holesome/src/game/input/input_mapper.cpp

#include "input_mapper.h"
#include "input_device_group.h"
#include "button_config_factory.hpp"


InputMapper::InputMapper()
{
    inputIdentities = std::set<std::shared_ptr<InputIdentity>>();
    newInputIdentities = std::set<std::shared_ptr<InputIdentity>>();
    deprecatedInputIdentities = std::set<std::shared_ptr<InputIdentity>>();
}


void InputMapper::processEvents()
{
    sf::Event event{};
    while (Game::getInstance()->window->pollEvent(event))
    {
        switch (event.type)
        {
            case sf::Event::KeyPressed:
                handleKeyPress(event.key);
                break;
            case sf::Event::KeyReleased:
                handleKeyRelease(event.key);
                break;
            case sf::Event::Closed:
                Game::getInstance()->exit();
                break;
            case sf::Event::JoystickButtonPressed:
                getInputIdentity(InputDeviceGroup::GAMEPAD, event.joystickButton.joystickId)->press(
                        ButtonConfigFactory::fromGamepadButton(event.joystickButton.button));
                break;
            case sf::Event::JoystickButtonReleased:
                getInputIdentity(InputDeviceGroup::GAMEPAD, event.joystickButton.joystickId)->release(
                        ButtonConfigFactory::fromGamepadButton(event.joystickButton.button));
                break;
            case sf::Event::JoystickMoved:
                handleJoystickMovement(event.joystickMove);
                break;
            case sf::Event::JoystickConnected:
                getInputIdentity(InputDeviceGroup::GAMEPAD, event.joystickConnect.joystickId);
                break;
            case sf::Event::JoystickDisconnected:
                deactivateIdentity(getInputIdentity(InputDeviceGroup::GAMEPAD, event.joystickConnect.joystickId));
                break;
            default:
                break;
        }
    }
}

void InputMapper::handleKeyPress(sf::Event::KeyEvent event)
{
    // Close game on Escape or Q in DEV Mode
    if (DEVELOPER_MODE && event.code == sf::Keyboard::Escape)
    {
        Game::getInstance()->exit();
        return;
    }

    // Handle directionVector
    auto button = ButtonConfigFactory::fromKey(event.code);
    if (button.deviceGroup != InputDeviceGroup::UNKNOWN)
    {
        getInputIdentity(button.deviceGroup)->press(button);
        return;
    }
}

void InputMapper::handleKeyRelease(sf::Event::KeyEvent event)
{
    auto button = ButtonConfigFactory::fromKey(event.code);
    if (button.deviceGroup != InputDeviceGroup::UNKNOWN)
    {
        getInputIdentity(button.deviceGroup)->release(button);
        return;
    }
}

void InputMapper::handleJoystickMovement(sf::Event::JoystickMoveEvent event)
{
    auto gamepadIdentity = getInputIdentity(InputDeviceGroup::GAMEPAD, event.joystickId);

    auto value = event.position / 100.f;    // Normalize to -1 to 1
    auto axis = event.axis;

    // Handle deadzone and joystick drift
    if (value > -JOYSTICK_DEADZONE && value < JOYSTICK_DEADZONE)
    {
        value = 0.f;
    }

    if (axis == sf::Joystick::Axis::X)
    {
        gamepadIdentity->direction.setX(value);
    } else if (axis == sf::Joystick::Axis::Y)
    {
        value *= -1;    // Is inverted
        gamepadIdentity->direction.setY(value);
    }
}

std::shared_ptr<InputIdentity> InputMapper::getInputIdentity(InputDeviceGroup deviceGroup, unsigned int gamepadId)
{
    if (deviceGroup == InputDeviceGroup::UNKNOWN)
    {
        throw std::invalid_argument("InputDeviceGroup cannot be UNKNOWN");
    }

    for (auto &identity: inputIdentities)
    {
        // Device group must be matched, and gamepad id if it is a gamepad
        if (identity->deviceGroup == deviceGroup &&
            (deviceGroup != InputDeviceGroup::GAMEPAD ||
             identity->gamepadId == gamepadId))
        {
            return identity;
        }
    }

    // No identity found, create new
    auto newIdentity = std::make_shared<InputIdentity>(deviceGroup, gamepadId);
    inputIdentities.insert(newIdentity);
    newInputIdentities.insert(newIdentity);
    return newIdentity;
}

void InputMapper::deactivateIdentity(const std::shared_ptr<InputIdentity> &identity)
{
    LOG(INFO) << "Destroyed input identity [" << magic_enum::enum_name(identity->deviceGroup) << ", gamepad "
              << identity->gamepadId
              << "]";

    identity->isActive = false;
    deprecatedInputIdentities.insert(identity);
    inputIdentities.erase(identity);
}

std::shared_ptr<InputMapper> InputMapper::getInstance()
{
    if (singletonInstance == nullptr)
    {
        singletonInstance = std::make_shared<InputMapper>();
    }

    return singletonInstance;
}

std::set<std::shared_ptr<InputIdentity>> InputMapper::getInputIdentities()
{
    return inputIdentities;
}

void InputMapper::updateIdentities()
{
    for (auto &identity: inputIdentities)
    {
        identity->update();
    }

    newInputIdentities.clear();
    deprecatedInputIdentities.clear();
}