src/joystick.c

   1 /***********************************************************
   2 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
   3 *----------------------------------------------------------*
   4 *  (c) 1995-98 Artsoft Entertainment                       *
   5 *              Holger Schemel                              *
   6 *              Oststrasse 11a                              *
   7 *              33604 Bielefeld                             *
   8 *              phone: ++49 +521 290471                     *
   9 *              email: aeglos@valinor.owl.de                *
  10 *----------------------------------------------------------*
  11 *  joystick.c                                              *
  12 ***********************************************************/
  13
  14 #ifdef __FreeBSD__
  15 #include <machine/joystick.h>
  16 #endif
  17
  18 #include "joystick.h"
  19 #include "misc.h"
  20
  21 #ifndef MSDOS
  22 static int JoystickPosition(int middle, int margin, int actual)
  23 {
  24   long range, pos;
  25   int percentage;
  26
  27   if (margin < middle && actual > middle)
  28     return 0;
  29   if (margin > middle && actual < middle)
  30     return 0;
  31
  32   range = ABS(margin - middle);
  33   pos = ABS(actual - middle);
  34   percentage = (int)(pos * 100 / range);
  35
  36   if (percentage > 100)
  37     percentage = 100;
  38
  39   return percentage;
  40 }
  41 #endif
  42
  43 #ifdef USE_SDL_JOYSTICK
  44
  45 static SDL_Joystick *sdl_joystick[MAX_PLAYERS] = { NULL, NULL, NULL, NULL };
  46 static int sdl_js_axis[MAX_PLAYERS][2]   = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
  47 static int sdl_js_button[MAX_PLAYERS][2] = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
  48
  49 SDL_Joystick *Get_SDL_Joystick(int nr)
  50 {
  51   return sdl_joystick[nr];
  52 }
  53
  54 boolean Open_SDL_Joystick(int nr)
  55 {
  56   if (nr < 0 || nr > MAX_PLAYERS)
  57     return FALSE;
  58
  59   return ((sdl_joystick[nr] = SDL_JoystickOpen(nr)) == NULL ? FALSE : TRUE);
  60 }
  61
  62 void Close_SDL_Joystick(int nr)
  63 {
  64   if (nr < 0 || nr > MAX_PLAYERS)
  65     return;
  66
  67   SDL_JoystickClose(sdl_joystick[nr]);
  68 }
  69
  70 boolean Check_SDL_JoystickOpened(int nr)
  71 {
  72   if (nr < 0 || nr > MAX_PLAYERS)
  73     return FALSE;
  74
  75   return (SDL_JoystickOpened(nr) ? TRUE : FALSE);
  76 }
  77
  78 void HandleJoystickEvent(Event *event)
  79 {
  80   switch(event->type)
  81   {
  82     case SDL_JOYAXISMOTION:
  83       if (event->jaxis.axis < 2)
  84       {
  85         sdl_js_axis[event->jaxis.which][event->jaxis.axis]= event->jaxis.value;
  86
  87 #if 0
  88         printf("js_%d %s-axis: %d\n",
  89                event->jaxis.which,
  90                (event->jaxis.axis == 0 ? "x" : "y"),
  91                event->jaxis.value);
  92 #endif
  93       }
  94       break;
  95
  96     case SDL_JOYBUTTONDOWN:
  97       if (event->jbutton.button < 2)
  98       {
  99         sdl_js_button[event->jbutton.which][event->jbutton.button] = TRUE;
 100
 101 #if 0
 102         printf("js_%d button %d: pressed\n",
 103                event->jbutton.which,
 104                event->jbutton.button);
 105 #endif
 106       }
 107       break;
 108
 109     case SDL_JOYBUTTONUP:
 110       if (event->jbutton.button < 2)
 111       {
 112         sdl_js_button[event->jbutton.which][event->jbutton.button] = FALSE;
 113
 114 #if 0
 115         printf("js_%d button %d: released\n",
 116                event->jbutton.which,
 117                event->jbutton.button);
 118 #endif
 119       }
 120       break;
 121
 122     default:
 123       break;
 124   }
 125 }
 126
 127 int Get_SDL_Joystick_Axis(int nr, int axis)
 128 {
 129   if (nr < 0 || nr > MAX_PLAYERS)
 130     return 0;
 131
 132   if (axis < 0 || axis > 1)
 133     return 0;
 134
 135   return sdl_js_axis[nr][axis];
 136 }
 137
 138 void CheckJoystickData()
 139 {
 140 }
 141
 142 int Joystick(int player_nr)
 143 {
 144   int joystick_nr = stored_player[player_nr].joystick_fd;
 145   int js_x,js_y, js_b1,js_b2;
 146   int left, right, up, down;
 147   int result = 0;
 148
 149   if (joystick_status == JOYSTICK_OFF)
 150     return 0;
 151
 152   if (game_status == SETUPINPUT)
 153     return 0;
 154
 155   if (!setup.input[player_nr].use_joystick ||
 156       !Check_SDL_JoystickOpened(joystick_nr))
 157     return 0;
 158
 159   js_x  = sdl_js_axis[joystick_nr][0];
 160   js_y  = sdl_js_axis[joystick_nr][1];
 161
 162   js_b1 = sdl_js_button[joystick_nr][0];
 163   js_b2 = sdl_js_button[joystick_nr][1];
 164
 165
 166
 167 #if 0
 168   printf("JOYSTICK %d: js_x == %d, js_y == %d, js_b1 == %d, js_b2 == %d\n",
 169          joystick_nr, js_x, js_y, js_b1, js_b2);
 170 #endif
 171
 172
 173
 174   left  = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 175                            setup.input[player_nr].joy.xleft,  js_x);
 176   right = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 177                            setup.input[player_nr].joy.xright, js_x);
 178   up    = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 179                            setup.input[player_nr].joy.yupper, js_y);
 180   down  = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 181                            setup.input[player_nr].joy.ylower, js_y);
 182
 183   if (left > JOYSTICK_PERCENT)
 184     result |= JOY_LEFT;
 185   else if (right > JOYSTICK_PERCENT)
 186     result |= JOY_RIGHT;
 187   if (up > JOYSTICK_PERCENT)
 188     result |= JOY_UP;
 189   else if (down > JOYSTICK_PERCENT)
 190     result |= JOY_DOWN;
 191
 192   if (js_b1)
 193     result |= JOY_BUTTON_1;
 194   if (js_b2)
 195     result |= JOY_BUTTON_2;
 196
 197
 198
 199 #if 0
 200   printf("result == 0x%08x\n", result);
 201 #endif
 202
 203
 204
 205   return result;
 206 }
 207
 208 #else /* !USE_SDL_JOYSTICK */
 209
 210 void CheckJoystickData()
 211 {
 212   int i;
 213   int distance = 100;
 214
 215   for(i=0; i<MAX_PLAYERS; i++)
 216   {
 217     if (setup.input[i].joy.xmiddle <= distance)
 218       setup.input[i].joy.xmiddle = distance;
 219     if (setup.input[i].joy.ymiddle <= distance)
 220       setup.input[i].joy.ymiddle = distance;
 221
 222     if (setup.input[i].joy.xleft >= setup.input[i].joy.xmiddle)
 223       setup.input[i].joy.xleft = setup.input[i].joy.xmiddle - distance;
 224     if (setup.input[i].joy.xright <= setup.input[i].joy.xmiddle)
 225       setup.input[i].joy.xright = setup.input[i].joy.xmiddle + distance;
 226
 227     if (setup.input[i].joy.yupper >= setup.input[i].joy.ymiddle)
 228       setup.input[i].joy.yupper = setup.input[i].joy.ymiddle - distance;
 229     if (setup.input[i].joy.ylower <= setup.input[i].joy.ymiddle)
 230       setup.input[i].joy.ylower = setup.input[i].joy.ymiddle + distance;
 231   }
 232 }
 233
 234 #ifndef MSDOS
 235 int Joystick(int player_nr)
 236 {
 237 #ifdef __FreeBSD__
 238   struct joystick joy_ctrl;
 239 #else
 240   struct joystick_control
 241   {
 242     int buttons;
 243     int x;
 244     int y;
 245   } joy_ctrl;
 246 #endif
 247
 248   int joystick_fd = stored_player[player_nr].joystick_fd;
 249   int js_x,js_y, js_b1,js_b2;
 250   int left, right, up, down;
 251   int result = 0;
 252
 253   if (joystick_status == JOYSTICK_OFF)
 254     return 0;
 255
 256   if (game_status == SETUPINPUT)
 257     return 0;
 258
 259   if (joystick_fd < 0 || !setup.input[player_nr].use_joystick)
 260     return 0;
 261
 262   if (read(joystick_fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
 263   {
 264     Error(ERR_WARN, "cannot read joystick device '%s'",
 265           setup.input[player_nr].joy.device_name);
 266     joystick_status = JOYSTICK_OFF;
 267     return 0;
 268   }
 269
 270   js_x  = joy_ctrl.x;
 271   js_y  = joy_ctrl.y;
 272
 273 #ifdef __FreeBSD__
 274   js_b1 = joy_ctrl.b1;
 275   js_b2 = joy_ctrl.b2;
 276 #else
 277   js_b1 = joy_ctrl.buttons & 1;
 278   js_b2 = joy_ctrl.buttons & 2;
 279 #endif
 280
 281   left  = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 282                            setup.input[player_nr].joy.xleft,  js_x);
 283   right = JoystickPosition(setup.input[player_nr].joy.xmiddle,
 284                            setup.input[player_nr].joy.xright, js_x);
 285   up    = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 286                            setup.input[player_nr].joy.yupper, js_y);
 287   down  = JoystickPosition(setup.input[player_nr].joy.ymiddle,
 288                            setup.input[player_nr].joy.ylower, js_y);
 289
 290   if (left > JOYSTICK_PERCENT)
 291     result |= JOY_LEFT;
 292   else if (right > JOYSTICK_PERCENT)
 293     result |= JOY_RIGHT;
 294   if (up > JOYSTICK_PERCENT)
 295     result |= JOY_UP;
 296   else if (down > JOYSTICK_PERCENT)
 297     result |= JOY_DOWN;
 298
 299   if (js_b1)
 300     result |= JOY_BUTTON_1;
 301   if (js_b2)
 302     result |= JOY_BUTTON_2;
 303
 304   return result;
 305 }
 306
 307 #else /* MSDOS */
 308
 309 /* allegro global variables for joystick control */
 310 extern int num_joysticks;
 311 extern JOYSTICK_INFO joy[];
 312
 313 int Joystick(int player_nr)
 314 {
 315   int joystick_nr = stored_player[player_nr].joystick_fd;
 316   int result = 0;
 317
 318   if (joystick_status == JOYSTICK_OFF)
 319     return 0;
 320
 321   if (game_status == SETUPINPUT)
 322     return 0;
 323
 324   if (joystick_nr < 0)
 325     return 0;
 326
 327   /* the allegro global variable 'num_joysticks' contains the number
 328      of joysticks found at initialization under MSDOS / Windows */
 329
 330 #if 0
 331   if (joystick_nr >= num_joysticks || !setup.input[player_nr].use_joystick)
 332     return 0;
 333 #else
 334
 335 #if 1
 336   if (joystick_nr >= num_joysticks ||
 337       (game_status == PLAYING && !setup.input[player_nr].use_joystick))
 338     return 0;
 339 #else
 340   if (joystick_nr >= num_joysticks)
 341     return 0;
 342 #endif
 343
 344 #endif
 345
 346   poll_joystick();
 347
 348   if (joy[joystick_nr].stick[0].axis[0].d1)
 349     result |= JOY_LEFT;
 350   else if (joy[joystick_nr].stick[0].axis[0].d2)
 351     result |= JOY_RIGHT;
 352   if (joy[joystick_nr].stick[0].axis[1].d1)
 353     result |= JOY_UP;
 354   else if (joy[joystick_nr].stick[0].axis[1].d2)
 355     result |= JOY_DOWN;
 356
 357   if (joy[joystick_nr].button[0].b)
 358     result |= JOY_BUTTON_1;
 359   if (joy[joystick_nr].button[1].b)
 360     result |= JOY_BUTTON_2;
 361
 362   return result;
 363 }
 364 #endif /* MSDOS */
 365
 366 #endif /* !USE_SDL_JOYSTICK */
 367
 368 int JoystickButton(int player_nr)
 369 {
 370   static int last_joy_button[MAX_PLAYERS] = { 0, 0, 0, 0 };
 371   int joy_button = (Joystick(player_nr) & JOY_BUTTON);
 372   int result;
 373
 374   if (joy_button)
 375   {
 376     if (last_joy_button[player_nr])
 377       result = JOY_BUTTON_PRESSED;
 378     else
 379       result = JOY_BUTTON_NEW_PRESSED;
 380   }
 381   else
 382   {
 383     if (last_joy_button[player_nr])
 384       result = JOY_BUTTON_NEW_RELEASED;
 385     else
 386       result = JOY_BUTTON_NOT_PRESSED;
 387   }
 388
 389   last_joy_button[player_nr] = joy_button;
 390   return result;
 391 }
 392
 393 int AnyJoystick()
 394 {
 395   int i;
 396   int result = 0;
 397
 398   for (i=0; i<MAX_PLAYERS; i++)
 399   {
 400
 401     /*
 402     if (!setup.input[i].use_joystick)
 403       continue;
 404       */
 405
 406
 407     result |= Joystick(i);
 408   }
 409
 410   return result;
 411 }
 412
 413 int AnyJoystickButton()
 414 {
 415   int i;
 416   int result;
 417
 418   for (i=0; i<MAX_PLAYERS; i++)
 419   {
 420
 421     /*
 422     if (!setup.input[i].use_joystick)
 423       continue;
 424       */
 425
 426     /*
 427     result |= JoystickButton(i);
 428     */
 429
 430     result = JoystickButton(i);
 431     if (result != JOY_BUTTON_NOT_PRESSED)
 432       break;
 433   }
 434
 435   return result;
 436 }