src/joystick/iphoneos/SDL_sysjoystick.m
author Sam Lantinga <slouken@libsdl.org>
Mon, 08 Dec 2008 00:27:32 +0000
changeset 2859 99210400e8b9
parent 2765 f55c87ae336b
child 5262 b530ef003506
permissions -rw-r--r--
Updated copyright date
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 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     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* This is the system specific header for the SDL joystick API */
    25 
    26 #include "SDL_joystick.h"
    27 #include "../SDL_sysjoystick.h"
    28 #include "../SDL_joystick_c.h"
    29 #import "SDLUIAccelerationDelegate.h"
    30 
    31 const char *accelerometerName = "iPhone accelerometer";
    32 
    33 /* Function to scan the system for joysticks.
    34  * This function should set SDL_numjoysticks to the number of available
    35  * joysticks.  Joystick 0 should be the system default joystick.
    36  * It should return 0, or -1 on an unrecoverable fatal error.
    37  */
    38 int
    39 SDL_SYS_JoystickInit(void)
    40 {
    41     SDL_numjoysticks = 1;
    42     return (1);
    43 }
    44 
    45 /* Function to get the device-dependent name of a joystick */
    46 const char *
    47 SDL_SYS_JoystickName(int index)
    48 {
    49 	switch(index) {
    50 		case 0:
    51 			return accelerometerName;
    52 		default:
    53 			SDL_SetError("No joystick available with that index");
    54 			return NULL;
    55 	}
    56 }
    57 
    58 /* Function to open a joystick for use.
    59    The joystick to open is specified by the index field of the joystick.
    60    This should fill the nbuttons and naxes fields of the joystick structure.
    61    It returns 0, or -1 if there is an error.
    62  */
    63 int
    64 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
    65 {
    66 	if (joystick->index == 0) {
    67 		joystick->naxes = 3;
    68 		joystick->nhats = 0;
    69 		joystick->nballs = 0;
    70 		joystick->nbuttons = 0;
    71 		joystick->name  = accelerometerName;
    72 		[[SDLUIAccelerationDelegate sharedDelegate] startup];
    73 		return 0;
    74 	}
    75 	else {
    76 		SDL_SetError("No joystick available with that index");
    77 		return (-1);
    78 	}
    79 	
    80 }
    81 
    82 /* Function to update the state of a joystick - called as a device poll.
    83  * This function shouldn't update the joystick structure directly,
    84  * but instead should call SDL_PrivateJoystick*() to deliver events
    85  * and update joystick device state.
    86  */
    87 void
    88 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
    89 {
    90 	
    91 	Sint16 orientation[3];
    92 	
    93 	if ([[SDLUIAccelerationDelegate sharedDelegate] hasNewData]) {
    94 	
    95 		[[SDLUIAccelerationDelegate sharedDelegate] getLastOrientation: orientation];
    96 		[[SDLUIAccelerationDelegate sharedDelegate] setHasNewData: NO];
    97 		
    98 		SDL_PrivateJoystickAxis(joystick, 0, orientation[0]);
    99 		SDL_PrivateJoystickAxis(joystick, 1, orientation[1]);
   100 		SDL_PrivateJoystickAxis(joystick, 2, orientation[2]);
   101 
   102 	}
   103 	
   104     return;
   105 }
   106 
   107 /* Function to close a joystick after use */
   108 void
   109 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
   110 {
   111 	if (joystick->index == 0 && [[SDLUIAccelerationDelegate sharedDelegate] isRunning]) {
   112 		[[SDLUIAccelerationDelegate sharedDelegate] shutdown];
   113 	}
   114 	SDL_SetError("No joystick open with that index");
   115 
   116     return;
   117 }
   118 
   119 /* Function to perform any system-specific joystick related cleanup */
   120 void
   121 SDL_SYS_JoystickQuit(void)
   122 {
   123     return;
   124 }
   125 /* vi: set ts=4 sw=4 expandtab: */