Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | 604d73db6802 |
| children | 19418e4422cb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* This is the joystick API for Simple DirectMedia Layer */ | |
| 24 | |
| 25 #include "SDL_events.h" | |
| 26 #ifndef DISABLE_EVENTS | |
| 27 #include "SDL_events_c.h" | |
| 28 #endif | |
| 29 #include "SDL_joystick_c.h" | |
| 30 #include "SDL_sysjoystick.h" | |
| 31 | |
| 32 /* This is used for Quake III Arena */ | |
| 33 #ifdef DISABLE_EVENTS | |
| 34 #define SDL_Lock_EventThread() | |
| 35 #define SDL_Unlock_EventThread() | |
| 36 #endif | |
| 37 | |
| 38 Uint8 SDL_numjoysticks = 0; | |
| 39 SDL_Joystick **SDL_joysticks = NULL; | |
| 40 static SDL_Joystick *default_joystick = NULL; | |
| 41 | |
| 42 int SDL_JoystickInit(void) | |
| 43 { | |
| 44 int arraylen; | |
| 45 int status; | |
| 46 | |
| 47 SDL_numjoysticks = 0; | |
| 48 status = SDL_SYS_JoystickInit(); | |
| 49 if ( status >= 0 ) { | |
| 50 arraylen = (status+1)*sizeof(*SDL_joysticks); | |
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51 SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen); |
| 0 | 52 if ( SDL_joysticks == NULL ) { |
| 53 SDL_numjoysticks = 0; | |
| 54 } else { | |
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55 SDL_memset(SDL_joysticks, 0, arraylen); |
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56 SDL_numjoysticks = status; |
| 0 | 57 } |
| 58 status = 0; | |
| 59 } | |
| 60 default_joystick = NULL; | |
| 61 return(status); | |
| 62 } | |
| 63 | |
| 64 /* | |
| 65 * Count the number of joysticks attached to the system | |
| 66 */ | |
| 67 int SDL_NumJoysticks(void) | |
| 68 { | |
| 69 return SDL_numjoysticks; | |
| 70 } | |
| 71 | |
| 72 /* | |
| 73 * Get the implementation dependent name of a joystick | |
| 74 */ | |
| 75 const char *SDL_JoystickName(int device_index) | |
| 76 { | |
| 77 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 78 SDL_SetError("There are %d joysticks available", | |
| 79 SDL_numjoysticks); | |
| 80 return(NULL); | |
| 81 } | |
| 82 return(SDL_SYS_JoystickName(device_index)); | |
| 83 } | |
| 84 | |
| 85 /* | |
| 86 * Open a joystick for use - the index passed as an argument refers to | |
| 87 * the N'th joystick on the system. This index is the value which will | |
| 88 * identify this joystick in future joystick events. | |
| 89 * | |
| 90 * This function returns a joystick identifier, or NULL if an error occurred. | |
| 91 */ | |
| 92 SDL_Joystick *SDL_JoystickOpen(int device_index) | |
| 93 { | |
| 94 int i; | |
| 95 SDL_Joystick *joystick; | |
| 96 | |
| 97 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 98 SDL_SetError("There are %d joysticks available", | |
| 99 SDL_numjoysticks); | |
| 100 return(NULL); | |
| 101 } | |
| 102 | |
| 103 /* If the joystick is already open, return it */ | |
| 104 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 105 if ( device_index == SDL_joysticks[i]->index ) { | |
| 106 joystick = SDL_joysticks[i]; | |
| 107 ++joystick->ref_count; | |
| 108 return(joystick); | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 /* Create and initialize the joystick */ | |
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113 joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick)); |
| 0 | 114 if ( joystick != NULL ) { |
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115 SDL_memset(joystick, 0, (sizeof *joystick)); |
| 0 | 116 joystick->index = device_index; |
| 117 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { | |
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118 SDL_free(joystick); |
| 0 | 119 joystick = NULL; |
| 120 } else { | |
| 121 if ( joystick->naxes > 0 ) { | |
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122 joystick->axes = (Sint16 *)SDL_malloc |
| 0 | 123 (joystick->naxes*sizeof(Sint16)); |
| 124 } | |
| 125 if ( joystick->nhats > 0 ) { | |
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126 joystick->hats = (Uint8 *)SDL_malloc |
| 0 | 127 (joystick->nhats*sizeof(Uint8)); |
| 128 } | |
| 129 if ( joystick->nballs > 0 ) { | |
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130 joystick->balls = (struct balldelta *)SDL_malloc |
| 0 | 131 (joystick->nballs*sizeof(*joystick->balls)); |
| 132 } | |
| 133 if ( joystick->nbuttons > 0 ) { | |
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134 joystick->buttons = (Uint8 *)SDL_malloc |
| 0 | 135 (joystick->nbuttons*sizeof(Uint8)); |
| 136 } | |
| 137 if ( ((joystick->naxes > 0) && !joystick->axes) | |
| 138 || ((joystick->nhats > 0) && !joystick->hats) | |
| 139 || ((joystick->nballs > 0) && !joystick->balls) | |
| 140 || ((joystick->nbuttons > 0) && !joystick->buttons)) { | |
| 141 SDL_OutOfMemory(); | |
| 142 SDL_JoystickClose(joystick); | |
| 143 joystick = NULL; | |
| 144 } | |
| 145 if ( joystick->axes ) { | |
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146 SDL_memset(joystick->axes, 0, |
| 0 | 147 joystick->naxes*sizeof(Sint16)); |
| 148 } | |
| 149 if ( joystick->hats ) { | |
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150 SDL_memset(joystick->hats, 0, |
| 0 | 151 joystick->nhats*sizeof(Uint8)); |
| 152 } | |
| 153 if ( joystick->balls ) { | |
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154 SDL_memset(joystick->balls, 0, |
| 0 | 155 joystick->nballs*sizeof(*joystick->balls)); |
| 156 } | |
| 157 if ( joystick->buttons ) { | |
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158 SDL_memset(joystick->buttons, 0, |
| 0 | 159 joystick->nbuttons*sizeof(Uint8)); |
| 160 } | |
| 161 } | |
| 162 } | |
| 163 if ( joystick ) { | |
| 164 /* Add joystick to list */ | |
| 165 ++joystick->ref_count; | |
| 166 SDL_Lock_EventThread(); | |
| 167 for ( i=0; SDL_joysticks[i]; ++i ) | |
| 168 /* Skip to next joystick */; | |
| 169 SDL_joysticks[i] = joystick; | |
| 170 SDL_Unlock_EventThread(); | |
| 171 } | |
| 172 return(joystick); | |
| 173 } | |
| 174 | |
| 175 /* | |
| 176 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 177 */ | |
| 178 int SDL_JoystickOpened(int device_index) | |
| 179 { | |
| 180 int i, opened; | |
| 181 | |
| 182 opened = 0; | |
| 183 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 184 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 185 opened = 1; | |
| 186 break; | |
| 187 } | |
| 188 } | |
| 189 return(opened); | |
| 190 } | |
| 191 | |
| 192 static int ValidJoystick(SDL_Joystick **joystick) | |
| 193 { | |
| 194 int valid; | |
| 195 | |
| 196 if ( *joystick == NULL ) { | |
| 197 *joystick = default_joystick; | |
| 198 } | |
| 199 if ( *joystick == NULL ) { | |
| 200 SDL_SetError("Joystick hasn't been opened yet"); | |
| 201 valid = 0; | |
| 202 } else { | |
| 203 valid = 1; | |
| 204 } | |
| 205 return valid; | |
| 206 } | |
| 207 | |
| 208 /* | |
| 209 * Get the device index of an opened joystick. | |
| 210 */ | |
| 211 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 212 { | |
| 213 if ( ! ValidJoystick(&joystick) ) { | |
| 214 return(-1); | |
| 215 } | |
| 216 return(joystick->index); | |
| 217 } | |
| 218 | |
| 219 /* | |
| 220 * Get the number of multi-dimensional axis controls on a joystick | |
| 221 */ | |
| 222 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 223 { | |
| 224 if ( ! ValidJoystick(&joystick) ) { | |
| 225 return(-1); | |
| 226 } | |
| 227 return(joystick->naxes); | |
| 228 } | |
| 229 | |
| 230 /* | |
| 231 * Get the number of hats on a joystick | |
| 232 */ | |
| 233 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 234 { | |
| 235 if ( ! ValidJoystick(&joystick) ) { | |
| 236 return(-1); | |
| 237 } | |
| 238 return(joystick->nhats); | |
| 239 } | |
| 240 | |
| 241 /* | |
| 242 * Get the number of trackballs on a joystick | |
| 243 */ | |
| 244 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 245 { | |
| 246 if ( ! ValidJoystick(&joystick) ) { | |
| 247 return(-1); | |
| 248 } | |
| 249 return(joystick->nballs); | |
| 250 } | |
| 251 | |
| 252 /* | |
| 253 * Get the number of buttons on a joystick | |
| 254 */ | |
| 255 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 256 { | |
| 257 if ( ! ValidJoystick(&joystick) ) { | |
| 258 return(-1); | |
| 259 } | |
| 260 return(joystick->nbuttons); | |
| 261 } | |
| 262 | |
| 263 /* | |
| 264 * Get the current state of an axis control on a joystick | |
| 265 */ | |
| 266 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 267 { | |
| 268 Sint16 state; | |
| 269 | |
| 270 if ( ! ValidJoystick(&joystick) ) { | |
| 271 return(0); | |
| 272 } | |
| 273 if ( axis < joystick->naxes ) { | |
| 274 state = joystick->axes[axis]; | |
| 275 } else { | |
| 276 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 277 state = 0; | |
| 278 } | |
| 279 return(state); | |
| 280 } | |
| 281 | |
| 282 /* | |
| 283 * Get the current state of a hat on a joystick | |
| 284 */ | |
| 285 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 286 { | |
| 287 Uint8 state; | |
| 288 | |
| 289 if ( ! ValidJoystick(&joystick) ) { | |
| 290 return(0); | |
| 291 } | |
| 292 if ( hat < joystick->nhats ) { | |
| 293 state = joystick->hats[hat]; | |
| 294 } else { | |
| 295 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 296 state = 0; | |
| 297 } | |
| 298 return(state); | |
| 299 } | |
| 300 | |
| 301 /* | |
| 302 * Get the ball axis change since the last poll | |
| 303 */ | |
| 304 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 305 { | |
| 306 int retval; | |
| 307 | |
| 308 if ( ! ValidJoystick(&joystick) ) { | |
| 309 return(-1); | |
| 310 } | |
| 311 | |
| 312 retval = 0; | |
| 313 if ( ball < joystick->nballs ) { | |
| 314 if ( dx ) { | |
| 315 *dx = joystick->balls[ball].dx; | |
| 316 } | |
| 317 if ( dy ) { | |
| 318 *dy = joystick->balls[ball].dy; | |
| 319 } | |
| 320 joystick->balls[ball].dx = 0; | |
| 321 joystick->balls[ball].dy = 0; | |
| 322 } else { | |
| 323 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 324 retval = -1; | |
| 325 } | |
| 326 return(retval); | |
| 327 } | |
| 328 | |
| 329 /* | |
| 330 * Get the current state of a button on a joystick | |
| 331 */ | |
| 332 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 333 { | |
| 334 Uint8 state; | |
| 335 | |
| 336 if ( ! ValidJoystick(&joystick) ) { | |
| 337 return(0); | |
| 338 } | |
| 339 if ( button < joystick->nbuttons ) { | |
| 340 state = joystick->buttons[button]; | |
| 341 } else { | |
| 342 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 343 state = 0; | |
| 344 } | |
| 345 return(state); | |
| 346 } | |
| 347 | |
| 348 /* | |
| 349 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 350 */ | |
| 351 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 352 { | |
| 353 int i; | |
| 354 | |
| 355 if ( ! ValidJoystick(&joystick) ) { | |
| 356 return; | |
| 357 } | |
| 358 | |
| 359 /* First decrement ref count */ | |
| 360 if ( --joystick->ref_count > 0 ) { | |
| 361 return; | |
| 362 } | |
| 363 | |
| 364 /* Lock the event queue - prevent joystick polling */ | |
| 365 SDL_Lock_EventThread(); | |
| 366 | |
| 367 if ( joystick == default_joystick ) { | |
| 368 default_joystick = NULL; | |
| 369 } | |
| 370 SDL_SYS_JoystickClose(joystick); | |
| 371 | |
| 372 /* Remove joystick from list */ | |
| 373 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 374 if ( joystick == SDL_joysticks[i] ) { | |
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375 SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], |
| 0 | 376 (SDL_numjoysticks-i)*sizeof(joystick)); |
| 377 break; | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 /* Let the event thread keep running */ | |
| 382 SDL_Unlock_EventThread(); | |
| 383 | |
| 384 /* Free the data associated with this joystick */ | |
| 385 if ( joystick->axes ) { | |
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386 SDL_free(joystick->axes); |
| 0 | 387 } |
| 388 if ( joystick->hats ) { | |
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389 SDL_free(joystick->hats); |
| 0 | 390 } |
| 391 if ( joystick->balls ) { | |
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392 SDL_free(joystick->balls); |
| 0 | 393 } |
| 394 if ( joystick->buttons ) { | |
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395 SDL_free(joystick->buttons); |
| 0 | 396 } |
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397 SDL_free(joystick); |
| 0 | 398 } |
| 399 | |
| 400 void SDL_JoystickQuit(void) | |
| 401 { | |
| 402 /* Stop the event polling */ | |
| 403 SDL_Lock_EventThread(); | |
| 404 SDL_numjoysticks = 0; | |
| 405 SDL_Unlock_EventThread(); | |
| 406 | |
| 407 /* Quit the joystick setup */ | |
| 408 SDL_SYS_JoystickQuit(); | |
| 409 if ( SDL_joysticks ) { | |
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410 SDL_free(SDL_joysticks); |
| 0 | 411 SDL_joysticks = NULL; |
| 412 } | |
| 413 } | |
| 414 | |
| 415 | |
| 416 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 417 | |
| 418 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 419 { | |
| 420 int posted; | |
| 421 | |
| 422 /* Update internal joystick state */ | |
| 423 joystick->axes[axis] = value; | |
| 424 | |
| 425 /* Post the event, if desired */ | |
| 426 posted = 0; | |
| 427 #ifndef DISABLE_EVENTS | |
| 428 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { | |
| 429 SDL_Event event; | |
| 430 event.type = SDL_JOYAXISMOTION; | |
| 431 event.jaxis.which = joystick->index; | |
| 432 event.jaxis.axis = axis; | |
| 433 event.jaxis.value = value; | |
| 434 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 435 posted = 1; | |
| 436 SDL_PushEvent(&event); | |
| 437 } | |
| 438 } | |
| 439 #endif /* !DISABLE_EVENTS */ | |
| 440 return(posted); | |
| 441 } | |
| 442 | |
| 443 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 444 { | |
| 445 int posted; | |
| 446 | |
| 447 /* Update internal joystick state */ | |
| 448 joystick->hats[hat] = value; | |
| 449 | |
| 450 /* Post the event, if desired */ | |
| 451 posted = 0; | |
| 452 #ifndef DISABLE_EVENTS | |
| 453 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { | |
| 454 SDL_Event event; | |
| 455 event.jhat.type = SDL_JOYHATMOTION; | |
| 456 event.jhat.which = joystick->index; | |
| 457 event.jhat.hat = hat; | |
| 458 event.jhat.value = value; | |
| 459 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 460 posted = 1; | |
| 461 SDL_PushEvent(&event); | |
| 462 } | |
| 463 } | |
| 464 #endif /* !DISABLE_EVENTS */ | |
| 465 return(posted); | |
| 466 } | |
| 467 | |
| 468 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 469 Sint16 xrel, Sint16 yrel) | |
| 470 { | |
| 471 int posted; | |
| 472 | |
| 473 /* Update internal mouse state */ | |
| 474 joystick->balls[ball].dx += xrel; | |
| 475 joystick->balls[ball].dy += yrel; | |
| 476 | |
| 477 /* Post the event, if desired */ | |
| 478 posted = 0; | |
| 479 #ifndef DISABLE_EVENTS | |
| 480 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { | |
| 481 SDL_Event event; | |
| 482 event.jball.type = SDL_JOYBALLMOTION; | |
| 483 event.jball.which = joystick->index; | |
| 484 event.jball.ball = ball; | |
| 485 event.jball.xrel = xrel; | |
| 486 event.jball.yrel = yrel; | |
| 487 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 488 posted = 1; | |
| 489 SDL_PushEvent(&event); | |
| 490 } | |
| 491 } | |
| 492 #endif /* !DISABLE_EVENTS */ | |
| 493 return(posted); | |
| 494 } | |
| 495 | |
| 496 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 497 { | |
| 498 int posted; | |
| 499 #ifndef DISABLE_EVENTS | |
| 500 SDL_Event event; | |
| 501 | |
| 502 switch ( state ) { | |
| 503 case SDL_PRESSED: | |
| 504 event.type = SDL_JOYBUTTONDOWN; | |
| 505 break; | |
| 506 case SDL_RELEASED: | |
| 507 event.type = SDL_JOYBUTTONUP; | |
| 508 break; | |
| 509 default: | |
| 510 /* Invalid state -- bail */ | |
| 511 return(0); | |
| 512 } | |
| 513 #endif /* !DISABLE_EVENTS */ | |
| 514 | |
| 515 /* Update internal joystick state */ | |
| 516 joystick->buttons[button] = state; | |
| 517 | |
| 518 /* Post the event, if desired */ | |
| 519 posted = 0; | |
| 520 #ifndef DISABLE_EVENTS | |
| 521 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 522 event.jbutton.which = joystick->index; | |
| 523 event.jbutton.button = button; | |
| 524 event.jbutton.state = state; | |
| 525 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 526 posted = 1; | |
| 527 SDL_PushEvent(&event); | |
| 528 } | |
| 529 } | |
| 530 #endif /* !DISABLE_EVENTS */ | |
| 531 return(posted); | |
| 532 } | |
| 533 | |
| 534 void SDL_JoystickUpdate(void) | |
| 535 { | |
| 536 int i; | |
| 537 | |
| 538 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 539 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 540 } | |
| 541 } | |
| 542 | |
| 543 int SDL_JoystickEventState(int state) | |
| 544 { | |
| 545 #ifdef DISABLE_EVENTS | |
| 546 return SDL_IGNORE; | |
| 547 #else | |
| 548 const Uint8 event_list[] = { | |
| 549 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 550 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 551 }; | |
| 552 int i; | |
| 553 | |
| 554 switch (state) { | |
| 555 case SDL_QUERY: | |
| 556 state = SDL_IGNORE; | |
| 557 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 558 state = SDL_EventState(event_list[i],SDL_QUERY); | |
| 559 if ( state == SDL_ENABLE ) { | |
| 560 break; | |
| 561 } | |
| 562 } | |
| 563 break; | |
| 564 default: | |
| 565 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 566 SDL_EventState(event_list[i], state); | |
| 567 } | |
| 568 break; | |
| 569 } | |
| 570 return(state); | |
| 571 #endif /* DISABLE_EVENTS */ | |
| 572 } |