src/joystick/SDL_sysjoystick.h
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     1 /*
       
     2     SDL - Simple DirectMedia Layer
       
     3     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
       
     4 
       
     5     This library is free software; you can redistribute it and/or
       
     6     modify it under the terms of the GNU Library General Public
       
     7     License as published by the Free Software Foundation; either
       
     8     version 2 of the License, or (at your option) any later version.
       
     9 
       
    10     This library is distributed in the hope that it will be useful,
       
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
    13     Library General Public License for more details.
       
    14 
       
    15     You should have received a copy of the GNU Library General Public
       
    16     License along with this library; if not, write to the Free
       
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
       
    18 
       
    19     Sam Lantinga
       
    20     slouken@devolution.com
       
    21 */
       
    22 
       
    23 #ifdef SAVE_RCSID
       
    24 static char rcsid =
       
    25  "@(#) $Id$";
       
    26 #endif
       
    27 
       
    28 /* This is the system specific header for the SDL joystick API */
       
    29 
       
    30 #include "SDL_joystick.h"
       
    31 
       
    32 /* The SDL joystick structure */
       
    33 struct _SDL_Joystick {
       
    34 	Uint8 index;		/* Device index */
       
    35 	const char *name;	/* Joystick name - system dependent */
       
    36 
       
    37 	int naxes;		/* Number of axis controls on the joystick */
       
    38 	Sint16 *axes;		/* Current axis states */
       
    39 
       
    40 	int nhats;		/* Number of hats on the joystick */
       
    41 	Uint8 *hats;		/* Current hat states */
       
    42 	
       
    43 	int nballs;		/* Number of trackballs on the joystick */
       
    44 	struct balldelta {
       
    45 		int dx;
       
    46 		int dy;
       
    47 	} *balls;		/* Current ball motion deltas */
       
    48 	
       
    49 	int nbuttons;		/* Number of buttons on the joystick */
       
    50 	Uint8 *buttons;		/* Current button states */
       
    51 	
       
    52 	struct joystick_hwdata *hwdata;	/* Driver dependent information */
       
    53 
       
    54 	int ref_count;		/* Reference count for multiple opens */
       
    55 };
       
    56 
       
    57 /* Function to scan the system for joysticks.
       
    58  * Joystick 0 should be the system default joystick.
       
    59  * This function should return the number of available joysticks, or -1
       
    60  * on an unrecoverable fatal error.
       
    61  */
       
    62 extern int SDL_SYS_JoystickInit(void);
       
    63 
       
    64 /* Function to get the device-dependent name of a joystick */
       
    65 extern const char *SDL_SYS_JoystickName(int index);
       
    66 
       
    67 /* Function to open a joystick for use.
       
    68    The joystick to open is specified by the index field of the joystick.
       
    69    This should fill the nbuttons and naxes fields of the joystick structure.
       
    70    It returns 0, or -1 if there is an error.
       
    71  */
       
    72 extern int SDL_SYS_JoystickOpen(SDL_Joystick *joystick);
       
    73 
       
    74 /* Function to update the state of a joystick - called as a device poll.
       
    75  * This function shouldn't update the joystick structure directly,
       
    76  * but instead should call SDL_PrivateJoystick*() to deliver events
       
    77  * and update joystick device state.
       
    78  */
       
    79 extern void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick);
       
    80 
       
    81 /* Function to close a joystick after use */
       
    82 extern void SDL_SYS_JoystickClose(SDL_Joystick *joystick);
       
    83 
       
    84 /* Function to perform any system-specific joystick related cleanup */
       
    85 extern void SDL_SYS_JoystickQuit(void);
       
    86