Hydrogent: disable parallel syncing of ext computations on Web

DiligentGraphics · Sep 22, 2024 · b9ce361 · b9ce361
1 parent 1a46424
commit b9ce361
Showing 1 changed file with 15 additions and 4 deletions.
diff --git a/Hydrogent/src/HnRenderDelegate.cpp b/Hydrogent/src/HnRenderDelegate.cpp
@@ -679,10 +679,21 @@ void HnRenderDelegate::CommitResources(pxr::HdChangeTracker* tracker)
 
 bool HnRenderDelegate::IsParallelSyncEnabled(pxr::TfToken primType) const
 {
-    return (primType == pxr::HdPrimTypeTokens->mesh ||
-            primType == pxr::HdPrimTypeTokens->material ||
-            primType == pxr::HdPrimTypeTokens->camera ||
-            primType == pxr::HdPrimTypeTokens->extComputation);
+    bool ParallelSyncEnabled = (primType == pxr::HdPrimTypeTokens->mesh ||
+                                primType == pxr::HdPrimTypeTokens->material ||
+                                primType == pxr::HdPrimTypeTokens->camera ||
+                                primType == pxr::HdPrimTypeTokens->extComputation);
+
+#if PLATFORM_EMSCRIPTEN
+    if (primType == pxr::HdPrimTypeTokens->extComputation)
+    {
+        // On Emscripten, parallel syncing of ext computations is several times slower
+        // due to memory allocation overhead.
+        ParallelSyncEnabled = false;
+    }
+#endif
+
+    return ParallelSyncEnabled;
 }
 
 const pxr::SdfPath* HnRenderDelegate::GetRPrimId(Uint32 UID) const