SDL_sensor_c.h File Reference

#include "SDL_config.h"
#include "SDL_sensor.h"

Include dependency graph for SDL_sensor_c.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
SDL_SensorID	SDL_GetNextSensorInstanceID (void)
int	SDL_SensorInit (void)
void	SDL_SensorQuit (void)
int	SDL_PrivateSensorUpdate (SDL_Sensor *sensor, float *data, int num_values)

Function Documentation

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_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_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_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().