@ -543,7 +605,7 @@ namespace Robust.Client.Audio.Midi
             if (Disposed) return;
 
             var seqEv = (SequencerEvent) midiEvent;
-            seqEv.Dest = _synthRegister;
+            seqEv.Dest = _debugEvents ? _debugRegister : _synthRegister;
             _sequencer.SendAt(seqEv, time, absolute);
         }
 
@@ -566,10 +628,15 @@ namespace Robust.Client.Audio.Midi
         void IMidiRenderer.InternalDispose()
         {
             Source?.Dispose();
+            _driver?.Dispose();
+
+            // Do NOT dispose of the sequencer after the synth or it'll cause a segfault for some fucking reason.
+            _sequencer?.UnregisterClient(_debugRegister);
+            _sequencer?.UnregisterClient(_synthRegister);
+            _sequencer?.Dispose();
+            
             _synth?.Dispose();
             _player?.Dispose();
-            _driver?.Dispose();
-            _sequencer?.Dispose();
         }
     }
 }

Robust.Client/BaseClient.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Net;
 using Robust.Client.Debugging;
 using Robust.Client.GameObjects;
@@ -13,6 +13,7 @@ using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Network;
+using Robust.Shared.Players;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
@@ -25,6 +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!;
@@ -165,7 +167,7 @@ namespace Robust.Client
         ///     receiving states when they join the lobby.
         /// </summary>
         /// <param name="session">Session of the player.</param>
-        private void OnPlayerJoinedServer(IPlayerSession session)
+        private void OnPlayerJoinedServer(ICommonSession session)
         {
             DebugTools.Assert(RunLevel < ClientRunLevel.Connected);
             OnRunLevelChanged(ClientRunLevel.Connected);
@@ -175,20 +177,11 @@ namespace Robust.Client
             PlayerJoinedServer?.Invoke(this, new PlayerEventArgs(session));
         }
 
-        private void GameStartedSetup()
-        {
-            _entityManager.Startup();
-            _mapManager.Startup();
-
-            _timing.ResetSimTime();
-            _timing.Paused = false;
-        }
-
         /// <summary>
         ///     Player is joining the game
         /// </summary>
         /// <param name="session">Session of the player.</param>
-        private void OnPlayerJoinedGame(IPlayerSession session)
+        private void OnPlayerJoinedGame(ICommonSession session)
         {
             DebugTools.Assert(RunLevel >= ClientRunLevel.Connected);
             OnRunLevelChanged(ClientRunLevel.InGame);
@@ -218,12 +211,22 @@ namespace Robust.Client
             GameStoppedReset();
         }
 
+        private void GameStartedSetup()
+        {
+            _entityManager.Startup();
+            _mapManager.Startup();
+            _entityLookup.Startup();
+
+            _timing.ResetSimTime();
+            _timing.Paused = false;
+        }
+
         private void GameStoppedReset()
         {
             IoCManager.Resolve<INetConfigurationManager>().FlushMessages();
             _gameStates.Reset();
             _playMan.Shutdown();
-            IoCManager.Resolve<IEntityLookup>().Shutdown();
+            _entityLookup.Shutdown();
             _entityManager.Shutdown();
             _mapManager.Shutdown();
             _discord.ClearPresence();
@@ -295,12 +298,12 @@ namespace Robust.Client
         /// <summary>
         ///     The session that triggered the event.
         /// </summary>
-        private IPlayerSession? Session { get; }
+        private ICommonSession? Session { get; }
 
         /// <summary>
         ///     Constructs a new instance of the class.
         /// </summary>
-        public PlayerEventArgs(IPlayerSession? session)
+        public PlayerEventArgs(ICommonSession? session)
         {
             Session = session;
         }

Robust.Client/ClientIoC.cs

@@ -45,14 +45,16 @@ namespace Robust.Client
             IoCManager.Register<IMapManagerInternal, ClientMapManager>();
             IoCManager.Register<IClientMapManager, ClientMapManager>();
             IoCManager.Register<IEntityManager, ClientEntityManager>();
-            IoCManager.Register<IEntityLookup, SharedEntityLookup>();
+            IoCManager.Register<IEntityLookup, EntityLookup>();
+            IoCManager.Register<IReflectionManager, ClientReflectionManager>();
+            IoCManager.Register<IConsoleHost, ClientConsoleHost>();
+            IoCManager.Register<IClientConsoleHost, ClientConsoleHost>();
             IoCManager.Register<IComponentFactory, ClientComponentFactory>();
             IoCManager.Register<ITileDefinitionManager, ClydeTileDefinitionManager>();
             IoCManager.Register<IClydeTileDefinitionManager, ClydeTileDefinitionManager>();
             IoCManager.Register<GameController, GameController>();
             IoCManager.Register<IGameController, GameController>();
             IoCManager.Register<IGameControllerInternal, GameController>();
-            IoCManager.Register<IReflectionManager, ClientReflectionManager>();
             IoCManager.Register<IResourceManager, ResourceCache>();
             IoCManager.Register<IResourceManagerInternal, ResourceCache>();
             IoCManager.Register<IResourceCache, ResourceCache>();
@@ -72,8 +74,6 @@ namespace Robust.Client
             IoCManager.Register<IDebugDrawingManager, DebugDrawingManager>();
             IoCManager.Register<ILightManager, LightManager>();
             IoCManager.Register<IDiscordRichPresence, DiscordRichPresence>();
-            IoCManager.Register<IClientConsoleHost, ClientConsoleHost>();
-            IoCManager.Register<IConsoleHost, ClientConsoleHost>();
             IoCManager.Register<IMidiManager, MidiManager>();
             IoCManager.Register<IAuthManager, AuthManager>();
             switch (mode)

Robust.Client/CommandLineArgs.cs

@@ -17,6 +17,7 @@ namespace Robust.Client
         public bool Launcher { get; }
         public string? Username { get; }
         public IReadOnlyCollection<(string key, string value)> CVars { get; }
+        public IReadOnlyCollection<(string key, string value)> LogLevels { get; }
 
         // Manual parser because C# has no good command line parsing libraries. Also dependencies bad.
         // Also I don't like spending 100ms parsing command line args. Do you?
@@ -31,6 +32,7 @@ namespace Robust.Client
             var launcher = false;
             string? username = null;
             var cvars = new List<(string, string)>();
+            var logLevels = new List<(string, string)>();
             var mountOptions = new MountOptions();
 
             using var enumerator = args.GetEnumerator();
@@ -124,6 +126,26 @@ namespace Robust.Client
 
                     mountOptions.DirMounts.Add(enumerator.Current);
                 }
+                else if (arg == "--loglevel")
+                {
+                    if (!enumerator.MoveNext())
+                    {
+                        C.WriteLine("Missing loglevel sawmill.");
+                        return false;
+                    }
+
+                    var loglevel = enumerator.Current;
+                    DebugTools.AssertNotNull(loglevel);
+                    var pos = loglevel.IndexOf('=');
+
+                    if (pos == -1)
+                    {
+                        C.WriteLine("Expected = in loglevel.");
+                        return false;
+                    }
+
+                    logLevels.Add((loglevel[..pos], loglevel[(pos + 1)..]));
+                }
                 else if (arg == "--help")
                 {
                     PrintHelp();
@@ -142,6 +164,7 @@ namespace Robust.Client
                 launcher,
                 username,
                 cvars,
+                logLevels,
                 connectAddress,
                 ss14Address,
                 mountOptions);
@@ -162,6 +185,7 @@ Options:
   --launcher          Run in launcher mode (no main menu, auto connect).
   --username          Override username.
   --cvar              Specifies an additional cvar overriding the config file. Syntax is <key>=<value>
+  --loglevel          Specifies an additional sawmill log level overriding the default values. Syntax is <key>=<value>
   --mount-dir         Resource directory to mount.
   --mount-zip         Resource zip to mount.
   --help              Display this help text and exit.
@@ -175,6 +199,7 @@ Options:
             bool launcher,
             string? username,
             IReadOnlyCollection<(string key, string value)> cVars,
+            IReadOnlyCollection<(string key, string value)> logLevels,
             string connectAddress, string? ss14Address,
             MountOptions mountOptions)
         {
@@ -184,6 +209,7 @@ Options:
             Launcher = launcher;
             Username = username;
             CVars = cVars;
+            LogLevels = logLevels;
             ConnectAddress = connectAddress;
             Ss14Address = ss14Address;
             MountOptions = mountOptions;

Robust.Client/Console/ClientConsoleHost.cs

@@ -36,7 +36,7 @@ namespace Robust.Client.Console
             Message = message;
         }
     }
-    
+
     /// <inheritdoc cref="IClientConsoleHost" />
     internal class ClientConsoleHost : ConsoleHost, IClientConsoleHost
     {
@@ -45,11 +45,15 @@ namespace Robust.Client.Console
         /// <inheritdoc />
         public void Initialize()
         {
-            NetManager.RegisterNetMessage<MsgConCmdReg>(MsgConCmdReg.NAME, HandleConCmdReg);
-            NetManager.RegisterNetMessage<MsgConCmdAck>(MsgConCmdAck.NAME, HandleConCmdAck);
-            NetManager.RegisterNetMessage<MsgConCmd>(MsgConCmd.NAME, ProcessCommand);
+            NetManager.RegisterNetMessage<MsgConCmdReg>(HandleConCmdReg);
+            NetManager.RegisterNetMessage<MsgConCmdAck>(HandleConCmdAck);
+            NetManager.RegisterNetMessage<MsgConCmd>(ProcessCommand);
 
-            Reset();
+            _requestedCommands = false;
+            NetManager.Connected += OnNetworkConnected;
+
+            LoadConsoleCommands();
+            SendServerCommandRequest();
             LogManager.RootSawmill.AddHandler(new DebugConsoleLogHandler(this));
         }
 
@@ -61,17 +65,6 @@ namespace Robust.Client.Console
             ExecuteCommand(null, text);
         }
 
-        /// <inheritdoc />
-        public void Reset()
-        {
-            AvailableCommands.Clear();
-            _requestedCommands = false;
-            NetManager.Connected += OnNetworkConnected;
-
-            LoadConsoleCommands();
-            SendServerCommandRequest();
-        }
-
         /// <inheritdoc />
         public event EventHandler<AddStringArgs>? AddString;
 
@@ -97,7 +90,7 @@ namespace Robust.Client.Console
                 return;
 
             // echo the command locally
-            WriteError(null, "> " + command);
+            WriteLine(null, "> " + command);
 
             //Commands are processed locally and then sent to the server to be processed there again.
             var args = new List<string>();
@@ -142,6 +135,9 @@ namespace Robust.Client.Console
         private void OutputText(string text, bool local, bool error)
         {
             AddString?.Invoke(this, new AddStringArgs(text, local, error));
+
+            var level = error ? LogLevel.Warning : LogLevel.Info;
+            Logger.LogS(level, "CON", text);
         }
 
         private void OnNetworkConnected(object? sender, NetChannelArgs netChannelArgs)

Robust.Client/Console/Commands/Debug.cs

@@ -27,6 +27,7 @@ using Robust.Shared.Reflection;
 using Robust.Shared.Serialization;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
+using static Robust.Client.UserInterface.Controls.BoxContainer;
 
 namespace Robust.Client.Console.Commands
 {
@@ -77,7 +78,7 @@ namespace Robust.Client.Console.Commands
                     message.Append($"net ID: {registration.NetID}");
                 }
 
-                message.Append($", NSE: {registration.NetworkSynchronizeExistence}, references:");
+                message.Append($", References:");
 
                 shell.WriteLine(message.ToString());
 
@@ -536,7 +537,10 @@ namespace Robust.Client.Console.Commands
             var scroll = new ScrollContainer();
             tabContainer.AddChild(scroll);
             //scroll.SetAnchorAndMarginPreset(Control.LayoutPreset.Wide);
-            var vBox = new VBoxContainer();
+            var vBox = new BoxContainer
+            {
+                Orientation = LayoutOrientation.Vertical
+            };
             scroll.AddChild(vBox);
 
             var progressBar = new ProgressBar { MaxValue = 10, Value = 5 };
@@ -594,7 +598,10 @@ namespace Robust.Client.Console.Commands
             }
 
             var group = new ButtonGroup();
-            var vBoxRadioButtons = new VBoxContainer();
+            var vBoxRadioButtons = new BoxContainer
+            {
+                Orientation = LayoutOrientation.Vertical
+            };
             for (var i = 0; i < 10; i++)
             {
                 vBoxRadioButtons.AddChild(new Button
@@ -610,8 +617,9 @@ namespace Robust.Client.Console.Commands
 
             TabContainer.SetTabTitle(vBoxRadioButtons, "Radio buttons!!");
 
-            tabContainer.AddChild(new VBoxContainer
+            tabContainer.AddChild(new BoxContainer
             {
+                Orientation = LayoutOrientation.Vertical,
                 Name = "Slider",
                 Children =
                 {

Robust.Client/Console/Commands/LightBBCommand.cs

@@ -0,0 +1,19 @@
+#if DEBUG
+using Robust.Client.GameObjects;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Client.Console.Commands
+{
+    internal sealed class LightDebugCommand : IConsoleCommand
+    {
+        public string Command => "lightbb";
+        public string Description => "Toggles whether to show light bounding boxes";
+        public string Help => $"{Command}";
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            EntitySystem.Get<DebugLightTreeSystem>().Enabled ^= true;
+        }
+    }
+}
+#endif

Robust.Client/Console/Commands/MonitorCommands.cs

@@ -25,6 +25,34 @@ namespace Robust.Client.Console.Commands
         }
     }
 
+    [UsedImplicitly]
+    public sealed class MonitorInfoCommand : IConsoleCommand
+    {
+        public string Command => "monitorinfo";
+        public string Description => "";
+        public string Help => "Usage: monitorinfo <id>";
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            if (args.Length < 1)
+            {
+                shell.WriteError("Expected one argument.");
+                return;
+            }
+
+            var clyde = IoCManager.Resolve<IClyde>();
+            var monitor = clyde.EnumerateMonitors().Single(c => c.Id == int.Parse(args[0]));
+
+            shell.WriteLine($"{monitor.Id}: {monitor.Name}");
+            shell.WriteLine($"Video modes:");
+
+            foreach (var mode in monitor.VideoModes)
+            {
+                shell.WriteLine($"  {mode.Width}x{mode.Height} {mode.RefreshRate} Hz {mode.RedBits}/{mode.GreenBits}/{mode.BlueBits}");
+            }
+        }
+    }
+
     [UsedImplicitly]
     public sealed class SetMonitorCommand : IConsoleCommand
     {

Robust.Client/Console/Commands/Scripting.cs

@@ -1,6 +1,5 @@
 using Robust.Shared.Console;
 using Robust.Shared.IoC;
-using Robust.Shared.Localization;
 
 namespace Robust.Client.Console.Commands
 {
@@ -41,7 +40,7 @@ namespace Robust.Client.Console.Commands
             var mgr = IoCManager.Resolve<IScriptClient>();
             if (!mgr.CanScript)
             {
-                shell.WriteError(Loc.GetString("You do not have server side scripting permission."));
+                shell.WriteError("You do not have server side scripting permission.");
                 return;
             }
 

Robust.Client/Console/IClientConsoleHost.cs

@@ -11,11 +11,6 @@ namespace Robust.Client.Console
         /// </summary>
         void Initialize();
 
-        /// <summary>
-        /// Resets the console to a post-initialized state.
-        /// </summary>
-        void Reset();
-
         event EventHandler<AddStringArgs> AddString;
         event EventHandler<AddFormattedMessageArgs> AddFormatted;
 

Robust.Client/Console/ScriptClient.cs

@@ -17,11 +17,11 @@ namespace Robust.Client.Console
 
         public void Initialize()
         {
-            _netManager.RegisterNetMessage<MsgScriptStop>(MsgScriptStop.NAME);
-            _netManager.RegisterNetMessage<MsgScriptEval>(MsgScriptEval.NAME);
-            _netManager.RegisterNetMessage<MsgScriptStart>(MsgScriptStart.NAME);
-            _netManager.RegisterNetMessage<MsgScriptResponse>(MsgScriptResponse.NAME, ReceiveScriptResponse);
-            _netManager.RegisterNetMessage<MsgScriptStartAck>(MsgScriptStartAck.NAME, ReceiveScriptStartAckResponse);
+            _netManager.RegisterNetMessage<MsgScriptStop>();
+            _netManager.RegisterNetMessage<MsgScriptEval>();
+            _netManager.RegisterNetMessage<MsgScriptStart>();
+            _netManager.RegisterNetMessage<MsgScriptResponse>(ReceiveScriptResponse);
+            _netManager.RegisterNetMessage<MsgScriptStartAck>(ReceiveScriptStartAckResponse);
         }
 
         private void ReceiveScriptStartAckResponse(MsgScriptStartAck message)
@@ -30,7 +30,8 @@ namespace Robust.Client.Console
 
             var console = new ScriptConsoleServer(this, session);
             _activeConsoles.Add(session, console);
-            console.Open();
+            // FIXME: When this is Open(), resizing the window will cause its position to get NaN'd.
+            console.OpenCentered();
         }
 
         private void ReceiveScriptResponse(MsgScriptResponse message)

Robust.Client/Console/ScriptConsoleClient.cs

@@ -1,5 +1,4 @@
 #if CLIENT_SCRIPTING
-using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
@@ -14,11 +13,11 @@ using Microsoft.CodeAnalysis.Text;
 using Robust.Client.UserInterface.CustomControls;
 using Robust.Client.ViewVariables;
 using Robust.Shared.IoC;
-using Robust.Shared.Localization;
-using Robust.Shared.Maths;
 using Robust.Shared.Reflection;
 using Robust.Shared.Scripting;
 using Robust.Shared.Utility;
+using SixLabors.ImageSharp;
+using Color = Robust.Shared.Maths.Color;
 
 #nullable enable
 
@@ -43,14 +42,14 @@ namespace Robust.Client.Console
 
         public ScriptConsoleClient()
         {
-            Title = Loc.GetString("Robust C# Interactive (CLIENT)");
+            Title = "Robust C# Interactive (CLIENT)";
             ScriptInstanceShared.InitDummy();
 
             _globals = new ScriptGlobalsImpl(this);
 
             IoCManager.InjectDependencies(this);
 
-            OutputPanel.AddText(Loc.GetString(@"Robust C# interactive console (CLIENT)."));
+            OutputPanel.AddText("Robust C# interactive console (CLIENT).");
             OutputPanel.AddText(">");
         }
 
@@ -118,7 +117,7 @@ namespace Robust.Client.Console
             }
             else
             {
-                var options = ScriptInstanceShared.GetScriptOptions(_reflectionManager);
+                var options = ScriptInstanceShared.GetScriptOptions(_reflectionManager).AddReferences(typeof(Image).Assembly);
                 newScript = CSharpScript.Create(code, options, typeof(ScriptGlobals));
             }
 

Robust.Client/Console/WatchWindow.cs

@@ -8,11 +8,10 @@ using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared.IoC;
-using Robust.Shared.Localization;
-using Robust.Shared.Maths;
 using Robust.Shared.Reflection;
 using Robust.Shared.Scripting;
 using Robust.Shared.Timing;
+using static Robust.Client.UserInterface.Controls.BoxContainer;
 
 namespace Robust.Client.Console
 {
@@ -20,7 +19,7 @@ namespace Robust.Client.Console
     {
         private readonly IReflectionManager _reflectionManager;
 
-        private readonly VBoxContainer _watchesVBox;
+        private readonly BoxContainer _watchesVBox;
         private readonly LineEdit _addWatchEdit;
         private readonly Button _addWatchButton;
 
@@ -31,29 +30,32 @@ namespace Robust.Client.Console
 
             ScriptInstanceShared.InitDummy();
 
-            Title = Loc.GetString("Watch Window");
+            Title = "Watch Window";
 
-            var mainVBox = new VBoxContainer
+            var mainVBox = new BoxContainer
             {
+                Orientation = LayoutOrientation.Vertical,
                 MinSize = (500, 300),
                 Children =
                 {
-                    (_watchesVBox = new VBoxContainer
+                    (_watchesVBox = new BoxContainer
                     {
+                        Orientation = LayoutOrientation.Vertical,
                         VerticalExpand = true
                     }),
-                    new HBoxContainer
+                    new BoxContainer
                     {
+                        Orientation = LayoutOrientation.Horizontal,
                         Children =
                         {
                             (_addWatchEdit = new HistoryLineEdit
                             {
                                 HorizontalExpand = true,
-                                PlaceHolder = Loc.GetString("Add watch (C# interactive)")
+                                PlaceHolder = "Add watch (C# interactive)"
                             }),
                             (_addWatchButton = new Button
                             {
-                                Text = Loc.GetString("Add")
+                                Text = "Add"
                             })
                         }
                     }
@@ -107,8 +109,9 @@ namespace Robust.Client.Console
                 Button delButton;
                 _runner = runner;
 
-                AddChild(new HBoxContainer
+                AddChild(new BoxContainer
                 {
+                    Orientation = LayoutOrientation.Horizontal,
                     Children =
                     {
                         (_outputLabel = new Label
@@ -118,7 +121,7 @@ namespace Robust.Client.Console
                         }),
                         (delButton = new Button
                         {
-                            Text = Loc.GetString("Remove")
+                            Text = "Remove"
                         }),
                     }
                 });
@@ -168,8 +171,9 @@ namespace Robust.Client.Console
             public CompilationErrorControl(string message)
             {
                 Button delButton;
-                AddChild(new HBoxContainer
+                AddChild(new BoxContainer
                 {
+                    Orientation = LayoutOrientation.Horizontal,
                     Children =
                     {
                         new Label
@@ -178,7 +182,7 @@ namespace Robust.Client.Console
                             ClipText = true,
                             HorizontalExpand = true
                         },
-                        (delButton = new Button {Text = Loc.GetString("Remove")})
+                        (delButton = new Button {Text = "Remove"})
                     }
                 });
 

Robust.Client/ContentStart.cs

@@ -7,13 +7,13 @@ namespace Robust.Client
 #if FULL_RELEASE
             throw new System.InvalidOperationException("ContentStart.Start is not available on a full release.");
 #else
-            GameController.Start(args, true);
+            GameController.Start(args, new GameControllerOptions(), true);
 #endif
         }
 
         public static void StartLibrary(string[] args, GameControllerOptions options)
         {
-            GameController.Start(args, true, null, options);
+            GameController.Start(args, options, true, null);
         }
     }
 }

Robust.Client/Debugging/DebugDrawing.cs

@@ -23,7 +23,7 @@ namespace Robust.Client.Debugging
         [Dependency] private readonly IOverlayManager _overlayManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
-        [Dependency] private readonly IEntityManager _entityManager = default!;
+        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly IInputManager _inputManager = default!;
 
@@ -70,7 +70,7 @@ namespace Robust.Client.Debugging
 
                 if (value && !_overlayManager.HasOverlay<EntityPositionOverlay>())
                 {
-                    _overlayManager.AddOverlay(new EntityPositionOverlay(_entityManager, _eyeManager));
+                    _overlayManager.AddOverlay(new EntityPositionOverlay(_lookup, _eyeManager));
                 }
                 else
                 {
@@ -130,17 +130,17 @@ namespace Robust.Client.Debugging
                 {
                     if (body != _hoverBodies[0])
                     {
-                        DrawString(screenHandle, _font, drawPos + new Vector2(0, row * lineHeight), "------");
+                        screenHandle.DrawString(_font, drawPos + new Vector2(0, row * lineHeight), "------");
                         row++;
                     }
 
-                    DrawString(screenHandle, _font, drawPos + new Vector2(0, row * lineHeight), $"Ent: {body.Owner}");
+                    screenHandle.DrawString(_font, drawPos + new Vector2(0, row * lineHeight), $"Ent: {body.Owner}");
                     row++;
-                    DrawString(screenHandle, _font, drawPos + new Vector2(0, row * lineHeight), $"Layer: {Convert.ToString(body.CollisionLayer, 2)}");
+                    screenHandle.DrawString(_font, drawPos + new Vector2(0, row * lineHeight), $"Layer: {Convert.ToString(body.CollisionLayer, 2)}");
                     row++;
-                    DrawString(screenHandle, _font, drawPos + new Vector2(0, row * lineHeight), $"Mask: {Convert.ToString(body.CollisionMask, 2)}");
+                    screenHandle.DrawString(_font, drawPos + new Vector2(0, row * lineHeight), $"Mask: {Convert.ToString(body.CollisionMask, 2)}");
                     row++;
-                    DrawString(screenHandle, _font, drawPos + new Vector2(0, row * lineHeight), $"Enabled: {body.CanCollide}, Hard: {body.Hard}, Anchored: {(body).BodyType == BodyType.Static}");
+                    screenHandle.DrawString(_font, drawPos + new Vector2(0, row * lineHeight), $"Enabled: {body.CanCollide}, Hard: {body.Hard}, Anchored: {(body).BodyType == BodyType.Static}");
                     row++;
                 }
 
@@ -171,14 +171,15 @@ namespace Robust.Client.Debugging
                     // all entities have a TransformComponent
                     var transform = physBody.Owner.Transform;
 
-                    var worldBox = physBody.GetWorldAABB(_mapManager);
+                    var worldBox = physBody.GetWorldAABB();
                     if (worldBox.IsEmpty()) continue;
 
                     foreach (var fixture in physBody.Fixtures)
                     {
                         var shape = fixture.Shape;
-                        var sleepPercent = physBody.Awake ? physBody.SleepTime / sleepThreshold : 1.0f;
+                        var sleepPercent = physBody.Awake ? 0.0f : 1.0f;
                         shape.DebugDraw(drawing, transform.WorldMatrix, in viewport, sleepPercent);
+                        drawing.SetTransform(in Matrix3.Identity);
                     }
 
                     foreach (var joint in physBody.Joints)
@@ -187,6 +188,7 @@ namespace Robust.Client.Debugging
                         drawnJoints.Add(joint);
 
                         joint.DebugDraw(drawing, in viewport);
+                        drawing.SetTransform(in Matrix3.Identity);
                     }
 
                     if (worldBox.Contains(mouseWorldPos))
@@ -199,17 +201,6 @@ namespace Robust.Client.Debugging
                 }
             }
 
-            private static void DrawString(DrawingHandleScreen handle, Font font, Vector2 pos, string str)
-            {
-                var baseLine = new Vector2(pos.X, font.GetAscent(1) + pos.Y);
-
-                foreach (var rune in str.EnumerateRunes())
-                {
-                    var advance = font.DrawChar(handle, rune, baseLine, 1, Color.White);
-                    baseLine += new Vector2(advance, 0);
-                }
-            }
-
             private class PhysDrawingAdapter : DebugDrawingHandle
             {
                 private readonly DrawingHandleWorld _handle;
@@ -270,14 +261,14 @@ namespace Robust.Client.Debugging
 
         private sealed class EntityPositionOverlay : Overlay
         {
-            private readonly IEntityManager _entityManager;
+            private readonly IEntityLookup _lookup;
             private readonly IEyeManager _eyeManager;
 
             public override OverlaySpace Space => OverlaySpace.WorldSpace;
 
-            public EntityPositionOverlay(IEntityManager entityManager, IEyeManager eyeManager)
+            public EntityPositionOverlay(IEntityLookup lookup, IEyeManager eyeManager)
             {
-                _entityManager = entityManager;
+                _lookup = lookup;
                 _eyeManager = eyeManager;
             }
 
@@ -286,18 +277,17 @@ namespace Robust.Client.Debugging
                 const float stubLength = 0.25f;
 
                 var worldHandle = (DrawingHandleWorld) args.DrawingHandle;
-                foreach (var entity in _entityManager.GetEntities())
+                var viewport = _eyeManager.GetWorldViewport();
+
+                foreach (var entity in _lookup.GetEntitiesIntersecting(_eyeManager.CurrentMap, viewport))
                 {
                     var transform = entity.Transform;
-                    if (transform.MapID != _eyeManager.CurrentMap ||
-                        !_eyeManager.GetWorldViewport().Contains(transform.WorldPosition))
-                    {
-                        continue;
-                    }
 
                     var center = transform.WorldPosition;
-                    var xLine = transform.WorldRotation.RotateVec(Vector2.UnitX);
-                    var yLine = transform.WorldRotation.RotateVec(Vector2.UnitY);
+                    var worldRotation = transform.WorldRotation;
+
+                    var xLine = worldRotation.RotateVec(Vector2.UnitX);
+                    var yLine = worldRotation.RotateVec(Vector2.UnitY);
 
                     worldHandle.DrawLine(center, center + xLine * stubLength, Color.Red);
                     worldHandle.DrawLine(center, center + yLine * stubLength, Color.Green);

Robust.Client/Debugging/DebugDrawingManager.cs

@@ -1,12 +1,12 @@
-using Robust.Shared.IoC;
-using Robust.Shared.Network.Messages;
 using System;
 using System.Collections.Generic;
 using Robust.Client.Graphics;
-using Robust.Shared.Maths;
-using Robust.Shared.Timing;
 using Robust.Shared.Enums;
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
 using Robust.Shared.Network;
+using Robust.Shared.Network.Messages;
+using Robust.Shared.Timing;
 
 namespace Robust.Client.Debugging
 {
@@ -54,7 +54,7 @@ namespace Robust.Client.Debugging
 
         public void Initialize()
         {
-            _net.RegisterNetMessage<MsgRay>(MsgRay.NAME, HandleDrawRay);
+            _net.RegisterNetMessage<MsgRay>(HandleDrawRay);
         }
 
         private void HandleDrawRay(MsgRay msg)

Robust.Client/GameController/GameController.Loader.cs

@@ -11,7 +11,7 @@ namespace Robust.Client
         {
             public void Main(IMainArgs args)
             {
-                Start(args.Args, contentStart: false, args);
+                Start(args.Args, new GameControllerOptions(), contentStart: false, args);
             }
         }
     }

Robust.Client/GameController/GameController.Standalone.cs

@@ -22,10 +22,10 @@ namespace Robust.Client
 
         public static void Main(string[] args)
         {
-            Start(args);
+            Start(args, new GameControllerOptions());
         }
 
-        public static void Start(string[] args, bool contentStart = false, IMainArgs? loaderArgs=null, GameControllerOptions? options = null)
+        public static void Start(string[] args, GameControllerOptions options, bool contentStart = false, IMainArgs? loaderArgs=null)
         {
             if (_hasStarted)
             {
@@ -40,7 +40,7 @@ namespace Robust.Client
             }
         }
 
-        private static void ParsedMain(CommandLineArgs args, bool contentStart, IMainArgs? loaderArgs, GameControllerOptions? options)
+        private static void ParsedMain(CommandLineArgs args, bool contentStart, IMainArgs? loaderArgs, GameControllerOptions options)
         {
             IoCManager.InitThread();
 
@@ -51,15 +51,13 @@ namespace Robust.Client
             var gc = IoCManager.Resolve<GameController>();
             gc.SetCommandLineArgs(args);
             gc._loaderArgs = loaderArgs;
-            if(options != null)
-                gc.Options = options;
 
             // When the game is ran with the startup executable being content,
             // we have to disable the separate load context.
             // Otherwise the content assemblies will be loaded twice which causes *many* fun bugs.
             gc.ContentStart = contentStart;
 
-            gc.Run(mode);
+            gc.Run(mode, options);
         }
 
         public void OverrideMainLoop(IGameLoop gameLoop)
@@ -67,9 +65,9 @@ namespace Robust.Client
             _mainLoop = gameLoop;
         }
 
-        public void Run(DisplayMode mode, Func<ILogHandler>? logHandlerFactory = null)
+        public void Run(DisplayMode mode, GameControllerOptions options, Func<ILogHandler>? logHandlerFactory = null)
         {
-            if (!StartupSystemSplash(logHandlerFactory))
+            if (!StartupSystemSplash(options, logHandlerFactory))
             {
                 Logger.Fatal("Failed to start game controller!");
                 return;

Robust.Client/GameController/GameController.cs

@@ -75,14 +75,12 @@ namespace Robust.Client
         public GameControllerOptions Options { get; private set; } = new();
         public InitialLaunchState LaunchState { get; private set; } = default!;
 
-        public bool LoadConfigAndUserData { get; set; } = true;
-
         public void SetCommandLineArgs(CommandLineArgs args)
         {
             _commandLineArgs = args;
         }
 
-        private bool StartupContinue(DisplayMode displayMode)
+        internal bool StartupContinue(DisplayMode displayMode)
         {
             _clyde.InitializePostWindowing();
             _clyde.SetWindowTitle(Options.DefaultWindowTitle);
@@ -95,7 +93,7 @@ namespace Robust.Client
             _modLoader.SetUseLoadContext(!ContentStart);
             _modLoader.SetEnableSandboxing(Options.Sandboxing);
 
-            if (!_modLoader.TryLoadModulesFrom(new ResourcePath("/Assemblies/"), Options.ContentModulePrefix))
+            if (!_modLoader.TryLoadModulesFrom(Options.AssemblyDirectory, Options.ContentModulePrefix))
             {
                 Logger.Fatal("Errors while loading content assemblies.");
                 return false;
@@ -125,7 +123,6 @@ namespace Robust.Client
             _prototypeManager.Resync();
             _mapManager.Initialize();
             _entityManager.Initialize();
-            IoCManager.Resolve<IEntityLookup>().Initialize();
             _gameStateManager.Initialize();
             _placementManager.Initialize();
             _viewVariablesManager.Initialize();
@@ -197,12 +194,35 @@ namespace Robust.Client
             return true;
         }
 
-        private bool StartupSystemSplash(Func<ILogHandler>? logHandlerFactory)
+        internal bool StartupSystemSplash(GameControllerOptions options, Func<ILogHandler>? logHandlerFactory)
         {
+            Options = options;
             ReadInitialLaunchState();
 
             SetupLogging(_logManager, logHandlerFactory ?? (() => new ConsoleLogHandler()));
 
+            if (_commandLineArgs != null)
+            {
+                foreach (var (sawmill, level) in _commandLineArgs.LogLevels)
+                {
+                    LogLevel? logLevel;
+                    if (level == "null")
+                        logLevel = null;
+                    else
+                    {
+                        if (!Enum.TryParse<LogLevel>(level, out var result))
+                        {
+                            System.Console.WriteLine($"LogLevel {level} does not exist!");
+                            continue;
+                        }
+                        logLevel = result;
+                    }
+                    _logManager.GetSawmill(sawmill).Level = logLevel;
+                }
+            }
+
+            ProgramShared.PrintRuntimeInfo(_logManager.RootSawmill);
+
             // Figure out user data directory.
             var userDataDir = GetUserDataDir();
 
@@ -213,7 +233,7 @@ namespace Robust.Client
             _configurationManager.LoadCVarsFromAssembly(typeof(GameController).Assembly); // Client
             _configurationManager.LoadCVarsFromAssembly(typeof(IConfigurationManager).Assembly); // Shared
 
-            if (LoadConfigAndUserData)
+            if (Options.LoadConfigAndUserData)
             {
                 var configFile = Path.Combine(userDataDir, Options.ConfigFileName);
                 if (File.Exists(configFile))
@@ -237,13 +257,13 @@ namespace Robust.Client
 
             ProfileOptSetup.Setup(_configurationManager);
 
-            _resourceCache.Initialize(LoadConfigAndUserData ? userDataDir : null);
+            _resourceCache.Initialize(Options.LoadConfigAndUserData ? userDataDir : null);
 
             var mountOptions = _commandLineArgs != null
                 ? MountOptions.Merge(_commandLineArgs.MountOptions, Options.MountOptions) : Options.MountOptions;
 
-            ProgramShared.DoMounts(_resourceCache, mountOptions, Options.ContentBuildDirectory,
-                _loaderArgs != null && !Options.ResourceMountDisabled, ContentStart);
+            ProgramShared.DoMounts(_resourceCache, mountOptions, Options.ContentBuildDirectory, Options.AssemblyDirectory,
+                Options.LoadContentResources, _loaderArgs != null && !Options.ResourceMountDisabled, ContentStart);
 
             if (_loaderArgs != null)
             {
@@ -450,7 +470,7 @@ namespace Robust.Client
             Clyde,
         }
 
-        private void Cleanup()
+        internal void Cleanup()
         {
             _networkManager.Shutdown("Client shutting down");
             _midiManager.Shutdown();

Robust.Client/GameControllerOptions.cs

@@ -42,6 +42,11 @@ namespace Robust.Client
         /// </summary>
         public string ContentBuildDirectory { get; init; } = "Content.Client";
 
+        /// <summary>
+        ///     Directory to load all assemblies from.
+        /// </summary>
+        public ResourcePath AssemblyDirectory { get; init; } = new(@"/Assemblies/");
+
         /// <summary>
         ///     Directory to load all prototypes from.
         /// </summary>
@@ -52,6 +57,16 @@ namespace Robust.Client
         /// </summary>
         public bool ResourceMountDisabled { get; init; } = false;
 
+        /// <summary>
+        ///     Whether to mount content resources when not on FULL_RELEASE.
+        /// </summary>
+        public bool LoadContentResources { get; init; } = true;
+
+        /// <summary>
+        ///     Whether to load config and user data.
+        /// </summary>
+        public bool LoadConfigAndUserData { get; init; } = true;
+
         /// <summary>
         ///     Whether to disable command line args server auto-connecting.
         /// </summary>

Robust.Client/GameObjects/ClientComponentFactory.cs

@@ -1,66 +1,41 @@
+using Robust.Shared.Console;
 using Robust.Shared.Containers;
 using Robust.Shared.GameObjects;
-using Robust.Shared.Physics;
+using Robust.Shared.IoC;
+using Robust.Shared.Reflection;
 
 namespace Robust.Client.GameObjects
 {
-    public class ClientComponentFactory : ComponentFactory
+    internal class ClientComponentFactory : ComponentFactory
     {
-        public ClientComponentFactory()
+        public ClientComponentFactory(IDynamicTypeFactoryInternal typeFactory, IReflectionManager reflectionManager, IConsoleHost conHost)
+            : base(typeFactory, reflectionManager, conHost)
         {
             // Required for the engine to work
-            Register<MetaDataComponent>();
-            RegisterReference<MetaDataComponent, IMetaDataComponent>();
-
-            // Required for the engine to work
-            Register<TransformComponent>();
-            RegisterReference<TransformComponent, ITransformComponent>();
-
-            Register<MapComponent>();
-            RegisterReference<MapComponent, IMapComponent>();
-
-            Register<MapGridComponent>();
-            RegisterReference<MapGridComponent, IMapGridComponent>();
-
-            Register<PhysicsComponent>();
-            RegisterReference<PhysicsComponent, IPhysBody>();
-
-            Register<CollisionWakeComponent>();
-
-            Register<ContainerManagerComponent>();
-            RegisterReference<ContainerManagerComponent, IContainerManager>();
-
             RegisterIgnore("KeyBindingInput");
 
-            Register<InputComponent>();
-
-            Register<SpriteComponent>();
-            RegisterReference<SpriteComponent, SharedSpriteComponent>();
-            RegisterReference<SpriteComponent, ISpriteComponent>();
-
-            Register<ClientOccluderComponent>();
-            RegisterReference<ClientOccluderComponent, OccluderComponent>();
-
-            Register<EyeComponent>();
-            RegisterReference<EyeComponent, SharedEyeComponent>();
-
-            Register<AppearanceComponent>();
-            RegisterReference<AppearanceComponent, SharedAppearanceComponent>();
-
-            Register<AppearanceTestComponent>();
-            Register<SnapGridComponent>();
-
-            Register<ClientUserInterfaceComponent>();
-            RegisterReference<ClientUserInterfaceComponent, SharedUserInterfaceComponent>();
-
-            Register<AnimationPlayerComponent>();
-
-            Register<TimerComponent>();
+            RegisterClass<MetaDataComponent>();
+            RegisterClass<TransformComponent>();
+            RegisterClass<MapComponent>();
+            RegisterClass<MapGridComponent>();
+            RegisterClass<PhysicsComponent>();
+            RegisterClass<CollisionWakeComponent>();
+            RegisterClass<ClientUserInterfaceComponent>();
+            RegisterClass<ContainerManagerComponent>();
+            RegisterClass<InputComponent>();
+            RegisterClass<SpriteComponent>();
+            RegisterClass<ClientOccluderComponent>();
+            RegisterClass<EyeComponent>();
+            RegisterClass<AppearanceComponent>();
+            RegisterClass<AppearanceTestComponent>();
+            RegisterClass<SnapGridComponent>();
+            RegisterClass<AnimationPlayerComponent>();
+            RegisterClass<TimerComponent>();
 
 #if DEBUG
-            Register<DebugExceptionOnAddComponent>();
-            Register<DebugExceptionInitializeComponent>();
-            Register<DebugExceptionStartupComponent>();
+            RegisterClass<DebugExceptionOnAddComponent>();
+            RegisterClass<DebugExceptionInitializeComponent>();
+            RegisterClass<DebugExceptionStartupComponent>();
 #endif
 
         }

Robust.Client/GameObjects/ClientEntityManager.cs

@@ -1,14 +1,10 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using JetBrains.Annotations;
 using Prometheus;
 using Robust.Client.GameStates;
-using Robust.Shared.Exceptions;
+using Robust.Client.Player;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
-using Robust.Shared.Log;
-using Robust.Shared.Map;
 using Robust.Shared.Network;
 using Robust.Shared.Network.Messages;
 using Robust.Shared.Timing;
@@ -21,6 +17,7 @@ namespace Robust.Client.GameObjects
     /// </summary>
     public sealed class ClientEntityManager : EntityManager, IClientEntityManagerInternal
     {
+        [Dependency] private readonly IPlayerManager _playerManager = default!;
         [Dependency] private readonly IClientNetManager _networkManager = default!;
         [Dependency] private readonly IClientGameStateManager _gameStateManager = default!;
         [Dependency] private readonly IGameTiming _gameTiming = default!;
@@ -67,7 +64,7 @@ namespace Robust.Client.GameObjects
         /// <inheritdoc />
         public void SetupNetworking()
         {
-            _networkManager.RegisterNetMessage<MsgEntity>(MsgEntity.NAME, HandleEntityNetworkMessage);
+            _networkManager.RegisterNetMessage<MsgEntity>(HandleEntityNetworkMessage);
         }
 
         public override void TickUpdate(float frameTime, Histogram? histogram)
@@ -109,15 +106,18 @@ namespace Robust.Client.GameObjects
         }
 
         /// <inheritdoc />
+        [Obsolete("Component Messages are deprecated, use Entity Events instead.")]
         public void SendComponentNetworkMessage(INetChannel? channel, IEntity entity, IComponent component, ComponentMessage message)
         {
-            if (!component.NetID.HasValue)
+            var netId = ComponentFactory.GetRegistration(component.GetType()).NetID;
+
+            if (!netId.HasValue)
                 throw new ArgumentException($"Component {component.Name} does not have a NetID.", nameof(component));
 
             var msg = _networkManager.CreateNetMessage<MsgEntity>();
             msg.Type = EntityMessageType.ComponentMessage;
             msg.EntityUid = entity.Uid;
-            msg.NetId = component.NetID.Value;
+            msg.NetId = netId.Value;
             msg.ComponentMessage = message;
             msg.SourceTick = _gameTiming.CurTick;
 
@@ -147,7 +147,11 @@ namespace Robust.Client.GameObjects
                     return;
 
                 case EntityMessageType.SystemMessage:
-                    ReceivedSystemMessage?.Invoke(this, message.SystemMessage);
+                    var msg = message.SystemMessage;
+                    var sessionType = typeof(EntitySessionMessage<>).MakeGenericType(msg.GetType());
+                    var sessionMsg = Activator.CreateInstance(sessionType, new EntitySessionEventArgs(_playerManager.LocalPlayer!.Session), msg)!;
+                    ReceivedSystemMessage?.Invoke(this, msg);
+                    ReceivedSystemMessage?.Invoke(this, sessionMsg);
                     return;
             }
         }

Robust.Client/GameObjects/Components/Appearance/AppearanceComponent.cs

@@ -10,6 +10,7 @@ using YamlDotNet.RepresentationModel;
 
 namespace Robust.Client.GameObjects
 {
+    [ComponentReference(typeof(SharedAppearanceComponent))]
     public sealed class AppearanceComponent : SharedAppearanceComponent
     {
         [ViewVariables]
@@ -103,7 +104,7 @@ namespace Robust.Client.GameObjects
             _appearanceDirty = false;
         }
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 

Robust.Client/GameObjects/Components/Eye/EyeComponent.cs

@@ -10,6 +10,7 @@ using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.GameObjects
 {
+    [ComponentReference(typeof(SharedEyeComponent))]
     public class EyeComponent : SharedEyeComponent
     {
         [Dependency] private readonly IEyeManager _eyeManager = default!;
@@ -115,7 +116,7 @@ namespace Robust.Client.GameObjects
         public MapCoordinates? Position => _eye?.Position;
 
         /// <inheritdoc />
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
@@ -155,7 +156,7 @@ namespace Robust.Client.GameObjects
             VisibilityMask = state.VisibilityMask;
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             base.OnRemove();
 

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

@@ -8,10 +8,11 @@ using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.GameObjects
 {
+    [ComponentReference(typeof(OccluderComponent))]
     internal sealed class ClientOccluderComponent : OccluderComponent
     {
         [Dependency] private readonly IMapManager _mapManager = default!;
-        
+
         [ViewVariables] private (GridId, Vector2i) _lastPosition;
         [ViewVariables] internal OccluderDir Occluding { get; private set; }
         [ViewVariables] internal uint UpdateGeneration { get; set; }
@@ -33,11 +34,11 @@ namespace Robust.Client.GameObjects
 
             if (Owner.Transform.Anchored)
             {
-                SnapGridOnPositionChanged();
+                AnchorStateChanged();
             }
         }
 
-        public void SnapGridOnPositionChanged()
+        public void AnchorStateChanged()
         {
             SendDirty();
 

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

@@ -1,9 +1,13 @@
-using System;
+using System;
+using System.Collections.Generic;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Shared.Animations;
+using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.IoC;
+using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Serialization;
@@ -14,12 +18,12 @@ namespace Robust.Client.GameObjects
 {
     [RegisterComponent]
     [ComponentReference(typeof(IPointLightComponent))]
+    [NetworkedComponent()]
     public class PointLightComponent : Component, IPointLightComponent, ISerializationHooks
     {
         [Dependency] private readonly IResourceCache _resourceCache = default!;
 
         public override string Name => "PointLight";
-        public override uint? NetID => NetIDs.POINT_LIGHT;
 
         internal bool TreeUpdateQueued { get; set; }
 
@@ -43,11 +47,29 @@ namespace Robust.Client.GameObjects
         public bool Enabled
         {
             get => _enabled;
-            set => _enabled = value;
+            set
+            {
+                if (_enabled == value) return;
+
+                _enabled = value;
+                Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new PointLightUpdateEvent());
+            }
         }
 
         [ViewVariables(VVAccess.ReadWrite)]
-        public bool ContainerOccluded { get; set; }
+        public bool ContainerOccluded
+        {
+            get => _containerOccluded;
+            set
+            {
+                if (_containerOccluded == value) return;
+
+                _containerOccluded = value;
+                Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new PointLightUpdateEvent());
+            }
+        }
+
+        private bool _containerOccluded;
 
         /// <summary>
         ///     Determines if the light mask should automatically rotate with the entity. (like a flashlight)
@@ -116,30 +138,13 @@ namespace Robust.Client.GameObjects
         public bool VisibleNested
         {
             get => _visibleNested;
-            set
-            {
-                if (_visibleNested == value) return;
-                _visibleNested = value;
-                if (value)
-                {
-                    if (Owner.Transform.Parent == null) return;
-
-                    _lightOnParent = true;
-                }
-                else
-                {
-                    if (!_lightOnParent) return;
-
-                    _lightOnParent = false;
-                }
-            }
+            set => _visibleNested = value;
         }
 
         [DataField("radius")]
         private float _radius = 5f;
         [DataField("nestedvisible")]
         private bool _visibleNested = true;
-        private bool _lightOnParent;
         [DataField("color")]
         private Color _color = Color.White;
         [DataField("offset")]
@@ -166,8 +171,10 @@ namespace Robust.Client.GameObjects
             get => _radius;
             set
             {
+                if (MathHelper.CloseTo(value, _radius)) return;
+
                 _radius = MathF.Max(value, 0.01f); // setting radius to 0 causes exceptions, so just use a value close enough to zero that it's unnoticeable.
-                Owner.EntityManager.EventBus.RaiseEvent(EventSource.Local, new PointLightRadiusChangedMessage(this));
+                Owner.EntityManager.EventBus.RaiseEvent(EventSource.Local, new PointLightRadiusChangedEvent(this));
             }
         }
 
@@ -179,6 +186,9 @@ namespace Robust.Client.GameObjects
                 Mask = null;
         }
 
+        [ViewVariables]
+        internal RenderingTreeComponent? RenderTree { get; set; }
+
         void ISerializationHooks.AfterDeserialization()
         {
             if (_maskPath != null)
@@ -187,42 +197,13 @@ namespace Robust.Client.GameObjects
             }
         }
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             UpdateMask();
         }
 
-        /// <inheritdoc />
-        public override void HandleMessage(ComponentMessage message, IComponent? component)
-        {
-            base.HandleMessage(message, component);
-
-            if (message is ParentChangedMessage msg)
-            {
-                HandleTransformParentChanged(msg);
-            }
-        }
-
-        private void HandleTransformParentChanged(ParentChangedMessage obj)
-        {
-            // TODO: this does not work for things nested multiply layers deep.
-            if (!VisibleNested)
-            {
-                return;
-            }
-
-            if (obj.NewParent != null && obj.NewParent.IsValid())
-            {
-                _lightOnParent = true;
-            }
-            else
-            {
-                _lightOnParent = false;
-            }
-        }
-
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             base.OnRemove();
 
@@ -230,7 +211,7 @@ namespace Robust.Client.GameObjects
             if (map != MapId.Nullspace)
             {
                 Owner.EntityManager.EventBus.RaiseEvent(EventSource.Local,
-                    new RenderTreeRemoveLightMessage(this, map));
+                    new RenderTreeRemoveLightEvent(this, map));
             }
         }
 
@@ -248,13 +229,18 @@ namespace Robust.Client.GameObjects
         }
     }
 
-    public struct PointLightRadiusChangedMessage
+    public class PointLightRadiusChangedEvent : EntityEventArgs
     {
         public PointLightComponent PointLightComponent { get; }
 
-        public PointLightRadiusChangedMessage(PointLightComponent pointLightComponent)
+        public PointLightRadiusChangedEvent(PointLightComponent pointLightComponent)
         {
             PointLightComponent = pointLightComponent;
         }
     }
+
+    internal sealed class PointLightUpdateEvent : EntityEventArgs
+    {
+
+    }
 }

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

@@ -27,6 +27,8 @@ using DrawDepthTag = Robust.Shared.GameObjects.DrawDepth;
 
 namespace Robust.Client.GameObjects
 {
+    [ComponentReference(typeof(SharedSpriteComponent))]
+    [ComponentReference(typeof(ISpriteComponent))]
     public sealed class SpriteComponent : SharedSpriteComponent, ISpriteComponent,
         IComponentDebug, ISerializationHooks
     {
@@ -40,7 +42,13 @@ namespace Robust.Client.GameObjects
         public override bool Visible
         {
             get => _visible;
-            set => _visible = value;
+            set
+            {
+                if (_visible == value) return;
+                _visible = value;
+
+                Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new SpriteUpdateEvent());
+            }
         }
 
         [DataField("drawdepth", customTypeSerializer: typeof(ConstantSerializer<DrawDepthTag>))]
@@ -123,6 +131,9 @@ namespace Robust.Client.GameObjects
         [DataField("directional")]
         private bool _directional = true;
 
+        [ViewVariables]
+        internal RenderingTreeComponent? RenderTree { get; set; } = null;
+
         [DataField("layerDatums")]
         private List<PrototypeLayerData> LayerDatums
         {
@@ -138,7 +149,7 @@ namespace Robust.Client.GameObjects
             }
             set
             {
-                if(value == null) return;
+                if (value == null) return;
 
                 Layers.Clear();
                 foreach (var layerDatum in value)
@@ -148,11 +159,12 @@ namespace Robust.Client.GameObjects
                     if (!string.IsNullOrWhiteSpace(layerDatum.RsiPath))
                     {
                         var path = TextureRoot / layerDatum.RsiPath;
-                        try
+
+                        if (IoCManager.Resolve<IResourceCache>().TryGetResource(path, out RSIResource? resource))
                         {
-                            layer.RSI = IoCManager.Resolve<IResourceCache>().GetResource<RSIResource>(path).RSI;
+                            layer.RSI = resource.RSI;
                         }
-                        catch
+                        else
                         {
                             Logger.ErrorS(LogCategory, "Unable to load layer RSI '{0}'.", path);
                         }
@@ -251,7 +263,7 @@ namespace Robust.Client.GameObjects
                 }
 
                 _layerMapShared = true;
-                UpdateIsInert();
+                QueueUpdateIsInert();
             }
         }
 
@@ -294,17 +306,30 @@ namespace Robust.Client.GameObjects
         }
 
         [DataField("sprite", readOnly: true)] private string? rsi;
-        [DataField("layers", readOnly: true)] private List<PrototypeLayerData> layerDatums = new ();
+        [DataField("layers", readOnly: true)] private List<PrototypeLayerData> layerDatums = new();
 
         [DataField("state", readOnly: true)] private string? state;
         [DataField("texture", readOnly: true)] private string? texture;
 
         [ViewVariables(VVAccess.ReadWrite)]
-        public bool ContainerOccluded { get; set; }
+        public bool ContainerOccluded
+        {
+            get => _containerOccluded;
+            set
+            {
+                if (_containerOccluded == value) return;
+                _containerOccluded = value;
+                Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new SpriteUpdateEvent());
+            }
+        }
+
+        private bool _containerOccluded;
 
         [ViewVariables(VVAccess.ReadWrite)]
         public bool TreeUpdateQueued { get; set; }
 
+        [ViewVariables(VVAccess.ReadWrite)] private bool _inertUpdateQueued;
+
         [ViewVariables(VVAccess.ReadWrite)]
         public ShaderInstance? PostShader { get; set; }
 
@@ -334,13 +359,13 @@ namespace Robust.Client.GameObjects
                 if (!string.IsNullOrWhiteSpace(rsi))
                 {
                     var rsiPath = TextureRoot / rsi;
-                    try
+                    if(IoCManager.Resolve<IResourceCache>().TryGetResource(rsiPath, out RSIResource? resource))
                     {
-                        BaseRSI = IoCManager.Resolve<IResourceCache>().GetResource<RSIResource>(rsiPath).RSI;
+                        BaseRSI = resource.RSI;
                     }
-                    catch (Exception e)
+                    else
                     {
-                        Logger.ErrorS(SpriteComponent.LogCategory, "Unable to load RSI '{0}'. Trace:\n{1}", rsiPath, e);
+                        Logger.ErrorS(LogCategory, "Unable to load RSI '{0}'.", rsiPath);
                     }
                 }
             }
@@ -468,7 +493,7 @@ namespace Robust.Client.GameObjects
 
         public int AddBlankLayer(int? newIndex = null)
         {
-            var layer = new Layer(this) {Visible = false};
+            var layer = new Layer(this) { Visible = false };
             return AddLayer(layer, newIndex);
         }
 
@@ -497,13 +522,13 @@ namespace Robust.Client.GameObjects
 
         public int AddLayer(Texture? texture, int? newIndex = null)
         {
-            var layer = new Layer(this) {Texture = texture};
+            var layer = new Layer(this) { Texture = texture };
             return AddLayer(layer, newIndex);
         }
 
         public int AddLayer(RSI.StateId stateId, int? newIndex = null)
         {
-            var layer = new Layer(this) {State = stateId};
+            var layer = new Layer(this) { State = stateId };
             if (BaseRSI != null && BaseRSI.TryGetState(stateId, out var state))
             {
                 layer.AnimationTimeLeft = state.GetDelay(0);
@@ -549,7 +574,7 @@ namespace Robust.Client.GameObjects
 
         public int AddLayer(RSI.StateId stateId, RSI? rsi, int? newIndex = null)
         {
-            var layer = new Layer(this) {State = stateId, RSI = rsi};
+            var layer = new Layer(this) { State = stateId, RSI = rsi };
             if (rsi != null && rsi.TryGetState(stateId, out var state))
             {
                 layer.AnimationTimeLeft = state.GetDelay(0);
@@ -605,7 +630,7 @@ namespace Robust.Client.GameObjects
                 index = Layers.Count - 1;
             }
 
-            UpdateIsInert();
+            QueueUpdateIsInert();
             return index;
         }
 
@@ -632,7 +657,7 @@ namespace Robust.Client.GameObjects
                 }
             }
 
-            UpdateIsInert();
+            QueueUpdateIsInert();
         }
 
         public void RemoveLayer(object layerKey)
@@ -1274,8 +1299,8 @@ namespace Robust.Client.GameObjects
 
             var layerColor = color * layer.Color;
 
-            var position = -(Vector2) texture.Size / (2f * EyeManager.PixelsPerMeter) + layer.Offset;
-            var textureSize = texture.Size / (float) EyeManager.PixelsPerMeter;
+            var position = -(Vector2)texture.Size / (2f * EyeManager.PixelsPerMeter) + layer.Offset;
+            var textureSize = texture.Size / (float)EyeManager.PixelsPerMeter;
             var quad = Box2.FromDimensions(position, textureSize);
 
             // TODO: Implement layer-specific rotation and scale.
@@ -1295,7 +1320,7 @@ namespace Robust.Client.GameObjects
         public static Angle CalcRectWorldAngle(Angle worldAngle, int numDirections)
         {
             var theta = worldAngle.Theta;
-            var segSize = (MathF.PI*2) / (numDirections * 2);
+            var segSize = (MathF.PI * 2) / (numDirections * 2);
             var segments = (int)(theta / segSize);
             var odd = segments % 2;
             var result = theta - (segments * segSize) - (odd * segSize);
@@ -1345,18 +1370,6 @@ namespace Robust.Client.GameObjects
             return texture;
         }
 
-        public override void OnRemove()
-        {
-            base.OnRemove();
-
-            var map = Owner.Transform.MapID;
-            if (map != MapId.Nullspace)
-            {
-                Owner.EntityManager.EventBus.RaiseEvent(EventSource.Local,
-                    new RenderTreeRemoveSpriteMessage(this, map));
-            }
-        }
-
         public void FrameUpdate(float delta)
         {
             foreach (var t in Layers)
@@ -1407,7 +1420,7 @@ namespace Robust.Client.GameObjects
             if (curState == null)
                 return;
 
-            var thestate = (SpriteComponentState) curState;
+            var thestate = (SpriteComponentState)curState;
 
             Visible = thestate.Visible;
             DrawDepth = thestate.DrawDepth;
@@ -1495,8 +1508,20 @@ namespace Robust.Client.GameObjects
             };
         }
 
-        private void UpdateIsInert()
+        private void QueueUpdateIsInert()
         {
+            if (_inertUpdateQueued)
+                return;
+
+            _inertUpdateQueued = true;
+            // Yes that null check is valid because of that stupid fucking dummy IEntity.
+            // Who thought that was a good idea.
+            Owner?.EntityManager?.EventBus?.RaiseEvent(EventSource.Local, new SpriteUpdateInertEvent {Sprite = this});
+        }
+
+        internal void DoUpdateIsInert()
+        {
+            _inertUpdateQueued = false;
             IsInert = true;
 
             foreach (var layer in Layers)
@@ -1576,9 +1601,10 @@ namespace Robust.Client.GameObjects
         {
             var builder = new StringBuilder();
             builder.AppendFormat(
-                "vis/depth/scl/rot/ofs/col/diral/dir: {0}/{1}/{2}/{3}/{4}/{5}/{6}/{7}\n",
+                "vis/depth/scl/rot/ofs/col/norot/override/dir: {0}/{1}/{2}/{3}/{4}/{5}/{6}/{8}/{7}\n",
                 Visible, DrawDepth, Scale, Rotation, Offset,
-                Color, Directional, GetDir(RSI.State.DirectionType.Dir8, Owner.Transform.WorldRotation)
+                Color, NoRotation, GetDir(RSI.State.DirectionType.Dir8, Owner.Transform.WorldRotation),
+                DirectionOverride
             );
 
             foreach (var layer in Layers)
@@ -1845,14 +1871,14 @@ namespace Robust.Client.GameObjects
             {
                 AutoAnimated = value;
 
-                _parent.UpdateIsInert();
+                _parent.QueueUpdateIsInert();
             }
 
             public void SetVisible(bool value)
             {
                 Visible = value;
 
-                _parent.UpdateIsInert();
+                _parent.QueueUpdateIsInert();
             }
 
             public void SetRsi(RSI? rsi)
@@ -1884,7 +1910,7 @@ namespace Robust.Client.GameObjects
                     }
                 }
 
-                _parent.UpdateIsInert();
+                _parent.QueueUpdateIsInert();
             }
 
             public void SetState(RSI.StateId stateId)
@@ -1916,7 +1942,7 @@ namespace Robust.Client.GameObjects
                 AnimationTime = 0;
                 AnimationTimeLeft = state.GetDelay(0);
 
-                _parent.UpdateIsInert();
+                _parent.QueueUpdateIsInert();
             }
 
             public void SetTexture(Texture? texture)
@@ -1924,7 +1950,7 @@ namespace Robust.Client.GameObjects
                 State = default;
                 Texture = texture;
 
-                _parent.UpdateIsInert();
+                _parent.QueueUpdateIsInert();
             }
 
             public void SetOffset(Vector2 offset)
@@ -1976,13 +2002,13 @@ namespace Robust.Client.GameObjects
             switch (layerProp)
             {
                 case "texture":
-                    LayerSetTexture(index, (string) value);
+                    LayerSetTexture(index, (string)value);
                     return;
                 case "state":
-                    LayerSetState(index, (string) value);
+                    LayerSetState(index, (string)value);
                     return;
                 case "color":
-                    LayerSetColor(index, (Color) value);
+                    LayerSetColor(index, (Color)value);
                     return;
                 default:
                     throw new ArgumentException($"Unknown layer property '{layerProp}'");
@@ -2027,7 +2053,7 @@ namespace Robust.Client.GameObjects
                 yield break;
             }
 
-            var dummy = new DummyIconEntity {Prototype = prototype};
+            var dummy = new DummyIconEntity { Prototype = prototype };
             var spriteComponent = dummy.AddComponent<SpriteComponent>();
 
             if (prototype.Components.TryGetValue("Appearance", out _))
@@ -2071,7 +2097,7 @@ namespace Robust.Client.GameObjects
                 return GetFallbackState(resourceCache);
             }
 
-            var dummy = new DummyIconEntity {Prototype = prototype};
+            var dummy = new DummyIconEntity { Prototype = prototype };
             var spriteComponent = dummy.AddComponent<SpriteComponent>();
             dummy.Delete();
 
@@ -2108,7 +2134,7 @@ namespace Robust.Client.GameObjects
             {
                 var typeFactory = IoCManager.Resolve<IDynamicTypeFactoryInternal>();
                 var serializationManager = IoCManager.Resolve<ISerializationManager>();
-                var comp = (T) typeFactory.CreateInstanceUnchecked(typeof(T));
+                var comp = (T)typeFactory.CreateInstanceUnchecked(typeof(T));
                 _components[typeof(T)] = comp;
                 comp.Owner = this;
 
@@ -2142,7 +2168,7 @@ namespace Robust.Client.GameObjects
 
             public T GetComponent<T>()
             {
-                return (T) _components[typeof(T)];
+                return (T)_components[typeof(T)];
             }
 
             public IComponent GetComponent(Type type)
@@ -2154,7 +2180,7 @@ namespace Robust.Client.GameObjects
             {
                 component = null;
                 if (!_components.TryGetValue(typeof(T), out var value)) return false;
-                component = (T) value;
+                component = (T)value;
                 return true;
             }
 
@@ -2176,6 +2202,10 @@ namespace Robust.Client.GameObjects
                 return null;
             }
 
+            public void QueueDelete()
+            {
+            }
+
             public void Delete()
             {
             }
@@ -2190,10 +2220,12 @@ namespace Robust.Client.GameObjects
                 return Enumerable.Empty<T>();
             }
 
+            [Obsolete("Component Messages are deprecated, use Entity Events instead.")]
             public void SendMessage(IComponent? owner, ComponentMessage message)
             {
             }
 
+            [Obsolete("Component Messages are deprecated, use Entity Events instead.")]
             public void SendNetworkMessage(IComponent owner, ComponentMessage message, INetChannel? channel = null)
             {
             }
@@ -2204,4 +2236,14 @@ namespace Robust.Client.GameObjects
         }
         #endregion
     }
+
+    internal sealed class SpriteUpdateEvent : EntityEventArgs
+    {
+
+    }
+
+    internal struct SpriteUpdateInertEvent
+    {
+        public SpriteComponent Sprite;
+    }
 }

Robust.Client/GameObjects/Components/RenderingTreeComponent.cs

@@ -0,0 +1,57 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+using Robust.Shared.Physics;
+
+namespace Robust.Client.GameObjects
+{
+    [RegisterComponent]
+    public sealed class RenderingTreeComponent : Component
+    {
+        public override string Name => "RenderingTree";
+
+        internal DynamicTree<SpriteComponent> SpriteTree { get; private set; } = new(SpriteAabbFunc);
+        internal DynamicTree<PointLightComponent> LightTree { get; private set; } = new(LightAabbFunc);
+
+        private static Box2 SpriteAabbFunc(in SpriteComponent value)
+        {
+            var worldPos = value.Owner.Transform.WorldPosition;
+            var tree = RenderingTreeSystem.GetRenderTree(value.Owner);
+
+            var pos = worldPos - tree?.Owner.Transform.WorldPosition ?? Vector2.Zero;
+
+            return new Box2(pos, pos);
+        }
+
+        private static Box2 LightAabbFunc(in PointLightComponent value)
+        {
+            var worldPos = value.Owner.Transform.WorldPosition;
+            var tree = RenderingTreeSystem.GetRenderTree(value.Owner);
+            var boxSize = value.Radius * 2;
+
+            var pos = worldPos - tree?.Owner.Transform.WorldPosition ?? Vector2.Zero;
+
+            return Box2.CenteredAround(pos, (boxSize, boxSize));
+        }
+
+        internal static Box2 SpriteAabbFunc(SpriteComponent value, Vector2? worldPos = null)
+        {
+            worldPos ??= value.Owner.Transform.WorldPosition;
+            var tree = RenderingTreeSystem.GetRenderTree(value.Owner);
+
+            var pos = worldPos - tree?.Owner.Transform.WorldPosition ?? Vector2.Zero;
+
+            return new Box2(pos, pos);
+        }
+
+        internal static Box2 LightAabbFunc(PointLightComponent value, Vector2? worldPos = null)
+        {
+            worldPos ??= value.Owner.Transform.WorldPosition;
+            var tree = RenderingTreeSystem.GetRenderTree(value.Owner);
+            var boxSize = value.Radius * 2;
+
+            var pos = worldPos - tree?.Owner.Transform.WorldPosition ?? Vector2.Zero;
+
+            return Box2.CenteredAround(pos, (boxSize, boxSize));
+        }
+    }
+}

Robust.Client/GameObjects/Components/UserInterface/ClientUserInterfaceComponent.cs

@@ -2,14 +2,14 @@
 using System.Collections.Generic;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
-using Robust.Shared.Network;
-using Robust.Shared.Players;
 using Robust.Shared.Reflection;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.GameObjects
 {
+    [ComponentReference(typeof(SharedUserInterfaceComponent))]
     public class ClientUserInterfaceComponent : SharedUserInterfaceComponent, ISerializationHooks
     {
         [Dependency] private readonly IReflectionManager _reflectionManager = default!;
@@ -23,6 +23,9 @@ namespace Robust.Client.GameObjects
         [DataField("interfaces", readOnly: true)]
         private List<PrototypeData> _interfaceData = new();
 
+        [ViewVariables]
+        public IEnumerable<BoundUserInterface> Interfaces => _openInterfaces.Values;
+
         void ISerializationHooks.AfterDeserialization()
         {
             _interfaces.Clear();
@@ -33,48 +36,40 @@ namespace Robust.Client.GameObjects
             }
         }
 
-        public override void HandleNetworkMessage(ComponentMessage message, INetChannel netChannel,
-            ICommonSession? session = null)
+        internal void MessageReceived(BoundUIWrapMessage msg)
         {
-            base.HandleNetworkMessage(message, netChannel, session);
-
-            switch (message)
+            switch (msg.Message)
             {
-                case BoundInterfaceMessageWrapMessage wrapped:
-                    // Double nested switches who needs readability anyways.
-                    switch (wrapped.Message)
+                case OpenBoundInterfaceMessage _:
+                    if (_openInterfaces.ContainsKey(msg.UiKey))
                     {
-                        case OpenBoundInterfaceMessage _:
-                            if (_openInterfaces.ContainsKey(wrapped.UiKey))
-                            {
-                                return;
-                            }
+                        return;
+                    }
 
-                            OpenInterface(wrapped);
-                            break;
+                    OpenInterface(msg);
+                    break;
 
-                        case CloseBoundInterfaceMessage _:
-                            Close(wrapped.UiKey, true);
-                            break;
+                case CloseBoundInterfaceMessage _:
+                    Close(msg.UiKey, true);
+                    break;
 
-                        default:
-                            if (_openInterfaces.TryGetValue(wrapped.UiKey, out var bi))
-                            {
-                                bi.InternalReceiveMessage(wrapped.Message);
-                            }
-                            break;
+                default:
+                    if (_openInterfaces.TryGetValue(msg.UiKey, out var bi))
+                    {
+                        bi.InternalReceiveMessage(msg.Message);
                     }
 
                     break;
             }
         }
 
-        private void OpenInterface(BoundInterfaceMessageWrapMessage wrapped)
+        private void OpenInterface(BoundUIWrapMessage wrapped)
         {
             var data = _interfaces[wrapped.UiKey];
             // TODO: This type should be cached, but I'm too lazy.
             var type = _reflectionManager.LooseGetType(data.ClientType);
-            var boundInterface = (BoundUserInterface) _dynamicTypeFactory.CreateInstance(type, new[]{this, wrapped.UiKey});
+            var boundInterface =
+                (BoundUserInterface) _dynamicTypeFactory.CreateInstance(type, new[] {this, wrapped.UiKey});
             boundInterface.Open();
             _openInterfaces[wrapped.UiKey] = boundInterface;
         }
@@ -86,7 +81,7 @@ namespace Robust.Client.GameObjects
                 return;
             }
 
-            if(!remoteCall)
+            if (!remoteCall)
                 SendMessage(new CloseBoundInterfaceMessage(), uiKey);
             _openInterfaces.Remove(uiKey);
             boundUserInterface.Dispose();
@@ -94,7 +89,8 @@ namespace Robust.Client.GameObjects
 
         internal void SendMessage(BoundUserInterfaceMessage message, object uiKey)
         {
-            SendNetworkMessage(new BoundInterfaceMessageWrapMessage(message, uiKey));
+            EntitySystem.Get<UserInterfaceSystem>()
+                .Send(new BoundUIWrapMessage(Owner.Uid, message, uiKey));
         }
     }
 

Robust.Client/GameObjects/EntitySystems/AudioSystem.cs

@@ -41,17 +41,6 @@ namespace Robust.Client.GameObjects
             _broadPhaseSystem = Get<SharedBroadPhaseSystem>();
         }
 
-        public override void Shutdown()
-        {
-            base.Shutdown();
-            UnsubscribeNetworkEvent<PlayAudioEntityMessage>();
-            UnsubscribeNetworkEvent<PlayAudioGlobalMessage>();
-            UnsubscribeNetworkEvent<PlayAudioPositionalMessage>();
-            UnsubscribeNetworkEvent<StopAudioMessageClient>();
-
-            UnsubscribeLocalEvent<SoundSystem.QueryAudioSystem>();
-        }
-
         private void StopAudioMessageHandler(StopAudioMessageClient ev)
         {
             var stream = _playingClydeStreams.Find(p => p.NetIdentifier == ev.Identifier);
@@ -265,7 +254,7 @@ namespace Robust.Client.GameObjects
             if (!source.SetPosition(entity.Transform.WorldPosition))
             {
                 source.Dispose();
-                Logger.Warning("Can't play positional audio, can't set position.");
+                Logger.Warning($"Can't play positional audio \"{stream.Name}\", can't set position.");
                 return null;
             }
 
@@ -312,7 +301,7 @@ namespace Robust.Client.GameObjects
             if (!source.SetPosition(coordinates.ToMapPos(EntityManager)))
             {
                 source.Dispose();
-                Logger.Warning("Can't play positional audio, can't set position.");
+                Logger.Warning($"Can't play positional audio \"{stream.Name}\", can't set position.");
                 return null;
             }
 

Robust.Client/GameObjects/EntitySystems/ClientOccluderSystem.cs

@@ -35,16 +35,7 @@ namespace Robust.Client.GameObjects
 
             SubscribeLocalEvent<OccluderDirtyEvent>(HandleDirtyEvent);
 
-            SubscribeLocalEvent<ClientOccluderComponent, SnapGridPositionChangedEvent>(HandleSnapGridMove);
-        }
-
-        /// <inheritdoc />
-        public override void Shutdown()
-        {
-            UnsubscribeLocalEvent<OccluderDirtyEvent>();
-            UnsubscribeLocalEvent<ClientOccluderComponent, SnapGridPositionChangedEvent>();
-
-            base.Shutdown();
+            SubscribeLocalEvent<ClientOccluderComponent, AnchorStateChangedEvent>(HandleAnchorChanged);
         }
 
         public override void FrameUpdate(float frameTime)
@@ -71,9 +62,9 @@ namespace Robust.Client.GameObjects
             }
         }
 
-        private static void HandleSnapGridMove(EntityUid uid, ClientOccluderComponent component, SnapGridPositionChangedEvent args)
+        private static void HandleAnchorChanged(EntityUid uid, ClientOccluderComponent component, AnchorStateChangedEvent args)
         {
-            component.SnapGridOnPositionChanged();
+            component.AnchorStateChanged();
         }
 
         private void HandleDirtyEvent(OccluderDirtyEvent ev)

Robust.Client/GameObjects/EntitySystems/DebugGridTileLookupSystem.cs

@@ -0,0 +1,134 @@
+#if DEBUG
+using System;
+using System.Text;
+using Robust.Client.Graphics;
+using Robust.Client.Input;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.GameObjects
+{
+    internal sealed class DebugGridTileLookupSystem : EntitySystem
+    {
+        [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IInputManager _inputManager = default!;
+        [Dependency] private readonly IMapManager _mapManager = default!;
+
+        public bool Enabled
+        {
+            get => _enabled;
+            set
+            {
+                if (_enabled == value) return;
+                _enabled = value;
+
+                if (_enabled)
+                {
+                    _label.Visible = true;
+                    LastTile = default;
+                }
+                else
+                {
+                    _label.Text = null;
+                    _label.Visible = false;
+                }
+            }
+        }
+
+        private bool _enabled;
+
+        private (GridId Grid, Vector2i Indices) LastTile;
+
+        // Label and shit that follows cursor
+        private Label _label = new()
+        {
+            Visible = false,
+        };
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeNetworkEvent<SendGridTileLookupMessage>(HandleSentEntities);
+            IoCManager.Resolve<IUserInterfaceManager>().StateRoot.AddChild(_label);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            UnsubscribeNetworkEvent<SendGridTileLookupMessage>();
+            IoCManager.Resolve<IUserInterfaceManager>().StateRoot.RemoveChild(_label);
+        }
+
+        private void RequestEntities(GridId gridId, Vector2i indices)
+        {
+            if (gridId == GridId.Invalid) return;
+            RaiseNetworkEvent(new RequestGridTileLookupMessage(gridId, indices));
+        }
+
+        private void HandleSentEntities(SendGridTileLookupMessage message)
+        {
+            if (!Enabled) return;
+            var text = new StringBuilder();
+            text.AppendLine($"GridId: {LastTile.Grid}, Tile: {LastTile.Indices}");
+
+            for (var i = 0; i < message.Entities.Count; i++)
+            {
+                var uid = message.Entities[i];
+
+                if (!EntityManager.TryGetEntity(uid, out var entity)) continue;
+
+                text.AppendLine(entity.ToString());
+            }
+
+            _label.Text = text.ToString();
+        }
+
+        public override void FrameUpdate(float frameTime)
+        {
+            base.FrameUpdate(frameTime);
+            if (!Enabled) return;
+
+            var mousePos = _inputManager.MouseScreenPosition;
+            var worldPos = _eyeManager.ScreenToMap(mousePos);
+
+            GridId gridId;
+            Vector2i tile;
+
+            if (_mapManager.TryFindGridAt(worldPos, out var grid))
+            {
+                gridId = grid.Index;
+                tile = grid.WorldToTile(worldPos.Position);
+            }
+            else
+            {
+                gridId = GridId.Invalid;
+                tile = new Vector2i((int) MathF.Floor(worldPos.Position.X), (int) MathF.Floor(worldPos.Position.Y));
+            }
+
+            LayoutContainer.SetPosition(_label, mousePos.Position);
+
+            if ((gridId, tile).Equals(LastTile)) return;
+
+            _label.Text = null;
+            LastTile = (gridId, tile);
+            RequestEntities(gridId, tile);
+        }
+    }
+
+    internal sealed class RequestTileEntities : IConsoleCommand
+    {
+        public string Command => "tilelookup";
+        public string Description => "Used for debugging GridTileLookupSystem";
+        public string Help => $"{Command}";
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            EntitySystem.Get<DebugGridTileLookupSystem>().Enabled ^= true;
+        }
+    }
+}
+#endif

Robust.Client/GameObjects/EntitySystems/DebugLightTreeSystem.cs

@@ -0,0 +1,84 @@
+#if DEBUG
+using Robust.Client.Graphics;
+using Robust.Shared.Enums;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.GameObjects
+{
+    internal sealed class DebugLightTreeSystem : EntitySystem
+    {
+        private DebugLightOverlay? _lightOverlay;
+
+        public bool Enabled
+        {
+            get => _enabled;
+            set
+            {
+                if (_enabled == value) return;
+
+                _enabled = value;
+                var overlayManager = IoCManager.Resolve<IOverlayManager>();
+
+                if (_enabled)
+                {
+                    _lightOverlay = new DebugLightOverlay(
+                        IoCManager.Resolve<IEntityLookup>(),
+                        IoCManager.Resolve<IEyeManager>(),
+                        IoCManager.Resolve<IMapManager>(),
+                        Get<RenderingTreeSystem>());
+
+                    overlayManager.AddOverlay(_lightOverlay);
+                }
+                else
+                {
+                    overlayManager.RemoveOverlay(_lightOverlay!);
+                    _lightOverlay = null;
+                }
+            }
+        }
+
+        private bool _enabled;
+
+        private sealed class DebugLightOverlay : Overlay
+        {
+            private IEntityLookup _lookup;
+            private IEyeManager _eyeManager;
+            private IMapManager _mapManager;
+
+            private RenderingTreeSystem _tree;
+
+            public override OverlaySpace Space => OverlaySpace.WorldSpace;
+
+            public DebugLightOverlay(IEntityLookup lookup, IEyeManager eyeManager, IMapManager mapManager, RenderingTreeSystem tree)
+            {
+                _lookup = lookup;
+                _eyeManager = eyeManager;
+                _mapManager = mapManager;
+                _tree = tree;
+            }
+
+            protected internal override void Draw(in OverlayDrawArgs args)
+            {
+                var map = _eyeManager.CurrentMap;
+                if (map == MapId.Nullspace) return;
+
+                var viewport = _eyeManager.GetWorldViewport();
+
+                foreach (var tree in _tree.GetLightTrees(map, viewport))
+                {
+                    foreach (var light in tree)
+                    {
+                        var aabb = _lookup.GetWorldAabbFromEntity(light.Owner);
+                        if (!aabb.Intersects(viewport)) continue;
+
+                        args.WorldHandle.DrawRect(aabb, Color.Green.WithAlpha(0.1f));
+                    }
+                }
+            }
+        }
+    }
+}
+#endif

Robust.Client/GameObjects/EntitySystems/EffectSystem.cs

@@ -67,9 +67,10 @@ namespace Robust.Client.GameObjects
             //Create effect from creation message
             var effect = new Effect(message, resourceCache, _mapManager, _entityManager);
             effect.Deathtime = gameTiming.CurTime + message.LifeTime;
-            if (effect.AttachedEntityUid != null)
+            if (effect.AttachedEntityUid != null
+                && _entityManager.TryGetEntity(effect.AttachedEntityUid.Value, out var attachedEntity))
             {
-                effect.AttachedEntity = _entityManager.GetEntity(effect.AttachedEntityUid.Value);
+                effect.AttachedEntity = attachedEntity;
             }
 
             _Effects.Add(effect);

Robust.Client/GameObjects/EntitySystems/InputSystem.cs

@@ -173,4 +173,24 @@ namespace Robust.Client.GameObjects
             AttachedEntity = attachedEntity;
         }
     }
+
+    public class PlayerAttachedEvent : EntityEventArgs
+    {
+        public PlayerAttachedEvent(IEntity entity)
+        {
+            Entity = entity;
+        }
+
+        public IEntity Entity { get; }
+    }
+
+    public class PlayerDetachedEvent : EntityEventArgs
+    {
+        public PlayerDetachedEvent(IEntity entity)
+        {
+            Entity = entity;
+        }
+
+        public IEntity Entity { get; }
+    }
 }

Robust.Client/GameObjects/EntitySystems/RenderingTreeSystem.cs

@@ -1,11 +1,17 @@
 using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
 using JetBrains.Annotations;
 using Robust.Client.Physics;
+using Robust.Shared;
+using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Physics;
+using Robust.Shared.Utility;
 
 namespace Robust.Client.GameObjects
 {
@@ -15,23 +21,48 @@ namespace Robust.Client.GameObjects
     [UsedImplicitly]
     public sealed class RenderingTreeSystem : EntitySystem
     {
+        internal const string LoggerSawmill = "rendertree";
+
         // Nullspace is not indexed. Keep that in mind.
 
-        [Dependency] private readonly IMapManagerInternal _mapManager = default!;
-
-        private readonly Dictionary<MapId, Dictionary<GridId, MapTrees>> _gridTrees = new();
+        [Dependency] private readonly IMapManager _mapManager = default!;
 
         private readonly List<SpriteComponent> _spriteQueue = new();
         private readonly List<PointLightComponent> _lightQueue = new();
 
-        internal DynamicTree<SpriteComponent> GetSpriteTreeForMap(MapId map, GridId grid)
+        private HashSet<EntityUid> _checkedChildren = new();
+
+        /// <summary>
+        /// <see cref="CVars.MaxLightRadius"/>
+        /// </summary>
+        public float MaxLightRadius { get; private set; }
+
+        internal IEnumerable<RenderingTreeComponent> GetRenderTrees(MapId mapId, Box2 worldAABB)
         {
-            return _gridTrees[map][grid].SpriteTree;
+            if (mapId == MapId.Nullspace) yield break;
+
+            foreach (var grid in _mapManager.FindGridsIntersecting(mapId, worldAABB))
+            {
+                yield return EntityManager.GetEntity(grid.GridEntityId).GetComponent<RenderingTreeComponent>();
+            }
+
+            yield return _mapManager.GetMapEntity(mapId).GetComponent<RenderingTreeComponent>();
         }
 
-        internal DynamicTree<PointLightComponent> GetLightTreeForMap(MapId map, GridId grid)
+        internal IEnumerable<DynamicTree<SpriteComponent>> GetSpriteTrees(MapId mapId, Box2 worldAABB)
         {
-            return _gridTrees[map][grid].LightTree;
+            foreach (var comp in GetRenderTrees(mapId, worldAABB))
+            {
+                yield return comp.SpriteTree;
+            }
+        }
+
+        internal IEnumerable<DynamicTree<PointLightComponent>> GetLightTrees(MapId mapId, Box2 worldAABB)
+        {
+            foreach (var comp in GetRenderTrees(mapId, worldAABB))
+            {
+                yield return comp.LightTree;
+            }
         }
 
         public override void Initialize()
@@ -43,156 +74,164 @@ namespace Robust.Client.GameObjects
             UpdatesAfter.Add(typeof(PhysicsSystem));
 
             _mapManager.MapCreated += MapManagerOnMapCreated;
-            _mapManager.MapDestroyed += MapManagerOnMapDestroyed;
             _mapManager.OnGridCreated += MapManagerOnGridCreated;
-            _mapManager.OnGridRemoved += MapManagerOnGridRemoved;
 
-            SubscribeLocalEvent<EntMapIdChangedMessage>(EntMapIdChanged);
-            SubscribeLocalEvent<MoveEvent>(EntMoved);
-            SubscribeLocalEvent<EntParentChangedMessage>(EntParentChanged);
-            SubscribeLocalEvent<PointLightRadiusChangedMessage>(PointLightRadiusChanged);
-            SubscribeLocalEvent<RenderTreeRemoveSpriteMessage>(RemoveSprite);
-            SubscribeLocalEvent<RenderTreeRemoveLightMessage>(RemoveLight);
+            // Due to how recursion works, this must be done.
+            SubscribeLocalEvent<MoveEvent>(AnythingMoved);
+
+            SubscribeLocalEvent<SpriteComponent, EntMapIdChangedMessage>(SpriteMapChanged);
+            SubscribeLocalEvent<SpriteComponent, EntParentChangedMessage>(SpriteParentChanged);
+            SubscribeLocalEvent<SpriteComponent, ComponentRemove>(RemoveSprite);
+            SubscribeLocalEvent<SpriteComponent, SpriteUpdateEvent>(HandleSpriteUpdate);
+
+            SubscribeLocalEvent<PointLightComponent, EntMapIdChangedMessage>(LightMapChanged);
+            SubscribeLocalEvent<PointLightComponent, EntParentChangedMessage>(LightParentChanged);
+            SubscribeLocalEvent<PointLightComponent, PointLightRadiusChangedEvent>(PointLightRadiusChanged);
+            SubscribeLocalEvent<PointLightComponent, RenderTreeRemoveLightEvent>(RemoveLight);
+            SubscribeLocalEvent<PointLightComponent, PointLightUpdateEvent>(HandleLightUpdate);
+
+            SubscribeLocalEvent<RenderingTreeComponent, ComponentRemove>(HandleTreeRemove);
+
+            var configManager = IoCManager.Resolve<IConfigurationManager>();
+            configManager.OnValueChanged(CVars.MaxLightRadius, value => MaxLightRadius = value, true);
         }
 
+        private void HandleLightUpdate(EntityUid uid, PointLightComponent component, PointLightUpdateEvent args)
+        {
+            if (component.TreeUpdateQueued) return;
+            QueueLightUpdate(component);
+        }
+
+        private void HandleSpriteUpdate(EntityUid uid, SpriteComponent component, SpriteUpdateEvent args)
+        {
+            if (component.TreeUpdateQueued) return;
+            QueueSpriteUpdate(component);
+        }
+
+        private void AnythingMoved(MoveEvent args)
+        {
+            AnythingMovedSubHandler(args.Sender.Transform);
+        }
+
+        private void AnythingMovedSubHandler(ITransformComponent sender)
+        {
+            // To avoid doing redundant updates (and we don't need to update a grid's children ever)
+            if (!_checkedChildren.Add(sender.Owner.Uid) ||
+                sender.Owner.HasComponent<RenderingTreeComponent>()) return;
+
+            // This recursive search is needed, as MoveEvent is defined to not care about indirect events like children.
+            // 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 (sender.Owner.TryGetComponent(out SpriteComponent? sprite))
+                QueueSpriteUpdate(sprite);
+
+            if (sender.Owner.TryGetComponent(out PointLightComponent? light))
+                QueueLightUpdate(light);
+
+            foreach (ITransformComponent child in sender.Children)
+            {
+                AnythingMovedSubHandler(child);
+            }
+        }
+
+        // For the RemoveX methods
+        // If the Transform is removed BEFORE the Sprite/Light,
+        // then the MapIdChanged code will handle and remove it (because MapId gets set to nullspace).
+        // Otherwise these will still have their past MapId and that's all we need..
+
+        #region SpriteHandlers
+        private void SpriteMapChanged(EntityUid uid, SpriteComponent component, EntMapIdChangedMessage args)
+        {
+            QueueSpriteUpdate(component);
+        }
+
+        private void SpriteParentChanged(EntityUid uid, SpriteComponent component, EntParentChangedMessage args)
+        {
+            QueueSpriteUpdate(component);
+        }
+
+        private void RemoveSprite(EntityUid uid, SpriteComponent component, ComponentRemove args)
+        {
+            ClearSprite(component);
+        }
+
+        private void ClearSprite(SpriteComponent component)
+        {
+            if (component.RenderTree == null) return;
+
+            component.RenderTree.SpriteTree.Remove(component);
+            component.RenderTree = null;
+        }
+
+        private void QueueSpriteUpdate(SpriteComponent component)
+        {
+            if (component.TreeUpdateQueued) return;
+
+            component.TreeUpdateQueued = true;
+            _spriteQueue.Add(component);
+        }
+        #endregion
+
+        #region LightHandlers
+        private void LightMapChanged(EntityUid uid, PointLightComponent component, EntMapIdChangedMessage args)
+        {
+            QueueLightUpdate(component);
+        }
+
+        private void LightParentChanged(EntityUid uid, PointLightComponent component, EntParentChangedMessage args)
+        {
+            QueueLightUpdate(component);
+        }
+
+        private void PointLightRadiusChanged(EntityUid uid, PointLightComponent component, PointLightRadiusChangedEvent args)
+        {
+            QueueLightUpdate(component);
+        }
+
+        private void RemoveLight(EntityUid uid, PointLightComponent component, RenderTreeRemoveLightEvent args)
+        {
+            ClearLight(component);
+        }
+
+        private void ClearLight(PointLightComponent component)
+        {
+            if (component.RenderTree == null) return;
+
+            component.RenderTree.LightTree.Remove(component);
+            component.RenderTree = null;
+        }
+
+        private void QueueLightUpdate(PointLightComponent component)
+        {
+            if (component.TreeUpdateQueued) return;
+
+            component.TreeUpdateQueued = true;
+            _lightQueue.Add(component);
+        }
+        #endregion
+
         public override void Shutdown()
         {
             base.Shutdown();
             _mapManager.MapCreated -= MapManagerOnMapCreated;
-            _mapManager.MapDestroyed -= MapManagerOnMapDestroyed;
             _mapManager.OnGridCreated -= MapManagerOnGridCreated;
-            _mapManager.OnGridRemoved -= MapManagerOnGridRemoved;
-
-            UnsubscribeLocalEvent<EntMapIdChangedMessage>();
-            UnsubscribeLocalEvent<MoveEvent>();
-            UnsubscribeLocalEvent<EntParentChangedMessage>();
-            UnsubscribeLocalEvent<PointLightRadiusChangedMessage>();
-            UnsubscribeLocalEvent<RenderTreeRemoveSpriteMessage>();
-            UnsubscribeLocalEvent<RenderTreeRemoveLightMessage>();
         }
 
-        // For these next 2 methods (the Remove* ones):
-        // If the Transform is removed BEFORE the Sprite/Light,
-        // then the MapIdChanged code will handle and remove it (because MapId gets set to nullspace).
-        // Otherwise these will still have their past MapId and that's all we need..
-        private void RemoveLight(RenderTreeRemoveLightMessage ev)
+        private void HandleTreeRemove(EntityUid uid, RenderingTreeComponent component, ComponentRemove args)
         {
-            foreach (var gridId in _mapManager.FindGridIdsIntersecting(ev.Map, MapTrees.LightAabbFunc(ev.Light), true))
+            foreach (var sprite in component.SpriteTree)
             {
-                _gridTrees[ev.Map][gridId].LightTree.Remove(ev.Light);
-            }
-        }
-
-        private void RemoveSprite(RenderTreeRemoveSpriteMessage ev)
-        {
-            foreach (var gridId in _mapManager.FindGridIdsIntersecting(ev.Map, MapTrees.SpriteAabbFunc(ev.Sprite), true))
-            {
-                _gridTrees[ev.Map][gridId].SpriteTree.Remove(ev.Sprite);
-            }
-        }
-
-        private void PointLightRadiusChanged(PointLightRadiusChangedMessage ev)
-        {
-            QueueUpdateLight(ev.PointLightComponent);
-        }
-
-        private void EntParentChanged(EntParentChangedMessage ev)
-        {
-            UpdateEntity(ev.Entity);
-        }
-
-        private void EntMoved(MoveEvent ev)
-        {
-            UpdateEntity(ev.Sender);
-        }
-
-        private void UpdateEntity(IEntity entity)
-        {
-            if (entity.TryGetComponent(out SpriteComponent? spriteComponent))
-            {
-                if (!spriteComponent.TreeUpdateQueued)
-                {
-                    spriteComponent.TreeUpdateQueued = true;
-
-                    _spriteQueue.Add(spriteComponent);
-                }
+                sprite.RenderTree = null;
             }
 
-            if (entity.TryGetComponent(out PointLightComponent? light))
+            foreach (var light in component.LightTree)
             {
-                QueueUpdateLight(light);
+                light.RenderTree = null;
             }
 
-            foreach (var child in entity.Transform.ChildEntityUids)
-            {
-                UpdateEntity(EntityManager.GetEntity(child));
-            }
-        }
-
-        private void QueueUpdateLight(PointLightComponent light)
-        {
-            if (!light.TreeUpdateQueued)
-            {
-                light.TreeUpdateQueued = true;
-
-                _lightQueue.Add(light);
-            }
-        }
-
-        private void EntMapIdChanged(EntMapIdChangedMessage ev)
-        {
-            // Nullspace is a valid map ID for stuff to have but we also aren't gonna bother indexing it.
-            // So that's why there's a GetValueOrDefault.
-            var oldMapTrees = _gridTrees.GetValueOrDefault(ev.OldMapId);
-            var newMapTrees = _gridTrees.GetValueOrDefault(ev.Entity.Transform.MapID);
-
-            // TODO: MMMM probably a better way to do this.
-            if (ev.Entity.TryGetComponent(out SpriteComponent? sprite))
-            {
-                if (oldMapTrees != null)
-                {
-                    foreach (var (_, gridTree) in oldMapTrees)
-                    {
-                        gridTree.SpriteTree.Remove(sprite);
-                    }
-                }
-
-                var bounds = MapTrees.SpriteAabbFunc(sprite);
-
-                foreach (var gridId in _mapManager.FindGridIdsIntersecting(ev.Entity.Transform.MapID, bounds, true))
-                {
-                    var gridBounds = gridId == GridId.Invalid
-                        ? bounds : bounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
-
-                    newMapTrees?[gridId].SpriteTree.AddOrUpdate(sprite, gridBounds);
-                }
-            }
-
-            if (ev.Entity.TryGetComponent(out PointLightComponent? light))
-            {
-                if (oldMapTrees != null)
-                {
-                    foreach (var (_, gridTree) in oldMapTrees)
-                    {
-                        gridTree.LightTree.Remove(light);
-                    }
-                }
-
-                var bounds = MapTrees.LightAabbFunc(light);
-
-                foreach (var gridId in _mapManager.FindGridIdsIntersecting(ev.Entity.Transform.MapID, bounds, true))
-                {
-                    var gridBounds = gridId == GridId.Invalid
-                        ? bounds : bounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
-
-                    newMapTrees?[gridId].LightTree.AddOrUpdate(light, gridBounds);
-                }
-            }
-        }
-
-        private void MapManagerOnMapDestroyed(object? sender, MapEventArgs e)
-        {
-            _gridTrees.Remove(e.Map);
+            component.SpriteTree.Clear();
+            component.LightTree.Clear();
         }
 
         private void MapManagerOnMapCreated(object? sender, MapEventArgs e)
@@ -202,109 +241,125 @@ namespace Robust.Client.GameObjects
                 return;
             }
 
-            _gridTrees.Add(e.Map, new Dictionary<GridId, MapTrees>
-            {
-                {GridId.Invalid, new MapTrees()}
-            });
+            _mapManager.GetMapEntity(e.Map).EnsureComponent<RenderingTreeComponent>();
         }
 
         private void MapManagerOnGridCreated(MapId mapId, GridId gridId)
         {
-            _gridTrees[mapId].Add(gridId, new MapTrees());
+            EntityManager.GetEntity(_mapManager.GetGrid(gridId).GridEntityId).EnsureComponent<RenderingTreeComponent>();
         }
 
-        private void MapManagerOnGridRemoved(MapId mapId, GridId gridId)
+        internal static RenderingTreeComponent? GetRenderTree(IEntity entity)
         {
-            _gridTrees[mapId].Remove(gridId);
+            if (entity.Transform.MapID == MapId.Nullspace ||
+                entity.HasComponent<RenderingTreeComponent>()) return null;
+
+            var parent = entity.Transform.Parent?.Owner;
+
+            while (true)
+            {
+                if (parent == null) break;
+
+                if (parent.TryGetComponent(out RenderingTreeComponent? comp)) return comp;
+                parent = parent.Transform.Parent?.Owner;
+            }
+
+            return null;
         }
 
         public override void FrameUpdate(float frameTime)
         {
-            foreach (var queuedUpdateSprite in _spriteQueue)
+            _checkedChildren.Clear();
+
+            foreach (var sprite in _spriteQueue)
             {
-                var map = queuedUpdateSprite.Owner.Transform.MapID;
-                if (map == MapId.Nullspace)
+                sprite.TreeUpdateQueued = false;
+                if (!sprite.Visible || sprite.ContainerOccluded)
                 {
+                    ClearSprite(sprite);
                     continue;
                 }
 
-                var mapTree = _gridTrees[map];
+                var oldMapTree = sprite.RenderTree;
+                var newMapTree = GetRenderTree(sprite.Owner);
+                // TODO: Temp PVS guard
+                var worldPos = sprite.Owner.Transform.WorldPosition;
 
-                foreach (var gridId in _mapManager.FindGridIdsIntersecting(map,
-                    MapTrees.SpriteAabbFunc(queuedUpdateSprite), true))
+                if (float.IsNaN(worldPos.X) || float.IsNaN(worldPos.Y))
                 {
-                    mapTree[gridId].SpriteTree.AddOrUpdate(queuedUpdateSprite);
+                    ClearSprite(sprite);
+                    continue;
                 }
 
-                queuedUpdateSprite.TreeUpdateQueued = false;
+                var aabb = RenderingTreeComponent.SpriteAabbFunc(sprite, worldPos);
+
+                // If we're on a new map then clear the old one.
+                if (oldMapTree != newMapTree)
+                {
+                    ClearSprite(sprite);
+                    newMapTree?.SpriteTree.Add(sprite, aabb);
+                }
+                else
+                {
+                    newMapTree?.SpriteTree.Update(sprite, aabb);
+                }
+
+                sprite.RenderTree = newMapTree;
             }
 
-            foreach (var queuedUpdateLight in _lightQueue)
+            foreach (var light in _lightQueue)
             {
-                var map = queuedUpdateLight.Owner.Transform.MapID;
-                if (map == MapId.Nullspace)
+                light.TreeUpdateQueued = false;
+
+                if (!light.Enabled || light.ContainerOccluded)
                 {
+                    ClearLight(light);
                     continue;
                 }
 
-                var mapTree = _gridTrees[map];
+                var oldMapTree = light.RenderTree;
+                var newMapTree = GetRenderTree(light.Owner);
+                // TODO: Temp PVS guard
+                var worldPos = light.Owner.Transform.WorldPosition;
 
-                foreach (var gridId in _mapManager.FindGridIdsIntersecting(map,
-                    MapTrees.LightAabbFunc(queuedUpdateLight), true))
+                if (float.IsNaN(worldPos.X) || float.IsNaN(worldPos.Y))
                 {
-                    mapTree[gridId].LightTree.AddOrUpdate(queuedUpdateLight);
+                    ClearLight(light);
+                    continue;
                 }
 
-                queuedUpdateLight.TreeUpdateQueued = false;
+                // TODO: Events need a bit of cleanup so we only validate this on initialize and radius changed events
+                // this is fine for now IMO as it's 1 float check for every light that moves
+                if (light.Radius > MaxLightRadius)
+                {
+                    Logger.WarningS(LoggerSawmill, $"Light radius for {light.Owner} set above max radius of {MaxLightRadius}. This may lead to pop-in.");
+                }
+
+                var treePos = newMapTree?.Owner.Transform.WorldPosition ?? Vector2.Zero;
+                var aabb = RenderingTreeComponent.LightAabbFunc(light, worldPos);
+
+                // If we're on a new map then clear the old one.
+                if (oldMapTree != newMapTree)
+                {
+                    ClearLight(light);
+                    newMapTree?.LightTree.Add(light, aabb);
+                }
+                else
+                {
+                    newMapTree?.LightTree.Update(light, aabb);
+                }
+
+                light.RenderTree = newMapTree;
             }
 
             _spriteQueue.Clear();
             _lightQueue.Clear();
         }
-
-        private sealed class MapTrees
-        {
-            public readonly DynamicTree<SpriteComponent> SpriteTree;
-            public readonly DynamicTree<PointLightComponent> LightTree;
-
-            public MapTrees()
-            {
-                SpriteTree = new DynamicTree<SpriteComponent>(SpriteAabbFunc);
-                LightTree = new DynamicTree<PointLightComponent>(LightAabbFunc);
-            }
-
-            internal static Box2 SpriteAabbFunc(in SpriteComponent value)
-            {
-                var worldPos = value.Owner.Transform.WorldPosition;
-
-                return new Box2(worldPos, worldPos);
-            }
-
-            internal static Box2 LightAabbFunc(in PointLightComponent value)
-            {
-                var worldPos = value.Owner.Transform.WorldPosition;
-
-                var boxSize = value.Radius * 2;
-                return Box2.CenteredAround(worldPos, (boxSize, boxSize));
-            }
-        }
     }
 
-    internal struct RenderTreeRemoveSpriteMessage
+    internal class RenderTreeRemoveLightEvent : EntityEventArgs
     {
-        public RenderTreeRemoveSpriteMessage(SpriteComponent sprite, MapId map)
-        {
-            Sprite = sprite;
-            Map = map;
-        }
-
-        public SpriteComponent Sprite { get; }
-        public MapId Map { get; }
-    }
-
-    internal struct RenderTreeRemoveLightMessage
-    {
-        public RenderTreeRemoveLightMessage(PointLightComponent light, MapId map)
+        public RenderTreeRemoveLightEvent(PointLightComponent light, MapId map)
         {
             Light = light;
             Map = map;

Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

@@ -1,9 +1,9 @@
-using JetBrains.Annotations;
+using System.Collections.Generic;
+using JetBrains.Annotations;
 using Robust.Client.Graphics;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
-using Robust.Shared.Maths;
 
 namespace Robust.Client.GameObjects
 {
@@ -16,10 +16,29 @@ namespace Robust.Client.GameObjects
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly IMapManager _mapManager = default!;
 
+        private RenderingTreeSystem _treeSystem = default!;
+        private readonly Queue<SpriteComponent> _inertUpdateQueue = new();
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            _treeSystem = Get<RenderingTreeSystem>();
+            SubscribeLocalEvent<SpriteUpdateInertEvent>(QueueUpdateInert);
+        }
+
+        private void QueueUpdateInert(SpriteUpdateInertEvent ev)
+        {
+            _inertUpdateQueue.Enqueue(ev.Sprite);
+        }
+
         /// <inheritdoc />
         public override void FrameUpdate(float frameTime)
         {
-            var renderTreeSystem = EntitySystemManager.GetEntitySystem<RenderingTreeSystem>();
+            while (_inertUpdateQueue.TryDequeue(out var sprite))
+            {
+                sprite.DoUpdateIsInert();
+            }
 
             // So we could calculate the correct size of the entities based on the contents of their sprite...
             // Or we can just assume that no entity is larger than 10x10 and get a stupid easy check.
@@ -31,22 +50,11 @@ namespace Robust.Client.GameObjects
                 return;
             }
 
-            foreach (var gridId in _mapManager.FindGridIdsIntersecting(currentMap, pvsBounds, true))
+            foreach (var comp in _treeSystem.GetRenderTrees(currentMap, pvsBounds))
             {
-                Box2 gridBounds;
+                var bounds = pvsBounds.Translated(-comp.Owner.Transform.WorldPosition);
 
-                if (gridId == GridId.Invalid)
-                {
-                    gridBounds = pvsBounds;
-                }
-                else
-                {
-                    gridBounds = pvsBounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
-                }
-
-                var mapTree = renderTreeSystem.GetSpriteTreeForMap(currentMap, gridId);
-
-                mapTree.QueryAabb(ref frameTime, (ref float state, in SpriteComponent value) =>
+                comp.SpriteTree.QueryAabb(ref frameTime, (ref float state, in SpriteComponent value) =>
                 {
                     if (value.IsInert)
                     {
@@ -55,7 +63,7 @@ namespace Robust.Client.GameObjects
 
                     value.FrameUpdate(state);
                     return true;
-                }, gridBounds, approx: true);
+                }, bounds, true);
             }
         }
     }

Robust.Client/GameObjects/EntitySystems/UserInterfaceSystem.cs

@@ -0,0 +1,37 @@
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Client.GameObjects
+{
+    [UsedImplicitly]
+    public sealed class UserInterfaceSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeNetworkEvent<BoundUIWrapMessage>(MessageReceived);
+            SubscribeLocalEvent<ClientUserInterfaceComponent, ComponentShutdown>(OnUserInterfaceShutdown);
+        }
+
+        private void OnUserInterfaceShutdown(EntityUid uid, ClientUserInterfaceComponent component, ComponentShutdown args)
+        {
+            foreach (var bui in component.Interfaces)
+            {
+                bui.Dispose();
+            }
+        }
+
+        private void MessageReceived(BoundUIWrapMessage ev)
+        {
+            var cmp = ComponentManager.GetComponent<ClientUserInterfaceComponent>(ev.Entity);
+
+            cmp.MessageReceived(ev);
+        }
+
+        internal void Send(BoundUIWrapMessage msg)
+        {
+            RaiseNetworkEvent(msg);
+        }
+    }
+}

Robust.Client/GameObjects/IClientEntityManager.cs

@@ -1,4 +1,3 @@
-using System.Collections.Generic;
 using Robust.Shared.GameObjects;
 
 namespace Robust.Client.GameObjects

Robust.Client/GameObjects/PlayerMessages.cs

@@ -1,14 +0,0 @@
-using Robust.Shared.GameObjects;
-
-namespace Robust.Client.GameObjects
-{
-    public class PlayerAttachedMsg : ComponentMessage
-    {
-
-    }
-
-    public class PlayerDetachedMsg : ComponentMessage
-    {
-
-    }
-}

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -1,29 +1,32 @@
+// ReSharper disable once RedundantUsingDirective
+// Used in EXCEPTION_TOLERANCE preprocessor
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using JetBrains.Annotations;
 using Robust.Client.GameObjects;
 using Robust.Client.Input;
 using Robust.Client.Map;
-using Robust.Shared.GameStates;
-using Robust.Shared.IoC;
-using Robust.Shared.Network.Messages;
 using Robust.Client.Player;
 using Robust.Client.Timing;
 using Robust.Shared;
 using Robust.Shared.Configuration;
 using Robust.Shared.Exceptions;
 using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
 using Robust.Shared.Input;
+using Robust.Shared.IoC;
 using Robust.Shared.Log;
-using Robust.Shared.Map;
 using Robust.Shared.Network;
+using Robust.Shared.Network.Messages;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
 namespace Robust.Client.GameStates
 {
     /// <inheritdoc />
+    [UsedImplicitly]
     public class ClientGameStateManager : IClientGameStateManager
     {
         private GameStateProcessor _processor = default!;
@@ -35,6 +38,8 @@ namespace Robust.Client.GameStates
             _pendingSystemMessages
                 = new();
 
+        private uint _metaCompNetId;
+
         [Dependency] private readonly IComponentFactory _compFactory = default!;
         [Dependency] private readonly IClientEntityManagerInternal _entities = default!;
         [Dependency] private readonly IEntityLookup _lookup = default!;
@@ -80,8 +85,8 @@ namespace Robust.Client.GameStates
         {
             _processor = new GameStateProcessor(_timing);
 
-            _network.RegisterNetMessage<MsgState>(MsgState.NAME, HandleStateMessage);
-            _network.RegisterNetMessage<MsgStateAck>(MsgStateAck.NAME);
+            _network.RegisterNetMessage<MsgState>(HandleStateMessage);
+            _network.RegisterNetMessage<MsgStateAck>();
             _client.RunLevelChanged += RunLevelChanged;
 
             _config.OnValueChanged(CVars.NetInterp, b => _processor.Interpolation = b, true);
@@ -98,6 +103,12 @@ namespace Robust.Client.GameStates
             Predicting = _config.GetCVar(CVars.NetPredict);
             PredictTickBias = _config.GetCVar(CVars.NetPredictTickBias);
             PredictLagBias = _config.GetCVar(CVars.NetPredictLagBias);
+
+            var metaId = _compFactory.GetRegistration(typeof(MetaDataComponent)).NetID;
+            if (!metaId.HasValue)
+                throw new InvalidOperationException("MetaDataComponent does not have a NetId.");
+
+            _metaCompNetId = metaId.Value;
         }
 
         /// <inheritdoc />
@@ -209,6 +220,11 @@ namespace Robust.Client.GameStates
                     ResetPredictedEntities(_timing.CurTick);
                 }
 
+                if (!curState.Extrapolated)
+                {
+                    _processor.UpdateFullRep(curState);
+                }
+
                 // Store last tick we got from the GameStateProcessor.
                 _lastProcessedTick = _timing.CurTick;
 
@@ -318,6 +334,8 @@ namespace Robust.Client.GameStates
 
         private void ResetPredictedEntities(GameTick curTick)
         {
+            var bus = (EntityEventBus) _entities.EventBus;
+
             foreach (var entity in _entities.GetEntities())
             {
                 // TODO: 99% there's an off-by-one here.
@@ -335,17 +353,18 @@ namespace Robust.Client.GameStates
                 }
 
                 // TODO: handle component deletions/creations.
-                foreach (var comp in _componentManager.GetNetComponents(entity.Uid))
+                foreach (var (netId, comp) in _componentManager.GetNetComponents(entity.Uid))
                 {
-                    DebugTools.AssertNotNull(comp.NetID);
+                    DebugTools.AssertNotNull(netId);
 
-                    if (comp.LastModifiedTick < curTick || !last.TryGetValue(comp.NetID!.Value, out var compState))
+                    if (comp.LastModifiedTick < curTick || !last.TryGetValue(netId, out var compState))
                     {
                         continue;
                     }
 
                     Logger.DebugS(CVars.NetPredict.Name, $"  And also its component {comp.Name}");
                     // TODO: Handle interpolation.
+                    bus.RaiseComponentEvent(comp, new ComponentHandleState(compState, null));
                     comp.HandleComponentState(compState, null);
                 }
             }
@@ -359,24 +378,22 @@ namespace Robust.Client.GameStates
             // so that we can later roll back to it (if necessary).
             var outputData = new Dictionary<EntityUid, Dictionary<uint, ComponentState>>();
 
+            Debug.Assert(_players.LocalPlayer != null, "_players.LocalPlayer != null");
+            var player = _players.LocalPlayer.Session;
+
             foreach (var createdEntity in createdEntities)
             {
                 var compData = new Dictionary<uint, ComponentState>();
                 outputData.Add(createdEntity, compData);
 
-                foreach (var component in _componentManager.GetNetComponents(createdEntity))
+                foreach (var (netId, component) in _componentManager.GetNetComponents(createdEntity))
                 {
-                    Debug.Assert(_players.LocalPlayer != null, "_players.LocalPlayer != null");
-
-                    var player = _players.LocalPlayer.Session;
                     var state = component.GetComponentState(player);
 
-                    if (state.GetType() == typeof(ComponentState))
-                    {
+                    if(state.GetType() == typeof(ComponentState))
                         continue;
-                    }
 
-                    compData.Add(state.NetID, state);
+                    compData.Add(netId, state);
                 }
             }
 
@@ -393,7 +410,7 @@ namespace Robust.Client.GameStates
         private List<EntityUid> ApplyGameState(GameState curState, GameState? nextState)
         {
             _config.TickProcessMessages();
-            _mapManager.ApplyGameStatePre(curState.MapData);
+            _mapManager.ApplyGameStatePre(curState.MapData, curState.EntityStates);
             var createdEntities = ApplyEntityStates(curState.EntityStates, curState.EntityDeletions,
                 nextState?.EntityStates);
             _players.ApplyPlayerStates(curState.PlayerStates);
@@ -418,16 +435,17 @@ namespace Robust.Client.GameStates
                     //Known entities
                     if (_entities.TryGetEntity(es.Uid, out var entity))
                     {
+                        // Logger.Debug($"[{IGameTiming.TickStampStatic}] MOD {es.Uid}");
                         toApply.Add(entity, (es, null));
                     }
                     else //Unknown entities
                     {
-                        var metaState = (MetaDataComponentState?) es.ComponentStates
-                            ?.FirstOrDefault(c => c.NetID == NetIDs.META_DATA);
+                        var metaState = (MetaDataComponentState?) es.ComponentChanges?.FirstOrDefault(c => c.NetID == _metaCompNetId).State;
                         if (metaState == null)
                         {
                             throw new InvalidOperationException($"Server sent new entity state for {es.Uid} without metadata component!");
                         }
+                        // Logger.Debug($"[{IGameTiming.TickStampStatic}] CREATE {es.Uid} {metaState.PrototypeId}");
                         var newEntity = (Entity)_entities.CreateEntity(metaState.PrototypeId, es.Uid);
                         toApply.Add(newEntity, (es, null));
                         toInitialize.Add(newEntity);
@@ -454,17 +472,20 @@ namespace Robust.Client.GameStates
                 }
             }
 
+            var bus = (EntityEventBus) _entities.EventBus;
+
             // Make sure this is done after all entities have been instantiated.
             foreach (var kvStates in toApply)
             {
                 var ent = kvStates.Key;
                 var entity = (Entity) ent;
-                HandleEntityState(entity.EntityManager.ComponentManager, entity, kvStates.Value.Item1,
+                HandleEntityState(entity.EntityManager.ComponentManager, entity, bus, kvStates.Value.Item1,
                     kvStates.Value.Item2);
             }
 
             foreach (var id in deletions)
             {
+                // Logger.Debug($"[{IGameTiming.TickStampStatic}] DELETE {id}");
                 _entities.DeleteEntity(id);
             }
 
@@ -526,10 +547,10 @@ namespace Robust.Client.GameStates
             return created;
         }
 
-        private void HandleEntityState(IComponentManager compMan, IEntity entity, EntityState? curState,
+        private void HandleEntityState(IComponentManager compMan, IEntity entity, EntityEventBus bus, EntityState? curState,
             EntityState? nextState)
         {
-            var compStateWork = new Dictionary<uint, (ComponentState? curState, ComponentState? nextState)>();
+            var compStateWork = new Dictionary<ushort, (ComponentState? curState, ComponentState? nextState)>();
             var entityUid = entity.Uid;
 
             if (curState?.ComponentChanges != null)
@@ -545,45 +566,50 @@ namespace Robust.Client.GameStates
                     }
                     else
                     {
+                        //Right now we just assume every state from an unseen entity is added
+
                         if (compMan.HasComponent(entityUid, compChange.NetID))
                             continue;
 
-                        var newComp = (Component) _compFactory.GetComponent(compChange.ComponentName!);
+                        var newComp = (Component) _compFactory.GetComponent(compChange.NetID);
                         newComp.Owner = entity;
                         compMan.AddComponent(entity, newComp, true);
+
+                        compStateWork[compChange.NetID] = (compChange.State, null);
                     }
                 }
             }
 
-            if (curState?.ComponentStates != null)
+            if (curState?.ComponentChanges != null)
             {
-                foreach (var compState in curState.ComponentStates)
+                foreach (var compChange in curState.ComponentChanges)
                 {
-                    compStateWork[compState.NetID] = (compState, null);
+                    compStateWork[compChange.NetID] = (compChange.State, null);
                 }
             }
 
-            if (nextState?.ComponentStates != null)
+            if (nextState?.ComponentChanges != null)
             {
-                foreach (var compState in nextState.ComponentStates)
+                foreach (var compState in nextState.ComponentChanges)
                 {
                     if (compStateWork.TryGetValue(compState.NetID, out var state))
                     {
-                        compStateWork[compState.NetID] = (state.curState, compState);
+                        compStateWork[compState.NetID] = (state.curState, compState.State);
                     }
                     else
                     {
-                        compStateWork[compState.NetID] = (null, compState);
+                        compStateWork[compState.NetID] = (null, compState.State);
                     }
                 }
             }
 
             foreach (var (netId, (cur, next)) in compStateWork)
             {
-                if (compMan.TryGetComponent(entityUid, netId, out var component))
+                if (compMan.TryGetComponent(entityUid, (ushort) netId, out var component))
                 {
                     try
                     {
+                        bus.RaiseComponentEvent(component, new ComponentHandleState(cur, next));
                         component.HandleComponentState(cur, next);
                     }
                     catch (Exception e)

Robust.Client/GameStates/GameStateProcessor.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Robust.Shared.GameObjects;
@@ -149,11 +149,6 @@ namespace Robust.Client.GameStates
                 {
                     Logger.DebugS("net.state", $"Applying State:  ext={curState!.Extrapolated}, cTick={_timing.CurTick}, fSeq={curState.FromSequence}, tSeq={curState.ToSequence}, buf={_stateBuffer.Count}");
                 }
-
-                if (!curState!.Extrapolated)
-                {
-                    UpdateFullRep(curState);
-                }
             }
 
             var cState = curState!;
@@ -162,8 +157,10 @@ namespace Robust.Client.GameStates
             return applyNextState;
         }
 
-        private void UpdateFullRep(GameState state)
+        public void UpdateFullRep(GameState state)
         {
+            // Logger.Debug($"UPDATE FULL REP: {string.Join(", ", state.EntityStates?.Select(e => e.Uid) ?? Enumerable.Empty<EntityUid>())}");
+
             if (state.FromSequence == GameTick.Zero)
             {
                 // Full state.
@@ -198,14 +195,10 @@ namespace Robust.Client.GameStates
                             {
                                 compData.Remove(change.NetID);
                             }
-                        }
-                    }
-
-                    if (entityState.ComponentStates != null)
-                    {
-                        foreach (var compState in entityState.ComponentStates)
-                        {
-                            compData[compState.NetID] = compState;
+                            else if (change.State is not null)
+                            {
+                                compData[change.NetID] = change.State;
+                            }
                         }
                     }
                 }

Robust.Client/GameStates/NetEntityOverlay.cs

@@ -146,13 +146,12 @@ namespace Robust.Client.GameStates
         private void DrawWorld(in OverlayDrawArgs args)
         {
             bool pvsEnabled = _configurationManager.GetCVar<bool>("net.pvs");
-
             if(!pvsEnabled)
                 return;
 
-            float pvsSize = _configurationManager.GetCVar<float>("net.maxupdaterange");
+            float pvsRange = _configurationManager.GetCVar<float>("net.maxupdaterange");
             var pvsCenter = _eyeManager.CurrentEye.Position;
-            Box2 pvsBox = Box2.CenteredAround(pvsCenter.Position, new Vector2(pvsSize, pvsSize));
+            Box2 pvsBox = Box2.CenteredAround(pvsCenter.Position, new Vector2(pvsRange * 2, pvsRange * 2));
 
             var worldHandle = args.WorldHandle;
 
@@ -179,7 +178,7 @@ namespace Robust.Client.GameStates
                 var yPos = 10 + _lineHeight * i;
                 var name = $"({netEnt.Id}) {ent.Prototype?.ID}";
                 var color = CalcTextColor(ref netEnt);
-                DrawString(screenHandle, _font, new Vector2(xPos + (TrafficHistorySize + 4), yPos), name, color);
+                screenHandle.DrawString(_font, new Vector2(xPos + (TrafficHistorySize + 4), yPos), name, color);
                 DrawTrafficBox(screenHandle, ref netEnt, xPos, yPos);
             }
         }
@@ -224,17 +223,6 @@ namespace Robust.Client.GameStates
             base.DisposeBehavior();
         }
 
-        private static void DrawString(DrawingHandleScreen handle, Font font, Vector2 pos, string str, Color textColor)
-        {
-            var baseLine = new Vector2(pos.X, font.GetAscent(1) + pos.Y);
-
-            foreach (var rune in str.EnumerateRunes())
-            {
-                var advance = font.DrawChar(handle, rune, baseLine, 1, textColor);
-                baseLine += new Vector2(advance, 0);
-            }
-        }
-
         private struct NetEntity
         {
             public GameTick LastUpdate;

Robust.Client/GameStates/NetGraphOverlay.cs

@@ -21,6 +21,7 @@ namespace Robust.Client.GameStates
         [Dependency] private readonly IGameTiming _gameTiming = default!;
         [Dependency] private readonly IClientNetManager _netManager = default!;
         [Dependency] private readonly IClientGameStateManager _gameStateManager = default!;
+        [Dependency] private readonly IComponentFactory _componentFactory = default!;
 
         private const int HistorySize = 60 * 3; // number of ticks to keep in history.
         private const int TargetPayloadBps = 56000 / 8; // Target Payload size in Bytes per second. A mind-numbing fifty-six thousand bits per second, who would ever need more?
@@ -90,17 +91,14 @@ namespace Robust.Client.GameStates
                             sb.Append($"\n  Changes:");
                             foreach (var compChange in entState.ComponentChanges)
                             {
-                                var del = compChange.Deleted ? 'D' : 'C';
-                                sb.Append($"\n    [{del}]{compChange.NetID}:{compChange.ComponentName}");
-                            }
-                        }
+                                var registration = _componentFactory.GetRegistration(compChange.NetID);
+                                var create = compChange.Created ? 'C' : '\0';
+                                var mod = !(compChange.Created || compChange.Created) ? 'M' : '\0';
+                                var del = compChange.Deleted ? 'D' : '\0';
+                                sb.Append($"\n    [{create}{mod}{del}]{compChange.NetID}:{registration.Name}");
 
-                        if (entState.ComponentStates is not null)
-                        {
-                            sb.Append($"\n  States:");
-                            foreach (var compState in entState.ComponentStates)
-                            {
-                                sb.Append($"\n    {compState.NetID}:{compState.GetType().Name}");
+                                if(compChange.State is not null)
+                                    sb.Append($"\n      STATE:{compChange.State.GetType().Name}");
                             }
                         }
                     }
@@ -184,7 +182,7 @@ namespace Robust.Client.GameStates
                 // Draw size if above average
                 if (drawSizeThreshold * 1.5 < state.Payload)
                 {
-                    DrawString(handle, _font, new Vector2(xOff, yoff - _font.GetLineHeight(1)), state.Payload.ToString());
+                    handle.DrawString(_font, new Vector2(xOff, yoff - _font.GetLineHeight(1)), state.Payload.ToString());
                 }
 
                 // second tick marks
@@ -224,14 +222,14 @@ namespace Robust.Client.GameStates
             handle.DrawLine(new Vector2(leftMargin, midYoff), new Vector2(leftMargin + width, midYoff), Color.DarkGray.WithAlpha(0.8f));
 
             // payload text
-            DrawString(handle, _font, new Vector2(leftMargin + width, warnYoff), "56K");
-            DrawString(handle, _font, new Vector2(leftMargin + width, midYoff), "33.6K");
+            handle.DrawString(_font, new Vector2(leftMargin + width, warnYoff), "56K");
+            handle.DrawString(_font, new Vector2(leftMargin + width, midYoff), "33.6K");
 
             // interp text info
             if(lastLagY != -1)
-                DrawString(handle, _font, new Vector2(leftMargin + width, lastLagY), $"{lastLagMs.ToString()}ms");
+                handle.DrawString(_font, new Vector2(leftMargin + width, lastLagY), $"{lastLagMs.ToString()}ms");
 
-            DrawString(handle, _font, new Vector2(leftMargin, height + LowerGraphOffset), $"{_gameStateManager.CurrentBufferSize.ToString()} states");
+            handle.DrawString(_font, new Vector2(leftMargin, height + LowerGraphOffset), $"{_gameStateManager.CurrentBufferSize.ToString()} states");
         }
 
         protected override void DisposeBehavior()
@@ -241,17 +239,6 @@ namespace Robust.Client.GameStates
             base.DisposeBehavior();
         }
 
-        private void DrawString(DrawingHandleScreen handle, Font font, Vector2 pos, string str)
-        {
-            var baseLine = new Vector2(pos.X, font.GetAscent(1) + pos.Y);
-
-            foreach (var rune in str.EnumerateRunes())
-            {
-                var advance = font.DrawChar(handle, rune, baseLine, 1, Color.White);
-                baseLine += new Vector2(advance, 0);
-            }
-        }
-
         private class NetShowGraphCommand : IConsoleCommand
         {
             public string Command => "net_graph";

Robust.Client/Graphics/Clyde/Audio/Clyde.Audio.cs

@@ -44,8 +44,12 @@ namespace Robust.Client.Graphics.Clyde
 
         internal bool IsEfxSupported;
 
+        private ISawmill _openALSawmill = default!;
+
         private void _initializeAudio()
         {
+            _openALSawmill = Logger.GetSawmill("clyde.oal");
+
             _audioOpenDevice();
 
             // Create OpenAL context.
@@ -74,9 +78,9 @@ namespace Robust.Client.Graphics.Clyde
                 _alContextExtensions.Add(extension);
             }
 
-            Logger.DebugS("clyde.oal", "OpenAL Vendor: {0}", AL.Get(ALGetString.Vendor));
-            Logger.DebugS("clyde.oal", "OpenAL Renderer: {0}", AL.Get(ALGetString.Renderer));
-            Logger.DebugS("clyde.oal", "OpenAL Version: {0}", AL.Get(ALGetString.Version));
+            _openALSawmill.Debug("OpenAL Vendor: {0}", AL.Get(ALGetString.Vendor));
+            _openALSawmill.Debug("OpenAL Renderer: {0}", AL.Get(ALGetString.Renderer));
+            _openALSawmill.Debug("OpenAL Version: {0}", AL.Get(ALGetString.Version));
         }
 
         private void _audioOpenDevice()
@@ -89,7 +93,7 @@ namespace Robust.Client.Graphics.Clyde
                 _openALDevice = ALC.OpenDevice(preferredDevice);
                 if (_openALDevice == IntPtr.Zero)
                 {
-                    Logger.WarningS("clyde.oal", "Unable to open preferred audio device '{0}': {1}. Falling back default.",
+                    _openALSawmill.Warning("Unable to open preferred audio device '{0}': {1}. Falling back default.",
                         preferredDevice, ALC.GetError(ALDevice.Null));
 
                     _openALDevice = ALC.OpenDevice(null);
@@ -153,7 +157,7 @@ namespace Robust.Client.Graphics.Clyde
             // Clear out finalized audio sources.
             while (_sourceDisposeQueue.TryDequeue(out var handles))
             {
-                Logger.DebugS("clyde.oal", "Cleaning out source {0} which finalized in another thread.", handles.sourceHandle);
+                _openALSawmill.Debug("Cleaning out source {0} which finalized in another thread.", handles.sourceHandle);
                 if (IsEfxSupported) RemoveEfx(handles);
                 AL.DeleteSource(handles.sourceHandle);
                 _checkAlError();
@@ -163,7 +167,7 @@ namespace Robust.Client.Graphics.Clyde
             // Clear out finalized buffered audio sources.
             while (_bufferedSourceDisposeQueue.TryDequeue(out var handles))
             {
-                Logger.DebugS("clyde.oal", "Cleaning out buffered source {0} which finalized in another thread.", handles.sourceHandle);
+                _openALSawmill.Debug("Cleaning out buffered source {0} which finalized in another thread.", handles.sourceHandle);
                 if (IsEfxSupported) RemoveEfx(handles);
                 AL.DeleteSource(handles.sourceHandle);
                 _checkAlError();
@@ -211,24 +215,24 @@ namespace Robust.Client.Graphics.Clyde
             return audioSource;
         }
 
-        private static void _checkAlcError(ALDevice device,
+        private void _checkAlcError(ALDevice device,
             [CallerMemberName] string callerMember = "",
             [CallerLineNumber] int callerLineNumber = -1)
         {
             var error = ALC.GetError(device);
             if (error != AlcError.NoError)
             {
-                Logger.ErrorS("clyde.oal", "[{0}:{1}] ALC error: {2}", callerMember, callerLineNumber, error);
+                _openALSawmill.Error("[{0}:{1}] ALC error: {2}", callerMember, callerLineNumber, error);
             }
         }
 
-        private static void _checkAlError([CallerMemberName] string callerMember = "",
+        private void _checkAlError([CallerMemberName] string callerMember = "",
             [CallerLineNumber] int callerLineNumber = -1)
         {
             var error = AL.GetError();
             if (error != ALError.NoError)
             {
-                Logger.ErrorS("clyde.oal", "[{0}:{1}] AL error: {2}", callerMember, callerLineNumber, error);
+                _openALSawmill.Error("[{0}:{1}] AL error: {2}", callerMember, callerLineNumber, error);
             }
         }
 
@@ -330,6 +334,35 @@ namespace Robust.Client.Graphics.Clyde
             return new AudioStream(handle, length, wav.NumChannels, name);
         }
 
+        public AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null)
+        {
+            var fmt = channels switch
+            {
+                1 => ALFormat.Mono16,
+                2 => ALFormat.Stereo16,
+                _ => throw new ArgumentOutOfRangeException(
+                    nameof(channels), "Only stereo and mono is currently supported")
+            };
+
+            var buffer = AL.GenBuffer();
+            _checkAlError();
+
+            unsafe
+            {
+                fixed (short* ptr = samples)
+                {
+                    AL.BufferData(buffer, fmt, (IntPtr) ptr, samples.Length * sizeof(short), sampleRate);
+                }
+            }
+
+            _checkAlError();
+
+            var handle = new ClydeHandle(_audioSampleBuffers.Count);
+            var length = TimeSpan.FromSeconds((double) samples.Length / channels / sampleRate);
+            _audioSampleBuffers.Add(new LoadedAudioSample(buffer));
+            return new AudioStream(handle, length, channels, name);
+        }
+
         private sealed class LoadedAudioSample
         {
             public readonly int BufferHandle;
@@ -381,14 +414,14 @@ namespace Robust.Client.Graphics.Clyde
             {
                 _checkDisposed();
                 AL.SourcePlay(SourceHandle);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void StopPlaying()
             {
                 _checkDisposed();
                 AL.SourceStop(SourceHandle);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public bool IsPlaying
@@ -407,14 +440,14 @@ namespace Robust.Client.Graphics.Clyde
                 {
                     _checkDisposed();
                     AL.GetSource(SourceHandle, ALSourceb.Looping, out var ret);
-                    _checkAlError();
+                    _master._checkAlError();
                     return ret;
                 }
                 set
                 {
                     _checkDisposed();
                     AL.Source(SourceHandle, ALSourceb.Looping, value);
-                    _checkAlError();
+                    _master._checkAlError();
                 }
             }
 
@@ -422,7 +455,7 @@ namespace Robust.Client.Graphics.Clyde
             {
                 _checkDisposed();
                 AL.Source(SourceHandle, ALSourceb.SourceRelative, true);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void SetVolume(float decibels)
@@ -436,7 +469,21 @@ namespace Robust.Client.Graphics.Clyde
                 }
                 _gain =  MathF.Pow(10, decibels / 10);
                 AL.Source(SourceHandle, ALSourcef.Gain, _gain * priorOcclusion);
-                _checkAlError();
+                _master._checkAlError();
+            }
+
+            public void SetVolumeDirect(float scale)
+            {
+                _checkDisposed();
+                var priorOcclusion = 1f;
+                if (!IsEfxSupported)
+                {
+                    AL.GetSource(SourceHandle, ALSourcef.Gain, out var priorGain);
+                    priorOcclusion = priorGain / _gain;
+                }
+                _gain = scale;
+                AL.Source(SourceHandle, ALSourcef.Gain, _gain * priorOcclusion);
+                _master._checkAlError();
             }
 
             public void SetOcclusion(float blocks)
@@ -453,7 +500,7 @@ namespace Robust.Client.Graphics.Clyde
                     gain *= gain * gain;
                     AL.Source(SourceHandle, ALSourcef.Gain, _gain * gain);
                 }
-                _checkAlError();
+                _master._checkAlError();
             }
 
             private void SetOcclusionEfx(float gain, float cutoff)
@@ -473,7 +520,7 @@ namespace Robust.Client.Graphics.Clyde
             {
                 _checkDisposed();
                 AL.Source(SourceHandle, ALSourcef.SecOffset, seconds);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public bool SetPosition(Vector2 position)
@@ -499,7 +546,7 @@ namespace Robust.Client.Graphics.Clyde
 #endif
 
                 AL.Source(SourceHandle, ALSource3f.Position, x, y, 0);
-                _checkAlError();
+                _master._checkAlError();
                 return true;
             }
 
@@ -526,14 +573,14 @@ namespace Robust.Client.Graphics.Clyde
 
                 AL.Source(SourceHandle, ALSource3f.Velocity, x, y, 0);
 
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void SetPitch(float pitch)
             {
                 _checkDisposed();
                 AL.Source(SourceHandle, ALSourcef.Pitch, pitch);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             ~AudioSource()
@@ -559,7 +606,7 @@ namespace Robust.Client.Graphics.Clyde
                     if (FilterHandle != 0) EFX.DeleteFilter(FilterHandle);
                     AL.DeleteSource(SourceHandle);
                     _master._audioSources.Remove(SourceHandle);
-                    _checkAlError();
+                    _master._checkAlError();
                 }
 
                 SourceHandle = -1;
@@ -609,7 +656,7 @@ namespace Robust.Client.Graphics.Clyde
                 _checkDisposed();
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.SourcePlay(stackalloc int[] {SourceHandle!.Value});
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void StopPlaying()
@@ -617,7 +664,7 @@ namespace Robust.Client.Graphics.Clyde
                 _checkDisposed();
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.SourceStop(SourceHandle!.Value);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public bool IsPlaying
@@ -643,7 +690,7 @@ namespace Robust.Client.Graphics.Clyde
                 _mono = false;
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.Source(SourceHandle!.Value, ALSourceb.SourceRelative, true);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void SetLooping()
@@ -662,7 +709,21 @@ namespace Robust.Client.Graphics.Clyde
                 }
                 _gain =  MathF.Pow(10, decibels / 10);
                 AL.Source(SourceHandle!.Value, ALSourcef.Gain, _gain * priorOcclusion);
-                _checkAlError();
+                _master._checkAlError();
+            }
+
+            public void SetVolumeDirect(float scale)
+            {
+                _checkDisposed();
+                var priorOcclusion = 1f;
+                if (!IsEfxSupported)
+                {
+                    AL.GetSource(SourceHandle!.Value, ALSourcef.Gain, out var priorGain);
+                    priorOcclusion = priorGain / _gain;
+                }
+                _gain = scale;
+                AL.Source(SourceHandle!.Value, ALSourcef.Gain, _gain * priorOcclusion);
+                _master._checkAlError();
             }
 
             public void SetOcclusion(float blocks)
@@ -680,7 +741,7 @@ namespace Robust.Client.Graphics.Clyde
                     AL.Source(SourceHandle!.Value, ALSourcef.Gain, gain * _gain);
                 }
 
-                _checkAlError();
+                _master._checkAlError();
             }
 
             private void SetOcclusionEfx(float gain, float cutoff)
@@ -700,7 +761,7 @@ namespace Robust.Client.Graphics.Clyde
                 _checkDisposed();
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.Source(SourceHandle!.Value, ALSourcef.SecOffset, seconds);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public bool SetPosition(Vector2 position)
@@ -717,7 +778,7 @@ namespace Robust.Client.Graphics.Clyde
                 _mono = true;
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.Source(SourceHandle!.Value, ALSource3f.Position, x, y, 0);
-                _checkAlError();
+                _master._checkAlError();
                 return true;
             }
 
@@ -744,7 +805,7 @@ namespace Robust.Client.Graphics.Clyde
 
                 AL.Source(SourceHandle!.Value, ALSource3f.Velocity, x, y, 0);
 
-                _checkAlError();
+                _master._checkAlError();
             }
 
             public void SetPitch(float pitch)
@@ -752,7 +813,7 @@ namespace Robust.Client.Graphics.Clyde
                 _checkDisposed();
                 // ReSharper disable once PossibleInvalidOperationException
                 AL.Source(SourceHandle!.Value, ALSourcef.Pitch, pitch);
-                _checkAlError();
+                _master._checkAlError();
             }
 
             ~BufferedAudioSource()
@@ -783,7 +844,7 @@ namespace Robust.Client.Graphics.Clyde
                     AL.DeleteSource(SourceHandle.Value);
                     AL.DeleteBuffers(BufferHandles);
                     _master._bufferedAudioSources.Remove(SourceHandle.Value);
-                    _checkAlError();
+                    _master._checkAlError();
                 }
 
                 SourceHandle = null;

Robust.Client/Graphics/Clyde/Clyde.DllMap.cs

@@ -11,7 +11,7 @@ namespace Robust.Client.Graphics.Clyde
     {
         static Clyde()
         {
-            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) &&
+            if (OperatingSystem.IsWindows() &&
                 RuntimeInformation.ProcessArchitecture == Architecture.X64 &&
                 Environment.GetEnvironmentVariable("ROBUST_INTEGRATED_GPU") != "1")
             {
@@ -28,20 +28,20 @@ namespace Robust.Client.Graphics.Clyde
                 }
             }
 
-            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            if (OperatingSystem.IsWindows())
             {
                 return;
             }
 
             NativeLibrary.SetDllImportResolver(typeof(GL).Assembly, (name, assembly, path) =>
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux)
+                if (OperatingSystem.IsLinux()
                     && _dllMapLinux.TryGetValue(name, out var mappedName))
                 {
                     return NativeLibrary.Load(mappedName);
                 }
 
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)
+                if (OperatingSystem.IsMacOS()
                     && _dllMapMacOS.TryGetValue(name, out mappedName))
                 {
                     return NativeLibrary.Load(mappedName);

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

@@ -366,33 +366,14 @@ namespace Robust.Client.Graphics.Clyde
         private void ProcessSpriteEntities(MapId map, Box2 worldBounds,
             RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> list)
         {
-            var spriteSystem = _entitySystemManager.GetEntitySystem<RenderingTreeSystem>();
-
-            foreach (var gridId in _mapManager.FindGridIdsIntersecting(map, worldBounds, true))
+            foreach (var comp in _entitySystemManager.GetEntitySystem<RenderingTreeSystem>().GetRenderTrees(map, worldBounds))
             {
-                Box2 gridBounds;
+                var bounds = worldBounds.Translated(-comp.Owner.Transform.WorldPosition);
 
-                if (gridId == GridId.Invalid)
-                {
-                    gridBounds = worldBounds;
-                }
-                else
-                {
-                    gridBounds = worldBounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
-                }
-
-                var tree = spriteSystem.GetSpriteTreeForMap(map, gridId);
-
-                tree.QueryAabb(ref list, ((
+                comp.SpriteTree.QueryAabb(ref list, ((
                     ref RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> state,
                     in SpriteComponent value) =>
                 {
-                    // TODO: Probably value in storing this as its own DynamicTree
-                    if (value.ContainerOccluded || !value.Visible)
-                    {
-                        return true;
-                    }
-
                     var entity = value.Owner;
                     var transform = entity.Transform;
 
@@ -404,7 +385,7 @@ namespace Robust.Client.Graphics.Clyde
                     entry.yWorldPos = worldPos.Y;
                     return true;
 
-                }), gridBounds, approx: true);
+                }), bounds, true);
             }
         }
 

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

@@ -149,16 +149,16 @@ namespace Robust.Client.Graphics.Clyde
             // FOV FBO.
             _fovRenderTarget = CreateRenderTarget((FovMapSize, 2),
                 new RenderTargetFormatParameters(_hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
-                new TextureSampleParameters {WrapMode = TextureWrapMode.Repeat},
+                new TextureSampleParameters { WrapMode = TextureWrapMode.Repeat },
                 nameof(_fovRenderTarget));
 
             if (_hasGLSamplerObjects)
             {
                 _fovFilterSampler = new GLHandle(GL.GenSampler());
-                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureMagFilter, (int) All.Linear);
-                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureMinFilter, (int) All.Linear);
-                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureWrapS, (int) All.Repeat);
-                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureWrapT, (int) All.Repeat);
+                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureMagFilter, (int)All.Linear);
+                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureMinFilter, (int)All.Linear);
+                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureWrapS, (int)All.Repeat);
+                GL.SamplerParameter(_fovFilterSampler.Handle, SamplerParameterName.TextureWrapT, (int)All.Repeat);
                 CheckGlError();
             }
 
@@ -180,20 +180,17 @@ namespace Robust.Client.Graphics.Clyde
             _fovCalculationProgram = _compileProgram(depthVert, depthFrag, attribLocations, "Shadow Depth Program");
 
             var debugShader = _resourceCache.GetResource<ShaderSourceResource>("/Shaders/Internal/depth-debug.swsl");
-            _fovDebugShaderInstance = (ClydeShaderInstance) InstanceShader(debugShader.ClydeHandle);
+            _fovDebugShaderInstance = (ClydeShaderInstance)InstanceShader(debugShader.ClydeHandle);
 
             ClydeHandle LoadShaderHandle(string path)
             {
-                try
+                if (_resourceCache.TryGetResource(path, out ShaderSourceResource? resource))
                 {
-                    var shaderSource = _resourceCache.GetResource<ShaderSourceResource>(path);
-                    return shaderSource.ClydeHandle;
-                }
-                catch (Exception ex)
-                {
-                    Logger.Warning($"Can't load shader {path}\n{ex.GetType().Name}: {ex.Message}");
-                    return default;
+                    return resource.ClydeHandle;
                 }
+
+                Logger.Warning($"Can't load shader {path}\n");
+                return default;
             }
 
             _lightSoftShaderHandle = LoadShaderHandle("/Shaders/Internal/light-soft.swsl");
@@ -214,7 +211,7 @@ namespace Robust.Client.Graphics.Clyde
             {
                 // Calculate maximum distance for the projection based on screen size.
                 var screenSizeCut = viewport.Size / EyeManager.PixelsPerMeter;
-                var maxDist = (float) Math.Max(screenSizeCut.X, screenSizeCut.Y);
+                var maxDist = (float)Math.Max(screenSizeCut.X, screenSizeCut.Y);
 
                 // FOV is rendered twice.
                 // Once with back face culling like regular lighting.
@@ -497,24 +494,16 @@ namespace Robust.Client.Graphics.Clyde
             GetLightsToRender(MapId map, in Box2 worldBounds)
         {
             var renderingTreeSystem = _entitySystemManager.GetEntitySystem<RenderingTreeSystem>();
+            var enlargedBounds = worldBounds.Enlarged(renderingTreeSystem.MaxLightRadius);
+
+            // Use worldbounds for this one as we only care if the light intersects our actual bounds
             var state = (this, worldBounds, count: 0);
 
-            foreach (var gridId in _mapManager.FindGridIdsIntersecting(map, worldBounds, true))
+            foreach (var comp in renderingTreeSystem.GetRenderTrees(map, enlargedBounds))
             {
-                Box2 gridBounds;
+                var bounds = worldBounds.Translated(-comp.Owner.Transform.WorldPosition);
 
-                if (gridId == GridId.Invalid)
-                {
-                    gridBounds = worldBounds;
-                }
-                else
-                {
-                    gridBounds = worldBounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
-                }
-
-                var lightTree = renderingTreeSystem.GetLightTreeForMap(map, gridId);
-
-                lightTree.QueryAabb(ref state, (ref (Clyde clyde, Box2 worldBounds, int count) state, in PointLightComponent light) =>
+                comp.LightTree.QueryAabb(ref state, (ref (Clyde clyde, Box2 worldBounds, int count) state, in PointLightComponent light) =>
                 {
                     var transform = light.Owner.Transform;
 
@@ -524,12 +513,6 @@ namespace Robust.Client.Graphics.Clyde
                         return false;
                     }
 
-                    // TODO: Don't insert into trees for these, same as sprites.
-                    if (!light.Enabled || light.ContainerOccluded)
-                    {
-                        return true;
-                    }
-
                     var lightPos = transform.WorldMatrix.Transform(light.Offset);
 
                     var circle = new Circle(lightPos, light.Radius);
@@ -544,7 +527,7 @@ namespace Robust.Client.Graphics.Clyde
                     state.clyde._lightsToRenderList[state.count++] = (light, lightPos, distanceSquared);
 
                     return true;
-                }, gridBounds);
+                }, bounds);
             }
 
             if (state.count > _maxLightsPerScene)
@@ -590,7 +573,7 @@ namespace Robust.Client.Graphics.Clyde
 
             SetupGlobalUniformsImmediate(shader, viewport.LightRenderTarget.Texture);
 
-            shader.SetUniformMaybe("size", (Vector2) viewport.WallBleedIntermediateRenderTarget1.Size);
+            shader.SetUniformMaybe("size", (Vector2)viewport.WallBleedIntermediateRenderTarget1.Size);
             shader.SetUniformTextureMaybe(UniIMainTexture, TextureUnit.Texture0);
 
             var size = viewport.WallBleedIntermediateRenderTarget1.Size;
@@ -809,7 +792,7 @@ namespace Robust.Client.Graphics.Clyde
 
                     occluderTree.QueryAabb((in OccluderComponent sOccluder) =>
                     {
-                        var occluder = (ClientOccluderComponent) sOccluder;
+                        var occluder = (ClientOccluderComponent)sOccluder;
                         var transform = occluder.Owner.Transform;
                         if (!occluder.Enabled)
                         {
@@ -893,11 +876,11 @@ namespace Robust.Client.Graphics.Clyde
                                 // DddD
                                 // HHhh
                                 // deflection
-                                arrayVIBuffer[avi++] = (byte) ((((vi + 1) & 2) != 0) ? 0 : 255);
+                                arrayVIBuffer[avi++] = (byte)((((vi + 1) & 2) != 0) ? 0 : 255);
                                 // height
-                                arrayVIBuffer[avi++] = (byte) (((vi & 2) != 0) ? 0 : 255);
+                                arrayVIBuffer[avi++] = (byte)(((vi & 2) != 0) ? 0 : 255);
                             }
-                            QuadBatchIndexWrite(indexBuffer, ref ii, (ushort) aiBase);
+                            QuadBatchIndexWrite(indexBuffer, ref ii, (ushort)aiBase);
                         }
 
                         // North face (TL/TR)
@@ -931,7 +914,7 @@ namespace Robust.Client.Graphics.Clyde
                         arrayMaskBuffer[ami + 3] = new Vector2(blX, blY);
 
                         // Generate mask indices.
-                        QuadBatchIndexWrite(indexMaskBuffer, ref imi, (ushort) ami);
+                        QuadBatchIndexWrite(indexMaskBuffer, ref imi, (ushort)ami);
 
                         ami += 4;
 
@@ -973,7 +956,7 @@ namespace Robust.Client.Graphics.Clyde
             var lightMapSize = GetLightMapSize(viewport.Size);
             var lightMapSizeQuart = GetLightMapSize(viewport.Size, true);
             var lightMapColorFormat = _hasGLFloatFramebuffers ? RenderTargetColorFormat.R11FG11FB10F : RenderTargetColorFormat.Rgba8;
-            var lightMapSampleParameters = new TextureSampleParameters {Filter = true};
+            var lightMapSampleParameters = new TextureSampleParameters { Filter = true };
 
             viewport.LightRenderTarget?.Dispose();
             viewport.WallMaskRenderTarget?.Dispose();
@@ -1010,14 +993,14 @@ namespace Robust.Client.Graphics.Clyde
 
         private Vector2i GetLightMapSize(Vector2i screenSize, bool furtherDivide = false)
         {
-            var divider = (float) _lightmapDivider;
+            var divider = (float)_lightmapDivider;
             if (furtherDivide)
             {
                 divider *= 2;
             }
 
-            var w = (int) Math.Ceiling(screenSize.X / divider);
-            var h = (int) Math.Ceiling(screenSize.Y / divider);
+            var w = (int)Math.Ceiling(screenSize.X / divider);
+            var h = (int)Math.Ceiling(screenSize.Y / divider);
 
             return (w, h);
         }
@@ -1043,7 +1026,7 @@ namespace Robust.Client.Graphics.Clyde
             // Shadow FBO.
             _shadowRenderTarget = CreateRenderTarget((ShadowMapSize, _maxLightsPerScene),
                 new RenderTargetFormatParameters(_hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
-                new TextureSampleParameters {WrapMode = TextureWrapMode.Repeat, Filter = true},
+                new TextureSampleParameters { WrapMode = TextureWrapMode.Repeat, Filter = true },
                 nameof(_shadowRenderTarget));
         }
 

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

@@ -131,7 +131,7 @@ namespace Robust.Client.Graphics.Clyde
 
             if (!succeeded)
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                if (OperatingSystem.IsWindows())
                 {
                     var msgBoxContent = "Failed to create the game window. " +
                                         "This probably means your GPU is too old to play the game. " +
@@ -164,7 +164,7 @@ namespace Robust.Client.Graphics.Clyde
 
         private IEnumerable<Image<Rgba32>> LoadWindowIcons()
         {
-            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            if (OperatingSystem.IsMacOS())
             {
                 // Does nothing on macOS so don't bother.
                 yield break;
@@ -210,11 +210,11 @@ namespace Robust.Client.Graphics.Clyde
             _windowing!.WindowRequestAttention(_windowing.MainWindow!);
         }
 
-        public async Task<IClydeWindow> CreateWindow(WindowCreateParameters parameters)
+        public IClydeWindow CreateWindow(WindowCreateParameters parameters)
         {
             DebugTools.AssertNotNull(_windowing);
 
-            return await _windowing!.WindowCreate(parameters);
+            return _windowing!.WindowCreate(parameters);
         }
 
         private void DoDestroyWindow(WindowReg reg)
@@ -470,18 +470,20 @@ namespace Robust.Client.Graphics.Clyde
 
         private sealed class MonitorHandle : IClydeMonitor
         {
-            public MonitorHandle(int id, string name, Vector2i size, int refreshRate)
+            public MonitorHandle(int id, string name, Vector2i size, int refreshRate, VideoMode[] videoModes)
             {
                 Id = id;
                 Name = name;
                 Size = size;
                 RefreshRate = refreshRate;
+                VideoModes = videoModes;
             }
 
             public int Id { get; }
             public string Name { get; }
             public Vector2i Size { get; }
             public int RefreshRate { get; }
+            public IEnumerable<VideoMode> VideoModes { get; }
         }
 
         private abstract class MonitorReg

Robust.Client/Graphics/Clyde/Clyde.cs

@@ -59,7 +59,6 @@ namespace Robust.Client.Graphics.Clyde
         private bool _enableSoftShadows = true;
 
         private bool _checkGLErrors;
-        private bool _initialized;
 
         private Thread? _gameThread;
 
@@ -105,7 +104,6 @@ namespace Robust.Client.Graphics.Clyde
                 return false;
 
             _initializeAudio();
-            _initialized = true;
             return true;
         }
 

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -48,14 +48,14 @@ namespace Robust.Client.Graphics.Clyde
         public IClydeDebugInfo DebugInfo { get; } = new DummyDebugInfo();
         public IClydeDebugStats DebugStats { get; } = new DummyDebugStats();
 
-        public event Action<TextEventArgs>? TextEntered;
-        public event Action<MouseMoveEventArgs>? MouseMove;
-        public event Action<MouseEnterLeaveEventArgs>? MouseEnterLeave;
-        public event Action<KeyEventArgs>? KeyUp;
-        public event Action<KeyEventArgs>? KeyDown;
-        public event Action<MouseWheelEventArgs>? MouseWheel;
-        public event Action<WindowClosedEventArgs>? CloseWindow;
-        public event Action<WindowDestroyedEventArgs>? DestroyWindow;
+        public event Action<TextEventArgs>? TextEntered { add { } remove { } }
+        public event Action<MouseMoveEventArgs>? MouseMove { add { } remove { } }
+        public event Action<MouseEnterLeaveEventArgs>? MouseEnterLeave { add { } remove { } }
+        public event Action<KeyEventArgs>? KeyUp { add { } remove { } }
+        public event Action<KeyEventArgs>? KeyDown { add { } remove { } }
+        public event Action<MouseWheelEventArgs>? MouseWheel { add { } remove { } }
+        public event Action<WindowClosedEventArgs>? CloseWindow { add { } remove { } }
+        public event Action<WindowDestroyedEventArgs>? DestroyWindow { add { } remove { } }
 
         public Texture GetStockTexture(ClydeStockTexture stockTexture)
         {
@@ -210,7 +210,7 @@ namespace Robust.Client.Graphics.Clyde
             yield break;
         }
 
-        public Task<IClydeWindow> CreateWindow(WindowCreateParameters parameters)
+        public IClydeWindow CreateWindow(WindowCreateParameters parameters)
         {
             var window = new DummyWindow(CreateRenderTarget((123, 123), default))
             {
@@ -218,7 +218,7 @@ namespace Robust.Client.Graphics.Clyde
             };
             _windows.Add(window);
 
-            return Task.FromResult<IClydeWindow>(window);
+            return window;
         }
 
         public ClydeHandle LoadShader(ParsedShader shader, string? name = null)
@@ -248,6 +248,12 @@ namespace Robust.Client.Graphics.Clyde
             return new(default, default, 1, name);
         }
 
+        public AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null)
+        {
+            // TODO: Might wanna actually load this so the length gets reported correctly.
+            return new(default, default, channels, name);
+        }
+
         public IClydeAudioSource CreateAudioSource(AudioStream stream)
         {
             return DummyAudioSource.Instance;
@@ -323,6 +329,11 @@ namespace Robust.Client.Graphics.Clyde
                 // Nada.
             }
 
+            public void SetVolumeDirect(float scale)
+            {
+                // Nada.
+            }
+
             public void SetOcclusion(float blocks)
             {
                 // Nada.
@@ -594,7 +605,7 @@ namespace Robust.Client.Graphics.Clyde
             public bool IsVisible { get; set; } = true;
             public Vector2 ContentScale => Vector2.One;
             public bool DisposeOnClose { get; set; }
-            public event Action<WindowClosedEventArgs>? Closed;
+            public event Action<WindowClosedEventArgs>? Closed { add { } remove { } }
 
             public void MaximizeOnMonitor(IClydeMonitor monitor)
             {

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

@@ -71,7 +71,7 @@ namespace Robust.Client.Graphics.Clyde
                 var impl = (CursorImpl) cursor;
                 DebugTools.Assert(impl.Owner == this);
 
-                if (impl.Id == null)
+                if (impl.Id == default)
                 {
                     throw new ObjectDisposedException(nameof(cursor));
                 }

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

@@ -1,6 +1,8 @@
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 using OpenToolkit.GraphicsLibraryFramework;
 using Robust.Shared.Utility;
+using GlfwVideoMode = OpenToolkit.GraphicsLibraryFramework.VideoMode;
 
 namespace Robust.Client.Graphics.Clyde
 {
@@ -18,7 +20,6 @@ namespace Robust.Client.Graphics.Clyde
             private readonly Dictionary<int, WinThreadMonitorReg> _winThreadMonitors = new();
 
             // Can't use ClydeHandle because it's 64 bit.
-            // TODO: this should be MONITOR ID.
             private int _nextMonitorId = 1;
             private int _primaryMonitorId;
             private readonly Dictionary<int, GlfwMonitorReg> _monitors = new();
@@ -39,6 +40,7 @@ namespace Robust.Client.Graphics.Clyde
                 ProcessEvents();
             }
 
+            [MethodImpl(MethodImplOptions.NoInlining)]
             private void WinThreadSetupMonitor(Monitor* monitor)
             {
                 var id = _nextMonitorId++;
@@ -48,12 +50,31 @@ namespace Robust.Client.Graphics.Clyde
 
                 var name = GLFW.GetMonitorName(monitor);
                 var videoMode = GLFW.GetVideoMode(monitor);
+                var modesPtr = GLFW.GetVideoModesRaw(monitor, out var modeCount);
+                var modes = new VideoMode[modeCount];
+                for (var i = 0; i < modes.Length; i++)
+                {
+                    modes[i] = ConvertVideoMode(modesPtr[i]);
+                }
 
                 GLFW.SetMonitorUserPointer(monitor, (void*) id);
 
                 _winThreadMonitors.Add(id, new WinThreadMonitorReg {Ptr = monitor});
 
-                SendEvent(new EventMonitorSetup(id, name, *videoMode));
+                SendEvent(new EventMonitorSetup(id, name, ConvertVideoMode(*videoMode), modes));
+            }
+
+            private static VideoMode ConvertVideoMode(in GlfwVideoMode mode)
+            {
+                return new()
+                {
+                    Width = (ushort) mode.Width,
+                    Height = (ushort) mode.Height,
+                    RedBits = (byte) mode.RedBits,
+                    RefreshRate = (ushort) mode.RefreshRate,
+                    GreenBits = (byte) mode.GreenBits,
+                    BlueBits = (byte) mode.BlueBits,
+                };
             }
 
             private void ProcessSetupMonitor(EventMonitorSetup ev)
@@ -61,8 +82,9 @@ namespace Robust.Client.Graphics.Clyde
                 var impl = new MonitorHandle(
                     ev.Id,
                     ev.Name,
-                    (ev.Mode.Width, ev.Mode.Height),
-                    ev.Mode.RefreshRate);
+                    (ev.CurrentMode.Width, ev.CurrentMode.Height),
+                    ev.CurrentMode.RefreshRate,
+                    ev.AllModes);
 
                 _clyde._monitorHandles.Add(impl);
                 _monitors[ev.Id] = new GlfwMonitorReg

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

@@ -210,7 +210,8 @@ namespace Robust.Client.Graphics.Clyde
             (
                 int Id,
                 string Name,
-                VideoMode Mode
+                VideoMode CurrentMode,
+                VideoMode[] AllModes
             ) : EventBase;
 
             private record EventMonitorDestroy

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

@@ -1,4 +1,4 @@
-using System.Runtime.InteropServices;
+using System;
 using System.Threading.Channels;
 using System.Threading.Tasks;
 using OpenToolkit.GraphicsLibraryFramework;
@@ -13,11 +13,6 @@ namespace Robust.Client.Graphics.Clyde
     {
         private sealed partial class GlfwWindowingImpl
         {
-            // glfwPostEmptyEvent is broken on macOS and crashes when not called from the main thread
-            // (despite what the docs claim, and yes this makes it useless).
-            // Because of this, we just forego it and use glfwWaitEventsTimeout on macOS instead.
-            private static readonly bool IsMacOS = RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
-
             private bool _windowingRunning;
             private ChannelWriter<CmdBase> _cmdWriter = default!;
             private ChannelReader<CmdBase> _cmdReader = default!;
@@ -53,7 +48,10 @@ namespace Robust.Client.Graphics.Clyde
 
                 while (_windowingRunning)
                 {
-                    if (IsMacOS)
+                    // glfwPostEmptyEvent is broken on macOS and crashes when not called from the main thread
+                    // (despite what the docs claim, and yes this makes it useless).
+                    // Because of this, we just forego it and use glfwWaitEventsTimeout on macOS instead.
+                    if (OperatingSystem.IsMacOS())
                         GLFW.WaitEventsTimeout(0.008);
                     else
                         GLFW.WaitEvents();
@@ -157,7 +155,7 @@ namespace Robust.Client.Graphics.Clyde
                 _cmdWriter.TryWrite(cmd);
 
                 // Post empty event to unstuck WaitEvents if necessary.
-                if (!IsMacOS)
+                if (!OperatingSystem.IsMacOS())
                     GLFW.PostEmptyEvent();
             }
 

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

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Runtime.Loader;
 using System.Threading.Tasks;
 using OpenToolkit;
 using OpenToolkit.Graphics.OpenGL4;
@@ -21,8 +22,7 @@ namespace Robust.Client.Graphics.Clyde
 {
     internal partial class Clyde
     {
-        // Wait for it.
-        private sealed partial class GlfwWindowingImpl
+        private unsafe sealed partial class GlfwWindowingImpl
         {
             private readonly List<GlfwWindowReg> _windows = new();
 
@@ -33,46 +33,25 @@ namespace Robust.Client.Graphics.Clyde
             private GlfwWindowReg? _mainWindow;
             private GlfwBindingsContext _mainGraphicsContext = default!;
             private int _nextWindowId = 1;
+            private static bool _eglLoaded;
 
-            public async Task<WindowHandle> WindowCreate(WindowCreateParameters parameters)
+            public WindowHandle WindowCreate(WindowCreateParameters parameters)
             {
-                // tfw await not allowed in unsafe contexts
-
-                // GL APIs don't take kindly to making a new window without unbinding the main context. Great.
-                // Leaving code for async path in, in case it works on like GLX.
-                var unbindContextAndBlock = true;
-
                 DebugTools.AssertNotNull(_mainWindow);
 
-                Task<GlfwWindowCreateResult> task;
-                unsafe
-                {
-                    if (unbindContextAndBlock)
-                        GLFW.MakeContextCurrent(null);
+                GLFW.MakeContextCurrent(null);
 
-                    task = SharedWindowCreate(
-                        _clyde._chosenRenderer,
-                        parameters,
-                        _mainWindow!.GlfwWindow);
-                }
+                var task = SharedWindowCreate(
+                    _clyde._chosenRenderer,
+                    parameters,
+                    _mainWindow!.GlfwWindow);
 
-                if (unbindContextAndBlock)
-                {
-                    unsafe
-                    {
-                        // Block the main thread (to avoid stuff like texture uploads being problematic).
-                        WaitWindowCreate(task);
+                // Block the main thread (to avoid stuff like texture uploads being problematic).
+                WaitWindowCreate(task);
 
-                        if (unbindContextAndBlock)
-                            GLFW.MakeContextCurrent(_mainWindow.GlfwWindow);
-                    }
-                }
-                else
-                {
-                    await task;
-                }
+                GLFW.MakeContextCurrent(_mainWindow.GlfwWindow);
 
-                var (reg, error) = await task;
+                var (reg, error) = task.Result;
 
                 if (reg == null)
                 {
@@ -83,18 +62,11 @@ namespace Robust.Client.Graphics.Clyde
                 _clyde.CreateWindowRenderTexture(reg);
                 _clyde.InitWindowBlitThread(reg);
 
-                unsafe
-                {
-                    GLFW.MakeContextCurrent(_mainWindow.GlfwWindow);
-                }
+                GLFW.MakeContextCurrent(_mainWindow.GlfwWindow);
 
                 return reg.Handle;
             }
-        }
 
-        // Yes, you read that right.
-        private sealed unsafe partial class GlfwWindowingImpl
-        {
             public bool TryInitMainWindow(Renderer renderer, [NotNullWhen(false)] out string? error)
             {
                 var width = _cfg.GetCVar(CVars.DisplayWidth);
@@ -165,6 +137,21 @@ namespace Robust.Client.Graphics.Clyde
                 WindowCreateParameters parameters,
                 Window* share)
             {
+                //
+                // IF YOU'RE WONDERING WHY THIS IS TASK-BASED:
+                // I originally wanted this to be async so we could avoid blocking the main thread
+                // while the OS takes its stupid 100~ms just to initialize a fucking GL context.
+                // This doesn't *work* because
+                // we have to release the GL context while the shared context is being created.
+                // (at least on WGL, I didn't test other platforms and I don't care to.)
+                // Not worth it to avoid a main thread blockage by allowing Clyde to temporarily release the GL context,
+                // because rendering would be locked up *anyways*.
+                //
+                // Basically what I'm saying is that everything about OpenGL is a fucking mistake
+                // and I should get on either Veldrid or Vulkan some time.
+                // Probably Veldrid tbh.
+                //
+
                 // Yes we ping-pong this TCS through the window thread and back, deal with it.
                 var tcs = new TaskCompletionSource<GlfwWindowCreateResult>();
                 SendCmd(new CmdWinCreate(
@@ -474,6 +461,20 @@ namespace Robust.Client.Graphics.Clyde
                     GLFW.WindowHint(WindowHintContextApi.ContextCreationApi, ContextApi.EglContextApi);
                     GLFW.WindowHint(WindowHintOpenGlProfile.OpenGlProfile, OpenGlProfile.Any);
                     GLFW.WindowHint(WindowHintBool.SrgbCapable, false);
+
+                    if (!_eglLoaded && OperatingSystem.IsWindows())
+                    {
+                        // On non-published builds (so, development), GLFW can't find libEGL.dll
+                        // because it'll be in runtimes/<rid>/native/ instead of next to the actual executable.
+                        // We manually preload the library here so that GLFW will find it when it does its thing.
+                        NativeLibrary.TryLoad(
+                            "libEGL.dll",
+                            typeof(Clyde).Assembly,
+                            DllImportSearchPath.SafeDirectories,
+                            out _);
+
+                        _eglLoaded = true;
+                    }
                 }
 
 
@@ -492,6 +493,10 @@ namespace Robust.Client.Graphics.Clyde
                     parameters.Fullscreen ? monitor : null,
                     contextShare);
 
+                // Check if window failed to create.
+                if (window == null)
+                    return null;
+
                 if (parameters.Maximized)
                 {
                     GLFW.GetMonitorPos(monitor, out var x, out var y);
@@ -505,7 +510,6 @@ namespace Robust.Client.Graphics.Clyde
                 }
 
 
-
                 return window;
             }
 

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

@@ -38,7 +38,7 @@ namespace Robust.Client.Graphics.Clyde
             void WindowRequestAttention(WindowReg window);
             void WindowSwapBuffers(WindowReg window);
             uint? WindowGetX11Id(WindowReg window);
-            Task<WindowHandle> WindowCreate(WindowCreateParameters parameters);
+            WindowHandle WindowCreate(WindowCreateParameters parameters);
             void WindowDestroy(WindowReg reg);
 
             string KeyGetName(Keyboard.Key key);

Robust.Client/Graphics/Drawing/DrawingHandleScreen.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text;
 using Robust.Shared.Maths;
 
 namespace Robust.Client.Graphics
@@ -39,5 +40,57 @@ namespace Robust.Client.Graphics
             DrawPrimitiveTopology type = filled ? DrawPrimitiveTopology.TriangleFan : DrawPrimitiveTopology.LineStrip;
             DrawPrimitives(type, buffer, color);
         }
+
+        /// <summary>
+        ///     Draw a simple string to the screen at the specified position.
+        /// </summary>
+        /// <remarks>
+        ///     This method is primarily intended for debug purposes and does not handle things like UI scaling.
+        /// </remarks>
+        /// <returns>
+        ///     The space taken up (horizontal and vertical) by the text.
+        /// </returns>
+        /// <param name="font">The font to render with.</param>
+        /// <param name="pos">The top-left corner to start drawing text at.</param>
+        /// <param name="str">The text to draw.</param>
+        /// <param name="color">The color of text to draw.</param>
+        public Vector2 DrawString(Font font, Vector2 pos, string str, Color color)
+        {
+            var advanceTotal = Vector2.Zero;
+            var baseLine = new Vector2(pos.X, font.GetAscent(1) + pos.Y);
+            var lineHeight = font.GetLineHeight(1);
+
+            foreach (var rune in str.EnumerateRunes())
+            {
+                if (rune == new Rune('\n'))
+                {
+                    baseLine.X = pos.X;
+                    baseLine.Y += lineHeight;
+                    advanceTotal.Y += lineHeight;
+                    continue;
+                }
+
+                var advance = font.DrawChar(this, rune, baseLine, 1, color);
+                advanceTotal.X += advance;
+                baseLine += new Vector2(advance, 0);
+            }
+
+            return advanceTotal;
+        }
+
+        /// <summary>
+        ///     Draw a simple string to the screen at the specified position.
+        /// </summary>
+        /// <remarks>
+        ///     This method is primarily intended for debug purposes and does not handle things like UI scaling.
+        /// </remarks>
+        /// <returns>
+        ///     The space taken up (horizontal and vertical) by the text.
+        /// </returns>
+        /// <param name="font">The font to render with.</param>
+        /// <param name="pos">The top-left corner to start drawing text at.</param>
+        /// <param name="str">The text to draw.</param>
+        public Vector2 DrawString(Font font, Vector2 pos, string str)
+            => DrawString(font, pos, str, Color.White);
     }
 }

Robust.Client/Graphics/IClyde.cs

@@ -130,6 +130,6 @@ namespace Robust.Client.Graphics
 
         IEnumerable<IClydeMonitor> EnumerateMonitors();
 
-        Task<IClydeWindow> CreateWindow(WindowCreateParameters parameters);
+        IClydeWindow CreateWindow(WindowCreateParameters parameters);
     }
 }

Robust.Client/Graphics/IClydeAudio.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using Robust.Client.Audio;
 
 namespace Robust.Client.Graphics
@@ -8,6 +9,7 @@ namespace Robust.Client.Graphics
         // AUDIO SYSTEM DOWN BELOW.
         AudioStream LoadAudioOggVorbis(Stream stream, string? name = null);
         AudioStream LoadAudioWav(Stream stream, string? name = null);
+        AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null);
 
         void SetMasterVolume(float newVolume);
 

Robust.Client/Graphics/IClydeAudioSource.cs

@@ -18,6 +18,7 @@ namespace Robust.Client.Graphics
         void SetPitch(float pitch);
         void SetGlobal();
         void SetVolume(float decibels);
+        void SetVolumeDirect(float decibels);
         void SetOcclusion(float blocks);
         void SetPlaybackPosition(float seconds);
         void SetVelocity(Vector2 velocity);

Robust.Client/Graphics/IClydeMonitor.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.Maths;
+using System.Collections.Generic;
+using Robust.Shared.Maths;
 
 namespace Robust.Client.Graphics
 {
@@ -14,5 +15,7 @@ namespace Robust.Client.Graphics
         string Name { get; }
         Vector2i Size { get; }
         int RefreshRate { get; }
+
+        IEnumerable<VideoMode> VideoModes { get; }
     }
 }

Robust.Client/Graphics/VideoMode.cs

@@ -0,0 +1,12 @@
+namespace Robust.Client.Graphics
+{
+    public struct VideoMode
+    {
+        public ushort Width;
+        public ushort Height;
+        public ushort RefreshRate;
+        public byte RedBits;
+        public byte BlueBits;
+        public byte GreenBits;
+    }
+}

Robust.Client/IGameControllerInternal.cs

@@ -10,8 +10,7 @@ namespace Robust.Client
         GameControllerOptions Options { get; }
         bool ContentStart { get; set; }
         void SetCommandLineArgs(CommandLineArgs args);
-        bool LoadConfigAndUserData { get; set; }
-        void Run(GameController.DisplayMode mode, Func<ILogHandler>? logHandlerFactory = null);
+        void Run(GameController.DisplayMode mode, GameControllerOptions options, Func<ILogHandler>? logHandlerFactory = null);
         void KeyDown(KeyEventArgs keyEvent);
         void KeyUp(KeyEventArgs keyEvent);
         void TextEntered(TextEventArgs textEvent);

Robust.Client/Input/InputDevices.cs

@@ -1,7 +1,6 @@
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
+using System;
+using System.Collections.Generic;
 using Robust.Shared.Localization;
-using Robust.Shared.Map;
 
 namespace Robust.Client.Input
 {
@@ -179,9 +178,9 @@ namespace Robust.Client.Input
             var locId = $"input-key-{key}";
             if (key == Key.LSystem || key == Key.RSystem)
             {
-                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                if (OperatingSystem.IsWindows())
                     locId += "-win";
-                else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+                else if (OperatingSystem.IsMacOS())
                     locId += "-mac";
                 else
                     locId += "-linux";

Robust.Client/Input/InputManager.cs

@@ -16,11 +16,12 @@ using Robust.Shared.IoC;
 using Robust.Shared.Localization;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
-using Robust.Shared.Maths;
 using Robust.Shared.Reflection;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Serialization.Markdown.Mapping;
+using Robust.Shared.Serialization.Markdown.Value;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 using YamlDotNet.Core;
@@ -145,13 +146,13 @@ namespace Robust.Client.Input
                 .Where(p => _bindingsByFunction[p].Count == 0)
                 .ToArray();
 
-            mapping.AddNode("version", new ValueDataNode("1"));
-            mapping.AddNode("binds", serializationManager.WriteValue(modifiedBindings));
-            mapping.AddNode("leaveEmpty", serializationManager.WriteValue(leaveEmpty));
+            mapping.Add("version", new ValueDataNode("1"));
+            mapping.Add("binds", serializationManager.WriteValue(modifiedBindings));
+            mapping.Add("leaveEmpty", serializationManager.WriteValue(leaveEmpty));
 
             var path = new ResourcePath(KeybindsPath);
             using var writer = new StreamWriter(_resourceMan.UserData.Create(path));
-            var stream = new YamlStream {new(mapping.ToMappingNode())};
+            var stream = new YamlStream {new(mapping.ToYaml())};
             stream.Save(new YamlMappingFix(new Emitter(writer)), false);
         }
 
@@ -333,6 +334,7 @@ namespace Robust.Client.Input
         {
             // christ this crap *is* re-entrant thanks to PlacementManager and
             // I honestly have no idea what the best solution here is.
+            // note from the future: context switches won't cause re-entrancy anymore because InputContextContainer defers context switches
             DebugTools.Assert(!_currentlyFindingViewport, "Re-entrant key events??");
 
             try
@@ -340,6 +342,8 @@ namespace Robust.Client.Input
                 // This is terrible but anyways.
                 // This flag keeps track of "did a viewport fire the key up for us" so we know we don't do it again.
                 _currentlyFindingViewport = true;
+                // And this stops context switches from causing crashes
+                Contexts.DeferringEnabled = true;
 
                 binding.State = state;
 
@@ -360,12 +364,14 @@ namespace Robust.Client.Input
             finally
             {
                 _currentlyFindingViewport = false;
+                Contexts.DeferringEnabled = false;
             }
         }
 
         public void ViewportKeyEvent(Control? viewport, BoundKeyEventArgs eventArgs)
         {
             _currentlyFindingViewport = false;
+            Contexts.DeferringEnabled = false;
 
             var cmd = GetInputCommand(eventArgs.Function);
             // TODO: Allow input commands to still get forwarded to server if necessary.
@@ -453,7 +459,7 @@ namespace Robust.Client.Input
             var robustMapping = mapping.ToDataNode() as MappingDataNode;
             if (robustMapping == null) throw new InvalidOperationException();
 
-            if (robustMapping.TryGetNode("binds", out var BaseKeyRegsNode))
+            if (robustMapping.TryGet("binds", out var BaseKeyRegsNode))
             {
                 var baseKeyRegs = serializationManager.ReadValueOrThrow<KeyBindingRegistration[]>(BaseKeyRegsNode);
 
@@ -482,7 +488,7 @@ namespace Robust.Client.Input
                 }
             }
 
-            if (userData && robustMapping.TryGetNode("leaveEmpty", out var node))
+            if (userData && robustMapping.TryGet("leaveEmpty", out var node))
             {
                 var leaveEmpty = serializationManager.ReadValueOrThrow<BoundKeyFunction[]>(node);
 

Robust.Client/Map/ClientMapManager.cs

@@ -1,72 +1,111 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
-using Robust.Shared.IoC;
-using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
-using Robust.Shared.Network;
 using Robust.Shared.Utility;
 
 namespace Robust.Client.Map
 {
     internal class ClientMapManager : MapManager, IClientMapManager
     {
-        [Dependency] private readonly INetManager _netManager = default!;
-
-        public void ApplyGameStatePre(GameStateMapData? data)
+        public void ApplyGameStatePre(GameStateMapData? data, EntityState[]? entityStates)
         {
             // There was no map data this tick, so nothing to do.
             if(data == null)
                 return;
 
-            var createdGrids = data.CreatedGrids != null
-                ? new Dictionary<GridId, GameStateMapData.GridCreationDatum>(data.CreatedGrids)
-                : null;
-
             // First we need to figure out all the NEW MAPS.
             if(data.CreatedMaps != null)
             {
+                DebugTools.Assert(entityStates is not null, "Received new maps, but no entity state.");
+
                 foreach (var mapId in data.CreatedMaps)
                 {
+                    // map already exists from a previous state.
                     if (_maps.Contains(mapId))
-                    {
                         continue;
-                    }
 
-                    CreateMap(mapId);
+                    EntityUid mapEuid = default;
+
+                    //get shared euid of map comp entity
+                    foreach (var entityState in entityStates!)
+                    {
+                        if(entityState.ComponentChanges is null)
+                            continue;
+
+                        foreach (var compChange in entityState.ComponentChanges)
+                        {
+                            if (compChange.State is not MapComponentState mapCompState || mapCompState.MapId != mapId)
+                                continue;
+
+                            mapEuid = entityState.Uid;
+                            goto BreakMapEntSearch;
+                        }
+                    }
+                    BreakMapEntSearch:
+
+                    DebugTools.Assert(mapEuid != default, $"Could not find corresponding entity state for new map {mapId}.");
+
+                    CreateMap(mapId, mapEuid);
                 }
             }
 
             // Then make all the grids.
             if(data.CreatedGrids != null)
             {
-                var gridData = data.GridData != null
-                    ? new Dictionary<GridId, GameStateMapData.GridDatum>(data.GridData)
-                    : null;
-
-                DebugTools.AssertNotNull(createdGrids);
+                DebugTools.Assert(data.GridData is not null, "Received new grids, but GridData was null.");
 
                 foreach (var (gridId, creationDatum) in data.CreatedGrids)
                 {
                     if (_grids.ContainsKey(gridId))
-                    {
                         continue;
+
+                    EntityUid gridEuid = default;
+
+                    //get shared euid of map comp entity
+                    foreach (var entityState in entityStates!)
+                    {
+                        if (entityState.ComponentChanges is null)
+                            continue;
+
+                        foreach (var compState in entityState.ComponentChanges)
+                        {
+                            if (compState.State is not MapGridComponentState gridCompState || gridCompState.GridIndex != gridId)
+                                continue;
+
+                            gridEuid = entityState.Uid;
+                            goto BreakGridEntSearch;
+                        }
+                    }
+                    BreakGridEntSearch:
+
+                    DebugTools.Assert(gridEuid != default, $"Could not find corresponding entity state for new grid {gridId}.");
+
+                    MapId gridMapId = default;
+                    foreach (var kvData in data.GridData!)
+                    {
+                        if (kvData.Key != gridId)
+                            continue;
+
+                        gridMapId = kvData.Value.Coordinates.MapId;
+                        break;
                     }
 
-                    CreateGrid(gridData![gridId].Coordinates.MapId, gridId, creationDatum.ChunkSize);
+                    DebugTools.Assert(gridMapId != default, $"Could not find corresponding gridData for new grid {gridId}.");
+
+                    CreateGrid(gridMapId, gridId, creationDatum.ChunkSize, gridEuid);
                 }
             }
 
+            // Process all grid updates.
             if(data.GridData != null)
             {
                 SuppressOnTileChanged = true;
                 // Ok good all the grids and maps exist now.
                 foreach (var (gridId, gridDatum) in data.GridData)
                 {
-
                     var grid = _grids[gridId];
                     if (grid.ParentMapId != gridDatum.Coordinates.MapId)
                     {
@@ -112,99 +151,9 @@ namespace Robust.Client.Map
 
         public void ApplyGameStatePost(GameStateMapData? data)
         {
-            DebugTools.Assert(_netManager.IsClient, "Only the client should call this.");
-
             if(data == null) // if there is no data, there is nothing to do!
                 return;
 
-            // maps created on the client in pre-state are linked to client entities
-            // resolve new maps with their shared component that the server just gave us
-            // and delete the client entities
-            if (data.CreatedMaps != null)
-            {
-                foreach (var mapId in data.CreatedMaps)
-                {
-                    // CreateMap should have set this
-                    DebugTools.Assert(_mapEntities.ContainsKey(mapId));
-
-                    // this was already linked in a previous state.
-                    if(!_mapEntities[mapId].IsClientSide())
-                        continue;
-
-                    // get the existing client entity for the map.
-                    var cEntity = EntityManager.GetEntity(_mapEntities[mapId]);
-
-                    // locate the entity that represents this map that was just sent to us
-                    IEntity? sharedMapEntity = null;
-                    var mapComps = EntityManager.ComponentManager.EntityQuery<IMapComponent>(true);
-                    foreach (var mapComp in mapComps)
-                    {
-                        if (!mapComp.Owner.Uid.IsClientSide() && mapComp.WorldMap == mapId)
-                        {
-                            sharedMapEntity = mapComp.Owner;
-                            _mapEntities[mapId] = mapComp.Owner.Uid;
-                            Logger.DebugS("map", $"Map {mapId} pivoted bound entity from {cEntity.Uid} to {mapComp.Owner.Uid}.");
-                            break;
-                        }
-                    }
-
-                    // verify shared entity was found (the server sent us one)
-                    DebugTools.AssertNotNull(sharedMapEntity);
-                    DebugTools.Assert(!_mapEntities[mapId].IsClientSide());
-
-                    // Transfer client child grids made in GameStatePre to the shared component
-                    // so they are not deleted
-                    foreach (var childGridTrans in cEntity.Transform.Children.ToList())
-                    {
-                        childGridTrans.AttachParent(sharedMapEntity!);
-                    }
-
-                    // remove client entity
-                    var cGridComp = cEntity.GetComponent<IMapComponent>();
-                    cGridComp.ClearMapId();
-                    cEntity.Delete();
-                }
-            }
-
-
-            // grids created on the client in pre-state are linked to client entities
-            // resolve new grids with their shared component that the server just gave us
-            // and delete the client entities
-            if (data.CreatedGrids != null)
-            {
-                foreach (var kvNewGrid in data.CreatedGrids)
-                {
-                    var grid = _grids[kvNewGrid.Key];
-
-                    // this was already linked in a previous state.
-                    if(!grid.GridEntityId.IsClientSide())
-                        continue;
-
-                    // remove the existing client entity.
-                    var cEntity = EntityManager.GetEntity(grid.GridEntityId);
-                    var cGridComp = cEntity.GetComponent<IMapGridComponent>();
-
-                    // prevents us from deleting the grid when deleting the grid entity
-                    if(cEntity.Uid.IsClientSide())
-                        cGridComp.ClearGridId();
-
-                    cEntity.Delete(); // normal entities are already parented to the shared comp, client comp has no children
-
-                    var gridComps = EntityManager.ComponentManager.EntityQuery<IMapGridComponent>(true);
-                    foreach (var gridComp in gridComps)
-                    {
-                        if (gridComp.GridIndex == kvNewGrid.Key)
-                        {
-                            grid.GridEntityId = gridComp.Owner.Uid;
-                            Logger.DebugS("map", $"Grid {grid.Index} pivoted bound entity from {cEntity.Uid} to {grid.GridEntityId}.");
-                            break;
-                        }
-                    }
-
-                    DebugTools.Assert(!grid.GridEntityId.IsClientSide());
-                }
-            }
-
             if(data.DeletedGrids != null)
             {
                 foreach (var grid in data.DeletedGrids)

Robust.Client/Map/ClydeTileDefinitionManager.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
@@ -7,6 +8,7 @@ using Robust.Client.Utility;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
+using Robust.Shared.Utility;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
 
@@ -17,7 +19,7 @@ namespace Robust.Client.Map
         [Dependency] private readonly IResourceCache _resourceCache = default!;
 
         private Texture? _tileTextureAtlas;
-        
+
         public Texture TileTextureAtlas => _tileTextureAtlas ?? Texture.Transparent;
 
         private readonly Dictionary<ushort, Box2> _tileRegions = new();
@@ -61,7 +63,7 @@ namespace Robust.Client.Map
                 var row = i / dimensionX;
 
                 Image<Rgba32> image;
-                using (var stream = _resourceCache.ContentFileRead($"/Textures/Constructible/Tiles/{def.SpriteName}.png"))
+                using (var stream = _resourceCache.ContentFileRead(new ResourcePath(def.Path) / $"{def.SpriteName}.png"))
                 {
                     image = Image.Load<Rgba32>(stream);
                 }

Robust.Client/Map/IClientMapManager.cs

@@ -1,3 +1,4 @@
+using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
 using Robust.Shared.Map;
 
@@ -7,7 +8,7 @@ namespace Robust.Client.Map
     {
         // Two methods here, so that new grids etc can be made BEFORE entities get states applied,
         // but old ones can be deleted after.
-        void ApplyGameStatePre(GameStateMapData? data);
+        void ApplyGameStatePre(GameStateMapData? data, EntityState[]? entityStates);
         void ApplyGameStatePost(GameStateMapData? data);
     }
 }

Robust.Client/Physics/DebugPhysicsIslandSystem.cs

@@ -52,7 +52,7 @@ namespace Robust.Client.Physics
         public override void Shutdown()
         {
             base.Shutdown();
-            UnsubscribeLocalEvent<IslandSolveMessage>();
+
             IoCManager.Resolve<IOverlayManager>().RemoveOverlay(typeof(PhysicsIslandOverlay));
         }
 

Robust.Client/Placement/PlacementManager.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Robust.Client.GameObjects;
@@ -25,7 +25,6 @@ namespace Robust.Client.Placement
 {
     public partial class PlacementManager : IPlacementManager, IDisposable
     {
-        [Dependency] public readonly IPhysicsManager PhysicsManager = default!;
         [Dependency] private readonly IClientNetManager NetworkManager = default!;
         [Dependency] public readonly IPlayerManager PlayerManager = default!;
         [Dependency] public readonly IResourceCache ResourceCache = default!;
@@ -156,7 +155,7 @@ namespace Robust.Client.Placement
         {
             _drawingShader = _prototypeManager.Index<ShaderPrototype>("unshaded").Instance();
 
-            NetworkManager.RegisterNetMessage<MsgPlacement>(MsgPlacement.NAME, HandlePlacementMessage);
+            NetworkManager.RegisterNetMessage<MsgPlacement>(HandlePlacementMessage);
 
             _modeDictionary.Clear();
             foreach (var type in ReflectionManager.GetAllChildren<PlacementMode>())
@@ -505,8 +504,8 @@ namespace Robust.Client.Placement
                     coordinates = new EntityCoordinates();
                     return false;
                 }
-                coordinates = EntityCoordinates.FromMap(ent.EntityManager, MapManager,
-                    eyeManager.ScreenToMap(_inputManager.MouseScreenPosition));
+                coordinates = EntityCoordinates.FromMap(MapManager,
+                                                        eyeManager.ScreenToMap(_inputManager.MouseScreenPosition));
                 return true;
             }
         }

Robust.Client/Placement/PlacementMode.cs

@@ -250,7 +250,7 @@ namespace Robust.Client.Placement
             var mapCoords = pManager.eyeManager.ScreenToMap(coords.Position);
             if (!pManager.MapManager.TryFindGridAt(mapCoords, out var grid))
             {
-                return EntityCoordinates.FromMap(pManager.EntityManager, pManager.MapManager, mapCoords);
+                return EntityCoordinates.FromMap(pManager.MapManager, mapCoords);
             }
 
             return EntityCoordinates.FromMap(pManager.EntityManager, grid.GridEntityId, mapCoords);

Robust.Client/Player/IPlayerManager.cs

@@ -2,13 +2,14 @@ using System;
 using System.Collections.Generic;
 using Robust.Shared.GameStates;
 using Robust.Shared.Network;
+using Robust.Shared.Players;
 
 namespace Robust.Client.Player
 {
     public interface IPlayerManager : Shared.Players.ISharedPlayerManager
     {
-        new IEnumerable<IPlayerSession> Sessions { get; }
-        IReadOnlyDictionary<NetUserId, IPlayerSession> SessionsDict { get; }
+        new IEnumerable<ICommonSession> Sessions { get; }
+        IReadOnlyDictionary<NetUserId, ICommonSession> SessionsDict { get; }
 
         LocalPlayer? LocalPlayer { get; }
 

Robust.Client/Player/IPlayerSession.cs

@@ -1,11 +0,0 @@
-using System;
-using Robust.Shared.Players;
-
-namespace Robust.Client.Player
-{
-    /// <summary>
-    /// Client side session of a player.
-    /// </summary>
-    [Obsolete("Use the base " + nameof(ICommonSession))]
-    public interface IPlayerSession : ICommonSession { }
-}

Robust.Client/Player/LocalPlayer.cs

@@ -1,9 +1,9 @@
-using System;
+using System;
 using Robust.Client.GameObjects;
-using Robust.Shared.Configuration;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Network;
+using Robust.Shared.Players;
 using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.Player
@@ -36,7 +36,7 @@ namespace Robust.Client.Player
         ///     Session of the local client.
         /// </summary>
         [ViewVariables]
-        public IPlayerSession Session => InternalSession;
+        public ICommonSession Session => InternalSession;
 
         internal PlayerSession InternalSession { get; set; } = default!;
 
@@ -70,10 +70,10 @@ namespace Robust.Client.Player
             eye.Current = true;
 
             EntityAttached?.Invoke(new EntityAttachedEventArgs(entity));
-            entity.SendMessage(null, new PlayerAttachedMsg());
 
             // notify ECS Systems
             ControlledEntity.EntityManager.EventBus.RaiseEvent(EventSource.Local, new PlayerAttachSysMessage(ControlledEntity));
+            ControlledEntity.EntityManager.EventBus.RaiseLocalEvent(ControlledEntity.Uid, new PlayerAttachedEvent(ControlledEntity));
         }
 
         /// <summary>
@@ -82,13 +82,13 @@ namespace Robust.Client.Player
         public void DetachEntity()
         {
             var previous = ControlledEntity;
-            if (previous != null && previous.Initialized && !previous.Deleted)
+            if (previous is {Initialized: true, Deleted: false})
             {
                 previous.GetComponent<EyeComponent>().Current = false;
-                previous.SendMessage(null, new PlayerDetachedMsg());
 
                 // notify ECS Systems
                 previous.EntityManager.EventBus.RaiseEvent(EventSource.Local, new PlayerAttachSysMessage(null));
+                previous.EntityManager.EventBus.RaiseLocalEvent(previous.Uid, new PlayerDetachedEvent(previous));
             }
 
             ControlledEntity = null;

Robust.Client/Player/PlayerManager.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using Robust.Shared.Configuration;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
@@ -28,7 +27,7 @@ namespace Robust.Client.Player
         /// <summary>
         ///     Active sessions of connected clients to the server.
         /// </summary>
-        private readonly Dictionary<NetUserId, IPlayerSession> _sessions = new();
+        private readonly Dictionary<NetUserId, ICommonSession> _sessions = new();
 
         /// <inheritdoc />
         public IEnumerable<ICommonSession> NetworkedSessions
@@ -69,10 +68,10 @@ namespace Robust.Client.Player
 
         /// <inheritdoc />
         [ViewVariables]
-        IEnumerable<IPlayerSession> IPlayerManager.Sessions => _sessions.Values;
+        IEnumerable<ICommonSession> IPlayerManager.Sessions => _sessions.Values;
 
         /// <inheritdoc />
-        public IReadOnlyDictionary<NetUserId, IPlayerSession> SessionsDict => _sessions;
+        public IReadOnlyDictionary<NetUserId, ICommonSession> SessionsDict => _sessions;
 
         /// <inheritdoc />
         public event EventHandler? PlayerListUpdated;
@@ -82,8 +81,8 @@ namespace Robust.Client.Player
         {
             _client.RunLevelChanged += OnRunLevelChanged;
 
-            _network.RegisterNetMessage<MsgPlayerListReq>(MsgPlayerListReq.NAME);
-            _network.RegisterNetMessage<MsgPlayerList>(MsgPlayerList.NAME, HandlePlayerList);
+            _network.RegisterNetMessage<MsgPlayerListReq>();
+            _network.RegisterNetMessage<MsgPlayerList>(HandlePlayerList);
         }
 
         /// <inheritdoc />

Robust.Client/Player/PlayerSession.cs

@@ -5,9 +5,8 @@ using Robust.Shared.Players;
 
 namespace Robust.Client.Player
 {
-    internal sealed class PlayerSession : IPlayerSession
+    internal sealed class PlayerSession : ICommonSession
     {
-        /// <inheritdoc />
         internal SessionStatus Status { get; set; } = SessionStatus.Connecting;
 
         /// <inheritdoc />
@@ -26,17 +25,15 @@ namespace Robust.Client.Player
         /// <inheritdoc />
         public NetUserId UserId { get; }
 
-        /// <inheritdoc cref="IPlayerSession" />
         internal string Name { get; set; } = "<Unknown>";
 
-        /// <inheritdoc cref="IPlayerSession" />
+        /// <inheritdoc />
         string ICommonSession.Name
         {
             get => this.Name;
             set => this.Name = value;
         }
 
-        /// <inheritdoc />
         internal short Ping { get; set; }
 
         /// <inheritdoc />
@@ -51,7 +48,7 @@ namespace Robust.Client.Player
 
         /// <summary>
         ///     Creates an instance of a PlayerSession.
-        /// </summary
+        /// </summary>
         public PlayerSession(NetUserId user)
         {
             UserId = user;

Robust.Client/Prototypes/ClientPrototypeManager.cs

@@ -30,7 +30,7 @@ namespace Robust.Client.Prototypes
         {
             base.Initialize();
 
-            _netManager.RegisterNetMessage<MsgReloadPrototypes>(MsgReloadPrototypes.NAME, accept: NetMessageAccept.Server);
+            _netManager.RegisterNetMessage<MsgReloadPrototypes>(accept: NetMessageAccept.Server);
 
             _clyde.OnWindowFocused += WindowFocusedChanged;
 

Robust.Client/Serialization/AppearanceVisualizerSerializer.cs

@@ -6,7 +6,9 @@ using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Serialization.Manager.Result;
 using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Serialization.Markdown.Mapping;
 using Robust.Shared.Serialization.Markdown.Validation;
+using Robust.Shared.Serialization.Markdown.Value;
 using Robust.Shared.Serialization.TypeSerializers.Interfaces;
 
 namespace Robust.Client.Serialization
@@ -19,7 +21,7 @@ namespace Robust.Client.Serialization
             bool skipHook,
             ISerializationContext? context = null)
         {
-            if (!node.TryGetNode("type", out var typeNode))
+            if (!node.TryGet("type", out var typeNode))
                 throw new InvalidMappingException("No type specified for AppearanceVisualizer!");
 
             if (typeNode is not ValueDataNode typeValueDataNode)
@@ -32,7 +34,7 @@ namespace Robust.Client.Serialization
                     $"Invalid type {typeValueDataNode.Value} specified for AppearanceVisualizer!");
 
             var newNode = (MappingDataNode)node.Copy();
-            newNode.RemoveNode("type");
+            newNode.Remove("type");
             return serializationManager.Read(type, newNode, context, skipHook);
         }
 
@@ -40,7 +42,7 @@ namespace Robust.Client.Serialization
             IDependencyCollection dependencies,
             ISerializationContext? context)
         {
-            if (!node.TryGetNode("type", out var typeNode) || typeNode is not ValueDataNode valueNode)
+            if (!node.TryGet("type", out var typeNode) || typeNode is not ValueDataNode valueNode)
             {
                 return new ErrorNode(node, "Missing/Invalid type", true);
             }
@@ -53,14 +55,14 @@ namespace Robust.Client.Serialization
                 return new ErrorNode(node, $"Failed to resolve type: {valueNode.Value}", true);
             }
 
-            return serializationManager.ValidateNode(type, node.CopyCast<MappingDataNode>().RemoveNode("type"));
+            return serializationManager.ValidateNode(type, node.CopyCast<MappingDataNode>().Remove("type"));
         }
 
         public DataNode Write(ISerializationManager serializationManager, AppearanceVisualizer value, bool alwaysWrite = false,
             ISerializationContext? context = null)
         {
             var mapping = serializationManager.WriteValueAs<MappingDataNode>(value.GetType(), value, alwaysWrite, context);
-            mapping.AddNode("type", new ValueDataNode(value.GetType().Name));
+            mapping.Add("type", new ValueDataNode(value.GetType().Name));
             return mapping;
         }
 

Robust.Client/UserInterface/Controls/BoxContainer.cs

@@ -6,20 +6,31 @@ namespace Robust.Client.UserInterface.Controls
 {
     /// <summary>
     ///     A container that lays out its children sequentially.
-    ///     Use <see cref="VBoxContainer"/> or <see cref="HBoxContainer"/> for an implementation.
     /// </summary>
-    public abstract class BoxContainer : Container
+    public class BoxContainer : Container
     {
+        private LayoutOrientation _orientation;
         public const string StylePropertySeparation = "separation";
 
         private const int DefaultSeparation = 0;
-        private protected abstract bool Vertical { get; }
 
         /// <summary>
         ///     Specifies "where" the controls should be laid out.
         /// </summary>
         public AlignMode Align { get; set; }
 
+        private bool Vertical => Orientation == LayoutOrientation.Vertical;
+
+        public LayoutOrientation Orientation
+        {
+            get => _orientation;
+            set
+            {
+                _orientation = value;
+                InvalidateMeasure();
+            }
+        }
+
         private int ActualSeparation
         {
             get
@@ -237,5 +248,11 @@ namespace Robust.Client.UserInterface.Controls
             /// </summary>
             End = 2
         }
+
+        public enum LayoutOrientation : byte
+        {
+            Horizontal,
+            Vertical
+        }
     }
 }

Robust.Client/UserInterface/Controls/Button.cs

@@ -10,7 +10,7 @@ namespace Robust.Client.UserInterface.Controls
     {
         public Label Label { get; }
 
-        public Button() : base()
+        public Button()
         {
             AddStyleClass(StyleClassButton);
             Label = new Label

Robust.Client/UserInterface/Controls/CheckBox.cs

@@ -14,12 +14,13 @@ namespace Robust.Client.UserInterface.Controls
         public Label Label { get; }
         public TextureRect TextureRect { get; }
 
-        public CheckBox() : base()
+        public CheckBox()
         {
             ToggleMode = true;
 
-            var hBox = new HBoxContainer
+            var hBox = new BoxContainer
             {
+                Orientation = BoxContainer.LayoutOrientation.Horizontal,
                 StyleClasses = { StyleClassCheckBox },
             };
             AddChild(hBox);

Robust.Client/UserInterface/Controls/ContainerButton.cs

@@ -13,7 +13,7 @@ namespace Robust.Client.UserInterface.Controls
         public const string StylePseudoClassHover = "hover";
         public const string StylePseudoClassDisabled = "disabled";
 
-        public ContainerButton() : base()
+        public ContainerButton()
         {
             DrawModeChanged();
         }

Robust.Client/UserInterface/Controls/HBoxContainer.cs

@@ -1,10 +1,16 @@
-namespace Robust.Client.UserInterface.Controls
+using System;
+
+namespace Robust.Client.UserInterface.Controls
 {
     /// <summary>
     ///     Container that lays its children out horizontally: from left to right.
     /// </summary>
+    [Obsolete("Use BoxContainer and set Orientation instead")]
     public class HBoxContainer : BoxContainer
     {
-        private protected override bool Vertical => false;
+        public HBoxContainer()
+        {
+            Orientation = LayoutOrientation.Horizontal;
+        }
     }
 }

Robust.Client/UserInterface/Controls/HSplitContainer.cs

@@ -1,7 +1,13 @@
+using System;
+
 namespace Robust.Client.UserInterface.Controls
 {
+    [Obsolete("Use SplitContainer directly and set Orientation")]
     public class HSplitContainer : SplitContainer
     {
-        private protected sealed override bool Vertical => false;
+        public HSplitContainer()
+        {
+            Orientation = SplitOrientation.Horizontal;
+        }
     }
 }