[dxvk] Introduce config option to enable FSE on Windows

dxvk.conf

@@ -18,6 +18,18 @@
 # dxgi.enableHDR = True
 
 
+# Allows the Vulkan driver to opt-in to exclusive full-screen mode on
+# Windows. Certain features, such as variable refresh rate or HDR, will
+# not work without this setting, however enabling it will break certain
+# games that use additional GDI windows, and it will also break alt+tab.
+#
+# This setting has no effect on non-Windows platforms.
+#
+# Supported values: True, False
+
+# dxvk.allowFse = False
+
+
 # Enables Unreal Engine 4 HDR workarounds for games that do not follow
 # the standard -Win64-Shipping.exe naming scheme. May be needed to avoid
 # crashes in D3D11 games on HDR-enabled systems due to statically linked

src/dxvk/dxvk_options.cpp

@@ -14,6 +14,7 @@ namespace dxvk {
     tearFree              = config.getOption<Tristate>("dxvk.tearFree",               Tristate::Auto);
     hideIntegratedGraphics = config.getOption<bool>   ("dxvk.hideIntegratedGraphics", false);
     zeroMappedMemory      = config.getOption<bool>    ("dxvk.zeroMappedMemory",       false);
+    allowFse              = config.getOption<bool>    ("dxvk.allowFse",               false);
     deviceFilter          = config.getOption<std::string>("dxvk.deviceFilter",        "");
   }
 

src/dxvk/dxvk_options.h

@@ -45,6 +45,9 @@ namespace dxvk {
     /// Clears all mapped memory to zero.
     bool zeroMappedMemory = false;
 
+    /// Allows full-screen exclusive mode on Windows
+    bool allowFse = false;
+
     // Device name
     std::string deviceFilter;
   };

src/dxvk/dxvk_presenter.cpp

@@ -14,6 +14,13 @@ namespace dxvk {
   : m_device(device), m_signal(signal),
     m_vki(device->instance()->vki()),
     m_vkd(device->vkd()) {
+    // Only enable FSE if the user explicitly opts in. On Windows, FSE
+    // is required to support VRR or HDR, but blocks alt-tabbing or
+    // overlapping windows, which breaks a number of games.
+    m_fullscreenMode = m_device->config().allowFse
+      ? VK_FULL_SCREEN_EXCLUSIVE_ALLOWED_EXT
+      : VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+
     // If a frame signal was provided, launch thread that synchronizes
     // with present operations and periodically signals the event
     if (m_device->features().khrPresentWait.presentWait && m_signal != nullptr)
@@ -171,7 +178,7 @@ namespace dxvk {
       return VK_ERROR_SURFACE_LOST_KHR;
 
     VkSurfaceFullScreenExclusiveInfoEXT fullScreenExclusiveInfo = { VK_STRUCTURE_TYPE_SURFACE_FULL_SCREEN_EXCLUSIVE_INFO_EXT };
-    fullScreenExclusiveInfo.fullScreenExclusive = VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+    fullScreenExclusiveInfo.fullScreenExclusive = m_fullscreenMode;
 
     VkPhysicalDeviceSurfaceInfo2KHR surfaceInfo = { VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SURFACE_INFO_2_KHR };
     surfaceInfo.surface = m_surface;
@@ -300,7 +307,7 @@ namespace dxvk {
     m_info.imageCount = pickImageCount(minImageCount, maxImageCount, desc.imageCount);
 
     VkSurfaceFullScreenExclusiveInfoEXT fullScreenInfo = { VK_STRUCTURE_TYPE_SURFACE_FULL_SCREEN_EXCLUSIVE_INFO_EXT };
-    fullScreenInfo.fullScreenExclusive = VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+    fullScreenInfo.fullScreenExclusive = m_fullscreenMode;
 
     VkSwapchainPresentModesCreateInfoEXT modeInfo = { VK_STRUCTURE_TYPE_SWAPCHAIN_PRESENT_MODES_CREATE_INFO_EXT };
     modeInfo.presentModeCount       = compatibleModes.size();
@@ -457,7 +464,7 @@ namespace dxvk {
     uint32_t numFormats = 0;
 
     VkSurfaceFullScreenExclusiveInfoEXT fullScreenInfo = { VK_STRUCTURE_TYPE_SURFACE_FULL_SCREEN_EXCLUSIVE_INFO_EXT };
-    fullScreenInfo.fullScreenExclusive = VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+    fullScreenInfo.fullScreenExclusive = m_fullscreenMode;
 
     VkPhysicalDeviceSurfaceInfo2KHR surfaceInfo = { VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SURFACE_INFO_2_KHR, &fullScreenInfo };
     surfaceInfo.surface = m_surface;
@@ -499,7 +506,7 @@ namespace dxvk {
     uint32_t numModes = 0;
 
     VkSurfaceFullScreenExclusiveInfoEXT fullScreenInfo = { VK_STRUCTURE_TYPE_SURFACE_FULL_SCREEN_EXCLUSIVE_INFO_EXT };
-    fullScreenInfo.fullScreenExclusive = VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+    fullScreenInfo.fullScreenExclusive = m_fullscreenMode;
 
     VkPhysicalDeviceSurfaceInfo2KHR surfaceInfo = { VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SURFACE_INFO_2_KHR, &fullScreenInfo };
     surfaceInfo.surface = m_surface;

src/dxvk/dxvk_presenter.h

@@ -238,6 +238,8 @@ namespace dxvk {
     VkSurfaceKHR      m_surface     = VK_NULL_HANDLE;
     VkSwapchainKHR    m_swapchain   = VK_NULL_HANDLE;
 
+    VkFullScreenExclusiveEXT m_fullscreenMode = VK_FULL_SCREEN_EXCLUSIVE_DISALLOWED_EXT;
+
     std::vector<PresenterImage> m_images;
     std::vector<PresenterSync>  m_semaphores;