Vulkan: trim disabled draw diagnostics overhead (#307)

src/SharpEmu.Libs/VideoOut/VulkanVideoPresenter.cs

@@ -2775,6 +2775,11 @@ internal static unsafe class VulkanVideoPresenter
 
         private void LoadDebugUtilsCommands()
         {
+            if (!_vulkanDebugUtilsEnabled)
+            {
+                return;
+            }
+
             var setObjectName = _vk.GetDeviceProcAddr(_device, "vkSetDebugUtilsObjectNameEXT");
             var beginLabel = _vk.GetDeviceProcAddr(_device, "vkCmdBeginDebugUtilsLabelEXT");
             var endLabel = _vk.GetDeviceProcAddr(_device, "vkCmdEndDebugUtilsLabelEXT");
@@ -2877,10 +2882,48 @@ internal static unsafe class VulkanVideoPresenter
             $"SharpEmu texture 0x{texture.Address:X16} {texture.Width}x{texture.Height} " +
             $"fmt{texture.Format}/{format}";
 
+        private static bool IsTitleDraw(IReadOnlyList<GuestVertexBuffer> vertexBuffers)
+        {
+            foreach (var buffer in vertexBuffers)
+            {
+                if (buffer.Location == 0 &&
+                    buffer.ComponentCount == 4 &&
+                    buffer.DataFormat == 10 &&
+                    buffer.NumberFormat == 0 &&
+                    buffer.Stride == 16 &&
+                    buffer.OffsetBytes == 12 &&
+                    buffer.Length == 67568)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool AnyTargetAddressMatches(
+            IReadOnlyList<GuestImageResource>? targets,
+            string environmentVariable)
+        {
+            if (targets is null)
+            {
+                return false;
+            }
+
+            foreach (var target in targets)
+            {
+                if (AddressListContains(environmentVariable, target.Address))
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         private void CreateInstance()
         {
             var applicationName = (byte*)SilkMarshal.StringToPtr("SharpEmu");
-            var enableValidation = Environment.GetEnvironmentVariable("SHARPEMU_VK_VALIDATION") == "1";
             byte* validationLayerName = null;
 
             try
@@ -2906,7 +2949,8 @@ internal static unsafe class VulkanVideoPresenter
                     enabledExtensions[index] = extensions[index];
                 }
 
-                if (IsInstanceExtensionAvailable(DebugUtilsExtensionName))
+                if (_vulkanDebugUtilsEnabled &&
+                    IsInstanceExtensionAvailable(DebugUtilsExtensionName))
                 {
                     debugUtilsExtension = (byte*)SilkMarshal.StringToPtr(DebugUtilsExtensionName);
                     enabledExtensions[enabledExtensionCount++] = debugUtilsExtension;
@@ -2921,11 +2965,12 @@ internal static unsafe class VulkanVideoPresenter
                     instanceCreateFlags |= InstanceCreateFlags.EnumeratePortabilityBitKhr;
                 }
 
-                if (enableValidation && IsInstanceLayerAvailable("VK_LAYER_KHRONOS_validation"))
+                if (_vulkanValidationEnabled &&
+                    IsInstanceLayerAvailable("VK_LAYER_KHRONOS_validation"))
                 {
                     validationLayerName = (byte*)SilkMarshal.StringToPtr("VK_LAYER_KHRONOS_validation");
                 }
-                else if (enableValidation)
+                else if (_vulkanValidationEnabled)
                 {
                     Console.Error.WriteLine("[LOADER][WARN] SHARPEMU_VK_VALIDATION=1 but VK_LAYER_KHRONOS_validation not found (Vulkan SDK installed?).");
                 }
@@ -4898,6 +4943,13 @@ internal static unsafe class VulkanVideoPresenter
             IReadOnlyList<GuestImageResource>? renderTargets = null,
             ulong shaderAddress = 0)
         {
+            if (!_traceGuestImagesEnabled &&
+                !_traceGuestImageAddressFilterEnabled &&
+                GuestImageTraceInterval() is null)
+            {
+                return Array.Empty<GuestImageResource>();
+            }
+
             var candidates = new HashSet<GuestImageResource>();
             foreach (var renderTarget in renderTargets ?? [])
             {
@@ -5140,47 +5192,35 @@ internal static unsafe class VulkanVideoPresenter
             bool hasDepthAttachment = false,
             GuestDepthResource? feedbackDepth = null)
         {
-            var isTitleDraw = draw.VertexBuffers.Any(buffer =>
+            var isTitleDraw = IsTitleDraw(draw.VertexBuffers);
-                buffer.Location == 0 &&
+            var forceFullscreenVertex = _forceFullscreenPipeline ||
-                buffer.ComponentCount == 4 &&
+                _forceFullscreenVertex ||
-                buffer.DataFormat == 10 &&
+                isTitleDraw && _forceTitleFullscreenVertex ||
-                buffer.NumberFormat == 0 &&
+                AnyTargetAddressMatches(
-                buffer.Stride == 16 &&
+                    feedbackTargets,
-                buffer.OffsetBytes == 12 &&
+                    "SHARPEMU_FORCE_FULLSCREEN_VERTEX_TARGETS");
-                buffer.Length == 67568);
+            var forceRasterState = _forceFullscreenPipeline ||
-            var forceFullscreenPipeline = Environment.GetEnvironmentVariable(
+                _forceDefaultRasterState ||
-                "SHARPEMU_FORCE_FULLSCREEN_PIPELINE") == "1";
+                isTitleDraw && _forceTitleDefaultRasterState ||
-            var forceFullscreenVertex = forceFullscreenPipeline ||
+                AnyTargetAddressMatches(
-                Environment.GetEnvironmentVariable(
+                    feedbackTargets,
-                    "SHARPEMU_FORCE_FULLSCREEN_VERTEX") == "1" ||
+                    "SHARPEMU_FORCE_DEFAULT_RASTER_STATE_TARGETS");
-                isTitleDraw && Environment.GetEnvironmentVariable(
-                    "SHARPEMU_FORCE_TITLE_FULLSCREEN_VERTEX") == "1" ||
-                feedbackTargets?.Any(target => AddressListContains(
-                    "SHARPEMU_FORCE_FULLSCREEN_VERTEX_TARGETS",
-                    target.Address)) == true;
-            var forceRasterState = forceFullscreenPipeline ||
-                Environment.GetEnvironmentVariable(
-                    "SHARPEMU_FORCE_DEFAULT_RASTER_STATE") == "1" ||
-                isTitleDraw && Environment.GetEnvironmentVariable(
-                    "SHARPEMU_FORCE_TITLE_DEFAULT_RASTER_STATE") == "1" ||
-                feedbackTargets?.Any(target => AddressListContains(
-                    "SHARPEMU_FORCE_DEFAULT_RASTER_STATE_TARGETS",
-                    target.Address)) == true;
             var forceTitleSolidFragment =
-                Environment.GetEnvironmentVariable(
+                _forceTitleSolidFragment &&
-                    "SHARPEMU_FORCE_TITLE_SOLID_FRAGMENT") == "1" &&
                 isTitleDraw;
-            var forceSolidFragment = forceTitleSolidFragment || forceFullscreenPipeline ||
+            var forceSolidFragment = forceTitleSolidFragment ||
-                Environment.GetEnvironmentVariable("SHARPEMU_FORCE_SOLID_FRAGMENT") == "1" ||
+                _forceFullscreenPipeline ||
-                feedbackTargets?.Any(target => AddressListContains(
+                _forceSolidFragment ||
-                    "SHARPEMU_FORCE_SOLID_FRAGMENT_TARGETS",
+                AnyTargetAddressMatches(
-                    target.Address)) == true;
+                    feedbackTargets,
-            var forceAttributeFragment = uint.TryParse(
+                    "SHARPEMU_FORCE_SOLID_FRAGMENT_TARGETS");
-                Environment.GetEnvironmentVariable("SHARPEMU_FORCE_ATTRIBUTE_FRAGMENT"),
+            var attributeFragmentLocation =
-                out var attributeFragmentLocation) &&
+                _forceAttributeFragmentLocation.GetValueOrDefault();
-                feedbackTargets?.Any(target => AddressListContains(
+            var forceAttributeFragment =
-                    "SHARPEMU_FORCE_ATTRIBUTE_FRAGMENT_TARGETS",
+                _forceAttributeFragmentLocation.HasValue &&
-                    target.Address)) == true;
+                AnyTargetAddressMatches(
+                    feedbackTargets,
+                    "SHARPEMU_FORCE_ATTRIBUTE_FRAGMENT_TARGETS");
             var vertexSpirv = forceFullscreenVertex
                 ? SpirvFixedShaders.CreateFullscreenVertex(0)
                 : draw.VertexSpirv;
@@ -5189,11 +5229,9 @@ internal static unsafe class VulkanVideoPresenter
                 : forceAttributeFragment
                     ? SpirvFixedShaders.CreateAttributeFragment(attributeFragmentLocation)
                 : draw.PixelSpirv;
-            var fixedFragmentDumpPath = Environment.GetEnvironmentVariable(
+            if (forceSolidFragment && !string.IsNullOrWhiteSpace(_fixedFragmentDumpPath))
-                "SHARPEMU_DUMP_FIXED_SOLID_FRAGMENT");
-            if (forceSolidFragment && !string.IsNullOrWhiteSpace(fixedFragmentDumpPath))
             {
-                File.WriteAllBytes(fixedFragmentDumpPath, fragmentSpirv);
+                File.WriteAllBytes(_fixedFragmentDumpPath, fragmentSpirv);
             }
             if (draw.RenderState.Blends.Count != renderTargetFormats.Count)
             {
@@ -5243,21 +5281,18 @@ internal static unsafe class VulkanVideoPresenter
                 resources.Raster = GuestRasterState.Default;
                 resources.Depth = GuestDepthState.Default;
             }
-            if (isTitleDraw && Environment.GetEnvironmentVariable(
+            if (isTitleDraw && _forceTitleDefaultBlend)
-                    "SHARPEMU_FORCE_TITLE_DEFAULT_BLEND") == "1")
             {
                 resources.Blends = Enumerable.Repeat(
                     GuestBlendState.Default,
                     renderTargetFormats.Count).ToArray();
             }
-            if (isTitleDraw && Environment.GetEnvironmentVariable(
+            if (isTitleDraw && _forceTitleDefaultViewportScissor)
-                    "SHARPEMU_FORCE_TITLE_DEFAULT_VIEWPORT_SCISSOR") == "1")
             {
                 resources.Scissor = null;
                 resources.Viewport = null;
             }
-            if (isTitleDraw && Environment.GetEnvironmentVariable(
+            if (isTitleDraw && _forceTitleDisableCull)
-                    "SHARPEMU_FORCE_TITLE_DISABLE_CULL") == "1")
             {
                 resources.Raster = resources.Raster with
                 {
@@ -5265,13 +5300,11 @@ internal static unsafe class VulkanVideoPresenter
                     CullBack = false,
                 };
             }
-            if (isTitleDraw && Environment.GetEnvironmentVariable(
+            if (isTitleDraw && _forceTitleDisableDepth)
-                    "SHARPEMU_FORCE_TITLE_DISABLE_DEPTH") == "1")
             {
                 resources.Depth = GuestDepthState.Default;
             }
-            if (isTitleDraw && Environment.GetEnvironmentVariable(
+            if (isTitleDraw && _traceTitleState)
-                    "SHARPEMU_TRACE_TITLE_STATE") == "1")
             {
                 Console.Error.WriteLine(
                     $"[LOADER][TRACE] vk.title_state " +
@@ -7874,7 +7907,7 @@ internal static unsafe class VulkanVideoPresenter
         {
             ReadOnlySpan<byte> source = guestBuffer.Data.AsSpan(0, guestBuffer.Length);
             byte[]? forcedVertexColors = null;
-            if (Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_VERTEX_COLOR_WHITE") == "1" &&
+            if (_forceTitleVertexColorWhite &&
                 guestBuffer.Location == 0 &&
                 guestBuffer.ComponentCount == 4 &&
                 guestBuffer.DataFormat == 10 &&
@@ -9400,37 +9433,67 @@ internal static unsafe class VulkanVideoPresenter
                 return;
             }
 
-            if (targetFormats
+            for (var index = 0; index < targetFormats.Length; index++)
-                .Select((format, index) => format.IsInteger && work.Draw.RenderState.Blends[index].Enable)
+            {
-                .Any(invalid => invalid))
+                if (targetFormats[index].IsInteger &&
+                    work.Draw.RenderState.Blends[index].Enable)
                 {
                     Console.Error.WriteLine(
                         "[LOADER][WARN] Vulkan skipped MRT draw with blending enabled for an integer attachment.");
                     ReturnPooledGuestData(work.Draw);
                     return;
                 }
+            }
 
-            if (!_supportsIndependentBlend &&
+            if (!_supportsIndependentBlend)
-                work.Draw.RenderState.Blends.Skip(1).Any(blend => blend != work.Draw.RenderState.Blends[0]))
+            {
+                for (var index = 1; index < work.Draw.RenderState.Blends.Count; index++)
+                {
+                    if (work.Draw.RenderState.Blends[index] !=
+                        work.Draw.RenderState.Blends[0])
                     {
                         Console.Error.WriteLine(
                             "[LOADER][WARN] Vulkan skipped MRT draw requiring unsupported independentBlend.");
                         ReturnPooledGuestData(work.Draw);
                         return;
                     }
+                }
+            }
 
-            var formats = targetFormats.Select(target => target.Format).ToArray();
+            var formats = new Format[targetFormats.Length];
+            for (var index = 0; index < targetFormats.Length; index++)
+            {
+                formats[index] = targetFormats[index].Format;
+            }
 
-            var targetAddresses = work.Targets
+            var hasStorageFeedback = false;
-                .Where(target => target.Address != 0)
+            foreach (var texture in work.Draw.Textures)
-                .Select(target => target.Address)
+            {
-                .ToHashSet();
+                if (!texture.IsStorage || texture.Address == 0)
-            if (work.Draw.Textures.Any(texture =>
+                {
-                    texture.IsStorage && targetAddresses.Contains(texture.Address)))
+                    continue;
+                }
+
+                foreach (var target in work.Targets)
+                {
+                    if (target.Address != 0 && target.Address == texture.Address)
+                    {
+                        hasStorageFeedback = true;
+                        break;
+                    }
+                }
+
+                if (hasStorageFeedback)
+                {
+                    break;
+                }
+            }
+
+            if (hasStorageFeedback)
             {
                 Console.Error.WriteLine(
                     $"[LOADER][WARN] Vulkan skipped storage render-target feedback loop " +
-                    $"targets={string.Join(',', targetAddresses.Select(address => $"0x{address:X16}"))}; " +
+                    $"targets={string.Join(',', work.Targets.Where(target => target.Address != 0).Select(target => $"0x{target.Address:X16}"))}; " +
                     "sampled aliases use ordered snapshots");
                 ReturnPooledGuestData(work.Draw);
                 return;
@@ -9802,64 +9865,34 @@ internal static unsafe class VulkanVideoPresenter
                     }
                 }
 
-                var guestWritesMode = Environment.GetEnvironmentVariable(
-                    "SHARPEMU_TRACE_GUEST_WRITES");
-                var traceAddressWriteOrdinal = 0L;
-                _ = long.TryParse(
-                    Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_WRITE_ORDINAL"),
-                    out traceAddressWriteOrdinal);
-                var traceLargeWriteOrdinal = 0L;
-                if (guestWritesMode is not null &&
-                    guestWritesMode.StartsWith("large@", StringComparison.Ordinal) &&
-                    long.TryParse(
-                        guestWritesMode.AsSpan("large@".Length),
-                        out var parsedTraceLargeWriteOrdinal) &&
-                    parsedTraceLargeWriteOrdinal > 0)
-                {
-                    traceLargeWriteOrdinal = parsedTraceLargeWriteOrdinal;
-                }
-
                 var tracePixelSpirv = false;
-                if (int.TryParse(
+                if (_tracePixelSpirvBytes > 0 &&
-                        Environment.GetEnvironmentVariable("SHARPEMU_TRACE_PIXEL_SPIRV_BYTES"),
+                    _tracePixelSpirvBytes == work.Draw.PixelSpirv.Length)
-                        out var tracePixelSpirvBytes) &&
-                    tracePixelSpirvBytes == work.Draw.PixelSpirv.Length)
                 {
                     var pixelWriteCount = _pixelSpirvWriteCounts.TryGetValue(
-                        tracePixelSpirvBytes,
+                        _tracePixelSpirvBytes,
                         out var previousPixelWriteCount)
                             ? previousPixelWriteCount + 1
                             : 1;
-                    _pixelSpirvWriteCounts[tracePixelSpirvBytes] = pixelWriteCount;
+                    _pixelSpirvWriteCounts[_tracePixelSpirvBytes] = pixelWriteCount;
-                    var tracePixelSpirvOccurrence = 1;
-                    _ = int.TryParse(
-                        Environment.GetEnvironmentVariable(
-                            "SHARPEMU_TRACE_PIXEL_SPIRV_OCCURRENCE"),
-                        out tracePixelSpirvOccurrence);
                     tracePixelSpirv =
-                        pixelWriteCount == Math.Max(tracePixelSpirvOccurrence, 1);
+                        pixelWriteCount == _tracePixelSpirvOccurrence;
                 }
                 var traceTitleDraw =
                     !_tracedTitleDraw &&
-                    Environment.GetEnvironmentVariable("SHARPEMU_TRACE_TITLE_DRAW") == "1" &&
+                    _traceTitleDrawEnabled &&
-                    work.Draw.VertexBuffers.Any(buffer =>
+                    IsTitleDraw(work.Draw.VertexBuffers);
-                        buffer.Location == 0 &&
-                        buffer.ComponentCount == 4 &&
-                        buffer.DataFormat == 10 &&
-                        buffer.NumberFormat == 0 &&
-                        buffer.Stride == 16 &&
-                        buffer.OffsetBytes == 12 &&
-                        buffer.Length == 67568);
                 _tracedTitleDraw |= traceTitleDraw;
 
                 foreach (var target in targets)
                 {
                     var traceAddressWrite =
                         ShouldTraceGuestImageWriteForDiagnostics(target.Address);
-                    var traceSmallWrites = guestWritesMode == "small" &&
+                    var traceSmallWrites = _traceGuestWritesMode == "small" &&
                         target.Width <= 512 && target.Height <= 256;
                     var traceLargeWrites =
-                        (guestWritesMode == "large" || traceLargeWriteOrdinal != 0) &&
+                        (_traceGuestWritesMode == "large" ||
+                         _traceLargeGuestWriteOrdinal != 0) &&
                         target.Width >= 2560 && target.Height >= 1440;
                     if (traceAddressWrite || traceSmallWrites ||
                         traceLargeWrites || tracePixelSpirv || traceTitleDraw)
@@ -9872,10 +9905,10 @@ internal static unsafe class VulkanVideoPresenter
                         _tracedGuestWriteCounts[target.Address] = writeCount;
                         var shouldTraceWrite = tracePixelSpirv || traceTitleDraw
                             ? true
-                            : traceAddressWrite && traceAddressWriteOrdinal > 0
+                            : traceAddressWrite && _traceGuestWriteOrdinal > 0
-                                ? writeCount == traceAddressWriteOrdinal
+                                ? writeCount == _traceGuestWriteOrdinal
-                            : traceLargeWriteOrdinal != 0
+                            : _traceLargeGuestWriteOrdinal != 0
-                                ? writeCount == traceLargeWriteOrdinal
+                                ? writeCount == _traceLargeGuestWriteOrdinal
                             : writeCount <=
                                 (traceLargeWrites ? 2 : traceSmallWrites ? 48 : 3);
                         if (traceAddressWrite || shouldTraceWrite)
@@ -12849,6 +12882,20 @@ internal static unsafe class VulkanVideoPresenter
         // Diagnostics toggles are read once: these run per draw / per cached
         // texture hit, and env lookups plus string parsing are far too
         // expensive there (and non-trivially so under Rosetta 2).
+        private static readonly bool _vulkanValidationEnabled =
+            string.Equals(
+                Environment.GetEnvironmentVariable("SHARPEMU_VK_VALIDATION"),
+                "1",
+                StringComparison.Ordinal);
+        // Object names and command labels are useful in RenderDoc and validation
+        // captures, but formatting them and calling the debug-utils driver hooks
+        // for every draw is measurable overhead in normal gameplay.
+        private static readonly bool _vulkanDebugUtilsEnabled =
+            _vulkanValidationEnabled ||
+            string.Equals(
+                Environment.GetEnvironmentVariable("SHARPEMU_VK_DEBUG_LABELS"),
+                "1",
+                StringComparison.Ordinal);
         private static readonly string? _traceGuestImagesMode =
             Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_IMAGES");
         private static readonly bool _traceGuestImagesEnabled =
@@ -12912,10 +12959,80 @@ internal static unsafe class VulkanVideoPresenter
             !string.IsNullOrWhiteSpace(
                 Environment.GetEnvironmentVariable(
                     "SHARPEMU_TRACE_GUEST_IMAGE_ADDRS"));
+        private static readonly bool _forceFullscreenPipeline =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_FULLSCREEN_PIPELINE") == "1";
+        private static readonly bool _forceFullscreenVertex =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_FULLSCREEN_VERTEX") == "1";
+        private static readonly bool _forceTitleFullscreenVertex =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_FULLSCREEN_VERTEX") == "1";
+        private static readonly bool _forceDefaultRasterState =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_DEFAULT_RASTER_STATE") == "1";
+        private static readonly bool _forceTitleDefaultRasterState =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_DEFAULT_RASTER_STATE") == "1";
+        private static readonly bool _forceTitleSolidFragment =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_SOLID_FRAGMENT") == "1";
+        private static readonly bool _forceSolidFragment =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_SOLID_FRAGMENT") == "1";
+        private static readonly uint? _forceAttributeFragmentLocation =
+            uint.TryParse(
+                Environment.GetEnvironmentVariable("SHARPEMU_FORCE_ATTRIBUTE_FRAGMENT"),
+                out var forceAttributeFragmentLocation)
+                    ? forceAttributeFragmentLocation
+                    : null;
+        private static readonly string? _fixedFragmentDumpPath =
+            Environment.GetEnvironmentVariable("SHARPEMU_DUMP_FIXED_SOLID_FRAGMENT");
+        private static readonly bool _forceTitleDefaultBlend =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_DEFAULT_BLEND") == "1";
+        private static readonly bool _forceTitleDefaultViewportScissor =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_DEFAULT_VIEWPORT_SCISSOR") == "1";
+        private static readonly bool _forceTitleDisableCull =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_DISABLE_CULL") == "1";
+        private static readonly bool _forceTitleDisableDepth =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_DISABLE_DEPTH") == "1";
+        private static readonly bool _traceTitleState =
+            Environment.GetEnvironmentVariable("SHARPEMU_TRACE_TITLE_STATE") == "1";
+        private static readonly bool _forceTitleVertexColorWhite =
+            Environment.GetEnvironmentVariable("SHARPEMU_FORCE_TITLE_VERTEX_COLOR_WHITE") == "1";
+        private static readonly bool _chunkedDrawsEnabled =
+            Environment.GetEnvironmentVariable("SHARPEMU_ENABLE_CHUNKED_DRAWS") == "1";
+        private static readonly string? _traceGuestWritesMode =
+            Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_WRITES");
+        private static readonly long _traceGuestWriteOrdinal =
+            long.TryParse(
+                Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_WRITE_ORDINAL"),
+                out var traceGuestWriteOrdinal)
+                    ? traceGuestWriteOrdinal
+                    : 0;
+        private static readonly long _traceLargeGuestWriteOrdinal =
+            ParseTraceLargeGuestWriteOrdinal(_traceGuestWritesMode);
+        private static readonly int _tracePixelSpirvBytes =
+            int.TryParse(
+                Environment.GetEnvironmentVariable("SHARPEMU_TRACE_PIXEL_SPIRV_BYTES"),
+                out var tracePixelSpirvBytes)
+                    ? tracePixelSpirvBytes
+                    : 0;
+        private static readonly int _tracePixelSpirvOccurrence =
+            int.TryParse(
+                Environment.GetEnvironmentVariable("SHARPEMU_TRACE_PIXEL_SPIRV_OCCURRENCE"),
+                out var tracePixelSpirvOccurrence)
+                    ? Math.Max(tracePixelSpirvOccurrence, 1)
+                    : 1;
+        private static readonly bool _traceTitleDrawEnabled =
+            Environment.GetEnvironmentVariable("SHARPEMU_TRACE_TITLE_DRAW") == "1";
         private static readonly System.Collections.Concurrent.ConcurrentDictionary<
             string,
             (bool Wildcard, ulong[] Addresses)> _cachedAddressLists = new();
 
+        private static long ParseTraceLargeGuestWriteOrdinal(string? mode)
+        {
+            return mode is not null &&
+                mode.StartsWith("large@", StringComparison.Ordinal) &&
+                long.TryParse(mode.AsSpan("large@".Length), out var ordinal) &&
+                ordinal > 0
+                    ? ordinal
+                    : 0;
+        }
+
         private static bool ShouldTraceGuestImageContentsForDiagnostics() =>
             _traceGuestImagesEnabled;
 
@@ -13113,8 +13230,7 @@ internal static unsafe class VulkanVideoPresenter
             // MoltenVK this starves the render thread and makes the guest fall
             // behind its own flip queue. Vulkan clips a normal fullscreen draw
             // efficiently; keep tiling only as an explicit driver diagnostic.
-            var maxPixelsPerDraw = Environment.GetEnvironmentVariable(
+            var maxPixelsPerDraw = _chunkedDrawsEnabled
-                "SHARPEMU_ENABLE_CHUNKED_DRAWS") == "1"
                 ? 512u * 512u
                 : uint.MaxValue;
             var rowsPerDraw = Math.Max(