/
SDL_joystick.c
1699 lines (1443 loc) · 46.9 KB
1
2
/*
Simple DirectMedia Layer
3
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
/* This is the joystick API for Simple DirectMedia Layer */
#include "SDL.h"
26
#include "SDL_atomic.h"
27
28
29
30
31
32
33
34
#include "SDL_events.h"
#include "SDL_sysjoystick.h"
#include "SDL_assert.h"
#include "SDL_hints.h"
#if !SDL_EVENTS_DISABLED
#include "../events/SDL_events_c.h"
#endif
35
#include "../video/SDL_sysvideo.h"
36
37
38
/* This is included in only one place because it has a large static list of controllers */
#include "controller_type.h"
39
40
41
#ifdef __WIN32__
/* Needed for checking for input remapping programs */
42
#include "../core/windows/SDL_windows.h"
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
#undef UNICODE /* We want ASCII functions */
#include <tlhelp32.h>
#endif
static SDL_JoystickDriver *SDL_joystick_drivers[] = {
#if defined(SDL_JOYSTICK_DINPUT) || defined(SDL_JOYSTICK_XINPUT)
&SDL_WINDOWS_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_LINUX
&SDL_LINUX_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_IOKIT
&SDL_DARWIN_JoystickDriver,
#endif
#if defined(__IPHONEOS__) || defined(__TVOS__)
&SDL_IOS_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_ANDROID
&SDL_ANDROID_JoystickDriver,
#endif
64
65
66
#ifdef SDL_JOYSTICK_EMSCRIPTEN
&SDL_EMSCRIPTEN_JoystickDriver,
#endif
67
68
69
#ifdef SDL_JOYSTICK_HAIKU
&SDL_HAIKU_JoystickDriver,
#endif
70
71
72
#ifdef SDL_JOYSTICK_USBHID /* !!! FIXME: "USBHID" is a generic name, and doubly-confusing with HIDAPI next to it. This is the *BSD interface, rename this. */
&SDL_BSD_JoystickDriver,
#endif
73
74
75
76
77
78
79
#ifdef SDL_JOYSTICK_HIDAPI
&SDL_HIDAPI_JoystickDriver,
#endif
#if defined(SDL_JOYSTICK_DUMMY) || defined(SDL_JOYSTICK_DISABLED)
&SDL_DUMMY_JoystickDriver
#endif
};
80
81
static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
static SDL_Joystick *SDL_joysticks = NULL;
82
static SDL_bool SDL_updating_joystick = SDL_FALSE;
83
static SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */
84
static SDL_atomic_t SDL_next_joystick_instance_id;
85
86
void
87
SDL_LockJoysticks(void)
88
89
90
91
92
93
{
if (SDL_joystick_lock) {
SDL_LockMutex(SDL_joystick_lock);
}
}
94
void
95
SDL_UnlockJoysticks(void)
96
97
98
99
100
101
{
if (SDL_joystick_lock) {
SDL_UnlockMutex(SDL_joystick_lock);
}
}
102
103
static void SDLCALL
104
105
106
107
108
109
110
111
112
113
114
115
SDL_JoystickAllowBackgroundEventsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
if (hint && *hint == '1') {
SDL_joystick_allows_background_events = SDL_TRUE;
} else {
SDL_joystick_allows_background_events = SDL_FALSE;
}
}
int
SDL_JoystickInit(void)
{
116
int i, status;
117
118
119
SDL_GameControllerInitMappings();
120
121
122
123
124
/* Create the joystick list lock */
if (!SDL_joystick_lock) {
SDL_joystick_lock = SDL_CreateMutex();
}
125
126
127
128
129
130
131
132
133
134
/* See if we should allow joystick events while in the background */
SDL_AddHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
SDL_JoystickAllowBackgroundEventsChanged, NULL);
#if !SDL_EVENTS_DISABLED
if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0) {
return -1;
}
#endif /* !SDL_EVENTS_DISABLED */
135
136
137
138
139
status = -1;
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
if (SDL_joystick_drivers[i]->Init() >= 0) {
status = 0;
}
140
}
141
return status;
142
143
144
145
146
147
148
149
}
/*
* Count the number of joysticks attached to the system
*/
int
SDL_NumJoysticks(void)
{
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
int i, total_joysticks = 0;
SDL_LockJoysticks();
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
total_joysticks += SDL_joystick_drivers[i]->GetCount();
}
SDL_UnlockJoysticks();
return total_joysticks;
}
/*
* Return the next available joystick instance ID
* This may be called by drivers from multiple threads, unprotected by any locks
*/
SDL_JoystickID SDL_GetNextJoystickInstanceID()
{
return SDL_AtomicIncRef(&SDL_next_joystick_instance_id);
}
/*
* Get the driver and device index for an API device index
* This should be called while the joystick lock is held, to prevent another thread from updating the list
*/
SDL_bool
SDL_GetDriverAndJoystickIndex(int device_index, SDL_JoystickDriver **driver, int *driver_index)
{
int i, num_joysticks, total_joysticks = 0;
if (device_index >= 0) {
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
num_joysticks = SDL_joystick_drivers[i]->GetCount();
if (device_index < num_joysticks) {
*driver = SDL_joystick_drivers[i];
*driver_index = device_index;
return SDL_TRUE;
}
device_index -= num_joysticks;
total_joysticks += num_joysticks;
}
}
SDL_SetError("There are %d joysticks available", total_joysticks);
return SDL_FALSE;
192
193
}
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
/*
* Perform any needed fixups for joystick names
*/
static const char *
SDL_FixupJoystickName(const char *name)
{
if (name) {
const char *skip_prefix = "NVIDIA Corporation ";
if (SDL_strncmp(name, skip_prefix, SDL_strlen(skip_prefix)) == 0) {
name += SDL_strlen(skip_prefix);
}
}
return name;
}
211
212
213
214
215
216
/*
* Get the implementation dependent name of a joystick
*/
const char *
SDL_JoystickNameForIndex(int device_index)
{
217
218
219
220
221
222
SDL_JoystickDriver *driver;
const char *name = NULL;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
name = SDL_FixupJoystickName(driver->GetDeviceName(device_index));
223
}
224
225
226
227
SDL_UnlockJoysticks();
/* FIXME: Really we should reference count this name so it doesn't go away after unlock */
return name;
228
229
}
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
int
SDL_JoystickGetDevicePlayerIndex(int device_index)
{
SDL_JoystickDriver *driver;
int player_index = -1;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
player_index = driver->GetDevicePlayerIndex(device_index);
}
SDL_UnlockJoysticks();
return player_index;
}
245
246
247
248
249
250
251
252
/*
* Return true if this joystick is known to have all axes centered at zero
* This isn't generally needed unless the joystick never generates an initial axis value near zero,
* e.g. it's emulating axes with digital buttons
*/
static SDL_bool
SDL_JoystickAxesCenteredAtZero(SDL_Joystick *joystick)
{
253
254
255
static Uint32 zero_centered_joysticks[] = {
MAKE_VIDPID(0x0e8f, 0x3013), /* HuiJia SNES USB adapter */
MAKE_VIDPID(0x05a0, 0x3232), /* 8Bitdo Zero Gamepad */
256
257
258
};
int i;
259
260
Uint32 id = MAKE_VIDPID(SDL_JoystickGetVendor(joystick),
SDL_JoystickGetProduct(joystick));
261
262
263
/*printf("JOYSTICK '%s' VID/PID 0x%.4x/0x%.4x AXES: %d\n", joystick->name, vendor, product, joystick->naxes);*/
264
265
266
267
268
if (joystick->naxes == 2) {
/* Assume D-pad or thumbstick style axes are centered at 0 */
return SDL_TRUE;
}
269
for (i = 0; i < SDL_arraysize(zero_centered_joysticks); ++i) {
270
if (id == zero_centered_joysticks[i]) {
271
272
273
274
275
276
return SDL_TRUE;
}
}
return SDL_FALSE;
}
277
278
279
280
281
282
283
284
285
286
/*
* Open a joystick for use - the index passed as an argument refers to
* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
* This function returns a joystick identifier, or NULL if an error occurred.
*/
SDL_Joystick *
SDL_JoystickOpen(int device_index)
{
287
288
SDL_JoystickDriver *driver;
SDL_JoystickID instance_id;
289
290
291
292
SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
293
SDL_LockJoysticks();
294
295
296
297
298
299
if (!SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
SDL_UnlockJoysticks();
return NULL;
}
300
301
joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
302
303
* it is important that we have a single joystick * for each instance id
*/
304
instance_id = driver->GetDeviceInstanceID(device_index);
305
while (joysticklist) {
306
if (instance_id == joysticklist->instance_id) {
307
308
joystick = joysticklist;
++joystick->ref_count;
309
SDL_UnlockJoysticks();
310
return joystick;
311
312
313
314
315
}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
316
joystick = (SDL_Joystick *) SDL_calloc(sizeof(*joystick), 1);
317
318
if (joystick == NULL) {
SDL_OutOfMemory();
319
SDL_UnlockJoysticks();
320
321
return NULL;
}
322
323
joystick->driver = driver;
joystick->instance_id = instance_id;
324
joystick->attached = SDL_TRUE;
325
joystick->player_index = -1;
326
327
if (driver->Open(joystick, device_index) < 0) {
328
SDL_free(joystick);
329
SDL_UnlockJoysticks();
330
331
332
return NULL;
}
333
334
joystickname = driver->GetDeviceName(device_index);
if (joystickname) {
335
joystick->name = SDL_strdup(joystickname);
336
} else {
337
joystick->name = NULL;
338
339
340
}
joystick->guid = driver->GetDeviceGUID(device_index);
341
342
if (joystick->naxes > 0) {
343
joystick->axes = (SDL_JoystickAxisInfo *) SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
344
345
}
if (joystick->nhats > 0) {
346
joystick->hats = (Uint8 *) SDL_calloc(joystick->nhats, sizeof(Uint8));
347
348
}
if (joystick->nballs > 0) {
349
joystick->balls = (struct balldelta *) SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
350
351
}
if (joystick->nbuttons > 0) {
352
joystick->buttons = (Uint8 *) SDL_calloc(joystick->nbuttons, sizeof(Uint8));
353
354
355
356
357
358
359
}
if (((joystick->naxes > 0) && !joystick->axes)
|| ((joystick->nhats > 0) && !joystick->hats)
|| ((joystick->nballs > 0) && !joystick->balls)
|| ((joystick->nbuttons > 0) && !joystick->buttons)) {
SDL_OutOfMemory();
SDL_JoystickClose(joystick);
360
SDL_UnlockJoysticks();
361
362
return NULL;
}
363
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
364
365
366
367
368
369
370
371
372
373
/* If this joystick is known to have all zero centered axes, skip the auto-centering code */
if (SDL_JoystickAxesCenteredAtZero(joystick)) {
int i;
for (i = 0; i < joystick->naxes; ++i) {
joystick->axes[i].has_initial_value = SDL_TRUE;
}
}
374
375
joystick->is_game_controller = SDL_IsGameController(device_index);
376
377
378
379
380
381
/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
382
SDL_UnlockJoysticks();
383
384
driver->Update(joystick);
385
386
return joystick;
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
}
/*
* Checks to make sure the joystick is valid.
*/
int
SDL_PrivateJoystickValid(SDL_Joystick * joystick)
{
int valid;
if (joystick == NULL) {
SDL_SetError("Joystick hasn't been opened yet");
valid = 0;
} else {
valid = 1;
}
return valid;
}
/*
* Get the number of multi-dimensional axis controls on a joystick
*/
int
SDL_JoystickNumAxes(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
415
return -1;
416
}
417
return joystick->naxes;
418
419
420
421
422
423
424
425
426
}
/*
* Get the number of hats on a joystick
*/
int
SDL_JoystickNumHats(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
427
return -1;
428
}
429
return joystick->nhats;
430
431
432
433
434
435
436
437
438
}
/*
* Get the number of trackballs on a joystick
*/
int
SDL_JoystickNumBalls(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
439
return -1;
440
}
441
return joystick->nballs;
442
443
444
445
446
447
448
449
450
}
/*
* Get the number of buttons on a joystick
*/
int
SDL_JoystickNumButtons(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
451
return -1;
452
}
453
return joystick->nbuttons;
454
455
456
457
458
459
460
461
462
463
464
}
/*
* Get the current state of an axis control on a joystick
*/
Sint16
SDL_JoystickGetAxis(SDL_Joystick * joystick, int axis)
{
Sint16 state;
if (!SDL_PrivateJoystickValid(joystick)) {
465
return 0;
466
467
}
if (axis < joystick->naxes) {
468
state = joystick->axes[axis].value;
469
470
471
472
} else {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
state = 0;
}
473
return state;
474
475
}
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
* Get the initial state of an axis control on a joystick
*/
SDL_bool
SDL_JoystickGetAxisInitialState(SDL_Joystick * joystick, int axis, Sint16 *state)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return SDL_FALSE;
}
if (axis >= joystick->naxes) {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
return SDL_FALSE;
}
if (state) {
*state = joystick->axes[axis].initial_value;
}
return joystick->axes[axis].has_initial_value;
}
495
496
497
498
499
500
501
502
503
/*
* Get the current state of a hat on a joystick
*/
Uint8
SDL_JoystickGetHat(SDL_Joystick * joystick, int hat)
{
Uint8 state;
if (!SDL_PrivateJoystickValid(joystick)) {
504
return 0;
505
506
507
508
509
510
511
}
if (hat < joystick->nhats) {
state = joystick->hats[hat];
} else {
SDL_SetError("Joystick only has %d hats", joystick->nhats);
state = 0;
}
512
return state;
513
514
515
516
517
518
519
520
521
522
523
}
/*
* Get the ball axis change since the last poll
*/
int
SDL_JoystickGetBall(SDL_Joystick * joystick, int ball, int *dx, int *dy)
{
int retval;
if (!SDL_PrivateJoystickValid(joystick)) {
524
return -1;
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
}
retval = 0;
if (ball < joystick->nballs) {
if (dx) {
*dx = joystick->balls[ball].dx;
}
if (dy) {
*dy = joystick->balls[ball].dy;
}
joystick->balls[ball].dx = 0;
joystick->balls[ball].dy = 0;
} else {
return SDL_SetError("Joystick only has %d balls", joystick->nballs);
}
540
return retval;
541
542
543
544
545
546
547
548
549
550
551
}
/*
* Get the current state of a button on a joystick
*/
Uint8
SDL_JoystickGetButton(SDL_Joystick * joystick, int button)
{
Uint8 state;
if (!SDL_PrivateJoystickValid(joystick)) {
552
return 0;
553
554
555
556
557
558
559
}
if (button < joystick->nbuttons) {
state = joystick->buttons[button];
} else {
SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);
state = 0;
}
560
return state;
561
562
563
564
565
566
567
568
569
570
571
572
573
}
/*
* Return if the joystick in question is currently attached to the system,
* \return SDL_FALSE if not plugged in, SDL_TRUE if still present.
*/
SDL_bool
SDL_JoystickGetAttached(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return SDL_FALSE;
}
574
return joystick->attached;
575
576
577
578
579
580
581
582
583
}
/*
* Get the instance id for this opened joystick
*/
SDL_JoystickID
SDL_JoystickInstanceID(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
584
return -1;
585
586
}
587
return joystick->instance_id;
588
589
}
590
591
592
593
594
595
/*
* Find the SDL_Joystick that owns this instance id
*/
SDL_Joystick *
SDL_JoystickFromInstanceID(SDL_JoystickID joyid)
{
596
597
SDL_Joystick *joystick;
598
SDL_LockJoysticks();
599
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
600
if (joystick->instance_id == joyid) {
601
break;
602
603
}
}
604
SDL_UnlockJoysticks();
605
return joystick;
606
607
}
608
609
610
611
612
613
614
/*
* Get the friendly name of this joystick
*/
const char *
SDL_JoystickName(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
615
return NULL;
616
617
}
618
return SDL_FixupJoystickName(joystick->name);
619
620
}
621
622
623
624
625
626
627
628
629
int
SDL_JoystickGetPlayerIndex(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return -1;
}
return joystick->player_index;
}
630
631
632
633
634
635
636
637
638
int
SDL_JoystickRumble(SDL_Joystick * joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return -1;
}
return joystick->driver->Rumble(joystick, low_frequency_rumble, high_frequency_rumble, duration_ms);
}
639
640
641
642
643
644
645
646
647
/*
* Close a joystick previously opened with SDL_JoystickOpen()
*/
void
SDL_JoystickClose(SDL_Joystick * joystick)
{
SDL_Joystick *joysticklist;
SDL_Joystick *joysticklistprev;
648
if (!SDL_PrivateJoystickValid(joystick)) {
649
650
651
return;
}
652
SDL_LockJoysticks();
653
654
655
/* First decrement ref count */
if (--joystick->ref_count > 0) {
656
SDL_UnlockJoysticks();
657
658
659
return;
}
660
if (SDL_updating_joystick) {
661
SDL_UnlockJoysticks();
662
663
664
return;
}
665
joystick->driver->Close(joystick);
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
joystick->hwdata = NULL;
joysticklist = SDL_joysticks;
joysticklistprev = NULL;
while (joysticklist) {
if (joystick == joysticklist) {
if (joysticklistprev) {
/* unlink this entry */
joysticklistprev->next = joysticklist->next;
} else {
SDL_joysticks = joystick->next;
}
break;
}
joysticklistprev = joysticklist;
joysticklist = joysticklist->next;
}
SDL_free(joystick->name);
/* Free the data associated with this joystick */
SDL_free(joystick->axes);
SDL_free(joystick->hats);
SDL_free(joystick->balls);
SDL_free(joystick->buttons);
SDL_free(joystick);
692
693
SDL_UnlockJoysticks();
694
695
696
697
698
}
void
SDL_JoystickQuit(void)
{
699
700
int i;
701
702
703
/* Make sure we're not getting called in the middle of updating joysticks */
SDL_assert(!SDL_updating_joystick);
704
SDL_LockJoysticks();
705
706
707
708
709
710
711
712
/* Stop the event polling */
while (SDL_joysticks) {
SDL_joysticks->ref_count = 1;
SDL_JoystickClose(SDL_joysticks);
}
/* Quit the joystick setup */
713
714
715
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
SDL_joystick_drivers[i]->Quit();
}
716
717
SDL_UnlockJoysticks();
718
719
720
721
#if !SDL_EVENTS_DISABLED
SDL_QuitSubSystem(SDL_INIT_EVENTS);
#endif
722
723
724
725
SDL_DelHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
SDL_JoystickAllowBackgroundEventsChanged, NULL);
726
727
728
729
if (SDL_joystick_lock) {
SDL_DestroyMutex(SDL_joystick_lock);
SDL_joystick_lock = NULL;
}
730
731
SDL_GameControllerQuitMappings();
732
733
734
735
736
737
738
739
740
741
}
static SDL_bool
SDL_PrivateJoystickShouldIgnoreEvent()
{
if (SDL_joystick_allows_background_events) {
return SDL_FALSE;
}
742
743
744
if (SDL_HasWindows() && SDL_GetKeyboardFocus() == NULL) {
/* We have windows but we don't have focus, ignore the event. */
return SDL_TRUE;
745
746
747
748
749
750
}
return SDL_FALSE;
}
/* These are global for SDL_sysjoystick.c and SDL_events.c */
751
void SDL_PrivateJoystickAdded(SDL_JoystickID device_instance)
752
753
754
{
#if !SDL_EVENTS_DISABLED
SDL_Event event;
755
756
757
758
759
760
int device_index;
device_index = SDL_JoystickGetDeviceIndexFromInstanceID(device_instance);
if (device_index < 0) {
return;
}
761
762
763
764
765
event.type = SDL_JOYDEVICEADDED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = device_index;
766
SDL_PushEvent(&event);
767
768
769
770
771
772
773
774
775
776
777
778
779
}
#endif /* !SDL_EVENTS_DISABLED */
}
/*
* If there is an existing add event in the queue, it needs to be modified
* to have the right value for which, because the number of controllers in
* the system is now one less.
*/
static void UpdateEventsForDeviceRemoval()
{
int i, num_events;
SDL_Event *events;
780
SDL_bool isstack;
781
782
783
784
785
786
num_events = SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_JOYDEVICEADDED, SDL_JOYDEVICEADDED);
if (num_events <= 0) {
return;
}
787
events = SDL_small_alloc(SDL_Event, num_events, &isstack);
788
789
790
791
792
793
794
795
796
797
if (!events) {
return;
}
num_events = SDL_PeepEvents(events, num_events, SDL_GETEVENT, SDL_JOYDEVICEADDED, SDL_JOYDEVICEADDED);
for (i = 0; i < num_events; ++i) {
--events[i].jdevice.which;
}
SDL_PeepEvents(events, num_events, SDL_ADDEVENT, 0, 0);
798
SDL_small_free(events, isstack);
799
800
801
802
}
void SDL_PrivateJoystickRemoved(SDL_JoystickID device_instance)
{
803
804
SDL_Joystick *joystick;
805
806
807
808
809
810
811
#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEREMOVED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = device_instance;
812
SDL_PushEvent(&event);
813
814
815
816
}
UpdateEventsForDeviceRemoval();
#endif /* !SDL_EVENTS_DISABLED */
817
818
819
820
821
822
823
824
825
/* Mark this joystick as no longer attached */
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
if (joystick->instance_id == device_instance) {
joystick->attached = SDL_FALSE;
joystick->force_recentering = SDL_TRUE;
break;
}
}
826
827
}
828
829
830
831
832
833
834
835
836
int
SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
{
int posted;
/* Make sure we're not getting garbage or duplicate events */
if (axis >= joystick->naxes) {
return 0;
}
837
if (!joystick->axes[axis].has_initial_value) {
838
joystick->axes[axis].initial_value = value;
839
840
841
842
joystick->axes[axis].value = value;
joystick->axes[axis].zero = value;
joystick->axes[axis].has_initial_value = SDL_TRUE;
}
843
844
845
if (value == joystick->axes[axis].value) {
return 0;
}
846
if (!joystick->axes[axis].sent_initial_value) {
847
848
849
850
851
/* Make sure we don't send motion until there's real activity on this axis */
const int MAX_ALLOWED_JITTER = SDL_JOYSTICK_AXIS_MAX / 80; /* ShanWan PS3 controller needed 96 */
if (SDL_abs(value - joystick->axes[axis].value) <= MAX_ALLOWED_JITTER) {
return 0;
}
852
853
joystick->axes[axis].sent_initial_value = SDL_TRUE;
joystick->axes[axis].value = value; /* Just so we pass the check above */
854
SDL_PrivateJoystickAxis(joystick, axis, joystick->axes[axis].initial_value);
855
}
856
857
858
859
860
/* We ignore events if we don't have keyboard focus, except for centering
* events.
*/
if (SDL_PrivateJoystickShouldIgnoreEvent()) {
861
862
if ((value > joystick->axes[axis].zero && value >= joystick->axes[axis].value) ||
(value < joystick->axes[axis].zero && value <= joystick->axes[axis].value)) {
863
864
865
866
867
return 0;
}
}
/* Update internal joystick state */
868
joystick->axes[axis].value = value;
869
870
871
872
873
874
875
876
877
878
879
880
881
/* Post the event, if desired */
posted = 0;
#if !SDL_EVENTS_DISABLED
if (SDL_GetEventState(SDL_JOYAXISMOTION) == SDL_ENABLE) {
SDL_Event event;
event.type = SDL_JOYAXISMOTION;
event.jaxis.which = joystick->instance_id;
event.jaxis.axis = axis;
event.jaxis.value = value;
posted = SDL_PushEvent(&event) == 1;
}
#endif /* !SDL_EVENTS_DISABLED */
882
return posted;
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
}
int
SDL_PrivateJoystickHat(SDL_Joystick * joystick, Uint8 hat, Uint8 value)
{
int posted;
/* Make sure we're not getting garbage or duplicate events */
if (hat >= joystick->nhats) {
return 0;
}
if (value == joystick->hats[hat]) {
return 0;
}
/* We ignore events if we don't have keyboard focus, except for centering
* events.
*/
if (SDL_PrivateJoystickShouldIgnoreEvent()) {
if (value != SDL_HAT_CENTERED) {
return 0;
}
}
/* Update internal joystick state */
joystick->hats[hat] = value;
/* Post the event, if desired */
posted = 0;
#if !SDL_EVENTS_DISABLED
if (SDL_GetEventState(SDL_JOYHATMOTION) == SDL_ENABLE) {
SDL_Event event;
event.jhat.type = SDL_JOYHATMOTION;
event.jhat.which = joystick->instance_id;
event.jhat.hat = hat;
event.jhat.value = value;
posted = SDL_PushEvent(&event) == 1;
}
#endif /* !SDL_EVENTS_DISABLED */
922
return posted;
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
}
int
SDL_PrivateJoystickBall(SDL_Joystick * joystick, Uint8 ball,
Sint16 xrel, Sint16 yrel)
{
int posted;
/* Make sure we're not getting garbage events */
if (ball >= joystick->nballs) {
return 0;
}
/* We ignore events if we don't have keyboard focus. */
if (SDL_PrivateJoystickShouldIgnoreEvent()) {
return 0;
}
/* Update internal mouse state */
joystick->balls[ball].dx += xrel;
joystick->balls[ball].dy += yrel;
/* Post the event, if desired */
posted = 0;
#if !SDL_EVENTS_DISABLED
if (SDL_GetEventState(SDL_JOYBALLMOTION) == SDL_ENABLE) {
SDL_Event event;
event.jball.type = SDL_JOYBALLMOTION;
event.jball.which = joystick->instance_id;
event.jball.ball = ball;
event.jball.xrel = xrel;
event.jball.yrel = yrel;
posted = SDL_PushEvent(&event) == 1;
}
#endif /* !SDL_EVENTS_DISABLED */
958
return posted;
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
}
int
SDL_PrivateJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
{
int posted;
#if !SDL_EVENTS_DISABLED
SDL_Event event;
switch (state) {
case SDL_PRESSED:
event.type = SDL_JOYBUTTONDOWN;
break;
case SDL_RELEASED:
event.type = SDL_JOYBUTTONUP;
break;
default:
/* Invalid state -- bail */
977
return 0;
978
979
980
981
982
983
}
#endif /* !SDL_EVENTS_DISABLED */
/* Make sure we're not getting garbage or duplicate events */
if (button >= joystick->nbuttons) {
return 0;
984
985
986
987
}
if (state == joystick->buttons[button]) {
return 0;
}
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* We ignore events if we don't have keyboard focus, except for button
* release. */
if (SDL_PrivateJoystickShouldIgnoreEvent()) {
if (state == SDL_PRESSED) {
return 0;
}
}
/* Update internal joystick state */
joystick->buttons[button] = state;
/* Post the event, if desired */