Version: 149.0.1

Undo change to violet color

add to named color list

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.Properties.targets

@@ -25,4 +25,7 @@
 
   <!-- analyzer -->
   <Import Project="Robust.Analyzers.targets" Condition="'$(SkipRobustAnalyzer)' != 'true'" />
+
+  <!-- serialization generator -->
+  <Import Project="Robust.Serialization.Generator.targets" />
 </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>

RELEASE-NOTES.md

@@ -54,6 +54,165 @@ END TEMPLATE-->
 *None yet*
 
 
+## 149.0.1
+
+### Bugfixes
+
+* Fix serialization sharing instances when copying data definitions and not assigning null when the source is null.
+* Fixed resizing a window to be bigger than its set maxsize crashing the client.
+
+
+## 149.0.0
+
+### Breaking changes
+
+* Data definitions must now be partial, their data fields must not be readonly and their data field properties must have a setter.
+
+### Internal
+
+* Copying data definitions through the serialization manager is now faster and consumes less memory.
+
+
+## 148.4.0
+
+### New features
+
+* Add recursive PVS overrides and remove IsOverride()
+
+
+## 148.3.0
+
+### New features
+
+* Happy eyeballs delay can be configured.
+* Added more colors.
+* Allow pre-startup components to be shut down.
+* Added tile texture reload command.
+* Add implementation of Random.Pick(ValueList<T> ..).
+* Add IntegrationInstance fields for common dependencies.
+
+### Bugfixes
+
+* Prevent invalid prototypes from being spawned.
+* Change default value of EntityLastModifiedTick from zero to one.
+* Make DiscordRichPresence icon CVars server-side with replication.
+
+
+## 148.2.0
+
+### New features
+
+* `SpinBox.LineEditControl` exposes the underlying `LineEdit`.
+* Add VV attributes to various fields across overlay and sessions.
+* Add IsPaused to EntityManager to check if an entity is paused.
+
+### Bugfixes
+
+* Fix SetActiveTheme not updating the theme.
+
+
+## 148.1.0
+
+### New features
+
+* Added IgnoreUIChecksComponent that lets entities ignore bound user interface range checks which would normally close the UI.
+* Add support for F16-F24 keybinds.
+
+### Bugfixes
+
+* Fix gamestate bug where PVS is disabled.
+
+### Other
+
+* EntityQuery.HasComponent override for nullable entity uids.
+
+
+## 148.0.0
+
+### Breaking changes
+
+* Several NuGet dependencies are now private assets.
+* Added `IViewportControl.PixelToMap()` and `PixelToMapEvent`. These are variants of the existing screen-to-map functions that should account for distortion effects.
+
+### New features
+
+* Added several new rich-text tags, including italic and bold-italic.
+
+### Bugfixes
+
+* Fixed log messages for unknown components not working due to threaded IoC issues.
+* Replay recordings no longer record invalid prototype uploads.
+
+
+## 147.0.0
+
+### Breaking changes
+
+* Renamed one of the EntitySystem.Dirty() methods to `DirtyEntity()` to avoid confusion with the component-dirtying methods.
+
+### New features
+
+* Added debug commands that return the entity system update order.
+
+### Bugfixes
+
+* Fixed a bug in MetaDataSystem that was causing the metadata component to not be marked as dirty.
+
+
+## 146.0.0
+
+### Breaking changes
+
+* Remove readOnly for DataFields and rename some ShaderPrototype C# fields internally to align with the normal schema.
+
+### Bugfixes
+
+* Add InvariantCulture to angle validation.
+
+### Internal
+
+* Add some additional EntityQuery<T> usages and remove a redundant CanCollide call on fixture shutdown.
+
+
+## 145.0.0
+
+### Breaking changes
+
+* Removed some old SpriteComponent data-fields ("rsi", and "layerDatums").
+
+### New features
+
+* Added `ActorSystem.TryGetActorFromUserId()`.
+* Added IPrototypeManager.EnumerateKinds().
+
+### Bugfixes
+
+* Fixed SpriteSpecifierSerializer yaml validation not working properly.
+* Fixed IoC/Threading exceptions in `Resource.Load()`.
+* Fixed `TransformSystem.SetCoordinates()` throwing uninformative client-side errors.
+* Fixed `IResourceManager.ContentFileExists()` and `TryContentFileRead()` throwing exceptions on windows when trying to open a directory.
+
+
+## 144.0.1
+
+### Bugfixes
+
+* Fix some EntityLookup queries incorrectly being double transformed internally.
+* Shrink TileEnlargement even further for EntityLookup default queries.
+
+
+## 144.0.0
+
+### Breaking changes
+
+* Add new args to entitylookup methods to allow for shrinkage of tile-bounds checks. Default changed to shrink the grid-local AABB by the polygon skin to avoid clipping neighboring tile entities.
+* Non-hard fixtures will no longer count by default for EntityLookup.
+
+### New features
+
+* Added new EntityLookup flag to return non-hard fixtures or not.
+
+
 ## 143.3.0
 
 ### New features
@@ -135,7 +294,7 @@ END TEMPLATE-->
 * `IHttpClientHolder` holds a shared `HttpClient` for use by content. It has Happy Eyeballs fixed and an appropriate `User-Agent`.
 * Added `DataNode.ToString()`. Makes it easier to save yaml files and debug code.
 * Added some cvars to modify discord rich presence icons.
-* .ogg files now read the `Artist` and `Title` tags and make them available via new fields in `AudioStream`. 
+* .ogg files now read the `Artist` and `Title` tags and make them available via new fields in `AudioStream`.
 * The default fragment shaders now have access to the local light level (`lowp vec3 lightSample`).
 * Added `IPrototypeManager.ValidateAllPrototypesSerializable()`, which can be used to check that all currently loaded prototypes can be serialised & deserialised.
 
@@ -144,7 +303,7 @@ END TEMPLATE-->
 * Fix certain debug commands and tools crashing on non-SS14 RobustToolbox games due to a missing font.
 * Discord rich presence strings are now truncated if they are too long.
 * Fixed a couple of broadphase/entity-lookup update bugs that were affecting containers and entities attached to other (non-grid/map) entities.
-* Fixed `INetChannel.Disconnect()` not properly disconnecting clients in integration tests. 
+* Fixed `INetChannel.Disconnect()` not properly disconnecting clients in integration tests.
 
 ### Other
 

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/Locale/en-US/commands.ftl

@@ -558,3 +558,6 @@ 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

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/toolshed-commands.ftl

@@ -161,3 +161,9 @@ 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-entitysystemupdateorder-tick =
+    Lists the tick update order of entity systems.
+
+command-description-entitysystemupdateorder-frame =
+    Lists the frame update order of entity systems.

Robust.Analyzers/DataDefinitionAnalyzer.cs

@@ -0,0 +1,293 @@
+#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;
+
+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.Analyzers.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/Diagnostics.cs

@@ -21,6 +21,10 @@ public static class Diagnostics
     public const string IdValueEventSubscribedByRef = "RA0014";
     public const string IdByRefEventRaisedByValue = "RA0015";
     public const string IdValueEventRaisedByRef = "RA0016";
+    public const string IdDataDefinitionPartial = "RA0017";
+    public const string IdNestedDataDefinitionPartial = "RA0018";
+    public const string IdDataFieldWritable = "RA0019";
+    public const string IdDataFieldPropertyWritable = "RA0020";
 
     public static SuppressionDescriptor MeansImplicitAssignment =>
         new SuppressionDescriptor("RADC1000", "CS0649", "Marked as implicitly assigned.");

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!;
@@ -48,7 +48,7 @@ public class AddRemoveComponentBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    public sealed partial class A : Component
     {
     }
 }

Robust.Benchmarks/EntityManager/ComponentIteratorBenchmark.cs

@@ -6,7 +6,7 @@ using Robust.UnitTesting.Server;
 
 namespace Robust.Benchmarks.EntityManager;
 
-public class ComponentIteratorBenchmark
+public partial class ComponentIteratorBenchmark
 {
     private ISimulation _simulation = default!;
     private IEntityManager _entityManager = default!;
@@ -69,7 +69,7 @@ public class ComponentIteratorBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    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!;
@@ -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!;
@@ -56,7 +56,7 @@ public class SpawnDeleteEntityBenchmark
     }
 
     [ComponentProtoName("A")]
-    public sealed class A : Component
+    public sealed partial class A : Component
     {
     }
 }

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.Client/ClientIoC.cs

@@ -68,6 +68,7 @@ namespace Robust.Client
             deps.Register<IComponentFactory, ComponentFactory>();
             deps.Register<ITileDefinitionManager, ClydeTileDefinitionManager>();
             deps.Register<IClydeTileDefinitionManager, ClydeTileDefinitionManager>();
+            deps.Register<ClydeTileDefinitionManager, ClydeTileDefinitionManager>();
             deps.Register<GameController, GameController>();
             deps.Register<IGameController, GameController>();
             deps.Register<IGameControllerInternal, GameController>();

Robust.Client/ComponentTrees/LightTreeComponent.cs

@@ -6,7 +6,7 @@ using Robust.Shared.Physics;
 namespace Robust.Client.ComponentTrees;
 
 [RegisterComponent]
-public sealed class LightTreeComponent: Component, IComponentTreeComponent<PointLightComponent>
+public sealed partial class LightTreeComponent: Component, IComponentTreeComponent<PointLightComponent>
 {
     public DynamicTree<ComponentTreeEntry<PointLightComponent>> Tree { get; set; } = default!;
 }

Robust.Client/ComponentTrees/SpriteTreeComponent.cs

@@ -6,7 +6,7 @@ using Robust.Shared.Physics;
 namespace Robust.Client.ComponentTrees;
 
 [RegisterComponent]
-public sealed class SpriteTreeComponent: Component, IComponentTreeComponent<SpriteComponent>
+public sealed partial class SpriteTreeComponent: Component, IComponentTreeComponent<SpriteComponent>
 {
     public DynamicTree<ComponentTreeEntry<SpriteComponent>> Tree { get; set; } = default!;
 }

Robust.Client/Console/Commands/Debug.cs

@@ -630,7 +630,7 @@ namespace Robust.Client.Console.Commands
 
         public override void Execute(IConsoleShell shell, string argStr, string[] args)
         {
-            var mousePos = _eye.ScreenToMap(_input.MouseScreenPosition);
+            var mousePos = _eye.PixelToMap(_input.MouseScreenPosition);
 
             if (!_map.TryFindGridAt(mousePos, out var gridUid, out var grid))
             {

Robust.Client/Debugging/DebugAnchoringSystem.cs

@@ -61,7 +61,7 @@ namespace Robust.Client.Debugging
             }
 
             var mouseSpot = _inputManager.MouseScreenPosition;
-            var spot = _eyeManager.ScreenToMap(mouseSpot);
+            var spot = _eyeManager.PixelToMap(mouseSpot);
 
             if (!_mapManager.TryFindGridAt(spot, out var gridUid, out var grid))
             {

Robust.Client/Debugging/DebugPhysicsSystem.cs

@@ -371,7 +371,7 @@ namespace Robust.Client.Debugging
             if ((_debugPhysicsSystem.Flags & PhysicsDebugFlags.ShapeInfo) != 0x0)
             {
                 var hoverBodies = new List<PhysicsComponent>();
-                var bounds = Box2.UnitCentered.Translated(_eyeManager.ScreenToMap(mousePos.Position).Position);
+                var bounds = Box2.UnitCentered.Translated(_eyeManager.PixelToMap(mousePos.Position).Position);
 
                 foreach (var physBody in _physicsSystem.GetCollidingEntities(mapId, bounds))
                 {
@@ -404,7 +404,7 @@ namespace Robust.Client.Debugging
 
             if ((_debugPhysicsSystem.Flags & PhysicsDebugFlags.Distance) != 0x0)
             {
-                var mapPos = _eyeManager.ScreenToMap(mousePos);
+                var mapPos = _eyeManager.PixelToMap(mousePos);
 
                 if (mapPos.MapId != args.MapId)
                     return;

Robust.Client/GameObjects/Components/Animations/AnimationPlayerComponent.cs

@@ -11,7 +11,7 @@ namespace Robust.Client.GameObjects
     ///     Plays back <see cref="Animation"/>s on entities.
     /// </summary>
     [RegisterComponent]
-    public sealed class AnimationPlayerComponent : Component
+    public sealed partial class AnimationPlayerComponent : Component
     {
         // TODO: Give this component a friend someday. Way too much content shit to change atm ._.
 

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

@@ -11,7 +11,7 @@ namespace Robust.Client.GameObjects;
 /// </summary>
 [RegisterComponent]
 [Access(typeof(GenericVisualizerSystem))]
-public sealed class GenericVisualizerComponent : Component
+public sealed partial class GenericVisualizerComponent : Component
 {
     /// <summary>
     ///     This is a nested dictionary that maps appearance data keys -> sprite layer keys -> appearance data values -> layer data.

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

@@ -10,7 +10,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Client.GameObjects
 {
     [RegisterComponent, ComponentReference(typeof(SharedEyeComponent))]
-    public sealed class EyeComponent : SharedEyeComponent
+    public sealed partial class EyeComponent : SharedEyeComponent
     {
         [Dependency] private readonly IEyeManager _eyeManager = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;

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

@@ -16,8 +16,8 @@ namespace Robust.Client.GameObjects;
 /// updated.
 /// </remarks>
 [RegisterComponent]
-public sealed class IconComponent : Component
+public sealed partial class IconComponent : Component
 {
     [IncludeDataField]
-    public readonly SpriteSpecifier.Rsi Icon = default!;
+    public SpriteSpecifier.Rsi Icon = default!;
 }

Robust.Client/GameObjects/Components/Input/InputComponent.cs

@@ -9,7 +9,7 @@ namespace Robust.Client.GameObjects
     ///     Defines data fields used in the <see cref="InputSystem"/>.
     /// </summary>
     [RegisterComponent]
-    public sealed class InputComponent : Component
+    public sealed partial class InputComponent : Component
     {
         /// <summary>
         ///     The context that will be made active for a client that attaches to this entity.

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

@@ -12,7 +12,7 @@ namespace Robust.Client.GameObjects
 {
     [RegisterComponent]
     [ComponentReference(typeof(SharedPointLightComponent))]
-    public sealed class PointLightComponent : SharedPointLightComponent, IComponentTreeEntry<PointLightComponent>
+    public sealed partial class PointLightComponent : SharedPointLightComponent, IComponentTreeEntry<PointLightComponent>
     {
         public EntityUid? TreeUid { get; set; }
 

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

@@ -4,7 +4,7 @@ using Robust.Shared.Maths;
 
 namespace Robust.Client.GameObjects
 {
-    public interface IRenderableComponent : IComponent
+    public partial interface IRenderableComponent : IComponent
     {
         int DrawDepth { get; set; }
         float Bottom { get; }

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

@@ -32,7 +32,7 @@ using static Robust.Shared.Serialization.TypeSerializers.Implementations.SpriteS
 namespace Robust.Client.GameObjects
 {
     [RegisterComponent]
-    public sealed class SpriteComponent : Component, IComponentDebug, ISerializationHooks, IComponentTreeEntry<SpriteComponent>, IAnimationProperties
+    public sealed partial class SpriteComponent : Component, IComponentDebug, ISerializationHooks, IComponentTreeEntry<SpriteComponent>, IAnimationProperties
     {
         [Dependency] private readonly IResourceCache resourceCache = default!;
         [Dependency] private readonly IPrototypeManager prototypes = default!;
@@ -167,40 +167,9 @@ namespace Robust.Client.GameObjects
 
         public bool TreeUpdateQueued { get; set; }
 
-        [DataField("layerDatums")]
-        private List<PrototypeLayerData> LayerDatums
-        {
-            get
-            {
-                var layerDatums = new List<PrototypeLayerData>();
-                foreach (var layer in Layers)
-                {
-                    layerDatums.Add(layer.ToPrototypeData());
-                }
-
-                return layerDatums;
-            }
-            set
-            {
-                if (value == null) return;
-
-                Layers.Clear();
-                foreach (var layerDatum in value)
-                {
-                    AddLayer(layerDatum);
-                }
-
-                _layerMapShared = true;
-
-                QueueUpdateRenderTree();
-                QueueUpdateIsInert();
-            }
-        }
-
         private RSI? _baseRsi;
 
         [ViewVariables(VVAccess.ReadWrite)]
-        [DataField("rsi", priority: 2)]
         public RSI? BaseRSI
         {
             get => _baseRsi;
@@ -357,7 +326,16 @@ namespace Robust.Client.GameObjects
             if (layerDatums.Count != 0)
             {
                 LayerMap.Clear();
-                LayerDatums = layerDatums;
+                Layers.Clear();
+                foreach (var datum in layerDatums)
+                {
+                    AddLayer(datum);
+                }
+
+                _layerMapShared = true;
+
+                QueueUpdateRenderTree();
+                QueueUpdateIsInert();
             }
 
             UpdateLocalMatrix();

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

@@ -7,7 +7,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Client.GameObjects
 {
     [RegisterComponent, ComponentReference(typeof(SharedUserInterfaceComponent))]
-    public sealed class ClientUserInterfaceComponent : SharedUserInterfaceComponent
+    public sealed partial class ClientUserInterfaceComponent : SharedUserInterfaceComponent
     {
         [ViewVariables]
         internal readonly Dictionary<Enum, PrototypeData> _interfaces = new();

Robust.Client/Graphics/ClientEye/EyeManager.cs

@@ -24,6 +24,7 @@ namespace Robust.Client.Graphics
         [Dependency] private readonly IClyde _displayManager = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;
         [Dependency] private readonly IUserInterfaceManager _uiManager = default!;
+        private ISawmill _logMill = default!;
 
         // We default to this when we get set to a null eye.
         private readonly FixedEye _defaultEye = new();
@@ -53,6 +54,7 @@ namespace Robust.Client.Graphics
         void IEyeManager.Initialize()
         {
             MainViewport = _uiManager.MainViewport;
+            _logMill = IoCManager.Resolve<ILogManager>().RootSawmill;
         }
 
         /// <inheritdoc />
@@ -129,14 +131,14 @@ namespace Robust.Client.Graphics
         /// <inheritdoc />
         public ScreenCoordinates CoordinatesToScreen(EntityCoordinates point)
         {
-            return MapToScreen(point.ToMap(_entityManager));
+            return MapToScreen(point.ToMap(_entityManager, _entityManager.System<SharedTransformSystem>()));
         }
 
         public ScreenCoordinates MapToScreen(MapCoordinates point)
         {
             if (CurrentEye.Position.MapId != point.MapId)
             {
-                Logger.Error($"Attempted to convert map coordinates ({point}) to screen coordinates with an eye on another map ({CurrentEye.Position.MapId})");
+                _logMill.Error($"Attempted to convert map coordinates ({point}) to screen coordinates with an eye on another map ({CurrentEye.Position.MapId})");
                 return new(default, WindowId.Invalid);
             }
 
@@ -146,12 +148,10 @@ namespace Robust.Client.Graphics
         /// <inheritdoc />
         public MapCoordinates ScreenToMap(ScreenCoordinates point)
         {
-            var (pos, window) = point;
-
             if (_uiManager.MouseGetControl(point) is not IViewportControl viewport)
                 return default;
 
-            return viewport.ScreenToMap(pos);
+            return viewport.ScreenToMap(point.Position);
         }
 
         /// <inheritdoc />
@@ -159,6 +159,21 @@ namespace Robust.Client.Graphics
         {
             return MainViewport.ScreenToMap(point);
         }
+
+        /// <inheritdoc />
+        public MapCoordinates PixelToMap(ScreenCoordinates point)
+        {
+            if (_uiManager.MouseGetControl(point) is not IViewportControl viewport)
+                return default;
+
+            return viewport.PixelToMap(point.Position);
+        }
+
+        /// <inheritdoc />
+        public MapCoordinates PixelToMap(Vector2 point)
+        {
+            return MainViewport.PixelToMap(point);
+        }
     }
 
     public sealed class CurrentEyeChangedEvent : EntityEventArgs

Robust.Client/Graphics/ClientEye/IEyeManager.cs

@@ -79,6 +79,16 @@ namespace Robust.Client.Graphics
         /// <returns>Corresponding point in the world.</returns>
         MapCoordinates ScreenToMap(Vector2 point);
 
+        /// <summary>
+        /// Similar to <see cref="ScreenToMap(ScreenCoordinates)"/>, except it should compensate for the effects of shaders on viewports.
+        /// </summary>
+        MapCoordinates PixelToMap(ScreenCoordinates point);
+
+        /// <summary>
+        /// Similar to <see cref="ScreenToMap(Vector2)"/>, except it should compensate for the effects of shaders on viewports.
+        /// </summary>
+        MapCoordinates PixelToMap(Vector2 point);
+
         void ClearCurrentEye();
         void Initialize();
     }

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

@@ -207,6 +207,15 @@ namespace Robust.Client.Graphics.Clyde
                     {GlfwKey.F13, Key.F13},
                     {GlfwKey.F14, Key.F14},
                     {GlfwKey.F15, Key.F15},
+                    {GlfwKey.F16, Key.F16},
+                    {GlfwKey.F17, Key.F17},
+                    {GlfwKey.F18, Key.F18},
+                    {GlfwKey.F19, Key.F19},
+                    {GlfwKey.F20, Key.F20},
+                    {GlfwKey.F21, Key.F21},
+                    {GlfwKey.F22, Key.F22},
+                    {GlfwKey.F23, Key.F23},
+                    {GlfwKey.F24, Key.F24},
                     {GlfwKey.Pause, Key.Pause},
                     {GlfwKey.World1, Key.World1},
                 };

Robust.Client/Graphics/Clyde/Windowing/Sdl2.Keys.cs

@@ -191,6 +191,15 @@ internal partial class Clyde
             MapKey(SDL_SCANCODE_F13, Key.F13);
             MapKey(SDL_SCANCODE_F14, Key.F14);
             MapKey(SDL_SCANCODE_F15, Key.F15);
+            MapKey(SDL_SCANCODE_F16, Key.F16);
+            MapKey(SDL_SCANCODE_F17, Key.F17);
+            MapKey(SDL_SCANCODE_F18, Key.F18);
+            MapKey(SDL_SCANCODE_F19, Key.F19);
+            MapKey(SDL_SCANCODE_F20, Key.F20);
+            MapKey(SDL_SCANCODE_F21, Key.F21);
+            MapKey(SDL_SCANCODE_F22, Key.F22);
+            MapKey(SDL_SCANCODE_F23, Key.F23);
+            MapKey(SDL_SCANCODE_F24, Key.F24);
             MapKey(SDL_SCANCODE_PAUSE, Key.Pause);
 
             KeyMapReverse = new Dictionary<Key, SDL_Scancode>();

Robust.Client/Graphics/Overlays/OverlayManager.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.CodeAnalysis;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Timing;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.Graphics
 {
@@ -11,6 +12,7 @@ namespace Robust.Client.Graphics
     {
         [Dependency] private readonly ILogManager _logMan = default!;
 
+        [ViewVariables]
         private readonly Dictionary<Type, Overlay> _overlays = new Dictionary<Type, Overlay>();
         private ISawmill _logger = default!;
 

Robust.Client/Graphics/Shaders/ShaderInstance.cs

@@ -225,7 +225,7 @@ namespace Robust.Client.Graphics
     }
 
     [DataDefinition]
-    public struct StencilParameters
+    public partial struct StencilParameters
     {
         public StencilParameters()
         {

Robust.Client/Graphics/Shaders/ShaderPrototype.cs

@@ -20,8 +20,8 @@ namespace Robust.Client.Graphics
     public sealed class ShaderPrototype : IPrototype, ISerializationHooks
     {
         [ViewVariables]
-        [IdDataFieldAttribute]
-        public string ID { get; } = default!;
+        [IdDataField]
+        public string ID { get; private set; } = default!;
 
         [ViewVariables] private ShaderKind Kind;
         [ViewVariables] private Dictionary<string, object>? _params;
@@ -65,12 +65,12 @@ namespace Robust.Client.Graphics
 
                 case ShaderKind.Canvas:
 
-                    var hasLight = rawMode != "unshaded";
+                    var hasLight = _rawMode != "unshaded";
                     ShaderBlendMode? blend = null;
-                    if (rawBlendMode != null)
+                    if (_rawBlendMode != null)
                     {
-                        if (!Enum.TryParse<ShaderBlendMode>(rawBlendMode.ToUpper(), out var parsed))
-                            Logger.Error($"invalid mode: {rawBlendMode}");
+                        if (!Enum.TryParse<ShaderBlendMode>(_rawBlendMode.ToUpper(), out var parsed))
+                            Logger.Error($"invalid mode: {_rawBlendMode}");
                         else
                             blend = parsed;
                     }
@@ -94,11 +94,20 @@ namespace Robust.Client.Graphics
             return Instance().Duplicate();
         }
 
-        [DataField("kind", readOnly: true, required: true)] private string _rawKind = default!;
-        [DataField("path", readOnly: true)] private ResPath path;
-        [DataField("params", readOnly: true)] private Dictionary<string, string>? paramMapping;
-        [DataField("light_mode", readOnly: true)] private string? rawMode;
-        [DataField("blend_mode", readOnly: true)] private string? rawBlendMode;
+        [DataField("kind", required: true)]
+        private string _rawKind = default!;
+
+        [DataField("path")]
+        private ResPath? _path;
+
+        [DataField("params")]
+        private Dictionary<string, string>? _paramMapping;
+
+        [DataField("light_mode")]
+        private string? _rawMode;
+
+        [DataField("blend_mode")]
+        private string? _rawBlendMode;
 
         void ISerializationHooks.AfterDeserialization()
         {
@@ -106,18 +115,22 @@ namespace Robust.Client.Graphics
             {
                 case "source":
                     Kind = ShaderKind.Source;
-                    if (path == null) throw new InvalidOperationException();
-                    _source = IoCManager.Resolve<IResourceCache>().GetResource<ShaderSourceResource>(path);
 
-                    if (paramMapping != null)
+                    // TODO use a custom type serializer.
+                    if (_path == null)
+                        throw new InvalidOperationException("Source shaders must specify a source file.");
+
+                    _source = IoCManager.Resolve<IResourceCache>().GetResource<ShaderSourceResource>(_path.Value);
+
+                    if (_paramMapping != null)
                     {
                         _params = new Dictionary<string, object>();
-                        foreach (var item in paramMapping!)
+                        foreach (var item in _paramMapping!)
                         {
                             var name = item.Key;
                             if (!_source.ParsedShader.Uniforms.TryGetValue(name, out var uniformDefinition))
                             {
-                                Logger.ErrorS("shader", "Shader param '{0}' does not exist on shader '{1}'", name, path);
+                                Logger.ErrorS("shader", "Shader param '{0}' does not exist on shader '{1}'", name, _path);
                                 continue;
                             }
 

Robust.Client/Input/InputDevices.cs

@@ -161,6 +161,15 @@ namespace Robust.Client.Input
             F13,
             F14,
             F15,
+            F16,
+            F17,
+            F18,
+            F19,
+            F20,
+            F21,
+            F22,
+            F23,
+            F24,
             Pause,
             World1,
         }

Robust.Client/Input/KeyBindingRegistration.cs

@@ -4,7 +4,7 @@ using Robust.Shared.Serialization.Manager.Attributes;
 namespace Robust.Client.Input
 {
     [DataDefinition]
-    public sealed class KeyBindingRegistration
+    public sealed partial class KeyBindingRegistration
     {
         [DataField("function")]
         public BoundKeyFunction Function;

Robust.Client/Map/ClydeTileDefinitionManager.cs

@@ -3,13 +3,16 @@ using System.Collections.Generic;
 using System.Linq;
 using Robust.Client.GameObjects;
 using Robust.Client.Graphics;
+using Robust.Client.Map;
 using Robust.Client.ResourceManagement;
 using Robust.Client.Utility;
+using Robust.Shared.Console;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
+using Robust.Shared.Toolshed;
 using Robust.Shared.Utility;
 using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
@@ -52,8 +55,11 @@ namespace Robust.Client.Map
             _genTextureAtlas();
         }
 
-        private void _genTextureAtlas()
+        internal void _genTextureAtlas()
         {
+            _tileRegions.Clear();
+            _tileTextureAtlas = null;
+
             var defList = TileDefs.Where(t => t.Sprite != null).ToList();
 
             // If there are no tile definitions, we do nothing.
@@ -144,4 +150,17 @@ namespace Robust.Client.Map
             _tileTextureAtlas = Texture.LoadFromImage(sheet, "Tile Atlas");
         }
     }
+
+    public sealed class ReloadTileTexturesCommand : LocalizedCommands
+    {
+        [Dependency] private readonly ClydeTileDefinitionManager _tile = default!;
+
+        public override string Command => "reloadtiletextures";
+
+        public override void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            _tile._genTextureAtlas();
+        }
+    }
 }
+

Robust.Client/Physics/PredictedPhysicsComponent.cs

@@ -6,6 +6,6 @@ namespace Robust.Client.Physics;
 ///     Simple component used to tag entities that have physics prediction enabled.
 /// </summary>
 [RegisterComponent]
-public sealed class PredictedPhysicsComponent : Component
+public sealed partial class PredictedPhysicsComponent : Component
 {
 }

Robust.Client/Placement/PlacementManager.cs

@@ -532,7 +532,7 @@ namespace Robust.Client.Placement
                     return false;
                 }
                 coordinates = EntityCoordinates.FromMap(MapManager,
-                                                        EyeManager.ScreenToMap(InputManager.MouseScreenPosition));
+                                                        EyeManager.PixelToMap(InputManager.MouseScreenPosition));
                 return true;
             }
         }

Robust.Client/Placement/PlacementMode.cs

@@ -134,7 +134,7 @@ namespace Robust.Client.Placement
         public IEnumerable<EntityCoordinates> LineCoordinates()
         {
             var mouseScreen = pManager.InputManager.MouseScreenPosition;
-            var mousePos = pManager.EyeManager.ScreenToMap(mouseScreen);
+            var mousePos = pManager.EyeManager.PixelToMap(mouseScreen);
 
             if (mousePos.MapId == MapId.Nullspace)
                 yield break;
@@ -165,7 +165,7 @@ namespace Robust.Client.Placement
         public IEnumerable<EntityCoordinates> GridCoordinates()
         {
             var mouseScreen = pManager.InputManager.MouseScreenPosition;
-            var mousePos = pManager.EyeManager.ScreenToMap(mouseScreen);
+            var mousePos = pManager.EyeManager.PixelToMap(mouseScreen);
 
             if (mousePos.MapId == MapId.Nullspace)
                 yield break;
@@ -254,7 +254,7 @@ namespace Robust.Client.Placement
 
         protected EntityCoordinates ScreenToCursorGrid(ScreenCoordinates coords)
         {
-            var mapCoords = pManager.EyeManager.ScreenToMap(coords.Position);
+            var mapCoords = pManager.EyeManager.PixelToMap(coords.Position);
             if (!pManager.MapManager.TryFindGridAt(mapCoords, out var gridUid, out var grid))
             {
                 return EntityCoordinates.FromMap(pManager.MapManager, mapCoords);

Robust.Client/Player/IPlayerManager.cs

@@ -3,14 +3,18 @@ using System.Collections.Generic;
 using Robust.Shared.GameStates;
 using Robust.Shared.Network;
 using Robust.Shared.Players;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.Player
 {
     public interface IPlayerManager : Shared.Players.ISharedPlayerManager
     {
         new IEnumerable<ICommonSession> Sessions { get; }
+
+        [ViewVariables]
         IReadOnlyDictionary<NetUserId, ICommonSession> SessionsDict { get; }
 
+        [ViewVariables]
         LocalPlayer? LocalPlayer { get; }
 
         /// <summary>

Robust.Client/Player/PlayerSession.cs

@@ -2,6 +2,7 @@ using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Network;
 using Robust.Shared.Players;
+using Robust.Shared.ViewVariables;
 
 namespace Robust.Client.Player
 {
@@ -17,11 +18,14 @@ namespace Robust.Client.Player
         }
 
         /// <inheritdoc />
+        [ViewVariables]
         public EntityUid? AttachedEntity { get; set; }
 
         /// <inheritdoc />
+        [ViewVariables]
         public NetUserId UserId { get; }
 
+        [ViewVariables]
         internal string Name { get; set; } = "<Unknown>";
 
         /// <inheritdoc />
@@ -31,9 +35,11 @@ namespace Robust.Client.Player
             set => this.Name = value;
         }
 
+        [ViewVariables]
         internal short Ping { get; set; }
 
         /// <inheritdoc />
+        [ViewVariables]
         public INetChannel ConnectedClient { get; internal set; } = null!;
 
         /// <inheritdoc />

Robust.Client/Replays/Loading/ReplayLoadManager.Checkpoints.cs

@@ -7,6 +7,7 @@ using Robust.Shared.Network;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using System.Threading.Tasks;
+using Robust.Client.Upload.Commands;
 using Robust.Shared;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Replays;
@@ -250,36 +251,56 @@ public sealed partial class ReplayLoadManager
                 continue;
 
             message.Messages.RemoveSwap(i);
-            var changed = new Dictionary<Type, HashSet<string>>();
-            _protoMan.LoadString(protoUpload.PrototypeData, true, changed);
 
-            foreach (var (kind, ids) in changed)
+            try
             {
-                var protos = prototypes[kind];
-                var count = protos.Count;
-                protos.UnionWith(ids);
-                if (!ignoreDuplicates && ids.Count + count != protos.Count)
-                {
-                    // An existing prototype was overwritten. Much like for resource uploading, supporting this
-                    // requires tracking the last-modified time of prototypes and either resetting or applying
-                    // prototype changes when jumping around in time. This also requires reworking how the initial
-                    // implicit state data is generated, because we can't simply cache it anymore.
-                    // Also, does reloading prototypes in release mode modify existing entities?
-
-                    var msg = $"Overwriting an existing prototype! Kind: {kind.Name}. Ids: {string.Join(", ", ids)}";
-                    if (_confMan.GetCVar(CVars.ReplayIgnoreErrors))
-                        _sawmill.Error(msg);
-                    else
-                        throw new NotSupportedException(msg);
-                }
+                LoadPrototype(protoUpload.PrototypeData, prototypes, ignoreDuplicates);
             }
+            catch (Exception e)
+            {
+                if (e is NotSupportedException || !_confMan.GetCVar(CVars.ReplayIgnoreErrors))
+                    throw;
 
-            _protoMan.ResolveResults();
-            _protoMan.ReloadPrototypes(changed);
-            _locMan.ReloadLocalizations();
+                var msg = $"Caught exception while parsing uploaded prototypes in a replay. Exception: {e}";
+                _sawmill.Error(msg);
+            }
         }
     }
 
+    private void LoadPrototype(
+        string data,
+        Dictionary<Type, HashSet<string>> prototypes,
+        bool ignoreDuplicates)
+    {
+        var changed = new Dictionary<Type, HashSet<string>>();
+        _protoMan.LoadString(data, true, changed);
+
+        foreach (var (kind, ids) in changed)
+        {
+            var protos = prototypes[kind];
+            var count = protos.Count;
+            protos.UnionWith(ids);
+            if (!ignoreDuplicates && ids.Count + count != protos.Count)
+            {
+                // An existing prototype was overwritten. Much like for resource uploading, supporting this
+                // requires tracking the last-modified time of prototypes and either resetting or applying
+                // prototype changes when jumping around in time. This also requires reworking how the initial
+                // implicit state data is generated, because we can't simply cache it anymore.
+                // Also, does reloading prototypes in release mode modify existing entities?
+
+                var msg = $"Overwriting an existing prototype! Kind: {kind.Name}. Ids: {string.Join(", ", ids)}";
+                if (_confMan.GetCVar(CVars.ReplayIgnoreErrors))
+                    _sawmill.Error(msg);
+                else
+                    throw new NotSupportedException(msg);
+            }
+        }
+
+        _protoMan.ResolveResults();
+        _protoMan.ReloadPrototypes(changed);
+        _locMan.ReloadLocalizations();
+    }
+
     private void UpdateDeletions(NetListAsArray<EntityUid> entityDeletions,
         Dictionary<EntityUid, EntityState> entStates, HashSet<EntityUid> detached)
     {

Robust.Client/ResourceManagement/IResourceCache.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using Robust.Client.Graphics;
 using Robust.Shared.ContentPack;
 using Robust.Shared.Utility;
 
@@ -40,5 +41,9 @@ namespace Robust.Client.ResourceManagement
         // Resource load callbacks so content can hook stuff like click maps.
         event Action<TextureLoadedEventArgs> OnRawTextureLoaded;
         event Action<RsiLoadedEventArgs> OnRsiLoaded;
+        
+        IClyde Clyde { get; }
+        IClydeAudio ClydeAudio { get; }
+        IFontManager FontManager { get; }
     }
 }

Robust.Client/ResourceManagement/ResourceCache.Preload.cs

@@ -18,7 +18,9 @@ namespace Robust.Client.ResourceManagement
 {
     internal partial class ResourceCache
     {
-        [Dependency] private readonly IClyde _clyde = default!;
+        [field: Dependency] public IClyde Clyde { get; } = default!;
+        [field: Dependency] public IClydeAudio ClydeAudio { get; } = default!;
+        [field: Dependency] public IFontManager FontManager { get; } = default!;
         [Dependency] private readonly ILogManager _logManager = default!;
         [Dependency] private readonly IConfigurationManager _configurationManager = default!;
 
@@ -70,7 +72,7 @@ namespace Robust.Client.ResourceManagement
 
                 try
                 {
-                    TextureResource.LoadTexture(_clyde, data);
+                    TextureResource.LoadTexture(Clyde, data);
                 }
                 catch (Exception e)
                 {
@@ -198,7 +200,7 @@ namespace Robust.Client.ResourceManagement
 
             void FinalizeMetaAtlas(int toIndex, Image<Rgba32> sheet)
             {
-                var atlas = _clyde.LoadTextureFromImage(sheet);
+                var atlas = Clyde.LoadTextureFromImage(sheet);
                 for (int i = finalized + 1; i <= toIndex; i++)
                 {
                     var rsi = rsiList[i];

Robust.Client/ResourceManagement/ResourceTypes/AudioResource.cs

@@ -20,14 +20,13 @@ namespace Robust.Client.ResourceManagement
 
             using (var fileStream = cache.ContentFileRead(path))
             {
-                var clyde = IoCManager.Resolve<IClydeAudio>();
                 if (path.Extension == "ogg")
                 {
-                    AudioStream = clyde.LoadAudioOggVorbis(fileStream, path.ToString());
+                    AudioStream = cache.ClydeAudio.LoadAudioOggVorbis(fileStream, path.ToString());
                 }
                 else if (path.Extension == "wav")
                 {
-                    AudioStream = clyde.LoadAudioWav(fileStream, path.ToString());
+                    AudioStream = cache.ClydeAudio.LoadAudioWav(fileStream, path.ToString());
                 }
                 else
                 {

Robust.Client/ResourceManagement/ResourceTypes/FontResource.cs

@@ -18,7 +18,7 @@ namespace Robust.Client.ResourceManagement
 
             using (stream)
             {
-                FontFaceHandle = IoCManager.Resolve<IFontManagerInternal>().Load(stream);
+                FontFaceHandle = ((IFontManagerInternal)cache.FontManager).Load(stream);
             }
         }
 

Robust.Client/ResourceManagement/ResourceTypes/RSIResource.cs

@@ -34,12 +34,10 @@ namespace Robust.Client.ResourceManagement
 
         public override void Load(IResourceCache cache, ResPath path)
         {
-            var clyde = IoCManager.Resolve<IClyde>();
-
             var loadStepData = new LoadStepData {Path = path};
             LoadPreTexture(cache, loadStepData);
 
-            loadStepData.AtlasTexture = clyde.LoadTextureFromImage(
+            loadStepData.AtlasTexture = cache.Clyde.LoadTextureFromImage(
                 loadStepData.AtlasSheet,
                 loadStepData.Path.ToString());
 

Robust.Client/ResourceManagement/ResourceTypes/ShaderSourceResource.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using System.Threading;
 using Robust.Client.Graphics;
+using Robust.Client.Graphics.Clyde;
 using Robust.Shared.ContentPack;
 using Robust.Shared.IoC;
 using Robust.Shared.Utility;
@@ -27,8 +28,7 @@ namespace Robust.Client.ResourceManagement
                 ParsedShader = ShaderParser.Parse(reader, cache);
             }
 
-            var clyde = IoCManager.Resolve<IClydeInternal>();
-            ClydeHandle = clyde.LoadShader(ParsedShader, path.ToString());
+            ClydeHandle = ((IClydeInternal)cache.Clyde).LoadShader(ParsedShader, path.ToString());
         }
 
         public override void Reload(IResourceCache cache, ResPath path, CancellationToken ct = default)
@@ -57,8 +57,7 @@ namespace Robust.Client.ResourceManagement
                 }
             }
 
-            var clyde = IoCManager.Resolve<IClydeInternal>();
-            clyde.ReloadShader(ClydeHandle, ParsedShader);
+            ((IClydeInternal)cache.Clyde).ReloadShader(ClydeHandle, ParsedShader);
         }
     }
 }

Robust.Client/ResourceManagement/ResourceTypes/TextureResource.cs

@@ -20,8 +20,6 @@ namespace Robust.Client.ResourceManagement
 
         public override void Load(IResourceCache cache, ResPath path)
         {
-            var clyde = IoCManager.Resolve<IClyde>();
-
             if (path.Directory.Filename.EndsWith(".rsi"))
             {
                 Logger.WarningS(
@@ -33,7 +31,7 @@ namespace Robust.Client.ResourceManagement
             var data = new LoadStepData {Path = path};
 
             LoadPreTexture(cache, data);
-            LoadTexture(clyde, data);
+            LoadTexture(cache.Clyde, data);
             LoadFinish(cache, data);
         }
 

Robust.Client/Robust.Client.csproj

@@ -10,25 +10,26 @@
     <RobustILLink>true</RobustILLink>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="DiscordRichPresence" Version="1.0.175" />
+    <PackageReference Include="DiscordRichPresence" Version="1.0.175" PrivateAssets="compile" />
     <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.Data.Sqlite.Core" Version="6.0.9" />
-    <PackageReference Include="SQLitePCLRaw.provider.sqlite3" Version="2.1.2" Condition="'$(UseSystemSqlite)' == 'True'" />
-    <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.2" Condition="'$(UseSystemSqlite)' != 'True'" />
-    <PackageReference Include="SpaceWizards.NFluidsynth" Version="0.1.1" />
-    <PackageReference Include="NVorbis" Version="0.10.1" />
+    <PackageReference Include="Microsoft.Data.Sqlite.Core" Version="6.0.9" PrivateAssets="compile" />
+    <PackageReference Include="SQLitePCLRaw.provider.sqlite3" Version="2.1.2" Condition="'$(UseSystemSqlite)' == 'True'" PrivateAssets="compile" />
+    <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.2" Condition="'$(UseSystemSqlite)' != 'True'" PrivateAssets="compile" />
+    <PackageReference Include="SpaceWizards.NFluidsynth" Version="0.1.1" PrivateAssets="compile" />
+    <PackageReference Include="NVorbis" Version="0.10.1" PrivateAssets="compile" />
     <PackageReference Include="SixLabors.ImageSharp" Version="2.1.3" />
-    <PackageReference Include="OpenToolkit.Graphics" Version="4.0.0-pre9.1" />
-    <PackageReference Include="OpenTK.OpenAL" Version="4.7.5" />
-    <PackageReference Include="SpaceWizards.SharpFont" Version="1.0.1" />
+    <PackageReference Include="OpenToolkit.Graphics" Version="4.0.0-pre9.1" PrivateAssets="compile" />
+    <PackageReference Include="OpenTK.OpenAL" Version="4.7.5" PrivateAssets="compile" />
+    <PackageReference Include="SpaceWizards.SharpFont" Version="1.0.1" PrivateAssets="compile" />
     <PackageReference Include="Robust.Natives" Version="0.1.1" />
-    <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.20348-rc2" />
-    <PackageReference Condition="'$(FullRelease)' != 'True'" Include="JetBrains.Profiler.Api" Version="1.2.0" />
+    <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.20348-rc2" PrivateAssets="compile" />
+    <PackageReference Condition="'$(FullRelease)' != 'True'" Include="JetBrains.Profiler.Api" Version="1.2.0" PrivateAssets="compile" />
+    <PackageReference Include="SpaceWizards.Sodium" Version="0.2.1" PrivateAssets="compile" />
   </ItemGroup>
   <ItemGroup Condition="'$(EnableClientScripting)' == 'True'">
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.0.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="4.0.1" PrivateAssets="compile" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.0.1" PrivateAssets="compile" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.0.1" PrivateAssets="compile" />
 
     <ProjectReference Include="..\Robust.Shared.Scripting\Robust.Shared.Scripting.csproj" />
   </ItemGroup>

Robust.Client/Serialization/ClientSpriteSpecifierSerializer.cs

@@ -1,5 +1,4 @@
 using Robust.Client.ResourceManagement;
-using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Manager.Attributes;
@@ -29,7 +28,7 @@ public sealed class ClientSpriteSpecifierSerializer : SpriteSpecifierSerializer
         }
 
         var res = dependencies.Resolve<IResourceCache>();
-        var rsiPath = SpriteSpecifierSerializer.TextureRoot / valuePathNode.Value;
+        var rsiPath = TextureRoot / valuePathNode.Value;
         if (!res.TryGetResource(rsiPath, out RSIResource? resource))
         {
             return new ErrorNode(node, "Failed to load RSI");
@@ -40,6 +39,10 @@ public sealed class ClientSpriteSpecifierSerializer : SpriteSpecifierSerializer
             return new ErrorNode(node, "Invalid RSI state");
         }
 
-        return new ValidatedMappingNode(new());
+        return new ValidatedMappingNode(new()
+        {
+            { new ValidatedValueNode(new ValueDataNode("sprite")), new ValidatedValueNode(pathNode)},
+            { new ValidatedValueNode(new ValueDataNode("state")), new ValidatedValueNode(valueStateNode)},
+        });
     }
 }

Robust.Client/UserInterface/Control.Layout.cs

@@ -715,7 +715,7 @@ namespace Robust.Client.UserInterface
             maxH = MathHelper.Clamp(maxConstraint, minH, maxH);
 
             minConstraint = float.IsNaN(setH) ? 0 : setH;
-            minH = MathHelper.Clamp(maxH, minConstraint, minH);
+            minH = MathHelper.Clamp(minConstraint, minH, maxH);
 
             return new Vector2(
                 Math.Clamp(avail.X, minW, maxW),

Robust.Client/UserInterface/Controls/OutputPanel.cs

@@ -89,7 +89,7 @@ namespace Robust.Client.UserInterface.Controls
 
         public void AddMessage(FormattedMessage message)
         {
-            var entry = new RichTextEntry(message, this, _tagManager);
+            var entry = new RichTextEntry(message, this, _tagManager, null);
 
             entry.Update(_getFont(), _getContentBox().Width, UIScale);
 

Robust.Client/UserInterface/Controls/RichTextLabel.cs

@@ -1,4 +1,5 @@
-using System.Numerics;
+using System;
+using System.Numerics;
 using JetBrains.Annotations;
 using Robust.Client.Graphics;
 using Robust.Client.UserInterface.RichText;
@@ -21,18 +22,18 @@ namespace Robust.Client.UserInterface.Controls
             IoCManager.InjectDependencies(this);
         }
 
-        public void SetMessage(FormattedMessage message)
+        public void SetMessage(FormattedMessage message, Type[]? tagsAllowed = null, Color? defaultColor = null)
         {
             _message = message;
-            _entry = new RichTextEntry(_message, this, _tagManager);
+            _entry = new RichTextEntry(_message, this, _tagManager, tagsAllowed, defaultColor);
             InvalidateMeasure();
         }
 
-        public void SetMessage(string message)
+        public void SetMessage(string message, Type[]? tagsAllowed = null, Color? defaultColor = null)
         {
             var msg = new FormattedMessage();
             msg.AddText(message);
-            SetMessage(msg);
+            SetMessage(msg, tagsAllowed, defaultColor);
         }
 
         public string? GetMessage() => _message?.ToMarkup();

Robust.Client/UserInterface/Controls/SpinBox.cs

@@ -14,7 +14,7 @@ namespace Robust.Client.UserInterface.Controls
         public const string LeftButtonStyle = "spinbox-left";
         public const string RightButtonStyle = "spinbox-right";
         public const string MiddleButtonStyle = "spinbox-middle";
-        private LineEdit _lineEdit;
+        public LineEdit LineEditControl { get; }
         private List<Button> _leftButtons = new();
         private List<Button> _rightButtons = new();
         private int _stepSize = 1;
@@ -35,7 +35,7 @@ namespace Robust.Client.UserInterface.Controls
                     return;
                 }
                 _value = value;
-                _lineEdit.Text = value.ToString();
+                LineEditControl.Text = value.ToString();
                 ValueChanged?.Invoke(new ValueChangedEventArgs(value));
             }
         }
@@ -52,7 +52,7 @@ namespace Robust.Client.UserInterface.Controls
                 return;
             }
             _value = value;
-            _lineEdit.Text = value.ToString();
+            LineEditControl.Text = value.ToString();
         }
 
         public event Action<ValueChangedEventArgs>? ValueChanged;
@@ -62,17 +62,17 @@ namespace Robust.Client.UserInterface.Controls
             Orientation = LayoutOrientation.Horizontal;
             MouseFilter = MouseFilterMode.Pass;
 
-            _lineEdit = new LineEdit
+            LineEditControl = new LineEdit
             {
                 MinSize = new Vector2(40, 0),
                 HorizontalExpand = true
             };
-            AddChild(_lineEdit);
+            AddChild(LineEditControl);
 
             Value = 0;
 
-            _lineEdit.IsValid = (str) => int.TryParse(str, out var i) && (IsValid == null || IsValid(i));
-            _lineEdit.OnTextChanged += (args) =>
+            LineEditControl.IsValid = (str) => int.TryParse(str, out var i) && (IsValid == null || IsValid(i));
+            LineEditControl.OnTextChanged += (args) =>
             {
                 if (int.TryParse(args.Text, out int i))
                     Value = i;
@@ -143,8 +143,8 @@ namespace Robust.Client.UserInterface.Controls
         /// </summary>
         public bool LineEditDisabled
         {
-            get => !_lineEdit.Editable;
-            set => _lineEdit.Editable = !value;
+            get => !LineEditControl.Editable;
+            set => LineEditControl.Editable = !value;
         }
 
         /// <summary>
@@ -185,7 +185,7 @@ namespace Robust.Client.UserInterface.Controls
         {
             base.MouseWheel(args);
 
-            if (!_lineEdit.HasKeyboardFocus())
+            if (!LineEditControl.HasKeyboardFocus())
             {
                 return;
             }

Robust.Client/UserInterface/CustomControls/DebugMonitorControls/DebugCoordsPanel.cs

@@ -65,7 +65,7 @@ namespace Robust.Client.UserInterface.CustomControls.DebugMonitorControls
             EntityCoordinates mouseGridPos;
             TileRef tile;
 
-            var mouseWorldMap = _eyeManager.ScreenToMap(mouseScreenPos);
+            var mouseWorldMap = _eyeManager.PixelToMap(mouseScreenPos);
             if (mouseWorldMap == MapCoordinates.Nullspace)
                 return;
 

Robust.Client/UserInterface/CustomControls/IViewportControl.cs

@@ -24,6 +24,11 @@ namespace Robust.Client.UserInterface.CustomControls
         /// </param>
         MapCoordinates ScreenToMap(Vector2 coords);
 
+        /// <summary>
+        /// Similar to <see cref="ScreenToMap(Vector2)"/>, except it should compensate for the effects of shaders on viewports.
+        /// </summary>
+        MapCoordinates PixelToMap(Vector2 point);
+
         /// <summary>
         ///     Converts a point on the map to screen coordinates.
         /// </summary>

Robust.Client/UserInterface/CustomControls/ProjectionEvents.cs

@@ -0,0 +1,34 @@
+using Robust.Client.Graphics;
+using Robust.Shared.GameObjects;
+using System.Numerics;
+
+namespace Robust.Client.UserInterface.CustomControls;
+
+/// <summary>
+/// An event used to reverse distortion effects applied by shaders.
+/// Used to find the map position that visible pixels originate from so that severe distortion shaders do not make interaction nigh-impossible.
+/// </summary>
+[ByRefEvent]
+public record struct PixelToMapEvent(Vector2 LocalPosition, IViewportControl Control, IClydeViewport Viewport)
+{
+    /// <summary>
+    /// The local position of the pixel within the <see cref="Control"/> that we are trying to convert to a map position.
+    /// </summary>
+    public readonly Vector2 LocalPosition = LocalPosition;
+
+    /// <summary>
+    /// The original (or WIP) location of the pixel within the <see cref="Control"/> that we are trying to convert to a map position.
+    /// Used as the output of the event.
+    /// </summary>
+    public Vector2 VisiblePosition = LocalPosition;
+
+    /// <summary>
+    /// The control the pixel we are considering is located within.
+    /// </summary>
+    public readonly IViewportControl Control = Control;
+
+    /// <summary>
+    /// The viewport being displayed by the control we are considering.
+    /// </summary>
+    public readonly IClydeViewport Viewport = Viewport;
+}

Robust.Client/UserInterface/CustomControls/ViewportContainer.cs

@@ -1,6 +1,7 @@
 using System.Numerics;
 using Robust.Client.Graphics;
 using Robust.Client.Input;
+using Robust.Shared.GameObjects;
 using Robust.Shared.Maths;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
@@ -13,8 +14,9 @@ namespace Robust.Client.UserInterface.CustomControls
     [Virtual]
     public class ViewportContainer : Control, IViewportControl
     {
-        private readonly IClyde _displayManager;
-        private readonly IInputManager _inputManager;
+        [Dependency] private readonly IClyde _displayManager = default!;
+        [Dependency] private readonly IEntityManager _entityManager = default!;
+        [Dependency] private readonly IInputManager _inputManager = default!;
 
         public IClydeViewport? Viewport { get; set; }
 
@@ -36,8 +38,7 @@ namespace Robust.Client.UserInterface.CustomControls
 
         public ViewportContainer()
         {
-            _displayManager = IoCManager.Resolve<IClyde>();
-            _inputManager = IoCManager.Resolve<IInputManager>();
+            IoCManager.InjectDependencies(this);
             MouseFilter = MouseFilterMode.Stop;
             Resized();
         }
@@ -99,8 +100,7 @@ namespace Robust.Client.UserInterface.CustomControls
         // -- Handlers: In --
 
         // -- Utils / S2M-M2S Base --
-
-        public MapCoordinates LocalPixelToMap(Vector2 point)
+        public MapCoordinates LocalCoordsToMap(Vector2 point)
         {
             if (Viewport == null)
                 return default;
@@ -111,6 +111,19 @@ namespace Robust.Client.UserInterface.CustomControls
             return Viewport.LocalToWorld(point);
         }
 
+        public MapCoordinates LocalPixelToMap(Vector2 point)
+        {
+            if (Viewport == null)
+                return default;
+
+            // pre-scaler
+            point *= _viewportResolution;
+            var ev = new PixelToMapEvent(point, this, Viewport);
+            _entityManager.EventBus.RaiseEvent(EventSource.Local, ref ev);
+
+            return Viewport.LocalToWorld(ev.VisiblePosition);
+        }
+
         public Vector2 WorldToLocalPixel(Vector2 point)
         {
             if (Viewport?.Eye == null)
@@ -127,6 +140,12 @@ namespace Robust.Client.UserInterface.CustomControls
         // -- Utils / S2M-M2S Extended --
 
         public MapCoordinates ScreenToMap(Vector2 point)
+        {
+            return LocalCoordsToMap(point - GlobalPixelPosition);
+        }
+
+        /// <inheritdoc/>
+        public MapCoordinates PixelToMap(Vector2 point)
         {
             return LocalPixelToMap(point - GlobalPixelPosition);
         }

Robust.Client/UserInterface/RichText/BoldItalicTag.cs

@@ -0,0 +1,29 @@
+using Robust.Client.ResourceManagement;
+using Robust.Shared.IoC;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.UserInterface.RichText;
+
+public sealed class BoldItalicTag : IMarkupTag
+{
+    public const string BoldItalicFont = "DefaultBoldItalic";
+
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+
+    public string Name => "bolditalic";
+
+    /// <inheritdoc/>
+    public void PushDrawContext(MarkupNode node, MarkupDrawingContext context)
+    {
+        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager, BoldItalicFont);
+        context.Font.Push(font);
+    }
+
+    /// <inheritdoc/>
+    public void PopDrawContext(MarkupNode node, MarkupDrawingContext context)
+    {
+        context.Font.Pop();
+    }
+}

Robust.Client/UserInterface/RichText/BoldTag.cs

@@ -1,3 +1,4 @@
+using System.Linq;
 using Robust.Client.ResourceManagement;
 using Robust.Shared.IoC;
 using Robust.Shared.Prototypes;
@@ -14,12 +15,18 @@ public sealed class BoldTag : IMarkupTag
 
     public string Name => "bold";
 
+    /// <inheritdoc/>
     public void PushDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
-        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager, BoldFont);
+        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager,
+            context.Tags.Any(static x => x is ItalicTag)
+                ? BoldItalicTag.BoldItalicFont
+                : BoldFont
+        );
         context.Font.Push(font);
     }
 
+    /// <inheritdoc/>
     public void PopDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
         context.Font.Pop();

Robust.Client/UserInterface/RichText/BulletTag.cs

@@ -0,0 +1,11 @@
+using Robust.Shared.Utility;
+
+namespace Robust.Client.UserInterface.RichText;
+
+public sealed class BulletTag : IMarkupTag
+{
+    public string Name => "bullet";
+
+    /// <inheritdoc/>
+    public string TextBefore(MarkupNode _) => " · ";
+}

Robust.Client/UserInterface/RichText/ColorTag.cs

@@ -8,7 +8,7 @@ namespace Robust.Client.UserInterface.RichText;
 /// </summary>
 public sealed class ColorTag : IMarkupTag
 {
-    private static readonly Color DefaultColor = new(200, 200, 200);
+    public static readonly Color DefaultColor = new(200, 200, 200);
 
     public string Name => "color";
 

Robust.Client/UserInterface/RichText/FontPrototype.cs

@@ -8,8 +8,8 @@ namespace Robust.Client.UserInterface.RichText;
 public sealed class FontPrototype : IPrototype
 {
     [IdDataField]
-    public string ID { get; } = default!;
+    public string ID { get; private set; } = default!;
 
     [DataField("path", required: true)]
-    public ResPath Path { get; } = default!;
+    public ResPath Path { get; private set; } = default!;
 }

Robust.Client/UserInterface/RichText/FontTag.cs

@@ -14,12 +14,14 @@ namespace Robust.Client.UserInterface.RichText;
 public sealed class FontTag : IMarkupTag
 {
     public const string DefaultFont = "Default";
+    public const int DefaultSize = 12;
 
     [Dependency] private readonly IResourceCache _resourceCache = default!;
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
 
     public string Name => "font";
 
+    /// <inheritdoc/>
     public void PushDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
         string fontId = node.Value.StringValue ?? DefaultFont;
@@ -28,6 +30,7 @@ public sealed class FontTag : IMarkupTag
         context.Font.Push(font);
     }
 
+    /// <inheritdoc/>
     public void PopDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
         context.Font.Pop();
@@ -44,7 +47,7 @@ public sealed class FontTag : IMarkupTag
         IPrototypeManager prototypeManager,
         string fontId)
     {
-        var size = 12;
+        var size = DefaultSize;
 
         if (contextFontStack.TryPeek(out var previousFont))
         {

Robust.Client/UserInterface/RichText/HeadingTag.cs

@@ -0,0 +1,36 @@
+using System;
+using Robust.Client.ResourceManagement;
+using Robust.Shared.IoC;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.UserInterface.RichText;
+
+public sealed class HeadingTag : IMarkupTag
+{
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+
+    public string Name => "head";
+
+    /// <inheritdoc/>
+    public void PushDrawContext(MarkupNode node, MarkupDrawingContext context)
+    {
+        if (!node.Value.TryGetLong(out var levelParam))
+            return;
+
+        var level = Math.Min(Math.Max((int)levelParam, 1), 3);
+        node.Attributes["size"] = new MarkupParameter(
+            (int)Math.Ceiling(FontTag.DefaultSize * 2 / Math.Sqrt(level))
+        );
+
+        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager, BoldTag.BoldFont);
+        context.Font.Push(font);
+    }
+
+    /// <inheritdoc/>
+    public void PopDrawContext(MarkupNode node, MarkupDrawingContext context)
+    {
+        context.Font.Pop();
+    }
+}

Robust.Client/UserInterface/RichText/ItalicTag.cs

@@ -1,3 +1,4 @@
+using System.Linq;
 using Robust.Client.ResourceManagement;
 using Robust.Shared.IoC;
 using Robust.Shared.Prototypes;
@@ -11,14 +12,21 @@ public sealed class ItalicTag : IMarkupTag
 
     [Dependency] private readonly IResourceCache _resourceCache = default!;
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
+
     public string Name => "italic";
 
+    /// <inheritdoc/>
     public void PushDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
-        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager, ItalicFont);
+        var font = FontTag.CreateFont(context.Font, node, _resourceCache, _prototypeManager,
+            context.Tags.Any(static x => x is BoldTag)
+                ? BoldItalicTag.BoldItalicFont
+                : ItalicFont
+        );
         context.Font.Push(font);
     }
 
+    /// <inheritdoc/>
     public void PopDrawContext(MarkupNode node, MarkupDrawingContext context)
     {
         context.Font.Pop();

Robust.Client/UserInterface/RichText/MarkupDrawingContext.cs

@@ -8,22 +8,26 @@ public sealed class MarkupDrawingContext
 {
     public readonly Stack<Color> Color;
     public readonly Stack<Font> Font;
+    public readonly List<IMarkupTag> Tags;
 
     public MarkupDrawingContext()
     {
         Color = new Stack<Color>();
         Font = new Stack<Font>();
+        Tags = new List<IMarkupTag>();
     }
 
     public MarkupDrawingContext(int capacity)
     {
         Color = new Stack<Color>(capacity);
         Font = new Stack<Font>(capacity);
+        Tags = new List<IMarkupTag>();
     }
 
     public void Clear()
     {
         Color.Clear();
         Font.Clear();
+        Tags.Clear();
     }
 }

Robust.Client/UserInterface/RichText/MarkupTagManager.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 using Robust.Shared.IoC;
 using Robust.Shared.Reflection;
 using Robust.Shared.Sandboxing;
@@ -15,24 +16,29 @@ public sealed class MarkupTagManager
     /// <summary>
     /// Tags defined in engine need to be instantiated here because of sandboxing
     /// </summary>
-    private readonly Dictionary<string, IMarkupTag> _markupTagTypes = new()
-    {
-        {"color", new ColorTag()},
-        {"cmdlink", new CommandLinkTag()},
-        {"font", new FontTag()},
-        {"bold", new BoldTag()},
-        {"italic", new ItalicTag()}
-    };
+    private readonly Dictionary<string, IMarkupTag> _markupTagTypes = new IMarkupTag[] {
+        new BoldItalicTag(),
+        new BoldTag(),
+        new BulletTag(),
+        new ColorTag(),
+        new CommandLinkTag(),
+        new FontTag(),
+        new HeadingTag(),
+        new ItalicTag()
+    }.ToDictionary(x => x.Name.ToLower(), x => x);
 
     /// <summary>
     /// A list of <see cref="IMarkupTag"/> types that shouldn't be instantiated through reflection
     /// </summary>
     private readonly List<Type> _engineTypes = new()
     {
+        typeof(BoldItalicTag),
+        typeof(BoldTag),
+        typeof(BulletTag),
         typeof(ColorTag),
         typeof(CommandLinkTag),
         typeof(FontTag),
-        typeof(BoldTag),
+        typeof(HeadingTag),
         typeof(ItalicTag)
     };
 
@@ -59,9 +65,11 @@ public sealed class MarkupTagManager
         return _markupTagTypes.GetValueOrDefault(name);
     }
 
-    public bool TryGetMarkupTag(string name, [NotNullWhen(true)] out IMarkupTag? tag)
+    public bool TryGetMarkupTag(string name, Type[]? tagsAllowed, [NotNullWhen(true)] out IMarkupTag? tag)
     {
-        if (_markupTagTypes.TryGetValue(name, out var markupTag))
+        if (_markupTagTypes.TryGetValue(name, out var markupTag)
+            // Using a whitelist prevents new tags from sneaking in.
+            && (tagsAllowed == null || Array.IndexOf(tagsAllowed, markupTag.GetType()) != -1))
         {
             tag = markupTag;
             return true;

Robust.Client/UserInterface/RichTextEntry.cs

@@ -16,9 +16,9 @@ namespace Robust.Client.UserInterface
     /// </summary>
     internal struct RichTextEntry
     {
-        private static readonly Color DefaultColor = new(200, 200, 200);
-
+        private readonly Color _defaultColor;
         private readonly MarkupTagManager _tagManager;
+        private readonly Type[]? _tagsAllowed;
 
         public readonly FormattedMessage Message;
 
@@ -39,13 +39,15 @@ namespace Robust.Client.UserInterface
 
         private readonly Dictionary<int, Control> _tagControls = new();
 
-        public RichTextEntry(FormattedMessage message, Control parent, MarkupTagManager tagManager)
+        public RichTextEntry(FormattedMessage message, Control parent, MarkupTagManager tagManager, Type[]? tagsAllowed = null, Color? defaultColor = null)
         {
             Message = message;
             Height = 0;
             Width = 0;
             LineBreaks = default;
+            _defaultColor = defaultColor ?? new(200, 200, 200);
             _tagManager = tagManager;
+            _tagsAllowed = tagsAllowed;
 
             var nodeIndex = -1;
             foreach (var node in Message.Nodes)
@@ -55,7 +57,7 @@ namespace Robust.Client.UserInterface
                 if (node.Name == null)
                     continue;
 
-                if (!_tagManager.TryGetMarkupTag(node.Name, out var tag) || !tag.TryGetControl(node, out var control))
+                if (!_tagManager.TryGetMarkupTag(node.Name, _tagsAllowed, out var tag) || !tag.TryGetControl(node, out var control))
                     continue;
 
                 parent.Children.Add(control);
@@ -82,7 +84,7 @@ namespace Robust.Client.UserInterface
             var wordWrap = new WordWrap(maxSizeX);
             var context = new MarkupDrawingContext();
             context.Font.Push(defaultFont);
-            context.Color.Push(DefaultColor);
+            context.Color.Push(_defaultColor);
 
             // Go over every node.
             // Nodes can change the markup drawing context and return additional text.
@@ -171,7 +173,7 @@ namespace Robust.Client.UserInterface
             float uiScale)
         {
             context.Clear();
-            context.Color.Push(DefaultColor);
+            context.Color.Push(_defaultColor);
             context.Font.Push(defaultFont);
 
             var globalBreakCounter = 0;
@@ -186,7 +188,7 @@ namespace Robust.Client.UserInterface
                 var text = ProcessNode(node, context);
                 if (!context.Color.TryPeek(out var color) || !context.Font.TryPeek(out var font))
                 {
-                    color = DefaultColor;
+                    color = _defaultColor;
                     font = defaultFont;
                 }
 
@@ -226,15 +228,17 @@ namespace Robust.Client.UserInterface
                 return node.Value.StringValue ?? "";
 
             //Skip the node if there is no markup tag for it.
-            if (!_tagManager.TryGetMarkupTag(node.Name, out var tag))
+            if (!_tagManager.TryGetMarkupTag(node.Name, _tagsAllowed, out var tag))
                 return "";
 
             if (!node.Closing)
             {
+                context.Tags.Add(tag);
                 tag.PushDrawContext(node, context);
                 return tag.TextBefore(node);
             }
 
+            context.Tags.Remove(tag);
             tag.PopDrawContext(node, context);
             return tag.TextAfter(node);
         }

Robust.Client/UserInterface/Themes/UiTheme.cs

@@ -27,7 +27,7 @@ public sealed class UITheme : IPrototype
 
     [ViewVariables]
     [IdDataField]
-    public string ID { get; } = default!;
+    public string ID { get; private set; } = default!;
 
     [DataField("path")]
     private ResPath _path;
@@ -70,7 +70,7 @@ public sealed class UITheme : IPrototype
 
         if (!texturePath.EndsWith(".png"))
             texturePath = $"{texturePath}.png";
-        
+
         var resPath = new ResPath(texturePath);
         if (resPath.IsRelative)
         {

Robust.Client/UserInterface/UserInterfaceManager.Themes.cs

@@ -29,7 +29,7 @@ internal partial class UserInterfaceManager
     public void SetActiveTheme(string themeName)
     {
         if (!_themes.TryGetValue(themeName, out var theme) || (theme == CurrentTheme)) return;
-        CurrentTheme = theme;
+        UpdateTheme(theme);
     }
 
     public void SetDefaultTheme(string themeId)

Robust.Serialization.Generator/DataDefinition.cs

@@ -0,0 +1,6 @@
+using System.Collections.Generic;
+using Microsoft.CodeAnalysis;
+
+namespace Robust.Serialization.Generator;
+
+public sealed record DataDefinition(ITypeSymbol Type, string GenericTypeName, List<DataField> Fields, bool HasHooks, bool InvalidFields);

Robust.Serialization.Generator/DataDefinitionComparer.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Robust.Serialization.Generator;
+
+public sealed class DataDefinitionComparer : IEqualityComparer<TypeDeclarationSyntax>
+{
+    public bool Equals(TypeDeclarationSyntax x, TypeDeclarationSyntax y)
+    {
+        return x.Equals(y);
+    }
+
+    public int GetHashCode(TypeDeclarationSyntax type)
+    {
+        return type.GetHashCode();
+    }
+}

Robust.Serialization.Generator/DataField.cs

@@ -0,0 +1,14 @@
+using Microsoft.CodeAnalysis;
+
+namespace Robust.Serialization.Generator;
+
+public sealed record DataField(
+    ISymbol Symbol,
+    ITypeSymbol Type,
+    (INamedTypeSymbol Serializer, CustomSerializerType Type)? CustomSerializer);
+
+public enum CustomSerializerType
+{
+    Copier,
+    CopyCreator
+}

Robust.Serialization.Generator/Generator.cs

@@ -0,0 +1,564 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using static Robust.Serialization.Generator.CustomSerializerType;
+using static Robust.Serialization.Generator.Types;
+
+namespace Robust.Serialization.Generator;
+
+[Generator]
+public class Generator : IIncrementalGenerator
+{
+    private const string TypeCopierInterfaceNamespace = "Robust.Shared.Serialization.TypeSerializers.Interfaces.ITypeCopier";
+    private const string TypeCopyCreatorInterfaceNamespace = "Robust.Shared.Serialization.TypeSerializers.Interfaces.ITypeCopyCreator";
+    private const string SerializationHooksNamespace = "Robust.Shared.Serialization.ISerializationHooks";
+
+    public void Initialize(IncrementalGeneratorInitializationContext initContext)
+    {
+        IncrementalValuesProvider<TypeDeclarationSyntax> dataDefinitions = initContext.SyntaxProvider.CreateSyntaxProvider(
+            static (node, _) => node is TypeDeclarationSyntax,
+            static (context, _) =>
+            {
+                var type = (TypeDeclarationSyntax) context.Node;
+                var symbol = (ITypeSymbol) context.SemanticModel.GetDeclaredSymbol(type)!;
+                return IsDataDefinition(symbol) ? type : null;
+            }
+        ).Where(static type => type != null)!;
+
+        var comparer = new DataDefinitionComparer();
+        initContext.RegisterSourceOutput(
+            initContext.CompilationProvider.Combine(dataDefinitions.WithComparer(comparer).Collect()),
+            static (sourceContext, source) =>
+            {
+                var (compilation, declarations) = source;
+                var builder = new StringBuilder();
+                var containingTypes = new Stack<INamedTypeSymbol>();
+
+                foreach (var declaration in declarations)
+                {
+                    builder.Clear();
+                    containingTypes.Clear();
+
+                    var type = compilation.GetSemanticModel(declaration.SyntaxTree).GetDeclaredSymbol(declaration)!;
+
+                    var nonPartial = !IsPartial(declaration);
+
+                    var namespaceString = type.ContainingNamespace.IsGlobalNamespace
+                        ? string.Empty
+                        : $"namespace {type.ContainingNamespace.ToDisplayString()};";
+
+                    var containingType = type.ContainingType;
+                    while (containingType != null)
+                    {
+                        containingTypes.Push(containingType);
+                        containingType = containingType.ContainingType;
+                    }
+
+                    var containingTypesStart = new StringBuilder();
+                    var containingTypesEnd = new StringBuilder();
+                    foreach (var parent in containingTypes)
+                    {
+                        var syntax = (ClassDeclarationSyntax) parent.DeclaringSyntaxReferences[0].GetSyntax();
+                        if (!IsPartial(syntax))
+                        {
+                            nonPartial = true;
+                            continue;
+                        }
+
+                        containingTypesStart.AppendLine($"{GetPartialTypeDefinitionLine(parent)}\n{{");
+                        containingTypesEnd.AppendLine("}");
+                    }
+
+                    var definition = GetDataDefinition(type);
+                    if (nonPartial || definition.InvalidFields)
+                        continue;
+
+                    builder.AppendLine($$"""
+#nullable enable
+using System;
+using Robust.Shared.Analyzers;
+using Robust.Shared.IoC;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Serialization.Manager.Exceptions;
+using Robust.Shared.Serialization.TypeSerializers.Interfaces;
+#pragma warning disable CS0618 // Type or member is obsolete
+
+{{namespaceString}}
+
+{{containingTypesStart}}
+
+[RobustAutoGenerated]
+{{GetPartialTypeDefinitionLine(type)}} : ISerializationGenerated<{{definition.GenericTypeName}}>
+{
+    {{GetConstructor(definition)}}
+
+    {{GetCopyMethods(definition)}}
+
+    {{GetInstantiators(definition)}}
+}
+
+{{containingTypesEnd}}
+""");
+
+                    var symbolName = type
+                        .ToDisplayString()
+                        .Replace('<', '{')
+                        .Replace('>', '}');
+
+                    var sourceText = CSharpSyntaxTree
+                        .ParseText(builder.ToString())
+                        .GetRoot()
+                        .NormalizeWhitespace()
+                        .ToFullString();
+
+                    sourceContext.AddSource($"{symbolName}.g.cs", sourceText);
+                }
+            }
+        );
+    }
+
+    private static DataDefinition GetDataDefinition(ITypeSymbol definition)
+    {
+        var fields = new List<DataField>();
+        var invalidFields = false;
+
+        foreach (var member in definition.GetMembers())
+        {
+            if (member is not IFieldSymbol && member is not IPropertySymbol)
+                continue;
+
+            if (member.IsStatic)
+                continue;
+
+            if (IsDataField(member, out var type, out var attribute))
+            {
+                if (attribute.ConstructorArguments.FirstOrDefault(arg => arg.Kind == TypedConstantKind.Type).Value is INamedTypeSymbol customSerializer)
+                {
+                    if (ImplementsInterface(customSerializer, TypeCopierInterfaceNamespace))
+                    {
+                        fields.Add(new DataField(member, type, (customSerializer, Copier)));
+                        continue;
+                    }
+                    else if (ImplementsInterface(customSerializer, TypeCopyCreatorInterfaceNamespace))
+                    {
+                        fields.Add(new DataField(member, type, (customSerializer, CopyCreator)));
+                        continue;
+                    }
+                }
+
+                fields.Add(new DataField(member, type, null));
+
+                if (IsReadOnlyMember(definition, type))
+                {
+                    invalidFields = true;
+                }
+            }
+        }
+
+        var typeName = GetGenericTypeName(definition);
+        var hasHooks = ImplementsInterface(definition, SerializationHooksNamespace);
+
+        return new DataDefinition(definition, typeName, fields, hasHooks, invalidFields);
+    }
+
+     private static string GetConstructor(DataDefinition definition)
+     {
+         if (definition.Type.TypeKind == TypeKind.Interface)
+             return string.Empty;
+
+         var builder = new StringBuilder();
+
+         if (NeedsEmptyConstructor(definition.Type))
+         {
+             builder.AppendLine($$"""
+                                  // Implicit constructor
+                                  #pragma warning disable CS8618
+                                  public {{definition.Type.Name}}()
+                                  #pragma warning enable CS8618
+                                  {
+                                  }
+                                  """);
+         }
+
+         return builder.ToString();
+     }
+
+    private static string GetCopyMethods(DataDefinition definition)
+    {
+        var builder = new StringBuilder();
+
+        var modifiers = IsVirtualClass(definition.Type) ? "virtual " : string.Empty;
+        var baseCall = string.Empty;
+        string baseCopy;
+        var baseType = definition.Type.BaseType;
+
+        if (baseType != null && IsDataDefinition(definition.Type.BaseType))
+        {
+            var baseName = baseType.ToDisplayString();
+            baseCall = $"""
+                        var definitionCast = ({baseName}) target;
+                        base.InternalCopy(ref definitionCast, serialization, hookCtx, context);
+                        target = ({definition.GenericTypeName}) definitionCast;
+                        """;
+
+             baseCopy = $$"""
+                          public override void Copy(ref {{baseName}} target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                          {
+                              var cast = ({{definition.GenericTypeName}}) target;
+                              Copy(ref cast, serialization, hookCtx, context);
+                              target = cast!;
+                          }
+
+                          public override void Copy(ref object target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                          {
+                              var cast = ({{definition.GenericTypeName}}) target;
+                              Copy(ref cast, serialization, hookCtx, context);
+                              target = cast!;
+                          }
+                          """;
+        }
+        else
+        {
+            baseCopy = $$"""
+                         public {{modifiers}} void Copy(ref object target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                         {
+                             var cast = ({{definition.GenericTypeName}}) target;
+                             Copy(ref cast, serialization, hookCtx, context);
+                             target = cast!;
+                         }
+                         """;
+        }
+
+        builder.AppendLine($$"""
+                             public {{modifiers}} void InternalCopy(ref {{definition.GenericTypeName}} target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                             {
+                                {{baseCall}}
+                                {{CopyDataFields(definition)}}
+                             }
+
+                             public {{modifiers}} void Copy(ref {{definition.GenericTypeName}} target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                             {
+                                 InternalCopy(ref target, serialization, hookCtx, context);
+                             }
+
+                             {{baseCopy}}
+                             """);
+
+        foreach (var @interface in GetImplicitDataDefinitionInterfaces(definition.Type, true))
+        {
+            var interfaceModifiers = baseType != null && baseType.AllInterfaces.Contains(@interface, SymbolEqualityComparer.Default)
+                ? "override "
+                : modifiers;
+            var interfaceName = @interface.ToDisplayString();
+
+            builder.AppendLine($$"""
+                                 public {{interfaceModifiers}} void InternalCopy(ref {{interfaceName}} target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                                 {
+                                     var def = ({{definition.GenericTypeName}}) target;
+                                     Copy(ref def, serialization, hookCtx, context);
+                                     target = def;
+                                 }
+
+                                 public {{interfaceModifiers}} void Copy(ref {{interfaceName}} target, ISerializationManager serialization, SerializationHookContext hookCtx, ISerializationContext? context = null)
+                                 {
+                                     InternalCopy(ref target, serialization, hookCtx, context);
+                                 }
+                                 """);
+        }
+
+        return builder.ToString();
+    }
+
+    private static string GetInstantiators(DataDefinition definition)
+    {
+        var builder = new StringBuilder();
+        var modifiers = string.Empty;
+
+        if (definition.Type.BaseType is { } baseType && IsDataDefinition(baseType))
+            modifiers = "override ";
+        else if (IsVirtualClass(definition.Type))
+            modifiers = "virtual ";
+
+        if (definition.Type.IsAbstract)
+        {
+            // TODO make abstract once data definitions are forced to be partial
+            builder.AppendLine($$"""
+                                 public {{modifiers}} {{definition.GenericTypeName}} Instantiate()
+                                 {
+                                     throw new NotImplementedException();
+                                 }
+                                 """);
+        }
+        else
+        {
+            builder.AppendLine($$"""
+                                 public {{modifiers}} {{definition.GenericTypeName}} Instantiate()
+                                 {
+                                     return new {{definition.GenericTypeName}}();
+                                 }
+                                 """);
+        }
+
+        foreach (var @interface in GetImplicitDataDefinitionInterfaces(definition.Type, false))
+        {
+            var interfaceName = @interface.ToDisplayString();
+            builder.AppendLine($$"""
+                                 {{interfaceName}} {{interfaceName}}.Instantiate()
+                                 {
+                                     return Instantiate();
+                                 }
+
+                                 {{interfaceName}} ISerializationGenerated<{{interfaceName}}>.Instantiate()
+                                 {
+                                     return Instantiate();
+                                 }
+                                 """);
+        }
+
+        return builder.ToString();
+    }
+
+    // TODO serveronly? do we care? who knows!!
+    private static StringBuilder CopyDataFields(DataDefinition definition)
+    {
+        var builder = new StringBuilder();
+
+        builder.AppendLine($"""
+if (serialization.TryCustomCopy(this, ref target, hookCtx, {definition.HasHooks.ToString().ToLower()}, context))
+    return;
+""");
+
+        var structCopier = new StringBuilder();
+        foreach (var field in definition.Fields)
+        {
+            var type = field.Type;
+            var typeName = type.ToDisplayString();
+            if (IsMultidimensionalArray(type))
+            {
+                typeName = typeName.Replace("*", "");
+            }
+
+            var isNullableValueType = IsNullableValueType(type);
+            var nonNullableTypeName = type.WithNullableAnnotation(NullableAnnotation.None).ToDisplayString();
+            if (isNullableValueType)
+            {
+                nonNullableTypeName = typeName.Substring(0, typeName.Length - 1);
+            }
+
+            var isClass = type.IsReferenceType || type.SpecialType == SpecialType.System_String;
+            var isNullable = type.NullableAnnotation == NullableAnnotation.Annotated;
+            var nullableOverride = isClass && !isNullable ? ", true" : string.Empty;
+            var name = field.Symbol.Name;
+            var tempVarName = $"{name}Temp";
+            var nullableValue = isNullableValueType ? ".Value" : string.Empty;
+            var nullNotAllowed = isClass && !isNullable;
+
+            if (field.CustomSerializer is { Serializer: var serializer, Type: var serializerType })
+            {
+                if (nullNotAllowed)
+                {
+                    builder.AppendLine($$"""
+                                         if ({{name}} == null)
+                                         {
+                                             throw new NullNotAllowedException();
+                                         }
+                                         """);
+                }
+
+                builder.AppendLine($$"""
+                                     {{typeName}} {{tempVarName}} = default!;
+                                     """);
+
+                if (isNullable || isNullableValueType)
+                {
+                    builder.AppendLine($$"""
+                                         if ({{name}} == null)
+                                         {
+                                             {{tempVarName}} = null!;
+                                         }
+                                         else
+                                         {
+                                         """);
+                }
+
+                var serializerName = serializer.ToDisplayString();
+                switch (serializerType)
+                {
+                    case Copier:
+                        CopyToCustom(
+                            builder,
+                            nonNullableTypeName,
+                            serializerName,
+                            tempVarName,
+                            name,
+                            isNullable,
+                            isClass,
+                            isNullableValueType
+                        );
+                        break;
+                    case CopyCreator:
+                        CreateCopyCustom(
+                            builder,
+                            name,
+                            tempVarName,
+                            nonNullableTypeName,
+                            serializerName,
+                            nullableValue,
+                            nullableOverride
+                        );
+                        break;
+                }
+
+                if (isNullable || isNullableValueType)
+                {
+                    builder.AppendLine("}");
+                }
+
+                if (definition.Type.IsValueType)
+                {
+                    structCopier.AppendLine($"{name} = {tempVarName}!,");
+                }
+                else
+                {
+                    builder.AppendLine($"target.{name} = {tempVarName}!;");
+                }
+            }
+            else
+            {
+                builder.AppendLine($$"""
+                                     {{typeName}} {{tempVarName}} = default!;
+                                     """);
+
+                if (nullNotAllowed)
+                {
+                    builder.AppendLine($$"""
+                                         if ({{name}} == null)
+                                         {
+                                             throw new NullNotAllowedException();
+                                         }
+                                         """);
+                }
+
+                var instantiator = string.Empty;
+                if (IsDataDefinition(type))
+                {
+                    instantiator = $"{tempVarName} = {name}.Instantiate();";
+                }
+                else if (!type.IsAbstract &&
+                         HasEmptyPublicConstructor(type) &&
+                         (type.IsReferenceType || IsNullableType(type)))
+                {
+                    instantiator = $"{tempVarName} = new();";
+                }
+
+                var hasHooks = ImplementsInterface(type, SerializationHooksNamespace) || !type.IsSealed;
+                builder.AppendLine($$"""
+                                     if (!serialization.TryCustomCopy(this.{{name}}, ref {{tempVarName}}, hookCtx, {{hasHooks.ToString().ToLower()}}, context))
+                                     {
+                                     """);
+
+                if (CanBeCopiedByValue(field.Symbol, field.Type))
+                {
+                    builder.AppendLine($"{tempVarName} = {name};");
+                }
+                else if (IsDataDefinition(type) && !type.IsAbstract &&
+                         type is not INamedTypeSymbol { TypeKind: TypeKind.Interface })
+                {
+                    var nullability = type.IsValueType ? string.Empty : "?";
+                    var nullable = !type.IsValueType || IsNullableType(type);
+
+                    if (nullable)
+                    {
+                        builder.AppendLine($$"""
+                                           if ({{name}} == null)
+                                           {
+                                               {{tempVarName}} = null!;
+                                           }
+                                           else
+                                           {
+                                           """);
+                    }
+
+                    builder.AppendLine($$"""
+                                         {{instantiator}}
+                                         {{name}}{{nullability}}.Copy(ref {{tempVarName}}, serialization, hookCtx, context);
+                                         """);
+
+                    if (nullable)
+                    {
+                        builder.AppendLine("}");
+                    }
+                }
+                else
+                {
+                    builder.AppendLine($"{tempVarName} = serialization.CreateCopy({name}, hookCtx, context);");
+                }
+
+                builder.AppendLine("}");
+
+                if (definition.Type.IsValueType)
+                {
+                    structCopier.AppendLine($"{name} = {tempVarName}!,");
+                }
+                else
+                {
+                    builder.AppendLine($"target.{name} = {tempVarName}!;");
+                }
+            }
+        }
+
+        if (definition.Type.IsValueType)
+        {
+            builder.AppendLine($$"""
+                                target = target with
+                                {
+                                    {{structCopier}}
+                                };
+                                """);
+        }
+
+        return builder;
+    }
+
+    private static void CopyToCustom(
+        StringBuilder builder,
+        string typeName,
+        string serializerName,
+        string tempVarName,
+        string varName,
+        bool isNullable,
+        bool isClass,
+        bool isNullableValueType)
+    {
+        var newTemp = isNullable && isClass ? $"{tempVarName} ??= new();" : string.Empty;
+        var nullableOverride = isClass ? ", true" : string.Empty;
+        var nullableValue = isNullableValueType ? ".Value" : string.Empty;
+        var nonNullableTypeName = typeName.EndsWith("?") ? typeName.Substring(0, typeName.Length - 1) : typeName;
+
+        builder.AppendLine($$"""
+                             {{nonNullableTypeName}} {{tempVarName}}CopyTo = default!;
+                             {{newTemp}}
+                             serialization.CopyTo<{{typeName}}, {{serializerName}}>(this.{{varName}}{{nullableValue}}, ref {{tempVarName}}CopyTo, hookCtx, context{{nullableOverride}});
+                             {{tempVarName}} = {{tempVarName}}CopyTo;
+                             """);
+    }
+
+    private static void CreateCopyCustom(
+        StringBuilder builder,
+        string varName,
+        string tempVarName,
+        string nonNullableTypeName,
+        string serializerName,
+        string nullableValue,
+        string nullableOverride)
+    {
+        builder.AppendLine($$"""
+                             {{tempVarName}} = serialization.CreateCopy<{{nonNullableTypeName}}, {{serializerName}}>(this.{{varName}}{{nullableValue}}, hookCtx, context{{nullableOverride}});
+                             """);
+    }
+}

Robust.Serialization.Generator/IsExternalInit.cs

@@ -0,0 +1,8 @@
+// ReSharper disable once CheckNamespace
+namespace System.Runtime.CompilerServices;
+
+// Need this to be able to define records in the project
+internal static class IsExternalInit
+{
+
+}

Robust.Serialization.Generator/Robust.Serialization.Generator.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>11</LangVersion>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Common" Version="4.4.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="4.0.1" />
+  </ItemGroup>
+
+</Project>

Robust.Serialization.Generator/Types.cs

@@ -0,0 +1,331 @@
+using System.Collections.Generic;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace Robust.Serialization.Generator;
+
+internal static class Types
+{
+    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 const string CopyByRefNamespace = "Robust.Shared.Serialization.Manager.Attributes.CopyByRefAttribute";
+
+    internal static bool IsPartial(TypeDeclarationSyntax type)
+    {
+        return type.Modifiers.IndexOf(SyntaxKind.PartialKeyword) != -1;
+    }
+
+    internal static bool IsDataDefinition(ITypeSymbol? type)
+    {
+        if (type == null)
+            return false;
+
+        return HasAttribute(type, DataDefinitionNamespace) ||
+               IsImplicitDataDefinition(type);
+    }
+
+    internal 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;
+    }
+
+    internal 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;
+    }
+
+    internal 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;
+    }
+
+    internal static IEnumerable<ITypeSymbol> GetImplicitDataDefinitionInterfaces(ITypeSymbol type, bool all)
+    {
+        var interfaces = all ? type.AllInterfaces : type.Interfaces;
+        foreach (var @interface in interfaces)
+        {
+            if (IsImplicitDataDefinitionInterface(@interface))
+                yield return @interface;
+        }
+    }
+
+    internal static bool IsNullableType(ITypeSymbol type)
+    {
+        if (type.NullableAnnotation == NullableAnnotation.Annotated)
+            return true;
+
+        if (type.OriginalDefinition.ToDisplayString() == "System.Nullable<T>")
+            return true;
+
+        return false;
+    }
+
+    internal static bool IsNullableValueType(ITypeSymbol type)
+    {
+        return type.IsValueType && IsNullableType(type);
+    }
+
+    internal static bool IsMultidimensionalArray(ITypeSymbol type)
+    {
+        return type is IArrayTypeSymbol { Rank: > 1 };
+    }
+
+    internal static bool CanBeCopiedByValue(ISymbol member, ITypeSymbol type)
+    {
+        if (type.OriginalDefinition.ToDisplayString() == "System.Nullable<T>")
+            return CanBeCopiedByValue(member, ((INamedTypeSymbol) type).TypeArguments[0]);
+
+        if (type.TypeKind == TypeKind.Enum)
+            return true;
+
+        switch (type.SpecialType)
+        {
+            case SpecialType.System_Enum:
+            case SpecialType.System_Boolean:
+            case SpecialType.System_Char:
+            case SpecialType.System_SByte:
+            case SpecialType.System_Byte:
+            case SpecialType.System_Int16:
+            case SpecialType.System_UInt16:
+            case SpecialType.System_Int32:
+            case SpecialType.System_UInt32:
+            case SpecialType.System_Int64:
+            case SpecialType.System_UInt64:
+            case SpecialType.System_Decimal:
+            case SpecialType.System_Single:
+            case SpecialType.System_Double:
+            case SpecialType.System_String:
+            case SpecialType.System_DateTime:
+                return true;
+        }
+
+        if (HasAttribute(member, CopyByRefNamespace))
+            return true;
+
+        return false;
+    }
+
+    internal static string GetGenericTypeName(ITypeSymbol symbol)
+    {
+        var name = symbol.Name;
+
+        if (symbol is INamedTypeSymbol { TypeParameters: { Length: > 0 } parameters })
+        {
+            name += "<";
+
+            for (var i = 0; i < parameters.Length; i++)
+            {
+                var parameter = parameters[i];
+                name += parameter.Name;
+
+                if (i < parameters.Length - 1)
+                {
+                    name += ", ";
+                }
+            }
+
+            name += ">";
+        }
+
+        return name;
+    }
+
+    internal static string GetPartialTypeDefinitionLine(ITypeSymbol symbol)
+    {
+        var access = symbol.DeclaredAccessibility switch
+        {
+            Accessibility.Private => "private",
+            Accessibility.ProtectedAndInternal => "protected internal",
+            Accessibility.Protected => "protected",
+            Accessibility.Internal => "internal",
+            Accessibility.Public => "public",
+            _ => "public"
+        };
+
+        var typeKeyword = "partial ";
+        if (symbol.TypeKind == TypeKind.Interface)
+        {
+            typeKeyword += "interface";
+        }
+        else
+        {
+            if (symbol.IsRecord)
+            {
+                typeKeyword += symbol.IsValueType ? "record struct" : "record";
+            }
+            else
+            {
+                typeKeyword += symbol.IsValueType ? "struct" : "class";
+            }
+
+            if (symbol.IsAbstract)
+            {
+                typeKeyword = $"abstract {typeKeyword}";
+            }
+        }
+
+        var typeName = GetGenericTypeName(symbol);
+        return $"{access} {typeKeyword} {typeName}";
+    }
+
+    internal static bool Inherits(ITypeSymbol type, string parent)
+    {
+        foreach (var baseType in GetBaseTypes(type))
+        {
+            if (baseType.ToDisplayString() == parent)
+                return true;
+        }
+
+        return false;
+    }
+
+    internal static bool ImplementsInterface(ITypeSymbol type, string interfaceName)
+    {
+        foreach (var interfaceType in type.AllInterfaces)
+        {
+            if (interfaceType.ToDisplayString().Contains(interfaceName))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    internal 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;
+    }
+
+    internal static bool NeedsEmptyConstructor(ITypeSymbol type)
+    {
+        if (type is not INamedTypeSymbol named)
+            return false;
+
+        if (named.InstanceConstructors.Length == 0)
+            return true;
+
+        foreach (var constructor in named.InstanceConstructors)
+        {
+            if (constructor.Parameters.Length == 0 &&
+                !constructor.IsImplicitlyDeclared)
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    internal static bool HasEmptyPublicConstructor(ITypeSymbol type)
+    {
+        if (type is not INamedTypeSymbol named)
+            return false;
+
+        foreach (var constructor in named.InstanceConstructors)
+        {
+            if (constructor.DeclaredAccessibility == Accessibility.Public &&
+                constructor.Parameters.Length == 0)
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    internal static bool IsVirtualClass(ITypeSymbol type)
+    {
+        return type.IsReferenceType && !type.IsSealed && type.TypeKind != TypeKind.Interface;
+    }
+
+    internal static bool HasAttribute(ISymbol symbol, string attributeName)
+    {
+        foreach (var attribute in symbol.GetAttributes())
+        {
+            if (attribute.AttributeClass?.ToDisplayString() == attributeName)
+                return true;
+        }
+
+        return false;
+    }
+
+    internal static IEnumerable<ITypeSymbol> GetBaseTypes(ITypeSymbol type)
+    {
+        var baseType = type.BaseType;
+        while (baseType != null)
+        {
+            yield return baseType;
+            baseType = baseType.BaseType;
+        }
+    }
+}

Robust.Server/GameObjects/Components/Actor/ActorComponent.cs

@@ -5,7 +5,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Server.GameObjects
 {
     [RegisterComponent]
-    public sealed class ActorComponent : Component
+    public sealed partial class ActorComponent : Component
     {
         [ViewVariables]
         public IPlayerSession PlayerSession { get; internal set; } = default!;

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

@@ -11,7 +11,7 @@ using Robust.Shared.ViewVariables;
 namespace Robust.Server.GameObjects
 {
     [RegisterComponent, ComponentReference(typeof(SharedEyeComponent))]
-    public sealed class EyeComponent : SharedEyeComponent
+    public sealed partial class EyeComponent : SharedEyeComponent
     {
         public const int DefaultVisibilityMask = 1;
 

Robust.Server/GameObjects/Components/Eye/ViewSubscriberComponent.cs

@@ -5,7 +5,7 @@ using Robust.Shared.GameObjects;
 namespace Robust.Server.GameObjects
 {
     [RegisterComponent]
-    internal sealed class ViewSubscriberComponent : Component
+    internal sealed partial class ViewSubscriberComponent : Component
     {
         internal readonly HashSet<IPlayerSession> SubscribedSessions = new();
     }

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

@@ -4,5 +4,5 @@ namespace Robust.Server.GameObjects
 {
     [RegisterComponent]
     [ComponentReference(typeof(SharedPointLightComponent))]
-    public sealed class PointLightComponent : SharedPointLightComponent {}
+    public sealed partial class PointLightComponent : SharedPointLightComponent {}
 }

Robust.Server/GameObjects/Components/UserInterface/IgnoreUIRangeComponent.cs

@@ -0,0 +1,12 @@
+using Robust.Shared.GameObjects;
+
+namespace Robust.Server.GameObjects;
+
+/// <summary>
+///     Lets any entities with this component ignore user interface range checks that would normally
+///     close the UI automatically.
+/// </summary>
+[RegisterComponent]
+public sealed partial class IgnoreUIRangeComponent : Component
+{
+}

Robust.Server/GameObjects/Components/UserInterface/ServerUserInterfaceComponent.cs

@@ -15,14 +15,14 @@ namespace Robust.Server.GameObjects
     /// <seealso cref="BoundUserInterface"/>
     [PublicAPI]
     [RegisterComponent, ComponentReference(typeof(SharedUserInterfaceComponent))]
-    public sealed class ServerUserInterfaceComponent : SharedUserInterfaceComponent
+    public sealed partial class ServerUserInterfaceComponent : SharedUserInterfaceComponent
     {
         [ViewVariables]
         public readonly Dictionary<Enum, BoundUserInterface> Interfaces = new();
     }
 
     [RegisterComponent]
-    public sealed class ActiveUserInterfaceComponent : Component
+    public sealed partial class ActiveUserInterfaceComponent : Component
     {
         public HashSet<BoundUserInterface> Interfaces = new();
     }

Robust.Server/GameObjects/Components/VisibilityComponent.cs

@@ -8,7 +8,7 @@ namespace Robust.Server.GameObjects
 {
     [RegisterComponent]
     [Access(typeof(VisibilitySystem))]
-    public sealed class VisibilityComponent : Component
+    public sealed partial class VisibilityComponent : Component
     {
         /// <summary>
         ///     The visibility layer for the entity.

Robust.Server/GameObjects/EntitySystems/ActorSystem.cs

@@ -1,6 +1,9 @@
+using System.Diagnostics.CodeAnalysis;
 using JetBrains.Annotations;
 using Robust.Server.Player;
 using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Network;
 using Robust.Shared.Utility;
 
 namespace Robust.Server.GameObjects
@@ -11,6 +14,8 @@ namespace Robust.Server.GameObjects
     [UsedImplicitly]
     public sealed class ActorSystem : EntitySystem
     {
+        [Dependency] private readonly IPlayerManager _playerManager = default!;
+
         public override void Initialize()
         {
             base.Initialize();
@@ -116,6 +121,20 @@ namespace Robust.Server.GameObjects
             // The player is fully detached now that the component has shut down.
             RaiseLocalEvent(entity, new PlayerDetachedEvent(entity, component.PlayerSession), true);
         }
+
+        public bool TryGetActorFromUserId(NetUserId? userId, [NotNullWhen(true)] out IPlayerSession? actor, [MaybeNullWhen(true)] out EntityUid? actorEntity)
+        {
+            actor = null;
+            actorEntity = null;
+            if (userId != null)
+            {
+                if (!_playerManager.TryGetSessionById(userId.Value, out actor))
+                    return false;
+                actorEntity = actor.AttachedEntity;
+            }
+
+            return actor != null;
+        }
     }
 
     /// <summary>

Robust.Server/GameObjects/EntitySystems/UserInterfaceSystem.cs

@@ -17,6 +17,8 @@ namespace Robust.Server.GameObjects
         [Dependency] private readonly IPlayerManager _playerMan = default!;
         [Dependency] private readonly TransformSystem _xformSys = default!;
 
+        private EntityQuery<IgnoreUIRangeComponent> _ignoreUIRangeQuery;
+
         private readonly List<IPlayerSession> _sessionCache = new();
 
         private readonly Dictionary<IPlayerSession, List<BoundUserInterface>> _openInterfaces = new();
@@ -30,6 +32,8 @@ namespace Robust.Server.GameObjects
             SubscribeLocalEvent<ServerUserInterfaceComponent, ComponentInit>(OnUserInterfaceInit);
             SubscribeLocalEvent<ServerUserInterfaceComponent, ComponentShutdown>(OnUserInterfaceShutdown);
             _playerMan.PlayerStatusChanged += OnPlayerStatusChanged;
+
+            _ignoreUIRangeQuery = GetEntityQuery<IgnoreUIRangeComponent>();
         }
 
         public override void Shutdown()
@@ -174,6 +178,9 @@ namespace Robust.Server.GameObjects
                 if (!query.TryGetComponent(session.AttachedEntity, out var xform))
                     continue;
 
+                if (_ignoreUIRangeQuery.HasComponent(session.AttachedEntity))
+                    continue;
+
                 if (uiMap != xform.MapID)
                 {
                     CloseUi(ui, session, activeUis);

Robust.Server/GameObjects/MapSaveIdComponent.cs

@@ -10,7 +10,7 @@ namespace Robust.Server.GameObjects
     ///     This can then be used to re-serialize the entity with the same UID for the merge driver to recognize.
     /// </remarks>
     [RegisterComponent]
-    public sealed class MapSaveIdComponent : Component
+    public sealed partial class MapSaveIdComponent : Component
     {
         public int Uid { get; set; }
     }

Robust.Server/GameObjects/ServerEntityManager.cs

@@ -81,30 +81,35 @@ namespace Robust.Server.GameObjects
 
         private protected override EntityUid CreateEntity(string? prototypeName, EntityUid uid = default, IEntityLoadContext? context = null)
         {
-            var entity = base.CreateEntity(prototypeName, uid, context);
+            if (prototypeName == null)
+                return base.CreateEntity(prototypeName, uid, context);
 
-            if (!string.IsNullOrWhiteSpace(prototypeName))
-            {
-                var prototype = PrototypeManager.Index<EntityPrototype>(prototypeName);
+            if (!PrototypeManager.TryIndex<EntityPrototype>(prototypeName, out var prototype))
+                throw new EntityCreationException($"Attempted to spawn an entity with an invalid prototype: {prototypeName}");
 
-                // At this point in time, all data configure on the entity *should* be purely from the prototype.
-                // As such, we can reset the modified ticks to Zero,
-                // which indicates "not different from client's own deserialization".
-                // So the initial data for the component or even the creation doesn't have to be sent over the wire.
-                foreach (var (netId, component) in GetNetComponents(entity))
-                {
-                    // Make sure to ONLY get components that are defined in the prototype.
-                    // Others could be instantiated directly by AddComponent (e.g. ContainerManager).
-                    // And those aren't guaranteed to exist on the client, so don't clear them.
-                    var compName = ComponentFactory.GetComponentName(component.GetType());
-                    if (prototype.Components.ContainsKey(compName))
-                        component.ClearTicks();
-                }
-            }
+            var entity = base.CreateEntity(prototype, uid, context);
 
+            // At this point in time, all data configure on the entity *should* be purely from the prototype.
+            // As such, we can reset the modified ticks to Zero,
+            // which indicates "not different from client's own deserialization".
+            // So the initial data for the component or even the creation doesn't have to be sent over the wire.
+            ClearTicks(entity, prototype);
             return entity;
         }
 
+        private void ClearTicks(EntityUid entity, EntityPrototype prototype)
+        {
+            foreach (var (netId, component) in GetNetComponents(entity))
+            {
+                // Make sure to ONLY get components that are defined in the prototype.
+                // Others could be instantiated directly by AddComponent (e.g. ContainerManager).
+                // And those aren't guaranteed to exist on the client, so don't clear them.
+                var compName = ComponentFactory.GetComponentName(netId);
+                if (prototype.Components.ContainsKey(compName))
+                    component.ClearTicks();
+            }
+        }
+
         public override EntityStringRepresentation ToPrettyString(EntityUid uid)
         {
             TryGetComponent(uid, out ActorComponent? actor);

Robust.Server/GameStates/PvsCollection.cs

@@ -77,11 +77,21 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// </summary>
     private readonly HashSet<TIndex> _globalOverrides = new();
 
+    /// <summary>
+    /// List of <see cref="TIndex"/> that should always get sent along with all of their children.
+    /// </summary>
+    private readonly HashSet<TIndex> _globalRecursiveOverrides = new();
+
     /// <summary>
     /// List of <see cref="TIndex"/> that should always get sent.
     /// </summary>
     public HashSet<TIndex>.Enumerator GlobalOverridesEnumerator => _globalOverrides.GetEnumerator();
 
+    /// <summary>
+    /// List of <see cref="TIndex"/> that should always get sent along with all of their children.
+    /// </summary>
+    public HashSet<TIndex>.Enumerator GlobalRecursiveOverridesEnumerator => _globalRecursiveOverrides.GetEnumerator();
+
     /// <summary>
     /// List of <see cref="TIndex"/> that should always get sent to a certain <see cref="ICommonSession"/>.
     /// </summary>
@@ -203,8 +213,11 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     {
         switch (location)
         {
-            case GlobalOverride _:
-                _globalOverrides.Add(index);
+            case GlobalOverride global:
+                if (global.Recursive)
+                    _globalRecursiveOverrides.Add(index);
+                else
+                    _globalOverrides.Add(index);
                 break;
             case GridChunkLocation gridChunkLocation:
                 // might be gone due to grid-deletions
@@ -239,8 +252,11 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
         // since we can find the index, we can assume the dicts will be there too & dont need to do any checks. gaming.
         switch (location)
         {
-            case GlobalOverride _:
-                _globalOverrides.Remove(index);
+            case GlobalOverride global:
+                if (global.Recursive)
+                    _globalRecursiveOverrides.Remove(index);
+                else
+                    _globalOverrides.Remove(index);
                 break;
             case GridChunkLocation gridChunkLocation:
                 _gridChunkContents[gridChunkLocation.GridId][gridChunkLocation.ChunkIndices].Remove(index);
@@ -376,15 +392,10 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
 
     #region UpdateIndex
 
-    private bool IsOverride(TIndex index)
+    private bool TryGetLocation(TIndex index, out IIndexLocation? location)
     {
-        if (_locationChangeBuffer.TryGetValue(index, out var change) &&
-            change is GlobalOverride or LocalOverride) return true;
-
-        if (_indexLocations.TryGetValue(index, out var indexLoc) &&
-            indexLoc is GlobalOverride or LocalOverride) return true;
-
-        return false;
+        return _locationChangeBuffer.TryGetValue(index, out location)
+               || _indexLocations.TryGetValue(index, out location);
     }
 
     /// <summary>
@@ -392,15 +403,25 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// </summary>
     /// <param name="index">The <see cref="TIndex"/> to update.</param>
     /// <param name="removeFromOverride">An index at an override position will not be updated unless you set this flag.</param>
-    public void UpdateIndex(TIndex index, bool removeFromOverride = false)
+    /// <param name="recursive">If true, this will also recursively send any children of the given index.</param>
+    public void AddGlobalOverride(TIndex index, bool removeFromOverride, bool recursive)
     {
-        if(!removeFromOverride && IsOverride(index))
+        if (!TryGetLocation(index, out var oldLocation))
+        {
+            RegisterUpdate(index, new GlobalOverride(recursive));
+            return;
+        }
+
+        if (!removeFromOverride && oldLocation is LocalOverride)
             return;
 
-        if (_indexLocations.TryGetValue(index, out var oldLocation) &&
-            oldLocation is GlobalOverride) return;
+        if (oldLocation is GlobalOverride global &&
+            (!removeFromOverride || global.Recursive == recursive))
+        {
+            return;
+        }
 
-        RegisterUpdate(index, new GlobalOverride());
+        RegisterUpdate(index, new GlobalOverride(recursive));
     }
 
     /// <summary>
@@ -411,12 +432,20 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// <param name="removeFromOverride">An index at an override position will not be updated unless you set this flag.</param>
     public void UpdateIndex(TIndex index, ICommonSession session, bool removeFromOverride = false)
     {
-        if(!removeFromOverride && IsOverride(index))
+        if (!TryGetLocation(index, out var oldLocation))
+        {
+            RegisterUpdate(index, new LocalOverride(session));
+            return;
+        }
+
+        if (!removeFromOverride || oldLocation is GlobalOverride)
             return;
 
-        if (_indexLocations.TryGetValue(index, out var oldLocation) &&
-            oldLocation is LocalOverride local &&
-            local.Session == session) return;
+        if (oldLocation is LocalOverride local &&
+            (!removeFromOverride || local.Session == session))
+        {
+            return;
+        }
 
         RegisterUpdate(index, new LocalOverride(session));
     }
@@ -429,34 +458,42 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// <param name="removeFromOverride">An index at an override position will not be updated unless you set this flag.</param>
     public void UpdateIndex(TIndex index, EntityCoordinates coordinates, bool removeFromOverride = false)
     {
-        if(!removeFromOverride && IsOverride(index))
+        if (!removeFromOverride
+            && TryGetLocation(index, out var oldLocation)
+            && oldLocation is GlobalOverride or LocalOverride)
+        {
+            return;
+        }
+
+        if (!_entityManager.TryGetComponent(coordinates.EntityId, out TransformComponent? xform))
             return;
 
-        var gridIdOpt = coordinates.GetGridUid(_entityManager);
-        if (gridIdOpt is EntityUid gridId && gridId.IsValid())
+        if (xform.GridUid is { } gridId && gridId.IsValid())
         {
             var gridIndices = GetChunkIndices(coordinates.Position);
             UpdateIndex(index, gridId, gridIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
             return;
         }
 
-        var mapCoordinates = coordinates.ToMap(_entityManager, _transformSystem);
-        var mapIndices = GetChunkIndices(coordinates.Position);
-        UpdateIndex(index, mapCoordinates.MapId, mapIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
+        var worldPos = _transformSystem.GetWorldMatrix(xform).Transform(coordinates.Position);
+        var mapIndices = GetChunkIndices(worldPos);
+        UpdateIndex(index, xform.MapID, mapIndices, true); //skip overridecheck bc we already did it (saves some dict lookups)
     }
 
     public IChunkIndexLocation GetChunkIndex(EntityCoordinates coordinates)
     {
-        var gridIdOpt = coordinates.GetGridUid(_entityManager);
-        if (gridIdOpt is EntityUid gridId && gridId.IsValid())
+        if (!_entityManager.TryGetComponent(coordinates.EntityId, out TransformComponent? xform))
+            return new MapChunkLocation(default, default);
+
+        if (xform.GridUid is { } gridId && gridId.IsValid())
         {
             var gridIndices = GetChunkIndices(coordinates.Position);
             return new GridChunkLocation(gridId, gridIndices);
         }
 
-        var mapCoordinates = coordinates.ToMap(_entityManager, _transformSystem);
-        var mapIndices = GetChunkIndices(coordinates.Position);
-        return new MapChunkLocation(mapCoordinates.MapId, mapIndices);
+        var worldPos = _transformSystem.GetWorldMatrix(xform).Transform(coordinates.Position);
+        var mapIndices = GetChunkIndices(worldPos);
+        return new MapChunkLocation(xform.MapID, mapIndices);
     }
 
     /// <summary>
@@ -469,11 +506,14 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// <param name="forceDirty">If true, this will mark the previous chunk as dirty even if the entity did not move from that chunk.</param>
     public void UpdateIndex(TIndex index, EntityUid gridId, Vector2i chunkIndices, bool removeFromOverride = false, bool forceDirty = false)
     {
-        if(!removeFromOverride && IsOverride(index))
+        _locationChangeBuffer.TryGetValue(index, out var bufferedLocation);
+        _indexLocations.TryGetValue(index, out var oldLocation);
+
+        //removeFromOverride is false 99% of the time.
+        if ((bufferedLocation ?? oldLocation) is GlobalOverride or LocalOverride && !removeFromOverride)
             return;
 
-        if (_indexLocations.TryGetValue(index, out var oldLocation) &&
-            oldLocation is GridChunkLocation oldGrid &&
+        if (oldLocation is GridChunkLocation oldGrid &&
             oldGrid.ChunkIndices == chunkIndices &&
             oldGrid.GridId == gridId)
         {
@@ -497,22 +537,26 @@ public sealed class PVSCollection<TIndex> : IPVSCollection where TIndex : ICompa
     /// <param name="forceDirty">If true, this will mark the previous chunk as dirty even if the entity did not move from that chunk.</param>
     public void UpdateIndex(TIndex index, MapId mapId, Vector2i chunkIndices, bool removeFromOverride = false, bool forceDirty = false)
     {
-        if(!removeFromOverride && IsOverride(index))
+        _locationChangeBuffer.TryGetValue(index, out var bufferedLocation);
+        _indexLocations.TryGetValue(index, out var oldLocation);
+
+        //removeFromOverride is false 99% of the time.
+        if ((bufferedLocation ?? oldLocation) is GlobalOverride or LocalOverride && !removeFromOverride)
             return;
 
-        if (_indexLocations.TryGetValue(index, out var oldLocation) &&
-            oldLocation is MapChunkLocation oldMap &&
+        // Is this entity just returning to its old location?
+        if (oldLocation is MapChunkLocation oldMap &&
             oldMap.ChunkIndices == chunkIndices &&
             oldMap.MapId == mapId)
         {
-            _locationChangeBuffer.Remove(index);
+            if (bufferedLocation != null)
+                _locationChangeBuffer.Remove(index);
 
             if (forceDirty)
                 _dirtyChunks.Add(oldMap);
             return;
         }
 
-
         RegisterUpdate(index, new MapChunkLocation(mapId, chunkIndices));
     }
 
@@ -584,7 +628,18 @@ public struct GridChunkLocation : IIndexLocation, IChunkIndexLocation, IEquatabl
     }
 }
 
-public struct GlobalOverride : IIndexLocation { }
+public struct GlobalOverride : IIndexLocation
+{
+    /// <summary>
+    /// If true, this will also send all children of the override.
+    /// </summary>
+    public readonly bool Recursive;
+
+    public GlobalOverride(bool recursive)
+    {
+        Recursive = recursive;
+    }
+}
 
 public struct LocalOverride : IIndexLocation
 {

Robust.Server/GameStates/PvsOverrideSystem.cs

@@ -12,20 +12,23 @@ public sealed class PvsOverrideSystem : EntitySystem
     [Shared.IoC.Dependency] private readonly PvsSystem _pvs = default!;
 
     /// <summary>
-    ///     Used to ensure that an entity is always sent to every client. Overrides any client-specific overrides.
+    ///     Used to ensure that an entity is always sent to every client. By default this overrides any client-specific overrides.
     /// </summary>
-    public void AddGlobalOverride(EntityUid uid)
+    /// <param name="removeExistingOverride">Whether or not to supersede existing overrides.</param>
+    /// <param name="recursive">If true, this will also recursively send any children of the given index.</param>
+    public void AddGlobalOverride(EntityUid uid, bool removeExistingOverride = true, bool recursive = false)
     {
-        _pvs.EntityPVSCollection.UpdateIndex(uid, true);
+        _pvs.EntityPVSCollection.AddGlobalOverride(uid, removeExistingOverride, recursive);
     }
 
     /// <summary>
     ///     Used to ensure that an entity is always sent to a specific client. Overrides any global or pre-existing
     ///     client-specific overrides.
     /// </summary>
-    public void AddSessionOverride(EntityUid uid, ICommonSession session)
+    /// <param name="removeExistingOverride">Whether or not to supersede existing overrides.</param>
+    public void AddSessionOverride(EntityUid uid, ICommonSession session,bool removeExistingOverride = true)
     {
-        _pvs.EntityPVSCollection.UpdateIndex(uid, session, true);
+        _pvs.EntityPVSCollection.UpdateIndex(uid, session, removeExistingOverride);
     }
 
     /// <summary>

Robust.Server/GameStates/PvsSystem.cs

@@ -2,7 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Numerics;
-using System.Runtime.CompilerServices;
 using System.Text;
 using Microsoft.Extensions.ObjectPool;
 using Robust.Server.Configuration;
@@ -13,11 +12,9 @@ using Robust.Shared.Collections;
 using Robust.Shared.Configuration;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
-using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Maths;
-using Robust.Shared.Physics;
 using Robust.Shared.Players;
 using Robust.Shared.Threading;
 using Robust.Shared.Timing;
@@ -107,6 +104,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
     private EntityQuery<EyeComponent> _eyeQuery;
     private EntityQuery<TransformComponent> _xformQuery;
+    private EntityQuery<MetaDataComponent> _metaQuery;
 
     public override void Initialize()
     {
@@ -114,6 +112,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
         _eyeQuery = GetEntityQuery<EyeComponent>();
         _xformQuery = GetEntityQuery<TransformComponent>();
+        _metaQuery = GetEntityQuery<MetaDataComponent>();
 
         _entityPvsCollection = RegisterPVSCollection<EntityUid>();
 
@@ -387,7 +386,7 @@ internal sealed partial class PvsSystem : EntitySystem
             pvsCollection.AddGrid(gridId);
         }
 
-        _entityPvsCollection.UpdateIndex(gridId);
+        _entityPvsCollection.AddGlobalOverride(gridId, true, false);
     }
 
     private void OnMapDestroyed(MapChangedEvent e)
@@ -407,7 +406,7 @@ internal sealed partial class PvsSystem : EntitySystem
 
         if(e.Map == MapId.Nullspace) return;
         var uid = _mapManager.GetMapEntityId(e.Map);
-        _entityPvsCollection.UpdateIndex(uid);
+        _entityPvsCollection.AddGlobalOverride(uid, true, false);
     }
 
     #endregion
@@ -749,6 +748,16 @@ internal sealed partial class PvsSystem : EntitySystem
         }
         globalEnumerator.Dispose();
 
+
+        var globalRecursiveEnumerator = _entityPvsCollection.GlobalRecursiveOverridesEnumerator;
+        while (globalRecursiveEnumerator.MoveNext())
+        {
+            var uid = globalRecursiveEnumerator.Current;
+            RecursivelyAddOverride(in uid, lastAcked, lastSent, visibleEnts, lastSeen, in mQuery, in tQuery, in fromTick,
+                ref newEntityCount, ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget, true);
+        }
+        globalRecursiveEnumerator.Dispose();
+
         var localEnumerator = _entityPvsCollection.GetElementsForSession(session);
         while (localEnumerator.MoveNext())
         {
@@ -764,7 +773,7 @@ internal sealed partial class PvsSystem : EntitySystem
                 ref newEntityCount, ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget);
         }
 
-        var expandEvent = new ExpandPvsEvent(session, new List<EntityUid>());
+        var expandEvent = new ExpandPvsEvent(session);
         RaiseLocalEvent(ref expandEvent);
         foreach (var entityUid in expandEvent.Entities)
         {
@@ -772,6 +781,12 @@ internal sealed partial class PvsSystem : EntitySystem
                 ref newEntityCount, ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget);
         }
 
+        foreach (var entityUid in expandEvent.RecursiveEntities)
+        {
+            RecursivelyAddOverride(in entityUid, lastAcked, lastSent, visibleEnts, lastSeen, in mQuery, in tQuery, in fromTick,
+                ref newEntityCount, ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget, true);
+        }
+
         var entityStates = new List<EntityState>(entStateCount);
 
         foreach (var (uid, visiblity) in visibleEnts)
@@ -898,8 +913,7 @@ internal sealed partial class PvsSystem : EntitySystem
         }
     }
 
-    public bool RecursivelyAddOverride(
-        in EntityUid uid,
+    public bool RecursivelyAddOverride(in EntityUid uid,
         Dictionary<EntityUid, PvsEntityVisibility>? lastAcked,
         Dictionary<EntityUid, PvsEntityVisibility>? lastSent,
         Dictionary<EntityUid, PvsEntityVisibility> toSend,
@@ -911,34 +925,74 @@ internal sealed partial class PvsSystem : EntitySystem
         ref int enteredEntityCount,
         ref int entStateCount,
         in int newEntityBudget,
-        in int enteredEntityBudget)
+        in int enteredEntityBudget,
+        bool addChildren = false)
     {
         //are we valid?
         //sometimes uids gets added without being valid YET (looking at you mapmanager) (mapcreate & gridcreated fire before the uids becomes valid)
-        if (!uid.IsValid()) return false;
+        if (!uid.IsValid())
+            return false;
 
-        var parent = transQuery.GetComponent(uid).ParentUid;
+        var xform = transQuery.GetComponent(uid);
+        var parent = xform.ParentUid;
         if (parent.IsValid() && !RecursivelyAddOverride(in parent, lastAcked, lastSent, toSend, lastSeen, in metaQuery, in transQuery, in fromTick,
                 ref newEntityCount, ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget))
             return false;
 
         //did we already get added?
-        if (toSend.ContainsKey(uid)) return true;
         // Note that we check this AFTER adding parents. This is because while this entity may already have been added
         // to the toSend set, it doesn't guarantee that its parents have been. E.g., if a player ghost just teleported
         // to follow a far away entity, the player's own entity is still being sent, but we need to ensure that we also
         // send the new parents, which may otherwise be delayed because of the PVS budget..
+        if (!toSend.ContainsKey(uid))
+        {
+            // TODO PERFORMANCE.
+            // ProcessEntry() unnecessarily checks lastSent.ContainsKey() and maybe lastSeen.Contains(). Given that at this
+            // point the budgets are just ignored, this should just bypass those checks. But then again 99% of the time this
+            // is just the player's own entity + maybe a singularity. So currently not all that performance intensive.
+            var (entered, _) = ProcessEntry(in uid, lastAcked, lastSent, lastSeen, ref newEntityCount, ref enteredEntityCount, newEntityBudget, enteredEntityBudget);
+            AddToSendSet(in uid, metaQuery.GetComponent(uid), toSend, fromTick, in entered, ref entStateCount);
+        }
 
-        // TODO PERFORMANCE.
-        // ProcessEntry() unnecessarily checks lastSent.ContainsKey() and maybe lastSeen.Contains(). Given that at this
-        // point the budgets are just ignored, this should just bypass those checks. But then again 99% of the time this
-        // is just the player's own entity + maybe a singularity. So currently not all that performance intensive.
-        var (entered, _) = ProcessEntry(in uid, lastAcked, lastSent, lastSeen, ref newEntityCount, ref enteredEntityCount, newEntityBudget, enteredEntityBudget);
+        if (addChildren)
+        {
+            RecursivelyAddChildren(xform, lastAcked, lastSent, toSend, lastSeen, fromTick, ref newEntityCount,
+                ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget);
+        }
 
-        AddToSendSet(in uid, metaQuery.GetComponent(uid), toSend, fromTick, in entered, ref entStateCount);
         return true;
     }
 
+    private void RecursivelyAddChildren(TransformComponent xform,
+        Dictionary<EntityUid, PvsEntityVisibility>? lastAcked,
+        Dictionary<EntityUid, PvsEntityVisibility>? lastSent,
+        Dictionary<EntityUid, PvsEntityVisibility> toSend,
+        Dictionary<EntityUid, GameTick> lastSeen,
+        in GameTick fromTick,
+        ref int newEntityCount,
+        ref int enteredEntityCount,
+        ref int entStateCount,
+        in int newEntityBudget,
+        in int enteredEntityBudget)
+    {
+        foreach (var child in xform.ChildEntities)
+        {
+            if (!_xformQuery.TryGetComponent(child, out var childXform))
+                continue;
+
+            if (!toSend.ContainsKey(child))
+            {
+                var (entered, _) = ProcessEntry(in child, lastAcked, lastSent, lastSeen, ref newEntityCount,
+                    ref enteredEntityCount, newEntityBudget, enteredEntityBudget);
+
+                AddToSendSet(in child, _metaQuery.GetComponent(child), toSend, fromTick, in entered, ref entStateCount);
+            }
+
+            RecursivelyAddChildren(childXform, lastAcked, lastSent, toSend, lastSeen, fromTick, ref newEntityCount,
+                ref enteredEntityCount, ref entStateCount, in newEntityBudget, in enteredEntityBudget);
+        }
+    }
+
     private (bool Entered, bool ShouldAdd) ProcessEntry(in EntityUid uid,
         Dictionary<EntityUid, PvsEntityVisibility>? lastAcked,
         Dictionary<EntityUid, PvsEntityVisibility>? lastSent,
@@ -1034,26 +1088,20 @@ internal sealed partial class PvsSystem : EntitySystem
             while (query.MoveNext(out var uid, out var md))
             {
                 DebugTools.Assert(md.EntityLifeStage >= EntityLifeStage.Initialized);
+                DebugTools.Assert(md.EntityLifeStage < EntityLifeStage.Terminating);
                 if (md.EntityLastModifiedTick <= fromTick)
                     continue;
 
                 var state = GetEntityState(player, uid, fromTick, md);
 
-                // Temporary debugging code.
-                // TODO REMOVE TEMPORARY CODE
                 if (state.Empty)
                 {
-                    var msg = $"{nameof(GetEntityState)} returned an empty state while enumerating all. Entity {ToPrettyString(uid)}. Net component Data:";
-                    foreach (var (_, cmp) in EntityManager.GetNetComponents(uid))
-                    {
-                        msg += $"\nName: {_factory.GetComponentName(cmp.GetType())}" +
-                               $"Enabled: {cmp.NetSyncEnabled}, " +
-                               $"Lifestage: {cmp.LifeStage}, " +
-                               $"OwnerOnly: {cmp.SendOnlyToOwner}, " +
-                               $"SessionSpecific: {cmp.SessionSpecific}, " +
-                               $"LastModified: {cmp.LastModifiedTick}";
-                    }
-                    Log.Error(msg);
+                    Log.Error($@"{nameof(GetEntityState)} returned an empty state while enumerating entities. 
+Tick: {fromTick}--{_gameTiming.CurTick}
+Entity: {ToPrettyString(uid)}
+Last modified: {md.EntityLastModifiedTick}
+Metadata last modified: {md.LastModifiedTick}
+Transform last modified: {Transform(uid).LastModifiedTick}");
                 }
 
                 stateEntities.Add(state);
@@ -1077,26 +1125,21 @@ internal sealed partial class PvsSystem : EntitySystem
                         continue;
 
                     DebugTools.Assert(md.EntityLifeStage >= EntityLifeStage.Initialized);
-                    DebugTools.Assert(md.EntityLastModifiedTick >= md.CreationTick || md.EntityLastModifiedTick == GameTick.Zero);
-                    DebugTools.Assert(md.EntityLastModifiedTick > fromTick || md.EntityLastModifiedTick == GameTick.Zero);
+                    DebugTools.Assert(md.EntityLifeStage < EntityLifeStage.Terminating);
+                    DebugTools.Assert(md.EntityLastModifiedTick >= md.CreationTick);
+                    DebugTools.Assert(md.EntityLastModifiedTick > fromTick);
 
                     var state = GetEntityState(player, uid, fromTick, md);
 
-                    // Temporary debugging code.
-                    // TODO REMOVE TEMPORARY CODE
                     if (state.Empty)
                     {
-                        var msg = $"{nameof(GetEntityState)} returned an empty state for new entity {ToPrettyString(uid)}. Net component Data:";
-                        foreach (var (_, cmp) in EntityManager.GetNetComponents(uid))
-                        {
-                            msg += $"\nName: {_factory.GetComponentName(cmp.GetType())}" +
-                                   $"Enabled: {cmp.NetSyncEnabled}, " +
-                                   $"Lifestage: {cmp.LifeStage}, " +
-                                   $"OwnerOnly: {cmp.SendOnlyToOwner}, " +
-                                   $"SessionSpecific: {cmp.SessionSpecific}, " +
-                                   $"LastModified: {cmp.LastModifiedTick}";
-                        }
-                        Log.Error(msg);
+                        Log.Error($@"{nameof(GetEntityState)} returned an empty state for a new entity.
+Tick: {fromTick}--{_gameTiming.CurTick}
+Entity: {ToPrettyString(uid)}
+Last modified: {md.EntityLastModifiedTick}
+Metadata last modified: {md.LastModifiedTick}
+Transform last modified: {Transform(uid).LastModifiedTick}");
+                        continue;
                     }
 
                     stateEntities.Add(state);
@@ -1109,8 +1152,9 @@ internal sealed partial class PvsSystem : EntitySystem
                         continue;
 
                     DebugTools.Assert(md.EntityLifeStage >= EntityLifeStage.Initialized);
-                    DebugTools.Assert(md.EntityLastModifiedTick >= md.CreationTick || md.EntityLastModifiedTick == GameTick.Zero);
-                    DebugTools.Assert(md.EntityLastModifiedTick > fromTick || md.EntityLastModifiedTick == GameTick.Zero);
+                    DebugTools.Assert(md.EntityLifeStage < EntityLifeStage.Terminating);
+                    DebugTools.Assert(md.EntityLastModifiedTick >= md.CreationTick);
+                    DebugTools.Assert(md.EntityLastModifiedTick > fromTick);
 
                     var state = GetEntityState(player, uid, fromTick, md);
                     if (!state.Empty)
@@ -1330,11 +1374,20 @@ internal sealed partial class PvsSystem : EntitySystem
 public readonly struct ExpandPvsEvent
 {
     public readonly IPlayerSession Session;
-    public readonly List<EntityUid> Entities;
 
-    public ExpandPvsEvent(IPlayerSession session, List<EntityUid> entities)
+    /// <summary>
+    /// List of entities that will get added to this session's PVS set.
+    /// </summary>
+    public readonly List<EntityUid> Entities = new();
+
+    /// <summary>
+    /// List of entities that will get added to this session's PVS set. Unlike <see cref="Entities"/> this will also
+    /// recursively add all children of the given entity.
+    /// </summary>
+    public readonly List<EntityUid> RecursiveEntities = new();
+
+    public ExpandPvsEvent(IPlayerSession session)
     {
         Session = session;
-        Entities = entities;
     }
 }