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
  23 #define MAX_JOYSTICKS 16
  24
  25 #define MAX_AXES_PER_JOYSTICK 8
  26 #define MAX_BUTTONS_PER_JOYSTICK 16
  27 #define MAX_HATS_PER_JOYSTICK 4
  28
  29 extern char *joybutton_text[]; //from kconfig.c
  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         Joystick.buttons[button].state = jbe->state;
  84
  85         switch (jbe->type) {
  86         case SDL_JOYBUTTONDOWN:
  87                 Joystick.buttons[button].time_went_down
  88                         = timer_get_fixed_seconds();
  89                 Joystick.buttons[button].num_downs++;
  90                 break;
  91         case SDL_JOYBUTTONUP:
  92                 Joystick.buttons[button].num_ups++;
  93                 break;
  94         }
  95 }
  96
  97 void joy_hat_handler(SDL_JoyHatEvent *jhe)
  98 {
  99         int hat = SDL_Joysticks[jhe->which].hat_map[jhe->hat];
 100         int hbi;
 101
 102         //Save last state of the hat-button
 103         Joystick.buttons[hat  ].last_state = Joystick.buttons[hat  ].state;
 104         Joystick.buttons[hat+1].last_state = Joystick.buttons[hat+1].state;
 105         Joystick.buttons[hat+2].last_state = Joystick.buttons[hat+2].state;
 106         Joystick.buttons[hat+3].last_state = Joystick.buttons[hat+3].state;
 107
 108         //get current state of the hat-button
 109         Joystick.buttons[hat  ].state = ((jhe->value & SDL_HAT_UP)>0);
 110         Joystick.buttons[hat+1].state = ((jhe->value & SDL_HAT_RIGHT)>0);
 111         Joystick.buttons[hat+2].state = ((jhe->value & SDL_HAT_DOWN)>0);
 112         Joystick.buttons[hat+3].state = ((jhe->value & SDL_HAT_LEFT)>0);
 113
 114         //determine if a hat-button up or down event based on state and last_state
 115         for(hbi=0;hbi<4;hbi++)
 116         {
 117                 if(     !Joystick.buttons[hat+hbi].last_state && Joystick.buttons[hat+hbi].state) //last_state up, current state down
 118                 {
 119                         Joystick.buttons[hat+hbi].time_went_down
 120                                 = timer_get_fixed_seconds();
 121                         Joystick.buttons[hat+hbi].num_downs++;
 122                 }
 123                 else if(Joystick.buttons[hat+hbi].last_state && !Joystick.buttons[hat+hbi].state)  //last_state down, current state up
 124                 {
 125                         Joystick.buttons[hat+hbi].num_ups++;
 126                 }
 127         }
 128 }
 129
 130 void joy_axis_handler(SDL_JoyAxisEvent *jae)
 131 {
 132         int axis;
 133
 134         axis = SDL_Joysticks[jae->which].axis_map[jae->axis];
 135
 136         Joystick.axes[axis].value = jae->value;
 137 }
 138
 139
 140 /* ----------------------------------------------- */
 141
 142 int joy_init()
 143 {
 144         int i,j,n;
 145         char temp[10];
 146
 147         if (SDL_Init(SDL_INIT_JOYSTICK) < 0) {
 148                 con_printf(CON_VERBOSE, "sdl-joystick: initialisation failed: %s.",SDL_GetError());
 149                 return 0;
 150         }
 151
 152         memset(&Joystick,0,sizeof(Joystick));
 153         memset(joyaxis_text, 0, JOY_MAX_AXES * sizeof(char *));
 154         memset(joybutton_text, 0, JOY_MAX_BUTTONS * sizeof(char *));
 155
 156         n = SDL_NumJoysticks();
 157
 158         con_printf(CON_VERBOSE, "sdl-joystick: found %d joysticks\n", n);
 159         for (i = 0; i < n; i++) {
 160                 con_printf(CON_VERBOSE, "sdl-joystick %d: %s\n", i, SDL_JoystickName(i));
 161                 SDL_Joysticks[num_joysticks].handle = SDL_JoystickOpen(i);
 162                 if (SDL_Joysticks[num_joysticks].handle) {
 163                         joy_present = 1;
 164
 165                         SDL_Joysticks[num_joysticks].n_axes
 166                                 = SDL_JoystickNumAxes(SDL_Joysticks[num_joysticks].handle);
 167                         if(SDL_Joysticks[num_joysticks].n_axes > MAX_AXES_PER_JOYSTICK)
 168                         {
 169                                 Warning("sdl-joystick: found %d axes, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_axes, MAX_AXES_PER_JOYSTICK);
 170                                 SDL_Joysticks[num_joysticks].n_axes = MAX_AXES_PER_JOYSTICK;
 171                         }
 172
 173                         SDL_Joysticks[num_joysticks].n_buttons
 174                                 = SDL_JoystickNumButtons(SDL_Joysticks[num_joysticks].handle);
 175                         if(SDL_Joysticks[num_joysticks].n_buttons > MAX_BUTTONS_PER_JOYSTICK)
 176                         {
 177                                 Warning("sdl-joystick: found %d buttons, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_buttons, MAX_BUTTONS_PER_JOYSTICK);
 178                                 SDL_Joysticks[num_joysticks].n_buttons = MAX_BUTTONS_PER_JOYSTICK;
 179                         }
 180
 181                         SDL_Joysticks[num_joysticks].n_hats
 182                                 = SDL_JoystickNumHats(SDL_Joysticks[num_joysticks].handle);
 183                         if(SDL_Joysticks[num_joysticks].n_hats > MAX_HATS_PER_JOYSTICK)
 184                         {
 185                                 Warning("sdl-joystick: found %d hats, only %d supported.  Game may be unstable.\n", SDL_Joysticks[num_joysticks].n_hats, MAX_HATS_PER_JOYSTICK);
 186                                 SDL_Joysticks[num_joysticks].n_hats = MAX_HATS_PER_JOYSTICK;
 187                         }
 188
 189                         con_printf(CON_VERBOSE, "sdl-joystick: %d axes\n", SDL_Joysticks[num_joysticks].n_axes);
 190                         con_printf(CON_VERBOSE, "sdl-joystick: %d buttons\n", SDL_Joysticks[num_joysticks].n_buttons);
 191                         con_printf(CON_VERBOSE, "sdl-joystick: %d hats\n", SDL_Joysticks[num_joysticks].n_hats);
 192
 193                         for (j=0; j < SDL_Joysticks[num_joysticks].n_axes; j++)
 194                         {
 195                                 sprintf(temp, "J%d A%d", i + 1, j + 1);
 196                                 joyaxis_text[Joystick.n_axes] = d_strdup(temp);
 197                                 SDL_Joysticks[num_joysticks].axis_map[j] = Joystick.n_axes++;
 198                         }
 199                         for (j=0; j < SDL_Joysticks[num_joysticks].n_buttons; j++)
 200                         {
 201                                 sprintf(temp, "J%d B%d", i + 1, j + 1);
 202                                 joybutton_text[Joystick.n_buttons] = d_strdup(temp);
 203                                 SDL_Joysticks[num_joysticks].button_map[j] = Joystick.n_buttons++;
 204                         }
 205                         for (j=0; j < SDL_Joysticks[num_joysticks].n_hats; j++)
 206                         {
 207                                 SDL_Joysticks[num_joysticks].hat_map[j] = Joystick.n_buttons;
 208                                 //a hat counts as four buttons
 209                                 sprintf(temp, "J%d H%d%c", i + 1, j + 1, 0202);
 210                                 joybutton_text[Joystick.n_buttons++] = d_strdup(temp);
 211                                 sprintf(temp, "J%d H%d%c", i + 1, j + 1, 0177);
 212                                 joybutton_text[Joystick.n_buttons++] = d_strdup(temp);
 213                                 sprintf(temp, "J%d H%d%c", i + 1, j + 1, 0200);
 214                                 joybutton_text[Joystick.n_buttons++] = d_strdup(temp);
 215                                 sprintf(temp, "J%d H%d%c", i + 1, j + 1, 0201);
 216                                 joybutton_text[Joystick.n_buttons++] = d_strdup(temp);
 217                         }
 218
 219                         num_joysticks++;
 220                 }
 221                 else
 222                         con_printf(CON_VERBOSE, "sdl-joystick: initialization failed!\n");
 223
 224                 con_printf(CON_VERBOSE, "sdl-joystick: %d axes (total)\n", Joystick.n_axes);
 225                 con_printf(CON_VERBOSE, "sdl-joystick: %d buttons (total)\n", Joystick.n_buttons);
 226         }
 227
 228         joy_num_axes = Joystick.n_axes;
 229         atexit(joy_close);
 230
 231         return joy_present;
 232 }
 233
 234 void joy_close()
 235 {
 236         while (num_joysticks)
 237                 SDL_JoystickClose(SDL_Joysticks[--num_joysticks].handle);
 238         while (Joystick.n_axes--)
 239                 d_free(joyaxis_text[Joystick.n_axes]);
 240         while (Joystick.n_buttons--)
 241                 d_free(joybutton_text[Joystick.n_buttons]);
 242 }
 243
 244 void joy_get_pos(int *x, int *y)
 245 {
 246         int axis[JOY_MAX_AXES];
 247
 248         if (!num_joysticks) {
 249                 *x=*y=0;
 250                 return;
 251         }
 252
 253         joystick_read_raw_axis (JOY_ALL_AXIS, axis);
 254
 255         *x = joy_get_scaled_reading( axis[0], 0 );
 256         *y = joy_get_scaled_reading( axis[1], 1 );
 257 }
 258
 259 int joy_get_btns()
 260 {
 261 #if 0 // This is never used?
 262         int i, buttons = 0;
 263         for (i=0; i++; i<buttons) {
 264                 switch (Joystick.buttons[i].state) {
 265                 case SDL_PRESSED:
 266                         buttons |= 1<<i;
 267                         break;
 268                 case SDL_RELEASED:
 269                         break;
 270                 }
 271         }
 272         return buttons;
 273 #else
 274         return 0;
 275 #endif
 276 }
 277
 278 int joy_get_button_down_cnt( int btn )
 279 {
 280         int num_downs;
 281
 282         if (!num_joysticks)
 283                 return 0;
 284
 285         event_poll();
 286
 287         num_downs = Joystick.buttons[btn].num_downs;
 288         Joystick.buttons[btn].num_downs = 0;
 289
 290         return num_downs;
 291 }
 292
 293 fix joy_get_button_down_time(int btn)
 294 {
 295         fix time = F0_0;
 296
 297         if (!num_joysticks)
 298                 return 0;
 299
 300         event_poll();
 301
 302         switch (Joystick.buttons[btn].state) {
 303         case SDL_PRESSED:
 304                 time = timer_get_fixed_seconds() - Joystick.buttons[btn].time_went_down;
 305                 Joystick.buttons[btn].time_went_down = timer_get_fixed_seconds();
 306                 break;
 307         case SDL_RELEASED:
 308                 time = 0;
 309                 break;
 310         }
 311
 312         return time;
 313 }
 314
 315 ubyte joystick_read_raw_axis( ubyte mask, int * axis )
 316 {
 317         int i;
 318         ubyte channel_masks = 0;
 319
 320         if (!num_joysticks)
 321                 return 0;
 322
 323         event_poll();
 324
 325         for (i = 0; i < Joystick.n_axes; i++)
 326         {
 327                 if ((axis[i] = Joystick.axes[i].value))
 328                         channel_masks |= 1 << i;
 329         }
 330
 331         return channel_masks;
 332 }
 333
 334 void joy_flush()
 335 {
 336         int i;
 337
 338         if (!num_joysticks)
 339                 return;
 340
 341         for (i = 0; i < Joystick.n_buttons; i++) {
 342                 Joystick.buttons[i].time_went_down = 0;
 343                 Joystick.buttons[i].num_downs = 0;
 344         }
 345
 346 }
 347
 348 int joy_get_button_state( int btn )
 349 {
 350         if (!num_joysticks)
 351                 return 0;
 352
 353         if(btn >= Joystick.n_buttons)
 354                 return 0;
 355
 356         event_poll();
 357
 358         return Joystick.buttons[btn].state;
 359 }
 360
 361 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 362 {
 363         int i;
 364
 365         for (i = 0; i < Joystick.n_axes; i++)
 366         {
 367                 axis_center[i] = Joystick.axes[i].center_val;
 368                 axis_min[i] = Joystick.axes[i].min_val;
 369                 axis_max[i] = Joystick.axes[i].max_val;
 370         }
 371 }
 372
 373 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 374 {
 375         int i;
 376
 377         for (i = 0; i < Joystick.n_axes; i++)
 378         {
 379                 Joystick.axes[i].center_val = axis_center[i];
 380                 Joystick.axes[i].min_val = axis_min[i];
 381                 Joystick.axes[i].max_val = axis_max[i];
 382         }
 383 }
 384
 385 int joy_get_scaled_reading( int raw, int axis_num )
 386 {
 387 #if 1
 388         return raw/256;
 389 #else
 390         int d, x;
 391
 392         raw -= Joystick.axes[axis_num].center_val;
 393
 394         if (raw < 0)
 395                 d = Joystick.axes[axis_num].center_val - Joystick.axes[axis_num].min_val;
 396         else if (raw > 0)
 397                 d = Joystick.axes[axis_num].max_val - Joystick.axes[axis_num].center_val;
 398         else
 399                 d = 0;
 400
 401         if (d)
 402                 x = ((raw << 7) / d);
 403         else
 404                 x = 0;
 405
 406         if ( x < -128 )
 407                 x = -128;
 408         if ( x > 127 )
 409                 x = 127;
 410
 411         d =  (joy_deadzone) * 6;
 412         if ((x > (-1*d)) && (x < d))
 413                 x = 0;
 414
 415         return x;
 416 #endif
 417 }
 418
 419 void joy_set_slow_reading( int flag )
 420 {
 421 }