From 632812b88f8c1416232524c4e5dc8bf3ddfd720f Mon Sep 17 00:00:00 2001
From: Joshua Ashton <joshua@froggi.es>
Date: Fri, 28 Feb 2020 01:39:52 +0000
Subject: [PATCH] [d3d9] Disallow additional fullscreen swapchains

From Wine tests...
---
 src/d3d9/d3d9_device.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index e3298247..5fa98f80 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -3436,6 +3436,10 @@ namespace dxvk {
     if (ppSwapChain == nullptr || pPresentationParameters == nullptr)
       return D3DERR_INVALIDCALL;
 
+    // Additional fullscreen swapchains are forbidden.
+    if (!pPresentationParameters->Windowed)
+      return D3DERR_INVALIDCALL;
+
     m_implicitSwapchain->Invalidate(pPresentationParameters->hDeviceWindow);
 
     try {