Controller: Support general axis input events

src/core/controller.cpp

@@ -21,6 +21,8 @@ bool Controller::Transfer(const u8 data_in, u8* data_out)
   return false;
 }
 
+void Controller::SetAxisState(s32 axis_code, float value) {}
+
 void Controller::SetButtonState(s32 button_code, bool pressed) {}
 
 std::unique_ptr<Controller> Controller::Create(ControllerType type)
@@ -38,6 +40,24 @@ std::unique_ptr<Controller> Controller::Create(ControllerType type)
   }
 }
 
+std::optional<s32> Controller::GetAxisCodeByName(std::string_view button_name) const
+{
+  return std::nullopt;
+}
+
+std::optional<s32> Controller::GetAxisCodeByName(ControllerType type, std::string_view axis_name)
+{
+  switch (type)
+  {
+    case ControllerType::DigitalController:
+      return DigitalController::StaticGetAxisCodeByName(axis_name);
+
+    case ControllerType::None:
+    default:
+      return std::nullopt;
+  }
+}
+
 std::optional<s32> Controller::GetButtonCodeByName(ControllerType type, std::string_view button_name)
 {
   switch (type)

src/core/controller.h

@@ -15,6 +15,9 @@ public:
   /// Returns the type of controller.
   virtual ControllerType GetType() const = 0;
 
+  /// Gets the integer code for an axis in the specified controller type.
+  virtual std::optional<s32> GetAxisCodeByName(std::string_view axis_name) const;
+
   /// Gets the integer code for a button in the specified controller type.
   virtual std::optional<s32> GetButtonCodeByName(std::string_view button_name) const;
 
@@ -27,12 +30,18 @@ public:
   // Returns the value of ACK, as well as filling out_data.
   virtual bool Transfer(const u8 data_in, u8* data_out);
 
+  /// Changes the specified axis state. Values are normalized from -1..1.
+  virtual void SetAxisState(s32 axis_code, float value);
+
   /// Changes the specified button state.
   virtual void SetButtonState(s32 button_code, bool pressed);
 
   /// Creates a new controller of the specified type.
   static std::unique_ptr<Controller> Create(ControllerType type);
 
+  /// Gets the integer code for an axis in the specified controller type.
+  static std::optional<s32> GetAxisCodeByName(ControllerType type, std::string_view axis_name);
+
   /// Gets the integer code for a button in the specified controller type.
   static std::optional<s32> GetButtonCodeByName(ControllerType type, std::string_view button_name);
 };

src/core/digital_controller.cpp

@@ -11,11 +11,18 @@ ControllerType DigitalController::GetType() const
   return ControllerType::DigitalController;
 }
 
+std::optional<s32> DigitalController::GetAxisCodeByName(std::string_view axis_name) const
+{
+  return StaticGetAxisCodeByName(axis_name);
+}
+
 std::optional<s32> DigitalController::GetButtonCodeByName(std::string_view button_name) const
 {
   return StaticGetButtonCodeByName(button_name);
 }
 
+void DigitalController::SetAxisState(s32 axis_code, float value) {}
+
 void DigitalController::SetButtonState(Button button, bool pressed)
 {
   if (pressed)
@@ -91,6 +98,11 @@ std::unique_ptr<DigitalController> DigitalController::Create()
   return std::make_unique<DigitalController>();
 }
 
+std::optional<s32> DigitalController::StaticGetAxisCodeByName(std::string_view button_name)
+{
+  return std::nullopt;
+}
+
 std::optional<s32> DigitalController::StaticGetButtonCodeByName(std::string_view button_name)
 {
 #define BUTTON(name)                                                                                                   \

src/core/digital_controller.h

@@ -32,17 +32,21 @@ public:
   ~DigitalController() override;
 
   static std::unique_ptr<DigitalController> Create();
+  static std::optional<s32> StaticGetAxisCodeByName(std::string_view button_name);
   static std::optional<s32> StaticGetButtonCodeByName(std::string_view button_name);
 
   ControllerType GetType() const override;
+  std::optional<s32> GetAxisCodeByName(std::string_view axis_name) const override;
   std::optional<s32> GetButtonCodeByName(std::string_view button_name) const override;
 
-  void SetButtonState(Button button, bool pressed);
-  void SetButtonState(s32 button_code, bool pressed);
+  void SetAxisState(s32 axis_code, float value) override;
+  void SetButtonState(s32 button_code, bool pressed) override;
 
   void ResetTransferState() override;
   bool Transfer(const u8 data_in, u8* data_out) override;
 
+  void SetButtonState(Button button, bool pressed);
+
 private:
   enum class TransferState : u8
   {

src/duckstation/sdl_host_interface.cpp

@@ -459,7 +459,7 @@ void SDLHostInterface::UpdateKeyboardControllerMapping()
 {
   m_keyboard_button_mapping.fill(-1);
 
-  const Controller* controller = m_system->GetController(0);
+  const Controller* controller = m_system ? m_system->GetController(0) : nullptr;
   if (controller)
   {
 #define SET_BUTTON_MAP(action, name)                                                                                   \
@@ -490,7 +490,8 @@ bool SDLHostInterface::HandleSDLKeyEventForController(const SDL_Event* event)
   Controller* controller;
 
 #define DO_ACTION(action)                                                                                              \
-  if ((controller = m_system->GetController(0)) != nullptr && m_keyboard_button_mapping[static_cast<int>(action)])     \
+  if ((controller = m_system ? m_system->GetController(0) : nullptr) != nullptr &&                                     \
+      m_keyboard_button_mapping[static_cast<int>(action)])                                                             \
   {                                                                                                                    \
     controller->SetButtonState(m_keyboard_button_mapping[static_cast<int>(action)], pressed);                          \
   }
@@ -563,13 +564,22 @@ bool SDLHostInterface::HandleSDLKeyEventForController(const SDL_Event* event)
 
 void SDLHostInterface::UpdateControllerControllerMapping()
 {
+  m_controller_axis_mapping.fill(-1);
   m_controller_button_mapping.fill(-1);
 
-  const Controller* controller = m_system->GetController(0);
+  Controller* controller = m_system ? m_system->GetController(0) : nullptr;
   if (controller)
   {
-#define SET_BUTTON_MAP(action, name)                                                                                   \
-  m_controller_button_mapping[static_cast<int>(action)] = controller->GetButtonCodeByName(name).value_or(-1)
+#define SET_AXIS_MAP(axis, name) m_controller_axis_mapping[axis] = controller->GetAxisCodeByName(name).value_or(-1)
+#define SET_BUTTON_MAP(button, name)                                                                                   \
+  m_controller_button_mapping[button] = controller->GetButtonCodeByName(name).value_or(-1)
+
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_LEFTX, "LeftX");
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_LEFTY, "LeftY");
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_RIGHTX, "RightX");
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_RIGHTY, "RightY");
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_TRIGGERLEFT, "LeftTrigger");
+    SET_AXIS_MAP(SDL_CONTROLLER_AXIS_TRIGGERRIGHT, "RightTrigger");
 
     SET_BUTTON_MAP(SDL_CONTROLLER_BUTTON_DPAD_UP, "Up");
     SET_BUTTON_MAP(SDL_CONTROLLER_BUTTON_DPAD_DOWN, "Down");
@@ -586,6 +596,7 @@ void SDLHostInterface::UpdateControllerControllerMapping()
     SET_BUTTON_MAP(SDL_CONTROLLER_BUTTON_START, "Start");
     SET_BUTTON_MAP(SDL_CONTROLLER_BUTTON_BACK, "Select");
 
+#undef SET_AXIS_MAP
 #undef SET_BUTTON_MAP
   }
 }
@@ -593,10 +604,19 @@ void SDLHostInterface::UpdateControllerControllerMapping()
 void SDLHostInterface::HandleSDLControllerAxisEventForController(const SDL_Event* ev)
 {
   // Log_DevPrintf("axis %d %d", ev->caxis.axis, ev->caxis.value);
-  Controller* controller = m_system->GetController(0);
+  Controller* controller = m_system ? m_system->GetController(0) : nullptr;
   if (!controller)
     return;
 
+  // proper axis mapping
+  if (m_controller_axis_mapping[ev->caxis.axis] >= 0)
+  {
+    const float value = static_cast<float>(ev->caxis.value) / (ev->caxis.value < 0 ? 32768.0f : 32767.0f);
+    controller->SetAxisState(m_controller_axis_mapping[ev->caxis.axis], value);
+    return;
+  }
+
+  // axis-as-button mapping
   static constexpr int deadzone = 8192;
   const bool negative = (ev->caxis.value < 0);
   const bool active = (std::abs(ev->caxis.value) >= deadzone);

src/duckstation/sdl_host_interface.h

@@ -125,6 +125,7 @@ private:
   KeyboardControllerActionMap m_keyboard_button_mapping;
 
   std::map<int, SDL_GameController*> m_sdl_controllers;
+  std::array<s32, SDL_CONTROLLER_AXIS_MAX> m_controller_axis_mapping;
   std::array<s32, SDL_CONTROLLER_BUTTON_MAX> m_controller_button_mapping;
 
   u32 m_switch_gpu_renderer_event_id = 0;