D3D11HostDisplay: Add an option to force a blit/discard swap chain

src/duckstation-qt/advancedsettingswidget.cpp

@@ -175,6 +175,10 @@ AdvancedSettingsWidget::AdvancedSettingsWidget(QtHostInterface* host_interface,
                          0);
   addBooleanTweakOption(m_host_interface, m_ui.tweakOptionTable, tr("Increase Timer Resolution"), "Main",
                         "IncreaseTimerResolution", true);
+#ifdef WIN32
+  addBooleanTweakOption(m_host_interface, m_ui.tweakOptionTable, tr("Use Blit Swap Chain"), "Display",
+                        "UseBlitSwapChain", false);
+#endif
 }
 
 AdvancedSettingsWidget::~AdvancedSettingsWidget() = default;
@@ -195,4 +199,7 @@ void AdvancedSettingsWidget::onResetToDefaultClicked()
   setBooleanTweakOption(m_ui.tweakOptionTable, 11, false);
   setIntRangeTweakOption(m_ui.tweakOptionTable, 12, 0);
   setBooleanTweakOption(m_ui.tweakOptionTable, 13, true);
+#ifdef WIN32
+  setBooleanTweakOption(m_ui.tweakOptionTable, 14, false);
+#endif
 }

src/frontend-common/d3d11_host_display.cpp

@@ -394,7 +394,8 @@ bool D3D11HostDisplay::CreateSwapChain(const DXGI_MODE_DESC* fullscreen_mode)
   if (m_window_info.type != WindowInfo::Type::Win32)
     return false;
 
-  m_using_flip_model_swap_chain = true;
+  m_using_flip_model_swap_chain =
+    fullscreen_mode || !g_host_interface->GetBoolSettingValue("Display", "UseBlitSwapChain", false);
 
   const HWND window_hwnd = reinterpret_cast<HWND>(m_window_info.window_handle);
   RECT client_rc{};