Version: 219.2.1

* Fix security bug in WritableDirProvider.OpenOsWindow()

Reported by @NarryG and @nyeogmi

* Sandbox updates

* Update ImageSharp again

(cherry picked from commit 7d778248ee)
(cherry picked from commit f66cda74e95619ddba2221bda644bf4394619805)
(cherry picked from commit db8ba83866c523e08e4fba0b80cd954f4f190613)

.editorconfig

@@ -10,5 +10,8 @@ charset = utf-8
 [*.{csproj,xml,yml,dll.config,targets,props}]
 indent_size = 2
 
+[nuget.config]
+indent_size = 2
+
 [*.gdsl]
 indent_style = tab

.github/CODEOWNERS

@@ -1,18 +1,12 @@
 # Last match in file takes precedence.
 
 # Ping for all PRs
-* @Acruid @PJB3005 @ZoldorfTheWizard
+* @PJB3005 @DrSmugleaf
 
-/Robust.Client.NameGenerator @PaulRitter
-/Robust.Client.Injectors @PaulRitter
-/Robust.Generators @PaulRitter
-/Robust.Analyzers @PaulRitter
-/Robust.*/GameStates @PaulRitter
-/Robust.Shared/Analyzers @PaulRitter
-/Robust.*/Serialization @PaulRitter @DrSmugleaf
-/Robust.*/Prototypes @PaulRitter
-/Robust.Shared/GameObjects/ComponentDependencies @PaulRitter
-/Robust.*/Containers @PaulRitter
+# commands commands commands commands
+**/Toolshed/** @moonheart08
+*Command.cs @moonheart08
+*Commands.cs @moonheart08
 
-# Be they Fluent translations or Freemarker templates, I know them both!
-*.ftl @RemieRichards
+# Physics
+**/Robust.Shared/Physics/** @metalgearsloth

.github/workflows/build-docfx.yml

@@ -7,14 +7,14 @@ jobs:
   docfx:
    runs-on: ubuntu-latest
    steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3.6.0
       with:
         submodules: true
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3.2.0
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Install dependencies
       run: dotnet restore

.github/workflows/build-test.yml

@@ -15,19 +15,20 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3.6.0
       with:
         submodules: true
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3.2.0
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build
       run: dotnet build --no-restore /p:WarningsAsErrors=nullable
-    - name: Test Engine
+    - name: Robust.UnitTesting
       run: dotnet test --no-build Robust.UnitTesting/Robust.UnitTesting.csproj -- NUnit.ConsoleOut=0
-
+    - name: Robust.Analyzers.Tests
+      run: dotnet test --no-build Robust.Analyzers.Tests/Robust.Analyzers.Tests.csproj -- NUnit.ConsoleOut=0
 

.github/workflows/codeql-analysis.yml

@@ -35,12 +35,12 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3.6.0
       with:
         submodules: true
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3.2.0
       with:
         dotnet-version: 7.0.x
 

.github/workflows/publish-client.yml

@@ -16,14 +16,14 @@ jobs:
         $ver = [regex]::Match($env:GITHUB_REF, "refs/tags/v?(.+)").Groups[1].Value
         echo ("::set-output name=version::{0}" -f $ver)
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3.6.0
       with:
         submodules: true
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3.2.0
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Package client
       run: Tools/package_client_build.py -p windows mac linux

.github/workflows/test-content.yml

@@ -13,15 +13,15 @@ jobs:
 
     steps:
     - name: Check out content
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3.6.0
       with:
         repository: space-wizards/space-station-14
         submodules: recursive
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v3.2.0
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
     - name: Disable submodule autoupdate
       run: touch BuildChecker/DISABLE_SUBMODULE_AUTOUPDATE
 

Directory.Packages.props

@@ -0,0 +1,64 @@
+<Project>
+  <ItemGroup>
+    <PackageVersion Include="BenchmarkDotNet" Version="0.13.12" />
+    <PackageVersion Include="DiscordRichPresence" Version="1.2.1.24" />
+    <PackageVersion Include="ILReader.Core" Version="1.0.0.4" />
+    <PackageVersion Include="JetBrains.Annotations" Version="2023.3.0" />
+    <PackageVersion Include="JetBrains.Profiler.Api" Version="1.4.0" />
+    <PackageVersion Include="Linguini.Bundle" Version="0.1.3" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Analyzer.Testing" Version="1.1.1"/>
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.NUnit" Version="1.1.1"/>
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="4.8.0" />
+    <PackageVersion Include="Microsoft.CodeCoverage" Version="17.8.0" />
+    <PackageVersion Include="Microsoft.Data.Sqlite.Core" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.DotNet.RemoteExecutor" Version="8.0.0-beta.24059.4" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Logging" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.ObjectPool" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Primitives" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.ILVerification" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.0" />
+    <PackageVersion Include="Microsoft.NET.ILLink.Tasks" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageVersion Include="Microsoft.Win32.Registry" Version="5.0.0" />
+    <PackageVersion Include="Moq" Version="4.20.70" />
+    <PackageVersion Include="NUnit" Version="4.0.1" />
+    <PackageVersion Include="NUnit.Analyzers" Version="3.10.0" />
+    <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />
+    <PackageVersion Include="Nett" Version="0.15.0" />
+    <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.4" />
+    <PackageVersion Include="OpenTK.OpenAL" Version="4.7.7" />
+    <PackageVersion Include="OpenToolkit.Graphics" Version="4.0.0-pre9.1" />
+    <PackageVersion Include="Pidgin" Version="3.2.2" />
+    <PackageVersion Include="Robust.Natives" Version="0.1.1" />
+    <PackageVersion Include="Robust.Natives.Cef" Version="120.1.9" />
+    <PackageVersion Include="Robust.Shared.AuthLib" Version="0.1.2" />
+    <PackageVersion Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.7" />
+    <PackageVersion Include="SQLitePCLRaw.provider.sqlite3" Version="2.1.7" />
+    <PackageVersion Include="Serilog" Version="3.1.1" />
+    <PackageVersion Include="Serilog.Sinks.Loki" Version="4.0.0-beta3" />
+    <PackageVersion Include="SharpZstd.Interop" Version="1.5.2-beta2" />
+    <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.5" />
+    <PackageVersion Include="SpaceWizards.HttpListener" Version="0.1.0" />
+    <PackageVersion Include="SpaceWizards.NFluidsynth" Version="0.1.1" />
+    <PackageVersion Include="SpaceWizards.SharpFont" Version="1.0.2" />
+    <PackageVersion Include="SpaceWizards.Sodium" Version="0.2.1" />
+    <PackageVersion Include="System.Numerics.Vectors" Version="4.5.0" />
+    <PackageVersion Include="System.Memory" Version="4.5.5" />
+    <PackageVersion Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+    <PackageVersion Include="TerraFX.Interop.Windows" Version="10.0.22621.5" />
+    <PackageVersion Include="TerraFX.Interop.Xlib" Version="6.4.0" />
+    <PackageVersion Include="VorbisPizza" Version="1.3.0" />
+    <PackageVersion Include="YamlDotNet" Version="13.7.1" />
+    <PackageVersion Include="prometheus-net" Version="8.2.1" />
+    <PackageVersion Include="prometheus-net.DotNetRuntime" Version="4.4.0" />
+    <PackageVersion Include="PolySharp" Version="1.14.1" />
+  </ItemGroup>
+</Project>

Lidgren.Network/CursedHorrorsBeyondOurWildestImagination.cs

@@ -0,0 +1,9 @@
+using System.Runtime.CompilerServices;
+
+// So I wanted to mess with NetIncomingMessage and NetOutgoingMessage from tests.
+// Now.. the instructors are internal...
+// Unless...
+// I mean we have this project here from the weird way we're compiling Lidgren.
+// I could just put this in here... it wouldn't touch the main Lidgren repo at all...
+[assembly: InternalsVisibleTo("Robust.UnitTesting")]
+

Lidgren.Network/Lidgren.Network.csproj

@@ -10,9 +10,14 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 
     <SkipRobustAnalyzer>true</SkipRobustAnalyzer>
+
+    <Nullable>enable</Nullable>
+    <LangVersion>12.0</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
+    <Compile Include="CursedHorrorsBeyondOurWildestImagination.cs" />
+
     <Compile Include="Lidgren.Network\Lidgren.Network\**\*.cs">
      <Link>%(RecursiveDir)%(Filename)%(Extension)</Link>
     </Compile>

MSBuild/Robust.DefineConstants.targets

@@ -23,7 +23,7 @@
   <PropertyGroup Condition="'$(FullRelease)' != 'True'">
     <DefineConstants>$(DefineConstants);DEVELOPMENT</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)' == 'Release'">
+  <PropertyGroup Condition="'$(Configuration)' == 'Release' Or '$(Configuration)' == 'Tools'">
     <DefineConstants>$(DefineConstants);EXCEPTION_TOLERANCE</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(EnableClientScripting)' == 'True'">

MSBuild/Robust.Engine.Version.props

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

MSBuild/Robust.Engine.props

@@ -1,8 +1,8 @@
 <Project>
     <!-- Engine-specific properties. Content should not use this file. -->
     <PropertyGroup>
-        <TargetFramework>net7.0</TargetFramework>
-        <LangVersion>11</LangVersion>
+        <TargetFramework>net8.0</TargetFramework>
+        <LangVersion>12</LangVersion>
         <Nullable>enable</Nullable>
         <WarningsAsErrors>nullable</WarningsAsErrors>
     </PropertyGroup>

MSBuild/Robust.Properties.targets

@@ -3,7 +3,8 @@
   <!-- Import this at the end of any project files in Robust and Content. -->
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
 
   <Import Project="Robust.Custom.targets" Condition="Exists('Robust.Custom.targets')"/>
@@ -25,4 +26,7 @@
 
   <!-- analyzer -->
   <Import Project="Robust.Analyzers.targets" Condition="'$(SkipRobustAnalyzer)' != 'true'" />
+
+  <!-- serialization generator -->
+  <Import Project="Robust.Serialization.Generator.targets" Condition="'$(SkipRobustAnalyzer)' != 'true'" />
 </Project>

MSBuild/Robust.Serialization.Generator.targets

@@ -0,0 +1,5 @@
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="12.0">
+  <ItemGroup>
+    <ProjectReference Include="$(MSBuildThisFileDirectory)\..\Robust.Serialization.Generator\Robust.Serialization.Generator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false"/>
+  </ItemGroup>
+</Project>

MSBuild/XamlIL.targets

@@ -24,12 +24,16 @@
     <RobustInjectorsConfiguration>$(Configuration)</RobustInjectorsConfiguration>
     <RobustInjectorsConfiguration Condition="'$(Configuration)' == 'DebugOpt'">Debug</RobustInjectorsConfiguration>
     <RobustInjectorsConfiguration Condition="'$(Configuration)' == 'Tools'">Release</RobustInjectorsConfiguration>
+    <RobustInjectorsConfiguration Condition="'$(UseArtifactsOutput)' == 'true' And '$(RuntimeIdentifier)' != ''">$(RobustInjectorsConfiguration)_$(RuntimeIdentifier)</RobustInjectorsConfiguration>
+    <RobustInjectorsConfiguration Condition="'$(UseArtifactsOutput)' == 'true'">$(RobustInjectorsConfiguration.ToLower())</RobustInjectorsConfiguration>
+    <CompileRobustXamlTaskAssemblyFile Condition="'$(UseArtifactsOutput)' != 'true'">$(MSBuildThisFileDirectory)\..\Robust.Client.Injectors\bin\$(RobustInjectorsConfiguration)\netstandard2.0\Robust.Client.Injectors.dll</CompileRobustXamlTaskAssemblyFile>
+    <CompileRobustXamlTaskAssemblyFile Condition="'$(UseArtifactsOutput)' == 'true'">$(MSBuildThisFileDirectory)\..\..\artifacts\bin\Robust.Client.Injectors\$(RobustInjectorsConfiguration)\Robust.Client.Injectors.dll</CompileRobustXamlTaskAssemblyFile>
   </PropertyGroup>
 
   <UsingTask
     Condition="'$(_RobustUseExternalMSBuild)' != 'true' And $(DesignTimeBuild) != true"
     TaskName="CompileRobustXamlTask"
-    AssemblyFile="$(MSBuildThisFileDirectory)\..\Robust.Client.Injectors\bin\$(RobustInjectorsConfiguration)\netstandard2.0\Robust.Client.Injectors.dll"/>
+    AssemblyFile="$(CompileRobustXamlTaskAssemblyFile)"/>
   <Target
     Name="CompileRobustXaml"
     Condition="Exists('@(IntermediateAssembly)')"

OpenToolkit.GraphicsLibraryFramework/GLFWException.cs

@@ -61,18 +61,5 @@ namespace OpenToolkit.GraphicsLibraryFramework
             : base(message, innerException)
         {
         }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="GLFWException"/> class with the specified context
-        /// and the serialization information.
-        /// </summary>
-        /// <param name="info">The <see cref="SerializationInfo"/> associated with this exception.</param>
-        /// <param name="context">
-        /// A <see cref="StreamingContext"/> that represents the context of this exception.
-        /// </param>
-        protected GLFWException(SerializationInfo info, StreamingContext context)
-            : base(info, context)
-        {
-        }
     }
 }

Resources/EnginePrototypes/Audio/audio_entities.yml

@@ -0,0 +1,5 @@
+- type: entity
+  id: Audio
+  name: Audio
+  description: Audio entity used by engine
+  save: false

Resources/EnginePrototypes/Debug/rotation.yml

@@ -1,7 +1,7 @@
 - type: entity
   id: debugRotation
   abstract: true
-  suffix: DEBUG
+  categories: [ debug ]
   components:
   - type: Sprite
     netsync: false

Resources/EnginePrototypes/Shaders/stockshaders.yml

@@ -12,3 +12,8 @@
   id: bgra
   kind: source
   path: "/Shaders/Internal/bgra.swsl"
+
+- type: shader
+  id: ColorPicker
+  kind: source
+  path: "/Shaders/color_picker.swsl"

Resources/EnginePrototypes/UserInterface/uiThemes.yml

@@ -1,6 +1,6 @@
 - type: uiTheme
   id: Default
-  path: /Textures/Interface/Default
+  path: /Textures/Interface/Default/
   colors:
     # Root
     rootBackground: "#000000"

Resources/EnginePrototypes/entityCategory.yml

@@ -0,0 +1,17 @@
+# debug related entities
+- type: entityCategory
+  id: debug
+  name: entity-category-name-debug
+  description: entity-category-desc-debug
+
+# entities that spawn other entities
+- type: entityCategory
+  id: spawner
+  name: entity-category-name-spawner
+  description: entity-category-desc-spawner
+
+# entities that should be hidden from the spawn menu
+- type: entityCategory
+  id: hideSpawnMenu
+  name: entity-category-name-hide
+  description: entity-category-desc-hide

Resources/Locale/en-US/commands.ftl

@@ -9,7 +9,9 @@ cmd-parse-failure-float = {$arg} is not a valid float.
 cmd-parse-failure-bool = {$arg} is not a valid bool.
 cmd-parse-failure-uid = {$arg} is not a valid entity UID.
 cmd-parse-failure-mapid = {$arg} is not a valid MapId.
+cmd-parse-failure-grid = {$arg} is not a valid grid.
 cmd-parse-failure-entity-exist = UID {$arg} does not correspond to an existing entity.
+cmd-parse-failure-session = There is no session with username: {$username}
 
 cmd-error-file-not-found = Could not find file: {$file}.
 cmd-error-dir-not-found = Could not find directory: {$dir}.
@@ -489,7 +491,7 @@ cmd-net_entityreport-help = Usage: net_entityreport
 cmd-net_refresh-desc = Requests a full server state.
 cmd-net_refresh-help = Usage: net_refresh
 
-cmd-net_graph-desc = Toggles the net statistics pannel.
+cmd-net_graph-desc = Toggles the net statistics panel.
 cmd-net_graph-help = Usage: net_graph
 
 cmd-net_watchent-desc = Dumps all network updates for an EntityId to the console.
@@ -558,3 +560,16 @@ cmd-vfs_ls-help = Usage: vfs_list <path>
 
 cmd-vfs_ls-err-args = Need exactly 1 argument.
 cmd-vfs_ls-hint-path = <path>
+
+cmd-reloadtiletextures-desc = Reloads the tile texture atlas to allow hot reloading tile sprites
+cmd-reloadtiletextures-help = Usage: reloadtiletextures
+
+cmd-audio_length-desc = Shows the length of an audio file
+cmd-audio_length-help = Usage: audio_length { cmd-audio_length-arg-file-name }
+cmd-audio_length-arg-file-name = <file name>
+
+## PVS
+cmd-pvs-override-info-desc = Prints information about any PVS overrides associated with an entity.
+cmd-pvs-override-info-empty = Entity {$nuid} has no PVS overrides.
+cmd-pvs-override-info-global = Entity {$nuid} has a global override.
+cmd-pvs-override-info-clients = Entity {$nuid} has a session override for {$clients}.

Resources/Locale/en-US/discordRPC.ftl

@@ -1,4 +1,5 @@
 discord-rpc-in-main-menu = In Main Menu
+discord-rpc-in-main-menu-logo-text = I think coolsville SUCKS
 discord-rpc-character = Username: {$username}
 discord-rpc-on-server = On Server: {$servername}
-discord-rpc-players = Players: {$players}/{$maxplayers}
+discord-rpc-players = Players: {$players}/{$maxplayers}

Resources/Locale/en-US/entity-category.ftl

@@ -0,0 +1,8 @@
+entity-category-name-debug = Debug
+entity-category-desc-debug = Entity prototypes intended for debugging & testing.
+
+entity-category-name-spawner = Spawner
+entity-category-desc-spawner = Entity prototypes that spawn other entities.
+
+entity-category-name-hide = Hidden
+entity-category-desc-hide = Entity prototypes that should be hidden from the spawn menu

Resources/Locale/en-US/input.ftl

@@ -18,6 +18,15 @@ input-key-F12 = F12
 input-key-F13 = F13
 input-key-F14 = F14
 input-key-F15 = F15
+input-key-F16 = F16
+input-key-F17 = F17
+input-key-F18 = F18
+input-key-F19 = F19
+input-key-F20 = F20
+input-key-F21 = F21
+input-key-F22 = F22
+input-key-F23 = F23
+input-key-F24 = F24
 input-key-Pause = Pause
 input-key-Left = Left
 input-key-Up = Up

Resources/Locale/en-US/physics/grid_merging.ftl

@@ -0,0 +1,8 @@
+cmd-merge_grids-desc = Combines 2 grids into 1 grid
+cmd-merge_grids-help = merge_grids <gridUid1> <gridUid2> <offsetX> <offsetY> [angle]
+
+cmd-merge_grids-hintA = Grid A
+cmd-merge_grids-hintB = Grid B
+cmd-merge_grids-xOffset = X offset
+cmd-merge_grids-yOffset = Y offset
+cmd-merge_grids-angle = [Angle]

Resources/Locale/en-US/replays.ftl

@@ -22,7 +22,7 @@ cmd-replay-skip-hint = Ticks or timespan (HH:MM:SS).
 
 cmd-replay-set-time-desc = Jump forwards or backwards to some specific time.
 cmd-replay-set-time-help = replay_set <tick or time>
-cmd-replay-set-time-hint = Tick or timespan (HH:MM:SS), starting from 
+cmd-replay-set-time-hint = Tick or timespan (HH:MM:SS), starting from
 
 cmd-replay-error-time = "{$time}" is not an integer or timespan.
 cmd-replay-error-args = Wrong number of arguments.
@@ -33,7 +33,7 @@ cmd-replay-error-run-level = You cannot load a replay while connected to a serve
 # Recording commands
 
 cmd-replay-recording-start-desc = Starts a replay recording, optionally with some time limit.
-cmd-replay-recording-start-help = Usage: replay_recording_start [name] [overwrite] [time limit] 
+cmd-replay-recording-start-help = Usage: replay_recording_start [name] [overwrite] [time limit]
 cmd-replay-recording-start-success = Started recording a replay.
 cmd-replay-recording-start-already-recording = Already recording a replay.
 cmd-replay-recording-start-error = An error occurred while trying to start the recording.
@@ -48,7 +48,7 @@ cmd-replay-recording-stop-not-recording = Not currently recording a replay.
 
 cmd-replay-recording-stats-desc = Displays information about the current replay recording.
 cmd-replay-recording-stats-help = Usage: replay_recording_stats
-cmd-replay-recording-stats-result = Duration: {$time} min, Ticks: {$ticks}, Size: {$size} mb, rate: {$rate} mb/min.
+cmd-replay-recording-stats-result = Duration: {$time} min, Ticks: {$ticks}, Size: {$size} MB, rate: {$rate} MB/min.
 
 
 # Time Control UI
@@ -56,4 +56,4 @@ replay-time-box-scrubbing-label = Dynamic Scrubbing
 replay-time-box-replay-time-label = Recording Time: {$current} / {$end}  ({$percentage}%)
 replay-time-box-server-time-label = Server Time: {$current} / {$end}
 replay-time-box-index-label = Index: {$current} / {$total}
-replay-time-box-tick-label = Tick: {$current} / {$total}
+replay-time-box-tick-label = Tick: {$current} / {$total}

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

@@ -0,0 +1,423 @@
+command-description-tpto =
+    Teleport the given entities to some target entity.
+command-description-player-list =
+    Returns a list of all player sessions.
+command-description-player-self =
+    Returns the current player session.
+command-description-player-imm =
+    Returns the session associated with the player given as argument.
+command-description-player-entity =
+    Returns the entities of the input sessions.
+command-description-self =
+    Returns the current attached entity.
+command-description-physics-velocity =
+    Returns the velocity of the input entities.
+command-description-physics-angular-velocity =
+    Returns the angular velocity of the input entities.
+command-description-buildinfo =
+    Provides information about the build of the game.
+command-description-cmd-list =
+    Returns a list of all commands, for this side.
+command-description-explain =
+    Explains the given expression, providing command descriptions and signatures.
+command-description-search =
+    Searches through the input for the provided value.
+command-description-stopwatch =
+    Measures the execution time of the given expression.
+command-description-types-consumers =
+    Provides all commands that can consume the given type.
+command-description-types-tree =
+    Debug tool to return all types the command interpreter can downcast the input to.
+command-description-types-gettype =
+    Returns the type of the input.
+command-description-types-fullname =
+    Returns the full name of the input type according to CoreCLR.
+command-description-as =
+    Casts the input to the given type.
+    Effectively a type hint if you know the type but the interpreter does not.
+command-description-count =
+    Counts the amount of entries in it's input, returning an integer.
+command-description-map =
+    Maps the input over the given block, with the provided expected return type.
+    This command may be modified to not need an explicit return type in the future.
+command-description-select =
+    Selects N objects or N% of objects from the input.
+    One can additionally invert this command with not to make it select everything except N objects instead.
+command-description-comp =
+    Returns the given component from the input entities, discarding entities without that component.
+command-description-delete =
+    Deletes the input entities.
+command-description-ent =
+    Returns the provided entity ID.
+command-description-entities =
+    Returns all entities on the server.
+command-description-paused =
+    Filters the input entities by whether or not they are paused.
+    This command can be inverted with not.
+command-description-with =
+    Filters the input entities by whether or not they have the given component.
+    This command can be inverted with not.
+command-description-fuck =
+    Throws an exception.
+command-description-ecscomp-listty =
+    Lists every type of component registered.
+command-description-cd =
+    Changes the session's current directory to the given relative or absolute path.
+command-description-ls-here =
+    Lists the contents of the current directory.
+command-description-ls-in =
+    Lists the contents of the given relative or absolute path.
+command-description-methods-get =
+    Returns all methods associated with the input type.
+command-description-methods-overrides =
+    Returns all methods overridden on the input type.
+command-description-methods-overridesfrom =
+    Returns all methods overridden from the given type on the input type.
+command-description-cmd-moo =
+    Asks the important questions.
+command-description-cmd-descloc =
+    Returns the localization string for a command's description.
+command-description-cmd-getshim =
+    Returns a command's execution shim.
+command-description-help =
+    Provides a quick rundown of how to use toolshed.
+command-description-ioc-registered =
+    Returns all the types registered with IoCManager on the current thread (usually the game thread)
+command-description-ioc-get =
+    Gets an instance of an IoC registration.
+command-description-loc-tryloc =
+    Tries to get a localization string, returning null if unable.
+command-description-loc-loc =
+    Gets a localization string, returning the unlocalized string if unable.
+command-description-physics-angular_velocity =
+    Returns the angular velocity of the given entities.
+command-description-vars =
+    Provides a list of all variables set in this session.
+command-description-any =
+    Returns true if there's any values in the input, otherwise false.
+command-description-ArrowCommand =
+    Assigns the input to a variable.
+command-description-isempty =
+    Returns true if the input is empty, otherwise false.
+command-description-isnull =
+    Returns true if the input is null, otherwise false.
+command-description-unique =
+    Filters the input sequence for uniqueness, removing duplicate values.
+command-description-where =
+    Given some input sequence IEnumerable<T>, takes a block of signature T -> bool that decides if each input value should be included in the output sequence.
+command-description-do =
+    Backwards compatibility with BQL, applies the given old commands over the input sequence.
+command-description-named =
+    Filters the input entities by their name, with the regex ^selector$.
+command-description-prototyped =
+    Filters the input entities by their prototype.
+command-description-nearby =
+    Creates a new list of all entities nearby the inputs within the given range.
+command-description-first =
+    Returns the first entry of the given enumerable.
+command-description-splat =
+    "Splats" a block, value, or variable, creating N copies of it in a list.
+command-description-val =
+    Casts the given value, block, or variable to the given type. This is mostly a workaround for current limitations of variables.
+command-description-actor-controlled =
+    Filters entities by whether or not they're actively controlled.
+command-description-actor-session =
+    Returns the sessions associated with the input entities.
+command-description-physics-parent =
+    Returns the parent(s) of the input entities.
+command-description-emplace =
+    Runs the given block over it's inputs, with the input value placed into the variable $value within the block.
+    Additionally breaks out $wx, $wy, $proto, $desc, $name, and $paused for entities.
+    Can also have breakout values for other types, consult the documentation for that type for further info.
+command-description-AddCommand =
+    Performs numeric addition.
+command-description-SubtractCommand =
+    Performs numeric subtraction.
+command-description-MultiplyCommand =
+    Performs numeric multiplication.
+command-description-DivideCommand =
+    Performs numeric division.
+command-description-min =
+    Returns the minimum of two values.
+command-description-max =
+    Returns the maximum of two values.
+command-description-BitAndCommand =
+    Performs bitwise AND.
+command-description-BitOrCommand =
+    Performs bitwise OR.
+command-description-BitXorCommand =
+    Performs bitwise XOR.
+command-description-neg =
+    Negates the input.
+command-description-GreaterThanCommand =
+    Performs a greater-than comparison, x > y.
+command-description-LessThanCommand =
+    Performs a less-than comparison, x < y.
+command-description-GreaterThanOrEqualCommand =
+    Performs a greater-than-or-equal comparison, x >= y.
+command-description-LessThanOrEqualCommand =
+    Performs a less-than-or-equal comparison, x <= y.
+command-description-EqualCommand =
+    Performs an equality comparison, returning true if the inputs are equal.
+command-description-NotEqualCommand =
+    Performs an equality comparison, returning true if the inputs are not equal.
+command-description-append =
+    Appends a value to the input enumerable.
+command-description-DefaultIfNullCommand =
+    Replaces the input with the type's default value if it is null, albeit only for value types (not objects).
+command-description-OrValueCommand =
+    If the input is null, uses the provided alternate value.
+command-description-DebugPrintCommand =
+    Prints the given value transparently, for debug prints in a command run.
+command-description-i =
+    Integer constant.
+command-description-f =
+    Float constant.
+command-description-s =
+    String constant.
+command-description-b =
+    Bool constant.
+command-description-join =
+    Joins two sequences together into one sequence.
+command-description-reduce =
+    Given a block to use as a reducer, turns a sequence into a single value.
+    The left hand side of the block is implied, and the right hand is stored in $value.
+command-description-rep =
+    Repeats the input value N times to form a sequence.
+command-description-take =
+    Takes N values from the input sequence
+command-description-spawn-at =
+    Spawns an entity at the given coordinates.
+command-description-spawn-on =
+    Spawns an entity on the given entity, at it's coordinates.
+command-description-spawn-attached =
+    Spawns an entity attached to the given entity, at (0 0) relative to it.
+command-description-mappos =
+    Returns an entity's coordinates relative to it's current map.
+command-description-pos =
+    Returns an entity's coordinates.
+command-description-tp-coords =
+    Teleports the target to the given coordinates.
+command-description-tp-to =
+    Teleports the target to the given other entity.
+command-description-tp-into =
+    Teleports the target "into" the given other entity, attaching it at (0 0) relative to it.
+command-description-comp-get =
+    Gets the given component from the given entity.
+command-description-comp-add =
+    Adds the given component to the given entity.
+command-description-comp-ensure =
+    Ensures the given entity has the given component.
+command-description-comp-has =
+    Check if the given entity has the given component.
+command-description-AddVecCommand =
+    Adds a scalar (single value) to every element in the input.
+command-description-SubVecCommand =
+    Subtracts a scalar (single value) from every element in the input.
+command-description-MulVecCommand =
+    Multiplies a scalar (single value) by every element in the input.
+command-description-DivVecCommand =
+    Divides every element in the input by a scalar (single value).
+command-description-rng-to =
+    Returns a number from its input to its argument (i.e. n..m inclusive)
+command-description-rng-from =
+    Returns a number to its input from its argument (i.e. m..n inclusive)
+command-description-rng-prob =
+    Returns a boolean based on the input probability/chance (from 0 to 1)
+command-description-sum =
+    Computes the sum of the input.
+command-description-bin =
+    "Bins" the input, counting up how many times each unique element occurs.
+command-description-extremes =
+    Returns the two extreme ends of a list, interwoven.
+command-description-sortby =
+    Sorts the input least to greatest by the computed key.
+command-description-sortmapby =
+    Sorts the input least to greatest by the computed key, replacing the value with it's computed key afterward.
+command-description-sort =
+    Sorts the input least to greatest.
+command-description-sortdownby =
+    Sorts the input greatest to least by the computed key.
+command-description-sortmapdownby =
+    Sorts the input greatest to least by the computed key, replacing the value with it's computed key afterward.
+command-description-sortdown =
+    Sorts the input greatest to least.
+command-description-iota =
+    Returns a list of numbers 1 to N.
+command-description-to =
+    Returns a list of numbers N to M.
+command-description-curtick =
+    The current game tick.
+command-description-curtime =
+    The current game time (a TimeSpan)
+command-description-realtime =
+    The current realtime since startup (a TimeSpan)
+command-description-servertime =
+    The current server game time, or zero if we are the server (a TimeSpan)
+command-description-replace =
+    Replaces the input entities with the given prototype, preserving position and rotation (but nothing else)
+command-description-allcomps =
+    Returns all components on the given entity.
+command-description-entitysystemupdateorder-tick =
+    Lists the tick update order of entity systems.
+command-description-entitysystemupdateorder-frame =
+    Lists the frame update order of entity systems.
+command-description-more =
+    Prints the contents of $more, i.e. any extras that Toolshed didn't print from the last command.
+command-description-ModulusCommand =
+    Computes the modulus of two values.
+    This is usually remainder, check C#'s documentation for the type.
+command-description-ModVecCommand =
+    Performs the modulus operation over the input with the given constant right-hand value.
+command-description-BitAndNotCommand =
+    Performs bitwise AND-NOT over the input.
+command-description-BitOrNotCommand =
+    Performs bitwise OR-NOT over the input.
+command-description-BitXnorCommand =
+    Performs bitwise XNOR over the input.
+command-description-BitNotCommand =
+    Performs bitwise NOT on the input.
+command-description-abs =
+    Computes the absolute value of the input (removing the sign)
+command-description-average =
+    Computes the average (arithmetic mean) of the input.
+command-description-bibytecount =
+    Returns the size of the input in bytes, given that the input implements IBinaryInteger.
+    This is NOT sizeof.
+command-description-shortestbitlength =
+    Returns the minimum number of bits needed to represent the input value.
+command-description-countleadzeros =
+    Counts the number of leading binary zeros in the input value.
+command-description-counttrailingzeros =
+    Counts the number of trailing binary zeros in the input value.
+command-description-fpi =
+    pi (3.14159...) as a float.
+command-description-fe =
+    e (2.71828...) as a float.
+command-description-ftau =
+    tau (6.28318...) as a float.
+command-description-fepsilon =
+    The epsilon value for a float, exactly 1.4e-45.
+command-description-dpi =
+    pi (3.14159...) as a double.
+command-description-de =
+    e (2.71828...) as a double.
+command-description-dtau =
+    tau (6.28318...) as a double.
+command-description-depsilon =
+    The epsilon value for a double, exactly 4.9406564584124654E-324.
+command-description-hpi =
+    pi (3.14...) as a half.
+command-description-he =
+    e (2.71...) as a half.
+command-description-htau =
+    tau (6.28...) as a half.
+command-description-hepsilon =
+    The epsilon value for a half, exactly 5.9604645E-08.
+command-description-floor =
+    Returns the floor of the input value (rounding toward zero).
+command-description-ceil =
+    Returns the ceil of the input value (rounding away from zero).
+command-description-round =
+    Rounds the input value.
+command-description-trunc =
+    Truncates the input value.
+command-description-round2frac =
+    Rounds the input value to the specified number of fractional digits.
+command-description-exponentbytecount =
+    Returns the number of bytes required to store the exponent.
+command-description-significandbytecount =
+    Returns the number of bytes required to store the significand.
+command-description-significandbitcount =
+    Returns the exact bit length of the significand.
+command-description-exponentshortestbitcount =
+    Returns the minimum number of bits to store the exponent.
+command-description-stepnext =
+    Steps to the next float value, adding one to the significand with carry.
+command-description-stepprev =
+    Steps to the previous float value, subtracting one from the significand with carry.
+command-description-checkedto =
+    Converts from the input numeric type to the target, erroring if not possible.
+command-description-saturateto =
+    Converts from the input numeric type to the target, saturating if the value is out of range.
+    For example, converting 382 to a byte would saturate to 255 (the maximum value of a byte).
+command-description-truncto =
+    Converts from the input numeric type to the target, with truncation.
+    In the case of integers, this is a bit cast with sign extension.
+command-description-iscanonical =
+    Returns whether the input is in canonical form.
+command-description-iscomplex =
+    Returns whether the input is a complex number (by value, not by type)
+command-description-iseven =
+    Returns whether the input is even.
+    Not a javascript package.
+command-description-isodd =
+    Returns whether the input is odd.
+command-description-isfinite =
+    Returns whether the input is finite.
+command-description-isimaginary =
+    Returns whether the input is purely imaginary (no real part).
+command-description-isinfinite =
+    Returns whether the input is infinite.
+command-description-isinteger =
+    Returns whether the input is an integer (by value, not by type)
+command-description-isnan =
+    Returns whether the input is Not a Number (NaN).
+    This is a special floating point value, so this is by value, not by type.
+command-description-isnegative =
+    Returns whether the input is negative.
+command-description-ispositive =
+    Returns whether the input is positive.
+command-description-isreal =
+    Returns whether the input is purely real (no imaginary part).
+command-description-issubnormal =
+    Returns whether the input is in sub-normal form.
+command-description-iszero =
+    Returns whether the input is zero.
+command-description-pow =
+    Computes the power of its lefthand to its righthand. x^y.
+command-description-sqrt =
+    Computes the square root of its input.
+command-description-cbrt =
+    Computes the cube root of its input.
+command-description-root =
+    Computes the Nth root of its input.
+command-description-hypot =
+    Computes the hypotenuse of a triangle with the given sides A and B.
+command-description-sin =
+    Computes the sine of the input.
+command-description-sinpi =
+    Computes the sine of the input multiplied by pi.
+command-description-asin =
+    Computes the arcsine of the input.
+command-description-asinpi =
+    Computes the arcsine of the input multiplied by pi.
+command-description-cos =
+    Computes the cosine of the input.
+command-description-cospi =
+    Computes the cosine of the input multiplied by pi.
+command-description-acos =
+    Computes the arcosine of the input.
+command-description-acospi =
+    Computes the arcosine of the input multiplied by pi.
+command-description-tan =
+    Computes the tangent of the input.
+command-description-tanpi =
+    Computes the tangent of the input multiplied by pi.
+command-description-atan =
+    Computes the arctangent of the input.
+command-description-atanpi =
+    Computes the arctangent of the input multiplied by pi.
+command-description-iterate =
+    Iterates the given function over the input N times, returning a list of results.
+    Think of this like successively applying the function to a value, tracking all the intermediate values.
+command-description-pick =
+    Picks a random value from the input.
+command-description-tee =
+    Tees the input into the given block, ignoring the block's result.
+    This essentially lets you have a branch in your code to do multiple operations on one value.
+command-description-cmd-info =
+    Returns a CommandSpec for the given command.
+    On its own, this means it'll print the command's help message.
+command-description-comp-rm =
+    Removes the given component from the entity.

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

@@ -1,5 +1,6 @@
 ## ViewVariablesInstanceEntity
 
+view-variables = View Variables
 view-variable-instance-entity-server-components-add-component-button-placeholder = Add Component
 view-variable-instance-entity-client-variables-tab-title = Client Variables
 view-variable-instance-entity-client-components-tab-title = Client Components
@@ -8,4 +9,19 @@ view-variable-instance-entity-server-components-tab-title = Server Components
 view-variable-instance-entity-client-components-search-bar-placeholder = Search
 view-variable-instance-entity-server-components-search-bar-placeholder = Search
 view-variable-instance-entity-add-window-server-components = Add Component [S]
-view-variable-instance-entity-add-window-client-components = Add Component [C]
+view-variable-instance-entity-add-window-client-components = Add Component [C]
+
+
+## SoundSpecifier
+vv-sound-none = None
+vv-sound-path = Path
+vv-sound-collection = Collection
+
+vv-sound-volume = volume
+vv-sound-pitch = Pitch
+vv-sound-max-distance = Max Distance
+vv-sound-rolloff-factor = Rolloff Factor
+vv-sound-reference-distance = Reference Distance
+vv-sound-loop = Loop
+vv-sound-play-offset = Play Offset (s)
+vv-sound-variation = Pitch variation

Resources/Shaders/color_picker.swsl

@@ -0,0 +1,46 @@
+// Simple shader for creating a box with colours varying along the x and y axes.
+
+uniform highp vec2 size;
+uniform highp vec2 offset;
+
+uniform highp vec4 xAxis;
+uniform highp vec4 yAxis;
+uniform highp vec4 baseColor;
+
+uniform bool hsv;
+
+void fragment() 
+{
+    // Calculate local uv coordinates.
+    // I.e., if using this shader to draw a box to the screen, (0,0) is the bottom left of the box.
+    
+    highp float yCoords = 1.0/SCREEN_PIXEL_SIZE.y - FRAGCOORD.y;
+    highp vec2 uv = vec2(FRAGCOORD.x - offset.x,  yCoords - offset.y);
+    uv /= size;
+    uv.y = 1.0 - uv.y;
+    
+    highp vec4 modulate = baseColor + uv.x * xAxis + uv.y * yAxis;
+    
+    if (hsv)
+    {
+        modulate.xyz = hsv2rgb(modulate.xyz);
+    }
+    
+    // The UV used for the texture lookup is the TEXTURE UV coordinate, which is different from the coordinates computed above.
+	COLOR = zTexture(UV) * modulate;
+}
+
+
+// hsv to RGB conversion taken from www.shadertoy.com/view/MsS3Wc
+
+// The MIT License
+// Copyright © 2014 Inigo Quilez
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+// https://www.youtube.com/c/InigoQuilez
+// https://iquilezles.org
+
+highp vec3 hsv2rgb( in highp vec3 c )
+{
+    highp vec3 rgb = clamp( abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),6.0)-3.0)-1.0, 0.0, 1.0 );
+	return c.z * mix( vec3(1.0), rgb, c.y);
+}

Robust.Analyzers.Tests/AccessAnalyzer_Test.cs

@@ -20,11 +20,16 @@ public sealed class AccessAnalyzer_Test
         {
             TestState =
             {
-                AdditionalReferences = { typeof(AccessAnalyzer).Assembly },
                 Sources = { code }
             },
         };
 
+        TestHelper.AddEmbeddedSources(
+            test.TestState,
+            "Robust.Shared.Analyzers.AccessAttribute.cs",
+            "Robust.Shared.Analyzers.AccessPermissions.cs"
+        );
+
         // ExpectedDiagnostics cannot be set, so we need to AddRange here...
         test.TestState.ExpectedDiagnostics.AddRange(expected);
 

Robust.Analyzers.Tests/Aliases.cs

@@ -0,0 +1,8 @@
+// OH BOY. TURNS OUT IT GETS EVEN MORE CURSED.
+//
+// So because we're compiling a copy of Robust.Roslyn.Shared into every analyzer project,
+// the test project sees multiple copies of it. This would make it impossible to use.
+// UNLESS you use this obscure C# feature called "extern alias"
+// that I guarantee you you've never heard of before, and are now concerned about.
+
+extern alias SerializationGenerator;

Robust.Analyzers.Tests/ComponentPauseGeneratorTest.cs

@@ -0,0 +1,340 @@
+extern alias SerializationGenerator;
+using System.Linq;
+using System.Reflection;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.Text;
+using NUnit.Framework;
+using SerializationGenerator::Robust.Roslyn.Shared;
+using SerializationGenerator::Robust.Serialization.Generator;
+
+namespace Robust.Analyzers.Tests;
+
+[TestFixture]
+[TestOf(typeof(ComponentPauseGenerator))]
+[Parallelizable(ParallelScope.All)]
+public sealed class ComponentPauseGeneratorTest
+{
+    private const string TypesCode = """
+        global using System;
+        global using Robust.Shared.Analyzers;
+        global using Robust.Shared.GameObjects;
+
+        namespace Robust.Shared.Analyzers
+        {
+            [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+            public sealed class AutoGenerateComponentPauseAttribute : Attribute
+            {
+                public bool Dirty = false;
+            }
+
+            [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
+            public sealed class AutoPausedFieldAttribute : Attribute;
+
+            [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
+            public sealed class AutoNetworkedFieldAttribute : Attribute
+            {
+            }
+        }
+
+        namespace Robust.Shared.GameObjects
+        {
+            public interface IComponent;
+        }
+        """;
+
+    [Test]
+    public void TestBasic()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField]
+                public TimeSpan Foo;
+            }
+            """);
+
+        ExpectNoDiagnostics(result);
+        ExpectSource(
+            result,
+            """
+            // <auto-generated />
+
+            using Robust.Shared.GameObjects;
+
+            public partial class FooComponent
+            {
+            [RobustAutoGenerated]
+            public sealed class FooComponent_AutoPauseSystem : EntitySystem
+            {
+                public override void Initialize()
+                {
+                    SubscribeLocalEvent<FooComponent, EntityUnpausedEvent>(OnEntityUnpaused);
+                }
+
+                private void OnEntityUnpaused(EntityUid uid, FooComponent component, ref EntityUnpausedEvent args)
+                {
+                    component.Foo += args.PausedTime;
+                }
+            }
+            }
+
+            """);
+    }
+
+    [Test]
+    public void TestNullable()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField]
+                public TimeSpan? Foo;
+            }
+            """);
+
+        ExpectNoDiagnostics(result);
+        ExpectSource(
+            result,
+            """
+            // <auto-generated />
+
+            using Robust.Shared.GameObjects;
+
+            public partial class FooComponent
+            {
+            [RobustAutoGenerated]
+            public sealed class FooComponent_AutoPauseSystem : EntitySystem
+            {
+                public override void Initialize()
+                {
+                    SubscribeLocalEvent<FooComponent, EntityUnpausedEvent>(OnEntityUnpaused);
+                }
+
+                private void OnEntityUnpaused(EntityUid uid, FooComponent component, ref EntityUnpausedEvent args)
+                {
+                    if (component.Foo.HasValue)
+                        component.Foo = component.Foo.Value + args.PausedTime;
+                }
+            }
+            }
+
+            """);
+    }
+
+    [Test]
+    public void TestAutoState()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField, AutoNetworkedField]
+                public TimeSpan Foo;
+            }
+            """);
+
+        ExpectNoDiagnostics(result);
+        ExpectSource(
+            result,
+            """
+            // <auto-generated />
+
+            using Robust.Shared.GameObjects;
+
+            public partial class FooComponent
+            {
+            [RobustAutoGenerated]
+            public sealed class FooComponent_AutoPauseSystem : EntitySystem
+            {
+                public override void Initialize()
+                {
+                    SubscribeLocalEvent<FooComponent, EntityUnpausedEvent>(OnEntityUnpaused);
+                }
+
+                private void OnEntityUnpaused(EntityUid uid, FooComponent component, ref EntityUnpausedEvent args)
+                {
+                    component.Foo += args.PausedTime;
+                    Dirty(uid, component);
+                }
+            }
+            }
+
+            """);
+    }
+
+    [Test]
+    public void TestExplicitDirty()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause(Dirty = true)]
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField]
+                public TimeSpan Foo;
+            }
+            """);
+
+        ExpectNoDiagnostics(result);
+        ExpectSource(
+            result,
+            """
+            // <auto-generated />
+
+            using Robust.Shared.GameObjects;
+
+            public partial class FooComponent
+            {
+            [RobustAutoGenerated]
+            public sealed class FooComponent_AutoPauseSystem : EntitySystem
+            {
+                public override void Initialize()
+                {
+                    SubscribeLocalEvent<FooComponent, EntityUnpausedEvent>(OnEntityUnpaused);
+                }
+
+                private void OnEntityUnpaused(EntityUid uid, FooComponent component, ref EntityUnpausedEvent args)
+                {
+                    component.Foo += args.PausedTime;
+                    Dirty(uid, component);
+                }
+            }
+            }
+
+            """);
+    }
+
+    [Test]
+    public void TestDiagnosticNotIComponent()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent
+            {
+                [AutoPausedField]
+                public TimeSpan Foo;
+            }
+            """);
+
+        ExpectNoSource(result);
+        ExpectDiagnostics(result, [
+            (Diagnostics.IdComponentPauseNotComponent, new LinePositionSpan(new LinePosition(1, 28), new LinePosition(1, 40)))
+        ]);
+    }
+
+    [Test]
+    public void TestDiagnosticNoFields()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent : IComponent
+            {
+                public TimeSpan Foo;
+            }
+            """);
+
+        ExpectNoSource(result);
+        ExpectDiagnostics(result, [
+            (Diagnostics.IdComponentPauseNoFields, new LinePositionSpan(new LinePosition(1, 28), new LinePosition(1, 40)))
+        ]);
+    }
+
+    [Test]
+    public void TestDiagnosticNoParentAttribute()
+    {
+        var result = RunGenerator("""
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField]
+                public TimeSpan Foo, Fooz;
+
+                [AutoPausedField]
+                public TimeSpan Bar { get; set; }
+            }
+            """);
+
+        ExpectNoSource(result);
+        ExpectDiagnostics(result, [
+            (Diagnostics.IdComponentPauseNoParentAttribute, new LinePositionSpan(new LinePosition(3, 20), new LinePosition(3, 23))),
+            (Diagnostics.IdComponentPauseNoParentAttribute, new LinePositionSpan(new LinePosition(3, 25), new LinePosition(3, 29))),
+            (Diagnostics.IdComponentPauseNoParentAttribute, new LinePositionSpan(new LinePosition(6, 20), new LinePosition(6, 23)))
+        ]);
+    }
+
+    [Test]
+    public void TestDiagnosticWrongType()
+    {
+        var result = RunGenerator("""
+            [AutoGenerateComponentPause]
+            public sealed partial class FooComponent : IComponent
+            {
+                [AutoPausedField]
+                public int Foo, Fooz;
+
+                [AutoPausedField]
+                public int Bar { get; set; }
+            }
+            """);
+
+        ExpectNoSource(result);
+        ExpectDiagnostics(result, [
+            (Diagnostics.IdComponentPauseWrongTypeAttribute, new LinePositionSpan(new LinePosition(4, 15), new LinePosition(4, 18))),
+            (Diagnostics.IdComponentPauseWrongTypeAttribute, new LinePositionSpan(new LinePosition(4, 20), new LinePosition(4, 24))),
+            (Diagnostics.IdComponentPauseWrongTypeAttribute, new LinePositionSpan(new LinePosition(7, 15), new LinePosition(7, 18)))
+        ]);
+    }
+
+    private static void ExpectSource(GeneratorRunResult result, string expected)
+    {
+        Assert.That(result.GeneratedSources, Has.Length.EqualTo(1));
+
+        var source = result.GeneratedSources[0];
+
+        Assert.That(source.SourceText.ToString(), Is.EqualTo(expected));
+    }
+
+    private static void ExpectNoSource(GeneratorRunResult result)
+    {
+        Assert.That(result.GeneratedSources, Is.Empty);
+    }
+
+    private static void ExpectNoDiagnostics(GeneratorRunResult result)
+    {
+        Assert.That(result.Diagnostics, Is.Empty);
+    }
+
+    private static void ExpectDiagnostics(GeneratorRunResult result, (string code, LinePositionSpan span)[] diagnostics)
+    {
+        Assert.Multiple(() =>
+        {
+            Assert.That(result.Diagnostics, Has.Length.EqualTo(diagnostics.Length));
+            foreach (var (code, span) in diagnostics)
+            {
+                Assert.That(
+                    result.Diagnostics.Any(x => x.Id == code && x.Location.GetLineSpan().Span == span),
+                    $"Expected diagnostic with code {code} and location {span}");
+            }
+        });
+    }
+
+    private static GeneratorRunResult RunGenerator(string source)
+    {
+        var compilation = (Compilation)CSharpCompilation.Create("compilation",
+            new[]
+            {
+                CSharpSyntaxTree.ParseText(source, path: "Source.cs"),
+                CSharpSyntaxTree.ParseText(TypesCode, path: "Types.cs")
+            },
+            new[] { MetadataReference.CreateFromFile(typeof(Binder).GetTypeInfo().Assembly.Location) },
+            new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
+
+        var generator = new ComponentPauseGenerator();
+        GeneratorDriver driver = CSharpGeneratorDriver.Create(generator);
+        driver = driver.RunGeneratorsAndUpdateCompilation(compilation, out var newCompilation, out _);
+        var result = driver.GetRunResult();
+
+        return result.Results[0];
+    }
+}

Robust.Analyzers.Tests/DependencyAssignAnalyzerTest.cs

@@ -0,0 +1,58 @@
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CSharp.Testing;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.CodeAnalysis.Testing.Verifiers;
+using NUnit.Framework;
+using VerifyCS =
+    Microsoft.CodeAnalysis.CSharp.Testing.NUnit.AnalyzerVerifier<Robust.Analyzers.DependencyAssignAnalyzer>;
+
+namespace Robust.Analyzers.Tests;
+
+[Parallelizable(ParallelScope.All | ParallelScope.Fixtures)]
+[TestFixture]
+public sealed class DependencyAssignAnalyzerTest
+{
+    private static Task Verifier(string code, params DiagnosticResult[] expected)
+    {
+        var test = new CSharpAnalyzerTest<DependencyAssignAnalyzer, NUnitVerifier>()
+        {
+            TestState =
+            {
+                Sources = { code }
+            },
+        };
+
+        TestHelper.AddEmbeddedSources(
+            test.TestState,
+            "Robust.Shared.IoC.DependencyAttribute.cs"
+        );
+
+        // ExpectedDiagnostics cannot be set, so we need to AddRange here...
+        test.TestState.ExpectedDiagnostics.AddRange(expected);
+
+        return test.RunAsync();
+    }
+
+    [Test]
+    public async Task Test()
+    {
+        const string code = """
+            using Robust.Shared.IoC;
+
+            public sealed class Foo
+            {
+                [Dependency]
+                private object? Field;
+
+                public Foo()
+                {
+                    Field = "A";
+                }
+            }
+            """;
+
+        await Verifier(code,
+            // /0/Test0.cs(10,9): warning RA0025: Tried to assign to [Dependency] field 'Field'. Remove [Dependency] or inject it via field injection instead.
+            VerifyCS.Diagnostic().WithSpan(10, 9, 10, 20).WithArguments("Field"));
+    }
+}

Robust.Analyzers.Tests/Robust.Analyzers.Tests.csproj

@@ -1,24 +1,39 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <Import Project="..\MSBuild\Robust.Properties.targets" />
-  <Import Project="..\MSBuild\Robust.Engine.props" />
-  
+  <PropertyGroup>
+    <SkipRobustAnalyzer>true</SkipRobustAnalyzer>
+  </PropertyGroup>
+
+  <Import Project="..\MSBuild\Robust.Properties.targets"/>
+  <Import Project="..\MSBuild\Robust.Engine.props"/>
+
+  <!-- Engine source files needed to make the tests work -->
+  <ItemGroup>
+    <EmbeddedResource Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" LogicalName="Robust.Shared.Analyzers.AccessAttribute.cs" LinkBase="Implementations" />
+    <EmbeddedResource Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" LogicalName="Robust.Shared.Analyzers.AccessPermissions.cs" LinkBase="Implementations" />
+    <EmbeddedResource Include="..\Robust.Shared\IoC\DependencyAttribute.cs" LogicalName="Robust.Shared.IoC.DependencyAttribute.cs" LinkBase="Implementations" />
+  </ItemGroup>
+
   <PropertyGroup>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
-  
+
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzer.Testing" Version="1.1.1"/>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1"/>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.NUnit" Version="1.1.1"/>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1"/>
-    <PackageReference Include="NUnit" Version="3.13.2"/>
-    <PackageReference Include="NUnit.ConsoleRunner" Version="3.15.0"/>
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1"/>
-    <PackageReference Include="NUnit.Analyzers" Version="3.3.0"/>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
+    <PackageVersion Update="NUnit" Version="3.14.0" />
   </ItemGroup>
-  
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzer.Testing"/>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp"/>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.NUnit"/>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces"/>
+    <PackageReference Include="NUnit"/>
+    <PackageReference Include="NUnit3TestAdapter"/>
+    <PackageReference Include="NUnit.Analyzers"/>
+    <PackageReference Include="Microsoft.NET.Test.Sdk"/>
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Robust.Analyzers\Robust.Analyzers.csproj"/>
+    <ProjectReference Include="..\Robust.Serialization.Generator\Robust.Serialization.Generator.csproj" Aliases="SerializationGenerator" />
   </ItemGroup>
 </Project>

Robust.Analyzers.Tests/TestHelper.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.CodeAnalysis.Text;
+
+namespace Robust.Analyzers.Tests;
+
+public static class TestHelper
+{
+    public static void AddEmbeddedSources(SolutionState state, params string[] embeddedFiles)
+    {
+        AddEmbeddedSources(state, (IEnumerable<string>) embeddedFiles);
+    }
+
+    public static void AddEmbeddedSources(SolutionState state, IEnumerable<string> embeddedFiles)
+    {
+        foreach (var fileName in embeddedFiles)
+        {
+            using var stream = typeof(AccessAnalyzer_Test).Assembly.GetManifestResourceStream(fileName)!;
+            state.Sources.Add((fileName, SourceText.From(stream)));
+        }
+    }
+}

Robust.Analyzers/AccessAnalyzer.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
 using Robust.Shared.Analyzers.Implementation;
 
 namespace Robust.Analyzers

Robust.Analyzers/ByRefEventAnalyzer.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
 using static Microsoft.CodeAnalysis.SymbolEqualityComparer;
 
 namespace Robust.Analyzers;
@@ -16,27 +17,17 @@ public sealed class ByRefEventAnalyzer : DiagnosticAnalyzer
     private static readonly DiagnosticDescriptor ByRefEventSubscribedByValueRule = new(
         Diagnostics.IdByRefEventSubscribedByValue,
         "By-ref event subscribed to by value",
-        "Tried to subscribe to a by-ref event '{0}' by value.",
+        "Tried to subscribe to a by-ref event '{0}' by value",
         "Usage",
         DiagnosticSeverity.Error,
         true,
         "Make sure that methods subscribing to a ref event have the ref keyword for the event argument."
     );
 
-    private static readonly DiagnosticDescriptor ByValueEventSubscribedByRefRule = new(
-        Diagnostics.IdValueEventRaisedByRef,
-        "Value event subscribed to by-ref",
-        "Tried to subscribe to a value event '{0}' by-ref.",
-        "Usage",
-        DiagnosticSeverity.Error,
-        true,
-        "Make sure that methods subscribing to value events do not have the ref keyword for the event argument."
-    );
-
     private static readonly DiagnosticDescriptor ByRefEventRaisedByValueRule = new(
         Diagnostics.IdByRefEventRaisedByValue,
         "By-ref event raised by value",
-        "Tried to raise a by-ref event '{0}' by value.",
+        "Tried to raise a by-ref event '{0}' by value",
         "Usage",
         DiagnosticSeverity.Error,
         true,
@@ -46,7 +37,7 @@ public sealed class ByRefEventAnalyzer : DiagnosticAnalyzer
     private static readonly DiagnosticDescriptor ByValueEventRaisedByRefRule = new(
         Diagnostics.IdValueEventRaisedByRef,
         "Value event raised by-ref",
-        "Tried to raise a value event '{0}' by-ref.",
+        "Tried to raise a value event '{0}' by-ref",
         "Usage",
         DiagnosticSeverity.Error,
         true,
@@ -55,7 +46,6 @@ public sealed class ByRefEventAnalyzer : DiagnosticAnalyzer
 
     public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(
         ByRefEventSubscribedByValueRule,
-        ByValueEventSubscribedByRefRule,
         ByRefEventRaisedByValueRule,
         ByValueEventRaisedByRefRule
     );
@@ -64,71 +54,9 @@ public sealed class ByRefEventAnalyzer : DiagnosticAnalyzer
     {
         context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.ReportDiagnostics);
         context.EnableConcurrentExecution();
-        context.RegisterOperationAction(CheckEventSubscription, OperationKind.Invocation);
         context.RegisterOperationAction(CheckEventRaise, OperationKind.Invocation);
     }
 
-    private void CheckEventSubscription(OperationAnalysisContext context)
-    {
-        if (context.Operation is not IInvocationOperation operation)
-            return;
-
-        var subscribeMethods = context.Compilation
-            .GetTypeByMetadataName("Robust.Shared.GameObjects.EntitySystem")?
-            .GetMembers()
-            .Where(m => m.Name.Contains("SubscribeLocalEvent"))
-            .Cast<IMethodSymbol>();
-
-        if (subscribeMethods == null)
-            return;
-
-        if (!subscribeMethods.Any(m => m.Equals(operation.TargetMethod.OriginalDefinition, Default)))
-            return;
-
-        var typeArguments = operation.TargetMethod.TypeArguments;
-        if (typeArguments.Length < 1 || typeArguments.Length > 2)
-            return;
-
-        if (operation.Arguments.First().Value is not IDelegateCreationOperation delegateCreation)
-            return;
-
-        if (delegateCreation.Target is not IMethodReferenceOperation methodReference)
-            return;
-
-        var eventParameter = methodReference.Method.Parameters.LastOrDefault();
-        if (eventParameter == null)
-            return;
-
-        ITypeSymbol eventArgument;
-        switch (typeArguments.Length)
-        {
-            case 1:
-                eventArgument = typeArguments[0];
-                break;
-            case 2:
-                eventArgument = typeArguments[1];
-                break;
-            default:
-                return;
-        }
-
-        var byRefAttribute = context.Compilation.GetTypeByMetadataName(ByRefAttribute);
-        if (byRefAttribute == null)
-            return;
-
-        var isByRefEventType = eventArgument
-            .GetAttributes()
-            .Any(attribute => attribute.AttributeClass?.Equals(byRefAttribute, Default) ?? false);
-        var parameterIsRef = eventParameter.RefKind == RefKind.Ref;
-
-        if (isByRefEventType != parameterIsRef)
-        {
-            var descriptor = isByRefEventType ? ByRefEventSubscribedByValueRule : ByValueEventSubscribedByRefRule;
-            var diagnostic = Diagnostic.Create(descriptor, operation.Syntax.GetLocation(), eventArgument);
-            context.ReportDiagnostic(diagnostic);
-        }
-    }
-
     private void CheckEventRaise(OperationAnalysisContext context)
     {
         if (context.Operation is not IInvocationOperation operation)

Robust.Analyzers/DataDefinitionAnalyzer.cs

@@ -0,0 +1,294 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Robust.Roslyn.Shared;
+
+namespace Robust.Analyzers;
+
+[DiagnosticAnalyzer(LanguageNames.CSharp)]
+public sealed class DataDefinitionAnalyzer : DiagnosticAnalyzer
+{
+    private const string DataDefinitionNamespace = "Robust.Shared.Serialization.Manager.Attributes.DataDefinitionAttribute";
+    private const string ImplicitDataDefinitionNamespace = "Robust.Shared.Serialization.Manager.Attributes.ImplicitDataDefinitionForInheritorsAttribute";
+    private const string DataFieldBaseNamespace = "Robust.Shared.Serialization.Manager.Attributes.DataFieldBaseAttribute";
+
+    private static readonly DiagnosticDescriptor DataDefinitionPartialRule = new(
+        Diagnostics.IdDataDefinitionPartial,
+        "Type must be partial",
+        "Type {0} is a DataDefinition but is not partial",
+        "Usage",
+        DiagnosticSeverity.Error,
+        true,
+        "Make sure to mark any type that is a data definition as partial."
+    );
+
+    private static readonly DiagnosticDescriptor NestedDataDefinitionPartialRule = new(
+        Diagnostics.IdNestedDataDefinitionPartial,
+        "Type must be partial",
+        "Type {0} contains nested data definition {1} but is not partial",
+        "Usage",
+        DiagnosticSeverity.Error,
+        true,
+        "Make sure to mark any type containing a nested data definition as partial."
+    );
+
+    private static readonly DiagnosticDescriptor DataFieldWritableRule = new(
+        Diagnostics.IdDataFieldWritable,
+        "Data field must not be readonly",
+        "Data field {0} in data definition {1} is readonly",
+        "Usage",
+        DiagnosticSeverity.Error,
+        true,
+        "Make sure to remove the readonly modifier."
+    );
+
+    private static readonly DiagnosticDescriptor DataFieldPropertyWritableRule = new(
+        Diagnostics.IdDataFieldPropertyWritable,
+        "Data field property must have a setter",
+        "Data field property {0} in data definition {1} does not have a setter",
+        "Usage",
+        DiagnosticSeverity.Error,
+        true,
+        "Make sure to add a setter."
+    );
+
+    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(
+        DataDefinitionPartialRule, NestedDataDefinitionPartialRule, DataFieldWritableRule, DataFieldPropertyWritableRule
+    );
+
+    public override void Initialize(AnalysisContext context)
+    {
+        context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze | GeneratedCodeAnalysisFlags.None);
+        context.EnableConcurrentExecution();
+
+        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.ClassDeclaration);
+        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.StructDeclaration);
+        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordDeclaration);
+        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.RecordStructDeclaration);
+        context.RegisterSyntaxNodeAction(AnalyzeDataDefinition, SyntaxKind.InterfaceDeclaration);
+
+        context.RegisterSyntaxNodeAction(AnalyzeDataField, SyntaxKind.FieldDeclaration);
+        context.RegisterSyntaxNodeAction(AnalyzeDataFieldProperty, SyntaxKind.PropertyDeclaration);
+    }
+
+    private void AnalyzeDataDefinition(SyntaxNodeAnalysisContext context)
+    {
+        if (context.Node is not TypeDeclarationSyntax declaration)
+            return;
+
+        var type = context.SemanticModel.GetDeclaredSymbol(declaration)!;
+        if (!IsDataDefinition(type))
+            return;
+
+        if (!IsPartial(declaration))
+        {
+            context.ReportDiagnostic(Diagnostic.Create(DataDefinitionPartialRule, declaration.Keyword.GetLocation(), type.Name));
+        }
+
+        var containingType = type.ContainingType;
+        while (containingType != null)
+        {
+            var containingTypeDeclaration = (TypeDeclarationSyntax) containingType.DeclaringSyntaxReferences[0].GetSyntax();
+            if (!IsPartial(containingTypeDeclaration))
+            {
+                context.ReportDiagnostic(Diagnostic.Create(NestedDataDefinitionPartialRule, containingTypeDeclaration.Keyword.GetLocation(), containingType.Name, type.Name));
+            }
+
+            containingType = containingType.ContainingType;
+        }
+    }
+
+    private void AnalyzeDataField(SyntaxNodeAnalysisContext context)
+    {
+        if (context.Node is not FieldDeclarationSyntax field)
+            return;
+
+        var typeDeclaration = field.FirstAncestorOrSelf<TypeDeclarationSyntax>();
+        if (typeDeclaration == null)
+            return;
+
+        var type = context.SemanticModel.GetDeclaredSymbol(typeDeclaration)!;
+        if (!IsDataDefinition(type))
+            return;
+
+        foreach (var variable in field.Declaration.Variables)
+        {
+            var fieldSymbol = context.SemanticModel.GetDeclaredSymbol(variable);
+            if (fieldSymbol == null)
+                continue;
+
+            if (IsReadOnlyDataField(type, fieldSymbol))
+            {
+                context.ReportDiagnostic(Diagnostic.Create(DataFieldWritableRule, context.Node.GetLocation(), fieldSymbol.Name, type.Name));
+            }
+        }
+    }
+
+    private void AnalyzeDataFieldProperty(SyntaxNodeAnalysisContext context)
+    {
+        if (context.Node is not PropertyDeclarationSyntax property)
+            return;
+
+        var typeDeclaration = property.FirstAncestorOrSelf<TypeDeclarationSyntax>();
+        if (typeDeclaration == null)
+            return;
+
+        var type = context.SemanticModel.GetDeclaredSymbol(typeDeclaration)!;
+        if (!IsDataDefinition(type) || type.IsRecord || type.IsValueType)
+            return;
+
+        var propertySymbol = context.SemanticModel.GetDeclaredSymbol(property);
+        if (propertySymbol == null)
+            return;
+
+        if (IsReadOnlyDataField(type, propertySymbol))
+        {
+            context.ReportDiagnostic(Diagnostic.Create(DataFieldPropertyWritableRule, context.Node.GetLocation(), propertySymbol.Name, type.Name));
+        }
+    }
+
+    private static bool IsReadOnlyDataField(ITypeSymbol type, ISymbol field)
+    {
+        if (!IsDataField(field, out _, out _))
+            return false;
+
+        return IsReadOnlyMember(type, field);
+    }
+
+    private static bool IsPartial(TypeDeclarationSyntax type)
+    {
+        return type.Modifiers.IndexOf(SyntaxKind.PartialKeyword) != -1;
+    }
+
+    private static bool IsDataDefinition(ITypeSymbol? type)
+    {
+        if (type == null)
+            return false;
+
+        return HasAttribute(type, DataDefinitionNamespace) ||
+               IsImplicitDataDefinition(type);
+    }
+
+    private static bool IsDataField(ISymbol member, out ITypeSymbol type, out AttributeData attribute)
+    {
+        // TODO data records and other attributes
+        if (member is IFieldSymbol field)
+        {
+            foreach (var attr in field.GetAttributes())
+            {
+                if (attr.AttributeClass != null && Inherits(attr.AttributeClass, DataFieldBaseNamespace))
+                {
+                    type = field.Type;
+                    attribute = attr;
+                    return true;
+                }
+            }
+        }
+        else if (member is IPropertySymbol property)
+        {
+            foreach (var attr in property.GetAttributes())
+            {
+                if (attr.AttributeClass != null && Inherits(attr.AttributeClass, DataFieldBaseNamespace))
+                {
+                    type = property.Type;
+                    attribute = attr;
+                    return true;
+                }
+            }
+        }
+
+        type = null!;
+        attribute = null!;
+        return false;
+    }
+
+    private static bool Inherits(ITypeSymbol type, string parent)
+    {
+        foreach (var baseType in GetBaseTypes(type))
+        {
+            if (baseType.ToDisplayString() == parent)
+                return true;
+        }
+
+        return false;
+    }
+
+    private static bool IsReadOnlyMember(ITypeSymbol type, ISymbol member)
+    {
+        if (member is IFieldSymbol field)
+        {
+            return field.IsReadOnly;
+        }
+        else if (member is IPropertySymbol property)
+        {
+            if (property.SetMethod == null)
+                return true;
+
+            if (property.SetMethod.IsInitOnly)
+                return type.IsReferenceType;
+
+            return false;
+        }
+
+        return false;
+    }
+
+    private static bool HasAttribute(ITypeSymbol type, string attributeName)
+    {
+        foreach (var attribute in type.GetAttributes())
+        {
+            if (attribute.AttributeClass?.ToDisplayString() == attributeName)
+                return true;
+        }
+
+        return false;
+    }
+
+    private static bool IsImplicitDataDefinition(ITypeSymbol type)
+    {
+        if (HasAttribute(type, ImplicitDataDefinitionNamespace))
+            return true;
+
+        foreach (var baseType in GetBaseTypes(type))
+        {
+            if (HasAttribute(baseType, ImplicitDataDefinitionNamespace))
+                return true;
+        }
+
+        foreach (var @interface in type.AllInterfaces)
+        {
+            if (IsImplicitDataDefinitionInterface(@interface))
+                return true;
+        }
+
+        return false;
+    }
+
+    private static bool IsImplicitDataDefinitionInterface(ITypeSymbol @interface)
+    {
+        if (HasAttribute(@interface, ImplicitDataDefinitionNamespace))
+            return true;
+
+        foreach (var subInterface in @interface.AllInterfaces)
+        {
+            if (HasAttribute(subInterface, ImplicitDataDefinitionNamespace))
+                return true;
+        }
+
+        return false;
+    }
+
+    private static IEnumerable<ITypeSymbol> GetBaseTypes(ITypeSymbol type)
+    {
+        var baseType = type.BaseType;
+        while (baseType != null)
+        {
+            yield return baseType;
+            baseType = baseType.BaseType;
+        }
+    }
+}

Robust.Analyzers/DataDefinitionFixer.cs

@@ -0,0 +1,168 @@
+#nullable enable
+using System.Collections.Immutable;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CodeActions;
+using Microsoft.CodeAnalysis.CodeFixes;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using static Microsoft.CodeAnalysis.CSharp.SyntaxKind;
+using static Robust.Roslyn.Shared.Diagnostics;
+
+namespace Robust.Analyzers;
+
+[ExportCodeFixProvider(LanguageNames.CSharp)]
+public sealed class DefinitionFixer : CodeFixProvider
+{
+    public override ImmutableArray<string> FixableDiagnosticIds => ImmutableArray.Create(
+        IdDataDefinitionPartial, IdNestedDataDefinitionPartial, IdDataFieldWritable, IdDataFieldPropertyWritable
+    );
+
+    public override Task RegisterCodeFixesAsync(CodeFixContext context)
+    {
+        foreach (var diagnostic in context.Diagnostics)
+        {
+            switch (diagnostic.Id)
+            {
+                case IdDataDefinitionPartial:
+                    return RegisterPartialTypeFix(context, diagnostic);
+                case IdNestedDataDefinitionPartial:
+                    return RegisterPartialTypeFix(context, diagnostic);
+                case IdDataFieldWritable:
+                    return RegisterDataFieldFix(context, diagnostic);
+                case IdDataFieldPropertyWritable:
+                    return RegisterDataFieldPropertyFix(context, diagnostic);
+            }
+        }
+
+        return Task.CompletedTask;
+    }
+
+    public override FixAllProvider GetFixAllProvider()
+    {
+        return WellKnownFixAllProviders.BatchFixer;
+    }
+
+    private static async Task RegisterPartialTypeFix(CodeFixContext context, Diagnostic diagnostic)
+    {
+        var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken);
+        var span = diagnostic.Location.SourceSpan;
+        var token = root?.FindToken(span.Start).Parent?.AncestorsAndSelf().OfType<TypeDeclarationSyntax>().First();
+
+        if (token == null)
+            return;
+
+        context.RegisterCodeFix(CodeAction.Create(
+            "Make type partial",
+            c => MakeDataDefinitionPartial(context.Document, token, c),
+            "Make type partial"
+        ), diagnostic);
+    }
+
+    private static async Task<Document> MakeDataDefinitionPartial(Document document, TypeDeclarationSyntax declaration, CancellationToken cancellation)
+    {
+        var root = (CompilationUnitSyntax?) await document.GetSyntaxRootAsync(cancellation);
+        var token = SyntaxFactory.Token(PartialKeyword);
+        var newDeclaration = declaration.AddModifiers(token);
+
+        root = root!.ReplaceNode(declaration, newDeclaration);
+
+        return document.WithSyntaxRoot(root);
+    }
+
+    private static async Task RegisterDataFieldFix(CodeFixContext context, Diagnostic diagnostic)
+    {
+        var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken);
+        var span = diagnostic.Location.SourceSpan;
+        var field = root?.FindToken(span.Start).Parent?.AncestorsAndSelf().OfType<FieldDeclarationSyntax>().FirstOrDefault();
+
+        if (field == null)
+            return;
+
+        context.RegisterCodeFix(CodeAction.Create(
+            "Make data field writable",
+            c => MakeFieldWritable(context.Document, field, c),
+            "Make data field writable"
+        ), diagnostic);
+    }
+
+    private static async Task RegisterDataFieldPropertyFix(CodeFixContext context, Diagnostic diagnostic)
+    {
+        var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken);
+        var span = diagnostic.Location.SourceSpan;
+        var property = root?.FindToken(span.Start).Parent?.AncestorsAndSelf().OfType<PropertyDeclarationSyntax>().FirstOrDefault();
+
+        if (property == null)
+            return;
+
+        context.RegisterCodeFix(CodeAction.Create(
+            "Make data field writable",
+            c => MakePropertyWritable(context.Document, property, c),
+            "Make data field writable"
+        ), diagnostic);
+    }
+
+    private static async Task<Document> MakeFieldWritable(Document document, FieldDeclarationSyntax declaration, CancellationToken cancellation)
+    {
+        var root = (CompilationUnitSyntax?) await document.GetSyntaxRootAsync(cancellation);
+        var token = declaration.Modifiers.First(t => t.IsKind(ReadOnlyKeyword));
+        var newDeclaration = declaration.WithModifiers(declaration.Modifiers.Remove(token));
+
+        root = root!.ReplaceNode(declaration, newDeclaration);
+
+        return document.WithSyntaxRoot(root);
+    }
+
+    private static async Task<Document> MakePropertyWritable(Document document, PropertyDeclarationSyntax declaration, CancellationToken cancellation)
+    {
+        var root = (CompilationUnitSyntax?) await document.GetSyntaxRootAsync(cancellation);
+        var newDeclaration = declaration;
+        var privateSet = newDeclaration
+            .AccessorList?
+            .Accessors
+            .FirstOrDefault(s => s.IsKind(SetAccessorDeclaration) || s.IsKind(InitAccessorDeclaration));
+
+        if (newDeclaration.AccessorList != null && privateSet != null)
+        {
+            newDeclaration = newDeclaration.WithAccessorList(
+                newDeclaration.AccessorList.WithAccessors(
+                    newDeclaration.AccessorList.Accessors.Remove(privateSet)
+                )
+            );
+        }
+
+        AccessorDeclarationSyntax setter;
+        if (declaration.Modifiers.Any(m => m.IsKind(PrivateKeyword)))
+        {
+            setter = SyntaxFactory.AccessorDeclaration(
+                SetAccessorDeclaration,
+                default,
+                default,
+                SyntaxFactory.Token(SetKeyword),
+                default,
+                default,
+                SyntaxFactory.Token(SemicolonToken)
+            );
+        }
+        else
+        {
+            setter = SyntaxFactory.AccessorDeclaration(
+                SetAccessorDeclaration,
+                default,
+                SyntaxFactory.TokenList(SyntaxFactory.Token(PrivateKeyword)),
+                SyntaxFactory.Token(SetKeyword),
+                default,
+                default,
+                SyntaxFactory.Token(SemicolonToken)
+            );
+        }
+
+        newDeclaration = newDeclaration.AddAccessorListAccessors(setter);
+
+        root = root!.ReplaceNode(declaration, newDeclaration);
+
+        return document.WithSyntaxRoot(root);
+    }
+}

Robust.Analyzers/DependencyAssignAnalyzer.cs

@@ -0,0 +1,61 @@
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
+
+namespace Robust.Analyzers;
+
+[DiagnosticAnalyzer(LanguageNames.CSharp)]
+public sealed class DependencyAssignAnalyzer : DiagnosticAnalyzer
+{
+    private const string DependencyAttributeType = "Robust.Shared.IoC.DependencyAttribute";
+
+    private static readonly DiagnosticDescriptor Rule = new (
+        Diagnostics.IdDependencyFieldAssigned,
+        "Assignment to dependency field",
+        "Tried to assign to [Dependency] field '{0}'. Remove [Dependency] or inject it via field injection instead.",
+        "Usage",
+        DiagnosticSeverity.Warning,
+        true);
+
+    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(Rule);
+
+    public override void Initialize(AnalysisContext context)
+    {
+        context.EnableConcurrentExecution();
+        context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+        context.RegisterOperationAction(CheckAssignment, OperationKind.SimpleAssignment);
+    }
+
+    private static void CheckAssignment(OperationAnalysisContext context)
+    {
+        if (context.Operation is not ISimpleAssignmentOperation assignment)
+            return;
+
+        if (assignment.Target is not IFieldReferenceOperation fieldRef)
+            return;
+
+        var field = fieldRef.Field;
+        var attributes = field.GetAttributes();
+        if (attributes.Length == 0)
+            return;
+
+        var depAttribute = context.Compilation.GetTypeByMetadataName(DependencyAttributeType);
+        if (!HasAttribute(attributes, depAttribute))
+            return;
+
+        context.ReportDiagnostic(Diagnostic.Create(Rule, assignment.Syntax.GetLocation(), field.Name));
+    }
+
+    private static bool HasAttribute(ImmutableArray<AttributeData> attributes, ISymbol symbol)
+    {
+        foreach (var attribute in attributes)
+        {
+            if (SymbolEqualityComparer.Default.Equals(attribute.AttributeClass, symbol))
+                return true;
+        }
+
+        return false;
+    }
+}

Robust.Analyzers/ExplicitInterfaceAnalyzer.cs

@@ -10,6 +10,7 @@ using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
+using Robust.Roslyn.Shared;
 using Document = Microsoft.CodeAnalysis.Document;
 
 namespace Robust.Analyzers

Robust.Analyzers/ExplicitVirtualAnalyzer.cs

@@ -5,6 +5,7 @@ using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers;
 

Robust.Analyzers/MeansImplicitAssigmentSuppressor.cs

@@ -2,6 +2,7 @@ using System.Collections.Immutable;
 using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers
 {

Robust.Analyzers/NotNullableFlagAnalyzer.cs

@@ -3,6 +3,7 @@ using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers;
 
@@ -31,7 +32,7 @@ public sealed class NotNullableFlagAnalyzer : DiagnosticAnalyzer
 
     private static readonly DiagnosticDescriptor InvalidNotNullableImplementationRule = new (
         Diagnostics.IdInvalidNotNullableFlagImplementation,
-        "Invalid NotNullable flag implementation.",
+        "Invalid NotNullable flag implementation",
         "NotNullable flag is either not typed as bool, or does not have a default value equaling false",
         "Usage",
         DiagnosticSeverity.Error,
@@ -41,7 +42,7 @@ public sealed class NotNullableFlagAnalyzer : DiagnosticAnalyzer
     private static readonly DiagnosticDescriptor InvalidNotNullableTypeRule = new (
         Diagnostics.IdInvalidNotNullableFlagType,
         "Failed to resolve type parameter",
-        "Failed to resolve type parameter \"{0}\".",
+        "Failed to resolve type parameter \"{0}\"",
         "Usage",
         DiagnosticSeverity.Error,
         true,
@@ -49,7 +50,7 @@ public sealed class NotNullableFlagAnalyzer : DiagnosticAnalyzer
 
     private static readonly DiagnosticDescriptor NotNullableFlagValueTypeRule = new (
         Diagnostics.IdNotNullableFlagValueType,
-        "NotNullable flag not supported for value types.",
+        "NotNullable flag not supported for value types",
         "Value types as generic arguments are not supported for NotNullable flags",
         "Usage",
         DiagnosticSeverity.Error,

Robust.Analyzers/PreferGenericVariantAnalyzer.cs

@@ -11,6 +11,7 @@ using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers;
 

Robust.Analyzers/Robust.Analyzers.csproj

@@ -1,30 +1,30 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
-    <LangVersion>10</LangVersion>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="4.0.1" />
-  </ItemGroup>
-
   <ItemGroup>
     <!-- Needed for NotNullableFlagAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\NotNullableFlagAttribute.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\NotNullableFlagAttribute.cs" LinkBase="Implementations" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <!-- Needed for FriendAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" />
-    <Compile Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\AccessAttribute.cs" LinkBase="Implementations" />
+    <Compile Include="..\Robust.Shared\Analyzers\AccessPermissions.cs" LinkBase="Implementations" />
   </ItemGroup>
 
   <ItemGroup>
     <!-- Needed for PreferGenericVariantAnalyzer. -->
-    <Compile Include="..\Robust.Shared\Analyzers\PreferGenericVariantAttribute.cs" />
+    <Compile Include="..\Robust.Shared\Analyzers\PreferGenericVariantAttribute.cs" LinkBase="Implementations" />
   </ItemGroup>
 
+  <Import Project="../Robust.Roslyn.Shared/Robust.Roslyn.Shared.props" />
+
+  <PropertyGroup>
+    <Nullable>disable</Nullable>
+    <!--
+    Rider seems to get really confused with hot reload if we directly compile in the above-linked classes.
+    As such, they have an #if to change their namespace in this project.
+    -->
+    <DefineConstants>$(DefineConstants);ROBUST_ANALYZERS_IMPL</DefineConstants>
+  </PropertyGroup>
+
 </Project>

Robust.Analyzers/SerializableAnalyzer.cs

@@ -10,6 +10,7 @@ using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers
 {

Robust.Analyzers/TaskResultAnalyzer.cs

@@ -3,6 +3,7 @@ using System.Diagnostics.CodeAnalysis;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Operations;
+using Robust.Roslyn.Shared;
 
 namespace Robust.Analyzers;
 

Robust.Benchmarks/Collections/ValueListEnumerationBenchmarks.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using BenchmarkDotNet.Attributes;
+using Robust.Shared.Analyzers;
+using Robust.Shared.Collections;
+
+namespace Robust.Benchmarks.Collections;
+
+[Virtual]
+public class ValueListEnumerationBenchmarks
+{
+    [Params(4, 16, 64)]
+    public int N { get; set; }
+
+    private sealed class Data(int i)
+    {
+        public readonly int I = i;
+    }
+
+    private ValueList<Data> _valueList;
+    private Data[] _array = default!;
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        var list = new List<Data>(N);
+        for (var i = 0; i < N; i++)
+        {
+            list.Add(new(i));
+        }
+
+        _array = list.ToArray();
+        _valueList = new(list.ToArray());
+    }
+
+    [Benchmark]
+    public int ValueList()
+    {
+        var total = 0;
+        foreach (var ev in _valueList)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int ValueListSpan()
+    {
+        var total = 0;
+        foreach (var ev in _valueList.Span)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int Array()
+    {
+        var total = 0;
+        foreach (var ev in _array)
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+
+    [Benchmark]
+    public int Span()
+    {
+        var total = 0;
+        foreach (var ev in _array.AsSpan())
+        {
+            total += ev.I;
+        }
+
+        return total;
+    }
+}

Robust.Benchmarks/Configs/DefaultSQLConfig.cs

@@ -1,15 +1,18 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Globalization;
 using BenchmarkDotNet.Analysers;
 using BenchmarkDotNet.Columns;
 using BenchmarkDotNet.Configs;
 using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.EventProcessors;
 using BenchmarkDotNet.Exporters;
 using BenchmarkDotNet.Filters;
 using BenchmarkDotNet.Jobs;
 using BenchmarkDotNet.Loggers;
 using BenchmarkDotNet.Order;
 using BenchmarkDotNet.Reports;
+using BenchmarkDotNet.Running;
 using BenchmarkDotNet.Validators;
 using Robust.Benchmarks.Exporters;
 
@@ -44,10 +47,16 @@ public sealed class DefaultSQLConfig : IConfig
 
     public IEnumerable<BenchmarkLogicalGroupRule> GetLogicalGroupRules() => DefaultConfig.Instance.GetLogicalGroupRules();
 
+    public IEnumerable<EventProcessor> GetEventProcessors() => DefaultConfig.Instance.GetEventProcessors();
+
+    public IEnumerable<IColumnHidingRule> GetColumnHidingRules() => DefaultConfig.Instance.GetColumnHidingRules();
     public IOrderer Orderer => DefaultConfig.Instance.Orderer!;
+    public ICategoryDiscoverer? CategoryDiscoverer => DefaultConfig.Instance.CategoryDiscoverer;
     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;
+    public TimeSpan BuildTimeout => DefaultConfig.Instance.BuildTimeout;
+    public IReadOnlyList<Conclusion> ConfigAnalysisConclusion => DefaultConfig.Instance.ConfigAnalysisConclusion;
 }

Robust.Benchmarks/EntityManager/AddRemoveComponentBenchmark.cs

@@ -8,7 +8,7 @@ using Robust.UnitTesting.Server;
 namespace Robust.Benchmarks.EntityManager;
 
 [Virtual]
-public class AddRemoveComponentBenchmark
+public partial class AddRemoveComponentBenchmark
 {
     private ISimulation _simulation = default!;
     private IEntityManager _entityManager = default!;
@@ -26,9 +26,8 @@ public class AddRemoveComponentBenchmark
             .InitializeInstance();
 
         _entityManager = _simulation.Resolve<IEntityManager>();
-
-        var coords = new MapCoordinates(0, 0, new MapId(1));
-        _simulation.AddMap(coords.MapId);
+        var map = _simulation.CreateMap().Uid;
+        var coords = new EntityCoordinates(map, default);
 
         for (var i = 0; i < N; i++)
         {
@@ -48,7 +47,7 @@ public class AddRemoveComponentBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    public sealed partial class A : Component
     {
     }
 }

Robust.Benchmarks/EntityManager/ArchetypeComponentAccessBenchmark.cs

@@ -905,7 +905,7 @@ public class ArchetypeComponentAccessBenchmark
             var curLength = array.Length;
             if (curLength <= idx.Value)
             {
-                var newLength = MathHelper.NextPowerOfTwo(Math.Max(8, idx.Value));
+                var newLength = MathHelper.NextPowerOfTwo(System.Math.Max(8, idx.Value));
                 Array.Resize(ref array, newLength);
             }
 

Robust.Benchmarks/EntityManager/ComponentIteratorBenchmark.cs

@@ -0,0 +1,75 @@
+using BenchmarkDotNet.Attributes;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.UnitTesting.Server;
+
+namespace Robust.Benchmarks.EntityManager;
+
+public partial class ComponentIteratorBenchmark
+{
+    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 map = _simulation.CreateMap().MapId;
+        var coords = new MapCoordinates(default, map);
+
+        for (var i = 0; i < N; i++)
+        {
+            var uid = _entityManager.SpawnEntity(null, coords);
+            _entityManager.AddComponent<A>(uid);
+        }
+    }
+
+    [Benchmark]
+    public A[] ComponentStructEnumerator()
+    {
+        var query = _entityManager.EntityQueryEnumerator<A>();
+        var i = 0;
+
+        while (query.MoveNext(out var comp))
+        {
+            Comps[i] = comp;
+            i++;
+        }
+
+        return Comps;
+    }
+
+    [Benchmark]
+    public A[] ComponentIEnumerable()
+    {
+        var i = 0;
+
+        foreach (var comp in _entityManager.EntityQuery<A>())
+        {
+            Comps[i] = comp;
+            i++;
+        }
+
+        return Comps;
+    }
+
+    [ComponentProtoName("A")]
+    public sealed partial class A : Component
+    {
+    }
+}

Robust.Benchmarks/EntityManager/GetComponentBenchmark.cs

@@ -1,4 +1,3 @@
-using System;
 using BenchmarkDotNet.Attributes;
 using JetBrains.Annotations;
 using Robust.Shared.Analyzers;
@@ -9,7 +8,7 @@ using Robust.UnitTesting.Server;
 namespace Robust.Benchmarks.EntityManager;
 
 [Virtual]
-public class GetComponentBenchmark
+public partial class GetComponentBenchmark
 {
     private ISimulation _simulation = default!;
     private IEntityManager _entityManager = default!;
@@ -32,8 +31,8 @@ public class GetComponentBenchmark
 
         Comps = new A[N+2];
 
-        var coords = new MapCoordinates(0, 0, new MapId(1));
-        _simulation.AddMap(coords.MapId);
+        var map = _simulation.CreateMap().Uid;
+        var coords = new EntityCoordinates(map, default);
 
         for (var i = 0; i < N; i++)
         {
@@ -55,7 +54,7 @@ public class GetComponentBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    public sealed partial class A : Component
     {
     }
 }

Robust.Benchmarks/EntityManager/SpawnDeleteEntityBenchmark.cs

@@ -8,7 +8,7 @@ using Robust.UnitTesting.Server;
 namespace Robust.Benchmarks.EntityManager;
 
 [Virtual]
-public class SpawnDeleteEntityBenchmark
+public partial class SpawnDeleteEntityBenchmark
 {
     private ISimulation _simulation = default!;
     private IEntityManager _entityManager = default!;
@@ -29,10 +29,9 @@ public class SpawnDeleteEntityBenchmark
             .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);
+        var (map, mapId) = _simulation.CreateMap();
+        _mapCoords = new MapCoordinates(default, mapId);
+        _entCoords = new EntityCoordinates(map, 0, 0);
     }
 
     [Benchmark(Baseline = true)]
@@ -56,7 +55,7 @@ public class SpawnDeleteEntityBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    public sealed partial class A : Component
     {
     }
 }

Robust.Benchmarks/NumericsHelpers/AddBenchmark.cs

@@ -1,33 +1,32 @@
 using BenchmarkDotNet.Attributes;
 using Robust.Shared.Analyzers;
 
-namespace Robust.Benchmarks.NumericsHelpers
+namespace Robust.Benchmarks.NumericsHelpers;
+
+[Virtual]
+public class AddBenchmark
 {
-    [Virtual]
-    public class AddBenchmark
+    [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!;
+
+    [GlobalSetup]
+    public void Setup()
     {
-        [Params(32, 128)]
-        public int N { get; set; }
+        _inputA = new float[N];
+        _inputB = new float[N];
+        _output = new float[N];
+    }
 
-        [Params(1,2)]
-        public int T { get; set; }
-
-        private float[] _inputA = default!;
-        private float[] _inputB = default!;
-        private float[] _output = default!;
-
-        [GlobalSetup]
-        public void Setup()
-        {
-            _inputA = new float[N];
-            _inputB = new float[N];
-            _output = new float[N];
-        }
-
-        [Benchmark]
-        public void Bench()
-        {
-            Shared.Maths.NumericsHelpers.Add(_inputA, _inputB, _output);
-        }
+    [Benchmark]
+    public void Bench()
+    {
+        Shared.Maths.NumericsHelpers.Add(_inputA, _inputB, _output);
     }
 }

Robust.Benchmarks/Robust.Benchmarks.csproj

@@ -13,12 +13,12 @@
     <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">
+    <PackageReference Include="BenchmarkDotNet" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.4" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" />
   </ItemGroup>
 
   <Import Project="..\MSBuild\Robust.Properties.targets" />

Robust.Benchmarks/Serialization/Definitions/DataDefinitionWithString.cs

@@ -5,9 +5,9 @@ namespace Robust.Benchmarks.Serialization.Definitions
 {
     [DataDefinition]
     [Virtual]
-    public class DataDefinitionWithString
+    public partial class DataDefinitionWithString
     {
         [DataField("string")]
-        public string StringField { get; init; } = default!;
+        public string StringField { get; set; } = default!;
     }
 }

Robust.Benchmarks/Serialization/Definitions/SealedDataDefinitionWithString.cs

@@ -3,9 +3,9 @@
 namespace Robust.Benchmarks.Serialization.Definitions
 {
     [DataDefinition]
-    public sealed class SealedDataDefinitionWithString
+    public sealed partial class SealedDataDefinitionWithString
     {
         [DataField("string")]
-        public string StringField { get; init; } = default!;
+        public string StringField { get; private set; } = default!;
     }
 }

Robust.Benchmarks/Serialization/Definitions/SeedDataDefinition.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using Robust.Shared.GameObjects;
 using Robust.Shared.Maths;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Manager.Attributes;
@@ -10,8 +11,7 @@ namespace Robust.Benchmarks.Serialization.Definitions
     ///     Arbitrarily large data definition for benchmarks.
     ///     Taken from content.
     /// </summary>
-    [Prototype("seed")]
-    public sealed class SeedDataDefinition : IPrototype
+    public sealed partial class SeedDataDefinition : Component
     {
         public const string Prototype = @"
 - type: seed
@@ -106,7 +106,7 @@ namespace Robust.Benchmarks.Serialization.Definitions
     }
 
     [DataDefinition]
-    public struct SeedChemQuantity
+    public partial struct SeedChemQuantity
     {
         [DataField("Min")]
         public int Min;

Robust.Benchmarks/Transform/RecursiveMoveBenchmark.cs

@@ -0,0 +1,252 @@
+using System;
+using System.Linq;
+using System.Numerics;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+using Robust.Server.Containers;
+using Robust.Server.GameStates;
+using Robust.Shared;
+using Robust.Shared.Analyzers;
+using Robust.Shared.Configuration;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Network;
+using Robust.Shared.Player;
+using Robust.UnitTesting;
+
+namespace Robust.Benchmarks.Transform;
+
+/// <summary>
+/// This benchmark tests various transform/move related functions with an entity that has many children.
+/// </summary>
+[Virtual, MemoryDiagnoser]
+public class RecursiveMoveBenchmark : RobustIntegrationTest
+{
+    private IEntityManager _entMan = default!;
+    private SharedTransformSystem _transform = default!;
+    private ContainerSystem _container = default!;
+    private PvsSystem _pvs = default!;
+    private EntityCoordinates _mapCoords;
+    private EntityCoordinates _gridCoords;
+    private EntityCoordinates _gridCoords2;
+    private EntityUid _ent;
+    private EntityUid _child;
+    private TransformComponent _childXform = default!;
+    private EntityQuery<TransformComponent> _query;
+    private ICommonSession[] _players = default!;
+    private PvsSession _session = default!;
+
+    [GlobalSetup]
+    public void GlobalSetup()
+    {
+        ProgramShared.PathOffset = "../../../../";
+        var server = StartServer();
+        var client = StartClient();
+
+        Task.WhenAll(client.WaitIdleAsync(), server.WaitIdleAsync()).Wait();
+
+        var mapMan = server.ResolveDependency<IMapManager>();
+        _entMan = server.ResolveDependency<IEntityManager>();
+        var confMan = server.ResolveDependency<IConfigurationManager>();
+        var sPlayerMan = server.ResolveDependency<ISharedPlayerManager>();
+
+        _transform = _entMan.System<SharedTransformSystem>();
+        _container = _entMan.System<ContainerSystem>();
+        _pvs = _entMan.System<PvsSystem>();
+        _query = _entMan.GetEntityQuery<TransformComponent>();
+        var mapSys = _entMan.System<SharedMapSystem>();
+
+        var netMan = client.ResolveDependency<IClientNetManager>();
+        client.SetConnectTarget(server);
+        client.Post(() => netMan.ClientConnect(null!, 0, null!));
+        server.Post(() => confMan.SetCVar(CVars.NetPVS, true));
+
+        for (int i = 0; i < 10; i++)
+        {
+            server.WaitRunTicks(1).Wait();
+            client.WaitRunTicks(1).Wait();
+        }
+
+        // Ensure client & server ticks are synced.
+        // Client runs 1 tick ahead
+        {
+            var sTick = (int)server.Timing.CurTick.Value;
+            var cTick = (int)client.Timing.CurTick.Value;
+            var delta = cTick - sTick;
+
+            if (delta > 1)
+                server.WaitRunTicks(delta - 1).Wait();
+            else if (delta < 1)
+                client.WaitRunTicks(1 - delta).Wait();
+
+            sTick = (int)server.Timing.CurTick.Value;
+            cTick = (int)client.Timing.CurTick.Value;
+            delta = cTick - sTick;
+            if (delta != 1)
+                throw new Exception("Failed setup");
+        }
+
+        // Set up map and spawn player
+        server.WaitPost(() =>
+        {
+            var map = server.ResolveDependency<SharedMapSystem>().CreateMap(out var mapId);
+            var gridComp = mapMan.CreateGridEntity(mapId);
+            var grid = gridComp.Owner;
+            mapSys.SetTile(grid, gridComp, Vector2i.Zero, new Tile(1));
+            _gridCoords = new EntityCoordinates(grid, .5f, .5f);
+            _gridCoords2 = new EntityCoordinates(grid, .5f, .6f);
+            _mapCoords = new EntityCoordinates(map, 100, 100);
+
+            var playerUid = _entMan.SpawnEntity(null, _mapCoords);
+
+            // Attach player.
+            var session = sPlayerMan.Sessions.First();
+            server.PlayerMan.SetAttachedEntity(session, playerUid);
+            sPlayerMan.JoinGame(session);
+
+            // Next, we will spawn our test entity. This entity will have a  complex transform/container hierarchy.
+            // This is intended to be representative of a typical SS14 player entity, with organs. clothing, and a full backpack.
+            _ent = _entMan.Spawn();
+
+            // Quick check that SetCoordinates actually changes the parent as expected
+            // I.e., ensure that grid-traversal code doesn't just dump the entity on the map.
+            _transform.SetCoordinates(_ent, _gridCoords);
+            if (_query.GetComponent(_ent).ParentUid != _gridCoords.EntityId)
+                throw new Exception("Grid traversal error.");
+
+            _transform.SetCoordinates(_ent, _mapCoords);
+            if (_query.GetComponent(_ent).ParentUid != _mapCoords.EntityId)
+                throw new Exception("Grid traversal error.");
+
+            // Add 5 direct children in slots to represent clothing.
+            for (var i = 0; i < 5; i++)
+            {
+                var id = $"inventory{i}";
+                _container.EnsureContainer<ContainerSlot>(_ent, id);
+                if (!_entMan.TrySpawnInContainer(null, _ent, id, out _))
+                    throw new Exception($"Failed to setup entity");
+            }
+
+            // body parts
+            _container.EnsureContainer<Container>(_ent, "body");
+            for (var i = 0; i < 5; i++)
+            {
+                // Simple organ
+                if (!_entMan.TrySpawnInContainer(null, _ent, "body", out _))
+                    throw new Exception($"Failed to setup entity");
+
+                // body part that has another body part / limb
+                if (!_entMan.TrySpawnInContainer(null, _ent, "body", out var limb))
+                    throw new Exception($"Failed to setup entity");
+
+                _container.EnsureContainer<ContainerSlot>(limb.Value, "limb");
+                if (!_entMan.TrySpawnInContainer(null, limb.Value, "limb", out _))
+                    throw new Exception($"Failed to setup entity");
+            }
+
+            // Backpack
+            _container.EnsureContainer<ContainerSlot>(_ent, "inventory-backpack");
+            if (!_entMan.TrySpawnInContainer(null, _ent, "inventory-backpack", out var backpack))
+                throw new Exception($"Failed to setup entity");
+
+            // Misc backpack contents.
+            var backpackStorage = _container.EnsureContainer<Container>(backpack.Value, "storage");
+            for (var i = 0; i < 10; i++)
+            {
+                if (!_entMan.TrySpawnInContainer(null, backpack.Value, "storage", out _))
+                    throw new Exception($"Failed to setup entity");
+            }
+
+            // Emergency box inside of the backpack
+            var box = backpackStorage.ContainedEntities.First();
+            var boxContainer = _container.EnsureContainer<Container>(box, "storage");
+            for (var i = 0; i < 10; i++)
+            {
+                if (!_entMan.TrySpawnInContainer(null, box, "storage", out _))
+                    throw new Exception($"Failed to setup entity");
+            }
+
+            // Deepest child.
+            _child = boxContainer.ContainedEntities.First();
+            _childXform = _query.GetComponent(_child);
+
+            _players = new[] {session};
+            _session = _pvs.PlayerData[session];
+        }).Wait();
+
+        for (int i = 0; i < 10; i++)
+        {
+            server.WaitRunTicks(1).Wait();
+            client.WaitRunTicks(1).Wait();
+        }
+
+        PvsTick();
+        PvsTick();
+    }
+
+    private void PvsTick()
+    {
+        _session.ClearState();
+        _pvs.CacheSessionData(_players);
+        _pvs.GetVisibleChunks();
+        _pvs.ProcessVisibleChunksSequential();
+    }
+
+    /// <summary>
+    /// This implicitly measures move events, including PVS and entity lookups. Though given that most of the entities
+    /// are in containers, this will bias the entity lookup aspect.
+    /// </summary>
+    [Benchmark]
+    public void MoveEntity()
+    {
+        _transform.SetCoordinates(_ent, _gridCoords);
+        _transform.SetCoordinates(_ent, _mapCoords);
+    }
+
+    [Benchmark]
+    public void MoveEntityASmidge()
+    {
+        _transform.SetCoordinates(_ent, _gridCoords);
+        _transform.SetCoordinates(_ent, _gridCoords2);
+    }
+
+    /// <summary>
+    /// Like <see cref="MoveEntity"/>, but also processes queued PVS chunk updates.
+    /// </summary>
+    [Benchmark]
+    public void MoveAndUpdateChunks()
+    {
+        _transform.SetCoordinates(_ent, _gridCoords);
+        PvsTick();
+        _transform.SetCoordinates(_ent, _mapCoords);
+        PvsTick();
+    }
+
+    [Benchmark]
+    public void MoveASmidgeAndUpdateChunk()
+    {
+        _transform.SetCoordinates(_ent, _gridCoords);
+        PvsTick();
+        _transform.SetCoordinates(_ent, _gridCoords2);
+        PvsTick();
+    }
+
+    [Benchmark]
+    public Vector2 GetWorldPos()
+    {
+        return _transform.GetWorldPosition(_childXform);
+    }
+
+    [Benchmark]
+    public EntityUid GetRootUid()
+    {
+        var xform = _childXform;
+        while (xform.ParentUid.IsValid())
+        {
+            xform = _query.GetComponent(xform.ParentUid);
+        }
+        return xform.ParentUid;
+    }
+}

Robust.Client.Injectors/RXamlWellKnownTypes.cs

@@ -25,7 +25,7 @@ namespace Robust.Build.Tasks
             Single = ts.GetType("System.Single");
             Int32 = ts.GetType("System.Int32");
 
-            (Vector2, Vector2ConstructorFull) = GetNumericTypeInfo("Robust.Shared.Maths.Vector2", Single, 2);
+            (Vector2, Vector2ConstructorFull) = GetNumericTypeInfo("System.Numerics.Vector2", Single, 2);
             (Vector2i, Vector2iConstructorFull) = GetNumericTypeInfo("Robust.Shared.Maths.Vector2i", Int32, 2);
             (Thickness, ThicknessConstructorFull) = GetNumericTypeInfo("Robust.Shared.Maths.Thickness", Single, 4);
 

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

@@ -6,8 +6,8 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Microsoft.Build.Framework" Version="17.0.0" />
-      <PackageReference Include="Mono.Cecil" Version="0.11.3" />
+      <PackageReference Include="Microsoft.Build.Framework" Version="17.8.3" />
+      <PackageReference Include="Mono.Cecil" Version="0.11.5" />
       <PackageReference Include="Pidgin" Version="2.5.0" />
     </ItemGroup>
 

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

@@ -1,18 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-    <PropertyGroup>
-        <TargetFramework>netstandard2.0</TargetFramework>
-    </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" PrivateAssets="all" />
-  </ItemGroup>
-
   <ItemGroup>
     <Compile Link="XamlX\filename" Include="../XamlX/src/XamlX/**/*.cs" />
     <Compile Remove="../XamlX/src/XamlX/**/SreTypeSystem.cs" />
     <Compile Remove="../XamlX/src/XamlX/obj/**" />
     <Compile Include="..\Robust.Client\UserInterface\ControlPropertyAccess.cs" />
   </ItemGroup>
+
+  <Import Project="../Robust.Roslyn.Shared/Robust.Roslyn.Shared.props" />
+
+  <PropertyGroup>
+    <!-- XamlX doesn't do NRTs. -->
+    <Nullable>disable</Nullable>
+  </PropertyGroup>
+
 </Project>

Robust.Client.WebView/Cef/BaseRobustCefClient.cs

@@ -0,0 +1,85 @@
+using Xilium.CefGlue;
+
+namespace Robust.Client.WebView.Cef;
+
+/// <summary>
+/// Shared functionality for all <see cref="CefClient"/> implementations.
+/// </summary>
+/// <remarks>
+/// Locks down a bunch of CEF functionality we absolutely do not need content to do right now.
+/// </remarks>
+internal abstract class BaseRobustCefClient : CefClient
+{
+    private readonly RobustCefPrintHandler _printHandler = new();
+    private readonly RobustCefPermissionHandler _permissionHandler = new();
+    private readonly RobustCefDialogHandler _dialogHandler = new();
+    private readonly RobustCefDragHandler _dragHandler = new();
+
+    protected override CefPrintHandler GetPrintHandler() => _printHandler;
+    protected override CefPermissionHandler GetPermissionHandler() => _permissionHandler;
+    protected override CefDialogHandler GetDialogHandler() => _dialogHandler;
+    protected override CefDragHandler GetDragHandler() => _dragHandler;
+
+    private sealed class RobustCefPrintHandler : CefPrintHandler
+    {
+        protected override void OnPrintSettings(CefBrowser browser, CefPrintSettings settings, bool getDefaults)
+        {
+        }
+
+        protected override bool OnPrintDialog(CefBrowser browser, bool hasSelection, CefPrintDialogCallback callback)
+        {
+            return false;
+        }
+
+        protected override bool OnPrintJob(CefBrowser browser, string documentName, string pdfFilePath, CefPrintJobCallback callback)
+        {
+            return false;
+        }
+
+        protected override void OnPrintReset(CefBrowser browser)
+        {
+        }
+    }
+
+    private sealed class RobustCefPermissionHandler : CefPermissionHandler
+    {
+        protected override bool OnRequestMediaAccessPermission(
+            CefBrowser browser,
+            CefFrame frame,
+            string requestingOrigin,
+            CefMediaAccessPermissionTypes requestedPermissions,
+            CefMediaAccessCallback callback)
+        {
+            callback.Cancel();
+
+            return true;
+        }
+    }
+
+    private sealed class RobustCefDialogHandler : CefDialogHandler
+    {
+        protected override bool OnFileDialog(
+            CefBrowser browser,
+            CefFileDialogMode mode,
+            string title,
+            string defaultFilePath,
+            string[] acceptFilters,
+            CefFileDialogCallback callback)
+        {
+            callback.Cancel();
+            return true;
+        }
+    }
+
+    private sealed class RobustCefDragHandler : CefDragHandler
+    {
+        protected override bool OnDragEnter(CefBrowser browser, CefDragData dragData, CefDragOperationsMask mask)
+        {
+            return true;
+        }
+
+        protected override void OnDraggableRegionsChanged(CefBrowser browser, CefFrame frame, CefDraggableRegion[] regions)
+        {
+        }
+    }
+}

Robust.Client.WebView/Cef/Program.cs

@@ -1,4 +1,7 @@
 using System;
+using System.Diagnostics;
+using System.Globalization;
+using System.Threading;
 using Xilium.CefGlue;
 
 namespace Robust.Client.WebView.Cef
@@ -19,6 +22,8 @@ namespace Robust.Client.WebView.Cef
 
             var mainArgs = new CefMainArgs(argv);
 
+            StartWatchThread();
+
             // This will block executing until the subprocess is shut down.
             var code = CefRuntime.ExecuteProcess(mainArgs, new RobustCefApp(null), IntPtr.Zero);
 
@@ -29,5 +34,44 @@ namespace Robust.Client.WebView.Cef
 
             return code;
         }
+
+        private static void StartWatchThread()
+        {
+            //
+            // CEF has this nasty habit of not shutting down all its processes if the parent crashes.
+            // Great!
+            //
+            // We use a separate thread in each CEF child process to watch the main PID.
+            // If it exits, we kill ourselves after a couple seconds.
+            //
+
+            if (Environment.GetEnvironmentVariable("ROBUST_CEF_BROWSER_PROCESS_ID") is not { } parentIdString)
+                return;
+
+            if (Environment.GetEnvironmentVariable("ROBUST_CEF_BROWSER_PROCESS_MODULE") is not { } parentModuleString)
+                return;
+
+            if (!int.TryParse(parentIdString, CultureInfo.InvariantCulture, out var parentId))
+                return;
+
+            var process = Process.GetProcessById(parentId);
+            if ((process.MainModule?.FileName ?? "") != parentModuleString)
+            {
+                process.Dispose();
+                return;
+            }
+
+            new Thread(() => WatchThread(process)) { Name = "CEF Watch Thread", IsBackground = true }
+                .Start();
+        }
+
+        private static void WatchThread(Process p)
+        {
+            p.WaitForExit();
+
+            Thread.Sleep(3000);
+
+            Environment.Exit(1);
+        }
     }
 }

Robust.Client.WebView/Cef/RequestResults.cs

@@ -76,12 +76,9 @@ namespace Robust.Client.WebView.Cef
                 return true;
             }
 
-            protected override unsafe bool Read(IntPtr dataOut, int bytesToRead, out int bytesRead, CefResourceReadCallback callback)
+            protected override bool Read(Span<byte> response, out int bytesRead, CefResourceReadCallback callback)
             {
-                var byteSpan = new Span<byte>((void*) dataOut, bytesToRead);
-
-                bytesRead = _stream.Read(byteSpan);
-
+                bytesRead = _stream.Read(response);
                 return bytesRead != 0;
             }
 

Robust.Client.WebView/Cef/RobustCefApp.cs

@@ -31,10 +31,12 @@ namespace Robust.Client.WebView.Cef
             // Disable zygote on Linux.
             commandLine.AppendSwitch("--no-zygote");
 
-            // Work around https://bitbucket.org/chromiumembedded/cef/issues/3213/ozone-egl-initialization-does-not-have
+            // Work around https://github.com/chromiumembedded/cef/issues/3213
             // Desktop GL force makes Chromium not try to load its own ANGLE/Swiftshader so load paths aren't problematic.
-            if (OperatingSystem.IsLinux())
-                commandLine.AppendSwitch("--use-gl", "desktop");
+            // UPDATE: That bug got fixed and now this workaround breaks CEF.
+            // Keeping all this comment history in case I ever wanan remember what the `--use-gl` flag is.
+            //if (OperatingSystem.IsLinux())
+            //    commandLine.AppendSwitch("--use-gl", "desktop");
 
             // commandLine.AppendSwitch("--single-process");
 

Robust.Client.WebView/Cef/RobustCefClient.cs

@@ -3,7 +3,7 @@ using Xilium.CefGlue;
 namespace Robust.Client.WebView.Cef
 {
     // Simple CEF client.
-    internal sealed class RobustCefClient : CefClient
+    internal sealed class RobustCefClient : BaseRobustCefClient
     {
         private readonly CefRenderHandler _renderHandler;
         private readonly CefRequestHandler _requestHandler;

Robust.Client.WebView/Cef/WebViewManagerCef.BrowserWindow.cs

@@ -150,7 +150,7 @@ namespace Robust.Client.WebView.Cef
             }
         }
 
-        private sealed class WindowCefClient : CefClient
+        private sealed class WindowCefClient : BaseRobustCefClient
         {
             private readonly CefLifeSpanHandler _lifeSpanHandler;
             private readonly CefRequestHandler _requestHandler;

Robust.Client.WebView/Cef/WebViewManagerCef.Control.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Numerics;
 using Robust.Client.Graphics;
 using Robust.Client.Input;
 using Robust.Client.UserInterface;

Robust.Client.WebView/Cef/WebViewManagerCef.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.IO;
 using System.Net;
 using System.Reflection;
@@ -85,12 +86,14 @@ namespace Robust.Client.WebView.Cef
 
             _app = new RobustCefApp(_sawmill);
 
-            // We pass no main arguments...
-            CefRuntime.Initialize(new CefMainArgs(null), settings, _app, IntPtr.Zero);
+            var process = Process.GetCurrentProcess();
+            Environment.SetEnvironmentVariable("ROBUST_CEF_BROWSER_PROCESS_ID", process.Id.ToString());
+            Environment.SetEnvironmentVariable("ROBUST_CEF_BROWSER_PROCESS_MODULE", process.MainModule?.FileName ?? "");
 
-            // TODO CEF: After this point, debugging breaks. No, literally. My client crashes but ONLY with the debugger.
-            // I have tried using the DEBUG and RELEASE versions of libcef.so, stripped or non-stripped...
-            // And nothing seemed to work. Odd.
+            // So these arguments look like nonsense, but it turns out CEF is just *like that*.
+            // The first argument is literally nonsense, but it needs to be there as otherwise the second argument doesn't apply
+            // The second argument turns off CEF's bullshit error handling, which breaks dotnet's error handling.
+            CefRuntime.Initialize(new CefMainArgs(new string[]{"binary","--disable-in-process-stack-traces"}), settings, _app, IntPtr.Zero);
 
             if (_cfg.GetCVar(WCVars.WebResProtocol))
             {

Robust.Client.WebView/Robust.Client.WebView.csproj

@@ -8,8 +8,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="JetBrains.Annotations" Version="2020.3.0" />
-    <PackageReference Include="Robust.Natives.Cef" Version="102.0.9" />
+    <PackageReference Include="JetBrains.Annotations" />
+    <PackageReference Include="Robust.Natives.Cef" />
   </ItemGroup>
 
   <ItemGroup>

Robust.Client.WebView/TestBrowseWindow.cs

@@ -0,0 +1,28 @@
+using System.Numerics;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Shared.Console;
+
+namespace Robust.Client.WebView;
+
+internal sealed class TestBrowseWindow : DefaultWindow
+{
+    protected override Vector2 ContentsMinimumSize => new Vector2(640, 480);
+
+    public TestBrowseWindow()
+    {
+        var wv = new WebViewControl();
+        wv.Url = "https://spacestation14.io";
+
+        Contents.AddChild(wv);
+    }
+}
+
+internal sealed class TestBrowseWindowCommand : LocalizedCommands
+{
+    public override string Command => "test_browse_window";
+
+    public override void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        new TestBrowseWindow().Open();
+    }
+}

Robust.Client.WebView/WebViewManager.cs

@@ -5,6 +5,7 @@ using Robust.Client.WebView.Headless;
 using Robust.Client.WebViewHook;
 using Robust.Shared.Configuration;
 using Robust.Shared.IoC;
+using Robust.Shared.Reflection;
 using Robust.Shared.Utility;
 
 [assembly: WebViewManagerImpl(typeof(WebViewManager))]
@@ -22,6 +23,9 @@ namespace Robust.Client.WebView
             var cfg = dependencies.Resolve<IConfigurationManagerInternal>();
             cfg.LoadCVarsFromAssembly(typeof(WebViewManager).Assembly);
 
+            var refl = dependencies.Resolve<IReflectionManager>();
+            refl.LoadAssemblies(typeof(WebViewManager).Assembly);
+
             dependencies.RegisterInstance<IWebViewManager>(this);
             dependencies.RegisterInstance<IWebViewManagerInternal>(this);
 

Robust.Client/Animations/AnimationTrackPlaySound.cs

@@ -1,8 +1,10 @@
 using System;
 using System.Collections.Generic;
+using Robust.Client.Audio;
 using Robust.Client.GameObjects;
 using Robust.Shared.Audio;
 using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
 using Robust.Shared.Player;
 
 namespace Robust.Client.Animations
@@ -37,7 +39,12 @@ namespace Robust.Client.Animations
 
                 var keyFrame = KeyFrames[keyFrameIndex];
 
-                SoundSystem.Play(keyFrame.Resource, Filter.Local(), entity, keyFrame.AudioParamsFunc.Invoke());
+                var audioParams = keyFrame.AudioParamsFunc.Invoke();
+                var audio = new SoundPathSpecifier(keyFrame.Resource)
+                {
+                    Params = audioParams
+                };
+                IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<AudioSystem>().PlayEntity(audio, Filter.Local(), entity, true);
             }
 
             return (keyFrameIndex, playingTime);

Robust.Client/Animations/AnimationTrackProperty.cs

@@ -1,7 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.Numerics;
 using Robust.Shared.Animations;
 using Robust.Shared.Maths;
+using Vector3 = Robust.Shared.Maths.Vector3;
+using Vector4 = Robust.Shared.Maths.Vector4;
 
 namespace Robust.Client.Animations
 {
@@ -117,7 +120,7 @@ namespace Robust.Client.Animations
             switch (a)
             {
                 case Vector2 vector2:
-                    return Vector2.InterpolateCubic((Vector2) preA, vector2, (Vector2) b, (Vector2) postB, t);
+                    return Vector2Helpers.InterpolateCubic((Vector2) preA, vector2, (Vector2) b, (Vector2) postB, t);
                 case Vector3 vector3:
                     return Vector3.InterpolateCubic((Vector3) preA, vector3, (Vector3) b, (Vector3) postB, t);
                 case Vector4 vector4:

Robust.Client/Audio/AudioManager.ALDisposeQueues.cs

@@ -0,0 +1,58 @@
+using System.Collections.Concurrent;
+using OpenTK.Audio.OpenAL;
+
+namespace Robust.Client.Audio;
+
+internal partial class AudioManager
+{
+    // Used to track audio sources that were disposed in the finalizer thread,
+    // so we need to properly send them off in the main thread.
+    private readonly ConcurrentQueue<(int sourceHandle, int filterHandle)> _sourceDisposeQueue = new();
+    private readonly ConcurrentQueue<(int sourceHandle, int filterHandle)> _bufferedSourceDisposeQueue = new();
+    private readonly ConcurrentQueue<int> _bufferDisposeQueue = new();
+
+    public void FlushALDisposeQueues()
+    {
+        // Clear out finalized audio sources.
+        while (_sourceDisposeQueue.TryDequeue(out var handles))
+        {
+            OpenALSawmill.Debug("Cleaning out source {0} which finalized in another thread.", handles.sourceHandle);
+            if (IsEfxSupported) RemoveEfx(handles);
+            AL.DeleteSource(handles.sourceHandle);
+            _checkAlError();
+            _audioSources.Remove(handles.sourceHandle);
+        }
+
+        // Clear out finalized buffered audio sources.
+        while (_bufferedSourceDisposeQueue.TryDequeue(out var handles))
+        {
+            OpenALSawmill.Debug("Cleaning out buffered source {0} which finalized in another thread.", handles.sourceHandle);
+            if (IsEfxSupported) RemoveEfx(handles);
+            AL.DeleteSource(handles.sourceHandle);
+            _checkAlError();
+            _bufferedAudioSources.Remove(handles.sourceHandle);
+        }
+
+        // Clear out finalized audio buffers.
+        while (_bufferDisposeQueue.TryDequeue(out var handle))
+        {
+            AL.DeleteBuffer(handle);
+            _checkAlError();
+        }
+    }
+
+    internal void DeleteSourceOnMainThread(int sourceHandle, int filterHandle)
+    {
+        _sourceDisposeQueue.Enqueue((sourceHandle, filterHandle));
+    }
+
+    internal void DeleteBufferedSourceOnMainThread(int bufferedSourceHandle, int filterHandle)
+    {
+        _bufferedSourceDisposeQueue.Enqueue((bufferedSourceHandle, filterHandle));
+    }
+
+    internal void DeleteAudioBufferOnMainThread(int bufferHandle)
+    {
+        _bufferDisposeQueue.Enqueue(bufferHandle);
+    }
+}

Robust.Client/Audio/AudioManager.Public.cs

@@ -0,0 +1,374 @@
+using System;
+using System.IO;
+using System.Numerics;
+using System.Threading;
+using OpenTK.Audio.OpenAL;
+using Robust.Client.Audio.Sources;
+using Robust.Client.Graphics;
+using Robust.Shared.Audio;
+using Robust.Shared.Audio.AudioLoading;
+using Robust.Shared.Audio.Sources;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.Audio;
+
+internal partial class AudioManager
+{
+    private float _zOffset;
+
+    public void SetZOffset(float offset)
+    {
+        _zOffset = offset;
+    }
+
+    /// <inheritdoc />
+    public float GetAttenuationGain(float distance, float rolloffFactor, float referenceDistance, float maxDistance)
+    {
+        switch (_attenuation)
+        {
+            case Attenuation.LinearDistance:
+                return 1 - rolloffFactor * (distance - referenceDistance) / (maxDistance - referenceDistance);
+            case Attenuation.LinearDistanceClamped:
+                distance = MathF.Max(referenceDistance, MathF.Min(distance, maxDistance));
+                return 1 - rolloffFactor * (distance - referenceDistance) / (maxDistance - referenceDistance);
+            default:
+                // TODO: If you see this you can implement
+                throw new NotImplementedException();
+        }
+    }
+
+    public void InitializePostWindowing()
+    {
+        _gameThread = Thread.CurrentThread;
+        InitializeAudio();
+    }
+
+    public void Shutdown()
+    {
+        DisposeAllAudio();
+
+        if (_openALContext != ALContext.Null)
+        {
+            ALC.MakeContextCurrent(ALContext.Null);
+
+            ALC.DestroyContext(_openALContext);
+        }
+
+        if (_openALDevice != IntPtr.Zero)
+        {
+            ALC.CloseDevice(_openALDevice);
+        }
+    }
+
+    /// <inheritdoc/>
+    public void SetVelocity(Vector2 velocity)
+    {
+        AL.Listener(ALListener3f.Velocity, velocity.X, velocity.Y, 0f);
+    }
+
+    /// <inheritdoc/>
+    public void SetPosition(Vector2 position)
+    {
+        AL.Listener(ALListener3f.Position, position.X, position.Y, _zOffset);
+    }
+
+    /// <inheritdoc/>
+    public void SetRotation(Angle angle)
+    {
+        var vec = angle.ToVec();
+
+        // Default orientation: at: (0, 0, -1)  up: (0, 1, 0)
+        var at = new OpenTK.Mathematics.Vector3(0f, 0f, -1f);
+        var up = new OpenTK.Mathematics.Vector3(vec.Y, vec.X, 0f);
+        AL.Listener(ALListenerfv.Orientation, new []{0, 0, -1, vec.X, vec.Y, 0});
+        AL.Listener(ALListenerfv.Orientation, ref at, ref up);
+    }
+
+    /// <inheritdoc/>
+    public AudioStream LoadAudioOggVorbis(Stream stream, string? name = null)
+    {
+        var vorbis = AudioLoaderOgg.LoadAudioData(stream);
+
+        var buffer = AL.GenBuffer();
+
+        ALFormat format;
+        // NVorbis only supports loading into floats.
+        // If this becomes a problem due to missing extension support (doubt it but ok),
+        // check the git history, I originally used libvorbisfile which worked and loaded 16 bit LPCM.
+        if (vorbis.Channels == 1)
+        {
+            format = ALFormat.Mono16;
+        }
+        else if (vorbis.Channels == 2)
+        {
+            format = ALFormat.Stereo16;
+        }
+        else
+        {
+            throw new InvalidOperationException("Unable to load audio with more than 2 channels.");
+        }
+
+        unsafe
+        {
+            fixed (short* ptr = vorbis.Data.Span)
+            {
+                AL.BufferData(buffer, format, (IntPtr) ptr, vorbis.Data.Length * sizeof(short),
+                    (int) vorbis.SampleRate);
+            }
+        }
+
+        _checkAlError();
+
+        var handle = new ClydeHandle(_audioSampleBuffers.Count);
+        _audioSampleBuffers.Add(new LoadedAudioSample(buffer));
+        var length = TimeSpan.FromSeconds(vorbis.TotalSamples / (double) vorbis.SampleRate);
+        return new AudioStream(handle, length, (int) vorbis.Channels, name, vorbis.Title, vorbis.Artist);
+    }
+
+    /// <inheritdoc/>
+    public AudioStream LoadAudioWav(Stream stream, string? name = null)
+    {
+        var wav = AudioLoaderWav.LoadAudioData(stream);
+
+        var buffer = AL.GenBuffer();
+
+        ALFormat format;
+        if (wav.BitsPerSample == 16)
+        {
+            if (wav.NumChannels == 1)
+            {
+                format = ALFormat.Mono16;
+            }
+            else if (wav.NumChannels == 2)
+            {
+                format = ALFormat.Stereo16;
+            }
+            else
+            {
+                throw new InvalidOperationException("Unable to load audio with more than 2 channels.");
+            }
+        }
+        else if (wav.BitsPerSample == 8)
+        {
+            if (wav.NumChannels == 1)
+            {
+                format = ALFormat.Mono8;
+            }
+            else if (wav.NumChannels == 2)
+            {
+                format = ALFormat.Stereo8;
+            }
+            else
+            {
+                throw new InvalidOperationException("Unable to load audio with more than 2 channels.");
+            }
+        }
+        else
+        {
+            throw new InvalidOperationException("Unable to load wav with bits per sample different from 8 or 16");
+        }
+
+        unsafe
+        {
+            fixed (byte* ptr = wav.Data.Span)
+            {
+                AL.BufferData(buffer, format, (IntPtr) ptr, wav.Data.Length, wav.SampleRate);
+            }
+        }
+
+        _checkAlError();
+
+        var handle = new ClydeHandle(_audioSampleBuffers.Count);
+        _audioSampleBuffers.Add(new LoadedAudioSample(buffer));
+        var length = TimeSpan.FromSeconds(wav.Data.Length / (double) wav.BlockAlign / wav.SampleRate);
+        return new AudioStream(handle, length, wav.NumChannels, name);
+    }
+
+    /// <inheritdoc/>
+    public AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null)
+    {
+        var fmt = channels switch
+        {
+            1 => ALFormat.Mono16,
+            2 => ALFormat.Stereo16,
+            _ => throw new ArgumentOutOfRangeException(
+                nameof(channels), "Only stereo and mono is currently supported")
+        };
+
+        var buffer = AL.GenBuffer();
+        _checkAlError();
+
+        unsafe
+        {
+            fixed (short* ptr = samples)
+            {
+                AL.BufferData(buffer, fmt, (IntPtr) ptr, samples.Length * sizeof(short), sampleRate);
+            }
+        }
+
+        _checkAlError();
+
+        var handle = new ClydeHandle(_audioSampleBuffers.Count);
+        var length = TimeSpan.FromSeconds((double) samples.Length / channels / sampleRate);
+        _audioSampleBuffers.Add(new LoadedAudioSample(buffer));
+        return new AudioStream(handle, length, channels, name);
+    }
+
+    public void SetMasterGain(float newGain)
+    {
+        if (newGain < 0f)
+        {
+            OpenALSawmill.Error("Tried to set master gain below 0, clamping to 0");
+            AL.Listener(ALListenerf.Gain, 0f);
+            return;
+        }
+
+
+        #region Platform hack for MacOS
+        // HACK/BUG: Apple's OpenAL implementation has a bug where values of 0f for listener gain don't actually
+        // HACK/BUG: prevent sound playback. Workaround is to cap the minimum gain at a value just above 0.
+        if (OperatingSystem.IsMacOS() && newGain == 0f)
+        {
+            OpenALSawmill.Verbose("Not setting gain to 0 because Apple can't write an OpenAL implementation");
+            AL.Listener(ALListenerf.Gain, float.Epsilon);
+            return;
+        }
+        #endregion Platform hack for MacOS
+
+        AL.Listener(ALListenerf.Gain, newGain);
+    }
+
+    public void SetAttenuation(Attenuation attenuation)
+    {
+        switch (attenuation)
+        {
+            case Attenuation.NoAttenuation:
+                AL.DistanceModel(ALDistanceModel.None);
+                break;
+            case Attenuation.InverseDistance:
+                AL.DistanceModel(ALDistanceModel.InverseDistance);
+                break;
+            case Attenuation.InverseDistanceClamped:
+                AL.DistanceModel(ALDistanceModel.InverseDistanceClamped);
+                break;
+            case Attenuation.LinearDistance:
+                AL.DistanceModel(ALDistanceModel.LinearDistance);
+                break;
+            case Attenuation.LinearDistanceClamped:
+                AL.DistanceModel(ALDistanceModel.LinearDistanceClamped);
+                break;
+            case Attenuation.ExponentDistance:
+                AL.DistanceModel(ALDistanceModel.ExponentDistance);
+                break;
+            case Attenuation.ExponentDistanceClamped:
+                AL.DistanceModel(ALDistanceModel.ExponentDistanceClamped);
+                break;
+            default:
+                throw new ArgumentOutOfRangeException($"No implementation to set {attenuation.ToString()} for DistanceModel!");
+        }
+
+        _attenuation = attenuation;
+        OpenALSawmill.Info($"Set audio attenuation to {attenuation.ToString()}");
+    }
+
+    internal void RemoveAudioSource(int handle)
+    {
+        _audioSources.Remove(handle);
+    }
+
+    internal void RemoveBufferedAudioSource(int handle)
+    {
+        _bufferedAudioSources.Remove(handle);
+    }
+
+    public IAudioSource? CreateAudioSource(AudioStream stream)
+    {
+        var source = AL.GenSource();
+
+        if (!AL.IsSource(source))
+        {
+            OpenALSawmill.Error("Failed to generate source. Too many simultaneous audio streams? {0}", Environment.StackTrace);
+            return null;
+        }
+
+        // ReSharper disable once PossibleInvalidOperationException
+        // TODO: This really shouldn't be indexing based on the ClydeHandle...
+        AL.Source(source, ALSourcei.Buffer, _audioSampleBuffers[(int) stream.ClydeHandle!.Value].BufferHandle);
+
+        var audioSource = new AudioSource(this, source, stream);
+        _audioSources.Add(source, new WeakReference<BaseAudioSource>(audioSource));
+        ApplyDefaultParams(audioSource);
+        return audioSource;
+    }
+
+    /// <inheritdoc/>
+    IBufferedAudioSource? IAudioInternal.CreateBufferedAudioSource(int buffers, bool floatAudio=false)
+    {
+        var source = AL.GenSource();
+
+        if (!AL.IsSource(source))
+        {
+            OpenALSawmill.Error("Failed to generate source. Too many simultaneous audio streams? {0}", Environment.StackTrace);
+            return null;
+        }
+
+        // ReSharper disable once PossibleInvalidOperationException
+
+        var audioSource = new BufferedAudioSource(this, source, AL.GenBuffers(buffers), floatAudio);
+        _bufferedAudioSources.Add(source, new WeakReference<BufferedAudioSource>(audioSource));
+        ApplyDefaultParams(audioSource);
+        return audioSource;
+    }
+
+    private void ApplyDefaultParams(IAudioSource source)
+    {
+        source.MaxDistance = AudioParams.Default.MaxDistance;
+        source.Pitch = AudioParams.Default.Pitch;
+        source.ReferenceDistance = AudioParams.Default.ReferenceDistance;
+        source.RolloffFactor = AudioParams.Default.RolloffFactor;
+    }
+
+    /// <inheritdoc />
+    public void StopAllAudio()
+    {
+        foreach (var source in _audioSources.Values)
+        {
+            if (source.TryGetTarget(out var target))
+            {
+                target.Playing = false;
+            }
+        }
+
+        foreach (var source in _bufferedAudioSources.Values)
+        {
+            if (source.TryGetTarget(out var target))
+            {
+                target.Playing = false;
+            }
+        }
+    }
+
+    public void DisposeAllAudio()
+    {
+        // TODO: Do we even need to stop?
+        foreach (var source in _audioSources.Values)
+        {
+            if (source.TryGetTarget(out var target))
+            {
+                target.Dispose();
+            }
+        }
+
+        _audioSources.Clear();
+
+        foreach (var source in _bufferedAudioSources.Values)
+        {
+            if (source.TryGetTarget(out var target))
+            {
+                target.Dispose();
+            }
+        }
+
+        _bufferedAudioSources.Clear();
+    }
+}

Robust.Client/Audio/AudioManager.cs

@@ -0,0 +1,173 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using OpenTK.Audio.OpenAL;
+using OpenTK.Audio.OpenAL.Extensions.Creative.EFX;
+using Robust.Client.Audio.Sources;
+using Robust.Shared;
+using Robust.Shared.Audio;
+using Robust.Shared.Configuration;
+using Robust.Shared.Log;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.Audio;
+
+internal sealed partial class AudioManager : IAudioInternal
+{
+    [Shared.IoC.Dependency] private readonly IConfigurationManager _cfg = default!;
+    [Shared.IoC.Dependency] private readonly ILogManager _logMan = default!;
+
+    private Thread? _gameThread;
+
+    private ALDevice _openALDevice;
+    private ALContext _openALContext;
+
+    private readonly List<LoadedAudioSample> _audioSampleBuffers = new();
+
+    private readonly Dictionary<int, WeakReference<BaseAudioSource>> _audioSources =
+        new();
+
+    private readonly Dictionary<int, WeakReference<BufferedAudioSource>> _bufferedAudioSources =
+        new();
+
+    private readonly HashSet<string> _alcDeviceExtensions = new();
+    private readonly HashSet<string> _alContextExtensions = new();
+    private Attenuation _attenuation;
+
+    public bool HasAlDeviceExtension(string extension) => _alcDeviceExtensions.Contains(extension);
+    public bool HasAlContextExtension(string extension) => _alContextExtensions.Contains(extension);
+
+    internal bool IsEfxSupported;
+
+    internal ISawmill OpenALSawmill = default!;
+
+    private void _audioCreateContext()
+    {
+        unsafe
+        {
+            _openALContext = ALC.CreateContext(_openALDevice, (int*) 0);
+        }
+
+        ALC.MakeContextCurrent(_openALContext);
+        _checkAlcError(_openALDevice);
+        _checkAlError();
+
+        // Load up AL context extensions.
+        var s = ALC.GetString(ALDevice.Null, AlcGetString.Extensions) ?? "";
+        foreach (var extension in s.Split(' '))
+        {
+            _alContextExtensions.Add(extension);
+        }
+
+        OpenALSawmill.Debug("OpenAL Vendor: {0}", AL.Get(ALGetString.Vendor));
+        OpenALSawmill.Debug("OpenAL Renderer: {0}", AL.Get(ALGetString.Renderer));
+        OpenALSawmill.Debug("OpenAL Version: {0}", AL.Get(ALGetString.Version));
+    }
+
+    private bool _audioOpenDevice()
+    {
+        var preferredDevice = _cfg.GetCVar(CVars.AudioDevice);
+
+        // Open device.
+        if (!string.IsNullOrEmpty(preferredDevice))
+        {
+            _openALDevice = ALC.OpenDevice(preferredDevice);
+            if (_openALDevice == IntPtr.Zero)
+            {
+                OpenALSawmill.Warning("Unable to open preferred audio device '{0}': {1}. Falling back default.",
+                    preferredDevice, ALC.GetError(ALDevice.Null));
+
+                _openALDevice = ALC.OpenDevice(null);
+            }
+        }
+        else
+        {
+            _openALDevice = ALC.OpenDevice(null);
+        }
+
+        _checkAlcError(_openALDevice);
+
+        if (_openALDevice == IntPtr.Zero)
+        {
+            OpenALSawmill.Error("Unable to open OpenAL device! {1}", ALC.GetError(ALDevice.Null));
+            return false;
+        }
+
+        // Load up ALC extensions.
+        var s = ALC.GetString(_openALDevice, AlcGetString.Extensions) ?? "";
+        foreach (var extension in s.Split(' '))
+        {
+            _alcDeviceExtensions.Add(extension);
+        }
+        return true;
+    }
+
+    private void InitializeAudio()
+    {
+        OpenALSawmill = _logMan.GetSawmill("clyde.oal");
+
+        if (!_audioOpenDevice())
+            return;
+
+        // Create OpenAL context.
+        _audioCreateContext();
+
+        IsEfxSupported = HasAlDeviceExtension("ALC_EXT_EFX");
+
+        _cfg.OnValueChanged(CVars.AudioMasterVolume, SetMasterGain, true);
+    }
+
+    internal bool IsMainThread()
+    {
+        return Thread.CurrentThread == _gameThread;
+    }
+
+    private static void RemoveEfx((int sourceHandle, int filterHandle) handles)
+    {
+        if (handles.filterHandle != 0)
+            EFX.DeleteFilter(handles.filterHandle);
+    }
+
+    private void _checkAlcError(ALDevice device,
+        [CallerMemberName] string callerMember = "",
+        [CallerLineNumber] int callerLineNumber = -1)
+    {
+        var error = ALC.GetError(device);
+        if (error != AlcError.NoError)
+        {
+            OpenALSawmill.Error("[{0}:{1}] ALC error: {2}", callerMember, callerLineNumber, error);
+        }
+    }
+
+    /// <summary>
+    /// Like _checkAlError but allows custom data to be passed in as relevant.
+    /// </summary>
+    internal void LogALError(string message, [CallerMemberName] string callerMember = "", [CallerLineNumber] int callerLineNumber = -1)
+    {
+        var error = AL.GetError();
+        if (error != ALError.NoError)
+        {
+            OpenALSawmill.Error("[{0}:{1}] AL error: {2}, {3}. Stacktrace is {4}", callerMember, callerLineNumber, error, message, Environment.StackTrace);
+        }
+    }
+
+    public void _checkAlError([CallerMemberName] string callerMember = "", [CallerLineNumber] int callerLineNumber = -1)
+    {
+        var error = AL.GetError();
+        if (error != ALError.NoError)
+        {
+            OpenALSawmill.Error("[{0}:{1}] AL error: {2}", callerMember, callerLineNumber, error);
+        }
+    }
+
+    private sealed class LoadedAudioSample
+    {
+        public readonly int BufferHandle;
+
+        public LoadedAudioSample(int bufferHandle)
+        {
+            BufferHandle = bufferHandle;
+        }
+    }
+}

Robust.Client/Audio/AudioOverlay.cs

@@ -0,0 +1,91 @@
+using System.Numerics;
+using System.Text;
+using Robust.Client.GameObjects;
+using Robust.Client.Graphics;
+using Robust.Client.Player;
+using Robust.Client.ResourceManagement;
+using Robust.Shared.Audio;
+using Robust.Shared.Enums;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using AudioComponent = Robust.Shared.Audio.Components.AudioComponent;
+
+namespace Robust.Client.Audio;
+
+/// <summary>
+/// Debug overlay for audio.
+/// </summary>
+public sealed class AudioOverlay : Overlay
+{
+    public override OverlaySpace Space => OverlaySpace.ScreenSpace;
+
+    private IEntityManager _entManager;
+    private IPlayerManager _playerManager;
+    private AudioSystem _audio;
+    private SharedTransformSystem _transform;
+
+    private Font _font;
+
+    public AudioOverlay(IEntityManager entManager, IPlayerManager playerManager, IResourceCache cache, AudioSystem audio, SharedTransformSystem transform)
+    {
+        _entManager = entManager;
+        _playerManager = playerManager;
+        _audio = audio;
+        _transform = transform;
+
+        _font = new VectorFont(cache.GetResource<FontResource>("/Fonts/NotoSans/NotoSans-Regular.ttf"), 10);
+    }
+
+    protected internal override void Draw(in OverlayDrawArgs args)
+    {
+        var localPlayer = _playerManager.LocalEntity;
+
+        if (args.ViewportControl == null || localPlayer == null)
+            return;
+
+        var screenHandle = args.ScreenHandle;
+        var output = new StringBuilder();
+        var listenerPos = _entManager.GetComponent<TransformComponent>(localPlayer.Value).MapPosition;
+
+        if (listenerPos.MapId != args.MapId)
+            return;
+
+        var query = _entManager.AllEntityQueryEnumerator<AudioComponent>();
+
+        while (query.MoveNext(out var uid, out var comp))
+        {
+            var mapId = MapId.Nullspace;
+            var audioPos = Vector2.Zero;
+
+            if (_entManager.TryGetComponent<TransformComponent>(uid, out var xform))
+            {
+                mapId = xform.MapID;
+                audioPos = _transform.GetWorldPosition(uid);
+            }
+
+            if (mapId != args.MapId)
+                continue;
+
+            var screenPos = args.ViewportControl.WorldToScreen(audioPos);
+            var distance = audioPos - listenerPos.Position;
+            var posOcclusion = _audio.GetOcclusion(listenerPos, distance, distance.Length(), uid);
+
+            output.Clear();
+            output.AppendLine("Audio Source");
+            output.AppendLine("Runtime:");
+            output.AppendLine($"- Distance: {_audio.GetAudioDistance(distance.Length()):0.00}");
+            output.AppendLine($"- Occlusion: {posOcclusion:0.0000}");
+            output.AppendLine("Params:");
+            output.AppendLine($"- RolloffFactor: {comp.RolloffFactor:0.0000}");
+            output.AppendLine($"- Volume: {comp.Volume:0.0000}");
+            output.AppendLine($"- Reference distance: {comp.ReferenceDistance:0.00}");
+            output.AppendLine($"- Max distance: {comp.MaxDistance:0.00}");
+            var outputText = output.ToString().Trim();
+            var dimensions = screenHandle.GetDimensions(_font, outputText, 1f);
+            var buffer = new Vector2(3f, 3f);
+            screenHandle.DrawRect(new UIBox2(screenPos - buffer, screenPos + dimensions + buffer), new Color(39, 39, 48));
+            screenHandle.DrawString(_font, screenPos, outputText);
+        }
+    }
+}

Robust.Client/Audio/AudioStream.cs

@@ -1,20 +1,27 @@
-using System;
-using Robust.Client.Graphics;
+using System;
+using Robust.Shared.Graphics;
 
 namespace Robust.Client.Audio;
 
+/// <summary>
+/// Has the metadata for a particular audio stream as well as the relevant internal handle to it.
+/// </summary>
 public sealed class AudioStream
 {
     public TimeSpan Length { get; }
-    internal ClydeHandle? ClydeHandle { get; }
+    internal IClydeHandle? ClydeHandle { get; }
     public string? Name { get; }
+    public string? Title { get; }
+    public string? Artist { get; }
     public int ChannelCount { get; }
 
-    internal AudioStream(ClydeHandle handle, TimeSpan length, int channelCount, string? name = null)
+    internal AudioStream(IClydeHandle? handle, TimeSpan length, int channelCount, string? name = null, string? title = null, string? artist = null)
     {
         ClydeHandle = handle;
         Length = length;
         ChannelCount = channelCount;
         Name = name;
+        Title = title;
+        Artist = artist;
     }
 }

Robust.Client/Audio/AudioSystem.Effects.cs

@@ -0,0 +1,76 @@
+using OpenTK.Audio.OpenAL.Extensions.Creative.EFX;
+using Robust.Client.Audio.Effects;
+using Robust.Shared.Audio.Components;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Client.Audio;
+
+public sealed partial class AudioSystem
+{
+    protected override void InitializeEffect()
+    {
+        base.InitializeEffect();
+        SubscribeLocalEvent<AudioEffectComponent, ComponentAdd>(OnEffectAdd);
+        SubscribeLocalEvent<AudioEffectComponent, ComponentShutdown>(OnEffectShutdown);
+
+        SubscribeLocalEvent<AudioAuxiliaryComponent, ComponentAdd>(OnAuxiliaryAdd);
+        SubscribeLocalEvent<AudioAuxiliaryComponent, AfterAutoHandleStateEvent>(OnAuxiliaryAuto);
+    }
+
+    private void OnEffectAdd(EntityUid uid, AudioEffectComponent component, ComponentAdd args)
+    {
+        var effect = new AudioEffect(_audio);
+        component.Effect = effect;
+    }
+
+    private void OnEffectShutdown(EntityUid uid, AudioEffectComponent component, ComponentShutdown args)
+    {
+        if (component.Effect is AudioEffect effect)
+        {
+            effect.Dispose();
+        }
+    }
+
+    private void OnAuxiliaryAdd(EntityUid uid, AudioAuxiliaryComponent component, ComponentAdd args)
+    {
+        component.Auxiliary = new AuxiliaryAudio();
+    }
+
+    private void OnAuxiliaryAuto(EntityUid uid, AudioAuxiliaryComponent component, ref AfterAutoHandleStateEvent args)
+    {
+        if (TryComp<AudioEffectComponent>(component.Effect, out var effectComp))
+        {
+            component.Auxiliary.SetEffect(effectComp.Effect);
+        }
+        else
+        {
+            component.Auxiliary.SetEffect(null);
+        }
+    }
+
+    public override void SetAuxiliary(EntityUid uid, AudioComponent audio, EntityUid? auxUid)
+    {
+        base.SetAuxiliary(uid, audio, auxUid);
+        if (TryComp<AudioAuxiliaryComponent>(audio.Auxiliary, out var auxComp))
+        {
+            audio.Source.SetAuxiliary(auxComp.Auxiliary);
+        }
+        else
+        {
+            audio.Source.SetAuxiliary(null);
+        }
+    }
+
+    public override void SetEffect(EntityUid auxUid, AudioAuxiliaryComponent aux, EntityUid? effectUid)
+    {
+        base.SetEffect(auxUid, aux, effectUid);
+        if (TryComp<AudioEffectComponent>(aux.Effect, out var effectComp))
+        {
+            aux.Auxiliary.SetEffect(effectComp.Effect);
+        }
+        else
+        {
+            aux.Auxiliary.SetEffect(null);
+        }
+    }
+}

Robust.Client/Audio/AudioSystem.Limits.cs

@@ -0,0 +1,57 @@
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Robust.Shared;
+using Robust.Shared.GameObjects;
+
+namespace Robust.Client.Audio;
+
+public sealed partial class AudioSystem
+{
+    /*
+     * Handles limiting concurrent sounds for audio to avoid blowing the source budget on one sound getting spammed.
+     */
+
+    private readonly Dictionary<string, int> _playingCount = new();
+
+    private int _maxConcurrent;
+
+    private void InitializeLimit()
+    {
+        Subs.CVar(CfgManager, CVars.AudioDefaultConcurrent, SetConcurrentLimit, true);
+    }
+
+    private void SetConcurrentLimit(int obj)
+    {
+        _maxConcurrent = obj;
+    }
+
+    private bool TryAudioLimit(string sound)
+    {
+        if (string.IsNullOrEmpty(sound))
+            return true;
+
+        ref var count = ref CollectionsMarshal.GetValueRefOrAddDefault(_playingCount, sound, out _);
+
+        if (count >= _maxConcurrent)
+            return false;
+
+        count++;
+        return true;
+    }
+
+    private void RemoveAudioLimit(string sound)
+    {
+        if (!_playingCount.TryGetValue(sound, out var count))
+            return;
+
+        count--;
+
+        if (count <= 0)
+        {
+            _playingCount.Remove(sound);
+            return;
+        }
+
+        _playingCount[sound] = count;
+    }
+}

Robust.Client/Audio/AudioSystem.cs

@@ -0,0 +1,744 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Numerics;
+using Robust.Client.GameObjects;
+using Robust.Client.Graphics;
+using Robust.Client.Player;
+using Robust.Client.ResourceManagement;
+using Robust.Shared;
+using Robust.Shared.Audio;
+using Robust.Shared.Audio.Components;
+using Robust.Shared.Audio.Sources;
+using Robust.Shared.Audio.Systems;
+using Robust.Shared.Exceptions;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Map.Components;
+using Robust.Shared.Physics;
+using Robust.Shared.Physics.Components;
+using Robust.Shared.Physics.Systems;
+using Robust.Shared.Player;
+using Robust.Shared.Replays;
+using Robust.Shared.Threading;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.Audio;
+
+public sealed partial class AudioSystem : SharedAudioSystem
+{
+    /*
+     * There's still a lot more OpenAL can do in terms of filters, auxiliary slots, etc.
+     * but exposing the whole thing in an easy way is a lot of effort.
+     */
+
+    [Dependency] private readonly IPlayerManager _playerManager = default!;
+    [Dependency] private readonly IReplayRecordingManager _replayRecording = default!;
+    [Dependency] private readonly IEyeManager _eyeManager = default!;
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+    [Dependency] private readonly IMapManager _mapManager = default!;
+    [Dependency] private readonly IParallelManager _parMan = default!;
+    [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
+    [Dependency] private readonly IAudioInternal _audio = default!;
+    [Dependency] private readonly MetaDataSystem _metadata = default!;
+    [Dependency] private readonly SharedTransformSystem _xformSys = default!;
+    [Dependency] private readonly SharedPhysicsSystem _physics = default!;
+
+    /// <summary>
+    /// Per-tick cache of relevant streams.
+    /// </summary>
+    private readonly List<(EntityUid Entity, AudioComponent Component, TransformComponent Xform)> _streams = new();
+    private EntityUid? _listenerGrid;
+    private UpdateAudioJob _updateAudioJob;
+
+
+    private EntityQuery<PhysicsComponent> _physicsQuery;
+
+    private float _maxRayLength;
+
+    public override float ZOffset
+    {
+        get => _zOffset;
+        protected set
+        {
+            _zOffset = value;
+            _audio.SetZOffset(value);
+
+            var query = AllEntityQuery<AudioComponent>();
+
+            while (query.MoveNext(out var audio))
+            {
+                // Pythagoras back to normal then adjust.
+                var maxDistance = GetAudioDistance(audio.Params.MaxDistance);
+                var refDistance = GetAudioDistance(audio.Params.ReferenceDistance);
+
+                audio.MaxDistance = maxDistance;
+                audio.ReferenceDistance = refDistance;
+            }
+        }
+    }
+
+    private float _zOffset;
+
+    /// <inheritdoc />
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        _updateAudioJob = new UpdateAudioJob
+        {
+            System = this,
+            Streams = _streams,
+        };
+
+        UpdatesOutsidePrediction = true;
+        // Need to run after Eye updates so we have an accurate listener position.
+        UpdatesAfter.Add(typeof(EyeSystem));
+
+        _physicsQuery = GetEntityQuery<PhysicsComponent>();
+
+        SubscribeLocalEvent<AudioComponent, ComponentStartup>(OnAudioStartup);
+        SubscribeLocalEvent<AudioComponent, ComponentShutdown>(OnAudioShutdown);
+        SubscribeLocalEvent<AudioComponent, EntityPausedEvent>(OnAudioPaused);
+        SubscribeLocalEvent<AudioComponent, AfterAutoHandleStateEvent>(OnAudioState);
+
+        // Replay stuff
+        SubscribeNetworkEvent<PlayAudioGlobalMessage>(OnGlobalAudio);
+        SubscribeNetworkEvent<PlayAudioEntityMessage>(OnEntityAudio);
+        SubscribeNetworkEvent<PlayAudioPositionalMessage>(OnEntityCoordinates);
+
+        Subs.CVar(CfgManager, CVars.AudioAttenuation, OnAudioAttenuation, true);
+        Subs.CVar(CfgManager, CVars.AudioRaycastLength, OnRaycastLengthChanged, true);
+        InitializeLimit();
+    }
+
+    private void OnAudioState(EntityUid uid, AudioComponent component, ref AfterAutoHandleStateEvent args)
+    {
+        ApplyAudioParams(component.Params, component);
+        component.Source.Global = component.Global;
+
+        if (TryComp<AudioAuxiliaryComponent>(component.Auxiliary, out var auxComp))
+        {
+            component.Source.SetAuxiliary(auxComp.Auxiliary);
+        }
+        else
+        {
+            component.Source.SetAuxiliary(null);
+        }
+
+        switch (component.State)
+        {
+            case AudioState.Playing:
+                component.StartPlaying();
+                break;
+            case AudioState.Paused:
+                component.Pause();
+                break;
+            case AudioState.Stopped:
+                component.StopPlaying();
+                component.PlaybackPosition = 0f;
+                break;
+        }
+
+        // If playback position changed then update it.
+        if (!string.IsNullOrEmpty(component.FileName))
+        {
+            var position = (float) ((component.PauseTime ?? Timing.CurTime) - component.AudioStart).TotalSeconds;
+            var currentPosition = component.Source.PlaybackPosition;
+            var diff = Math.Abs(position - currentPosition);
+
+            if (diff > 0.1f)
+            {
+                component.PlaybackPosition = position;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Sets the volume for the entire game.
+    /// </summary>
+    public void SetMasterVolume(float value)
+    {
+        _audio.SetMasterGain(value);
+    }
+
+    private void OnAudioPaused(EntityUid uid, AudioComponent component, ref EntityPausedEvent args)
+    {
+        component.Pause();
+    }
+
+    protected override void OnAudioUnpaused(EntityUid uid, AudioComponent component, ref EntityUnpausedEvent args)
+    {
+        base.OnAudioUnpaused(uid, component, ref args);
+        component.StartPlaying();
+    }
+
+    private void OnAudioStartup(EntityUid uid, AudioComponent component, ComponentStartup args)
+    {
+        if (!Timing.ApplyingState && !Timing.IsFirstTimePredicted)
+        {
+            return;
+        }
+
+        // Source has already been set
+        if (component.Loaded)
+        {
+            return;
+        }
+
+        if (!TryGetAudio(component.FileName, out var audioResource))
+        {
+            Log.Error($"Error creating audio source for {audioResource}, can't find file {component.FileName}");
+            return;
+        }
+
+        SetupSource((uid, component), audioResource);
+        component.Loaded = true;
+    }
+
+    private void SetupSource(Entity<AudioComponent> entity, AudioResource audioResource, TimeSpan? length = null)
+    {
+        var component = entity.Comp;
+
+        if (TryAudioLimit(component.FileName))
+        {
+            var newSource = _audio.CreateAudioSource(audioResource);
+
+            if (newSource == null)
+            {
+                Log.Error($"Error creating audio source for {audioResource}");
+                DebugTools.Assert(false);
+            }
+            else
+            {
+                component.Source = newSource;
+            }
+        }
+
+        if ((component.Flags & AudioFlags.GridAudio) != 0x0)
+        {
+            _metadata.SetFlag(entity.Owner, MetaDataFlags.Undetachable, true);
+        }
+
+        // Need to set all initial data for first frame.
+        ApplyAudioParams(component.Params, component);
+        component.Source.Global = component.Global;
+
+        // Don't play until first frame so occlusion etc. are correct.
+        component.Gain = 0f;
+
+        length ??= GetAudioLength(component.FileName);
+
+        // If audio came into range then start playback at the correct position.
+        var offset = (Timing.CurTime - component.AudioStart).TotalSeconds % length.Value.TotalSeconds;
+
+        if (offset > 0)
+        {
+            component.PlaybackPosition = (float) offset;
+        }
+    }
+
+    private void OnAudioShutdown(EntityUid uid, AudioComponent component, ComponentShutdown args)
+    {
+        // Breaks with prediction?
+        component.Source.Dispose();
+
+        RemoveAudioLimit(component.FileName);
+    }
+
+    private void OnAudioAttenuation(int obj)
+    {
+        _audio.SetAttenuation((Attenuation) obj);
+    }
+
+    private void OnRaycastLengthChanged(float value)
+    {
+        _maxRayLength = value;
+    }
+
+    public override void FrameUpdate(float frameTime)
+    {
+        var eye = _eyeManager.CurrentEye;
+        var localEntity = _playerManager.LocalEntity;
+        Vector2 listenerVelocity;
+
+        if (localEntity != null)
+            listenerVelocity = _physics.GetMapLinearVelocity(localEntity.Value);
+        else
+            listenerVelocity = Vector2.Zero;
+
+        _audio.SetVelocity(listenerVelocity);
+        _audio.SetRotation(eye.Rotation);
+        _audio.SetPosition(eye.Position.Position);
+
+        var ourPos = GetListenerCoordinates();
+
+        var query = AllEntityQuery<AudioComponent, TransformComponent>();
+        _streams.Clear();
+
+        while (query.MoveNext(out var uid, out var comp, out var xform))
+        {
+            _streams.Add((uid, comp, xform));
+        }
+
+        _mapManager.TryFindGridAt(ourPos, out var gridUid, out _);
+        _listenerGrid = gridUid == EntityUid.Invalid ? null : gridUid;
+
+        try
+        {
+            _updateAudioJob.OurPosition = ourPos;
+            _parMan.ProcessNow(_updateAudioJob, _streams.Count);
+        }
+        catch (Exception e)
+        {
+            Log.Error($"Caught exception while processing entity streams.");
+            _runtimeLog.LogException(e, $"{nameof(AudioSystem)}.{nameof(FrameUpdate)}");
+        }
+    }
+
+    public MapCoordinates GetListenerCoordinates()
+    {
+        return _eyeManager.CurrentEye.Position;
+    }
+
+    private void ProcessStream(EntityUid entity, AudioComponent component, TransformComponent xform, MapCoordinates listener)
+    {
+        // TODO:
+        // I Originally tried to be fancier here but it caused audio issues so just trying
+        // to replicate the old behaviour for now.
+        if (!component.Started)
+        {
+            component.Started = true;
+            component.StartPlaying();
+        }
+
+        // If it's global but on another map (that isn't nullspace) then stop playing it.
+        if (component.Global)
+        {
+            if (xform.MapID != MapId.Nullspace && listener.MapId != xform.MapID)
+            {
+                component.Gain = 0f;
+                return;
+            }
+
+            // Resume playing.
+            component.Volume = component.Params.Volume;
+            return;
+        }
+
+        // Non-global sounds, stop playing if on another map.
+        // Not relevant to us.
+        if (listener.MapId != xform.MapID)
+        {
+            component.Gain = 0f;
+            return;
+        }
+
+        Vector2 worldPos;
+        var gridUid = xform.ParentUid;
+
+        // Handle grid audio differently by using nearest-edge instead of entity centre.
+        if ((component.Flags & AudioFlags.GridAudio) != 0x0)
+        {
+            // It's our grid so max volume.
+            if (_listenerGrid == gridUid)
+            {
+                component.Volume = component.Params.Volume;
+                component.Occlusion = 0f;
+                component.Position = listener.Position;
+                return;
+            }
+
+            // TODO: Need a grid-optimised version because this is gonna be expensive.
+            // Just to avoid clipping on and off grid or nearestPoint changing we'll
+            // always set the sound to listener's pos, we'll just manually do gain ourselves.
+            if (_physics.TryGetNearest(gridUid, listener, out _, out var gridDistance))
+            {
+                // Out of range
+                if (gridDistance > component.MaxDistance)
+                {
+                    component.Gain = 0f;
+                    return;
+                }
+
+                var paramsGain = VolumeToGain(component.Params.Volume);
+
+                // Thought I'd never have to manually calculate gain again but this is the least
+                // unpleasant audio I could get at the moment.
+                component.Gain = paramsGain * _audio.GetAttenuationGain(
+                    gridDistance,
+                    component.Params.RolloffFactor,
+                    component.Params.ReferenceDistance,
+                    component.Params.MaxDistance);
+                component.Position = listener.Position;
+                return;
+            }
+
+            // Can't get nearest point so don't play anymore.
+            component.Gain = 0f;
+            return;
+        }
+
+        worldPos = _xformSys.GetWorldPosition(entity);
+        component.Volume = component.Params.Volume;
+
+        // Max distance check
+        var delta = worldPos - listener.Position;
+        var distance = delta.Length();
+
+        // Out of range so just clip it for us.
+        if (GetAudioDistance(distance) > component.MaxDistance)
+        {
+            // Still keeps the source playing, just with no volume.
+            component.Gain = 0f;
+            return;
+        }
+
+        if (distance > 0f && distance < 0.01f)
+        {
+            worldPos = listener.Position;
+            delta = Vector2.Zero;
+            distance = 0f;
+        }
+
+        // Update audio occlusion
+        var occlusion = GetOcclusion(listener, delta, distance, entity);
+        component.Occlusion = occlusion;
+
+        // Update audio positions.
+        component.Position = worldPos;
+
+        // Make race cars go NYYEEOOOOOMMMMM
+        if (_physicsQuery.TryGetComponent(entity, out var physicsComp))
+        {
+            // This actually gets the tracked entity's xform & iterates up though the parents for the second time. Bit
+            // inefficient.
+            var velocity = _physics.GetMapLinearVelocity(entity, physicsComp, xform);
+            component.Velocity = velocity;
+        }
+    }
+
+    /// <summary>
+    /// Gets the audio occlusion from the target audio entity to the listener's position.
+    /// </summary>
+    public float GetOcclusion(MapCoordinates listener, Vector2 delta, float distance, EntityUid? ignoredEnt = null)
+    {
+        float occlusion = 0;
+
+        if (distance > 0.1)
+        {
+            var rayLength = MathF.Min(distance, _maxRayLength);
+            var ray = new CollisionRay(listener.Position, delta / distance, OcclusionCollisionMask);
+            occlusion = _physics.IntersectRayPenetration(listener.MapId, ray, rayLength, ignoredEnt);
+        }
+
+        return occlusion;
+    }
+
+    private bool TryGetAudio(string filename, [NotNullWhen(true)] out AudioResource? audio)
+    {
+        if (_resourceCache.TryGetResource(new ResPath(filename), out audio))
+            return true;
+
+        Log.Error($"Server tried to play audio file {filename} which does not exist.");
+        return false;
+    }
+
+    private bool TryGetAudio(AudioStream stream, [NotNullWhen(true)] out AudioResource? audio)
+    {
+        if (_resourceCache.TryGetResource(stream, out audio))
+            return true;
+
+        Log.Error($"Server failed to play audio stream {stream.Title}.");
+        return false;
+    }
+
+    public override (EntityUid Entity, AudioComponent Component)? PlayPvs(string? filename, EntityCoordinates coordinates,
+        AudioParams? audioParams = null)
+    {
+        return PlayStatic(filename, Filter.Local(), coordinates, true, audioParams);
+    }
+
+    public override (EntityUid Entity, AudioComponent Component)? PlayPvs(string? filename, EntityUid uid, AudioParams? audioParams = null)
+    {
+        return PlayEntity(filename, Filter.Local(), uid, true, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayPredicted(SoundSpecifier? sound, EntityUid source, EntityUid? user, AudioParams? audioParams = null)
+    {
+        if (Timing.IsFirstTimePredicted && sound != null)
+            return PlayEntity(sound, Filter.Local(), source, false, audioParams);
+
+        return null; // uhh Lets hope predicted audio never needs to somehow store the playing audio....
+    }
+
+    public override (EntityUid Entity, AudioComponent Component)? PlayPredicted(SoundSpecifier? sound, EntityCoordinates coordinates, EntityUid? user, AudioParams? audioParams = null)
+    {
+        if (Timing.IsFirstTimePredicted && sound != null)
+            return PlayStatic(sound, Filter.Local(), coordinates, false, audioParams);
+
+        return null;
+    }
+
+    /// <summary>
+    ///     Play an audio file globally, without position.
+    /// </summary>
+    /// <param name="filename">The resource path to the OGG Vorbis file to play.</param>
+    /// <param name="audioParams"></param>
+    private (EntityUid Entity, AudioComponent Component)? PlayGlobal(string? filename, AudioParams? audioParams = null, bool recordReplay = true)
+    {
+        if (string.IsNullOrEmpty(filename))
+            return null;
+
+        if (recordReplay && _replayRecording.IsRecording)
+        {
+            _replayRecording.RecordReplayMessage(new PlayAudioGlobalMessage
+            {
+                FileName = filename,
+                AudioParams = audioParams ?? AudioParams.Default
+            });
+        }
+
+        return TryGetAudio(filename, out var audio) ? PlayGlobal(audio, audioParams) : default;
+    }
+
+    /// <summary>
+    ///     Play an audio stream globally, without position.
+    /// </summary>
+    /// <param name="stream">The audio stream to play.</param>
+    /// <param name="audioParams"></param>
+    public (EntityUid Entity, AudioComponent Component)? PlayGlobal(AudioStream stream, AudioParams? audioParams = null)
+    {
+        var (entity, component) = CreateAndStartPlayingStream(audioParams, stream);
+        component.Global = true;
+        component.Source.Global = true;
+        Dirty(entity, component);
+        return (entity, component);
+    }
+
+    /// <summary>
+    ///     Play an audio file following an entity.
+    /// </summary>
+    /// <param name="filename">The resource path to the OGG Vorbis file to play.</param>
+    /// <param name="entity">The entity "emitting" the audio.</param>
+    private (EntityUid Entity, AudioComponent Component)? PlayEntity(string? filename, EntityUid entity, AudioParams? audioParams = null, bool recordReplay = true)
+    {
+        if (string.IsNullOrEmpty(filename))
+            return null;
+
+        if (recordReplay && _replayRecording.IsRecording)
+        {
+            _replayRecording.RecordReplayMessage(new PlayAudioEntityMessage
+            {
+                FileName = filename,
+                NetEntity = GetNetEntity(entity),
+                AudioParams = audioParams ?? AudioParams.Default
+            });
+        }
+
+        return TryGetAudio(filename, out var audio) ? PlayEntity(audio, entity, audioParams) : default;
+    }
+
+    /// <summary>
+    ///     Play an audio stream following an entity.
+    /// </summary>
+    /// <param name="stream">The audio stream to play.</param>
+    /// <param name="entity">The entity "emitting" the audio.</param>
+    /// <param name="audioParams"></param>
+    public (EntityUid Entity, AudioComponent Component)? PlayEntity(AudioStream stream, EntityUid entity, AudioParams? audioParams = null)
+    {
+        if (TerminatingOrDeleted(entity))
+        {
+            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(entity)}");
+            return null;
+        }
+
+        var playing = CreateAndStartPlayingStream(audioParams, stream);
+        _xformSys.SetCoordinates(playing.Entity, new EntityCoordinates(entity, Vector2.Zero));
+
+        return playing;
+    }
+
+    /// <summary>
+    ///     Play an audio file at a static position.
+    /// </summary>
+    /// <param name="filename">The resource path to the OGG Vorbis file to play.</param>
+    /// <param name="coordinates">The coordinates at which to play the audio.</param>
+    /// <param name="audioParams"></param>
+    private (EntityUid Entity, AudioComponent Component)? PlayStatic(string? filename, EntityCoordinates coordinates, AudioParams? audioParams = null, bool recordReplay = true)
+    {
+        if (string.IsNullOrEmpty(filename))
+            return null;
+
+        if (recordReplay && _replayRecording.IsRecording)
+        {
+            _replayRecording.RecordReplayMessage(new PlayAudioPositionalMessage
+            {
+                FileName = filename,
+                Coordinates = GetNetCoordinates(coordinates),
+                AudioParams = audioParams ?? AudioParams.Default
+            });
+        }
+
+        return TryGetAudio(filename, out var audio) ? PlayStatic(audio, coordinates, audioParams) : default;
+    }
+
+    /// <summary>
+    ///     Play an audio stream at a static position.
+    /// </summary>
+    /// <param name="stream">The audio stream to play.</param>
+    /// <param name="coordinates">The coordinates at which to play the audio.</param>
+    /// <param name="audioParams"></param>
+    public (EntityUid Entity, AudioComponent Component)? PlayStatic(AudioStream stream, EntityCoordinates coordinates, AudioParams? audioParams = null)
+    {
+        if (TerminatingOrDeleted(coordinates.EntityId))
+        {
+            Log.Error($"Tried to play coordinates audio on a terminating / deleted entity {ToPrettyString(coordinates.EntityId)}");
+            return null;
+        }
+
+        var playing = CreateAndStartPlayingStream(audioParams, stream);
+        _xformSys.SetCoordinates(playing.Entity, coordinates);
+        return playing;
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayGlobal(string? filename, Filter playerFilter, bool recordReplay, AudioParams? audioParams = null)
+    {
+        return PlayGlobal(filename, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayEntity(string? filename, Filter playerFilter, EntityUid entity, bool recordReplay, AudioParams? audioParams = null)
+    {
+        return PlayEntity(filename, entity, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayStatic(string? filename, Filter playerFilter, EntityCoordinates coordinates, bool recordReplay, AudioParams? audioParams = null)
+    {
+        return PlayStatic(filename, coordinates, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayGlobal(string? filename, ICommonSession recipient, AudioParams? audioParams = null)
+    {
+        return PlayGlobal(filename, audioParams);
+    }
+
+    public override void LoadStream<T>(Entity<AudioComponent> entity, T stream)
+    {
+        if (stream is AudioStream audioStream)
+        {
+            TryGetAudio(audioStream, out var audio);
+            SetupSource(entity, audio!, audioStream.Length);
+            entity.Comp.Loaded = true;
+        }
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayGlobal(string? filename, EntityUid recipient, AudioParams? audioParams = null)
+    {
+        return PlayGlobal(filename, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayEntity(string? filename, ICommonSession recipient, EntityUid uid, AudioParams? audioParams = null)
+    {
+        return PlayEntity(filename, uid, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayEntity(string? filename, EntityUid recipient, EntityUid uid, AudioParams? audioParams = null)
+    {
+        return PlayEntity(filename, uid, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayStatic(string? filename, ICommonSession recipient, EntityCoordinates coordinates, AudioParams? audioParams = null)
+    {
+        return PlayStatic(filename, coordinates, audioParams);
+    }
+
+    /// <inheritdoc />
+    public override (EntityUid Entity, AudioComponent Component)? PlayStatic(string? filename, EntityUid recipient, EntityCoordinates coordinates, AudioParams? audioParams = null)
+    {
+        return PlayStatic(filename, coordinates, audioParams);
+    }
+
+    private (EntityUid Entity, AudioComponent Component) CreateAndStartPlayingStream(AudioParams? audioParams, AudioStream stream)
+    {
+        var audioP = audioParams ?? AudioParams.Default;
+        var entity = EntityManager.CreateEntityUninitialized("Audio", MapCoordinates.Nullspace);
+        var comp = SetupAudio(entity, null, audioP, stream.Length);
+        LoadStream((entity, comp), stream);
+        EntityManager.InitializeAndStartEntity(entity);
+        var source = comp.Source;
+
+        // TODO clamp the offset inside of SetPlaybackPosition() itself.
+        var offset = audioP.PlayOffsetSeconds;
+        offset = Math.Clamp(offset, 0f, (float) stream.Length.TotalSeconds - 0.01f);
+        source.PlaybackPosition = offset;
+
+        // For server we will rely on the adjusted one but locally we will have to adjust it ourselves.
+        ApplyAudioParams(comp.Params, comp);
+        source.StartPlaying();
+        return (entity, comp);
+    }
+
+    /// <summary>
+    /// Applies the audioparams to the underlying audio source.
+    /// </summary>
+    private void ApplyAudioParams(AudioParams audioParams, IAudioSource source)
+    {
+        source.Pitch = audioParams.Pitch;
+        source.Volume = audioParams.Volume;
+        source.RolloffFactor = audioParams.RolloffFactor;
+        source.MaxDistance = GetAudioDistance(audioParams.MaxDistance);
+        source.ReferenceDistance = GetAudioDistance(audioParams.ReferenceDistance);
+        source.Looping = audioParams.Loop;
+    }
+
+    private void OnEntityCoordinates(PlayAudioPositionalMessage ev)
+    {
+        PlayStatic(ev.FileName, GetCoordinates(ev.Coordinates), ev.AudioParams, false);
+    }
+
+    private void OnEntityAudio(PlayAudioEntityMessage ev)
+    {
+        PlayEntity(ev.FileName, GetEntity(ev.NetEntity), ev.AudioParams, false);
+    }
+
+    private void OnGlobalAudio(PlayAudioGlobalMessage ev)
+    {
+        PlayGlobal(ev.FileName, ev.AudioParams, false);
+    }
+
+    protected override TimeSpan GetAudioLengthImpl(string filename)
+    {
+        return _resourceCache.GetResource<AudioResource>(filename).AudioStream.Length;
+    }
+
+    #region Jobs
+
+    private record struct UpdateAudioJob : IParallelRobustJob
+    {
+        public int BatchSize => 2;
+
+        public AudioSystem System;
+
+        public MapCoordinates OurPosition;
+        public List<(EntityUid Entity, AudioComponent Component, TransformComponent Xform)> Streams;
+
+        public void Execute(int index)
+        {
+            var comp = Streams[index];
+
+            System.ProcessStream(comp.Entity, comp.Component, comp.Xform, OurPosition);
+        }
+    }
+
+    #endregion
+}

Robust.Client/Audio/Effects/AudioEffect.cs

@@ -0,0 +1,455 @@
+using System;
+using OpenTK.Audio.OpenAL.Extensions.Creative.EFX;
+using Robust.Shared.Audio;
+using Robust.Shared.Audio.Effects;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.Audio.Effects;
+
+/// <inheritdoc />
+internal sealed class AudioEffect : IAudioEffect
+{
+    internal int Handle;
+
+    private readonly IAudioInternal _master;
+
+    public AudioEffect(IAudioInternal manager)
+    {
+        Handle = EFX.GenEffect();
+        _master = manager;
+        EFX.Effect(Handle, EffectInteger.EffectType, (int) EffectType.EaxReverb);
+    }
+
+    public void Dispose()
+    {
+        if (Handle != 0)
+        {
+            EFX.DeleteEffect(Handle);
+            Handle = 0;
+        }
+    }
+
+    private void _checkDisposed()
+    {
+        if (Handle == -1)
+        {
+            throw new ObjectDisposedException(nameof(AudioEffect));
+        }
+    }
+
+    /// <inheritdoc />
+    public float Density
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbDensity, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbDensity, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float Diffusion
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbDiffusion, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbDiffusion, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float Gain
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbGain, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbGain, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float GainHF
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbGainHF, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbGainHF, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float GainLF
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbGainLF, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbGainLF, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float DecayTime
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbDecayTime, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbDecayTime, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float DecayHFRatio
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbDecayHFRatio, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbDecayHFRatio, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float DecayLFRatio
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbDecayLFRatio, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbDecayLFRatio, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float ReflectionsGain
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbReflectionsGain, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbReflectionsGain, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float ReflectionsDelay
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbReflectionsDelay, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbReflectionsDelay, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public Vector3 ReflectionsPan
+    {
+        get
+        {
+            _checkDisposed();
+            var value = EFX.GetEffect(Handle, EffectVector3.EaxReverbReflectionsPan);
+            _master._checkAlError();
+            return new Vector3(value.X, value.Z, value.Y);
+        }
+        set
+        {
+            _checkDisposed();
+            var openVec = new OpenTK.Mathematics.Vector3(value.X, value.Y, value.Z);
+            EFX.Effect(Handle, EffectVector3.EaxReverbReflectionsPan, ref openVec);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float LateReverbGain
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbLateReverbGain, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbLateReverbGain, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float LateReverbDelay
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbLateReverbDelay, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbLateReverbDelay, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public Vector3 LateReverbPan
+    {
+        get
+        {
+            _checkDisposed();
+            var value = EFX.GetEffect(Handle, EffectVector3.EaxReverbLateReverbPan);
+            _master._checkAlError();
+            return new Vector3(value.X, value.Z, value.Y);
+        }
+        set
+        {
+            _checkDisposed();
+            var openVec = new OpenTK.Mathematics.Vector3(value.X, value.Y, value.Z);
+            EFX.Effect(Handle, EffectVector3.EaxReverbLateReverbPan, ref openVec);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float EchoTime
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbEchoTime, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbEchoTime, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float EchoDepth
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbEchoDepth, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbEchoDepth, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float ModulationTime
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbModulationTime, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbModulationTime, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float ModulationDepth
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbModulationDepth, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbModulationDepth, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float AirAbsorptionGainHF
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbAirAbsorptionGainHF, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbAirAbsorptionGainHF, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float HFReference
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbHFReference, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbHFReference, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float LFReference
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbLFReference, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbLFReference, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public float RoomRolloffFactor
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectFloat.EaxReverbRoomRolloffFactor, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectFloat.EaxReverbRoomRolloffFactor, value);
+            _master._checkAlError();
+        }
+    }
+
+    /// <inheritdoc />
+    public int DecayHFLimit
+    {
+        get
+        {
+            _checkDisposed();
+            EFX.GetEffect(Handle, EffectInteger.EaxReverbDecayHFLimit, out var value);
+            _master._checkAlError();
+            return value;
+        }
+        set
+        {
+            _checkDisposed();
+            EFX.Effect(Handle, EffectInteger.EaxReverbDecayHFLimit, value);
+            _master._checkAlError();
+        }
+    }
+}

Robust.Client/Audio/Effects/AuxiliaryAudio.cs

@@ -0,0 +1,32 @@
+using OpenTK.Audio.OpenAL.Extensions.Creative.EFX;
+using Robust.Shared.Audio.Effects;
+
+namespace Robust.Client.Audio.Effects;
+
+/// <inheritdoc />
+internal sealed class AuxiliaryAudio : IAuxiliaryAudio
+{
+    internal int Handle = EFX.GenAuxiliaryEffectSlot();
+
+    public void Dispose()
+    {
+        if (Handle != -1)
+        {
+            EFX.DeleteAuxiliaryEffectSlot(Handle);
+            Handle = -1;
+        }
+    }
+
+    /// <inheritdoc />
+    public void SetEffect(IAudioEffect? effect)
+    {
+        if (effect is AudioEffect audEffect)
+        {
+            EFX.AuxiliaryEffectSlot(Handle, EffectSlotInteger.Effect, audEffect.Handle);
+        }
+        else
+        {
+            EFX.AuxiliaryEffectSlot(Handle, EffectSlotInteger.Effect, 0);
+        }
+    }
+}

Robust.Client/Audio/HeadlessAudioManager.cs

@@ -0,0 +1,111 @@
+using System;
+using System.IO;
+using System.Numerics;
+using Robust.Shared.Audio;
+using Robust.Shared.Audio.AudioLoading;
+using Robust.Shared.Audio.Sources;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.Audio;
+
+/// <summary>
+/// Headless client audio.
+/// </summary>
+internal sealed class HeadlessAudioManager : IAudioInternal
+{
+    /// <inheritdoc />
+    public void InitializePostWindowing()
+    {
+    }
+
+    /// <inheritdoc />
+    public void Shutdown()
+    {
+    }
+
+    /// <inheritdoc />
+    public void FlushALDisposeQueues()
+    {
+    }
+
+    /// <inheritdoc />
+    public IAudioSource CreateAudioSource(AudioStream stream)
+    {
+        return DummyAudioSource.Instance;
+    }
+
+    /// <inheritdoc />
+    public IBufferedAudioSource? CreateBufferedAudioSource(int buffers, bool floatAudio = false)
+    {
+        return DummyBufferedAudioSource.Instance;
+    }
+
+    /// <inheritdoc />
+    public void SetVelocity(Vector2 velocity)
+    {
+    }
+
+    /// <inheritdoc />
+    public void SetPosition(Vector2 position)
+    {
+    }
+
+    /// <inheritdoc />
+    public void SetRotation(Angle angle)
+    {
+    }
+
+    /// <inheritdoc />
+    public void SetMasterGain(float newGain)
+    {
+    }
+
+    /// <inheritdoc />
+    public void SetAttenuation(Attenuation attenuation)
+    {
+    }
+
+    /// <inheritdoc />
+    public void StopAllAudio()
+    {
+    }
+
+    /// <inheritdoc />
+    public void SetZOffset(float f)
+    {
+    }
+
+    /// <inheritdoc />
+    public void _checkAlError(string callerMember = "", int callerLineNumber = -1)
+    {
+    }
+
+    /// <inheritdoc />
+    public float GetAttenuationGain(float distance, float rolloffFactor, float referenceDistance, float maxDistance)
+    {
+        return 0f;
+    }
+
+    public AudioStream LoadAudioOggVorbis(Stream stream, string? name = null)
+    {
+        var metadata = AudioLoaderOgg.LoadAudioMetadata(stream);
+        return AudioStreamFromMetadata(metadata, name);
+    }
+
+    public AudioStream LoadAudioWav(Stream stream, string? name = null)
+    {
+        var metadata = AudioLoaderWav.LoadAudioMetadata(stream);
+        return AudioStreamFromMetadata(metadata, name);
+    }
+
+    public AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null)
+    {
+        var length = TimeSpan.FromSeconds((double) samples.Length / channels / sampleRate);
+        return new AudioStream(null, length, channels, name);
+    }
+
+    private static AudioStream AudioStreamFromMetadata(AudioMetadata metadata, string? name)
+    {
+        return new AudioStream(null, metadata.Length, metadata.ChannelCount, name, metadata.Title, metadata.Artist);
+    }
+}

Robust.Client/Audio/IAudioInternal.cs

@@ -0,0 +1,63 @@
+using System;
+using System.IO;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using Robust.Shared.Audio;
+using Robust.Shared.Audio.Sources;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.Audio;
+
+/// <summary>
+/// Handles clientside audio.
+/// </summary>
+internal interface IAudioInternal : IAudioManager
+{
+    void InitializePostWindowing();
+    void Shutdown();
+
+    /// <summary>
+    /// Flushes all pending queues for disposing of AL sources.
+    /// </summary>
+    void FlushALDisposeQueues();
+
+    /// <summary>
+    /// Returns a buffered audio source.
+    /// </summary>
+    /// <returns>null if unable to create the source.</returns>
+    IBufferedAudioSource? CreateBufferedAudioSource(int buffers, bool floatAudio=false);
+
+    /// <summary>
+    /// Sets the velocity for the audio listener.
+    /// </summary>
+    void SetVelocity(Vector2 velocity);
+
+    /// <summary>
+    /// Sets position for the audio listener.
+    /// </summary>
+    void SetPosition(Vector2 position);
+
+    /// <summary>
+    /// Sets rotation for the audio listener.
+    /// </summary>
+    void SetRotation(Angle angle);
+
+    void SetAttenuation(Attenuation attenuation);
+
+    /// <summary>
+    /// Stops all audio from playing.
+    /// </summary>
+    void StopAllAudio();
+
+    /// <summary>
+    /// Sets the Z-offset for the audio listener.
+    /// </summary>
+    void SetZOffset(float f);
+
+    void _checkAlError([CallerMemberName] string callerMember = "", [CallerLineNumber] int callerLineNumber = -1);
+
+    /// <summary>
+    /// Manually calculates the specified gain for an attenuation source with the specified distance.
+    /// </summary>
+    float GetAttenuationGain(float distance, float rolloffFactor, float referenceDistance, float maxDistance);
+}

Robust.Client/Audio/IAudioManager.cs

@@ -0,0 +1,22 @@
+using System;
+using System.IO;
+using Robust.Client.Audio.Sources;
+using Robust.Shared.Audio.Sources;
+
+namespace Robust.Client.Audio;
+
+/// <summary>
+/// Public audio API for stuff that can't go through <see cref="AudioSystem"/>
+/// </summary>
+public interface IAudioManager
+{
+    IAudioSource? CreateAudioSource(AudioStream stream);
+  
+    AudioStream LoadAudioOggVorbis(Stream stream, string? name = null);
+
+    AudioStream LoadAudioWav(Stream stream, string? name = null);
+
+    AudioStream LoadAudioRaw(ReadOnlySpan<short> samples, int channels, int sampleRate, string? name = null);
+
+    void SetMasterGain(float gain);
+}

Robust.Client/Audio/Midi/IMidiManager.cs

@@ -17,11 +17,9 @@ public interface IMidiManager
     bool IsAvailable { get; }
 
     /// <summary>
-    ///     Volume, in db.
+    ///     Gain of audio.
     /// </summary>
-    float Volume { get; set; }
-
-    public int OcclusionCollisionMask { get; set; }
+    float Gain { get; set; }
 
     /// <summary>
     ///     This method tries to return a midi renderer ready to be used.

Robust.Client/Audio/Midi/IMidiRenderer.cs

@@ -1,6 +1,9 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
 using Robust.Client.Graphics;
 using Robust.Shared.Audio.Midi;
+using Robust.Shared.Audio.Sources;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Map;
 
@@ -15,11 +18,10 @@ public enum MidiRendererStatus : byte
 
 public interface IMidiRenderer : IDisposable
 {
-
     /// <summary>
     ///     The buffered audio source of this renderer.
     /// </summary>
-    internal IClydeBufferedAudioSource Source { get; }
+    internal IBufferedAudioSource Source { get; }
 
     /// <summary>
     ///     Whether this renderer has been disposed or not.
@@ -34,6 +36,7 @@ public interface IMidiRenderer : IDisposable
     /// <summary>
     ///     This increases all note on velocities to 127.
     /// </summary>
+    [Obsolete($"Use {nameof(VelocityOverride)} instead, you can set it to 127 to achieve the same effect.")]
     bool VolumeBoost { get; set; }
 
     /// <summary>
@@ -94,6 +97,27 @@ public interface IMidiRenderer : IDisposable
     /// </summary>
     double SequencerTimeScale { get; }
 
+    /// <summary>
+    ///     Whether this renderer will subscribe to another and copy its events.
+    ///     See <see cref="FilteredChannels"/> to filter specific channels.
+    /// </summary>
+    IMidiRenderer? Master { get; set; }
+
+    // NOTE: Why is the properties below BitArray, you ask?
+    // Well see, MIDI 2.0 supports up to 256(!) channels as opposed to MIDI 1.0's meekly 16 channels...
+    // I'd like us to support MIDI 2.0 one day so I'm just future-proofing here. Also BitArray is cool!
+
+    /// <summary>
+    ///     Allows you to filter out note events from certain channels.
+    ///     Only NoteOn will be filtered.
+    /// </summary>
+    BitArray FilteredChannels { get; }
+
+    /// <summary>
+    ///     Allows you to override all NoteOn velocities. Set to null to disable.
+    /// </summary>
+    byte? VelocityOverride { get; set; }
+
     /// <summary>
     ///     Start listening for midi input.
     /// </summary>
@@ -120,6 +144,11 @@ public interface IMidiRenderer : IDisposable
     /// </summary>
     void StopAllNotes();
 
+    /// <summary>
+    ///     Reset renderer back to a clean state.
+    /// </summary>
+    void SystemReset();
+
     /// <summary>
     /// Clears all scheduled events.
     /// </summary>
@@ -156,7 +185,7 @@ public interface IMidiRenderer : IDisposable
     ///     This is only used if <see cref="Mono"/> is set to True
     ///     and <see cref="TrackingEntity"/> is null.
     /// </summary>
-    EntityCoordinates? TrackingCoordinates { get; set; }
+    MapCoordinates? TrackingCoordinates { get; set; }
 
     MidiRendererState RendererState { get; }
 
@@ -164,7 +193,8 @@ public interface IMidiRenderer : IDisposable
     ///     Send a midi event for the renderer to play.
     /// </summary>
     /// <param name="midiEvent">The midi event to be played</param>
-    void SendMidiEvent(RobustMidiEvent midiEvent);
+    /// <param name="raiseEvent">Whether to raise an event for this event.</param>
+    void SendMidiEvent(RobustMidiEvent midiEvent, bool raiseEvent = true);
 
     /// <summary>
     ///     Schedule a MIDI event to be played at a later time.
@@ -177,7 +207,7 @@ public interface IMidiRenderer : IDisposable
     /// <summary>
     ///     Apply a certain state to the renderer.
     /// </summary>
-    void ApplyState(MidiRendererState state);
+    void ApplyState(MidiRendererState state, bool filterChannels = false);
 
     /// <summary>
     ///     Actually disposes of this renderer. Do NOT use outside the MIDI thread.

Robust.Client/Audio/Midi/MidiManager.cs

@@ -1,22 +1,27 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Numerics;
 using System.Runtime.InteropServices;
 using System.Threading;
+using System.Threading.Tasks;
 using NFluidsynth;
-using Robust.Client.Graphics;
-using Robust.Client.ResourceManagement;
 using Robust.Shared;
 using Robust.Shared.Asynchronous;
+using Robust.Shared.Audio.Midi;
+using Robust.Shared.Collections;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
+using Robust.Shared.Exceptions;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
-using Robust.Shared.Physics;
+using Robust.Shared.Physics.Components;
 using Robust.Shared.Physics.Systems;
+using Robust.Shared.Threading;
+using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 
@@ -26,15 +31,19 @@ internal sealed partial class MidiManager : IMidiManager
 {
     public const string SoundfontEnvironmentVariable = "ROBUST_SOUNDFONT_OVERRIDE";
 
-    [Dependency] private readonly IEyeManager _eyeManager = default!;
-    [Dependency] private readonly IResourceCacheInternal _resourceManager = default!;
+    [Dependency] private readonly IGameTiming _timing = default!;
+    [Dependency] private readonly IResourceManager _resourceManager = default!;
     [Dependency] private readonly IEntityManager _entityManager = default!;
     [Dependency] private readonly IConfigurationManager _cfgMan = default!;
-    [Dependency] private readonly IClydeAudio _clydeAudio = default!;
+    [Dependency] private readonly IAudioInternal _audio = default!;
     [Dependency] private readonly ITaskManager _taskManager = default!;
     [Dependency] private readonly ILogManager _logger = default!;
+    [Dependency] private readonly IParallelManager _parallel = default!;
+    [Dependency] private readonly IRuntimeLog _runtime = default!;
 
+    private AudioSystem _audioSys = default!;
     private SharedPhysicsSystem _broadPhaseSystem = default!;
+    private SharedTransformSystem _xformSystem = default!;
 
     public IReadOnlyList<IMidiRenderer> Renderers
     {
@@ -59,27 +68,34 @@ internal sealed partial class MidiManager : IMidiManager
         }
     }
 
-    [ViewVariables]
-    private readonly List<IMidiRenderer> _renderers = new();
+    [ViewVariables] private readonly List<IMidiRenderer> _renderers = new();
+
+    // To avoid lock contention until some kind of MIDI refactor.
+    private TimeSpan _nextUpdate;
+    private TimeSpan _updateFrequency = TimeSpan.FromSeconds(0.25f);
+
+    private SemaphoreSlim _updateSemaphore = new(1);
 
     private bool _alive = true;
-    private Settings? _settings;
+    [ViewVariables] private Settings? _settings;
     private Thread? _midiThread;
     private ISawmill _midiSawmill = default!;
-    private float _volume = 0f;
+    private float _gain = 0f;
     private bool _volumeDirty = true;
 
     // Not reliable until Fluidsynth is initialized!
     [ViewVariables(VVAccess.ReadWrite)]
-    public float Volume
+    public float Gain
     {
-        get => _volume;
+        get => _gain;
         set
         {
-            if (MathHelper.CloseToPercent(_volume, value))
+            var clamped = Math.Clamp(value, 0f, 1f);
+
+            if (MathHelper.CloseToPercent(_gain, clamped))
                 return;
 
-            _cfgMan.SetCVar(CVars.MidiVolume, value);
+            _cfgMan.SetCVar(CVars.MidiVolume, clamped);
             _volumeDirty = true;
         }
     }
@@ -98,7 +114,7 @@ internal sealed partial class MidiManager : IMidiManager
         "/usr/share/sounds/sf2/TimGM6mb.sf2",
     };
 
-    private const string WindowsSoundfont = @"C:\WINDOWS\system32\drivers\gm.dls";
+    private static readonly string WindowsSoundfont = $@"{Environment.GetEnvironmentVariable("SystemRoot")}\system32\drivers\gm.dls";
 
     private const string OsxSoundfont =
         "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
@@ -115,11 +131,10 @@ internal sealed partial class MidiManager : IMidiManager
     private bool _failedInitialize;
 
     private NFluidsynth.Logger.LoggerDelegate _loggerDelegate = default!;
-    private ISawmill _sawmill = default!;
-    private float _maxCastLength;
+    private ISawmill _fluidsynthSawmill = default!;
+
+    private MidiUpdateJob _updateJob;
 
-    [ViewVariables(VVAccess.ReadWrite)]
-    public int OcclusionCollisionMask { get; set; }
 
     public MidiManager()
     {
@@ -130,10 +145,9 @@ internal sealed partial class MidiManager : IMidiManager
     {
         if (FluidsynthInitialized || _failedInitialize) return;
 
-        _volume = _cfgMan.GetCVar(CVars.MidiVolume);
         _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
         {
-            _volume = value;
+            _gain = value;
             _volumeDirty = true;
         }, true);
 
@@ -143,7 +157,7 @@ internal sealed partial class MidiManager : IMidiManager
 #else
         _midiSawmill.Level = LogLevel.Error;
 #endif
-        _sawmill = _logger.GetSawmill("midi.fluidsynth");
+        _fluidsynthSawmill = _logger.GetSawmill("midi.fluidsynth");
         _loggerDelegate = LoggerDelegate;
 
         if (!_resourceManager.UserData.Exists(CustomSoundfontDirectory))
@@ -167,8 +181,6 @@ internal sealed partial class MidiManager : IMidiManager
             _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";
@@ -176,8 +188,16 @@ internal sealed partial class MidiManager : IMidiManager
             _settings["audio.period-size"].IntValue = 4096;
             _settings["midi.autoconnect"].IntValue = 1;
             _settings["player.reset-synth"].IntValue = 0;
+            _settings["synth.midi-channels"].IntValue = Math.Clamp(RobustMidiEvent.MaxChannels, 16, 256);
             _settings["synth.midi-bank-select"].StringValue = "gm";
             //_settings["synth.verbose"].IntValue = 1; // Useful for debugging.
+
+            var midiParallel = _cfgMan.GetCVar(CVars.MidiParallelism);
+            _settings["synth.polyphony"].IntValue = Math.Clamp(1024 + (int)(Math.Log2(midiParallel) * 2048), 1, 65535);
+            _settings["synth.cpu-cores"].IntValue = Math.Clamp(midiParallel, 1, 256);
+
+            _midiSawmill.Debug($"Synth Cores: {_settings["synth.cpu-cores"].IntValue}");
+            _midiSawmill.Debug($"Synth Polyphony: {_settings["synth.polyphony"].IntValue}");
         }
         catch (Exception e)
         {
@@ -186,20 +206,27 @@ internal sealed partial class MidiManager : IMidiManager
             return;
         }
 
-        _midiThread = new Thread(ThreadUpdate);
+        _midiThread = new Thread(ThreadUpdate)
+        {
+            Name = "RobustToolbox MIDI Thread"
+        };
         _midiThread.Start();
 
+        _updateJob = new MidiUpdateJob()
+        {
+            Manager = this,
+            Renderers = _renderers,
+        };
+
+        _audioSys = _entityManager.EntitySysManager.GetEntitySystem<AudioSystem>();
         _broadPhaseSystem = _entityManager.EntitySysManager.GetEntitySystem<SharedPhysicsSystem>();
-        _cfgMan.OnValueChanged(CVars.AudioRaycastLength, OnRaycastLengthChanged, true);
+        _xformSystem = _entityManager.System<SharedTransformSystem>();
+        _entityManager.GetEntityQuery<PhysicsComponent>();
+        _entityManager.GetEntityQuery<TransformComponent>();
 
         FluidsynthInitialized = true;
     }
 
-    private void OnRaycastLengthChanged(float value)
-    {
-        _maxCastLength = value;
-    }
-
     private void LoggerDelegate(NFluidsynth.Logger.LogLevel level, string message, IntPtr data)
     {
         var rLevel = level switch
@@ -211,7 +238,7 @@ internal sealed partial class MidiManager : IMidiManager
             NFluidsynth.Logger.LogLevel.Debug => LogLevel.Debug,
             _ => LogLevel.Debug
         };
-        _sawmill.Log(rLevel, message);
+        _fluidsynthSawmill.Log(rLevel, message);
     }
 
     public IMidiRenderer? GetNewRenderer(bool mono = true)
@@ -236,9 +263,9 @@ internal sealed partial class MidiManager : IMidiManager
         {
             soundfontLoader.SetCallbacks(_soundfontLoaderCallbacks);
 
-            var renderer = new MidiRenderer(_settings!, soundfontLoader, mono, this, _clydeAudio, _taskManager, _midiSawmill);
+            var renderer = new MidiRenderer(_settings!, soundfontLoader, mono, this, _audio, _taskManager, _midiSawmill);
 
-            _midiSawmill.Debug($"Loading soundfont {FallbackSoundfont}");
+            _midiSawmill.Debug($"Loading fallback soundfont {FallbackSoundfont}");
             // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
             renderer.LoadSoundfont(FallbackSoundfont);
 
@@ -252,8 +279,8 @@ internal sealed partial class MidiManager : IMidiManager
 
                     try
                     {
+                        _midiSawmill.Debug($"Loading OS soundfont {filepath}");
                         renderer.LoadSoundfont(filepath);
-                        _midiSawmill.Debug($"Loaded Linux soundfont {filepath}");
                     }
                     catch (Exception)
                     {
@@ -267,7 +294,7 @@ internal sealed partial class MidiManager : IMidiManager
             {
                 if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
                 {
-                    _midiSawmill.Debug($"Loading soundfont {OsxSoundfont}");
+                    _midiSawmill.Debug($"Loading OS soundfont {OsxSoundfont}");
                     renderer.LoadSoundfont(OsxSoundfont);
                 }
             }
@@ -275,7 +302,7 @@ internal sealed partial class MidiManager : IMidiManager
             {
                 if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
                 {
-                    _midiSawmill.Debug($"Loading soundfont {WindowsSoundfont}");
+                    _midiSawmill.Debug($"Loading OS soundfont {WindowsSoundfont}");
                     renderer.LoadSoundfont(WindowsSoundfont);
                 }
             }
@@ -286,31 +313,35 @@ internal sealed partial class MidiManager : IMidiManager
             {
                 if (File.Exists(soundfontOverride) && SoundFont.IsSoundFont(soundfontOverride))
                 {
-                    _midiSawmill.Debug($"Loading soundfont {soundfontOverride} from environment variable.");
+                    _midiSawmill.Debug($"Loading environment variable soundfont {soundfontOverride}");
                     renderer.LoadSoundfont(soundfontOverride);
                 }
             }
 
             // Load content-specific custom soundfonts, which should override the system/fallback soundfont.
-            _midiSawmill.Debug($"Loading soundfonts from {ContentCustomSoundfontDirectory}");
+            _midiSawmill.Debug($"Loading soundfonts from content directory {ContentCustomSoundfontDirectory}");
             foreach (var file in _resourceManager.ContentFindFiles(ContentCustomSoundfontDirectory))
             {
                 if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
-                _midiSawmill.Debug($"Loading soundfont {file}");
+                _midiSawmill.Debug($"Loading content soundfont {file}");
                 renderer.LoadSoundfont(file.ToString());
             }
 
+            var userDataPath = _resourceManager.UserData.RootDir == null
+                ? CustomSoundfontDirectory
+                : new ResPath(_resourceManager.UserData.RootDir) / CustomSoundfontDirectory.ToRelativePath();
+
             // Load every soundfont from the user data directory last, since those may override any other soundfont.
-            _midiSawmill.Debug($"Loading soundfonts from {{USERDATA}} {CustomSoundfontDirectory}");
-            var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath()}/*").Item1;
+            _midiSawmill.Debug($"Loading soundfonts from user data directory {userDataPath}");
+            var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath()}*").Item1;
             foreach (var file in enumerator)
             {
                 if (file.Extension != "sf2" && file.Extension != "dls" && file.Extension != "sf3") continue;
-                _midiSawmill.Debug($"Loading soundfont {{USERDATA}} {file}");
+                _midiSawmill.Debug($"Loading user soundfont {file}");
                 renderer.LoadSoundfont(file.ToString());
             }
 
-            renderer.Source.SetVolume(Volume);
+            renderer.Source.Gain = _gain;
 
             lock (_renderers)
             {
@@ -331,78 +362,127 @@ internal sealed partial class MidiManager : IMidiManager
             return;
         }
 
-        // Update positions of streams every frame.
+        if (_nextUpdate > _timing.RealTime)
+            return;
+
+        _nextUpdate = _timing.RealTime + _updateFrequency;
+
+        // Update positions of streams occasionally.
         // This has a lot of code duplication with AudioSystem.FrameUpdate(), and they should probably be combined somehow.
+        // so TRUE
 
-        lock (_renderers)
-        {
-            foreach (var renderer in _renderers)
-            {
-                if (renderer.Disposed)
-                    continue;
+        _updateJob.OurPosition = _audioSys.GetListenerCoordinates();
 
-                if(_volumeDirty)
-                    renderer.Source.SetVolume(Volume);
+        // This semaphore is here to avoid lock contention as much as possible.
+        _updateSemaphore.Wait();
 
-                if (!renderer.Mono)
-                {
-                    renderer.Source.SetGlobal();
-                    continue;
-                }
+        // The ONLY time this should be contested is with ThreadUpdate.
+        // If that becomes NOT the case then just lock this, remove the semaphore, and drop the update frequency even harder.
+        // ReSharper disable once InconsistentlySynchronizedField
+        _parallel.ProcessNow(_updateJob, _renderers.Count);
 
-                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 = pos.Position - _eyeManager.CurrentEye.Position.Position;
-                    var occlusion = 0f;
-                    if (sourceRelative.Length > 0)
-                    {
-                        occlusion = _broadPhaseSystem.IntersectRayPenetration(
-                            pos.MapId,
-                            new CollisionRay(
-                                _eyeManager.CurrentEye.Position.Position,
-                                sourceRelative.Normalized,
-                                OcclusionCollisionMask),
-                            MathF.Min(sourceRelative.Length, _maxCastLength),
-                            renderer.TrackingEntity);
-                    }
-
-                    renderer.Source.SetOcclusion(occlusion);
-
-                    if (!renderer.Source.SetPosition(pos.Position))
-                    {
-                        return;
-                    }
-
-                    if (trackingEntity)
-                    {
-                        var vel = _broadPhaseSystem.GetMapLinearVelocity(renderer.TrackingEntity!.Value);
-                        renderer.Source.SetVelocity(vel);
-                    }
-                }
-                else
-                {
-                    renderer.Source.SetOcclusion(float.MaxValue);
-                }
-            }
-        }
+        _updateSemaphore.Release();
 
         _volumeDirty = false;
     }
 
+    private void UpdateRenderer(IMidiRenderer renderer, MapCoordinates listener)
+    {
+        // TODO: This should be sharing more code with AudioSystem.
+        try
+        {
+            if (renderer.Disposed)
+                return;
+
+            if (_volumeDirty)
+            {
+                renderer.Source.Gain = Gain;
+            }
+
+            if (!renderer.Mono)
+            {
+                renderer.Source.Global = true;
+                return;
+            }
+
+            MapCoordinates mapPos;
+
+            if (renderer.TrackingEntity is {} trackedEntity && !_entityManager.Deleted(trackedEntity))
+            {
+                renderer.TrackingCoordinates = _xformSystem.GetMapCoordinates(renderer.TrackingEntity.Value);
+
+                // Pause it if the attached entity is paused.
+                if (_entityManager.IsPaused(renderer.TrackingEntity))
+                {
+                    renderer.Source.Pause();
+                    return;
+                }
+            }
+            else if (renderer.TrackingCoordinates == null)
+            {
+                renderer.Source.Pause();
+                return;
+            }
+
+            mapPos = renderer.TrackingCoordinates.Value;
+
+            // If it's on a different map then just mute it, not pause.
+            if (mapPos.MapId == MapId.Nullspace || mapPos.MapId != listener.MapId)
+            {
+                renderer.Source.Gain = 0f;
+                return;
+            }
+
+            // Was previously muted maybe so try unmuting it?
+            if (renderer.Source.Gain == 0f)
+            {
+                renderer.Source.Gain = Gain;
+            }
+
+            var worldPos = mapPos.Position;
+            var delta = worldPos - listener.Position;
+            var distance = delta.Length();
+
+            // Update position
+            // Out of range so just clip it for us.
+            if (distance > renderer.Source.MaxDistance)
+            {
+                // Still keeps the source playing, just with no volume.
+                renderer.Source.Gain = 0f;
+                return;
+            }
+
+            // Same imprecision suppression as audiosystem.
+            if (distance > 0f && distance < 0.01f)
+            {
+                worldPos = listener.Position;
+                delta = Vector2.Zero;
+                distance = 0f;
+            }
+
+            renderer.Source.Position = worldPos;
+
+            // Update velocity (doppler).
+            if (!_entityManager.Deleted(renderer.TrackingEntity))
+            {
+                var velocity = _broadPhaseSystem.GetMapLinearVelocity(renderer.TrackingEntity.Value);
+                renderer.Source.Velocity = velocity;
+            }
+            else
+            {
+                renderer.Source.Velocity = Vector2.Zero;
+            }
+
+            // Update occlusion
+            var occlusion = _audioSys.GetOcclusion(listener, delta, distance, renderer.TrackingEntity);
+            renderer.Source.Occlusion = occlusion;
+        }
+        catch (Exception ex)
+        {
+            _runtime.LogException(ex, _midiSawmill.Name);
+        }
+    }
+
     /// <summary>
     ///     Main method for the thread rendering the midi audio.
     /// </summary>
@@ -412,16 +492,39 @@ internal sealed partial class MidiManager : IMidiManager
         {
             lock (_renderers)
             {
+                var toRemove = new ValueList<IMidiRenderer>();
+
                 for (var i = 0; i < _renderers.Count; i++)
                 {
                     var renderer = _renderers[i];
-                    if (!renderer.Disposed)
-                        renderer.Render();
-                    else
+
+                    lock (renderer)
+                    {
+                        if (!renderer.Disposed)
+                        {
+                            if (renderer.Master is { Disposed: true })
+                                renderer.Master = null;
+
+                            renderer.Render();
+                        }
+                        else
+                        {
+                            toRemove.Add(renderer);
+                        }
+                    }
+                }
+
+                if (toRemove.Count > 0)
+                {
+                    _updateSemaphore.Wait();
+
+                    foreach (var renderer in toRemove)
                     {
                         renderer.InternalDispose();
                         _renderers.Remove(renderer);
                     }
+
+                    _updateSemaphore.Release();
                 }
             }
 
@@ -592,4 +695,31 @@ internal sealed partial class MidiManager : IMidiManager
 
         }
     }
+
+    #region Jobs
+
+    private record struct MidiUpdateJob : IParallelRobustJob
+    {
+        public int MinimumBatchParallel => 2;
+
+        public int BatchSize => 1;
+
+        public MidiManager Manager;
+
+        public MapCoordinates OurPosition;
+        public List<IMidiRenderer> Renderers;
+
+        public void Execute(int index)
+        {
+            // The indices shouldn't be able to be touched while this job is running, just the renderer itself getting locked.
+            var renderer = Renderers[index];
+
+            lock (renderer)
+            {
+                Manager.UpdateRenderer(renderer, OurPosition);
+            }
+        }
+    }
+
+    #endregion
 }