Add initial work on Qt frontend

src/duckstation-qt/qthostinterface.h

@@ -0,0 +1,89 @@
+#pragma once
+#include <atomic>
+#include <memory>
+#include <QtCore/QObject>
+#include <QtCore/QThread>
+#include <QtCore/QSettings>
+#include "core/host_interface.h"
+#include "opengldisplaywindow.h"
+
+class QWidget;
+
+class GameList;
+
+class QtHostInterface : public QObject, private HostInterface
+{
+  Q_OBJECT
+
+public:
+  explicit QtHostInterface(QObject* parent = nullptr);
+  ~QtHostInterface();
+
+  void ReportError(const char* message) override;
+  void ReportMessage(const char* message) override;
+
+  const QSettings& getQSettings() const { return m_qsettings; }
+  QSettings& getQSettings() { return m_qsettings; }
+  void setDefaultSettings();
+  void applySettings();
+
+  const GameList* getGameList() const { return m_game_list.get(); }
+  GameList* getGameList() { return m_game_list.get(); }
+  void updateGameListDatabase(bool refresh_list = true);
+  void refreshGameList(bool invalidate_cache = false);
+
+  bool isOnWorkerThread() const { return QThread::currentThread() == m_worker_thread; }
+
+  QWidget* createDisplayWidget(QWidget* parent);
+  void destroyDisplayWidget();
+
+  void bootSystem(QString initial_filename, QString initial_save_state_filename);
+
+Q_SIGNALS:
+  void emulationStarting();
+  void emulationStarted();
+  void emulationStopped();
+  void emulationPaused(bool paused);
+  void gameListRefreshed();
+
+public Q_SLOTS:
+  void powerOffSystem();
+  void resetSystem();
+  void pauseSystem(bool paused);
+  void changeDisc(QString new_disc_filename);
+
+private Q_SLOTS:
+  void doBootSystem(QString initial_filename, QString initial_save_state_filename);
+  void doStopThread();
+
+private:
+  class Thread : public QThread
+  {
+  public:
+    Thread(QtHostInterface* parent);
+    ~Thread();
+
+  protected:
+    void run() override;
+
+  private:
+    QtHostInterface* m_parent;
+  };
+
+  void checkSettings();
+  void createGameList();
+  void createThread();
+  void stopThread();
+  void threadEntryPoint();
+
+  QSettings m_qsettings;
+
+  std::unique_ptr<GameList> m_game_list;
+
+  OpenGLDisplayWindow* m_opengl_display_window = nullptr;
+  QThread* m_original_thread = nullptr;
+  Thread* m_worker_thread = nullptr;
+
+  std::atomic_bool m_shutdown_flag{ false };
+};
+