/*    SDL - Simple DirectMedia Layer    Copyright (C) 1997-2006 Sam Lantinga    This library is free software; you can redistribute it and/or    modify it under the terms of the GNU Lesser General Public    License as published by the Free Software Foundation; either    version 2.1 of the License, or (at your option) any later version.    This library is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU    Lesser General Public License for more details.    You should have received a copy of the GNU Lesser General Public    License along with this library; if not, write to the Free Software    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA    Sam Lantinga    slouken@libsdl.org*//* Include file for SDL joystick event handling */#ifndef _SDL_joystick_h#define _SDL_joystick_h#include "SDL_stdinc.h"#include "SDL_error.h"#include "begin_code.h"/* Set up for C function definitions, even when using C++ */#ifdef __cplusplusextern "C" {#endif/* 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.*//* The joystick structure used to identify an SDL joystick */struct _SDL_Joystick;typedef struct _SDL_Joystick SDL_Joystick;/* Function prototypes *//* * Count the number of joysticks attached to the system */extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);/* * 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. */extern DECLSPEC const char * SDLCALL SDL_JoystickName(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 the value which will * identify this joystick in future joystick events. * * This function returns a joystick identifier, or NULL if an error occurred. */extern DECLSPEC SDL_Joystick * SDLCALL SDL_JoystickOpen(int device_index);/* * Returns 1 if the joystick has been opened, or 0 if it has not. */extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index);/* * Get the device index of an opened joystick. */extern DECLSPEC int SDLCALL SDL_JoystickIndex(SDL_Joystick *joystick);/* * Get the number of general axis controls on a joystick */extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(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. */extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick *joystick);/* * Get the number of POV hats on a joystick */extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick *joystick);/* * Get the number of buttons on a joystick */extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick *joystick);/* * Update the current state of the open joysticks. * This is called automatically by the event loop if any joystick * events are enabled. */extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);/* * 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. */extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state);/* * 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. */extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis);/* * Get the current state of a POV hat on a joystick * The return value is one of the following 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)/* * The hat indices start at index 0. */extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick *joystick, int hat);/* * Get the ball axis change since the last poll * This returns 0, or -1 if you passed it invalid parameters. * The ball indices start at index 0. */extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);/* * Get the current state of a button on a joystick * The button indices start at index 0. */extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick *joystick, int button);/* * Close a joystick previously opened with SDL_JoystickOpen() */extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick *joystick);/* Ends C function definitions when using C++ */#ifdef __cplusplus}#endif#include "close_code.h"#endif /* _SDL_joystick_h */