SDL_joystick.h
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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,
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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*/
/* Include file for SDL joystick event handling */
#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
/* 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
*/
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extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
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/*
* 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.
*/
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extern DECLSPEC const char * SDLCALL SDL_JoystickName(int device_index);
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/*
* 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.
*/
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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
* 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.
* 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.
* 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.
*/
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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
* The state is a value ranging from -32768 to 32767.
* The axis indices start at index 0.
*/
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extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis);
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/*
* 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.
*/
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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
* This returns 0, or -1 if you passed it invalid parameters.
* The ball indices start at index 0.
*/
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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
* The button indices start at index 0.
*/
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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 */