SDL_sensor.c File Reference

#include "../SDL_internal.h"
#include "SDL.h"
#include "SDL_atomic.h"
#include "SDL_events.h"
#include "SDL_syssensor.h"
#include "../events/SDL_events_c.h"

Include dependency graph for SDL_sensor.c:

Go to the source code of this file.

Functions
void	SDL_LockSensors (void)
void	SDL_UnlockSensors (void)
int	SDL_SensorInit (void)
int	SDL_NumSensors (void)
	Count the number of sensors attached to the system right now. More...
SDL_SensorID	SDL_GetNextSensorInstanceID ()
static SDL_bool	SDL_GetDriverAndSensorIndex (int device_index, SDL_SensorDriver **driver, int *driver_index)
const char *	SDL_SensorGetDeviceName (int device_index)
	Get the implementation dependent name of a sensor. More...
SDL_SensorType	SDL_SensorGetDeviceType (int device_index)
	Get the type of a sensor. More...
int	SDL_SensorGetDeviceNonPortableType (int device_index)
	Get the platform dependent type of a sensor. More...
SDL_SensorID	SDL_SensorGetDeviceInstanceID (int device_index)
	Get the instance ID of a sensor. More...
SDL_Sensor *	SDL_SensorOpen (int device_index)
	Open a sensor for use. More...
SDL_Sensor *	SDL_SensorFromInstanceID (SDL_SensorID instance_id)
static int	SDL_PrivateSensorValid (SDL_Sensor *sensor)
const char *	SDL_SensorGetName (SDL_Sensor *sensor)
	Get the implementation dependent name of a sensor. More...
SDL_SensorType	SDL_SensorGetType (SDL_Sensor *sensor)
	Get the type of a sensor. More...
int	SDL_SensorGetNonPortableType (SDL_Sensor *sensor)
	Get the platform dependent type of a sensor. More...
SDL_SensorID	SDL_SensorGetInstanceID (SDL_Sensor *sensor)
	Get the instance ID of a sensor. More...
int	SDL_SensorGetData (SDL_Sensor *sensor, float *data, int num_values)
void	SDL_SensorClose (SDL_Sensor *sensor)
void	SDL_SensorQuit (void)
int	SDL_PrivateSensorUpdate (SDL_Sensor *sensor, float *data, int num_values)
void	SDL_SensorUpdate (void)

Variables
static SDL_SensorDriver *	SDL_sensor_drivers []
static SDL_Sensor *	SDL_sensors = NULL
static SDL_bool	SDL_updating_sensor = SDL_FALSE
static SDL_mutex *	SDL_sensor_lock = NULL
static SDL_atomic_t	SDL_next_sensor_instance_id

Function Documentation

SDL_GetDriverAndSensorIndex()

static SDL_bool SDL_GetDriverAndSensorIndex ( int  device_index, SDL_SensorDriver **  driver, int *  driver_index  )

static

Definition at line 124 of file SDL_sensor.c.

{
    int i, num_sensors, total_sensors = 0;
 
    if (device_index >= 0) {
        for (i = 0; i < SDL_arraysize(SDL_sensor_drivers); ++i) {
            num_sensors = SDL_sensor_drivers[i]->GetCount();
            if (device_index < num_sensors) {
                *driver = SDL_sensor_drivers[i];
                *driver_index = device_index;
                return SDL_TRUE;
            }
            device_index -= num_sensors;
            total_sensors += num_sensors;
        }
    }
 
    SDL_SetError("There are %d sensors available", total_sensors);
    return SDL_FALSE;
}

References SDL_SensorDriver::GetCount, i, SDL_arraysize, SDL_FALSE, SDL_sensor_drivers, SDL_SetError, and SDL_TRUE.

Referenced by SDL_SensorGetDeviceInstanceID(), SDL_SensorGetDeviceName(), SDL_SensorGetDeviceNonPortableType(), SDL_SensorGetDeviceType(), and SDL_SensorOpen().

SDL_GetNextSensorInstanceID()

SDL_SensorID SDL_GetNextSensorInstanceID

(

void

)

Definition at line 114 of file SDL_sensor.c.

{
    return SDL_AtomicIncRef(&SDL_next_sensor_instance_id);
}

References SDL_AtomicIncRef, and SDL_next_sensor_instance_id.

SDL_LockSensors()

void SDL_LockSensors

(

void

)

Gyroscope sensor

The gyroscope returns the current rate of rotation in radians per second. The rotation is positive in the counter-clockwise direction. That is, an observer looking from a positive location on one of the axes would see positive rotation on that axis when it appeared to be rotating counter-clockwise.

values[0]: Angular speed around the x axis (pitch) values[1]: Angular speed around the y axis (yaw) values[2]: Angular speed around the z axis (roll)

For phones held in portrait mode and game controllers held in front of you, the axes are defined as follows: -X ... +X : left ... right -Y ... +Y : bottom ... top -Z ... +Z : farther ... closer

The axis data is not changed when the phone or controller is rotated.

See also

SDL_GetDisplayOrientation() Locking for multi-threaded access to the sensor hidapi API

If you are using the sensor API or handling events from multiple threads you should use these locking functions to protect access to the sensors.

In particular, you are guaranteed that the sensor list won't change, so the API functions that take a sensor index will be valid, and sensor events will not be delivered.

Definition at line 54 of file SDL_sensor.c.

{
    if (SDL_sensor_lock) {
        SDL_LockMutex(SDL_sensor_lock);
    }
}

References SDL_LockMutex, and SDL_sensor_lock.

Referenced by SDL_NumSensors(), SDL_SensorClose(), SDL_SensorFromInstanceID(), SDL_SensorGetDeviceInstanceID(), SDL_SensorGetDeviceName(), SDL_SensorGetDeviceNonPortableType(), SDL_SensorGetDeviceType(), SDL_SensorOpen(), SDL_SensorQuit(), and SDL_SensorUpdate().

SDL_NumSensors()

int SDL_NumSensors

(

void

)

Count the number of sensors attached to the system right now.

Definition at line 99 of file SDL_sensor.c.

{
    int i, total_sensors = 0;
    SDL_LockSensors();
    for (i = 0; i < SDL_arraysize(SDL_sensor_drivers); ++i) {
        total_sensors += SDL_sensor_drivers[i]->GetCount();
    }
    SDL_UnlockSensors();
    return total_sensors;
}

References SDL_SensorDriver::GetCount, i, SDL_arraysize, SDL_LockSensors(), SDL_sensor_drivers, and SDL_UnlockSensors().

SDL_PrivateSensorUpdate()

int SDL_PrivateSensorUpdate	(	SDL_Sensor *	sensor,
		float *	data,
		int	num_values
	)

Definition at line 478 of file SDL_sensor.c.

{
    int posted;
 
    /* Allow duplicate events, for things like steps and heartbeats */
 
    /* Update internal sensor state */
    num_values = SDL_min(num_values, SDL_arraysize(sensor->data));
    SDL_memcpy(sensor->data, data, num_values*sizeof(*data));
 
    /* Post the event, if desired */
    posted = 0;
#if !SDL_EVENTS_DISABLED
    if (SDL_GetEventState(SDL_SENSORUPDATE) == SDL_ENABLE) {
        SDL_Event event;
        event.type = SDL_SENSORUPDATE;
        event.sensor.which = sensor->instance_id;
        num_values = SDL_min(num_values, SDL_arraysize(event.sensor.data));
        SDL_memset(event.sensor.data, 0, sizeof(event.sensor.data));
        SDL_memcpy(event.sensor.data, data, num_values*sizeof(*data));
        posted = SDL_PushEvent(&event) == 1;
    }
#endif /* !SDL_EVENTS_DISABLED */
    return posted;
}

References SDL_arraysize, SDL_ENABLE, SDL_GetEventState, SDL_memcpy, SDL_memset, SDL_min, SDL_PushEvent, and SDL_SENSORUPDATE.

SDL_PrivateSensorValid()

static int SDL_PrivateSensorValid ( SDL_Sensor *  sensor )

static

Definition at line 307 of file SDL_sensor.c.

{
    int valid;
 
    if (sensor == NULL) {
        SDL_SetError("Sensor hasn't been opened yet");
        valid = 0;
    } else {
        valid = 1;
    }
 
    return valid;
}

References NULL, and SDL_SetError.

Referenced by SDL_SensorClose(), SDL_SensorGetData(), SDL_SensorGetInstanceID(), SDL_SensorGetName(), SDL_SensorGetNonPortableType(), and SDL_SensorGetType().

SDL_SensorClose()

void SDL_SensorClose

(

SDL_Sensor *

sensor

)

Close a sensor previously opened with SDL_SensorOpen()

Definition at line 392 of file SDL_sensor.c.

{
    SDL_Sensor *sensorlist;
    SDL_Sensor *sensorlistprev;
 
    if (!SDL_PrivateSensorValid(sensor)) {
        return;
    }
 
    SDL_LockSensors();
 
    /* First decrement ref count */
    if (--sensor->ref_count > 0) {
        SDL_UnlockSensors();
        return;
    }
 
    if (SDL_updating_sensor) {
        SDL_UnlockSensors();
        return;
    }
 
    sensor->driver->Close(sensor);
    sensor->hwdata = NULL;
 
    sensorlist = SDL_sensors;
    sensorlistprev = NULL;
    while (sensorlist) {
        if (sensor == sensorlist) {
            if (sensorlistprev) {
                /* unlink this entry */
                sensorlistprev->next = sensorlist->next;
            } else {
                SDL_sensors = sensor->next;
            }
            break;
        }
        sensorlistprev = sensorlist;
        sensorlist = sensorlist->next;
    }
 
    SDL_free(sensor->name);
 
    /* Free the data associated with this sensor */
    SDL_free(sensor);
 
    SDL_UnlockSensors();
}

References NULL, SDL_free, SDL_LockSensors(), SDL_PrivateSensorValid(), SDL_sensors, SDL_UnlockSensors(), and SDL_updating_sensor.

Referenced by SDL_SensorQuit(), and SDL_SensorUpdate().

SDL_SensorFromInstanceID()

SDL_Sensor* SDL_SensorFromInstanceID

(

SDL_SensorID

instance_id

)

Return the SDL_Sensor associated with an instance id.

Definition at line 289 of file SDL_sensor.c.

{
    SDL_Sensor *sensor;
 
    SDL_LockSensors();
    for (sensor = SDL_sensors; sensor; sensor = sensor->next) {
        if (sensor->instance_id == instance_id) {
            break;
        }
    }
    SDL_UnlockSensors();
    return sensor;
}

References SDL_LockSensors(), SDL_sensors, and SDL_UnlockSensors().

SDL_SensorGetData()

int SDL_SensorGetData	(	SDL_Sensor *	sensor,
		float *	data,
		int	num_values
	)

Get the current state of an opened sensor.

The number of values and interpretation of the data is sensor dependent.

Parameters

sensor	The sensor to query
data	A pointer filled with the current sensor state
num_values	The number of values to write to data

Returns

0 or -1 if an error occurred.

Definition at line 377 of file SDL_sensor.c.

{
    if (!SDL_PrivateSensorValid(sensor)) {
        return -1;
    }
 
    num_values = SDL_min(num_values, SDL_arraysize(sensor->data));
    SDL_memcpy(data, sensor->data, num_values*sizeof(*data));
    return 0;
}

References SDL_arraysize, SDL_memcpy, SDL_min, and SDL_PrivateSensorValid().

SDL_SensorGetDeviceInstanceID()

SDL_SensorID SDL_SensorGetDeviceInstanceID

(

int

device_index

)

Get the instance ID of a sensor.

This can be called before any sensors are opened.

Returns

The sensor instance ID, or -1 if device_index is out of range.

Definition at line 195 of file SDL_sensor.c.

{
    SDL_SensorDriver *driver;
    SDL_SensorID instance_id = -1;
 
    SDL_LockSensors();
    if (SDL_GetDriverAndSensorIndex(device_index, &driver, &device_index)) {
        instance_id = driver->GetDeviceInstanceID(device_index);
    }
    SDL_UnlockSensors();
 
    return instance_id;
}

References SDL_SensorDriver::GetDeviceInstanceID, SDL_GetDriverAndSensorIndex(), SDL_LockSensors(), and SDL_UnlockSensors().

SDL_SensorGetDeviceName()

const char* SDL_SensorGetDeviceName

(

int

device_index

)

Get the implementation dependent name of a sensor.

This can be called before any sensors are opened.

Returns

The sensor name, or NULL if device_index is out of range.

Definition at line 149 of file SDL_sensor.c.

{
    SDL_SensorDriver *driver;
    const char *name = NULL;
 
    SDL_LockSensors();
    if (SDL_GetDriverAndSensorIndex(device_index, &driver, &device_index)) {
        name = driver->GetDeviceName(device_index);
    }
    SDL_UnlockSensors();
 
    /* FIXME: Really we should reference count this name so it doesn't go away after unlock */
    return name;
}

References SDL_SensorDriver::GetDeviceName, NULL, SDL_GetDriverAndSensorIndex(), SDL_LockSensors(), and SDL_UnlockSensors().

SDL_SensorGetDeviceNonPortableType()

int SDL_SensorGetDeviceNonPortableType

(

int

device_index

)

Get the platform dependent type of a sensor.

This can be called before any sensors are opened.

Returns

The sensor platform dependent type, or -1 if device_index is out of range.

Definition at line 180 of file SDL_sensor.c.

{
    SDL_SensorDriver *driver;
    int type = -1;
 
    SDL_LockSensors();
    if (SDL_GetDriverAndSensorIndex(device_index, &driver, &device_index)) {
        type = driver->GetDeviceNonPortableType(device_index);
    }
    SDL_UnlockSensors();
 
    return type;
}

References SDL_SensorDriver::GetDeviceNonPortableType, SDL_GetDriverAndSensorIndex(), SDL_LockSensors(), and SDL_UnlockSensors().

SDL_SensorGetDeviceType()

SDL_SensorType SDL_SensorGetDeviceType

(

int

device_index

)

Get the type of a sensor.

This can be called before any sensors are opened.

Returns

The sensor type, or SDL_SENSOR_INVALID if device_index is out of range.

Definition at line 165 of file SDL_sensor.c.

{
    SDL_SensorDriver *driver;
    SDL_SensorType type = SDL_SENSOR_INVALID;
 
    SDL_LockSensors();
    if (SDL_GetDriverAndSensorIndex(device_index, &driver, &device_index)) {
        type = driver->GetDeviceType(device_index);
    }
    SDL_UnlockSensors();
 
    return type;
}

References SDL_SensorDriver::GetDeviceType, SDL_GetDriverAndSensorIndex(), SDL_LockSensors(), SDL_SENSOR_INVALID, and SDL_UnlockSensors().

SDL_SensorGetInstanceID()

SDL_SensorID SDL_SensorGetInstanceID

(

SDL_Sensor *

sensor

)

Get the instance ID of a sensor.

This can be called before any sensors are opened.

Returns

The sensor instance ID, or -1 if the sensor is NULL.

Definition at line 364 of file SDL_sensor.c.

{
    if (!SDL_PrivateSensorValid(sensor)) {
        return -1;
    }
 
    return sensor->instance_id;
}

References SDL_PrivateSensorValid().

SDL_SensorGetName()

const char* SDL_SensorGetName

(

SDL_Sensor *

sensor

)

Get the implementation dependent name of a sensor.

Returns

The sensor name, or NULL if the sensor is NULL.

Definition at line 325 of file SDL_sensor.c.

{
    if (!SDL_PrivateSensorValid(sensor)) {
        return NULL;
    }
 
    return sensor->name;
}

References NULL, and SDL_PrivateSensorValid().

SDL_SensorGetNonPortableType()

int SDL_SensorGetNonPortableType

(

SDL_Sensor *

sensor

)

Get the platform dependent type of a sensor.

This can be called before any sensors are opened.

Returns

The sensor platform dependent type, or -1 if the sensor is NULL.

Definition at line 351 of file SDL_sensor.c.

{
    if (!SDL_PrivateSensorValid(sensor)) {
        return -1;
    }
 
    return sensor->non_portable_type;
}

References SDL_PrivateSensorValid().

SDL_SensorGetType()

SDL_SensorType SDL_SensorGetType

(

SDL_Sensor *

sensor

)

Get the type of a sensor.

This can be called before any sensors are opened.

Returns

The sensor type, or SDL_SENSOR_INVALID if the sensor is NULL.

Definition at line 338 of file SDL_sensor.c.

{
    if (!SDL_PrivateSensorValid(sensor)) {
        return SDL_SENSOR_INVALID;
    }
 
    return sensor->type;
}

References SDL_PrivateSensorValid(), and SDL_SENSOR_INVALID.

SDL_SensorInit()

int SDL_SensorInit

(

void

)

Definition at line 71 of file SDL_sensor.c.

{
    int i, status;
 
    /* Create the sensor list lock */
    if (!SDL_sensor_lock) {
        SDL_sensor_lock = SDL_CreateMutex();
    }
 
#if !SDL_EVENTS_DISABLED
    if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0) {
        return -1;
    }
#endif /* !SDL_EVENTS_DISABLED */
 
    status = -1;
    for (i = 0; i < SDL_arraysize(SDL_sensor_drivers); ++i) {
        if (SDL_sensor_drivers[i]->Init() >= 0) {
            status = 0;
        }
    }
    return status;
}

References i, SDL_arraysize, SDL_CreateMutex, SDL_INIT_EVENTS, SDL_InitSubSystem, SDL_sensor_drivers, and SDL_sensor_lock.

Referenced by SDL_InitSubSystem().

SDL_SensorOpen()

SDL_Sensor* SDL_SensorOpen

(

int

device_index

)

Open a sensor for use.

The index passed as an argument refers to the N'th sensor on the system.

Returns

A sensor identifier, or NULL if an error occurred.

Definition at line 217 of file SDL_sensor.c.

{
    SDL_SensorDriver *driver;
    SDL_SensorID instance_id;
    SDL_Sensor *sensor;
    SDL_Sensor *sensorlist;
    const char *sensorname = NULL;
 
    SDL_LockSensors();
 
    if (!SDL_GetDriverAndSensorIndex(device_index, &driver, &device_index)) {
        SDL_UnlockSensors();
        return NULL;
    }
 
    sensorlist = SDL_sensors;
    /* If the sensor is already open, return it
     * it is important that we have a single sensor * for each instance id
     */
    instance_id = driver->GetDeviceInstanceID(device_index);
    while (sensorlist) {
        if (instance_id == sensorlist->instance_id) {
                sensor = sensorlist;
                ++sensor->ref_count;
                SDL_UnlockSensors();
                return sensor;
        }
        sensorlist = sensorlist->next;
    }
 
    /* Create and initialize the sensor */
    sensor = (SDL_Sensor *) SDL_calloc(sizeof(*sensor), 1);
    if (sensor == NULL) {
        SDL_OutOfMemory();
        SDL_UnlockSensors();
        return NULL;
    }
    sensor->driver = driver;
    sensor->instance_id = instance_id;
    sensor->type = driver->GetDeviceType(device_index);
    sensor->non_portable_type = driver->GetDeviceNonPortableType(device_index);
 
    if (driver->Open(sensor, device_index) < 0) {
        SDL_free(sensor);
        SDL_UnlockSensors();
        return NULL;
    }
 
    sensorname = driver->GetDeviceName(device_index);
    if (sensorname) {
        sensor->name = SDL_strdup(sensorname);
    } else {
        sensor->name = NULL;
    }
 
    /* Add sensor to list */
    ++sensor->ref_count;
    /* Link the sensor in the list */
    sensor->next = SDL_sensors;
    SDL_sensors = sensor;
 
    SDL_UnlockSensors();
 
    driver->Update(sensor);
 
    return sensor;
}

References SDL_SensorDriver::GetDeviceInstanceID, SDL_SensorDriver::GetDeviceName, SDL_SensorDriver::GetDeviceNonPortableType, SDL_SensorDriver::GetDeviceType, NULL, SDL_SensorDriver::Open, SDL_calloc, SDL_free, SDL_GetDriverAndSensorIndex(), SDL_LockSensors(), SDL_OutOfMemory, SDL_sensors, SDL_strdup, SDL_UnlockSensors(), and SDL_SensorDriver::Update.

SDL_SensorQuit()

void SDL_SensorQuit

(

void

)

Definition at line 442 of file SDL_sensor.c.

{
    int i;
 
    /* Make sure we're not getting called in the middle of updating sensors */
    SDL_assert(!SDL_updating_sensor);
 
    SDL_LockSensors();
 
    /* Stop the event polling */
    while (SDL_sensors) {
        SDL_sensors->ref_count = 1;
        SDL_SensorClose(SDL_sensors);
    }
 
    /* Quit the sensor setup */
    for (i = 0; i < SDL_arraysize(SDL_sensor_drivers); ++i) {
       SDL_sensor_drivers[i]->Quit();
    }
 
    SDL_UnlockSensors();
 
#if !SDL_EVENTS_DISABLED
    SDL_QuitSubSystem(SDL_INIT_EVENTS);
#endif
 
    if (SDL_sensor_lock) {
        SDL_DestroyMutex(SDL_sensor_lock);
        SDL_sensor_lock = NULL;
    }
}

References i, NULL, SDL_SensorDriver::Quit, SDL_arraysize, SDL_assert, SDL_DestroyMutex, SDL_INIT_EVENTS, SDL_LockSensors(), SDL_QuitSubSystem, SDL_sensor_drivers, SDL_sensor_lock, SDL_SensorClose(), SDL_sensors, SDL_UnlockSensors(), and SDL_updating_sensor.

Referenced by SDL_QuitSubSystem().

SDL_SensorUpdate()

void SDL_SensorUpdate

(

void

)

Update the current state of the open sensors.

This is called automatically by the event loop if sensor events are enabled.

This needs to be called from the thread that initialized the sensor subsystem.

Definition at line 505 of file SDL_sensor.c.

{
    int i;
    SDL_Sensor *sensor, *next;
 
    if (!SDL_WasInit(SDL_INIT_SENSOR)) {
        return;
    }
 
    SDL_LockSensors();
 
    if (SDL_updating_sensor) {
        /* The sensors are already being updated */
        SDL_UnlockSensors();
        return;
    }
 
    SDL_updating_sensor = SDL_TRUE;
 
    /* Make sure the list is unlocked while dispatching events to prevent application deadlocks */
    SDL_UnlockSensors();
 
    for (sensor = SDL_sensors; sensor; sensor = sensor->next) {
        sensor->driver->Update(sensor);
    }
 
    SDL_LockSensors();
 
    SDL_updating_sensor = SDL_FALSE;
 
    /* If any sensors were closed while updating, free them here */
    for (sensor = SDL_sensors; sensor; sensor = next) {
        next = sensor->next;
        if (sensor->ref_count <= 0) {
            SDL_SensorClose(sensor);
        }
    }
 
    /* this needs to happen AFTER walking the sensor list above, so that any
       dangling hardware data from removed devices can be free'd
     */
    for (i = 0; i < SDL_arraysize(SDL_sensor_drivers); ++i) {
        SDL_sensor_drivers[i]->Detect();
    }
 
    SDL_UnlockSensors();
}

References SDL_SensorDriver::Detect, i, SDL_arraysize, SDL_FALSE, SDL_INIT_SENSOR, SDL_LockSensors(), SDL_sensor_drivers, SDL_SensorClose(), SDL_sensors, SDL_TRUE, SDL_UnlockSensors(), SDL_updating_sensor, and SDL_WasInit.

SDL_UnlockSensors()

void SDL_UnlockSensors

(

void

)

Definition at line 62 of file SDL_sensor.c.

{
    if (SDL_sensor_lock) {
        SDL_UnlockMutex(SDL_sensor_lock);
    }
}

References SDL_sensor_lock, and SDL_UnlockMutex.

Referenced by SDL_NumSensors(), SDL_SensorClose(), SDL_SensorFromInstanceID(), SDL_SensorGetDeviceInstanceID(), SDL_SensorGetDeviceName(), SDL_SensorGetDeviceNonPortableType(), SDL_SensorGetDeviceType(), SDL_SensorOpen(), SDL_SensorQuit(), and SDL_SensorUpdate().

Variable Documentation

SDL_next_sensor_instance_id

SDL_atomic_t SDL_next_sensor_instance_id

static

Definition at line 51 of file SDL_sensor.c.

Referenced by SDL_GetNextSensorInstanceID().

SDL_sensor_drivers

SDL_SensorDriver* SDL_sensor_drivers[]

static

Initial value:

= {
 
 
 
 
 
 
 
 
 
 
    &SDL_DUMMY_SensorDriver
 
}

Definition at line 34 of file SDL_sensor.c.

Referenced by SDL_GetDriverAndSensorIndex(), SDL_NumSensors(), SDL_SensorInit(), SDL_SensorQuit(), and SDL_SensorUpdate().

SDL_sensor_lock

SDL_mutex* SDL_sensor_lock = NULL

static

Definition at line 50 of file SDL_sensor.c.

Referenced by SDL_LockSensors(), SDL_SensorInit(), SDL_SensorQuit(), and SDL_UnlockSensors().

SDL_sensors

SDL_Sensor* SDL_sensors = NULL

static

Definition at line 48 of file SDL_sensor.c.

Referenced by SDL_SensorClose(), SDL_SensorFromInstanceID(), SDL_SensorOpen(), SDL_SensorQuit(), and SDL_SensorUpdate().

SDL_updating_sensor

SDL_bool SDL_updating_sensor = SDL_FALSE

static

Definition at line 49 of file SDL_sensor.c.

Referenced by SDL_SensorClose(), SDL_SensorQuit(), and SDL_SensorUpdate().