From 738fd4f895627fdc60a3753a21ab344ca7cc24b9 Mon Sep 17 00:00:00 2001
From: Robin Kertels <robin.kertels@gmail.com>
Date: Thu, 15 Feb 2024 00:03:55 +0100
Subject: [PATCH] [d3d9] Don't actually unbind buffers

---
 src/d3d9/d3d9_device.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index a5fc7f5d..76f59d1e 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -3254,6 +3254,11 @@ namespace dxvk {
 
       vbo.offset = OffsetInBytes;
       vbo.stride = Stride;
+    } else {
+      // D3D9 doesn't actually unbind any vertex buffer when passing null.
+      // Operation Flashpoint: Red River relies on this behavior.
+      needsUpdate = false;
+      vbo.offset = 0;
     }
 
     if (needsUpdate)
@@ -3359,7 +3364,8 @@ namespace dxvk {
 
     m_state.indices = buffer;
 
-    BindIndices();
+    if (buffer != nullptr)
+      BindIndices();
 
     return D3D_OK;
   }