Mercurial > sdl-ios-xcode
annotate src/joystick/SDL_joystick.c @ 1616:9f836cec0521
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 31 Mar 2006 06:30:16 +0000 |
| parents | 97d0966f4bf7 |
| children | 782fd950bd46 c121d94672cb 6bdec986f2f6 |
| 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 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* This is the joystick API for Simple DirectMedia Layer */ | |
| 25 | |
| 26 #include "SDL_events.h" | |
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27 #include "SDL_sysjoystick.h" |
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28 #include "SDL_joystick_c.h" |
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29 #if !SDL_EVENTS_DISABLED |
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30 #include "../events/SDL_events_c.h" |
| 0 | 31 #endif |
| 32 | |
| 33 /* This is used for Quake III Arena */ | |
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34 #if SDL_EVENTS_DISABLED |
| 0 | 35 #define SDL_Lock_EventThread() |
| 36 #define SDL_Unlock_EventThread() | |
| 37 #endif | |
| 38 | |
| 39 Uint8 SDL_numjoysticks = 0; | |
| 40 SDL_Joystick **SDL_joysticks = NULL; | |
| 41 static SDL_Joystick *default_joystick = NULL; | |
| 42 | |
| 43 int SDL_JoystickInit(void) | |
| 44 { | |
| 45 int arraylen; | |
| 46 int status; | |
| 47 | |
| 48 SDL_numjoysticks = 0; | |
| 49 status = SDL_SYS_JoystickInit(); | |
| 50 if ( status >= 0 ) { | |
| 51 arraylen = (status+1)*sizeof(*SDL_joysticks); | |
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52 SDL_joysticks = (SDL_Joystick **)SDL_malloc(arraylen); |
| 0 | 53 if ( SDL_joysticks == NULL ) { |
| 54 SDL_numjoysticks = 0; | |
| 55 } else { | |
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56 SDL_memset(SDL_joysticks, 0, arraylen); |
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57 SDL_numjoysticks = status; |
| 0 | 58 } |
| 59 status = 0; | |
| 60 } | |
| 61 default_joystick = NULL; | |
| 62 return(status); | |
| 63 } | |
| 64 | |
| 65 /* | |
| 66 * Count the number of joysticks attached to the system | |
| 67 */ | |
| 68 int SDL_NumJoysticks(void) | |
| 69 { | |
| 70 return SDL_numjoysticks; | |
| 71 } | |
| 72 | |
| 73 /* | |
| 74 * Get the implementation dependent name of a joystick | |
| 75 */ | |
| 76 const char *SDL_JoystickName(int device_index) | |
| 77 { | |
| 78 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 79 SDL_SetError("There are %d joysticks available", | |
| 80 SDL_numjoysticks); | |
| 81 return(NULL); | |
| 82 } | |
| 83 return(SDL_SYS_JoystickName(device_index)); | |
| 84 } | |
| 85 | |
| 86 /* | |
| 87 * Open a joystick for use - the index passed as an argument refers to | |
| 88 * the N'th joystick on the system. This index is the value which will | |
| 89 * identify this joystick in future joystick events. | |
| 90 * | |
| 91 * This function returns a joystick identifier, or NULL if an error occurred. | |
| 92 */ | |
| 93 SDL_Joystick *SDL_JoystickOpen(int device_index) | |
| 94 { | |
| 95 int i; | |
| 96 SDL_Joystick *joystick; | |
| 97 | |
| 98 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) { | |
| 99 SDL_SetError("There are %d joysticks available", | |
| 100 SDL_numjoysticks); | |
| 101 return(NULL); | |
| 102 } | |
| 103 | |
| 104 /* If the joystick is already open, return it */ | |
| 105 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 106 if ( device_index == SDL_joysticks[i]->index ) { | |
| 107 joystick = SDL_joysticks[i]; | |
| 108 ++joystick->ref_count; | |
| 109 return(joystick); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 /* Create and initialize the joystick */ | |
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114 joystick = (SDL_Joystick *)SDL_malloc((sizeof *joystick)); |
| 0 | 115 if ( joystick != NULL ) { |
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116 SDL_memset(joystick, 0, (sizeof *joystick)); |
| 0 | 117 joystick->index = device_index; |
| 118 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) { | |
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119 SDL_free(joystick); |
| 0 | 120 joystick = NULL; |
| 121 } else { | |
| 122 if ( joystick->naxes > 0 ) { | |
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123 joystick->axes = (Sint16 *)SDL_malloc |
| 0 | 124 (joystick->naxes*sizeof(Sint16)); |
| 125 } | |
| 126 if ( joystick->nhats > 0 ) { | |
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127 joystick->hats = (Uint8 *)SDL_malloc |
| 0 | 128 (joystick->nhats*sizeof(Uint8)); |
| 129 } | |
| 130 if ( joystick->nballs > 0 ) { | |
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131 joystick->balls = (struct balldelta *)SDL_malloc |
| 0 | 132 (joystick->nballs*sizeof(*joystick->balls)); |
| 133 } | |
| 134 if ( joystick->nbuttons > 0 ) { | |
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135 joystick->buttons = (Uint8 *)SDL_malloc |
| 0 | 136 (joystick->nbuttons*sizeof(Uint8)); |
| 137 } | |
| 138 if ( ((joystick->naxes > 0) && !joystick->axes) | |
| 139 || ((joystick->nhats > 0) && !joystick->hats) | |
| 140 || ((joystick->nballs > 0) && !joystick->balls) | |
| 141 || ((joystick->nbuttons > 0) && !joystick->buttons)) { | |
| 142 SDL_OutOfMemory(); | |
| 143 SDL_JoystickClose(joystick); | |
| 144 joystick = NULL; | |
| 145 } | |
| 146 if ( joystick->axes ) { | |
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147 SDL_memset(joystick->axes, 0, |
| 0 | 148 joystick->naxes*sizeof(Sint16)); |
| 149 } | |
| 150 if ( joystick->hats ) { | |
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151 SDL_memset(joystick->hats, 0, |
| 0 | 152 joystick->nhats*sizeof(Uint8)); |
| 153 } | |
| 154 if ( joystick->balls ) { | |
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155 SDL_memset(joystick->balls, 0, |
| 0 | 156 joystick->nballs*sizeof(*joystick->balls)); |
| 157 } | |
| 158 if ( joystick->buttons ) { | |
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159 SDL_memset(joystick->buttons, 0, |
| 0 | 160 joystick->nbuttons*sizeof(Uint8)); |
| 161 } | |
| 162 } | |
| 163 } | |
| 164 if ( joystick ) { | |
| 165 /* Add joystick to list */ | |
| 166 ++joystick->ref_count; | |
| 167 SDL_Lock_EventThread(); | |
| 168 for ( i=0; SDL_joysticks[i]; ++i ) | |
| 169 /* Skip to next joystick */; | |
| 170 SDL_joysticks[i] = joystick; | |
| 171 SDL_Unlock_EventThread(); | |
| 172 } | |
| 173 return(joystick); | |
| 174 } | |
| 175 | |
| 176 /* | |
| 177 * Returns 1 if the joystick has been opened, or 0 if it has not. | |
| 178 */ | |
| 179 int SDL_JoystickOpened(int device_index) | |
| 180 { | |
| 181 int i, opened; | |
| 182 | |
| 183 opened = 0; | |
| 184 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 185 if ( SDL_joysticks[i]->index == (Uint8)device_index ) { | |
| 186 opened = 1; | |
| 187 break; | |
| 188 } | |
| 189 } | |
| 190 return(opened); | |
| 191 } | |
| 192 | |
| 193 static int ValidJoystick(SDL_Joystick **joystick) | |
| 194 { | |
| 195 int valid; | |
| 196 | |
| 197 if ( *joystick == NULL ) { | |
| 198 *joystick = default_joystick; | |
| 199 } | |
| 200 if ( *joystick == NULL ) { | |
| 201 SDL_SetError("Joystick hasn't been opened yet"); | |
| 202 valid = 0; | |
| 203 } else { | |
| 204 valid = 1; | |
| 205 } | |
| 206 return valid; | |
| 207 } | |
| 208 | |
| 209 /* | |
| 210 * Get the device index of an opened joystick. | |
| 211 */ | |
| 212 int SDL_JoystickIndex(SDL_Joystick *joystick) | |
| 213 { | |
| 214 if ( ! ValidJoystick(&joystick) ) { | |
| 215 return(-1); | |
| 216 } | |
| 217 return(joystick->index); | |
| 218 } | |
| 219 | |
| 220 /* | |
| 221 * Get the number of multi-dimensional axis controls on a joystick | |
| 222 */ | |
| 223 int SDL_JoystickNumAxes(SDL_Joystick *joystick) | |
| 224 { | |
| 225 if ( ! ValidJoystick(&joystick) ) { | |
| 226 return(-1); | |
| 227 } | |
| 228 return(joystick->naxes); | |
| 229 } | |
| 230 | |
| 231 /* | |
| 232 * Get the number of hats on a joystick | |
| 233 */ | |
| 234 int SDL_JoystickNumHats(SDL_Joystick *joystick) | |
| 235 { | |
| 236 if ( ! ValidJoystick(&joystick) ) { | |
| 237 return(-1); | |
| 238 } | |
| 239 return(joystick->nhats); | |
| 240 } | |
| 241 | |
| 242 /* | |
| 243 * Get the number of trackballs on a joystick | |
| 244 */ | |
| 245 int SDL_JoystickNumBalls(SDL_Joystick *joystick) | |
| 246 { | |
| 247 if ( ! ValidJoystick(&joystick) ) { | |
| 248 return(-1); | |
| 249 } | |
| 250 return(joystick->nballs); | |
| 251 } | |
| 252 | |
| 253 /* | |
| 254 * Get the number of buttons on a joystick | |
| 255 */ | |
| 256 int SDL_JoystickNumButtons(SDL_Joystick *joystick) | |
| 257 { | |
| 258 if ( ! ValidJoystick(&joystick) ) { | |
| 259 return(-1); | |
| 260 } | |
| 261 return(joystick->nbuttons); | |
| 262 } | |
| 263 | |
| 264 /* | |
| 265 * Get the current state of an axis control on a joystick | |
| 266 */ | |
| 267 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis) | |
| 268 { | |
| 269 Sint16 state; | |
| 270 | |
| 271 if ( ! ValidJoystick(&joystick) ) { | |
| 272 return(0); | |
| 273 } | |
| 274 if ( axis < joystick->naxes ) { | |
| 275 state = joystick->axes[axis]; | |
| 276 } else { | |
| 277 SDL_SetError("Joystick only has %d axes", joystick->naxes); | |
| 278 state = 0; | |
| 279 } | |
| 280 return(state); | |
| 281 } | |
| 282 | |
| 283 /* | |
| 284 * Get the current state of a hat on a joystick | |
| 285 */ | |
| 286 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat) | |
| 287 { | |
| 288 Uint8 state; | |
| 289 | |
| 290 if ( ! ValidJoystick(&joystick) ) { | |
| 291 return(0); | |
| 292 } | |
| 293 if ( hat < joystick->nhats ) { | |
| 294 state = joystick->hats[hat]; | |
| 295 } else { | |
| 296 SDL_SetError("Joystick only has %d hats", joystick->nhats); | |
| 297 state = 0; | |
| 298 } | |
| 299 return(state); | |
| 300 } | |
| 301 | |
| 302 /* | |
| 303 * Get the ball axis change since the last poll | |
| 304 */ | |
| 305 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy) | |
| 306 { | |
| 307 int retval; | |
| 308 | |
| 309 if ( ! ValidJoystick(&joystick) ) { | |
| 310 return(-1); | |
| 311 } | |
| 312 | |
| 313 retval = 0; | |
| 314 if ( ball < joystick->nballs ) { | |
| 315 if ( dx ) { | |
| 316 *dx = joystick->balls[ball].dx; | |
| 317 } | |
| 318 if ( dy ) { | |
| 319 *dy = joystick->balls[ball].dy; | |
| 320 } | |
| 321 joystick->balls[ball].dx = 0; | |
| 322 joystick->balls[ball].dy = 0; | |
| 323 } else { | |
| 324 SDL_SetError("Joystick only has %d balls", joystick->nballs); | |
| 325 retval = -1; | |
| 326 } | |
| 327 return(retval); | |
| 328 } | |
| 329 | |
| 330 /* | |
| 331 * Get the current state of a button on a joystick | |
| 332 */ | |
| 333 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button) | |
| 334 { | |
| 335 Uint8 state; | |
| 336 | |
| 337 if ( ! ValidJoystick(&joystick) ) { | |
| 338 return(0); | |
| 339 } | |
| 340 if ( button < joystick->nbuttons ) { | |
| 341 state = joystick->buttons[button]; | |
| 342 } else { | |
| 343 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons); | |
| 344 state = 0; | |
| 345 } | |
| 346 return(state); | |
| 347 } | |
| 348 | |
| 349 /* | |
| 350 * Close a joystick previously opened with SDL_JoystickOpen() | |
| 351 */ | |
| 352 void SDL_JoystickClose(SDL_Joystick *joystick) | |
| 353 { | |
| 354 int i; | |
| 355 | |
| 356 if ( ! ValidJoystick(&joystick) ) { | |
| 357 return; | |
| 358 } | |
| 359 | |
| 360 /* First decrement ref count */ | |
| 361 if ( --joystick->ref_count > 0 ) { | |
| 362 return; | |
| 363 } | |
| 364 | |
| 365 /* Lock the event queue - prevent joystick polling */ | |
| 366 SDL_Lock_EventThread(); | |
| 367 | |
| 368 if ( joystick == default_joystick ) { | |
| 369 default_joystick = NULL; | |
| 370 } | |
| 371 SDL_SYS_JoystickClose(joystick); | |
| 372 | |
| 373 /* Remove joystick from list */ | |
| 374 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 375 if ( joystick == SDL_joysticks[i] ) { | |
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376 SDL_memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1], |
| 0 | 377 (SDL_numjoysticks-i)*sizeof(joystick)); |
| 378 break; | |
| 379 } | |
| 380 } | |
| 381 | |
| 382 /* Let the event thread keep running */ | |
| 383 SDL_Unlock_EventThread(); | |
| 384 | |
| 385 /* Free the data associated with this joystick */ | |
| 386 if ( joystick->axes ) { | |
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387 SDL_free(joystick->axes); |
| 0 | 388 } |
| 389 if ( joystick->hats ) { | |
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390 SDL_free(joystick->hats); |
| 0 | 391 } |
| 392 if ( joystick->balls ) { | |
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393 SDL_free(joystick->balls); |
| 0 | 394 } |
| 395 if ( joystick->buttons ) { | |
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396 SDL_free(joystick->buttons); |
| 0 | 397 } |
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398 SDL_free(joystick); |
| 0 | 399 } |
| 400 | |
| 401 void SDL_JoystickQuit(void) | |
| 402 { | |
| 403 /* Stop the event polling */ | |
| 404 SDL_Lock_EventThread(); | |
| 405 SDL_numjoysticks = 0; | |
| 406 SDL_Unlock_EventThread(); | |
| 407 | |
| 408 /* Quit the joystick setup */ | |
| 409 SDL_SYS_JoystickQuit(); | |
| 410 if ( SDL_joysticks ) { | |
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411 SDL_free(SDL_joysticks); |
| 0 | 412 SDL_joysticks = NULL; |
| 413 } | |
| 414 } | |
| 415 | |
| 416 | |
| 417 /* These are global for SDL_sysjoystick.c and SDL_events.c */ | |
| 418 | |
| 419 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value) | |
| 420 { | |
| 421 int posted; | |
| 422 | |
| 423 /* Update internal joystick state */ | |
| 424 joystick->axes[axis] = value; | |
| 425 | |
| 426 /* Post the event, if desired */ | |
| 427 posted = 0; | |
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428 #if !SDL_EVENTS_DISABLED |
| 0 | 429 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) { |
| 430 SDL_Event event; | |
| 431 event.type = SDL_JOYAXISMOTION; | |
| 432 event.jaxis.which = joystick->index; | |
| 433 event.jaxis.axis = axis; | |
| 434 event.jaxis.value = value; | |
| 435 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 436 posted = 1; | |
| 437 SDL_PushEvent(&event); | |
| 438 } | |
| 439 } | |
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440 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 441 return(posted); |
| 442 } | |
| 443 | |
| 444 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value) | |
| 445 { | |
| 446 int posted; | |
| 447 | |
| 448 /* Update internal joystick state */ | |
| 449 joystick->hats[hat] = value; | |
| 450 | |
| 451 /* Post the event, if desired */ | |
| 452 posted = 0; | |
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453 #if !SDL_EVENTS_DISABLED |
| 0 | 454 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) { |
| 455 SDL_Event event; | |
| 456 event.jhat.type = SDL_JOYHATMOTION; | |
| 457 event.jhat.which = joystick->index; | |
| 458 event.jhat.hat = hat; | |
| 459 event.jhat.value = value; | |
| 460 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 461 posted = 1; | |
| 462 SDL_PushEvent(&event); | |
| 463 } | |
| 464 } | |
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465 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 466 return(posted); |
| 467 } | |
| 468 | |
| 469 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball, | |
| 470 Sint16 xrel, Sint16 yrel) | |
| 471 { | |
| 472 int posted; | |
| 473 | |
| 474 /* Update internal mouse state */ | |
| 475 joystick->balls[ball].dx += xrel; | |
| 476 joystick->balls[ball].dy += yrel; | |
| 477 | |
| 478 /* Post the event, if desired */ | |
| 479 posted = 0; | |
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480 #if !SDL_EVENTS_DISABLED |
| 0 | 481 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) { |
| 482 SDL_Event event; | |
| 483 event.jball.type = SDL_JOYBALLMOTION; | |
| 484 event.jball.which = joystick->index; | |
| 485 event.jball.ball = ball; | |
| 486 event.jball.xrel = xrel; | |
| 487 event.jball.yrel = yrel; | |
| 488 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 489 posted = 1; | |
| 490 SDL_PushEvent(&event); | |
| 491 } | |
| 492 } | |
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493 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 494 return(posted); |
| 495 } | |
| 496 | |
| 497 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state) | |
| 498 { | |
| 499 int posted; | |
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500 #if !SDL_EVENTS_DISABLED |
| 0 | 501 SDL_Event event; |
| 502 | |
| 503 switch ( state ) { | |
| 504 case SDL_PRESSED: | |
| 505 event.type = SDL_JOYBUTTONDOWN; | |
| 506 break; | |
| 507 case SDL_RELEASED: | |
| 508 event.type = SDL_JOYBUTTONUP; | |
| 509 break; | |
| 510 default: | |
| 511 /* Invalid state -- bail */ | |
| 512 return(0); | |
| 513 } | |
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514 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 515 |
| 516 /* Update internal joystick state */ | |
| 517 joystick->buttons[button] = state; | |
| 518 | |
| 519 /* Post the event, if desired */ | |
| 520 posted = 0; | |
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521 #if !SDL_EVENTS_DISABLED |
| 0 | 522 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { |
| 523 event.jbutton.which = joystick->index; | |
| 524 event.jbutton.button = button; | |
| 525 event.jbutton.state = state; | |
| 526 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 527 posted = 1; | |
| 528 SDL_PushEvent(&event); | |
| 529 } | |
| 530 } | |
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531 #endif /* !SDL_EVENTS_DISABLED */ |
| 0 | 532 return(posted); |
| 533 } | |
| 534 | |
| 535 void SDL_JoystickUpdate(void) | |
| 536 { | |
| 537 int i; | |
| 538 | |
| 539 for ( i=0; SDL_joysticks[i]; ++i ) { | |
| 540 SDL_SYS_JoystickUpdate(SDL_joysticks[i]); | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 int SDL_JoystickEventState(int state) | |
| 545 { | |
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546 #if SDL_EVENTS_DISABLED |
| 0 | 547 return SDL_IGNORE; |
| 548 #else | |
| 549 const Uint8 event_list[] = { | |
| 550 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION, | |
| 551 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, | |
| 552 }; | |
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553 unsigned int i; |
| 0 | 554 |
| 555 switch (state) { | |
| 556 case SDL_QUERY: | |
| 557 state = SDL_IGNORE; | |
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558 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 559 state = SDL_EventState(event_list[i],SDL_QUERY); |
| 560 if ( state == SDL_ENABLE ) { | |
| 561 break; | |
| 562 } | |
| 563 } | |
| 564 break; | |
| 565 default: | |
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566 for ( i=0; i<SDL_arraysize(event_list); ++i ) { |
| 0 | 567 SDL_EventState(event_list[i], state); |
| 568 } | |
| 569 break; | |
| 570 } | |
| 571 return(state); | |
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572 #endif /* SDL_EVENTS_DISABLED */ |
| 0 | 573 } |