From ea1241af80cbe4116c1e9764430da94bd85d6a44 Mon Sep 17 00:00:00 2001
From: Corentin Wallez <cwallez@chromium.org>
Date: Mon, 17 Jul 2017 18:27:21 -0400
Subject: [PATCH] D3D12: Handle MapReadAsync offset

---
 src/backend/d3d12/BufferD3D12.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/d3d12/BufferD3D12.cpp b/src/backend/d3d12/BufferD3D12.cpp
index 05f2f3b31a..f7baa54af8 100644
--- a/src/backend/d3d12/BufferD3D12.cpp
+++ b/src/backend/d3d12/BufferD3D12.cpp
@@ -145,7 +145,7 @@ namespace d3d12 {
         ASSERT_SUCCESS(resource->Map(0, &readRange, reinterpret_cast<void**>(&data)));
 
         MapReadRequestTracker* tracker = ToBackend(GetDevice())->GetMapReadRequestTracker();
-        tracker->Track(this, serial, data);
+        tracker->Track(this, serial, data + start);
     }
 
     void Buffer::UnmapImpl() {