SDL_joystick.h File Reference

#include "SDL_stdinc.h"
#include "SDL_error.h"
#include "begin_code.h"
#include "close_code.h"

Include dependency graph for SDL_joystick.h:

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

Go to the source code of this file.

Data Structures
struct	SDL_JoystickGUID

Macros
#define	SDL_IPHONE_MAX_GFORCE   5.0
#define	SDL_JOYSTICK_AXIS_MAX   32767
#define	SDL_JOYSTICK_AXIS_MIN   -32768

Typedefs
typedef Sint32	SDL_JoystickID

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
void	SDL_LockJoysticks (void)
void	SDL_UnlockJoysticks (void)
int	SDL_NumJoysticks (void)
const char *	SDL_JoystickNameForIndex (int device_index)
int	SDL_JoystickGetDevicePlayerIndex (int device_index)
SDL_JoystickGUID	SDL_JoystickGetDeviceGUID (int device_index)
Uint16	SDL_JoystickGetDeviceVendor (int device_index)
Uint16	SDL_JoystickGetDeviceProduct (int device_index)
Uint16	SDL_JoystickGetDeviceProductVersion (int device_index)
SDL_JoystickType	SDL_JoystickGetDeviceType (int device_index)
SDL_JoystickID	SDL_JoystickGetDeviceInstanceID (int device_index)
SDL_Joystick *	SDL_JoystickOpen (int device_index)
SDL_Joystick *	SDL_JoystickFromInstanceID (SDL_JoystickID instance_id)
SDL_Joystick *	SDL_JoystickFromPlayerIndex (int player_index)
int	SDL_JoystickAttachVirtual (SDL_JoystickType type, int naxes, int nbuttons, int nhats)
int	SDL_JoystickDetachVirtual (int device_index)
SDL_bool	SDL_JoystickIsVirtual (int device_index)
int	SDL_JoystickSetVirtualAxis (SDL_Joystick *joystick, int axis, Sint16 value)
int	SDL_JoystickSetVirtualButton (SDL_Joystick *joystick, int button, Uint8 value)
int	SDL_JoystickSetVirtualHat (SDL_Joystick *joystick, int hat, Uint8 value)
const char *	SDL_JoystickName (SDL_Joystick *joystick)
int	SDL_JoystickGetPlayerIndex (SDL_Joystick *joystick)
void	SDL_JoystickSetPlayerIndex (SDL_Joystick *joystick, int player_index)
SDL_JoystickGUID	SDL_JoystickGetGUID (SDL_Joystick *joystick)
Uint16	SDL_JoystickGetVendor (SDL_Joystick *joystick)
Uint16	SDL_JoystickGetProduct (SDL_Joystick *joystick)
Uint16	SDL_JoystickGetProductVersion (SDL_Joystick *joystick)
const char *	SDL_JoystickGetSerial (SDL_Joystick *joystick)
SDL_JoystickType	SDL_JoystickGetType (SDL_Joystick *joystick)
void	SDL_JoystickGetGUIDString (SDL_JoystickGUID guid, char *pszGUID, int cbGUID)
SDL_JoystickGUID	SDL_JoystickGetGUIDFromString (const char *pchGUID)
SDL_bool	SDL_JoystickGetAttached (SDL_Joystick *joystick)
SDL_JoystickID	SDL_JoystickInstanceID (SDL_Joystick *joystick)
int	SDL_JoystickNumAxes (SDL_Joystick *joystick)
int	SDL_JoystickNumBalls (SDL_Joystick *joystick)
int	SDL_JoystickNumHats (SDL_Joystick *joystick)
int	SDL_JoystickNumButtons (SDL_Joystick *joystick)
void	SDL_JoystickUpdate (void)
int	SDL_JoystickEventState (int state)
Sint16	SDL_JoystickGetAxis (SDL_Joystick *joystick, int axis)
SDL_bool	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)
Uint8	SDL_JoystickGetHat (SDL_Joystick *joystick, int hat)
int	SDL_JoystickGetBall (SDL_Joystick *joystick, int ball, int *dx, int *dy)
Uint8	SDL_JoystickGetButton (SDL_Joystick *joystick, int button)
int	SDL_JoystickRumble (SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms)
int	SDL_JoystickRumbleTriggers (SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble, Uint32 duration_ms)
SDL_bool	SDL_JoystickHasLED (SDL_Joystick *joystick)
int	SDL_JoystickSetLED (SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue)
void	SDL_JoystickClose (SDL_Joystick *joystick)
SDL_JoystickPowerLevel	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 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

Definition in file SDL_joystick.h.

Macro Definition Documentation

SDL_HAT_CENTERED

#define SDL_HAT_CENTERED   0x00

Definition at line 386 of file SDL_joystick.h.

SDL_HAT_DOWN

#define SDL_HAT_DOWN   0x04

Definition at line 389 of file SDL_joystick.h.

SDL_HAT_LEFT

#define SDL_HAT_LEFT   0x08

Definition at line 390 of file SDL_joystick.h.

SDL_HAT_LEFTDOWN

#define SDL_HAT_LEFTDOWN   (SDL_HAT_LEFT|SDL_HAT_DOWN)

Definition at line 394 of file SDL_joystick.h.

SDL_HAT_LEFTUP

#define SDL_HAT_LEFTUP   (SDL_HAT_LEFT|SDL_HAT_UP)

Definition at line 393 of file SDL_joystick.h.

SDL_HAT_RIGHT

#define SDL_HAT_RIGHT   0x02

Definition at line 388 of file SDL_joystick.h.

SDL_HAT_RIGHTDOWN

#define SDL_HAT_RIGHTDOWN   (SDL_HAT_RIGHT|SDL_HAT_DOWN)

Definition at line 392 of file SDL_joystick.h.

SDL_HAT_RIGHTUP

#define SDL_HAT_RIGHTUP   (SDL_HAT_RIGHT|SDL_HAT_UP)

Definition at line 391 of file SDL_joystick.h.

SDL_HAT_UP

#define SDL_HAT_UP   0x01

Definition at line 387 of file SDL_joystick.h.

SDL_IPHONE_MAX_GFORCE

#define SDL_IPHONE_MAX_GFORCE   5.0

Definition at line 111 of file SDL_joystick.h.

SDL_JOYSTICK_AXIS_MAX

#define SDL_JOYSTICK_AXIS_MAX   32767

Definition at line 358 of file SDL_joystick.h.

SDL_JOYSTICK_AXIS_MIN

#define SDL_JOYSTICK_AXIS_MIN   -32768

Definition at line 359 of file SDL_joystick.h.

Typedef Documentation

SDL_JoystickID

SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 SDL_AssertionHandler void SDL_SpinLock SDL_atomic_t int int return SDL_atomic_t return void void void return void return int return SDL_AudioSpec SDL_AudioSpec return int int return return int SDL_RWops int SDL_AudioSpec Uint8 Uint32 return SDL_AudioCVT SDL_AudioFormat Uint8 int SDL_AudioFormat Uint8 int return Uint8 const Uint8 Uint32 int const char return return return return return return return return Uint32 return Uint32 SDL_Event return SDL_Event int return SDL_EventFilter void SDL_EventFilter void SDL_EventFilter void int return const char const char return SDL_JoystickGUID return int return int return SDL_GameController return int return const char return SDL_GameController SDL_GameControllerAxis return const char return SDL_GameController SDL_GameControllerButton return SDL_GameController SDL_RWops return SDL_TouchID SDL_RWops return int return int return return SDL_Joystick return SDL_Haptic SDL_Haptic return SDL_Haptic return SDL_Haptic SDL_HapticEffect return SDL_Haptic int Uint32 return SDL_Haptic int SDL_Haptic int return SDL_Haptic return SDL_Haptic return SDL_Haptic return SDL_Haptic return const char const char return const char SDL_HintCallback void int return SDL_Joystick return SDL_Joystick return const char return SDL_Joystick return SDL_Joystick return SDL_Joystick return int return SDL_Joystick int return SDL_Joystick int return return return SDL_Scancode return SDL_Scancode return SDL_Keycode return return const char return void int SDL_LogPriority SDL_LogOutputFunction void Uint32 const char const char SDL_Window return int int return SDL_Window int int return SDL_Surface int int return SDL_Cursor return int return SDL_mutex return SDL_mutex return Uint32 return SDL_sem return SDL_sem Uint32 return SDL_sem return SDL_cond SDL_cond return SDL_cond SDL_mutex Uint32 return Uint32 int Uint32 Uint32 Uint32 Uint32 return Uint32 return int return SDL_Palette const SDL_Color int int return const SDL_PixelFormat Uint8 Uint8 Uint8 return Uint32 const SDL_PixelFormat Uint8 Uint8 Uint8 float Uint16 int int return const SDL_Rect const SDL_Rect SDL_Rect return const SDL_Point int const SDL_Rect SDL_Rect return return int int Uint32 SDL_Window SDL_Renderer return SDL_Surface return SDL_Renderer SDL_RendererInfo return SDL_Renderer Uint32 int int int return SDL_Texture Uint32 int int int return SDL_Texture Uint8 Uint8 Uint8 return SDL_Texture Uint8 return SDL_Texture SDL_BlendMode return SDL_Texture const SDL_Rect const Uint8 int const Uint8 int const Uint8 int return SDL_Texture SDL_Renderer SDL_Texture return SDL_Renderer int int return SDL_Renderer const SDL_Rect return SDL_Renderer const SDL_Rect return SDL_Renderer float float return SDL_Renderer Uint8 Uint8 Uint8 Uint8 return SDL_Renderer SDL_BlendMode return SDL_Renderer return SDL_Renderer const SDL_Point int return SDL_Renderer const SDL_Point int return SDL_Renderer const SDL_Rect int return SDL_Renderer const SDL_Rect int return SDL_Renderer SDL_Texture const SDL_Rect const SDL_Rect const double const SDL_Point const SDL_RendererFlip return SDL_Renderer SDL_Renderer SDL_Texture return void int return return SDL_RWops return SDL_RWops return SDL_RWops return SDL_RWops return SDL_RWops Uint16 return SDL_RWops Uint32 return SDL_RWops Uint64 return const char unsigned int unsigned int unsigned int unsigned int Uint32 return SDL_Window SDL_Surface SDL_WindowShapeMode return size_t return void size_t return const char return void size_t size_t int(*) a int return int return int size_t return size_t return const wchar_t return const wchar_t size_t return const char size_t return const char size_t return char return char return const char int return int char int return long char int return Sint64 char int return const char return const char char int return const char char int return const char char return const char const char size_t return const char const char size_t return double return double return double return double return double return double return double int return float return const char const char return SDL_iconv_t const char size_t char size_t return Uint32 int int int Uint32 Uint32 Uint32 Uint32 return SDL_Surface SDL_Surface return SDL_RWops int return SDL_Surface int return SDL_Surface Uint32 return SDL_Surface Uint8 Uint8 Uint8 return SDL_Surface Uint8 return SDL_Surface SDL_BlendMode return SDL_Surface SDL_Rect SDL_Surface Uint32 Uint32 return SDL_Surface const SDL_Rect Uint32 return SDL_Surface const SDL_Rect SDL_Surface SDL_Rect return SDL_Surface const SDL_Rect SDL_Surface const SDL_Rect return SDL_Surface SDL_Rect SDL_Surface SDL_Rect return SDL_Thread return SDL_Thread return SDL_Thread int return SDL_TLSID const void void(*) return return Uint32 SDL_TimerID return int return SDL_TouchID int return return return const char return return int return int return int SDL_DisplayMode return int const SDL_DisplayMode SDL_DisplayMode return SDL_Window const SDL_DisplayMode return SDL_Window return const void return Uint32 return SDL_Window const char SDL_Window SDL_Surface SDL_Window const char return SDL_Window int int SDL_Window int int SDL_Window int int SDL_Window int int SDL_Window SDL_Window SDL_Window SDL_Window Uint32 return SDL_Window return SDL_Window SDL_bool SDL_Window float return SDL_Window const Uint16 const Uint16 const Uint16 return SDL_Window const char return SDL_GLattr int return SDL_Window return return SDL_Window int int return SDL_GLContext SDL_RWops int return return void return int int return double return SDL_bool return int int return SDL_AudioDeviceID const void Uint32 return SDL_AudioDeviceID int float float float return 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.

Definition at line 81 of file SDL_joystick.h.

Enumeration Type Documentation

SDL_JoystickPowerLevel

enum SDL_JoystickPowerLevel

Enumerator
SDL_JOYSTICK_POWER_UNKNOWN
SDL_JOYSTICK_POWER_EMPTY
SDL_JOYSTICK_POWER_LOW
SDL_JOYSTICK_POWER_MEDIUM
SDL_JOYSTICK_POWER_FULL
SDL_JOYSTICK_POWER_WIRED
SDL_JOYSTICK_POWER_MAX

Definition at line 97 of file SDL_joystick.h.

{
    SDL_JOYSTICK_POWER_UNKNOWN = -1,
    SDL_JOYSTICK_POWER_EMPTY,   /* <= 5% */
    SDL_JOYSTICK_POWER_LOW,     /* <= 20% */
    SDL_JOYSTICK_POWER_MEDIUM,  /* <= 70% */
    SDL_JOYSTICK_POWER_FULL,    /* <= 100% */
    SDL_JOYSTICK_POWER_WIRED,
    SDL_JOYSTICK_POWER_MAX
} SDL_JoystickPowerLevel;

SDL_JoystickType

enum SDL_JoystickType

Enumerator
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

Definition at line 83 of file SDL_joystick.h.

{
    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
} SDL_JoystickType;

Function Documentation

SDL_JoystickAttachVirtual()

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

Attaches a new virtual joystick. Returns the joystick's device index, or -1 if an error occurred.

Definition at line 471 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    return SDL_JoystickAttachVirtualInner(type, naxes, nbuttons, nhats);
#else
    return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}

References SDL_SetError.

SDL_JoystickClose()

void SDL_JoystickClose

(

SDL_Joystick *

joystick

)

Close a joystick previously opened with SDL_JoystickOpen().

Definition at line 976 of file SDL_joystick.c.

{
    SDL_Joystick *joysticklist;
    SDL_Joystick *joysticklistprev;
    int i;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return;
    }
 
    SDL_LockJoysticks();
 
    /* First decrement ref count */
    if (--joystick->ref_count > 0) {
        SDL_UnlockJoysticks();
        return;
    }
 
    if (SDL_updating_joystick) {
        SDL_UnlockJoysticks();
        return;
    }
 
    if (joystick->rumble_expiration) {
        SDL_JoystickRumble(joystick, 0, 0, 0);
    }
    if (joystick->trigger_rumble_expiration) {
        SDL_JoystickRumbleTriggers(joystick, 0, 0, 0);
    }
 
    joystick->driver->Close(joystick);
    joystick->hwdata = NULL;
 
    joysticklist = SDL_joysticks;
    joysticklistprev = NULL;
    while (joysticklist) {
        if (joystick == joysticklist) {
            if (joysticklistprev) {
                /* unlink this entry */
                joysticklistprev->next = joysticklist->next;
            } else {
                SDL_joysticks = joystick->next;
            }
            break;
        }
        joysticklistprev = joysticklist;
        joysticklist = joysticklist->next;
    }
 
    SDL_free(joystick->name);
    SDL_free(joystick->serial);
 
    /* Free the data associated with this joystick */
    SDL_free(joystick->axes);
    SDL_free(joystick->hats);
    SDL_free(joystick->balls);
    SDL_free(joystick->buttons);
    for (i = 0; i < joystick->ntouchpads; i++) {
        SDL_JoystickTouchpadInfo *touchpad = &joystick->touchpads[i];
        SDL_free(touchpad->fingers);
    }
    SDL_free(joystick->touchpads);
    SDL_free(joystick->sensors);
    SDL_free(joystick);
 
    SDL_UnlockJoysticks();
}

References SDL_JoystickTouchpadInfo::fingers, i, joystick, NULL, SDL_free, SDL_JoystickRumble(), SDL_JoystickRumbleTriggers(), SDL_joysticks, SDL_LockJoysticks(), SDL_PrivateJoystickValid(), SDL_UnlockJoysticks(), and SDL_updating_joystick.

Referenced by SDL_JoystickOpen(), SDL_JoystickQuit(), and SDL_JoystickUpdate().

SDL_JoystickCurrentPowerLevel()

SDL_JoystickPowerLevel SDL_JoystickCurrentPowerLevel

(

SDL_Joystick *

joystick

)

Return the battery level of this joystick

Definition at line 2493 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return SDL_JOYSTICK_POWER_UNKNOWN;
    }
    return joystick->epowerlevel;
}

References joystick, SDL_JOYSTICK_POWER_UNKNOWN, and SDL_PrivateJoystickValid().

SDL_JoystickDetachVirtual()

int SDL_JoystickDetachVirtual

(

int

device_index

)

Detaches a virtual joystick Returns 0 on success, or -1 if an error occurred.

Definition at line 482 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    SDL_JoystickDriver *driver;
 
    SDL_LockJoysticks();
    if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
        if (driver == &SDL_VIRTUAL_JoystickDriver) {
            const int result = SDL_JoystickDetachVirtualInner(device_index);
            SDL_UnlockJoysticks();
            return result;
        }
    }
    SDL_UnlockJoysticks();
 
    return SDL_SetError("Virtual joystick not found at provided index");
#else
    return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}

References SDL_GetDriverAndJoystickIndex(), SDL_LockJoysticks(), SDL_SetError, SDL_UnlockJoysticks(), and SDL_VIRTUAL_JoystickDriver.

SDL_JoystickEventState()

int SDL_JoystickEventState

(

int

state

)

Enable/disable joystick event polling.

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

The state can be one of SDL_QUERY, SDL_ENABLE or SDL_IGNORE.

Definition at line 1568 of file SDL_joystick.c.

{
#if SDL_EVENTS_DISABLED
    return SDL_DISABLE;
#else
    const Uint32 event_list[] = {
        SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
        SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, SDL_JOYDEVICEADDED, SDL_JOYDEVICEREMOVED
    };
    unsigned int i;
 
    switch (state) {
    case SDL_QUERY:
        state = SDL_DISABLE;
        for (i = 0; i < SDL_arraysize(event_list); ++i) {
            state = SDL_EventState(event_list[i], SDL_QUERY);
            if (state == SDL_ENABLE) {
                break;
            }
        }
        break;
    default:
        for (i = 0; i < SDL_arraysize(event_list); ++i) {
            SDL_EventState(event_list[i], state);
        }
        break;
    }
    return state;
#endif /* SDL_EVENTS_DISABLED */
}

References i, SDL_arraysize, SDL_DISABLE, SDL_ENABLE, SDL_EventState, SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, SDL_JOYDEVICEADDED, SDL_JOYDEVICEREMOVED, SDL_JOYHATMOTION, SDL_QUERY, and state.

SDL_JoystickFromInstanceID()

SDL_Joystick* SDL_JoystickFromInstanceID

(

SDL_JoystickID

instance_id

)

Return the SDL_Joystick associated with an instance id.

Definition at line 774 of file SDL_joystick.c.

{
    SDL_Joystick *joystick;
 
    SDL_LockJoysticks();
    for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
        if (joystick->instance_id == instance_id) {
            break;
        }
    }
    SDL_UnlockJoysticks();
    return joystick;
}

References joystick, SDL_joysticks, SDL_LockJoysticks(), and SDL_UnlockJoysticks().

SDL_JoystickFromPlayerIndex()

SDL_Joystick* SDL_JoystickFromPlayerIndex

(

int

player_index

)

Return the SDL_Joystick associated with a player index.

Definition at line 792 of file SDL_joystick.c.

{
    SDL_JoystickID instance_id;
    SDL_Joystick *joystick;
 
    SDL_LockJoysticks();
    instance_id = SDL_GetJoystickIDForPlayerIndex(player_index);
    for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
        if (joystick->instance_id == instance_id) {
            break;
        }
    }
    SDL_UnlockJoysticks();
    return joystick;
}

References joystick, SDL_GetJoystickIDForPlayerIndex(), SDL_joysticks, SDL_LockJoysticks(), and SDL_UnlockJoysticks().

SDL_JoystickGetAttached()

SDL_bool SDL_JoystickGetAttached

(

SDL_Joystick *

joystick

)

Returns SDL_TRUE if the joystick has been opened and currently connected, or SDL_FALSE if it has not.

Definition at line 748 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return SDL_FALSE;
    }
 
    return joystick->attached;
}

References joystick, SDL_FALSE, and SDL_PrivateJoystickValid().

SDL_JoystickGetAxis()

Sint16 SDL_JoystickGetAxis	(	SDL_Joystick *	joystick,
		int	axis
	)

Get the current 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.

Definition at line 640 of file SDL_joystick.c.

{
    Sint16 state;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return 0;
    }
    if (axis < joystick->naxes) {
        state = joystick->axes[axis].value;
    } else {
        SDL_SetError("Joystick only has %d axes", joystick->naxes);
        state = 0;
    }
    return state;
}

References axis, joystick, SDL_PrivateJoystickValid(), SDL_SetError, and state.

SDL_JoystickGetAxisInitialState()

SDL_bool 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.

Returns

SDL_TRUE if this axis has any initial value, or SDL_FALSE if not.

Definition at line 660 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return SDL_FALSE;
    }
    if (axis >= joystick->naxes) {
        SDL_SetError("Joystick only has %d axes", joystick->naxes);
        return SDL_FALSE;
    }
    if (state) {
        *state = joystick->axes[axis].initial_value;
    }
    return joystick->axes[axis].has_initial_value;
}

References axis, joystick, SDL_FALSE, SDL_PrivateJoystickValid(), SDL_SetError, and state.

SDL_JoystickGetBall()

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

Get the ball axis change since the last poll.

Returns

0, or -1 if you passed it invalid parameters.

The ball indices start at index 0.

Definition at line 699 of file SDL_joystick.c.

{
    int retval;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    retval = 0;
    if (ball < joystick->nballs) {
        if (dx) {
            *dx = joystick->balls[ball].dx;
        }
        if (dy) {
            *dy = joystick->balls[ball].dy;
        }
        joystick->balls[ball].dx = 0;
        joystick->balls[ball].dy = 0;
    } else {
        return SDL_SetError("Joystick only has %d balls", joystick->nballs);
    }
    return retval;
}

References joystick, retval, SDL_PrivateJoystickValid(), and SDL_SetError.

SDL_JoystickGetButton()

Uint8 SDL_JoystickGetButton	(	SDL_Joystick *	joystick,
		int	button
	)

Get the current state of a button on a joystick.

The button indices start at index 0.

Definition at line 727 of file SDL_joystick.c.

{
    Uint8 state;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return 0;
    }
    if (button < joystick->nbuttons) {
        state = joystick->buttons[button];
    } else {
        SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);
        state = 0;
    }
    return state;
}

References button, joystick, SDL_PrivateJoystickValid(), SDL_SetError, and state.

SDL_JoystickGetDeviceGUID()

SDL_JoystickGUID SDL_JoystickGetDeviceGUID

(

int

device_index

)

Return the GUID for the joystick at this index This can be called before any joysticks are opened.

Definition at line 2272 of file SDL_joystick.c.

{
    SDL_JoystickDriver *driver;
    SDL_JoystickGUID guid;
 
    SDL_LockJoysticks();
    if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
        guid = driver->GetDeviceGUID(device_index);
    } else {
        SDL_zero(guid);
    }
    SDL_UnlockJoysticks();
 
    return guid;
}

References SDL_JoystickDriver::GetDeviceGUID, SDL_GetDriverAndJoystickIndex(), SDL_LockJoysticks(), SDL_UnlockJoysticks(), and SDL_zero.

Referenced by SDL_JoystickGetDeviceProduct(), SDL_JoystickGetDeviceProductVersion(), SDL_JoystickGetDeviceType(), and SDL_JoystickGetDeviceVendor().

SDL_JoystickGetDeviceInstanceID()

SDL_JoystickID 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.

Definition at line 2329 of file SDL_joystick.c.

{
    SDL_JoystickDriver *driver;
    SDL_JoystickID instance_id = -1;
 
    SDL_LockJoysticks();
    if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
        instance_id = driver->GetDeviceInstanceID(device_index);
    }
    SDL_UnlockJoysticks();
 
    return instance_id;
}

References SDL_JoystickDriver::GetDeviceInstanceID, SDL_GetDriverAndJoystickIndex(), SDL_LockJoysticks(), and SDL_UnlockJoysticks().

Referenced by SDL_JoystickGetDeviceIndexFromInstanceID(), and SDL_JoystickGetDevicePlayerIndex().

SDL_JoystickGetDevicePlayerIndex()

int 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.

Definition at line 316 of file SDL_joystick.c.

{
    int player_index;
 
    SDL_LockJoysticks();
    player_index = SDL_GetPlayerIndexForJoystickID(SDL_JoystickGetDeviceInstanceID(device_index));
    SDL_UnlockJoysticks();
 
    return player_index;
}

References SDL_GetPlayerIndexForJoystickID(), SDL_JoystickGetDeviceInstanceID(), SDL_LockJoysticks(), and SDL_UnlockJoysticks().

SDL_JoystickGetDeviceProduct()

Uint16 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.

Definition at line 2297 of file SDL_joystick.c.

{
    Uint16 product;
    SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(device_index);
 
    SDL_GetJoystickGUIDInfo(guid, NULL, &product, NULL);
    return product;
}

References NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetDeviceGUID().

SDL_JoystickGetDeviceProductVersion()

Uint16 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.

Definition at line 2306 of file SDL_joystick.c.

{
    Uint16 version;
    SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(device_index);
 
    SDL_GetJoystickGUIDInfo(guid, NULL, NULL, &version);
    return version;
}

References NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetDeviceGUID().

SDL_JoystickGetDeviceType()

SDL_JoystickType SDL_JoystickGetDeviceType

(

int

device_index

)

Get the type of a joystick, if available. This can be called before any joysticks are opened.

Definition at line 2315 of file SDL_joystick.c.

{
    SDL_JoystickType type;
    SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(device_index);
 
    type = SDL_GetJoystickGUIDType(guid);
    if (type == SDL_JOYSTICK_TYPE_UNKNOWN) {
        if (SDL_IsGameController(device_index)) {
            type = SDL_JOYSTICK_TYPE_GAMECONTROLLER;
        }
    }
    return type;
}

References SDL_GetJoystickGUIDType(), SDL_IsGameController, SDL_JOYSTICK_TYPE_GAMECONTROLLER, SDL_JOYSTICK_TYPE_UNKNOWN, and SDL_JoystickGetDeviceGUID().

SDL_JoystickGetDeviceVendor()

Uint16 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.

Definition at line 2288 of file SDL_joystick.c.

{
    Uint16 vendor;
    SDL_JoystickGUID guid = SDL_JoystickGetDeviceGUID(device_index);
 
    SDL_GetJoystickGUIDInfo(guid, &vendor, NULL, NULL);
    return vendor;
}

References NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetDeviceGUID().

SDL_JoystickGetGUID()

SDL_JoystickGUID SDL_JoystickGetGUID

(

SDL_Joystick *

joystick

)

Return the GUID for this opened joystick

Definition at line 2360 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        SDL_JoystickGUID emptyGUID;
        SDL_zero(emptyGUID);
        return emptyGUID;
    }
    return joystick->guid;
}

References joystick, SDL_PrivateJoystickValid(), and SDL_zero.

Referenced by SDL_JoystickGetProduct(), SDL_JoystickGetProductVersion(), SDL_JoystickGetType(), and SDL_JoystickGetVendor().

SDL_JoystickGetGUIDFromString()

SDL_JoystickGUID SDL_JoystickGetGUIDFromString

(

const char *

pchGUID

)

Convert a string into a joystick guid

Definition at line 2465 of file SDL_joystick.c.

{
    SDL_JoystickGUID guid;
    int maxoutputbytes= sizeof(guid);
    size_t len = SDL_strlen(pchGUID);
    Uint8 *p;
    size_t i;
 
    /* Make sure it's even */
    len = (len) & ~0x1;
 
    SDL_memset(&guid, 0x00, sizeof(guid));
 
    p = (Uint8 *)&guid;
    for (i = 0; (i < len) && ((p - (Uint8 *)&guid) < maxoutputbytes); i+=2, p++) {
        *p = (nibble(pchGUID[i]) << 4) | nibble(pchGUID[i+1]);
    }
 
    return guid;
}

References i, nibble(), SDL_memset, and SDL_strlen.

SDL_JoystickGetGUIDString()

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

Return a string representation for this guid. pszGUID must point to at least 33 bytes (32 for the string plus a NULL terminator).

Definition at line 2420 of file SDL_joystick.c.

{
    static const char k_rgchHexToASCII[] = "0123456789abcdef";
    int i;
 
    if ((pszGUID == NULL) || (cbGUID <= 0)) {
        return;
    }
 
    for (i = 0; i < sizeof(guid.data) && i < (cbGUID-1)/2; i++) {
        /* each input byte writes 2 ascii chars, and might write a null byte. */
        /* If we don't have room for next input byte, stop */
        unsigned char c = guid.data[i];
 
        *pszGUID++ = k_rgchHexToASCII[c >> 4];
        *pszGUID++ = k_rgchHexToASCII[c & 0x0F];
    }
    *pszGUID = '\0';
}

References SDL_JoystickGUID::data, i, and NULL.

SDL_JoystickGetHat()

Uint8 SDL_JoystickGetHat	(	SDL_Joystick *	joystick,
		int	hat
	)

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

The hat indices start at index 0.

Returns

The return value is 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

Definition at line 679 of file SDL_joystick.c.

{
    Uint8 state;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return 0;
    }
    if (hat < joystick->nhats) {
        state = joystick->hats[hat];
    } else {
        SDL_SetError("Joystick only has %d hats", joystick->nhats);
        state = 0;
    }
    return state;
}

References joystick, SDL_PrivateJoystickValid(), SDL_SetError, and state.

SDL_JoystickGetPlayerIndex()

int SDL_JoystickGetPlayerIndex

(

SDL_Joystick *

joystick

)

Get the player index of an opened joystick, or -1 if it's not available

For XInput controllers this returns the XInput user index.

Get the player index of an opened joystick, or -1 if it's not available

Definition at line 825 of file SDL_joystick.c.

{
    int player_index;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    SDL_LockJoysticks();
    player_index = SDL_GetPlayerIndexForJoystickID(joystick->instance_id);
    SDL_UnlockJoysticks();
 
    return player_index;
}

References joystick, SDL_GetPlayerIndexForJoystickID(), SDL_LockJoysticks(), SDL_PrivateJoystickValid(), and SDL_UnlockJoysticks().

SDL_JoystickGetProduct()

Uint16 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.

Definition at line 2379 of file SDL_joystick.c.

{
    Uint16 product;
    SDL_JoystickGUID guid = SDL_JoystickGetGUID(joystick);
 
    SDL_GetJoystickGUIDInfo(guid, NULL, &product, NULL);
    return product;
}

References joystick, NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetGUID().

Referenced by SDL_JoystickAxesCenteredAtZero().

SDL_JoystickGetProductVersion()

Uint16 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.

Definition at line 2388 of file SDL_joystick.c.

{
    Uint16 version;
    SDL_JoystickGUID guid = SDL_JoystickGetGUID(joystick);
 
    SDL_GetJoystickGUIDInfo(guid, NULL, NULL, &version);
    return version;
}

References joystick, NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetGUID().

SDL_JoystickGetSerial()

const char* 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.

Definition at line 2397 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return NULL;
    }
    return joystick->serial;
}

References joystick, NULL, and SDL_PrivateJoystickValid().

SDL_JoystickGetType()

SDL_JoystickType SDL_JoystickGetType

(

SDL_Joystick *

joystick

)

Get the type of an opened joystick.

Definition at line 2405 of file SDL_joystick.c.

{
    SDL_JoystickType type;
    SDL_JoystickGUID guid = SDL_JoystickGetGUID(joystick);
 
    type = SDL_GetJoystickGUIDType(guid);
    if (type == SDL_JOYSTICK_TYPE_UNKNOWN) {
        if (joystick && joystick->is_game_controller) {
            type = SDL_JOYSTICK_TYPE_GAMECONTROLLER;
        }
    }
    return type;
}

References joystick, SDL_GetJoystickGUIDType(), SDL_JOYSTICK_TYPE_GAMECONTROLLER, SDL_JOYSTICK_TYPE_UNKNOWN, and SDL_JoystickGetGUID().

SDL_JoystickGetVendor()

Uint16 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.

Definition at line 2370 of file SDL_joystick.c.

{
    Uint16 vendor;
    SDL_JoystickGUID guid = SDL_JoystickGetGUID(joystick);
 
    SDL_GetJoystickGUIDInfo(guid, &vendor, NULL, NULL);
    return vendor;
}

References joystick, NULL, SDL_GetJoystickGUIDInfo(), and SDL_JoystickGetGUID().

Referenced by SDL_JoystickAxesCenteredAtZero().

SDL_JoystickHasLED()

SDL_bool SDL_JoystickHasLED

(

SDL_Joystick *

joystick

)

Return whether a joystick has an LED

Parameters

joystick

The joystick to query

Returns

SDL_TRUE, or SDL_FALSE if this joystick does not have a modifiable LED

Definition at line 925 of file SDL_joystick.c.

{
    SDL_bool result;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return SDL_FALSE;
    }
 
    SDL_LockJoysticks();
 
    result = joystick->driver->HasLED(joystick);
 
    SDL_UnlockJoysticks();
 
    return result;
}

References joystick, SDL_FALSE, SDL_LockJoysticks(), SDL_PrivateJoystickValid(), and SDL_UnlockJoysticks().

SDL_JoystickInstanceID()

SDL_JoystickID SDL_JoystickInstanceID

(

SDL_Joystick *

joystick

)

Get the instance ID of an opened joystick or -1 if the joystick is invalid.

Definition at line 761 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    return joystick->instance_id;
}

References joystick, and SDL_PrivateJoystickValid().

SDL_JoystickIsVirtual()

SDL_bool SDL_JoystickIsVirtual

(

int

device_index

)

Indicates whether or not a virtual-joystick is at a given device index.

Definition at line 504 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    SDL_JoystickDriver *driver;
    int driver_device_index;
    SDL_bool is_virtual = SDL_FALSE;
 
    SDL_LockJoysticks();
    if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &driver_device_index)) {
        if (driver == &SDL_VIRTUAL_JoystickDriver) {
            is_virtual = SDL_TRUE;
        }
    }
    SDL_UnlockJoysticks();
 
    return is_virtual;
#else
    return SDL_FALSE;
#endif
}

References SDL_FALSE, SDL_GetDriverAndJoystickIndex(), SDL_LockJoysticks(), SDL_TRUE, SDL_UnlockJoysticks(), and SDL_VIRTUAL_JoystickDriver.

SDL_JoystickName()

const char* SDL_JoystickName

(

SDL_Joystick *

joystick

)

Return the name for this currently opened joystick. If no name can be found, this function returns NULL.

Definition at line 812 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return NULL;
    }
 
    return joystick->name;
}

References joystick, NULL, and SDL_PrivateJoystickValid().

SDL_JoystickNameForIndex()

const char* SDL_JoystickNameForIndex

(

int

device_index

)

Get the implementation dependent name of a joystick. This can be called before any joysticks are opened. If no name can be found, this function returns NULL.

Definition at line 297 of file SDL_joystick.c.

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

References SDL_JoystickDriver::GetDeviceName, NULL, SDL_GetDriverAndJoystickIndex(), SDL_LockJoysticks(), and SDL_UnlockJoysticks().

SDL_JoystickNumAxes()

int SDL_JoystickNumAxes

(

SDL_Joystick *

joystick

)

Get the number of general axis controls on a joystick.

Definition at line 592 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
    return joystick->naxes;
}

References joystick, and SDL_PrivateJoystickValid().

SDL_JoystickNumBalls()

int 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.

Definition at line 616 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
    return joystick->nballs;
}

References joystick, and SDL_PrivateJoystickValid().

SDL_JoystickNumButtons()

int SDL_JoystickNumButtons

(

SDL_Joystick *

joystick

)

Get the number of buttons on a joystick.

Definition at line 628 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
    return joystick->nbuttons;
}

References joystick, and SDL_PrivateJoystickValid().

SDL_JoystickNumHats()

int SDL_JoystickNumHats

(

SDL_Joystick *

joystick

)

Get the number of POV hats on a joystick.

Definition at line 604 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
    return joystick->nhats;
}

References joystick, and SDL_PrivateJoystickValid().

SDL_JoystickOpen()

SDL_Joystick* SDL_JoystickOpen

(

int

device_index

)

Open a joystick for use. The index passed as an argument refers to the N'th joystick on the system. This index is not the value which will identify this joystick in future joystick events. The joystick's instance id (SDL_JoystickID) will be used there instead.

Returns

A joystick identifier, or NULL if an error occurred.

Definition at line 367 of file SDL_joystick.c.

{
    SDL_JoystickDriver *driver;
    SDL_JoystickID instance_id;
    SDL_Joystick *joystick;
    SDL_Joystick *joysticklist;
    const char *joystickname = NULL;
 
    SDL_LockJoysticks();
 
    if (!SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
        SDL_UnlockJoysticks();
        return NULL;
    }
 
    joysticklist = SDL_joysticks;
    /* If the joystick is already open, return it
     * it is important that we have a single joystick * for each instance id
     */
    instance_id = driver->GetDeviceInstanceID(device_index);
    while (joysticklist) {
        if (instance_id == joysticklist->instance_id) {
                joystick = joysticklist;
                ++joystick->ref_count;
                SDL_UnlockJoysticks();
                return joystick;
        }
        joysticklist = joysticklist->next;
    }
 
    /* Create and initialize the joystick */
    joystick = (SDL_Joystick *) SDL_calloc(sizeof(*joystick), 1);
    if (joystick == NULL) {
        SDL_OutOfMemory();
        SDL_UnlockJoysticks();
        return NULL;
    }
    joystick->driver = driver;
    joystick->instance_id = instance_id;
    joystick->attached = SDL_TRUE;
    joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
 
    if (driver->Open(joystick, device_index) < 0) {
        SDL_free(joystick);
        SDL_UnlockJoysticks();
        return NULL;
    }
 
    joystickname = driver->GetDeviceName(device_index);
    if (joystickname) {
        joystick->name = SDL_strdup(joystickname);
    } else {
        joystick->name = NULL;
    }
 
    joystick->guid = driver->GetDeviceGUID(device_index);
 
    if (joystick->naxes > 0) {
        joystick->axes = (SDL_JoystickAxisInfo *) SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
    }
    if (joystick->nhats > 0) {
        joystick->hats = (Uint8 *) SDL_calloc(joystick->nhats, sizeof(Uint8));
    }
    if (joystick->nballs > 0) {
        joystick->balls = (struct balldelta *) SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
    }
    if (joystick->nbuttons > 0) {
        joystick->buttons = (Uint8 *) SDL_calloc(joystick->nbuttons, sizeof(Uint8));
    }
    if (((joystick->naxes > 0) && !joystick->axes)
        || ((joystick->nhats > 0) && !joystick->hats)
        || ((joystick->nballs > 0) && !joystick->balls)
        || ((joystick->nbuttons > 0) && !joystick->buttons)) {
        SDL_OutOfMemory();
        SDL_JoystickClose(joystick);
        SDL_UnlockJoysticks();
        return NULL;
    }
 
    /* If this joystick is known to have all zero centered axes, skip the auto-centering code */
    if (SDL_JoystickAxesCenteredAtZero(joystick)) {
        int i;
 
        for (i = 0; i < joystick->naxes; ++i) {
            joystick->axes[i].has_initial_value = SDL_TRUE;
        }
    }
 
    joystick->is_game_controller = SDL_IsGameController(device_index);
 
    /* Add joystick to list */
    ++joystick->ref_count;
    /* Link the joystick in the list */
    joystick->next = SDL_joysticks;
    SDL_joysticks = joystick;
 
    SDL_UnlockJoysticks();
 
    driver->Update(joystick);
 
    return joystick;
}

References SDL_JoystickDriver::GetDeviceGUID, SDL_JoystickDriver::GetDeviceInstanceID, SDL_JoystickDriver::GetDeviceName, i, joystick, NULL, SDL_JoystickDriver::Open, SDL_calloc, SDL_free, SDL_GetDriverAndJoystickIndex(), SDL_IsGameController, SDL_JOYSTICK_POWER_UNKNOWN, SDL_JoystickAxesCenteredAtZero(), SDL_JoystickClose(), SDL_joysticks, SDL_LockJoysticks(), SDL_OutOfMemory, SDL_strdup, SDL_TRUE, SDL_UnlockJoysticks(), and SDL_JoystickDriver::Update.

SDL_JoystickRumble()

int 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

joystick	The joystick to vibrate
low_frequency_rumble	The intensity of the low frequency (left) rumble motor, from 0 to 0xFFFF
high_frequency_rumble	The intensity of the high frequency (right) rumble motor, from 0 to 0xFFFF
duration_ms	The duration of the rumble effect, in milliseconds

Returns

0, or -1 if rumble isn't supported on this joystick

Definition at line 856 of file SDL_joystick.c.

{
    int result;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    SDL_LockJoysticks();
    if (low_frequency_rumble == joystick->low_frequency_rumble &&
        high_frequency_rumble == joystick->high_frequency_rumble) {
        /* Just update the expiration */
        result = 0;
    } else {
        result = joystick->driver->Rumble(joystick, low_frequency_rumble, high_frequency_rumble);
    }
 
    /* Save the rumble value regardless of success, so we don't spam the driver */
    joystick->low_frequency_rumble = low_frequency_rumble;
    joystick->high_frequency_rumble = high_frequency_rumble;
 
    if ((low_frequency_rumble || high_frequency_rumble) && duration_ms) {
        joystick->rumble_expiration = SDL_GetTicks() + SDL_min(duration_ms, SDL_MAX_RUMBLE_DURATION_MS);
        if (!joystick->rumble_expiration) {
            joystick->rumble_expiration = 1;
        }
    } else {
        joystick->rumble_expiration = 0;
    }
    SDL_UnlockJoysticks();
 
    return result;
}

References joystick, SDL_GetTicks(), SDL_LockJoysticks(), SDL_MAX_RUMBLE_DURATION_MS, SDL_min, SDL_PrivateJoystickValid(), and SDL_UnlockJoysticks().

Referenced by SDL_JoystickClose(), and SDL_JoystickUpdate().

SDL_JoystickRumbleTriggers()

int 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.

Parameters

joystick	The joystick to vibrate
left_rumble	The intensity of the left trigger rumble motor, from 0 to 0xFFFF
right_rumble	The intensity of the right trigger rumble motor, from 0 to 0xFFFF
duration_ms	The duration of the rumble effect, in milliseconds

Returns

0, or -1 if trigger rumble isn't supported on this joystick

Definition at line 891 of file SDL_joystick.c.

{
    int result;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    SDL_LockJoysticks();
    if (left_rumble == joystick->left_trigger_rumble && right_rumble == joystick->right_trigger_rumble) {
        /* Just update the expiration */
        result = 0;
    } else {
        result = joystick->driver->RumbleTriggers(joystick, left_rumble, right_rumble);
    }
 
    /* Save the rumble value regardless of success, so we don't spam the driver */
    joystick->left_trigger_rumble = left_rumble;
    joystick->right_trigger_rumble = right_rumble;
 
    if ((left_rumble || right_rumble) && duration_ms) {
        joystick->trigger_rumble_expiration = SDL_GetTicks() + SDL_min(duration_ms, SDL_MAX_RUMBLE_DURATION_MS);
        if (!joystick->trigger_rumble_expiration) {
            joystick->trigger_rumble_expiration = 1;
        }
    } else {
        joystick->trigger_rumble_expiration = 0;
    }
    SDL_UnlockJoysticks();
 
    return result;
}

References joystick, SDL_GetTicks(), SDL_LockJoysticks(), SDL_MAX_RUMBLE_DURATION_MS, SDL_min, SDL_PrivateJoystickValid(), and SDL_UnlockJoysticks().

Referenced by SDL_JoystickClose(), and SDL_JoystickUpdate().

SDL_JoystickSetLED()

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

Update a joystick's LED color.

Parameters

joystick	The joystick to update
red	The intensity of the red LED
green	The intensity of the green LED
blue	The intensity of the blue LED

Returns

0, or -1 if this joystick does not have a modifiable LED

Definition at line 943 of file SDL_joystick.c.

{
    int result;
 
    if (!SDL_PrivateJoystickValid(joystick)) {
        return -1;
    }
 
    SDL_LockJoysticks();
 
    if (red == joystick->led_red &&
        green == joystick->led_green &&
        blue == joystick->led_blue) {
        /* Avoid spamming the driver */
        result = 0;
    } else {
        result = joystick->driver->SetLED(joystick, red, green, blue);
    }
 
    /* Save the LED value regardless of success, so we don't spam the driver */
    joystick->led_red = red;
    joystick->led_green = green;
    joystick->led_blue = blue;
 
    SDL_UnlockJoysticks();
 
    return result;
}

References joystick, red, SDL_LockJoysticks(), SDL_PrivateJoystickValid(), and SDL_UnlockJoysticks().

SDL_JoystickSetPlayerIndex()

void SDL_JoystickSetPlayerIndex	(	SDL_Joystick *	joystick,
		int	player_index
	)

Set the player index of an opened joystick

Definition at line 844 of file SDL_joystick.c.

{
    if (!SDL_PrivateJoystickValid(joystick)) {
        return;
    }
 
    SDL_LockJoysticks();
    SDL_SetJoystickIDForPlayerIndex(player_index, joystick->instance_id);
    SDL_UnlockJoysticks();
}

References joystick, SDL_LockJoysticks(), SDL_PrivateJoystickValid(), SDL_SetJoystickIDForPlayerIndex(), and SDL_UnlockJoysticks().

SDL_JoystickSetVirtualAxis()

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

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

Returns 0 on success, -1 on error.

Definition at line 526 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    return SDL_JoystickSetVirtualAxisInner(joystick, axis, value);
#else
    return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}

References axis, joystick, and SDL_SetError.

SDL_JoystickSetVirtualButton()

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

Definition at line 536 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    return SDL_JoystickSetVirtualButtonInner(joystick, button, value);
#else
    return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}

References button, joystick, and SDL_SetError.

SDL_JoystickSetVirtualHat()

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

Definition at line 546 of file SDL_joystick.c.

{
#if SDL_JOYSTICK_VIRTUAL
    return SDL_JoystickSetVirtualHatInner(joystick, hat, value);
#else
    return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}

References joystick, and SDL_SetError.

SDL_JoystickUpdate()

void 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.

Definition at line 1485 of file SDL_joystick.c.

{
    int i;
    SDL_Joystick *joystick, *next;
 
    if (!SDL_WasInit(SDL_INIT_JOYSTICK)) {
        return;
    }
 
    SDL_LockJoysticks();
 
    if (SDL_updating_joystick) {
        /* The joysticks are already being updated */
        SDL_UnlockJoysticks();
        return;
    }
 
    SDL_updating_joystick = SDL_TRUE;
 
    /* Make sure the list is unlocked while dispatching events to prevent application deadlocks */
    SDL_UnlockJoysticks();
 
#ifdef SDL_JOYSTICK_HIDAPI
    /* Special function for HIDAPI devices, as a single device can provide multiple SDL_Joysticks */
    HIDAPI_UpdateDevices();
#endif /* SDL_JOYSTICK_HIDAPI */
 
    for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
        if (joystick->attached) {
            /* This should always be true, but seeing a crash in the wild...? */
            if (joystick->driver) {
                joystick->driver->Update(joystick);
            }
 
            if (joystick->delayed_guide_button) {
                SDL_GameControllerHandleDelayedGuideButton(joystick);
            }
        }
 
        if (joystick->rumble_expiration) {
            SDL_LockJoysticks();
            /* Double check now that the lock is held */
            if (joystick->rumble_expiration &&
                SDL_TICKS_PASSED(SDL_GetTicks(), joystick->rumble_expiration)) {
                SDL_JoystickRumble(joystick, 0, 0, 0);
            }
            SDL_UnlockJoysticks();
        }
 
        if (joystick->trigger_rumble_expiration) {
            SDL_LockJoysticks();
            /* Double check now that the lock is held */
            if (joystick->trigger_rumble_expiration &&
                SDL_TICKS_PASSED(SDL_GetTicks(), joystick->trigger_rumble_expiration)) {
                SDL_JoystickRumbleTriggers(joystick, 0, 0, 0);
            }
            SDL_UnlockJoysticks();
        }
    }
 
    SDL_LockJoysticks();
 
    SDL_updating_joystick = SDL_FALSE;
 
    /* If any joysticks were closed while updating, free them here */
    for (joystick = SDL_joysticks; joystick; joystick = next) {
        next = joystick->next;
        if (joystick->ref_count <= 0) {
            SDL_JoystickClose(joystick);
        }
    }
 
    /* this needs to happen AFTER walking the joystick list above, so that any
       dangling hardware data from removed devices can be free'd
     */
    for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
        SDL_joystick_drivers[i]->Detect();
    }
 
    SDL_UnlockJoysticks();
}

References SDL_JoystickDriver::Detect, HIDAPI_UpdateDevices(), i, joystick, SDL_arraysize, SDL_FALSE, SDL_GameControllerHandleDelayedGuideButton(), SDL_GetTicks(), SDL_INIT_JOYSTICK, SDL_joystick_drivers, SDL_JoystickClose(), SDL_JoystickRumble(), SDL_JoystickRumbleTriggers(), SDL_joysticks, SDL_LockJoysticks(), SDL_TICKS_PASSED, SDL_TRUE, SDL_UnlockJoysticks(), SDL_updating_joystick, and SDL_WasInit.

SDL_LockJoysticks()

void 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.

Definition at line 672 of file SDL_dynapi_procs.h.

References SDL_joystick_lock, and SDL_LockMutex.

Referenced by SDL_JoystickClose(), SDL_JoystickDetachVirtual(), SDL_JoystickFromInstanceID(), SDL_JoystickFromPlayerIndex(), SDL_JoystickGetDeviceGUID(), SDL_JoystickGetDeviceIndexFromInstanceID(), SDL_JoystickGetDeviceInstanceID(), SDL_JoystickGetDevicePlayerIndex(), SDL_JoystickGetPlayerIndex(), SDL_JoystickHasLED(), SDL_JoystickIsVirtual(), SDL_JoystickNameForIndex(), SDL_JoystickOpen(), SDL_JoystickQuit(), SDL_JoystickRumble(), SDL_JoystickRumbleTriggers(), SDL_JoystickSetLED(), SDL_JoystickSetPlayerIndex(), SDL_JoystickUpdate(), SDL_NumJoysticks(), SDL_PrivateJoystickAdded(), SDL_PrivateJoystickGetAutoGamepadMapping(), and SDL_PrivateJoystickRemoved().

SDL_NumJoysticks()

int SDL_NumJoysticks

(

void

)

Count the number of joysticks attached to the system right now

Definition at line 247 of file SDL_joystick.c.

{
    int i, total_joysticks = 0;
    SDL_LockJoysticks();
    for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
        total_joysticks += SDL_joystick_drivers[i]->GetCount();
    }
    SDL_UnlockJoysticks();
    return total_joysticks;
}

References SDL_JoystickDriver::GetCount, i, SDL_arraysize, SDL_joystick_drivers, SDL_LockJoysticks(), and SDL_UnlockJoysticks().

Referenced by SDL_JoystickGetDeviceIndexFromInstanceID().

SDL_UnlockJoysticks()

void SDL_UnlockJoysticks

(

void

)

Definition at line 110 of file SDL_joystick.c.

{
    if (SDL_joystick_lock) {
        SDL_UnlockMutex(SDL_joystick_lock);
    }
}

References SDL_joystick_lock, and SDL_UnlockMutex.

Referenced by SDL_JoystickClose(), SDL_JoystickDetachVirtual(), SDL_JoystickFromInstanceID(), SDL_JoystickFromPlayerIndex(), SDL_JoystickGetDeviceGUID(), SDL_JoystickGetDeviceIndexFromInstanceID(), SDL_JoystickGetDeviceInstanceID(), SDL_JoystickGetDevicePlayerIndex(), SDL_JoystickGetPlayerIndex(), SDL_JoystickHasLED(), SDL_JoystickIsVirtual(), SDL_JoystickNameForIndex(), SDL_JoystickOpen(), SDL_JoystickQuit(), SDL_JoystickRumble(), SDL_JoystickRumbleTriggers(), SDL_JoystickSetLED(), SDL_JoystickSetPlayerIndex(), SDL_JoystickUpdate(), SDL_NumJoysticks(), SDL_PrivateJoystickAdded(), SDL_PrivateJoystickGetAutoGamepadMapping(), and SDL_PrivateJoystickRemoved().