feat: add wndproc nullref fix

Dalamud/Dalamud.cs

@@ -7,6 +7,7 @@ using System.Threading;
 
 using Dalamud.Configuration.Internal;
 using Dalamud.Data;
+using Dalamud.Fixes;
 using Dalamud.Game;
 using Dalamud.Game.ClientState;
 using Dalamud.Game.Command;
@@ -102,6 +103,10 @@ namespace Dalamud
                 Service<SigScanner>.Set(new SigScanner(true));
                 Service<HookManager>.Set();
 
+                // Initialize game fixes
+                var gameFixes = Service<GameFixes>.Set();
+                gameFixes.Apply();
+
                 // Initialize FFXIVClientStructs function resolver
                 FFXIVClientStructs.Resolver.Initialize();
                 Log.Information("[T1] FFXIVClientStructs initialized!");
@@ -347,6 +352,8 @@ namespace Dalamud
                 Service<Framework>.GetNullable()?.ExplicitDispose();
                 Service<ClientState>.GetNullable()?.ExplicitDispose();
 
+                Service<GameFixes>.GetNullable()?.ExplicitDispose();
+
                 this.unloadSignal?.Dispose();
 
                 Service<WinSockHandlers>.GetNullable()?.Dispose();

Dalamud/EntryPoint.cs

@@ -212,7 +212,7 @@ namespace Dalamud
 
             var levelSwitch = new LoggingLevelSwitch(LogEventLevel.Verbose);
             Log.Logger = new LoggerConfiguration()
-                .WriteTo.Async(a => a.File(logPath))
+                .WriteTo.Async(a => a.File(logPath, fileSizeLimitBytes: null, buffered: false, flushToDiskInterval: TimeSpan.FromSeconds(1)))
                 .WriteTo.Sink(SerilogEventSink.Instance)
                 .MinimumLevel.ControlledBy(levelSwitch)
                 .CreateLogger();

Dalamud/Fixes/GameFixes.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Linq;
+using Serilog;
+
+namespace Dalamud.Fixes;
+
+/// <summary>
+/// Class responsible for executing game fixes.
+/// </summary>
+internal class GameFixes : IDisposable
+{
+    private readonly IGameFix[] fixes =
+    {
+        new WndProcNullRefFix(),
+    };
+
+    /// <summary>
+    /// Apply all game fixes.
+    /// </summary>
+    public void Apply()
+    {
+        foreach (var gameFix in this.fixes)
+        {
+            try
+            {
+                gameFix.Apply();
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Could not apply game fix: {FixName}", gameFix.GetType().FullName);
+            }
+        }
+    }
+
+    /// <inheritdoc/>
+    public void Dispose()
+    {
+        foreach (var disposable in this.fixes.OfType<IDisposable>())
+        {
+            disposable.Dispose();
+        }
+    }
+}

Dalamud/Fixes/IGameFix.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Dalamud.Fixes;
+
+/// <summary>
+/// Base interface to be implemented by game fixes.
+/// </summary>
+internal interface IGameFix
+{
+    /// <summary>
+    /// Apply the patch to the game.
+    /// </summary>
+    public void Apply();
+}

Dalamud/Fixes/WndProcNullRefFix.cs

@@ -0,0 +1,45 @@
+using System;
+using Dalamud.Game;
+using Dalamud.Hooking;
+using Serilog;
+
+namespace Dalamud.Fixes;
+
+/// <summary>
+/// This fix is for the following issue:
+/// Null reference in the game's WndProc function when certain window messages arrive
+/// before an object on the game's input manager is initialized.
+/// </summary>
+internal class WndProcNullRefFix : IGameFix, IDisposable
+{
+    private AsmHook? wndProcHook;
+
+    /// <inheritdoc/>
+    public void Apply()
+    {
+        var sigScanner = Service<SigScanner>.Get();
+
+        if (!sigScanner.TryScanText("E8 ?? ?? ?? ?? 48 83 38 00 74 14", out var patchAddress))
+        {
+            Log.Error("Failed to find WndProc patch address");
+            return;
+        }
+
+        Log.Information($"Applying WndProcNullRefFix at {patchAddress:X}");
+
+        var patchAsm = new byte[]
+        {
+            0x48, 0x85, 0xc0, // test rax, rax
+            0x74, 0x15, // jz +0x1A
+        };
+
+        this.wndProcHook = new AsmHook(patchAddress, patchAsm, "WndProcNullRefFix");
+        this.wndProcHook.Enable();
+    }
+
+    /// <inheritdoc/>
+    public void Dispose()
+    {
+        this.wndProcHook?.Dispose();
+    }
+}

Dalamud/Interface/Internal/Windows/IMEWindow.cs

@@ -1,7 +1,7 @@
 using System.Numerics;
+
 using Dalamud.Game.ClientState.Keys;
 using Dalamud.Game.Gui.Internal;
-using Dalamud.Interface.Colors;
 using Dalamud.Interface.Windowing;
 using ImGuiNET;