src/libgame/joystick.c

   1 /***********************************************************
   2 * Artsoft Retro-Game Library                               *
   3 *----------------------------------------------------------*
   4 * (c) 1995-2006 Artsoft Entertainment                      *
   5 *               Holger Schemel                             *
   6 *               Detmolder Strasse 189                      *
   7 *               33604 Bielefeld                            *
   8 *               Germany                                    *
   9 *               e-mail: info@artsoft.org                   *
  10 *----------------------------------------------------------*
  11 * joystick.c                                               *
  12 ***********************************************************/
  13
  14 #if defined(PLATFORM_FREEBSD)
  15 #include <machine/joystick.h>
  16 #endif
  17
  18 #include "joystick.h"
  19 #include "misc.h"
  20
  21
  22 /* ========================================================================= */
  23 /* platform dependent joystick functions                                     */
  24 /* ========================================================================= */
  25
  26 #if defined(PLATFORM_UNIX) && !defined(TARGET_SDL)
  27 void UnixInitJoysticks()
  28 {
  29   static boolean unix_joystick_subsystem_initialized = FALSE;
  30   boolean print_warning = !unix_joystick_subsystem_initialized;
  31   int i;
  32
  33   for (i = 0; i < MAX_PLAYERS; i++)
  34   {
  35     char *device_name = setup.input[i].joy.device_name;
  36
  37     /* this allows subsequent calls to 'InitJoysticks' for re-initialization */
  38     if (joystick.fd[i] != -1)
  39     {
  40       close(joystick.fd[i]);
  41       joystick.fd[i] = -1;
  42     }
  43
  44     if (!setup.input[i].use_joystick)
  45       continue;
  46
  47     if (access(device_name, R_OK) != 0)
  48     {
  49       if (print_warning)
  50         Error(ERR_WARN, "cannot access joystick device '%s'", device_name);
  51
  52       continue;
  53     }
  54
  55     if ((joystick.fd[i] = open(device_name, O_RDONLY)) < 0)
  56     {
  57       if (print_warning)
  58         Error(ERR_WARN, "cannot open joystick device '%s'", device_name);
  59
  60       continue;
  61     }
  62
  63     joystick.status = JOYSTICK_ACTIVATED;
  64   }
  65
  66   unix_joystick_subsystem_initialized = TRUE;
  67 }
  68
  69 boolean UnixReadJoystick(int fd, int *x, int *y, boolean *b1, boolean *b2)
  70 {
  71 #if defined(PLATFORM_FREEBSD)
  72   struct joystick joy_ctrl;
  73 #else
  74   struct joystick_control
  75   {
  76     int buttons;
  77     int x;
  78     int y;
  79   } joy_ctrl;
  80 #endif
  81
  82   if (read(fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
  83     return FALSE;
  84
  85   if (x != NULL)
  86     *x = joy_ctrl.x;
  87   if (y != NULL)
  88     *y = joy_ctrl.y;
  89
  90 #if defined(PLATFORM_FREEBSD)
  91   if (b1 != NULL)
  92     *b1 = joy_ctrl.b1;
  93   if (b2 != NULL)
  94     *b2 = joy_ctrl.b2;
  95 #else
  96   if (b1 != NULL)
  97     *b1 = joy_ctrl.buttons & 1;
  98   if (b2 != NULL)
  99     *b2 = joy_ctrl.buttons & 2;
 100 #endif
 101
 102   return TRUE;
 103 }
 104 #endif /* PLATFORM_UNIX && !TARGET_SDL */
 105
 106
 107 /* ========================================================================= */
 108 /* platform independent joystick functions                                   */
 109 /* ========================================================================= */
 110
 111 #define TRANSLATE_JOYSYMBOL_TO_JOYNAME  0
 112 #define TRANSLATE_JOYNAME_TO_JOYSYMBOL  1
 113
 114 void translate_joyname(int *joysymbol, char **name, int mode)
 115 {
 116   static struct
 117   {
 118     int joysymbol;
 119     char *name;
 120   } translate_joy[] =
 121   {
 122     { JOY_LEFT,         "joystick_left" },
 123     { JOY_RIGHT,        "joystick_right" },
 124     { JOY_UP,           "joystick_up" },
 125     { JOY_DOWN,         "joystick_down" },
 126     { JOY_BUTTON_1,     "joystick_button_1" },
 127     { JOY_BUTTON_2,     "joystick_button_2" },
 128   };
 129
 130   int i;
 131
 132   if (mode == TRANSLATE_JOYSYMBOL_TO_JOYNAME)
 133   {
 134     *name = "[undefined]";
 135
 136     for (i = 0; i < 6; i++)
 137     {
 138       if (*joysymbol == translate_joy[i].joysymbol)
 139       {
 140         *name = translate_joy[i].name;
 141         break;
 142       }
 143     }
 144   }
 145   else if (mode == TRANSLATE_JOYNAME_TO_JOYSYMBOL)
 146   {
 147     *joysymbol = 0;
 148
 149     for (i = 0; i < 6; i++)
 150     {
 151       if (strEqual(*name, translate_joy[i].name))
 152       {
 153         *joysymbol = translate_joy[i].joysymbol;
 154         break;
 155       }
 156     }
 157   }
 158 }
 159
 160 char *getJoyNameFromJoySymbol(int joysymbol)
 161 {
 162   char *name;
 163
 164   translate_joyname(&joysymbol, &name, TRANSLATE_JOYSYMBOL_TO_JOYNAME);
 165   return name;
 166 }
 167
 168 int getJoySymbolFromJoyName(char *name)
 169 {
 170   int joysymbol;
 171
 172   translate_joyname(&joysymbol, &name, TRANSLATE_JOYNAME_TO_JOYSYMBOL);
 173   return joysymbol;
 174 }
 175
 176 int getJoystickNrFromDeviceName(char *device_name)
 177 {
 178   char c;
 179   int joystick_nr = 0;
 180
 181   if (device_name == NULL || device_name[0] == '\0')
 182     return 0;
 183
 184   c = device_name[strlen(device_name) - 1];
 185
 186   if (c >= '0' && c <= '9')
 187     joystick_nr = (int)(c - '0');
 188
 189   if (joystick_nr < 0 || joystick_nr >= MAX_PLAYERS)
 190     joystick_nr = 0;
 191
 192   return joystick_nr;
 193 }
 194
 195 char *getDeviceNameFromJoystickNr(int joystick_nr)
 196 {
 197   static char *joystick_device_name[MAX_PLAYERS] =
 198   {
 199     DEV_JOYSTICK_0,
 200     DEV_JOYSTICK_1,
 201     DEV_JOYSTICK_2,
 202     DEV_JOYSTICK_3
 203   };
 204
 205   return (joystick_nr >= 0 && joystick_nr <= 3 ?
 206           joystick_device_name[joystick_nr] : "");
 207 }
 208
 209 static int JoystickPositionPercent(int center, int border, int actual)
 210 {
 211   long range, position;
 212   int percent;
 213
 214   if (border < center && actual > center)
 215     return 0;
 216   if (border > center && actual < center)
 217     return 0;
 218
 219   range = ABS(border - center);
 220   position = ABS(actual - center);
 221
 222   percent = (int)(position * 100 / range);
 223
 224   if (percent > 100)
 225     percent = 100;
 226
 227   return percent;
 228 }
 229
 230 void CheckJoystickData()
 231 {
 232   int i;
 233   int distance = 100;
 234
 235   for (i = 0; i < MAX_PLAYERS; i++)
 236   {
 237     if (setup.input[i].joy.xleft >= setup.input[i].joy.xmiddle)
 238       setup.input[i].joy.xleft = setup.input[i].joy.xmiddle - distance;
 239     if (setup.input[i].joy.xright <= setup.input[i].joy.xmiddle)
 240       setup.input[i].joy.xright = setup.input[i].joy.xmiddle + distance;
 241
 242     if (setup.input[i].joy.yupper >= setup.input[i].joy.ymiddle)
 243       setup.input[i].joy.yupper = setup.input[i].joy.ymiddle - distance;
 244     if (setup.input[i].joy.ylower <= setup.input[i].joy.ymiddle)
 245       setup.input[i].joy.ylower = setup.input[i].joy.ymiddle + distance;
 246   }
 247 }
 248
 249 int Joystick(int player_nr)
 250 {
 251   int joystick_fd = joystick.fd[player_nr];
 252   int js_x, js_y;
 253   boolean js_b1, js_b2;
 254   int left, right, up, down;
 255   int result = JOY_NO_ACTION;
 256
 257   if (joystick.status != JOYSTICK_ACTIVATED)
 258     return JOY_NO_ACTION;
 259
 260   if (joystick_fd < 0 || !setup.input[player_nr].use_joystick)
 261     return JOY_NO_ACTION;
 262
 263   if (!ReadJoystick(joystick_fd, &js_x, &js_y, &js_b1, &js_b2))
 264   {
 265     Error(ERR_WARN, "cannot read joystick device '%s'",
 266           setup.input[player_nr].joy.device_name);
 267
 268     joystick.status = JOYSTICK_NOT_AVAILABLE;
 269     return JOY_NO_ACTION;
 270   }
 271
 272   left  = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
 273                                   setup.input[player_nr].joy.xleft,  js_x);
 274   right = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
 275                                   setup.input[player_nr].joy.xright, js_x);
 276   up    = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
 277                                   setup.input[player_nr].joy.yupper, js_y);
 278   down  = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
 279                                   setup.input[player_nr].joy.ylower, js_y);
 280
 281   if (left > JOYSTICK_PERCENT)
 282     result |= JOY_LEFT;
 283   else if (right > JOYSTICK_PERCENT)
 284     result |= JOY_RIGHT;
 285   if (up > JOYSTICK_PERCENT)
 286     result |= JOY_UP;
 287   else if (down > JOYSTICK_PERCENT)
 288     result |= JOY_DOWN;
 289
 290   if (js_b1)
 291     result |= JOY_BUTTON_1;
 292   if (js_b2)
 293     result |= JOY_BUTTON_2;
 294
 295   return result;
 296 }
 297
 298 int JoystickButton(int player_nr)
 299 {
 300   static int last_joy_button[MAX_PLAYERS] = { 0, 0, 0, 0 };
 301   int joy_button = (Joystick(player_nr) & JOY_BUTTON);
 302   int result;
 303
 304   if (joy_button)
 305   {
 306     if (last_joy_button[player_nr])
 307       result = JOY_BUTTON_PRESSED;
 308     else
 309       result = JOY_BUTTON_NEW_PRESSED;
 310   }
 311   else
 312   {
 313     if (last_joy_button[player_nr])
 314       result = JOY_BUTTON_NEW_RELEASED;
 315     else
 316       result = JOY_BUTTON_NOT_PRESSED;
 317   }
 318
 319   last_joy_button[player_nr] = joy_button;
 320   return result;
 321 }
 322
 323 int AnyJoystick()
 324 {
 325   int i;
 326   int result = 0;
 327
 328   for (i = 0; i < MAX_PLAYERS; i++)
 329     result |= Joystick(i);
 330
 331   return result;
 332 }
 333
 334 int AnyJoystickButton()
 335 {
 336   int i;
 337   int result = JOY_BUTTON_NOT_PRESSED;
 338
 339   for (i = 0; i < MAX_PLAYERS; i++)
 340   {
 341     result = JoystickButton(i);
 342     if (result != JOY_BUTTON_NOT_PRESSED)
 343       break;
 344   }
 345
 346   return result;
 347 }
 348
 349 void DeactivateJoystick()
 350 {
 351   /* Temporarily deactivate joystick. This is needed for calibration
 352      screens, where the player has to select a joystick device that
 353      should be calibrated. If there is a totally uncalibrated joystick
 354      active, it may be impossible (due to messed up input from joystick)
 355      to select the joystick device to calibrate even when trying to use
 356      the mouse or keyboard to select the device. */
 357
 358   if (joystick.status & JOYSTICK_AVAILABLE)
 359     joystick.status &= ~JOYSTICK_ACTIVE;
 360 }
 361
 362 void ActivateJoystick()
 363 {
 364   /* reactivate temporarily deactivated joystick */
 365
 366   if (joystick.status & JOYSTICK_AVAILABLE)
 367     joystick.status |= JOYSTICK_ACTIVE;
 368 }