yuzu: Implement Vulkan frontend

Adds a Qt and SDL2 frontend for Vulkan. It also finishes the missing
bits on Vulkan initialization.

src/yuzu_tester/emu_window/emu_window_sdl2_hide.cpp

@@ -5,10 +5,15 @@
 #include <algorithm>
 #include <cstdlib>
 #include <string>
+
+#include <fmt/format.h>
+
 #define SDL_MAIN_HANDLED
 #include <SDL.h>
-#include <fmt/format.h>
+
 #include <glad/glad.h>
+
+#include "common/assert.h"
 #include "common/logging/log.h"
 #include "common/scm_rev.h"
 #include "core/settings.h"
@@ -120,3 +125,11 @@ void EmuWindow_SDL2_Hide::MakeCurrent() {
 void EmuWindow_SDL2_Hide::DoneCurrent() {
     SDL_GL_MakeCurrent(render_window, nullptr);
 }
+
+bool EmuWindow_SDL2_Hide::IsShown() const {
+    return false;
+}
+
+void EmuWindow_SDL2_Hide::RetrieveVulkanHandlers(void*, void*, void*) const {
+    UNREACHABLE();
+}

src/yuzu_tester/emu_window/emu_window_sdl2_hide.h

@@ -25,6 +25,13 @@ public:
     /// Releases the GL context from the caller thread
     void DoneCurrent() override;
 
+    /// Whether the screen is being shown or not.
+    bool IsShown() const override;
+
+    /// Retrieves Vulkan specific handlers from the window
+    void RetrieveVulkanHandlers(void* get_instance_proc_addr, void* instance,
+                                void* surface) const override;
+
     /// Whether the window is still open, and a close request hasn't yet been sent
     bool IsOpen() const;