Added the iOS sensor implementation

src/sensor/SDL_sensor.c

@@ -36,6 +36,9 @@ static SDL_SensorDriver *SDL_sensor_drivers[] = {
 #ifdef SDL_SENSOR_ANDROID
     &SDL_ANDROID_SensorDriver,
 #endif
+#ifdef SDL_SENSOR_COREMOTION
+    &SDL_COREMOTION_SensorDriver,
+#endif
 #if defined(SDL_SENSOR_DUMMY) || defined(SDL_SENSOR_DISABLED)
     &SDL_DUMMY_SensorDriver
 #endif

src/sensor/SDL_syssensor.h

@@ -93,6 +93,7 @@ typedef struct _SDL_SensorDriver
 
 /* The available sensor drivers */
 extern SDL_SensorDriver SDL_ANDROID_SensorDriver;
+extern SDL_SensorDriver SDL_COREMOTION_SensorDriver;
 extern SDL_SensorDriver SDL_DUMMY_SensorDriver;
 
 /* vi: set ts=4 sw=4 expandtab: */

src/sensor/android/SDL_androidsensor.c

@@ -156,7 +156,7 @@ SDL_ANDROID_SensorOpen(SDL_Sensor *sensor, int device_index)
 }
     
 static void
-SDL_ANDROID_SensorUpdate(SDL_Sensor* sensor)
+SDL_ANDROID_SensorUpdate(SDL_Sensor *sensor)
 {
     int events;
     ASensorEvent event;
@@ -171,7 +171,7 @@ SDL_ANDROID_SensorUpdate(SDL_Sensor* sensor)
 }
 
 static void
-SDL_ANDROID_SensorClose(SDL_Sensor * sensor)
+SDL_ANDROID_SensorClose(SDL_Sensor *sensor)
 {
     if (sensor->hwdata) {
         ASensorEventQueue_disableSensor(sensor->hwdata->eventqueue, sensor->hwdata->asensor);

src/sensor/coremotion/SDL_coremotionsensor.h

@@ -0,0 +1,30 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_config.h"
+
+/* The private structure used to keep track of a sensor */
+struct sensor_hwdata
+{
+    float data[3];
+};
+
+
+/* vi: set ts=4 sw=4 expandtab: */

src/sensor/coremotion/SDL_coremotionsensor.m

@@ -0,0 +1,236 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_config.h"
+
+#ifdef SDL_SENSOR_COREMOTION
+
+/* This is the system specific header for the SDL sensor API */
+#include <CoreMotion/CoreMotion.h>
+
+#include "SDL_error.h"
+#include "SDL_sensor.h"
+#include "SDL_coremotionsensor.h"
+#include "../SDL_syssensor.h"
+#include "../SDL_sensor_c.h"
+
+#define STANDARD_GRAVITY    9.80665f
+
+typedef struct
+{
+    SDL_SensorType type;
+    SDL_SensorID instance_id;
+} SDL_CoreMotionSensor;
+
+static CMMotionManager *SDL_motion_manager;
+static SDL_CoreMotionSensor *SDL_sensors;
+static int SDL_sensors_count;
+
+static int
+SDL_COREMOTION_SensorInit(void)
+{
+    int i, sensors_count = 0;
+
+    if (!SDL_motion_manager) {
+        SDL_motion_manager = [[CMMotionManager alloc] init];
+    }
+
+    if (SDL_motion_manager.accelerometerAvailable) {
+        ++sensors_count;
+    }
+    if (SDL_motion_manager.gyroAvailable) {
+        ++sensors_count;
+    }
+
+    if (sensors_count > 0) {
+        SDL_sensors = (SDL_CoreMotionSensor *)SDL_calloc(sensors_count, sizeof(*SDL_sensors));
+        if (!SDL_sensors) {
+            return SDL_OutOfMemory();
+        }
+
+        i = 0;
+        if (SDL_motion_manager.accelerometerAvailable) {
+            SDL_sensors[i].type = SDL_SENSOR_ACCEL;
+            SDL_sensors[i].instance_id = SDL_GetNextSensorInstanceID();
+            ++i;
+        }
+        if (SDL_motion_manager.gyroAvailable) {
+            SDL_sensors[i].type = SDL_SENSOR_GYRO;
+            SDL_sensors[i].instance_id = SDL_GetNextSensorInstanceID();
+            ++i;
+        }
+        SDL_sensors_count = sensors_count;
+    }
+    return 0;
+}
+
+static int
+SDL_COREMOTION_SensorGetCount(void)
+{
+    return SDL_sensors_count;
+}
+
+static void
+SDL_COREMOTION_SensorDetect(void)
+{
+}
+
+static const char *
+SDL_COREMOTION_SensorGetDeviceName(int device_index)
+{
+    switch (SDL_sensors[device_index].type) {
+    case SDL_SENSOR_ACCEL:
+        return "Accelerometer";
+    case SDL_SENSOR_GYRO:
+        return "Gyro";
+    default:
+        return "Unknown";
+    }
+}
+
+static SDL_SensorType
+SDL_COREMOTION_SensorGetDeviceType(int device_index)
+{
+    return SDL_sensors[device_index].type;
+}
+
+static int
+SDL_COREMOTION_SensorGetDeviceNonPortableType(int device_index)
+{
+    return SDL_sensors[device_index].type;
+}
+
+static SDL_SensorID
+SDL_COREMOTION_SensorGetDeviceInstanceID(int device_index)
+{
+    return SDL_sensors[device_index].instance_id;
+}
+
+static int
+SDL_COREMOTION_SensorOpen(SDL_Sensor *sensor, int device_index)
+{
+    struct sensor_hwdata *hwdata;
+
+    hwdata = (struct sensor_hwdata *)SDL_calloc(1, sizeof(*hwdata));
+    if (hwdata == NULL) {
+        return SDL_OutOfMemory();
+    }
+    sensor->hwdata = hwdata;
+
+    switch (sensor->type)
+    {
+    case SDL_SENSOR_ACCEL:
+        [SDL_motion_manager startAccelerometerUpdates];
+        break;
+    case SDL_SENSOR_GYRO:
+        [SDL_motion_manager startGyroUpdates];
+        break;
+    default:
+        break;
+    }
+    return 0;
+}
+    
+static void
+SDL_COREMOTION_SensorUpdate(SDL_Sensor *sensor)
+{
+    switch (sensor->type)
+    {
+    case SDL_SENSOR_ACCEL:
+        {
+            CMAccelerometerData *accelerometerData = SDL_motion_manager.accelerometerData;
+            if (accelerometerData) {
+                CMAcceleration acceleration = accelerometerData.acceleration;
+                float data[3];
+                data[0] = acceleration.x * STANDARD_GRAVITY;
+                data[1] = acceleration.y * STANDARD_GRAVITY;
+                data[2] = acceleration.z * STANDARD_GRAVITY;
+                if (SDL_memcmp(data, sensor->hwdata->data, sizeof(data)) != 0) {
+                    SDL_PrivateSensorUpdate(sensor, data, SDL_arraysize(data));
+                    SDL_memcpy(sensor->hwdata->data, data, sizeof(data));
+                }
+            }
+        }
+        break;
+    case SDL_SENSOR_GYRO:
+        {
+            CMGyroData *gyroData = SDL_motion_manager.gyroData;
+            if (gyroData) {
+                CMRotationRate rotationRate = gyroData.rotationRate;
+                float data[3];
+                data[0] = rotationRate.x;
+                data[1] = rotationRate.y;
+                data[2] = rotationRate.z;
+                if (SDL_memcmp(data, sensor->hwdata->data, sizeof(data)) != 0) {
+                    SDL_PrivateSensorUpdate(sensor, data, SDL_arraysize(data));
+                    SDL_memcpy(sensor->hwdata->data, data, sizeof(data));
+                }
+            }
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+static void
+SDL_COREMOTION_SensorClose(SDL_Sensor *sensor)
+{
+    if (sensor->hwdata) {
+        switch (sensor->type)
+        {
+        case SDL_SENSOR_ACCEL:
+            [SDL_motion_manager stopAccelerometerUpdates];
+            break;
+        case SDL_SENSOR_GYRO:
+            [SDL_motion_manager stopGyroUpdates];
+            break;
+        default:
+            break;
+        }
+        SDL_free(sensor->hwdata);
+        sensor->hwdata = NULL;
+    }
+}
+
+static void
+SDL_COREMOTION_SensorQuit(void)
+{
+}
+
+SDL_SensorDriver SDL_COREMOTION_SensorDriver =
+{
+    SDL_COREMOTION_SensorInit,
+    SDL_COREMOTION_SensorGetCount,
+    SDL_COREMOTION_SensorDetect,
+    SDL_COREMOTION_SensorGetDeviceName,
+    SDL_COREMOTION_SensorGetDeviceType,
+    SDL_COREMOTION_SensorGetDeviceNonPortableType,
+    SDL_COREMOTION_SensorGetDeviceInstanceID,
+    SDL_COREMOTION_SensorOpen,
+    SDL_COREMOTION_SensorUpdate,
+    SDL_COREMOTION_SensorClose,
+    SDL_COREMOTION_SensorQuit,
+};
+
+#endif /* SDL_SENSOR_COREMOTION */
+
+/* vi: set ts=4 sw=4 expandtab: */

src/sensor/dummy/SDL_dummysensor.c

@@ -76,12 +76,12 @@ SDL_DUMMY_SensorOpen(SDL_Sensor *sensor, int device_index)
 }
     
 static void
-SDL_DUMMY_SensorUpdate(SDL_Sensor* sensor)
+SDL_DUMMY_SensorUpdate(SDL_Sensor *sensor)
 {
 }
 
 static void
-SDL_DUMMY_SensorClose(SDL_Sensor * sensor)
+SDL_DUMMY_SensorClose(SDL_Sensor *sensor)
 {
 }