yuzu-qt: Attempt to workaround broken Vulkan installations

This does a few things in order to make the default setting Vulkan
workable.

- When yuzu boots, it just opens the Vulkan library.
  - If it works, all good and we continue with Vulkan as the default.
  - If something breaks, a new file in the config directory will be left
    behind (this is deleted normally).
- If Vulkan is not working, has_broken_vulkan is set to true.
  - The first time this happens, a warning is displayed to notify the
    user.
  - This forces use of OpenGL, and Vulkan cannot be selected.
  - The Shader Backend selector is made accessible for use in custom
    configurations.
  - To disable has_broken_vulkan, the user needs to press a button in
    Graphics Configuration to manually run the Vulkan device
    enumeration.

src/yuzu/main.cpp

@@ -115,6 +115,7 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 #include "video_core/shader_notify.h"
 #include "yuzu/about_dialog.h"
 #include "yuzu/bootmanager.h"
+#include "yuzu/check_vulkan.h"
 #include "yuzu/compatdb.h"
 #include "yuzu/compatibility_list.h"
 #include "yuzu/configuration/config.h"
@@ -297,6 +298,20 @@ GMainWindow::GMainWindow()
 
     MigrateConfigFiles();
 
+    if (!CheckVulkan()) {
+        QMessageBox::warning(
+            this, tr("Broken Vulkan Installation Detected"),
+            tr("Vulkan initialization failed on the previous boot. Please update your graphics "
+               "driver, then re-check your Vulkan installation by accessing the Graphics "
+               "configuration and clicking \"Check for Working Vulkan\"."));
+    }
+    if (UISettings::values.has_broken_vulkan) {
+        Settings::values.renderer_backend = Settings::RendererBackend::OpenGL;
+
+        renderer_status_button->setDisabled(true);
+        renderer_status_button->setChecked(false);
+    }
+
 #if defined(HAVE_SDL2) && !defined(_WIN32)
     SDL_InitSubSystem(SDL_INIT_VIDEO);
     // SDL disables the screen saver by default, and setting the hint
@@ -1563,7 +1578,7 @@ void GMainWindow::ShutdownGame() {
     emu_speed_label->setVisible(false);
     game_fps_label->setVisible(false);
     emu_frametime_label->setVisible(false);
-    renderer_status_button->setEnabled(true);
+    renderer_status_button->setEnabled(!UISettings::values.has_broken_vulkan);
 
     game_path.clear();