Version: 0.15.1.0

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

.github/workflows/benchmarks.yml

@@ -1,11 +1,13 @@
 name: Benchmarks
-#on:
-#  push
-  #schedule:
-  #  - cron: '0 5 * * *'
-  #push:
-  #  tags:
-  #    - 'v*'
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 5 * * *'
+  push:
+    tags:
+      - 'v*'
+
+concurrency: benchmarks
 
 env:
   ROBUST_BENCHMARKS_ENABLE_SQL: 1
@@ -20,14 +22,14 @@ jobs:
     name: Run Benchmarks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: true
-      - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: 6.0.x
-      - name: Install dependencies
-        run: dotnet restore
-      - name: Run benchmark
-        run: cd Robust.Benchmarks && sudo dotnet run --filter '*' --configuration Release
+    - name: Run script on centcomm
+      uses: appleboy/ssh-action@master
+      with:
+        host: centcomm.spacestation14.io
+        username: robust-benchmark-runner
+        key: ${{ secrets.CENTCOMM_ROBUST_BENCHMARK_RUNNER_KEY }}
+        command_timeout: 100000m 
+        script: |
+          wget https://raw.githubusercontent.com/space-wizards/RobustToolbox/${{ github.sha }}/Tools/run_benchmarks.py
+          python3 run_benchmarks.py "${{ secrets.BENCHMARKS_WRITE_ADDRESS }}" "${{ secrets.BENCHMARKS_WRITE_PORT }}" "${{ secrets.BENCHMARKS_WRITE_USER }}" "${{ secrets.BENCHMARKS_WRITE_PASSWORD }}" "${{ github.sha }}"
+          rm run_benchmarks.py

.gitmodules

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

MSBuild/Robust.Engine.Version.props

@@ -1,4 +1,4 @@
 <Project>
     <!-- This file automatically reset by Tools/version.py -->
-    <PropertyGroup><Version>0.8.86</Version></PropertyGroup>
+    <PropertyGroup><Version>0.15.1.0</Version></PropertyGroup>
 </Project>

Resources/Locale/en-US/controls.ftl

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

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

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

Robust.Benchmarks/Exporters/SQLExporter.cs

@@ -1,9 +1,10 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using BenchmarkDotNet.Exporters;
 using BenchmarkDotNet.Loggers;
 using BenchmarkDotNet.Mathematics;
@@ -11,6 +12,9 @@ using BenchmarkDotNet.Reports;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Design;
 using Npgsql;
+using Npgsql.Internal;
+using Npgsql.Internal.TypeHandlers;
+using Npgsql.Internal.TypeHandling;
 
 namespace Robust.Benchmarks.Exporters;
 
@@ -68,6 +72,13 @@ public sealed class SQLExporter : IExporter
         using var ctx = new BenchmarkContext(builder.Options);
         try
         {
+            ctx.Database.OpenConnection();
+            var con = (NpgsqlConnection) ctx.Database.GetDbConnection();
+            con.TypeMapper.AddTypeResolverFactory(new JsonOverrideTypeHandlerResolverFactory(new JsonSerializerOptions
+            {
+                NumberHandling = JsonNumberHandling.AllowNamedFloatingPointLiterals
+            }));
+
             ctx.Database.Migrate();
             ctx.BenchmarkRuns.Add(BenchmarkRun.FromSummary(summary, gitHash));
             ctx.SaveChanges();
@@ -81,6 +92,45 @@ public sealed class SQLExporter : IExporter
     public string Name => "sql";
 }
 
+// https://github.com/npgsql/efcore.pg/issues/1107#issuecomment-945126627
+class JsonOverrideTypeHandlerResolverFactory : TypeHandlerResolverFactory
+{
+    private readonly JsonSerializerOptions _options;
+
+    public JsonOverrideTypeHandlerResolverFactory(JsonSerializerOptions options)
+        => _options = options;
+
+    public override TypeHandlerResolver Create(NpgsqlConnector connector)
+        => new JsonOverrideTypeHandlerResolver(connector, _options);
+
+    public override string? GetDataTypeNameByClrType(Type clrType)
+        => null;
+
+    public override TypeMappingInfo? GetMappingByDataTypeName(string dataTypeName)
+        => null;
+
+    class JsonOverrideTypeHandlerResolver : TypeHandlerResolver
+    {
+        readonly JsonHandler _jsonbHandler;
+
+        internal JsonOverrideTypeHandlerResolver(NpgsqlConnector connector, JsonSerializerOptions options)
+            => _jsonbHandler ??= new JsonHandler(
+                connector.DatabaseInfo.GetPostgresTypeByName("jsonb"),
+                connector.TextEncoding,
+                isJsonb: true,
+                options);
+
+        public override NpgsqlTypeHandler? ResolveByDataTypeName(string typeName)
+            => typeName == "jsonb" ? _jsonbHandler : null;
+
+        public override NpgsqlTypeHandler? ResolveByClrType(Type type)
+            // You can add any user-defined CLR types which you want mapped to jsonb
+            => type == typeof(JsonDocument) ? _jsonbHandler : null;
+
+        public override TypeMappingInfo? GetMappingByDataTypeName(string dataTypeName)
+            => null; // Let the built-in resolver do this
+    }
+}
 public sealed class DesignTimeContextFactoryPostgres : IDesignTimeDbContextFactory<BenchmarkContext>
 {
     public BenchmarkContext CreateDbContext(string[] args)
@@ -101,12 +151,14 @@ public class BenchmarkContext : DbContext
 
 public class BenchmarkRun
 {
-    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
-    public ulong Id { get; set; }
+    public int Id { get; set; }
     public string GitHash { get; set; } = string.Empty;
+
     [Column(TypeName = "timestamptz")]
     public DateTime RunDate { get; set; }
+
     public string Name { get; set; } = string.Empty;
+
     [Column(TypeName = "jsonb")]
     public BenchmarkRunReport[] Reports { get; set; } = Array.Empty<BenchmarkRunReport>();
 

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

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

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

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

Robust.Benchmarks/Migrations/BenchmarkContextModelSnapshot.cs

@@ -24,9 +24,11 @@ namespace Robust.Benchmarks.Migrations
 
             modelBuilder.Entity("Robust.Benchmarks.Exporters.BenchmarkRun", b =>
                 {
-                    b.Property<decimal>("Id")
+                    b.Property<int>("Id")
                         .ValueGeneratedOnAdd()
-                        .HasColumnType("numeric(20,0)");
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
 
                     b.Property<string>("GitHash")
                         .IsRequired()
@@ -41,7 +43,7 @@ namespace Robust.Benchmarks.Migrations
                         .HasColumnType("jsonb");
 
                     b.Property<DateTime>("RunDate")
-                        .HasColumnType("Date");
+                        .HasColumnType("timestamptz");
 
                     b.HasKey("Id");
 

Robust.Benchmarks/Robust.Benchmarks.csproj

@@ -6,6 +6,7 @@
         <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
         <OutputPath>../bin/Benchmarks</OutputPath>
         <OutputType>Exe</OutputType>
+        <NoWarn>RA0003</NoWarn>
     </PropertyGroup>
     <ItemGroup>
       <ProjectReference Include="..\Robust.Server\Robust.Server.csproj" />
@@ -18,7 +19,7 @@
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         <PrivateAssets>all</PrivateAssets>
       </PackageReference>
-      <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.0-rc.2" />
+      <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.4" />
     </ItemGroup>
     <Import Project="..\MSBuild\Robust.Engine.targets" />
 </Project>

Robust.Benchmarks/Serialization/BenchmarkIntSerializer.cs

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

Robust.Benchmarks/Serialization/Copy/SerializationCopyBenchmark.cs

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

Robust.Benchmarks/Serialization/Definitions/SeedDataDefinition.cs

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

Robust.Benchmarks/Serialization/Read/SerializationReadBenchmark.cs

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

Robust.Benchmarks/Serialization/SerializationArrayBenchmark.cs

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

Robust.Benchmarks/Serialization/Write/SerializationWriteBenchmark.cs

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

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

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

Robust.Client/Audio/Midi/IMidiManager.cs

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

Robust.Client/Audio/Midi/IMidiRenderer.cs

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

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

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

Robust.Client/Audio/Midi/MidiManager.cs

@@ -7,6 +7,7 @@ using NFluidsynth;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
 using Robust.Shared;
+using Robust.Shared.Asynchronous;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
 using Robust.Shared.GameObjects;
@@ -15,404 +16,435 @@ using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 using Robust.Shared.Physics;
-using Robust.Shared.Physics.Broadphase;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
-using Logger = Robust.Shared.Log.Logger;
 
-namespace Robust.Client.Audio.Midi
+namespace Robust.Client.Audio.Midi;
+
+internal sealed partial class MidiManager : IMidiManager
 {
-    public interface IMidiManager
+    [Dependency] private readonly IEyeManager _eyeManager = default!;
+    [Dependency] private readonly IResourceManagerInternal _resourceManager = default!;
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+    [Dependency] private readonly IConfigurationManager _cfgMan = default!;
+    [Dependency] private readonly IClydeAudio _clydeAudio = default!;
+    [Dependency] private readonly ITaskManager _taskManager = default!;
+    [Dependency] private readonly ILogManager _logger = default!;
+
+    private SharedPhysicsSystem _broadPhaseSystem = default!;
+
+    public IReadOnlyList<IMidiRenderer> Renderers
     {
-        /// <summary>
-        ///     This method tries to return a midi renderer ready to be used.
-        ///     You only need to set the <see cref="IMidiRenderer.MidiProgram"/> afterwards.
-        /// </summary>
-        /// <remarks>
-        ///     This method can fail if MIDI support is not available.
-        /// </remarks>
-        /// <returns>
-        ///     <c>null</c> if MIDI support is not available.
-        /// </returns>
-        IMidiRenderer? GetNewRenderer();
-
-        /// <summary>
-        ///     Method called every frame.
-        ///     Should be used to update positional audio.
-        /// </summary>
-        /// <param name="frameTime"></param>
-        void FrameUpdate(float frameTime);
-
-        /// <summary>
-        ///     Volume, in db.
-        /// </summary>
-        float Volume { get; set; }
-
-        /// <summary>
-        ///     If true, MIDI support is available.
-        /// </summary>
-        bool IsAvailable { get; }
-
-        public int OcclusionCollisionMask { get; set; }
-
-        void Shutdown();
+        get
+        {
+            lock (_renderers)
+            {
+                // Perform a copy. Sadly, we can't return a reference to the original list due to threading concerns.
+                return _renderers.ToArray();
+            }
+        }
     }
 
-    internal sealed class MidiManager : IMidiManager
+    [ViewVariables]
+    public bool IsAvailable
     {
-        [Dependency] private readonly IEyeManager _eyeManager = default!;
-        [Dependency] private readonly IResourceManagerInternal _resourceManager = default!;
-        [Dependency] private readonly IEntityManager _entityManager = default!;
-        [Dependency] private readonly IConfigurationManager _cfgMan = default!;
-
-        private SharedPhysicsSystem _broadPhaseSystem = default!;
-
-        [ViewVariables]
-        public bool IsAvailable
+        get
         {
-            get
-            {
-                InitializeFluidsynth();
+            InitializeFluidsynth();
 
-                return FluidsynthInitialized;
-            }
+            return FluidsynthInitialized;
+        }
+    }
+
+    [ViewVariables]
+    private readonly List<IMidiRenderer> _renderers = new();
+
+    private bool _alive = true;
+    private Settings? _settings;
+    private Thread? _midiThread;
+    private ISawmill _midiSawmill = default!;
+    private float _volume = 0f;
+    private bool _volumeDirty = true;
+
+    // Not reliable until Fluidsynth is initialized!
+    [ViewVariables(VVAccess.ReadWrite)]
+    public float Volume
+    {
+        get => _volume;
+        set
+        {
+            if (MathHelper.CloseToPercent(_volume, value))
+                return;
+
+            _cfgMan.SetCVar(CVars.MidiVolume, value);
+            _volumeDirty = true;
+        }
+    }
+
+    private static readonly string[] LinuxSoundfonts =
+    {
+        "/usr/share/soundfonts/default.sf2",
+        "/usr/share/soundfonts/FluidR3_GM.sf2",
+        "/usr/share/soundfonts/freepats-general-midi.sf2",
+        "/usr/share/sounds/sf2/default.sf2",
+        "/usr/share/sounds/sf2/FluidR3_GM.sf2",
+        "/usr/share/sounds/sf2/TimGM6mb.sf2",
+    };
+
+    private const string WindowsSoundfont = @"C:\WINDOWS\system32\drivers\gm.dls";
+
+    private const string OsxSoundfont =
+        "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
+
+    private const string FallbackSoundfont = "/Midi/fallback.sf2";
+
+    private static ResourcePath CustomSoundfontDirectory = new ResourcePath("/soundfonts/");
+
+    private readonly ResourceLoaderCallbacks _soundfontLoaderCallbacks = new();
+
+    private bool FluidsynthInitialized;
+    private bool _failedInitialize;
+
+    private NFluidsynth.Logger.LoggerDelegate _loggerDelegate = default!;
+    private ISawmill _sawmill = default!;
+
+    [ViewVariables(VVAccess.ReadWrite)]
+    public int OcclusionCollisionMask { get; set; }
+
+    private void InitializeFluidsynth()
+    {
+        if (FluidsynthInitialized || _failedInitialize) return;
+
+        _volume = _cfgMan.GetCVar(CVars.MidiVolume);
+        _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
+        {
+            _volume = value;
+            _volumeDirty = true;
+        }, true);
+
+        _midiSawmill = _logger.GetSawmill("midi");
+        _midiSawmill.Level = LogLevel.Info;
+        _sawmill = _logger.GetSawmill("midi.fluidsynth");
+        _loggerDelegate = LoggerDelegate;
+
+        if (!_resourceManager.UserData.Exists(CustomSoundfontDirectory))
+        {
+            _resourceManager.UserData.CreateDir(CustomSoundfontDirectory);
+        }
+        // not a directory, preserve the old file and create an actual directory
+        else if (!_resourceManager.UserData.IsDir(CustomSoundfontDirectory))
+        {
+            _resourceManager.UserData.Rename(CustomSoundfontDirectory, CustomSoundfontDirectory.WithName(CustomSoundfontDirectory.Filename + ".old"));
+            _resourceManager.UserData.CreateDir(CustomSoundfontDirectory);
         }
 
-        [ViewVariables]
-        private readonly List<IMidiRenderer> _renderers = new();
-
-        private bool _alive = true;
-        private Settings? _settings;
-        private Thread? _midiThread;
-        private ISawmill _midiSawmill = default!;
-        private float _volume = 0f;
-        private bool _volumeDirty = true;
-
-        // Not reliable until Fluidsynth is initialized!
-        [ViewVariables(VVAccess.ReadWrite)]
-        public float Volume
+        try
         {
-            get => _volume;
-            set
-            {
-                if (MathHelper.CloseToPercent(_volume, value))
-                    return;
+            NFluidsynth.Logger.SetLoggerMethod(_loggerDelegate); // Will cause a safe DllNotFoundException if not available.
 
-                _cfgMan.SetCVar(CVars.MidiVolume, value);
-                _volumeDirty = true;
-            }
+            _settings = new Settings();
+            _settings["synth.sample-rate"].DoubleValue = 44100;
+            _settings["player.timing-source"].StringValue = "sample";
+            _settings["synth.lock-memory"].IntValue = 0;
+            _settings["synth.threadsafe-api"].IntValue = 1;
+            _settings["synth.gain"].DoubleValue = 1.0d;
+            _settings["synth.polyphony"].IntValue = 1024;
+            _settings["synth.cpu-cores"].IntValue = 2;
+            _settings["synth.midi-channels"].IntValue = 16;
+            _settings["synth.overflow.age"].DoubleValue = 3000;
+            _settings["audio.driver"].StringValue = "file";
+            _settings["audio.periods"].IntValue = 8;
+            _settings["audio.period-size"].IntValue = 4096;
+            _settings["midi.autoconnect"].IntValue = 1;
+            _settings["player.reset-synth"].IntValue = 0;
+            _settings["synth.midi-bank-select"].StringValue = "gm";
+            //_settings["synth.verbose"].IntValue = 1; // Useful for debugging.
+        }
+        catch (Exception e)
+        {
+            _midiSawmill.Warning(
+                "Failed to initialize fluidsynth due to exception, disabling MIDI support:\n{0}", e);
+            _failedInitialize = true;
+            return;
         }
 
-        private static readonly string[] LinuxSoundfonts =
-        {
-            "/usr/share/soundfonts/default.sf2",
-            "/usr/share/soundfonts/FluidR3_GM.sf2",
-            "/usr/share/soundfonts/freepats-general-midi.sf2",
-            "/usr/share/sounds/sf2/default.sf2",
-            "/usr/share/sounds/sf2/FluidR3_GM.sf2",
-            "/usr/share/sounds/sf2/TimGM6mb.sf2",
+        _midiThread = new Thread(ThreadUpdate);
+        _midiThread.Start();
+
+        _broadPhaseSystem = EntitySystem.Get<SharedPhysicsSystem>();
+        FluidsynthInitialized = true;
+    }
+
+    private void LoggerDelegate(NFluidsynth.Logger.LogLevel level, string message, IntPtr data)
+    {
+        var rLevel = level switch {
+            NFluidsynth.Logger.LogLevel.Panic => LogLevel.Error,
+            NFluidsynth.Logger.LogLevel.Error => LogLevel.Error,
+            NFluidsynth.Logger.LogLevel.Warning => LogLevel.Warning,
+            NFluidsynth.Logger.LogLevel.Information => LogLevel.Info,
+            NFluidsynth.Logger.LogLevel.Debug => LogLevel.Debug,
+            _ => LogLevel.Debug
         };
+        _sawmill.Log(rLevel, message);
+    }
 
-        private const string WindowsSoundfont = @"C:\WINDOWS\system32\drivers\gm.dls";
-
-        private const string OsxSoundfont =
-            "/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls";
-
-        private const string FallbackSoundfont = "/Midi/fallback.sf2";
-
-        private readonly ResourceLoaderCallbacks _soundfontLoaderCallbacks = new();
-
-        private bool FluidsynthInitialized;
-        private bool _failedInitialize;
-
-        private NFluidsynth.Logger.LoggerDelegate _loggerDelegate = default!;
-        private ISawmill _sawmill = default!;
-
-        [ViewVariables(VVAccess.ReadWrite)]
-        public int OcclusionCollisionMask { get; set; }
-
-        private void InitializeFluidsynth()
+    public IMidiRenderer? GetNewRenderer(bool mono = true)
+    {
+        if (!FluidsynthInitialized)
         {
-            if (FluidsynthInitialized || _failedInitialize) return;
+            InitializeFluidsynth();
 
-            _volume = _cfgMan.GetCVar(CVars.MidiVolume);
-            _cfgMan.OnValueChanged(CVars.MidiVolume, value =>
+            if (!FluidsynthInitialized) // init failed
             {
-                _volume = value;
-                _volumeDirty = true;
-            }, true);
-
-            _midiSawmill = Logger.GetSawmill("midi");
-            _sawmill = Logger.GetSawmill("midi.fluidsynth");
-            _loggerDelegate = LoggerDelegate;
-
-            try
-            {
-                NFluidsynth.Logger.SetLoggerMethod(_loggerDelegate); // Will cause a safe DllNotFoundException if not available.
-
-                _settings = new Settings();
-                _settings["synth.sample-rate"].DoubleValue = 44100;
-                _settings["player.timing-source"].StringValue = "sample";
-                _settings["synth.lock-memory"].IntValue = 0;
-                _settings["synth.threadsafe-api"].IntValue = 1;
-                _settings["synth.gain"].DoubleValue = 1.0d;
-                _settings["synth.polyphony"].IntValue = 1024;
-                _settings["synth.cpu-cores"].IntValue = 2;
-                _settings["synth.overflow.age"].DoubleValue = 3000;
-                _settings["audio.driver"].StringValue = "file";
-                _settings["audio.periods"].IntValue = 8;
-                _settings["audio.period-size"].IntValue = 4096;
-                _settings["midi.autoconnect"].IntValue = 1;
-                _settings["player.reset-synth"].IntValue = 0;
-                _settings["synth.midi-bank-select"].StringValue = "gm";
-            }
-            catch (Exception e)
-            {
-                Logger.WarningS("midi",
-                    "Failed to initialize fluidsynth due to exception, disabling MIDI support:\n{0}", e);
-                _failedInitialize = true;
-                return;
-            }
-
-            _midiThread = new Thread(ThreadUpdate);
-            _midiThread.Start();
-
-            _broadPhaseSystem = EntitySystem.Get<SharedPhysicsSystem>();
-            FluidsynthInitialized = true;
-        }
-
-        private void LoggerDelegate(NFluidsynth.Logger.LogLevel level, string message, IntPtr data)
-        {
-            var rLevel = level switch {
-                NFluidsynth.Logger.LogLevel.Panic => LogLevel.Error,
-                NFluidsynth.Logger.LogLevel.Error => LogLevel.Error,
-                NFluidsynth.Logger.LogLevel.Warning => LogLevel.Warning,
-                NFluidsynth.Logger.LogLevel.Information => LogLevel.Info,
-                NFluidsynth.Logger.LogLevel.Debug => LogLevel.Debug,
-                _ => LogLevel.Debug
-            };
-            _sawmill.Log(rLevel, message);
-        }
-
-        public IMidiRenderer? GetNewRenderer()
-        {
-            if (!FluidsynthInitialized)
-            {
-                InitializeFluidsynth();
-
-                if (!FluidsynthInitialized) // init failed
-                {
-                    return null;
-                }
-            }
-
-            var soundfontLoader = SoundFontLoader.NewDefaultSoundFontLoader(_settings);
-
-            // Just making double sure these don't get GC'd.
-            // They shouldn't, MidiRenderer keeps a ref, but making sure...
-            var handle = GCHandle.Alloc(soundfontLoader);
-
-            try
-            {
-                soundfontLoader.SetCallbacks(_soundfontLoaderCallbacks);
-
-                var renderer = new MidiRenderer(_settings!, soundfontLoader);
-
-                foreach (var file in _resourceManager.ContentFindFiles(("/Audio/MidiCustom/")))
-                {
-                    if (file.Extension != "sf2" && file.Extension != "dls") continue;
-                    renderer.LoadSoundfont(file.ToString());
-                }
-
-                // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
-                renderer.LoadSoundfont(FallbackSoundfont);
-
-                if (OperatingSystem.IsLinux())
-                {
-                    foreach (var filepath in LinuxSoundfonts)
-                    {
-                        if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath)) continue;
-
-                        try
-                        {
-                            renderer.LoadSoundfont(filepath, true);
-                        }
-                        catch (Exception)
-                        {
-                            continue;
-                        }
-
-                        break;
-                    }
-                }
-                else if (OperatingSystem.IsMacOS())
-                {
-                    if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
-                        renderer.LoadSoundfont(OsxSoundfont, true);
-                }
-                else if (OperatingSystem.IsWindows())
-                {
-                    if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
-                        renderer.LoadSoundfont(WindowsSoundfont, true);
-                }
-
-                renderer.Source.SetVolume(Volume);
-
-                lock (_renderers)
-                {
-                    _renderers.Add(renderer);
-                }
-                return renderer;
-            }
-            finally
-            {
-                handle.Free();
+                return null;
             }
         }
 
-        public void FrameUpdate(float frameTime)
+        var soundfontLoader = SoundFontLoader.NewDefaultSoundFontLoader(_settings);
+
+        // Just making double sure these don't get GC'd.
+        // They shouldn't, MidiRenderer keeps a ref, but making sure...
+        var handle = GCHandle.Alloc(soundfontLoader);
+
+        try
         {
-            if (!FluidsynthInitialized)
+            soundfontLoader.SetCallbacks(_soundfontLoaderCallbacks);
+
+            var renderer = new MidiRenderer(_settings!, soundfontLoader, mono, this, _clydeAudio, _taskManager, _midiSawmill);
+
+            foreach (var file in _resourceManager.ContentFindFiles(("/Audio/MidiCustom/")))
             {
-                return;
+                if (file.Extension != "sf2" && file.Extension != "dls") continue;
+                renderer.LoadSoundfont(file.ToString());
             }
 
-            // Update positions of streams every frame.
-            foreach (var renderer in _renderers)
+            // Since the last loaded soundfont takes priority, we load the fallback soundfont before the soundfont.
+            renderer.LoadSoundfont(FallbackSoundfont);
+
+            if (OperatingSystem.IsLinux())
             {
-                if (renderer.Disposed)
-                    continue;
-
-                if(_volumeDirty)
-                    renderer.Source.SetVolume(Volume);
-
-                if (!renderer.Mono)
+                foreach (var filepath in LinuxSoundfonts)
                 {
-                    renderer.Source.SetGlobal();
-                    continue;
-                }
+                    if (!File.Exists(filepath) || !SoundFont.IsSoundFont(filepath)) continue;
 
-                MapCoordinates? mapPos = null;
-                var trackingEntity = renderer.TrackingEntity != null && !_entityManager.Deleted(renderer.TrackingEntity);
-                if (trackingEntity)
-                {
-                    renderer.TrackingCoordinates = _entityManager.GetComponent<TransformComponent>(renderer.TrackingEntity!.Value).Coordinates;
-                }
-
-                if (renderer.TrackingCoordinates != null)
-                {
-                    mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
-                }
-
-                if (mapPos != null && mapPos.Value.MapId == _eyeManager.CurrentMap)
-                {
-                    var pos = mapPos.Value;
-
-                    var sourceRelative = _eyeManager.CurrentEye.Position.Position - pos.Position;
-                    var occlusion = 0f;
-                    if (sourceRelative.Length > 0)
+                    try
                     {
-                        occlusion = _broadPhaseSystem.IntersectRayPenetration(
-                            pos.MapId,
-                            new CollisionRay(
-                                pos.Position,
-                                sourceRelative.Normalized,
-                                OcclusionCollisionMask),
-                            sourceRelative.Length,
-                            renderer.TrackingEntity);
+                        renderer.LoadSoundfont(filepath, true);
+                    }
+                    catch (Exception)
+                    {
+                        continue;
                     }
 
-                    renderer.Source.SetOcclusion(occlusion);
-
-                    if (!renderer.Source.SetPosition(pos.Position))
-                    {
-                        return;
-                    }
-
-                    if (trackingEntity)
-                    {
-                        renderer.Source.SetVelocity(renderer.TrackingEntity!.Value.GlobalLinearVelocity());
-                    }
-                }
-                else
-                {
-                    renderer.Source.SetOcclusion(float.MaxValue);
+                    break;
                 }
             }
-
-            _volumeDirty = false;
-        }
-
-        /// <summary>
-        ///     Main method for the thread rendering the midi audio.
-        /// </summary>
-        private void ThreadUpdate()
-        {
-            while (_alive)
+            else if (OperatingSystem.IsMacOS())
             {
-                lock (_renderers)
-                {
-                    for (var i = 0; i < _renderers.Count; i++)
-                    {
-                        var renderer = _renderers[i];
-                        if (!renderer.Disposed)
-                            renderer.Render();
-                        else
-                        {
-                            renderer.InternalDispose();
-                            _renderers.Remove(renderer);
-                        }
-                    }
-                }
-
-                Thread.Sleep(1);
+                if (File.Exists(OsxSoundfont) && SoundFont.IsSoundFont(OsxSoundfont))
+                    renderer.LoadSoundfont(OsxSoundfont, true);
+            }
+            else if (OperatingSystem.IsWindows())
+            {
+                if (File.Exists(WindowsSoundfont) && SoundFont.IsSoundFont(WindowsSoundfont))
+                    renderer.LoadSoundfont(WindowsSoundfont, true);
             }
-        }
 
-        public void Shutdown()
-        {
-            _alive = false;
-            _midiThread?.Join();
-            _settings?.Dispose();
+            // load every soundfont from the user data directory
+            _midiSawmill.Debug($"loading soundfonts from {CustomSoundfontDirectory.ToRelativePath().ToString()}/*");
+            var enumerator = _resourceManager.UserData.Find($"{CustomSoundfontDirectory.ToRelativePath().ToString()}/*").Item1;
+            foreach (var soundfont in enumerator)
+            {
+                if (soundfont.Extension != "sf2" && soundfont.Extension != "dls") continue;
+                _midiSawmill.Debug($"loading soundfont {soundfont}");
+                renderer.LoadSoundfont(soundfont.ToString());
+            }
+
+            renderer.Source.SetVolume(Volume);
 
             lock (_renderers)
             {
-                foreach (var renderer in _renderers)
-                {
-                    renderer?.Dispose();
-                }
+                _renderers.Add(renderer);
+            }
+            return renderer;
+        }
+        finally
+        {
+            handle.Free();
+        }
+    }
+
+    public void FrameUpdate(float frameTime)
+    {
+        if (!FluidsynthInitialized)
+        {
+            return;
+        }
+
+        // Update positions of streams every frame.
+        foreach (var renderer in _renderers)
+        {
+            if (renderer.Disposed)
+                continue;
+
+            if(_volumeDirty)
+                renderer.Source.SetVolume(Volume);
+
+            if (!renderer.Mono)
+            {
+                renderer.Source.SetGlobal();
+                continue;
             }
 
-            if (FluidsynthInitialized && !_failedInitialize)
+            MapCoordinates? mapPos = null;
+            var trackingEntity = renderer.TrackingEntity != null && !_entityManager.Deleted(renderer.TrackingEntity);
+            if (trackingEntity)
             {
-                NFluidsynth.Logger.SetLoggerMethod(null);
+                renderer.TrackingCoordinates = _entityManager.GetComponent<TransformComponent>(renderer.TrackingEntity!.Value).Coordinates;
+            }
+
+            if (renderer.TrackingCoordinates != null)
+            {
+                mapPos = renderer.TrackingCoordinates.Value.ToMap(_entityManager);
+            }
+
+            if (mapPos != null && mapPos.Value.MapId == _eyeManager.CurrentMap)
+            {
+                var pos = mapPos.Value;
+
+                var sourceRelative = _eyeManager.CurrentEye.Position.Position - pos.Position;
+                var occlusion = 0f;
+                if (sourceRelative.Length > 0)
+                {
+                    occlusion = _broadPhaseSystem.IntersectRayPenetration(
+                        pos.MapId,
+                        new CollisionRay(
+                            pos.Position,
+                            sourceRelative.Normalized,
+                            OcclusionCollisionMask),
+                        sourceRelative.Length,
+                        renderer.TrackingEntity);
+                }
+
+                renderer.Source.SetOcclusion(occlusion);
+
+                if (!renderer.Source.SetPosition(pos.Position))
+                {
+                    return;
+                }
+
+                if (trackingEntity)
+                {
+                    renderer.Source.SetVelocity(renderer.TrackingEntity!.Value.GlobalLinearVelocity());
+                }
+            }
+            else
+            {
+                renderer.Source.SetOcclusion(float.MaxValue);
             }
         }
 
-        /// <summary>
-        ///     This class is used to load soundfonts.
-        /// </summary>
-        private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
+        _volumeDirty = false;
+    }
+
+    /// <summary>
+    ///     Main method for the thread rendering the midi audio.
+    /// </summary>
+    private void ThreadUpdate()
+    {
+        while (_alive)
         {
-            private readonly Dictionary<int, Stream> _openStreams = new();
-            private int _nextStreamId = 1;
-
-            public override IntPtr Open(string filename)
+            lock (_renderers)
             {
-                if (string.IsNullOrEmpty(filename))
+                for (var i = 0; i < _renderers.Count; i++)
                 {
-                    return IntPtr.Zero;
+                    var renderer = _renderers[i];
+                    if (!renderer.Disposed)
+                        renderer.Render();
+                    else
+                    {
+                        renderer.InternalDispose();
+                        _renderers.Remove(renderer);
+                    }
                 }
+            }
 
-                Stream? stream;
-                var resourceCache = IoCManager.Resolve<IResourceCache>();
-                var resourcePath = new ResourcePath(filename);
+            Thread.Sleep(1);
+        }
+    }
 
-                if (resourcePath.IsRooted && resourceCache.ContentFileExists(filename))
+    public void Shutdown()
+    {
+        _alive = false;
+        _midiThread?.Join();
+        _settings?.Dispose();
+
+        lock (_renderers)
+        {
+            foreach (var renderer in _renderers)
+            {
+                renderer?.Dispose();
+            }
+        }
+
+        if (FluidsynthInitialized && !_failedInitialize)
+        {
+            NFluidsynth.Logger.SetLoggerMethod(null);
+        }
+    }
+
+    /// <summary>
+    ///     Internal method to get a human-readable representation of a <see cref="SequencerEvent"/>.
+    /// </summary>
+    internal static string SequencerEventToString(SequencerEvent midiEvent)
+    {
+        // ReSharper disable once UseStringInterpolation
+        return string.Format(
+            "{0} chan:{1:D2} key:{2:D5} bank:{3:D2} ctrl:{4:D5} dur:{5:D5} pitch:{6:D5} prog:{7:D3} val:{8:D5} vel:{9:D5}",
+            midiEvent.Type.ToString().PadLeft(22),
+            midiEvent.Channel,
+            midiEvent.Key,
+            midiEvent.Bank,
+            midiEvent.Control,
+            midiEvent.Duration,
+            midiEvent.Pitch,
+            midiEvent.Program,
+            midiEvent.Value,
+            midiEvent.Velocity);
+    }
+
+    /// <summary>
+    ///     This class is used to load soundfonts.
+    /// </summary>
+    private sealed class ResourceLoaderCallbacks : SoundFontLoaderCallbacks
+    {
+        private readonly Dictionary<int, Stream> _openStreams = new();
+        private int _nextStreamId = 1;
+
+        public override IntPtr Open(string filename)
+        {
+            if (string.IsNullOrEmpty(filename))
+            {
+                return IntPtr.Zero;
+            }
+
+            Stream? stream;
+            var resourceCache = IoCManager.Resolve<IResourceCache>();
+            var resourcePath = new ResourcePath(filename);
+
+            if (resourcePath.IsRooted)
+            {
+                // is it in content?
+                if (resourceCache.ContentFileExists(filename))
                 {
                     if (!resourceCache.TryContentFileRead(filename, out stream))
                         return IntPtr.Zero;
                 }
+                // is it in userdata?
+                else if (resourceCache.UserData.Exists(resourcePath))
+                {
+                    stream = resourceCache.UserData.OpenRead(resourcePath);
+                }
                 else if (File.Exists(filename))
                 {
                     stream = File.OpenRead(filename);
@@ -421,73 +453,81 @@ namespace Robust.Client.Audio.Midi
                 {
                     return IntPtr.Zero;
                 }
-
-                var id = _nextStreamId++;
-
-                _openStreams.Add(id, stream);
-
-                return (IntPtr) id;
+            }
+            else if (File.Exists(filename))
+            {
+                stream = File.OpenRead(filename);
+            }
+            else
+            {
+                return IntPtr.Zero;
             }
 
-            public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
-            {
-                var length = (int) count;
-                var span = new Span<byte>(buf.ToPointer(), length);
-                var stream = _openStreams[(int) sfHandle];
+            var id = _nextStreamId++;
 
-                // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
-                try
+            _openStreams.Add(id, stream);
+
+            return (IntPtr) id;
+        }
+
+        public override unsafe int Read(IntPtr buf, long count, IntPtr sfHandle)
+        {
+            var length = (int) count;
+            var span = new Span<byte>(buf.ToPointer(), length);
+            var stream = _openStreams[(int) sfHandle];
+
+            // Fluidsynth's docs state that this method should leave the buffer unmodified if it fails. (returns -1)
+            try
+            {
+                // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
+                if (count < 1024)
                 {
-                    // Fluidsynth does a LOT of tiny allocations (frankly, way too much).
-                    if (count < 1024)
-                    {
-                        // ReSharper disable once SuggestVarOrType_Elsewhere
-                        Span<byte> buffer = stackalloc byte[(int)count];
+                    // ReSharper disable once SuggestVarOrType_Elsewhere
+                    Span<byte> buffer = stackalloc byte[(int)count];
 
-                        stream.ReadExact(buffer);
+                    stream.ReadExact(buffer);
 
-                        buffer.CopyTo(span);
-                    }
-                    else
-                    {
-                        var buffer = stream.ReadExact(length);
-
-                        buffer.CopyTo(span);
-                    }
+                    buffer.CopyTo(span);
                 }
-                catch (EndOfStreamException)
+                else
                 {
-                    return -1;
+                    var buffer = stream.ReadExact(length);
+
+                    buffer.CopyTo(span);
                 }
-
-                return 0;
             }
-
-            public override int Seek(IntPtr sfHandle, int offset, SeekOrigin origin)
+            catch (EndOfStreamException)
             {
-                var stream = _openStreams[(int) sfHandle];
-
-                stream.Seek(offset, origin);
-
-                return 0;
+                return -1;
             }
 
-            public override int Tell(IntPtr sfHandle)
-            {
-                var stream = _openStreams[(int) sfHandle];
+            return 0;
+        }
 
-                return (int) stream.Position;
-            }
+        public override int Seek(IntPtr sfHandle, int offset, SeekOrigin origin)
+        {
+            var stream = _openStreams[(int) sfHandle];
 
-            public override int Close(IntPtr sfHandle)
-            {
-                if (!_openStreams.Remove((int) sfHandle, out var stream))
-                    return -1;
+            stream.Seek(offset, origin);
 
-                stream.Dispose();
-                return 0;
+            return 0;
+        }
+
+        public override int Tell(IntPtr sfHandle)
+        {
+            var stream = _openStreams[(int) sfHandle];
+
+            return (int) stream.Position;
+        }
+
+        public override int Close(IntPtr sfHandle)
+        {
+            if (!_openStreams.Remove((int) sfHandle, out var stream))
+                return -1;
+
+            stream.Dispose();
+            return 0;
 
-            }
         }
     }
 }

Robust.Client/BaseClient.cs

@@ -74,7 +74,7 @@ namespace Robust.Client
         {
             if (RunLevel == ClientRunLevel.Connecting)
             {
-                _net.Shutdown("Client mashing that connect button.");
+                _net.Reset("Client mashing that connect button.");
                 Reset();
             }
 

Robust.Client/ClientIoC.cs

@@ -11,6 +11,7 @@ using Robust.Client.Input;
 using Robust.Client.Map;
 using Robust.Client.Placement;
 using Robust.Client.Player;
+using Robust.Client.Profiling;
 using Robust.Client.Prototypes;
 using Robust.Client.Reflection;
 using Robust.Client.ResourceManagement;
@@ -75,6 +76,7 @@ namespace Robust.Client
             IoCManager.Register<IDiscordRichPresence, DiscordRichPresence>();
             IoCManager.Register<IMidiManager, MidiManager>();
             IoCManager.Register<IAuthManager, AuthManager>();
+            IoCManager.Register<ProfViewManager>();
             IoCManager.Register<IPhysicsManager, PhysicsManager>();
             switch (mode)
             {

Robust.Client/Console/ClientConsoleHost.cs

@@ -134,7 +134,7 @@ namespace Robust.Client.Console
             if (!NetManager.IsConnected) // we don't care about session on client
                 return;
 
-            var msg = NetManager.CreateNetMessage<MsgConCmd>();
+            var msg = new MsgConCmd();
             msg.Text = command;
             NetManager.ClientSendMessage(msg);
         }
@@ -198,7 +198,7 @@ namespace Robust.Client.Console
             if (!NetManager.IsConnected)
                 return;
 
-            var msg = NetManager.CreateNetMessage<MsgConCmdReg>();
+            var msg = new MsgConCmdReg();
             NetManager.ClientSendMessage(msg);
 
             _requestedCommands = true;

Robust.Client/Console/Commands/PhysicsOverlayCommands.cs

@@ -8,12 +8,12 @@ namespace Robust.Client.Console.Commands
     {
         public string Command => "physics";
         public string Description => $"Shows a debug physics overlay. The arg supplied specifies the overlay.";
-        public string Help => $"{Command} <aabbs / contactnormals / contactpoints / joints / shapeinfo / shapes>";
+        public string Help => $"{Command} <aabbs / com / contactnormals / contactpoints / joints / shapeinfo / shapes>";
         public void Execute(IConsoleShell shell, string argStr, string[] args)
         {
             if (args.Length != 1)
             {
-                shell.WriteLine($"Invalid number of args supplied");
+                shell.WriteError($"Invalid number of args supplied");
                 return;
             }
 
@@ -43,7 +43,7 @@ namespace Robust.Client.Console.Commands
                     system.Flags ^= PhysicsDebugFlags.Shapes;
                     break;
                 default:
-                    shell.WriteLine($"{args[0]} is not a recognised overlay");
+                    shell.WriteError($"{args[0]} is not a recognised overlay");
                     return;
             }
 

Robust.Client/Console/Commands/SendGarbageCommand.cs

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

Robust.Client/Console/ScriptClient.ScriptConsoleServer.cs

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

Robust.Client/Console/ScriptClient.cs

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

Robust.Client/Debugging/DebugPhysicsSystem.cs

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

Robust.Client/GameController/GameController.Redialler.cs

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

Robust.Client/GameController/GameController.cs

@@ -21,14 +21,16 @@ using Robust.Shared;
 using Robust.Shared.Asynchronous;
 using Robust.Shared.Configuration;
 using Robust.Shared.ContentPack;
-using Robust.Shared.GameObjects;
+using Robust.Shared.Exceptions;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
 using Robust.Shared.Network;
+using Robust.Shared.Profiling;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Threading;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using YamlDotNet.RepresentationModel;
@@ -66,6 +68,9 @@ namespace Robust.Client
         [Dependency] private readonly IAuthManager _authManager = default!;
         [Dependency] private readonly IMidiManager _midiManager = default!;
         [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IParallelManagerInternal _parallelMgr = default!;
+        [Dependency] private readonly ProfManager _prof = default!;
+        [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
 
         private IWebViewManagerHook? _webViewHook;
 
@@ -91,7 +96,8 @@ namespace Robust.Client
 
             _clyde.InitializePostWindowing();
             _clydeAudio.InitializePostWindowing();
-            _clyde.SetWindowTitle(Options.DefaultWindowTitle ?? _resourceManifest!.DefaultWindowTitle ?? "RobustToolbox");
+            _clyde.SetWindowTitle(
+                Options.DefaultWindowTitle ?? _resourceManifest!.DefaultWindowTitle ?? "RobustToolbox");
 
             _taskManager.Initialize();
             _fontManager.SetFontDpi((uint)_configurationManager.GetCVar(CVars.DisplayFontDpi));
@@ -131,8 +137,9 @@ namespace Robust.Client
             _inputManager.Initialize();
             _console.Initialize();
             _prototypeManager.Initialize();
+            _prototypeManager.LoadDirectory(new ResourcePath("/EnginePrototypes/"));
             _prototypeManager.LoadDirectory(Options.PrototypeDirectory);
-            _prototypeManager.Resync();
+            _prototypeManager.ResolveResults();
             _entityManager.Initialize();
             _mapManager.Initialize();
             _gameStateManager.Initialize();
@@ -157,7 +164,7 @@ namespace Robust.Client
             // Setup main loop
             if (_mainLoop == null)
             {
-                _mainLoop = new GameLoop(_gameTiming)
+                _mainLoop = new GameLoop(_gameTiming, _runtimeLog, _prof)
                 {
                     SleepMode = displayMode == DisplayMode.Headless ? SleepMode.Delay : SleepMode.None
                 };
@@ -197,7 +204,7 @@ namespace Robust.Client
 
             _clyde.Ready();
 
-            if (!Options.DisableCommandLineConnect &&
+            if (_resourceManifest!.AutoConnect &&
                 (_commandLineArgs?.Connect == true || _commandLineArgs?.Launcher == true)
                 && LaunchState.ConnectEndpoint != null)
             {
@@ -213,7 +220,7 @@ namespace Robust.Client
         {
             // Parses /manifest.yml for game-specific settings that cannot be exclusively set up by content code.
             if (!_resourceCache.TryContentFileRead("/manifest.yml", out var stream))
-                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null);
+                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null, true);
 
             var yamlStream = new YamlStream();
             using (stream)
@@ -223,7 +230,7 @@ namespace Robust.Client
             }
 
             if (yamlStream.Documents.Count == 0)
-                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null);
+                return new ResourceManifestData(Array.Empty<string>(), null, null, null, null, true);
 
             if (yamlStream.Documents.Count != 1 || yamlStream.Documents[0].RootNode is not YamlMappingNode mapping)
             {
@@ -258,7 +265,11 @@ namespace Robust.Client
             if (mapping.TryGetNode("splashLogo", out var splashNode))
                 splashLogo = splashNode.AsString();
 
-            return new ResourceManifestData(modules, assemblyPrefix, defaultWindowTitle, windowIconSet, splashLogo);
+            bool autoConnect = true;
+            if (mapping.TryGetNode("autoConnect", out var autoConnectNode))
+                autoConnect = autoConnectNode.AsBool();
+
+            return new ResourceManifestData(modules, assemblyPrefix, defaultWindowTitle, windowIconSet, splashLogo, autoConnect);
         }
 
         internal bool StartupSystemSplash(GameControllerOptions options, Func<ILogHandler>? logHandlerFactory)
@@ -326,6 +337,12 @@ namespace Robust.Client
 
             ProfileOptSetup.Setup(_configurationManager);
 
+            _parallelMgr.Initialize();
+            _prof.Initialize();
+#if !FULL_RELEASE
+            _configurationManager.OverrideDefault(CVars.ProfEnabled, true);
+#endif
+
             _resourceCache.Initialize(Options.LoadConfigAndUserData ? userDataDir : null);
 
             var mountOptions = _commandLineArgs != null
@@ -446,52 +463,127 @@ namespace Robust.Client
 
         private void Input(FrameEventArgs frameEventArgs)
         {
-            _clyde.ProcessInput(frameEventArgs);
-            _networkManager.ProcessPackets();
-            _taskManager.ProcessPendingTasks(); // tasks like connect
+            using (_prof.Group("Input Events"))
+            {
+                _clyde.ProcessInput(frameEventArgs);
+            }
+
+            using (_prof.Group("Network"))
+            {
+                _networkManager.ProcessPackets();
+            }
+
+            using (_prof.Group("Async"))
+            {
+                _taskManager.ProcessPendingTasks(); // tasks like connect
+            }
         }
 
         private void Tick(FrameEventArgs frameEventArgs)
         {
-            _modLoader.BroadcastUpdate(ModUpdateLevel.PreEngine, frameEventArgs);
-            _console.CommandBufferExecute();
-            _timerManager.UpdateTimers(frameEventArgs);
-            _taskManager.ProcessPendingTasks();
+            using (_prof.Group("Content pre engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.PreEngine, frameEventArgs);
+            }
+
+            using (_prof.Group("Console"))
+            {
+                _console.CommandBufferExecute();
+            }
+
+            using (_prof.Group("Timers"))
+            {
+                _timerManager.UpdateTimers(frameEventArgs);
+            }
+
+            using (_prof.Group("Async"))
+            {
+                _taskManager.ProcessPendingTasks();
+            }
 
             // GameStateManager is in full control of the simulation update in multiplayer.
             if (_client.RunLevel == ClientRunLevel.InGame || _client.RunLevel == ClientRunLevel.Connected)
             {
-                _gameStateManager.ApplyGameState();
+                using (_prof.Group("Game state"))
+                {
+                    _gameStateManager.ApplyGameState();
+                }
             }
 
             // In singleplayer, however, we're in full control instead.
             else if (_client.RunLevel == ClientRunLevel.SinglePlayerGame)
             {
-                // The last real tick is the current tick! This way we won't be in "prediction" mode.
-                _gameTiming.LastRealTick = _gameTiming.CurTick;
-                _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false);
+                using (_prof.Group("Entity"))
+                {
+                    // The last real tick is the current tick! This way we won't be in "prediction" mode.
+                    _gameTiming.LastRealTick = _gameTiming.CurTick;
+                    _entityManager.TickUpdate(frameEventArgs.DeltaSeconds, noPredictions: false);
+                }
             }
 
-            _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);
+            using (_prof.Group("Content post engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.PostEngine, frameEventArgs);
+            }
         }
 
         private void Update(FrameEventArgs frameEventArgs)
         {
-            _webViewHook?.Update();
-            _clydeAudio.FrameProcess(frameEventArgs);
-            _clyde.FrameProcess(frameEventArgs);
-            _modLoader.BroadcastUpdate(ModUpdateLevel.FramePreEngine, frameEventArgs);
-            _stateManager.FrameUpdate(frameEventArgs);
+            if (_webViewHook != null)
+            {
+                using (_prof.Group("WebView"))
+                {
+                    _webViewHook?.Update();
+                }
+            }
+
+            using (_prof.Group("ClydeAudio"))
+            {
+                _clydeAudio.FrameProcess(frameEventArgs);
+            }
+
+            using (_prof.Group("Clyde"))
+            {
+                _clyde.FrameProcess(frameEventArgs);
+            }
+
+            using (_prof.Group("Content Pre Engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.FramePreEngine, frameEventArgs);
+            }
+
+            using (_prof.Group("State"))
+            {
+                _stateManager.FrameUpdate(frameEventArgs);
+            }
 
             if (_client.RunLevel >= ClientRunLevel.Connected)
             {
-                _placementManager.FrameUpdate(frameEventArgs);
-                _entityManager.FrameUpdate(frameEventArgs.DeltaSeconds);
+                using (_prof.Group("Placement"))
+                {
+                    _placementManager.FrameUpdate(frameEventArgs);
+                }
+
+                using (_prof.Group("Entity"))
+                {
+                    _entityManager.FrameUpdate(frameEventArgs.DeltaSeconds);
+                }
             }
 
-            _overlayManager.FrameUpdate(frameEventArgs);
-            _userInterfaceManager.FrameUpdate(frameEventArgs);
-            _modLoader.BroadcastUpdate(ModUpdateLevel.FramePostEngine, frameEventArgs);
+            using (_prof.Group("Overlay"))
+            {
+                _overlayManager.FrameUpdate(frameEventArgs);
+            }
+
+            using (_prof.Group("UI"))
+            {
+                _userInterfaceManager.FrameUpdate(frameEventArgs);
+            }
+
+            using (_prof.Group("Content Post Engine"))
+            {
+                _modLoader.BroadcastUpdate(ModUpdateLevel.FramePostEngine, frameEventArgs);
+            }
         }
 
         internal static void SetupLogging(ILogManager logManager, Func<ILogHandler> logHandlerFactory)
@@ -584,7 +676,8 @@ namespace Robust.Client
             string? AssemblyPrefix,
             string? DefaultWindowTitle,
             string? WindowIconSet,
-            string? SplashLogo
+            string? SplashLogo,
+            bool AutoConnect
         );
     }
 }

Robust.Client/GameControllerOptions.cs

@@ -82,10 +82,5 @@ namespace Robust.Client
         ///     Whether to load config and user data.
         /// </summary>
         public bool LoadConfigAndUserData { get; init; } = true;
-
-        /// <summary>
-        ///     Whether to disable command line args server auto-connecting.
-        /// </summary>
-        public bool DisableCommandLineConnect { get; init; } = false;
     }
 }

Robust.Client/GameObjects/ClientEntityManager.cs

@@ -37,9 +37,9 @@ namespace Robust.Client.GameObjects
             return base.CreateEntity(prototypeName, uid);
         }
 
-        void IClientEntityManagerInternal.InitializeEntity(EntityUid entity)
+        void IClientEntityManagerInternal.InitializeEntity(EntityUid entity, MetaDataComponent? meta = null)
         {
-            base.InitializeEntity(entity);
+            base.InitializeEntity(entity, meta);
         }
 
         void IClientEntityManagerInternal.StartEntity(EntityUid entity)
@@ -86,7 +86,7 @@ namespace Robust.Client.GameObjects
 
         public void SendSystemNetworkMessage(EntityEventArgs message, uint sequence)
         {
-            var msg = _networkManager.CreateNetMessage<MsgEntity>();
+            var msg = new MsgEntity();
             msg.Type = EntityMessageType.SystemMessage;
             msg.SystemMessage = message;
             msg.SourceTick = _gameTiming.CurTick;

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

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

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

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

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

@@ -601,8 +601,10 @@ namespace Robust.Client.GameObjects
         private void RebuildBounds()
         {
             _bounds = new Box2();
-            foreach (var layer in Layers.Where(layer => layer.Visible))
+            foreach (var layer in Layers)
             {
+                if (!layer.Visible) continue;
+
                 _bounds = _bounds.Union(layer.CalculateBoundingBox());
             }
         }
@@ -1520,6 +1522,7 @@ namespace Robust.Client.GameObjects
             }
         }
 
+        [Obsolete("Use SpriteSystem instead.")]
         internal static RSI.State GetFallbackState(IResourceCache cache)
         {
             var rsi = cache.GetResource<RSIResource>("/Textures/error.rsi").RSI;
@@ -1968,7 +1971,7 @@ namespace Robust.Client.GameObjects
             /// <inheritdoc/>
             public Box2 CalculateBoundingBox()
             {
-                var textureSize = PixelSize / EyeManager.PixelsPerMeter;
+                var textureSize = (Vector2) PixelSize / EyeManager.PixelsPerMeter;
 
                 // If the parent has locked rotation and we don't have any rotation,
                 // we can take the quick path of just making a box the size of the texture.

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

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

Robust.Client/GameObjects/EntitySystems/ClientOccluderSystem.cs

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

Robust.Client/GameObjects/EntitySystems/DebugEntityLookupSystem.cs

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

Robust.Client/GameObjects/EntitySystems/GridChunkBoundsDebugSystem.cs

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

Robust.Client/GameObjects/EntitySystems/GridFixtureSystem.cs

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

Robust.Client/GameObjects/EntitySystems/ScaleVisualsSystem.cs

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

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

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using JetBrains.Annotations;
 using Robust.Client.Graphics;
 using Robust.Client.ResourceManagement;
@@ -17,13 +18,13 @@ public sealed partial class SpriteSystem
     [Dependency] private readonly IPrototypeManager _proto = default!;
     [Dependency] private readonly IResourceCache _resourceCache = default!;
 
-    [Pure]
+    private readonly Dictionary<string, IRsiStateLike> _cachedPrototypeIcons = new();
+
     public Texture Frame0(SpriteSpecifier specifier)
     {
         return RsiStateLike(specifier).Default;
     }
 
-    [Pure]
     public IRsiStateLike RsiStateLike(SpriteSpecifier specifier)
     {
         switch (specifier)
@@ -35,38 +36,71 @@ public sealed partial class SpriteSystem
                 return GetState(rsi);
 
             case SpriteSpecifier.EntityPrototype prototypeIcon:
-                if (!_proto.TryIndex<EntityPrototype>(prototypeIcon.EntityPrototypeId, out var prototype))
-                {
-                    Logger.Error("Failed to load PrototypeIcon {0}", prototypeIcon.EntityPrototypeId);
-                    return SpriteComponent.GetFallbackState(_resourceCache);
-                }
-
-                return SpriteComponent.GetPrototypeIcon(prototype, _resourceCache);
+                return GetPrototypeIcon(prototypeIcon.EntityPrototypeId);
 
             default:
                 throw new NotSupportedException();
         }
     }
 
-    [Pure]
-    public IRsiStateLike GetPrototypeIcon(EntityPrototype prototype, IResourceCache resourceCache)
+    /// <summary>
+    ///     Returns an icon for a given <see cref="EntityPrototype"/> ID, or a fallback in case of an error.
+    ///     This method caches the result based on the prototype identifier.
+    /// </summary>
+    public IRsiStateLike GetPrototypeIcon(string prototype)
     {
-        var icon = IconComponent.GetPrototypeIcon(prototype, _resourceCache);
-        if (icon != null) return icon;
+        // Check if this prototype has been cached before, and if so return the result.
+        if (_cachedPrototypeIcons.TryGetValue(prototype, out var cachedResult))
+            return cachedResult;
 
-        if (!prototype.Components.ContainsKey("Sprite"))
+        if (!_proto.TryIndex<EntityPrototype>(prototype, out var entityPrototype))
         {
-            return SpriteComponent.GetFallbackState(resourceCache);
+            // The specified prototype doesn't exist, return the fallback "error" sprite.
+            Logger.Error("Failed to load PrototypeIcon {0}", prototype);
+            return GetFallbackState();
         }
 
+        // Generate the icon and cache it in case it's ever needed again.
+        var result = GetPrototypeIcon(entityPrototype);
+        _cachedPrototypeIcons[prototype] = result;
+
+        return result;
+    }
+
+    /// <summary>
+    ///     Returns an icon for a given <see cref="EntityPrototype"/> ID, or a fallback in case of an error.
+    ///     This method does NOT cache the result.
+    /// </summary>
+    public IRsiStateLike GetPrototypeIcon(EntityPrototype prototype)
+    {
+        // IconComponent takes precedence. If it has a valid icon, return that. Otherwise, continue as normal.
+        if (prototype.Components.TryGetValue("Icon", out var compData)
+            && compData is IconComponent {Icon: {} icon})
+        {
+            return icon.Default;
+        }
+
+        // If the prototype doesn't have a SpriteComponent, then there's nothing we can do but return the fallback.
+        if (!prototype.Components.ContainsKey("Sprite"))
+        {
+            return GetFallbackState();
+        }
+
+        // Finally, we use spawn a dummy entity to get its icon.
         var dummy = Spawn(prototype.ID, MapCoordinates.Nullspace);
         var spriteComponent = EnsureComp<SpriteComponent>(dummy);
-        var result = spriteComponent.Icon ?? SpriteComponent.GetFallbackState(resourceCache);
+        var result = spriteComponent.Icon ?? GetFallbackState();
         Del(dummy);
 
         return result;
     }
 
+    [Pure]
+    public RSI.State GetFallbackState()
+    {
+        return _resourceCache.GetFallback<RSIResource>().RSI["error"];
+    }
+
     [Pure]
     public RSI.State GetState(SpriteSpecifier.Rsi rsiSpecifier)
     {
@@ -79,6 +113,20 @@ public sealed partial class SpriteSystem
         }
 
         Logger.Error("Failed to load RSI {0}", rsiSpecifier.RsiPath);
-        return SpriteComponent.GetFallbackState(_resourceCache);
+        return GetFallbackState();
+    }
+
+    private void OnPrototypesReloaded(PrototypesReloadedEventArgs protoReloaded)
+    {
+        // Check if any EntityPrototype has been changed.
+        if (!protoReloaded.ByType.TryGetValue(typeof(EntityPrototype), out var changedSet))
+            return;
+
+        // Remove all changed prototypes from the cache, if they're there.
+        foreach (var (prototype, _) in changedSet.Modified)
+        {
+            // Let's be lazy and not regenerate them until something needs them again.
+            _cachedPrototypeIcons.Remove(prototype);
+        }
     }
 }

Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

@@ -23,9 +23,16 @@ namespace Robust.Client.GameObjects
         {
             base.Initialize();
 
+            _proto.PrototypesReloaded += OnPrototypesReloaded;
             SubscribeLocalEvent<SpriteUpdateInertEvent>(QueueUpdateInert);
         }
 
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            _proto.PrototypesReloaded -= OnPrototypesReloaded;
+        }
+
         private void QueueUpdateInert(SpriteUpdateInertEvent ev)
         {
             _inertUpdateQueue.Enqueue(ev.Sprite);

Robust.Client/GameObjects/IClientEntityManagerInternal.cs

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

Robust.Client/GameStates/ClientGameStateManager.cs

@@ -21,6 +21,7 @@ using Robust.Shared.Map;
 using Robust.Shared.Network;
 using Robust.Shared.Network.Messages;
 using Robust.Shared.Players;
+using Robust.Shared.Profiling;
 using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
@@ -54,6 +55,7 @@ namespace Robust.Client.GameStates
         [Dependency] private readonly IEntitySystemManager _entitySystemManager = default!;
         [Dependency] private readonly IClientEntityManager _entityManager = default!;
         [Dependency] private readonly IInputManager _inputManager = default!;
+        [Dependency] private readonly ProfManager _prof = default!;
 #if EXCEPTION_TOLERANCE
         [Dependency] private readonly IRuntimeLog _runtimeLog = default!;
 #endif
@@ -224,18 +226,28 @@ namespace Robust.Client.GameStates
                     ResetPredictedEntities(_timing.CurTick);
                 }
 
-                if (!curState.Extrapolated)
+                using (_prof.Group("FullRep"))
                 {
-                    _processor.UpdateFullRep(curState);
+                    if (!curState.Extrapolated)
+                    {
+                        _processor.UpdateFullRep(curState);
+                    }
                 }
 
                 // Store last tick we got from the GameStateProcessor.
                 _lastProcessedTick = _timing.CurTick;
 
                 // apply current state
-                var createdEntities = ApplyGameState(curState, nextState);
+                List<EntityUid> createdEntities;
+                using (_prof.Group("ApplyGameState"))
+                {
+                    createdEntities = ApplyGameState(curState, nextState);
+                }
 
-                MergeImplicitData(createdEntities);
+                using (_prof.Group("MergeImplicitData"))
+                {
+                    MergeImplicitData(createdEntities);
+                }
 
                 if (_lastProcessedSeq < curState.LastProcessedInput)
                 {
@@ -270,6 +282,7 @@ namespace Robust.Client.GameStates
 
             if (IsPredictionEnabled)
             {
+                using var _p = _prof.Group("Prediction");
                 using var _ = _timing.StartPastPredictionArea();
 
                 if (_pendingInputs.Count > 0)
@@ -290,6 +303,8 @@ namespace Robust.Client.GameStates
 
                 for (var t = _lastProcessedTick.Value + 1; t <= targetTick; t++)
                 {
+                    var groupStart = _prof.WriteGroupStart();
+
                     var tick = new GameTick(t);
                     _timing.CurTick = tick;
 
@@ -321,20 +336,36 @@ namespace Robust.Client.GameStates
 
                     if (t != targetTick)
                     {
-                        // Don't run EntitySystemManager.TickUpdate if this is the target tick,
-                        // because the rest of the main loop will call into it with the target tick later,
-                        // and it won't be a past prediction.
-                        _entitySystemManager.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: false);
-                        ((IBroadcastEventBusInternal) _entities.EventBus).ProcessEventQueue();
+                        using (_prof.Group("Systems"))
+                        {
+                            // Don't run EntitySystemManager.TickUpdate if this is the target tick,
+                            // because the rest of the main loop will call into it with the target tick later,
+                            // and it won't be a past prediction.
+                            _entitySystemManager.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: false);
+                        }
+
+                        using (_prof.Group("Event queue"))
+                        {
+                            ((IBroadcastEventBusInternal) _entities.EventBus).ProcessEventQueue();
+                        }
                     }
+
+                    _prof.WriteGroupEnd(groupStart, "Prediction tick", ProfData.Int64(t));
                 }
             }
 
-            _entities.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: !IsPredictionEnabled);
+            using (_prof.Group("Tick"))
+            {
+                _entities.TickUpdate((float) _timing.TickPeriod.TotalSeconds, noPredictions: !IsPredictionEnabled);
+            }
         }
 
         private void ResetPredictedEntities(GameTick curTick)
         {
+            using var _ = _prof.Group("ResetPredictedEntities");
+
+            var countReset = 0;
+
             foreach (var meta in _entityManager.EntityQuery<MetaDataComponent>(true))
             {
                 var entity = meta.Owner;
@@ -355,6 +386,8 @@ namespace Robust.Client.GameStates
                     continue;
                 }
 
+                countReset += 1;
+
                 // TODO: handle component deletions/creations.
                 foreach (var (netId, comp) in _entityManager.GetNetComponents(entity))
                 {
@@ -374,6 +407,8 @@ namespace Robust.Client.GameStates
                     comp.HandleComponentState(compState, null);
                 }
             }
+
+            _prof.WriteValue("Reset count", ProfData.Int32(countReset));
         }
 
         private void MergeImplicitData(List<EntityUid> createdEntities)
@@ -409,27 +444,47 @@ namespace Robust.Client.GameStates
 
         private void AckGameState(GameTick sequence)
         {
-            var msg = _network.CreateNetMessage<MsgStateAck>();
+            var msg = new MsgStateAck();
             msg.Sequence = sequence;
             _network.ClientSendMessage(msg);
         }
 
         private List<EntityUid> ApplyGameState(GameState curState, GameState? nextState)
         {
-            _config.TickProcessMessages();
-            _mapManager.ApplyGameStatePre(curState.MapData, curState.EntityStates.Span);
-            var createdEntities = ApplyEntityStates(curState.EntityStates.Span, curState.EntityDeletions.Span,
-                nextState != null ? nextState.EntityStates.Span : default);
-            _players.ApplyPlayerStates(curState.PlayerStates.Value ?? Array.Empty<PlayerState>());
+            using (_prof.Group("Config"))
+            {
+                _config.TickProcessMessages();
+            }
+
+            using (_prof.Group("Map Pre"))
+            {
+                _mapManager.ApplyGameStatePre(curState.MapData, curState.EntityStates.Span);
+            }
+
+            List<EntityUid> createdEntities;
+            using (_prof.Group("Entity"))
+            {
+                createdEntities = ApplyEntityStates(curState.EntityStates.Span, curState.EntityDeletions.Span,
+                    nextState != null ? nextState.EntityStates.Span : default);
+            }
+
+            using (_prof.Group("Player"))
+            {
+                _players.ApplyPlayerStates(curState.PlayerStates.Value ?? Array.Empty<PlayerState>());
+            }
+
+            using (_prof.Group("Callback"))
+            {
+                GameStateApplied?.Invoke(new GameStateAppliedArgs(curState));
+            }
 
-            GameStateApplied?.Invoke(new GameStateAppliedArgs(curState));
             return createdEntities;
         }
 
         private List<EntityUid> ApplyEntityStates(ReadOnlySpan<EntityState> curEntStates, ReadOnlySpan<EntityUid> deletions,
             ReadOnlySpan<EntityState> nextEntStates)
         {
-            var toApply = new Dictionary<EntityUid, (EntityState?, EntityState?)>();
+            var toApply = new Dictionary<EntityUid, (EntityState?, EntityState?)>(curEntStates.Length);
             var toInitialize = new List<EntityUid>();
             var created = new List<EntityUid>();
 
@@ -537,6 +592,9 @@ namespace Robust.Client.GameStates
             }
 #endif
 
+            _prof.WriteValue("Created", ProfData.Int32(created.Count));
+            _prof.WriteValue("Applied", ProfData.Int32(toApply.Count));
+
             return created;
         }
 
@@ -548,6 +606,8 @@ namespace Robust.Client.GameStates
 
             if (curState != null)
             {
+                compStateWork.EnsureCapacity(curState.ComponentChanges.Span.Length);
+
                 foreach (var compChange in curState.ComponentChanges.Span)
                 {
                     if (compChange.Deleted)
@@ -580,6 +640,8 @@ namespace Robust.Client.GameStates
 
             if (nextState != null)
             {
+                compStateWork.EnsureCapacity(compStateWork.Count + nextState.ComponentChanges.Span.Length);
+
                 foreach (var compState in nextState.ComponentChanges.Span)
                 {
                     if (compStateWork.TryGetValue(compState.NetID, out var state))

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

@@ -50,7 +50,7 @@ namespace Robust.Client.Graphics.Clyde
 
                 var transform = _entityManager.GetComponent<TransformComponent>(grid.GridEntityId);
                 gridProgram.SetUniform(UniIModelMatrix, transform.WorldMatrix);
-                grid.GetMapChunks(worldBounds, out var enumerator);
+                var enumerator = grid.GetMapChunks(worldBounds);
 
                 while (enumerator.MoveNext(out var chunk))
                 {

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

@@ -14,6 +14,8 @@ using Robust.Shared;
 using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
+using Robust.Shared.Profiling;
+using OGLTextureWrapMode = OpenToolkit.Graphics.OpenGL.TextureWrapMode;
 
 namespace Robust.Client.Graphics.Clyde
 {
@@ -97,6 +99,7 @@ namespace Robust.Client.Graphics.Clyde
             ClearFramebuffer(_userInterfaceManager.GetMainClearColor());
 
             using (DebugGroup("UI"))
+            using (_prof.Group("UI"))
             {
                 _userInterfaceManager.Render(_renderHandle);
                 FlushRenderQueue();
@@ -104,8 +107,21 @@ namespace Robust.Client.Graphics.Clyde
 
             TakeScreenshot(ScreenshotType.Final);
 
-            // And finally, swap those buffers!
-            SwapAllBuffers();
+            using (_prof.Group("Swap buffers"))
+            {
+                // And finally, swap those buffers!
+                SwapAllBuffers();
+            }
+
+            using (_prof.Group("Stats"))
+            {
+                _prof.WriteValue("GL Draw Calls", ProfData.Int32(_debugStats.LastGLDrawCalls));
+                _prof.WriteValue("Clyde Draw Calls", ProfData.Int32(_debugStats.LastClydeDrawCalls));
+                _prof.WriteValue("Batches", ProfData.Int32(_debugStats.LastBatches));
+                _prof.WriteValue("Max Batch Verts", ProfData.Int32(_debugStats.LargestBatchVertices));
+                _prof.WriteValue("Max Batch Idxes", ProfData.Int32(_debugStats.LargestBatchIndices));
+                _prof.WriteValue("Lights", ProfData.Int32(_debugStats.TotalLights));
+            }
         }
 
         private void RenderOverlays(Viewport vp, OverlaySpace space, in Box2 worldBox, in Box2Rotated worldBounds)
@@ -140,11 +156,13 @@ namespace Robust.Client.Graphics.Clyde
             OverlaySpace space,
             in UIBox2i bounds)
         {
+            using var _ = _prof.Group($"Overlays SS {space}");
+
             var list = GetOverlaysForSpace(space);
 
             var worldAABB = CalcWorldAABB(vp);
             var worldBounds = CalcWorldBounds(vp);
-            var args = new OverlayDrawArgs(space, vpControl, vp, handle, bounds, worldAABB, worldBounds);
+            var args = new OverlayDrawArgs(space, vpControl, vp, handle, bounds, vp.Eye!.Position.MapId, worldAABB, worldBounds);
 
             foreach (var overlay in list)
             {
@@ -193,6 +211,12 @@ namespace Robust.Client.Graphics.Clyde
                 if (lastFrameSize != texture.Size)
                 {
                     GL.BindTexture(TextureTarget.Texture2D, screenBufferHandle.Handle);
+
+                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS,
+                        (int)OGLTextureWrapMode.MirroredRepeat);
+                    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT,
+                        (int)OGLTextureWrapMode.MirroredRepeat);
+
                     GL.TexImage2D(TextureTarget.Texture2D, 0,
                         _hasGLSrgb ? PixelInternalFormat.Srgb8Alpha8 : PixelInternalFormat.Rgba8, texture.Size.X,
                         texture.Size.Y, 0,
@@ -450,6 +474,8 @@ namespace Robust.Client.Graphics.Clyde
                 return;
             }
 
+            using var _ = _prof.Group("Viewport");
+
             RenderInRenderTarget(viewport.RenderTarget, () =>
             {
                 using var _ = DebugGroup($"Viewport: {viewport.Name}");
@@ -471,24 +497,33 @@ namespace Robust.Client.Graphics.Clyde
                 if (_eyeManager.CurrentMap != MapId.Nullspace)
                 {
                     using (DebugGroup("Lights"))
+                    using (_prof.Group("Lights"))
                     {
                         DrawLightsAndFov(viewport, worldBounds, worldAABB, eye);
                     }
 
-                    RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowWorld, worldAABB, worldBounds);
+                    using (_prof.Group("Overlays WSBW"))
+                    {
+                        RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowWorld, worldAABB, worldBounds);
+                    }
 
                     using (DebugGroup("Grids"))
+                    using (_prof.Group("Grids"))
                     {
                         _drawGrids(viewport, worldBounds, eye);
                     }
 
                     // We will also render worldspace overlays here so we can do them under / above entities as necessary
                     using (DebugGroup("Entities"))
+                    using (_prof.Group("Entities"))
                     {
                         DrawEntities(viewport, worldBounds, worldAABB, eye);
                     }
 
-                    RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowFOV, worldAABB, worldBounds);
+                    using (_prof.Group("Overlays WSBFOV"))
+                    {
+                        RenderOverlays(viewport, OverlaySpace.WorldSpaceBelowFOV, worldAABB, worldBounds);
+                    }
 
                     if (_lightManager.Enabled && _lightManager.DrawHardFov && eye.DrawFov)
                     {
@@ -521,7 +556,10 @@ namespace Robust.Client.Graphics.Clyde
                         UIBox2.FromDimensions(Vector2.Zero, viewport.Size), new Color(1, 1, 1, 0.5f));
                 }
 
-                RenderOverlays(viewport, OverlaySpace.WorldSpace, worldAABB, worldBounds);
+                using (_prof.Group("Overlays WS"))
+                {
+                    RenderOverlays(viewport, OverlaySpace.WorldSpace, worldAABB, worldBounds);
+                }
 
                 _currentViewport = oldVp;
             }, viewport.ClearColor);

Robust.Client/Graphics/Clyde/Clyde.Helpers.cs

@@ -272,7 +272,7 @@ namespace Robust.Client.Graphics.Clyde
             }
         }
 
-        private void LoadGLProc<T>(string name, out T field) where T : Delegate
+        private nint LoadGLProc(string name)
         {
             var proc = _glBindingsContext.GetProcAddress(name);
             if (proc == IntPtr.Zero || proc == new IntPtr(1) || proc == new IntPtr(2))
@@ -280,7 +280,7 @@ namespace Robust.Client.Graphics.Clyde
                 throw new InvalidOperationException($"Unable to load GL function '{name}'!");
             }
 
-            field = Marshal.GetDelegateForFunctionPointer<T>(proc);
+            return proc;
         }
     }
 }

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

@@ -84,6 +84,7 @@ namespace Robust.Client.Graphics.Clyde
 
         // For depth calculation of lighting shadows.
         private RenderTexture _shadowRenderTarget = default!;
+
         // Used because otherwise a MaxLightsPerScene change callback getting hit on startup causes interesting issues (read: bugs)
         private bool _shadowRenderTargetCanInitializeSafely = false;
 
@@ -91,7 +92,8 @@ namespace Robust.Client.Graphics.Clyde
         private ClydeTexture FovTexture => _fovRenderTarget.Texture;
         private ClydeTexture ShadowTexture => _shadowRenderTarget.Texture;
 
-        private (PointLightComponent light, Vector2 pos, float distanceSquared)[] _lightsToRenderList = new (PointLightComponent light, Vector2 pos, float distanceSquared)[LightsToRenderListSize];
+        private (PointLightComponent light, Vector2 pos, float distanceSquared)[] _lightsToRenderList =
+            new (PointLightComponent light, Vector2 pos, float distanceSquared)[LightsToRenderListSize];
 
         private unsafe void InitLighting()
         {
@@ -151,7 +153,8 @@ namespace Robust.Client.Graphics.Clyde
 
             // FOV FBO.
             _fovRenderTarget = CreateRenderTarget((FovMapSize, 2),
-                new RenderTargetFormatParameters(_hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
+                new RenderTargetFormatParameters(
+                    _hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
                 new TextureSampleParameters { WrapMode = TextureWrapMode.Repeat },
                 nameof(_fovRenderTarget));
 
@@ -175,7 +178,8 @@ namespace Robust.Client.Graphics.Clyde
             var depthVert = ReadEmbeddedShader("shadow-depth.vert");
             var depthFrag = ReadEmbeddedShader("shadow-depth.frag");
 
-            (string, uint)[] attribLocations = {
+            (string, uint)[] attribLocations =
+            {
                 ("aPos", 0),
                 ("subVertex", 1)
             };
@@ -208,6 +212,7 @@ namespace Robust.Client.Graphics.Clyde
         private void DrawFov(Viewport viewport, IEye eye)
         {
             using var _ = DebugGroup(nameof(DrawFov));
+            using var _p = _prof.Group("DrawFov");
 
             PrepareDepthDraw(RtToLoaded(_fovRenderTarget));
 
@@ -294,6 +299,7 @@ namespace Robust.Client.Graphics.Clyde
             {
                 GL.ClearColor(1, 1, 1, 1);
             }
+
             CheckGlError();
             GL.Clear(ClearBufferMask.DepthBufferBit | ClearBufferMask.ColorBufferBit);
             CheckGlError();
@@ -336,7 +342,14 @@ namespace Robust.Client.Graphics.Clyde
                 return;
             }
 
-            var (lights, count, expandedBounds) = GetLightsToRender(mapId, worldBounds, worldAABB);
+            (PointLightComponent light, Vector2 pos, float distanceSquared)[] lights;
+            int count;
+            Box2 expandedBounds;
+            using (_prof.Group("LightsToRender"))
+            {
+                (lights, count, expandedBounds) = GetLightsToRender(mapId, worldBounds, worldAABB);
+            }
+
             eye.GetViewMatrixNoOffset(out var eyeTransform, eye.Scale);
 
             UpdateOcclusionGeometry(mapId, expandedBounds, eyeTransform);
@@ -352,6 +365,7 @@ namespace Robust.Client.Graphics.Clyde
             }
 
             using (DebugGroup("Draw shadow depth"))
+            using (_prof.Group("Draw shadow depth"))
             {
                 PrepareDepthDraw(RtToLoaded(_shadowRenderTarget));
                 GL.CullFace(CullFaceMode.Back);
@@ -389,7 +403,8 @@ namespace Robust.Client.Graphics.Clyde
 
             ApplyLightingFovToBuffer(viewport, eye);
 
-            var lightShader = _loadedShaders[_enableSoftShadows ? _lightSoftShaderHandle : _lightHardShaderHandle].Program;
+            var lightShader = _loadedShaders[_enableSoftShadows ? _lightSoftShaderHandle : _lightHardShaderHandle]
+                .Program;
             lightShader.Use();
 
             SetupGlobalUniformsImmediate(lightShader, ShadowTexture);
@@ -411,78 +426,82 @@ namespace Robust.Client.Graphics.Clyde
             var lastSoftness = float.NaN;
             Texture? lastMask = null;
 
-            for (var i = 0; i < count; i++)
+            using (_prof.Group("Draw Lights"))
             {
-                var (component, lightPos, _) = lights[i];
-
-                var transform = _entityManager.GetComponent<TransformComponent>(component.Owner);
-
-                Texture? mask = null;
-                var rotation = Angle.Zero;
-                if (component.Mask != null)
+                for (var i = 0; i < count; i++)
                 {
-                    mask = component.Mask;
-                    rotation = component.Rotation;
+                    var (component, lightPos, _) = lights[i];
 
-                    if (component.MaskAutoRotate)
+                    var transform = _entityManager.GetComponent<TransformComponent>(component.Owner);
+
+                    Texture? mask = null;
+                    var rotation = Angle.Zero;
+                    if (component.Mask != null)
                     {
-                        rotation += transform.WorldRotation;
+                        mask = component.Mask;
+                        rotation = component.Rotation;
+
+                        if (component.MaskAutoRotate)
+                        {
+                            rotation += transform.WorldRotation;
+                        }
                     }
+
+                    var maskTexture = mask ?? Texture.White;
+                    if (lastMask != maskTexture)
+                    {
+                        SetTexture(TextureUnit.Texture0, maskTexture);
+                        lastMask = maskTexture;
+                        lightShader.SetUniformTextureMaybe(UniIMainTexture, TextureUnit.Texture0);
+                    }
+
+                    if (!MathHelper.CloseToPercent(lastRange, component.Radius))
+                    {
+                        lastRange = component.Radius;
+                        lightShader.SetUniformMaybe("lightRange", lastRange);
+                    }
+
+                    if (!MathHelper.CloseToPercent(lastPower, component.Energy))
+                    {
+                        lastPower = component.Energy;
+                        lightShader.SetUniformMaybe("lightPower", lastPower);
+                    }
+
+                    if (lastColor != component.Color)
+                    {
+                        lastColor = component.Color;
+                        lightShader.SetUniformMaybe("lightColor", lastColor);
+                    }
+
+                    if (_enableSoftShadows && !MathHelper.CloseToPercent(lastSoftness, component.Softness))
+                    {
+                        lastSoftness = component.Softness;
+                        lightShader.SetUniformMaybe("lightSoftness", lastSoftness);
+                    }
+
+                    lightShader.SetUniformMaybe("lightCenter", lightPos);
+                    lightShader.SetUniformMaybe("lightIndex",
+                        component.CastShadows ? (i + 0.5f) / ShadowTexture.Height : -1);
+
+                    var offset = new Vector2(component.Radius, component.Radius);
+
+                    Matrix3 matrix;
+                    if (mask == null)
+                    {
+                        matrix = Matrix3.Identity;
+                    }
+                    else
+                    {
+                        // Only apply rotation if a mask is said, because else it doesn't matter.
+                        matrix = Matrix3.CreateRotation(rotation);
+                    }
+
+                    (matrix.R0C2, matrix.R1C2) = lightPos;
+
+                    _drawQuad(-offset, offset, matrix, lightShader);
+
+                    _debugStats.TotalLights += 1;
                 }
-
-                var maskTexture = mask ?? Texture.White;
-                if (lastMask != maskTexture)
-                {
-                    SetTexture(TextureUnit.Texture0, maskTexture);
-                    lastMask = maskTexture;
-                    lightShader.SetUniformTextureMaybe(UniIMainTexture, TextureUnit.Texture0);
-                }
-
-                if (!MathHelper.CloseToPercent(lastRange, component.Radius))
-                {
-                    lastRange = component.Radius;
-                    lightShader.SetUniformMaybe("lightRange", lastRange);
-                }
-
-                if (!MathHelper.CloseToPercent(lastPower, component.Energy))
-                {
-                    lastPower = component.Energy;
-                    lightShader.SetUniformMaybe("lightPower", lastPower);
-                }
-
-                if (lastColor != component.Color)
-                {
-                    lastColor = component.Color;
-                    lightShader.SetUniformMaybe("lightColor", lastColor);
-                }
-
-                if (_enableSoftShadows && !MathHelper.CloseToPercent(lastSoftness, component.Softness))
-                {
-                    lastSoftness = component.Softness;
-                    lightShader.SetUniformMaybe("lightSoftness", lastSoftness);
-                }
-
-                lightShader.SetUniformMaybe("lightCenter", lightPos);
-                lightShader.SetUniformMaybe("lightIndex", component.CastShadows ? (i + 0.5f) / ShadowTexture.Height : -1);
-
-                var offset = new Vector2(component.Radius, component.Radius);
-
-                Matrix3 matrix;
-                if (mask == null)
-                {
-                    matrix = Matrix3.Identity;
-                }
-                else
-                {
-                    // Only apply rotation if a mask is said, because else it doesn't matter.
-                    matrix = Matrix3.CreateRotation(rotation);
-                }
-
-                (matrix.R0C2, matrix.R1C2) = lightPos;
-
-                _drawQuad(-offset, offset, matrix, lightShader);
-
-                _debugStats.TotalLights += 1;
             }
 
             ResetBlendFunc();
@@ -494,9 +513,15 @@ namespace Robust.Client.Graphics.Clyde
             if (_cfg.GetCVar(CVars.DisplayBlurLight))
                 BlurLights(viewport, eye);
 
-            BlurOntoWalls(viewport, eye);
+            using (_prof.Group("BlurOntoWalls"))
+            {
+                BlurOntoWalls(viewport, eye);
+            }
 
-            MergeWallLayer(viewport);
+            using (_prof.Group("MergeWallLayer"))
+            {
+                MergeWallLayer(viewport);
+            }
 
             BindRenderTargetFull(viewport.RenderTarget);
             GL.Viewport(0, 0, viewport.Size.X, viewport.Size.Y);
@@ -507,7 +532,8 @@ namespace Robust.Client.Graphics.Clyde
             _lightingReady = true;
         }
 
-        private ((PointLightComponent light, Vector2 pos, float distanceSquared)[] lights, int count, Box2 expandedBounds)
+        private ((PointLightComponent light, Vector2 pos, float distanceSquared)[] lights, int count, Box2
+            expandedBounds)
             GetLightsToRender(MapId map, in Box2Rotated worldBounds, in Box2 worldAABB)
         {
             var renderingTreeSystem = _entitySystemManager.GetEntitySystem<RenderingTreeSystem>();
@@ -521,36 +547,39 @@ namespace Robust.Client.Graphics.Clyde
             {
                 var bounds = xforms.GetComponent(comp.Owner).InvWorldMatrix.TransformBox(worldBounds);
 
-                comp.LightTree.QueryAabb(ref state, (ref (Clyde clyde, Box2 worldAABB, int count, int shadowCastingCount) state, in PointLightComponent light) =>
-                {
-                    if (state.count >= LightsToRenderListSize)
+                comp.LightTree.QueryAabb(ref state,
+                    (ref (Clyde clyde, Box2 worldAABB, int count, int shadowCastingCount) state,
+                        in PointLightComponent light) =>
                     {
-                        // There are too many lights to fit in the static memory.
-                        return false;
-                    }
+                        if (state.count >= LightsToRenderListSize)
+                        {
+                            // There are too many lights to fit in the static memory.
+                            return false;
+                        }
 
-                    var transform = xforms.GetComponent(light.Owner);
+                        var transform = xforms.GetComponent(light.Owner);
 
-                    if (float.IsNaN(transform.LocalPosition.X) || float.IsNaN(transform.LocalPosition.Y)) return true;
+                        if (float.IsNaN(transform.LocalPosition.X) || float.IsNaN(transform.LocalPosition.Y))
+                            return true;
 
-                    var lightPos = transform.WorldMatrix.Transform(light.Offset);
+                        var lightPos = transform.WorldMatrix.Transform(light.Offset);
 
-                    var circle = new Circle(lightPos, light.Radius);
+                        var circle = new Circle(lightPos, light.Radius);
+
+                        // If the light doesn't touch anywhere the camera can see, it doesn't matter.
+                        if (!circle.Intersects(state.worldAABB))
+                        {
+                            return true;
+                        }
+
+                        // If the light is a shadow casting light, keep a separate track of that
+                        if (light.CastShadows) state.shadowCastingCount++;
+
+                        float distanceSquared = (state.worldAABB.Center - lightPos).LengthSquared;
+                        state.clyde._lightsToRenderList[state.count++] = (light, lightPos, distanceSquared);
 
-                    // If the light doesn't touch anywhere the camera can see, it doesn't matter.
-                    if (!circle.Intersects(state.worldAABB))
-                    {
                         return true;
-                    }
-
-                    // If the light is a shadow casting light, keep a separate track of that
-                    if (light.CastShadows) state.shadowCastingCount++;
-
-                    float distanceSquared = (state.worldAABB.Center - lightPos).LengthSquared;
-                    state.clyde._lightsToRenderList[state.count++] = (light, lightPos, distanceSquared);
-
-                    return true;
-                }, bounds);
+                    }, bounds);
             }
 
             if (state.shadowCastingCount > _maxLightsPerScene)
@@ -560,18 +589,20 @@ namespace Robust.Client.Graphics.Clyde
 
                 // First, partition the array based on whether the lights are shadow casting or not
                 // (non shadow casting lights should be the first partition, shadow casting lights the second)
-                Array.Sort(_lightsToRenderList, 0, state.count, Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
-                {
-                    if (x.light.CastShadows && !y.light.CastShadows) return 1;
-                    else if (!x.light.CastShadows && y.light.CastShadows) return -1;
-                    else return 0;
-                }));
+                Array.Sort(_lightsToRenderList, 0, state.count,
+                    Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
+                    {
+                        if (x.light.CastShadows && !y.light.CastShadows) return 1;
+                        else if (!x.light.CastShadows && y.light.CastShadows) return -1;
+                        else return 0;
+                    }));
 
                 // Next, sort just the shadow casting lights by distance.
-                Array.Sort(_lightsToRenderList, state.count - state.shadowCastingCount, state.shadowCastingCount, Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
-                {
-                    return x.distanceSquared.CompareTo(y.distanceSquared);
-                }));
+                Array.Sort(_lightsToRenderList, state.count - state.shadowCastingCount, state.shadowCastingCount,
+                    Comparer<(PointLightComponent light, Vector2 pos, float distanceSquared)>.Create((x, y) =>
+                    {
+                        return x.distanceSquared.CompareTo(y.distanceSquared);
+                    }));
 
                 // Then effectively delete the furthest lights, by setting the end of the array to exclude N
                 // number of shadow casting lights (where N is the number above the max number per scene.)
@@ -755,7 +786,8 @@ namespace Robust.Client.Graphics.Clyde
         {
             GL.Clear(ClearBufferMask.StencilBufferBit);
             GL.Enable(EnableCap.StencilTest);
-            GL.StencilOp(OpenToolkit.Graphics.OpenGL4.StencilOp.Keep, OpenToolkit.Graphics.OpenGL4.StencilOp.Keep, OpenToolkit.Graphics.OpenGL4.StencilOp.Replace);
+            GL.StencilOp(OpenToolkit.Graphics.OpenGL4.StencilOp.Keep, OpenToolkit.Graphics.OpenGL4.StencilOp.Keep,
+                OpenToolkit.Graphics.OpenGL4.StencilOp.Replace);
             GL.StencilFunc(StencilFunction.Always, 1, 0xFF);
             GL.StencilMask(0xFF);
 
@@ -857,6 +889,9 @@ namespace Robust.Client.Graphics.Clyde
 
         private void UpdateOcclusionGeometry(MapId map, Box2 expandedBounds, Matrix3 eyeTransform)
         {
+            using var _ = _prof.Group("UpdateOcclusionGeometry");
+            using var _p = DebugGroup(nameof(UpdateOcclusionGeometry));
+
             // This method generates two sets of occlusion geometry:
             // 3D geometry used during depth projection.
             // 2D mask geometry used to apply wall bleed.
@@ -865,8 +900,6 @@ namespace Robust.Client.Graphics.Clyde
 
             const int maxOccluders = 2048;
 
-            using var _ = DebugGroup(nameof(UpdateOcclusionGeometry));
-
             // 16 = 4 vertices * 4 directions
             var arrayBuffer = ArrayPool<Vector4>.Shared.Rent(maxOccluders * 4 * 4);
             // multiplied by 2 (it's a vector2 of bytes)
@@ -971,6 +1004,7 @@ namespace Robust.Client.Graphics.Clyde
                             // I don't like this, but rotated occluders started happening
                             return Vector2.Dot(normal, a) <= 0;
                         }
+
                         var nV = ((!no) && CheckFaceEyeVis(dTl, dTr));
                         var sV = ((!so) && CheckFaceEyeVis(dBr, dBl));
                         var eV = ((!eo) && CheckFaceEyeVis(dTr, dBr));
@@ -999,6 +1033,7 @@ namespace Robust.Client.Graphics.Clyde
                                 // height
                                 arrayVIBuffer[avi++] = (byte)(((vi & 2) != 0) ? 0 : 255);
                             }
+
                             QuadBatchIndexWrite(indexBuffer, ref ii, (ushort)aiBase);
                         }
 
@@ -1074,7 +1109,9 @@ namespace Robust.Client.Graphics.Clyde
 
             var lightMapSize = GetLightMapSize(viewport.Size);
             var lightMapSizeQuart = GetLightMapSize(viewport.Size, true);
-            var lightMapColorFormat = _hasGLFloatFramebuffers ? RenderTargetColorFormat.R11FG11FB10F : RenderTargetColorFormat.Rgba8;
+            var lightMapColorFormat = _hasGLFloatFramebuffers
+                ? RenderTargetColorFormat.R11FG11FB10F
+                : RenderTargetColorFormat.Rgba8;
             var lightMapSampleParameters = new TextureSampleParameters { Filter = true };
 
             viewport.LightRenderTarget?.Dispose();
@@ -1147,9 +1184,11 @@ namespace Robust.Client.Graphics.Clyde
             {
                 DeleteRenderTexture(_shadowRenderTarget.Handle);
             }
+
             // Shadow FBO.
             _shadowRenderTarget = CreateRenderTarget((ShadowMapSize, _maxLightsPerScene),
-                new RenderTargetFormatParameters(_hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
+                new RenderTargetFormatParameters(
+                    _hasGLFloatFramebuffers ? RenderTargetColorFormat.RG32F : RenderTargetColorFormat.Rgba8, true),
                 new TextureSampleParameters { WrapMode = TextureWrapMode.Repeat, Filter = true },
                 nameof(_shadowRenderTarget));
         }

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

@@ -415,9 +415,15 @@ namespace Robust.Client.Graphics.Clyde
                     case float f:
                         program.SetUniform(name, f);
                         break;
+                    case float[] fArr:
+                        program.SetUniform(name, fArr);
+                        break;
                     case Vector2 vector2:
                         program.SetUniform(name, vector2);
                         break;
+                    case Vector2[] vector2Arr:
+                        program.SetUniform(name, vector2Arr);
+                        break;
                     case Vector3 vector3:
                         program.SetUniform(name, vector3);
                         break;

Robust.Client/Graphics/Clyde/Clyde.Shaders.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
@@ -395,12 +395,24 @@ namespace Robust.Client.Graphics.Clyde
                 data.Parameters[name] = value;
             }
 
+            private protected override void SetParameterImpl(string name, float[] value)
+            {
+                var data = Parent._shaderInstances[Handle];
+                data.Parameters[name] = value;
+            }
+
             private protected override void SetParameterImpl(string name, Vector2 value)
             {
                 var data = Parent._shaderInstances[Handle];
                 data.Parameters[name] = value;
             }
 
+            private protected override void SetParameterImpl(string name, Vector2[] value)
+            {
+                var data = Parent._shaderInstances[Handle];
+                data.Parameters[name] = value;
+            }
+
             private protected override void SetParameterImpl(string name, Vector3 value)
             {
                 var data = Parent._shaderInstances[Handle];

Robust.Client/Graphics/Clyde/Clyde.cs

@@ -14,6 +14,7 @@ using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Log;
 using Robust.Shared.Map;
+using Robust.Shared.Profiling;
 using Robust.Shared.Timing;
 using DependencyAttribute = Robust.Shared.IoC.DependencyAttribute;
 
@@ -35,6 +36,7 @@ namespace Robust.Client.Graphics.Clyde
         [Dependency] private readonly IEntitySystemManager _entitySystemManager = default!;
         [Dependency] private readonly IGameTiming _gameTiming = default!;
         [Dependency] private readonly IConfigurationManager _cfg = default!;
+        [Dependency] private readonly ProfManager _prof = default!;
 
         private GLUniformBuffer<ProjViewMatrices> ProjViewUBO = default!;
         private GLUniformBuffer<UniformConstants> UniformConstantsUBO = default!;
@@ -356,7 +358,7 @@ namespace Robust.Client.Graphics.Clyde
         }
 
         [Conditional("DEBUG")]
-        private void SetupDebugCallback()
+        private unsafe void SetupDebugCallback()
         {
             if (!_hasGLKhrDebug)
             {
@@ -367,19 +369,16 @@ namespace Robust.Client.Graphics.Clyde
             GL.Enable(EnableCap.DebugOutput);
             GL.Enable(EnableCap.DebugOutputSynchronous);
 
-            GCHandle.Alloc(_debugMessageCallbackInstance);
+            _debugMessageCallbackInstance ??= DebugMessageCallback;
 
             // OpenTK seemed to have trouble marshalling the delegate so do it manually.
 
             var procName = _isGLKhrDebugESExtension ? "glDebugMessageCallbackKHR" : "glDebugMessageCallback";
-            LoadGLProc(procName, out DebugMessageCallbackDelegate proc);
-            _debugMessageCallbackInstance = DebugMessageCallback;
+            var glDebugMessageCallback = (delegate* unmanaged[Stdcall] <nint, nint, void>) LoadGLProc(procName);
             var funcPtr = Marshal.GetFunctionPointerForDelegate(_debugMessageCallbackInstance);
-            proc(funcPtr, new IntPtr(0x3005));
+            glDebugMessageCallback(funcPtr, new IntPtr(0x3005));
         }
 
-        private delegate void DebugMessageCallbackDelegate(IntPtr funcPtr, IntPtr userParam);
-
         private void DebugMessageCallback(DebugSource source, DebugType type, int id, DebugSeverity severity,
             int length, IntPtr message, IntPtr userParam)
         {

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -412,10 +412,18 @@ namespace Robust.Client.Graphics.Clyde
             {
             }
 
+            private protected override void SetParameterImpl(string name, float[] value)
+            {
+            }
+
             private protected override void SetParameterImpl(string name, Vector2 value)
             {
             }
 
+            private protected override void SetParameterImpl(string name, Vector2[] value)
+            {
+            }
+
             private protected override void SetParameterImpl(string name, Vector3 value)
             {
             }

Robust.Client/Graphics/Clyde/GLContext/GLContextWindow.cs

@@ -195,11 +195,10 @@ namespace Robust.Client.Graphics.Clyde
 
             private void BlitThreadDoSecondaryWindowBlit(WindowData window)
             {
-                var rt = window.RenderTexture!;
-
                 if (Clyde._hasGLFenceSync)
                 {
                     // 0xFFFFFFFFFFFFFFFFUL is GL_TIMEOUT_IGNORED
+                    var rt = window.Reg.RenderTarget;
                     var sync = rt.LastGLSync;
                     GL.WaitSync(sync, WaitSyncFlags.None, unchecked((long) 0xFFFFFFFFFFFFFFFFUL));
                     Clyde.CheckGlError();
@@ -222,6 +221,8 @@ namespace Robust.Client.Graphics.Clyde
                 Clyde._windowing!.GLMakeContextCurrent(reg.Reg);
                 Clyde._windowing.GLSwapInterval(0);
 
+                Clyde.SetupDebugCallback();
+
                 if (!Clyde._isGLES)
                     GL.Enable(EnableCap.FramebufferSrgb);
 

Robust.Client/Graphics/Clyde/GLObjects/Clyde.ShaderProgram.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using OpenToolkit.Graphics.OpenGL4;
@@ -234,6 +234,19 @@ namespace Robust.Client.Graphics.Clyde
                 GL.Uniform1(uniformId, single);
             }
 
+            public void SetUniform(string uniformName, float[] singles)
+            {
+                var uniformId = GetUniform(uniformName);
+                GL.Uniform1(uniformId, singles.Length, singles);
+                _clyde.CheckGlError();
+            }
+
+            public void SetUniform(int uniformName, float[] singles)
+            {
+                var uniformId = GetUniform(uniformName);
+                GL.Uniform1(uniformId, singles.Length, singles);
+            }
+
             public void SetUniform(string uniformName, in Matrix3 matrix)
             {
                 var uniformId = GetUniform(uniformName);
@@ -375,6 +388,31 @@ namespace Robust.Client.Graphics.Clyde
                 }
             }
 
+            public void SetUniform(string uniformName, Vector2[] vector)
+            {
+                var uniformId = GetUniform(uniformName);
+                SetUniformDirect(uniformId, vector);
+            }
+
+            public void SetUniform(int uniformName, Vector2[] vector)
+            {
+                var uniformId = GetUniform(uniformName);
+                SetUniformDirect(uniformId, vector);
+            }
+
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            private void SetUniformDirect(int slot, Vector2[] vectors)
+            {
+                unsafe
+                {
+                    fixed (Vector2* ptr = &vectors[0])
+                    {
+                        GL.Uniform2(slot, vectors.Length, (float*)ptr);
+                        _clyde.CheckGlError();
+                    }
+                }
+            }
+
             public void SetUniformTexture(string uniformName, TextureUnit textureUnit)
             {
                 var uniformId = GetUniform(uniformName);

Robust.Client/Graphics/Drawing/DrawingHandleScreen.cs

@@ -56,28 +56,7 @@ namespace Robust.Client.Graphics
         /// <param name="str">The text to draw.</param>
         /// <param name="color">The color of text to draw.</param>
         public Vector2 DrawString(Font font, Vector2 pos, string str, Color color)
-        {
-            var advanceTotal = Vector2.Zero;
-            var baseLine = new Vector2(pos.X, font.GetAscent(1) + pos.Y);
-            var lineHeight = font.GetLineHeight(1);
-
-            foreach (var rune in str.EnumerateRunes())
-            {
-                if (rune == new Rune('\n'))
-                {
-                    baseLine.X = pos.X;
-                    baseLine.Y += lineHeight;
-                    advanceTotal.Y += lineHeight;
-                    continue;
-                }
-
-                var advance = font.DrawChar(this, rune, baseLine, 1, color);
-                advanceTotal.X += advance;
-                baseLine += new Vector2(advance, 0);
-            }
-
-            return advanceTotal;
-        }
+            => DrawString(font, pos, str, 1, color);
 
         /// <summary>
         ///     Draw a simple string to the screen at the specified position.
@@ -94,6 +73,30 @@ namespace Robust.Client.Graphics
         public Vector2 DrawString(Font font, Vector2 pos, string str)
             => DrawString(font, pos, str, Color.White);
 
+        public Vector2 DrawString(Font font, Vector2 pos, ReadOnlySpan<char> str, float scale, Color color)
+        {
+            var advanceTotal = Vector2.Zero;
+            var baseLine = new Vector2(pos.X, font.GetAscent(scale) + pos.Y);
+            var lineHeight = font.GetLineHeight(scale);
+
+            foreach (var rune in str.EnumerateRunes())
+            {
+                if (rune == new Rune('\n'))
+                {
+                    baseLine.X = pos.X;
+                    baseLine.Y += lineHeight;
+                    advanceTotal.Y += lineHeight;
+                    continue;
+                }
+
+                var advance = font.DrawChar(this, rune, baseLine, scale, color);
+                advanceTotal.X += advance;
+                baseLine += new Vector2(advance, 0);
+            }
+
+            return advanceTotal;
+        }
+
         public abstract void DrawEntity(EntityUid entity, Vector2 position, Vector2 scale, Direction? overrideDirection);
     }
 }

Robust.Client/Graphics/Overlays/Overlay.cs

@@ -98,7 +98,7 @@ namespace Robust.Client.Graphics
                 handle = renderHandle.DrawingHandleWorld;
             }
 
-            var args = new OverlayDrawArgs(currentSpace, vpControl, vp, handle, screenBox, worldBox, worldBounds);
+            var args = new OverlayDrawArgs(currentSpace, vpControl, vp, handle, screenBox, vp.Eye!.Position.MapId, worldBox, worldBounds);
 
             Draw(args);
         }

Robust.Client/Graphics/Overlays/OverlayDrawArgs.cs

@@ -1,6 +1,7 @@
 using JetBrains.Annotations;
 using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared.Enums;
+using Robust.Shared.Map;
 using Robust.Shared.Maths;
 
 namespace Robust.Client.Graphics
@@ -38,6 +39,11 @@ namespace Robust.Client.Graphics
         /// </summary>
         public readonly UIBox2i ViewportBounds;
 
+        /// <summary>
+        /// <see cref="MapId"/> of the viewport's eye.
+        /// </summary>
+        public readonly MapId MapId;
+
         /// <summary>
         ///     AABB enclosing the area visible in the viewport.
         /// </summary>
@@ -57,6 +63,7 @@ namespace Robust.Client.Graphics
             IClydeViewport viewport,
             DrawingHandleBase drawingHandle,
             in UIBox2i viewportBounds,
+            in MapId mapId,
             in Box2 worldAabb,
             in Box2Rotated worldBounds)
         {
@@ -65,6 +72,7 @@ namespace Robust.Client.Graphics
             Viewport = viewport;
             DrawingHandle = drawingHandle;
             ViewportBounds = viewportBounds;
+            MapId = mapId;
             WorldAABB = worldAabb;
             WorldBounds = worldBounds;
         }

Robust.Client/Graphics/Shaders/ParsedShader.cs

@@ -135,36 +135,42 @@ namespace Robust.Client.Graphics
 
     internal sealed class ShaderDataTypeFull
     {
-        public ShaderDataTypeFull(ShaderDataType type, ShaderPrecisionQualifier prec)
+        public ShaderDataTypeFull(ShaderDataType type, ShaderPrecisionQualifier prec, int? count = null)
         {
             Type = type;
             Precision = prec;
+            Count = count;
         }
 
         public ShaderDataType Type { get; }
         public ShaderPrecisionQualifier Precision { get; }
 
+        public int? Count;
+
+        public bool IsArray => Count != null;
+
         public string GetNativeType()
         {
-            if (Precision == ShaderPrecisionQualifier.Low)
+            string? precision = Precision switch
             {
-                return "lowp " + Type.GetNativeType();
-            }
-            else if (Precision == ShaderPrecisionQualifier.Medium)
-            {
-                return "mediump " + Type.GetNativeType();
-            }
-            else if (Precision == ShaderPrecisionQualifier.High)
-            {
-                return "highp " + Type.GetNativeType();
-            }
-            return Type.GetNativeType();
+                ShaderPrecisionQualifier.Low => "lowp ",
+                ShaderPrecisionQualifier.Medium => "mediump ",
+                ShaderPrecisionQualifier.High => "highp ",
+                _ => null,
+            };
+
+            return IsArray ? $"{precision}{Type.GetNativeType()}[{Count}]" : $"{precision}{Type.GetNativeType()}";
         }
 
         public bool TypePrecisionConsistent()
         {
             return Type.TypeHasPrecision() == (Precision != ShaderPrecisionQualifier.None);
         }
+
+        public bool TypeCountConsistent()
+        {
+            return Count == null || Type.TypeSupportsArrays();
+        }
     }
 
     internal static class ShaderEnumExt
@@ -195,6 +201,7 @@ namespace Robust.Client.Graphics
         {
             return
                 (type == ShaderDataType.Float) ||
+                (type == ShaderDataType.Int) ||
                 (type == ShaderDataType.Vec2) ||
                 (type == ShaderDataType.Vec3) ||
                 (type == ShaderDataType.Vec4) ||
@@ -203,6 +210,14 @@ namespace Robust.Client.Graphics
                 (type == ShaderDataType.Mat4);
         }
 
+        public static bool TypeSupportsArrays(this ShaderDataType type)
+        {
+            // TODO: add support for int, and vec3/4 arrays
+            return
+                (type == ShaderDataType.Float) ||
+                (type == ShaderDataType.Vec2);
+        }
+
         [SuppressMessage("ReSharper", "StringLiteralTypo")]
         private static readonly Dictionary<ShaderDataType, string> _nativeTypes = new()
         {

Robust.Client/Graphics/Shaders/ShaderInstance.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using Robust.Shared.Maths;
 
 namespace Robust.Client.Graphics
@@ -119,6 +119,13 @@ namespace Robust.Client.Graphics
             SetParameterImpl(name, value);
         }
 
+        public void SetParameter(string name, float[] value)
+        {
+            EnsureAlive();
+            EnsureMutable();
+            SetParameterImpl(name, value);
+        }
+
         public void SetParameter(string name, Vector2 value)
         {
             EnsureAlive();
@@ -126,6 +133,13 @@ namespace Robust.Client.Graphics
             SetParameterImpl(name, value);
         }
 
+        public void SetParameter(string name, Vector2[] value)
+        {
+            EnsureAlive();
+            EnsureMutable();
+            SetParameterImpl(name, value);
+        }
+
         public void SetParameter(string name, Vector3 value)
         {
             EnsureAlive();
@@ -244,7 +258,9 @@ namespace Robust.Client.Graphics
         private protected abstract ShaderInstance DuplicateImpl();
 
         private protected abstract void SetParameterImpl(string name, float value);
+        private protected abstract void SetParameterImpl(string name, float[] value);
         private protected abstract void SetParameterImpl(string name, Vector2 value);
+        private protected abstract void SetParameterImpl(string name, Vector2[] value);
         private protected abstract void SetParameterImpl(string name, Vector3 value);
         private protected abstract void SetParameterImpl(string name, Vector4 value);
         private protected abstract void SetParameterImpl(string name, Color value);

Robust.Client/Graphics/Shaders/ShaderParser.cs

@@ -504,17 +504,33 @@ namespace Robust.Client.Graphics
                     continue;
                 }
 
-                if (_shaderTypeMap.TryGetValue(wordType.Word, out var ret))
+                if (!_shaderTypeMap.TryGetValue(wordType.Word, out var ret))
+                    throw new ShaderParseException("Expected type", wordType.Position);
+
+                var result = new ShaderDataTypeFull(ret, precision);
+                if (!result.TypePrecisionConsistent())
                 {
-                    var result = new ShaderDataTypeFull(ret, precision);
-                    if (!result.TypePrecisionConsistent())
-                    {
-                        throw new ShaderParseException($"Type {ret} cannot accept precision {precision}", wordType.Position);
-                    }
-                    return result;
+                    throw new ShaderParseException($"Type {ret} cannot accept precision {precision}", wordType.Position);
                 }
 
-                throw new ShaderParseException("Expected type or precision", wordType.Position);
+                // is this type meant to be an array?
+                if (_peekToken() is TokenSymbol bracketOpen && bracketOpen.Symbol == Symbols.BracketOpen)
+                {
+                    _takeToken();
+                    if (_takeToken() is not TokenNumber number || !int.TryParse(number.Number, out var count))
+                        throw new ShaderParseException($"Failed to parse array length", bracketOpen.Position);
+
+                    if (_takeToken() is not TokenSymbol bracketClose || bracketClose.Symbol != Symbols.BracketClosed)
+                        throw new ShaderParseException($"Array length definition missing closing bracket", number.Position);
+
+                    result.Count = count;
+
+                    // are arrays supported by this type?
+                    if (!result.TypeCountConsistent())
+                        throw new ShaderParseException($"Type {ret} does not support arrays", wordType.Position);
+                }
+
+                return result;
             }
         }
 

Robust.Client/Graphics/Shaders/ShaderPrototype.cs

@@ -19,7 +19,7 @@ namespace Robust.Client.Graphics
         [Dependency] private readonly IResourceCache _resourceCache = default!;
 
         [ViewVariables]
-        [DataField("id", required: true)]
+        [IdDataFieldAttribute]
         public string ID { get; } = default!;
 
         private ShaderKind Kind;

Robust.Client/IGameController.cs

@@ -1,9 +1,19 @@
-namespace Robust.Client
-{
-    public interface IGameController
-    {
-        InitialLaunchState LaunchState { get; }
+namespace Robust.Client;
+
+public interface IGameController
+{
+    InitialLaunchState LaunchState { get; }
+
+    void Shutdown(string? reason=null);
+
+    /// <summary>
+    ///     Try to cause the launcher to either reconnect to the same server or connect to a new server.
+    ///     *The engine will shutdown on success.*
+    ///     Will throw an exception if contacting the launcher failed (success indicates it is now the launcher's responsibility).
+    ///     To redial the same server, retrieve the server's address from `LaunchState.Ss14Address`.
+    /// </summary>
+    /// <param name="address">The server address, such as "ss14://localhost:1212/".</param>
+    /// <param name="text">Informational text on the cause of the reconnect. Empty or null gives a default reason.</param>
+    void Redial(string address, string? text = null);
+}
 
-        void Shutdown(string? reason=null);
-    }
-}

Robust.Client/Input/InputManager.cs

@@ -497,7 +497,7 @@ namespace Robust.Client.Input
 
             if (robustMapping.TryGet("binds", out var BaseKeyRegsNode))
             {
-                var baseKeyRegs = serializationManager.ReadValueOrThrow<KeyBindingRegistration[]>(BaseKeyRegsNode);
+                var baseKeyRegs = serializationManager.Read<KeyBindingRegistration[]>(BaseKeyRegsNode);
 
                 foreach (var reg in baseKeyRegs)
                 {
@@ -526,7 +526,7 @@ namespace Robust.Client.Input
 
             if (userData && robustMapping.TryGet("leaveEmpty", out var node))
             {
-                var leaveEmpty = serializationManager.ReadValueOrThrow<BoundKeyFunction[]>(node);
+                var leaveEmpty = serializationManager.Read<BoundKeyFunction[]>(node);
 
                 if (leaveEmpty.Length > 0)
                 {

Robust.Client/Physics/GridFixtureSystem.cs

@@ -0,0 +1,134 @@
+using System;
+using System.Collections.Generic;
+using Robust.Client.Graphics;
+using Robust.Shared.Enums;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.Physics
+{
+    internal sealed class GridFixtureSystem : SharedGridFixtureSystem
+    {
+        public bool EnableDebug
+        {
+            get => _enableDebug;
+            set
+            {
+                if (_enableDebug == value) return;
+
+                _enableDebug = value;
+                var overlayManager = IoCManager.Resolve<IOverlayManager>();
+
+                if (_enableDebug)
+                {
+                    var overlay = new GridSplitNodeOverlay(EntityManager, IoCManager.Resolve<IMapManager>(), this);
+                    overlayManager.AddOverlay(overlay);
+                    RaiseNetworkEvent(new RequestGridNodesMessage());
+                }
+                else
+                {
+                    overlayManager.RemoveOverlay<GridSplitNodeOverlay>();
+                    RaiseNetworkEvent(new StopGridNodesMessage());
+                }
+            }
+        }
+
+        private bool _enableDebug = false;
+        private readonly Dictionary<EntityUid, Dictionary<Vector2i, List<List<Vector2i>>>> _nodes = new();
+        private readonly Dictionary<EntityUid, List<(Vector2, Vector2)>> _connections = new();
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeNetworkEvent<ChunkSplitDebugMessage>(OnDebugMessage);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+            _nodes.Clear();
+            _connections.Clear();
+        }
+
+        private void OnDebugMessage(ChunkSplitDebugMessage ev)
+        {
+            if (!_enableDebug) return;
+
+            _nodes[ev.Grid] = ev.Nodes;
+            _connections[ev.Grid] = ev.Connections;
+        }
+
+        private sealed class GridSplitNodeOverlay : Overlay
+        {
+            public override OverlaySpace Space => OverlaySpace.WorldSpace;
+
+            private IEntityManager _entManager;
+            private IMapManager _mapManager;
+            private GridFixtureSystem _system;
+
+            public GridSplitNodeOverlay(IEntityManager entManager, IMapManager mapManager, GridFixtureSystem system)
+            {
+                _entManager = entManager;
+                _mapManager = mapManager;
+                _system = system;
+            }
+
+            protected internal override void Draw(in OverlayDrawArgs args)
+            {
+                var worldHandle = args.WorldHandle;
+                var xformQuery = _entManager.GetEntityQuery<TransformComponent>();
+
+                foreach (var iGrid in _mapManager.FindGridsIntersecting(args.MapId, args.WorldBounds))
+                {
+                    // May not have received nodes yet.
+                    if (!_system._nodes.TryGetValue(iGrid.GridEntityId, out var nodes)) continue;
+
+                    var gridXform = xformQuery.GetComponent(iGrid.GridEntityId);
+                    worldHandle.SetTransform(gridXform.WorldMatrix);
+                    var grid = (MapGrid)iGrid;
+                    var chunkEnumerator = grid.GetMapChunks(args.WorldBounds);
+
+                    while (chunkEnumerator.MoveNext(out var chunk))
+                    {
+                        if (!nodes.TryGetValue(chunk.Indices, out var chunkNodes)) continue;
+
+                        for (var i = 0; i < chunkNodes.Count; i++)
+                        {
+                            var group = chunkNodes[i];
+                            var offset = chunk.Indices * chunk.ChunkSize;
+                            var color = GetColor(chunk, i);
+
+                            foreach (var index in group)
+                            {
+                                worldHandle.DrawRect(new Box2(offset + index, offset + index + 1).Enlarged(-0.1f), color);
+                            }
+                        }
+                    }
+
+                    var connections = _system._connections[iGrid.GridEntityId];
+
+                    foreach (var (start, end) in connections)
+                    {
+                        worldHandle.DrawLine(start, end, Color.Aquamarine);
+                    }
+                }
+            }
+
+            private Color GetColor(MapChunk chunk, int index)
+            {
+                // Just want something that doesn't give similar indices at 0,0 but is also deterministic.
+                // Add an offset to yIndex so we at least have some colour that isn't grey at 0,0
+                var actualIndex = chunk.Indices.X * 20 + (chunk.Indices.Y + 20) * 35 + index * 50;
+
+                var red = (byte) (actualIndex % 255);
+                var green = (byte) (actualIndex * 20 % 255);
+                var blue = (byte) (actualIndex * 30 % 255);
+
+                return new Color(red, green, blue, 85);
+            }
+        }
+    }
+}

Robust.Client/Physics/GridSplitVisualsCommand.cs

@@ -0,0 +1,18 @@
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Robust.Client.Physics;
+
+public sealed class GridSplitVisualCommand : IConsoleCommand
+{
+    public string Command => SharedGridFixtureSystem.ShowGridNodesCommand;
+    public string Description => "Shows the nodes for grid split purposes";
+    public string Help => $"{Command}";
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        var system = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<GridFixtureSystem>();
+        system.EnableDebug ^= true;
+        shell.WriteLine($"Toggled gridsplit node visuals");
+    }
+}

Robust.Client/Physics/PhysicsMapComponent.cs

@@ -49,7 +49,7 @@ namespace Robust.Client.Physics
             // Also need to suss out having the client build the island anyway and just... not solving it?
             foreach (var body in AwakeBodies)
             {
-                if (body.Island || body.LinearVelocity.Length > _linSleepTolerance / 2f || body.AngularVelocity > _angSleepTolerance / 2f) continue;
+                if (body.LinearVelocity.Length > _linSleepTolerance / 2f || body.AngularVelocity > _angSleepTolerance / 2f) continue;
                 body.SleepTime += frameTime;
                 if (body.SleepTime > _timeToSleep)
                 {

Robust.Client/Placement/PlacementManager.cs

@@ -418,7 +418,7 @@ namespace Robust.Client.Placement
             if (!IsActive || !Eraser) return;
             if (Hijack != null && Hijack.HijackDeletion(entity)) return;
 
-            var msg = NetworkManager.CreateNetMessage<MsgPlacement>();
+            var msg = new MsgPlacement();
             msg.PlaceType = PlacementManagerMessage.RequestEntRemove;
             msg.EntityUid = entity;
             NetworkManager.ClientSendMessage(msg);
@@ -426,7 +426,7 @@ namespace Robust.Client.Placement
 
         public void HandleRectDeletion(EntityCoordinates start, Box2 rect)
         {
-            var msg = NetworkManager.CreateNetMessage<MsgPlacement>();
+            var msg = new MsgPlacement();
             msg.PlaceType = PlacementManagerMessage.RequestRectRemove;
             msg.EntityCoordinates = new EntityCoordinates(StartPoint.EntityId, rect.BottomLeft);
             msg.RectSize = rect.Size;
@@ -748,7 +748,7 @@ namespace Robust.Client.Placement
                 _pendingTileChanges.Add(tuple);
             }
 
-            var message = NetworkManager.CreateNetMessage<MsgPlacement>();
+            var message = new MsgPlacement();
             message.PlaceType = PlacementManagerMessage.RequestPlacement;
 
             message.Align = CurrentMode.ModeName;

Robust.Client/Placement/PlacementMode.cs

@@ -170,10 +170,10 @@ namespace Robust.Client.Placement
         /// </summary>
         public TileRef GetTileRef(EntityCoordinates coordinates)
         {
-            var mapCoords = coordinates.ToMap(pManager.EntityManager);
             var gridId = coordinates.GetGridId(pManager.EntityManager);
+            var gridUid = coordinates.GetGridUid(pManager.EntityManager);
             return gridId.IsValid() ? pManager.MapManager.GetGrid(gridId).GetTileRef(MouseCoords)
-                : new TileRef(mapCoords.MapId, gridId,
+                : new TileRef(gridId, gridUid.GetValueOrDefault(),
                     MouseCoords.ToVector2i(pManager.EntityManager, pManager.MapManager), Tile.Empty);
         }
 

Robust.Client/Player/PlayerManager.cs

@@ -89,7 +89,7 @@ namespace Robust.Client.Player
         {
             LocalPlayer = new LocalPlayer();
 
-            var msgList = _network.CreateNetMessage<MsgPlayerListReq>();
+            var msgList = new MsgPlayerListReq();
             // message is empty
             _network.ClientSendMessage(msgList);
         }

Robust.Client/Profiling/LiveProfileViewControl.cs

@@ -0,0 +1,169 @@
+using Robust.Client.Graphics;
+using Robust.Client.ResourceManagement;
+using Robust.Client.UserInterface;
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
+using Robust.Shared.Profiling;
+
+namespace Robust.Client.Profiling;
+
+public sealed class LiveProfileViewControl : Control
+{
+    [Dependency] private readonly ProfManager _profManager = default!;
+    [Dependency] private readonly IResourceCache _resourceCache = default!;
+
+    public int MaxDepth { get; set; } = 2;
+
+    public LiveProfileViewControl()
+    {
+        IoCManager.InjectDependencies(this);
+    }
+
+    protected internal override void Draw(DrawingHandleScreen handle)
+    {
+        base.Draw(handle);
+
+        if (!_profManager.IsEnabled)
+            return;
+
+        var font = _resourceCache.GetResource<FontResource>("/Fonts/NotoSans/NotoSans-Regular.ttf").MakeDefault();
+        var baseLine = new Vector2(0, font.GetAscent(UIScale));
+
+        ref readonly var buffer = ref _profManager.Buffer;
+        ref readonly var index = ref buffer.Index(buffer.IndexWriteOffset - 1);
+
+        DrawData drawData = default;
+        drawData.Font = font;
+        drawData.Buffer = buffer;
+        drawData.Index = index;
+        drawData.Handle = handle;
+
+        var i = index.StartPos;
+
+        DrawCmds(in drawData, ref i, ref baseLine, 0);
+    }
+
+    private void DrawCmds(
+        in DrawData data,
+        ref long i,
+        ref Vector2 baseline,
+        int depth)
+    {
+        for (; i < data.Index.EndPos; i++)
+        {
+            ref var cmd = ref data.Buffer.Log(i);
+            DrawCmd(in data, ref i, ref baseline, depth, in cmd);
+        }
+    }
+
+    private void DrawCmdSample(
+        in DrawData data,
+        ref Vector2 baseline,
+        in ProfLogValue value)
+    {
+        DrawSample(in data, baseline, value.StringId, value.Value);
+
+        baseline += (0, data.Font.GetLineHeight(UIScale));
+    }
+
+    private void DrawSample(
+        in DrawData data,
+        Vector2 baseline,
+        int stringId,
+        in ProfValue value)
+    {
+        var cmdString = _profManager.GetString(stringId);
+        baseline += data.Handle.DrawString(data.Font, baseline, cmdString, UIScale, Color.White);
+        baseline += data.Handle.DrawString(data.Font, baseline, ": ", UIScale, Color.White);
+
+        var str = value.Type switch
+        {
+            ProfValueType.TimeAllocSample =>
+                $"{value.TimeAllocSample.Time * 1000:N2} ms, {value.TimeAllocSample.Alloc} B",
+            ProfValueType.Int32 => value.Int32.ToString(),
+            ProfValueType.Int64 => value.Int64.ToString(),
+            _ => "???"
+        };
+
+        data.Handle.DrawString(data.Font, baseline, str, UIScale, Color.White);
+    }
+
+    private void DrawCmd(
+        in DrawData data,
+        ref long i,
+        ref Vector2 baseline,
+        int depth,
+        in ProfLog log)
+    {
+        switch (log.Type)
+        {
+            case ProfLogType.Value:
+                DrawCmdSample(in data, ref baseline, in log.Value);
+                break;
+            case ProfLogType.GroupStart:
+                DrawEnterGroup(in data, ref i, ref baseline, depth);
+                break;
+        }
+    }
+
+    private void DrawEnterGroup(
+        in DrawData data,
+        ref long i,
+        ref Vector2 baseline,
+        int depth)
+    {
+        depth += 1;
+
+        var indentSize = 12 * UIScale;
+
+        var startBaseline = baseline;
+        baseline += (indentSize, data.Font.GetLineHeight(UIScale));
+
+        if (depth > MaxDepth)
+        {
+            var startIdx = i;
+
+            // Skip contents of this group.
+            for (; i < data.Index.EndPos; i++)
+            {
+                ref var cmd = ref data.Buffer.Log(i);
+                if (cmd.Type != ProfLogType.GroupEnd)
+                    continue;
+
+                if (cmd.GroupEnd.StartIndex <= startIdx)
+                    break;
+            }
+        }
+        else
+        {
+            i += 1;
+
+            for (; i < data.Index.EndPos; i++)
+            {
+                ref var cmd = ref data.Buffer.Log(i);
+                if (cmd.Type == ProfLogType.GroupEnd)
+                    break;
+
+                DrawCmd(in data, ref i, ref baseline, depth, in cmd);
+            }
+        }
+
+        // Gone through entire list = unmatched begin/end pair
+        if (i == data.Index.EndPos)
+            return;
+
+        ref var cmdEnd = ref data.Buffer.Log(i).GroupEnd;
+
+        baseline -= (indentSize, 0);
+
+        DrawSample(in data, startBaseline, cmdEnd.StringId, cmdEnd.Value);
+    }
+
+    private struct DrawData
+    {
+        public ProfBuffer Buffer;
+        public ProfIndex Index;
+        public Font Font;
+        public DrawingHandleScreen Handle;
+    }
+}

Robust.Client/Profiling/ProfViewManager.cs

@@ -0,0 +1,136 @@
+using System;
+using Robust.Shared.Console;
+using Robust.Shared.IoC;
+using Robust.Shared.Profiling;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility.Collections;
+
+namespace Robust.Client.Profiling;
+
+/// <summary>
+/// Manager for managing recording and snapshots of profiles, consuming shared <see cref="ProfManager"/>
+/// </summary>
+public sealed class ProfViewManager
+{
+    [Dependency]
+    private readonly ProfManager _profManager = default!;
+
+    public ValueList<Snapshot> Snapshots;
+
+    public event Action? SnapshotsUpdated;
+
+    private int _nextId = 1;
+
+    public void Snap()
+    {
+        var buffer = _profManager.Buffer.Snapshot();
+
+        var lowestIndex = CalcLowestIndex(buffer);
+        var highestIndex = buffer.IndexWriteOffset - 1;
+
+        long start;
+        long end;
+        if (lowestIndex == buffer.IndexWriteOffset)
+        {
+            // Literally not a single valid index. Time to give up.
+            start = 0;
+            end = 0;
+        }
+        else
+        {
+            (start, end) = CalcBufferRange(lowestIndex, highestIndex, buffer);
+        }
+
+        Snapshots.Add(new Snapshot
+        {
+            StartFrame = start,
+            EndFrame = end,
+            LowestValidIndex = lowestIndex,
+            Buffer = buffer,
+            Identifier = _nextId++
+        });
+
+        SnapshotsUpdated?.Invoke();
+    }
+
+    public void DeleteSnapshot(Snapshot snapshot)
+    {
+        if (Snapshots.Remove(snapshot))
+            SnapshotsUpdated?.Invoke();
+    }
+
+    private static long CalcLowestIndex(in ProfBuffer buffer)
+    {
+        // Any commands further back than this index are invalid.
+        // Indices in their range are thus also invalid and to be ignored.
+        var cmdBufferStartValid = buffer.LogWriteOffset - buffer.LogBuffer.LongLength;
+
+        // Just scan over the index ring buffer in reverse to find the earliest index that's still valid.
+        var min = buffer.IndexWriteOffset - buffer.IndexBuffer.LongLength;
+        for (var i = buffer.IndexWriteOffset - 1; i >= min; i--)
+        {
+            ref var index = ref buffer.Index(i);
+            if (index.StartPos < cmdBufferStartValid)
+                return i + 1;
+        }
+
+        return min;
+    }
+
+    private (long start, long end) CalcBufferRange(long lowestIndex, long highestIndex, in ProfBuffer buffer)
+    {
+        return (GetFrameOfIndex(lowestIndex, buffer), GetFrameOfIndex(highestIndex, buffer));
+    }
+
+    private long GetFrameOfIndex(long index, in ProfBuffer buffer)
+    {
+        ref var indexRef = ref buffer.Index(index);
+        ref var firstLog = ref buffer.Log(indexRef.StartPos);
+
+        if (firstLog.Type != ProfLogType.Value ||
+            _profManager.GetString(firstLog.Value.StringId) != GameLoop.ProfTextStartFrame)
+            throw new InvalidOperationException("Unable to find start frame");
+
+        if (firstLog.Value.Value.Type != ProfValueType.Int64)
+            throw new InvalidOperationException("Start frame has incorrect value type");
+
+        return firstLog.Value.Value.Int64;
+    }
+
+    public long GetIndexOfFrame(long frame, Snapshot snapshot)
+    {
+        for (var i = snapshot.Buffer.IndexWriteOffset - 1; i >= snapshot.LowestValidIndex; i--)
+        {
+            if (GetFrameOfIndex(i, snapshot.Buffer) == frame)
+                return i;
+        }
+
+        return 0;
+    }
+
+    public sealed class Snapshot
+    {
+        public int Identifier;
+
+        public long LowestValidIndex;
+        public long StartFrame;
+        public long EndFrame;
+        public ProfBuffer Buffer;
+
+        public long FrameCount => EndFrame - StartFrame + 1;
+    }
+}
+
+public sealed class ProfSnapshotCommand : IConsoleCommand
+{
+    // ReSharper disable once StringLiteralTypo
+    public string Command => "profsnap";
+    public string Description => "Make a profiling snapshot";
+    public string Help => "";
+
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        var profViewManager = IoCManager.Resolve<ProfViewManager>();
+        profViewManager.Snap();
+    }
+}

Robust.Client/Prototypes/ClientPrototypeManager.cs

@@ -57,7 +57,7 @@ namespace Robust.Client.Prototypes
 #if !FULL_RELEASE
             var sw = Stopwatch.StartNew();
 
-            var msg = _netManager.CreateNetMessage<MsgReloadPrototypes>();
+            var msg = new MsgReloadPrototypes();
             msg.Paths = _reloadQueue.ToArray();
             _netManager.ClientSendMessage(msg);
 

Robust.Client/ResourceManagement/ResourceTypes/RSIResource.cs

@@ -22,6 +22,8 @@ namespace Robust.Client.ResourceManagement
     {
         private static readonly float[] OneArray = {1};
 
+        public override ResourcePath? Fallback => new("/Textures/error.rsi");
+
         private static readonly JsonSerializerOptions SerializerOptions =
             new JsonSerializerOptions(JsonSerializerDefaults.Web)
             {

Robust.Client/Serialization/AppearanceVisualizerSerializer.cs

@@ -1,10 +1,10 @@
+using System;
 using Robust.Client.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Reflection;
 using Robust.Shared.Serialization;
 using Robust.Shared.Serialization.Manager;
 using Robust.Shared.Serialization.Manager.Attributes;
-using Robust.Shared.Serialization.Manager.Result;
 using Robust.Shared.Serialization.Markdown;
 using Robust.Shared.Serialization.Markdown.Mapping;
 using Robust.Shared.Serialization.Markdown.Validation;
@@ -16,26 +16,40 @@ namespace Robust.Client.Serialization
     [TypeSerializer]
     public sealed class AppearanceVisualizerSerializer : ITypeSerializer<AppearanceVisualizer, MappingDataNode>
     {
-        public DeserializationResult Read(ISerializationManager serializationManager, MappingDataNode node,
+        public AppearanceVisualizer Read(ISerializationManager serializationManager, MappingDataNode node,
             IDependencyCollection dependencies,
             bool skipHook,
-            ISerializationContext? context = null)
+            ISerializationContext? context = null, AppearanceVisualizer? value = null)
         {
+            Type? type = null;
             if (!node.TryGet("type", out var typeNode))
-                throw new InvalidMappingException("No type specified for AppearanceVisualizer!");
+            {
+                if (value == null)
+                    throw new InvalidMappingException("No type specified for AppearanceVisualizer!");
 
-            if (typeNode is not ValueDataNode typeValueDataNode)
-                throw new InvalidMappingException("Type node not a value node for AppearanceVisualizer!");
+                type = value.GetType();
+            }
+            else
+            {
+                if (typeNode is not ValueDataNode typeValueDataNode)
+                    throw new InvalidMappingException("Type node not a value node for AppearanceVisualizer!");
 
-            var type = IoCManager.Resolve<IReflectionManager>()
-                .YamlTypeTagLookup(typeof(AppearanceVisualizer), typeValueDataNode.Value);
-            if (type == null)
-                throw new InvalidMappingException(
-                    $"Invalid type {typeValueDataNode.Value} specified for AppearanceVisualizer!");
+                type = IoCManager.Resolve<IReflectionManager>()
+                    .YamlTypeTagLookup(typeof(AppearanceVisualizer), typeValueDataNode.Value);
+                if (type == null)
+                    throw new InvalidMappingException(
+                        $"Invalid type {typeValueDataNode.Value} specified for AppearanceVisualizer!");
+
+                if(value != null && !type.IsInstanceOfType(value))
+                {
+                    throw new InvalidMappingException(
+                        $"Specified Type does not match type of provided Value for AppearanceVisualizer! (TypeOfValue: {value.GetType()}, ProvidedValue: {type})");
+                }
+            }
 
             var newNode = node.Copy();
             newNode.Remove("type");
-            return serializationManager.Read(type, newNode, context, skipHook);
+            return (AppearanceVisualizer) serializationManager.Read(type, newNode, context, skipHook, value)!;
         }
 
         public ValidationNode Validate(ISerializationManager serializationManager, MappingDataNode node,

Robust.Client/UserInterface/Control.cs

@@ -847,13 +847,17 @@ namespace Robust.Client.UserInterface
             OnResized?.Invoke();
         }
 
-        internal void DoFrameUpdate(FrameEventArgs args)
+        internal int DoFrameUpdateRecursive(FrameEventArgs args)
         {
+            var total = 1;
             FrameUpdate(args);
+
             foreach (var child in Children)
             {
-                child.DoFrameUpdate(args);
+                total += child.DoFrameUpdateRecursive(args);
             }
+
+            return total;
         }
 
         /// <summary>

Robust.Client/UserInterface/Controls/ColorSelectorSliders.cs

@@ -0,0 +1,395 @@
+using System;
+using System.Collections.Generic;
+using Robust.Shared.Localization;
+using Robust.Shared.Maths;
+using Robust.Shared.Log;
+
+namespace Robust.Client.UserInterface.Controls;
+
+// condensed version of the original ColorSlider set
+public sealed class ColorSelectorSliders : Control
+{
+    public Color Color
+    {
+        get => _currentColor;
+        set
+        {
+            _updating = true;
+            _currentColor = value;
+
+            Update();
+            _updating = false;
+        }
+    }
+
+    public ColorSelectorType SelectorType
+    {
+        get => _currentType;
+        set
+        {
+            _updating = true;
+            _currentType = value;
+
+            UpdateType();
+            Update();
+            _updating = false;
+        }
+    }
+
+    public bool IsAlphaVisible
+    {
+        get => _isAlphaVisible;
+        set
+        {
+            _isAlphaVisible = value;
+
+            _alphaSliderBox.Visible = _isAlphaVisible;
+        }
+    }
+
+    public Action<Color>? OnColorChanged;
+
+    private bool _updating = false;
+    private Color _currentColor = Color.White;
+    private ColorSelectorType _currentType = ColorSelectorType.Rgb;
+    private bool _isAlphaVisible = false;
+
+    private ColorableSlider _topColorSlider;
+    private ColorableSlider _middleColorSlider;
+    private ColorableSlider _bottomColorSlider;
+    private Slider _alphaSlider;
+
+    private BoxContainer _alphaSliderBox = new();
+
+    private FloatSpinBox _topInputBox;
+    private FloatSpinBox _middleInputBox;
+    private FloatSpinBox _bottomInputBox;
+    private FloatSpinBox _alphaInputBox;
+
+    private Label _topSliderLabel = new();
+    private Label _middleSliderLabel = new();
+    private Label _bottomSliderLabel = new();
+    private Label _alphaSliderLabel = new();
+
+    private OptionButton _typeSelector;
+    private List<ColorSelectorType> _types = new();
+
+    public ColorSelectorSliders()
+    {
+        _topColorSlider = new ColorableSlider
+        {
+            HorizontalExpand = true,
+            VerticalAlignment = VAlignment.Center,
+            MaxValue = 1.0f
+        };
+
+        _middleColorSlider = new ColorableSlider
+        {
+            HorizontalExpand = true,
+            VerticalAlignment = VAlignment.Center,
+            MaxValue = 1.0f
+        };
+
+        _bottomColorSlider = new ColorableSlider
+        {
+            HorizontalExpand = true,
+            VerticalAlignment = VAlignment.Center,
+            MaxValue = 1.0f
+        };
+
+        _alphaSlider = new Slider
+        {
+            HorizontalExpand = true,
+            VerticalAlignment = VAlignment.Center,
+            MaxValue = 1.0f,
+        };
+
+        _topColorSlider.OnValueChanged += _ => { OnColorSet(); };
+        _middleColorSlider.OnValueChanged += _ => { OnColorSet(); };
+        _bottomColorSlider.OnValueChanged += _ => { OnColorSet(); };
+        _alphaSlider.OnValueChanged += _ => { OnColorSet(); };
+
+        _topInputBox = new FloatSpinBox(1f, 2)
+        {
+            IsValid = value => IsSpinBoxValid(value, ColorSliderOrder.Top)
+        };
+
+        _middleInputBox = new FloatSpinBox(1f, 2)
+        {
+            IsValid = value => IsSpinBoxValid(value, ColorSliderOrder.Middle)
+        };
+
+        _bottomInputBox = new FloatSpinBox(1f, 2)
+        {
+            IsValid = value => IsSpinBoxValid(value, ColorSliderOrder.Bottom)
+        };
+
+        _alphaInputBox = new FloatSpinBox(1f, 2)
+        {
+            IsValid = value => IsSpinBoxValid(value, ColorSliderOrder.Alpha)
+        };
+
+        _topInputBox.OnValueChanged += value =>
+        {
+            _topColorSlider.Value = value.Value / GetColorValueDivisor(ColorSliderOrder.Top);
+        };
+
+        _middleInputBox.OnValueChanged += value =>
+        {
+            _middleColorSlider.Value = value.Value / GetColorValueDivisor(ColorSliderOrder.Middle);
+        };
+
+        _bottomInputBox.OnValueChanged += value =>
+        {
+            _bottomColorSlider.Value = value.Value / GetColorValueDivisor(ColorSliderOrder.Bottom);
+        };
+
+        _alphaInputBox.OnValueChanged += value =>
+        {
+            _alphaSlider.Value = value.Value / GetColorValueDivisor(ColorSliderOrder.Alpha);
+        };
+
+        _alphaSliderLabel.Text = Loc.GetString("color-selector-sliders-alpha");
+
+        _typeSelector = new OptionButton();
+        foreach (var ty in Enum.GetValues<ColorSelectorType>())
+        {
+            _typeSelector.AddItem(Loc.GetString($"color-selector-sliders-{ty.ToString().ToLower()}"));
+            _types.Add(ty);
+        }
+
+        _typeSelector.OnItemSelected += args =>
+        {
+            SelectorType = _types[args.Id];
+            _typeSelector.Select(args.Id);
+        };
+
+        // TODO: Maybe some engine widgets could be laid out in XAML?
+
+        var rootBox = new BoxContainer
+        {
+            Orientation = BoxContainer.LayoutOrientation.Vertical
+        };
+        AddChild(rootBox);
+
+        var headerBox = new BoxContainer();
+        rootBox.AddChild(headerBox);
+
+        headerBox.AddChild(_typeSelector);
+
+        var bodyBox = new BoxContainer()
+        {
+            Orientation = BoxContainer.LayoutOrientation.Vertical
+        };
+
+        // pita
+        var topSliderBox = new BoxContainer();
+
+        topSliderBox.AddChild(_topSliderLabel);
+        topSliderBox.AddChild(_topColorSlider);
+        topSliderBox.AddChild(_topInputBox);
+
+        var middleSliderBox = new BoxContainer();
+
+        middleSliderBox.AddChild(_middleSliderLabel);
+        middleSliderBox.AddChild(_middleColorSlider);
+        middleSliderBox.AddChild(_middleInputBox);
+
+        var bottomSliderBox = new BoxContainer();
+
+        bottomSliderBox.AddChild(_bottomSliderLabel);
+        bottomSliderBox.AddChild(_bottomColorSlider);
+        bottomSliderBox.AddChild(_bottomInputBox);
+
+        _alphaSliderBox.Visible = IsAlphaVisible;
+        _alphaSliderBox.AddChild(_alphaSliderLabel);
+        _alphaSliderBox.AddChild(_alphaSlider);
+        _alphaSliderBox.AddChild(_alphaInputBox);
+
+        bodyBox.AddChild(topSliderBox);
+        bodyBox.AddChild(middleSliderBox);
+        bodyBox.AddChild(bottomSliderBox);
+        bodyBox.AddChild(_alphaSliderBox);
+
+        rootBox.AddChild(bodyBox);
+
+        _updating = true;
+        UpdateType();
+        Update();
+        _updating = false;
+    }
+
+    private void UpdateType()
+    {
+        (string topLabel, string middleLabel, string bottomLabel) labels = GetSliderLabels();
+
+        _topSliderLabel.Text = labels.topLabel;
+        _middleSliderLabel.Text = labels.middleLabel;
+        _bottomSliderLabel.Text = labels.bottomLabel;
+    }
+
+    private void Update()
+    {
+        _topColorSlider.SetColor(_currentColor);
+        _middleColorSlider.SetColor(_currentColor);
+        _bottomColorSlider.SetColor(_currentColor);
+
+        switch (SelectorType)
+        {
+            case ColorSelectorType.Rgb:
+                _topColorSlider.Value = Color.R;
+                _middleColorSlider.Value = Color.G;
+                _bottomColorSlider.Value = Color.B;
+
+                _topInputBox.Value = Color.R * 255.0f;
+                _middleInputBox.Value = Color.G * 255.0f;
+                _bottomInputBox.Value = Color.B * 255.0f;
+
+                break;
+            case ColorSelectorType.Hsv:
+                Vector4 color = Color.ToHsv(Color);
+
+                // dumb workaround because the formula for
+                // HSV calculation results in a negative
+                // number in any value past 300 degrees
+                if (color.X > 0)
+                {
+                    _topColorSlider.Value = color.X;
+                    _topInputBox.Value = color.X * 360.0f;
+                }
+                else
+                {
+                    _topInputBox.Value = _topColorSlider.Value * 360.0f;
+                }
+
+                _middleColorSlider.Value = color.Y;
+                _bottomColorSlider.Value = color.Z;
+
+                _middleInputBox.Value = color.Y * 100.0f;
+                _bottomInputBox.Value = color.Z * 100.0f;
+
+
+                break;
+        }
+
+        _alphaSlider.Value = Color.A;
+        _alphaInputBox.Value = Color.A * 100.0f;
+    }
+
+    private bool IsSpinBoxValid(float value, ColorSliderOrder ordering)
+    {
+        if (value < 0)
+        {
+            return false;
+        }
+
+        if (ordering == ColorSliderOrder.Alpha)
+        {
+            return value <= 100.0f;
+        }
+
+        switch (SelectorType)
+        {
+            case ColorSelectorType.Rgb:
+                return value <= byte.MaxValue;
+            case ColorSelectorType.Hsv:
+                switch (ordering)
+                {
+                    case ColorSliderOrder.Top:
+                        return value <= 360.0f;
+                    default:
+                        return value <= 100.0f;
+                }
+        }
+
+        return false;
+    }
+
+    private (string, string, string) GetSliderLabels()
+    {
+        switch (SelectorType)
+        {
+            case ColorSelectorType.Rgb:
+                return (
+                    Loc.GetString("color-selector-sliders-red"),
+                    Loc.GetString("color-selector-sliders-green"),
+                    Loc.GetString("color-selector-sliders-blue")
+                );
+            case ColorSelectorType.Hsv:
+                return (
+                    Loc.GetString("color-selector-sliders-hue"),
+                    Loc.GetString("color-selector-sliders-saturation"),
+                    Loc.GetString("color-selector-sliders-value")
+                );
+        }
+
+        return ("ERR", "ERR", "ERR");
+    }
+
+    private float GetColorValueDivisor(ColorSliderOrder order)
+    {
+        if (order == ColorSliderOrder.Alpha)
+        {
+            return 100.0f;
+        }
+
+        switch (SelectorType)
+        {
+            case ColorSelectorType.Rgb:
+                return 255.0f;
+            case ColorSelectorType.Hsv:
+                switch (order)
+                {
+                    case ColorSliderOrder.Top:
+                        return 360.0f;
+                    default:
+                        return 100.0f;
+                }
+        }
+
+        return 0.0f;
+    }
+
+    private void OnColorSet()
+    {
+        // stack overflow otherwise due to value sets
+        if (_updating)
+        {
+            return;
+        }
+
+        switch (SelectorType)
+        {
+            case ColorSelectorType.Rgb:
+                Color rgbColor = new Color(_topColorSlider.Value, _middleColorSlider.Value, _bottomColorSlider.Value, _alphaSlider.Value);
+
+                _currentColor = rgbColor;
+                Update();
+
+                OnColorChanged!(rgbColor);
+                break;
+            case ColorSelectorType.Hsv:
+                Color hsvColor = Color.FromHsv(new Vector4(_topColorSlider.Value, _middleColorSlider.Value, _bottomColorSlider.Value, _alphaSlider.Value));
+
+                _currentColor = hsvColor;
+                Update();
+
+                OnColorChanged!(hsvColor);
+                break;
+        }
+    }
+
+    private enum ColorSliderOrder
+    {
+        Top,
+        Middle,
+        Bottom,
+        Alpha
+    }
+
+    public enum ColorSelectorType
+    {
+        Rgb,
+        Hsv,
+    }
+}

Robust.Client/UserInterface/Controls/ColorableSlider.cs

@@ -0,0 +1,81 @@
+using Robust.Client.Graphics;
+using Robust.Shared.Maths;
+using Robust.Shared.Log;
+
+namespace Robust.Client.UserInterface.Controls;
+
+public sealed class ColorableSlider : Slider
+{
+    public const string StylePropertyFillWhite = "fillWhite"; // needs to be filled with white
+    public const string StylePropertyBackgroundWhite = "backgroundWhite"; // also needs to be filled with white
+
+    public Color Color { get; private set; } = Color.White;
+    public PartSelector Part
+    {
+        get => _currentPartSelector;
+        set
+        {
+            _currentPartSelector = value;
+
+            UpdateStyleBoxes();
+        }
+    }
+
+    private PartSelector _currentPartSelector = PartSelector.Background;
+
+    public void SetColor(Color color)
+    {
+        Color = color;
+        switch (Part)
+        {
+            case PartSelector.Fill:
+                _fillPanel.Modulate = Color;
+                break;
+            case PartSelector.Background:
+                _backgroundPanel.Modulate = Color;
+                break;
+        }
+    }
+
+    protected override void UpdateStyleBoxes()
+    {
+        StyleBox? GetStyleBox(string name)
+        {
+            if (TryGetStyleProperty<StyleBox>(name, out var box))
+            {
+                return box;
+            }
+
+            return null;
+        }
+
+        string backBox = StylePropertyBackground;
+        string fillBox = StylePropertyFill;
+
+        switch (Part)
+        {
+            case PartSelector.Fill:
+                fillBox = StylePropertyFillWhite;
+                _fillPanel.Modulate = Color;
+
+                break;
+            case PartSelector.Background:
+                backBox = StylePropertyBackgroundWhite;
+
+                _fillPanel.Modulate = Color.Transparent; // make this transparent
+                _backgroundPanel.Modulate = Color;
+                break;
+        }
+
+        _backgroundPanel.PanelOverride = BackgroundStyleBoxOverride ?? GetStyleBox(backBox);
+        _foregroundPanel.PanelOverride = ForegroundStyleBoxOverride ?? GetStyleBox(StylePropertyForeground);
+        _fillPanel.PanelOverride = FillStyleBoxOverride ?? GetStyleBox(fillBox);
+        _grabber.PanelOverride = GrabberStyleBoxOverride ?? GetStyleBox(StylePropertyGrabber);
+    }
+
+    public enum PartSelector
+    {
+        Fill,
+        Background
+    }
+}

Robust.Client/UserInterface/Controls/LineEdit.cs

@@ -65,18 +65,22 @@ namespace Robust.Client.UserInterface.Controls
             get => _text;
             set
             {
-                if (value == null)
-                {
-                    value = "";
-                }
+                // Save cursor position or -1 for end
+                var cursorTarget = CursorPosition == _text.Length ? -1 : CursorPosition;
 
-                if (!SetText(value))
+                if (!InternalSetText(value))
                 {
                     return;
                 }
 
-                _cursorPosition = 0;
-                _selectionStart = 0;
+                var clamped = MathHelper.Clamp(cursorTarget == -1 ? _text.Length : cursorTarget, 0, _text.Length);
+                while (clamped < _text.Length && !Rune.TryGetRuneAt(_text, clamped, out _))
+                {
+                    clamped++;
+                }
+
+                _cursorPosition = clamped;
+                _selectionStart = _cursorPosition;
                 _updatePseudoClass();
             }
         }
@@ -203,7 +207,7 @@ namespace Robust.Client.UserInterface.Controls
             var lower = SelectionLower;
             var newContents = Text[..lower] + text + Text[SelectionUpper..];
 
-            if (!SetText(newContents))
+            if (!InternalSetText(newContents))
             {
                 return;
             }
@@ -216,7 +220,7 @@ namespace Robust.Client.UserInterface.Controls
         /// <remarks>
         /// Does not fix cursor positions, those will have to be adjusted manually.
         /// </remarks>>
-        protected bool SetText(string newText)
+        private bool InternalSetText(string newText)
         {
             if (IsValid != null && !IsValid(newText))
             {

Robust.Client/UserInterface/Controls/Slider.cs

@@ -13,10 +13,10 @@ namespace Robust.Client.UserInterface.Controls
         public const string StylePropertyFill = "fill";
         public const string StylePropertyGrabber = "grabber";
 
-        private readonly PanelContainer _foregroundPanel;
-        private readonly PanelContainer _backgroundPanel;
-        private readonly PanelContainer _fillPanel;
-        private readonly PanelContainer _grabber;
+        protected readonly PanelContainer _foregroundPanel;
+        protected readonly PanelContainer _backgroundPanel;
+        protected readonly PanelContainer _fillPanel;
+        protected readonly PanelContainer _grabber;
 
         private bool _grabbed;
 
@@ -169,7 +169,7 @@ namespace Robust.Client.UserInterface.Controls
             UpdateStyleBoxes();
         }
 
-        private void UpdateStyleBoxes()
+        protected virtual void UpdateStyleBoxes()
         {
             StyleBox? GetStyleBox(string name)
             {
@@ -182,7 +182,7 @@ namespace Robust.Client.UserInterface.Controls
             }
 
             _backgroundPanel.PanelOverride = BackgroundStyleBoxOverride ?? GetStyleBox(StylePropertyBackground);
-            _foregroundPanel.PanelOverride = BackgroundStyleBoxOverride ?? GetStyleBox(StylePropertyForeground);
+            _foregroundPanel.PanelOverride = ForegroundStyleBoxOverride ?? GetStyleBox(StylePropertyForeground);
             _fillPanel.PanelOverride = FillStyleBoxOverride ?? GetStyleBox(StylePropertyFill);
             _grabber.PanelOverride = GrabberStyleBoxOverride ?? GetStyleBox(StylePropertyGrabber);
         }

Robust.Client/UserInterface/CustomControls/DebugCoordsPanel.cs

@@ -73,7 +73,7 @@ namespace Robust.Client.UserInterface.CustomControls
             {
                 mouseGridPos = new EntityCoordinates(_mapManager.GetMapEntityId(mouseWorldMap.MapId),
                     mouseWorldMap.Position);
-                tile = new TileRef(mouseWorldMap.MapId, GridId.Invalid,
+                tile = new TileRef(GridId.Invalid, EntityUid.Invalid,
                     mouseGridPos.ToVector2i(_entityManager, _mapManager), Tile.Empty);
             }
 

Robust.Client/UserInterface/CustomControls/DebugMonitors.cs

@@ -2,6 +2,7 @@
 using Robust.Client.Graphics;
 using Robust.Client.Input;
 using Robust.Client.Player;
+using Robust.Client.Profiling;
 using Robust.Client.State;
 using Robust.Client.UserInterface.Controls;
 using Robust.Shared.Configuration;
@@ -72,6 +73,8 @@ namespace Robust.Client.UserInterface.CustomControls
             {
                 HorizontalAlignment = HAlignment.Left
             });
+
+            AddChild(new LiveProfileViewControl());
         }
     }
 }

Robust.Client/UserInterface/CustomControls/EntitySpawnWindow.cs

@@ -228,7 +228,7 @@ namespace Robust.Client.UserInterface.CustomControls
 
             foreach (var prototype in prototypeManager.EnumeratePrototypes<EntityPrototype>())
             {
-                if (prototype.Abstract)
+                if (prototype.NoSpawn || prototype.Abstract)
                 {
                     continue;
                 }

Robust.Client/UserInterface/CustomControls/FrameGraph.cs

@@ -86,20 +86,7 @@ namespace Robust.Client.UserInterface.CustomControls
                 var x = FrameWidth * UIScale * (TrackedFrames - 1 - i);
                 var rect = new UIBox2(x, PixelHeight - (frameHeight * ratio), x + FrameWidth * UIScale, PixelHeight);
 
-                Color color;
-                if (frameTime > 1f / (target / 2 - 1))
-                {
-                    color = Color.Red;
-                }
-                else if (frameTime > 1f / (target - 1))
-                {
-                    color = Color.Yellow;
-                }
-                else
-                {
-                    color = Color.Lime;
-                }
-                handle.DrawRect(rect, color);
+                handle.DrawRect(rect, FrameTimeColor(frameTime, target));
 
                 var gc = _gcMarkers[currentFrameIndex];
                 if (gc)
@@ -112,5 +99,16 @@ namespace Robust.Client.UserInterface.CustomControls
                 }
             }
         }
+
+        internal static Color FrameTimeColor(float time, int target)
+        {
+            if (time > 1f / (target / 2 - 1))
+                return Color.Red;
+
+            if (time > 1f / (target - 1))
+                return Color.Yellow;
+
+            return Color.Lime;
+        }
     }
 }

Robust.Client/UserInterface/DevWindow/DevWindow.xaml

@@ -4,5 +4,6 @@
     <TabContainer>
         <DebugConsole Name="DebugConsole" />
         <DevWindowTabUI Name="UI" />
+        <DevWindowTabPerf Name="Perf" />
     </TabContainer>
 </Control>

Robust.Client/UserInterface/DevWindow/DevWindow.xaml.cs

@@ -23,6 +23,7 @@ namespace Robust.Client.UserInterface
 
             TabContainer.SetTabTitle(DebugConsole, "Debug Console");
             TabContainer.SetTabTitle(UI, "User Interface");
+            TabContainer.SetTabTitle(Perf, "Profiling");
         }
     }
 
@@ -45,9 +46,9 @@ namespace Robust.Client.UserInterface
 
             var window = clyde.CreateWindow(new WindowCreateParameters
             {
-                Maximized = true,
+                //Maximized = true,
                 Title = "Robust Debug Window",
-                Monitor = monitor,
+                //Monitor = monitor,
             });
             var root = IoCManager.Resolve<IUserInterfaceManager>().CreateWindowRoot(window);
             window.DisposeOnClose = true;

Robust.Client/UserInterface/DevWindow/DevWindowTabPerf.xaml

@@ -0,0 +1,41 @@
+<Control xmlns="https://spacestation14.io"
+         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+         x:Class="Robust.Client.UserInterface.DevWindowTabPerf">
+    <SplitContainer Orientation="Horizontal">
+        <!-- Snapshot list and settings overview -->
+        <BoxContainer Orientation="Vertical" Margin="2" MinWidth="250">
+            <Label Text="Snapshot list" Margin="0 0 0 4" />
+            <BoxContainer Orientation="Horizontal" Margin="0 0 0 4">
+                <Button Text="Snap" Name="SnapButton" />
+            </BoxContainer>
+            <ScrollContainer HScrollEnabled="False" VScrollEnabled="True"
+                             VerticalExpand="True">
+                <BoxContainer Orientation="Vertical" Name="SnapList" />
+            </ScrollContainer>
+
+            <!-- Settings overview -->
+            <ProfSettings />
+        </BoxContainer>
+
+        <!-- Main right panel -->
+        <Control Margin="2">
+            <BoxContainer Orientation="Vertical">
+                <Label Text="Snapshot view"></Label>
+
+                <Control VerticalExpand="True">
+                    <Label Text="Make a snapshot on the left to get started"
+                           HorizontalAlignment="Center" VerticalAlignment="Center"
+                           Name="RightPanelPlaceholder" />
+                    <BoxContainer Orientation="Vertical" Name="RightPanel" Visible="False">
+                        <BoxContainer Orientation="Horizontal">
+                            <Label Name="LabelTopText" HorizontalExpand="True" />
+                            <Button Name="ButtonDeleteSnap" Text="Delete snapshot" />
+                        </BoxContainer>
+                        <ProfGraphView Name="GraphView" MinHeight="96" MouseFilter="Stop" Margin="0 4" />
+                        <ProfTree Name="Tree" VerticalExpand="True" />
+                    </BoxContainer>
+                </Control>
+            </BoxContainer>
+        </Control>
+    </SplitContainer>
+</Control>

Robust.Client/UserInterface/DevWindow/DevWindowTabPerf.xaml.cs

@@ -0,0 +1,115 @@
+using Robust.Client.AutoGenerated;
+using Robust.Client.Profiling;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.IoC;
+
+namespace Robust.Client.UserInterface;
+
+[GenerateTypedNameReferences]
+public sealed partial class DevWindowTabPerf : Control
+{
+    [Dependency] private readonly ProfViewManager _profViewMgr = default!;
+
+    private ProfViewManager.Snapshot? _currentSnapshot;
+
+    public DevWindowTabPerf()
+    {
+        RobustXamlLoader.Load(this);
+        IoCManager.InjectDependencies(this);
+
+        SnapButton.OnPressed += SnapButtonOnOnPressed;
+        ButtonDeleteSnap.OnPressed += ButtonDeleteSnapOnOnPressed;
+        GraphView.FrameSelected += SelectFrame;
+    }
+
+    private void SelectFrame(long obj)
+    {
+        if (_currentSnapshot == null)
+            return;
+
+        GraphView.HighlightFrame = obj;
+        Tree.Frame = obj;
+        Tree.RebuildTree();
+    }
+
+    protected override void EnteredTree()
+    {
+        _profViewMgr.SnapshotsUpdated += ProfViewMgrOnSnapshotsUpdated;
+
+        UpdateSnapshotList();
+    }
+
+    protected override void ExitedTree()
+    {
+        _profViewMgr.SnapshotsUpdated -= ProfViewMgrOnSnapshotsUpdated;
+    }
+
+    private void ProfViewMgrOnSnapshotsUpdated()
+    {
+        UpdateSnapshotList();
+    }
+
+    private void SnapButtonOnOnPressed(BaseButton.ButtonEventArgs obj)
+    {
+        _profViewMgr.Snap();
+        SnapshotSelected(_profViewMgr.Snapshots[^1]);
+    }
+
+    private void ButtonDeleteSnapOnOnPressed(BaseButton.ButtonEventArgs obj)
+    {
+        if (_currentSnapshot == null)
+            return;
+
+        _profViewMgr.DeleteSnapshot(_currentSnapshot);
+        _currentSnapshot = null;
+        UpdateRightPanel();
+    }
+
+    private void UpdateSnapshotList()
+    {
+        SnapList.RemoveAllChildren();
+
+        for (var i = _profViewMgr.Snapshots.Count - 1; i >= 0; i--)
+        {
+            var snap = _profViewMgr.Snapshots[i];
+
+            var button = new Button
+            {
+                Text = $"{snap.Identifier}: {snap.StartFrame} - {snap.EndFrame}",
+                ToggleMode = true
+            };
+
+            if (snap == _currentSnapshot)
+                button.Pressed = true;
+
+            button.OnPressed += _ => SnapshotSelected(snap);
+
+            SnapList.AddChild(button);
+        }
+    }
+
+    private void SnapshotSelected(ProfViewManager.Snapshot snapshot)
+    {
+        _currentSnapshot = snapshot;
+        UpdateSnapshotList();
+        UpdateRightPanel();
+        SelectFrame(_currentSnapshot.EndFrame);
+        Tree.RebuildTree();
+    }
+
+    private void UpdateRightPanel()
+    {
+        RightPanel.Visible = _currentSnapshot != null;
+        RightPanelPlaceholder.Visible = _currentSnapshot == null;
+
+        if (_currentSnapshot == null)
+            return;
+
+        LabelTopText.Text =
+            $"Snapshot: {_currentSnapshot.StartFrame} - {_currentSnapshot.EndFrame}  Frame count: {_currentSnapshot.FrameCount}";
+
+        GraphView.LoadSnapshot(_currentSnapshot);
+        Tree.LoadSnapshot(_currentSnapshot);
+    }
+}

Robust.Client/UserInterface/DevWindow/ExpanderArrow.cs

@@ -0,0 +1,32 @@
+using System;
+using Robust.Client.Graphics;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.UserInterface;
+
+internal sealed class ExpanderArrow : Control
+{
+    public bool Rotated { get; set; }
+
+    protected internal override void Draw(DrawingHandleScreen handle)
+    {
+        Span<Vector2> triangle = stackalloc Vector2[3];
+        triangle[0] = (0.8f, 0f);
+        triangle[1] = (-0.8f, 1f);
+        triangle[2] = (-0.8f, -1f);
+
+        foreach (ref var t in triangle)
+        {
+            if (Rotated)
+            {
+                t = Angle.FromDegrees(90).RotateVec(t);
+            }
+
+            t /= 2;
+            t += 0.5f;
+            t *= PixelSize;
+        }
+
+        handle.DrawPrimitives(DrawPrimitiveTopology.TriangleList, triangle, Color.White);
+    }
+}

Robust.Client/UserInterface/DevWindow/ProfAltBackground.cs

@@ -0,0 +1,15 @@
+using Robust.Client.Graphics;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.UserInterface;
+
+internal sealed class ProfAltBackground : Control
+{
+    public bool IsAltBackground { get; set; }
+
+    protected internal override void Draw(DrawingHandleScreen handle)
+    {
+        if (IsAltBackground)
+            handle.DrawRect(PixelSizeBox, new Color(0, 0, 0, 128));
+    }
+}

Robust.Client/UserInterface/DevWindow/ProfGraphView.cs

@@ -0,0 +1,123 @@
+using System;
+using Robust.Client.Graphics;
+using Robust.Client.Profiling;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Shared;
+using Robust.Shared.Configuration;
+using Robust.Shared.Input;
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
+using Robust.Shared.Profiling;
+
+namespace Robust.Client.UserInterface;
+
+internal sealed class ProfGraphView : Control
+{
+    private const int HeightFps = 15;
+    private const float MaxHeightMs = 1 / (float) HeightFps;
+
+    [Dependency] private readonly IConfigurationManager _cfg = default!;
+
+    private ProfViewManager.Snapshot? _snapshot;
+
+    public event Action<long>? FrameSelected;
+
+    private bool _dragging;
+
+    public long HighlightFrame;
+
+    public ProfGraphView()
+    {
+        RectClipContent = true;
+
+        IoCManager.InjectDependencies(this);
+    }
+
+    public void LoadSnapshot(ProfViewManager.Snapshot snapshot)
+    {
+        _snapshot = snapshot;
+    }
+
+    protected internal override void KeyBindDown(GUIBoundKeyEventArgs args)
+    {
+        if (args.Function != EngineKeyFunctions.UIClick)
+            return;
+
+        _dragging = true;
+        args.Handle();
+        DoFrameSelect(args.RelativePosition);
+    }
+
+    protected internal override void MouseMove(GUIMouseMoveEventArgs args)
+    {
+        if (!_dragging)
+            return;
+
+        DoFrameSelect(args.RelativePosition);
+    }
+
+    protected internal override void KeyBindUp(GUIBoundKeyEventArgs args)
+    {
+        if (args.Function != EngineKeyFunctions.UIClick)
+            return;
+
+        args.Handle();
+        _dragging = false;
+    }
+
+    private void DoFrameSelect(Vector2 pos)
+    {
+        if (_snapshot == null)
+            return;
+
+        var trackedFrameCount = _snapshot.EndFrame - _snapshot.StartFrame + 1;
+        var frame = MathHelper.Clamp((int)(pos.X / Width * trackedFrameCount), 0, trackedFrameCount-1);
+
+        FrameSelected?.Invoke(frame + _snapshot.StartFrame);
+    }
+
+    protected internal override void Draw(DrawingHandleScreen handle)
+    {
+        if (_snapshot == null)
+            return;
+
+        var targetFps = _cfg.GetCVar(CVars.DebugTargetFps);
+
+        var trackedFrameCount = _snapshot.EndFrame - _snapshot.StartFrame + 1;
+
+        ref var buffer = ref _snapshot.Buffer;
+
+        var barWidth = PixelWidth / (float) trackedFrameCount;
+        var x = PixelWidth - barWidth;
+        var controlHeight = PixelHeight;
+
+        var frame = _snapshot.EndFrame;
+
+        for (var i = _snapshot.Buffer.IndexWriteOffset - 1; i >= _snapshot.LowestValidIndex; i--)
+        {
+            var valueSeconds = GetFrameTime(buffer, buffer.Index(i)).Time;
+
+            var height = controlHeight * (valueSeconds / MaxHeightMs);
+
+            var rect = UIBox2.FromDimensions(x, (controlHeight - height), barWidth, height);
+            var color = HighlightFrame == frame ? Color.Pink : FrameGraph.FrameTimeColor(valueSeconds, targetFps);
+            handle.DrawRect(rect, color);
+
+            x -= barWidth;
+
+            frame -= 1;
+        }
+    }
+
+    internal static TimeAndAllocSample GetFrameTime(in ProfBuffer buffer, in ProfIndex index)
+    {
+        var endPos = index.EndPos;
+
+        ref var endGroup = ref buffer.Log(endPos - 1);
+        if (endGroup.Type != ProfLogType.GroupEnd ||
+            endGroup.GroupEnd.Value.Type != ProfValueType.TimeAllocSample)
+            return default;
+
+        return endGroup.GroupEnd.Value.TimeAllocSample;
+    }
+}

Robust.Client/UserInterface/DevWindow/ProfSettings.xaml

@@ -0,0 +1,18 @@
+<Control xmlns="https://spacestation14.io"
+         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+         x:Class="Robust.Client.UserInterface.ProfSettings">
+    <BoxContainer Orientation="Vertical">
+        <BoxContainer Orientation="Horizontal" SeparationOverride="8">
+            <Label Text="enabled" HorizontalExpand="True" />
+            <CheckBox Name="SettingEnabled" Disabled="True" />
+        </BoxContainer>
+        <BoxContainer Orientation="Horizontal" SeparationOverride="8">
+            <Label Text="buffer_size" HorizontalExpand="True" />
+            <Label Name="SettingBufferSize" />
+        </BoxContainer>
+        <BoxContainer Orientation="Horizontal" SeparationOverride="8">
+            <Label Text="index_size" HorizontalExpand="True" />
+            <Label Name="SettingIndexSize" />
+        </BoxContainer>
+    </BoxContainer>
+</Control>

Robust.Client/UserInterface/DevWindow/ProfSettings.xaml.cs

@@ -0,0 +1,52 @@
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared;
+using Robust.Shared.Configuration;
+using Robust.Shared.IoC;
+using Robust.Shared.Profiling;
+using Robust.Shared.Utility;
+
+namespace Robust.Client.UserInterface;
+
+[GenerateTypedNameReferences]
+internal sealed partial class ProfSettings : Control
+{
+    [Dependency] private readonly IConfigurationManager _cfg = default!;
+
+    public ProfSettings()
+    {
+        IoCManager.InjectDependencies(this);
+        RobustXamlLoader.Load(this);
+    }
+
+    protected override void EnteredTree()
+    {
+        _cfg.OnValueChanged(CVars.ProfEnabled, CfgEnabledChanged, true);
+        _cfg.OnValueChanged(CVars.ProfBufferSize, CfgBufferSizeChanged, true);
+        _cfg.OnValueChanged(CVars.ProfIndexSize, CfgIndexSizeChanged, true);
+    }
+
+    protected override void ExitedTree()
+    {
+        _cfg.UnsubValueChanged(CVars.ProfEnabled, CfgEnabledChanged);
+        _cfg.UnsubValueChanged(CVars.ProfBufferSize, CfgBufferSizeChanged);
+        _cfg.UnsubValueChanged(CVars.ProfIndexSize, CfgIndexSizeChanged);
+    }
+
+    private void CfgEnabledChanged(bool obj)
+    {
+        SettingEnabled.Pressed = obj;
+    }
+
+    private unsafe void CfgBufferSizeChanged(int obj)
+    {
+        var bytes = BufferHelpers.FittingPowerOfTwo(obj) * sizeof(ProfLog);
+        SettingBufferSize.Text = $"{obj} ({ByteHelpers.FormatBytes(bytes)})";
+    }
+
+    private unsafe void CfgIndexSizeChanged(int obj)
+    {
+        var bytes = BufferHelpers.FittingPowerOfTwo(obj) * sizeof(ProfIndex);
+        SettingIndexSize.Text = $"{obj} ({ByteHelpers.FormatBytes(bytes)})";
+    }
+}

Robust.Client/UserInterface/DevWindow/ProfTree.xaml

@@ -0,0 +1,15 @@
+<Control xmlns="https://spacestation14.io"
+         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+         x:Class="Robust.Client.UserInterface.ProfTree"
+         MinHeight="64">
+    <ScrollContainer Name="TreeScroll"
+                     HScrollEnabled="False" VScrollEnabled="True">
+        <BoxContainer Orientation="Vertical">
+            <!-- Header values filled in in constructor -->
+            <ProfAltBackground IsAltBackground="True">
+                <ProfTreeLine Name="Header" />
+            </ProfAltBackground>
+            <BoxContainer Orientation="Vertical" Name="TreeRoot" />
+        </BoxContainer>
+    </ScrollContainer>
+</Control>

Robust.Client/UserInterface/DevWindow/ProfTree.xaml.cs

@@ -0,0 +1,296 @@
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Robust.Client.AutoGenerated;
+using Robust.Client.Profiling;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Maths;
+using Robust.Shared.Profiling;
+using Robust.Shared.Utility.Collections;
+
+namespace Robust.Client.UserInterface;
+
+[GenerateTypedNameReferences]
+internal sealed partial class ProfTree : Control
+{
+    public const float TreeLevelMargin = 16;
+
+    [Dependency] private readonly ProfManager _prof = default!;
+    [Dependency] private readonly ProfViewManager _profViewMgr = default!;
+
+    private ProfViewManager.Snapshot? _snapshot;
+    public long Frame;
+
+    private readonly TreeExpand _treeExpand = new();
+
+    public ProfTree()
+    {
+        RobustXamlLoader.Load(this);
+        IoCManager.InjectDependencies(this);
+
+        Header.Text.Text = "Thing";
+        Header.SideLabel.Text = "Misc";
+        Header.TimeLabel.Text = "Time";
+        Header.PercentTimeLabel.Text = "Time%";
+        Header.AllocLabel.Text = "Alloc";
+        Header.PercentAllocLabel.Text = "Alloc%";
+    }
+
+    public void LoadSnapshot(ProfViewManager.Snapshot snapshot)
+    {
+        _snapshot = snapshot;
+    }
+
+    public void RebuildTree()
+    {
+        if (_snapshot == null)
+            return;
+
+        TreeRoot.RemoveAllChildren();
+
+        ref var buf = ref _snapshot.Buffer;
+        var indexIdx = _profViewMgr.GetIndexOfFrame(Frame, _snapshot);
+        if (indexIdx == 0)
+        {
+            Logger.WarningS("prof.ui", $"Unable to find index for frame: {Frame}");
+            return;
+        }
+
+        // Index for this frame's data.
+        ref var index = ref _snapshot.Buffer.Index(indexIdx);
+
+        // The frame must be wrapped in a whole group. We display this group.
+        var i = index.EndPos - 1;
+        ref var logEnd = ref buf.Log(i);
+        var controls = new ValueList<Control>();
+
+        // Create child controls.
+        var countDict = new Dictionary<int, int>();
+        var totalFrameTime = ProfGraphView.GetFrameTime(buf, index);
+        var (totalCounts, _) = GetTotalGroupCounts(buf, i, logEnd.GroupEnd.StartIndex);
+
+        BuildData data = default;
+        data.Buffer = buf;
+        data.Index = index;
+        data.TotalFrameTime = totalFrameTime;
+
+        // We traverse the log backwards because we can use GroupEnd nodes to skip over data entirely.
+
+        for (; i >= index.StartPos; i--)
+        {
+            // Recursively build the tree.
+            ref var log = ref buf.Log(i);
+            RebuildTreeAddControls(
+                in data,
+                ref controls,
+                ref i,
+                in log,
+                totalCounts,
+                countDict,
+                _treeExpand,
+                2);
+        }
+
+        // Because we traversed backwards, the control list is backwards too.
+        // Insert backwards again to fix that.
+        for (var c = controls.Count - 1; c >= 0; c--)
+        {
+            TreeRoot.AddChild(controls[c]);
+        }
+
+        // Do a final pass to assign the alternating background colors.
+        // Easier to do here than to do it while we're creating the controls.
+        var alt = false;
+        foreach (var child in TreeRoot.Children)
+        {
+            DoAltBackgrounds(child, ref alt);
+        }
+    }
+
+    private static void DoAltBackgrounds(Control control, ref bool alt)
+    {
+        if (control is not ProfAltBackground altBg)
+            return;
+
+        altBg.IsAltBackground = alt;
+        alt = !alt;
+    }
+
+    private void RebuildTreeAddControls(
+        in BuildData data,
+        ref ValueList<Control> insertInto,
+        ref long i,
+        in ProfLog log,
+        Dictionary<int, int> totalCounts,
+        Dictionary<int, int> countDict,
+        TreeExpand expandParent,
+        float margin)
+    {
+        switch (log.Type)
+        {
+            case ProfLogType.Value:
+                TreeInsertSample(in data, ref insertInto, log.Value.StringId, log.Value.Value, margin);
+                break;
+
+            case ProfLogType.GroupEnd:
+                var stringId = log.GroupEnd.StringId;
+
+                ref var count = ref CollectionsMarshal.GetValueRefOrAddDefault(countDict, stringId, out _);
+                count += 1;
+                var totalCount = totalCounts[stringId];
+
+                var stringI = totalCount - count;
+
+                TreeInsertGroup(
+                    in data,
+                    ref insertInto,
+                    ref i,
+                    in log.GroupEnd,
+                    (stringId, stringI),
+                    expandParent,
+                    margin);
+                break;
+        }
+    }
+
+    private void TreeInsertSample(
+        in BuildData data,
+        ref ValueList<Control> insertInto,
+        int stringId,
+        in ProfValue value,
+        float margin)
+    {
+        var treeLine = new ProfTreeLine();
+        treeLine.Margin = new Thickness(treeLine.Margin.Left + margin + 12 + 2, 0, 0, 0);
+        FillTreeLine(in data, treeLine, stringId, value);
+        insertInto.Add(new ProfAltBackground { Children = { treeLine } });
+    }
+
+    private void TreeInsertGroup(
+        in BuildData data,
+        ref ValueList<Control> insertInto,
+        ref long i,
+        in ProfLogGroupEnd logEnd,
+        (int str, int i) expandId,
+        TreeExpand expandParent,
+        float margin)
+    {
+        i -= 1;
+
+        var (totalCounts, anyChildren) = GetTotalGroupCounts(data.Buffer, i, logEnd.StartIndex);
+
+        if (!anyChildren)
+        {
+            // Node has no children we can display. Just insert it as if it's a sample and move along.
+            TreeInsertSample(in data, ref insertInto, logEnd.StringId, logEnd.Value, margin);
+            i = logEnd.StartIndex;
+            return;
+        }
+
+        var groupControl = new ProfTreeEntry(this, expandParent, expandId, margin);
+        var altBg = new ProfAltBackground { Children = { groupControl } };
+        FillTreeLine(in data, groupControl.TextLine, logEnd.StringId, logEnd.Value);
+
+
+        // Look up in the parent's expand data whether we're expanded.
+        var expand = expandParent.ExpandedItems.GetValueOrDefault(expandId);
+        if (expand is not { Enabled: true })
+        {
+            // Note expanded. Skip!
+            i = logEnd.StartIndex;
+            insertInto.Add(altBg);
+            return;
+        }
+
+        groupControl.Arrow.Rotated = true;
+
+        // Create child controls.
+        var countDict = new Dictionary<int, int>();
+
+        for (; i >= data.Index.StartPos; i--)
+        {
+            ref var log = ref data.Buffer.Log(i);
+            if (log.Type == ProfLogType.GroupStart)
+                break;
+
+            RebuildTreeAddControls(
+                in data,
+                ref insertInto,
+                ref i,
+                in log,
+                totalCounts,
+                countDict,
+                expand,
+                margin + TreeLevelMargin);
+        }
+
+        insertInto.Add(altBg);
+    }
+
+    private static (Dictionary<int, int> counts, bool anyChildren) GetTotalGroupCounts(
+        in ProfBuffer buffer,
+        long i,
+        long startIdx)
+    {
+        var anyChildren = false;
+        var dict = new Dictionary<int, int>();
+
+        for (; i > startIdx; i--)
+        {
+            ref var log = ref buffer.Log(i);
+
+            anyChildren |= log.Type is ProfLogType.GroupEnd or ProfLogType.Value;
+
+            if (log.Type != ProfLogType.GroupEnd)
+                continue;
+
+            i = log.GroupEnd.StartIndex;
+            ref var val = ref CollectionsMarshal.GetValueRefOrAddDefault(dict, log.GroupEnd.StringId, out _);
+            val += 1;
+        }
+
+        return (dict, anyChildren);
+    }
+
+    private void FillTreeLine(
+        in BuildData data,
+        ProfTreeLine line,
+        int stringId,
+        in ProfValue value)
+    {
+        line.Text.Text = _prof.GetString(stringId);
+
+        switch (value.Type)
+        {
+            case ProfValueType.TimeAllocSample:
+                line.TimeLabel.Text = $"{value.TimeAllocSample.Time * 1000:N2} ms";
+                line.PercentTimeLabel.Text = $"{value.TimeAllocSample.Time / data.TotalFrameTime.Time:P2}";
+                line.AllocLabel.Text = $"{value.TimeAllocSample.Alloc} B";
+                line.PercentAllocLabel.Text = $"{value.TimeAllocSample.Alloc / (float)data.TotalFrameTime.Alloc:P2}";
+                break;
+            case ProfValueType.Int32:
+                line.SideLabel.Text = value.Int32.ToString();
+                break;
+            case ProfValueType.Int64:
+                line.SideLabel.Text = value.Int64.ToString();
+                break;
+            default:
+                line.SideLabel.Text = "???";
+                break;
+        }
+    }
+
+    internal sealed class TreeExpand
+    {
+        public bool Enabled = true;
+        public readonly Dictionary<(int str, int i), TreeExpand> ExpandedItems = new();
+    }
+
+    private struct BuildData
+    {
+        public ProfBuffer Buffer;
+        public ProfIndex Index;
+        public TimeAndAllocSample TotalFrameTime;
+    }
+}