eighty three

Reviewed-on: #144

LightlessSync/Interop/Ipc/Penumbra/PenumbraTexture.cs

@@ -92,7 +92,7 @@ public sealed class PenumbraTexture : PenumbraBase
     {
         token.ThrowIfCancellationRequested();
 
-        logger.LogInformation("Converting texture {Input} -> {Output} ({Target})", job.InputFile, job.OutputFile, job.TargetType);
+        logger.LogDebug("Converting texture {Input} -> {Output} ({Target})", job.InputFile, job.OutputFile, job.TargetType);
         var convertTask = _convertTextureFile.Invoke(job.InputFile, job.OutputFile, job.TargetType, job.IncludeMipMaps);
         await convertTask.ConfigureAwait(false);
 

LightlessSync/LightlessSync.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Authors></Authors>
     <Company></Company>
-    <Version>2.0.2.80</Version>
+    <Version>2.0.2.83</Version>
     <Description></Description>
     <Copyright></Copyright>
     <PackageProjectUrl>https://github.com/Light-Public-Syncshells/LightlessClient</PackageProjectUrl>

LightlessSync/PlayerData/Factories/PlayerDataFactory.cs

@@ -127,79 +127,23 @@ public class PlayerDataFactory
         {
             nint basePtr = playerPointer;
 
-            if (!LooksLikeUserPtr(basePtr))
+            if (!PtrGuard.LooksLikePtr(basePtr))
                 return true;
 
             nint drawObjAddr = basePtr + _drawObjectOffset;
 
-            if (!TryReadIntPtr(drawObjAddr, out var drawObj))
+            if (!PtrGuard.IsReadable(drawObjAddr, (nuint)IntPtr.Size))
+                return true;
+
+            if (!PtrGuard.TryReadIntPtr(drawObjAddr, out var drawObj))
+                return true;
+
+            if (drawObj != 0 && !PtrGuard.LooksLikePtr(drawObj))
                 return true;
 
             return drawObj == 0;
         }).ConfigureAwait(false);
 
-    private static bool LooksLikeUserPtr(nint p)
-    {
-        if (p == 0) return false;
-
-        ulong u = (ulong)p;
-
-        if (u < 0x0000_0001_0000UL) return false;
-        if (u > 0x0000_7FFF_FFFF_FFFFUL) return false;
-        if ((u & 0x7UL) != 0) return false;
-
-        return true;
-    }
-
-    private static bool TryReadIntPtr(nint addr, out nint value)
-    {
-        value = 0;
-
-        if (!VirtualReadable(addr))
-            return false;
-
-        try
-        {
-            value = Marshal.ReadIntPtr(addr);
-            return true;
-        }
-        catch
-        {
-            return false;
-        }
-    }
-
-    private static bool VirtualReadable(nint addr)
-    {
-        if (VirtualQuery(addr, out var mbi, (nuint)Marshal.SizeOf<MEMORY_BASIC_INFORMATION>()) == 0)
-            return false;
-
-        const uint MEM_COMMIT = 0x1000;
-        const uint PAGE_NOACCESS = 0x01;
-        const uint PAGE_GUARD = 0x100;
-
-        if (mbi.State != MEM_COMMIT) return false;
-        if ((mbi.Protect & PAGE_GUARD) != 0) return false;
-        if (mbi.Protect == PAGE_NOACCESS) return false;
-
-        return true;
-    }
-
-    [DllImport("kernel32.dll", SetLastError = true)]
-    private static extern nuint VirtualQuery(nint lpAddress, out MEMORY_BASIC_INFORMATION lpBuffer, nuint dwLength);
-
-    [StructLayout(LayoutKind.Sequential)]
-    private struct MEMORY_BASIC_INFORMATION
-    {
-        public nint BaseAddress;
-        public nint AllocationBase;
-        public uint AllocationProtect;
-        public nuint RegionSize;
-        public uint State;
-        public uint Protect;
-        public uint Type;
-    }
-
     private static bool IsCacheFresh(CacheEntry entry)
         => (DateTime.UtcNow - entry.CreatedUtc) <= _characterCacheTtl;
 

LightlessSync/PlayerData/Handlers/GameObjectHandler.cs

@@ -2,11 +2,12 @@
 using FFXIVClientStructs.FFXIV.Client.Graphics.Scene;
 using LightlessSync.Services;
 using LightlessSync.Services.Mediator;
+using LightlessSync.Utils;
 using Microsoft.Extensions.Logging;
 using System.Runtime.CompilerServices;
 using static FFXIVClientStructs.FFXIV.Client.Game.Character.DrawDataContainer;
-using VisibilityFlags = FFXIVClientStructs.FFXIV.Client.Game.Object.VisibilityFlags;
 using ObjectKind = LightlessSync.API.Data.Enum.ObjectKind;
+using VisibilityFlags = FFXIVClientStructs.FFXIV.Client.Game.Object.VisibilityFlags;
 
 namespace LightlessSync.PlayerData.Handlers;
 
@@ -177,18 +178,41 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
         var prevDrawObj = DrawObjectAddress;
         string? nameString = null;
 
-        Address = _getAddress();
+        var nextAddr = _getAddress();
+
+        if (nextAddr != IntPtr.Zero && !PtrGuard.LooksLikePtr(nextAddr))
+        {
+            nextAddr = IntPtr.Zero;
+        }
+
+        if (nextAddr != IntPtr.Zero &&
+            !PtrGuard.IsReadable(nextAddr, (nuint)sizeof(FFXIVClientStructs.FFXIV.Client.Game.Object.GameObject)))
+        {
+            nextAddr = IntPtr.Zero;
+        }
+
+        Address = nextAddr;
 
         if (Address != IntPtr.Zero)
         {
             var gameObject = (FFXIVClientStructs.FFXIV.Client.Game.Object.GameObject*)Address;
-            DrawObjectAddress = (IntPtr)gameObject->DrawObject;
+
+            var draw = (nint)gameObject->DrawObject;
+
+            if (!PtrGuard.LooksLikePtr(draw) || !PtrGuard.IsReadable(draw, (nuint)sizeof(DrawObject)))
+                draw = 0;
+
+            DrawObjectAddress = draw;
             EntityId = gameObject->EntityId;
 
-            var chara = (Character*)Address;
+            if (PtrGuard.IsReadable(Address, (nuint)sizeof(Character)))
-            nameString = chara->GameObject.NameString;
+            {
-            if (!string.IsNullOrEmpty(nameString) && !string.Equals(nameString, Name, StringComparison.Ordinal))
+                var chara = (Character*)Address;
-                Name = nameString;
+                nameString = chara->GameObject.NameString;
+
+                if (!string.IsNullOrEmpty(nameString) && !string.Equals(nameString, Name, StringComparison.Ordinal))
+                    Name = nameString;
+            }
         }
         else
         {
@@ -196,22 +220,27 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
             EntityId = uint.MaxValue;
         }
 
-        CurrentDrawCondition = IsBeingDrawnUnsafe();
+        CurrentDrawCondition = (Address != IntPtr.Zero && DrawObjectAddress != IntPtr.Zero)
+            ? IsBeingDrawnUnsafe()
+            : DrawCondition.DrawObjectZero;
 
         if (_haltProcessing || !allowPublish) return;
 
         bool drawObjDiff = DrawObjectAddress != prevDrawObj;
         bool addrDiff = Address != prevAddr;
 
-        if (Address != IntPtr.Zero && DrawObjectAddress != IntPtr.Zero)
+        if (Address != IntPtr.Zero && DrawObjectAddress != IntPtr.Zero
+            && PtrGuard.IsReadable(Address, (nuint)sizeof(Character))
+            && PtrGuard.IsReadable(DrawObjectAddress, (nuint)sizeof(DrawObject)))
         {
             var chara = (Character*)Address;
             var drawObj = (DrawObject*)DrawObjectAddress;
+
             var objType = drawObj->Object.GetObjectType();
             var isHuman = objType == ObjectType.CharacterBase
                           && ((CharacterBase*)drawObj)->GetModelType() == CharacterBase.ModelType.Human;
 
-            nameString ??= ((Character*)Address)->GameObject.NameString;
+            nameString ??= chara->GameObject.NameString;
             var nameChange = !string.Equals(nameString, Name, StringComparison.Ordinal);
             if (nameChange) Name = nameString;
 
@@ -219,32 +248,36 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
 
             if (isHuman)
             {
-                var classJob = chara->CharacterData.ClassJob;
+                if (PtrGuard.IsReadable(DrawObjectAddress, (nuint)sizeof(Human)))
-                if (classJob != _classJob)
                 {
-                    Logger.LogTrace("[{this}] classjob changed from {old} to {new}", this, _classJob, classJob);
+                    var classJob = chara->CharacterData.ClassJob;
-                    _classJob = classJob;
+                    if (classJob != _classJob)
-                    Mediator.Publish(new ClassJobChangedMessage(this));
+                    {
+                        Logger.LogTrace("[{this}] classjob changed from {old} to {new}", this, _classJob, classJob);
+                        _classJob = classJob;
+                        Mediator.Publish(new ClassJobChangedMessage(this));
+                    }
+
+                    equipDiff = CompareAndUpdateEquipByteData((byte*)&((Human*)drawObj)->Head);
+
+                    ref var mh = ref chara->DrawData.Weapon(WeaponSlot.MainHand);
+                    ref var oh = ref chara->DrawData.Weapon(WeaponSlot.OffHand);
+
+                    equipDiff |= CompareAndUpdateMainHand((Weapon*)mh.DrawObject);
+                    equipDiff |= CompareAndUpdateOffHand((Weapon*)oh.DrawObject);
+                }
+                else
+                {
+                    isHuman = false;
                 }
-
-                equipDiff = CompareAndUpdateEquipByteData((byte*)&((Human*)drawObj)->Head);
-
-                ref var mh = ref chara->DrawData.Weapon(WeaponSlot.MainHand);
-                ref var oh = ref chara->DrawData.Weapon(WeaponSlot.OffHand);
-                equipDiff |= CompareAndUpdateMainHand((Weapon*)mh.DrawObject);
-                equipDiff |= CompareAndUpdateOffHand((Weapon*)oh.DrawObject);
-
-                if (equipDiff)
-                    Logger.LogTrace("Checking [{this}] equip data as human from draw obj, result: {diff}", this, equipDiff);
             }
-            else
+
+            if (!isHuman)
             {
                 equipDiff = CompareAndUpdateEquipByteData((byte*)Unsafe.AsPointer(ref chara->DrawData.EquipmentModelIds[0]));
-                if (equipDiff)
-                    Logger.LogTrace("Checking [{this}] equip data from game obj, result: {diff}", this, equipDiff);
             }
 
-            if (equipDiff && !_isOwnedObject) // send the message out immediately and cancel out, no reason to continue if not self
+            if (equipDiff && !_isOwnedObject)
             {
                 Logger.LogTrace("[{this}] Changed", this);
                 return;
@@ -252,11 +285,13 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
 
             bool customizeDiff = false;
 
-            if (isHuman)
+            if (isHuman && PtrGuard.IsReadable(DrawObjectAddress, (nuint)sizeof(Human)))
             {
-                var gender = ((Human*)drawObj)->Customize.Sex;
+                var human = (Human*)drawObj;
-                var raceId = ((Human*)drawObj)->Customize.Race;
+
-                var tribeId = ((Human*)drawObj)->Customize.Tribe;
+                var gender = human->Customize.Sex;
+                var raceId = human->Customize.Race;
+                var tribeId = human->Customize.Tribe;
 
                 if (_isOwnedObject && ObjectKind == ObjectKind.Player
                     && (gender != Gender || raceId != RaceId || tribeId != TribeId))
@@ -267,15 +302,11 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
                     TribeId = tribeId;
                 }
 
-                customizeDiff = CompareAndUpdateCustomizeData(((Human*)drawObj)->Customize.Data);
+                customizeDiff = CompareAndUpdateCustomizeData(human->Customize.Data);
-                if (customizeDiff)
-                    Logger.LogTrace("Checking [{this}] customize data as human from draw obj, result: {diff}", this, customizeDiff);
             }
             else
             {
                 customizeDiff = CompareAndUpdateCustomizeData(chara->DrawData.CustomizeData.Data);
-                if (customizeDiff)
-                    Logger.LogTrace("Checking [{this}] customize data from game obj, result: {diff}", this, equipDiff);
             }
 
             if ((addrDiff || drawObjDiff || equipDiff || customizeDiff || nameChange) && _isOwnedObject)
@@ -289,12 +320,11 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
             CurrentDrawCondition = DrawCondition.DrawObjectZero;
             Logger.LogTrace("[{this}] Changed", this);
             if (_isOwnedObject && ObjectKind != ObjectKind.Player)
-            {
                 Mediator.Publish(new ClearCacheForObjectMessage(this));
-            }
         }
     }
 
+
     private unsafe bool CompareAndUpdateCustomizeData(Span<byte> customizeData)
     {
         bool hasChanges = false;
@@ -330,7 +360,10 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
 
     private unsafe bool CompareAndUpdateMainHand(Weapon* weapon)
     {
-        if ((nint)weapon == nint.Zero) return false;
+        var p = (nint)weapon;
+        if (!PtrGuard.LooksLikePtr(p) || !PtrGuard.IsReadable(p, (nuint)sizeof(Weapon)))
+            return false;
+
         bool hasChanges = false;
         hasChanges |= weapon->ModelSetId != MainHandData[0];
         MainHandData[0] = weapon->ModelSetId;
@@ -343,7 +376,10 @@ public sealed class GameObjectHandler : DisposableMediatorSubscriberBase, IHighP
 
     private unsafe bool CompareAndUpdateOffHand(Weapon* weapon)
     {
-        if ((nint)weapon == nint.Zero) return false;
+        var p = (nint)weapon;
+        if (!PtrGuard.LooksLikePtr(p) || !PtrGuard.IsReadable(p, (nuint)sizeof(Weapon)))
+            return false;
+
         bool hasChanges = false;
         hasChanges |= weapon->ModelSetId != OffHandData[0];
         OffHandData[0] = weapon->ModelSetId;

LightlessSync/Plugin.cs

@@ -125,6 +125,8 @@ public sealed class Plugin : IDalamudPlugin
         services.AddSingleton<FileTransferOrchestrator>();
         services.AddSingleton<LightlessPlugin>();
         services.AddSingleton<LightlessProfileManager>();
+        services.AddSingleton<TextureProcessingQueue>();
+        services.AddSingleton<ModelProcessingQueue>();
         services.AddSingleton<TextureCompressionService>();
         services.AddSingleton<TextureDownscaleService>();
         services.AddSingleton<ModelDecimationService>();

LightlessSync/Services/AssetProcessingQueue.cs

@@ -0,0 +1,93 @@
+using Microsoft.Extensions.Logging;
+using System.Collections.Concurrent;
+
+namespace LightlessSync.Services;
+
+public sealed class AssetProcessingQueue : IDisposable
+{
+    private readonly BlockingCollection<WorkItem> _queue = new();
+    private readonly Thread _worker;
+    private readonly ILogger _logger;
+    private bool _disposed;
+
+    public AssetProcessingQueue(ILogger logger, string name)
+    {
+        _logger = logger;
+        _worker = new Thread(Run)
+        {
+            IsBackground = true,
+            Name = string.IsNullOrWhiteSpace(name) ? "LightlessSync.AssetProcessing" : name
+        };
+        _worker.Start();
+    }
+
+    public Task Enqueue(Func<CancellationToken, Task> work, CancellationToken token = default)
+    {
+        if (work is null)
+        {
+            throw new ArgumentNullException(nameof(work));
+        }
+
+        var completion = new TaskCompletionSource<object?>(TaskCreationOptions.RunContinuationsAsynchronously);
+        if (token.IsCancellationRequested)
+        {
+            completion.TrySetCanceled(token);
+            return completion.Task;
+        }
+
+        if (_queue.IsAddingCompleted || _disposed)
+        {
+            completion.TrySetException(new ObjectDisposedException(nameof(AssetProcessingQueue)));
+            return completion.Task;
+        }
+
+        _queue.Add(new WorkItem(work, token, completion));
+        return completion.Task;
+    }
+
+    private void Run()
+    {
+        foreach (var item in _queue.GetConsumingEnumerable())
+        {
+            if (item.Token.IsCancellationRequested)
+            {
+                item.Completion.TrySetCanceled(item.Token);
+                continue;
+            }
+
+            try
+            {
+                item.Work(item.Token).GetAwaiter().GetResult();
+                item.Completion.TrySetResult(null);
+            }
+            catch (OperationCanceledException ex)
+            {
+                var token = ex.CancellationToken.IsCancellationRequested ? ex.CancellationToken : item.Token;
+                item.Completion.TrySetCanceled(token);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Asset processing job failed.");
+                item.Completion.TrySetException(ex);
+            }
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+        _queue.CompleteAdding();
+        _worker.Join(TimeSpan.FromSeconds(2));
+        _queue.Dispose();
+    }
+
+    private readonly record struct WorkItem(
+        Func<CancellationToken, Task> Work,
+        CancellationToken Token,
+        TaskCompletionSource<object?> Completion);
+}

LightlessSync/Services/ModelDecimation/MdlDecimator.cs

@@ -2104,6 +2104,16 @@ internal static class MdlDecimator
             }
         }
 
+        if (boneWeights != null
+            && blendWeightEncoding == BlendWeightEncoding.Default
+            && format.BlendWeightsElement is { } blendWeightsElement
+            && (MdlFile.VertexType)blendWeightsElement.Type == MdlFile.VertexType.UShort4
+            && ShouldTreatWeightsAsByteNormalized(boneWeights))
+        {
+            RescaleUShortAsByteWeights(boneWeights);
+            blendWeightEncoding = BlendWeightEncoding.UShortAsByte;
+        }
+
         decoded = new DecodedMeshData(positions, normals, tangents, tangents2, colors, boneWeights, uvChannels, positionWs, normalWs, blendWeightEncoding);
         return true;
     }
@@ -3413,6 +3423,44 @@ internal static class MdlDecimator
         return ToUShortNormalized(normalized);
     }
 
+    private static bool ShouldTreatWeightsAsByteNormalized(BoneWeight[] weights)
+    {
+        const float maxByteUnorm = byte.MaxValue / (float)ushort.MaxValue;
+        var maxWeight = 0f;
+        for (var i = 0; i < weights.Length; i++)
+        {
+            var weight = weights[i];
+            maxWeight = Math.Max(maxWeight, weight.weight0);
+            maxWeight = Math.Max(maxWeight, weight.weight1);
+            maxWeight = Math.Max(maxWeight, weight.weight2);
+            maxWeight = Math.Max(maxWeight, weight.weight3);
+            if (maxWeight > maxByteUnorm)
+            {
+                return false;
+            }
+        }
+
+        return maxWeight > 0f;
+    }
+
+    private static void RescaleUShortAsByteWeights(BoneWeight[] weights)
+    {
+        var scale = ushort.MaxValue / (float)byte.MaxValue;
+        for (var i = 0; i < weights.Length; i++)
+        {
+            var weight = weights[i];
+            weights[i] = new BoneWeight(
+                weight.index0,
+                weight.index1,
+                weight.index2,
+                weight.index3,
+                weight.weight0 * scale,
+                weight.weight1 * scale,
+                weight.weight2 * scale,
+                weight.weight3 * scale);
+        }
+    }
+
     private static void NormalizeWeights(float[] weights)
     {
         var sum = weights.Sum();

LightlessSync/Services/ModelDecimation/ModelDecimationService.cs

@@ -1,6 +1,7 @@
 using LightlessSync.FileCache;
 using LightlessSync.LightlessConfiguration;
 using LightlessSync.LightlessConfiguration.Configurations;
+using LightlessSync.Services;
 using LightlessSync.Utils;
 using Microsoft.Extensions.Logging;
 using System.Collections.Concurrent;
@@ -19,6 +20,7 @@ public sealed class ModelDecimationService
     private readonly FileCacheManager _fileCacheManager;
     private readonly PlayerPerformanceConfigService _performanceConfigService;
     private readonly XivDataStorageService _xivDataStorageService;
+    private readonly ModelProcessingQueue _processingQueue;
     private readonly SemaphoreSlim _decimationSemaphore = new(MaxConcurrentJobs);
 
     private readonly TaskRegistry<string> _decimationDeduplicator = new();
@@ -30,13 +32,15 @@ public sealed class ModelDecimationService
         LightlessConfigService configService,
         FileCacheManager fileCacheManager,
         PlayerPerformanceConfigService performanceConfigService,
-        XivDataStorageService xivDataStorageService)
+        XivDataStorageService xivDataStorageService,
+        ModelProcessingQueue processingQueue)
     {
         _logger = logger;
         _configService = configService;
         _fileCacheManager = fileCacheManager;
         _performanceConfigService = performanceConfigService;
         _xivDataStorageService = xivDataStorageService;
+        _processingQueue = processingQueue;
     }
 
     public void ScheduleDecimation(string hash, string filePath, string? gamePath = null)
@@ -53,9 +57,9 @@ public sealed class ModelDecimationService
 
         _logger.LogDebug("Queued model decimation for {Hash}", hash);
 
-        _decimationDeduplicator.GetOrStart(hash, async () =>
+        _decimationDeduplicator.GetOrStart(hash, () => _processingQueue.Enqueue(async token =>
         {
-            await _decimationSemaphore.WaitAsync().ConfigureAwait(false);
+            await _decimationSemaphore.WaitAsync(token).ConfigureAwait(false);
             try
             {
                 await DecimateInternalAsync(hash, filePath).ConfigureAwait(false);
@@ -69,7 +73,7 @@ public sealed class ModelDecimationService
             {
                 _decimationSemaphore.Release();
             }
-        });
+        }, CancellationToken.None));
     }
 
     public void ScheduleBatchDecimation(string hash, string filePath, ModelDecimationSettings settings)
@@ -89,9 +93,9 @@ public sealed class ModelDecimationService
 
         _logger.LogInformation("Queued batch model decimation for {Hash}", hash);
 
-        _decimationDeduplicator.GetOrStart(hash, async () =>
+        _decimationDeduplicator.GetOrStart(hash, () => _processingQueue.Enqueue(async token =>
         {
-            await _decimationSemaphore.WaitAsync().ConfigureAwait(false);
+            await _decimationSemaphore.WaitAsync(token).ConfigureAwait(false);
             try
             {
                 await DecimateInternalAsync(hash, filePath, settings, allowExisting: false, destinationOverride: filePath, registerDecimatedPath: false).ConfigureAwait(false);
@@ -105,7 +109,7 @@ public sealed class ModelDecimationService
             {
                 _decimationSemaphore.Release();
             }
-        });
+        }, CancellationToken.None));
     }
 
     public bool ShouldScheduleDecimation(string hash, string filePath, string? gamePath = null)

LightlessSync/Services/ModelProcessingQueue.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+
+namespace LightlessSync.Services;
+
+public sealed class ModelProcessingQueue : IDisposable
+{
+    private readonly AssetProcessingQueue _queue;
+
+    public ModelProcessingQueue(ILogger<ModelProcessingQueue> logger)
+    {
+        _queue = new AssetProcessingQueue(logger, "LightlessSync.ModelProcessing");
+    }
+
+    public Task Enqueue(Func<CancellationToken, Task> work, CancellationToken token = default)
+        => _queue.Enqueue(work, token);
+
+    public void Dispose()
+        => _queue.Dispose();
+}

LightlessSync/Services/TextureCompression/TextureDownscaleService.cs

@@ -8,6 +8,7 @@ using System.Threading;
 using OtterTex;
 using OtterImage = OtterTex.Image;
 using LightlessSync.LightlessConfiguration;
+using LightlessSync.Services;
 using LightlessSync.Utils;
 using LightlessSync.FileCache;
 using Microsoft.Extensions.Logging;
@@ -33,6 +34,7 @@ public sealed class TextureDownscaleService
     private readonly PlayerPerformanceConfigService _playerPerformanceConfigService;
     private readonly FileCacheManager _fileCacheManager;
     private readonly TextureCompressionService _textureCompressionService;
+    private readonly TextureProcessingQueue _processingQueue;
 
     private readonly TaskRegistry<string> _downscaleDeduplicator = new();
     private readonly ConcurrentDictionary<string, string> _downscaledPaths = new(StringComparer.OrdinalIgnoreCase);
@@ -73,13 +75,15 @@ public sealed class TextureDownscaleService
         LightlessConfigService configService,
         PlayerPerformanceConfigService playerPerformanceConfigService,
         FileCacheManager fileCacheManager,
-        TextureCompressionService textureCompressionService)
+        TextureCompressionService textureCompressionService,
+        TextureProcessingQueue processingQueue)
     {
         _logger = logger;
         _configService = configService;
         _playerPerformanceConfigService = playerPerformanceConfigService;
         _fileCacheManager = fileCacheManager;
         _textureCompressionService = textureCompressionService;
+        _processingQueue = processingQueue;
     }
 
     public void ScheduleDownscale(string hash, string filePath, TextureMapKind mapKind)
@@ -90,7 +94,7 @@ public sealed class TextureDownscaleService
         if (!filePath.EndsWith(".tex", StringComparison.OrdinalIgnoreCase)) return;
         if (_downscaleDeduplicator.TryGetExisting(hash, out _)) return;
 
-        _downscaleDeduplicator.GetOrStart(hash, async () =>
+        _downscaleDeduplicator.GetOrStart(hash, () => _processingQueue.Enqueue(async token =>
         {
             TextureMapKind mapKind;
             try
@@ -104,7 +108,7 @@ public sealed class TextureDownscaleService
             }
 
             await DownscaleInternalAsync(hash, filePath, mapKind).ConfigureAwait(false);
-        });
+        }, CancellationToken.None));
     }
 
     public bool ShouldScheduleDownscale(string filePath)
@@ -382,6 +386,12 @@ public sealed class TextureDownscaleService
     {
         var isCompressed = sourceFormat.IsCompressed();
         var targetFormat = isCompressed ? sourceFormat : DXGIFormat.B8G8R8A8UNorm;
+        _logger.LogDebug(
+            "Downscale convert target {TargetFormat} (source {SourceFormat}, compressed {IsCompressed}, penumbraFallback {PenumbraFallback})",
+            targetFormat,
+            sourceFormat,
+            isCompressed,
+            attemptPenumbraFallback);
         try
         {
             result = source.Convert(targetFormat);
@@ -433,6 +443,7 @@ public sealed class TextureDownscaleService
     {
         try
         {
+            _logger.LogDebug("Downscale Penumbra re-encode target {Target} for {Hash}.", target, hash);
             using var uncompressed = resizedScratch.Convert(DXGIFormat.B8G8R8A8UNorm);
             TexFileHelper.Save(destination, uncompressed);
         }

LightlessSync/Services/TextureProcessingQueue.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+
+namespace LightlessSync.Services;
+
+public sealed class TextureProcessingQueue : IDisposable
+{
+    private readonly AssetProcessingQueue _queue;
+
+    public TextureProcessingQueue(ILogger<TextureProcessingQueue> logger)
+    {
+        _queue = new AssetProcessingQueue(logger, "LightlessSync.TextureProcessing");
+    }
+
+    public Task Enqueue(Func<CancellationToken, Task> work, CancellationToken token = default)
+        => _queue.Enqueue(work, token);
+
+    public void Dispose()
+        => _queue.Dispose();
+}

LightlessSync/UI/DataAnalysisUi.cs

@@ -56,6 +56,7 @@ public class DataAnalysisUi : WindowMediatorSubscriberBase
     private readonly ModelDecimationService _modelDecimationService;
     private readonly TextureCompressionService _textureCompressionService;
     private readonly TextureMetadataHelper _textureMetadataHelper;
+    private readonly TextureProcessingQueue _processingQueue;
 
     private readonly List<TextureRow> _textureRows = new();
     private readonly Dictionary<string, TextureCompressionTarget> _textureSelections = new(StringComparer.OrdinalIgnoreCase);
@@ -137,7 +138,8 @@ public class DataAnalysisUi : WindowMediatorSubscriberBase
         LightlessConfigService configService,
         PlayerPerformanceConfigService playerPerformanceConfig, TransientResourceManager transientResourceManager,
         TransientConfigService transientConfigService, ModelDecimationService modelDecimationService,
-        TextureCompressionService textureCompressionService, TextureMetadataHelper textureMetadataHelper)
+        TextureCompressionService textureCompressionService, TextureMetadataHelper textureMetadataHelper,
+        TextureProcessingQueue processingQueue)
         : base(logger, mediator, "Lightless Character Data Analysis", performanceCollectorService)
     {
         _characterAnalyzer = characterAnalyzer;
@@ -150,6 +152,7 @@ public class DataAnalysisUi : WindowMediatorSubscriberBase
         _modelDecimationService = modelDecimationService;
         _textureCompressionService = textureCompressionService;
         _textureMetadataHelper = textureMetadataHelper;
+        _processingQueue = processingQueue;
         Mediator.Subscribe<CharacterDataAnalyzedMessage>(this, (_) =>
         {
             _hasUpdate = true;
@@ -3716,7 +3719,10 @@ public class DataAnalysisUi : WindowMediatorSubscriberBase
         _conversionCurrentFileProgress = 0;
         _conversionFailed = false;
 
-        _conversionTask = RunTextureConversionAsync(requests, _conversionCancellationTokenSource.Token);
+        var conversionToken = _conversionCancellationTokenSource.Token;
+        _conversionTask = _processingQueue.Enqueue(
+            queueToken => RunTextureConversionAsync(requests, queueToken),
+            conversionToken);
         _showModal = true;
     }
 

LightlessSync/Utils/PtrGuard.cs

@@ -0,0 +1,71 @@
+using System.Runtime.InteropServices;
+using static LightlessSync.Utils.PtrGuardMemory;
+
+namespace LightlessSync.Utils
+{
+    public static partial class PtrGuard
+    {
+        private const ulong _aligmentPtr = 0x7UL;
+        private static readonly nuint _minAppAddr = (nuint)GetMinAppAddr();
+        private static readonly nuint _maxAppAddr = (nuint)GetMaxAppAddr();
+
+        private static nint GetMinAppAddr()
+        {
+            GetSystemInfo(out var si);
+            return si.lpMinimumApplicationAddress;
+        }
+
+        private static nint GetMaxAppAddr()
+        {
+            GetSystemInfo(out var si);
+            return si.lpMaximumApplicationAddress;
+        }
+
+            public static bool LooksLikePtr(nint p)
+            {
+                if (p == 0) return false;
+                nuint u = (nuint)p;
+
+                if (u < _minAppAddr) return false;
+                if (u > _maxAppAddr) return false;
+                if ((u & _aligmentPtr) != 0) return false;
+                if ((uint)u == 0x12345679u) return false;
+
+                return true;
+            }
+
+        public static bool TryReadIntPtr(nint addr, out nint value)
+        {
+            value = 0;
+            
+            if (!LooksLikePtr(addr))
+                return false;
+
+            return ReadProcessMemory(GetCurrentProcess(), addr, out value, (nuint)IntPtr.Size, out nuint bytesRead)
+                   && bytesRead == (nuint)IntPtr.Size;
+        }
+
+        public static bool IsReadable(nint addr, nuint size)
+        {
+            if (addr == 0 || size == 0) return false;
+
+            if (VirtualQuery(addr, out var mbi, (nuint)Marshal.SizeOf<MEMORY_BASIC_INFORMATION>()) == 0)
+                return false;
+
+            const uint Commit = 0x1000;
+            const uint NoAccess = 0x01;
+            const uint PageGuard = 0x100;
+
+            if (mbi.State != Commit) return false;
+            if ((mbi.Protect & PageGuard) != 0) return false;
+            if (mbi.Protect == NoAccess) return false;
+
+            ulong start = (ulong)addr;
+            ulong end = start + size - 1;
+            ulong r0 = (ulong)mbi.BaseAddress;
+            ulong r1 = r0 + mbi.RegionSize - 1;
+
+            return start >= r0 && end <= r1;
+        }
+    }
+}

LightlessSync/Utils/PtrGuardMemory.cs

@@ -0,0 +1,55 @@
+using System.Runtime.InteropServices;
+
+namespace LightlessSync.Utils
+{
+    internal static class PtrGuardMemory
+    {
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct MEMORY_BASIC_INFORMATION
+        {
+            public nint BaseAddress;
+            public nint AllocationBase;
+            public uint AllocationProtect;
+            public nuint RegionSize;
+            public uint State;
+            public uint Protect;
+            public uint Type;
+        }
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        internal static extern nuint VirtualQuery(
+            nint lpAddress,
+            out MEMORY_BASIC_INFORMATION lpBuffer,
+            nuint dwLength);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        internal static extern bool ReadProcessMemory(
+            nint hProcess,
+            nint lpBaseAddress,
+            out nint lpBuffer,
+            nuint nSize,
+            out nuint lpNumberOfBytesRead);
+
+        [DllImport("kernel32.dll")]
+        internal static extern nint GetCurrentProcess();
+
+        [DllImport("kernel32.dll")]
+        internal static extern void GetSystemInfo(out SYSTEM_INFO lpSystemInfo);
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct SYSTEM_INFO
+        {
+            public ushort wProcessorArchitecture;
+            public ushort wReserved;
+            public uint dwPageSize;
+            public nint lpMinimumApplicationAddress;
+            public nint lpMaximumApplicationAddress;
+            public nint dwActiveProcessorMask;
+            public uint dwNumberOfProcessors;
+            public uint dwProcessorType;
+            public uint dwAllocationGranularity;
+            public ushort wProcessorLevel;
+            public ushort wProcessorRevision;
+        }
+    }
+}