InputCommon: Clean up how numeric settings are handled. Add units of measure to UI. Eliminate hidden magic values of the IR cursor.

Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h

@@ -4,29 +4,127 @@
 
 #pragma once
 
+#include <atomic>
 #include <string>
 
 #include "Common/CommonTypes.h"
-#include "InputCommon/ControllerEmu/Setting/Setting.h"
+#include "Common/IniFile.h"
 #include "InputCommon/ControllerInterface/Device.h"
 
 namespace ControllerEmu
 {
-class NumericSetting
+enum class SettingType
+{
+  Double,
+  Bool,
+};
+
+struct NumericSettingDetails
+{
+  NumericSettingDetails(const char* const _ini_name, const char* const _ui_suffix = nullptr,
+                        const char* const _ui_description = nullptr,
+                        const char* const _ui_name = nullptr)
+      : ini_name(_ini_name), ui_suffix(_ui_suffix), ui_description(_ui_description),
+        ui_name(_ui_name ? _ui_name : _ini_name)
+  {
+  }
+
+  // The name used in ini files.
+  const char* const ini_name;
+
+  // A string applied to the number in the UI (unit of measure).
+  const char* const ui_suffix;
+
+  // Detailed description of the setting.
+  const char* const ui_description;
+
+  // The name used in the UI (if different from ini file).
+  const char* const ui_name;
+};
+
+class NumericSettingBase
 {
 public:
-  NumericSetting(const std::string& setting_name, const ControlState default_value,
-                 const u32 low = 0, const u32 high = 100,
-                 const SettingType setting_type = SettingType::NORMAL);
+  NumericSettingBase(const NumericSettingDetails& details);
 
-  ControlState GetValue() const;
-  void SetValue(ControlState value);
-  const SettingType m_type;
-  const std::string m_name;
-  const ControlState m_default_value;
-  const u32 m_low;
-  const u32 m_high;
-  ControlState m_value;
+  virtual ~NumericSettingBase() = default;
+
+  virtual void LoadFromIni(const IniFile::Section& section, const std::string& group_name) = 0;
+  virtual void SaveToIni(IniFile::Section& section, const std::string& group_name) const = 0;
+
+  virtual SettingType GetType() const = 0;
+
+  const char* GetUIName() const;
+  const char* GetUISuffix() const;
+  const char* GetUIDescription() const;
+
+protected:
+  NumericSettingDetails m_details;
+};
+
+template <typename T>
+class SettingValue;
+
+template <typename T>
+class NumericSetting : public NumericSettingBase
+{
+public:
+  using ValueType = T;
+
+  static_assert(std::is_same<ValueType, double>() || std::is_same<ValueType, bool>(),
+                "NumericSetting is only implemented for double and bool.");
+
+  NumericSetting(SettingValue<ValueType>* value, const NumericSettingDetails& details,
+                 ValueType default_value, ValueType min_value, ValueType max_value)
+      : NumericSettingBase(details), m_value(*value), m_default_value(default_value),
+        m_min_value(min_value), m_max_value(max_value)
+  {
+  }
+
+  void LoadFromIni(const IniFile::Section& section, const std::string& group_name) override
+  {
+    ValueType value;
+    section.Get(group_name + m_details.ini_name, &value, m_default_value);
+    SetValue(value);
+  }
+
+  void SaveToIni(IniFile::Section& section, const std::string& group_name) const override
+  {
+    section.Set(group_name + m_details.ini_name, GetValue(), m_default_value);
+  }
+
+  ValueType GetValue() const { return m_value.GetValue(); }
+  void SetValue(ValueType value) { m_value.SetValue(value); }
+
+  ValueType GetDefaultValue() const { return m_default_value; }
+  ValueType GetMinValue() const { return m_min_value; }
+  ValueType GetMaxValue() const { return m_max_value; }
+
+  SettingType GetType() const override;
+
+private:
+  SettingValue<ValueType>& m_value;
+
+  const ValueType m_default_value;
+  const ValueType m_min_value;
+  const ValueType m_max_value;
+};
+
+template <typename T>
+class SettingValue
+{
+  using ValueType = T;
+
+  friend class NumericSetting<T>;
+
+public:
+  ValueType GetValue() const { return m_value; }
+
+private:
+  void SetValue(ValueType value) { m_value = value; }
+
+  // Values are R/W by both UI and CPU threads.
+  std::atomic<ValueType> m_value;
 };
 
 }  // namespace ControllerEmu