From 551add7519c5e28f05cfc6dc29f7accd74a9bd4e Mon Sep 17 00:00:00 2001
From: Doris Wu <doriswu@google.com>
Date: Tue, 24 Feb 2026 06:20:03 +0800
Subject: [PATCH] call execute() under single threaded mode (#9738)

---
 filament/src/details/Engine.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/filament/src/details/Engine.cpp b/filament/src/details/Engine.cpp
index 4010eb30db..d1fa557120 100644
--- a/filament/src/details/Engine.cpp
+++ b/filament/src/details/Engine.cpp
@@ -798,6 +798,12 @@ void FEngine::submitFrame() {
 void FEngine::flush() {
     // flush the command buffer
     flushCommandBuffer(mCommandBufferQueue);
+    
+    // In single-threaded mode, we have to call execute() to drain the command
+    // buffer to really free up space
+    if constexpr (!UTILS_HAS_THREADING) {
+        execute();
+    }
 }
 
 void FEngine::flushAndWait() {