From 8cdec15fa64c365260660039373080762dbefe0d Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 27 Jun 2025 15:41:48 +0200
Subject: [PATCH] Fix `GlobalSignDistanceFieldCustomBuffer` to be thread-safe
 (scene rendering events are not guarded via mutex anymore)

---
 Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp b/Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp
index a46568f97..56dd196a5 100644
--- a/Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp
+++ b/Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp
@@ -197,6 +197,7 @@ public:
     GPUTexture* Texture = nullptr;
     GPUTexture* TextureMip = nullptr;
     Vector3 Origin = Vector3::Zero;
+    ConcurrentSystemLocker Locker;
     Array<CascadeData, FixedAllocation<4>> Cascades;
     HashSet<ScriptingTypeHandle> ObjectTypes;
     HashSet<GPUTexture*> SDFTextures;
@@ -395,6 +396,7 @@ public:
     {
         if (GLOBAL_SDF_ACTOR_IS_STATIC(a) && ObjectTypes.Contains(a->GetTypeHandle()))
         {
+            ConcurrentSystemLocker::WriteScope lock(Locker);
             OnSceneRenderingDirty(a->GetBox());
         }
     }
@@ -403,6 +405,7 @@ public:
     {
         if (GLOBAL_SDF_ACTOR_IS_STATIC(a) && ObjectTypes.Contains(a->GetTypeHandle()))
         {
+            ConcurrentSystemLocker::WriteScope lock(Locker);
             OnSceneRenderingDirty(BoundingBox::FromSphere(prevBounds));
             OnSceneRenderingDirty(a->GetBox());
         }
@@ -412,6 +415,7 @@ public:
     {
         if (GLOBAL_SDF_ACTOR_IS_STATIC(a) && ObjectTypes.Contains(a->GetTypeHandle()))
         {
+            ConcurrentSystemLocker::WriteScope lock(Locker);
             OnSceneRenderingDirty(a->GetBox());
         }
     }