Restructuring + Initial Android handler

qgroundcontrol.pro

@@ -315,6 +315,11 @@ HEADERS += \
     src/QtLocationPlugin/QMLControl/QGCMapEngineManager.h \
     src/PositionManager/PositionManager.h
 
+AndroidBuild {
+HEADERS += \
+    src/Joystick/JoystickAndroid.h \
+}
+
 DebugBuild {
 HEADERS += \
     src/comm/MockLink.h \
@@ -347,6 +352,7 @@ HEADERS += \
     src/comm/QGCHilLink.h \
     src/comm/QGCJSBSimLink.h \
     src/comm/QGCXPlaneLink.h \
+    src/Joystick/JoystickSDL.h \
     src/QGCFileDialog.h \
     src/QGCMessageBox.h \
     src/uas/FileManager.h \
@@ -403,8 +409,10 @@ iOSBuild {
         src/audio/QGCAudioWorker_iOS.mm \
         src/MobileScreenMgr.mm \
 }
+
 AndroidBuild {
     SOURCES += src/MobileScreenMgr.cc \
+        src/Joystick/JoystickAndroid.cc \
 }
 
 
@@ -502,6 +510,7 @@ SOURCES += \
     src/comm/QGCFlightGearLink.cc \
     src/comm/QGCJSBSimLink.cc \
     src/comm/QGCXPlaneLink.cc \
+    src/Joystick/JoystickSDL.cc \
     src/ui/HILDockWidget.cc \
     src/ui/linechart/ChartPlot.cc \
     src/ui/linechart/IncrementalPlot.cc \

src/Joystick/Joystick.h

@@ -39,9 +39,9 @@ class Joystick : public QThread
     Q_OBJECT
     
 public:
-    Joystick(const QString& name, int axisCount, int buttonCount, int sdlIndex, MultiVehicleManager* multiVehicleManager);
+    Joystick(const QString& name, int axisCount, int buttonCount, MultiVehicleManager* multiVehicleManager);
     ~Joystick();
-    
+
     typedef struct {
         int     min;
         int     max;
@@ -136,7 +136,7 @@ signals:
     
     void buttonActionTriggered(int action);
     
-private:
+protected:
     void _saveSettings(void);
     void _loadSettings(void);
     float _adjustRange(int value, Calibration_t calibration);
@@ -144,11 +144,18 @@ private:
     bool _validAxis(int axis);
     bool _validButton(int button);
 
+private:
+    virtual bool open() = 0;
+    virtual void close() = 0;
+    virtual bool update() = 0;
+
+    virtual bool getButton(int i) = 0;
+    virtual int getAxis(int i) = 0;
+
     // Override from QThread
     virtual void run(void);
 
-private:
-    int     _sdlIndex;      ///< Index for SDL_JoystickOpen
+protected:
     
     bool    _exitThread;    ///< true: signal thread to exit
     

src/Joystick/JoystickAndroid.cc

+#include "JoystickAndroid.h"
+
+#include "QGCApplication.h"
+
+#include <QQmlEngine>
+
+int JoystickAndroid::_androidBtnListCount;
+int *JoystickAndroid::_androidBtnList;
+QMutex JoystickAndroid::m_mutex;
+
+JoystickAndroid::JoystickAndroid(const QString& name, int id, MultiVehicleManager* multiVehicleManager)
+    : Joystick(name,0,0,multiVehicleManager) //buttonCount and axisCount is computed below
+    , deviceId(id)
+{
+    int i;
+    
+    QAndroidJniEnvironment env;
+
+    QAndroidJniObject inputDevice = QAndroidJniObject::callStaticObjectMethod("android/view/InputDevice", "getDevice", "(I)Landroid/view/InputDevice;", id);
+
+    //get number of buttons
+    jintArray a = env->NewIntArray(_androidBtnListCount);
+    env->SetIntArrayRegion(a,0,_androidBtnListCount,_androidBtnList);
+
+    QAndroidJniObject btns = inputDevice.callObjectMethod("hasKeys", "([I)[Z", a);
+    jbooleanArray jSupportedButtons = btns.object<jbooleanArray>();
+    int btn_sz = env->GetArrayLength(jSupportedButtons);
+    jboolean* supportedButtons = env->GetBooleanArrayElements(jSupportedButtons, nullptr);
+    _buttonCount=0;
+    for (i=0;i<btn_sz;i++) 
+        if (supportedButtons[i]) _buttonCount++;
+
+    //create a mapping table (btnCode) that maps button number with button code
+    btnValue = new bool[_buttonCount];
+    btnCode = new int[_buttonCount];
+    int c = 0;
+    for (i=0;i<btn_sz;i++) 
+        if (supportedButtons[i]) {
+		btnValue[c] = false;
+        btnCode[c] = _androidBtnList[i];
+		c++;
+	}
+
+    env->ReleaseBooleanArrayElements(jSupportedButtons, supportedButtons, 0);
+
+    //get number of axis
+    QAndroidJniObject rangeListNative = inputDevice.callObjectMethod("getMotionRanges", "()Ljava/util/List;");
+    _axisCount = rangeListNative.callMethod<jint>("size");
+    axisValue = new int[_axisCount];
+    axisCode = new int[_axisCount];
+    for (i=0;i<_axisCount;i++) { 
+	QAndroidJniObject range = rangeListNative.callObjectMethod("get", "()Landroid/view/InputDevice/MotionRange;");
+	if (range.isValid())
+		axisCode[i] = range.callMethod<jint>("getAxis");
+	axisValue[i] = 0;
+    }
+
+    qDebug() << "joystick constructor:" << _name;
+
+    QtAndroidPrivate::registerGenericMotionEventListener(this);
+    QtAndroidPrivate::registerKeyEventListener(this);
+}
+
+JoystickAndroid::~JoystickAndroid() {
+    qDebug() << "joystick destructor" << _name;
+
+    delete btnCode;
+    delete axisCode;
+    delete btnValue;
+    delete axisValue;
+
+    QtAndroidPrivate::unregisterGenericMotionEventListener(this);
+    QtAndroidPrivate::unregisterKeyEventListener(this);
+}
+
+bool JoystickAndroid::handleKeyEvent(jobject event) {
+    QJNIObjectPrivate ev(event);
+    QMutexLocker lock(&m_mutex);
+    const int _deviceId = ev.callMethod<jint>("getDeviceId", "()I");
+    if (_deviceId!=deviceId) return false;
+ 
+    qDebug() << "handleKeyEvent!" << deviceId;
+    return true;
+}
+
+bool JoystickAndroid::handleGenericMotionEvent(jobject event) {
+    QJNIObjectPrivate ev(event);
+    QMutexLocker lock(&m_mutex);
+    const int _deviceId = ev.callMethod<jint>("getDeviceId", "()I");
+    if (_deviceId!=deviceId) return false;
+ 
+    qDebug() << "handleMotionEvent!" << deviceId;
+    return true;
+}
+
+QMap<QString, Joystick*> JoystickAndroid::discover(MultiVehicleManager* _multiVehicleManager) {
+    bool joystickFound = false;
+    static QMap<QString, Joystick*> ret;
+
+    _buttonList(); //it's enough to run it once, should be in a static constructor
+
+    QMutexLocker lock(&m_mutex);
+
+    QAndroidJniEnvironment env;
+    QAndroidJniObject o = QAndroidJniObject::callStaticObjectMethod<jintArray>("android/view/InputDevice", "getDeviceIds");
+    jintArray jarr = o.object<jintArray>();
+    size_t sz = env->GetArrayLength(jarr);
+    jint *buff = env->GetIntArrayElements(jarr, nullptr);
+
+    int SOURCE_GAMEPAD = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_GAMEPAD");
+    int SOURCE_JOYSTICK = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_JOYSTICK");
+
+    for (size_t i = 0; i < sz; ++i) {
+        QAndroidJniObject inputDevice = QAndroidJniObject::callStaticObjectMethod("android/view/InputDevice", "getDevice", "(I)Landroid/view/InputDevice;", buff[i]);
+        int sources = inputDevice.callMethod<jint>("getSources", "()I");
+        if (((sources & SOURCE_GAMEPAD) != SOURCE_GAMEPAD) //check if the input device is interesting to us
+                && ((sources & SOURCE_JOYSTICK) != SOURCE_JOYSTICK)) continue;
+
+        //get id and name
+        QString id = inputDevice.callObjectMethod("getDescriptor", "()Ljava/lang/String;").toString();
+        QString name = inputDevice.callObjectMethod("getName", "()Ljava/lang/String;").toString();
+
+
+	if (joystickFound) { //skipping {
+		qWarning() << "Skipping joystick:" << name;
+		continue;
+	}
+
+        qDebug() << "\t" << name << "id:" << buff[i];
+        ret[name] = new JoystickAndroid(name, buff[i], _multiVehicleManager);
+        joystickFound = true;
+    }
+
+    env->ReleaseIntArrayElements(jarr, buff, 0);
+
+
+    return ret;
+}
+
+bool JoystickAndroid::open(void) {
+    return true;
+}
+
+void JoystickAndroid::close(void) {
+}
+
+bool JoystickAndroid::update(void)
+{
+    return true;
+}
+
+bool JoystickAndroid::getButton(int i) {
+    return btnValue[ btnCode[i] ]; 
+}
+
+int JoystickAndroid::getAxis(int i) {
+    return axisValue[ axisCode[i] ]; 
+}
+
+
+//helper method
+void JoystickAndroid::_buttonList() {
+    //this gets list of all possible buttons - this is needed to check how many buttons our gamepad supports
+    //instead of the whole logic below we could have just a simple array of hardcoded int values as these 'should' not change
+
+    //int JoystickAndroid::_androidBtnListCount;
+    _androidBtnListCount = 31;
+    static int ret[31]; //there are 31 buttons in total accordingy to the API
+    int i;
+    //int *JoystickAndroid::
+    _androidBtnList = ret;
+
+    for (i=1;i<=16;i++) {
+        QString name = "KEYCODE_BUTTON_"+QString::number(i);
+        ret[i-1] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", name.toStdString().c_str());
+    }
+    i--;
+
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_A");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_B");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_C");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L1");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L2");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R1");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R2");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_MODE");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_SELECT");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_START");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBL");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBR");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_X");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Y");
+    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Z");
+
+    for (int j=0;j<_androidBtnListCount;j++)
+        qDebug() << "\tpossible button: "+QString::number(_androidBtnList[j]);
+
+}
+

src/Joystick/JoystickAndroid.h

+#ifndef JOYSTICKANDROID_H
+#define JOYSTICKANDROID_H
+
+#include "Joystick.h"
+#include "Vehicle.h"
+#include "MultiVehicleManager.h"
+
+#include <jni.h>
+#include <QtCore/private/qjni_p.h>
+#include <QtCore/private/qjnihelpers_p.h>
+#include <QtAndroidExtras/QtAndroidExtras>
+#include <QtAndroidExtras/QAndroidJniObject>
+
+
+class JoystickAndroid : public Joystick, public QtAndroidPrivate::GenericMotionEventListener, public QtAndroidPrivate::KeyEventListener
+{
+public:
+    JoystickAndroid(const QString& name, int id, MultiVehicleManager* multiVehicleManager);
+    ~JoystickAndroid();
+
+    static QMap<QString, Joystick*> discover(MultiVehicleManager* _multiVehicleManager); 
+
+private:
+    bool handleKeyEvent(jobject event);
+    bool handleGenericMotionEvent(jobject event);
+
+    virtual bool open();
+    virtual void close();
+    virtual bool update();
+
+    virtual bool getButton(int i);
+    virtual int getAxis(int i);
+
+    int *btnCode;
+    int *axisCode;
+    bool *btnValue;
+    int *axisValue;
+
+    static void _buttonList();
+    static int * _androidBtnList; //list of all possible android buttons
+    static int _androidBtnListCount;
+
+    static QMutex m_mutex;
+
+    int deviceId;
+};
+
+#endif // JOYSTICKANDROID_H

src/Joystick/JoystickManager.cc

@@ -27,12 +27,12 @@
 #include <QQmlEngine>
 
 #ifndef __mobile__
+    #include "JoystickSDL.h"
     #define __sdljoystick__
-    #ifdef Q_OS_MAC
-        #include <SDL.h>
-    #else
-        #include <SDL/SDL.h>
-    #endif
+#endif
+
+#ifdef __android__
+    #include "JoystickAndroid.h"
 #endif
 
 QGC_LOGGING_CATEGORY(JoystickManagerLog, "JoystickManagerLog")
@@ -45,7 +45,15 @@ JoystickManager::JoystickManager(QGCApplication* app)
     , _activeJoystick(NULL)
     , _multiVehicleManager(NULL)
 {
-    
+}
+
+JoystickManager::~JoystickManager() {
+    QMap<QString, Joystick*>::iterator i;
+    for (i = _name2JoystickMap.begin(); i != _name2JoystickMap.end(); ++i) {
+        qDebug() << "Releasing joystick:" << i.key();
+        delete i.value();
+    }
+    qDebug() << "Done";
 }
 
 void JoystickManager::setToolbox(QGCToolbox *toolbox)
@@ -57,82 +65,9 @@ void JoystickManager::setToolbox(QGCToolbox *toolbox)
     QQmlEngine::setObjectOwnership(this, QQmlEngine::CppOwnership);
 
 #ifdef __sdljoystick__
-    if (SDL_InitSubSystem(SDL_INIT_JOYSTICK | SDL_INIT_NOPARACHUTE) < 0) {
-        qWarning() << "Couldn't initialize SimpleDirectMediaLayer:" << SDL_GetError();
-        return;
-    }
-
-    // Load available joysticks
-
-    qCDebug(JoystickManagerLog) << "Available joysticks";
-
-    for (int i=0; i<SDL_NumJoysticks(); i++) {
-        QString name = SDL_JoystickName(i);
-
-        if (!_name2JoystickMap.contains(name)) {
-            int axisCount, buttonCount;
-
-            SDL_Joystick* sdlJoystick = SDL_JoystickOpen(i);
-            axisCount = SDL_JoystickNumAxes(sdlJoystick);
-            buttonCount = SDL_JoystickNumButtons(sdlJoystick);
-            SDL_JoystickClose(sdlJoystick);
-
-            qCDebug(JoystickManagerLog) << "\t" << name << "axes:" << axisCount << "buttons:" << buttonCount;
-            _name2JoystickMap[name] = new Joystick(name, axisCount, buttonCount, i, _multiVehicleManager);
-        } else {
-            qCDebug(JoystickManagerLog) << "\tSkipping duplicate" << name;
-        }
-    }
+    _name2JoystickMap = JoystickSDL::discover(_multiVehicleManager);
 #elif defined(__android__)
-    QMutexLocker lock(&m_mutex);
-
-    computePossibleButtons(); //this is just needed to get number of supported buttons 
-
-    QAndroidJniEnvironment env;
-    QAndroidJniObject o = QAndroidJniObject::callStaticObjectMethod<jintArray>("android/view/InputDevice", "getDeviceIds");
-    jintArray jarr = o.object<jintArray>();
-    size_t sz = env->GetArrayLength(jarr);
-    jint *buff = env->GetIntArrayElements(jarr, nullptr);
-
-    int SOURCE_GAMEPAD = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_GAMEPAD");
-    int SOURCE_JOYSTICK = QAndroidJniObject::getStaticField<jint>("android/view/InputDevice", "SOURCE_JOYSTICK");
-
-    for (size_t i = 0; i < sz; ++i) {
-        int axisCount, buttonCount;
-        QAndroidJniObject inputDevice = QAndroidJniObject::callStaticObjectMethod("android/view/InputDevice", "getDevice", "(I)Landroid/view/InputDevice;", buff[i]);
-        int sources = inputDevice.callMethod<jint>("getSources", "()I");
-        if (((sources & SOURCE_GAMEPAD) != SOURCE_GAMEPAD) //check if the input device is interesting to us
-                && ((sources & SOURCE_JOYSTICK) != SOURCE_JOYSTICK)) continue;
-
-	//get id and name
-        QString id = inputDevice.callObjectMethod("getDescriptor", "()Ljava/lang/String;").toString();
-        QString name = inputDevice.callObjectMethod("getName", "()Ljava/lang/String;").toString();
-
-	//get number of buttons
-	jintArray a = env->NewIntArray(31);
-	env->SetIntArrayRegion(a,0,31,_possibleButtons);
-
-        //QAndroidJniObject keyMap = inputDevice.callObjectMethod("getKeyCharacterMap", "()Landroid/view/KeyCharacterMap;");
-    	//QAndroidJniObject btns = keyMap.callStaticObjectMethod("android/view/KeyCharacterMap","deviceHasKeys", "([I)[Z", a);
-    	QAndroidJniObject btns = inputDevice.callObjectMethod("hasKeys", "([I)[Z", a);
-        jbooleanArray jSupportedButtons = btns.object<jbooleanArray>();
-        size_t btn_sz = env->GetArrayLength(jSupportedButtons);
-        jboolean* supportedButtons = env->GetBooleanArrayElements(jSupportedButtons, nullptr);
-        buttonCount=0;
-        for (size_t j=0;j<btn_sz;j++)
-            if (supportedButtons[j]) buttonCount++;
-
-        env->ReleaseBooleanArrayElements(jSupportedButtons, supportedButtons, 0);
-
-	//get number of axis
-        QAndroidJniObject rangeListNative = inputDevice.callObjectMethod("getMotionRanges", "()Ljava/util/List;");
-        axisCount = rangeListNative.callMethod<jint>("size");
-
-        qCDebug(JoystickManagerLog) << "\t" << name << "axes:" << axisCount << "buttons:" << buttonCount;
-    	_name2JoystickMap[name] = new Joystick(name, axisCount, buttonCount, buff[i], _multiVehicleManager);
-    }
-
-    env->ReleaseIntArrayElements(jarr, buff, 0);
+    _name2JoystickMap = JoystickAndroid::discover(_multiVehicleManager);
 #endif
 
     if (!_name2JoystickMap.count()) {
@@ -143,38 +78,6 @@ void JoystickManager::setToolbox(QGCToolbox *toolbox)
     _setActiveJoystickFromSettings();
 }
 
-void JoystickManager::computePossibleButtons() {
-    static int ret[31];
-    int i;
-
-    for (i=1;i<=16;i++) {
-        QString name = "KEYCODE_BUTTON_"+QString::number(i);
-        ret[i-1] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", name.toStdString().c_str());
-    }
-    i--;
-
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_A");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_B");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_C");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L1");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_L2");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R1");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_R2");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_MODE");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_SELECT");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_START");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBL");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_THUMBR");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_X");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Y");
-    ret[i++] = QAndroidJniObject::getStaticField<jint>("android/view/KeyEvent", "KEYCODE_BUTTON_Z");
-
-    for (int j=0;j<i;j++)
-        qCDebug(JoystickManagerLog) << "\tpossible button: "+ret[j];
-
-    _possibleButtons = ret;
-}
-
 void JoystickManager::_setActiveJoystickFromSettings(void)
 {
     QSettings settings;

src/Joystick/JoystickManager.h

@@ -31,14 +31,6 @@
 
 #include <QVariantList>
 
-#ifdef __android__
-    #include <jni.h>
-    #include <QtCore/private/qjni_p.h>
-    #include <QtCore/private/qjnihelpers_p.h>
-    #include <QtAndroidExtras/QtAndroidExtras>
-    #include <QtAndroidExtras/QAndroidJniObject>
-#endif
-
 Q_DECLARE_LOGGING_CATEGORY(JoystickManagerLog)
 
 class QGCApplicaiton;
@@ -49,6 +41,7 @@ class JoystickManager : public QGCTool
     
 public:
     JoystickManager(QGCApplication* app);
+    ~JoystickManager();
 
     /// List of available joysticks
     Q_PROPERTY(QVariantList joysticks READ joysticks CONSTANT)
@@ -86,12 +79,6 @@ private:
     
     static const char * _settingsGroup;
     static const char * _settingsKeyActiveJoystick;
-
-#ifdef __android__
-    void computePossibleButtons();
-    int * _possibleButtons;
-    QMutex m_mutex;
-#endif
 };
 
 #endif

src/Joystick/JoystickSDL.cc

+#include "JoystickSDL.h"
+
+#include "QGCApplication.h"
+
+#include <QQmlEngine>
+
+JoystickSDL::JoystickSDL(const QString& name, int axisCount, int buttonCount, int index, MultiVehicleManager* multiVehicleManager)
+    : Joystick(name,axisCount,buttonCount,multiVehicleManager)
+    , _index(index)
+{
+}
+
+QMap<QString, Joystick*> JoystickSDL::discover(MultiVehicleManager* _multiVehicleManager) {
+    static QMap<QString, Joystick*> ret;
+
+    if (SDL_InitSubSystem(SDL_INIT_JOYSTICK | SDL_INIT_NOPARACHUTE) < 0) {
+        qWarning() << "Couldn't initialize SimpleDirectMediaLayer:" << SDL_GetError();
+        return ret;
+    }
+
+    // Load available joysticks
+
+    qCDebug(JoystickLog) << "Available joysticks";
+
+    for (int i=0; i<SDL_NumJoysticks(); i++) {
+        QString name = SDL_JoystickName(i);
+
+        if (!ret.contains(name)) {
+            int axisCount, buttonCount;
+
+            SDL_Joystick* sdlJoystick = SDL_JoystickOpen(i);
+            axisCount = SDL_JoystickNumAxes(sdlJoystick);
+            buttonCount = SDL_JoystickNumButtons(sdlJoystick);
+            SDL_JoystickClose(sdlJoystick);
+
+            qCDebug(JoystickLog) << "\t" << name << "axes:" << axisCount << "buttons:" << buttonCount;
+            ret[name] = new JoystickSDL(name, axisCount, buttonCount, i, _multiVehicleManager);
+        } else {
+            qCDebug(JoystickLog) << "\tSkipping duplicate" << name;
+        }
+    }
+    return ret;
+}
+
+bool JoystickSDL::open(void) {
+    sdlJoystick = SDL_JoystickOpen(_index);
+
+    if (!sdlJoystick) {
+	qCWarning(JoystickLog) << "SDL_JoystickOpen failed:" << SDL_GetError();
+	return false;
+    }
+
+    return true;
+}
+
+void JoystickSDL::close(void) {
+    SDL_JoystickClose(sdlJoystick);
+}
+
+bool JoystickSDL::update(void)
+{
+    SDL_JoystickUpdate();
+    return true;
+}
+
+bool JoystickSDL::getButton(int i) {
+    return !!SDL_JoystickGetButton(sdlJoystick, i);
+}
+
+int JoystickSDL::getAxis(int i) {
+    return SDL_JoystickGetAxis(sdlJoystick, i);
+}
+

src/Joystick/joysticksdl.h

+#ifndef JOYSTICKSDL_H
+#define JOYSTICKSDL_H
+
+#include "Joystick.h"
+#include "Vehicle.h"
+#include "MultiVehicleManager.h"
+
+#ifdef Q_OS_MAC
+    #include <SDL.h>
+#else
+    #include <SDL/SDL.h>
+#endif
+
+
+class JoystickSDL : public Joystick
+{
+public:
+    JoystickSDL(const QString& name, int axisCount, int buttonCount, int index, MultiVehicleManager* multiVehicleManager);
+
+    static QMap<QString, Joystick*> discover(MultiVehicleManager* _multiVehicleManager); 
+
+private:
+    virtual bool open();
+    virtual void close();
+    virtual bool update();
+
+    virtual bool getButton(int i);
+    virtual int getAxis(int i);
+
+    SDL_Joystick *sdlJoystick;
+    int     _index;      ///< Index for SDL_JoystickOpen
+};
+
+#endif // JOYSTICKSDL_H