gamepad.hpp

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#pragma once
#include <GLFW/glfw3.h>
#include <klib/c_string.hpp>
#include <array>
#include <optional>
#include <variant>
 
namespace le::input {
inline constexpr std::size_t max_gamepads_v = GLFW_JOYSTICK_16;
 
class Gamepad {
  public:
    static constexpr float dead_zone_v = 0.08f;
    static constexpr float nonzero_dead_zone_v = 0.2f;
 
    class Manager;
 
    enum struct Id : std::int8_t {};
    struct FirstUsed {};
    struct LastUsed {};
    using Binding = std::variant<FirstUsed, LastUsed, Id>;
 
    [[nodiscard]] auto get_id() const -> Id { return m_id; }
    [[nodiscard]] auto is_connected() const -> bool { return m_connected; }
    [[nodiscard]] auto get_name() const -> klib::CString;
 
    [[nodiscard]] auto any_button_pressed() const -> bool;
    [[nodiscard]] auto any_axis_nonzero(float dead_zone = nonzero_dead_zone_v) const -> bool;
    [[nodiscard]] auto is_pressed(int button) const -> bool;
    [[nodiscard]] auto get_axis(int axis, float dead_zone = dead_zone_v) const -> float;
 
  private:
    GLFWgamepadstate m_state{};
    Id m_id{-1};
    bool m_connected{};
};
 
class Gamepad::Manager {
  public:
    explicit Manager();
 
    [[nodiscard]] auto get_by_id(Id id) const -> Gamepad const&;
    [[nodiscard]] auto get_first_used() const -> Gamepad const&;
    [[nodiscard]] auto get_last_used() const -> Gamepad const&;
    [[nodiscard]] auto get(Binding binding) const -> Gamepad const&;
 
    auto update(float nonzero_dead_zone = nonzero_dead_zone_v) -> bool;
 
  private:
    std::array<Gamepad, max_gamepads_v> m_gamepads{};
    std::optional<Gamepad::Id> m_first_used{};
    std::optional<Gamepad::Id> m_last_used{};
};
} // namespace le::input