DigitalController: Add option to force as Pop'n Controller

src/core/controller.cpp

@@ -234,6 +234,9 @@ Controller::SettingList Controller::GetSettings(ControllerType type)
 {
   switch (type)
   {
+    case ControllerType::DigitalController:
+      return DigitalController::StaticGetSettings();
+
     case ControllerType::AnalogController:
       return AnalogController::StaticGetSettings();
 

src/core/digital_controller.cpp

@@ -96,7 +96,7 @@ bool DigitalController::Transfer(const u8 data_in, u8* data_out)
 
     case TransferState::ButtonsLSB:
     {
-      *data_out = Truncate8(m_button_state);
+      *data_out = Truncate8(m_button_state) & GetButtonsLSBMask();
       m_transfer_state = TransferState::ButtonsMSB;
       return true;
     }
@@ -181,3 +181,26 @@ u32 DigitalController::StaticGetVibrationMotorCount()
 {
   return 0;
 }
+
+Controller::SettingList DigitalController::StaticGetSettings()
+{
+  static constexpr std::array<SettingInfo, 1> settings = {
+    {{SettingInfo::Type::Boolean, "ForcePopnControllerMode",
+      TRANSLATABLE("DigitalController", "Force Pop'n Controller Mode"),
+      TRANSLATABLE("DigitalController", "Forces the Digital Controller to act as a Pop'n Controller."), "false"}}};
+  return SettingList(settings.begin(), settings.end());
+}
+
+void DigitalController::LoadSettings(const char* section)
+{
+  Controller::LoadSettings(section);
+  m_popn_controller_mode = g_host_interface->GetBoolSettingValue(section, "ForcePopnControllerMode", false);
+}
+
+u8 DigitalController::GetButtonsLSBMask() const
+{
+  constexpr u8 popn_controller_mask =
+    ~(u8(1) << static_cast<u8>(Button::Right) | u8(1) << static_cast<u8>(Button::Down) |
+      u8(1) << static_cast<u8>(Button::Left));
+  return m_popn_controller_mode ? popn_controller_mask : 0xFF;
+}

src/core/digital_controller.h

@@ -37,6 +37,7 @@ public:
   static AxisList StaticGetAxisNames();
   static ButtonList StaticGetButtonNames();
   static u32 StaticGetVibrationMotorCount();
+  static SettingList StaticGetSettings();
 
   ControllerType GetType() const override;
   std::optional<s32> GetAxisCodeByName(std::string_view axis_name) const override;
@@ -54,6 +55,8 @@ public:
 
   void SetButtonState(Button button, bool pressed);
 
+  void LoadSettings(const char* section) override;
+
 private:
   enum class TransferState : u8
   {
@@ -67,4 +70,8 @@ private:
   u16 m_button_state = UINT16_C(0xFFFF);
 
   TransferState m_transfer_state = TransferState::Idle;
+
+  bool m_popn_controller_mode = false;
+
+  u8 GetButtonsLSBMask() const;
 };