From 31e95b0794ab05009a15f8a18977c400341c85a1 Mon Sep 17 00:00:00 2001
From: Swung0x48 <swung0x48@outlook.com>
Date: Sat, 19 Sep 2026 22:16:02 -0400
Subject: [PATCH] [MG_Backend] (Disaggregated): P5f fe - clarify readback
 pack-buffer boundary

---
 MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp | 3 ++-
 MobileGL/MG_Backend/DirectGLES/Utils.cpp      | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp b/MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
index bf86ced9..c4158a0f 100644
--- a/MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
+++ b/MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
@@ -65,7 +65,8 @@
 
 namespace MobileGL::MG_Backend::DirectGLES {
 #if MOBILEGL_BUILD_DISAGGREGATED
-    // read_pixels writes the server reply scratch; client-side scatter owns any PBO.
+    // read_pixels writes server reply scratch. The client refuses PACK_BUFFER before
+    // emission, so no frontend pack binding can affect this destination.
     static const SharedPtr<MG_State::GLState::BufferObject>& SplitReadbackPackBuffer() {
         static const SharedPtr<MG_State::GLState::BufferObject> none;
         return none;
diff --git a/MobileGL/MG_Backend/DirectGLES/Utils.cpp b/MobileGL/MG_Backend/DirectGLES/Utils.cpp
index e2106c7d..a5188360 100644
--- a/MobileGL/MG_Backend/DirectGLES/Utils.cpp
+++ b/MobileGL/MG_Backend/DirectGLES/Utils.cpp
@@ -38,7 +38,8 @@
 
 namespace MobileGL::MG_Backend::DirectGLES {
 #if MOBILEGL_BUILD_DISAGGREGATED
-    // read_pixels writes the server reply scratch; client-side scatter owns any PBO.
+    // read_pixels writes server reply scratch. The client refuses PACK_BUFFER before
+    // emission, so no frontend pack binding can affect this destination.
     static const SharedPtr<MG_State::GLState::BufferObject>& SplitReadbackPackBuffer() {
         static const SharedPtr<MG_State::GLState::BufferObject> none;
         return none;