Qt: Check version of created OpenGL context

src/platform/qt/src/main.cpp

@@ -48,6 +48,9 @@ auto create_window(QApplication& app, int argc, char** argv) -> std::unique_ptr<
   }
 
   auto window = std::make_unique<MainWindow>(&app);
+  if(!window->Initialize()) {
+    return nullptr;
+  }
 
   if(!rom.empty()) {
     window->LoadROM(rom.u16string());
@@ -104,6 +107,9 @@ int main(int argc, char** argv) {
   QGuiApplication::setDesktopFileName("io.github.nba_emuNanoBoyAdvance");
 
   auto window = create_window(app, argc, argv);
+  if(!window) {
+    return EXIT_FAILURE;
+  }
 
   return app.exec();
 }

src/platform/qt/src/widget/main_window.cpp

@@ -45,8 +45,6 @@ MainWindow::MainWindow(
 
   screen = std::make_shared<Screen>(this, config);
   setCentralWidget(screen.get());
-  screen->windowHandle()->create();
-  screen->Initialize();
 
   auto menu_bar = new QMenuBar(this);
   setMenuBar(menu_bar);
@@ -93,6 +91,19 @@ MainWindow::~MainWindow() {
   delete controller_manager;
 }
 
+bool MainWindow::Initialize() {
+  screen->windowHandle()->create();
+  if(!screen->Initialize()) {
+    QMessageBox::critical(this, QApplication::instance()->applicationName(),
+                          tr("Failed to initialize graphics subsystem.\n\n"
+                          "Make sure that your hardware supports OpenGL 3.3 or later, "
+                          "and you have the latest driver version installed."));
+    return false;
+  }
+
+  return true;
+}
+
 void MainWindow::CreateFileMenu() {
   auto file_menu = menuBar()->addMenu(tr("File"));
 

src/platform/qt/src/widget/main_window.hpp

@@ -39,6 +39,7 @@ struct MainWindow : QMainWindow {
 
  ~MainWindow();
 
+  bool Initialize();
   void LoadROM(std::u16string const& path);
 
 signals:

src/platform/qt/src/widget/screen.cpp

@@ -28,15 +28,38 @@ static auto get_proc_address(const char* proc_name) {
   return QOpenGLContext::currentContext()->getProcAddress(proc_name);
 }
 
-void Screen::Initialize() {
+bool Screen::Initialize() {
   context = new QOpenGLContext();
-  context->create();
-  context->makeCurrent(this->windowHandle());
+  if(!context->create()) {
+    delete context;
+    context = nullptr;
+    return false;
+  }
+  if(context->format().majorVersion() < 3 ||
+     context->format().majorVersion() == 3 && context->format().minorVersion() < 3) {
+    delete context;
+    context = nullptr;
+    return false;
+  }
+
+  if(!context->makeCurrent(this->windowHandle())) {
+    delete context;
+    context = nullptr;
+    return false;
+  }
+
+  if(!gladLoadGL(get_proc_address)) {
+    delete context;
+    context = nullptr;
+    return false;
+  }
 
-  gladLoadGL(get_proc_address);
   ogl_video_device.Initialize();
+  UpdateViewport();
 
   context->doneCurrent();
+
+  return true;
 }
 
 void Screen::Draw(u32* buffer) {

src/platform/qt/src/widget/screen.hpp

@@ -19,7 +19,7 @@ struct Screen : QWidget, nba::VideoDevice {
     std::shared_ptr<QtConfig> config
   );
 
-  void Initialize();
+  bool Initialize();
   void Draw(u32* buffer) final;
   void ReloadConfig();
   QPaintEngine* paintEngine() const override { return nullptr; }; // Silence Qt.