Duckstation/src/core/digital_controller.h

// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com> and contributors.
// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)

#pragma once
#include "controller.h"
#include <memory>
#include <optional>
#include <string_view>

class DigitalController final : public Controller
{
public:
  enum class Button : u8
  {
    Select = 0,
    L3 = 1,
    R3 = 2,
    Start = 3,
    Up = 4,
    Right = 5,
    Down = 6,
    Left = 7,
    L2 = 8,
    R2 = 9,
    L1 = 10,
    R1 = 11,
    Triangle = 12,
    Circle = 13,
    Cross = 14,
    Square = 15,
    Count
  };

  static const Controller::ControllerInfo INFO;

  DigitalController(u32 index);
  ~DigitalController() override;

  static std::unique_ptr<DigitalController> Create(u32 index);

  ControllerType GetType() const override;

  void Reset() override;
  bool DoState(StateWrapper& sw, bool apply_input_state) override;

  float GetBindState(u32 index) const override;
  void SetBindState(u32 index, float value) override;
  u32 GetButtonStateBits() const override;

  void ResetTransferState() override;
  bool Transfer(const u8 data_in, u8* data_out) override;

  void LoadSettings(SettingsInterface& si, const char* section) override;

private:
  enum class TransferState : u8
  {
    Idle,
    Ready,
    IDMSB,
    ButtonsLSB,
    ButtonsMSB
  };

  // buttons are active low
  u16 m_button_state = UINT16_C(0xFFFF);

  TransferState m_transfer_state = TransferState::Idle;

  bool m_popn_controller_mode = false;

  u8 GetButtonsLSBMask() const;
};