SDL/include/SDL3/SDL_joystick.h

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2023 Sam Lantinga <[email protected]>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

/**
 *  \file SDL_joystick.h
 *
 *  Include file for SDL joystick event handling
 *
 *  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.
 */

#ifndef SDL_joystick_h_
#define SDL_joystick_h_

#include <SDL3/SDL_stdinc.h>
#include <SDL3/SDL_error.h>
#include <SDL3/SDL_guid.h>
#include <SDL3/SDL_mutex.h>
#include <SDL3/SDL_properties.h>

#include <SDL3/SDL_begin_code.h>
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif

/**
 *  \file SDL_joystick.h
 *
 *  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
 */

/**
 * The joystick structure used to identify an SDL joystick
 */
#ifdef SDL_THREAD_SAFETY_ANALYSIS
extern SDL_Mutex *SDL_joystick_lock;
#endif
struct SDL_Joystick;
typedef struct SDL_Joystick SDL_Joystick;

/* A structure that encodes the stable unique id for a joystick device */
typedef SDL_GUID SDL_JoystickGUID;

/**
 * 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 1 and increments from there. The value 0 is an invalid ID.
 */
typedef Uint32 SDL_JoystickID;

typedef enum
{
    SDL_JOYSTICK_TYPE_UNKNOWN,
    SDL_JOYSTICK_TYPE_GAMEPAD,
    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;

typedef enum
{
    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;

#define SDL_JOYSTICK_AXIS_MAX   32767
#define SDL_JOYSTICK_AXIS_MIN   -32768

/* Set max recognized G-force from accelerometer
   See src/joystick/uikit/SDL_sysjoystick.m for notes on why this is needed
 */
#define SDL_IPHONE_MAX_GFORCE 5.0


/* Function prototypes */

/**
 * Locking for atomic access to the joystick API
 *
 * The SDL joystick functions are thread-safe, however you can lock the
 * joysticks while processing to guarantee that the joystick list won't change
 * and joystick and gamepad events will not be delivered.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC void SDLCALL SDL_LockJoysticks(void) SDL_ACQUIRE(SDL_joystick_lock);

/**
 * Unlocking for atomic access to the joystick API
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC void SDLCALL SDL_UnlockJoysticks(void) SDL_RELEASE(SDL_joystick_lock);

/**
 * Get a list of currently connected joysticks.
 *
 * \param count a pointer filled in with the number of joysticks returned
 * \returns a 0 terminated array of joystick instance IDs which should be
 *          freed with SDL_free(), or NULL on error; call SDL_GetError() for
 *          more details.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC SDL_JoystickID *SDLCALL SDL_GetJoysticks(int *count);

/**
 * Get the implementation dependent name of a joystick.
 *
 * This can be called before any joysticks are opened.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickName
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC const char *SDLCALL SDL_GetJoystickInstanceName(SDL_JoystickID instance_id);

/**
 * Get the implementation dependent path of a joystick.
 *
 * This can be called before any joysticks are opened.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickPath
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC const char *SDLCALL SDL_GetJoystickInstancePath(SDL_JoystickID instance_id);

/**
 * Get the player index of a joystick.
 *
 * This can be called before any joysticks are opened.
 *
 * \param instance_id the joystick instance ID
 * \returns the player index of a joystick, or -1 if it's not available
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_GetJoystickPlayerIndex
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC int SDLCALL SDL_GetJoystickInstancePlayerIndex(SDL_JoystickID instance_id);

/**
 * Get the implementation-dependent GUID of a joystick.
 *
 * This can be called before any joysticks are opened.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickGUID
 * \sa SDL_GetJoystickGUIDString
 */
extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_GetJoystickInstanceGUID(SDL_JoystickID instance_id);

/**
 * 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.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickInstanceVendor(SDL_JoystickID instance_id);

/**
 * 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.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickInstanceProduct(SDL_JoystickID instance_id);

/**
 * 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.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickInstanceProductVersion(SDL_JoystickID instance_id);

/**
 * Get the type of a joystick, if available.
 *
 * This can be called before any joysticks are opened.
 *
 * \param instance_id the joystick instance ID
 * \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 3.0.0.
 */
extern DECLSPEC SDL_JoystickType SDLCALL SDL_GetJoystickInstanceType(SDL_JoystickID instance_id);

/**
 * Open a joystick for use.
 *
 * The joystick subsystem must be initialized before a joystick can be opened
 * for use.
 *
 * \param instance_id the joystick instance ID
 * \returns a joystick identifier or NULL if an error occurred; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_CloseJoystick
 */
extern DECLSPEC SDL_Joystick *SDLCALL SDL_OpenJoystick(SDL_JoystickID instance_id);

/**
 * Get the SDL_Joystick associated with an instance ID, if it has been opened.
 *
 * \param instance_id the instance ID to get the SDL_Joystick for
 * \returns an SDL_Joystick on success or NULL on failure or if it hasn't been
 *          opened yet; call SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_Joystick *SDLCALL SDL_GetJoystickFromInstanceID(SDL_JoystickID instance_id);

/**
 * Get the SDL_Joystick associated with a player index.
 *
 * \param player_index the 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 3.0.0.
 */
extern DECLSPEC SDL_Joystick *SDLCALL SDL_GetJoystickFromPlayerIndex(int player_index);

/**
 * Attach a new virtual joystick.
 *
 * \param type type of joystick
 * \param naxes number of axes
 * \param nbuttons number of buttons
 * \param nhats number of hats
 * \returns the joystick instance ID, or 0 if an error occurred; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_JoystickID SDLCALL SDL_AttachVirtualJoystick(SDL_JoystickType type,
                                                      int naxes,
                                                      int nbuttons,
                                                      int nhats);

/**
 * 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_AttachVirtualJoystickEx()
 *  All other elements of this structure are optional and can be left 0.
 *
 * \sa SDL_AttachVirtualJoystickEx
 */
typedef struct SDL_VirtualJoystickDesc
{
    Uint16 version;     /**< `SDL_VIRTUAL_JOYSTICK_DESC_VERSION` */
    Uint16 type;        /**< `SDL_JoystickType` */
    Uint16 naxes;       /**< the number of axes on this joystick */
    Uint16 nbuttons;    /**< the number of buttons on this joystick */
    Uint16 nhats;       /**< the number of hats on this joystick */
    Uint16 vendor_id;   /**< the USB vendor ID of this joystick */
    Uint16 product_id;  /**< the USB product ID of this joystick */
    Uint16 padding;     /**< unused */
    Uint32 button_mask; /**< A mask of which buttons are valid for this controller
                             e.g. (1 << SDL_GAMEPAD_BUTTON_SOUTH) */
    Uint32 axis_mask;   /**< A mask of which axes are valid for this controller
                             e.g. (1 << SDL_GAMEPAD_AXIS_LEFTX) */
    const char *name;   /**< the name of the joystick */

    void *userdata;     /**< User data pointer passed to callbacks */
    void (SDLCALL *Update)(void *userdata); /**< Called when the joystick state should be updated */
    void (SDLCALL *SetPlayerIndex)(void *userdata, int player_index); /**< Called when the player index is set */
    int (SDLCALL *Rumble)(void *userdata, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble); /**< Implements SDL_RumbleJoystick() */
    int (SDLCALL *RumbleTriggers)(void *userdata, Uint16 left_rumble, Uint16 right_rumble); /**< Implements SDL_RumbleJoystickTriggers() */
    int (SDLCALL *SetLED)(void *userdata, Uint8 red, Uint8 green, Uint8 blue); /**< Implements SDL_SetJoystickLED() */
    int (SDLCALL *SendEffect)(void *userdata, const void *data, int size); /**< Implements SDL_SendJoystickEffect() */

} SDL_VirtualJoystickDesc;

/**
 * The current version of the SDL_VirtualJoystickDesc structure
 */
#define SDL_VIRTUAL_JOYSTICK_DESC_VERSION   1

/**
 * Attach a new virtual joystick with extended properties.
 *
 * \param desc Joystick description
 * \returns the joystick instance ID, or 0 if an error occurred; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_JoystickID SDLCALL SDL_AttachVirtualJoystickEx(const SDL_VirtualJoystickDesc *desc);

/**
 * Detach a virtual joystick.
 *
 * \param instance_id the joystick instance ID, previously returned from
 *                    SDL_AttachVirtualJoystick()
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_DetachVirtualJoystick(SDL_JoystickID instance_id);

/**
 * Query whether or not a joystick is virtual.
 *
 * \param instance_id the joystick instance ID
 * \returns SDL_TRUE if the joystick is virtual, SDL_FALSE otherwise.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_bool SDLCALL SDL_IsJoystickVirtual(SDL_JoystickID instance_id);

/**
 * 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_UpdateJoysticks, 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`.
 *
 * \param joystick the virtual joystick on which to set state.
 * \param axis the specific axis on the virtual joystick to set.
 * \param value the new value for the specified axis.
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SetJoystickVirtualAxis(SDL_Joystick *joystick, int axis, Sint16 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_UpdateJoysticks, 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.
 *
 * \param joystick the virtual joystick on which to set state.
 * \param button the specific button on the virtual joystick to set.
 * \param value the new value for the specified button.
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SetJoystickVirtualButton(SDL_Joystick *joystick, int button, 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_UpdateJoysticks, 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.
 *
 * \param joystick the virtual joystick on which to set state.
 * \param hat the specific hat on the virtual joystick to set.
 * \param value the new value for the specified hat.
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SetJoystickVirtualHat(SDL_Joystick *joystick, int hat, Uint8 value);

/**
 * Get the properties associated with a joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns a valid property ID on success or 0 on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_GetProperty
 * \sa SDL_SetProperty
 */
extern DECLSPEC SDL_PropertiesID SDLCALL SDL_GetJoystickProperties(SDL_Joystick *joystick);

/**
 * Get the implementation dependent name of a joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickInstanceName
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC const char *SDLCALL SDL_GetJoystickName(SDL_Joystick *joystick);

/**
 * Get the implementation dependent path of a joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickInstancePath
 */
extern DECLSPEC const char *SDLCALL SDL_GetJoystickPath(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.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the player index, or -1 if it's not available.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_GetJoystickPlayerIndex(SDL_Joystick *joystick);

/**
 * Set the player index of an opened joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \param player_index Player index to assign to this joystick, or -1 to clear
 *                     the player index and turn off player LEDs.
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SetJoystickPlayerIndex(SDL_Joystick *joystick, int player_index);

/**
 * Get the implementation-dependent GUID for the joystick.
 *
 * This function requires an open joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \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 3.0.0.
 *
 * \sa SDL_GetJoystickInstanceGUID
 * \sa SDL_GetJoystickGUIDString
 */
extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_GetJoystickGUID(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.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the USB vendor ID of the selected joystick, or 0 if unavailable.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickVendor(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.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the USB product ID of the selected joystick, or 0 if unavailable.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickProduct(SDL_Joystick *joystick);

/**
 * Get the product version of an opened joystick, if available.
 *
 * If the product version isn't available this function returns 0.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the product version of the selected joystick, or 0 if unavailable.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickProductVersion(SDL_Joystick *joystick);

/**
 * Get the firmware version of an opened joystick, if available.
 *
 * If the firmware version isn't available this function returns 0.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the firmware version of the selected joystick, or 0 if
 *          unavailable.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC Uint16 SDLCALL SDL_GetJoystickFirmwareVersion(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.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the serial number of the selected joystick, or NULL if
 *          unavailable.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC const char * SDLCALL SDL_GetJoystickSerial(SDL_Joystick *joystick);

/**
 * Get the type of an opened joystick.
 *
 * \param joystick the SDL_Joystick obtained from SDL_OpenJoystick()
 * \returns the SDL_JoystickType of the selected joystick.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_JoystickType SDLCALL SDL_GetJoystickType(SDL_Joystick *joystick);

/**
 * Get an ASCII string representation for a given SDL_JoystickGUID.
 *
 * You should supply at least 33 bytes for pszGUID.
 *
 * \param guid the SDL_JoystickGUID you wish to convert to string
 * \param pszGUID buffer in which to write the ASCII string
 * \param cbGUID the size of pszGUID
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_GetJoystickInstanceGUID
 * \sa SDL_GetJoystickGUID
 * \sa SDL_GetJoystickGUIDFromString
 */
extern DECLSPEC int SDLCALL SDL_GetJoystickGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID);

/**
 * 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.
 *
 * \param pchGUID string containing an ASCII representation of a GUID
 * \returns a SDL_JoystickGUID structure.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_GetJoystickGUIDString
 */
extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_GetJoystickGUIDFromString(const char *pchGUID);

/**
 * Get the device information encoded in a SDL_JoystickGUID structure
 *
 * \param guid the SDL_JoystickGUID you wish to get info about
 * \param vendor A pointer filled in with the device VID, or 0 if not
 *               available
 * \param product A pointer filled in with the device PID, or 0 if not
 *                available
 * \param version A pointer filled in with the device version, or 0 if not
 *                available
 * \param crc16 A 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 3.0.0.
 *
 * \sa SDL_GetJoystickInstanceGUID
 */
extern DECLSPEC void SDLCALL SDL_GetJoystickGUIDInfo(SDL_JoystickGUID guid, Uint16 *vendor, Uint16 *product, Uint16 *version, Uint16 *crc16);

/**
 * Get the status of a specified joystick.
 *
 * \param joystick the 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 3.0.0.
 *
 * \sa SDL_CloseJoystick
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickConnected(SDL_Joystick *joystick);

/**
 * Get the instance ID of an opened joystick.
 *
 * \param joystick an SDL_Joystick structure containing joystick information
 * \returns the instance ID of the specified joystick on success or 0 on
 *          failure; call SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC SDL_JoystickID SDLCALL SDL_GetJoystickInstanceID(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.
 *
 * \param joystick an 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 3.0.0.
 *
 * \sa SDL_GetJoystickAxis
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC int SDLCALL SDL_GetNumJoystickAxes(SDL_Joystick *joystick);

/**
 * Get the number of POV hats on a joystick.
 *
 * \param joystick an 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 3.0.0.
 *
 * \sa SDL_GetJoystickHat
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC int SDLCALL SDL_GetNumJoystickHats(SDL_Joystick *joystick);

/**
 * Get the number of buttons on a joystick.
 *
 * \param joystick an 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 3.0.0.
 *
 * \sa SDL_GetJoystickButton
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC int SDLCALL SDL_GetNumJoystickButtons(SDL_Joystick *joystick);

/**
 * Set the state of joystick event processing.
 *
 * If joystick events are disabled, you must call SDL_UpdateJoysticks()
 * yourself and check the state of the joystick when you want joystick
 * information.
 *
 * \param enabled whether to process joystick events or not
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_JoystickEventsEnabled
 */
extern DECLSPEC void SDLCALL SDL_SetJoystickEventsEnabled(SDL_bool enabled);

/**
 * Query the state of joystick event processing.
 *
 * If joystick events are disabled, you must call SDL_UpdateJoysticks()
 * yourself and check the state of the joystick when you want joystick
 * information.
 *
 * \returns SDL_TRUE if joystick events are being processed, SDL_FALSE
 *          otherwise.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_SetJoystickEventsEnabled
 */
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickEventsEnabled(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 3.0.0.
 */
extern DECLSPEC void SDLCALL SDL_UpdateJoysticks(void);

/**
 * 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_GetJoystickAxis() 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.
 *
 * \param joystick an SDL_Joystick structure containing joystick information
 * \param axis the 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 3.0.0.
 *
 * \sa SDL_GetNumJoystickAxes
 */
extern DECLSPEC Sint16 SDLCALL SDL_GetJoystickAxis(SDL_Joystick *joystick,
                                                   int axis);

/**
 * 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.
 *
 * \param joystick an SDL_Joystick structure containing joystick information
 * \param axis the axis to query; the axis indices start at index 0
 * \param state Upon 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 3.0.0.
 */
extern DECLSPEC SDL_bool SDLCALL SDL_GetJoystickAxisInitialState(SDL_Joystick *joystick,
                                                   int axis, Sint16 *state);

/**
 *  \name 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)
/* @} */

/**
 * 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`
 *
 * \param joystick an SDL_Joystick structure containing joystick information
 * \param hat the hat index to get the state from; indices start at index 0
 * \returns the current hat position.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_GetNumJoystickHats
 */
extern DECLSPEC Uint8 SDLCALL SDL_GetJoystickHat(SDL_Joystick *joystick,
                                                 int hat);

/**
 * Get the current state of a button on a joystick.
 *
 * \param joystick an SDL_Joystick structure containing joystick information
 * \param button the 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 3.0.0.
 *
 * \sa SDL_GetNumJoystickButtons
 */
extern DECLSPEC Uint8 SDLCALL SDL_GetJoystickButton(SDL_Joystick *joystick,
                                                    int button);

/**
 * Start a rumble effect.
 *
 * Each call to this function cancels any previous rumble effect, and calling
 * it with 0 intensity stops any rumbling.
 *
 * \param joystick The joystick to vibrate
 * \param low_frequency_rumble The intensity of the low frequency (left)
 *                             rumble motor, from 0 to 0xFFFF
 * \param high_frequency_rumble The intensity of the high frequency (right)
 *                              rumble motor, from 0 to 0xFFFF
 * \param duration_ms The 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 3.0.0.
 *
 * \sa SDL_JoystickHasRumble
 */
extern DECLSPEC int SDLCALL SDL_RumbleJoystick(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_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_RumbleJoystick()
 * instead.
 *
 * \param joystick The joystick to vibrate
 * \param left_rumble The intensity of the left trigger rumble motor, from 0
 *                    to 0xFFFF
 * \param right_rumble The intensity of the right trigger rumble motor, from 0
 *                     to 0xFFFF
 * \param duration_ms The duration of the rumble effect, in milliseconds
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_JoystickHasRumbleTriggers
 */
extern DECLSPEC int SDLCALL SDL_RumbleJoystickTriggers(SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble, Uint32 duration_ms);

/**
 * 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.
 *
 * \param joystick The joystick to query
 * \returns SDL_TRUE if the joystick has a modifiable LED, SDL_FALSE
 *          otherwise.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasLED(SDL_Joystick *joystick);

/**
 * Query whether a joystick has rumble support.
 *
 * \param joystick The joystick to query
 * \returns SDL_TRUE if the joystick has rumble, SDL_FALSE otherwise.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_RumbleJoystick
 */
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumble(SDL_Joystick *joystick);

/**
 * Query whether a joystick has rumble support on triggers.
 *
 * \param joystick The joystick to query
 * \returns SDL_TRUE if the joystick has trigger rumble, SDL_FALSE otherwise.
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_RumbleJoystickTriggers
 */
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumbleTriggers(SDL_Joystick *joystick);

/**
 * 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.
 *
 * \param joystick The joystick to update
 * \param red The intensity of the red LED
 * \param green The intensity of the green LED
 * \param blue The intensity of the blue LED
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SetJoystickLED(SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue);

/**
 * Send a joystick specific effect packet
 *
 * \param joystick The joystick to affect
 * \param data The data to send to the joystick
 * \param size The size of the data to send to the joystick
 * \returns 0 on success or a negative error code on failure; call
 *          SDL_GetError() for more information.
 *
 * \since This function is available since SDL 3.0.0.
 */
extern DECLSPEC int SDLCALL SDL_SendJoystickEffect(SDL_Joystick *joystick, const void *data, int size);

/**
 * Close a joystick previously opened with SDL_OpenJoystick().
 *
 * \param joystick The joystick device to close
 *
 * \since This function is available since SDL 3.0.0.
 *
 * \sa SDL_OpenJoystick
 */
extern DECLSPEC void SDLCALL SDL_CloseJoystick(SDL_Joystick *joystick);

/**
 * Get the battery level of a joystick as SDL_JoystickPowerLevel.
 *
 * \param joystick the 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 3.0.0.
 */
extern DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_GetJoystickPowerLevel(SDL_Joystick *joystick);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include <SDL3/SDL_close_code.h>

#endif /* SDL_joystick_h_ */