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include/SDL_sensor.h
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include/SDL_sensor.h
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* # CategorySensor
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*
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* Include file for SDL sensor event handling
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*/
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#ifndef SDL_sensor_h_
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#define SDL_sensor_h_
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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* \brief SDL_sensor.h
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*
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* In order to use these functions, SDL_Init() must have been called
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* with the SDL_INIT_SENSOR flag. This causes SDL to scan the system
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* for sensors, and load appropriate drivers.
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*/
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struct _SDL_Sensor;
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typedef struct _SDL_Sensor SDL_Sensor;
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/**
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* This is a unique ID for a sensor for the time it is connected to the
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* system, and is never reused for the lifetime of the application.
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*
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* The ID value starts at 0 and increments from there. The value -1 is an
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* invalid ID.
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*/
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typedef Sint32 SDL_SensorID;
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/**
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* The different sensors defined by SDL.
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*
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* Additional sensors may be available, using platform dependent semantics.
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*
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* Here are the additional Android sensors:
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*
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* https://developer.android.com/reference/android/hardware/SensorEvent.html#values
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*
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* Accelerometer sensor notes:
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*
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* The accelerometer returns the current acceleration in SI meters per second
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* squared. This measurement includes the force of gravity, so a device at
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* rest will have an value of SDL_STANDARD_GRAVITY away from the center of the
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* earth, which is a positive Y value.
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*
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* - `values[0]`: Acceleration on the x axis
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* - `values[1]`: Acceleration on the y axis
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* - `values[2]`: Acceleration on the z axis
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*
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* For phones and tablets held in natural orientation and game controllers
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* held in front of you, the axes are defined as follows:
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*
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* - -X ... +X : left ... right
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* - -Y ... +Y : bottom ... top
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* - -Z ... +Z : farther ... closer
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*
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* The accelerometer axis data is not changed when the device is rotated.
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*
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* Gyroscope sensor notes:
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*
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* The gyroscope returns the current rate of rotation in radians per second.
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* The rotation is positive in the counter-clockwise direction. That is, an
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* observer looking from a positive location on one of the axes would see
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* positive rotation on that axis when it appeared to be rotating
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* counter-clockwise.
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*
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* - `values[0]`: Angular speed around the x axis (pitch)
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* - `values[1]`: Angular speed around the y axis (yaw)
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* - `values[2]`: Angular speed around the z axis (roll)
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*
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* For phones and tablets held in natural orientation and game controllers
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* held in front of you, the axes are defined as follows:
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*
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* - -X ... +X : left ... right
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* - -Y ... +Y : bottom ... top
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* - -Z ... +Z : farther ... closer
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*
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* The gyroscope axis data is not changed when the device is rotated.
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*
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* \sa SDL_GetDisplayOrientation
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*/
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typedef enum SDL_SensorType
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{
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SDL_SENSOR_INVALID = -1, /**< Returned for an invalid sensor */
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SDL_SENSOR_UNKNOWN, /**< Unknown sensor type */
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SDL_SENSOR_ACCEL, /**< Accelerometer */
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SDL_SENSOR_GYRO, /**< Gyroscope */
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SDL_SENSOR_ACCEL_L, /**< Accelerometer for left Joy-Con controller and Wii nunchuk */
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SDL_SENSOR_GYRO_L, /**< Gyroscope for left Joy-Con controller */
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SDL_SENSOR_ACCEL_R, /**< Accelerometer for right Joy-Con controller */
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SDL_SENSOR_GYRO_R /**< Gyroscope for right Joy-Con controller */
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} SDL_SensorType;
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/**
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* A constant to represent standard gravity for accelerometer sensors.
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*
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* The accelerometer returns the current acceleration in SI meters per second
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* squared. This measurement includes the force of gravity, so a device at
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* rest will have an value of SDL_STANDARD_GRAVITY away from the center of the
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* earth, which is a positive Y value.
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*/
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#define SDL_STANDARD_GRAVITY 9.80665f
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/* Function prototypes */
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/**
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* Locking for multi-threaded access to the sensor API
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*
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* If you are using the sensor API or handling events from multiple threads
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* you should use these locking functions to protect access to the sensors.
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*
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* In particular, you are guaranteed that the sensor list won't change, so the
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* API functions that take a sensor index will be valid, and sensor events
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* will not be delivered.
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*
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* \since This function is available since SDL 2.0.14.
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*/
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extern DECLSPEC void SDLCALL SDL_LockSensors(void);
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extern DECLSPEC void SDLCALL SDL_UnlockSensors(void);
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/**
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* Count the number of sensors attached to the system right now.
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*
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* \returns the number of sensors detected.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC int SDLCALL SDL_NumSensors(void);
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/**
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* Get the implementation dependent name of a sensor.
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*
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* \param device_index The sensor to obtain name from.
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* \returns the sensor name, or NULL if `device_index` is out of range.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC const char *SDLCALL SDL_SensorGetDeviceName(int device_index);
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/**
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* Get the type of a sensor.
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*
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* \param device_index The sensor to get the type from.
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* \returns the SDL_SensorType, or `SDL_SENSOR_INVALID` if `device_index` is
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* out of range.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetDeviceType(int device_index);
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/**
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* Get the platform dependent type of a sensor.
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*
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* \param device_index The sensor to check.
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* \returns the sensor platform dependent type, or -1 if `device_index` is out
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* of range.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetDeviceNonPortableType(int device_index);
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/**
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* Get the instance ID of a sensor.
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*
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* \param device_index The sensor to get instance id from.
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* \returns the sensor instance ID, or -1 if `device_index` is out of range.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetDeviceInstanceID(int device_index);
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/**
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* Open a sensor for use.
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*
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* \param device_index The sensor to open.
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* \returns an SDL_Sensor sensor object, or NULL if an error occurred.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorOpen(int device_index);
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/**
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* Return the SDL_Sensor associated with an instance id.
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*
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* \param instance_id The sensor from instance id.
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* \returns an SDL_Sensor object.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorFromInstanceID(SDL_SensorID instance_id);
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/**
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* Get the implementation dependent name of a sensor
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*
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* \param sensor The SDL_Sensor object.
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* \returns the sensor name, or NULL if `sensor` is NULL.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC const char *SDLCALL SDL_SensorGetName(SDL_Sensor *sensor);
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/**
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* Get the type of a sensor.
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*
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* \param sensor The SDL_Sensor object to inspect.
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* \returns the SDL_SensorType type, or `SDL_SENSOR_INVALID` if `sensor` is
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* NULL.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetType(SDL_Sensor *sensor);
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/**
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* Get the platform dependent type of a sensor.
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*
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* \param sensor The SDL_Sensor object to inspect.
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* \returns the sensor platform dependent type, or -1 if `sensor` is NULL.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetNonPortableType(SDL_Sensor *sensor);
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/**
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* Get the instance ID of a sensor.
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*
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* \param sensor The SDL_Sensor object to inspect.
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* \returns the sensor instance ID, or -1 if `sensor` is NULL.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetInstanceID(SDL_Sensor *sensor);
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/**
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* Get the current state of an opened sensor.
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*
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* The number of values and interpretation of the data is sensor dependent.
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*
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* \param sensor The SDL_Sensor object to query.
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* \param data A pointer filled with the current sensor state.
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* \param num_values The number of values to write to data.
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* \returns 0 or -1 if an error occurred.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetData(SDL_Sensor *sensor, float *data, int num_values);
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/**
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* Get the current state of an opened sensor with the timestamp of the last
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* update.
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*
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* The number of values and interpretation of the data is sensor dependent.
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*
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* \param sensor The SDL_Sensor object to query.
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* \param timestamp A pointer filled with the timestamp in microseconds of the
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* current sensor reading if available, or 0 if not.
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* \param data A pointer filled with the current sensor state.
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* \param num_values The number of values to write to data.
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* \returns 0 or -1 if an error occurred.
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*
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* \since This function is available since SDL 2.26.0.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetDataWithTimestamp(SDL_Sensor *sensor, Uint64 *timestamp, float *data, int num_values);
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/**
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* Close a sensor previously opened with SDL_SensorOpen().
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*
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* \param sensor The SDL_Sensor object to close.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC void SDLCALL SDL_SensorClose(SDL_Sensor *sensor);
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/**
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* Update the current state of the open sensors.
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*
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* This is called automatically by the event loop if sensor events are
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* enabled.
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*
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* This needs to be called from the thread that initialized the sensor
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* subsystem.
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*
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* \since This function is available since SDL 2.0.9.
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*/
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extern DECLSPEC void SDLCALL SDL_SensorUpdate(void);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* SDL_sensor_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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