NeGcon: Add steering axis deadzone setting

src/core/controller.cpp

@@ -216,6 +216,9 @@ Controller::SettingList Controller::GetSettings(ControllerType type)
     case ControllerType::NamcoGunCon:
       return NamcoGunCon::StaticGetSettings();
 
+    case ControllerType::NeGcon:
+      return NeGcon::StaticGetSettings();
+
     default:
       return {};
   }

src/core/negcon.cpp

@@ -52,7 +52,11 @@ void NeGcon::SetAxisState(s32 axis_code, float value)
   // Steering Axis: -1..1 -> 0..255
   if (axis_code == static_cast<s32>(Axis::Steering))
   {
-    const u8 u8_value = static_cast<u8>(std::clamp(((value + 1.0f) / 2.0f) * 255.0f, 0.0f, 255.0f));
+    const float float_value =
+      (std::abs(value) < m_steering_deadzone) ?
+        0.0f :
+        std::copysign((std::abs(value) - m_steering_deadzone) / (1.0f - m_steering_deadzone), value);
+    const u8 u8_value = static_cast<u8>(std::clamp(((float_value + 1.0f) / 2.0f) * 255.0f, 0.0f, 255.0f));
 
     SetAxisState(static_cast<Axis>(axis_code), u8_value);
 
@@ -242,3 +246,18 @@ u32 NeGcon::StaticGetVibrationMotorCount()
 {
   return 0;
 }
+
+Controller::SettingList NeGcon::StaticGetSettings()
+{
+  static constexpr std::array<SettingInfo, 1> settings = {
+    {SettingInfo::Type::Float, "SteeringDeadzone", TRANSLATABLE("NeGcon", "Steering Axis Deadzone"),
+     TRANSLATABLE("NeGcon", "Sets deadzone size for steering axis."), "0.00f", "0.00f", "0.99f", "0.01f"}};
+
+  return SettingList(settings.begin(), settings.end());
+}
+
+void NeGcon::LoadSettings(const char* section)
+{
+  Controller::LoadSettings(section);
+  m_steering_deadzone = g_host_interface->GetFloatSettingValue(section, "SteeringDeadzone", 0.10f);
+}

src/core/negcon.h

@@ -39,6 +39,7 @@ 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;
@@ -56,6 +57,8 @@ public:
   void SetAxisState(Axis axis, u8 value);
   void SetButtonState(Button button, bool pressed);
 
+  void LoadSettings(const char* section) override;
+
 private:
   enum class TransferState : u8
   {
@@ -75,4 +78,6 @@ private:
   u16 m_button_state = UINT16_C(0xFFFF);
 
   TransferState m_transfer_state = TransferState::Idle;
+
+  float m_steering_deadzone = 0.00f;
 };