src/joystick/iphoneos/SDL_sysjoystick.m
author Sam Lantinga <slouken@libsdl.org>
Tue, 27 Nov 2012 00:58:12 -0800
changeset 6707 70eeb7e3ec2f
parent 6698 28ab2ef7bfc9
child 6744 4ac2bb6dc80c
permissions -rwxr-xr-x
Organized joystick hotplug code a bit.
Cleaned up names, return types, etc.
     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 int SDL_SYS_NumJoysticks()
    44 {
    45     return 1;
    46 }
    47 
    48 void SDL_SYS_JoystickDetect()
    49 {
    50 }
    51 
    52 SDL_bool SDL_SYS_JoystickNeedsPolling()
    53 {
    54     return SDL_FALSE;
    55 }
    56 
    57 /* Function to get the device-dependent name of a joystick */
    58 const char *
    59 SDL_SYS_JoystickNameForDeviceIndex(int device_index)
    60 {
    61     return accelerometerName;
    62 }
    63 
    64 /* Function to perform the mapping from device index to the instance id for this index */
    65 SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
    66 {
    67     return device_index;
    68 }
    69 
    70 /* Function to open a joystick for use.
    71    The joystick to open is specified by the index field of the joystick.
    72    This should fill the nbuttons and naxes fields of the joystick structure.
    73    It returns 0, or -1 if there is an error.
    74  */
    75 int
    76 SDL_SYS_JoystickOpen(SDL_Joystick * joystick, int device_index)
    77 {
    78     joystick->naxes = 3;
    79     joystick->nhats = 0;
    80     joystick->nballs = 0;
    81     joystick->nbuttons = 0;
    82     [[SDLUIAccelerationDelegate sharedDelegate] startup];
    83     return 0;
    84 }
    85 
    86 /* Function to determine is this joystick is attached to the system right now */
    87 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
    88 {
    89     return SDL_TRUE;
    90 }
    91 
    92 /* Function to update the state of a joystick - called as a device poll.
    93  * This function shouldn't update the joystick structure directly,
    94  * but instead should call SDL_PrivateJoystick*() to deliver events
    95  * and update joystick device state.
    96  */
    97 void
    98 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
    99 {
   100 	
   101 	Sint16 orientation[3];
   102 	
   103 	if ([[SDLUIAccelerationDelegate sharedDelegate] hasNewData]) {
   104 	
   105 		[[SDLUIAccelerationDelegate sharedDelegate] getLastOrientation: orientation];
   106 		[[SDLUIAccelerationDelegate sharedDelegate] setHasNewData: NO];
   107 		
   108 		SDL_PrivateJoystickAxis(joystick, 0, orientation[0]);
   109 		SDL_PrivateJoystickAxis(joystick, 1, orientation[1]);
   110 		SDL_PrivateJoystickAxis(joystick, 2, orientation[2]);
   111 
   112 	}
   113 	
   114     return;
   115 }
   116 
   117 /* Function to close a joystick after use */
   118 void
   119 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
   120 {
   121 	if ([[SDLUIAccelerationDelegate sharedDelegate] isRunning]) {
   122 		[[SDLUIAccelerationDelegate sharedDelegate] shutdown];
   123 	}
   124 	SDL_SetError("No joystick open with that index");
   125 
   126     return;
   127 }
   128 
   129 /* Function to perform any system-specific joystick related cleanup */
   130 void
   131 SDL_SYS_JoystickQuit(void)
   132 {
   133     return;
   134 }
   135 
   136 JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
   137 {
   138     JoystickGUID guid;
   139     // the GUID is just the first 16 chars of the name for now
   140     const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
   141     SDL_zero( guid );
   142     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   143     return guid;
   144 }
   145 
   146 JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
   147 {
   148     JoystickGUID guid;
   149     // the GUID is just the first 16 chars of the name for now
   150     const char *name = joystick->name;
   151     SDL_zero( guid );
   152     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   153     return guid;
   154 }
   155 
   156 /* vi: set ts=4 sw=4 expandtab: */