JoystickManager.h

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#pragma once
 
#include "message.h"
#include <SDL3/SDL.h>
#include <unordered_map>
#include <vector>
#include <string>
#include <mutex>
 
// Forward declare to access constant
struct Controller_data;
 
class JoystickManager 
{
public:
    static constexpr int MAX_BUTTONS = 16; // Must match Controller_data::MAX_BUTTONS
    static constexpr int MAX_AXES = 6;
public:
    JoystickManager()
    {
        name = "JoystickManager";
        Initialize();
    }
    virtual ~JoystickManager()
    {
        Shutdown();
    }
 
    static JoystickManager& GetInstance();
    static JoystickManager& Get() { return GetInstance(); }
 
    // Initialize joystick subsystem and open currently connected devices
    void Initialize();
    void Scan_Joysticks();
    void Shutdown();
 
    // Process per-frame (optional)
    void Process(float dt);
 
    // Handle an incoming SDL_Event (forwarded from the application event pump)
    void HandleEvent(const SDL_Event* ev);
 
    // Query
    std::vector<SDL_JoystickID> GetConnectedJoysticks();
    bool IsJoystickConnected(SDL_JoystickID id);
 
    // Pull API for reading joystick state
    void BeginFrame();
    bool GetButton(SDL_JoystickID id, int button) ;
    bool IsButtonPressed(SDL_JoystickID id, int button) ;
    bool IsButtonReleased(SDL_JoystickID id, int button) ;
    float GetAxis(SDL_JoystickID id, int axis) ;
 
private:
    std::string name;
 
    struct JoystickInfo
    {
        SDL_Joystick* joystick = nullptr;
        SDL_JoystickID id = 0;
        std::string name;
        int numAxes = 0;
        int numButtons = 0;
        std::vector<Sint16> axes;
        std::vector<bool> buttons;
    };
 
    // State tracking for pull API
    struct JoystickState
    {
        bool connected = false;
        float axes[MAX_AXES] = {0};
        bool buttons[MAX_BUTTONS] = {false};
        bool buttonsPressed[MAX_BUTTONS] = {false};
        bool buttonsReleased[MAX_BUTTONS] = {false};
    };
 
    std::unordered_map<SDL_JoystickID, JoystickInfo> m_joysticks;
    std::unordered_map<SDL_JoystickID, JoystickState> m_joyStates;
    std::mutex m_mutex;
 
    void OpenJoystick(SDL_JoystickID instance_id);
    void CloseJoystick(SDL_JoystickID instance_id);
    void PostJoystickButtonEvent(SDL_JoystickID which, int button, bool down);
    void PostJoystickAxisEvent(SDL_JoystickID which, int axis, Sint16 value);
    void PostJoystickConnectedEvent(SDL_JoystickID which, bool bconnected);
};