Core: Add Free Look controllers that are initialized at boot

Source/Core/Core/FreeLookManager.h

@@ -0,0 +1,57 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "Common/CommonTypes.h"
+#include "InputCommon/ControllerEmu/ControllerEmu.h"
+
+class InputConfig;
+
+namespace ControllerEmu
+{
+class ControlGroup;
+class Buttons;
+}  // namespace ControllerEmu
+
+enum class FreeLookGroup
+{
+  Move,
+  Speed,
+  FieldOfView,
+  Other
+};
+
+namespace FreeLook
+{
+void Shutdown();
+void Initialize();
+void LoadInputConfig();
+bool IsInitialized();
+void UpdateInput();
+
+InputConfig* GetInputConfig();
+ControllerEmu::ControlGroup* GetInputGroup(int pad_num, FreeLookGroup group);
+
+}  // namespace FreeLook
+
+class FreeLookController final : public ControllerEmu::EmulatedController
+{
+public:
+  explicit FreeLookController(unsigned int index);
+
+  std::string GetName() const override;
+  void LoadDefaults(const ControllerInterface& ciface) override;
+
+  ControllerEmu::ControlGroup* GetGroup(FreeLookGroup group) const;
+  void Update();
+
+private:
+  ControllerEmu::Buttons* m_move_buttons;
+  ControllerEmu::Buttons* m_speed_buttons;
+  ControllerEmu::Buttons* m_fov_buttons;
+  ControllerEmu::Buttons* m_other_buttons;
+
+  const unsigned int m_index;
+};