From 262797f9d5c1324b874da2bb0411a7fb95f5da49 Mon Sep 17 00:00:00 2001
From: Andrew Eikum <aeikum@codeweavers.com>
Date: Mon, 13 Aug 2018 09:50:36 -0500
Subject: [PATCH] [dxgi] SetFullscreenState succeeds if not changing state

This fixes an error dialog on exiting Unreal Engine 4 games.
---
 src/dxgi/dxgi_swapchain.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/dxgi/dxgi_swapchain.cpp b/src/dxgi/dxgi_swapchain.cpp
index a55be36e..304b1bbe 100644
--- a/src/dxgi/dxgi_swapchain.cpp
+++ b/src/dxgi/dxgi_swapchain.cpp
@@ -410,9 +410,6 @@ namespace dxvk {
           IDXGIOutput*  pTarget) {
     std::lock_guard<std::mutex> lock(m_lockWindow);
     
-    if (!IsWindow(m_window))
-      return DXGI_ERROR_INVALID_CALL;
-    
     if (m_descFs.Windowed && Fullscreen)
       return this->EnterFullscreenMode(pTarget);
     else if (!m_descFs.Windowed && !Fullscreen)
@@ -522,6 +519,9 @@ namespace dxvk {
   
   HRESULT DxgiSwapChain::EnterFullscreenMode(IDXGIOutput* pTarget) {
     Com<IDXGIOutput> output = static_cast<DxgiOutput*>(pTarget);
+
+    if (!IsWindow(m_window))
+      return DXGI_ERROR_NOT_CURRENTLY_AVAILABLE;
     
     if (output == nullptr) {
       if (FAILED(GetContainingOutput(&output))) {
@@ -581,6 +581,9 @@ namespace dxvk {
   
   HRESULT DxgiSwapChain::LeaveFullscreenMode() {
     Com<IDXGIOutput> output;
+
+    if (!IsWindow(m_window))
+      return DXGI_ERROR_NOT_CURRENTLY_AVAILABLE;
     
     if (FAILED(m_adapter->GetOutputFromMonitor(m_monitor, &output))
      || FAILED(RestoreDisplayMode(output.ptr())))