Version: 0.19.2.0

* Fix grid deletion crashing

* polite

* a

* excellent

.github/CODEOWNERS

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

.github/workflows/benchmarks.yml

@@ -0,0 +1,35 @@
+name: Benchmarks
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 5 * * *'
+  push:
+    tags:
+      - 'v*'
+
+concurrency: benchmarks
+
+env:
+  ROBUST_BENCHMARKS_ENABLE_SQL: 1
+  ROBUST_BENCHMARKS_SQL_ADDRESS: ${{ secrets.BENCHMARKS_WRITE_ADDRESS }}
+  ROBUST_BENCHMARKS_SQL_PORT: ${{ secrets.BENCHMARKS_WRITE_PORT }}
+  ROBUST_BENCHMARKS_SQL_USER: ${{ secrets.BENCHMARKS_WRITE_USER }}
+  ROBUST_BENCHMARKS_SQL_PASSWORD: ${{ secrets.BENCHMARKS_WRITE_PASSWORD }}
+  ROBUST_BENCHMARKS_SQL_DATABASE: benchmarks
+
+jobs:
+  benchmark:
+    name: Run Benchmarks
+    runs-on: ubuntu-latest
+    steps:
+    - name: Run script on centcomm
+      uses: appleboy/ssh-action@master
+      with:
+        host: centcomm.spacestation14.io
+        username: robust-benchmark-runner
+        key: ${{ secrets.CENTCOMM_ROBUST_BENCHMARK_RUNNER_KEY }}
+        command_timeout: 100000m 
+        script: |
+          wget https://raw.githubusercontent.com/space-wizards/RobustToolbox/${{ github.sha }}/Tools/run_benchmarks.py
+          python3 run_benchmarks.py "${{ secrets.BENCHMARKS_WRITE_ADDRESS }}" "${{ secrets.BENCHMARKS_WRITE_PORT }}" "${{ secrets.BENCHMARKS_WRITE_USER }}" "${{ secrets.BENCHMARKS_WRITE_PASSWORD }}" "${{ github.sha }}"
+          rm run_benchmarks.py

.github/workflows/build-docfx.yml

@@ -0,0 +1,34 @@
+name: Build & Publish DocFX
+
+on:
+  schedule:
+    - cron: "0 0 * * 0"
+jobs:
+  docfx:
+   runs-on: ubuntu-latest
+   steps: 
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 6.0.x
+        
+    - name: Install dependencies
+      run: dotnet restore
+      
+    - name: Build Project
+      run: dotnet build --no-restore /p:WarningsAsErrors=nullable
+
+    - name: Build DocFX
+      uses: nikeee/docfx-action@v1.0.0      
+      with:
+        args: Robust.Docfx/docfx.json
+    
+    - name: Publish Docfx Documentation on GitHub Pages
+      uses: maxheld83/ghpages@master
+      env:
+        BUILD_DIR: Robust.Docfx/_robust-site 
+        GH_PAT: ${{ secrets.GH_PAT }} 

.github/workflows/build-test.yml

@@ -22,10 +22,12 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 6.0.100
+        dotnet-version: 6.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build
       run: dotnet build --no-restore /p:WarningsAsErrors=nullable
     - name: Test Engine
-      run: dotnet test --no-build Robust.UnitTesting/Robust.UnitTesting.csproj -v n
+      run: dotnet test --no-build Robust.UnitTesting/Robust.UnitTesting.csproj -- NUnit.ConsoleOut=0
+ 
+

.gitignore

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

.gitmodules

@@ -10,9 +10,6 @@
 [submodule "Robust.LoaderApi"]
 	path = Robust.LoaderApi
 	url = https://github.com/space-wizards/Robust.LoaderApi.git
-[submodule "ManagedHttpListener"]
-	path = ManagedHttpListener
-	url = https://github.com/space-wizards/ManagedHttpListener.git
 [submodule "cefglue"]
 	path = cefglue
 	url = https://github.com/space-wizards/cefglue.git

MSBuild/Robust.Engine.Version.props

@@ -1,4 +1,4 @@
 <Project>
     <!-- This file automatically reset by Tools/version.py -->
-    <PropertyGroup><Version>0.8.52</Version></PropertyGroup>
+    <PropertyGroup><Version>0.19.2.0</Version></PropertyGroup>
 </Project>

MSBuild/XamlIL.targets

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <!-- Avoid MSBuild adding a None entry for XAML files because they'd show up TWICE in the project view. -->
     <DefaultItemExcludes>**/*.xaml</DefaultItemExcludes>
-    <RobustUseExternalMSBuild>true</RobustUseExternalMSBuild>
+    <RobustUseExternalMSBuild>false</RobustUseExternalMSBuild>
     <_RobustUseExternalMSBuild>$(RobustUseExternalMSBuild)</_RobustUseExternalMSBuild>
     <_RobustUseExternalMSBuild Condition="'$(_RobustForceInternalMSBuild)' == 'true'">false</_RobustUseExternalMSBuild>
   </PropertyGroup>

Resources/Locale/en-US/commands.ftl

@@ -0,0 +1,89 @@
+### Localization for engine console commands
+
+## 'help' command
+cmd-help-desc = Display general help or help text for a specific command
+cmd-help-help = Usage: help [command name]
+    When no command name is provided, displays general-purpose help text. If a command name is provided, displays help text for that command.
+
+cmd-help-no-args = To display help for a specific command, write 'help <command>'. To list all available commands, write 'list'. To search for commands, use 'list <filter>'.
+cmd-help-unknown = Unknown command: { $command }
+cmd-help-top = { $command } - { $description }
+cmd-help-invalid-args = Invalid amount of arguments.
+cmd-help-arg-cmdname = [command name]
+
+## 'cvar' command
+cmd-cvar-desc = Gets or sets a CVar.
+cmd-cvar-help = Usage: cvar <name | ?> [value]
+    If a value is passed, the value is parsed and stored as the new value of the CVar.
+    If not, the current value of the CVar is displayed.
+    Use 'cvar ?' to get a list of all registered CVars.
+
+cmd-cvar-invalid-args = Must provide exactly one or two arguments.
+cmd-cvar-not-registered = CVar '{ $cvar }' is not registered. Use 'cvar ?' to get a list of all registered CVars.
+cmd-cvar-parse-error = Input value is in incorrect format for type { $type }
+cmd-cvar-compl-list = List available CVars
+cmd-cvar-arg-name = <name | ?>
+
+## 'list' command
+cmd-list-desc = Lists available commands, with optional search filter
+cmd-list-help = Usage: list [filter]
+    Lists all available commands. If an argument is provided, it will be used to filter commands by name.
+
+cmd-list-heading = SIDE NAME            DESC{"\u000A"}-------------------------{"\u000A"}
+
+cmd-list-arg-filter = [filter]
+
+## '>' command, aka remote exec
+cmd-remoteexec-desc = Executes server-side commands
+cmd-remoteexec-help = Usage: > <command> [arg] [arg] [arg...]
+    Executes a command on the server. This is necessary if a command with the same name exists on the client, as simply running the command would run the client command first.
+
+## 'gc' command
+cmd-gc-desc = Run the GC (Garbage Collector)
+cmd-gc-help = Usage: gc [generation]
+    Uses GC.Collect() to execute the Garbage Collector.
+    If an argument is provided, it is parsed as a GC generation number and GC.Collect(int) is used.
+    Use the 'gfc' command to do an LOH-compacting full GC.
+cmd-gc-failed-parse = Failed to parse argument.
+cmd-gc-arg-generation = [generation]
+
+## 'gcf' command
+cmd-gcf-desc = Run the GC, fully, compacting LOH and everything.
+cmd-gcf-help = Usage: gcf
+    Does a full GC.Collect(2, GCCollectionMode.Forced, true, true) while also compacting LOH.
+    This will probably lock up for hundreds of milliseconds, be warned.
+
+## 'gc_mode' command
+cmd-gc_mode-desc = Change/Read the GC Latency mode
+cmd-gc_mode-help = Usage: gc_mode [type]
+    If no argument is provided, returns the current GC latency mode.
+    If an argument is passed, it is parsed as GCLatencyMode and set as the GC latency mode.
+
+cmd-gc_mode-current = current gc latency mode: { $prevMode }
+cmd-gc_mode-possible = possible modes:
+cmd-gc_mode-option = - { $mode }
+cmd-gc_mode-unknown = unknown gc latency mode: { $arg }
+cmd-gc_mode-attempt = attempting gc latency mode change: { $prevMode } -> { $mode }
+cmd-gc_mode-result = resulting gc latency mode: { $mode }
+cmd-gc_mode-arg-type = [type]
+
+## 'mem' command
+cmd-mem-desc = Prints managed memory info
+cmd-mem-help = Usage: mem
+
+cmd-mem-report = Heap Size: { TOSTRING($heapSize, "N0") }
+    Total Allocated: { TOSTRING($totalAllocated, "N0") }
+
+## 'physics' command
+cmd-physics-overlay = {$overlay} is not a recognised overlay
+
+## 'lsasm' command
+cmd-lsasm-desc = Lists loaded assemblies by load context
+cmd-lsasm-help = Usage: lsasm
+
+## 'exec' command
+cmd-exec-desc = Executes a script file from the game's writeable user data
+cmd-exec-help = Usage: exec <fileName>
+    Each line in the file is executed as a single command, unless it starts with a #
+
+cmd-exec-arg-filename = <fileName>

Resources/Locale/en-US/controls.ftl

@@ -0,0 +1,10 @@
+color-selector-sliders-red = R
+color-selector-sliders-green = G
+color-selector-sliders-blue = B
+color-selector-sliders-hue = H
+color-selector-sliders-saturation = S
+color-selector-sliders-value = V
+color-selector-sliders-alpha = A
+
+color-selector-sliders-rgb = RGB
+color-selector-sliders-hsv = HSV

Resources/Locale/en-US/midi-commands.ftl

@@ -0,0 +1 @@
+midi-panic-command-description = Turns off every note for every active MIDI renderer.

Robust.Analyzers/Robust.Analyzers.csproj

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

Robust.Benchmarks/Configs/DefaultSQLConfig.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using System.Globalization;
+using BenchmarkDotNet.Analysers;
+using BenchmarkDotNet.Columns;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.Exporters;
+using BenchmarkDotNet.Filters;
+using BenchmarkDotNet.Jobs;
+using BenchmarkDotNet.Loggers;
+using BenchmarkDotNet.Order;
+using BenchmarkDotNet.Reports;
+using BenchmarkDotNet.Validators;
+using Robust.Benchmarks.Exporters;
+
+namespace Robust.Benchmarks.Configs;
+
+public sealed class DefaultSQLConfig : IConfig
+{
+    public static readonly IConfig Instance = new DefaultSQLConfig();
+
+    private DefaultSQLConfig(){}
+
+    public IEnumerable<IExporter> GetExporters()
+    {
+        yield return SQLExporter.Default;
+    }
+
+    public IEnumerable<IColumnProvider> GetColumnProviders() => DefaultConfig.Instance.GetColumnProviders();
+
+    public IEnumerable<ILogger> GetLoggers() => DefaultConfig.Instance.GetLoggers();
+
+    public IEnumerable<IDiagnoser> GetDiagnosers() => DefaultConfig.Instance.GetDiagnosers();
+
+    public IEnumerable<IAnalyser> GetAnalysers() => DefaultConfig.Instance.GetAnalysers();
+
+    public IEnumerable<Job> GetJobs() => DefaultConfig.Instance.GetJobs();
+
+    public IEnumerable<IValidator> GetValidators() => DefaultConfig.Instance.GetValidators();
+
+    public IEnumerable<HardwareCounter> GetHardwareCounters() => DefaultConfig.Instance.GetHardwareCounters();
+
+    public IEnumerable<IFilter> GetFilters() => DefaultConfig.Instance.GetFilters();
+
+    public IEnumerable<BenchmarkLogicalGroupRule> GetLogicalGroupRules() => DefaultConfig.Instance.GetLogicalGroupRules();
+
+    public IOrderer Orderer => DefaultConfig.Instance.Orderer!;
+    public SummaryStyle SummaryStyle => DefaultConfig.Instance.SummaryStyle;
+    public ConfigUnionRule UnionRule => DefaultConfig.Instance.UnionRule;
+    public string ArtifactsPath => DefaultConfig.Instance.ArtifactsPath;
+    public CultureInfo CultureInfo => DefaultConfig.Instance.CultureInfo!;
+    public ConfigOptions Options => DefaultConfig.Instance.Options;
+}

Robust.Benchmarks/EntityManager/AddRemoveComponentBenchmark.cs

@@ -0,0 +1,54 @@
+using BenchmarkDotNet.Attributes;
+using JetBrains.Annotations;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.UnitTesting.Server;
+
+namespace Robust.Benchmarks.EntityManager;
+
+[Virtual]
+public class AddRemoveComponentBenchmark
+{
+    private ISimulation _simulation = default!;
+    private IEntityManager _entityManager = default!;
+
+    [UsedImplicitly]
+    [Params(1, 10, 100, 1000)]
+    public int N;
+
+    [GlobalSetup]
+    public void GlobalSetup()
+    {
+        _simulation = RobustServerSimulation
+            .NewSimulation()
+            .RegisterComponents(f => f.RegisterClass<A>())
+            .InitializeInstance();
+
+        _entityManager = _simulation.Resolve<IEntityManager>();
+
+        var coords = new MapCoordinates(0, 0, new MapId(1));
+        _simulation.AddMap(coords.MapId);
+
+        for (var i = 0; i < N; i++)
+        {
+            _entityManager.SpawnEntity(null, coords);
+        }
+    }
+
+    [Benchmark]
+    public void AddRemoveComponent()
+    {
+        for (var i = 2; i <= N+1; i++)
+        {
+            var uid = new EntityUid(i);
+            _entityManager.AddComponent<A>(uid);
+            _entityManager.RemoveComponent<A>(uid);
+        }
+    }
+
+    [ComponentProtoName("A")]
+    public sealed class A : Component
+    {
+    }
+}

Robust.Benchmarks/EntityManager/ComponentIndexBenchmark.cs

@@ -0,0 +1,225 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading;
+using BenchmarkDotNet.Attributes;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Benchmarks.EntityManager;
+
+public class ComponentIndexBenchmark
+{
+    // Just a bunch of types to bloat the test lists.
+
+    private readonly CompIndexFetcher _compIndexFetcherDirect;
+    private readonly IFetcher _compIndexFetcher;
+    private readonly DictFetcher _dictFetcherDirect;
+    private readonly IFetcher _dictFetcher;
+
+
+    public ComponentIndexBenchmark()
+    {
+        _compIndexFetcherDirect = new CompIndexFetcher();
+        _compIndexFetcher = _compIndexFetcherDirect;
+        _dictFetcherDirect = new DictFetcher();
+        _dictFetcher = _dictFetcherDirect;
+    }
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        var types = typeof(ComponentIndexBenchmark)
+            .GetNestedTypes(BindingFlags.NonPublic)
+            .Where(t => t.Name.StartsWith("TestType"))
+            .ToArray();
+
+        _compIndexFetcher.Init(types);
+        _dictFetcher.Init(types);
+    }
+
+    [Benchmark]
+    public int BenchCompIndex() => _compIndexFetcher.Get<TestType50>();
+
+    [Benchmark]
+    public int BenchDict() => _dictFetcher.Get<TestType50>();
+
+    [Benchmark]
+    public int BenchCompIndexDirect() => _compIndexFetcherDirect.Get<TestType50>();
+
+    [Benchmark]
+    public int BenchDictDirect() => _dictFetcherDirect.Get<TestType50>();
+
+    private static CompIdx ArrayIndexFor<T>() => CompArrayIndex<T>.Idx;
+
+    private static int _compIndexMaster = -1;
+
+    private static class CompArrayIndex<T>
+    {
+        // ReSharper disable once StaticMemberInGenericType
+        public static readonly CompIdx Idx = new(Interlocked.Increment(ref _compIndexMaster));
+    }
+
+    private static CompIdx GetCompIdIndex(Type type)
+    {
+        return (CompIdx)typeof(CompArrayIndex<>)
+            .MakeGenericType(type)
+            .GetField(nameof(CompArrayIndex<int>.Idx), BindingFlags.Static | BindingFlags.Public)!
+            .GetValue(null)!;
+    }
+
+    private interface IFetcher
+    {
+        void Init(Type[] types);
+
+        int Get<T>();
+    }
+
+    private sealed class CompIndexFetcher : IFetcher
+    {
+        private int[] _values = Array.Empty<int>();
+
+        public void Init(Type[] types)
+        {
+            var max = types.Max(t => GetCompIdIndex(t).Value);
+
+            _values = new int[max + 1];
+
+            var i = 0;
+            foreach (var type in types)
+            {
+                _values[GetCompIdIndex(type).Value] = i++;
+            }
+        }
+
+        public int Get<T>()
+        {
+            return _values[CompArrayIndex<T>.Idx.Value];
+        }
+    }
+
+    private sealed class DictFetcher : IFetcher
+    {
+        private readonly Dictionary<Type, int> _values = new();
+
+        public void Init(Type[] types)
+        {
+            var i = 0;
+            foreach (var type in types)
+            {
+                _values[type] = i++;
+            }
+        }
+
+        public int Get<T>()
+        {
+            return _values[typeof(T)];
+        }
+    }
+
+    // Just a bunch of types to pad the size of the arrays and such.
+
+    // @formatter:off
+    // ReSharper disable UnusedType.Local
+    private sealed class TestType1{}
+    private sealed class TestType2{}
+    private sealed class TestType3{}
+    private sealed class TestType4{}
+    private sealed class TestType5{}
+    private sealed class TestType6{}
+    private sealed class TestType7{}
+    private sealed class TestType8{}
+    private sealed class TestType9{}
+    private sealed class TestType10{}
+    private sealed class TestType11{}
+    private sealed class TestType12{}
+    private sealed class TestType13{}
+    private sealed class TestType14{}
+    private sealed class TestType15{}
+    private sealed class TestType16{}
+    private sealed class TestType17{}
+    private sealed class TestType18{}
+    private sealed class TestType19{}
+    private sealed class TestType20{}
+    private sealed class TestType21{}
+    private sealed class TestType22{}
+    private sealed class TestType23{}
+    private sealed class TestType24{}
+    private sealed class TestType25{}
+    private sealed class TestType26{}
+    private sealed class TestType27{}
+    private sealed class TestType28{}
+    private sealed class TestType29{}
+    private sealed class TestType30{}
+    private sealed class TestType31{}
+    private sealed class TestType32{}
+    private sealed class TestType33{}
+    private sealed class TestType34{}
+    private sealed class TestType35{}
+    private sealed class TestType36{}
+    private sealed class TestType37{}
+    private sealed class TestType38{}
+    private sealed class TestType39{}
+    private sealed class TestType40{}
+    private sealed class TestType41{}
+    private sealed class TestType42{}
+    private sealed class TestType43{}
+    private sealed class TestType44{}
+    private sealed class TestType45{}
+    private sealed class TestType46{}
+    private sealed class TestType47{}
+    private sealed class TestType48{}
+    private sealed class TestType49{}
+    private sealed class TestType50{}
+    private sealed class TestType51{}
+    private sealed class TestType52{}
+    private sealed class TestType53{}
+    private sealed class TestType54{}
+    private sealed class TestType55{}
+    private sealed class TestType56{}
+    private sealed class TestType57{}
+    private sealed class TestType58{}
+    private sealed class TestType59{}
+    private sealed class TestType60{}
+    private sealed class TestType61{}
+    private sealed class TestType62{}
+    private sealed class TestType63{}
+    private sealed class TestType64{}
+    private sealed class TestType65{}
+    private sealed class TestType66{}
+    private sealed class TestType67{}
+    private sealed class TestType68{}
+    private sealed class TestType69{}
+    private sealed class TestType70{}
+    private sealed class TestType71{}
+    private sealed class TestType72{}
+    private sealed class TestType73{}
+    private sealed class TestType74{}
+    private sealed class TestType75{}
+    private sealed class TestType76{}
+    private sealed class TestType77{}
+    private sealed class TestType78{}
+    private sealed class TestType79{}
+    private sealed class TestType80{}
+    private sealed class TestType81{}
+    private sealed class TestType82{}
+    private sealed class TestType83{}
+    private sealed class TestType84{}
+    private sealed class TestType85{}
+    private sealed class TestType86{}
+    private sealed class TestType87{}
+    private sealed class TestType88{}
+    private sealed class TestType89{}
+    private sealed class TestType90{}
+    private sealed class TestType91{}
+    private sealed class TestType92{}
+    private sealed class TestType93{}
+    private sealed class TestType94{}
+    private sealed class TestType95{}
+    private sealed class TestType96{}
+    private sealed class TestType97{}
+    private sealed class TestType98{}
+    private sealed class TestType99{}
+    // ReSharper restore UnusedType.Local
+    // @formatter:on
+}

Robust.Benchmarks/EntityManager/GetComponentBenchmark.cs

@@ -0,0 +1,61 @@
+using System;
+using BenchmarkDotNet.Attributes;
+using JetBrains.Annotations;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.UnitTesting.Server;
+
+namespace Robust.Benchmarks.EntityManager;
+
+[Virtual]
+public class GetComponentBenchmark
+{
+    private ISimulation _simulation = default!;
+    private IEntityManager _entityManager = default!;
+
+    [UsedImplicitly]
+    [Params(1, 10, 100, 1000)]
+    public int N;
+
+    public A[] Comps = default!;
+
+    [GlobalSetup]
+    public void GlobalSetup()
+    {
+        _simulation = RobustServerSimulation
+            .NewSimulation()
+            .RegisterComponents(f => f.RegisterClass<A>())
+            .InitializeInstance();
+
+        _entityManager = _simulation.Resolve<IEntityManager>();
+
+        Comps = new A[N+2];
+
+        var coords = new MapCoordinates(0, 0, new MapId(1));
+        _simulation.AddMap(coords.MapId);
+
+        for (var i = 0; i < N; i++)
+        {
+            var uid = _entityManager.SpawnEntity(null, coords);
+            _entityManager.AddComponent<A>(uid);
+        }
+    }
+
+    [Benchmark]
+    public A[] GetComponent()
+    {
+        for (var i = 2; i <= N+1; i++)
+        {
+            Comps[i] = _entityManager.GetComponent<A>(new EntityUid(i));
+        }
+
+        // Return something so the JIT doesn't optimize out all the GetComponent calls.
+        return Comps;
+    }
+
+    [ComponentProtoName("A")]
+    public sealed class A : Component
+    {
+    }
+}

Robust.Benchmarks/EntityManager/SpawnDeleteEntityBenchmark.cs

@@ -0,0 +1,62 @@
+using BenchmarkDotNet.Attributes;
+using JetBrains.Annotations;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.UnitTesting.Server;
+
+namespace Robust.Benchmarks.EntityManager;
+
+[Virtual]
+public class SpawnDeleteEntityBenchmark
+{
+    private ISimulation _simulation = default!;
+    private IEntityManager _entityManager = default!;
+
+    private MapCoordinates _mapCoords = MapCoordinates.Nullspace;
+    private EntityCoordinates _entCoords = EntityCoordinates.Invalid;
+
+    [UsedImplicitly]
+    [Params(1, 10, 100, 1000)]
+    public int N;
+
+    [GlobalSetup]
+    public void GlobalSetup()
+    {
+        _simulation = RobustServerSimulation
+            .NewSimulation()
+            .RegisterComponents(f => f.RegisterClass<A>())
+            .InitializeInstance();
+
+        _entityManager = _simulation.Resolve<IEntityManager>();
+
+        _mapCoords = new MapCoordinates(0, 0, new MapId(1));
+        var uid = _simulation.AddMap(_mapCoords.MapId);
+        _entCoords = new EntityCoordinates(uid, 0, 0);
+    }
+
+    [Benchmark(Baseline = true)]
+    public void SpawnDeleteEntityMapCoords()
+    {
+        for (var i = 0; i < N; i++)
+        {
+            var uid = _entityManager.SpawnEntity(null, _mapCoords);
+            _entityManager.DeleteEntity(uid);
+        }
+    }
+
+    [Benchmark]
+    public void SpawnDeleteEntityEntCoords()
+    {
+        for (var i = 0; i < N; i++)
+        {
+            var uid = _entityManager.SpawnEntity(null, _entCoords);
+            _entityManager.DeleteEntity(uid);
+        }
+    }
+
+    [ComponentProtoName("A")]
+    public sealed class A : Component
+    {
+    }
+}

Robust.Benchmarks/Exporters/SQLExporter.cs

@@ -0,0 +1,195 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using BenchmarkDotNet.Exporters;
+using BenchmarkDotNet.Loggers;
+using BenchmarkDotNet.Mathematics;
+using BenchmarkDotNet.Reports;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using Npgsql;
+using Npgsql.Internal;
+using Npgsql.Internal.TypeHandlers;
+using Npgsql.Internal.TypeHandling;
+
+namespace Robust.Benchmarks.Exporters;
+
+public sealed class SQLExporter : IExporter
+{
+    public static readonly IExporter Default = new SQLExporter();
+
+    private SQLExporter(){}
+
+    public void ExportToLog(Summary summary, ILogger logger)
+    {
+        Export(summary, logger);
+    }
+
+    public IEnumerable<string> ExportToFiles(Summary summary, ILogger consoleLogger)
+    {
+        Export(summary, consoleLogger);
+        return Array.Empty<string>();
+    }
+
+    private bool TryGetEnvironmentVariable(string name, ILogger logger, [NotNullWhen(true)] out string? value)
+    {
+        value = Environment.GetEnvironmentVariable(name);
+        if (value == null)
+            logger.WriteError($"ROBUST_BENCHMARKS_ENABLE_SQL is set, but {name} is missing.");
+        return value != null;
+    }
+
+    private void Export(Summary summary, ILogger logger)
+    {
+        if (!TryGetEnvironmentVariable("ROBUST_BENCHMARKS_SQL_ADDRESS", logger, out var address) ||
+            !TryGetEnvironmentVariable("ROBUST_BENCHMARKS_SQL_PORT", logger, out var rawPort) ||
+            !TryGetEnvironmentVariable("ROBUST_BENCHMARKS_SQL_USER", logger, out var user) ||
+            !TryGetEnvironmentVariable("ROBUST_BENCHMARKS_SQL_PASSWORD", logger, out var password) ||
+            !TryGetEnvironmentVariable("ROBUST_BENCHMARKS_SQL_DATABASE", logger, out var db) ||
+            !TryGetEnvironmentVariable("GITHUB_SHA", logger, out var gitHash))
+            return;
+
+        if (!int.TryParse(rawPort, out var port))
+        {
+            logger.WriteError("Failed parsing ROBUST_BENCHMARKS_SQL_PORT to int.");
+            return;
+        }
+
+        var builder = new DbContextOptionsBuilder<BenchmarkContext>();
+        var connectionString = new NpgsqlConnectionStringBuilder
+        {
+            Host = address,
+            Port = port,
+            Database = db,
+            Username = user,
+            Password = password
+        }.ConnectionString;
+        builder.UseNpgsql(connectionString);
+        using var ctx = new BenchmarkContext(builder.Options);
+        try
+        {
+            ctx.Database.OpenConnection();
+            var con = (NpgsqlConnection) ctx.Database.GetDbConnection();
+            con.TypeMapper.AddTypeResolverFactory(new JsonOverrideTypeHandlerResolverFactory(new JsonSerializerOptions
+            {
+                NumberHandling = JsonNumberHandling.AllowNamedFloatingPointLiterals
+            }));
+
+            ctx.Database.Migrate();
+            ctx.BenchmarkRuns.Add(BenchmarkRun.FromSummary(summary, gitHash));
+            ctx.SaveChanges();
+        }
+        finally
+        {
+            ctx.Dispose();
+        }
+    }
+
+    public string Name => "sql";
+}
+
+// https://github.com/npgsql/efcore.pg/issues/1107#issuecomment-945126627
+class JsonOverrideTypeHandlerResolverFactory : TypeHandlerResolverFactory
+{
+    private readonly JsonSerializerOptions _options;
+
+    public JsonOverrideTypeHandlerResolverFactory(JsonSerializerOptions options)
+        => _options = options;
+
+    public override TypeHandlerResolver Create(NpgsqlConnector connector)
+        => new JsonOverrideTypeHandlerResolver(connector, _options);
+
+    public override string? GetDataTypeNameByClrType(Type clrType)
+        => null;
+
+    public override TypeMappingInfo? GetMappingByDataTypeName(string dataTypeName)
+        => null;
+
+    class JsonOverrideTypeHandlerResolver : TypeHandlerResolver
+    {
+        readonly JsonHandler _jsonbHandler;
+
+        internal JsonOverrideTypeHandlerResolver(NpgsqlConnector connector, JsonSerializerOptions options)
+            => _jsonbHandler ??= new JsonHandler(
+                connector.DatabaseInfo.GetPostgresTypeByName("jsonb"),
+                connector.TextEncoding,
+                isJsonb: true,
+                options);
+
+        public override NpgsqlTypeHandler? ResolveByDataTypeName(string typeName)
+            => typeName == "jsonb" ? _jsonbHandler : null;
+
+        public override NpgsqlTypeHandler? ResolveByClrType(Type type)
+            // You can add any user-defined CLR types which you want mapped to jsonb
+            => type == typeof(JsonDocument) ? _jsonbHandler : null;
+
+        public override TypeMappingInfo? GetMappingByDataTypeName(string dataTypeName)
+            => null; // Let the built-in resolver do this
+    }
+}
+public sealed class DesignTimeContextFactoryPostgres : IDesignTimeDbContextFactory<BenchmarkContext>
+{
+    public BenchmarkContext CreateDbContext(string[] args)
+    {
+        var optionsBuilder = new DbContextOptionsBuilder<BenchmarkContext>();
+        optionsBuilder.UseNpgsql("Server=localhost");
+        return new BenchmarkContext(optionsBuilder.Options);
+    }
+}
+
+public class BenchmarkContext : DbContext
+{
+    public DbSet<BenchmarkRun> BenchmarkRuns { get; set; } = default!;
+
+    public BenchmarkContext() { }
+    public BenchmarkContext(DbContextOptions<BenchmarkContext> options) : base(options) { }
+}
+
+public class BenchmarkRun
+{
+    public int Id { get; set; }
+    public string GitHash { get; set; } = string.Empty;
+
+    [Column(TypeName = "timestamptz")]
+    public DateTime RunDate { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    [Column(TypeName = "jsonb")]
+    public BenchmarkRunReport[] Reports { get; set; } = Array.Empty<BenchmarkRunReport>();
+
+    public static BenchmarkRun FromSummary(Summary summary, string gitHash)
+    {
+        return new BenchmarkRun
+        {
+            Reports = summary.Reports.Select(r => new BenchmarkRunReport
+            {
+                Parameters = r.BenchmarkCase.Parameters.Items.Select(p => new BenchmarkRunParameter
+                {
+                    Name = p.Name,
+                    Value = p.Value
+                }).ToArray(),
+                Statistics = r.ResultStatistics
+            }).ToArray(),
+            Name = summary.BenchmarksCases.First().FolderInfo,
+            RunDate = DateTime.UtcNow,
+            GitHash = gitHash
+        };
+    }
+}
+
+public class BenchmarkRunReport
+{
+    public BenchmarkRunParameter[] Parameters { get; set; } = Array.Empty<BenchmarkRunParameter>();
+    public Statistics Statistics { get; set; } = default!;
+}
+
+public class BenchmarkRunParameter
+{
+    public string Name { get; set; } = string.Empty;
+    public object Value { get; set; } = default!;
+}

Robust.Benchmarks/Migrations/20220328231938_InitialCreate.Designer.cs

@@ -0,0 +1,55 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using Robust.Benchmarks.Exporters;
+
+#nullable disable
+
+namespace Robust.Benchmarks.Migrations
+{
+    [DbContext(typeof(BenchmarkContext))]
+    [Migration("20220328231938_InitialCreate")]
+    partial class InitialCreate
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.0")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Robust.Benchmarks.Exporters.BenchmarkRun", b =>
+                {
+                    b.Property<decimal>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("numeric(20,0)");
+
+                    b.Property<string>("GitHash")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<BenchmarkRunReport[]>("Reports")
+                        .IsRequired()
+                        .HasColumnType("jsonb");
+
+                    b.Property<DateTime>("RunDate")
+                        .HasColumnType("Date");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("BenchmarkRuns");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Robust.Benchmarks/Migrations/20220328231938_InitialCreate.cs

@@ -0,0 +1,35 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Robust.Benchmarks.Exporters;
+
+#nullable disable
+
+namespace Robust.Benchmarks.Migrations
+{
+    public partial class InitialCreate : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "BenchmarkRuns",
+                columns: table => new
+                {
+                    Id = table.Column<decimal>(type: "numeric(20,0)", nullable: false),
+                    GitHash = table.Column<string>(type: "text", nullable: false),
+                    RunDate = table.Column<DateTime>(type: "Date", nullable: false),
+                    Name = table.Column<string>(type: "text", nullable: false),
+                    Reports = table.Column<BenchmarkRunReport[]>(type: "jsonb", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_BenchmarkRuns", x => x.Id);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "BenchmarkRuns");
+        }
+    }
+}

Robust.Benchmarks/Migrations/20220510131430_fix-pk.Designer.cs

@@ -0,0 +1,57 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using Robust.Benchmarks.Exporters;
+
+#nullable disable
+
+namespace Robust.Benchmarks.Migrations
+{
+    [DbContext(typeof(BenchmarkContext))]
+    [Migration("20220510131430_fix-pk")]
+    partial class fixpk
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.0")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Robust.Benchmarks.Exporters.BenchmarkRun", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("GitHash")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<BenchmarkRunReport[]>("Reports")
+                        .IsRequired()
+                        .HasColumnType("jsonb");
+
+                    b.Property<DateTime>("RunDate")
+                        .HasColumnType("timestamptz");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("BenchmarkRuns");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Robust.Benchmarks/Migrations/20220510131430_fix-pk.cs

@@ -0,0 +1,51 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace Robust.Benchmarks.Migrations
+{
+    public partial class fixpk : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<DateTime>(
+                name: "RunDate",
+                table: "BenchmarkRuns",
+                type: "timestamptz",
+                nullable: false,
+                oldClrType: typeof(DateTime),
+                oldType: "Date");
+
+            migrationBuilder.AlterColumn<int>(
+                name: "Id",
+                table: "BenchmarkRuns",
+                type: "integer",
+                nullable: false,
+                oldClrType: typeof(decimal),
+                oldType: "numeric(20,0)")
+                .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<DateTime>(
+                name: "RunDate",
+                table: "BenchmarkRuns",
+                type: "Date",
+                nullable: false,
+                oldClrType: typeof(DateTime),
+                oldType: "timestamptz");
+
+            migrationBuilder.AlterColumn<decimal>(
+                name: "Id",
+                table: "BenchmarkRuns",
+                type: "numeric(20,0)",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldType: "integer")
+                .OldAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+        }
+    }
+}

Robust.Benchmarks/Migrations/BenchmarkContextModelSnapshot.cs

@@ -0,0 +1,55 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using Robust.Benchmarks.Exporters;
+
+#nullable disable
+
+namespace Robust.Benchmarks.Migrations
+{
+    [DbContext(typeof(BenchmarkContext))]
+    partial class BenchmarkContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.0")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Robust.Benchmarks.Exporters.BenchmarkRun", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("GitHash")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<BenchmarkRunReport[]>("Reports")
+                        .IsRequired()
+                        .HasColumnType("jsonb");
+
+                    b.Property<DateTime>("RunDate")
+                        .HasColumnType("timestamptz");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("BenchmarkRuns");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Robust.Benchmarks/NumericsHelpers/AddBenchmark.cs

@@ -9,6 +9,9 @@ namespace Robust.Benchmarks.NumericsHelpers
         [Params(32, 128)]
         public int N { get; set; }
 
+        [Params(1,2)]
+        public int T { get; set; }
+
         private float[] _inputA = default!;
         private float[] _inputB = default!;
         private float[] _output = default!;

Robust.Benchmarks/Program.cs

@@ -1,6 +1,8 @@
 using BenchmarkDotNet.Configs;
 using BenchmarkDotNet.Running;
 using System;
+using Robust.Benchmarks.Configs;
+using Robust.Benchmarks.Exporters;
 
 namespace Robust.Benchmarks
 {
@@ -16,7 +18,8 @@ namespace Robust.Benchmarks
             Console.WriteLine("THE DEBUG BUILD IS ONLY GOOD FOR FIXING A CRASHING BENCHMARK\n");
             BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args, new DebugInProcessConfig());
 #else
-            BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);
+            var config = Environment.GetEnvironmentVariable("ROBUST_BENCHMARKS_ENABLE_SQL") != null ? DefaultSQLConfig.Instance : null;
+            BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args, config);
 #endif
         }
     }

Robust.Benchmarks/Robust.Benchmarks.csproj

@@ -6,13 +6,20 @@
         <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
         <OutputPath>../bin/Benchmarks</OutputPath>
         <OutputType>Exe</OutputType>
+        <NoWarn>RA0003</NoWarn>
     </PropertyGroup>
     <ItemGroup>
       <ProjectReference Include="..\Robust.Server\Robust.Server.csproj" />
       <ProjectReference Include="..\Robust.Shared\Robust.Shared.csproj" />
+      <ProjectReference Include="..\Robust.UnitTesting\Robust.UnitTesting.csproj" />
     </ItemGroup>
     <ItemGroup>
       <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.0">
+        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        <PrivateAssets>all</PrivateAssets>
+      </PackageReference>
+      <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.4" />
     </ItemGroup>
     <Import Project="..\MSBuild\Robust.Engine.targets" />
 </Project>

Robust.Benchmarks/Serialization/BenchmarkIntSerializer.cs

@@ -1,7 +1,6 @@
 using System.Globalization;
 using Robust.Shared.IoC;
 using Robust.Shared.Serialization.Manager;
-using Robust.Shared.Serialization.Manager.Result;
 using Robust.Shared.Serialization.Markdown;
 using Robust.Shared.Serialization.Markdown.Validation;
 using Robust.Shared.Serialization.Markdown.Value;
@@ -19,10 +18,10 @@ namespace Robust.Benchmarks.Serialization
                 : new ErrorNode(node, $"Failed parsing int value: {node.Value}");
         }
 
-        public DeserializationResult Read(ISerializationManager serializationManager, ValueDataNode node,
-            IDependencyCollection dependencies, bool skipHook, ISerializationContext? context = null)
+        public int Read(ISerializationManager serializationManager, ValueDataNode node,
+            IDependencyCollection dependencies, bool skipHook, ISerializationContext? context = null, int _ = default)
         {
-            return new DeserializedValue<int>(int.Parse(node.Value, CultureInfo.InvariantCulture));
+            return int.Parse(node.Value, CultureInfo.InvariantCulture);
         }
 
         public DataNode Write(ISerializationManager serializationManager, int value, bool alwaysWrite = false,

Robust.Benchmarks/Serialization/Copy/SerializationCopyBenchmark.cs

@@ -28,7 +28,7 @@ namespace Robust.Benchmarks.Serialization.Copy
 
             var seedMapping = yamlStream.Documents[0].RootNode.ToDataNodeCast<SequenceDataNode>().Cast<MappingDataNode>(0);
 
-            Seed = SerializationManager.ReadValueOrThrow<SeedDataDefinition>(seedMapping);
+            Seed = SerializationManager.Read<SeedDataDefinition>(seedMapping);
         }
 
         private const string String = "ABC";

Robust.Benchmarks/Serialization/Definitions/SeedDataDefinition.cs

@@ -19,6 +19,7 @@ namespace Robust.Benchmarks.Serialization.Definitions
   name: tobacco
   seedName: tobacco
   displayName: tobacco plant
+  plantRsi: Objects/Specific/Hydroponics/tobacco.rsi
   productPrototypes:
     - LeavesTobacco
   harvestRepeat: Repeat
@@ -36,7 +37,7 @@ namespace Robust.Benchmarks.Serialization.Definitions
       Max: 10
       PotencyDivisor: 10";
 
-        [DataField("id", required: true)] public string ID { get; set; } = default!;
+        [IdDataFieldAttribute] public string ID { get; set; } = default!;
 
         #region Tracking
         [DataField("name")] public string Name { get; set; } = string.Empty;

Robust.Benchmarks/Serialization/Read/SerializationReadBenchmark.cs

@@ -2,7 +2,6 @@
 using BenchmarkDotNet.Attributes;
 using Robust.Benchmarks.Serialization.Definitions;
 using Robust.Shared.Analyzers;
-using Robust.Shared.Serialization.Manager.Result;
 using Robust.Shared.Serialization.Markdown;
 using Robust.Shared.Serialization.Markdown.Mapping;
 using Robust.Shared.Serialization.Markdown.Sequence;
@@ -42,32 +41,32 @@ namespace Robust.Benchmarks.Serialization.Read
         private ValueDataNode FlagThirtyOne { get; } = new("ThirtyOne");
 
         [Benchmark]
-        public string? ReadString()
+        public string ReadString()
         {
-            return SerializationManager.ReadValue<string>(StringNode);
+            return SerializationManager.Read<string>(StringNode);
         }
 
         [Benchmark]
-        public int? ReadInteger()
+        public int ReadInteger()
         {
-            return SerializationManager.ReadValue<int>(IntNode);
+            return SerializationManager.Read<int>(IntNode);
         }
 
         [Benchmark]
-        public DataDefinitionWithString? ReadDataDefinitionWithString()
+        public DataDefinitionWithString ReadDataDefinitionWithString()
         {
-            return SerializationManager.ReadValue<DataDefinitionWithString>(StringDataDefNode);
+            return SerializationManager.Read<DataDefinitionWithString>(StringDataDefNode);
         }
 
         [Benchmark]
-        public SeedDataDefinition? ReadSeedDataDefinition()
+        public SeedDataDefinition ReadSeedDataDefinition()
         {
-            return SerializationManager.ReadValue<SeedDataDefinition>(SeedNode);
+            return SerializationManager.Read<SeedDataDefinition>(SeedNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("flag")]
-        public DeserializationResult ReadFlagZero()
+        public object? ReadFlagZero()
         {
             return SerializationManager.ReadWithTypeSerializer(
                 typeof(int),
@@ -77,7 +76,7 @@ namespace Robust.Benchmarks.Serialization.Read
 
         [Benchmark]
         [BenchmarkCategory("flag")]
-        public DeserializationResult ReadThirtyOne()
+        public object? ReadThirtyOne()
         {
             return SerializationManager.ReadWithTypeSerializer(
                 typeof(int),
@@ -87,7 +86,7 @@ namespace Robust.Benchmarks.Serialization.Read
 
         [Benchmark]
         [BenchmarkCategory("customTypeSerializer")]
-        public DeserializationResult ReadIntegerCustomSerializer()
+        public object? ReadIntegerCustomSerializer()
         {
             return SerializationManager.ReadWithTypeSerializer(
                 typeof(int),

Robust.Benchmarks/Serialization/SerializationArrayBenchmark.cs

@@ -46,84 +46,84 @@ namespace Robust.Benchmarks.Serialization
         [BenchmarkCategory("read")]
         public string[]? ReadEmptyString()
         {
-            return SerializationManager.ReadValue<string[]>(EmptyNode);
+            return SerializationManager.Read<string[]>(EmptyNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public string[]? ReadOneString()
         {
-            return SerializationManager.ReadValue<string[]>(OneIntNode);
+            return SerializationManager.Read<string[]>(OneIntNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public string[]? ReadTenStrings()
         {
-            return SerializationManager.ReadValue<string[]>(TenIntsNode);
+            return SerializationManager.Read<string[]>(TenIntsNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public int[]? ReadEmptyInt()
         {
-            return SerializationManager.ReadValue<int[]>(EmptyNode);
+            return SerializationManager.Read<int[]>(EmptyNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public int[]? ReadOneInt()
         {
-            return SerializationManager.ReadValue<int[]>(OneIntNode);
+            return SerializationManager.Read<int[]>(OneIntNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public int[]? ReadTenInts()
         {
-            return SerializationManager.ReadValue<int[]>(TenIntsNode);
+            return SerializationManager.Read<int[]>(TenIntsNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public DataDefinitionWithString[]? ReadEmptyStringDataDef()
         {
-            return SerializationManager.ReadValue<DataDefinitionWithString[]>(EmptyNode);
+            return SerializationManager.Read<DataDefinitionWithString[]>(EmptyNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public DataDefinitionWithString[]? ReadOneStringDataDef()
         {
-            return SerializationManager.ReadValue<DataDefinitionWithString[]>(OneStringDefNode);
+            return SerializationManager.Read<DataDefinitionWithString[]>(OneStringDefNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public DataDefinitionWithString[]? ReadTenStringDataDefs()
         {
-            return SerializationManager.ReadValue<DataDefinitionWithString[]>(TenStringDefsNode);
+            return SerializationManager.Read<DataDefinitionWithString[]>(TenStringDefsNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public SealedDataDefinitionWithString[]? ReadEmptySealedStringDataDef()
         {
-            return SerializationManager.ReadValue<SealedDataDefinitionWithString[]>(EmptyNode);
+            return SerializationManager.Read<SealedDataDefinitionWithString[]>(EmptyNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public SealedDataDefinitionWithString[]? ReadOneSealedStringDataDef()
         {
-            return SerializationManager.ReadValue<SealedDataDefinitionWithString[]>(OneStringDefNode);
+            return SerializationManager.Read<SealedDataDefinitionWithString[]>(OneStringDefNode);
         }
 
         [Benchmark]
         [BenchmarkCategory("read")]
         public SealedDataDefinitionWithString[]? ReadTenSealedStringDataDefs()
         {
-            return SerializationManager.ReadValue<SealedDataDefinitionWithString[]>(TenStringDefsNode);
+            return SerializationManager.Read<SealedDataDefinitionWithString[]>(TenStringDefsNode);
         }
     }
 }

Robust.Benchmarks/Serialization/Write/SerializationWriteBenchmark.cs

@@ -28,7 +28,7 @@ namespace Robust.Benchmarks.Serialization.Write
 
             var seedMapping = yamlStream.Documents[0].RootNode.ToDataNodeCast<SequenceDataNode>().Cast<MappingDataNode>(0);
 
-            Seed = SerializationManager.ReadValueOrThrow<SeedDataDefinition>(seedMapping);
+            Seed = SerializationManager.Read<SeedDataDefinition>(seedMapping);
         }
 
         private const string String = "ABC";

Robust.Benchmarks/add-migration.ps1

@@ -0,0 +1,11 @@
+#!/usr/bin/env pwsh
+
+param([String]$name)
+
+if ($name -eq "")
+{
+    Write-Error "must specify migration name"
+    exit
+}
+
+dotnet ef migrations add --context BenchmarkContext -o Migrations $name

Robust.Benchmarks/add-migration.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+if [ -z "$1" ] ; then
+    echo "Must specify migration name"
+    exit 1
+fi
+
+dotnet ef migrations add --context BenchmarkContext -o Migrations "$1"

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

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

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

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

Robust.Client/Animations/AnimationTrackProperty.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Robust.Shared.Animations;
 using Robust.Shared.Maths;
@@ -101,7 +101,7 @@ namespace Robust.Client.Animations
                 case double d:
                     return MathHelper.Lerp(d, (double) b, t);
                 case Angle angle:
-                    return (Angle) MathHelper.Lerp(angle, (Angle) b, t);
+                    return Angle.Lerp(angle, (Angle) b, t);
                 case Color color:
                     return Color.InterpolateBetween(color, (Color) b, t);
                 case int i:

Robust.Client/Audio/Midi/Commands/MidiPanicCommand.cs

@@ -0,0 +1,22 @@
+using Robust.Shared.Console;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Robust.Client.Audio.Midi.Commands;
+
+public sealed class MidiPanicCommand : IConsoleCommand
+{
+    [Dependency] private readonly IMidiManager _midiManager = default!;
+
+    public string Command => "midipanic";
+    public string Description => Loc.GetString("midi-panic-command-description");
+    public string Help => $"{Command}";
+
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        foreach (var renderer in _midiManager.Renderers)
+        {
+            renderer.StopAllNotes();
+        }
+    }
+}

Robust.Client/Audio/Midi/IMidiManager.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using NFluidsynth;
+using Robust.Shared.Audio.Midi;
+
+namespace Robust.Client.Audio.Midi;
+
+public interface IMidiManager
+{
+    /// <summary>
+    ///     A read-only list of all existing MIDI Renderers.
+    /// </summary>
+    IReadOnlyList<IMidiRenderer> Renderers { get; }
+
+    /// <summary>
+    ///     If true, MIDI support is available.
+    /// </summary>
+    bool IsAvailable { get; }
+
+    /// <summary>
+    ///     Volume, in db.
+    /// </summary>
+    float Volume { get; set; }
+
+    public int OcclusionCollisionMask { get; set; }
+
+    /// <summary>
+    ///     This method tries to return a midi renderer ready to be used.
+    ///     You only need to set the <see cref="IMidiRenderer.MidiProgram"/> afterwards.
+    /// </summary>
+    /// <remarks>
+    ///     This method can fail if MIDI support is not available.
+    /// </remarks>
+    /// <returns>
+    ///     <c>null</c> if MIDI support is not available.
+    /// </returns>
+    IMidiRenderer? GetNewRenderer(bool mono = true);
+
+    /// <summary>
+    ///     Creates a <see cref="RobustMidiEvent"/> given a <see cref="MidiEvent"/> and a sequencer tick.
+    /// </summary>
+    RobustMidiEvent FromFluidEvent(MidiEvent midiEvent, uint tick);
+
+    /// <summary>
+    ///     Creates a <see cref="SequencerEvent"/> given a <see cref="RobustMidiEvent"/>.
+    ///     Be sure to dispose of the result after you've used it.
+    /// </summary>
+    SequencerEvent ToSequencerEvent(RobustMidiEvent midiEvent);
+
+    /// <summary>
+    ///     Creates a <see cref="RobustMidiEvent"/> given a <see cref="SequencerEvent"/> and a sequencer tick.
+    /// </summary>
+    RobustMidiEvent FromSequencerEvent(SequencerEvent midiEvent, uint tick);
+
+    /// <summary>
+    ///     Method called every frame.
+    ///     Should be used to update positional audio.
+    /// </summary>
+    /// <param name="frameTime"></param>
+    void FrameUpdate(float frameTime);
+
+    void Shutdown();
+}

Robust.Client/Audio/Midi/IMidiRenderer.cs

@@ -0,0 +1,174 @@
+using System;
+using Robust.Client.Graphics;
+using Robust.Shared.Audio.Midi;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+
+namespace Robust.Client.Audio.Midi;
+
+public enum MidiRendererStatus : byte
+{
+    None,
+    Input,
+    File,
+}
+
+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>
+    bool LoopMidi { get; set; }
+
+    /// <summary>
+    ///     This increases all note on velocities to 127.
+    /// </summary>
+    bool VolumeBoost { get; set; }
+
+    /// <summary>
+    ///     The midi program (instrument) the renderer is using.
+    /// </summary>
+    byte MidiProgram { get; set; }
+
+    /// <summary>
+    ///     The instrument bank the renderer is using.
+    /// </summary>
+    byte MidiBank { get; set; }
+
+    /// <summary>
+    ///     The soundfont currently selected by the renderer.
+    /// </summary>
+    uint MidiSoundfont { get; set; }
+
+    /// <summary>
+    ///     The current status of the renderer.
+    ///     "None" if the renderer isn't playing from input or a midi file.
+    ///     "Input" if the renderer is playing from midi input.
+    ///     "File" if the renderer is playing from a midi file.
+    /// </summary>
+    MidiRendererStatus Status { get; }
+
+    /// <summary>
+    ///     Whether the sound will play in stereo or mono.
+    /// </summary>
+    bool Mono { get; set; }
+
+    /// <summary>
+    ///     Whether to drop messages on the percussion channel.
+    /// </summary>
+    bool DisablePercussionChannel { get; set; }
+
+    /// <summary>
+    /// Whether to drop messages for program change events.
+    /// </summary>
+    bool DisableProgramChangeEvent { get; set; }
+
+    /// <summary>
+    ///     Gets the total number of ticks possible for the MIDI player.
+    /// </summary>
+    int PlayerTotalTick { get; }
+
+    /// <summary>
+    ///     Gets or sets (seeks) the current tick of the MIDI player.
+    /// </summary>
+    int PlayerTick { get; set; }
+
+    /// <summary>
+    ///     Gets the current tick of the sequencer.
+    /// </summary>
+    uint SequencerTick { get; }
+
+    /// <summary>
+    ///     Gets the Time Scale of the sequencer in ticks per second. Default is 1000 for 1 tick per millisecond.
+    /// </summary>
+    double SequencerTimeScale { get; }
+
+    /// <summary>
+    ///     Start listening for midi input.
+    /// </summary>
+    bool OpenInput();
+
+    /// <summary>
+    ///     Start playing a midi file.
+    /// </summary>
+    /// <param name="buffer">Bytes of the midi file</param>
+    bool OpenMidi(ReadOnlySpan<byte> buffer);
+
+    /// <summary>
+    ///     Stops listening for midi input.
+    /// </summary>
+    bool CloseInput();
+
+    /// <summary>
+    ///     Stops playing midi files.
+    /// </summary>
+    bool CloseMidi();
+
+    /// <summary>
+    ///     Stops all notes being played currently.
+    /// </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>
+    void LoadSoundfont(string filename, bool resetPresets = false);
+
+    /// <summary>
+    ///     Invoked whenever a new midi event is registered.
+    /// </summary>
+    event Action<RobustMidiEvent> OnMidiEvent;
+
+    /// <summary>
+    ///     Invoked when the midi player finishes playing a song.
+    /// </summary>
+    event Action OnMidiPlayerFinished;
+
+    /// <summary>
+    ///     The entity whose position will be used for positional audio.
+    ///     This is only used if <see cref="Mono"/> is set to True.
+    /// </summary>
+    EntityUid? TrackingEntity { get; set; }
+
+    /// <summary>
+    ///     The position that will be used for positional audio.
+    ///     This is only used if <see cref="Mono"/> is set to True
+    ///     and <see cref="TrackingEntity"/> is null.
+    /// </summary>
+    EntityCoordinates? TrackingCoordinates { get; set; }
+
+    /// <summary>
+    ///     Send a midi event for the renderer to play.
+    /// </summary>
+    /// <param name="midiEvent">The midi event to be played</param>
+    void SendMidiEvent(RobustMidiEvent midiEvent);
+
+    /// <summary>
+    ///     Schedule a MIDI event to be played at a later time.
+    /// </summary>
+    /// <param name="midiEvent">the midi event in question</param>
+    /// <param name="time"></param>
+    /// <param name="absolute"></param>
+    void ScheduleMidiEvent(RobustMidiEvent midiEvent, uint time, bool absolute);
+
+    /// <summary>
+    ///     Actually disposes of this renderer. Do NOT use outside the MIDI thread.
+    /// </summary>
+    internal void InternalDispose();
+}

Robust.Client/Audio/Midi/MidiManager.Conversion.cs

@@ -0,0 +1,155 @@
+using NFluidsynth;
+using Robust.Shared.Audio.Midi;
+
+namespace Robust.Client.Audio.Midi;
+
+internal sealed partial class MidiManager
+{
+    public RobustMidiEvent FromFluidEvent(MidiEvent midiEvent, uint tick)
+    {
+        var status = RobustMidiEvent.MakeStatus((byte) midiEvent.Channel, (byte) midiEvent.Type);
+
+        // Control is always the first data byte. Value is always the second data byte. Fluidsynth's API ain't great.
+        var data1 = (byte) midiEvent.Control;
+        var data2 = (byte) midiEvent.Value;
+
+        // PitchBend is handled specially.
+        if (midiEvent.Type == (int) RobustMidiCommand.PitchBend)
+        {
+            // We pack pitch into both data values.
+            var pitch = (ushort) midiEvent.Pitch;
+            data1 = (byte) pitch;
+            data2 = (byte) (pitch >> 8);
+        }
+
+        return new RobustMidiEvent(status, data1, data2, tick);
+    }
+
+    public SequencerEvent ToSequencerEvent(RobustMidiEvent midiEvent)
+    {
+        var sequencerEvent = new SequencerEvent();
+
+        switch (midiEvent.MidiCommand)
+        {
+            case RobustMidiCommand.NoteOff:
+                sequencerEvent.NoteOff(midiEvent.Channel, midiEvent.Key);
+                break;
+
+            case RobustMidiCommand.NoteOn:
+                sequencerEvent.NoteOn(midiEvent.Channel, midiEvent.Key, midiEvent.Velocity);
+                break;
+
+            case RobustMidiCommand.AfterTouch:
+                sequencerEvent.KeyPressure(midiEvent.Channel, midiEvent.Key, midiEvent.Value);
+                break;
+
+            case RobustMidiCommand.ControlChange:
+                sequencerEvent.ControlChange(midiEvent.Channel, midiEvent.Control, midiEvent.Value);
+                break;
+
+            case RobustMidiCommand.ProgramChange:
+                sequencerEvent.ProgramChange(midiEvent.Channel, midiEvent.Program);
+                break;
+
+            case RobustMidiCommand.ChannelPressure:
+                sequencerEvent.ChannelPressure(midiEvent.Channel, midiEvent.Value);
+                break;
+
+            case RobustMidiCommand.PitchBend:
+                sequencerEvent.PitchBend(midiEvent.Channel, midiEvent.Pitch);
+                break;
+
+            case RobustMidiCommand.SystemMessage:
+                switch (midiEvent.Control)
+                {
+                    case 0x0 when midiEvent.Status == 0xFF:
+                        sequencerEvent.SystemReset();
+                        break;
+
+                    case 0x0B:
+                        sequencerEvent.AllNotesOff(midiEvent.Channel);
+                        break;
+
+                    default:
+                        _midiSawmill.Warning($"Tried to convert unsupported event to sequencer event:\n{midiEvent}");
+                        break;
+                }
+
+                break;
+
+            default:
+                _midiSawmill.Warning($"Tried to convert unsupported event to sequencer event:\n{midiEvent}");
+                break;
+        }
+
+        return sequencerEvent;
+    }
+
+    public RobustMidiEvent FromSequencerEvent(SequencerEvent midiEvent, uint tick)
+    {
+        byte channel = (byte) midiEvent.Channel;
+        RobustMidiCommand command = 0x0;
+        byte data1 = 0;
+        byte data2 = 0;
+
+        switch (midiEvent.Type)
+        {
+            case FluidSequencerEventType.NoteOn:
+                command = RobustMidiCommand.NoteOn;
+                data1 = (byte) midiEvent.Key;
+                data2 = (byte) midiEvent.Velocity;
+                break;
+
+            case FluidSequencerEventType.NoteOff:
+                command = RobustMidiCommand.NoteOff;
+                data1 = (byte) midiEvent.Key;
+                break;
+
+            case FluidSequencerEventType.PitchBend:
+                command = RobustMidiCommand.PitchBend;
+                // We pack pitch into both data values
+                var pitch = (ushort) midiEvent.Pitch;
+                data1 = (byte) pitch;
+                data2 = (byte) (pitch >> 8);
+                break;
+
+            case FluidSequencerEventType.ProgramChange:
+                command = RobustMidiCommand.ProgramChange;
+                data1 = (byte) midiEvent.Program;
+                break;
+
+            case FluidSequencerEventType.KeyPressure:
+                command = RobustMidiCommand.AfterTouch;
+                data1 = (byte) midiEvent.Key;
+                data2 = (byte) midiEvent.Value;
+                break;
+
+            case FluidSequencerEventType.ControlChange:
+                command = RobustMidiCommand.ControlChange;
+                data1 = (byte) midiEvent.Control;
+                data2 = (byte) midiEvent.Value;
+                break;
+
+            case FluidSequencerEventType.ChannelPressure:
+                command = RobustMidiCommand.ChannelPressure;
+                data1 = (byte) midiEvent.Value;
+                break;
+
+            case FluidSequencerEventType.AllNotesOff:
+                command = RobustMidiCommand.SystemMessage;
+                data1 = 0x0B;
+                break;
+
+            case FluidSequencerEventType.SystemReset:
+                command = RobustMidiCommand.SystemMessage;
+                channel = 0x0F;
+                break;
+
+            default:
+                _midiSawmill.Error($"Unsupported Sequencer Event: {tick:D8}: {SequencerEventToString(midiEvent)}");
+                break;
+        }
+
+        return new RobustMidiEvent(RobustMidiEvent.MakeStatus(channel, (byte)command), data1, data2, tick);
+    }
+}

Robust.Client/Audio/Midi/MidiManager.cs

@@ -7,6 +7,7 @@ using NFluidsynth;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Shared;
+using Robust.Shared.Asynchronous;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
 using Robust.Shared.GameObjects;
@@ -15,404 +16,440 @@ 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
+namespace Robust.Client.Audio.Midi;
+
+internal sealed partial class MidiManager : IMidiManager
 {
-    public interface IMidiManager
+    [Dependency] private readonly IEyeManager _eyeManager = default!;
+    [Dependency] private readonly IResourceManagerInternal _resourceManager = default!;
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+    [Dependency] private readonly IConfigurationManager _cfgMan = default!;
+    [Dependency] private readonly IClydeAudio _clydeAudio = default!;
+    [Dependency] private readonly ITaskManager _taskManager = default!;
+    [Dependency] private readonly ILogManager _logger = default!;
+
+    private SharedPhysicsSystem _broadPhaseSystem = default!;
+
+    public IReadOnlyList<IMidiRenderer> Renderers
     {
-        /// <summary>
-        ///     This method tries to return a midi renderer ready to be used.
-        ///     You only need to set the <see cref="IMidiRenderer.MidiProgram"/> afterwards.
-        /// </summary>
-        /// <remarks>
-        ///     This method can fail if MIDI support is not available.
-        /// </remarks>
-        /// <returns>
-        ///     <c>null</c> if MIDI support is not available.
-        /// </returns>
-        IMidiRenderer? GetNewRenderer();
-
-        /// <summary>
-        ///     Method called every frame.
-        ///     Should be used to update positional audio.
-        /// </summary>
-        /// <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>
-        bool IsAvailable { get; }
-
-        public int OcclusionCollisionMask { get; set; }
-
-        void Shutdown();
+        get
+        {
+            lock (_renderers)
+            {
+                // Perform a copy. Sadly, we can't return a reference to the original list due to threading concerns.
+                return _renderers.ToArray();
+            }
+        }
     }
 
-    internal sealed class MidiManager : IMidiManager
+    [ViewVariables]
+    public bool IsAvailable
     {
-        [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 SharedPhysicsSystem _broadPhaseSystem = default!;
-
-        [ViewVariables]
-        public bool IsAvailable
+        get
         {
-            get
-            {
-                InitializeFluidsynth();
+            InitializeFluidsynth();
 
-                return FluidsynthInitialized;
-            }
+            return FluidsynthInitialized;
+        }
+    }
+
+    [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;
+
+    // Not reliable until Fluidsynth is initialized!
+    [ViewVariables(VVAccess.ReadWrite)]
+    public float Volume
+    {
+        get => _volume;
+        set
+        {
+            if (MathHelper.CloseToPercent(_volume, value))
+                return;
+
+            _cfgMan.SetCVar(CVars.MidiVolume, value);
+            _volumeDirty = true;
+        }
+    }
+
+    private static readonly string[] LinuxSoundfonts =
+    {
+        "/usr/share/soundfonts/default.sf2",
+        "/usr/share/soundfonts/default.dls",
+        "/usr/share/soundfonts/FluidR3_GM.sf2",
+        "/usr/share/soundfonts/freepats-general-midi.sf2",
+        "/usr/share/sounds/sf2/default.sf2",
+        "/usr/share/sounds/sf2/default.dls",
+        "/usr/share/sounds/sf2/FluidR3_GM.sf2",
+        "/usr/share/sounds/sf2/TimGM6mb.sf2",
+    };
+
+    private const string WindowsSoundfont = @"C:\WINDOWS\system32\drivers\gm.dls";
+
+    private const string OsxSoundfont =
+        "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
+
+    private const string FallbackSoundfont = "/Midi/fallback.sf2";
+
+    private const float MaxDistanceForOcclusion = 1000;
+
+    private static ResourcePath CustomSoundfontDirectory = new ResourcePath("/soundfonts/");
+
+    private readonly ResourceLoaderCallbacks _soundfontLoaderCallbacks = new();
+
+    private bool FluidsynthInitialized;
+    private bool _failedInitialize;
+
+    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;
+
+        _volume = _cfgMan.GetCVar(CVars.MidiVolume);
+        _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
+        {
+            _volume = value;
+            _volumeDirty = true;
+        }, true);
+
+        _midiSawmill = _logger.GetSawmill("midi");
+        _midiSawmill.Level = LogLevel.Info;
+        _sawmill = _logger.GetSawmill("midi.fluidsynth");
+        _loggerDelegate = LoggerDelegate;
+
+        if (!_resourceManager.UserData.Exists(CustomSoundfontDirectory))
+        {
+            _resourceManager.UserData.CreateDir(CustomSoundfontDirectory);
+        }
+        // not a directory, preserve the old file and create an actual directory
+        else if (!_resourceManager.UserData.IsDir(CustomSoundfontDirectory))
+        {
+            _resourceManager.UserData.Rename(CustomSoundfontDirectory, CustomSoundfontDirectory.WithName(CustomSoundfontDirectory.Filename + ".old"));
+            _resourceManager.UserData.CreateDir(CustomSoundfontDirectory);
         }
 
-        [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;
-
-        // Not reliable until Fluidsynth is initialized!
-        [ViewVariables(VVAccess.ReadWrite)]
-        public float Volume
+        try
         {
-            get => _volume;
-            set
-            {
-                if (MathHelper.CloseToPercent(_volume, value))
-                    return;
+            NFluidsynth.Logger.SetLoggerMethod(_loggerDelegate); // Will cause a safe DllNotFoundException if not available.
 
-                _cfgMan.SetCVar(CVars.MidiVolume, value);
-                _volumeDirty = true;
-            }
+            _settings = new Settings();
+            _settings["synth.sample-rate"].DoubleValue = 44100;
+            _settings["player.timing-source"].StringValue = "sample";
+            _settings["synth.lock-memory"].IntValue = 0;
+            _settings["synth.threadsafe-api"].IntValue = 1;
+            _settings["synth.gain"].DoubleValue = 1.0d;
+            _settings["synth.polyphony"].IntValue = 1024;
+            _settings["synth.cpu-cores"].IntValue = 2;
+            _settings["synth.midi-channels"].IntValue = 16;
+            _settings["synth.overflow.age"].DoubleValue = 3000;
+            _settings["audio.driver"].StringValue = "file";
+            _settings["audio.periods"].IntValue = 8;
+            _settings["audio.period-size"].IntValue = 4096;
+            _settings["midi.autoconnect"].IntValue = 1;
+            _settings["player.reset-synth"].IntValue = 0;
+            _settings["synth.midi-bank-select"].StringValue = "gm";
+            //_settings["synth.verbose"].IntValue = 1; // Useful for debugging.
+        }
+        catch (Exception e)
+        {
+            _midiSawmill.Warning(
+                "Failed to initialize fluidsynth due to exception, disabling MIDI support:\n{0}", e);
+            _failedInitialize = true;
+            return;
         }
 
-        private static readonly string[] LinuxSoundfonts =
-        {
-            "/usr/share/soundfonts/default.sf2",
-            "/usr/share/soundfonts/FluidR3_GM.sf2",
-            "/usr/share/soundfonts/freepats-general-midi.sf2",
-            "/usr/share/sounds/sf2/default.sf2",
-            "/usr/share/sounds/sf2/FluidR3_GM.sf2",
-            "/usr/share/sounds/sf2/TimGM6mb.sf2",
+        _midiThread = new Thread(ThreadUpdate);
+        _midiThread.Start();
+
+        _broadPhaseSystem = EntitySystem.Get<SharedPhysicsSystem>();
+        FluidsynthInitialized = true;
+    }
+
+    private void LoggerDelegate(NFluidsynth.Logger.LogLevel level, string message, IntPtr data)
+    {
+        var rLevel = level switch {
+            NFluidsynth.Logger.LogLevel.Panic => LogLevel.Error,
+            NFluidsynth.Logger.LogLevel.Error => LogLevel.Error,
+            NFluidsynth.Logger.LogLevel.Warning => LogLevel.Warning,
+            NFluidsynth.Logger.LogLevel.Information => LogLevel.Info,
+            NFluidsynth.Logger.LogLevel.Debug => LogLevel.Debug,
+            _ => LogLevel.Debug
         };
+        _sawmill.Log(rLevel, message);
+    }
 
-        private const string WindowsSoundfont = @"C:\WINDOWS\system32\drivers\gm.dls";
-
-        private const string OsxSoundfont =
-            "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
-
-        private const string FallbackSoundfont = "/Midi/fallback.sf2";
-
-        private readonly ResourceLoaderCallbacks _soundfontLoaderCallbacks = new();
-
-        private bool FluidsynthInitialized;
-        private bool _failedInitialize;
-
-        private NFluidsynth.Logger.LoggerDelegate _loggerDelegate = default!;
-        private ISawmill _sawmill = default!;
-
-        [ViewVariables(VVAccess.ReadWrite)]
-        public int OcclusionCollisionMask { get; set; }
-
-        private void InitializeFluidsynth()
+    public IMidiRenderer? GetNewRenderer(bool mono = true)
+    {
+        if (!FluidsynthInitialized)
         {
-            if (FluidsynthInitialized || _failedInitialize) return;
+            InitializeFluidsynth();
 
-            _volume = _cfgMan.GetCVar(CVars.MidiVolume);
-            _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
+            if (!FluidsynthInitialized) // init failed
             {
-                _volume = value;
-                _volumeDirty = true;
-            }, true);
-
-            _midiSawmill = Logger.GetSawmill("midi");
-            _sawmill = Logger.GetSawmill("midi.fluidsynth");
-            _loggerDelegate = LoggerDelegate;
-
-            try
-            {
-                NFluidsynth.Logger.SetLoggerMethod(_loggerDelegate); // Will cause a safe DllNotFoundException if not available.
-
-                _settings = new Settings();
-                _settings["synth.sample-rate"].DoubleValue = 44100;
-                _settings["player.timing-source"].StringValue = "sample";
-                _settings["synth.lock-memory"].IntValue = 0;
-                _settings["synth.threadsafe-api"].IntValue = 1;
-                _settings["synth.gain"].DoubleValue = 1.0d;
-                _settings["synth.polyphony"].IntValue = 1024;
-                _settings["synth.cpu-cores"].IntValue = 2;
-                _settings["synth.overflow.age"].DoubleValue = 3000;
-                _settings["audio.driver"].StringValue = "file";
-                _settings["audio.periods"].IntValue = 8;
-                _settings["audio.period-size"].IntValue = 4096;
-                _settings["midi.autoconnect"].IntValue = 1;
-                _settings["player.reset-synth"].IntValue = 0;
-                _settings["synth.midi-bank-select"].StringValue = "gm";
-            }
-            catch (Exception e)
-            {
-                Logger.WarningS("midi",
-                    "Failed to initialize fluidsynth due to exception, disabling MIDI support:\n{0}", e);
-                _failedInitialize = true;
-                return;
-            }
-
-            _midiThread = new Thread(ThreadUpdate);
-            _midiThread.Start();
-
-            _broadPhaseSystem = EntitySystem.Get<SharedPhysicsSystem>();
-            FluidsynthInitialized = true;
-        }
-
-        private void LoggerDelegate(NFluidsynth.Logger.LogLevel level, string message, IntPtr data)
-        {
-            var rLevel = level switch {
-                NFluidsynth.Logger.LogLevel.Panic => LogLevel.Error,
-                NFluidsynth.Logger.LogLevel.Error => LogLevel.Error,
-                NFluidsynth.Logger.LogLevel.Warning => LogLevel.Warning,
-                NFluidsynth.Logger.LogLevel.Information => LogLevel.Info,
-                NFluidsynth.Logger.LogLevel.Debug => LogLevel.Debug,
-                _ => LogLevel.Debug
-            };
-            _sawmill.Log(rLevel, message);
-        }
-
-        public IMidiRenderer? GetNewRenderer()
-        {
-            if (!FluidsynthInitialized)
-            {
-                InitializeFluidsynth();
-
-                if (!FluidsynthInitialized) // init failed
-                {
-                    return null;
-                }
-            }
-
-            var soundfontLoader = SoundFontLoader.NewDefaultSoundFontLoader(_settings);
-
-            // Just making double sure these don't get GC'd.
-            // They shouldn't, MidiRenderer keeps a ref, but making sure...
-            var handle = GCHandle.Alloc(soundfontLoader);
-
-            try
-            {
-                soundfontLoader.SetCallbacks(_soundfontLoaderCallbacks);
-
-                var renderer = new MidiRenderer(_settings!, soundfontLoader);
-
-                foreach (var file in _resourceManager.ContentFindFiles(("/Audio/MidiCustom/")))
-                {
-                    if (file.Extension != "sf2" && file.Extension != "dls") continue;
-                    renderer.LoadSoundfont(file.ToString());
-                }
-
-                // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
-                renderer.LoadSoundfont(FallbackSoundfont);
-
-                if (OperatingSystem.IsLinux())
-                {
-                    foreach (var filepath in LinuxSoundfonts)
-                    {
-                        if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath)) continue;
-
-                        try
-                        {
-                            renderer.LoadSoundfont(filepath, true);
-                        }
-                        catch (Exception)
-                        {
-                            continue;
-                        }
-
-                        break;
-                    }
-                }
-                else if (OperatingSystem.IsMacOS())
-                {
-                    if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
-                        renderer.LoadSoundfont(OsxSoundfont, true);
-                }
-                else if (OperatingSystem.IsWindows())
-                {
-                    if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
-                        renderer.LoadSoundfont(WindowsSoundfont, true);
-                }
-
-                renderer.Source.SetVolume(Volume);
-
-                lock (_renderers)
-                {
-                    _renderers.Add(renderer);
-                }
-                return renderer;
-            }
-            finally
-            {
-                handle.Free();
+                return null;
             }
         }
 
-        public void FrameUpdate(float frameTime)
+        var soundfontLoader = SoundFontLoader.NewDefaultSoundFontLoader(_settings);
+
+        // Just making double sure these don't get GC'd.
+        // They shouldn't, MidiRenderer keeps a ref, but making sure...
+        var handle = GCHandle.Alloc(soundfontLoader);
+
+        try
         {
-            if (!FluidsynthInitialized)
+            soundfontLoader.SetCallbacks(_soundfontLoaderCallbacks);
+
+            var renderer = new MidiRenderer(_settings!, soundfontLoader, mono, this, _clydeAudio, _taskManager, _midiSawmill);
+
+            // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
+            renderer.LoadSoundfont(FallbackSoundfont);
+
+            if (OperatingSystem.IsLinux())
             {
-                return;
-            }
-
-            // Update positions of streams every frame.
-            foreach (var renderer in _renderers)
-            {
-                if (renderer.Disposed)
-                    continue;
-
-                if(_volumeDirty)
-                    renderer.Source.SetVolume(Volume);
-
-                if (!renderer.Mono)
+                foreach (var filepath in LinuxSoundfonts)
                 {
-                    renderer.Source.SetGlobal();
-                    continue;
-                }
+                    if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath)) continue;
 
-                MapCoordinates? mapPos = null;
-                var trackingEntity = renderer.TrackingEntity != null && !_entityManager.Deleted(renderer.TrackingEntity);
-                if (trackingEntity)
-                {
-                    renderer.TrackingCoordinates = _entityManager.GetComponent<TransformComponent>(renderer.TrackingEntity!.Value).Coordinates;
-                }
-
-                if (renderer.TrackingCoordinates != null)
-                {
-                    mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
-                }
-
-                if (mapPos != null && mapPos.Value.MapId == _eyeManager.CurrentMap)
-                {
-                    var pos = mapPos.Value;
-
-                    var sourceRelative = _eyeManager.CurrentEye.Position.Position - pos.Position;
-                    var occlusion = 0f;
-                    if (sourceRelative.Length > 0)
+                    try
                     {
-                        occlusion = _broadPhaseSystem.IntersectRayPenetration(
-                            pos.MapId,
-                            new CollisionRay(
-                                pos.Position,
-                                sourceRelative.Normalized,
-                                OcclusionCollisionMask),
-                            sourceRelative.Length,
-                            renderer.TrackingEntity);
+                        renderer.LoadSoundfont(filepath, true);
+                    }
+                    catch (Exception)
+                    {
+                        continue;
                     }
 
-                    renderer.Source.SetOcclusion(occlusion);
-
-                    if (!renderer.Source.SetPosition(pos.Position))
-                    {
-                        return;
-                    }
-
-                    if (trackingEntity)
-                    {
-                        renderer.Source.SetVelocity(renderer.TrackingEntity!.Value.GlobalLinearVelocity());
-                    }
-                }
-                else
-                {
-                    renderer.Source.SetOcclusion(float.MaxValue);
+                    break;
                 }
             }
-
-            _volumeDirty = false;
-        }
-
-        /// <summary>
-        ///     Main method for the thread rendering the midi audio.
-        /// </summary>
-        private void ThreadUpdate()
-        {
-            while (_alive)
+            else if (OperatingSystem.IsMacOS())
             {
-                lock (_renderers)
-                {
-                    for (var i = 0; i < _renderers.Count; i++)
-                    {
-                        var renderer = _renderers[i];
-                        if (!renderer.Disposed)
-                            renderer.Render();
-                        else
-                        {
-                            renderer.InternalDispose();
-                            _renderers.Remove(renderer);
-                        }
-                    }
-                }
-
-                Thread.Sleep(1);
+                if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
+                    renderer.LoadSoundfont(OsxSoundfont, true);
+            }
+            else if (OperatingSystem.IsWindows())
+            {
+                if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
+                    renderer.LoadSoundfont(WindowsSoundfont, true);
             }
-        }
 
-        public void Shutdown()
-        {
-            _alive = false;
-            _midiThread?.Join();
-            _settings?.Dispose();
+            // Load content-specific custom soundfonts, which could override the system/fallback soundfont.
+            foreach (var file in _resourceManager.ContentFindFiles(("/Audio/MidiCustom/")))
+            {
+                if (file.Extension != "sf2" && file.Extension != "dls") continue;
+                renderer.LoadSoundfont(file.ToString());
+            }
+
+            // Load every soundfont from the user data directory last, since those may override any other soundfont.
+            _midiSawmill.Debug($"loading soundfonts from {CustomSoundfontDirectory.ToRelativePath().ToString()}/*");
+            var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath().ToString()}/*").Item1;
+            foreach (var soundfont in enumerator)
+            {
+                if (soundfont.Extension != "sf2" && soundfont.Extension != "dls") continue;
+                _midiSawmill.Debug($"loading soundfont {soundfont}");
+                renderer.LoadSoundfont(soundfont.ToString());
+            }
+
+            renderer.Source.SetVolume(Volume);
 
             lock (_renderers)
             {
-                foreach (var renderer in _renderers)
-                {
-                    renderer?.Dispose();
-                }
+                _renderers.Add(renderer);
+            }
+            return renderer;
+        }
+        finally
+        {
+            handle.Free();
+        }
+    }
+
+    public void FrameUpdate(float frameTime)
+    {
+        if (!FluidsynthInitialized)
+        {
+            return;
+        }
+
+        // Update positions of streams every frame.
+        foreach (var renderer in _renderers)
+        {
+            if (renderer.Disposed)
+                continue;
+
+            if(_volumeDirty)
+                renderer.Source.SetVolume(Volume);
+
+            if (!renderer.Mono)
+            {
+                renderer.Source.SetGlobal();
+                continue;
             }
 
-            if (FluidsynthInitialized && !_failedInitialize)
+            MapCoordinates? mapPos = null;
+            var trackingEntity = renderer.TrackingEntity != null && !_entityManager.Deleted(renderer.TrackingEntity);
+            if (trackingEntity)
             {
-                NFluidsynth.Logger.SetLoggerMethod(null);
+                renderer.TrackingCoordinates = _entityManager.GetComponent<TransformComponent>(renderer.TrackingEntity!.Value).Coordinates;
+            }
+
+            if (renderer.TrackingCoordinates != null)
+            {
+                mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
+            }
+
+            if (mapPos != null && mapPos.Value.MapId == _eyeManager.CurrentMap)
+            {
+                var pos = mapPos.Value;
+
+                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),
+                        MathF.Min(sourceRelative.Length, MaxDistanceForOcclusion),
+                        renderer.TrackingEntity);
+                }
+
+                renderer.Source.SetOcclusion(occlusion);
+
+                if (!renderer.Source.SetPosition(pos.Position))
+                {
+                    return;
+                }
+
+                if (trackingEntity)
+                {
+                    renderer.Source.SetVelocity(renderer.TrackingEntity!.Value.GlobalLinearVelocity());
+                }
+            }
+            else
+            {
+                renderer.Source.SetOcclusion(float.MaxValue);
             }
         }
 
-        /// <summary>
-        ///     This class is used to load soundfonts.
-        /// </summary>
-        private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
+        _volumeDirty = false;
+    }
+
+    /// <summary>
+    ///     Main method for the thread rendering the midi audio.
+    /// </summary>
+    private void ThreadUpdate()
+    {
+        while (_alive)
         {
-            private readonly Dictionary<int, Stream> _openStreams = new();
-            private int _nextStreamId = 1;
-
-            public override IntPtr Open(string filename)
+            lock (_renderers)
             {
-                if (string.IsNullOrEmpty(filename))
+                for (var i = 0; i < _renderers.Count; i++)
                 {
-                    return IntPtr.Zero;
+                    var renderer = _renderers[i];
+                    if (!renderer.Disposed)
+                        renderer.Render();
+                    else
+                    {
+                        renderer.InternalDispose();
+                        _renderers.Remove(renderer);
+                    }
                 }
+            }
 
-                Stream? stream;
-                var resourceCache = IoCManager.Resolve<IResourceCache>();
-                var resourcePath = new ResourcePath(filename);
+            Thread.Sleep(1);
+        }
+    }
 
-                if (resourcePath.IsRooted && resourceCache.ContentFileExists(filename))
+    public void Shutdown()
+    {
+        _alive = false;
+        _midiThread?.Join();
+        _settings?.Dispose();
+
+        lock (_renderers)
+        {
+            foreach (var renderer in _renderers)
+            {
+                renderer?.Dispose();
+            }
+        }
+
+        if (FluidsynthInitialized && !_failedInitialize)
+        {
+            NFluidsynth.Logger.SetLoggerMethod(null);
+        }
+    }
+
+    /// <summary>
+    ///     Internal method to get a human-readable representation of a <see cref="SequencerEvent"/>.
+    /// </summary>
+    internal static string SequencerEventToString(SequencerEvent midiEvent)
+    {
+        // ReSharper disable once UseStringInterpolation
+        return string.Format(
+            "{0} chan:{1:D2} key:{2:D5} bank:{3:D2} ctrl:{4:D5} dur:{5:D5} pitch:{6:D5} prog:{7:D3} val:{8:D5} vel:{9:D5}",
+            midiEvent.Type.ToString().PadLeft(22),
+            midiEvent.Channel,
+            midiEvent.Key,
+            midiEvent.Bank,
+            midiEvent.Control,
+            midiEvent.Duration,
+            midiEvent.Pitch,
+            midiEvent.Program,
+            midiEvent.Value,
+            midiEvent.Velocity);
+    }
+
+    /// <summary>
+    ///     This class is used to load soundfonts.
+    /// </summary>
+    private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
+    {
+        private readonly Dictionary<int, Stream> _openStreams = new();
+        private int _nextStreamId = 1;
+
+        public override IntPtr Open(string filename)
+        {
+            if (string.IsNullOrEmpty(filename))
+            {
+                return IntPtr.Zero;
+            }
+
+            Stream? stream;
+            var resourceCache = IoCManager.Resolve<IResourceCache>();
+            var resourcePath = new ResourcePath(filename);
+
+            if (resourcePath.IsRooted)
+            {
+                // is it in content?
+                if (resourceCache.ContentFileExists(filename))
                 {
                     if (!resourceCache.TryContentFileRead(filename, out stream))
                         return IntPtr.Zero;
                 }
+                // is it in userdata?
+                else if (resourceCache.UserData.Exists(resourcePath))
+                {
+                    stream = resourceCache.UserData.OpenRead(resourcePath);
+                }
                 else if (File.Exists(filename))
                 {
                     stream = File.OpenRead(filename);
@@ -421,73 +458,81 @@ namespace Robust.Client.Audio.Midi
                 {
                     return IntPtr.Zero;
                 }
-
-                var id = _nextStreamId++;
-
-                _openStreams.Add(id, stream);
-
-                return (IntPtr) id;
+            }
+            else if (File.Exists(filename))
+            {
+                stream = File.OpenRead(filename);
+            }
+            else
+            {
+                return IntPtr.Zero;
             }
 
-            public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
-            {
-                var length = (int) count;
-                var span = new Span<byte>(buf.ToPointer(), length);
-                var stream = _openStreams[(int) sfHandle];
+            var id = _nextStreamId++;
 
-                // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
-                try
+            _openStreams.Add(id, stream);
+
+            return (IntPtr) id;
+        }
+
+        public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
+        {
+            var length = (int) count;
+            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).
+                if (count < 1024)
                 {
-                    // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
-                    if (count < 1024)
-                    {
-                        // ReSharper disable once SuggestVarOrType_Elsewhere
-                        Span<byte> buffer = stackalloc byte[(int)count];
+                    // ReSharper disable once SuggestVarOrType_Elsewhere
+                    Span<byte> buffer = stackalloc byte[(int)count];
 
-                        stream.ReadExact(buffer);
+                    stream.ReadExact(buffer);
 
-                        buffer.CopyTo(span);
-                    }
-                    else
-                    {
-                        var buffer = stream.ReadExact(length);
-
-                        buffer.CopyTo(span);
-                    }
+                    buffer.CopyTo(span);
                 }
-                catch (EndOfStreamException)
+                else
                 {
-                    return -1;
+                    var buffer = stream.ReadExact(length);
+
+                    buffer.CopyTo(span);
                 }
-
-                return 0;
             }
-
-            public override int Seek(IntPtr sfHandle, int offset, SeekOrigin origin)
+            catch (EndOfStreamException)
             {
-                var stream = _openStreams[(int) sfHandle];
-
-                stream.Seek(offset, origin);
-
-                return 0;
+                return -1;
             }
 
-            public override int Tell(IntPtr sfHandle)
-            {
-                var stream = _openStreams[(int) sfHandle];
+            return 0;
+        }
 
-                return (int) stream.Position;
-            }
+        public override int Seek(IntPtr sfHandle, int offset, SeekOrigin origin)
+        {
+            var stream = _openStreams[(int) sfHandle];
 
-            public override int Close(IntPtr sfHandle)
-            {
-                if (!_openStreams.Remove((int) sfHandle, out var stream))
-                    return -1;
+            stream.Seek(offset, origin);
 
-                stream.Dispose();
-                return 0;
+            return 0;
+        }
+
+        public override int Tell(IntPtr sfHandle)
+        {
+            var stream = _openStreams[(int) sfHandle];
+
+            return (int) stream.Position;
+        }
+
+        public override int Close(IntPtr sfHandle)
+        {
+            if (!_openStreams.Remove((int) sfHandle, out var stream))
+                return -1;
+
+            stream.Dispose();
+            return 0;
 
-            }
         }
     }
 }

Robust.Client/BaseClient.cs

@@ -13,6 +13,7 @@ using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Network;
+using Robust.Shared.Network.Messages;
 using Robust.Shared.Players;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
@@ -26,7 +27,6 @@ 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!;
@@ -46,6 +46,8 @@ namespace Robust.Client
 
         public string? LastDisconnectReason { get; private set; }
 
+        private (TimeSpan, GameTick) _timeBase;
+
         /// <inheritdoc />
         public void Initialize()
         {
@@ -53,20 +55,34 @@ namespace Robust.Client
             _net.ConnectFailed += OnConnectFailed;
             _net.Disconnect += OnNetDisconnect;
 
+            _net.RegisterNetMessage<MsgSyncTimeBase>(
+                SyncTimeBase,
+                NetMessageAccept.Handshake | NetMessageAccept.Client);
+
             _configManager.OnValueChanged(CVars.NetTickrate, TickRateChanged, invokeImmediately: true);
 
             _playMan.Initialize();
             Reset();
         }
 
-        private void TickRateChanged(int tickrate)
+        private void SyncTimeBase(MsgSyncTimeBase message)
+        {
+            Logger.DebugS("client", $"Synchronized time base: {message.Tick}: {message.Time}");
+
+            if (RunLevel >= ClientRunLevel.Connected)
+                _timing.TimeBase = (message.Time, message.Tick);
+            else
+                _timeBase = (message.Time, message.Tick);
+        }
+
+        private void TickRateChanged(int tickrate, in CVarChangeInfo info)
         {
             if (GameInfo != null)
             {
                 GameInfo.TickRate = (byte) tickrate;
             }
 
-            _timing.TickRate = (byte) tickrate;
+            _timing.SetTickRateAt((byte) tickrate, info.TickChanged);
             Logger.InfoS("client", $"Tickrate changed to: {tickrate} on tick {_timing.CurTick}");
         }
 
@@ -75,7 +91,7 @@ namespace Robust.Client
         {
             if (RunLevel == ClientRunLevel.Connecting)
             {
-                _net.Shutdown("Client mashing that connect button.");
+                _net.Reset("Client mashing that connect button.");
                 Reset();
             }
 
@@ -213,9 +229,8 @@ namespace Robust.Client
         {
             _entityManager.Startup();
             _mapManager.Startup();
-            _entityLookup.Startup();
 
-            _timing.ResetSimTime();
+            _timing.ResetSimTime(_timeBase);
             _timing.Paused = false;
         }
 
@@ -224,7 +239,6 @@ namespace Robust.Client
             IoCManager.Resolve<INetConfigurationManager>().FlushMessages();
             _gameStates.Reset();
             _playMan.Shutdown();
-            _entityLookup.Shutdown();
             _entityManager.Shutdown();
             _mapManager.Shutdown();
             _discord.ClearPresence();

Robust.Client/ClientIoC.cs

@@ -11,6 +11,7 @@ using Robust.Client.Input;
 using Robust.Client.Map;
 using Robust.Client.Placement;
 using Robust.Client.Player;
+using Robust.Client.Profiling;
 using Robust.Client.Prototypes;
 using Robust.Client.Reflection;
 using Robust.Client.ResourceManagement;
@@ -47,7 +48,6 @@ namespace Robust.Client
             IoCManager.Register<IMapManagerInternal, NetworkedMapManager>();
             IoCManager.Register<INetworkedMapManager, NetworkedMapManager>();
             IoCManager.Register<IEntityManager, ClientEntityManager>();
-            IoCManager.Register<IEntityLookup, EntityLookup>();
             IoCManager.Register<IReflectionManager, ClientReflectionManager>();
             IoCManager.Register<IConsoleHost, ClientConsoleHost>();
             IoCManager.Register<IClientConsoleHost, ClientConsoleHost>();
@@ -62,6 +62,7 @@ namespace Robust.Client
             IoCManager.Register<IResourceCache, ResourceCache>();
             IoCManager.Register<IResourceCacheInternal, ResourceCache>();
             IoCManager.Register<IClientNetManager, NetManager>();
+            IoCManager.Register<EntityManager, ClientEntityManager>();
             IoCManager.Register<IClientEntityManager, ClientEntityManager>();
             IoCManager.Register<IClientEntityManagerInternal, ClientEntityManager>();
             IoCManager.Register<IEntityNetworkManager, ClientEntityManager>();
@@ -72,11 +73,11 @@ namespace Robust.Client
             IoCManager.Register<IStateManager, StateManager>();
             IoCManager.Register<IUserInterfaceManager, UserInterfaceManager>();
             IoCManager.Register<IUserInterfaceManagerInternal, UserInterfaceManager>();
-            IoCManager.Register<IDebugDrawing, DebugDrawing>();
             IoCManager.Register<ILightManager, LightManager>();
             IoCManager.Register<IDiscordRichPresence, DiscordRichPresence>();
             IoCManager.Register<IMidiManager, MidiManager>();
             IoCManager.Register<IAuthManager, AuthManager>();
+            IoCManager.Register<ProfViewManager>();
             IoCManager.Register<IPhysicsManager, PhysicsManager>();
             switch (mode)
             {

Robust.Client/Console/ClientConsoleHost.Completions.cs

@@ -0,0 +1,94 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Robust.Shared;
+using Robust.Shared.Console;
+using Robust.Shared.Network.Messages;
+
+namespace Robust.Client.Console;
+
+internal sealed partial class ClientConsoleHost
+{
+    private readonly Dictionary<int, PendingCompletion> _completionsPending = new();
+    private int _completionSeq;
+
+
+    public async Task<CompletionResult> GetCompletions(List<string> args, CancellationToken cancel)
+    {
+        // Last element is the command currently being typed. May be empty.
+
+        // Logger.Debug($"Running completions: {string.Join(", ", args)}");
+
+        var delay = _cfg.GetCVar(CVars.ConCompletionDelay);
+        if (delay > 0)
+            await Task.Delay((int)(delay * 1000), cancel);
+
+        return await CalcCompletions(args, cancel);
+    }
+
+    private Task<CompletionResult> CalcCompletions(List<string> args, CancellationToken cancel)
+    {
+        if (args.Count == 1)
+        {
+            // Typing out command name, handle this ourselves.
+            var cmdOptions = CompletionResult.FromOptions(
+                RegisteredCommands.Values.Select(c => new CompletionOption(c.Command, c.Description)));
+            return Task.FromResult(cmdOptions);
+        }
+
+        if (!RegisteredCommands.TryGetValue(args[0], out var cmd))
+            return Task.FromResult(CompletionResult.Empty);
+
+        return cmd.GetCompletionAsync(LocalShell, args.ToArray()[1..], cancel).AsTask();
+    }
+
+    private Task<CompletionResult> DoServerCompletions(List<string> args, CancellationToken cancel)
+    {
+        var tcs = new TaskCompletionSource<CompletionResult>();
+        var cts = CancellationTokenSource.CreateLinkedTokenSource(cancel);
+        var seq = _completionSeq++;
+
+        var pending = new PendingCompletion
+        {
+            Cts = cts,
+            Tcs = tcs
+        };
+
+        var msg = new MsgConCompletion
+        {
+            Args = args.ToArray(),
+            Seq = seq
+        };
+
+        cts.Token.Register(() =>
+        {
+            tcs.SetCanceled(cts.Token);
+            cts.Dispose();
+            _completionsPending.Remove(seq);
+        }, true);
+
+        NetManager.ClientSendMessage(msg);
+
+        _completionsPending.Add(seq, pending);
+
+        return tcs.Task;
+    }
+
+    private void ProcessCompletionResp(MsgConCompletionResp message)
+    {
+        if (!_completionsPending.TryGetValue(message.Seq, out var pending))
+            return;
+
+        pending.Cts.Dispose();
+        pending.Tcs.SetResult(message.Result);
+
+        _completionsPending.Remove(message.Seq);
+    }
+
+    private struct PendingCompletion
+    {
+        public TaskCompletionSource<CompletionResult> Tcs;
+        public CancellationTokenSource Cts;
+    }
+}

Robust.Client/Console/ClientConsoleHost.cs

@@ -1,10 +1,15 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using Robust.Client.Log;
 using Robust.Client.Player;
+using Robust.Shared.Configuration;
 using Robust.Shared.Console;
 using Robust.Shared.Enums;
 using Robust.Shared.IoC;
+using Robust.Shared.Localization;
 using Robust.Shared.Log;
 using Robust.Shared.Network;
 using Robust.Shared.Network.Messages;
@@ -41,18 +46,23 @@ namespace Robust.Client.Console
     }
 
     /// <inheritdoc cref="IClientConsoleHost" />
-    internal sealed class ClientConsoleHost : ConsoleHost, IClientConsoleHost
+    internal sealed partial class ClientConsoleHost : ConsoleHost, IClientConsoleHost, IConsoleHostInternal
     {
         [Dependency] private readonly IClientConGroupController _conGroup = default!;
+        [Dependency] private readonly IConfigurationManager _cfg = default!;
 
         private bool _requestedCommands;
 
+        public ClientConsoleHost() : base(isServer: false) {}
+
         /// <inheritdoc />
         public void Initialize()
         {
             NetManager.RegisterNetMessage<MsgConCmdReg>(HandleConCmdReg);
             NetManager.RegisterNetMessage<MsgConCmdAck>(HandleConCmdAck);
             NetManager.RegisterNetMessage<MsgConCmd>(ProcessCommand);
+            NetManager.RegisterNetMessage<MsgConCompletion>();
+            NetManager.RegisterNetMessage<MsgConCompletionResp>(ProcessCompletionResp);
 
             _requestedCommands = false;
             NetManager.Connected += OnNetworkConnected;
@@ -88,6 +98,11 @@ namespace Robust.Client.Console
             OutputText(text, true, true);
         }
 
+        public bool IsCmdServer(IConsoleCommand cmd)
+        {
+            return cmd is ServerDummyCommand;
+        }
+
         public override event ConAnyCommandCallback? AnyCommandExecuted;
 
         /// <inheritdoc />
@@ -108,14 +123,14 @@ namespace Robust.Client.Console
 
             if (AvailableCommands.ContainsKey(commandName))
             {
+#if !DEBUG
                 var playerManager = IoCManager.Resolve<IPlayerManager>();
-
                 if (!_conGroup.CanCommand(commandName) && playerManager.LocalPlayer?.Session.Status > SessionStatus.Connecting)
                 {
                     WriteError(null, $"Insufficient perms for command: {commandName}");
                     return;
                 }
-
+#endif
                 var command1 = AvailableCommands[commandName];
                 args.RemoveAt(0);
                 var shell = new ConsoleShell(this, null);
@@ -134,7 +149,7 @@ namespace Robust.Client.Console
             if (!NetManager.IsConnected) // we don't care about session on client
                 return;
 
-            var msg = NetManager.CreateNetMessage<MsgConCmd>();
+            var msg = new MsgConCmd();
             msg.Text = command;
             NetManager.ClientSendMessage(msg);
         }
@@ -198,36 +213,69 @@ namespace Robust.Client.Console
             if (!NetManager.IsConnected)
                 return;
 
-            var msg = NetManager.CreateNetMessage<MsgConCmdReg>();
+            var msg = new MsgConCmdReg();
             NetManager.ClientSendMessage(msg);
 
             _requestedCommands = true;
         }
-    }
 
-    /// <summary>
-    /// These dummies are made purely so list and help can list server-side commands.
-    /// </summary>
-    [Reflect(false)]
-    internal sealed class ServerDummyCommand : IConsoleCommand
-    {
-        internal ServerDummyCommand(string command, string help, string description)
+        /// <summary>
+        /// These dummies are made purely so list and help can list server-side commands.
+        /// </summary>
+        [Reflect(false)]
+        private sealed class ServerDummyCommand : IConsoleCommand
         {
-            Command = command;
-            Help = help;
-            Description = description;
+            internal ServerDummyCommand(string command, string help, string description)
+            {
+                Command = command;
+                Help = help;
+                Description = description;
+            }
+
+            public string Command { get; }
+
+            public string Description { get; }
+
+            public string Help { get; }
+
+            // Always forward to server.
+            public void Execute(IConsoleShell shell, string argStr, string[] args)
+            {
+                shell.RemoteExecuteCommand(argStr);
+            }
+
+            public async ValueTask<CompletionResult> GetCompletionAsync(
+                IConsoleShell shell,
+                string[] args,
+                CancellationToken cancel)
+            {
+                var host = (ClientConsoleHost)shell.ConsoleHost;
+                var argsList = args.ToList();
+                argsList.Insert(0, Command);
+
+                return await host.DoServerCompletions(argsList, cancel);
+            }
         }
 
-        public string Command { get; }
-
-        public string Description { get; }
-
-        public string Help { get; }
-
-        // Always forward to server.
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        private sealed class RemoteExecCommand : IConsoleCommand
         {
-            shell.RemoteExecuteCommand(argStr);
+            public string Command => ">";
+            public string Description => Loc.GetString("cmd-remoteexec-desc");
+            public string Help => Loc.GetString("cmd-remoteexec-help");
+
+            public void Execute(IConsoleShell shell, string argStr, string[] args)
+            {
+                shell.RemoteExecuteCommand(argStr["> ".Length..]);
+            }
+
+            public async ValueTask<CompletionResult> GetCompletionAsync(
+                IConsoleShell shell,
+                string[] args,
+                CancellationToken cancel)
+            {
+                var host = (ClientConsoleHost)shell.ConsoleHost;
+                return await host.DoServerCompletions(args.ToList(), cancel);
+            }
         }
     }
 }

Robust.Client/Console/Commands/ConfigurationCommands.cs

@@ -1,5 +1,3 @@
-using System;
-using System.Linq;
 using JetBrains.Annotations;
 using Robust.Shared.Configuration;
 using Robust.Shared.Console;
@@ -7,57 +5,6 @@ using Robust.Shared.IoC;
 
 namespace Robust.Client.Console.Commands
 {
-    [UsedImplicitly]
-    internal sealed class CVarCommand : SharedCVarCommand, IConsoleCommand
-    {
-        public override void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            if (args.Length < 1 || args.Length > 2)
-            {
-                shell.WriteError("Must provide exactly one or two arguments.");
-                return;
-            }
-
-            var configManager = IoCManager.Resolve<IConfigurationManager>();
-            var name = args[0];
-
-            if (name == "?")
-            {
-                var cvars = configManager.GetRegisteredCVars().OrderBy(c => c);
-                shell.WriteLine(string.Join("\n", cvars));
-                return;
-            }
-
-            if (!configManager.IsCVarRegistered(name))
-            {
-                shell.WriteError($"CVar '{name}' is not registered. Use 'cvar ?' to get a list of all registered CVars.");
-                return;
-            }
-
-            if (args.Length == 1)
-            {
-                // Read CVar
-                var value = configManager.GetCVar<object>(name);
-                shell.WriteLine(value.ToString() ?? "");
-            }
-            else
-            {
-                // Write CVar
-                var value = args[1];
-                var type = configManager.GetCVarType(name);
-                try
-                {
-                    var parsed = ParseObject(type, value);
-                    configManager.SetCVar(name, parsed);
-                }
-                catch (FormatException)
-                {
-                    shell.WriteLine($"Input value is in incorrect format for type {type}");
-                }
-            }
-        }
-    }
-
     [UsedImplicitly]
     public sealed class SaveConfig : IConsoleCommand
     {

Robust.Client/Console/Commands/Debug.cs

@@ -168,7 +168,7 @@ namespace Robust.Client.Console.Commands
 
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            var mgr = IoCManager.Resolve<IDebugDrawing>();
+            var mgr = EntitySystem.Get<DebugDrawingSystem>();
             mgr.DebugPositions = !mgr.DebugPositions;
         }
     }
@@ -739,103 +739,6 @@ namespace Robust.Client.Console.Commands
         }
     }
 
-    internal sealed class GcCommand : IConsoleCommand
-    {
-        public string Command => "gc";
-        public string Description => "Run the GC.";
-        public string Help => "gc [generation]";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            if (args.Length == 0)
-            {
-                GC.Collect();
-            }
-            else
-            {
-                if (int.TryParse(args[0], out int result))
-                    GC.Collect(result);
-                else
-                    shell.WriteError("Failed to parse argument.");
-            }
-        }
-    }
-
-    internal sealed class GcFullCommand : IConsoleCommand
-    {
-        public string Command => "gcf";
-        public string Description => "Run the GC, fully, compacting LOH and everything.";
-        public string Help => "gcf";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            GCSettings.LargeObjectHeapCompactionMode = GCLargeObjectHeapCompactionMode.CompactOnce;
-            GC.Collect(2, GCCollectionMode.Forced, true, true);
-        }
-    }
-
-    internal sealed class GcModeCommand : IConsoleCommand
-    {
-
-        public string Command => "gc_mode";
-
-        public string Description => "Change/Read the GC Latency mode.";
-
-        public string Help => "gc_mode\nSee current GC Latencymode\ngc_mode [type]\n Change GC Latency mode to [type]";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            var prevMode = GCSettings.LatencyMode;
-            if (args.Length == 0)
-            {
-                shell.WriteLine($"current gc latency mode: {(int) prevMode} ({prevMode})");
-                shell.WriteLine("possible modes:");
-                foreach (int mode in (int[]) Enum.GetValues(typeof(GCLatencyMode)))
-                {
-                    shell.WriteLine($" {mode}: {Enum.GetName(typeof(GCLatencyMode), mode)}");
-                }
-            }
-            else
-            {
-                GCLatencyMode mode;
-                if (char.IsDigit(args[0][0]) && int.TryParse(args[0], out var modeNum))
-                {
-                    mode = (GCLatencyMode) modeNum;
-                }
-                else if (!Enum.TryParse(args[0], true, out mode))
-                {
-                    shell.WriteLine($"unknown gc latency mode: {args[0]}");
-                    return;
-                }
-
-                shell.WriteLine($"attempting gc latency mode change: {(int) prevMode} ({prevMode}) -> {(int) mode} ({mode})");
-                GCSettings.LatencyMode = mode;
-                shell.WriteLine($"resulting gc latency mode: {(int) GCSettings.LatencyMode} ({GCSettings.LatencyMode})");
-            }
-        }
-
-    }
-
-    internal sealed class SerializeStatsCommand : IConsoleCommand
-    {
-
-        public string Command => "szr_stats";
-
-        public string Description => "Report serializer statistics.";
-
-        public string Help => "szr_stats";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-
-            shell.WriteLine($"serialized: {RobustSerializer.BytesSerialized} bytes, {RobustSerializer.ObjectsSerialized} objects");
-            shell.WriteLine($"largest serialized: {RobustSerializer.LargestObjectSerializedBytes} bytes, {RobustSerializer.LargestObjectSerializedType} objects");
-            shell.WriteLine($"deserialized: {RobustSerializer.BytesDeserialized} bytes, {RobustSerializer.ObjectsDeserialized} objects");
-            shell.WriteLine($"largest serialized: {RobustSerializer.LargestObjectDeserializedBytes} bytes, {RobustSerializer.LargestObjectDeserializedType} objects");
-        }
-
-    }
-
     internal sealed class ChunkInfoCommand : IConsoleCommand
     {
         public string Command => "chunkinfo";
@@ -861,7 +764,7 @@ namespace Robust.Client.Console.Commands
             var chunkIndex = grid.LocalToChunkIndices(grid.MapToGrid(mousePos));
             var chunk = internalGrid.GetChunk(chunkIndex);
 
-            shell.WriteLine($"worldBounds: {chunk.CalcWorldAABB()} localBounds: {chunk.CalcLocalBounds()}");
+            shell.WriteLine($"worldBounds: {internalGrid.CalcWorldAABB(chunk)} localBounds: {chunk.CachedBounds}");
         }
     }
 

Robust.Client/Console/Commands/HelpCommands.cs

@@ -1,73 +0,0 @@
-using System.Linq;
-using Robust.Shared.Console;
-using Robust.Shared.IoC;
-using Robust.Shared.Network;
-
-namespace Robust.Client.Console.Commands
-{
-    sealed class HelpCommand : IConsoleCommand
-    {
-        public string Command => "help";
-        public string Help => "When no arguments are provided, displays a generic help text. When an argument is passed, display the help text for the command with that name.";
-        public string Description => "Display help text.";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            switch (args.Length)
-            {
-                case 0:
-                    shell.WriteLine("To display help for a specific command, write 'help <command>'. To list all available commands, write 'list'.");
-                    break;
-
-                case 1:
-                    string commandname = args[0];
-                    if (!shell.ConsoleHost.RegisteredCommands.ContainsKey(commandname))
-                    {
-                        if (!IoCManager.Resolve<IClientNetManager>().IsConnected)
-                        {
-                            // No server so nothing to respond with unknown command.
-                            shell.WriteError("Unknown command: " + commandname);
-                            return;
-                        }
-                        // TODO: Maybe have a server side help?
-                        return;
-                    }
-                    IConsoleCommand command = shell.ConsoleHost.RegisteredCommands[commandname];
-                    shell.WriteLine(string.Format("{0} - {1}", command.Command, command.Description));
-                    shell.WriteLine(command.Help);
-                    break;
-
-                default:
-                    shell.WriteError("Invalid amount of arguments.");
-                    break;
-            }
-        }
-    }
-
-    sealed class ListCommand : IConsoleCommand
-    {
-        public string Command => "list";
-        public string Help => "Usage: list [filter]\n" +
-                              "Lists all available commands, and their short descriptions.\n" +
-                              "If a filter is provided, " +
-                              "only commands that contain the given string in their name will be listed.";
-        public string Description => "List all commands, optionally with a filter.";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            var filter = "";
-            if (args.Length == 1)
-            {
-                filter = args[0];
-            }
-
-            var conGroup = IoCManager.Resolve<IClientConGroupController>();
-            foreach (var command in shell.ConsoleHost.RegisteredCommands.Values
-                .Where(p => p.Command.Contains(filter) && (p is not ServerDummyCommand || conGroup.CanCommand(p.Command)))
-                .OrderBy(c => c.Command))
-            {
-                shell.WriteLine(command.Command + ": " + command.Description);
-            }
-        }
-    }
-}

Robust.Client/Console/Commands/ListAssembliesCommand.cs

@@ -1,27 +0,0 @@
-using System.Linq;
-using System.Runtime.Loader;
-using JetBrains.Annotations;
-using Robust.Shared.Console;
-
-namespace Robust.Client.Console.Commands
-{
-    [UsedImplicitly]
-    internal sealed class ListAssembliesCommand : IConsoleCommand
-    {
-        public string Command => "lsasm";
-        public string Description => "Lists loaded assemblies by load context.";
-        public string Help => Command;
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            foreach (var context in AssemblyLoadContext.All)
-            {
-                shell.WriteLine($"{context.Name}:");
-                foreach (var assembly in context.Assemblies.OrderBy(a => a.FullName))
-                {
-                    shell.WriteLine($"  {assembly.FullName}");
-                }
-            }
-        }
-    }
-}

Robust.Client/Console/Commands/LogCommands.cs

@@ -1,73 +0,0 @@
-using Robust.Shared.Log;
-using System;
-using Robust.Shared.Console;
-
-namespace Robust.Client.Console.Commands
-{
-    sealed class LogSetLevelCommand : IConsoleCommand
-    {
-        public string Command => "loglevel";
-        public string Description => "Changes the log level for a provided sawmill.";
-        public string Help => "Usage: loglevel <sawmill> <level>"
-                            + "\n    sawmill: A label prefixing log messages. This is the one you're setting the level for."
-                            + "\n    level: The log level. Must match one of the values of the LogLevel enum.";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            if (args.Length != 2)
-            {
-                shell.WriteError("Invalid argument amount. Expected 2 arguments.");
-                return;
-            }
-
-            var name = args[0];
-            var levelname = args[1];
-            LogLevel? level;
-            if (levelname == "null")
-            {
-                level = null;
-            }
-            else
-            {
-                if (!Enum.TryParse<LogLevel>(levelname, out var result))
-                {
-                    shell.WriteLine("Failed to parse 2nd argument. Must be one of the values of the LogLevel enum.");
-                    return;
-                }
-                level = result;
-            }
-            Logger.GetSawmill(name).Level = level;
-        }
-    }
-
-    sealed class TestLog : IConsoleCommand
-    {
-        public string Command => "testlog";
-        public string Description => "Writes a test log to a sawmill.";
-        public string Help => "Usage: testlog <sawmill> <level> <message>"
-                            + "\n    sawmill: A label prefixing the logged message."
-                            + "\n    level: The log level. Must match one of the values of the LogLevel enum."
-                            + "\n    message: The message to be logged. Wrap this in double quotes if you want to use spaces.";
-
-        public void Execute(IConsoleShell shell, string argStr, string[] args)
-        {
-            if (args.Length != 3)
-            {
-                shell.WriteError("Invalid argument amount. Expected 3 arguments.");
-                return;
-            }
-
-            var name = args[0];
-            var levelname = args[1];
-            var message = args[2]; // yes this doesn't support spaces idgaf.
-            if (!Enum.TryParse<LogLevel>(levelname, out var result))
-            {
-                shell.WriteLine("Failed to parse 2nd argument. Must be one of the values of the LogLevel enum.");
-                return;
-            }
-            var level = result;
-
-            Logger.LogS(level, name, message);
-        }
-    }
-}

Robust.Client/Console/Commands/PhysicsOverlayCommands.cs

@@ -1,6 +1,7 @@
 using Robust.Client.Debugging;
 using Robust.Shared.Console;
 using Robust.Shared.GameObjects;
+using Robust.Shared.Localization;
 
 namespace Robust.Client.Console.Commands
 {
@@ -8,12 +9,13 @@ namespace Robust.Client.Console.Commands
     {
         public string Command => "physics";
         public string Description => $"Shows a debug physics overlay. The arg supplied specifies the overlay.";
-        public string Help => $"{Command} <aabbs / contactnormals / contactpoints / joints / shapeinfo / shapes>";
+        public string Help => $"{Command} <aabbs / com / contactnormals / contactpoints / joints / shapeinfo / shapes>";
+
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
             if (args.Length != 1)
             {
-                shell.WriteLine($"Invalid number of args supplied");
+                shell.WriteError(Loc.GetString("shell-wrong-arguments-number-need-specific", ("properAmount", 1), ("currentAmount", args.Length)));
                 return;
             }
 
@@ -43,11 +45,27 @@ namespace Robust.Client.Console.Commands
                     system.Flags ^= PhysicsDebugFlags.Shapes;
                     break;
                 default:
-                    shell.WriteLine($"{args[0]} is not a recognised overlay");
+                    shell.WriteError(Loc.GetString("cmd-physics-overlay", ("overlay", args[0])));
                     return;
             }
 
             return;
         }
+
+        public CompletionResult GetCompletion(IConsoleShell shell, string[] args)
+        {
+            if (args.Length != 1) return CompletionResult.Empty;
+
+            return CompletionResult.FromOptions(new[]
+            {
+                "aabbs",
+                "com",
+                "contactnormals",
+                "contactpoints",
+                "joints",
+                "shapeinfo",
+                "shapes",
+            });
+        }
     }
 }

Robust.Client/Console/Commands/SendGarbageCommand.cs

@@ -15,7 +15,7 @@ namespace Robust.Client.Console.Commands
             // MsgStringTableEntries is registered as NetMessageAccept.Client so the server will immediately deny it.
             // And kick us.
             var net = IoCManager.Resolve<IClientNetManager>();
-            var msg = net.CreateNetMessage<MsgStringTableEntries>();
+            var msg = new MsgStringTableEntries();
             msg.Entries = new MsgStringTableEntries.Entry[0];
             net.ClientSendMessage(msg);
         }

Robust.Client/Console/IClientConsoleHost.cs

@@ -1,4 +1,7 @@
 using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 using Robust.Shared.Console;
 using Robust.Shared.Utility;
 
@@ -15,5 +18,7 @@ namespace Robust.Client.Console
         event EventHandler<AddFormattedMessageArgs> AddFormatted;
 
         void AddFormattedLine(FormattedMessage message);
+
+        Task<CompletionResult> GetCompletions(List<string> args, CancellationToken cancel);
     }
 }

Robust.Client/Console/ScriptClient.ScriptConsoleServer.cs

@@ -35,7 +35,7 @@ namespace Robust.Client.Console
 
                 RunButton.Disabled = true;
 
-                var msg = _client._netManager.CreateNetMessage<MsgScriptEval>();
+                var msg = new MsgScriptEval();
                 msg.ScriptSession = _session;
                 msg.Code = _lastEnteredText = InputBar.Text;
 
@@ -48,7 +48,7 @@ namespace Robust.Client.Console
 
             protected override void Complete()
             {
-                var msg = _client._netManager.CreateNetMessage<MsgScriptCompletion>();
+                var msg = new MsgScriptCompletion();
                 msg.ScriptSession = _session;
                 msg.Code = InputBar.Text;
                 msg.Cursor = InputBar.CursorPosition;

Robust.Client/Console/ScriptClient.cs

@@ -65,7 +65,7 @@ namespace Robust.Client.Console
                 throw new InvalidOperationException("We do not have scripting permission.");
             }
 
-            var msg = _netManager.CreateNetMessage<MsgScriptStart>();
+            var msg = new MsgScriptStart();
             msg.ScriptSession = _nextSessionId++;
             _netManager.ClientSendMessage(msg);
         }
@@ -74,7 +74,7 @@ namespace Robust.Client.Console
         {
             _activeConsoles.Remove(session);
 
-            var msg = _netManager.CreateNetMessage<MsgScriptStop>();
+            var msg = new MsgScriptStop();
             msg.ScriptSession = session;
             _netManager.ClientSendMessage(msg);
         }

Robust.Client/Debugging/DebugDrawingSystem.cs

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

Robust.Client/Debugging/DebugPhysicsSystem.cs

@@ -52,6 +52,7 @@ using Robust.Client.ResourceManagement;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Physics;
 using Robust.Shared.Physics.Collision;
@@ -88,6 +89,7 @@ namespace Robust.Client.Debugging
                             EntityManager,
                             IoCManager.Resolve<IEyeManager>(),
                             IoCManager.Resolve<IInputManager>(),
+                            IoCManager.Resolve<IMapManager>(),
                             IoCManager.Resolve<IResourceCache>(),
                             this,
                             Get<SharedPhysicsSystem>()));
@@ -151,10 +153,12 @@ namespace Robust.Client.Debugging
         /// Shows the world point for each contact in the viewport.
         /// </summary>
         ContactPoints = 1 << 0,
+
         /// <summary>
         /// Shows the world normal for each contact in the viewport.
         /// </summary>
         ContactNormals = 1 << 1,
+
         /// <summary>
         /// Shows all physics shapes in the viewport.
         /// </summary>
@@ -162,6 +166,10 @@ namespace Robust.Client.Debugging
         ShapeInfo = 1 << 3,
         Joints = 1 << 4,
         AABBs = 1 << 5,
+
+        /// <summary>
+        /// Shows Center of Mass for all bodies in the viewport.
+        /// </summary>
         COM = 1 << 6,
     }
 
@@ -170,6 +178,7 @@ namespace Robust.Client.Debugging
         private IEntityManager _entityManager = default!;
         private IEyeManager _eyeManager = default!;
         private IInputManager _inputManager = default!;
+        private IMapManager _mapManager = default!;
         private DebugPhysicsSystem _debugPhysicsSystem = default!;
         private SharedPhysicsSystem _physicsSystem = default!;
 
@@ -181,11 +190,12 @@ namespace Robust.Client.Debugging
 
         private HashSet<Joint> _drawnJoints = new();
 
-        public PhysicsDebugOverlay(IEntityManager entityManager, IEyeManager eyeManager, IInputManager inputManager, IResourceCache cache, DebugPhysicsSystem system, SharedPhysicsSystem physicsSystem)
+        public PhysicsDebugOverlay(IEntityManager entityManager, IEyeManager eyeManager, IInputManager inputManager, IMapManager mapManager, IResourceCache cache, DebugPhysicsSystem system, SharedPhysicsSystem physicsSystem)
         {
             _entityManager = entityManager;
             _eyeManager = eyeManager;
             _inputManager = inputManager;
+            _mapManager = mapManager;
             _debugPhysicsSystem = system;
             _physicsSystem = physicsSystem;
             _font = new VectorFont(cache.GetResource<FontResource>("/Fonts/NotoSans/NotoSans-Regular.ttf"), 10);
@@ -240,26 +250,21 @@ namespace Robust.Client.Debugging
 
             if ((_debugPhysicsSystem.Flags & PhysicsDebugFlags.COM) != 0)
             {
+                const float Alpha = 0.25f;
+
                 foreach (var physBody in _physicsSystem.GetCollidingEntities(mapId, viewBounds))
                 {
-                    Color color;
-                    const float Alpha = 0.25f;
-                    float size;
-
-                    if (_entityManager.HasComponent<MapGridComponent>(physBody.Owner))
-                    {
-                        color = Color.Orange.WithAlpha(Alpha);
-                        size = 1f;
-                    }
-                    else
-                    {
-                        color = Color.Purple.WithAlpha(Alpha);
-                        size = 0.2f;
-                    }
-
+                    var color = Color.Purple.WithAlpha(Alpha);
                     var transform = physBody.GetTransform();
+                    worldHandle.DrawCircle(Transform.Mul(transform, physBody.LocalCenter), 0.2f, color);
+                }
 
-                    worldHandle.DrawCircle(Transform.Mul(transform, physBody.LocalCenter), size, color);
+                foreach (var grid in _mapManager.FindGridsIntersecting(mapId, viewBounds))
+                {
+                    var physBody = _entityManager.GetComponent<PhysicsComponent>(grid.GridEntityId);
+                    var color = Color.Orange.WithAlpha(Alpha);
+                    var transform = physBody.GetTransform();
+                    worldHandle.DrawCircle(Transform.Mul(transform, physBody.LocalCenter), 1f, color);
                 }
             }
 

Robust.Client/Debugging/IDebugDrawing.cs

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

Robust.Client/GameController/GameController.Redialler.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Threading;
+using Robust.LoaderApi;
+using Robust.Shared;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility;
+
+namespace Robust.Client;
+
+internal partial class GameController
+{
+    // A little paranoia goes a long way.
+    // This is static on purpose - the whole process shouldn't redial more than once, ever.
+    private static int _hasRedialled = 0;
+
+    public void Redial(string address, string? text = null)
+    {
+        // -- ATTENTION, YE WOULD-BE TRESPASSERS! --
+        // This code is the least testable code ever (because it's in-engine code that requires the Launcher), so don't make it do too much.
+        // This checks for some obvious requirements and then forwards to RedialApi which does the actual work.
+        // Testing of RedialApi is doable in the SS14.Launcher project, this is why it has a fake RobustToolbox build.
+        // -- THANK YE, NOW KINDLY MOVE ALONG! --
+
+        // We don't ever want to successfully redial more than once, and we want to shutdown once we've redialled.
+        // Otherwise abuse could happen.
+        DebugTools.AssertNotNull(_mainLoop);
+
+        Logger.Info($"Attempting redial of {address}: {text ?? "no reason given"}");
+
+        if (!_mainLoop!.Running)
+        {
+            throw new Exception("Attempted a redial during shutdown, this is not acceptable - redial first and if you succeed it'll shutdown anyway.");
+        }
+
+        if (_loaderArgs == null)
+        {
+            throw new Exception("Attempted a redial when the game was not run from the launcher (_loaderArgs == null)");
+        }
+
+        if (_loaderArgs!.RedialApi == null)
+        {
+            throw new Exception("Attempted a redial when redialling was not supported by the loader (Outdated launcher?)");
+        }
+
+        if (Interlocked.Increment(ref _hasRedialled) != 1)
+        {
+            // Don't let it overflow or anything
+            Interlocked.Decrement(ref _hasRedialled);
+            throw new Exception("Attempted a redial after one already succeeded or while one is in progress, this is never acceptable");
+        }
+
+        try
+        {
+            _loaderArgs!.RedialApi!.Redial(new Uri(address), text ?? "");
+        }
+        catch (Exception)
+        {
+            Interlocked.Decrement(ref _hasRedialled);
+            throw;
+        }
+
+        Shutdown("Redial");
+    }
+}
+

Robust.Client/GameController/GameController.cs

@@ -21,14 +21,16 @@ using Robust.Shared;
 using Robust.Shared.Asynchronous;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
-using Robust.Shared.GameObjects;
+using Robust.Shared.Exceptions;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Network;
+using Robust.Shared.Profiling;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Threading;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using YamlDotNet.RepresentationModel;
@@ -50,7 +52,6 @@ namespace Robust.Client
         [Dependency] private readonly IClientConsoleHost _console = default!;
         [Dependency] private readonly ITimerManager _timerManager = default!;
         [Dependency] private readonly IClientEntityManager _entityManager = default!;
-        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IPlacementManager _placementManager = default!;
         [Dependency] private readonly IClientGameStateManager _gameStateManager = default!;
         [Dependency] private readonly IOverlayManagerInternal _overlayManager = default!;
@@ -67,6 +68,9 @@ namespace Robust.Client
         [Dependency] private readonly IAuthManager _authManager = default!;
         [Dependency] private readonly IMidiManager _midiManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IParallelManagerInternal _parallelMgr = default!;
+        [Dependency] private readonly ProfManager _prof = default!;
+        [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
 
         private IWebViewManagerHook? _webViewHook;
 
@@ -92,7 +96,8 @@ namespace Robust.Client
 
             _clyde.InitializePostWindowing();
             _clydeAudio.InitializePostWindowing();
-            _clyde.SetWindowTitle(Options.DefaultWindowTitle ?? _resourceManifest!.DefaultWindowTitle ?? "RobustToolbox");
+            _clyde.SetWindowTitle(
+                Options.DefaultWindowTitle ?? _resourceManifest!.DefaultWindowTitle ?? "RobustToolbox");
 
             _taskManager.Initialize();
             _fontManager.SetFontDpi((uint)_configurationManager.GetCVar(CVars.DisplayFontDpi));
@@ -103,7 +108,8 @@ namespace Robust.Client
             // Disable load context usage on content start.
             // This prevents Content.Client being loaded twice and things like csi blowing up because of it.
             _modLoader.SetUseLoadContext(!ContentStart);
-            _modLoader.SetEnableSandboxing(Options.Sandboxing);
+            var disableSandbox = Environment.GetEnvironmentVariable("ROBUST_DISABLE_SANDBOX") == "1";
+            _modLoader.SetEnableSandboxing(!disableSandbox && Options.Sandboxing);
 
             var assemblyPrefix = Options.ContentModulePrefix ?? _resourceManifest!.AssemblyPrefix ?? "Content.";
             if (!_modLoader.TryLoadModulesFrom(Options.AssemblyDirectory, assemblyPrefix))
@@ -132,8 +138,9 @@ namespace Robust.Client
             _inputManager.Initialize();
             _console.Initialize();
             _prototypeManager.Initialize();
+            _prototypeManager.LoadDirectory(new ResourcePath("/EnginePrototypes/"));
             _prototypeManager.LoadDirectory(Options.PrototypeDirectory);
-            _prototypeManager.Resync();
+            _prototypeManager.ResolveResults();
             _entityManager.Initialize();
             _mapManager.Initialize();
             _gameStateManager.Initialize();
@@ -158,7 +165,7 @@ namespace Robust.Client
             // Setup main loop
             if (_mainLoop == null)
             {
-                _mainLoop = new GameLoop(_gameTiming)
+                _mainLoop = new GameLoop(_gameTiming, _runtimeLog, _prof)
                 {
                     SleepMode = displayMode == DisplayMode.Headless ? SleepMode.Delay : SleepMode.None
                 };
@@ -198,7 +205,7 @@ namespace Robust.Client
 
             _clyde.Ready();
 
-            if (!Options.DisableCommandLineConnect &&
+            if (_resourceManifest!.AutoConnect &&
                 (_commandLineArgs?.Connect == true || _commandLineArgs?.Launcher == true)
                 && LaunchState.ConnectEndpoint != null)
             {
@@ -214,7 +221,7 @@ namespace Robust.Client
         {
             // Parses /manifest.yml for game-specific settings that cannot be exclusively set up by content code.
             if (!_resourceCache.TryContentFileRead("/manifest.yml", out var stream))
-                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null);
+                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null, true);
 
             var yamlStream = new YamlStream();
             using (stream)
@@ -224,7 +231,7 @@ namespace Robust.Client
             }
 
             if (yamlStream.Documents.Count == 0)
-                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null);
+                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null, true);
 
             if (yamlStream.Documents.Count != 1 || yamlStream.Documents[0].RootNode is not YamlMappingNode mapping)
             {
@@ -259,7 +266,11 @@ namespace Robust.Client
             if (mapping.TryGetNode("splashLogo", out var splashNode))
                 splashLogo = splashNode.AsString();
 
-            return new ResourceManifestData(modules, assemblyPrefix, defaultWindowTitle, windowIconSet, splashLogo);
+            bool autoConnect = true;
+            if (mapping.TryGetNode("autoConnect", out var autoConnectNode))
+                autoConnect = autoConnectNode.AsBool();
+
+            return new ResourceManifestData(modules, assemblyPrefix, defaultWindowTitle, windowIconSet, splashLogo, autoConnect);
         }
 
         internal bool StartupSystemSplash(GameControllerOptions options, Func<ILogHandler>? logHandlerFactory)
@@ -327,6 +338,12 @@ namespace Robust.Client
 
             ProfileOptSetup.Setup(_configurationManager);
 
+            _parallelMgr.Initialize();
+            _prof.Initialize();
+#if !FULL_RELEASE
+            _configurationManager.OverrideDefault(CVars.ProfEnabled, true);
+#endif
+
             _resourceCache.Initialize(Options.LoadConfigAndUserData ? userDataDir : null);
 
             var mountOptions = _commandLineArgs != null
@@ -447,52 +464,127 @@ namespace Robust.Client
 
         private void Input(FrameEventArgs frameEventArgs)
         {
-            _clyde.ProcessInput(frameEventArgs);
-            _networkManager.ProcessPackets();
-            _taskManager.ProcessPendingTasks(); // tasks like connect
+            using (_prof.Group("Input Events"))
+            {
+                _clyde.ProcessInput(frameEventArgs);
+            }
+
+            using (_prof.Group("Network"))
+            {
+                _networkManager.ProcessPackets();
+            }
+
+            using (_prof.Group("Async"))
+            {
+                _taskManager.ProcessPendingTasks(); // tasks like connect
+            }
         }
 
         private void Tick(FrameEventArgs frameEventArgs)
         {
-            _modLoader.BroadcastUpdate(ModUpdateLevel.PreEngine, frameEventArgs);
-            _timerManager.UpdateTimers(frameEventArgs);
-            _taskManager.ProcessPendingTasks();
+            using (_prof.Group("Content pre engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.PreEngine, frameEventArgs);
+            }
+
+            using (_prof.Group("Console"))
+            {
+                _console.CommandBufferExecute();
+            }
+
+            using (_prof.Group("Timers"))
+            {
+                _timerManager.UpdateTimers(frameEventArgs);
+            }
+
+            using (_prof.Group("Async"))
+            {
+                _taskManager.ProcessPendingTasks();
+            }
 
             // GameStateManager is in full control of the simulation update in multiplayer.
             if (_client.RunLevel == ClientRunLevel.InGame || _client.RunLevel == ClientRunLevel.Connected)
             {
-                _gameStateManager.ApplyGameState();
+                using (_prof.Group("Game state"))
+                {
+                    _gameStateManager.ApplyGameState();
+                }
             }
 
             // In singleplayer, however, we're in full control instead.
             else if (_client.RunLevel == ClientRunLevel.SinglePlayerGame)
             {
-                // The last real tick is the current tick! This way we won't be in "prediction" mode.
-                _gameTiming.LastRealTick = _gameTiming.CurTick;
-                _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false);
-                _lookup.Update();
+                using (_prof.Group("Entity"))
+                {
+                    // The last real tick is the current tick! This way we won't be in "prediction" mode.
+                    _gameTiming.LastRealTick = _gameTiming.CurTick;
+                    _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false);
+                }
             }
 
-            _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);
+            using (_prof.Group("Content post engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);
+            }
         }
 
         private void Update(FrameEventArgs frameEventArgs)
         {
-            _webViewHook?.Update();
-            _clydeAudio.FrameProcess(frameEventArgs);
-            _clyde.FrameProcess(frameEventArgs);
-            _modLoader.BroadcastUpdate(ModUpdateLevel.FramePreEngine, frameEventArgs);
-            _stateManager.FrameUpdate(frameEventArgs);
+            if (_webViewHook != null)
+            {
+                using (_prof.Group("WebView"))
+                {
+                    _webViewHook?.Update();
+                }
+            }
+
+            using (_prof.Group("ClydeAudio"))
+            {
+                _clydeAudio.FrameProcess(frameEventArgs);
+            }
+
+            using (_prof.Group("Clyde"))
+            {
+                _clyde.FrameProcess(frameEventArgs);
+            }
+
+            using (_prof.Group("Content Pre Engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.FramePreEngine, frameEventArgs);
+            }
+
+            using (_prof.Group("State"))
+            {
+                _stateManager.FrameUpdate(frameEventArgs);
+            }
 
             if (_client.RunLevel >= ClientRunLevel.Connected)
             {
-                _placementManager.FrameUpdate(frameEventArgs);
-                _entityManager.FrameUpdate(frameEventArgs.DeltaSeconds);
+                using (_prof.Group("Placement"))
+                {
+                    _placementManager.FrameUpdate(frameEventArgs);
+                }
+
+                using (_prof.Group("Entity"))
+                {
+                    _entityManager.FrameUpdate(frameEventArgs.DeltaSeconds);
+                }
             }
 
-            _overlayManager.FrameUpdate(frameEventArgs);
-            _userInterfaceManager.FrameUpdate(frameEventArgs);
-            _modLoader.BroadcastUpdate(ModUpdateLevel.FramePostEngine, frameEventArgs);
+            using (_prof.Group("Overlay"))
+            {
+                _overlayManager.FrameUpdate(frameEventArgs);
+            }
+
+            using (_prof.Group("UI"))
+            {
+                _userInterfaceManager.FrameUpdate(frameEventArgs);
+            }
+
+            using (_prof.Group("Content Post Engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.FramePostEngine, frameEventArgs);
+            }
         }
 
         internal static void SetupLogging(ILogManager logManager, Func<ILogHandler> logHandlerFactory)
@@ -510,7 +602,7 @@ namespace Robust.Client
             logManager.GetSawmill("discord").Level = LogLevel.Warning;
             logManager.GetSawmill("net.predict").Level = LogLevel.Info;
             logManager.GetSawmill("szr").Level = LogLevel.Info;
-            logManager.GetSawmill("loc").Level = LogLevel.Error;
+            logManager.GetSawmill("loc").Level = LogLevel.Warning;
 
 #if DEBUG_ONLY_FCE_INFO
 #if DEBUG_ONLY_FCE_LOG
@@ -575,7 +667,6 @@ namespace Robust.Client
 
             _networkManager.Shutdown("Client shutting down");
             _midiManager.Shutdown();
-            IoCManager.Resolve<IEntityLookup>().Shutdown();
             _entityManager.Shutdown();
             _clyde.Shutdown();
             _clydeAudio.Shutdown();
@@ -586,7 +677,8 @@ namespace Robust.Client
             string? AssemblyPrefix,
             string? DefaultWindowTitle,
             string? WindowIconSet,
-            string? SplashLogo
+            string? SplashLogo,
+            bool AutoConnect
         );
     }
 }

Robust.Client/GameControllerOptions.cs

@@ -82,10 +82,5 @@ namespace Robust.Client
         ///     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>
-        public bool DisableCommandLineConnect { get; init; } = false;
     }
 }

Robust.Client/GameObjects/ClientEntityManager.cs

@@ -27,7 +27,6 @@ namespace Robust.Client.GameObjects
         public override void Initialize()
         {
             SetupNetworking();
-            ReceivedComponentMessage += (_, compMsg) => DispatchComponentMessage(compMsg);
             ReceivedSystemMessage += (_, systemMsg) => EventBus.RaiseEvent(EventSource.Network, systemMsg);
 
             base.Initialize();
@@ -38,9 +37,9 @@ namespace Robust.Client.GameObjects
             return base.CreateEntity(prototypeName, uid);
         }
 
-        void IClientEntityManagerInternal.InitializeEntity(EntityUid entity)
+        void IClientEntityManagerInternal.InitializeEntity(EntityUid entity, MetaDataComponent? meta)
         {
-            base.InitializeEntity(entity);
+            base.InitializeEntity(entity, meta);
         }
 
         void IClientEntityManagerInternal.StartEntity(EntityUid entity)
@@ -52,9 +51,6 @@ namespace Robust.Client.GameObjects
 
         public override IEntityNetworkManager EntityNetManager => this;
 
-        /// <inheritdoc />
-        public event EventHandler<NetworkComponentMessage>? ReceivedComponentMessage;
-
         /// <inheritdoc />
         public event EventHandler<object>? ReceivedSystemMessage;
 
@@ -90,7 +86,7 @@ namespace Robust.Client.GameObjects
 
         public void SendSystemNetworkMessage(EntityEventArgs message, uint sequence)
         {
-            var msg = _networkManager.CreateNetMessage<MsgEntity>();
+            var msg = new MsgEntity();
             msg.Type = EntityMessageType.SystemMessage;
             msg.SystemMessage = message;
             msg.SourceTick = _gameTiming.CurTick;
@@ -105,26 +101,6 @@ namespace Robust.Client.GameObjects
             throw new NotSupportedException();
         }
 
-        /// <inheritdoc />
-        [Obsolete("Component Messages are deprecated, use Entity Events instead.")]
-        public void SendComponentNetworkMessage(INetChannel? channel, EntityUid entity, IComponent component, ComponentMessage message)
-        {
-            var componentType = component.GetType();
-            var netId = ComponentFactory.GetRegistration(componentType).NetID;
-
-            if (!netId.HasValue)
-                throw new ArgumentException($"Component {componentType} does not have a NetID.", nameof(component));
-
-            var msg = _networkManager.CreateNetMessage<MsgEntity>();
-            msg.Type = EntityMessageType.ComponentMessage;
-            msg.EntityUid = entity;
-            msg.NetId = netId.Value;
-            msg.ComponentMessage = message;
-            msg.SourceTick = _gameTiming.CurTick;
-
-            _networkManager.ClientSendMessage(msg);
-        }
-
         private void HandleEntityNetworkMessage(MsgEntity message)
         {
             if (message.SourceTick <= _gameStateManager.CurServerTick)
@@ -143,10 +119,6 @@ namespace Robust.Client.GameObjects
         {
             switch (message.Type)
             {
-                case EntityMessageType.ComponentMessage:
-                    ReceivedComponentMessage?.Invoke(this, new NetworkComponentMessage(message));
-                    return;
-
                 case EntityMessageType.SystemMessage:
                     var msg = message.SystemMessage;
                     var sessionType = typeof(EntitySessionMessage<>).MakeGenericType(msg.GetType());

Robust.Client/GameObjects/Components/Icon/IconComponent.cs

@@ -1,3 +1,4 @@
+using System;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Client.Utility;
@@ -32,11 +33,13 @@ namespace Robust.Client.GameObjects
         public const string LogCategory = "go.comp.icon";
         const string SerializationCache = "icon";
 
+        [Obsolete("Use SpriteSystem instead.")]
         private static IRsiStateLike TextureForConfig(IconComponent compData, IResourceCache resourceCache)
         {
             return compData.Icon?.Default ?? resourceCache.GetFallback<TextureResource>().Texture;
         }
 
+        [Obsolete("Use SpriteSystem instead.")]
         public static IRsiStateLike? GetPrototypeIcon(EntityPrototype prototype, IResourceCache resourceCache)
         {
             if (!prototype.Components.TryGetValue("Icon", out var compData))

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

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

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

@@ -11,7 +11,7 @@ namespace Robust.Client.GameObjects
 {
     [RegisterComponent]
     [ComponentReference(typeof(SharedPointLightComponent))]
-    public sealed class PointLightComponent : SharedPointLightComponent, ISerializationHooks
+    public sealed class PointLightComponent : SharedPointLightComponent
     {
         [Dependency] private readonly IEntityManager _entityManager = default!;
 

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

@@ -25,6 +25,8 @@ namespace Robust.Client.GameObjects
         [Animatable]
         Vector2 Scale { get; set; }
 
+        Box2 Bounds { get; }
+
         /// <summary>
         ///     A rotation applied to all layers.
         /// </summary>
@@ -119,7 +121,8 @@ namespace Robust.Client.GameObjects
         ///     This is useful to allow layer map configs to be defined in prototypes,
         ///     while still allowing code to create configs if they're absent.
         /// </remarks>
-        void LayerMapReserveBlank(object key);
+        /// <returns>Index of the new layer.</returns>
+        int LayerMapReserveBlank(object key);
 
         /// <summary>
         ///     Adds a layer without texture (thus falling back to the error texture).
@@ -145,8 +148,8 @@ namespace Robust.Client.GameObjects
         void RemoveLayer(int layer);
         void RemoveLayer(object layerKey);
 
-        void LayerSetShader(int layer, ShaderInstance shader);
-        void LayerSetShader(object layerKey, ShaderInstance shader);
+        void LayerSetShader(int layer, ShaderInstance shader, string? prototype = null);
+        void LayerSetShader(object layerKey, ShaderInstance shader, string? prototype = null);
         void LayerSetShader(int layer, string shaderName);
         void LayerSetShader(object layerKey, string shaderName);
 
@@ -217,8 +220,8 @@ namespace Robust.Client.GameObjects
         int GetLayerDirectionCount(ISpriteLayer layer);
 
         /// <summary>
-        ///     Calculate sprite bounding box in world-space coordinates.
+        ///     Calculate the rotated sprite bounding box in world-space coordinates.
         /// </summary>
-        Box2 CalculateBoundingBox(Vector2 worldPos);
+        Box2Rotated CalculateRotatedBoundingBox(Vector2 worldPosition, Angle worldRotation, IEye? eye = null);
     }
 }

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

@@ -25,8 +25,6 @@ namespace Robust.Client.GameObjects
 
         RSI.State.Direction EffectiveDirection(Angle worldRotation);
 
-        Vector2 LocalToLayer(Vector2 localPos);
-
         /// <summary>
         ///     Layer size in pixels.
         ///     Don't account layer scale or sprite world transform.

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

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

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

@@ -75,6 +75,10 @@ namespace Robust.Client.GameObjects
                 (BoundUserInterface) _dynamicTypeFactory.CreateInstance(type, new[] {this, wrapped.UiKey});
             boundInterface.Open();
             _openInterfaces[wrapped.UiKey] = boundInterface;
+
+            var playerSession = _playerManager.LocalPlayer?.Session;
+            if(playerSession != null)
+                _entityManager.EventBus.RaiseLocalEvent(Owner, new BoundUIOpenedEvent(wrapped.UiKey, Owner, playerSession));
         }
 
         internal void Close(object uiKey, bool remoteCall)

Robust.Client/GameObjects/EntitySystems/AppearanceSystem.cs

@@ -1,12 +1,14 @@
+using System;
 using System.Collections.Generic;
 using JetBrains.Annotations;
+using Robust.Shared;
 using Robust.Shared.GameObjects;
 using Robust.Shared.GameStates;
 
 namespace Robust.Client.GameObjects
 {
     [UsedImplicitly]
-    internal sealed class AppearanceSystem : SharedAppearanceSystem
+    public sealed class AppearanceSystem : SharedAppearanceSystem
     {
         private readonly Queue<ClientAppearanceComponent> _queuedUpdates = new();
 
@@ -50,10 +52,33 @@ namespace Robust.Client.GameObjects
 
             if (!stateDiff) return;
 
-            component.AppearanceData = actualState.Data;
+            component.AppearanceData = CloneAppearanceData(actualState.Data);
             MarkDirty(component);
         }
 
+        /// <summary>
+        ///     Take in an appearance data dictionary and attempt to clone it.
+        /// </summary>
+        /// <remarks>
+        ///     As some appearance data values are not simple value-type objects, this is not just a shallow clone.
+        /// </remarks>
+        private Dictionary<object, object> CloneAppearanceData(Dictionary<object, object> data)
+        {
+            Dictionary<object, object> newDict = new(data.Count);
+
+            foreach (var (key, value) in data)
+            {
+                if (value.GetType().IsValueType)
+                    newDict[key] = value;
+                else if (value is ICloneable cloneable)
+                    newDict[key] = cloneable.Clone();
+                else
+                    throw new NotSupportedException("Invalid object in appearance data dictionary. Appearance data must be cloneable");
+            }
+
+            return newDict;
+        }
+
         public override void MarkDirty(AppearanceComponent component)
         {
             if (component.AppearanceDirty)
@@ -70,17 +95,21 @@ namespace Robust.Client.GameObjects
 
         public override void FrameUpdate(float frameTime)
         {
+            var spriteQuery = GetEntityQuery<SpriteComponent>();
             while (_queuedUpdates.TryDequeue(out var appearance))
             {
                 if (appearance.Deleted)
                     continue;
 
-                OnChangeData(appearance.Owner, appearance);
+                // Sprite comp is allowed to be null, so that things like spriteless point-lights can use this system
+                spriteQuery.TryGetComponent(appearance.Owner, out var sprite);
+
+                OnChangeData(appearance.Owner, sprite, appearance);
                 UnmarkDirty(appearance);
             }
         }
 
-        public void OnChangeData(EntityUid uid, ClientAppearanceComponent? appearanceComponent = null)
+        public void OnChangeData(EntityUid uid, SpriteComponent? sprite, ClientAppearanceComponent? appearanceComponent = null)
         {
             if (!Resolve(uid, ref appearanceComponent, false)) return;
 
@@ -88,6 +117,7 @@ namespace Robust.Client.GameObjects
             {
                 Component = appearanceComponent,
                 AppearanceData = appearanceComponent.AppearanceData,
+                Sprite = sprite,
             };
 
             // Give it AppearanceData so we can still keep the friend attribute on the component.
@@ -107,7 +137,8 @@ namespace Robust.Client.GameObjects
     [ByRefEvent]
     public struct AppearanceChangeEvent
     {
-        public AppearanceComponent Component = default!;
-        public IReadOnlyDictionary<object, object> AppearanceData = default!;
+        public AppearanceComponent Component;
+        public IReadOnlyDictionary<object, object> AppearanceData;
+        public SpriteComponent? Sprite;
     }
 }

Robust.Client/GameObjects/EntitySystems/AudioSystem.cs

@@ -144,75 +144,94 @@ namespace Robust.Client.GameObjects
                         {
                             stream.Source.SetVolume(-10000000);
                         }
-                        else
+                        else if (stream.Attenuation == Attenuation.NoAttenuation)
                         {
-                            var sourceRelative = ourPos - pos.Position;
-                            var occlusion = 0f;
-                            if (sourceRelative.Length > 0)
-                            {
-                                occlusion = _broadPhaseSystem.IntersectRayPenetration(
-                                    pos.MapId,
-                                    new CollisionRay(
-                                        pos.Position,
-                                        sourceRelative.Normalized,
-                                        OcclusionCollisionMask),
-                                    sourceRelative.Length,
-                                    stream.TrackingEntity);
-                            }
-
-                            var distance = MathF.Max(stream.ReferenceDistance, MathF.Min(sourceRelative.Length, stream.MaxDistance));
-                            float gain;
-
-                            // Technically these are formulas for gain not decibels but EHHHHHHHH.
-                            switch (stream.Attenuation)
-                            {
-                                case Attenuation.Default:
-                                    gain = 1f;
-                                    break;
-                                // You thought I'd implement clamping per source? Hell no that's just for the overall OpenAL setting
-                                // I didn't even wanna implement this much for linear but figured it'd be cleaner.
-                                case Attenuation.InverseDistanceClamped:
-                                case Attenuation.InverseDistance:
-                                    gain = stream.ReferenceDistance /
-                                           (stream.ReferenceDistance + stream.RolloffFactor * (distance - stream.ReferenceDistance));
-
-                                    break;
-                                case Attenuation.LinearDistanceClamped:
-                                case Attenuation.LinearDistance:
-                                    gain = 1f - stream.RolloffFactor * (distance - stream.ReferenceDistance) /
-                                        (stream.MaxDistance - stream.ReferenceDistance);
-
-                                    break;
-                                case Attenuation.ExponentDistanceClamped:
-                                case Attenuation.ExponentDistance:
-                                    gain = MathF.Pow((distance / stream.ReferenceDistance),
-                                        (-stream.RolloffFactor));
-                                    break;
-                                default:
-                                    throw new ArgumentOutOfRangeException($"No implemented attenuation for {stream.Attenuation.ToString()}");
-                            }
-
-                            var volume = MathF.Pow(10, stream.Volume / 10);
-                            var actualGain = MathF.Max(0f, volume * gain);
-
-                            stream.Source.SetVolumeDirect(actualGain);
-                            stream.Source.SetOcclusion(occlusion);
-                        }
-
-                        SetAudioPos(stream, stream.Attenuation != Attenuation.NoAttenuation ? pos.Position : ourPos);
-
-                        void SetAudioPos(PlayingStream stream, Vector2 pos)
-                        {
-                            if (!stream.Source.SetPosition(pos))
+                            //TODO: OpenAL supports positional audio together with no attenuation, we should do too.
+                            if (!stream.Source.SetPosition(ourPos))
                             {
                                 Logger.Warning("Interrupting positional audio, can't set position.");
                                 stream.Source.StopPlaying();
                             }
                         }
-
-                        if (stream.TrackingEntity != default)
+                        else
                         {
-                            stream.Source.SetVelocity(stream.TrackingEntity.GlobalLinearVelocity());
+                            var sourceRelative = ourPos - pos.Position;
+                            // OpenAL uses MaxDistance to limit how much attenuation can *reduce* the gain,
+                            // and doesn't do any culling. We however cull based on MaxDistance, because
+                            // this is what all current code that uses MaxDistance expects and because
+                            // we don't need the OpenAL behaviour.
+                            if (sourceRelative.Length > stream.MaxDistance)
+                            {
+                                stream.Source.SetVolume(-10000000);
+                            }
+                            else
+                            {
+                                var occlusion = 0f;
+                                if (sourceRelative.Length > 0)
+                                {
+                                    occlusion = _broadPhaseSystem.IntersectRayPenetration(
+                                        pos.MapId,
+                                        new CollisionRay(
+                                            pos.Position,
+                                            sourceRelative.Normalized,
+                                            OcclusionCollisionMask),
+                                        sourceRelative.Length,
+                                        stream.TrackingEntity);
+                                }
+
+                                // OpenAL also limits the distance to <= AL_MAX_DISTANCE, but since we cull
+                                // sources that are further away than stream.MaxDistance, we don't do that.
+                                var distance = MathF.Max(stream.ReferenceDistance, sourceRelative.Length);
+                                float gain;
+
+                                // Technically these are formulas for gain not decibels but EHHHHHHHH.
+                                switch (stream.Attenuation)
+                                {
+                                    case Attenuation.Default:
+                                        gain = 1f;
+                                        break;
+                                    // You thought I'd implement clamping per source? Hell no that's just for the overall OpenAL setting
+                                    // I didn't even wanna implement this much for linear but figured it'd be cleaner.
+                                    case Attenuation.InverseDistanceClamped:
+                                    case Attenuation.InverseDistance:
+                                        gain = stream.ReferenceDistance /
+                                               (stream.ReferenceDistance + stream.RolloffFactor *
+                                                   (distance - stream.ReferenceDistance));
+
+                                        break;
+                                    case Attenuation.LinearDistanceClamped:
+                                    case Attenuation.LinearDistance:
+                                        gain = 1f - stream.RolloffFactor * (distance - stream.ReferenceDistance) /
+                                            (stream.MaxDistance - stream.ReferenceDistance);
+
+                                        break;
+                                    case Attenuation.ExponentDistanceClamped:
+                                    case Attenuation.ExponentDistance:
+                                        gain = MathF.Pow((distance / stream.ReferenceDistance),
+                                            (-stream.RolloffFactor));
+                                        break;
+                                    default:
+                                        throw new ArgumentOutOfRangeException(
+                                            $"No implemented attenuation for {stream.Attenuation.ToString()}");
+                                }
+
+                                var volume = MathF.Pow(10, stream.Volume / 10);
+                                var actualGain = MathF.Max(0f, volume * gain);
+
+                                stream.Source.SetVolumeDirect(actualGain);
+                                stream.Source.SetOcclusion(occlusion);
+
+                                if (!stream.Source.SetPosition(pos.Position))
+                                {
+                                    Logger.Warning("Interrupting positional audio, can't set position.");
+                                    stream.Source.StopPlaying();
+                                }
+
+                                if (stream.TrackingEntity != default)
+                                {
+                                    stream.Source.SetVelocity(stream.TrackingEntity.GlobalLinearVelocity());
+                                }
+                            }
                         }
                     }
                 }
@@ -266,6 +285,7 @@ namespace Robust.Client.GameObjects
 
             source.SetGlobal();
             source.StartPlaying();
+            // These defaults differ from AudioParams.Default
             var playing = new PlayingStream
             {
                 Source = source,

Robust.Client/GameObjects/EntitySystems/ClientOccluderSystem.cs

@@ -1,12 +1,10 @@
 using System.Collections.Generic;
-using System.Linq;
 using JetBrains.Annotations;
 using Robust.Client.Physics;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
-using Robust.Shared.Utility;
 
 namespace Robust.Client.GameObjects
 {
@@ -33,9 +31,10 @@ namespace Robust.Client.GameObjects
             UpdatesAfter.Add(typeof(TransformSystem));
             UpdatesAfter.Add(typeof(PhysicsSystem));
 
-            SubscribeLocalEvent<OccluderDirtyEvent>(HandleDirtyEvent);
+            SubscribeLocalEvent<OccluderDirtyEvent>(OnOccluderDirty);
 
-            SubscribeLocalEvent<ClientOccluderComponent, AnchorStateChangedEvent>(HandleAnchorChanged);
+            SubscribeLocalEvent<ClientOccluderComponent, AnchorStateChangedEvent>(OnAnchorChanged);
+            SubscribeLocalEvent<ClientOccluderComponent, ReAnchorEvent>(OnReAnchor);
         }
 
         public override void FrameUpdate(float frameTime)
@@ -62,51 +61,58 @@ namespace Robust.Client.GameObjects
             }
         }
 
-        private static void HandleAnchorChanged(EntityUid uid, ClientOccluderComponent component, ref AnchorStateChangedEvent args)
+        private static void OnAnchorChanged(EntityUid uid, ClientOccluderComponent component, ref AnchorStateChangedEvent args)
         {
             component.AnchorStateChanged();
         }
 
-        private void HandleDirtyEvent(OccluderDirtyEvent ev)
+        private void OnReAnchor(EntityUid uid, ClientOccluderComponent component, ref ReAnchorEvent args)
+        {
+            component.AnchorStateChanged();
+        }
+
+        private void OnOccluderDirty(OccluderDirtyEvent ev)
         {
             var sender = ev.Sender;
+            IMapGrid? grid;
+            var occluderQuery = GetEntityQuery<ClientOccluderComponent>();
+
             if (EntityManager.EntityExists(sender) &&
-                EntityManager.TryGetComponent(sender, out ClientOccluderComponent? iconSmooth)
-                && iconSmooth.Initialized)
+                occluderQuery.HasComponent(sender))
             {
                 var xform = EntityManager.GetComponent<TransformComponent>(sender);
-                if (!_mapManager.TryGetGrid(xform.GridID, out var grid1))
+                if (!_mapManager.TryGetGrid(xform.GridID, out grid))
                     return;
 
                 var coords = xform.Coordinates;
+                var localGrid = grid.TileIndicesFor(coords);
 
                 _dirtyEntities.Enqueue(sender);
-                AddValidEntities(grid1.GetInDir(coords, Direction.North));
-                AddValidEntities(grid1.GetInDir(coords, Direction.South));
-                AddValidEntities(grid1.GetInDir(coords, Direction.East));
-                AddValidEntities(grid1.GetInDir(coords, Direction.West));
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(localGrid + new Vector2i(0, 1)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(localGrid + new Vector2i(0, -1)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(localGrid + new Vector2i(1, 0)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(localGrid + new Vector2i(-1, 0)), occluderQuery);
             }
 
             // Entity is no longer valid, update around the last position it was at.
-            else if (ev.LastPosition.HasValue && _mapManager.TryGetGrid(ev.LastPosition.Value.grid, out var grid))
+            else if (ev.LastPosition.HasValue && _mapManager.TryGetGrid(ev.LastPosition.Value.grid, out grid))
             {
                 var pos = ev.LastPosition.Value.pos;
 
-                AddValidEntities(grid.GetAnchoredEntities(pos + new Vector2i(1, 0)));
-                AddValidEntities(grid.GetAnchoredEntities(pos + new Vector2i(-1, 0)));
-                AddValidEntities(grid.GetAnchoredEntities(pos + new Vector2i(0, 1)));
-                AddValidEntities(grid.GetAnchoredEntities(pos + new Vector2i(0, -1)));
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(pos + new Vector2i(0, 1)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(pos + new Vector2i(0, -1)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(pos + new Vector2i(1, 0)), occluderQuery);
+                AddValidEntities(grid.GetAnchoredEntitiesEnumerator(pos + new Vector2i(-1, 0)), occluderQuery);
             }
         }
 
-        private void AddValidEntities(IEnumerable<EntityUid> candidates)
+        private void AddValidEntities(AnchoredEntitiesEnumerator enumerator, EntityQuery<ClientOccluderComponent> occluderQuery)
         {
-            foreach (var entity in candidates)
+            while (enumerator.MoveNext(out var entity))
             {
-                if (EntityManager.HasComponent<ClientOccluderComponent>(entity))
-                {
-                    _dirtyEntities.Enqueue(entity);
-                }
+                if (!occluderQuery.HasComponent(entity.Value)) continue;
+
+                _dirtyEntities.Enqueue(entity.Value);
             }
         }
     }

Robust.Client/GameObjects/EntitySystems/ContainerSystem.cs

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

Robust.Client/GameObjects/EntitySystems/DebugEntityLookupSystem.cs

@@ -0,0 +1,105 @@
+using System.Collections.Generic;
+using Robust.Client.Graphics;
+using Robust.Shared.Console;
+using Robust.Shared.Containers;
+using Robust.Shared.Enums;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Utility;
+using Color = Robust.Shared.Maths.Color;
+
+namespace Robust.Client.GameObjects;
+
+public sealed class DebugEntityLookupCommand : IConsoleCommand
+{
+    public string Command => "togglelookup";
+    public string Description => "Shows / hides entitylookup bounds via an overlay";
+    public string Help => $"{Command}";
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        EntitySystem.Get<DebugEntityLookupSystem>().Enabled ^= true;
+    }
+}
+
+public sealed class DebugEntityLookupSystem : EntitySystem
+{
+    public bool Enabled
+    {
+        get => _enabled;
+        set
+        {
+            if (_enabled == value) return;
+
+            _enabled = value;
+
+            if (_enabled)
+            {
+                IoCManager.Resolve<IOverlayManager>().AddOverlay(
+                    new EntityLookupOverlay(
+                        EntityManager,
+                        Get<EntityLookupSystem>()));
+            }
+            else
+            {
+                IoCManager.Resolve<IOverlayManager>().RemoveOverlay<EntityLookupOverlay>();
+            }
+        }
+    }
+
+    private bool _enabled;
+}
+
+public sealed class EntityLookupOverlay : Overlay
+{
+    private IEntityManager _entityManager = default!;
+    private EntityLookupSystem _lookup = default!;
+
+    public override OverlaySpace Space => OverlaySpace.WorldSpace;
+
+    public EntityLookupOverlay(IEntityManager entManager, EntityLookupSystem lookup)
+    {
+        _entityManager = entManager;
+        _lookup = lookup;
+    }
+
+    protected internal override void Draw(in OverlayDrawArgs args)
+    {
+        var worldHandle = args.WorldHandle;
+        var xformQuery = _entityManager.GetEntityQuery<TransformComponent>();
+
+        foreach (var lookup in _lookup.FindLookupsIntersecting(args.MapId, args.WorldBounds))
+        {
+            var lookupXform = xformQuery.GetComponent(lookup.Owner);
+
+            var (_, rotation, matrix, invMatrix) = lookupXform.GetWorldPositionRotationMatrixWithInv();
+
+            worldHandle.SetTransform(matrix);
+
+
+            var lookupAABB = invMatrix.TransformBox(args.WorldBounds);
+            var ents = new List<EntityUid>();
+
+            // Gonna allocate a lot but debug overlay sooo
+            lookup.Tree._b2Tree.FastQuery(ref lookupAABB, (ref EntityUid data) =>
+            {
+                ents.Add(data);
+            });
+
+            foreach (var ent in ents)
+            {
+                if (_entityManager.Deleted(ent)) continue;
+                var xform = xformQuery.GetComponent(ent);
+
+                //DebugTools.Assert(!ent.IsInContainer(_entityManager));
+                var (entPos, entRot) = xform.GetWorldPositionRotation();
+
+                var lookupPos = invMatrix.Transform(entPos);
+                var lookupRot = entRot - rotation;
+
+                var aabb = _lookup.GetAABB(ent, lookupPos, lookupRot, xform, xformQuery);
+
+                worldHandle.DrawRect(aabb, Color.Blue.WithAlpha(0.2f));
+            }
+        }
+    }
+}

Robust.Client/GameObjects/EntitySystems/DebugLightTreeSystem.cs

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

Robust.Client/GameObjects/EntitySystems/EffectSystem.cs

@@ -323,7 +323,7 @@ namespace Robust.Client.GameObjects
         {
             private readonly IPlayerManager _playerManager;
 
-            public override OverlaySpace Space => OverlaySpace.WorldSpace;
+            public override OverlaySpace Space => OverlaySpace.WorldSpaceBelowFOV;
 
             private readonly ShaderInstance _unshadedShader;
             private readonly EffectSystem _owner;
@@ -342,7 +342,6 @@ namespace Robust.Client.GameObjects
                 var map = _owner.eyeManager.CurrentMap;
 
                 var worldHandle = args.WorldHandle;
-                ShaderInstance? currentShader = null;
 
                 if (_playerManager.LocalPlayer?.ControlledEntity is not {} playerEnt)
                     return;
@@ -362,13 +361,8 @@ namespace Robust.Client.GameObjects
                         continue;
                     }
 
-                    var newShader = effect.Shaded ? null : _unshadedShader;
-
-                    if (newShader != currentShader)
-                    {
-                        worldHandle.UseShader(newShader);
-                        currentShader = newShader;
-                    }
+                    if (!effect.Shaded)
+                        worldHandle.UseShader(_unshadedShader);
 
                     // TODO: Should be doing matrix transformations
                     var effectSprite = effect.EffectSprite;
@@ -377,6 +371,9 @@ namespace Robust.Client.GameObjects
                         (attachedXform?.Coordinates ?? effect.Coordinates)
                         .Offset(effect.AttachedOffset);
 
+                    // If we've never seen the entity before then can't resolve coordinates.
+                    if (!coordinates.IsValid(_entityManager)) continue;
+
                     // ???
                     var rotation = attachedXform?.WorldRotation ?? _entityManager.GetComponent<TransformComponent>(coordinates.EntityId).WorldRotation;
 
@@ -386,6 +383,9 @@ namespace Robust.Client.GameObjects
                     var rotatedBox = new Box2Rotated(effectArea, effect.Rotation + rotation, effectOrigin);
 
                     worldHandle.DrawTextureRect(effectSprite, rotatedBox, ToColor(effect.Color));
+
+                    if (!effect.Shaded)
+                        worldHandle.UseShader(null);
                 }
             }
         }

Robust.Client/GameObjects/EntitySystems/GridChunkBoundsDebugSystem.cs

@@ -76,7 +76,7 @@ namespace Robust.Client.GameObjects
                 worldHandle.SetTransform(worldMatrix);
                 var transform = new Transform(Vector2.Zero, Angle.Zero);
 
-                gridInternal.GetMapChunks(viewport, out var chunkEnumerator);
+                var chunkEnumerator = gridInternal.GetMapChunks(viewport);
 
                 while (chunkEnumerator.MoveNext(out var chunk))
                 {

Robust.Client/GameObjects/EntitySystems/GridFixtureSystem.cs

@@ -1,9 +0,0 @@
-using Robust.Shared.GameObjects;
-
-namespace Robust.Client.GameObjects
-{
-    internal sealed class GridFixtureSystem : SharedGridFixtureSystem
-    {
-
-    }
-}

Robust.Client/GameObjects/EntitySystems/GridRenderingSystem.cs

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

Robust.Client/GameObjects/EntitySystems/InputSystem.cs

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

Robust.Client/GameObjects/EntitySystems/RenderingTreeSystem.cs

@@ -70,18 +70,17 @@ namespace Robust.Client.GameObjects
             UpdatesAfter.Add(typeof(TransformSystem));
             UpdatesAfter.Add(typeof(PhysicsSystem));
 
-            _mapManager.MapCreated += MapManagerOnMapCreated;
-            _mapManager.OnGridCreated += MapManagerOnGridCreated;
+            SubscribeLocalEvent<MapChangedEvent>(MapManagerOnMapCreated);
+
+            SubscribeLocalEvent<GridInitializeEvent>(MapManagerOnGridCreated);
 
             // 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, PointLightUpdateEvent>(HandleLightUpdate);
@@ -113,12 +112,18 @@ namespace Robust.Client.GameObjects
 
         private void AnythingMoved(ref MoveEvent args)
         {
-            var xforms = EntityManager.GetEntityQuery<TransformComponent>();
+            var pointQuery = EntityManager.GetEntityQuery<PointLightComponent>();
+            var spriteQuery = EntityManager.GetEntityQuery<SpriteComponent>();
+            var xformQuery = EntityManager.GetEntityQuery<TransformComponent>();
 
-            AnythingMovedSubHandler(args.Sender, xforms);
+            AnythingMovedSubHandler(args.Sender, xformQuery, pointQuery, spriteQuery);
         }
 
-        private void AnythingMovedSubHandler(EntityUid uid, EntityQuery<TransformComponent> xforms)
+        private void AnythingMovedSubHandler(
+            EntityUid uid,
+            EntityQuery<TransformComponent> xformQuery,
+            EntityQuery<PointLightComponent> pointQuery,
+            EntityQuery<SpriteComponent> spriteQuery)
         {
             // To avoid doing redundant updates (and we don't need to update a grid's children ever)
             if (!_checkedChildren.Add(uid) || EntityManager.HasComponent<RenderingTreeComponent>(uid)) return;
@@ -127,17 +132,19 @@ namespace Robust.Client.GameObjects
             // WHATEVER YOU DO, DON'T REPLACE THIS WITH SPAMMING EVENTS UNLESS YOU HAVE A GUARANTEE IT WON'T LAG THE GC.
             // (Struct-based events ok though)
             // Ironically this was lagging the GC lolz
-            if (EntityManager.TryGetComponent(uid, out SpriteComponent? sprite))
+            if (spriteQuery.TryGetComponent(uid, out var sprite))
                 QueueSpriteUpdate(sprite);
 
-            if (EntityManager.TryGetComponent(uid, out PointLightComponent? light))
+            if (pointQuery.TryGetComponent(uid, out var light))
                 QueueLightUpdate(light);
 
-            if (!xforms.TryGetComponent(uid, out var xform)) return;
+            if (!xformQuery.TryGetComponent(uid, out var xform)) return;
 
-            foreach (var child in xform.ChildEntities)
+            var childEnumerator = xform.ChildEnumerator;
+
+            while (childEnumerator.MoveNext(out var child))
             {
-                AnythingMovedSubHandler(child, xforms);
+                AnythingMovedSubHandler(child.Value, xformQuery, pointQuery, spriteQuery);
             }
         }
 
@@ -147,10 +154,6 @@ namespace Robust.Client.GameObjects
         // 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, ref EntParentChangedMessage args)
         {
@@ -180,10 +183,6 @@ namespace Robust.Client.GameObjects
         #endregion
 
         #region LightHandlers
-        private void LightMapChanged(EntityUid uid, PointLightComponent component, EntMapIdChangedMessage args)
-        {
-            QueueLightUpdate(component);
-        }
 
         private void LightParentChanged(EntityUid uid, PointLightComponent component, ref EntParentChangedMessage args)
         {
@@ -212,13 +211,6 @@ namespace Robust.Client.GameObjects
         }
         #endregion
 
-        public override void Shutdown()
-        {
-            base.Shutdown();
-            _mapManager.MapCreated -= MapManagerOnMapCreated;
-            _mapManager.OnGridCreated -= MapManagerOnGridCreated;
-        }
-
         private void OnTreeRemove(EntityUid uid, RenderingTreeComponent component, ComponentRemove args)
         {
             foreach (var sprite in component.SpriteTree)
@@ -235,9 +227,9 @@ namespace Robust.Client.GameObjects
             component.LightTree.Clear();
         }
 
-        private void MapManagerOnMapCreated(object? sender, MapEventArgs e)
+        private void MapManagerOnMapCreated(MapChangedEvent e)
         {
-            if (e.Map == MapId.Nullspace)
+            if (e.Destroyed || e.Map == MapId.Nullspace)
             {
                 return;
             }
@@ -245,9 +237,9 @@ namespace Robust.Client.GameObjects
             EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetMapEntityId(e.Map));
         }
 
-        private void MapManagerOnGridCreated(MapId mapId, GridId gridId)
+        private void MapManagerOnGridCreated(GridInitializeEvent ev)
         {
-            EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetGrid(gridId).GridEntityId);
+            EntityManager.EnsureComponent<RenderingTreeComponent>(_mapManager.GetGrid(ev.GridId).GridEntityId);
         }
 
         private RenderingTreeComponent? GetRenderTree(EntityUid entity, EntityQuery<TransformComponent> xforms)
@@ -369,13 +361,10 @@ namespace Robust.Client.GameObjects
         private Box2 SpriteAabbFunc(in SpriteComponent value)
         {
             var xforms = EntityManager.GetEntityQuery<TransformComponent>();
-
             var xform = xforms.GetComponent(value.Owner);
             var (worldPos, worldRot) = xform.GetWorldPositionRotation();
-            var bounds = new Box2Rotated(value.CalculateBoundingBox(worldPos), worldRot, worldPos);
-            var tree = GetRenderTree(value.Owner, xforms);
 
-            return tree == null ? bounds.CalcBoundingBox() : xforms.GetComponent(tree.Owner).InvWorldMatrix.TransformBox(bounds);
+            return SpriteAabbFunc(value, worldPos, worldRot, xforms);
         }
 
         private Box2 LightAabbFunc(in PointLightComponent value)
@@ -392,7 +381,7 @@ namespace Robust.Client.GameObjects
 
         private Box2 SpriteAabbFunc(SpriteComponent value, Vector2 worldPos, Angle worldRot, EntityQuery<TransformComponent> xforms)
         {
-            var bounds = new Box2Rotated(value.CalculateBoundingBox(worldPos), worldRot, worldPos);
+            var bounds = value.CalculateRotatedBoundingBox(worldPos, worldRot);
             var tree = GetRenderTree(value.Owner, xforms);
 
             return tree == null ? bounds.CalcBoundingBox() : xforms.GetComponent(tree.Owner).InvWorldMatrix.TransformBox(bounds);

Robust.Client/GameObjects/EntitySystems/ScaleVisualsSystem.cs

@@ -0,0 +1,24 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.GameObjects;
+
+public sealed class ScaleVisualsSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<AppearanceChangeEvent>(OnChangeData);
+    }
+
+    private void OnChangeData(ref AppearanceChangeEvent ev)
+    {
+        if (!ev.AppearanceData.TryGetValue(ScaleVisuals.Scale, out var scale) ||
+            ev.Sprite == null) return;
+
+        var vecScale = (Vector2)scale;
+
+        // Set it directly because prediction may call this multiple times.
+        ev.Sprite.Scale = vecScale;
+    }
+}

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

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using JetBrains.Annotations;
+using Robust.Client.Graphics;
+using Robust.Client.ResourceManagement;
+using Robust.Client.Utility;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Map;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.GameObjects;
+
+public sealed partial class SpriteSystem
+{
+    [Dependency] private readonly IPrototypeManager _proto = default!;
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+
+    private readonly Dictionary<string, IRsiStateLike> _cachedPrototypeIcons = new();
+
+    public Texture Frame0(SpriteSpecifier specifier)
+    {
+        return RsiStateLike(specifier).Default;
+    }
+
+    public IRsiStateLike RsiStateLike(SpriteSpecifier specifier)
+    {
+        switch (specifier)
+        {
+            case SpriteSpecifier.Texture tex:
+                return tex.GetTexture(_resourceCache);
+
+            case SpriteSpecifier.Rsi rsi:
+                return GetState(rsi);
+
+            case SpriteSpecifier.EntityPrototype prototypeIcon:
+                return GetPrototypeIcon(prototypeIcon.EntityPrototypeId);
+
+            default:
+                throw new NotSupportedException();
+        }
+    }
+
+    /// <summary>
+    ///     Returns an icon for a given <see cref="EntityPrototype"/> ID, or a fallback in case of an error.
+    ///     This method caches the result based on the prototype identifier.
+    /// </summary>
+    public IRsiStateLike GetPrototypeIcon(string prototype)
+    {
+        // Check if this prototype has been cached before, and if so return the result.
+        if (_cachedPrototypeIcons.TryGetValue(prototype, out var cachedResult))
+            return cachedResult;
+
+        if (!_proto.TryIndex<EntityPrototype>(prototype, out var entityPrototype))
+        {
+            // The specified prototype doesn't exist, return the fallback "error" sprite.
+            Logger.Error("Failed to load PrototypeIcon {0}", prototype);
+            return GetFallbackState();
+        }
+
+        // Generate the icon and cache it in case it's ever needed again.
+        var result = GetPrototypeIcon(entityPrototype);
+        _cachedPrototypeIcons[prototype] = result;
+
+        return result;
+    }
+
+    /// <summary>
+    ///     Returns an icon for a given <see cref="EntityPrototype"/> ID, or a fallback in case of an error.
+    ///     This method does NOT cache the result.
+    /// </summary>
+    public IRsiStateLike GetPrototypeIcon(EntityPrototype prototype)
+    {
+        // IconComponent takes precedence. If it has a valid icon, return that. Otherwise, continue as normal.
+        if (prototype.Components.TryGetValue("Icon", out var compData)
+            && compData is IconComponent {Icon: {} icon})
+        {
+            return icon.Default;
+        }
+
+        // If the prototype doesn't have a SpriteComponent, then there's nothing we can do but return the fallback.
+        if (!prototype.Components.ContainsKey("Sprite"))
+        {
+            return GetFallbackState();
+        }
+
+        // Finally, we use spawn a dummy entity to get its icon.
+        var dummy = Spawn(prototype.ID, MapCoordinates.Nullspace);
+        var spriteComponent = EnsureComp<SpriteComponent>(dummy);
+        var result = spriteComponent.Icon ?? GetFallbackState();
+        Del(dummy);
+
+        return result;
+    }
+
+    [Pure]
+    public RSI.State GetFallbackState()
+    {
+        return _resourceCache.GetFallback<RSIResource>().RSI["error"];
+    }
+
+    [Pure]
+    public RSI.State GetState(SpriteSpecifier.Rsi rsiSpecifier)
+    {
+        if (_resourceCache.TryGetResource<RSIResource>(
+                SharedSpriteComponent.TextureRoot / rsiSpecifier.RsiPath,
+                out var theRsi) &&
+            theRsi.RSI.TryGetState(rsiSpecifier.RsiState, out var state))
+        {
+            return state;
+        }
+
+        Logger.Error("Failed to load RSI {0}", rsiSpecifier.RsiPath);
+        return GetFallbackState();
+    }
+
+    private void OnPrototypesReloaded(PrototypesReloadedEventArgs protoReloaded)
+    {
+        // Check if any EntityPrototype has been changed.
+        if (!protoReloaded.ByType.TryGetValue(typeof(EntityPrototype), out var changedSet))
+            return;
+
+        // Remove all changed prototypes from the cache, if they're there.
+        foreach (var (prototype, _) in changedSet.Modified)
+        {
+            // Let's be lazy and not regenerate them until something needs them again.
+            _cachedPrototypeIcons.Remove(prototype);
+        }
+    }
+}

Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

@@ -11,7 +11,7 @@ namespace Robust.Client.GameObjects
     /// Updates the layer animation for every visible sprite.
     /// </summary>
     [UsedImplicitly]
-    public sealed class SpriteSystem : EntitySystem
+    public sealed partial class SpriteSystem : EntitySystem
     {
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly RenderingTreeSystem _treeSystem = default!;
@@ -23,9 +23,16 @@ namespace Robust.Client.GameObjects
         {
             base.Initialize();
 
+            _proto.PrototypesReloaded += OnPrototypesReloaded;
             SubscribeLocalEvent<SpriteUpdateInertEvent>(QueueUpdateInert);
         }
 
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            _proto.PrototypesReloaded -= OnPrototypesReloaded;
+        }
+
         private void QueueUpdateInert(SpriteUpdateInertEvent ev)
         {
             _inertUpdateQueue.Enqueue(ev.Sprite);

Robust.Client/GameObjects/EntitySystems/TransformSystem.cs

@@ -52,7 +52,8 @@ namespace Robust.Client.GameObjects
 
                 // Only lerp if parent didn't change.
                 // E.g. entering lockers would do it.
-                if (transform.LerpParent == transform.ParentUid)
+                if (transform.LerpParent == transform.ParentUid &&
+                    transform.ParentUid.IsValid())
                 {
                     if (transform.LerpDestination != null)
                     {
@@ -71,7 +72,7 @@ namespace Robust.Client.GameObjects
                     {
                         var lerpDest = transform.LerpAngle.Value;
                         var lerpSource = transform.LerpSourceAngle;
-                        if (lerpDest.Theta - lerpSource.Theta < MaxInterpolationAngle)
+                        if (Math.Abs(Angle.ShortestDistance(lerpDest, lerpSource)) < MaxInterpolationAngle)
                         {
                             transform.LocalRotation = Angle.Lerp(lerpSource, lerpDest, step);
                             // Setting LocalRotation clears LerpAngle so fix that.

Robust.Client/GameObjects/IClientEntityManagerInternal.cs

@@ -8,7 +8,7 @@ namespace Robust.Client.GameObjects
 
         EntityUid CreateEntity(string? prototypeName, EntityUid uid = default);
 
-        void InitializeEntity(EntityUid entity);
+        void InitializeEntity(EntityUid entity, MetaDataComponent? meta = null);
 
         void StartEntity(EntityUid entity);
     }

Robust.Client/GameStates/ClientDirtySystem.cs

@@ -0,0 +1,82 @@
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using Microsoft.Extensions.ObjectPool;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+using Robust.Shared.IoC;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.GameStates;
+
+/// <summary>
+/// Tracks dirty entities on the client for the purposes of gamestatemanager.
+/// </summary>
+internal sealed class ClientDirtySystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    private readonly Dictionary<GameTick, HashSet<EntityUid>> _dirtyEntities = new();
+
+    private ObjectPool<HashSet<EntityUid>> _dirtyPool =
+        new DefaultObjectPool<HashSet<EntityUid>>(new DefaultPooledObjectPolicy<HashSet<EntityUid>>(), 64);
+
+    // Keep it out of the pool because it's probably going to be a lot bigger.
+    private HashSet<EntityUid> _dirty = new(256);
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        EntityManager.EntityDirtied += OnEntityDirty;
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+        EntityManager.EntityDirtied -= OnEntityDirty;
+        _dirtyEntities.Clear();
+    }
+
+    internal void Reset()
+    {
+        foreach (var (_, sets) in _dirtyEntities)
+        {
+            sets.Clear();
+            _dirtyPool.Return(sets);
+        }
+
+        _dirtyEntities.Clear();
+    }
+
+    public IEnumerable<EntityUid> GetDirtyEntities(GameTick currentTick)
+    {
+        _dirty.Clear();
+
+        // This is just to avoid collection being modified during iteration unfortunately.
+        foreach (var (tick, dirty) in _dirtyEntities)
+        {
+            if (tick < currentTick) continue;
+            foreach (var ent in dirty)
+            {
+                _dirty.Add(ent);
+            }
+        }
+
+        return _dirty;
+    }
+
+    private void OnEntityDirty(EntityUid e)
+    {
+        if (e.IsClientSide()) return;
+
+        var tick = _timing.CurTick;
+        if (!_dirtyEntities.TryGetValue(tick, out var ents))
+        {
+            ents = _dirtyPool.Get();
+            _dirtyEntities[tick] = ents;
+        }
+
+        ents.Add(e);
+    }
+}

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -21,6 +21,7 @@ using Robust.Shared.Map;
 using Robust.Shared.Network;
 using Robust.Shared.Network.Messages;
 using Robust.Shared.Players;
+using Robust.Shared.Profiling;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
@@ -45,7 +46,6 @@ namespace Robust.Client.GameStates
 
         [Dependency] private readonly IComponentFactory _compFactory = default!;
         [Dependency] private readonly IClientEntityManagerInternal _entities = default!;
-        [Dependency] private readonly IEntityLookup _lookup = default!;
         [Dependency] private readonly IPlayerManager _players = default!;
         [Dependency] private readonly IClientNetManager _network = default!;
         [Dependency] private readonly IBaseClient _client = default!;
@@ -55,6 +55,7 @@ namespace Robust.Client.GameStates
         [Dependency] private readonly IEntitySystemManager _entitySystemManager = default!;
         [Dependency] private readonly IClientEntityManager _entityManager = default!;
         [Dependency] private readonly IInputManager _inputManager = default!;
+        [Dependency] private readonly ProfManager _prof = default!;
 #if EXCEPTION_TOLERANCE
         [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
 #endif
@@ -225,18 +226,28 @@ namespace Robust.Client.GameStates
                     ResetPredictedEntities(_timing.CurTick);
                 }
 
-                if (!curState.Extrapolated)
+                using (_prof.Group("FullRep"))
                 {
-                    _processor.UpdateFullRep(curState);
+                    if (!curState.Extrapolated)
+                    {
+                        _processor.UpdateFullRep(curState);
+                    }
                 }
 
                 // Store last tick we got from the GameStateProcessor.
                 _lastProcessedTick = _timing.CurTick;
 
                 // apply current state
-                var createdEntities = ApplyGameState(curState, nextState);
+                List<EntityUid> createdEntities;
+                using (_prof.Group("ApplyGameState"))
+                {
+                    createdEntities = ApplyGameState(curState, nextState);
+                }
 
-                MergeImplicitData(createdEntities);
+                using (_prof.Group("MergeImplicitData"))
+                {
+                    MergeImplicitData(createdEntities);
+                }
 
                 if (_lastProcessedSeq < curState.LastProcessedInput)
                 {
@@ -271,6 +282,7 @@ namespace Robust.Client.GameStates
 
             if (IsPredictionEnabled)
             {
+                using var _p = _prof.Group("Prediction");
                 using var _ = _timing.StartPastPredictionArea();
 
                 if (_pendingInputs.Count > 0)
@@ -291,6 +303,8 @@ namespace Robust.Client.GameStates
 
                 for (var t = _lastProcessedTick.Value + 1; t <= targetTick; t++)
                 {
+                    var groupStart = _prof.WriteGroupStart();
+
                     var tick = new GameTick(t);
                     _timing.CurTick = tick;
 
@@ -322,37 +336,43 @@ namespace Robust.Client.GameStates
 
                     if (t != targetTick)
                     {
-                        // Don't run EntitySystemManager.TickUpdate if this is the target tick,
-                        // because the rest of the main loop will call into it with the target tick later,
-                        // and it won't be a past prediction.
-                        _entitySystemManager.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: false);
-                        ((IBroadcastEventBusInternal) _entities.EventBus).ProcessEventQueue();
+                        using (_prof.Group("Systems"))
+                        {
+                            // Don't run EntitySystemManager.TickUpdate if this is the target tick,
+                            // because the rest of the main loop will call into it with the target tick later,
+                            // and it won't be a past prediction.
+                            _entitySystemManager.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: false);
+                        }
+
+                        using (_prof.Group("Event queue"))
+                        {
+                            ((IBroadcastEventBusInternal) _entities.EventBus).ProcessEventQueue();
+                        }
                     }
+
+                    _prof.WriteGroupEnd(groupStart, "Prediction tick", ProfData.Int64(t));
                 }
             }
 
-            _entities.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: !IsPredictionEnabled);
-
-            _lookup.Update();
+            using (_prof.Group("Tick"))
+            {
+                _entities.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: !IsPredictionEnabled);
+            }
         }
 
         private void ResetPredictedEntities(GameTick curTick)
         {
-            foreach (var meta in _entityManager.EntityQuery<MetaDataComponent>(true))
+            using var _ = _prof.Group("ResetPredictedEntities");
+
+            var countReset = 0;
+            var system = _entitySystemManager.GetEntitySystem<ClientDirtySystem>();
+            var query = _entityManager.GetEntityQuery<MetaDataComponent>();
+
+            foreach (var entity in system.GetDirtyEntities(curTick))
             {
-                var entity = meta.Owner;
-
-                // TODO: 99% there's an off-by-one here.
-                if (entity.IsClientSide() || meta.EntityLastModifiedTick < curTick)
-                {
-                    continue;
-                }
-
                 // Check log level first to avoid the string alloc.
                 if (_sawmill.Level <= LogLevel.Debug)
-                {
                     _sawmill.Debug($"Entity {entity} was made dirty.");
-                }
 
                 if (!_processor.TryGetLastServerStates(entity, out var last))
                 {
@@ -360,6 +380,8 @@ namespace Robust.Client.GameStates
                     continue;
                 }
 
+                countReset += 1;
+
                 // TODO: handle component deletions/creations.
                 foreach (var (netId, comp) in _entityManager.GetNetComponents(entity))
                 {
@@ -370,13 +392,21 @@ namespace Robust.Client.GameStates
                         continue;
                     }
 
-                    _sawmill.Debug($"  And also its component {comp.GetType()}");
+                    if (_sawmill.Level <= LogLevel.Debug)
+                        _sawmill.Debug($"  And also its component {comp.GetType()}");
+
                     // TODO: Handle interpolation.
                     var handleState = new ComponentHandleState(compState, null);
                     _entities.EventBus.RaiseComponentEvent(comp, ref handleState);
                     comp.HandleComponentState(compState, null);
+                    comp.LastModifiedTick = curTick;
                 }
+                query.GetComponent(entity).EntityLastModifiedTick = curTick;
             }
+
+            system.Reset();
+
+            _prof.WriteValue("Reset count", ProfData.Int32(countReset));
         }
 
         private void MergeImplicitData(List<EntityUid> createdEntities)
@@ -412,28 +442,47 @@ namespace Robust.Client.GameStates
 
         private void AckGameState(GameTick sequence)
         {
-            var msg = _network.CreateNetMessage<MsgStateAck>();
+            var msg = new MsgStateAck();
             msg.Sequence = sequence;
             _network.ClientSendMessage(msg);
         }
 
         private List<EntityUid> ApplyGameState(GameState curState, GameState? nextState)
         {
-            _config.TickProcessMessages();
-            _mapManager.ApplyGameStatePre(curState.MapData, curState.EntityStates.Span);
-            var createdEntities = ApplyEntityStates(curState.EntityStates.Span, curState.EntityDeletions.Span,
-                nextState != null ? nextState.EntityStates.Span : default);
-            _players.ApplyPlayerStates(curState.PlayerStates.Value ?? Array.Empty<PlayerState>());
-            _mapManager.ApplyGameStatePost(curState.MapData);
+            using (_prof.Group("Config"))
+            {
+                _config.TickProcessMessages();
+            }
+
+            using (_prof.Group("Map Pre"))
+            {
+                _mapManager.ApplyGameStatePre(curState.MapData, curState.EntityStates.Span);
+            }
+
+            List<EntityUid> createdEntities;
+            using (_prof.Group("Entity"))
+            {
+                createdEntities = ApplyEntityStates(curState.EntityStates.Span, curState.EntityDeletions.Span,
+                    nextState != null ? nextState.EntityStates.Span : default);
+            }
+
+            using (_prof.Group("Player"))
+            {
+                _players.ApplyPlayerStates(curState.PlayerStates.Value ?? Array.Empty<PlayerState>());
+            }
+
+            using (_prof.Group("Callback"))
+            {
+                GameStateApplied?.Invoke(new GameStateAppliedArgs(curState));
+            }
 
-            GameStateApplied?.Invoke(new GameStateAppliedArgs(curState));
             return createdEntities;
         }
 
         private List<EntityUid> ApplyEntityStates(ReadOnlySpan<EntityState> curEntStates, ReadOnlySpan<EntityUid> deletions,
             ReadOnlySpan<EntityState> nextEntStates)
         {
-            var toApply = new Dictionary<EntityUid, (EntityState?, EntityState?)>();
+            var toApply = new Dictionary<EntityUid, (EntityState?, EntityState?)>(curEntStates.Length);
             var toInitialize = new List<EntityUid>();
             var created = new List<EntityUid>();
 
@@ -541,6 +590,9 @@ namespace Robust.Client.GameStates
             }
 #endif
 
+            _prof.WriteValue("Created", ProfData.Int32(created.Count));
+            _prof.WriteValue("Applied", ProfData.Int32(toApply.Count));
+
             return created;
         }
 
@@ -552,6 +604,8 @@ namespace Robust.Client.GameStates
 
             if (curState != null)
             {
+                compStateWork.EnsureCapacity(curState.ComponentChanges.Span.Length);
+
                 foreach (var compChange in curState.ComponentChanges.Span)
                 {
                     if (compChange.Deleted)
@@ -584,6 +638,8 @@ namespace Robust.Client.GameStates
 
             if (nextState != null)
             {
+                compStateWork.EnsureCapacity(compStateWork.Count + nextState.ComponentChanges.Span.Length);
+
                 foreach (var compState in nextState.ComponentChanges.Span)
                 {
                     if (compStateWork.TryGetValue(compState.NetID, out var state))

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

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

Robust.Client/Graphics/ClientEye/EyeManager.cs

@@ -2,6 +2,7 @@ using Robust.Client.UserInterface;
 using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 
@@ -132,6 +133,12 @@ namespace Robust.Client.Graphics
 
         public ScreenCoordinates MapToScreen(MapCoordinates point)
         {
+            if (CurrentEye.Position.MapId != point.MapId)
+            {
+                Logger.Error($"Attempted to convert map coordinates ({point}) to screen coordinates with an eye on another map ({CurrentEye.Position.MapId})");
+                return new(default, WindowId.Invalid);
+            }
+
             return new(WorldToScreen(point.Position), MainViewport.Window?.Id ?? default);
         }
 

Robust.Client/Graphics/Clyde/Clyde.Constants.cs

@@ -5,20 +5,19 @@ namespace Robust.Client.Graphics.Clyde
         private static readonly (string, uint)[] BaseShaderAttribLocations =
         {
             ("aPos", 0),
-            ("tCoord", 1)
+            ("tCoord", 1),
+            ("modulate", 2)
         };
 
         private const int UniIModUV = 0;
         private const int UniIModelMatrix = 1;
-        private const int UniIModulate = 2;
-        private const int UniITexturePixelSize = 3;
-        private const int UniIMainTexture = 4;
-        private const int UniILightTexture = 5;
-        private const int UniCount = 6;
+        private const int UniITexturePixelSize = 2;
+        private const int UniIMainTexture = 3;
+        private const int UniILightTexture = 4;
+        private const int UniCount = 5;
 
         private const string UniModUV = "modifyUV";
         private const string UniModelMatrix = "modelMatrix";
-        private const string UniModulate = "modulate";
         private const string UniTexturePixelSize = "TEXTURE_PIXEL_SIZE";
         private const string UniMainTexture = "TEXTURE";
         private const string UniLightTexture = "lightMap";

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

@@ -1,7 +1,5 @@
 using System;
-using System.Buffers;
 using System.Collections.Generic;
-using System.Diagnostics;
 using OpenToolkit.Graphics.OpenGL4;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
@@ -18,8 +16,8 @@ namespace Robust.Client.Graphics.Clyde
         private readonly Dictionary<GridId, Dictionary<Vector2i, MapChunkData>> _mapChunkData =
             new();
 
-        private int _verticesPerChunk(IMapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * 4;
-        private int _indicesPerChunk(IMapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * GetQuadBatchIndexCount();
+        private int _verticesPerChunk(MapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * 4;
+        private int _indicesPerChunk(MapChunk chunk) => chunk.ChunkSize * chunk.ChunkSize * GetQuadBatchIndexCount();
 
         private void _drawGrids(Viewport viewport, Box2Rotated worldBounds, IEye eye)
         {
@@ -39,7 +37,6 @@ namespace Robust.Client.Graphics.Clyde
             gridProgram.SetUniformTextureMaybe(UniIMainTexture, TextureUnit.Texture0);
             gridProgram.SetUniformTextureMaybe(UniILightTexture, TextureUnit.Texture1);
             gridProgram.SetUniform(UniIModUV, new Vector4(0, 0, 1, 1));
-            gridProgram.SetUniform(UniIModulate, Color.White);
 
             foreach (var mapGrid in _mapManager.FindGridsIntersecting(mapId, worldBounds))
             {
@@ -52,7 +49,7 @@ namespace Robust.Client.Graphics.Clyde
 
                 var transform = _entityManager.GetComponent<TransformComponent>(grid.GridEntityId);
                 gridProgram.SetUniform(UniIModelMatrix, transform.WorldMatrix);
-                grid.GetMapChunks(worldBounds, out var enumerator);
+                var enumerator = grid.GetMapChunks(worldBounds);
 
                 while (enumerator.MoveNext(out var chunk))
                 {
@@ -78,7 +75,7 @@ namespace Robust.Client.Graphics.Clyde
             }
         }
 
-        private void _updateChunkMesh(IMapGrid grid, IMapChunk chunk)
+        private void _updateChunkMesh(IMapGrid grid, MapChunk chunk)
         {
             var data = _mapChunkData[grid.Index];
 
@@ -91,25 +88,41 @@ namespace Robust.Client.Graphics.Clyde
             Span<Vertex2D> vertexBuffer = stackalloc Vertex2D[_verticesPerChunk(chunk)];
 
             var i = 0;
-            foreach (var tile in chunk)
+            var cSz = grid.ChunkSize;
+            var cScaled = chunk.Indices * cSz;
+            for (ushort x = 0; x < cSz; x++)
             {
-                var regionMaybe = _tileDefinitionManager.TileAtlasRegion(tile.Tile);
-                if (regionMaybe == null)
+                for (ushort y = 0; y < cSz; y++)
                 {
-                    continue;
+                    var tile = chunk.GetTile(x, y);
+                    if (tile.IsEmpty)
+                        continue;
+
+                    var regionMaybe = _tileDefinitionManager.TileAtlasRegion(tile);
+
+                    Box2 region;
+                    if (regionMaybe == null || regionMaybe.Length <= tile.Variant)
+                    {
+                        region = _tileDefinitionManager.ErrorTileRegion;
+                    }
+                    else
+                    {
+                        region = regionMaybe[tile.Variant];
+                    }
+
+                    var gx = x + cScaled.X;
+                    var gy = y + cScaled.Y;
+
+                    var vIdx = i * 4;
+                    vertexBuffer[vIdx + 0] = new Vertex2D(gx, gy, region.Left, region.Bottom, Color.White);
+                    vertexBuffer[vIdx + 1] = new Vertex2D(gx + 1, gy, region.Right, region.Bottom, Color.White);
+                    vertexBuffer[vIdx + 2] = new Vertex2D(gx + 1, gy + 1, region.Right, region.Top, Color.White);
+                    vertexBuffer[vIdx + 3] = new Vertex2D(gx, gy + 1, region.Left, region.Top, Color.White);
+                    var nIdx = i * GetQuadBatchIndexCount();
+                    var tIdx = (ushort)(i * 4);
+                    QuadBatchIndexWrite(indexBuffer, ref nIdx, tIdx);
+                    i += 1;
                 }
-
-                var region = regionMaybe.Value;
-
-                var vIdx = i * 4;
-                vertexBuffer[vIdx + 0] = new Vertex2D(tile.X, tile.Y, region.Left, region.Bottom);
-                vertexBuffer[vIdx + 1] = new Vertex2D(tile.X + 1, tile.Y, region.Right, region.Bottom);
-                vertexBuffer[vIdx + 2] = new Vertex2D(tile.X + 1, tile.Y + 1, region.Right, region.Top);
-                vertexBuffer[vIdx + 3] = new Vertex2D(tile.X, tile.Y + 1, region.Left, region.Top);
-                var nIdx = i * GetQuadBatchIndexCount();
-                var tIdx = (ushort) (i * 4);
-                QuadBatchIndexWrite(indexBuffer, ref nIdx, tIdx);
-                i += 1;
             }
 
             GL.BindVertexArray(datum.VAO);
@@ -122,13 +135,13 @@ namespace Robust.Client.Graphics.Clyde
             datum.TileCount = i;
         }
 
-        private MapChunkData _initChunkBuffers(IMapGrid grid, IMapChunk chunk)
+        private unsafe MapChunkData _initChunkBuffers(IMapGrid grid, MapChunk chunk)
         {
             var vao = GenVertexArray();
             BindVertexArray(vao);
             CheckGlError();
 
-            var vboSize = _verticesPerChunk(chunk) * Vertex2D.SizeOf;
+            var vboSize = _verticesPerChunk(chunk) * sizeof(Vertex2D);
             var eboSize = _indicesPerChunk(chunk) * sizeof(ushort);
 
             var vbo = new GLBuffer(this, BufferTarget.ArrayBuffer, BufferUsageHint.DynamicDraw,
@@ -137,12 +150,7 @@ namespace Robust.Client.Graphics.Clyde
                 eboSize, $"Grid {grid.Index} chunk {chunk.Indices} EBO");
 
             ObjectLabelMaybe(ObjectLabelIdentifier.VertexArray, vao, $"Grid {grid.Index} chunk {chunk.Indices} VAO");
-            // Vertex Coords
-            GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, Vertex2D.SizeOf, 0);
-            GL.EnableVertexAttribArray(0);
-            // Texture Coords.
-            GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, Vertex2D.SizeOf, 2 * sizeof(float));
-            GL.EnableVertexAttribArray(1);
+            SetupVAOLayout();
             CheckGlError();
 
             // Assign VBO and EBO to VAO.
@@ -159,7 +167,7 @@ namespace Robust.Client.Graphics.Clyde
             return datum;
         }
 
-        private bool _isChunkDirty(IMapGrid grid, IMapChunk chunk)
+        private bool _isChunkDirty(IMapGrid grid, MapChunk chunk)
         {
             var data = _mapChunkData[grid.Index];
             return !data.TryGetValue(chunk.Indices, out var datum) || datum.Dirty;
@@ -175,7 +183,7 @@ namespace Robust.Client.Graphics.Clyde
             // Don't need to set it if we don't have an entry since lack of an entry is treated as dirty.
         }
 
-        private void _updateOnGridModified(object? sender, GridChangedEventArgs args)
+        private void _updateOnGridModified(GridModifiedEvent args)
         {
             foreach (var (pos, _) in args.Modified)
             {
@@ -185,21 +193,23 @@ namespace Robust.Client.Graphics.Clyde
             }
         }
 
-        private void _updateTileMapOnUpdate(object? sender, TileChangedEventArgs args)
+        private void _updateTileMapOnUpdate(TileChangedEvent args)
         {
             var grid = _mapManager.GetGrid(args.NewTile.GridIndex);
             var chunk = grid.GridTileToChunkIndices(new Vector2i(args.NewTile.X, args.NewTile.Y));
             _setChunkDirty(grid, chunk);
         }
 
-        private void _updateOnGridCreated(MapId mapId, GridId gridId)
+        private void _updateOnGridCreated(GridStartupEvent ev)
         {
+            var gridId = ev.GridId;
             Logger.DebugS("grid", $"Adding {gridId} to grid renderer");
             _mapChunkData.Add(gridId, new Dictionary<Vector2i, MapChunkData>());
         }
 
-        private void _updateOnGridRemoved(MapId mapId, GridId gridId)
+        private void _updateOnGridRemoved(GridRemovalEvent ev)
         {
+            var gridId = ev.GridId;
             Logger.DebugS("grid", $"Removing {gridId} from grid renderer");
 
             var data = _mapChunkData[gridId];

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

@@ -13,7 +13,8 @@ using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
+using Robust.Shared.Profiling;
+using OGLTextureWrapMode = OpenToolkit.Graphics.OpenGL.TextureWrapMode;
 
 namespace Robust.Client.Graphics.Clyde
 {
@@ -24,11 +25,19 @@ namespace Robust.Client.Graphics.Clyde
     {
         public ClydeDebugLayers DebugLayers { get; set; }
 
-        private readonly RefList<(SpriteComponent sprite, Matrix3 worldMatrix, Angle worldRotation, float yWorldPos)>
+        private readonly RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRotation, Box2 spriteScreenBB)>
             _drawingSpriteList
                 =
                 new();
 
+        // TODO allow this scale to be passed with PostShader as variable
+        /// <summary>
+        ///     Some shaders that enlarge the final sprite, like emission or highlight effects, need to use a slightly larger render target.
+        /// </summary>
+        public static float PostShadeScale = 1.25f;
+
+        private List<Overlay> _overlays = new();
+
         public void Render()
         {
             CheckTransferringScreenshots();
@@ -89,6 +98,7 @@ namespace Robust.Client.Graphics.Clyde
             ClearFramebuffer(_userInterfaceManager.GetMainClearColor());
 
             using (DebugGroup("UI"))
+            using (_prof.Group("UI"))
             {
                 _userInterfaceManager.Render(_renderHandle);
                 FlushRenderQueue();
@@ -96,29 +106,46 @@ namespace Robust.Client.Graphics.Clyde
 
             TakeScreenshot(ScreenshotType.Final);
 
-            // And finally, swap those buffers!
-            SwapAllBuffers();
+            using (_prof.Group("Swap buffers"))
+            {
+                // And finally, swap those buffers!
+                SwapAllBuffers();
+            }
+
+            using (_prof.Group("Stats"))
+            {
+                _prof.WriteValue("GL Draw Calls", ProfData.Int32(_debugStats.LastGLDrawCalls));
+                _prof.WriteValue("Clyde Draw Calls", ProfData.Int32(_debugStats.LastClydeDrawCalls));
+                _prof.WriteValue("Batches", ProfData.Int32(_debugStats.LastBatches));
+                _prof.WriteValue("Max Batch Verts", ProfData.Int32(_debugStats.LargestBatchVertices));
+                _prof.WriteValue("Max Batch Idxes", ProfData.Int32(_debugStats.LargestBatchIndices));
+                _prof.WriteValue("Lights", ProfData.Int32(_debugStats.TotalLights));
+            }
+        }
+
+        private void RenderSingleOverlay(Overlay overlay, Viewport vp, OverlaySpace space, in Box2 worldBox, in Box2Rotated worldBounds)
+        {
+            if (overlay.RequestScreenTexture)
+            {
+                FlushRenderQueue();
+                UpdateOverlayScreenTexture(space, vp.RenderTarget);
+            }
+
+            if (overlay.OverwriteTargetFrameBuffer())
+            {
+                ClearFramebuffer(default);
+            }
+
+            overlay.ClydeRender(_renderHandle, space, null, vp, new UIBox2i((0, 0), vp.Size), worldBox, worldBounds);
         }
 
         private void RenderOverlays(Viewport vp, OverlaySpace space, in Box2 worldBox, in Box2Rotated worldBounds)
         {
             using (DebugGroup($"Overlays: {space}"))
             {
-                var list = GetOverlaysForSpace(space);
-                foreach (var overlay in list)
+                foreach (var overlay in GetOverlaysForSpace(space))
                 {
-                    if (overlay.RequestScreenTexture)
-                    {
-                        FlushRenderQueue();
-                        UpdateOverlayScreenTexture(space, vp.RenderTarget);
-                    }
-
-                    if (overlay.OverwriteTargetFrameBuffer())
-                    {
-                        ClearFramebuffer(default);
-                    }
-
-                    overlay.ClydeRender(_renderHandle, space, null, vp, new UIBox2i((0, 0), vp.Size), worldBox, worldBounds);
+                    RenderSingleOverlay(overlay, vp, space, worldBox, worldBounds);
                 }
 
                 FlushRenderQueue();
@@ -132,11 +159,13 @@ namespace Robust.Client.Graphics.Clyde
             OverlaySpace space,
             in UIBox2i bounds)
         {
+            using var _ = _prof.Group($"Overlays SS {space}");
+
             var list = GetOverlaysForSpace(space);
 
             var worldAABB = CalcWorldAABB(vp);
             var worldBounds = CalcWorldBounds(vp);
-            var args = new OverlayDrawArgs(space, vpControl, vp, handle, bounds, worldAABB, worldBounds);
+            var args = new OverlayDrawArgs(space, vpControl, vp, handle, bounds, vp.Eye!.Position.MapId, worldAABB, worldBounds);
 
             foreach (var overlay in list)
             {
@@ -146,19 +175,19 @@ namespace Robust.Client.Graphics.Clyde
 
         private List<Overlay> GetOverlaysForSpace(OverlaySpace space)
         {
-            var list = new List<Overlay>();
+            _overlays.Clear();
 
             foreach (var overlay in _overlayManager.AllOverlays)
             {
                 if ((overlay.Space & space) != 0)
                 {
-                    list.Add(overlay);
+                    _overlays.Add(overlay);
                 }
             }
 
-            list.Sort(OverlayComparer.Instance);
+            _overlays.Sort(OverlayComparer.Instance);
 
-            return list;
+            return _overlays;
         }
 
         private ClydeTexture? ScreenBufferTexture;
@@ -185,6 +214,12 @@ namespace Robust.Client.Graphics.Clyde
                 if (lastFrameSize != texture.Size)
                 {
                     GL.BindTexture(TextureTarget.Texture2D, screenBufferHandle.Handle);
+
+                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS,
+                        (int)OGLTextureWrapMode.MirroredRepeat);
+                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT,
+                        (int)OGLTextureWrapMode.MirroredRepeat);
+
                     GL.TexImage2D(TextureTarget.Texture2D, 0,
                         _hasGLSrgb ? PixelInternalFormat.Srgb8Alpha8 : PixelInternalFormat.Rgba8, texture.Size.X,
                         texture.Size.Y, 0,
@@ -205,7 +240,6 @@ namespace Robust.Client.Graphics.Clyde
             return false;
         }
 
-
         private void DrawEntities(Viewport viewport, Box2Rotated worldBounds, Box2 worldAABB, IEye eye)
         {
             var mapId = eye.Position.MapId;
@@ -217,21 +251,10 @@ namespace Robust.Client.Graphics.Clyde
             RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowEntities, worldAABB, worldBounds);
 
             var screenSize = viewport.Size;
-            eye.GetViewMatrix(out var eyeMatrix, eye.Scale);
 
-            ProcessSpriteEntities(mapId, eyeMatrix, worldBounds, _drawingSpriteList);
+            ProcessSpriteEntities(mapId, viewport, eye, worldBounds, _drawingSpriteList);
 
-            var worldOverlays = new List<Overlay>();
-
-            foreach (var overlay in _overlayManager.AllOverlays)
-            {
-                if ((overlay.Space & OverlaySpace.WorldSpace) != 0)
-                {
-                    worldOverlays.Add(overlay);
-                }
-            }
-
-            worldOverlays.Sort(OverlayComparer.Instance);
+            var worldOverlays = GetOverlaysForSpace(OverlaySpace.WorldSpaceEntities);
 
             // We use a separate list for indexing so that the sort is faster.
             var indexList = ArrayPool<int>.Shared.Rent(_drawingSpriteList.Count);
@@ -242,64 +265,39 @@ namespace Robust.Client.Graphics.Clyde
             }
 
             var overlayIndex = 0;
+            RenderTexture? entityPostRenderTarget = null;
             Array.Sort(indexList, 0, _drawingSpriteList.Count, new SpriteDrawingOrderComparer(_drawingSpriteList));
 
+            bool flushed = false;
             for (var i = 0; i < _drawingSpriteList.Count; i++)
             {
                 ref var entry = ref _drawingSpriteList[indexList[i]];
-                var flushed = false;
 
                 for (var j = overlayIndex; j < worldOverlays.Count; j++)
                 {
+                    overlayIndex = j;
                     var overlay = worldOverlays[j];
 
-                    if (overlay.ZIndex <= entry.sprite.DrawDepth)
+                    if (overlay.ZIndex > entry.sprite.DrawDepth)
                     {
-                        if (!flushed)
-                        {
-                            FlushRenderQueue();
-                            flushed = true;
-                        }
-
-                        overlay.ClydeRender(
-                            _renderHandle,
-                            OverlaySpace.WorldSpace,
-                            null,
-                            viewport,
-                            new UIBox2i((0, 0), viewport.Size),
-                            worldAABB,
-                            worldBounds);
-                        overlayIndex = j;
-                        continue;
+                        flushed = false;
+                        break;
                     }
 
-                    break;
+                    if (!flushed)
+                    {
+                        FlushRenderQueue();
+                        flushed = true;
+                    }
+
+                    RenderSingleOverlay(overlay, viewport, OverlaySpace.WorldSpaceEntities, worldAABB, worldBounds);
                 }
 
-                var matrix = entry.worldMatrix;
-                var worldPosition = new Vector2(matrix.R0C2, matrix.R1C2);
-
-                RenderTexture? entityPostRenderTarget = null;
                 Vector2i roundedPos = default;
                 if (entry.sprite.PostShader != null)
                 {
-                    // calculate world bounding box
-                    var spriteBB = entry.sprite.CalculateBoundingBox(worldPosition);
-                    var spriteLB = spriteBB.BottomLeft;
-                    var spriteRT = spriteBB.TopRight;
-
-                    // finally we can calculate screen bounding in pixels
-                    var screenLB = viewport.WorldToLocal(spriteLB);
-                    var screenRT = viewport.WorldToLocal(spriteRT);
-
-                    // we need to scale RT a for effects like emission or highlight
-                    // scale can be passed with PostShader as variable in future
-                    var postShadeScale = 1.25f;
-                    var screenSpriteSize = (Vector2i) ((screenRT - screenLB) * postShadeScale).Rounded();
-
-                    // Rotate the vector by the eye angle, otherwise the bounding box will be incorrect
-                    screenSpriteSize = (Vector2i) eye.Rotation.RotateVec(screenSpriteSize).Rounded();
-                    screenSpriteSize.Y = -screenSpriteSize.Y;
+                    // get the size of the sprite on screen, scaled slightly to allow for shaders that increase the final sprite size.
+                    var screenSpriteSize = (Vector2i) (entry.spriteScreenBB.Size * PostShadeScale).Rounded();
 
                     // I'm not 100% sure why it works, but without it post-shader
                     // can be lower or upper by 1px than original sprite depending on sprite rotation or scale
@@ -312,26 +310,41 @@ namespace Robust.Client.Graphics.Clyde
                     // check that sprite size is valid
                     if (screenSpriteSize.X > 0 && screenSpriteSize.Y > 0)
                     {
-                        // create new render texture with correct sprite size
-                        entityPostRenderTarget = CreateRenderTarget(screenSpriteSize,
-                            new RenderTargetFormatParameters(RenderTargetColorFormat.Rgba8Srgb, true),
-                            name: nameof(entityPostRenderTarget));
+                        // This is really bare-bones render target re-use logic. One problem is that if it ever draws a
+                        // single large entity in a frame, the render target may be way to big for every subsequent
+                        // entity. But the vast majority of sprites are currently all 32x32, so it doesn't matter all that
+                        // much.
+                        //
+                        // Also, if there are many differenty sizes, and they all happen to be drawn in order of
+                        // increasing size, then this will still generate a whole bunch of render targets. So maybe
+                        // iterate once _drawingSpriteList, check sprite sizes, and decide what render targets to create
+                        // based off of that?
+                        //
+                        // TODO PERFORMANCE better renderTarget re-use / caching.
+
+                        if (entityPostRenderTarget == null
+                            || entityPostRenderTarget.Size.X < screenSpriteSize.X
+                            || entityPostRenderTarget.Size.Y < screenSpriteSize.Y)
+                        {
+                            entityPostRenderTarget = CreateRenderTarget(screenSpriteSize,
+                                new RenderTargetFormatParameters(RenderTargetColorFormat.Rgba8Srgb, true),
+                                name: nameof(entityPostRenderTarget));
+                        }
+                        
                         _renderHandle.UseRenderTarget(entityPostRenderTarget);
                         _renderHandle.Clear(new Color());
 
                         // Calculate viewport so that the entity thinks it's drawing to the same position,
                         // which is necessary for light application,
                         // but it's ACTUALLY drawing into the center of the render target.
-                        var spritePos = spriteBB.Center;
-                        var screenPos = viewport.WorldToLocal(spritePos);
-                        var (roundedX, roundedY) = roundedPos = (Vector2i) screenPos;
-                        var flippedPos = new Vector2i(roundedX, screenSize.Y - roundedY);
+                        roundedPos = (Vector2i) entry.spriteScreenBB.Center;
+                        var flippedPos = new Vector2i(roundedPos.X, screenSize.Y - roundedPos.Y);
                         flippedPos -= entityPostRenderTarget.Size / 2;
                         _renderHandle.Viewport(Box2i.FromDimensions(-flippedPos, screenSize));
                     }
                 }
 
-                entry.sprite.Render(_renderHandle.DrawingHandleWorld, eye.Rotation, in entry.worldRotation, in worldPosition);
+                entry.sprite.Render(_renderHandle.DrawingHandleWorld, eye.Rotation, in entry.worldRotation, in entry.worldPos);
 
                 if (entry.sprite.PostShader != null && entityPostRenderTarget != null)
                 {
@@ -356,30 +369,49 @@ namespace Robust.Client.Graphics.Clyde
 
                     _renderHandle.SetProjView(oldProj, oldView);
                     _renderHandle.UseShader(null);
-
-                    // TODO: cache this properly across frames.
-                    entityPostRenderTarget.DisposeDeferred();
                 }
             }
 
+            // draw remainder of overlays
+            for (var j = overlayIndex; j < worldOverlays.Count; j++)
+            {
+                if (!flushed)
+                {
+                    FlushRenderQueue();
+                    flushed = true;
+                }
+
+                RenderSingleOverlay(worldOverlays[j], viewport, OverlaySpace.WorldSpaceEntities, worldAABB, worldBounds);
+            }
+
             ArrayPool<int>.Shared.Return(indexList);
+            entityPostRenderTarget?.DisposeDeferred();
 
             _drawingSpriteList.Clear();
             FlushRenderQueue();
         }
 
         [MethodImpl(MethodImplOptions.NoInlining)]
-        private void ProcessSpriteEntities(MapId map, Matrix3 eyeMatrix, Box2Rotated worldBounds,
-            RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> list)
+        private void ProcessSpriteEntities(MapId map, Viewport view, IEye eye, Box2Rotated worldBounds,
+            RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRot, Box2 spriteScreenBB)> list)
         {
             var xforms = _entityManager.GetEntityQuery<TransformComponent>();
 
+            // Construct a matrix equivalent for Viewport.WorldToLocal()
+            eye.GetViewMatrix(out var viewMatrix, view.RenderScale);
+            var uiProjmatrix = Matrix3.Identity;
+            uiProjmatrix.R0C0 = EyeManager.PixelsPerMeter;
+            uiProjmatrix.R1C1 = -EyeManager.PixelsPerMeter;
+            uiProjmatrix.R0C2 = view.Size.X / 2f;
+            uiProjmatrix.R1C2 = view.Size.Y / 2f;
+            var worldToLocal = viewMatrix * uiProjmatrix;
+
             foreach (var comp in _entitySystemManager.GetEntitySystem<RenderingTreeSystem>().GetRenderTrees(map, worldBounds))
             {
                 var bounds = xforms.GetComponent(comp.Owner).InvWorldMatrix.TransformBox(worldBounds);
 
                 comp.SpriteTree.QueryAabb(ref list, (
-                    ref RefList<(SpriteComponent sprite, Matrix3 matrix, Angle worldRot, float yWorldPos)> state,
+                    ref RefList<(SpriteComponent sprite, Vector2 worldPos, Angle worldRot, Box2 spriteScreenBB)> state,
                     in SpriteComponent value) =>
                 {
                     var entity = value.Owner;
@@ -387,12 +419,10 @@ namespace Robust.Client.Graphics.Clyde
 
                     ref var entry = ref state.AllocAdd();
                     entry.sprite = value;
-                    Vector2 worldPos;
-                    (worldPos, entry.worldRot, entry.matrix) = transform.GetWorldPositionRotationMatrix();
-                    var eyePos = eyeMatrix.Transform(worldPos);
-                    // Didn't use the bounds from the query as that has to be re-calculated (and is probably more expensive than this).
-                    var bounds = value.CalculateBoundingBox(eyePos);
-                    entry.yWorldPos = eyePos.Y - bounds.Extents.Y;
+                    (entry.worldPos, entry.worldRot) = transform.GetWorldPositionRotation();
+
+                    var spriteWorldBB = value.CalculateRotatedBoundingBox(entry.worldPos, entry.worldRot, eye);
+                    entry.spriteScreenBB = worldToLocal.TransformBox(spriteWorldBB);
                     return true;
 
                 }, bounds, true);
@@ -456,6 +486,8 @@ namespace Robust.Client.Graphics.Clyde
                 return;
             }
 
+            using var _ = _prof.Group("Viewport");
+
             RenderInRenderTarget(viewport.RenderTarget, () =>
             {
                 using var _ = DebugGroup($"Viewport: {viewport.Name}");
@@ -477,24 +509,33 @@ namespace Robust.Client.Graphics.Clyde
                 if (_eyeManager.CurrentMap != MapId.Nullspace)
                 {
                     using (DebugGroup("Lights"))
+                    using (_prof.Group("Lights"))
                     {
                         DrawLightsAndFov(viewport, worldBounds, worldAABB, eye);
                     }
 
-                    RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowWorld, worldAABB, worldBounds);
+                    using (_prof.Group("Overlays WSBW"))
+                    {
+                        RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowWorld, worldAABB, worldBounds);
+                    }
 
                     using (DebugGroup("Grids"))
+                    using (_prof.Group("Grids"))
                     {
                         _drawGrids(viewport, worldBounds, eye);
                     }
 
                     // We will also render worldspace overlays here so we can do them under / above entities as necessary
                     using (DebugGroup("Entities"))
+                    using (_prof.Group("Entities"))
                     {
                         DrawEntities(viewport, worldBounds, worldAABB, eye);
                     }
 
-                    RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowFOV, worldAABB, worldBounds);
+                    using (_prof.Group("Overlays WSBFOV"))
+                    {
+                        RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowFOV, worldAABB, worldBounds);
+                    }
 
                     if (_lightManager.Enabled && _lightManager.DrawHardFov && eye.DrawFov)
                     {
@@ -527,7 +568,10 @@ namespace Robust.Client.Graphics.Clyde
                         UIBox2.FromDimensions(Vector2.Zero, viewport.Size), new Color(1, 1, 1, 0.5f));
                 }
 
-                RenderOverlays(viewport, OverlaySpace.WorldSpace, worldAABB, worldBounds);
+                using (_prof.Group("Overlays WS"))
+                {
+                    RenderOverlays(viewport, OverlaySpace.WorldSpace, worldAABB, worldBounds);
+                }
 
                 _currentViewport = oldVp;
             }, viewport.ClearColor);