Justifier: Add controller implementation

src/core/justifier.h

@@ -0,0 +1,108 @@
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// 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 TimingEvent;
+
+class Justifier final : public Controller
+{
+public:
+  enum class Binding : u8
+  {
+    Trigger = 0,
+    Start = 1,
+    Back = 2,
+    ShootOffscreen = 3,
+    ButtonCount = 4,
+
+    RelativeLeft = 4,
+    RelativeRight = 5,
+    RelativeUp = 6,
+    RelativeDown = 7,
+    BindingCount = 8,
+  };
+
+  static const Controller::ControllerInfo INFO;
+
+  Justifier(u32 index);
+  ~Justifier() override;
+
+  static std::unique_ptr<Justifier> Create(u32 index);
+
+  ControllerType GetType() const override;
+
+  void Reset() override;
+  bool DoState(StateWrapper& sw, bool apply_input_state) override;
+
+  void LoadSettings(SettingsInterface& si, const char* section) override;
+
+  float GetBindState(u32 index) const override;
+  void SetBindState(u32 index, float value) override;
+
+  void ResetTransferState() override;
+  bool Transfer(const u8 data_in, u8* data_out) override;
+
+private:
+  bool IsTriggerPressed() const;
+  void UpdatePosition();
+  void UpdateIRQEvent();
+  void IRQEvent();
+
+  std::pair<float, float> GetAbsolutePositionFromRelativeAxes() const;
+  bool CanUseSoftwareCursor() const;
+  u32 GetSoftwarePointerIndex() const;
+  void UpdateSoftwarePointerPosition();
+
+  enum class TransferState : u8
+  {
+    Idle,
+    IDMSB,
+    ButtonsLSB,
+    ButtonsMSB,
+    XLSB,
+    XMSB,
+    YLSB,
+    YMSB
+  };
+
+  static constexpr s8 DEFAULT_FIRST_LINE_OFFSET = -12;
+  static constexpr s8 DEFAULT_LAST_LINE_OFFSET = -6;
+  static constexpr s16 DEFAULT_TICK_OFFSET = 50;
+  static constexpr u8 DEFAULT_OFFSCREEN_OOB_FRAMES = 5;
+  static constexpr u8 DEFAULT_OFFSCREEN_TRIGGER_FRAMES = 5;
+  static constexpr u8 DEFAULT_OFFSCREEN_RELEASE_FRAMES = 5;
+
+  std::unique_ptr<TimingEvent> m_irq_event;
+
+  s8 m_first_line_offset = 0;
+  s8 m_last_line_offset = 0;
+  s16 m_tick_offset = 0;
+
+  u8 m_offscreen_oob_frames = 0;
+  u8 m_offscreen_trigger_frames = 0;
+  u8 m_offscreen_release_frames = 0;
+
+  u16 m_irq_first_line = 0;
+  u16 m_irq_last_line = 0;
+  u16 m_irq_tick = 0;
+
+  // buttons are active low
+  u16 m_button_state = UINT16_C(0xFFFF);
+  u8 m_shoot_offscreen = 0;
+  bool m_position_valid = false;
+
+  TransferState m_transfer_state = TransferState::Idle;
+
+  bool m_has_relative_binds = false;
+  float m_relative_pos[4] = {};
+
+  std::string m_cursor_path;
+  float m_cursor_scale = 1.0f;
+  u32 m_cursor_color = 0xFFFFFFFFu;
+  float m_x_scale = 1.0f;
+};