From 3587bcdb9f68841dc8bcf2697a174db1f7d9070b Mon Sep 17 00:00:00 2001
From: Joshua Ashton <joshua@froggi.es>
Date: Fri, 28 Feb 2020 01:43:07 +0000
Subject: [PATCH] [d3d9] Disallow creating additional swapchains if we are
 fullscreen

From Wine tests...
---
 src/d3d9/d3d9_device.cpp  | 4 ++++
 src/d3d9/d3d9_swapchain.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 5fa98f80..8a22031c 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -3440,6 +3440,10 @@ namespace dxvk {
     if (!pPresentationParameters->Windowed)
       return D3DERR_INVALIDCALL;
 
+    // We can't make another swapchain if we are fullscreen.
+    if (!m_implicitSwapchain->GetPresentParams()->Windowed)
+      return D3DERR_INVALIDCALL;
+
     m_implicitSwapchain->Invalidate(pPresentationParameters->hDeviceWindow);
 
     try {
diff --git a/src/d3d9/d3d9_swapchain.h b/src/d3d9/d3d9_swapchain.h
index 00dd6e3b..c4350a02 100644
--- a/src/d3d9/d3d9_swapchain.h
+++ b/src/d3d9/d3d9_swapchain.h
@@ -83,6 +83,8 @@ namespace dxvk {
 
     D3D9Surface* GetBackBuffer(UINT iBackBuffer);
 
+    const D3DPRESENT_PARAMETERS* GetPresentParams() const { return &m_presentParams; }
+
   private:
 
     enum BindingIds : uint32_t {