src/joystick/psp/SDL_sysjoystick.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 15 Apr 2015 21:29:55 +0200
changeset 9561 d8ad01792399
parent 9433 bd062398b648
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fixed typo in internal joystick documentation comments.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 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_internal.h"
    22 
    23 #if SDL_JOYSTICK_PSP
    24 
    25 /* This is the PSP implementation of the SDL joystick API */
    26 #include <pspctrl.h>
    27 #include <pspkernel.h>
    28 
    29 #include <stdio.h>      /* For the definition of NULL */
    30 #include <stdlib.h>
    31 
    32 #include "../SDL_sysjoystick.h"
    33 #include "../SDL_joystick_c.h"
    34 
    35 #include "SDL_events.h"
    36 #include "SDL_error.h"
    37 #include "SDL_thread.h"
    38 #include "SDL_mutex.h"
    39 #include "SDL_timer.h"
    40 
    41 /* Current pad state */
    42 static SceCtrlData pad = { .Lx = 0, .Ly = 0, .Buttons = 0 };
    43 static SDL_sem *pad_sem = NULL;
    44 static SDL_Thread *thread = NULL;
    45 static int running = 0;
    46 static const enum PspCtrlButtons button_map[] = {
    47     PSP_CTRL_TRIANGLE, PSP_CTRL_CIRCLE, PSP_CTRL_CROSS, PSP_CTRL_SQUARE,
    48     PSP_CTRL_LTRIGGER, PSP_CTRL_RTRIGGER,
    49     PSP_CTRL_DOWN, PSP_CTRL_LEFT, PSP_CTRL_UP, PSP_CTRL_RIGHT,
    50     PSP_CTRL_SELECT, PSP_CTRL_START, PSP_CTRL_HOME, PSP_CTRL_HOLD };
    51 static int analog_map[256];  /* Map analog inputs to -32768 -> 32767 */
    52 
    53 typedef struct
    54 {
    55   int x;
    56   int y;
    57 } point;
    58 
    59 /* 4 points define the bezier-curve. */
    60 static point a = { 0, 0 };
    61 static point b = { 50, 0  };
    62 static point c = { 78, 32767 };
    63 static point d = { 128, 32767 };
    64 
    65 /* simple linear interpolation between two points */
    66 static SDL_INLINE void lerp (point *dest, point *a, point *b, float t)
    67 {
    68     dest->x = a->x + (b->x - a->x)*t;
    69     dest->y = a->y + (b->y - a->y)*t;
    70 }
    71 
    72 /* evaluate a point on a bezier-curve. t goes from 0 to 1.0 */
    73 static int calc_bezier_y(float t)
    74 {
    75     point ab, bc, cd, abbc, bccd, dest;
    76     lerp (&ab, &a, &b, t);           /* point between a and b */
    77     lerp (&bc, &b, &c, t);           /* point between b and c */
    78     lerp (&cd, &c, &d, t);           /* point between c and d */
    79     lerp (&abbc, &ab, &bc, t);       /* point between ab and bc */
    80     lerp (&bccd, &bc, &cd, t);       /* point between bc and cd */
    81     lerp (&dest, &abbc, &bccd, t);   /* point on the bezier-curve */
    82     return dest.y;
    83 }
    84 
    85 /*
    86  * Collect pad data about once per frame
    87  */
    88 int JoystickUpdate(void *data)
    89 {
    90     while (running) {
    91         SDL_SemWait(pad_sem);
    92         sceCtrlPeekBufferPositive(&pad, 1);
    93         SDL_SemPost(pad_sem);
    94         /* Delay 1/60th of a second */
    95         sceKernelDelayThread(1000000 / 60);
    96     }
    97     return 0;
    98 }
    99 
   100 
   101 
   102 /* Function to scan the system for joysticks.
   103  * Joystick 0 should be the system default joystick.
   104  * It should return number of joysticks, or -1 on an unrecoverable fatal error.
   105  */
   106 int SDL_SYS_JoystickInit(void)
   107 {
   108     int i;
   109 
   110     /* Setup input */
   111     sceCtrlSetSamplingCycle(0);
   112     sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);
   113 
   114     /* Start thread to read data */
   115     if((pad_sem =  SDL_CreateSemaphore(1)) == NULL) {
   116         return SDL_SetError("Can't create input semaphore");
   117     }
   118     running = 1;
   119     if((thread = SDL_CreateThread(JoystickUpdate, "JoySitckThread",NULL)) == NULL) {
   120         return SDL_SetError("Can't create input thread");
   121     }
   122 
   123     /* Create an accurate map from analog inputs (0 to 255)
   124        to SDL joystick positions (-32768 to 32767) */
   125     for (i = 0; i < 128; i++)
   126     {
   127         float t = (float)i/127.0f;
   128         analog_map[i+128] = calc_bezier_y(t);
   129         analog_map[127-i] = -1 * analog_map[i+128];
   130     }
   131 
   132     return 1;
   133 }
   134 
   135 int SDL_SYS_NumJoysticks()
   136 {
   137     return 1;
   138 }
   139 
   140 void SDL_SYS_JoystickDetect()
   141 {
   142 }
   143 
   144 /* Function to get the device-dependent name of a joystick */
   145 const char * SDL_SYS_JoystickNameForDeviceIndex(int device_index)
   146 {
   147     return "PSP builtin joypad";
   148 }
   149 
   150 /* Function to perform the mapping from device index to the instance id for this index */
   151 SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
   152 {
   153     return device_index;
   154 }
   155 
   156 /* Function to get the device-dependent name of a joystick */
   157 const char *SDL_SYS_JoystickName(int index)
   158 {
   159     if (index == 0)
   160         return "PSP controller";
   161 
   162     SDL_SetError("No joystick available with that index");
   163     return(NULL);
   164 }
   165 
   166 /* Function to open a joystick for use.
   167    The joystick to open is specified by the device index.
   168    This should fill the nbuttons and naxes fields of the joystick structure.
   169    It returns 0, or -1 if there is an error.
   170  */
   171 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick, int device_index)
   172 {
   173     joystick->nbuttons = 14;
   174     joystick->naxes = 2;
   175     joystick->nhats = 0;
   176 
   177     return 0;
   178 }
   179 
   180 /* Function to determine if this joystick is attached to the system right now */
   181 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
   182 {
   183     return SDL_TRUE;
   184 }
   185 
   186 /* Function to update the state of a joystick - called as a device poll.
   187  * This function shouldn't update the joystick structure directly,
   188  * but instead should call SDL_PrivateJoystick*() to deliver events
   189  * and update joystick device state.
   190  */
   191 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
   192 {
   193     int i;
   194     enum PspCtrlButtons buttons;
   195     enum PspCtrlButtons changed;
   196     unsigned char x, y;
   197     static enum PspCtrlButtons old_buttons = 0;
   198     static unsigned char old_x = 0, old_y = 0;
   199 
   200     SDL_SemWait(pad_sem);
   201     buttons = pad.Buttons;
   202     x = pad.Lx;
   203     y = pad.Ly;
   204     SDL_SemPost(pad_sem);
   205 
   206     /* Axes */
   207     if(old_x != x) {
   208         SDL_PrivateJoystickAxis(joystick, 0, analog_map[x]);
   209         old_x = x;
   210     }
   211     if(old_y != y) {
   212         SDL_PrivateJoystickAxis(joystick, 1, analog_map[y]);
   213         old_y = y;
   214     }
   215 
   216     /* Buttons */
   217     changed = old_buttons ^ buttons;
   218     old_buttons = buttons;
   219     if(changed) {
   220         for(i=0; i<sizeof(button_map)/sizeof(button_map[0]); i++) {
   221             if(changed & button_map[i]) {
   222                 SDL_PrivateJoystickButton(
   223                     joystick, i,
   224                     (buttons & button_map[i]) ?
   225                     SDL_PRESSED : SDL_RELEASED);
   226             }
   227         }
   228     }
   229 
   230     sceKernelDelayThread(0);
   231 }
   232 
   233 /* Function to close a joystick after use */
   234 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
   235 {
   236 }
   237 
   238 /* Function to perform any system-specific joystick related cleanup */
   239 void SDL_SYS_JoystickQuit(void)
   240 {
   241     /* Cleanup Threads and Semaphore. */
   242     running = 0;
   243     SDL_WaitThread(thread, NULL);
   244     SDL_DestroySemaphore(pad_sem);
   245 }
   246 
   247 SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
   248 {
   249     SDL_JoystickGUID guid;
   250     /* the GUID is just the first 16 chars of the name for now */
   251     const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
   252     SDL_zero( guid );
   253     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   254     return guid;
   255 }
   256 
   257 SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
   258 {
   259     SDL_JoystickGUID guid;
   260     /* the GUID is just the first 16 chars of the name for now */
   261     const char *name = joystick->name;
   262     SDL_zero( guid );
   263     SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
   264     return guid;
   265 }
   266 
   267 #endif /* SDL_JOYSTICK_PSP */
   268 
   269 /* vim: ts=4 sw=4
   270  */