Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 1336:3692456e7b0f
Use SDL_ prefixed versions of C library functions.
FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 06:59:48 +0000 |
| parents | 450721ad5436 |
| children | 604d73db6802 |
| 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_error.h" | |
| 26 #include "SDL_events.h" | |
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27 #include "SDL_stdlib.h" |
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28 #include "SDL_string.h" |
| 0 | 29 #ifndef DISABLE_EVENTS |
| 30 #include "SDL_events_c.h" | |
| 31 #endif | |
| 32 #include "SDL_joystick_c.h" | |
| 33 #include "SDL_sysjoystick.h" | |
| 34 | |
| 35 /* This is used for Quake III Arena */ | |
| 36 #ifdef DISABLE_EVENTS | |
| 37 #define SDL_Lock_EventThread() | |
| 38 #define SDL_Unlock_EventThread() | |
| 39 #endif | |
| 40 | |
| 41 Uint8 SDL_numjoysticks = 0; | |
| 42 SDL_Joystick **SDL_joysticks = NULL; | |
| 43 static SDL_Joystick *default_joystick = NULL; | |
| 44 | |
| 45 int SDL_JoystickInit(void) | |
| 46 { | |
| 47 int arraylen; | |
| 48 int status; | |
| 49 | |
| 50 SDL_numjoysticks = 0; | |
| 51 status = SDL_SYS_JoystickInit(); | |
| 52 if ( status >= 0 ) { | |
| 53 arraylen = (status+1)*sizeof(*SDL_joysticks); | |
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54 SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen); |
| 0 | 55 if ( SDL_joysticks == NULL ) { |
| 56 SDL_numjoysticks = 0; | |
| 57 } else { | |
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58 SDL_memset(SDL_joysticks, 0, arraylen); |
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59 SDL_numjoysticks = status; |
| 0 | 60 } |
| 61 status = 0; | |
| 62 } | |
| 63 default_joystick = NULL; | |
| 64 return(status); | |
| 65 } | |
| 66 | |
| 67 /* | |
| 68 * Count the number of joysticks attached to the system | |
| 69 */ | |
| 70 int SDL_NumJoysticks(void) | |
| 71 { | |
| 72 return SDL_numjoysticks; | |
| 73 } | |
| 74 | |
| 75 /* | |
| 76 * Get the implementation dependent name of a joystick | |
| 77 */ | |
| 78 const char *SDL_JoystickName(int device_index) | |
| 79 { | |
| 80 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 81 SDL_SetError("There are %d joysticks available", | |
| 82 SDL_numjoysticks); | |
| 83 return(NULL); | |
| 84 } | |
| 85 return(SDL_SYS_JoystickName(device_index)); | |
| 86 } | |
| 87 | |
| 88 /* | |
| 89 * Open a joystick for use - the index passed as an argument refers to | |
| 90 * the N'th joystick on the system. This index is the value which will | |
| 91 * identify this joystick in future joystick events. | |
| 92 * | |
| 93 * This function returns a joystick identifier, or NULL if an error occurred. | |
| 94 */ | |
| 95 SDL_Joystick *SDL_JoystickOpen(int device_index) | |
| 96 { | |
| 97 int i; | |
| 98 SDL_Joystick *joystick; | |
| 99 | |
| 100 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 101 SDL_SetError("There are %d joysticks available", | |
| 102 SDL_numjoysticks); | |
| 103 return(NULL); | |
| 104 } | |
| 105 | |
| 106 /* If the joystick is already open, return it */ | |
| 107 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 108 if ( device_index == SDL_joysticks[i]->index ) { | |
| 109 joystick = SDL_joysticks[i]; | |
| 110 ++joystick->ref_count; | |
| 111 return(joystick); | |
| 112 } | |
| 113 } | |
| 114 | |
| 115 /* Create and initialize the joystick */ | |
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116 joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick)); |
| 0 | 117 if ( joystick != NULL ) { |
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118 SDL_memset(joystick, 0, (sizeof *joystick)); |
| 0 | 119 joystick->index = device_index; |
| 120 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { | |
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121 SDL_free(joystick); |
| 0 | 122 joystick = NULL; |
| 123 } else { | |
| 124 if ( joystick->naxes > 0 ) { | |
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125 joystick->axes = (Sint16 *)SDL_malloc |
| 0 | 126 (joystick->naxes*sizeof(Sint16)); |
| 127 } | |
| 128 if ( joystick->nhats > 0 ) { | |
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129 joystick->hats = (Uint8 *)SDL_malloc |
| 0 | 130 (joystick->nhats*sizeof(Uint8)); |
| 131 } | |
| 132 if ( joystick->nballs > 0 ) { | |
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133 joystick->balls = (struct balldelta *)SDL_malloc |
| 0 | 134 (joystick->nballs*sizeof(*joystick->balls)); |
| 135 } | |
| 136 if ( joystick->nbuttons > 0 ) { | |
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137 joystick->buttons = (Uint8 *)SDL_malloc |
| 0 | 138 (joystick->nbuttons*sizeof(Uint8)); |
| 139 } | |
| 140 if ( ((joystick->naxes > 0) && !joystick->axes) | |
| 141 || ((joystick->nhats > 0) && !joystick->hats) | |
| 142 || ((joystick->nballs > 0) && !joystick->balls) | |
| 143 || ((joystick->nbuttons > 0) && !joystick->buttons)) { | |
| 144 SDL_OutOfMemory(); | |
| 145 SDL_JoystickClose(joystick); | |
| 146 joystick = NULL; | |
| 147 } | |
| 148 if ( joystick->axes ) { | |
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149 SDL_memset(joystick->axes, 0, |
| 0 | 150 joystick->naxes*sizeof(Sint16)); |
| 151 } | |
| 152 if ( joystick->hats ) { | |
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153 SDL_memset(joystick->hats, 0, |
| 0 | 154 joystick->nhats*sizeof(Uint8)); |
| 155 } | |
| 156 if ( joystick->balls ) { | |
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157 SDL_memset(joystick->balls, 0, |
| 0 | 158 joystick->nballs*sizeof(*joystick->balls)); |
| 159 } | |
| 160 if ( joystick->buttons ) { | |
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161 SDL_memset(joystick->buttons, 0, |
| 0 | 162 joystick->nbuttons*sizeof(Uint8)); |
| 163 } | |
| 164 } | |
| 165 } | |
| 166 if ( joystick ) { | |
| 167 /* Add joystick to list */ | |
| 168 ++joystick->ref_count; | |
| 169 SDL_Lock_EventThread(); | |
| 170 for ( i=0; SDL_joysticks[i]; ++i ) | |
| 171 /* Skip to next joystick */; | |
| 172 SDL_joysticks[i] = joystick; | |
| 173 SDL_Unlock_EventThread(); | |
| 174 } | |
| 175 return(joystick); | |
| 176 } | |
| 177 | |
| 178 /* | |
| 179 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 180 */ | |
| 181 int SDL_JoystickOpened(int device_index) | |
| 182 { | |
| 183 int i, opened; | |
| 184 | |
| 185 opened = 0; | |
| 186 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 187 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 188 opened = 1; | |
| 189 break; | |
| 190 } | |
| 191 } | |
| 192 return(opened); | |
| 193 } | |
| 194 | |
| 195 static int ValidJoystick(SDL_Joystick **joystick) | |
| 196 { | |
| 197 int valid; | |
| 198 | |
| 199 if ( *joystick == NULL ) { | |
| 200 *joystick = default_joystick; | |
| 201 } | |
| 202 if ( *joystick == NULL ) { | |
| 203 SDL_SetError("Joystick hasn't been opened yet"); | |
| 204 valid = 0; | |
| 205 } else { | |
| 206 valid = 1; | |
| 207 } | |
| 208 return valid; | |
| 209 } | |
| 210 | |
| 211 /* | |
| 212 * Get the device index of an opened joystick. | |
| 213 */ | |
| 214 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 215 { | |
| 216 if ( ! ValidJoystick(&joystick) ) { | |
| 217 return(-1); | |
| 218 } | |
| 219 return(joystick->index); | |
| 220 } | |
| 221 | |
| 222 /* | |
| 223 * Get the number of multi-dimensional axis controls on a joystick | |
| 224 */ | |
| 225 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 226 { | |
| 227 if ( ! ValidJoystick(&joystick) ) { | |
| 228 return(-1); | |
| 229 } | |
| 230 return(joystick->naxes); | |
| 231 } | |
| 232 | |
| 233 /* | |
| 234 * Get the number of hats on a joystick | |
| 235 */ | |
| 236 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 237 { | |
| 238 if ( ! ValidJoystick(&joystick) ) { | |
| 239 return(-1); | |
| 240 } | |
| 241 return(joystick->nhats); | |
| 242 } | |
| 243 | |
| 244 /* | |
| 245 * Get the number of trackballs on a joystick | |
| 246 */ | |
| 247 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 248 { | |
| 249 if ( ! ValidJoystick(&joystick) ) { | |
| 250 return(-1); | |
| 251 } | |
| 252 return(joystick->nballs); | |
| 253 } | |
| 254 | |
| 255 /* | |
| 256 * Get the number of buttons on a joystick | |
| 257 */ | |
| 258 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 259 { | |
| 260 if ( ! ValidJoystick(&joystick) ) { | |
| 261 return(-1); | |
| 262 } | |
| 263 return(joystick->nbuttons); | |
| 264 } | |
| 265 | |
| 266 /* | |
| 267 * Get the current state of an axis control on a joystick | |
| 268 */ | |
| 269 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 270 { | |
| 271 Sint16 state; | |
| 272 | |
| 273 if ( ! ValidJoystick(&joystick) ) { | |
| 274 return(0); | |
| 275 } | |
| 276 if ( axis < joystick->naxes ) { | |
| 277 state = joystick->axes[axis]; | |
| 278 } else { | |
| 279 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 280 state = 0; | |
| 281 } | |
| 282 return(state); | |
| 283 } | |
| 284 | |
| 285 /* | |
| 286 * Get the current state of a hat on a joystick | |
| 287 */ | |
| 288 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 289 { | |
| 290 Uint8 state; | |
| 291 | |
| 292 if ( ! ValidJoystick(&joystick) ) { | |
| 293 return(0); | |
| 294 } | |
| 295 if ( hat < joystick->nhats ) { | |
| 296 state = joystick->hats[hat]; | |
| 297 } else { | |
| 298 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 299 state = 0; | |
| 300 } | |
| 301 return(state); | |
| 302 } | |
| 303 | |
| 304 /* | |
| 305 * Get the ball axis change since the last poll | |
| 306 */ | |
| 307 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 308 { | |
| 309 int retval; | |
| 310 | |
| 311 if ( ! ValidJoystick(&joystick) ) { | |
| 312 return(-1); | |
| 313 } | |
| 314 | |
| 315 retval = 0; | |
| 316 if ( ball < joystick->nballs ) { | |
| 317 if ( dx ) { | |
| 318 *dx = joystick->balls[ball].dx; | |
| 319 } | |
| 320 if ( dy ) { | |
| 321 *dy = joystick->balls[ball].dy; | |
| 322 } | |
| 323 joystick->balls[ball].dx = 0; | |
| 324 joystick->balls[ball].dy = 0; | |
| 325 } else { | |
| 326 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 327 retval = -1; | |
| 328 } | |
| 329 return(retval); | |
| 330 } | |
| 331 | |
| 332 /* | |
| 333 * Get the current state of a button on a joystick | |
| 334 */ | |
| 335 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 336 { | |
| 337 Uint8 state; | |
| 338 | |
| 339 if ( ! ValidJoystick(&joystick) ) { | |
| 340 return(0); | |
| 341 } | |
| 342 if ( button < joystick->nbuttons ) { | |
| 343 state = joystick->buttons[button]; | |
| 344 } else { | |
| 345 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 346 state = 0; | |
| 347 } | |
| 348 return(state); | |
| 349 } | |
| 350 | |
| 351 /* | |
| 352 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 353 */ | |
| 354 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 355 { | |
| 356 int i; | |
| 357 | |
| 358 if ( ! ValidJoystick(&joystick) ) { | |
| 359 return; | |
| 360 } | |
| 361 | |
| 362 /* First decrement ref count */ | |
| 363 if ( --joystick->ref_count > 0 ) { | |
| 364 return; | |
| 365 } | |
| 366 | |
| 367 /* Lock the event queue - prevent joystick polling */ | |
| 368 SDL_Lock_EventThread(); | |
| 369 | |
| 370 if ( joystick == default_joystick ) { | |
| 371 default_joystick = NULL; | |
| 372 } | |
| 373 SDL_SYS_JoystickClose(joystick); | |
| 374 | |
| 375 /* Remove joystick from list */ | |
| 376 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 377 if ( joystick == SDL_joysticks[i] ) { | |
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378 SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], |
| 0 | 379 (SDL_numjoysticks-i)*sizeof(joystick)); |
| 380 break; | |
| 381 } | |
| 382 } | |
| 383 | |
| 384 /* Let the event thread keep running */ | |
| 385 SDL_Unlock_EventThread(); | |
| 386 | |
| 387 /* Free the data associated with this joystick */ | |
| 388 if ( joystick->axes ) { | |
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389 SDL_free(joystick->axes); |
| 0 | 390 } |
| 391 if ( joystick->hats ) { | |
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392 SDL_free(joystick->hats); |
| 0 | 393 } |
| 394 if ( joystick->balls ) { | |
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395 SDL_free(joystick->balls); |
| 0 | 396 } |
| 397 if ( joystick->buttons ) { | |
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398 SDL_free(joystick->buttons); |
| 0 | 399 } |
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400 SDL_free(joystick); |
| 0 | 401 } |
| 402 | |
| 403 void SDL_JoystickQuit(void) | |
| 404 { | |
| 405 /* Stop the event polling */ | |
| 406 SDL_Lock_EventThread(); | |
| 407 SDL_numjoysticks = 0; | |
| 408 SDL_Unlock_EventThread(); | |
| 409 | |
| 410 /* Quit the joystick setup */ | |
| 411 SDL_SYS_JoystickQuit(); | |
| 412 if ( SDL_joysticks ) { | |
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413 SDL_free(SDL_joysticks); |
| 0 | 414 SDL_joysticks = NULL; |
| 415 } | |
| 416 } | |
| 417 | |
| 418 | |
| 419 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 420 | |
| 421 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 422 { | |
| 423 int posted; | |
| 424 | |
| 425 /* Update internal joystick state */ | |
| 426 joystick->axes[axis] = value; | |
| 427 | |
| 428 /* Post the event, if desired */ | |
| 429 posted = 0; | |
| 430 #ifndef DISABLE_EVENTS | |
| 431 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { | |
| 432 SDL_Event event; | |
| 433 event.type = SDL_JOYAXISMOTION; | |
| 434 event.jaxis.which = joystick->index; | |
| 435 event.jaxis.axis = axis; | |
| 436 event.jaxis.value = value; | |
| 437 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 438 posted = 1; | |
| 439 SDL_PushEvent(&event); | |
| 440 } | |
| 441 } | |
| 442 #endif /* !DISABLE_EVENTS */ | |
| 443 return(posted); | |
| 444 } | |
| 445 | |
| 446 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 447 { | |
| 448 int posted; | |
| 449 | |
| 450 /* Update internal joystick state */ | |
| 451 joystick->hats[hat] = value; | |
| 452 | |
| 453 /* Post the event, if desired */ | |
| 454 posted = 0; | |
| 455 #ifndef DISABLE_EVENTS | |
| 456 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { | |
| 457 SDL_Event event; | |
| 458 event.jhat.type = SDL_JOYHATMOTION; | |
| 459 event.jhat.which = joystick->index; | |
| 460 event.jhat.hat = hat; | |
| 461 event.jhat.value = value; | |
| 462 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 463 posted = 1; | |
| 464 SDL_PushEvent(&event); | |
| 465 } | |
| 466 } | |
| 467 #endif /* !DISABLE_EVENTS */ | |
| 468 return(posted); | |
| 469 } | |
| 470 | |
| 471 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 472 Sint16 xrel, Sint16 yrel) | |
| 473 { | |
| 474 int posted; | |
| 475 | |
| 476 /* Update internal mouse state */ | |
| 477 joystick->balls[ball].dx += xrel; | |
| 478 joystick->balls[ball].dy += yrel; | |
| 479 | |
| 480 /* Post the event, if desired */ | |
| 481 posted = 0; | |
| 482 #ifndef DISABLE_EVENTS | |
| 483 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { | |
| 484 SDL_Event event; | |
| 485 event.jball.type = SDL_JOYBALLMOTION; | |
| 486 event.jball.which = joystick->index; | |
| 487 event.jball.ball = ball; | |
| 488 event.jball.xrel = xrel; | |
| 489 event.jball.yrel = yrel; | |
| 490 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 491 posted = 1; | |
| 492 SDL_PushEvent(&event); | |
| 493 } | |
| 494 } | |
| 495 #endif /* !DISABLE_EVENTS */ | |
| 496 return(posted); | |
| 497 } | |
| 498 | |
| 499 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 500 { | |
| 501 int posted; | |
| 502 #ifndef DISABLE_EVENTS | |
| 503 SDL_Event event; | |
| 504 | |
| 505 switch ( state ) { | |
| 506 case SDL_PRESSED: | |
| 507 event.type = SDL_JOYBUTTONDOWN; | |
| 508 break; | |
| 509 case SDL_RELEASED: | |
| 510 event.type = SDL_JOYBUTTONUP; | |
| 511 break; | |
| 512 default: | |
| 513 /* Invalid state -- bail */ | |
| 514 return(0); | |
| 515 } | |
| 516 #endif /* !DISABLE_EVENTS */ | |
| 517 | |
| 518 /* Update internal joystick state */ | |
| 519 joystick->buttons[button] = state; | |
| 520 | |
| 521 /* Post the event, if desired */ | |
| 522 posted = 0; | |
| 523 #ifndef DISABLE_EVENTS | |
| 524 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 525 event.jbutton.which = joystick->index; | |
| 526 event.jbutton.button = button; | |
| 527 event.jbutton.state = state; | |
| 528 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 529 posted = 1; | |
| 530 SDL_PushEvent(&event); | |
| 531 } | |
| 532 } | |
| 533 #endif /* !DISABLE_EVENTS */ | |
| 534 return(posted); | |
| 535 } | |
| 536 | |
| 537 void SDL_JoystickUpdate(void) | |
| 538 { | |
| 539 int i; | |
| 540 | |
| 541 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 542 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 int SDL_JoystickEventState(int state) | |
| 547 { | |
| 548 #ifdef DISABLE_EVENTS | |
| 549 return SDL_IGNORE; | |
| 550 #else | |
| 551 const Uint8 event_list[] = { | |
| 552 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 553 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 554 }; | |
| 555 int i; | |
| 556 | |
| 557 switch (state) { | |
| 558 case SDL_QUERY: | |
| 559 state = SDL_IGNORE; | |
| 560 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 561 state = SDL_EventState(event_list[i],SDL_QUERY); | |
| 562 if ( state == SDL_ENABLE ) { | |
| 563 break; | |
| 564 } | |
| 565 } | |
| 566 break; | |
| 567 default: | |
| 568 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 569 SDL_EventState(event_list[i], state); | |
| 570 } | |
| 571 break; | |
| 572 } | |
| 573 return(state); | |
| 574 #endif /* DISABLE_EVENTS */ | |
| 575 } |