1 /* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20 */ 21 22 /** 23 * \file SDL_joystick.h 24 * 25 * Include file for SDL joystick event handling 26 * 27 * The term "device_index" identifies currently plugged in joystick devices between 0 and SDL_NumJoysticks(), with the exact joystick 28 * behind a device_index changing as joysticks are plugged and unplugged. 29 * 30 * The term "instance_id" is the current instantiation of a joystick device in the system, if the joystick is removed and then re-inserted 31 * then it will get a new instance_id, instance_id's are monotonically increasing identifiers of a joystick plugged in. 32 * 33 * The term "player_index" is the number assigned to a player on a specific 34 * controller. For XInput controllers this returns the XInput user index. 35 * Many joysticks will not be able to supply this information. 36 * 37 * The term JoystickGUID is a stable 128-bit identifier for a joystick device that does not change over time, it identifies class of 38 * the device (a X360 wired controller for example). This identifier is platform dependent. 39 */ 40 41 #ifndef SDL_joystick_h_ 42 #define SDL_joystick_h_ 43 44 #include "SDL_stdinc.h" 45 #include "SDL_error.h" 46 47 #include "begin_code.h" 48 /* Set up for C function definitions, even when using C++ */ 49 #ifdef __cplusplus 50 extern "C" { 51 #endif 52 53 /** 54 * \file SDL_joystick.h 55 * 56 * In order to use these functions, SDL_Init() must have been called 57 * with the ::SDL_INIT_JOYSTICK flag. This causes SDL to scan the system 58 * for joysticks, and load appropriate drivers. 59 * 60 * If you would like to receive joystick updates while the application 61 * is in the background, you should set the following hint before calling 62 * SDL_Init(): SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS 63 */ 64 65 /** 66 * The joystick structure used to identify an SDL joystick 67 */ 68 struct _SDL_Joystick; 69 typedef struct _SDL_Joystick SDL_Joystick; 70 71 /* A structure that encodes the stable unique id for a joystick device */ 72 typedef struct { 73 Uint8 data[16]; 74 } SDL_JoystickGUID; 75 76 /** 77 * This is a unique ID for a joystick for the time it is connected to the system, 78 * and is never reused for the lifetime of the application. If the joystick is 79 * disconnected and reconnected, it will get a new ID. 80 * 81 * The ID value starts at 0 and increments from there. The value -1 is an invalid ID. 82 */ 83 typedef Sint32 SDL_JoystickID; 84 85 typedef enum 86 { 87 SDL_JOYSTICK_TYPE_UNKNOWN, 88 SDL_JOYSTICK_TYPE_GAMECONTROLLER, 89 SDL_JOYSTICK_TYPE_WHEEL, 90 SDL_JOYSTICK_TYPE_ARCADE_STICK, 91 SDL_JOYSTICK_TYPE_FLIGHT_STICK, 92 SDL_JOYSTICK_TYPE_DANCE_PAD, 93 SDL_JOYSTICK_TYPE_GUITAR, 94 SDL_JOYSTICK_TYPE_DRUM_KIT, 95 SDL_JOYSTICK_TYPE_ARCADE_PAD, 96 SDL_JOYSTICK_TYPE_THROTTLE 97 } SDL_JoystickType; 98 99 typedef enum 100 { 101 SDL_JOYSTICK_POWER_UNKNOWN = -1, 102 SDL_JOYSTICK_POWER_EMPTY, /* <= 5% */ 103 SDL_JOYSTICK_POWER_LOW, /* <= 20% */ 104 SDL_JOYSTICK_POWER_MEDIUM, /* <= 70% */ 105 SDL_JOYSTICK_POWER_FULL, /* <= 100% */ 106 SDL_JOYSTICK_POWER_WIRED, 107 SDL_JOYSTICK_POWER_MAX 108 } SDL_JoystickPowerLevel; 109 110 /* Set max recognized G-force from accelerometer 111 See src/joystick/uikit/SDL_sysjoystick.m for notes on why this is needed 112 */ 113 #define SDL_IPHONE_MAX_GFORCE 5.0 114 115 116 /* Function prototypes */ 117 118 /** 119 * Locking for multi-threaded access to the joystick API 120 * 121 * If you are using the joystick API or handling events from multiple threads 122 * you should use these locking functions to protect access to the joysticks. 123 * 124 * In particular, you are guaranteed that the joystick list won't change, so 125 * the API functions that take a joystick index will be valid, and joystick 126 * and game controller events will not be delivered. 127 * 128 * \since This function is available since SDL 2.0.7. 129 */ 130 extern DECLSPEC void SDLCALL SDL_LockJoysticks(void); 131 132 133 /** 134 * Unlocking for multi-threaded access to the joystick API 135 * 136 * If you are using the joystick API or handling events from multiple threads 137 * you should use these locking functions to protect access to the joysticks. 138 * 139 * In particular, you are guaranteed that the joystick list won't change, so 140 * the API functions that take a joystick index will be valid, and joystick 141 * and game controller events will not be delivered. 142 * 143 * \since This function is available since SDL 2.0.7. 144 */ 145 extern DECLSPEC void SDLCALL SDL_UnlockJoysticks(void); 146 147 /** 148 * Count the number of joysticks attached to the system. 149 * 150 * \returns the number of attached joysticks on success or a negative error 151 * code on failure; call SDL_GetError() for more information. 152 * 153 * \since This function is available since SDL 2.0.0. 154 * 155 * \sa SDL_JoystickName 156 * \sa SDL_JoystickOpen 157 */ 158 extern DECLSPEC int SDLCALL SDL_NumJoysticks(void); 159 160 /** 161 * Get the implementation dependent name of a joystick. 162 * 163 * This can be called before any joysticks are opened. 164 * 165 * \param device_index the index of the joystick to query (the N'th joystick 166 * on the system) 167 * \returns the name of the selected joystick. If no name can be found, this 168 * function returns NULL; call SDL_GetError() for more information. 169 * 170 * \since This function is available since SDL 2.0.0. 171 * 172 * \sa SDL_JoystickName 173 * \sa SDL_JoystickOpen 174 */ 175 extern DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex(int device_index); 176 177 /** 178 * Get the player index of a joystick, or -1 if it's not available This can be 179 * called before any joysticks are opened. 180 * 181 * \since This function is available since SDL 2.0.9. 182 */ 183 extern DECLSPEC int SDLCALL SDL_JoystickGetDevicePlayerIndex(int device_index); 184 185 /** 186 * Get the implementation-dependent GUID for the joystick at a given device 187 * index. 188 * 189 * This function can be called before any joysticks are opened. 190 * 191 * \param device_index the index of the joystick to query (the N'th joystick 192 * on the system 193 * \returns the GUID of the selected joystick. If called on an invalid index, 194 * this function returns a zero GUID 195 * 196 * \since This function is available since SDL 2.0.0. 197 * 198 * \sa SDL_JoystickGetGUID 199 * \sa SDL_JoystickGetGUIDString 200 */ 201 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID(int device_index); 202 203 /** 204 * Get the USB vendor ID of a joystick, if available. 205 * 206 * This can be called before any joysticks are opened. If the vendor ID isn't 207 * available this function returns 0. 208 * 209 * \param device_index the index of the joystick to query (the N'th joystick 210 * on the system 211 * \returns the USB vendor ID of the selected joystick. If called on an 212 * invalid index, this function returns zero 213 * 214 * \since This function is available since SDL 2.0.6. 215 */ 216 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceVendor(int device_index); 217 218 /** 219 * Get the USB product ID of a joystick, if available. 220 * 221 * This can be called before any joysticks are opened. If the product ID isn't 222 * available this function returns 0. 223 * 224 * \param device_index the index of the joystick to query (the N'th joystick 225 * on the system 226 * \returns the USB product ID of the selected joystick. If called on an 227 * invalid index, this function returns zero 228 * 229 * \since This function is available since SDL 2.0.6. 230 */ 231 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProduct(int device_index); 232 233 /** 234 * Get the product version of a joystick, if available. 235 * 236 * This can be called before any joysticks are opened. If the product version 237 * isn't available this function returns 0. 238 * 239 * \param device_index the index of the joystick to query (the N'th joystick 240 * on the system 241 * \returns the product version of the selected joystick. If called on an 242 * invalid index, this function returns zero 243 * 244 * \since This function is available since SDL 2.0.6. 245 */ 246 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetDeviceProductVersion(int device_index); 247 248 /** 249 * Get the type of a joystick, if available. 250 * 251 * This can be called before any joysticks are opened. 252 * 253 * \param device_index the index of the joystick to query (the N'th joystick 254 * on the system 255 * \returns the SDL_JoystickType of the selected joystick. If called on an 256 * invalid index, this function returns `SDL_JOYSTICK_TYPE_UNKNOWN` 257 * 258 * \since This function is available since SDL 2.0.6. 259 */ 260 extern DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetDeviceType(int device_index); 261 262 /** 263 * Get the instance ID of a joystick. 264 * 265 * This can be called before any joysticks are opened. If the index is out of 266 * range, this function will return -1. 267 * 268 * \param device_index the index of the joystick to query (the N'th joystick 269 * on the system 270 * \returns the instance id of the selected joystick. If called on an invalid 271 * index, this function returns zero 272 * 273 * \since This function is available since SDL 2.0.6. 274 */ 275 extern DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickGetDeviceInstanceID(int device_index); 276 277 /** 278 * Open a joystick for use. 279 * 280 * The `device_index` argument refers to the N'th joystick presently 281 * recognized by SDL on the system. It is **NOT** the same as the instance ID 282 * used to identify the joystick in future events. See 283 * SDL_JoystickInstanceID() for more details about instance IDs. 284 * 285 * The joystick subsystem must be initialized before a joystick can be opened 286 * for use. 287 * 288 * \param device_index the index of the joystick to query 289 * \returns a joystick identifier or NULL if an error occurred; call 290 * SDL_GetError() for more information. 291 * 292 * \since This function is available since SDL 2.0.0. 293 * 294 * \sa SDL_JoystickClose 295 * \sa SDL_JoystickInstanceID 296 */ 297 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index); 298 299 /** 300 * Get the SDL_Joystick associated with an instance id. 301 * 302 * \param instance_id the instance id to get the SDL_Joystick for 303 * \returns an SDL_Joystick on success or NULL on failure; call SDL_GetError() 304 * for more information. 305 * 306 * \since This function is available since SDL 2.0.4. 307 */ 308 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromInstanceID(SDL_JoystickID instance_id); 309 310 /** 311 * Get the SDL_Joystick associated with a player index. 312 * 313 * \param player_index the player index to get the SDL_Joystick for 314 * \returns an SDL_Joystick on success or NULL on failure; call SDL_GetError() 315 * for more information. 316 * 317 * \since This function is available since SDL 2.0.12. 318 */ 319 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromPlayerIndex(int player_index); 320 321 /** 322 * Attach a new virtual joystick. 323 * 324 * \returns the joystick's device index, or -1 if an error occurred. 325 * 326 * \since This function is available since SDL 2.0.14. 327 */ 328 extern DECLSPEC int SDLCALL SDL_JoystickAttachVirtual(SDL_JoystickType type, 329 int naxes, 330 int nbuttons, 331 int nhats); 332 333 /** 334 * Detach a virtual joystick. 335 * 336 * \param device_index a value previously returned from 337 * SDL_JoystickAttachVirtual() 338 * \returns 0 on success, or -1 if an error occurred. 339 * 340 * \since This function is available since SDL 2.0.14. 341 */ 342 extern DECLSPEC int SDLCALL SDL_JoystickDetachVirtual(int device_index); 343 344 /** 345 * Query whether or not the joystick at a given device index is virtual. 346 * 347 * \param device_index a joystick device index. 348 * \returns SDL_TRUE if the joystick is virtual, SDL_FALSE otherwise. 349 * 350 * \since This function is available since SDL 2.0.14. 351 */ 352 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickIsVirtual(int device_index); 353 354 /** 355 * Set values on an opened, virtual-joystick's axis. 356 * 357 * Please note that values set here will not be applied until the next call to 358 * SDL_JoystickUpdate, which can either be called directly, or can be called 359 * indirectly through various other SDL APIs, including, but not limited to 360 * the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, 361 * SDL_WaitEvent. 362 * 363 * \param joystick the virtual joystick on which to set state. 364 * \param axis the specific axis on the virtual joystick to set. 365 * \param value the new value for the specified axis. 366 * \returns 0 on success, -1 on error. 367 * 368 * \since This function is available since SDL 2.0.14. 369 */ 370 extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualAxis(SDL_Joystick *joystick, int axis, Sint16 value); 371 372 /** 373 * Set values on an opened, virtual-joystick's button. 374 * 375 * Please note that values set here will not be applied until the next call to 376 * SDL_JoystickUpdate, which can either be called directly, or can be called 377 * indirectly through various other SDL APIs, including, but not limited to 378 * the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, 379 * SDL_WaitEvent. 380 * 381 * \param joystick the virtual joystick on which to set state. 382 * \param button the specific button on the virtual joystick to set. 383 * \param value the new value for the specified button. 384 * \returns 0 on success, -1 on error. 385 * 386 * \since This function is available since SDL 2.0.14. 387 */ 388 extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualButton(SDL_Joystick *joystick, int button, Uint8 value); 389 390 /** 391 * Set values on an opened, virtual-joystick's hat. 392 * 393 * Please note that values set here will not be applied until the next call to 394 * SDL_JoystickUpdate, which can either be called directly, or can be called 395 * indirectly through various other SDL APIs, including, but not limited to 396 * the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, 397 * SDL_WaitEvent. 398 * 399 * \param joystick the virtual joystick on which to set state. 400 * \param hat the specific hat on the virtual joystick to set. 401 * \param value the new value for the specified hat. 402 * \returns 0 on success, -1 on error. 403 * 404 * \since This function is available since SDL 2.0.14. 405 */ 406 extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualHat(SDL_Joystick *joystick, int hat, Uint8 value); 407 408 /** 409 * Get the implementation dependent name of a joystick. 410 * 411 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 412 * \returns the name of the selected joystick. If no name can be found, this 413 * function returns NULL; call SDL_GetError() for more information. 414 * 415 * \since This function is available since SDL 2.0.0. 416 * 417 * \sa SDL_JoystickNameForIndex 418 * \sa SDL_JoystickOpen 419 */ 420 extern DECLSPEC const char *SDLCALL SDL_JoystickName(SDL_Joystick *joystick); 421 422 /** 423 * Get the player index of an opened joystick. 424 * 425 * For XInput controllers this returns the XInput user index. Many joysticks 426 * will not be able to supply this information. 427 * 428 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 429 * \returns the player index, or -1 if it's not available. 430 * 431 * \since This function is available since SDL 2.0.9. 432 */ 433 extern DECLSPEC int SDLCALL SDL_JoystickGetPlayerIndex(SDL_Joystick *joystick); 434 435 /** 436 * Set the player index of an opened joystick. 437 * 438 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 439 * \param player_index the player index to set. 440 * 441 * \since This function is available since SDL 2.0.12. 442 */ 443 extern DECLSPEC void SDLCALL SDL_JoystickSetPlayerIndex(SDL_Joystick *joystick, int player_index); 444 445 /** 446 * Get the implementation-dependent GUID for the joystick. 447 * 448 * This function requires an open joystick. 449 * 450 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 451 * \returns the GUID of the given joystick. If called on an invalid index, 452 * this function returns a zero GUID; call SDL_GetError() for more 453 * information. 454 * 455 * \since This function is available since SDL 2.0.0. 456 * 457 * \sa SDL_JoystickGetDeviceGUID 458 * \sa SDL_JoystickGetGUIDString 459 */ 460 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID(SDL_Joystick *joystick); 461 462 /** 463 * Get the USB vendor ID of an opened joystick, if available. 464 * 465 * If the vendor ID isn't available this function returns 0. 466 * 467 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 468 * \returns the USB vendor ID of the selected joystick, or 0 if unavailable. 469 * 470 * \since This function is available since SDL 2.0.6. 471 */ 472 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetVendor(SDL_Joystick *joystick); 473 474 /** 475 * Get the USB product ID of an opened joystick, if available. 476 * 477 * If the product ID isn't available this function returns 0. 478 * 479 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 480 * \returns the USB product ID of the selected joystick, or 0 if unavailable. 481 * 482 * \since This function is available since SDL 2.0.6. 483 */ 484 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetProduct(SDL_Joystick *joystick); 485 486 /** 487 * Get the product version of an opened joystick, if available. 488 * 489 * If the product version isn't available this function returns 0. 490 * 491 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 492 * \returns the product version of the selected joystick, or 0 if unavailable. 493 * 494 * \since This function is available since SDL 2.0.6. 495 */ 496 extern DECLSPEC Uint16 SDLCALL SDL_JoystickGetProductVersion(SDL_Joystick *joystick); 497 498 /** 499 * Get the serial number of an opened joystick, if available. 500 * 501 * Returns the serial number of the joystick, or NULL if it is not available. 502 * 503 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 504 * \returns the serial number of the selected joystick, or NULL if 505 * unavailable. 506 * 507 * \since This function is available since SDL 2.0.14. 508 */ 509 extern DECLSPEC const char * SDLCALL SDL_JoystickGetSerial(SDL_Joystick *joystick); 510 511 /** 512 * Get the type of an opened joystick. 513 * 514 * \param joystick the SDL_Joystick obtained from SDL_JoystickOpen() 515 * \returns the SDL_JoystickType of the selected joystick. 516 * 517 * \since This function is available since SDL 2.0.6. 518 */ 519 extern DECLSPEC SDL_JoystickType SDLCALL SDL_JoystickGetType(SDL_Joystick *joystick); 520 521 /** 522 * Get an ASCII string representation for a given SDL_JoystickGUID. 523 * 524 * You should supply at least 33 bytes for pszGUID. 525 * 526 * \param guid the SDL_JoystickGUID you wish to convert to string 527 * \param pszGUID buffer in which to write the ASCII string 528 * \param cbGUID the size of pszGUID 529 * 530 * \since This function is available since SDL 2.0.0. 531 * 532 * \sa SDL_JoystickGetDeviceGUID 533 * \sa SDL_JoystickGetGUID 534 * \sa SDL_JoystickGetGUIDFromString 535 */ 536 extern DECLSPEC void SDLCALL SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID); 537 538 /** 539 * Convert a GUID string into a SDL_JoystickGUID structure. 540 * 541 * Performs no error checking. If this function is given a string containing 542 * an invalid GUID, the function will silently succeed, but the GUID generated 543 * will not be useful. 544 * 545 * \param pchGUID string containing an ASCII representation of a GUID 546 * \returns a SDL_JoystickGUID structure. 547 * 548 * \since This function is available since SDL 2.0.0. 549 * 550 * \sa SDL_JoystickGetGUIDString 551 */ 552 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString(const char *pchGUID); 553 554 /** 555 * Get the status of a specified joystick. 556 * 557 * \param joystick the joystick to query 558 * \returns SDL_TRUE if the joystick has been opened, SDL_FALSE if it has not; 559 * call SDL_GetError() for more information. 560 * 561 * \since This function is available since SDL 2.0.0. 562 * 563 * \sa SDL_JoystickClose 564 * \sa SDL_JoystickOpen 565 */ 566 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached(SDL_Joystick *joystick); 567 568 /** 569 * Get the instance ID of an opened joystick. 570 * 571 * \param joystick an SDL_Joystick structure containing joystick information 572 * \returns the instance ID of the specified joystick on success or a negative 573 * error code on failure; call SDL_GetError() for more information. 574 * 575 * \since This function is available since SDL 2.0.0. 576 * 577 * \sa SDL_JoystickOpen 578 */ 579 extern DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID(SDL_Joystick *joystick); 580 581 /** 582 * Get the number of general axis controls on a joystick. 583 * 584 * Often, the directional pad on a game controller will either look like 4 585 * separate buttons or a POV hat, and not axes, but all of this is up to the 586 * device and platform. 587 * 588 * \param joystick an SDL_Joystick structure containing joystick information 589 * \returns the number of axis controls/number of axes on success or a 590 * negative error code on failure; call SDL_GetError() for more 591 * information. 592 * 593 * \since This function is available since SDL 2.0.0. 594 * 595 * \sa SDL_JoystickGetAxis 596 * \sa SDL_JoystickOpen 597 */ 598 extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick *joystick); 599 600 /** 601 * Get the number of trackballs on a joystick. 602 * 603 * Joystick trackballs have only relative motion events associated with them 604 * and their state cannot be polled. 605 * 606 * Most joysticks do not have trackballs. 607 * 608 * \param joystick an SDL_Joystick structure containing joystick information 609 * \returns the number of trackballs on success or a negative error code on 610 * failure; call SDL_GetError() for more information. 611 * 612 * \since This function is available since SDL 2.0.0. 613 * 614 * \sa SDL_JoystickGetBall 615 */ 616 extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick *joystick); 617 618 /** 619 * Get the number of POV hats on a joystick. 620 * 621 * \param joystick an SDL_Joystick structure containing joystick information 622 * \returns the number of POV hats on success or a negative error code on 623 * failure; call SDL_GetError() for more information. 624 * 625 * \since This function is available since SDL 2.0.0. 626 * 627 * \sa SDL_JoystickGetHat 628 * \sa SDL_JoystickOpen 629 */ 630 extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick *joystick); 631 632 /** 633 * Get the number of buttons on a joystick. 634 * 635 * \param joystick an SDL_Joystick structure containing joystick information 636 * \returns the number of buttons on success or a negative error code on 637 * failure; call SDL_GetError() for more information. 638 * 639 * \since This function is available since SDL 2.0.0. 640 * 641 * \sa SDL_JoystickGetButton 642 * \sa SDL_JoystickOpen 643 */ 644 extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick *joystick); 645 646 /** 647 * Update the current state of the open joysticks. 648 * 649 * This is called automatically by the event loop if any joystick events are 650 * enabled. 651 * 652 * \since This function is available since SDL 2.0.0. 653 * 654 * \sa SDL_JoystickEventState 655 */ 656 extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void); 657 658 /** 659 * Enable/disable joystick event polling. 660 * 661 * If joystick events are disabled, you must call SDL_JoystickUpdate() 662 * yourself and manually check the state of the joystick when you want 663 * joystick information. 664 * 665 * It is recommended that you leave joystick event handling enabled. 666 * 667 * **WARNING**: Calling this function may delete all events currently in SDL's 668 * event queue. 669 * 670 * \param state can be one of `SDL_QUERY`, `SDL_IGNORE`, or `SDL_ENABLE` 671 * \returns 1 if enabled, 0 if disabled, or a negative error code on failure; 672 * call SDL_GetError() for more information. 673 * 674 * If `state` is `SDL_QUERY` then the current state is returned, 675 * otherwise the new processing state is returned. 676 * 677 * \since This function is available since SDL 2.0.0. 678 * 679 * \sa SDL_GameControllerEventState 680 */ 681 extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state); 682 683 #define SDL_JOYSTICK_AXIS_MAX 32767 684 #define SDL_JOYSTICK_AXIS_MIN -32768 685 686 /** 687 * Get the current state of an axis control on a joystick. 688 * 689 * SDL makes no promises about what part of the joystick any given axis refers 690 * to. Your game should have some sort of configuration UI to let users 691 * specify what each axis should be bound to. Alternately, SDL's higher-level 692 * Game Controller API makes a great effort to apply order to this lower-level 693 * interface, so you know that a specific axis is the "left thumb stick," etc. 694 * 695 * The value returned by SDL_JoystickGetAxis() is a signed integer (-32768 to 696 * 32767) representing the current position of the axis. It may be necessary 697 * to impose certain tolerances on these values to account for jitter. 698 * 699 * \param joystick an SDL_Joystick structure containing joystick information 700 * \param axis the axis to query; the axis indices start at index 0 701 * \returns a 16-bit signed integer representing the current position of the 702 * axis or 0 on failure; call SDL_GetError() for more information. 703 * 704 * \since This function is available since SDL 2.0.0. 705 * 706 * \sa SDL_JoystickNumAxes 707 */ 708 extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick *joystick, 709 int axis); 710 711 /** 712 * Get the initial state of an axis control on a joystick. 713 * 714 * The state is a value ranging from -32768 to 32767. 715 * 716 * The axis indices start at index 0. 717 * 718 * \param joystick an SDL_Joystick structure containing joystick information 719 * \param axis the axis to query; the axis indices start at index 0 720 * \param state Upon return, the initial value is supplied here. 721 * \return SDL_TRUE if this axis has any initial value, or SDL_FALSE if not. 722 * 723 * \since This function is available since SDL 2.0.6. 724 */ 725 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAxisInitialState(SDL_Joystick *joystick, 726 int axis, Sint16 *state); 727 728 /** 729 * \name Hat positions 730 */ 731 /* @{ */ 732 #define SDL_HAT_CENTERED 0x00 733 #define SDL_HAT_UP 0x01 734 #define SDL_HAT_RIGHT 0x02 735 #define SDL_HAT_DOWN 0x04 736 #define SDL_HAT_LEFT 0x08 737 #define SDL_HAT_RIGHTUP (SDL_HAT_RIGHT|SDL_HAT_UP) 738 #define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHT|SDL_HAT_DOWN) 739 #define SDL_HAT_LEFTUP (SDL_HAT_LEFT|SDL_HAT_UP) 740 #define SDL_HAT_LEFTDOWN (SDL_HAT_LEFT|SDL_HAT_DOWN) 741 /* @} */ 742 743 /** 744 * Get the current state of a POV hat on a joystick. 745 * 746 * The returned value will be one of the following positions: 747 * 748 * - `SDL_HAT_CENTERED` 749 * - `SDL_HAT_UP` 750 * - `SDL_HAT_RIGHT` 751 * - `SDL_HAT_DOWN` 752 * - `SDL_HAT_LEFT` 753 * - `SDL_HAT_RIGHTUP` 754 * - `SDL_HAT_RIGHTDOWN` 755 * - `SDL_HAT_LEFTUP` 756 * - `SDL_HAT_LEFTDOWN` 757 * 758 * \param joystick an SDL_Joystick structure containing joystick information 759 * \param hat the hat index to get the state from; indices start at index 0 760 * \returns the current hat position. 761 * 762 * \since This function is available since SDL 2.0.0. 763 * 764 * \sa SDL_JoystickNumHats 765 */ 766 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick *joystick, 767 int hat); 768 769 /** 770 * Get the ball axis change since the last poll. 771 * 772 * Trackballs can only return relative motion since the last call to 773 * SDL_JoystickGetBall(), these motion deltas are placed into `dx` and `dy`. 774 * 775 * Most joysticks do not have trackballs. 776 * 777 * \param joystick the SDL_Joystick to query 778 * \param ball the ball index to query; ball indices start at index 0 779 * \param dx stores the difference in the x axis position since the last poll 780 * \param dy stores the difference in the y axis position since the last poll 781 * \returns 0 on success or a negative error code on failure; call 782 * SDL_GetError() for more information. 783 * 784 * \since This function is available since SDL 2.0.0. 785 * 786 * \sa SDL_JoystickNumBalls 787 */ 788 extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick *joystick, 789 int ball, int *dx, int *dy); 790 791 /** 792 * Get the current state of a button on a joystick. 793 * 794 * \param joystick an SDL_Joystick structure containing joystick information 795 * \param button the button index to get the state from; indices start at 796 * index 0 797 * \returns 1 if the specified button is pressed, 0 otherwise. 798 * 799 * \since This function is available since SDL 2.0.0. 800 * 801 * \sa SDL_JoystickNumButtons 802 */ 803 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick *joystick, 804 int button); 805 806 /** 807 * Start a rumble effect. 808 * 809 * Each call to this function cancels any previous rumble effect, and calling 810 * it with 0 intensity stops any rumbling. 811 * 812 * \param joystick The joystick to vibrate 813 * \param low_frequency_rumble The intensity of the low frequency (left) 814 * rumble motor, from 0 to 0xFFFF 815 * \param high_frequency_rumble The intensity of the high frequency (right) 816 * rumble motor, from 0 to 0xFFFF 817 * \param duration_ms The duration of the rumble effect, in milliseconds 818 * \returns 0, or -1 if rumble isn't supported on this joystick 819 * 820 * \since This function is available since SDL 2.0.9. 821 * 822 * \sa SDL_JoystickHasRumble 823 */ 824 extern DECLSPEC int SDLCALL SDL_JoystickRumble(SDL_Joystick *joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms); 825 826 /** 827 * Start a rumble effect in the joystick's triggers 828 * 829 * Each call to this function cancels any previous trigger rumble effect, and 830 * calling it with 0 intensity stops any rumbling. 831 * 832 * Note that this function is for _trigger_ rumble; the first joystick to 833 * support this was the PlayStation 5's DualShock 5 controller. If you want 834 * the (more common) whole-controller rumble, use SDL_JoystickRumble() 835 * instead. 836 * 837 * \param joystick The joystick to vibrate 838 * \param left_rumble The intensity of the left trigger rumble motor, from 0 839 * to 0xFFFF 840 * \param right_rumble The intensity of the right trigger rumble motor, from 0 841 * to 0xFFFF 842 * \param duration_ms The duration of the rumble effect, in milliseconds 843 * \returns 0, or -1 if trigger rumble isn't supported on this joystick 844 * 845 * \since This function is available since SDL 2.0.14. 846 * 847 * \sa SDL_JoystickHasRumbleTriggers 848 */ 849 extern DECLSPEC int SDLCALL SDL_JoystickRumbleTriggers(SDL_Joystick *joystick, Uint16 left_rumble, Uint16 right_rumble, Uint32 duration_ms); 850 851 /** 852 * Query whether a joystick has an LED. 853 * 854 * An example of a joystick LED is the light on the back of a PlayStation 4's 855 * DualShock 4 controller. 856 * 857 * \param joystick The joystick to query 858 * \return SDL_TRUE if the joystick has a modifiable LED, SDL_FALSE otherwise. 859 * 860 * \since This function is available since SDL 2.0.14. 861 */ 862 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasLED(SDL_Joystick *joystick); 863 864 /** 865 * Query whether a joystick has rumble support. 866 * 867 * \param joystick The joystick to query 868 * \return SDL_TRUE if the joystick has rumble, SDL_FALSE otherwise. 869 * 870 * \since This function is available since SDL 2.0.18. 871 * 872 * \sa SDL_JoystickRumble 873 */ 874 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumble(SDL_Joystick *joystick); 875 876 /** 877 * Query whether a joystick has rumble support on triggers. 878 * 879 * \param joystick The joystick to query 880 * \return SDL_TRUE if the joystick has trigger rumble, SDL_FALSE otherwise. 881 * 882 * \since This function is available since SDL 2.0.18. 883 * 884 * \sa SDL_JoystickRumbleTriggers 885 */ 886 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickHasRumbleTriggers(SDL_Joystick *joystick); 887 888 /** 889 * Update a joystick's LED color. 890 * 891 * An example of a joystick LED is the light on the back of a PlayStation 4's 892 * DualShock 4 controller. 893 * 894 * \param joystick The joystick to update 895 * \param red The intensity of the red LED 896 * \param green The intensity of the green LED 897 * \param blue The intensity of the blue LED 898 * \returns 0 on success, -1 if this joystick does not have a modifiable LED 899 * 900 * \since This function is available since SDL 2.0.14. 901 */ 902 extern DECLSPEC int SDLCALL SDL_JoystickSetLED(SDL_Joystick *joystick, Uint8 red, Uint8 green, Uint8 blue); 903 904 /** 905 * Send a joystick specific effect packet 906 * 907 * \param joystick The joystick to affect 908 * \param data The data to send to the joystick 909 * \param size The size of the data to send to the joystick 910 * \returns 0, or -1 if this joystick or driver doesn't support effect packets 911 * 912 * \since This function is available since SDL 2.0.16. 913 */ 914 extern DECLSPEC int SDLCALL SDL_JoystickSendEffect(SDL_Joystick *joystick, const void *data, int size); 915 916 /** 917 * Close a joystick previously opened with SDL_JoystickOpen(). 918 * 919 * \param joystick The joystick device to close 920 * 921 * \since This function is available since SDL 2.0.0. 922 * 923 * \sa SDL_JoystickOpen 924 */ 925 extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick *joystick); 926 927 /** 928 * Get the battery level of a joystick as SDL_JoystickPowerLevel. 929 * 930 * \param joystick the SDL_Joystick to query 931 * \returns the current battery level as SDL_JoystickPowerLevel on success or 932 * `SDL_JOYSTICK_POWER_UNKNOWN` if it is unknown 933 * 934 * \since This function is available since SDL 2.0.4. 935 */ 936 extern DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_JoystickCurrentPowerLevel(SDL_Joystick *joystick); 937 938 /* Ends C function definitions when using C++ */ 939 #ifdef __cplusplus 940 } 941 #endif 942 #include "close_code.h" 943 944 #endif /* SDL_joystick_h_ */ 945 946 /* vi: set ts=4 sw=4 expandtab: */ 947