summaryrefslogtreecommitdiffstats
path: root/dom/gamepad/cocoa/CocoaGamepad.cpp
blob: 24786f5ef6818ad1b3d9ca23ac38792c33b5930a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
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
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// mostly derived from the Allegro source code at:
// http://alleg.svn.sourceforge.net/viewvc/alleg/allegro/branches/4.9/src/macosx/hidjoy.m?revision=13760&view=markup

#include "mozilla/dom/Gamepad.h"
#include "mozilla/dom/GamepadPlatformService.h"
#include "mozilla/ArrayUtils.h"
#include "nsThreadUtils.h"
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/hid/IOHIDBase.h>
#include <IOKit/hid/IOHIDKeys.h>
#include <IOKit/hid/IOHIDManager.h>

#include <stdio.h>
#include <vector>

namespace {

using namespace mozilla;
using namespace mozilla::dom;
using std::vector;

struct Button {
  int id;
  bool analog;
  IOHIDElementRef element;
  CFIndex min;
  CFIndex max;

  Button(int aId, IOHIDElementRef aElement, CFIndex aMin, CFIndex aMax) :
    id(aId),
    analog((aMax - aMin) > 1),
    element(aElement),
    min(aMin),
    max(aMax) {}
};

struct Axis {
  int id;
  IOHIDElementRef element;
  uint32_t usagePage;
  uint32_t usage;
  CFIndex min;
  CFIndex max;
};

typedef bool dpad_buttons[4];

// These values can be found in the USB HID Usage Tables:
// http://www.usb.org/developers/hidpage
const unsigned kDesktopUsagePage = 0x01;
const unsigned kSimUsagePage = 0x02;
const unsigned kAcceleratorUsage = 0xC4;
const unsigned kBrakeUsage = 0xC5;
const unsigned kJoystickUsage = 0x04;
const unsigned kGamepadUsage = 0x05;
const unsigned kAxisUsageMin = 0x30;
const unsigned kAxisUsageMax = 0x35;
const unsigned kDpadUsage = 0x39;
const unsigned kButtonUsagePage = 0x09;
const unsigned kConsumerPage = 0x0C;
const unsigned kHomeUsage = 0x223;
const unsigned kBackUsage = 0x224;


class Gamepad {
 private:
  IOHIDDeviceRef mDevice;
  nsTArray<Button> buttons;
  nsTArray<Axis> axes;
  IOHIDElementRef mDpad;
  dpad_buttons mDpadState;

 public:
  Gamepad() : mDevice(nullptr), mDpad(nullptr), mSuperIndex(-1) {}
  bool operator==(IOHIDDeviceRef device) const { return mDevice == device; }
  bool empty() const { return mDevice == nullptr; }
  void clear()
  {
    mDevice = nullptr;
    buttons.Clear();
    axes.Clear();
    mDpad = nullptr;
    mSuperIndex = -1;
  }
  void init(IOHIDDeviceRef device);
  size_t numButtons() { return buttons.Length() + (mDpad ? 4 : 0); }
  size_t numAxes() { return axes.Length(); }

  // Index given by our superclass.
  uint32_t mSuperIndex;

  bool isDpad(IOHIDElementRef element) const
  {
    return element == mDpad;
  }

  const dpad_buttons& getDpadState() const
  {
    return mDpadState;
  }

  void setDpadState(const dpad_buttons& dpadState)
  {
    for (unsigned i = 0; i < ArrayLength(mDpadState); i++) {
      mDpadState[i] = dpadState[i];
    }
  }

  const Button* lookupButton(IOHIDElementRef element) const
  {
    for (unsigned i = 0; i < buttons.Length(); i++) {
      if (buttons[i].element == element)
        return &buttons[i];
    }
    return nullptr;
  }

  const Axis* lookupAxis(IOHIDElementRef element) const
  {
    for (unsigned i = 0; i < axes.Length(); i++) {
      if (axes[i].element == element)
        return &axes[i];
    }
    return nullptr;
  }
};

class AxisComparator {
public:
  bool Equals(const Axis& a1, const Axis& a2) const
  {
    return a1.usagePage == a2.usagePage && a1.usage == a2.usage;
  }
  bool LessThan(const Axis& a1, const Axis& a2) const
  {
    if (a1.usagePage == a2.usagePage) {
      return a1.usage < a2.usage;
    }
    return a1.usagePage < a2.usagePage;
  }
};

void Gamepad::init(IOHIDDeviceRef device)
{
  clear();
  mDevice = device;

  CFArrayRef elements = IOHIDDeviceCopyMatchingElements(device,
                                                        nullptr,
                                                        kIOHIDOptionsTypeNone);
  CFIndex n = CFArrayGetCount(elements);
  for (CFIndex i = 0; i < n; i++) {
    IOHIDElementRef element = (IOHIDElementRef)CFArrayGetValueAtIndex(elements,
                                                                      i);
    uint32_t usagePage = IOHIDElementGetUsagePage(element);
    uint32_t usage = IOHIDElementGetUsage(element);

    if (usagePage == kDesktopUsagePage &&
        usage >= kAxisUsageMin &&
        usage <= kAxisUsageMax)
    {
      Axis axis = { int(axes.Length()),
                    element,
                    usagePage,
                    usage,
                    IOHIDElementGetLogicalMin(element),
                    IOHIDElementGetLogicalMax(element) };
      axes.AppendElement(axis);
    } else if (usagePage == kDesktopUsagePage && usage == kDpadUsage &&
               // Don't know how to handle d-pads that return weird values.
               IOHIDElementGetLogicalMax(element) - IOHIDElementGetLogicalMin(element) == 7) {
      mDpad = element;
    } else if ((usagePage == kSimUsagePage &&
                 (usage == kAcceleratorUsage ||
                  usage == kBrakeUsage)) ||
               (usagePage == kButtonUsagePage) ||
               (usagePage == kConsumerPage &&
                 (usage == kHomeUsage ||
                  usage == kBackUsage))) {
      Button button(int(buttons.Length()), element, IOHIDElementGetLogicalMin(element), IOHIDElementGetLogicalMax(element));
      buttons.AppendElement(button);
    } else {
      //TODO: handle other usage pages
    }
  }

  AxisComparator comparator;
  axes.Sort(comparator);
  for (unsigned i = 0; i < axes.Length(); i++) {
    axes[i].id = i;
  }
}

class DarwinGamepadService {
 private:
  IOHIDManagerRef mManager;
  vector<Gamepad> mGamepads;

  //Workaround to support running in background thread
  CFRunLoopRef mMonitorRunLoop;
  nsCOMPtr<nsIThread> mMonitorThread;

  static void DeviceAddedCallback(void* data, IOReturn result,
                                  void* sender, IOHIDDeviceRef device);
  static void DeviceRemovedCallback(void* data, IOReturn result,
                                    void* sender, IOHIDDeviceRef device);
  static void InputValueChangedCallback(void* data, IOReturn result,
                                        void* sender, IOHIDValueRef newValue);

  void DeviceAdded(IOHIDDeviceRef device);
  void DeviceRemoved(IOHIDDeviceRef device);
  void InputValueChanged(IOHIDValueRef value);
  void StartupInternal();

 public:
  DarwinGamepadService();
  ~DarwinGamepadService();
  void Startup();
  void Shutdown();
  friend class DarwinGamepadServiceStartupRunnable;
};

class DarwinGamepadServiceStartupRunnable final : public Runnable
{
 private:
  ~DarwinGamepadServiceStartupRunnable() {}
  // This Runnable schedules startup of DarwinGamepadService
  // in a new thread, pointer to DarwinGamepadService is only
  // used by this Runnable within its thread.
  DarwinGamepadService MOZ_NON_OWNING_REF *mService;
 public:
  explicit DarwinGamepadServiceStartupRunnable(DarwinGamepadService *service)
             : mService(service) {}
  NS_IMETHOD Run() override
  {
    MOZ_ASSERT(mService);
    mService->StartupInternal();
    return NS_OK;
  }
};

void
DarwinGamepadService::DeviceAdded(IOHIDDeviceRef device)
{
  RefPtr<GamepadPlatformService> service =
    GamepadPlatformService::GetParentService();
  if (!service) {
    return;
  }

  size_t slot = size_t(-1);
  for (size_t i = 0; i < mGamepads.size(); i++) {
    if (mGamepads[i] == device)
      return;
    if (slot == size_t(-1) && mGamepads[i].empty())
      slot = i;
  }

  if (slot == size_t(-1)) {
    slot = mGamepads.size();
    mGamepads.push_back(Gamepad());
  }
  mGamepads[slot].init(device);

  // Gather some identifying information
  CFNumberRef vendorIdRef =
    (CFNumberRef)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey));
  CFNumberRef productIdRef =
    (CFNumberRef)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductIDKey));
  CFStringRef productRef =
    (CFStringRef)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductKey));
  int vendorId, productId;
  CFNumberGetValue(vendorIdRef, kCFNumberIntType, &vendorId);
  CFNumberGetValue(productIdRef, kCFNumberIntType, &productId);
  char product_name[128];
  CFStringGetCString(productRef, product_name,
                     sizeof(product_name), kCFStringEncodingASCII);
  char buffer[256];
  sprintf(buffer, "%x-%x-%s", vendorId, productId, product_name);
  uint32_t index = service->AddGamepad(buffer,
                                       mozilla::dom::GamepadMappingType::_empty,
                                       (int)mGamepads[slot].numButtons(),
                                       (int)mGamepads[slot].numAxes());
  mGamepads[slot].mSuperIndex = index;
}

void
DarwinGamepadService::DeviceRemoved(IOHIDDeviceRef device)
{
  RefPtr<GamepadPlatformService> service =
    GamepadPlatformService::GetParentService();
  if (!service) {
    return;
  }
  for (size_t i = 0; i < mGamepads.size(); i++) {
    if (mGamepads[i] == device) {
      service->RemoveGamepad(mGamepads[i].mSuperIndex);
      mGamepads[i].clear();
      return;
    }
  }
}

/*
 * Given a value from a d-pad (POV hat in USB HID terminology),
 * represent it as 4 buttons, one for each cardinal direction.
 */
static void
UnpackDpad(int dpad_value, int min, int max, dpad_buttons& buttons)
{
  const unsigned kUp = 0;
  const unsigned kDown = 1;
  const unsigned kLeft = 2;
  const unsigned kRight = 3;

  // Different controllers have different ways of representing
  // "nothing is pressed", but they're all outside the range of values.
  if (dpad_value < min || dpad_value > max) {
    // Nothing is pressed.
    return;
  }

  // Normalize value to start at 0.
  int value = dpad_value - min;

  // Value will be in the range 0-7. The value represents the
  // position of the d-pad around a circle, with 0 being straight up,
  // 2 being right, 4 being straight down, and 6 being left.
  if (value < 2 || value > 6) {
    buttons[kUp] = true;
  }
  if (value > 2 && value < 6) {
    buttons[kDown] = true;
  }
  if (value > 4) {
    buttons[kLeft] = true;
  }
  if (value > 0 && value < 4) {
    buttons[kRight] = true;
  }
}

void
DarwinGamepadService::InputValueChanged(IOHIDValueRef value)
{
  RefPtr<GamepadPlatformService> service =
    GamepadPlatformService::GetParentService();
  if (!service) {
    return;
  }

  uint32_t value_length = IOHIDValueGetLength(value);
  if (value_length > 4) {
    // Workaround for bizarre issue with PS3 controllers that try to return
    // massive (30+ byte) values and crash IOHIDValueGetIntegerValue
    return;
  }
  IOHIDElementRef element = IOHIDValueGetElement(value);
  IOHIDDeviceRef device = IOHIDElementGetDevice(element);

  for (unsigned i = 0; i < mGamepads.size(); i++) {
    Gamepad &gamepad = mGamepads[i];
    if (gamepad == device) {
      if (gamepad.isDpad(element)) {
        const dpad_buttons& oldState = gamepad.getDpadState();
        dpad_buttons newState = { false, false, false, false };
        UnpackDpad(IOHIDValueGetIntegerValue(value),
                   IOHIDElementGetLogicalMin(element),
                   IOHIDElementGetLogicalMax(element),
                   newState);
        const int numButtons = gamepad.numButtons();
        for (unsigned b = 0; b < ArrayLength(newState); b++) {
          if (newState[b] != oldState[b]) {
            service->NewButtonEvent(gamepad.mSuperIndex,
                                    numButtons - 4 + b,
                                    newState[b]);
          }
        }
        gamepad.setDpadState(newState);
      } else if (const Axis* axis = gamepad.lookupAxis(element)) {
        double d = IOHIDValueGetIntegerValue(value);
        double v = 2.0f * (d - axis->min) /
          (double)(axis->max - axis->min) - 1.0f;
        service->NewAxisMoveEvent(gamepad.mSuperIndex, axis->id, v);
      } else if (const Button* button = gamepad.lookupButton(element)) {
        int iv = IOHIDValueGetIntegerValue(value);
        bool pressed = iv != 0;
        double v = 0;
        if (button->analog) {
          double dv = iv;
          v = (dv - button->min) / (double)(button->max - button->min);
        } else {
          v = pressed ? 1.0 : 0.0;
        }
        service->NewButtonEvent(gamepad.mSuperIndex, button->id, pressed, v);
      }
      return;
    }
  }
}

void
DarwinGamepadService::DeviceAddedCallback(void* data, IOReturn result,
                                         void* sender, IOHIDDeviceRef device)
{
  DarwinGamepadService* service = (DarwinGamepadService*)data;
  service->DeviceAdded(device);
}

void
DarwinGamepadService::DeviceRemovedCallback(void* data, IOReturn result,
                                           void* sender, IOHIDDeviceRef device)
{
  DarwinGamepadService* service = (DarwinGamepadService*)data;
  service->DeviceRemoved(device);
}

void
DarwinGamepadService::InputValueChangedCallback(void* data,
                                               IOReturn result,
                                               void* sender,
                                               IOHIDValueRef newValue)
{
  DarwinGamepadService* service = (DarwinGamepadService*)data;
  service->InputValueChanged(newValue);
}

static CFMutableDictionaryRef
MatchingDictionary(UInt32 inUsagePage, UInt32 inUsage)
{
  CFMutableDictionaryRef dict =
    CFDictionaryCreateMutable(kCFAllocatorDefault,
                              0,
                              &kCFTypeDictionaryKeyCallBacks,
                              &kCFTypeDictionaryValueCallBacks);
  if (!dict)
    return nullptr;
  CFNumberRef number = CFNumberCreate(kCFAllocatorDefault,
                                      kCFNumberIntType,
                                      &inUsagePage);
  if (!number) {
    CFRelease(dict);
    return nullptr;
  }
  CFDictionarySetValue(dict, CFSTR(kIOHIDDeviceUsagePageKey), number);
  CFRelease(number);

  number = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &inUsage);
  if (!number) {
    CFRelease(dict);
    return nullptr;
  }
  CFDictionarySetValue(dict, CFSTR(kIOHIDDeviceUsageKey), number);
  CFRelease(number);

  return dict;
}

DarwinGamepadService::DarwinGamepadService() : mManager(nullptr) {}

DarwinGamepadService::~DarwinGamepadService()
{
  if (mManager != nullptr)
    CFRelease(mManager);
}

void
DarwinGamepadService::StartupInternal()
{
  if (mManager != nullptr)
    return;

  IOHIDManagerRef manager = IOHIDManagerCreate(kCFAllocatorDefault,
                                               kIOHIDOptionsTypeNone);

  CFMutableDictionaryRef criteria_arr[2];
  criteria_arr[0] = MatchingDictionary(kDesktopUsagePage,
                                       kJoystickUsage);
  if (!criteria_arr[0]) {
    CFRelease(manager);
    return;
  }

  criteria_arr[1] = MatchingDictionary(kDesktopUsagePage,
                                       kGamepadUsage);
  if (!criteria_arr[1]) {
    CFRelease(criteria_arr[0]);
    CFRelease(manager);
    return;
  }

  CFArrayRef criteria =
    CFArrayCreate(kCFAllocatorDefault, (const void**)criteria_arr, 2, nullptr);
  if (!criteria) {
    CFRelease(criteria_arr[1]);
    CFRelease(criteria_arr[0]);
    CFRelease(manager);
    return;
  }

  IOHIDManagerSetDeviceMatchingMultiple(manager, criteria);
  CFRelease(criteria);
  CFRelease(criteria_arr[1]);
  CFRelease(criteria_arr[0]);

  IOHIDManagerRegisterDeviceMatchingCallback(manager,
                                             DeviceAddedCallback,
                                             this);
  IOHIDManagerRegisterDeviceRemovalCallback(manager,
                                            DeviceRemovedCallback,
                                            this);
  IOHIDManagerRegisterInputValueCallback(manager,
                                         InputValueChangedCallback,
                                         this);
  IOHIDManagerScheduleWithRunLoop(manager,
                                  CFRunLoopGetCurrent(),
                                  kCFRunLoopDefaultMode);
  IOReturn rv = IOHIDManagerOpen(manager, kIOHIDOptionsTypeNone);
  if (rv != kIOReturnSuccess) {
    CFRelease(manager);
    return;
  }

  mManager = manager;

  // We held the handle of the CFRunLoop to make sure we
  // can shut it down explicitly by CFRunLoopStop in another
  // thread.
  mMonitorRunLoop = CFRunLoopGetCurrent();

  // CFRunLoopRun() is a blocking message loop when it's called in
  // non-main thread so this thread cannot receive any other runnables
  // and nsITimer timeout events after it's called.
  CFRunLoopRun();
}

void DarwinGamepadService::Startup()
{
  Unused << NS_NewThread(getter_AddRefs(mMonitorThread),
                         new DarwinGamepadServiceStartupRunnable(this));
}

void DarwinGamepadService::Shutdown()
{
  IOHIDManagerRef manager = (IOHIDManagerRef)mManager;
  CFRunLoopStop(mMonitorRunLoop);
  if (manager) {
    IOHIDManagerClose(manager, 0);
    CFRelease(manager);
    mManager = nullptr;
  }
  mMonitorThread->Shutdown();
}

} // namespace

namespace mozilla {
namespace dom {

DarwinGamepadService* gService = nullptr;

void StartGamepadMonitoring()
{
  if (gService) {
    return;
  }

  gService = new DarwinGamepadService();
  gService->Startup();
}

void StopGamepadMonitoring()
{
  if (!gService) {
    return;
  }

  gService->Shutdown();
  delete gService;
  gService = nullptr;
}

} // namespace dom
} // namespace mozilla