include/SDL_joystick.h
author Ryan C. Gordon <icculus@icculus.org>
Mon, 11 Jan 2010 07:33:56 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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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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#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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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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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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/* Function prototypes */
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/**
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 *  Count the number of joysticks attached to the system
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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_JoystickName(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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 *  Returns 1 if the joystick has been opened, or 0 if it has not.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index);
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/**
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 *  Get the device index of an opened joystick.
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 */
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extern DECLSPEC int SDLCALL SDL_JoystickIndex(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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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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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: */