Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 1066:671bbd773c8a
Resize window to fit asked video mode
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 02 Jun 2005 22:02:18 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This is the joystick API for Simple DirectMedia Layer */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_events.h" | |
| 36 #ifndef DISABLE_EVENTS | |
| 37 #include "SDL_events_c.h" | |
| 38 #endif | |
| 39 #include "SDL_joystick_c.h" | |
| 40 #include "SDL_sysjoystick.h" | |
| 41 | |
| 42 /* This is used for Quake III Arena */ | |
| 43 #ifdef DISABLE_EVENTS | |
| 44 #define SDL_Lock_EventThread() | |
| 45 #define SDL_Unlock_EventThread() | |
| 46 #endif | |
| 47 | |
| 48 Uint8 SDL_numjoysticks = 0; | |
| 49 SDL_Joystick **SDL_joysticks = NULL; | |
| 50 static SDL_Joystick *default_joystick = NULL; | |
| 51 | |
| 52 int SDL_JoystickInit(void) | |
| 53 { | |
| 54 int arraylen; | |
| 55 int status; | |
| 56 | |
| 57 SDL_numjoysticks = 0; | |
| 58 status = SDL_SYS_JoystickInit(); | |
| 59 if ( status >= 0 ) { | |
| 60 arraylen = (status+1)*sizeof(*SDL_joysticks); | |
| 61 SDL_joysticks = (SDL_Joystick **)malloc(arraylen); | |
| 62 if ( SDL_joysticks == NULL ) { | |
| 63 SDL_numjoysticks = 0; | |
| 64 } else { | |
| 65 memset(SDL_joysticks, 0, arraylen); | |
|
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SDL_JoystickInit: If malloc() fails, pretend no joysticks were detected.
Ryan C. Gordon <icculus@icculus.org>
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66 SDL_numjoysticks = status; |
| 0 | 67 } |
| 68 status = 0; | |
| 69 } | |
| 70 default_joystick = NULL; | |
| 71 return(status); | |
| 72 } | |
| 73 | |
| 74 /* | |
| 75 * Count the number of joysticks attached to the system | |
| 76 */ | |
| 77 int SDL_NumJoysticks(void) | |
| 78 { | |
| 79 return SDL_numjoysticks; | |
| 80 } | |
| 81 | |
| 82 /* | |
| 83 * Get the implementation dependent name of a joystick | |
| 84 */ | |
| 85 const char *SDL_JoystickName(int device_index) | |
| 86 { | |
| 87 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 88 SDL_SetError("There are %d joysticks available", | |
| 89 SDL_numjoysticks); | |
| 90 return(NULL); | |
| 91 } | |
| 92 return(SDL_SYS_JoystickName(device_index)); | |
| 93 } | |
| 94 | |
| 95 /* | |
| 96 * Open a joystick for use - the index passed as an argument refers to | |
| 97 * the N'th joystick on the system. This index is the value which will | |
| 98 * identify this joystick in future joystick events. | |
| 99 * | |
| 100 * This function returns a joystick identifier, or NULL if an error occurred. | |
| 101 */ | |
| 102 SDL_Joystick *SDL_JoystickOpen(int device_index) | |
| 103 { | |
| 104 int i; | |
| 105 SDL_Joystick *joystick; | |
| 106 | |
| 107 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 108 SDL_SetError("There are %d joysticks available", | |
| 109 SDL_numjoysticks); | |
| 110 return(NULL); | |
| 111 } | |
| 112 | |
| 113 /* If the joystick is already open, return it */ | |
| 114 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 115 if ( device_index == SDL_joysticks[i]->index ) { | |
| 116 joystick = SDL_joysticks[i]; | |
| 117 ++joystick->ref_count; | |
| 118 return(joystick); | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 /* Create and initialize the joystick */ | |
| 123 joystick = (SDL_Joystick *)malloc((sizeof *joystick)); | |
| 124 if ( joystick != NULL ) { | |
| 125 memset(joystick, 0, (sizeof *joystick)); | |
| 126 joystick->index = device_index; | |
| 127 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { | |
| 128 free(joystick); | |
| 129 joystick = NULL; | |
| 130 } else { | |
| 131 if ( joystick->naxes > 0 ) { | |
| 132 joystick->axes = (Sint16 *)malloc | |
| 133 (joystick->naxes*sizeof(Sint16)); | |
| 134 } | |
| 135 if ( joystick->nhats > 0 ) { | |
| 136 joystick->hats = (Uint8 *)malloc | |
| 137 (joystick->nhats*sizeof(Uint8)); | |
| 138 } | |
| 139 if ( joystick->nballs > 0 ) { | |
| 140 joystick->balls = (struct balldelta *)malloc | |
| 141 (joystick->nballs*sizeof(*joystick->balls)); | |
| 142 } | |
| 143 if ( joystick->nbuttons > 0 ) { | |
| 144 joystick->buttons = (Uint8 *)malloc | |
| 145 (joystick->nbuttons*sizeof(Uint8)); | |
| 146 } | |
| 147 if ( ((joystick->naxes > 0) && !joystick->axes) | |
| 148 || ((joystick->nhats > 0) && !joystick->hats) | |
| 149 || ((joystick->nballs > 0) && !joystick->balls) | |
| 150 || ((joystick->nbuttons > 0) && !joystick->buttons)) { | |
| 151 SDL_OutOfMemory(); | |
| 152 SDL_JoystickClose(joystick); | |
| 153 joystick = NULL; | |
| 154 } | |
| 155 if ( joystick->axes ) { | |
| 156 memset(joystick->axes, 0, | |
| 157 joystick->naxes*sizeof(Sint16)); | |
| 158 } | |
| 159 if ( joystick->hats ) { | |
| 160 memset(joystick->hats, 0, | |
| 161 joystick->nhats*sizeof(Uint8)); | |
| 162 } | |
| 163 if ( joystick->balls ) { | |
| 164 memset(joystick->balls, 0, | |
| 165 joystick->nballs*sizeof(*joystick->balls)); | |
| 166 } | |
| 167 if ( joystick->buttons ) { | |
| 168 memset(joystick->buttons, 0, | |
| 169 joystick->nbuttons*sizeof(Uint8)); | |
| 170 } | |
| 171 } | |
| 172 } | |
| 173 if ( joystick ) { | |
| 174 /* Add joystick to list */ | |
| 175 ++joystick->ref_count; | |
| 176 SDL_Lock_EventThread(); | |
| 177 for ( i=0; SDL_joysticks[i]; ++i ) | |
| 178 /* Skip to next joystick */; | |
| 179 SDL_joysticks[i] = joystick; | |
| 180 SDL_Unlock_EventThread(); | |
| 181 } | |
| 182 return(joystick); | |
| 183 } | |
| 184 | |
| 185 /* | |
| 186 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 187 */ | |
| 188 int SDL_JoystickOpened(int device_index) | |
| 189 { | |
| 190 int i, opened; | |
| 191 | |
| 192 opened = 0; | |
| 193 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 194 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 195 opened = 1; | |
| 196 break; | |
| 197 } | |
| 198 } | |
| 199 return(opened); | |
| 200 } | |
| 201 | |
| 202 static int ValidJoystick(SDL_Joystick **joystick) | |
| 203 { | |
| 204 int valid; | |
| 205 | |
| 206 if ( *joystick == NULL ) { | |
| 207 *joystick = default_joystick; | |
| 208 } | |
| 209 if ( *joystick == NULL ) { | |
| 210 SDL_SetError("Joystick hasn't been opened yet"); | |
| 211 valid = 0; | |
| 212 } else { | |
| 213 valid = 1; | |
| 214 } | |
| 215 return valid; | |
| 216 } | |
| 217 | |
| 218 /* | |
| 219 * Get the device index of an opened joystick. | |
| 220 */ | |
| 221 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 222 { | |
| 223 if ( ! ValidJoystick(&joystick) ) { | |
| 224 return(-1); | |
| 225 } | |
| 226 return(joystick->index); | |
| 227 } | |
| 228 | |
| 229 /* | |
| 230 * Get the number of multi-dimensional axis controls on a joystick | |
| 231 */ | |
| 232 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 233 { | |
| 234 if ( ! ValidJoystick(&joystick) ) { | |
| 235 return(-1); | |
| 236 } | |
| 237 return(joystick->naxes); | |
| 238 } | |
| 239 | |
| 240 /* | |
| 241 * Get the number of hats on a joystick | |
| 242 */ | |
| 243 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 244 { | |
| 245 if ( ! ValidJoystick(&joystick) ) { | |
| 246 return(-1); | |
| 247 } | |
| 248 return(joystick->nhats); | |
| 249 } | |
| 250 | |
| 251 /* | |
| 252 * Get the number of trackballs on a joystick | |
| 253 */ | |
| 254 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 255 { | |
| 256 if ( ! ValidJoystick(&joystick) ) { | |
| 257 return(-1); | |
| 258 } | |
| 259 return(joystick->nballs); | |
| 260 } | |
| 261 | |
| 262 /* | |
| 263 * Get the number of buttons on a joystick | |
| 264 */ | |
| 265 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 266 { | |
| 267 if ( ! ValidJoystick(&joystick) ) { | |
| 268 return(-1); | |
| 269 } | |
| 270 return(joystick->nbuttons); | |
| 271 } | |
| 272 | |
| 273 /* | |
| 274 * Get the current state of an axis control on a joystick | |
| 275 */ | |
| 276 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 277 { | |
| 278 Sint16 state; | |
| 279 | |
| 280 if ( ! ValidJoystick(&joystick) ) { | |
| 281 return(0); | |
| 282 } | |
| 283 if ( axis < joystick->naxes ) { | |
| 284 state = joystick->axes[axis]; | |
| 285 } else { | |
| 286 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 287 state = 0; | |
| 288 } | |
| 289 return(state); | |
| 290 } | |
| 291 | |
| 292 /* | |
| 293 * Get the current state of a hat on a joystick | |
| 294 */ | |
| 295 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 296 { | |
| 297 Uint8 state; | |
| 298 | |
| 299 if ( ! ValidJoystick(&joystick) ) { | |
| 300 return(0); | |
| 301 } | |
| 302 if ( hat < joystick->nhats ) { | |
| 303 state = joystick->hats[hat]; | |
| 304 } else { | |
| 305 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 306 state = 0; | |
| 307 } | |
| 308 return(state); | |
| 309 } | |
| 310 | |
| 311 /* | |
| 312 * Get the ball axis change since the last poll | |
| 313 */ | |
| 314 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 315 { | |
| 316 int retval; | |
| 317 | |
| 318 if ( ! ValidJoystick(&joystick) ) { | |
| 319 return(-1); | |
| 320 } | |
| 321 | |
| 322 retval = 0; | |
| 323 if ( ball < joystick->nballs ) { | |
| 324 if ( dx ) { | |
| 325 *dx = joystick->balls[ball].dx; | |
| 326 } | |
| 327 if ( dy ) { | |
| 328 *dy = joystick->balls[ball].dy; | |
| 329 } | |
| 330 joystick->balls[ball].dx = 0; | |
| 331 joystick->balls[ball].dy = 0; | |
| 332 } else { | |
| 333 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 334 retval = -1; | |
| 335 } | |
| 336 return(retval); | |
| 337 } | |
| 338 | |
| 339 /* | |
| 340 * Get the current state of a button on a joystick | |
| 341 */ | |
| 342 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 343 { | |
| 344 Uint8 state; | |
| 345 | |
| 346 if ( ! ValidJoystick(&joystick) ) { | |
| 347 return(0); | |
| 348 } | |
| 349 if ( button < joystick->nbuttons ) { | |
| 350 state = joystick->buttons[button]; | |
| 351 } else { | |
| 352 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 353 state = 0; | |
| 354 } | |
| 355 return(state); | |
| 356 } | |
| 357 | |
| 358 /* | |
| 359 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 360 */ | |
| 361 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 362 { | |
| 363 int i; | |
| 364 | |
| 365 if ( ! ValidJoystick(&joystick) ) { | |
| 366 return; | |
| 367 } | |
| 368 | |
| 369 /* First decrement ref count */ | |
| 370 if ( --joystick->ref_count > 0 ) { | |
| 371 return; | |
| 372 } | |
| 373 | |
| 374 /* Lock the event queue - prevent joystick polling */ | |
| 375 SDL_Lock_EventThread(); | |
| 376 | |
| 377 if ( joystick == default_joystick ) { | |
| 378 default_joystick = NULL; | |
| 379 } | |
| 380 SDL_SYS_JoystickClose(joystick); | |
| 381 | |
| 382 /* Remove joystick from list */ | |
| 383 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 384 if ( joystick == SDL_joysticks[i] ) { | |
| 385 memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], | |
| 386 (SDL_numjoysticks-i)*sizeof(joystick)); | |
| 387 break; | |
| 388 } | |
| 389 } | |
| 390 | |
| 391 /* Let the event thread keep running */ | |
| 392 SDL_Unlock_EventThread(); | |
| 393 | |
| 394 /* Free the data associated with this joystick */ | |
| 395 if ( joystick->axes ) { | |
| 396 free(joystick->axes); | |
| 397 } | |
| 398 if ( joystick->hats ) { | |
| 399 free(joystick->hats); | |
| 400 } | |
| 401 if ( joystick->balls ) { | |
| 402 free(joystick->balls); | |
| 403 } | |
| 404 if ( joystick->buttons ) { | |
| 405 free(joystick->buttons); | |
| 406 } | |
| 407 free(joystick); | |
| 408 } | |
| 409 | |
| 410 void SDL_JoystickQuit(void) | |
| 411 { | |
| 412 /* Stop the event polling */ | |
| 413 SDL_Lock_EventThread(); | |
| 414 SDL_numjoysticks = 0; | |
| 415 SDL_Unlock_EventThread(); | |
| 416 | |
| 417 /* Quit the joystick setup */ | |
| 418 SDL_SYS_JoystickQuit(); | |
| 419 if ( SDL_joysticks ) { | |
| 420 free(SDL_joysticks); | |
| 421 SDL_joysticks = NULL; | |
| 422 } | |
| 423 } | |
| 424 | |
| 425 | |
| 426 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 427 | |
| 428 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 429 { | |
| 430 int posted; | |
| 431 | |
| 432 /* Update internal joystick state */ | |
| 433 joystick->axes[axis] = value; | |
| 434 | |
| 435 /* Post the event, if desired */ | |
| 436 posted = 0; | |
| 437 #ifndef DISABLE_EVENTS | |
| 438 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { | |
| 439 SDL_Event event; | |
| 440 event.type = SDL_JOYAXISMOTION; | |
| 441 event.jaxis.which = joystick->index; | |
| 442 event.jaxis.axis = axis; | |
| 443 event.jaxis.value = value; | |
| 444 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 445 posted = 1; | |
| 446 SDL_PushEvent(&event); | |
| 447 } | |
| 448 } | |
| 449 #endif /* !DISABLE_EVENTS */ | |
| 450 return(posted); | |
| 451 } | |
| 452 | |
| 453 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 454 { | |
| 455 int posted; | |
| 456 | |
| 457 /* Update internal joystick state */ | |
| 458 joystick->hats[hat] = value; | |
| 459 | |
| 460 /* Post the event, if desired */ | |
| 461 posted = 0; | |
| 462 #ifndef DISABLE_EVENTS | |
| 463 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { | |
| 464 SDL_Event event; | |
| 465 event.jhat.type = SDL_JOYHATMOTION; | |
| 466 event.jhat.which = joystick->index; | |
| 467 event.jhat.hat = hat; | |
| 468 event.jhat.value = value; | |
| 469 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 470 posted = 1; | |
| 471 SDL_PushEvent(&event); | |
| 472 } | |
| 473 } | |
| 474 #endif /* !DISABLE_EVENTS */ | |
| 475 return(posted); | |
| 476 } | |
| 477 | |
| 478 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 479 Sint16 xrel, Sint16 yrel) | |
| 480 { | |
| 481 int posted; | |
| 482 | |
| 483 /* Update internal mouse state */ | |
| 484 joystick->balls[ball].dx += xrel; | |
| 485 joystick->balls[ball].dy += yrel; | |
| 486 | |
| 487 /* Post the event, if desired */ | |
| 488 posted = 0; | |
| 489 #ifndef DISABLE_EVENTS | |
| 490 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { | |
| 491 SDL_Event event; | |
| 492 event.jball.type = SDL_JOYBALLMOTION; | |
| 493 event.jball.which = joystick->index; | |
| 494 event.jball.ball = ball; | |
| 495 event.jball.xrel = xrel; | |
| 496 event.jball.yrel = yrel; | |
| 497 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 498 posted = 1; | |
| 499 SDL_PushEvent(&event); | |
| 500 } | |
| 501 } | |
| 502 #endif /* !DISABLE_EVENTS */ | |
| 503 return(posted); | |
| 504 } | |
| 505 | |
| 506 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 507 { | |
| 508 int posted; | |
| 509 #ifndef DISABLE_EVENTS | |
| 510 SDL_Event event; | |
| 511 | |
| 512 switch ( state ) { | |
| 513 case SDL_PRESSED: | |
| 514 event.type = SDL_JOYBUTTONDOWN; | |
| 515 break; | |
| 516 case SDL_RELEASED: | |
| 517 event.type = SDL_JOYBUTTONUP; | |
| 518 break; | |
| 519 default: | |
| 520 /* Invalid state -- bail */ | |
| 521 return(0); | |
| 522 } | |
| 523 #endif /* !DISABLE_EVENTS */ | |
| 524 | |
| 525 /* Update internal joystick state */ | |
| 526 joystick->buttons[button] = state; | |
| 527 | |
| 528 /* Post the event, if desired */ | |
| 529 posted = 0; | |
| 530 #ifndef DISABLE_EVENTS | |
| 531 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 532 event.jbutton.which = joystick->index; | |
| 533 event.jbutton.button = button; | |
| 534 event.jbutton.state = state; | |
| 535 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 536 posted = 1; | |
| 537 SDL_PushEvent(&event); | |
| 538 } | |
| 539 } | |
| 540 #endif /* !DISABLE_EVENTS */ | |
| 541 return(posted); | |
| 542 } | |
| 543 | |
| 544 void SDL_JoystickUpdate(void) | |
| 545 { | |
| 546 int i; | |
| 547 | |
| 548 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 549 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 550 } | |
| 551 } | |
| 552 | |
| 553 int SDL_JoystickEventState(int state) | |
| 554 { | |
| 555 #ifdef DISABLE_EVENTS | |
| 556 return SDL_IGNORE; | |
| 557 #else | |
| 558 const Uint8 event_list[] = { | |
| 559 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 560 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 561 }; | |
| 562 int i; | |
| 563 | |
| 564 switch (state) { | |
| 565 case SDL_QUERY: | |
| 566 state = SDL_IGNORE; | |
| 567 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 568 state = SDL_EventState(event_list[i],SDL_QUERY); | |
| 569 if ( state == SDL_ENABLE ) { | |
| 570 break; | |
| 571 } | |
| 572 } | |
| 573 break; | |
| 574 default: | |
| 575 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) { | |
| 576 SDL_EventState(event_list[i], state); | |
| 577 } | |
| 578 break; | |
| 579 } | |
| 580 return(state); | |
| 581 #endif /* DISABLE_EVENTS */ | |
| 582 } |