include/SDL_joystick.h
author Sam Lantinga <slouken@libsdl.org>
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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 *  \file SDL_joystick.h
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 *
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 *  Include file for SDL joystick event handling
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 *
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 * The term "device_index" identifies currently plugged in joystick devices between 0 and SDL_NumJoysticks, with the exact joystick
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 *   behind a device_index changing as joysticks are plugged and unplugged.
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 * The term "instance_id" is the current instantiation of a joystick device in the system, if the joystick is removed and then re-inserted
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 *   then it will get a new instance_id, instance_id's are monotonically increasing identifiers of a joystick plugged in.
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 *
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 * The term JoystickGUID is a stable 128-bit identifier for a joystick device that does not change over time, it identifies class of
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 *   the device (a X360 wired controller for example). This identifier is platform dependent.
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 *
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 *
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 */
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#ifndef _SDL_joystick_h
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#define _SDL_joystick_h
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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 *  \file SDL_joystick.h
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 *
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 *  In order to use these functions, SDL_Init() must have been called
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 *  with the ::SDL_INIT_JOYSTICK flag.  This causes SDL to scan the system
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 *  for joysticks, and load appropriate drivers.
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 */
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/* The joystick structure used to identify an SDL joystick */
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struct _SDL_Joystick;
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typedef struct _SDL_Joystick SDL_Joystick;
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/* A structure that encodes the stable unique id for a joystick device */
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typedef struct {
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    Uint8 data[16];
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} SDL_JoystickGUID;
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typedef Sint32 SDL_JoystickID;
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/* Function prototypes */
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/**
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 *  Count the number of joysticks attached to the system right now
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 */
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extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
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/**
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 *  Get the implementation dependent name of a joystick.
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 *  This can be called before any joysticks are opened.
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 *  If no name can be found, this function returns NULL.
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 */
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extern DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex(int device_index);
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/**
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 *  Open a joystick for use.
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 *  The index passed as an argument refers tothe N'th joystick on the system.
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 *  This index is the value which will identify this joystick in future joystick
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 *  events.
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 *
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 *  \return A joystick identifier, or NULL if an error occurred.
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 */
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extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index);
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/**
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 *  Return the name for this currently opened joystick.
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 *  If no name can be found, this function returns NULL.
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 */
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extern DECLSPEC const char *SDLCALL SDL_JoystickName(SDL_Joystick * joystick);
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/**
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 *  Return the GUID for the joystick at this index
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 */
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extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID(int device_index);
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/**
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 *  Return the GUID for this opened joystick
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 */
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extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID(SDL_Joystick * joystick);
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/**
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 *  Return a string representation for this guid. pszGUID must point to at least 33 bytes
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 *  (32 for the string plus a NULL terminator).
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 */
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extern DECLSPEC void SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID);
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/**
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 *  convert a string into a joystick formatted guid
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 */
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extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString(const char *pchGUID);
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/**
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 *  Returns SDL_TRUE if the joystick has been opened and currently connected, or SDL_FALSE if it has not.
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached(SDL_Joystick * joystick);
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/**
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 *  Get the instance ID of an opened joystick or -1 if the joystick is invalid.
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 */
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extern DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID(SDL_Joystick * joystick);
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/**
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 *  Get the number of general axis controls on a joystick.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick * joystick);
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/**
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 *  Get the number of trackballs on a joystick.
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 *
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 *  Joystick trackballs have only relative motion events associated
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 *  with them and their state cannot be polled.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick * joystick);
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/**
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 *  Get the number of POV hats on a joystick.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick * joystick);
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/**
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 *  Get the number of buttons on a joystick.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick * joystick);
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/**
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 *  Update the current state of the open joysticks.
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 *
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 *  This is called automatically by the event loop if any joystick
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 *  events are enabled.
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 */
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extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);
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/**
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 *  Enable/disable joystick event polling.
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 *
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 *  If joystick events are disabled, you must call SDL_JoystickUpdate()
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 *  yourself and check the state of the joystick when you want joystick
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 *  information.
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 *
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 *  The state can be one of ::SDL_QUERY, ::SDL_ENABLE or ::SDL_IGNORE.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state);
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/**
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 *  Get the current state of an axis control on a joystick.
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 *
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 *  The state is a value ranging from -32768 to 32767.
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 *
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 *  The axis indices start at index 0.
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 */
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extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick * joystick,
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                                                   int axis);
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/**
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 *  \name Hat positions
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 */
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/*@{*/
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#define SDL_HAT_CENTERED    0x00
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#define SDL_HAT_UP      0x01
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#define SDL_HAT_RIGHT       0x02
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#define SDL_HAT_DOWN        0x04
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#define SDL_HAT_LEFT        0x08
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#define SDL_HAT_RIGHTUP     (SDL_HAT_RIGHT|SDL_HAT_UP)
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#define SDL_HAT_RIGHTDOWN   (SDL_HAT_RIGHT|SDL_HAT_DOWN)
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#define SDL_HAT_LEFTUP      (SDL_HAT_LEFT|SDL_HAT_UP)
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#define SDL_HAT_LEFTDOWN    (SDL_HAT_LEFT|SDL_HAT_DOWN)
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/*@}*/
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/**
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 *  Get the current state of a POV hat on a joystick.
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 *
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 *  The hat indices start at index 0.
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 *
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 *  \return The return value is one of the following positions:
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 *           - ::SDL_HAT_CENTERED
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 *           - ::SDL_HAT_UP
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 *           - ::SDL_HAT_RIGHT
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 *           - ::SDL_HAT_DOWN
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 *           - ::SDL_HAT_LEFT
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 *           - ::SDL_HAT_RIGHTUP
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 *           - ::SDL_HAT_RIGHTDOWN
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 *           - ::SDL_HAT_LEFTUP
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 *           - ::SDL_HAT_LEFTDOWN
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 */
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extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick * joystick,
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                                                 int hat);
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/**
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 *  Get the ball axis change since the last poll.
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 *
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 *  \return 0, or -1 if you passed it invalid parameters.
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 *
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 *  The ball indices start at index 0.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick * joystick,
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                                                int ball, int *dx, int *dy);
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/**
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 *  Get the current state of a button on a joystick.
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 *
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 *  The button indices start at index 0.
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 */
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extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick,
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                                                    int button);
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/**
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 *  Close a joystick previously opened with SDL_JoystickOpen().
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 */
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extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* _SDL_joystick_h */
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/* vi: set ts=4 sw=4 expandtab: */