FrontendCommon: Move input binding and some other logic from Qt to common

src/core/host_interface.cpp

@@ -53,7 +53,6 @@ HostInterface::HostInterface()
 {
   SetUserDirectory();
   CreateUserDirectorySubdirectories();
-  SetDefaultSettings();
   m_game_list = std::make_unique<GameList>();
   m_game_list->SetCacheFilename(GetGameListCacheFileName());
   m_game_list->SetDatabaseFilename(GetGameListDatabaseFileName());
@@ -135,6 +134,17 @@ void HostInterface::ResetSystem()
   AddOSDMessage("System reset.");
 }
 
+void HostInterface::PowerOffSystem()
+{
+  if (!m_system)
+    return;
+
+  if (m_settings.save_state_on_exit)
+    SaveResumeSaveState();
+
+  DestroySystem();
+}
+
 void HostInterface::DestroySystem()
 {
   if (!m_system)
@@ -493,7 +503,11 @@ bool HostInterface::SaveState(bool global, s32 slot)
   }
 
   std::string save_path = global ? GetGlobalSaveStateFileName(slot) : GetGameSaveStateFileName(code.c_str(), slot);
-  return SaveState(save_path.c_str());
+  if (!SaveState(save_path.c_str()))
+    return false;
+
+  OnSystemStateSaved(global, slot);
+  return true;
 }
 
 bool HostInterface::ResumeSystemFromState(const char* filename, bool boot_on_failure)
@@ -584,6 +598,8 @@ void HostInterface::OnSystemDestroyed()
 
 void HostInterface::OnSystemPerformanceCountersUpdated() {}
 
+void HostInterface::OnSystemStateSaved(bool global, s32 slot) {}
+
 void HostInterface::OnRunningGameChanged() {}
 
 void HostInterface::OnControllerTypeChanged(u32 slot) {}
@@ -725,7 +741,7 @@ std::vector<HostInterface::SaveStateInfo> HostInterface::GetAvailableSaveStates(
   std::vector<SaveStateInfo> si;
   std::string path;
 
-  auto add_path = [&si](const std::string& path, s32 slot, bool global) {
+  auto add_path = [&si](std::string path, s32 slot, bool global) {
     FILESYSTEM_STAT_DATA sd;
     if (!FileSystem::StatFile(path.c_str(), &sd))
       return;
@@ -766,42 +782,67 @@ std::string HostInterface::GetMostRecentResumeSaveStatePath() const
   return std::move(most_recent->FileName);
 }
 
-void HostInterface::SetDefaultSettings()
+void HostInterface::CheckSettings(SettingsInterface& si)
 {
-  m_settings.region = ConsoleRegion::Auto;
+  const int settings_version = si.GetIntValue("Main", "SettingsVersion", -1);
-  m_settings.cpu_execution_mode = CPUExecutionMode::Interpreter;
+  if (settings_version == SETTINGS_VERSION)
+    return;
 
-  m_settings.emulation_speed = 1.0f;
+  // TODO: we probably should delete all the sections in the ini...
-  m_settings.speed_limiter_enabled = true;
+  Log_WarningPrintf("Settings version %d does not match expected version %d, resetting", settings_version,
-  m_settings.increase_timer_resolution = true;
+                    SETTINGS_VERSION);
-  m_settings.start_paused = false;
+  si.Clear();
-  m_settings.save_state_on_exit = true;
+  si.SetIntValue("Main", "SettingsVersion", SETTINGS_VERSION);
-  m_settings.confim_power_off = true;
+  SetDefaultSettings(si);
+}
 
-  m_settings.gpu_renderer = Settings::DEFAULT_GPU_RENDERER;
+void HostInterface::SetDefaultSettings(SettingsInterface& si)
-  m_settings.gpu_resolution_scale = 1;
+{
-  m_settings.gpu_true_color = true;
+  si.SetStringValue("Console", "Region", Settings::GetConsoleRegionName(ConsoleRegion::Auto));
-  m_settings.gpu_texture_filtering = false;
-  m_settings.gpu_force_progressive_scan = true;
-  m_settings.gpu_use_debug_device = false;
-  m_settings.display_linear_filtering = true;
-  m_settings.display_fullscreen = false;
-  m_settings.video_sync_enabled = true;
 
-  m_settings.cdrom_read_thread = true;
+  si.SetFloatValue("Main", "EmulationSpeed", 1.0f);
+  si.SetBoolValue("Main", "SpeedLimiterEnabled", true);
+  si.SetBoolValue("Main", "IncreaseTimerResolution", true);
+  si.SetBoolValue("Main", "StartPaused", false);
+  si.SetBoolValue("Main", "SaveStateOnExit", true);
+  si.SetBoolValue("Main", "ConfirmPowerOff", true);
 
-  m_settings.audio_backend = AudioBackend::Cubeb;
+  si.SetStringValue("CPU", "ExecutionMode", Settings::GetCPUExecutionModeName(CPUExecutionMode::Interpreter));
-  m_settings.audio_sync_enabled = true;
 
-  m_settings.bios_path = "bios/scph1001.bin";
+  si.SetStringValue("GPU", "Renderer", Settings::GetRendererName(Settings::DEFAULT_GPU_RENDERER));
-  m_settings.bios_patch_tty_enable = false;
+  si.SetIntValue("GPU", "ResolutionScale", 1);
-  m_settings.bios_patch_fast_boot = false;
+  si.SetBoolValue("GPU", "TrueColor", true);
+  si.SetBoolValue("GPU", "TextureFiltering", false);
+  si.SetBoolValue("GPU", "ForceProgressiveScan", true);
+  si.SetBoolValue("GPU", "UseDebugDevice", false);
 
-  m_settings.controller_types[0] = ControllerType::DigitalController;
+  si.SetBoolValue("Display", "LinearFiltering", true);
-  m_settings.controller_types[1] = ControllerType::None;
+  si.SetBoolValue("Display", "Fullscreen", false);
+  si.SetBoolValue("Display", "VSync", true);
 
-  m_settings.memory_card_paths[0] = "memcards/shared_card_1.mcd";
+  si.SetBoolValue("CDROM", "ReadThread", true);
-  m_settings.memory_card_paths[1].clear();
+
+  si.SetStringValue("Audio", "Backend", Settings::GetAudioBackendName(AudioBackend::Cubeb));
+  si.SetBoolValue("Audio", "Sync", true);
+
+  si.SetStringValue("BIOS", "Path", "bios/scph1001.bin");
+  si.SetBoolValue("BIOS", "PatchTTYEnable", false);
+  si.SetBoolValue("BIOS", "PatchFastBoot", false);
+
+  si.SetStringValue("Controller1", "Type", Settings::GetControllerTypeName(ControllerType::DigitalController));
+  si.SetStringValue("Controller2", "Type", Settings::GetControllerTypeName(ControllerType::None));
+
+  si.SetStringValue("MemoryCards", "Card1Path", "memcards/shared_card_1.mcd");
+  si.SetStringValue("MemoryCards", "Card2Path", "");
+
+  si.SetBoolValue("Debug", "ShowVRAM", false);
+  si.SetBoolValue("Debug", "DumpCPUToVRAMCopies", false);
+  si.SetBoolValue("Debug", "DumpVRAMToCPUCopies", false);
+  si.SetBoolValue("Debug", "ShowGPUState", false);
+  si.SetBoolValue("Debug", "ShowCDROMState", false);
+  si.SetBoolValue("Debug", "ShowSPUState", false);
+  si.SetBoolValue("Debug", "ShowTimersState", false);
+  si.SetBoolValue("Debug", "ShowMDECState", false);
 }
 
 void HostInterface::UpdateSettings(const std::function<void()>& apply_callback)

src/core/host_interface.h

@@ -46,15 +46,17 @@ public:
   bool BootSystemFromBIOS();
   void PauseSystem(bool paused);
   void ResetSystem();
+  void PowerOffSystem();
   void DestroySystem();
 
+  /// Loads state from the specified filename.
+  bool LoadState(const char* filename);
+
   /// Loads the current emulation state from file. Specifying a slot of -1 loads the "resume" game state.
   bool LoadState(bool global, s32 slot);
-  bool LoadState(const char* filename);
 
   /// Saves the current emulation state to a file. Specifying a slot of -1 saves the "resume" save state.
   bool SaveState(bool global, s32 slot);
-  bool SaveState(const char* filename);
 
   /// Loads the resume save state for the given game. Optionally boots the game anyway if loading fails.
   bool ResumeSystemFromState(const char* filename, bool boot_on_failure);
@@ -91,12 +93,13 @@ public:
 protected:
   enum : u32
   {
+    SETTINGS_VERSION = 2,
     AUDIO_SAMPLE_RATE = 44100,
     AUDIO_CHANNELS = 2,
     AUDIO_BUFFER_SIZE = 2048,
     AUDIO_BUFFERS = 2,
     PER_GAME_SAVE_STATE_SLOTS = 10,
-    GLOBAL_SAVE_STATE_SLOTS = 10
+    GLOBAL_SAVE_STATE_SLOTS = 10,
   };
 
   struct OSDMessage
@@ -122,6 +125,7 @@ protected:
   virtual void OnSystemPaused(bool paused);
   virtual void OnSystemDestroyed();
   virtual void OnSystemPerformanceCountersUpdated();
+  virtual void OnSystemStateSaved(bool global, s32 slot);
   virtual void OnRunningGameChanged();
   virtual void OnControllerTypeChanged(u32 slot);
 
@@ -160,8 +164,11 @@ protected:
   /// Loads the BIOS image for the specified region.
   std::optional<std::vector<u8>> GetBIOSImage(ConsoleRegion region);
 
+  /// Ensures the settings is valid and the correct version. If not, resets to defaults.
+  void CheckSettings(SettingsInterface& si);
+
   /// Restores all settings to defaults.
-  void SetDefaultSettings();
+  virtual void SetDefaultSettings(SettingsInterface& si);
 
   /// Applies new settings, updating internal state as needed. apply_callback should call m_settings.Load() after
   /// locking any required mutexes.
@@ -202,4 +209,5 @@ protected:
 
 private:
   void CreateAudioStream();
+  bool SaveState(const char* filename);
 };

src/core/settings.cpp

@@ -9,12 +9,12 @@ void Settings::Load(SettingsInterface& si)
   region =
     ParseConsoleRegionName(si.GetStringValue("Console", "Region", "NTSC-U").c_str()).value_or(ConsoleRegion::NTSC_U);
 
-  emulation_speed = si.GetFloatValue("General", "EmulationSpeed", 1.0f);
+  emulation_speed = si.GetFloatValue("Main", "EmulationSpeed", 1.0f);
-  speed_limiter_enabled = si.GetBoolValue("General", "SpeedLimiterEnabled", true);
+  speed_limiter_enabled = si.GetBoolValue("Main", "SpeedLimiterEnabled", true);
-  increase_timer_resolution = si.GetBoolValue("General", "IncreaseTimerResolution", true);
+  increase_timer_resolution = si.GetBoolValue("Main", "IncreaseTimerResolution", true);
-  start_paused = si.GetBoolValue("General", "StartPaused", false);
+  start_paused = si.GetBoolValue("Mainal", "StartPaused", false);
-  save_state_on_exit = si.GetBoolValue("General", "SaveStateOnExit", true);
+  save_state_on_exit = si.GetBoolValue("Main", "SaveStateOnExit", true);
-  confim_power_off = si.GetBoolValue("General", "ConfirmPowerOff", true);
+  confim_power_off = si.GetBoolValue("Main", "ConfirmPowerOff", true);
 
   cpu_execution_mode = ParseCPUExecutionMode(si.GetStringValue("CPU", "ExecutionMode", "Interpreter").c_str())
                          .value_or(CPUExecutionMode::Interpreter);
@@ -63,12 +63,12 @@ void Settings::Save(SettingsInterface& si) const
 {
   si.SetStringValue("Console", "Region", GetConsoleRegionName(region));
 
-  si.SetFloatValue("General", "EmulationSpeed", emulation_speed);
+  si.SetFloatValue("Main", "EmulationSpeed", emulation_speed);
-  si.SetBoolValue("General", "SpeedLimiterEnabled", speed_limiter_enabled);
+  si.SetBoolValue("Main", "SpeedLimiterEnabled", speed_limiter_enabled);
-  si.SetBoolValue("General", "IncreaseTimerResolution", increase_timer_resolution);
+  si.SetBoolValue("Main", "IncreaseTimerResolution", increase_timer_resolution);
-  si.SetBoolValue("General", "StartPaused", start_paused);
+  si.SetBoolValue("Main", "StartPaused", start_paused);
-  si.SetBoolValue("General", "SaveStateOnExit", save_state_on_exit);
+  si.SetBoolValue("Main", "SaveStateOnExit", save_state_on_exit);
-  si.SetBoolValue("General", "ConfirmPowerOff", confim_power_off);
+  si.SetBoolValue("Main", "ConfirmPowerOff", confim_power_off);
 
   si.SetStringValue("CPU", "ExecutionMode", GetCPUExecutionModeName(cpu_execution_mode));
 

src/core/settings.h

@@ -9,6 +9,8 @@
 class SettingsInterface
 {
 public:
+  virtual void Clear() = 0;
+
   virtual int GetIntValue(const char* section, const char* key, int default_value = 0) = 0;
   virtual float GetFloatValue(const char* section, const char* key, float default_value = 0.0f) = 0;
   virtual bool GetBoolValue(const char* section, const char* key, bool default_value = false) = 0;

src/duckstation-qt/consolesettingswidget.cpp

@@ -20,15 +20,14 @@ ConsoleSettingsWidget::ConsoleSettingsWidget(QtHostInterface* host_interface, QW
   SettingWidgetBinder::BindWidgetToStringSetting(m_host_interface, m_ui.biosPath, "BIOS/Path");
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.enableTTYOutput, "BIOS/PatchTTYEnable");
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.fastBoot, "BIOS/PatchFastBoot");
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.enableSpeedLimiter,
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.enableSpeedLimiter, "Main/SpeedLimiterEnabled");
-                                               "General/SpeedLimiterEnabled");
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.increaseTimerResolution,
-                                               "General/IncreaseTimerResolution");
+                                               "Main/IncreaseTimerResolution");
-  SettingWidgetBinder::BindWidgetToNormalizedSetting(m_host_interface, m_ui.emulationSpeed, "General/EmulationSpeed",
+  SettingWidgetBinder::BindWidgetToNormalizedSetting(m_host_interface, m_ui.emulationSpeed, "Main/EmulationSpeed",
                                                      100.0f);
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.pauseOnStart, "General/StartPaused");
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.pauseOnStart, "Main/StartPaused");
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.saveStateOnExit, "General/SaveStateOnExit");
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.saveStateOnExit, "Main/SaveStateOnExit");
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.confirmPowerOff, "General/ConfirmPowerOff");
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.confirmPowerOff, "Main/ConfirmPowerOff");
   SettingWidgetBinder::BindWidgetToEnumSetting(m_host_interface, m_ui.cpuExecutionMode, "CPU/ExecutionMode",
                                                &Settings::ParseCPUExecutionMode, &Settings::GetCPUExecutionModeName);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.cdromReadThread, "CDROM/ReadThread");

src/duckstation-qt/hotkeysettingswidget.cpp

@@ -34,11 +34,12 @@ void HotkeySettingsWidget::createUi()
 
 void HotkeySettingsWidget::createButtons()
 {
-  std::vector<QtHostInterface::HotkeyInfo> hotkeys = m_host_interface->getHotkeyList();
+  const auto& hotkeys = m_host_interface->getHotkeyInfoList();
-
+  for (const auto& hi : hotkeys)
-  for (const QtHostInterface::HotkeyInfo& hi : hotkeys)
   {
-    auto iter = m_categories.find(hi.category);
+    const auto category = QString::fromUtf8(hi.category);
+
+    auto iter = m_categories.find(category);
     if (iter == m_categories.end())
     {
       QScrollArea* scroll = new QScrollArea(m_tab_widget);
@@ -48,20 +49,20 @@ void HotkeySettingsWidget::createButtons()
       layout->setContentsMargins(0, 0, 0, 0);
       vlayout->addLayout(layout);
       vlayout->addStretch(1);
-      iter = m_categories.insert(hi.category, Category{container, layout});
+      iter = m_categories.insert(category, Category{container, layout});
       scroll->setWidget(container);
       scroll->setWidgetResizable(true);
       scroll->setBackgroundRole(QPalette::Base);
       scroll->setFrameShape(QFrame::NoFrame);
-      m_tab_widget->addTab(scroll, hi.category);
+      m_tab_widget->addTab(scroll, category);
     }
 
     QWidget* container = iter->container;
     QGridLayout* layout = iter->layout;
     const int target_row = layout->count() / 2;
 
-    const QString setting_name = QStringLiteral("Hotkeys/%1").arg(hi.name);
+    const QString setting_name = QStringLiteral("Hotkeys/%1").arg(hi.name.GetCharArray());
-    layout->addWidget(new QLabel(hi.display_name, container), target_row, 0);
+    layout->addWidget(new QLabel(QString::fromUtf8(hi.display_name), container), target_row, 0);
     layout->addWidget(new InputButtonBindingWidget(m_host_interface, setting_name, container), target_row, 1);
   }
 }

src/duckstation-qt/mainwindow.cpp

@@ -45,7 +45,10 @@ void MainWindow::reportMessage(const QString& message)
 
 bool MainWindow::confirmMessage(const QString& message)
 {
-  return (QMessageBox::question(this, tr("DuckStation"), message) == QMessageBox::Yes);
+  const int result = QMessageBox::question(this, tr("DuckStation"), message);
+  focusDisplayWidget();
+  
+  return (result == QMessageBox::Yes);
 }
 
 void MainWindow::createDisplayWindow(QThread* worker_thread, bool use_debug_device)

src/duckstation-qt/qthostinterface.cpp

@@ -27,9 +27,10 @@ Log_SetChannel(QtHostInterface);
 #endif
 
 QtHostInterface::QtHostInterface(QObject* parent)
-  : QObject(parent), HostInterface(), m_qsettings(QString::fromStdString(GetSettingsFileName()), QSettings::IniFormat)
+  : QObject(parent), CommonHostInterface(),
+    m_qsettings(QString::fromStdString(GetSettingsFileName()), QSettings::IniFormat)
 {
-  checkSettings();
+  loadSettings();
   refreshGameList();
   createThread();
 }
@@ -59,34 +60,6 @@ bool QtHostInterface::ConfirmMessage(const char* message)
   return messageConfirmed(QString::fromLocal8Bit(message));
 }
 
-void QtHostInterface::setDefaultSettings()
-{
-  HostInterface::UpdateSettings([this]() { HostInterface::SetDefaultSettings(); });
-
-  // default input settings for Qt
-  std::lock_guard<std::mutex> guard(m_qsettings_mutex);
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonUp"), QStringLiteral("Keyboard/W"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonDown"), QStringLiteral("Keyboard/S"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonLeft"), QStringLiteral("Keyboard/A"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonRight"), QStringLiteral("Keyboard/D"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonSelect"), QStringLiteral("Keyboard/Backspace"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonStart"), QStringLiteral("Keyboard/Return"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonTriangle"), QStringLiteral("Keyboard/8"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonCross"), QStringLiteral("Keyboard/2"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonSquare"), QStringLiteral("Keyboard/4"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonCircle"), QStringLiteral("Keyboard/6"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonL1"), QStringLiteral("Keyboard/Q"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonL2"), QStringLiteral("Keyboard/1"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonR1"), QStringLiteral("Keyboard/E"));
-  m_qsettings.setValue(QStringLiteral("Controller1/ButtonR2"), QStringLiteral("Keyboard/3"));
-  m_qsettings.setValue(QStringLiteral("Hotkeys/FastForward"), QStringLiteral("Keyboard/Tab"));
-  m_qsettings.setValue(QStringLiteral("Hotkeys/PowerOff"), QStringLiteral("Keyboard/Escape"));
-  m_qsettings.setValue(QStringLiteral("Hotkeys/TogglePause"), QStringLiteral("Keyboard/Pause"));
-  m_qsettings.setValue(QStringLiteral("Hotkeys/ToggleFullscreen"), QStringLiteral("Keyboard/Alt+Return"));
-
-  updateQSettingsFromCoreSettings();
-}
-
 QVariant QtHostInterface::getSettingValue(const QString& name, const QVariant& default_value)
 {
   std::lock_guard<std::mutex> guard(m_qsettings_mutex);
@@ -105,10 +78,18 @@ void QtHostInterface::removeSettingValue(const QString& name)
   m_qsettings.remove(name);
 }
 
-void QtHostInterface::updateQSettingsFromCoreSettings()
+void QtHostInterface::setDefaultSettings()
 {
+  if (!isOnWorkerThread())
+  {
+    QMetaObject::invokeMethod(this, "setDefaultSettings", Qt::QueuedConnection);
+    return;
+  }
+
+  std::lock_guard<std::mutex> guard(m_qsettings_mutex);
   QtSettingsInterface si(m_qsettings);
-  m_settings.Save(si);
+  UpdateSettings([this, &si]() { m_settings.Load(si); });
+  UpdateInputMap(si);
 }
 
 void QtHostInterface::applySettings()
@@ -119,38 +100,28 @@ void QtHostInterface::applySettings()
     return;
   }
 
-  UpdateSettings([this]() {
   std::lock_guard<std::mutex> guard(m_qsettings_mutex);
   QtSettingsInterface si(m_qsettings);
-    m_settings.Load(si);
+  UpdateSettings([this, &si]() { m_settings.Load(si); });
-  });
+  UpdateInputMap(si);
 }
 
-void QtHostInterface::checkSettings()
+void QtHostInterface::loadSettings()
 {
+  // no need to lock here because the emu thread doesn't exist yet
+  QtSettingsInterface si(m_qsettings);
+
   const QSettings::Status settings_status = m_qsettings.status();
   if (settings_status != QSettings::NoError)
-    m_qsettings.clear();
-
-  const QString settings_version_key = QStringLiteral("General/SettingsVersion");
-  const int expected_version = 1;
-  const QVariant settings_version_var = m_qsettings.value(settings_version_key);
-  bool settings_version_okay;
-  int settings_version = settings_version_var.toInt(&settings_version_okay);
-  if (!settings_version_okay)
-    settings_version = 0;
-  if (settings_version != expected_version)
   {
-    Log_WarningPrintf("Settings version %d does not match expected version %d, resetting", settings_version,
-                      expected_version);
     m_qsettings.clear();
-    m_qsettings.setValue(settings_version_key, expected_version);
+    SetDefaultSettings(si);
-    setDefaultSettings();
   }
 
-  // initial setting init - we don't do this locked since the thread hasn't been created yet
+  CheckSettings(si);
-  QtSettingsInterface si(m_qsettings);
   m_settings.Load(si);
+
+  // input map update is done on the emu thread
 }
 
 void QtHostInterface::refreshGameList(bool invalidate_cache /* = false */, bool invalidate_database /* = false */)
@@ -219,20 +190,11 @@ void QtHostInterface::handleKeyEvent(int key, bool pressed)
 {
   if (!isOnWorkerThread())
   {
-    QMetaObject::invokeMethod(this, "doHandleKeyEvent", Qt::QueuedConnection, Q_ARG(int, key), Q_ARG(bool, pressed));
+    QMetaObject::invokeMethod(this, "handleKeyEvent", Qt::QueuedConnection, Q_ARG(int, key), Q_ARG(bool, pressed));
     return;
   }
 
-  doHandleKeyEvent(key, pressed);
+  HandleHostKeyEvent(key, pressed);
-}
-
-void QtHostInterface::doHandleKeyEvent(int key, bool pressed)
-{
-  const auto iter = m_keyboard_input_handlers.find(key);
-  if (iter == m_keyboard_input_handlers.end())
-    return;
-
-  iter->second(pressed);
 }
 
 void QtHostInterface::onDisplayWindowResized(int width, int height)
@@ -275,22 +237,24 @@ void QtHostInterface::ReleaseHostDisplay()
   emit destroyDisplayWindowRequested();
 }
 
-std::unique_ptr<AudioStream> QtHostInterface::CreateAudioStream(AudioBackend backend)
+void QtHostInterface::SetFullscreen(bool enabled)
 {
-  switch (backend)
+  emit setFullscreenRequested(enabled);
-  {
+}
-    case AudioBackend::Null:
-      return AudioStream::CreateNullAudioStream();
 
-    case AudioBackend::Cubeb:
+void QtHostInterface::ToggleFullscreen()
-      return AudioStream::CreateCubebAudioStream();
+{
+  emit toggleFullscreenRequested();
+}
 
-    case AudioBackend::SDL:
+std::optional<CommonHostInterface::HostKeyCode> QtHostInterface::GetHostKeyCode(const std::string_view key_code) const
-      return SDLAudioStream::Create();
+{
+  const std::optional<int> code =
+    QtUtils::ParseKeyString(QString::fromUtf8(key_code.data(), static_cast<int>(key_code.length())));
+  if (!code)
+    return std::nullopt;
 
-    default:
+  return static_cast<s32>(*code);
-      return nullptr;
-  }
 }
 
 void QtHostInterface::OnSystemCreated()
@@ -351,6 +315,11 @@ void QtHostInterface::OnRunningGameChanged()
   }
 }
 
+void QtHostInterface::OnSystemStateSaved(bool global, s32 slot)
+{
+  emit stateSaved(QString::fromStdString(m_system->GetRunningCode()), global, slot);
+}
+
 void QtHostInterface::OnControllerTypeChanged(u32 slot)
 {
   HostInterface::OnControllerTypeChanged(slot);
@@ -362,282 +331,13 @@ void QtHostInterface::updateInputMap()
 {
   if (!isOnWorkerThread())
   {
-    QMetaObject::invokeMethod(this, "doUpdateInputMap", Qt::QueuedConnection);
+    QMetaObject::invokeMethod(this, "updateInputMap", Qt::QueuedConnection);
     return;
   }
 
-  doUpdateInputMap();
-}
-
-void QtHostInterface::doUpdateInputMap()
-{
-  m_keyboard_input_handlers.clear();
-  g_sdl_controller_interface.ClearControllerBindings();
-
   std::lock_guard<std::mutex> lock(m_qsettings_mutex);
-  updateControllerInputMap();
+  QtSettingsInterface si(m_qsettings);
-  updateHotkeyInputMap();
+  UpdateInputMap(si);
-}
-
-void QtHostInterface::updateControllerInputMap()
-{
-  for (u32 controller_index = 0; controller_index < 2; controller_index++)
-  {
-    const ControllerType ctype = m_settings.controller_types[controller_index];
-    if (ctype == ControllerType::None)
-      continue;
-
-    const auto button_names = Controller::GetButtonNames(ctype);
-    for (const auto& it : button_names)
-    {
-      const std::string& button_name = it.first;
-      const s32 button_code = it.second;
-
-      QVariant var = m_qsettings.value(
-        QStringLiteral("Controller%1/Button%2").arg(controller_index + 1).arg(QString::fromStdString(button_name)));
-      if (!var.isValid())
-        continue;
-
-      addButtonToInputMap(var.toString(), [this, controller_index, button_code](bool pressed) {
-        if (!m_system)
-          return;
-
-        Controller* controller = m_system->GetController(controller_index);
-        if (controller)
-          controller->SetButtonState(button_code, pressed);
-      });
-    }
-
-    const auto axis_names = Controller::GetAxisNames(ctype);
-    for (const auto& it : axis_names)
-    {
-      const std::string& axis_name = it.first;
-      const s32 axis_code = it.second;
-
-      QVariant var = m_qsettings.value(
-        QStringLiteral("Controller%1/Axis%2").arg(controller_index + 1).arg(QString::fromStdString(axis_name)));
-      if (!var.isValid())
-        continue;
-
-      addAxisToInputMap(var.toString(), [this, controller_index, axis_code](float value) {
-        if (!m_system)
-          return;
-
-        Controller* controller = m_system->GetController(controller_index);
-        if (controller)
-          controller->SetAxisState(axis_code, value);
-      });
-    }
-  }
-}
-
-std::vector<QtHostInterface::HotkeyInfo> QtHostInterface::getHotkeyList() const
-{
-  std::vector<HotkeyInfo> hotkeys = {
-    {QStringLiteral("FastForward"), QStringLiteral("Toggle Fast Forward"), QStringLiteral("General")},
-    {QStringLiteral("ToggleFullscreen"), QStringLiteral("Toggle Fullscreen"), QStringLiteral("General")},
-    {QStringLiteral("TogglePause"), QStringLiteral("Toggle Pause"), QStringLiteral("General")},
-    {QStringLiteral("PowerOff"), QStringLiteral("Power Off System"), QStringLiteral("General")},
-    {QStringLiteral("ToggleSoftwareRendering"), QStringLiteral("Toggle Software Rendering"),
-     QStringLiteral("Graphics")},
-    {QStringLiteral("IncreaseResolutionScale"), QStringLiteral("Increase Resolution Scale"),
-     QStringLiteral("Graphics")},
-    {QStringLiteral("DecreaseResolutionScale"), QStringLiteral("Decrease Resolution Scale"),
-     QStringLiteral("Graphics")}};
-
-  for (u32 global_i = 0; global_i < 2; global_i++)
-  {
-    const bool global = ConvertToBoolUnchecked(global_i);
-    const u32 count = global ? GLOBAL_SAVE_STATE_SLOTS : PER_GAME_SAVE_STATE_SLOTS;
-    for (u32 i = 1; i <= count; i++)
-    {
-      hotkeys.push_back({QStringLiteral("Load%1State%2").arg(global ? "Global" : "Game").arg(i),
-                         QStringLiteral("Load %1 State %2").arg(global ? tr("Global") : tr("Game")).arg(i),
-                         QStringLiteral("Save States")});
-    }
-    for (u32 slot = 1; slot <= count; slot++)
-    {
-      hotkeys.push_back({QStringLiteral("Save%1State%2").arg(global ? "Global" : "Game").arg(slot),
-                         QStringLiteral("Save %1 State %2").arg(global ? tr("Global") : tr("Game")).arg(slot),
-                         QStringLiteral("Save States")});
-    }
-  }
-
-  return hotkeys;
-}
-
-void QtHostInterface::updateHotkeyInputMap()
-{
-  auto hk = [this](const QString& hotkey_name, InputButtonHandler handler) {
-    QVariant var = m_qsettings.value(QStringLiteral("Hotkeys/%1").arg(hotkey_name));
-    if (!var.isValid())
-      return;
-
-    addButtonToInputMap(var.toString(), std::move(handler));
-  };
-
-  hk(QStringLiteral("FastForward"), [this](bool pressed) {
-    m_speed_limiter_temp_disabled = pressed;
-    HostInterface::UpdateSpeedLimiterState();
-  });
-
-  hk(QStringLiteral("ToggleFullscreen"), [this](bool pressed) {
-    if (!pressed)
-      emit toggleFullscreenRequested();
-  });
-
-  hk(QStringLiteral("TogglePause"), [this](bool pressed) {
-    if (!pressed)
-      pauseSystem(!m_paused);
-  });
-
-  hk(QStringLiteral("PowerOff"), [this](bool pressed) {
-    if (!pressed && m_system)
-    {
-      if (m_settings.confim_power_off)
-      {
-        emit setFullscreenRequested(false);
-
-        QString confirmation_message = tr("Are you sure you want to stop emulation?");
-        if (m_settings.save_state_on_exit)
-        {
-          confirmation_message += "\n\n";
-          confirmation_message += tr("The current state will be saved.");
-        }
-
-        if (!messageConfirmed(confirmation_message))
-        {
-          if (m_settings.display_fullscreen)
-            emit setFullscreenRequested(true);
-          else
-            emit focusDisplayWidgetRequested();
-
-          m_system->ResetPerformanceCounters();
-          return;
-        }
-      }
-
-      powerOffSystem();
-    }
-  });
-
-  hk(QStringLiteral("ToggleSoftwareRendering"), [this](bool pressed) {
-    if (!pressed)
-      ToggleSoftwareRendering();
-  });
-
-  hk(QStringLiteral("IncreaseResolutionScale"), [this](bool pressed) {
-    if (!pressed)
-      ModifyResolutionScale(1);
-  });
-
-  hk(QStringLiteral("DecreaseResolutionScale"), [this](bool pressed) {
-    if (!pressed)
-      ModifyResolutionScale(-1);
-  });
-
-  for (u32 global_i = 0; global_i < 2; global_i++)
-  {
-    const bool global = ConvertToBoolUnchecked(global_i);
-    const u32 count = global ? GLOBAL_SAVE_STATE_SLOTS : PER_GAME_SAVE_STATE_SLOTS;
-    for (u32 slot = 1; slot <= count; slot++)
-    {
-      hk(QStringLiteral("Load%1State%2").arg(global ? "Global" : "Game").arg(slot), [this, global, slot](bool pressed) {
-        if (!pressed)
-          loadState(global, slot);
-      });
-      hk(QStringLiteral("Save%1State%2").arg(global ? "Global" : "Game").arg(slot), [this, global, slot](bool pressed) {
-        if (!pressed)
-          saveState(global, slot);
-      });
-    }
-  }
-}
-
-void QtHostInterface::addButtonToInputMap(const QString& binding, InputButtonHandler handler)
-{
-  const QString device = binding.section('/', 0, 0);
-  const QString button = binding.section('/', 1, 1);
-  if (device == QStringLiteral("Keyboard"))
-  {
-    std::optional<int> key_id = QtUtils::ParseKeyString(button);
-    if (!key_id.has_value())
-    {
-      qWarning() << "Unknown keyboard key " << button;
-      return;
-    }
-
-    m_keyboard_input_handlers.emplace(key_id.value(), std::move(handler));
-  }
-  else if (device.startsWith(QStringLiteral("Controller")))
-  {
-    bool controller_index_okay;
-    const int controller_index = device.mid(10).toInt(&controller_index_okay);
-    if (!controller_index_okay || controller_index < 0)
-    {
-      qWarning() << "Malformed controller binding: " << binding;
-      return;
-    }
-
-    if (button.startsWith(QStringLiteral("Button")))
-    {
-      bool button_index_okay;
-      const int button_index = button.mid(6).toInt(&button_index_okay);
-      if (!button_index_okay ||
-          !g_sdl_controller_interface.BindControllerButton(controller_index, button_index, std::move(handler)))
-      {
-        qWarning() << "Failed to bind " << binding;
-      }
-    }
-    else if (button.startsWith(QStringLiteral("+Axis")) || button.startsWith(QStringLiteral("-Axis")))
-    {
-      bool axis_index_okay;
-      const int axis_index = button.mid(5).toInt(&axis_index_okay);
-      const bool positive = (button[0] == '+');
-      if (!axis_index_okay || !g_sdl_controller_interface.BindControllerAxisToButton(controller_index, axis_index,
-                                                                                     positive, std::move(handler)))
-      {
-        qWarning() << "Failed to bind " << binding;
-      }
-    }
-  }
-  else
-  {
-    qWarning() << "Unknown input device: " << binding;
-    return;
-  }
-}
-
-void QtHostInterface::addAxisToInputMap(const QString& binding, InputAxisHandler handler)
-{
-  const QString device = binding.section('/', 0, 0);
-  const QString axis = binding.section('/', 1, 1);
-  if (device.startsWith(QStringLiteral("Controller")))
-  {
-    bool controller_index_okay;
-    const int controller_index = device.mid(10).toInt(&controller_index_okay);
-    if (!controller_index_okay || controller_index < 0)
-    {
-      qWarning() << "Malformed controller binding: " << binding;
-      return;
-    }
-
-    if (axis.startsWith(QStringLiteral("Axis")))
-    {
-      bool axis_index_okay;
-      const int axis_index = axis.mid(4).toInt(&axis_index_okay);
-      if (!axis_index_okay ||
-          !g_sdl_controller_interface.BindControllerAxis(controller_index, axis_index, std::move(handler)))
-      {
-        qWarning() << "Failed to bind " << binding;
-      }
-    }
-  }
-  else
-  {
-    qWarning() << "Unknown input device: " << binding;
-    return;
-  }
 }
 
 void QtHostInterface::powerOffSystem()
@@ -799,10 +499,7 @@ void QtHostInterface::saveState(bool global, qint32 slot, bool block_until_done
   }
 
   if (m_system)
-  {
     SaveState(global, slot);
-    emit stateSaved(QString::fromStdString(m_system->GetRunningCode()), global, slot);
-  }
 }
 
 void QtHostInterface::enableBackgroundControllerPolling()
@@ -891,8 +588,7 @@ void QtHostInterface::threadEntryPoint()
   // set up controller interface and immediate poll to pick up the controller attached events
   g_sdl_controller_interface.Initialize(this);
   g_sdl_controller_interface.PumpSDLEvents();
-
+  updateInputMap();
-  doUpdateInputMap();
 
   // TODO: Event which flags the thread as ready
   while (!m_shutdown_flag.load())

src/duckstation-qt/qthostinterface.h

@@ -1,5 +1,6 @@
 #pragma once
 #include "core/host_interface.h"
+#include "frontend-common/common_host_interface.h"
 #include "opengldisplaywindow.h"
 #include <QtCore/QByteArray>
 #include <QtCore/QObject>
@@ -22,7 +23,7 @@ class QTimer;
 
 class GameList;
 
-class QtHostInterface : public QObject, private HostInterface
+class QtHostInterface : public QObject, private CommonHostInterface
 {
   Q_OBJECT
 
@@ -34,8 +35,6 @@ public:
   void ReportMessage(const char* message) override;
   bool ConfirmMessage(const char* message) override;
 
-  void setDefaultSettings();
-
   /// Thread-safe QSettings access.
   QVariant getSettingValue(const QString& name, const QVariant& default_value = QVariant());
   void putSettingValue(const QString& name, const QVariant& value);
@@ -45,21 +44,12 @@ public:
   GameList* getGameList() { return m_game_list.get(); }
   void refreshGameList(bool invalidate_cache = false, bool invalidate_database = false);
 
+  const HotkeyInfoList& getHotkeyInfoList() const { return GetHotkeyInfoList(); }
+
   bool isOnWorkerThread() const { return QThread::currentThread() == m_worker_thread; }
 
   QtDisplayWindow* createDisplayWindow();
 
-  void updateInputMap();
-  void handleKeyEvent(int key, bool pressed);
-
-  struct HotkeyInfo
-  {
-    QString name;
-    QString display_name;
-    QString category;
-  };
-  std::vector<HotkeyInfo> getHotkeyList() const;
-
   void populateSaveStateMenus(const char* game_code, QMenu* load_menu, QMenu* save_menu);
 
 Q_SIGNALS:
@@ -81,7 +71,10 @@ Q_SIGNALS:
   void runningGameChanged(const QString& filename, const QString& game_code, const QString& game_title);
 
 public Q_SLOTS:
+  void setDefaultSettings();
   void applySettings();
+  void updateInputMap();
+  void handleKeyEvent(int key, bool pressed);
   void bootSystemFromFile(const QString& filename);
   void resumeSystemFromState(const QString& filename, bool boot_on_failure);
   void bootSystemFromBIOS();
@@ -103,21 +96,23 @@ public Q_SLOTS:
 
 private Q_SLOTS:
   void doStopThread();
-  void doUpdateInputMap();
-  void doHandleKeyEvent(int key, bool pressed);
   void onDisplayWindowResized(int width, int height);
   void doBackgroundControllerPoll();
 
 protected:
   bool AcquireHostDisplay() override;
   void ReleaseHostDisplay() override;
-  std::unique_ptr<AudioStream> CreateAudioStream(AudioBackend backend) override;
+  void SetFullscreen(bool enabled) override;
+  void ToggleFullscreen() override;
+
+  std::optional<HostKeyCode> GetHostKeyCode(const std::string_view key_code) const override;
 
   void OnSystemCreated() override;
   void OnSystemPaused(bool paused) override;
   void OnSystemDestroyed() override;
   void OnSystemPerformanceCountersUpdated() override;
   void OnRunningGameChanged() override;
+  void OnSystemStateSaved(bool global, s32 slot) override;
   void OnControllerTypeChanged(u32 slot) override;
 
 private:
@@ -143,15 +138,10 @@ private:
     QtHostInterface* m_parent;
   };
 
-  void checkSettings();
+  void loadSettings();
-  void updateQSettingsFromCoreSettings();
   void createBackgroundControllerPollTimer();
   void destroyBackgroundControllerPollTimer();
 
-  void updateControllerInputMap();
-  void updateHotkeyInputMap();
-  void addButtonToInputMap(const QString& binding, InputButtonHandler handler);
-  void addAxisToInputMap(const QString& binding, InputAxisHandler handler);
   void createThread();
   void stopThread();
   void threadEntryPoint();

src/duckstation-qt/qtsettingsinterface.cpp

@@ -11,6 +11,11 @@ QtSettingsInterface::QtSettingsInterface(QSettings& settings) : m_settings(setti
 
 QtSettingsInterface::~QtSettingsInterface() = default;
 
+void QtSettingsInterface::Clear()
+{
+  m_settings.clear();
+}
+
 int QtSettingsInterface::GetIntValue(const char* section, const char* key, int default_value /*= 0*/)
 {
   QVariant value = m_settings.value(GetFullKey(section, key));

src/duckstation-qt/qtsettingsinterface.h

@@ -9,6 +9,8 @@ public:
   QtSettingsInterface(QSettings& settings);
   ~QtSettingsInterface();
 
+  void Clear() override;
+
   int GetIntValue(const char* section, const char* key, int default_value = 0) override;
   float GetFloatValue(const char* section, const char* key, float default_value = 0.0f) override;
   bool GetBoolValue(const char* section, const char* key, bool default_value = false) override;

src/duckstation-sdl/sdl_settings_interface.cpp

@@ -20,6 +20,11 @@ SDLSettingsInterface::~SDLSettingsInterface()
   }
 }
 
+void SDLSettingsInterface::Clear()
+{
+  m_ini.Reset();
+}
+
 int SDLSettingsInterface::GetIntValue(const char* section, const char* key, int default_value /*= 0*/)
 {
   return static_cast<int>(m_ini.GetLongValue(section, key, default_value));

src/duckstation-sdl/sdl_settings_interface.h

@@ -9,6 +9,8 @@ public:
   SDLSettingsInterface(const char* filename);
   ~SDLSettingsInterface();
 
+  void Clear() override;
+
   int GetIntValue(const char* section, const char* key, int default_value = 0) override;
   float GetFloatValue(const char* section, const char* key, float default_value = 0.0f) override;
   bool GetBoolValue(const char* section, const char* key, bool default_value = false) override;

src/frontend-common/CMakeLists.txt

@@ -1,4 +1,6 @@
 add_library(frontend-common
+  common_host_interface.cpp
+  common_host_interface.h
   icon.cpp
   icon.h
   imgui_styles.cpp

src/frontend-common/common_host_interface.cpp

@@ -0,0 +1,374 @@
+#include "common_host_interface.h"
+#include "common/assert.h"
+#include "common/audio_stream.h"
+#include "common/log.h"
+#include "common/string_util.h"
+#include "core/controller.h"
+#include "core/game_list.h"
+#include "core/gpu.h"
+#include "core/system.h"
+#include "sdl_audio_stream.h"
+#include "sdl_controller_interface.h"
+#include <cstring>
+Log_SetChannel(CommonHostInterface);
+
+CommonHostInterface::CommonHostInterface() : HostInterface()
+{
+  RegisterGeneralHotkeys();
+  RegisterGraphicsHotkeys();
+  RegisterSaveStateHotkeys();
+}
+
+CommonHostInterface::~CommonHostInterface() = default;
+
+void CommonHostInterface::SetFullscreen(bool enabled) {}
+
+void CommonHostInterface::ToggleFullscreen() {}
+
+std::unique_ptr<AudioStream> CommonHostInterface::CreateAudioStream(AudioBackend backend)
+{
+  switch (backend)
+  {
+    case AudioBackend::Null:
+      return AudioStream::CreateNullAudioStream();
+
+    case AudioBackend::Cubeb:
+      return AudioStream::CreateCubebAudioStream();
+
+    case AudioBackend::SDL:
+      return SDLAudioStream::Create();
+
+    default:
+      return nullptr;
+  }
+}
+
+void CommonHostInterface::SetDefaultSettings(SettingsInterface& si)
+{
+  HostInterface::SetDefaultSettings(si);
+
+  si.SetStringValue("Controller1", "ButtonUp", "Keyboard/W");
+  si.SetStringValue("Controller1", "ButtonDown", "Keyboard/S");
+  si.SetStringValue("Controller1", "ButtonLeft", "Keyboard/A");
+  si.SetStringValue("Controller1", "ButtonRight", "Keyboard/D");
+  si.SetStringValue("Controller1", "ButtonSelect", "Keyboard/Backspace");
+  si.SetStringValue("Controller1", "ButtonStart", "Keyboard/Return");
+  si.SetStringValue("Controller1", "ButtonTriangle", "Keyboard/8");
+  si.SetStringValue("Controller1", "ButtonCross", "Keyboard/2");
+  si.SetStringValue("Controller1", "ButtonSquare", "Keyboard/4");
+  si.SetStringValue("Controller1", "ButtonCircle", "Keyboard/6");
+  si.SetStringValue("Controller1", "ButtonL1", "Keyboard/Q");
+  si.SetStringValue("Controller1", "ButtonL2", "Keyboard/1");
+  si.SetStringValue("Controller1", "ButtonR1", "Keyboard/E");
+  si.SetStringValue("Controller1", "ButtonR2", "Keyboard/3");
+  si.SetStringValue("Hotkeys", "FastForward", "Keyboard/Tab");
+  si.SetStringValue("Hotkeys", "PowerOff", "Keyboard/Escape");
+  si.SetStringValue("Hotkeys", "TogglePause", "Keyboard/Pause");
+  si.SetStringValue("Hotkeys", "ToggleFullscreen", "Keyboard/Alt+Return");
+}
+
+#if 0
+void CommonHostInterface::refreshGameList(bool invalidate_cache /* = false */, bool invalidate_database /* = false */)
+{
+  std::lock_guard<std::mutex> lock(m_qsettings_mutex);
+  QtSettingsInterface si(m_qsettings);
+  m_game_list->SetSearchDirectoriesFromSettings(si);
+  m_game_list->Refresh(invalidate_cache, invalidate_database);
+  emit gameListRefreshed();
+}
+#endif
+
+std::optional<CommonHostInterface::HostKeyCode>
+CommonHostInterface::GetHostKeyCode(const std::string_view key_code) const
+{
+  return std::nullopt;
+}
+
+void CommonHostInterface::RegisterHotkey(String category, String name, String display_name, InputButtonHandler handler)
+{
+  m_hotkeys.push_back(HotkeyInfo{std::move(category), std::move(name), std::move(display_name), std::move(handler)});
+}
+
+bool CommonHostInterface::HandleHostKeyEvent(HostKeyCode key, bool pressed)
+{
+  const auto iter = m_keyboard_input_handlers.find(key);
+  if (iter == m_keyboard_input_handlers.end())
+    return false;
+
+  iter->second(pressed);
+  return true;
+}
+
+void CommonHostInterface::UpdateInputMap(SettingsInterface& si)
+{
+  m_keyboard_input_handlers.clear();
+  g_sdl_controller_interface.ClearControllerBindings();
+
+  UpdateControllerInputMap(si);
+  UpdateHotkeyInputMap(si);
+}
+
+void CommonHostInterface::UpdateControllerInputMap(SettingsInterface& si)
+{
+  for (u32 controller_index = 0; controller_index < 2; controller_index++)
+  {
+    const ControllerType ctype = m_settings.controller_types[controller_index];
+    if (ctype == ControllerType::None)
+      continue;
+
+    const auto category = TinyString::FromFormat("Controller%u", controller_index + 1);
+    const auto button_names = Controller::GetButtonNames(ctype);
+    for (const auto& it : button_names)
+    {
+      const std::string& button_name = it.first;
+      const s32 button_code = it.second;
+
+      const std::vector<std::string> bindings =
+        si.GetStringList(category, TinyString::FromFormat("Button%s", button_name.c_str()));
+      for (const std::string& binding : bindings)
+      {
+        AddButtonToInputMap(binding, [this, controller_index, button_code](bool pressed) {
+          if (!m_system)
+            return;
+
+          Controller* controller = m_system->GetController(controller_index);
+          if (controller)
+            controller->SetButtonState(button_code, pressed);
+        });
+      }
+    }
+
+    const auto axis_names = Controller::GetAxisNames(ctype);
+    for (const auto& it : axis_names)
+    {
+      const std::string& axis_name = it.first;
+      const s32 axis_code = it.second;
+
+      const std::vector<std::string> bindings =
+        si.GetStringList(category, TinyString::FromFormat("Axis%s", axis_name.c_str()));
+      for (const std::string& binding : bindings)
+      {
+        AddAxisToInputMap(binding, [this, controller_index, axis_code](float value) {
+          if (!m_system)
+            return;
+
+          Controller* controller = m_system->GetController(controller_index);
+          if (controller)
+            controller->SetAxisState(axis_code, value);
+        });
+      }
+    }
+  }
+}
+
+void CommonHostInterface::UpdateHotkeyInputMap(SettingsInterface& si)
+{
+  for (const HotkeyInfo& hi : m_hotkeys)
+  {
+    const std::vector<std::string> bindings = si.GetStringList("Hotkeys", hi.name);
+    for (const std::string& binding : bindings)
+      AddButtonToInputMap(binding, hi.handler);
+  }
+}
+
+void CommonHostInterface::AddButtonToInputMap(const std::string& binding, InputButtonHandler handler)
+{
+  const std::string::size_type slash_pos = binding.find('/');
+  if (slash_pos == std::string::npos)
+  {
+    Log_WarningPrintf("Malformed button binding: '%s'", binding.c_str());
+    return;
+  }
+
+  const auto device = std::string_view(binding).substr(0, slash_pos);
+  const auto button = std::string_view(binding).substr(slash_pos + 1);
+  if (device == "Keyboard")
+  {
+    std::optional<int> key_id = GetHostKeyCode(button);
+    if (!key_id.has_value())
+    {
+      Log_WarningPrintf("Unknown keyboard key in binding '%s'", binding.c_str());
+      return;
+    }
+
+    m_keyboard_input_handlers.emplace(key_id.value(), std::move(handler));
+  }
+  else if (device == "Controller")
+  {
+    const std::optional<int> controller_index = StringUtil::FromChars<int>(device.substr(10));
+    if (!controller_index || *controller_index < 0)
+    {
+      Log_WarningPrintf("Invalid controller index in button binding '%s'", binding.c_str());
+      return;
+    }
+
+    if (button.find_first_of("Button") == 0)
+    {
+      const std::optional<int> button_index = StringUtil::FromChars<int>(button.substr(6));
+      if (!button_index ||
+          !g_sdl_controller_interface.BindControllerButton(*controller_index, *button_index, std::move(handler)))
+      {
+        Log_WarningPrintf("Failed to bind controller button '%s' to button", binding.c_str());
+        return;
+      }
+    }
+    else if (button.find_first_of("+Axis") == 0 || button.find_first_of("-Axis"))
+    {
+      const std::optional<int> axis_index = StringUtil::FromChars<int>(button.substr(5));
+      const bool positive = (button[0] == '+');
+      if (!axis_index || !g_sdl_controller_interface.BindControllerAxisToButton(*controller_index, *axis_index,
+                                                                                positive, std::move(handler)))
+      {
+        Log_WarningPrintf("Failed to bind controller axis '%s' to button", binding.c_str());
+        return;
+      }
+    }
+    else
+    {
+      Log_WarningPrintf("Malformed controller binding '%s' in button", binding.c_str());
+      return;
+    }
+  }
+  else
+  {
+    Log_WarningPrintf("Unknown input device in button binding '%s'", binding.c_str());
+    return;
+  }
+}
+
+void CommonHostInterface::AddAxisToInputMap(const std::string& binding, InputAxisHandler handler)
+{
+  const std::string::size_type slash_pos = binding.find('/');
+  if (slash_pos == std::string::npos)
+  {
+    Log_WarningPrintf("Malformed axis binding: '%s'", binding.c_str());
+    return;
+  }
+
+  const auto device = std::string_view(binding).substr(0, slash_pos);
+  const auto axis = std::string_view(binding).substr(slash_pos + 1);
+  if (device == "Controller")
+  {
+    const std::optional<int> controller_index = StringUtil::FromChars<int>(device.substr(10));
+    if (!controller_index || *controller_index < 0)
+    {
+      Log_WarningPrintf("Invalid controller index in axis binding '%s'", binding.c_str());
+      return;
+    }
+
+    if (axis.find_first_of("Axis") == 0)
+    {
+      const std::optional<int> axis_index = StringUtil::FromChars<int>(axis.substr(4));
+      if (!axis_index ||
+          !g_sdl_controller_interface.BindControllerAxis(*controller_index, *axis_index, std::move(handler)))
+      {
+        Log_WarningPrintf("Failed to bind controller axis '%s' to axi", binding.c_str());
+        return;
+      }
+    }
+    else
+    {
+      Log_WarningPrintf("Malformed controller binding '%s' in button", binding.c_str());
+      return;
+    }
+  }
+  else
+  {
+    Log_WarningPrintf("Unknown input device in axis binding '%s'", binding.c_str());
+    return;
+  }
+}
+
+void CommonHostInterface::RegisterGeneralHotkeys()
+{
+  RegisterHotkey(StaticString("General"), StaticString("FastForward"), StaticString("Toggle Fast Forward"),
+                 [this](bool pressed) {
+                   m_speed_limiter_temp_disabled = pressed;
+                   HostInterface::UpdateSpeedLimiterState();
+                 });
+
+  RegisterHotkey(StaticString("General"), StaticString("ToggleFullscreen"), StaticString("Toggle Fullscreen"),
+                 [this](bool pressed) {
+                   if (!pressed)
+                     ToggleFullscreen();
+                 });
+
+  RegisterHotkey(StaticString("General"), StaticString("TogglePause"), StaticString("Toggle Pause"),
+                 [this](bool pressed) {
+                   if (!pressed)
+                     PauseSystem(!m_paused);
+                 });
+
+  RegisterHotkey(StaticString("General"), StaticString("PowerOff"), StaticString("Power Off System"),
+                 [this](bool pressed) {
+                   if (!pressed && m_system)
+                   {
+                     if (m_settings.confim_power_off)
+                     {
+                       SetFullscreen(false);
+
+                       SmallString confirmation_message("Are you sure you want to stop emulation?");
+                       if (m_settings.save_state_on_exit)
+                         confirmation_message.AppendString("\n\nThe current state will be saved.");
+
+                       if (!ConfirmMessage(confirmation_message))
+                       {
+                         if (m_settings.display_fullscreen)
+                           SetFullscreen(true);
+
+                         m_system->ResetPerformanceCounters();
+                         return;
+                       }
+                     }
+
+                     PowerOffSystem();
+                   }
+                 });
+}
+
+void CommonHostInterface::RegisterGraphicsHotkeys()
+{
+  RegisterHotkey(StaticString("Graphics"), StaticString("ToggleSoftwareRendering"),
+                 StaticString("Toggle Software Rendering"), [this](bool pressed) {
+                   if (!pressed)
+                     ToggleSoftwareRendering();
+                 });
+
+  RegisterHotkey(StaticString("Graphics"), StaticString("IncreaseResolutionScale"),
+                 StaticString("Increase Resolution Scale"), [this](bool pressed) {
+                   if (!pressed)
+                     ModifyResolutionScale(1);
+                 });
+
+  RegisterHotkey(StaticString("Graphics"), StaticString("DecreaseResolutionScale"),
+                 StaticString("Decrease Resolution Scale"), [this](bool pressed) {
+                   if (!pressed)
+                     ModifyResolutionScale(-1);
+                 });
+}
+
+void CommonHostInterface::RegisterSaveStateHotkeys()
+{
+  for (u32 global_i = 0; global_i < 2; global_i++)
+  {
+    const bool global = ConvertToBoolUnchecked(global_i);
+    const u32 count = global ? GLOBAL_SAVE_STATE_SLOTS : PER_GAME_SAVE_STATE_SLOTS;
+    for (u32 slot = 1; slot <= count; slot++)
+    {
+      RegisterHotkey(StaticString("Save States"),
+                     TinyString::FromFormat("Load%sState%u", global ? "Global" : "Game", slot),
+                     TinyString::FromFormat("Load %s State %u", global ? "Global" : "Game", slot),
+                     [this, global, slot](bool pressed) {
+                       if (!pressed)
+                         LoadState(global, slot);
+                     });
+      RegisterHotkey(StaticString("Save States"),
+                     TinyString::FromFormat("Save%sState%u", global ? "Global" : "Game", slot),
+                     TinyString::FromFormat("Save %s State %u", global ? "Global" : "Game", slot),
+                     [this, global, slot](bool pressed) {
+                       if (!pressed)
+                         SaveState(global, slot);
+                     });
+    }
+  }
+}

src/frontend-common/common_host_interface.h

@@ -0,0 +1,65 @@
+#pragma once
+#include "core/host_interface.h"
+#include "common/string.h"
+#include <atomic>
+#include <functional>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <string_view>
+#include <utility>
+#include <optional>
+#include <vector>
+
+class CommonHostInterface : public HostInterface
+{
+public:
+  using HostKeyCode = s32;
+
+  using InputButtonHandler = std::function<void(bool)>;
+  using InputAxisHandler = std::function<void(float)>;
+
+  struct HotkeyInfo
+  {
+    String category;
+    String name;
+    String display_name;
+    InputButtonHandler handler;
+  };
+
+  using HotkeyInfoList = std::vector<HotkeyInfo>;
+
+  /// Returns a list of all available hotkeys.
+  const HotkeyInfoList& GetHotkeyInfoList() const { return m_hotkeys; }
+
+protected:
+  CommonHostInterface();
+  ~CommonHostInterface();
+
+  virtual void SetFullscreen(bool enabled);
+  virtual void ToggleFullscreen();
+
+  virtual std::unique_ptr<AudioStream> CreateAudioStream(AudioBackend backend) override;
+
+  virtual void SetDefaultSettings(SettingsInterface& si) override;
+
+  virtual std::optional<HostKeyCode> GetHostKeyCode(const std::string_view key_code) const;
+
+  void RegisterHotkey(String category, String name, String display_name, InputButtonHandler handler);
+  bool HandleHostKeyEvent(HostKeyCode code, bool pressed);
+  void UpdateInputMap(SettingsInterface& si);
+
+private:
+  void RegisterGeneralHotkeys();
+  void RegisterGraphicsHotkeys();
+  void RegisterSaveStateHotkeys();
+  void UpdateControllerInputMap(SettingsInterface& si);
+  void UpdateHotkeyInputMap(SettingsInterface& si);
+  void AddButtonToInputMap(const std::string& binding, InputButtonHandler handler);
+  void AddAxisToInputMap(const std::string& binding, InputAxisHandler handler);
+
+  HotkeyInfoList m_hotkeys;
+
+  // input key maps
+  std::map<HostKeyCode, InputButtonHandler> m_keyboard_input_handlers;
+};

src/frontend-common/frontend-common.vcxproj

@@ -46,6 +46,7 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="common_host_interface.cpp" />
     <ClCompile Include="icon.cpp" />
     <ClCompile Include="imgui_styles.cpp" />
     <ClCompile Include="sdl_audio_stream.cpp" />
@@ -53,6 +54,7 @@
     <ClCompile Include="sdl_initializer.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="common_host_interface.h" />
     <ClInclude Include="icon.h" />
     <ClInclude Include="imgui_styles.h" />
     <ClInclude Include="sdl_audio_stream.h" />

src/frontend-common/frontend-common.vcxproj.filters

@@ -6,6 +6,7 @@
     <ClCompile Include="sdl_audio_stream.cpp" />
     <ClCompile Include="sdl_controller_interface.cpp" />
     <ClCompile Include="sdl_initializer.cpp" />
+    <ClCompile Include="common_host_interface.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="icon.h" />
@@ -13,6 +14,7 @@
     <ClInclude Include="sdl_audio_stream.h" />
     <ClInclude Include="sdl_controller_interface.h" />
     <ClInclude Include="sdl_initializer.h" />
+    <ClInclude Include="common_host_interface.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="font_roboto_regular.inl" />