mxvk_controller.cpp

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/**
 * @file mxvk_controller.cpp
 * @brief Implementation of mxvk::VK_Joystick and mxvk::VK_Controller SDL3 wrappers.
 */
 
#include "mxvk/mxvk_controller.hpp"
 
#include "mxvk/mxvk_exception.hpp"
 
#include <SDL3/SDL_stdinc.h>
 
namespace mxvk {
 
    VK_Joystick::VK_Joystick() = default;
 
    VK_Joystick::~VK_Joystick() noexcept {
        close();
    }
 
    int VK_Joystick::joysticks() {
        int count = 0;
        SDL_JoystickID *ids = SDL_GetJoysticks(&count);
        if (ids != nullptr) {
            SDL_free(ids);
        }
        return count;
    }
 
    bool VK_Joystick::open(const int index) {
        close();
 
        int count = 0;
        SDL_JoystickID *ids = SDL_GetJoysticks(&count);
        if (ids == nullptr || index < 0 || index >= count) {
            if (ids != nullptr) {
                SDL_free(ids);
            }
            return false;
        }
 
        const SDL_JoystickID openedInstanceId = ids[index];
        SDL_free(ids);
 
        stick = SDL_OpenJoystick(openedInstanceId);
        if (stick == nullptr) {
            return false;
        }
 
        deviceIndex = index;
        instanceId = openedInstanceId;
        SDL_SetJoystickEventsEnabled(true);
        return true;
    }
 
    std::string VK_Joystick::name() const {
        if (stick != nullptr) {
            const char *device_name = SDL_GetJoystickName(stick);
            if (device_name != nullptr) {
                return device_name;
            }
        }
        return "Joystick Not Opened.";
    }
 
    void VK_Joystick::close() {
        if (stick != nullptr) {
            SDL_CloseJoystick(stick);
        }
 
        stick = nullptr;
        deviceIndex = -1;
        instanceId = 0;
    }
 
    std::optional<SDL_Joystick *> VK_Joystick::handle() const {
        if (stick != nullptr) {
            return stick;
        }
        return std::nullopt;
    }
 
    SDL_Joystick *VK_Joystick::unwrap() const {
        if (stick != nullptr) {
            return stick;
        }
        throw mxvk::Exception("Invalid joystick handle");
    }
 
    int VK_Joystick::joystickIndex() const {
        return deviceIndex;
    }
 
    bool VK_Joystick::getButton(const int button) const {
        if (stick == nullptr) {
            return false;
        }
        return SDL_GetJoystickButton(stick, button);
    }
 
    Uint8 VK_Joystick::getHat(const int hat) const {
        if (stick == nullptr) {
            return 0;
        }
        return SDL_GetJoystickHat(stick, hat);
    }
 
    Sint16 VK_Joystick::getAxis(const int axis) const {
        if (stick == nullptr) {
            return 0;
        }
        return SDL_GetJoystickAxis(stick, axis);
    }
 
    int VK_Joystick::numButtons() const {
        if (stick == nullptr) {
            return 0;
        }
        const int count = SDL_GetNumJoystickButtons(stick);
        return count < 0 ? 0 : count;
    }
 
    int VK_Joystick::numHats() const {
        if (stick == nullptr) {
            return 0;
        }
        const int count = SDL_GetNumJoystickHats(stick);
        return count < 0 ? 0 : count;
    }
 
    int VK_Joystick::numAxes() const {
        if (stick == nullptr) {
            return 0;
        }
        const int count = SDL_GetNumJoystickAxes(stick);
        return count < 0 ? 0 : count;
    }
 
    VK_Controller::VK_Controller() = default;
 
    VK_Controller::~VK_Controller() noexcept {
        close();
    }
 
    int VK_Controller::joysticks() {
        int count = 0;
        SDL_JoystickID *ids = SDL_GetGamepads(&count);
        if (ids != nullptr) {
            SDL_free(ids);
        }
        return count;
    }
 
    bool VK_Controller::openByInstanceId(const SDL_JoystickID newInstanceId, const int index_hint) {
        close();
 
        stick = SDL_OpenGamepad(newInstanceId);
        if (stick == nullptr) {
            return false;
        }
 
        deviceIndex = index_hint;
        instanceId = newInstanceId;
        SDL_SetGamepadEventsEnabled(true);
        return true;
    }
 
    bool VK_Controller::open(const int index) {
        int count = 0;
        SDL_JoystickID *ids = SDL_GetGamepads(&count);
        if (ids == nullptr || index < 0 || index >= count) {
            if (ids != nullptr) {
                SDL_free(ids);
            }
            return false;
        }
 
        const SDL_JoystickID openedInstanceId = ids[index];
        SDL_free(ids);
        return openByInstanceId(openedInstanceId, index);
    }
 
    std::string VK_Controller::name() const {
        if (stick != nullptr) {
            const char *device_name = SDL_GetGamepadName(stick);
            if (device_name != nullptr) {
                return device_name;
            }
        }
        return "Controller Not Opened.";
    }
 
    void VK_Controller::close() {
        if (stick != nullptr) {
            SDL_CloseGamepad(stick);
        }
 
        stick = nullptr;
        deviceIndex = -1;
        instanceId = 0;
    }
 
    std::optional<SDL_Gamepad *> VK_Controller::handle() const {
        if (stick != nullptr) {
            return stick;
        }
        return std::nullopt;
    }
 
    SDL_Gamepad *VK_Controller::unwrap() const {
        if (stick != nullptr) {
            return stick;
        }
        throw mxvk::Exception("Invalid controller handle");
    }
 
    int VK_Controller::controllerIndex() const {
        return deviceIndex;
    }
 
    bool VK_Controller::getButton(const SDL_GamepadButton button) const {
        if (stick == nullptr) {
            return false;
        }
        return SDL_GetGamepadButton(stick, button);
    }
 
    Uint8 VK_Controller::getHat(const int hat) const {
        if (stick == nullptr) {
            return 0;
        }
 
        SDL_Joystick *joystick = SDL_GetGamepadJoystick(stick);
        if (joystick == nullptr) {
            return 0;
        }
        return SDL_GetJoystickHat(joystick, hat);
    }
 
    Sint16 VK_Controller::getAxis(const SDL_GamepadAxis axis) const {
        if (stick == nullptr) {
            return 0;
        }
        return SDL_GetGamepadAxis(stick, axis);
    }
 
    bool VK_Controller::active() const {
        return stick != nullptr && SDL_GamepadConnected(stick);
    }
 
    bool VK_Controller::connectEvent(SDL_Event &e) {
        if (e.type == SDL_EVENT_GAMEPAD_ADDED) {
            return openByInstanceId(e.gdevice.which);
        }
 
        if (e.type == SDL_EVENT_GAMEPAD_REMOVED) {
            if (stick != nullptr && instanceId == e.gdevice.which) {
                close();
            }
            return true;
        }
 
        return false;
    }
 
} // namespace mxvk