src/joystick/iphoneos/SDL_sysjoystick.m
author Sam Lantinga <slouken@libsdl.org>
Mon, 26 Nov 2012 22:27:49 -0800
changeset 6698 28ab2ef7bfc9
parent 6693 3c98e4ec2180
child 6707 70eeb7e3ec2f
permissions -rwxr-xr-x
Completed adding new hotplug stubs for the joystick implementations
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 /* This is the system specific header for the SDL joystick API */
    24 
    25 #include "SDL_joystick.h"
    26 #include "../SDL_sysjoystick.h"
    27 #include "../SDL_joystick_c.h"
    28 #import "SDLUIAccelerationDelegate.h"
    29 
    30 const char *accelerometerName = "iPhone accelerometer";
    31 
    32 /* Function to scan the system for joysticks.
    33  * This function should set SDL_numjoysticks to the number of available
    34  * joysticks.  Joystick 0 should be the system default joystick.
    35  * It should return 0, or -1 on an unrecoverable fatal error.
    36  */
    37 int
    38 SDL_SYS_JoystickInit(void)
    39 {
    40     return (1);
    41 }
    42 
    43 /* Function to get the device-dependent name of a joystick */
    44 const char *
    45 SDL_SYS_JoystickNameForIndex(int index)
    46 {
    47 	switch(index) {
    48 		case 0:
    49 			return accelerometerName;
    50 		default:
    51 			SDL_SetError("No joystick available with that index");
    52 			return NULL;
    53 	}
    54 }
    55 
    56 /* Function to open a joystick for use.
    57    The joystick to open is specified by the index field of the joystick.
    58    This should fill the nbuttons and naxes fields of the joystick structure.
    59    It returns 0, or -1 if there is an error.
    60  */
    61 int
    62 SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
    63 {
    64 	if (device_index == 0) {
    65 		joystick->naxes = 3;
    66 		joystick->nhats = 0;
    67 		joystick->nballs = 0;
    68 		joystick->nbuttons = 0;
    69 		[[SDLUIAccelerationDelegate sharedDelegate] startup];
    70 		return 0;
    71 	} else {
    72 		SDL_SetError("No joystick available with that index");
    73 		return (-1);
    74 	}
    75 }
    76 
    77 /* Function to update the state of a joystick - called as a device poll.
    78  * This function shouldn't update the joystick structure directly,
    79  * but instead should call SDL_PrivateJoystick*() to deliver events
    80  * and update joystick device state.
    81  */
    82 void
    83 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
    84 {
    85 	
    86 	Sint16 orientation[3];
    87 	
    88 	if ([[SDLUIAccelerationDelegate sharedDelegate] hasNewData]) {
    89 	
    90 		[[SDLUIAccelerationDelegate sharedDelegate] getLastOrientation: orientation];
    91 		[[SDLUIAccelerationDelegate sharedDelegate] setHasNewData: NO];
    92 		
    93 		SDL_PrivateJoystickAxis(joystick, 0, orientation[0]);
    94 		SDL_PrivateJoystickAxis(joystick, 1, orientation[1]);
    95 		SDL_PrivateJoystickAxis(joystick, 2, orientation[2]);
    96 
    97 	}
    98 	
    99     return;
   100 }
   101 
   102 /* Function to close a joystick after use */
   103 void
   104 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
   105 {
   106 	if ([[SDLUIAccelerationDelegate sharedDelegate] isRunning]) {
   107 		[[SDLUIAccelerationDelegate sharedDelegate] shutdown];
   108 	}
   109 	SDL_SetError("No joystick open with that index");
   110 
   111     return;
   112 }
   113 
   114 /* Function to perform any system-specific joystick related cleanup */
   115 void
   116 SDL_SYS_JoystickQuit(void)
   117 {
   118     return;
   119 }
   120 
   121 /* Function to perform the mapping from device index to the instance id for this index */
   122 SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int index)
   123 {
   124     return index;
   125 }
   126 
   127 /* Function to determine is this joystick is attached to the system right now */
   128 int SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
   129 {
   130     return 1;
   131 }
   132 
   133 int SDL_SYS_NumJoysticks()
   134 {
   135     return 1;
   136 }
   137 
   138 int SDL_SYS_JoystickNeedsPolling()
   139 {
   140     return 0;
   141 }
   142 
   143 void SDL_SYS_JoystickDetect()
   144 {
   145 }
   146 
   147 JoystickGUID SDL_SYS_PrivateJoystickGetDeviceGUID( int device_index )
   148 {
   149     JoystickGUID guid;
   150     // the GUID is just the first 16 chars of the name for now
   151     const char *name = SDL_SYS_JoystickNameForIndex( device_index );
   152     SDL_zero( guid );
   153     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   154     return guid;
   155 }
   156 
   157 JoystickGUID SDL_SYS_PrivateJoystickGetGUID(SDL_Joystick * joystick)
   158 {
   159     JoystickGUID guid;
   160     // the GUID is just the first 16 chars of the name for now
   161     const char *name = joystick->name;
   162     SDL_zero( guid );
   163     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   164     return guid;
   165 }
   166 
   167 /* vi: set ts=4 sw=4 expandtab: */