////  Joystick.cpp//  interface/src/devices////  Created by Stephen Birarda on 2014-09-23.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <limits> #include <glm/glm.hpp> #include "Joystick.h"  #ifdef HAVE_SDL2const float MAX_AXIS = 32768.0f; Joystick::Joystick(SDL_JoystickID instanceId, const QString& name, SDL_GameController* sdlGameController) :    _sdlGameController(sdlGameController),    _sdlJoystick(SDL_GameControllerGetJoystick(_sdlGameController)),    _instanceId(instanceId),    _name(name),    _axes(QVector<float>(SDL_JoystickNumAxes(_sdlJoystick))),    _buttons(QVector<bool>(SDL_JoystickNumButtons(_sdlJoystick))){    } #endif Joystick::~Joystick() {    closeJoystick();} void Joystick::closeJoystick() {#ifdef HAVE_SDL2    SDL_GameControllerClose(_sdlGameController);#endif}  #ifdef HAVE_SDL2void Joystick::handleAxisEvent(const SDL_ControllerAxisEvent& event) {    if (_axes.size() <= event.axis) {        _axes.resize(event.axis + 1);    }        float oldValue = _axes[event.axis];    float newValue = event.value / MAX_AXIS;    _axes[event.axis] = newValue;        emit axisValueChanged(event.axis, newValue, oldValue);} void Joystick::handleButtonEvent(const SDL_ControllerButtonEvent& event) {    bool oldValue = _buttons[event.button];    bool newValue = event.state == SDL_PRESSED;    _buttons[event.button] = newValue;    emit buttonStateChanged(event.button, newValue, oldValue);}#endif