From a03c038f031a667bb571c6935c5729884b33510a Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Sat, 12 Feb 2022 15:30:38 +0100
Subject: [PATCH] [d3d9] Exit early in ProcessVertices if the vertex count is 0

We don't want to pass a zero-sized copy to the backend.
---
 src/d3d9/d3d9_device.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index b531f46a..bc11b0a9 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -2598,6 +2598,9 @@ namespace dxvk {
       return D3D_OK;
     }
 
+    if (!VertexCount)
+      return D3D_OK;
+
     D3D9CommonBuffer* dst  = static_cast<D3D9VertexBuffer*>(pDestBuffer)->GetCommonBuffer();
     D3D9VertexDecl*   decl = static_cast<D3D9VertexDecl*>  (pVertexDecl);