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SDL_joystick.h
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
License along with this library; if not, write to the Free Software
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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#ifndef _SDL_joystick_h
#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"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
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/** @file SDL_joystick.h
* @note 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.
*/
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struct _SDL_Joystick;
typedef struct _SDL_Joystick SDL_Joystick;
/* Function prototypes */
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* Count the number of joysticks attached to the system
*/
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extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
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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.
* If no name can be found, this function returns NULL.
*/
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extern DECLSPEC const char * SDLCALL SDL_JoystickName(int device_index);
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/**
* Open a joystick for use.
*
* @param[in] device_index
* The index passed as an argument refers to
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* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
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* @return This function returns 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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* Returns 1 if the joystick has been opened, or 0 if it has not.
*/
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extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index);
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* Get the device index of an opened joystick.
*/
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extern DECLSPEC int SDLCALL SDL_JoystickIndex(SDL_Joystick *joystick);
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* Get the number of general axis controls on a joystick
*/
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extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick *joystick);
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* Get the number of trackballs on a joystick
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* Joystick trackballs have only relative motion events associated
* with them and their state cannot be polled.
*/
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extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick *joystick);
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* Get the number of POV hats on a joystick
*/
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extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick *joystick);
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* Get the number of buttons on a joystick
*/
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extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick *joystick);
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* Update the current state of the open joysticks.
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* This is called automatically by the event loop if any joystick
* events are enabled.
*/
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extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);
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* Enable/disable joystick event polling.
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* If joystick events are disabled, you must call SDL_JoystickUpdate()
* yourself and check the state of the joystick when you want joystick
* information.
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*
* @param[in] state 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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* Get the current state of an axis control on a joystick
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*
* @param[in] axis The axis indices start at index 0.
*
* @return The state is a value ranging from -32768 to 32767.
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*/
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extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis);
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/**
* @name Hat Positions
* The return value of SDL_JoystickGetHat() is one of the following positions:
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*/
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#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)
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/*@}*/
/**
* Get the current state of a POV hat on a joystick
*
* @param[in] hat The hat indices start at index 0.
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*/
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extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick *joystick, int hat);
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* Get the ball axis change since the last poll
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*
* @param[in] ball The ball indices start at index 0.
*
* @return This returns 0, or -1 if you passed it invalid parameters.
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*/
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extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);
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* Get the current state of a button on a joystick
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*/
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extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick *joystick, int button);
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* Close a joystick previously opened with SDL_JoystickOpen()
*/
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extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick *joystick);
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/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"
#endif /* _SDL_joystick_h */