From 38afbe3d4a3c81472d089d56b4735b1328632711 Mon Sep 17 00:00:00 2001
From: Julian Ramirez Ruiseco <julian@fslabs.ca>
Date: Sun, 4 Oct 2026 17:27:12 -0400
Subject: [PATCH] Use borrowed WASM slices for WebGPU buffer writes

---
 wgpu/src/backend/webgpu.rs | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/wgpu/src/backend/webgpu.rs b/wgpu/src/backend/webgpu.rs
index a8b976a185d..29523d49240 100644
--- a/wgpu/src/backend/webgpu.rs
+++ b/wgpu/src/backend/webgpu.rs
@@ -2512,20 +2512,13 @@ impl dispatch::QueueInterface for WebQueue {
         data: &[u8],
     ) {
         let buffer = buffer.as_webgpu();
-        /* Skip the copy once gecko allows BufferSource instead of ArrayBuffer
-        self.inner.write_buffer_with_f64_and_u8_array_and_f64_and_f64(
-            &buffer.buffer,
-            offset as f64,
-            data,
-            0f64,
-            data.len() as f64,
-        );
-        */
+        // writeBuffer snapshots the source synchronously. The slice binding passes a
+        // view of WASM memory, so no intermediate JavaScript allocation is needed.
         self.inner
-            .write_buffer_with_f64_and_buffer_source_and_f64_and_f64(
+            .write_buffer_with_f64_and_u8_slice_and_f64_and_f64(
                 &buffer.inner,
                 offset as f64,
-                &js_sys::Uint8Array::from(data).buffer(),
+                data,
                 0f64,
                 data.len() as f64,
             )