From dcdb10348b8f329e8c54fd7d3060f7588408c448 Mon Sep 17 00:00:00 2001
From: Connor Fitzgerald <connorwadefitzgerald@gmail.com>
Date: Sat, 18 Jan 2025 15:02:42 -0500
Subject: [PATCH] Add Flush to GL Queue::submit (#6941)

---
 wgpu-hal/src/gles/queue.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/wgpu-hal/src/gles/queue.rs b/wgpu-hal/src/gles/queue.rs
index 8896aa4ed..6f52a5d44 100644
--- a/wgpu-hal/src/gles/queue.rs
+++ b/wgpu-hal/src/gles/queue.rs
@@ -1860,6 +1860,11 @@ impl crate::Queue for super::Queue {
             .map_err(|_| crate::DeviceError::OutOfMemory)?;
         signal_fence.pending.push((signal_value, sync));
 
+        // This is extremely important. If we don't flush, the above fences may never
+        // be signaled, particularly in headless contexts. Headed contexts will
+        // often flush every so often, but headless contexts may not.
+        unsafe { gl.flush() };
+
         Ok(())
     }