arch/sdl/joy.c

   1 /*
   2  *
   3  * SDL joystick support
   4  *
   5  *
   6  */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include <conf.h>
  10 #endif
  11
  12 #include <string.h>   // for memset
  13 #include <SDL.h>
  14
  15 #include "joy.h"
  16 #include "error.h"
  17 #include "timer.h"
  18 #include "console.h"
  19 #include "event.h"
  20 #include "text.h"
  21 #include "u_mem.h"
  22 #include "key.h"
  23
  24 #define MAX_JOYSTICKS 16
  25
  26 #define MAX_AXES_PER_JOYSTICK 8
  27 #define MAX_BUTTONS_PER_JOYSTICK 16
  28 #define MAX_HATS_PER_JOYSTICK 4
  29
  30 extern char *joyaxis_text[]; //from kconfig.c
  31
  32 char joy_present = 0;
  33 int num_joysticks = 0;
  34
  35 int joy_deadzone = 0;
  36
  37 int joy_num_axes = 0;
  38
  39 struct joybutton {
  40         int state;
  41         int last_state;
  42         fix time_went_down;
  43         int num_downs;
  44         int num_ups;
  45 };
  46
  47 struct joyaxis {
  48         int             value;
  49         int             min_val;
  50         int             center_val;
  51         int             max_val;
  52 };
  53
  54 /* This struct is a "virtual" joystick, which includes all the axes
  55  * and buttons of every joystick found.
  56  */
  57 static struct joyinfo {
  58         int n_axes;
  59         int n_buttons;
  60         struct joyaxis axes[JOY_MAX_AXES];
  61         struct joybutton buttons[JOY_MAX_BUTTONS];
  62 } Joystick;
  63
  64 /* This struct is an array, with one entry for each physical joystick
  65  * found.
  66  */
  67 static struct {
  68         SDL_Joystick *handle;
  69         int n_axes;
  70         int n_buttons;
  71         int n_hats;
  72         int hat_map[MAX_HATS_PER_JOYSTICK];  //Note: Descent expects hats to be buttons, so these are indices into Joystick.buttons
  73         int axis_map[MAX_AXES_PER_JOYSTICK];
  74         int button_map[MAX_BUTTONS_PER_JOYSTICK];
  75 } SDL_Joysticks[MAX_JOYSTICKS];
  76
  77 void joy_button_handler(SDL_JoyButtonEvent *jbe)
  78 {
  79         int button;
  80
  81         button = SDL_Joysticks[jbe->which].button_map[jbe->button];
  82
  83         vkey_handler(KEY_JB1 + button, jbe->state == SDL_JOYBUTTONDOWN);
  84
  85         Joystick.buttons[button].state = jbe->state;
  86
  87         switch (jbe->type) {
  88         case SDL_JOYBUTTONDOWN:
  89                 Joystick.buttons[button].time_went_down
  90                         = timer_get_fixed_seconds();
  91                 Joystick.buttons[button].num_downs++;
  92                 break;
  93         case SDL_JOYBUTTONUP:
  94                 Joystick.buttons[button].num_ups++;
  95                 break;
  96         }
  97 }
  98
  99 void joy_hat_handler(SDL_JoyHatEvent *jhe)
 100 {
 101         int hat = SDL_Joysticks[jhe->which].hat_map[jhe->hat];
 102         int hbi;
 103
 104         //Save last state of the hat-button
 105         Joystick.buttons[hat  ].last_state = Joystick.buttons[hat  ].state;
 106         Joystick.buttons[hat+1].last_state = Joystick.buttons[hat+1].state;
 107         Joystick.buttons[hat+2].last_state = Joystick.buttons[hat+2].state;
 108         Joystick.buttons[hat+3].last_state = Joystick.buttons[hat+3].state;
 109
 110         //get current state of the hat-button
 111         Joystick.buttons[hat  ].state = ((jhe->value & SDL_HAT_UP)>0);
 112         Joystick.buttons[hat+1].state = ((jhe->value & SDL_HAT_RIGHT)>0);
 113         Joystick.buttons[hat+2].state = ((jhe->value & SDL_HAT_DOWN)>0);
 114         Joystick.buttons[hat+3].state = ((jhe->value & SDL_HAT_LEFT)>0);
 115
 116         //determine if a hat-button up or down event based on state and last_state
 117         for(hbi=0;hbi<4;hbi++)
 118         {
 119                 if(     !Joystick.buttons[hat+hbi].last_state && Joystick.buttons[hat+hbi].state) //last_state up, current state down
 120                 {
 121                         Joystick.buttons[hat+hbi].time_went_down
 122                                 = timer_get_fixed_seconds();
 123                         Joystick.buttons[hat+hbi].num_downs++;
 124                 }
 125                 else if(Joystick.buttons[hat+hbi].last_state && !Joystick.buttons[hat+hbi].state)  //last_state down, current state up
 126                 {
 127                         Joystick.buttons[hat+hbi].num_ups++;
 128                 }
 129         }
 130 }
 131
 132 void joy_axis_handler(SDL_JoyAxisEvent *jae)
 133 {
 134         int axis;
 135
 136         axis = SDL_Joysticks[jae->which].axis_map[jae->axis];
 137
 138         Joystick.axes[axis].value = jae->value;
 139 }
 140
 141
 142 /* ----------------------------------------------- */
 143
 144 int joy_init()
 145 {
 146         int i,j,n;
 147         char temp[10];
 148
 149         if (SDL_Init(SDL_INIT_JOYSTICK) < 0) {
 150                 con_printf(CON_VERBOSE, "sdl-joystick: initialisation failed: %s.",SDL_GetError());
 151                 return 0;
 152         }
 153
 154         memset(&Joystick,0,sizeof(Joystick));
 155         memset(joyaxis_text, 0, JOY_MAX_AXES * sizeof(char *));
 156
 157         n = SDL_NumJoysticks();
 158
 159         con_printf(CON_VERBOSE, "sdl-joystick: found %d joysticks\n", n);
 160         for (i = 0; i < n; i++) {
 161                 con_printf(CON_VERBOSE, "sdl-joystick %d: %s\n", i, SDL_JoystickName(i));
 162                 SDL_Joysticks[num_joysticks].handle = SDL_JoystickOpen(i);
 163                 if (SDL_Joysticks[num_joysticks].handle) {
 164                         joy_present = 1;
 165
 166                         SDL_Joysticks[num_joysticks].n_axes
 167                                 = SDL_JoystickNumAxes(SDL_Joysticks[num_joysticks].handle);
 168                         if(SDL_Joysticks[num_joysticks].n_axes > MAX_AXES_PER_JOYSTICK)
 169                         {
 170                                 Warning("sdl-joystick: found %d axes, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_axes, MAX_AXES_PER_JOYSTICK);
 171                                 SDL_Joysticks[num_joysticks].n_axes = MAX_AXES_PER_JOYSTICK;
 172                         }
 173
 174                         SDL_Joysticks[num_joysticks].n_buttons
 175                                 = SDL_JoystickNumButtons(SDL_Joysticks[num_joysticks].handle);
 176                         if(SDL_Joysticks[num_joysticks].n_buttons > MAX_BUTTONS_PER_JOYSTICK)
 177                         {
 178                                 Warning("sdl-joystick: found %d buttons, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_buttons, MAX_BUTTONS_PER_JOYSTICK);
 179                                 SDL_Joysticks[num_joysticks].n_buttons = MAX_BUTTONS_PER_JOYSTICK;
 180                         }
 181
 182                         SDL_Joysticks[num_joysticks].n_hats
 183                                 = SDL_JoystickNumHats(SDL_Joysticks[num_joysticks].handle);
 184                         if(SDL_Joysticks[num_joysticks].n_hats > MAX_HATS_PER_JOYSTICK)
 185                         {
 186                                 Warning("sdl-joystick: found %d hats, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_hats, MAX_HATS_PER_JOYSTICK);
 187                                 SDL_Joysticks[num_joysticks].n_hats = MAX_HATS_PER_JOYSTICK;
 188                         }
 189
 190                         con_printf(CON_VERBOSE, "sdl-joystick: %d axes\n", SDL_Joysticks[num_joysticks].n_axes);
 191                         con_printf(CON_VERBOSE, "sdl-joystick: %d buttons\n", SDL_Joysticks[num_joysticks].n_buttons);
 192                         con_printf(CON_VERBOSE, "sdl-joystick: %d hats\n", SDL_Joysticks[num_joysticks].n_hats);
 193
 194                         for (j=0; j < SDL_Joysticks[num_joysticks].n_axes; j++)
 195                         {
 196                                 sprintf(temp, "J%d A%d", i + 1, j + 1);
 197                                 joyaxis_text[Joystick.n_axes] = d_strdup(temp);
 198                                 SDL_Joysticks[num_joysticks].axis_map[j] = Joystick.n_axes++;
 199                         }
 200                         for (j=0; j < SDL_Joysticks[num_joysticks].n_buttons; j++)
 201                         {
 202                                 sprintf(temp, "J%dB%d", i + 1, j + 1);
 203                                 key_text[KEY_JB1 + Joystick.n_buttons] = d_strdup(temp);
 204                                 SDL_Joysticks[num_joysticks].button_map[j] = Joystick.n_buttons++;
 205                         }
 206                         for (j=0; j < SDL_Joysticks[num_joysticks].n_hats; j++)
 207                         {
 208                                 SDL_Joysticks[num_joysticks].hat_map[j] = Joystick.n_buttons;
 209                                 //a hat counts as four buttons
 210
 211                                 sprintf(temp, "J%dH%dUP", i + 1, j + 1);
 212                                 key_text[KEY_JB1 + Joystick.n_buttons] = d_strdup(temp);
 213                                 Joystick.n_buttons++;
 214
 215                                 sprintf(temp, "J%dH%dRIGHT", i + 1, j + 1);
 216                                 key_text[KEY_JB1 + Joystick.n_buttons] = d_strdup(temp);
 217                                 Joystick.n_buttons++;
 218
 219                                 sprintf(temp, "J%dH%dDOWN", i + 1, j + 1);
 220                                 key_text[KEY_JB1 + Joystick.n_buttons] = d_strdup(temp);
 221                                 Joystick.n_buttons++;
 222
 223                                 sprintf(temp, "J%dH%dLEFT", i + 1, j + 1);
 224                                 key_text[KEY_JB1 + Joystick.n_buttons] = d_strdup(temp);
 225                                 Joystick.n_buttons++;
 226                         }
 227
 228                         num_joysticks++;
 229                 }
 230                 else
 231                         con_printf(CON_VERBOSE, "sdl-joystick: initialization failed!\n");
 232
 233                 con_printf(CON_VERBOSE, "sdl-joystick: %d axes (total)\n", Joystick.n_axes);
 234                 con_printf(CON_VERBOSE, "sdl-joystick: %d buttons (total)\n", Joystick.n_buttons);
 235         }
 236
 237         joy_num_axes = Joystick.n_axes;
 238         atexit(joy_close);
 239
 240         return joy_present;
 241 }
 242
 243 void joy_close()
 244 {
 245         while (num_joysticks)
 246                 SDL_JoystickClose(SDL_Joysticks[--num_joysticks].handle);
 247         while (Joystick.n_axes--)
 248                 d_free(joyaxis_text[Joystick.n_axes]);
 249 }
 250
 251 void joy_get_pos(int *x, int *y)
 252 {
 253         int axis[JOY_MAX_AXES];
 254
 255         if (!num_joysticks) {
 256                 *x=*y=0;
 257                 return;
 258         }
 259
 260         joystick_read_raw_axis (JOY_ALL_AXIS, axis);
 261
 262         *x = joy_get_scaled_reading( axis[0], 0 );
 263         *y = joy_get_scaled_reading( axis[1], 1 );
 264 }
 265
 266 int joy_get_btns()
 267 {
 268 #if 0 // This is never used?
 269         int i, buttons = 0;
 270         for (i=0; i++; i<buttons) {
 271                 switch (Joystick.buttons[i].state) {
 272                 case SDL_PRESSED:
 273                         buttons |= 1<<i;
 274                         break;
 275                 case SDL_RELEASED:
 276                         break;
 277                 }
 278         }
 279         return buttons;
 280 #else
 281         return 0;
 282 #endif
 283 }
 284
 285 int joy_get_button_down_cnt( int btn )
 286 {
 287         int num_downs;
 288
 289         if (!num_joysticks)
 290                 return 0;
 291
 292         event_poll();
 293
 294         num_downs = Joystick.buttons[btn].num_downs;
 295         Joystick.buttons[btn].num_downs = 0;
 296
 297         return num_downs;
 298 }
 299
 300 fix joy_get_button_down_time(int btn)
 301 {
 302         fix time = F0_0;
 303
 304         if (!num_joysticks)
 305                 return 0;
 306
 307         event_poll();
 308
 309         switch (Joystick.buttons[btn].state) {
 310         case SDL_PRESSED:
 311                 time = timer_get_fixed_seconds() - Joystick.buttons[btn].time_went_down;
 312                 Joystick.buttons[btn].time_went_down = timer_get_fixed_seconds();
 313                 break;
 314         case SDL_RELEASED:
 315                 time = 0;
 316                 break;
 317         }
 318
 319         return time;
 320 }
 321
 322 ubyte joystick_read_raw_axis( ubyte mask, int * axis )
 323 {
 324         int i;
 325         ubyte channel_masks = 0;
 326
 327         if (!num_joysticks)
 328                 return 0;
 329
 330         event_poll();
 331
 332         for (i = 0; i < Joystick.n_axes; i++)
 333         {
 334                 if ((axis[i] = Joystick.axes[i].value))
 335                         channel_masks |= 1 << i;
 336         }
 337
 338         return channel_masks;
 339 }
 340
 341 void joy_flush()
 342 {
 343         int i;
 344
 345         if (!num_joysticks)
 346                 return;
 347
 348         for (i = 0; i < Joystick.n_buttons; i++) {
 349                 Joystick.buttons[i].time_went_down = 0;
 350                 Joystick.buttons[i].num_downs = 0;
 351         }
 352
 353 }
 354
 355 int joy_get_button_state( int btn )
 356 {
 357         if (!num_joysticks)
 358                 return 0;
 359
 360         if(btn >= Joystick.n_buttons)
 361                 return 0;
 362
 363         event_poll();
 364
 365         return Joystick.buttons[btn].state;
 366 }
 367
 368 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 369 {
 370         int i;
 371
 372         for (i = 0; i < Joystick.n_axes; i++)
 373         {
 374                 axis_center[i] = Joystick.axes[i].center_val;
 375                 axis_min[i] = Joystick.axes[i].min_val;
 376                 axis_max[i] = Joystick.axes[i].max_val;
 377         }
 378 }
 379
 380 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 381 {
 382         int i;
 383
 384         for (i = 0; i < Joystick.n_axes; i++)
 385         {
 386                 Joystick.axes[i].center_val = axis_center[i];
 387                 Joystick.axes[i].min_val = axis_min[i];
 388                 Joystick.axes[i].max_val = axis_max[i];
 389         }
 390 }
 391
 392 int joy_get_scaled_reading( int raw, int axis_num )
 393 {
 394 #if 1
 395         return raw/256;
 396 #else
 397         int d, x;
 398
 399         raw -= Joystick.axes[axis_num].center_val;
 400
 401         if (raw < 0)
 402                 d = Joystick.axes[axis_num].center_val - Joystick.axes[axis_num].min_val;
 403         else if (raw > 0)
 404                 d = Joystick.axes[axis_num].max_val - Joystick.axes[axis_num].center_val;
 405         else
 406                 d = 0;
 407
 408         if (d)
 409                 x = ((raw << 7) / d);
 410         else
 411                 x = 0;
 412
 413         if ( x < -128 )
 414                 x = -128;
 415         if ( x > 127 )
 416                 x = 127;
 417
 418         d =  (joy_deadzone) * 6;
 419         if ((x > (-1*d)) && (x < d))
 420                 x = 0;
 421
 422         return x;
 423 #endif
 424 }
 425
 426 void joy_set_slow_reading( int flag )
 427 {
 428 }