From 3145020a62895548881dbb1886d46f191191124a Mon Sep 17 00:00:00 2001
From: Robin Kertels <robin.kertels@gmail.com>
Date: Fri, 21 Jun 2024 12:34:08 +0200
Subject: [PATCH] [d3d9] Only change vertex offset draw parameters when
 necessary

... Only change it when the vertex data is actually dynamically uploaded.
---
 src/d3d9/d3d9_device.cpp | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 776dedb56..023322ef6 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -5307,11 +5307,13 @@ namespace dxvk {
       m_flags.set(D3D9DeviceFlag::DirtyVertexBuffers);
     }
 
-    // Change the draw call parameters to reflect the changed vertex buffers
-    if (NumIndices != 0) {
-      BaseVertexIndex = -FirstVertexIndex;
-    } else {
-      FirstVertexIndex = 0;
+    if (dynamicSysmemVBOs) {
+      // Change the draw call parameters to reflect the changed vertex buffers
+      if (NumIndices != 0) {
+        BaseVertexIndex = -FirstVertexIndex;
+      } else {
+        FirstVertexIndex = 0;
+      }
     }
 
     if (dynamicSysmemIBO) {