From cb5f8aa392a12da20aecc697778e86b123a382fe Mon Sep 17 00:00:00 2001
From: Robin Kertels <robin.kertels@gmail.com>
Date: Fri, 19 Mar 2021 01:55:05 +0100
Subject: [PATCH] [d3d9] Properly scale dirty box

---
 src/d3d9/d3d9_device.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 47614cd8..7dd2af65 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -3980,7 +3980,18 @@ namespace dxvk {
       Flags &= ~D3DLOCK_DISCARD;
 
     if (!(Flags & D3DLOCK_NO_DIRTY_UPDATE) && !(Flags & D3DLOCK_READONLY)) {
+      if (pBox && MipLevel != 0) {
+        D3DBOX scaledBox = *pBox;
+        scaledBox.Left   <<= MipLevel;
+        scaledBox.Right    = std::min(scaledBox.Right << MipLevel, pResource->Desc()->Width);
+        scaledBox.Top    <<= MipLevel;
+        scaledBox.Bottom   = std::min(scaledBox.Bottom << MipLevel, pResource->Desc()->Height);
+        scaledBox.Back   <<= MipLevel;
+        scaledBox.Front    = std::min(scaledBox.Front << MipLevel, pResource->Desc()->Depth);
+        pResource->AddDirtyBox(&scaledBox, Face);
+      } else {
         pResource->AddDirtyBox(pBox, Face);
+      }
     }
 
     auto& desc = *(pResource->Desc());