author  Sam Lantinga <slouken@libsdl.org> 
Mon, 19 Oct 2009 13:31:58 +0000  
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parent 2859  99210400e8b9 
child 3697  f7b03b6838cb 
permissions  rwrr 
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/* 
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SDL  Simple DirectMedia Layer 

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Copyright (C) 19972009 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 021101301 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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/* *INDENTOFF* */ 
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extern "C" { 
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/* *INDENTON* */ 
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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_RIGHTSDL_HAT_UP) 

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#define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHTSDL_HAT_DOWN) 

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#define SDL_HAT_LEFTUP (SDL_HAT_LEFTSDL_HAT_UP) 

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#define SDL_HAT_LEFTDOWN (SDL_HAT_LEFTSDL_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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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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/* *INDENTOFF* */ 
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} 
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/* *INDENTON* */ 
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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: */ 