[Android] Added the joystick implementation

src/SFML/Main/MainAndroid.cpp

@@ -67,13 +67,9 @@ static void initializeMain(ActivityStates* states)
     ALooper* looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
     states->looper = looper;
 
-    // Prepare the sensor event queue
-    states->sensorEventQueue = ASensorManager_createEventQueue(states->sensorManager, states->looper, 2, NULL, (void*)&sf::priv::processSensorEvents);
-
     // Get the default configuration
     states->config = AConfiguration_new();
     AConfiguration_fromAssetManager(states->config, states->activity->assetManager);
-
 }
 
 static void terminateMain(ActivityStates* states)
@@ -277,23 +273,9 @@ static void onWindowFocusChanged(ANativeActivity* activity, int focused)
     // Retrieve our activity states from the activity instance
     sf::priv::ActivityStates* states = sf::priv::retrieveStates(activity);
 
-    if (focused)
+    // Disable or enable sensors according the window focused state
-    {
+    if (states->enableSensors && states->disableSensors)
-        // We start monitoring the accelerometer with 60 events per second
+        focused ? states->enableSensors() : states->disableSensors();
-        if (states->accelerometerSensor != NULL)
-        {
-            ASensorEventQueue_enableSensor(states->sensorEventQueue, states->accelerometerSensor);
-            ASensorEventQueue_setEventRate(states->sensorEventQueue, states->accelerometerSensor, (1000L/60)*1000);
-        }
-    }
-    else
-    {
-        // We stop monitoring the accelerometer (it avoids consuming battery)
-        if (states->accelerometerSensor != NULL)
-        {
-            ASensorEventQueue_disableSensor(states->sensorEventQueue, states->accelerometerSensor);
-        }
-    }
 }
 
 static void onContentRectChanged(ANativeActivity* activity, const ARect* rect)
@@ -345,10 +327,6 @@ void ANativeActivity_onCreate(ANativeActivity* activity, void* savedState, size_
     states->inputQueue = NULL;
     states->config     = NULL;
 
-    states->sensorManager = ASensorManager_getInstance();
-    states->accelerometerSensor = ASensorManager_getDefaultSensor(states->sensorManager, ASENSOR_TYPE_ACCELEROMETER);
-    states->sensorEventQueue = NULL;
-
     states->display = eglCheck(eglGetDisplay(EGL_DEFAULT_DISPLAY));
 
     // As the input queue will be created before the SFML window, we need to use

src/SFML/System/Android/Activity.hpp

@@ -51,10 +51,6 @@ struct ActivityStates
     AInputQueue*    inputQueue;
     AConfiguration* config;
 
-    ASensorManager* sensorManager;
-    const ASensor* accelerometerSensor;
-    ASensorEventQueue* sensorEventQueue;
-
     EGLDisplay display;
     EglContext* context;
 
@@ -66,6 +62,9 @@ struct ActivityStates
     std::vector<Event> pendingEvents;
     int (*processEvent)(int fd, int events, void* data);
 
+    void (*enableSensors)();
+    void (*disableSensors)();
+
     std::map<int, Vector2i> touchEvents;
 
     bool mainOver;

src/SFML/Window/Android/JoystickImpl.cpp

@@ -26,8 +26,101 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Window/JoystickImpl.hpp>
+#include <SFML/System/Android/Activity.hpp>
+#include <SFML/System/Lock.hpp>
+#include <SFML/System/Vector3.hpp>
+#include <android/looper.h>
+#include <android/sensor.h>
 
 
+namespace
+{
+    enum
+    {
+        Accelerometer,
+        Gyroscope,
+        Magnetometer,
+        UserAcceleration,
+        AbsoluteOrientation,
+        Count
+    };
+
+    static const int32_t updateInterval = (1000L/60)*1000;
+
+    ALooper*           looper;
+    ASensorManager*    sensorManager;
+    ASensorEventQueue* sensorEventQueue;
+
+    struct
+    {
+        const ASensor* device;
+        sf::Vector3f   data;
+    } sensors[Count];
+
+    bool areSensorsEnabled;
+
+    int processSensorEvents(int fd, int events, void* data)
+    {
+        ASensorEvent event;
+
+        while (ASensorEventQueue_getEvents(sensorEventQueue, &event, 1) > 0)
+        {
+            // Cache the latest data
+            switch (event.sensor)
+            {
+                case ASENSOR_TYPE_ACCELEROMETER:
+                    sensors[Accelerometer].data.x = event.acceleration.x;
+                    sensors[Accelerometer].data.y = event.acceleration.y;
+                    sensors[Accelerometer].data.z = event.acceleration.z;
+                    break;
+
+                case ASENSOR_TYPE_GYROSCOPE:
+                    sensors[Gyroscope].data.x = event.vector.x;
+                    sensors[Gyroscope].data.y = event.vector.y;
+                    sensors[Gyroscope].data.z = event.vector.z;
+                    break;
+
+                case ASENSOR_TYPE_MAGNETIC_FIELD:
+                    sensors[Magnetometer].data.x = event.magnetic.x;
+                    sensors[Magnetometer].data.y = event.magnetic.y;
+                    sensors[Magnetometer].data.z = event.magnetic.z;
+                    break;
+             }
+        }
+
+        return 1;
+    }
+
+    void enableSensors()
+    {
+        // (Re)start monitoring sensors with 60 events per second
+        for (unsigned int i = 0; i < Count; ++i)
+        {
+            if (sensors[i].device != NULL)
+            {
+                ASensorEventQueue_enableSensor(sensorEventQueue, sensors[i].device);
+                ASensorEventQueue_setEventRate(sensorEventQueue, sensors[i].device, updateInterval);
+            }
+        }
+
+        areSensorsEnabled = true;
+    }
+
+    void disableSensors()
+    {
+        // Stop monitoring sensors (it avoids consuming battery)
+        for (unsigned int i = 0; i < Count; ++i)
+        {
+            if (sensors[i].device != NULL)
+            {
+                ASensorEventQueue_disableSensor(sensorEventQueue, sensors[i].device);
+            }
+        }
+
+        areSensorsEnabled = false;
+    }
+}
+
 namespace sf
 {
 namespace priv
@@ -35,25 +128,80 @@ namespace priv
 ////////////////////////////////////////////////////////////
 void JoystickImpl::initialize()
 {
+    // Register callbacks to pause sensors when the device is in standby mode
+    ActivityStates* states = getActivity(NULL);
+
+    {
+        Lock lock(states->mutex);
+
+        states->enableSensors = enableSensors;
+        states->disableSensors = disableSensors;
+    }
+
+    // Get the unique sensor manager
+    sensorManager = ASensorManager_getInstance();
+
+    // Prepare available sensors
+    sensors[Accelerometer].device = ASensorManager_getDefaultSensor(sensorManager,
+        ASENSOR_TYPE_ACCELEROMETER);
+    sensors[Gyroscope].device = ASensorManager_getDefaultSensor(sensorManager,
+        ASENSOR_TYPE_GYROSCOPE);
+    sensors[Magnetometer].device = ASensorManager_getDefaultSensor(sensorManager,
+        ASENSOR_TYPE_MAGNETIC_FIELD);
+
+    // User acceleration and absolute orientation sensors are unavailable on Android
+    // (at least, unavailable from the android C API)
+    sensors[UserAcceleration].device = NULL;
+    sensors[AbsoluteOrientation].device = NULL;
+
+    // Get the looper associated with this thread
+    looper = ALooper_forThread();
+
+    // Create the sensor events queue and attach it to the looper
+    sensorEventQueue = ASensorManager_createEventQueue(sensorManager, looper,
+        1, &processSensorEvents, NULL);
+
+    // Set the event rate (not to consume too much battery)
+    ASensorEventQueue_setEventRate(sensorEventQueue, sensors[Accelerometer].device, updateInterval);
+    ASensorEventQueue_setEventRate(sensorEventQueue, sensors[Gyroscope].device, updateInterval);
+    ASensorEventQueue_setEventRate(sensorEventQueue, sensors[Magnetometer].device, updateInterval);
+
+    // Start monitoring sensors
+    enableSensors();
 }
 
 
+
 ////////////////////////////////////////////////////////////
 void JoystickImpl::cleanup()
 {
+    // Stop monitoring sensors
+    disableSensors();
+
+    // Detach the sensor events queue from the looper and destroy it
+    ASensorManager_destroyEventQueue(sensorManager, sensorEventQueue);
 }
 
 
 ////////////////////////////////////////////////////////////
 bool JoystickImpl::isConnected(unsigned int index)
 {
-    return false;
+    // If sensors aren't paused and the requested sensor available
+    return (areSensorsEnabled && sensors[index].device);
 }
 
 
 ////////////////////////////////////////////////////////////
 bool JoystickImpl::open(unsigned int index)
 {
+    // Save the index if sensor is available
+    if(sensors[index].device)
+    {
+        m_index = index;
+
+        return true;
+    }
+
     return false;
 }
 
@@ -61,18 +209,41 @@ bool JoystickImpl::open(unsigned int index)
 ////////////////////////////////////////////////////////////
 void JoystickImpl::close()
 {
+    // Nothing to do
 }
 
 
 ////////////////////////////////////////////////////////////
 JoystickCaps JoystickImpl::getCapabilities() const
 {
+    JoystickCaps caps;
+
+    // All the connected joysticks have (X, Y, Z) axes
+    caps.axes[Joystick::X] = true;
+    caps.axes[Joystick::Y] = true;
+    caps.axes[Joystick::Z] = true;
+
+    return caps;
 }
 
 
 ////////////////////////////////////////////////////////////
-JoystickState JoystickImpl::JoystickImpl::update()
+JoystickState JoystickImpl::update()
 {
+    JoystickState state;
+
+    // Poll latest sensor events
+    ALooper_pollAll(0, NULL, NULL, NULL);
+
+    // Always connected
+    state.connected = sensors[m_index].device ? true : false;
+
+    // Use our cache
+    state.axes[Joystick::X] = sensors[m_index].data.x;
+    state.axes[Joystick::Y] = sensors[m_index].data.y;
+    state.axes[Joystick::Z] = sensors[m_index].data.z;
+
+    return state;
 }
 
 } // namespace priv