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SDL_joystick.h File Reference
#include "SDL_stdinc.h"
#include "SDL_error.h"
#include "SDL_guid.h"
#include "begin_code.h"
#include "close_code.h"

Go to the source code of this file.

Data Structures

struct  SDL_VirtualJoystickDesc
 

Macros

#define SDL_IPHONE_MAX_GFORCE   5.0
 
#define SDL_VIRTUAL_JOYSTICK_DESC_VERSION   1
 The current version of the SDL_VirtualJoystickDesc structure.
 
#define SDL_JOYSTICK_AXIS_MAX   32767
 
#define SDL_JOYSTICK_AXIS_MIN   -32768
 

Typedefs

typedef struct _SDL_Joystick SDL_Joystick
 
typedef SDL_GUID SDL_JoystickGUID
 
typedef Sint32 SDL_JoystickID
 
typedef struct SDL_VirtualJoystickDesc SDL_VirtualJoystickDesc
 

Enumerations

enum  SDL_JoystickType {
  SDL_JOYSTICK_TYPE_UNKNOWN , SDL_JOYSTICK_TYPE_GAMECONTROLLER , SDL_JOYSTICK_TYPE_WHEEL , SDL_JOYSTICK_TYPE_ARCADE_STICK ,
  SDL_JOYSTICK_TYPE_FLIGHT_STICK , SDL_JOYSTICK_TYPE_DANCE_PAD , SDL_JOYSTICK_TYPE_GUITAR , SDL_JOYSTICK_TYPE_DRUM_KIT ,
  SDL_JOYSTICK_TYPE_ARCADE_PAD , SDL_JOYSTICK_TYPE_THROTTLE
}
 
enum  SDL_JoystickPowerLevel {
  SDL_JOYSTICK_POWER_UNKNOWN = -1 , SDL_JOYSTICK_POWER_EMPTY , SDL_JOYSTICK_POWER_LOW , SDL_JOYSTICK_POWER_MEDIUM ,
  SDL_JOYSTICK_POWER_FULL , SDL_JOYSTICK_POWER_WIRED , SDL_JOYSTICK_POWER_MAX
}
 

Functions

DECLSPEC void SDLCALL SDL_LockJoysticks (void)
 
DECLSPEC void SDLCALL SDL_UnlockJoysticks (void)
 
DECLSPEC int SDLCALL SDL_NumJoysticks (void)
 
DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex (int device_index)
 
DECLSPEC const char *SDLCALL SDL_JoystickPathForIndex (int device_index)
 
DECLSPEC int SDLCALL SDL_JoystickGetDevicePlayerIndex (int device_index)
 
DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID (int device_index)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceVendor (int device_index)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProduct (int device_index)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProductVersion (int device_index)
 
DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetDeviceType (int device_index)
 
DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickGetDeviceInstanceID (int device_index)
 
DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen (int device_index)
 
DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromInstanceID (SDL_JoystickID instance_id)
 
DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromPlayerIndex (int player_index)
 
DECLSPEC int SDLCALL SDL_JoystickAttachVirtual (SDL_JoystickType type, int naxes, int nbuttons, int nhats)
 
DECLSPEC int SDLCALL SDL_JoystickAttachVirtualEx (const SDL_VirtualJoystickDesc *desc)
 
DECLSPEC int SDLCALL SDL_JoystickDetachVirtual (int device_index)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickIsVirtual (int device_index)
 
DECLSPEC int SDLCALL SDL_JoystickSetVirtualAxis (SDL_Joystick *joystick, int axis, Sint16 value)
 
DECLSPEC int SDLCALL SDL_JoystickSetVirtualButton (SDL_Joystick *joystick, int button, Uint8 value)
 
DECLSPEC int SDLCALL SDL_JoystickSetVirtualHat (SDL_Joystick *joystick, int hat, Uint8 value)
 
DECLSPEC const char *SDLCALL SDL_JoystickName (SDL_Joystick *joystick)
 
DECLSPEC const char *SDLCALL SDL_JoystickPath (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickGetPlayerIndex (SDL_Joystick *joystick)
 
DECLSPEC void SDLCALL SDL_JoystickSetPlayerIndex (SDL_Joystick *joystick, int player_index)
 
DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID (SDL_Joystick *joystick)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetVendor (SDL_Joystick *joystick)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetProduct (SDL_Joystick *joystick)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetProductVersion (SDL_Joystick *joystick)
 
DECLSPEC Uint16 SDLCALL SDL_JoystickGetFirmwareVersion (SDL_Joystick *joystick)
 
DECLSPEC const char *SDLCALL SDL_JoystickGetSerial (SDL_Joystick *joystick)
 
DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetType (SDL_Joystick *joystick)
 
DECLSPEC void SDLCALL SDL_JoystickGetGUIDString (SDL_JoystickGUID guid, char *pszGUID, int cbGUID)
 
DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString (const char *pchGUID)
 
DECLSPEC void SDLCALL SDL_GetJoystickGUIDInfo (SDL_JoystickGUID guid, Uint16 *vendor, Uint16 *product, Uint16 *version, Uint16 *crc16)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached (SDL_Joystick *joystick)
 
DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickNumAxes (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickNumBalls (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickNumHats (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickNumButtons (SDL_Joystick *joystick)
 
DECLSPEC void SDLCALL SDL_JoystickUpdate (void)
 
DECLSPEC int SDLCALL SDL_JoystickEventState (int state)
 
DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis (SDL_Joystick *joystick, int axis)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAxisInitialState (SDL_Joystick *joystick, int axis, Sint16 *state)
 

Hat positions

#define SDL_HAT_CENTERED   0x00
 
#define SDL_HAT_UP   0x01
 
#define SDL_HAT_RIGHT   0x02
 
#define SDL_HAT_DOWN   0x04
 
#define SDL_HAT_LEFT   0x08
 
#define SDL_HAT_RIGHTUP   (SDL_HAT_RIGHT|SDL_HAT_UP)
 
#define SDL_HAT_RIGHTDOWN   (SDL_HAT_RIGHT|SDL_HAT_DOWN)
 
#define SDL_HAT_LEFTUP   (SDL_HAT_LEFT|SDL_HAT_UP)
 
#define SDL_HAT_LEFTDOWN   (SDL_HAT_LEFT|SDL_HAT_DOWN)
 
DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat (SDL_Joystick *joystick, int hat)
 
DECLSPEC int SDLCALL SDL_JoystickGetBall (SDL_Joystick *joystick, int ball, int *dx, int *dy)
 
DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton (SDL_Joystick *joystick, int button)
 
DECLSPEC int SDLCALL SDL_JoystickRumble (SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms)
 
DECLSPEC int SDLCALL SDL_JoystickRumbleTriggers (SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble, Uint32 duration_ms)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickHasLED (SDL_Joystick *joystick)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumble (SDL_Joystick *joystick)
 
DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumbleTriggers (SDL_Joystick *joystick)
 
DECLSPEC int SDLCALL SDL_JoystickSetLED (SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue)
 
DECLSPEC int SDLCALL SDL_JoystickSendEffect (SDL_Joystick *joystick, const void *data, int size)
 
DECLSPEC void SDLCALL SDL_JoystickClose (SDL_Joystick *joystick)
 
DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_JoystickCurrentPowerLevel (SDL_Joystick *joystick)
 

Detailed Description

Include file for SDL joystick event handling

The term "device_index" identifies currently plugged in joystick devices between 0 and SDL_NumJoysticks(), with the exact joystick behind a device_index changing as joysticks are plugged and unplugged.

The term "instance_id" is the current instantiation of a joystick device in the system, if the joystick is removed and then re-inserted then it will get a new instance_id, instance_id's are monotonically increasing identifiers of a joystick plugged in.

The term "player_index" is the number assigned to a player on a specific controller. For XInput controllers this returns the XInput user index. Many joysticks will not be able to supply this information.

The term JoystickGUID is a stable 128-bit identifier for a joystick device that does not change over time, it identifies class of the device (a X360 wired controller for example). This identifier is platform dependent.

In order to use these functions, SDL_Init() must have been called with the SDL_INIT_JOYSTICK flag. This causes SDL to scan the system for joysticks, and load appropriate drivers.

If you would like to receive joystick updates while the application is in the background, you should set the following hint before calling SDL_Init(): SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS

Typedef Documentation

◆ SDL_JoystickID

typedef Sint32 SDL_JoystickID

This is a unique ID for a joystick for the time it is connected to the system, and is never reused for the lifetime of the application. If the joystick is disconnected and reconnected, it will get a new ID.

The ID value starts at 0 and increments from there. The value -1 is an invalid ID.

◆ SDL_VirtualJoystickDesc

The structure that defines an extended virtual joystick description

The caller must zero the structure and then initialize the version with SDL_VIRTUAL_JOYSTICK_DESC_VERSION before passing it to SDL_JoystickAttachVirtualEx() All other elements of this structure are optional and can be left 0.

See also
SDL_JoystickAttachVirtualEx

Function Documentation

◆ SDL_GetJoystickGUIDInfo()

DECLSPEC void SDLCALL SDL_GetJoystickGUIDInfo ( SDL_JoystickGUID  guid,
Uint16 *  vendor,
Uint16 *  product,
Uint16 *  version,
Uint16 *  crc16 
)

Get the device information encoded in a SDL_JoystickGUID structure

Parameters
guidthe SDL_JoystickGUID you wish to get info about
vendorA pointer filled in with the device VID, or 0 if not available
productA pointer filled in with the device PID, or 0 if not available
versionA pointer filled in with the device version, or 0 if not available
crc16A pointer filled in with a CRC used to distinguish different products with the same VID/PID, or 0 if not available
Since
This function is available since SDL 2.26.0.
See also
SDL_JoystickGetDeviceGUID

◆ SDL_JoystickAttachVirtual()

DECLSPEC int SDLCALL SDL_JoystickAttachVirtual ( SDL_JoystickType  type,
int  naxes,
int  nbuttons,
int  nhats 
)

Attach a new virtual joystick.

Returns
the joystick's device index, or -1 if an error occurred.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickAttachVirtualEx()

DECLSPEC int SDLCALL SDL_JoystickAttachVirtualEx ( const SDL_VirtualJoystickDesc desc)

Attach a new virtual joystick with extended properties.

Returns
the joystick's device index, or -1 if an error occurred.
Since
This function is available since SDL 2.24.0.

◆ SDL_JoystickClose()

DECLSPEC void SDLCALL SDL_JoystickClose ( SDL_Joystick *  joystick)

Close a joystick previously opened with SDL_JoystickOpen().

Parameters
joystickThe joystick device to close
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickOpen

◆ SDL_JoystickCurrentPowerLevel()

DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_JoystickCurrentPowerLevel ( SDL_Joystick *  joystick)

Get the battery level of a joystick as SDL_JoystickPowerLevel.

Parameters
joystickthe SDL_Joystick to query
Returns
the current battery level as SDL_JoystickPowerLevel on success or SDL_JOYSTICK_POWER_UNKNOWN if it is unknown
Since
This function is available since SDL 2.0.4.

◆ SDL_JoystickDetachVirtual()

DECLSPEC int SDLCALL SDL_JoystickDetachVirtual ( int  device_index)

Detach a virtual joystick.

Parameters
device_indexa value previously returned from SDL_JoystickAttachVirtual()
Returns
0 on success, or -1 if an error occurred.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickEventState()

DECLSPEC int SDLCALL SDL_JoystickEventState ( int  state)

Enable/disable joystick event polling.

If joystick events are disabled, you must call SDL_JoystickUpdate() yourself and manually check the state of the joystick when you want joystick information.

It is recommended that you leave joystick event handling enabled.

WARNING: Calling this function may delete all events currently in SDL's event queue.

Parameters
statecan be one of SDL_QUERY, SDL_IGNORE, or SDL_ENABLE
Returns
1 if enabled, 0 if disabled, or a negative error code on failure; call SDL_GetError() for more information.

If state is SDL_QUERY then the current state is returned, otherwise the new processing state is returned.

Since
This function is available since SDL 2.0.0.
See also
SDL_GameControllerEventState

◆ SDL_JoystickFromInstanceID()

DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromInstanceID ( SDL_JoystickID  instance_id)

Get the SDL_Joystick associated with an instance id.

Parameters
instance_idthe instance id to get the SDL_Joystick for
Returns
an SDL_Joystick on success or NULL on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.4.

◆ SDL_JoystickFromPlayerIndex()

DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromPlayerIndex ( int  player_index)

Get the SDL_Joystick associated with a player index.

Parameters
player_indexthe player index to get the SDL_Joystick for
Returns
an SDL_Joystick on success or NULL on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.12.

◆ SDL_JoystickGetAttached()

DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached ( SDL_Joystick *  joystick)

Get the status of a specified joystick.

Parameters
joystickthe joystick to query
Returns
SDL_TRUE if the joystick has been opened, SDL_FALSE if it has not; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickClose
SDL_JoystickOpen

◆ SDL_JoystickGetAxis()

DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis ( SDL_Joystick *  joystick,
int  axis 
)

Get the current state of an axis control on a joystick.

SDL makes no promises about what part of the joystick any given axis refers to. Your game should have some sort of configuration UI to let users specify what each axis should be bound to. Alternately, SDL's higher-level Game Controller API makes a great effort to apply order to this lower-level interface, so you know that a specific axis is the "left thumb stick," etc.

The value returned by SDL_JoystickGetAxis() is a signed integer (-32768 to 32767) representing the current position of the axis. It may be necessary to impose certain tolerances on these values to account for jitter.

Parameters
joystickan SDL_Joystick structure containing joystick information
axisthe axis to query; the axis indices start at index 0
Returns
a 16-bit signed integer representing the current position of the axis or 0 on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickNumAxes

◆ SDL_JoystickGetAxisInitialState()

DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAxisInitialState ( SDL_Joystick *  joystick,
int  axis,
Sint16 *  state 
)

Get the initial state of an axis control on a joystick.

The state is a value ranging from -32768 to 32767.

The axis indices start at index 0.

Parameters
joystickan SDL_Joystick structure containing joystick information
axisthe axis to query; the axis indices start at index 0
stateUpon return, the initial value is supplied here.
Returns
SDL_TRUE if this axis has any initial value, or SDL_FALSE if not.
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetBall()

DECLSPEC int SDLCALL SDL_JoystickGetBall ( SDL_Joystick *  joystick,
int  ball,
int *  dx,
int *  dy 
)

Get the ball axis change since the last poll.

Trackballs can only return relative motion since the last call to SDL_JoystickGetBall(), these motion deltas are placed into dx and dy.

Most joysticks do not have trackballs.

Parameters
joystickthe SDL_Joystick to query
ballthe ball index to query; ball indices start at index 0
dxstores the difference in the x axis position since the last poll
dystores the difference in the y axis position since the last poll
Returns
0 on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickNumBalls

◆ SDL_JoystickGetButton()

DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton ( SDL_Joystick *  joystick,
int  button 
)

Get the current state of a button on a joystick.

Parameters
joystickan SDL_Joystick structure containing joystick information
buttonthe button index to get the state from; indices start at index 0
Returns
1 if the specified button is pressed, 0 otherwise.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickNumButtons

◆ SDL_JoystickGetDeviceGUID()

DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID ( int  device_index)

Get the implementation-dependent GUID for the joystick at a given device index.

This function can be called before any joysticks are opened.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the GUID of the selected joystick. If called on an invalid index, this function returns a zero GUID
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetGUID
SDL_JoystickGetGUIDString

◆ SDL_JoystickGetDeviceInstanceID()

DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickGetDeviceInstanceID ( int  device_index)

Get the instance ID of a joystick.

This can be called before any joysticks are opened. If the index is out of range, this function will return -1.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the instance id of the selected joystick. If called on an invalid index, this function returns zero
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetDevicePlayerIndex()

DECLSPEC int SDLCALL SDL_JoystickGetDevicePlayerIndex ( int  device_index)

Get the player index of a joystick, or -1 if it's not available This can be called before any joysticks are opened.

Since
This function is available since SDL 2.0.9.

◆ SDL_JoystickGetDeviceProduct()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProduct ( int  device_index)

Get the USB product ID of a joystick, if available.

This can be called before any joysticks are opened. If the product ID isn't available this function returns 0.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the USB product ID of the selected joystick. If called on an invalid index, this function returns zero
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetDeviceProductVersion()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProductVersion ( int  device_index)

Get the product version of a joystick, if available.

This can be called before any joysticks are opened. If the product version isn't available this function returns 0.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the product version of the selected joystick. If called on an invalid index, this function returns zero
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetDeviceType()

DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetDeviceType ( int  device_index)

Get the type of a joystick, if available.

This can be called before any joysticks are opened.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the SDL_JoystickType of the selected joystick. If called on an invalid index, this function returns SDL_JOYSTICK_TYPE_UNKNOWN
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetDeviceVendor()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceVendor ( int  device_index)

Get the USB vendor ID of a joystick, if available.

This can be called before any joysticks are opened. If the vendor ID isn't available this function returns 0.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system
Returns
the USB vendor ID of the selected joystick. If called on an invalid index, this function returns zero
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetFirmwareVersion()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetFirmwareVersion ( SDL_Joystick *  joystick)

Get the firmware version of an opened joystick, if available.

If the firmware version isn't available this function returns 0.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the firmware version of the selected joystick, or 0 if unavailable.
Since
This function is available since SDL 2.24.0.

◆ SDL_JoystickGetGUID()

DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID ( SDL_Joystick *  joystick)

Get the implementation-dependent GUID for the joystick.

This function requires an open joystick.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the GUID of the given joystick. If called on an invalid index, this function returns a zero GUID; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetDeviceGUID
SDL_JoystickGetGUIDString

◆ SDL_JoystickGetGUIDFromString()

DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString ( const char *  pchGUID)

Convert a GUID string into a SDL_JoystickGUID structure.

Performs no error checking. If this function is given a string containing an invalid GUID, the function will silently succeed, but the GUID generated will not be useful.

Parameters
pchGUIDstring containing an ASCII representation of a GUID
Returns
a SDL_JoystickGUID structure.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetGUIDString

◆ SDL_JoystickGetGUIDString()

DECLSPEC void SDLCALL SDL_JoystickGetGUIDString ( SDL_JoystickGUID  guid,
char *  pszGUID,
int  cbGUID 
)

Get an ASCII string representation for a given SDL_JoystickGUID.

You should supply at least 33 bytes for pszGUID.

Parameters
guidthe SDL_JoystickGUID you wish to convert to string
pszGUIDbuffer in which to write the ASCII string
cbGUIDthe size of pszGUID
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetDeviceGUID
SDL_JoystickGetGUID
SDL_JoystickGetGUIDFromString

◆ SDL_JoystickGetHat()

DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat ( SDL_Joystick *  joystick,
int  hat 
)

Get the current state of a POV hat on a joystick.

The returned value will be one of the following positions:

  • SDL_HAT_CENTERED
  • SDL_HAT_UP
  • SDL_HAT_RIGHT
  • SDL_HAT_DOWN
  • SDL_HAT_LEFT
  • SDL_HAT_RIGHTUP
  • SDL_HAT_RIGHTDOWN
  • SDL_HAT_LEFTUP
  • SDL_HAT_LEFTDOWN
Parameters
joystickan SDL_Joystick structure containing joystick information
hatthe hat index to get the state from; indices start at index 0
Returns
the current hat position.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickNumHats

◆ SDL_JoystickGetPlayerIndex()

DECLSPEC int SDLCALL SDL_JoystickGetPlayerIndex ( SDL_Joystick *  joystick)

Get the player index of an opened joystick.

For XInput controllers this returns the XInput user index. Many joysticks will not be able to supply this information.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the player index, or -1 if it's not available.
Since
This function is available since SDL 2.0.9.

◆ SDL_JoystickGetProduct()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetProduct ( SDL_Joystick *  joystick)

Get the USB product ID of an opened joystick, if available.

If the product ID isn't available this function returns 0.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the USB product ID of the selected joystick, or 0 if unavailable.
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetProductVersion()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetProductVersion ( SDL_Joystick *  joystick)

Get the product version of an opened joystick, if available.

If the product version isn't available this function returns 0.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the product version of the selected joystick, or 0 if unavailable.
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetSerial()

DECLSPEC const char *SDLCALL SDL_JoystickGetSerial ( SDL_Joystick *  joystick)

Get the serial number of an opened joystick, if available.

Returns the serial number of the joystick, or NULL if it is not available.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the serial number of the selected joystick, or NULL if unavailable.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickGetType()

DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetType ( SDL_Joystick *  joystick)

Get the type of an opened joystick.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the SDL_JoystickType of the selected joystick.
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickGetVendor()

DECLSPEC Uint16 SDLCALL SDL_JoystickGetVendor ( SDL_Joystick *  joystick)

Get the USB vendor ID of an opened joystick, if available.

If the vendor ID isn't available this function returns 0.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the USB vendor ID of the selected joystick, or 0 if unavailable.
Since
This function is available since SDL 2.0.6.

◆ SDL_JoystickHasLED()

DECLSPEC SDL_bool SDLCALL SDL_JoystickHasLED ( SDL_Joystick *  joystick)

Query whether a joystick has an LED.

An example of a joystick LED is the light on the back of a PlayStation 4's DualShock 4 controller.

Parameters
joystickThe joystick to query
Returns
SDL_TRUE if the joystick has a modifiable LED, SDL_FALSE otherwise.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickHasRumble()

DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumble ( SDL_Joystick *  joystick)

Query whether a joystick has rumble support.

Parameters
joystickThe joystick to query
Returns
SDL_TRUE if the joystick has rumble, SDL_FALSE otherwise.
Since
This function is available since SDL 2.0.18.
See also
SDL_JoystickRumble

◆ SDL_JoystickHasRumbleTriggers()

DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumbleTriggers ( SDL_Joystick *  joystick)

Query whether a joystick has rumble support on triggers.

Parameters
joystickThe joystick to query
Returns
SDL_TRUE if the joystick has trigger rumble, SDL_FALSE otherwise.
Since
This function is available since SDL 2.0.18.
See also
SDL_JoystickRumbleTriggers

◆ SDL_JoystickInstanceID()

DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID ( SDL_Joystick *  joystick)

Get the instance ID of an opened joystick.

Parameters
joystickan SDL_Joystick structure containing joystick information
Returns
the instance ID of the specified joystick on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickOpen

◆ SDL_JoystickIsVirtual()

DECLSPEC SDL_bool SDLCALL SDL_JoystickIsVirtual ( int  device_index)

Query whether or not the joystick at a given device index is virtual.

Parameters
device_indexa joystick device index.
Returns
SDL_TRUE if the joystick is virtual, SDL_FALSE otherwise.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickName()

DECLSPEC const char *SDLCALL SDL_JoystickName ( SDL_Joystick *  joystick)

Get the implementation dependent name of a joystick.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the name of the selected joystick. If no name can be found, this function returns NULL; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickNameForIndex
SDL_JoystickOpen

◆ SDL_JoystickNameForIndex()

DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex ( int  device_index)

Get the implementation dependent name of a joystick.

This can be called before any joysticks are opened.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system)
Returns
the name of the selected joystick. If no name can be found, this function returns NULL; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickName
SDL_JoystickOpen

◆ SDL_JoystickNumAxes()

DECLSPEC int SDLCALL SDL_JoystickNumAxes ( SDL_Joystick *  joystick)

Get the number of general axis controls on a joystick.

Often, the directional pad on a game controller will either look like 4 separate buttons or a POV hat, and not axes, but all of this is up to the device and platform.

Parameters
joystickan SDL_Joystick structure containing joystick information
Returns
the number of axis controls/number of axes on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetAxis
SDL_JoystickOpen

◆ SDL_JoystickNumBalls()

DECLSPEC int SDLCALL SDL_JoystickNumBalls ( SDL_Joystick *  joystick)

Get the number of trackballs on a joystick.

Joystick trackballs have only relative motion events associated with them and their state cannot be polled.

Most joysticks do not have trackballs.

Parameters
joystickan SDL_Joystick structure containing joystick information
Returns
the number of trackballs on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetBall

◆ SDL_JoystickNumButtons()

DECLSPEC int SDLCALL SDL_JoystickNumButtons ( SDL_Joystick *  joystick)

Get the number of buttons on a joystick.

Parameters
joystickan SDL_Joystick structure containing joystick information
Returns
the number of buttons on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetButton
SDL_JoystickOpen

◆ SDL_JoystickNumHats()

DECLSPEC int SDLCALL SDL_JoystickNumHats ( SDL_Joystick *  joystick)

Get the number of POV hats on a joystick.

Parameters
joystickan SDL_Joystick structure containing joystick information
Returns
the number of POV hats on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickGetHat
SDL_JoystickOpen

◆ SDL_JoystickOpen()

DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen ( int  device_index)

Open a joystick for use.

The device_index argument refers to the N'th joystick presently recognized by SDL on the system. It is NOT the same as the instance ID used to identify the joystick in future events. See SDL_JoystickInstanceID() for more details about instance IDs.

The joystick subsystem must be initialized before a joystick can be opened for use.

Parameters
device_indexthe index of the joystick to query
Returns
a joystick identifier or NULL if an error occurred; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickClose
SDL_JoystickInstanceID

◆ SDL_JoystickPath()

DECLSPEC const char *SDLCALL SDL_JoystickPath ( SDL_Joystick *  joystick)

Get the implementation dependent path of a joystick.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
Returns
the path of the selected joystick. If no path can be found, this function returns NULL; call SDL_GetError() for more information.
Since
This function is available since SDL 2.24.0.
See also
SDL_JoystickPathForIndex

◆ SDL_JoystickPathForIndex()

DECLSPEC const char *SDLCALL SDL_JoystickPathForIndex ( int  device_index)

Get the implementation dependent path of a joystick.

This can be called before any joysticks are opened.

Parameters
device_indexthe index of the joystick to query (the N'th joystick on the system)
Returns
the path of the selected joystick. If no path can be found, this function returns NULL; call SDL_GetError() for more information.
Since
This function is available since SDL 2.24.0.
See also
SDL_JoystickPath
SDL_JoystickOpen

◆ SDL_JoystickRumble()

DECLSPEC int SDLCALL SDL_JoystickRumble ( SDL_Joystick *  joystick,
Uint16  low_frequency_rumble,
Uint16  high_frequency_rumble,
Uint32  duration_ms 
)

Start a rumble effect.

Each call to this function cancels any previous rumble effect, and calling it with 0 intensity stops any rumbling.

Parameters
joystickThe joystick to vibrate
low_frequency_rumbleThe intensity of the low frequency (left) rumble motor, from 0 to 0xFFFF
high_frequency_rumbleThe intensity of the high frequency (right) rumble motor, from 0 to 0xFFFF
duration_msThe duration of the rumble effect, in milliseconds
Returns
0, or -1 if rumble isn't supported on this joystick
Since
This function is available since SDL 2.0.9.
See also
SDL_JoystickHasRumble

◆ SDL_JoystickRumbleTriggers()

DECLSPEC int SDLCALL SDL_JoystickRumbleTriggers ( SDL_Joystick *  joystick,
Uint16  left_rumble,
Uint16  right_rumble,
Uint32  duration_ms 
)

Start a rumble effect in the joystick's triggers

Each call to this function cancels any previous trigger rumble effect, and calling it with 0 intensity stops any rumbling.

Note that this is rumbling of the triggers and not the game controller as a whole. This is currently only supported on Xbox One controllers. If you want the (more common) whole-controller rumble, use SDL_JoystickRumble() instead.

Parameters
joystickThe joystick to vibrate
left_rumbleThe intensity of the left trigger rumble motor, from 0 to 0xFFFF
right_rumbleThe intensity of the right trigger rumble motor, from 0 to 0xFFFF
duration_msThe duration of the rumble effect, in milliseconds
Returns
0, or -1 if trigger rumble isn't supported on this joystick
Since
This function is available since SDL 2.0.14.
See also
SDL_JoystickHasRumbleTriggers

◆ SDL_JoystickSendEffect()

DECLSPEC int SDLCALL SDL_JoystickSendEffect ( SDL_Joystick *  joystick,
const void *  data,
int  size 
)

Send a joystick specific effect packet

Parameters
joystickThe joystick to affect
dataThe data to send to the joystick
sizeThe size of the data to send to the joystick
Returns
0, or -1 if this joystick or driver doesn't support effect packets
Since
This function is available since SDL 2.0.16.

◆ SDL_JoystickSetLED()

DECLSPEC int SDLCALL SDL_JoystickSetLED ( SDL_Joystick *  joystick,
Uint8  red,
Uint8  green,
Uint8  blue 
)

Update a joystick's LED color.

An example of a joystick LED is the light on the back of a PlayStation 4's DualShock 4 controller.

Parameters
joystickThe joystick to update
redThe intensity of the red LED
greenThe intensity of the green LED
blueThe intensity of the blue LED
Returns
0 on success, -1 if this joystick does not have a modifiable LED
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickSetPlayerIndex()

DECLSPEC void SDLCALL SDL_JoystickSetPlayerIndex ( SDL_Joystick *  joystick,
int  player_index 
)

Set the player index of an opened joystick.

Parameters
joystickthe SDL_Joystick obtained from SDL_JoystickOpen()
player_indexPlayer index to assign to this joystick, or -1 to clear the player index and turn off player LEDs.
Since
This function is available since SDL 2.0.12.

◆ SDL_JoystickSetVirtualAxis()

DECLSPEC int SDLCALL SDL_JoystickSetVirtualAxis ( SDL_Joystick *  joystick,
int  axis,
Sint16  value 
)

Set values on an opened, virtual-joystick's axis.

Please note that values set here will not be applied until the next call to SDL_JoystickUpdate, which can either be called directly, or can be called indirectly through various other SDL APIs, including, but not limited to the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, SDL_WaitEvent.

Note that when sending trigger axes, you should scale the value to the full range of Sint16. For example, a trigger at rest would have the value of SDL_JOYSTICK_AXIS_MIN.

Parameters
joystickthe virtual joystick on which to set state.
axisthe specific axis on the virtual joystick to set.
valuethe new value for the specified axis.
Returns
0 on success, -1 on error.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickSetVirtualButton()

DECLSPEC int SDLCALL SDL_JoystickSetVirtualButton ( SDL_Joystick *  joystick,
int  button,
Uint8  value 
)

Set values on an opened, virtual-joystick's button.

Please note that values set here will not be applied until the next call to SDL_JoystickUpdate, which can either be called directly, or can be called indirectly through various other SDL APIs, including, but not limited to the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, SDL_WaitEvent.

Parameters
joystickthe virtual joystick on which to set state.
buttonthe specific button on the virtual joystick to set.
valuethe new value for the specified button.
Returns
0 on success, -1 on error.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickSetVirtualHat()

DECLSPEC int SDLCALL SDL_JoystickSetVirtualHat ( SDL_Joystick *  joystick,
int  hat,
Uint8  value 
)

Set values on an opened, virtual-joystick's hat.

Please note that values set here will not be applied until the next call to SDL_JoystickUpdate, which can either be called directly, or can be called indirectly through various other SDL APIs, including, but not limited to the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, SDL_WaitEvent.

Parameters
joystickthe virtual joystick on which to set state.
hatthe specific hat on the virtual joystick to set.
valuethe new value for the specified hat.
Returns
0 on success, -1 on error.
Since
This function is available since SDL 2.0.14.

◆ SDL_JoystickUpdate()

DECLSPEC void SDLCALL SDL_JoystickUpdate ( void  )

Update the current state of the open joysticks.

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

Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickEventState

◆ SDL_LockJoysticks()

DECLSPEC void SDLCALL SDL_LockJoysticks ( void  )

Locking for multi-threaded access to the joystick API

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

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

As of SDL 2.26.0, you can take the joystick lock around reinitializing the joystick subsystem, to prevent other threads from seeing joysticks in an uninitialized state. However, all open joysticks will be closed and SDL functions called with them will fail.

Since
This function is available since SDL 2.0.7.

◆ SDL_NumJoysticks()

DECLSPEC int SDLCALL SDL_NumJoysticks ( void  )

Count the number of joysticks attached to the system.

Returns
the number of attached joysticks on success or a negative error code on failure; call SDL_GetError() for more information.
Since
This function is available since SDL 2.0.0.
See also
SDL_JoystickName
SDL_JoystickPath
SDL_JoystickOpen

◆ SDL_UnlockJoysticks()

DECLSPEC void SDLCALL SDL_UnlockJoysticks ( void  )

Unlocking for multi-threaded access to the joystick API

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

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

Since
This function is available since SDL 2.0.7.