DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (ecaceb8b8295)

VCS Links

Line Code
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
/* -*- 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/. */

#include "VRManager.h"

#include "VRManagerParent.h"
#include "VRShMem.h"
#include "VRThread.h"
#include "gfxVR.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/dom/VRDisplay.h"
#include "mozilla/dom/GamepadEventTypes.h"
#include "mozilla/layers/TextureHost.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Unused.h"

#include "gfxVR.h"
#include <cstring>

#include "ipc/VRLayerParent.h"
#if !defined(MOZ_WIDGET_ANDROID)
#  include "VRServiceHost.h"
#endif

#ifdef XP_WIN
#  include "CompositorD3D11.h"
#  include "TextureD3D11.h"
#  include <d3d11.h>
#  include "gfxWindowsPlatform.h"
#  include "mozilla/gfx/DeviceManagerDx.h"
#elif defined(XP_MACOSX)
#  include "mozilla/gfx/MacIOSurface.h"
#  include <errno.h>
#elif defined(MOZ_WIDGET_ANDROID)
#  include <string.h>
#  include <pthread.h>
#  include "GeckoVRManager.h"
#  include "mozilla/layers/CompositorThread.h"
#endif  // defined(MOZ_WIDGET_ANDROID)

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gl;

namespace mozilla::gfx {

/**
 * When VR content is active, we run the tasks at 1ms
 * intervals, enabling multiple events to be processed
 * per frame, such as haptic feedback pulses.
 */
const uint32_t kVRActiveTaskInterval = 1;  // milliseconds

/**
 * When VR content is inactive, we run the tasks at 100ms
 * intervals, enabling VR display enumeration and
 * presentation startup to be relatively responsive
 * while not consuming unnecessary resources.
 */
const uint32_t kVRIdleTaskInterval = 100;  // milliseconds

/**
 * Max frame duration before the watchdog submits a new one.
 * Probably we can get rid of this when we enforce that SubmitFrame can only be
 * called in a VRDisplay loop.
 */
const double kVRMaxFrameSubmitDuration = 4000.0f;  // milliseconds

static StaticRefPtr<VRManager> sVRManagerSingleton;

/* static */
VRManager* VRManager::Get() {
  MOZ_ASSERT(sVRManagerSingleton != nullptr);
  MOZ_ASSERT(XRE_IsParentProcess() || XRE_IsGPUProcess());

  return sVRManagerSingleton;
}

/* static */
VRManager* VRManager::MaybeGet() {
  MOZ_ASSERT(XRE_IsParentProcess() || XRE_IsGPUProcess());

  return sVRManagerSingleton;
}

Atomic<uint32_t> VRManager::sDisplayBase(0);

/* static */
uint32_t VRManager::AllocateDisplayID() { return ++sDisplayBase; }

/*static*/
void VRManager::ManagerInit() {
  MOZ_ASSERT(NS_IsMainThread());

  // Enable gamepad extensions while VR is enabled.
  // Preference only can be set at the Parent process.
  if (StaticPrefs::dom_vr_enabled() && XRE_IsParentProcess()) {
    Preferences::SetBool("dom.gamepad.extensions.enabled", true);
  }

  if (sVRManagerSingleton == nullptr) {
    sVRManagerSingleton = new VRManager();
    ClearOnShutdown(&sVRManagerSingleton);
  }
}

VRManager::VRManager()
    : mState(VRManagerState::Disabled),
      mAccumulator100ms(0.0f),
      mRuntimeDetectionRequested(false),
      mRuntimeDetectionCompleted(false),
      mEnumerationRequested(false),
      mEnumerationCompleted(false),
      mVRDisplaysRequested(false),
      mVRDisplaysRequestedNonFocus(false),
      mVRControllersRequested(false),
      mFrameStarted(false),
      mTaskInterval(0),
      mCurrentSubmitTaskMonitor("CurrentSubmitTaskMonitor"),
      mCurrentSubmitTask(nullptr),
      mLastSubmittedFrameId(0),
      mLastStartedFrame(0),
      mRuntimeSupportFlags(VRDisplayCapabilityFlags::Cap_None),
      mAppPaused(false),
      mShmem(nullptr),
      mHapticPulseRemaining{},
      mDisplayInfo{},
      mLastUpdateDisplayInfo{},
      mBrowserState{},
      mLastSensorState{} {
  MOZ_ASSERT(sVRManagerSingleton == nullptr);
  MOZ_ASSERT(NS_IsMainThread());

#if !defined(MOZ_WIDGET_ANDROID)
  // XRE_IsGPUProcess() is helping us to check some platforms like
  // Win 7 try which are not using GPU process but VR process is enabled.
  mVRProcessEnabled =
      StaticPrefs::dom_vr_process_enabled_AtStartup() && XRE_IsGPUProcess();
  VRServiceHost::Init(mVRProcessEnabled);
  mServiceHost = VRServiceHost::Get();
  // We must shutdown before VRServiceHost, which is cleared
  // on ShutdownPhase::ShutdownFinal, potentially before VRManager.
  // We hold a reference to VRServiceHost to ensure it stays
  // alive until we have shut down.
#else
  // For Android, there is no VRProcess available and no VR service is
  // created, so default to false.
  mVRProcessEnabled = false;
#endif  // !defined(MOZ_WIDGET_ANDROID)

  nsCOMPtr<nsIObserverService> service = services::GetObserverService();
  if (service) {
    service->AddObserver(this, "application-background", false);
    service->AddObserver(this, "application-foreground", false);
  }
}

void VRManager::OpenShmem() {
  if (mShmem == nullptr) {
    mShmem = new VRShMem(nullptr, true /*aRequiresMutex*/);

#if !defined(MOZ_WIDGET_ANDROID)
    mShmem->CreateShMem(mVRProcessEnabled /*aCreateOnSharedMemory*/);
    // The VR Service accesses all hardware from a separate process
    // and replaces the other VRManager when enabled.
    // If the VR process is not enabled, create an in-process VRService.
    if (!mVRProcessEnabled) {
      // If the VR process is disabled, attempt to create a
      // VR service within the current process
      mServiceHost->CreateService(mShmem->GetExternalShmem());
      return;
    }
#else
    mShmem->CreateShMemForAndroid();
#endif
  } else {
    mShmem->ClearShMem();
  }

  // Reset local information for new connection
  mDisplayInfo.Clear();
  mLastUpdateDisplayInfo.Clear();
  mFrameStarted = false;
  mBrowserState.Clear();
  mLastSensorState.Clear();
  mEnumerationCompleted = false;
  mDisplayInfo.mGroupMask = kVRGroupContent;
}

void VRManager::CloseShmem() {
  if (mShmem != nullptr) {
    mShmem->CloseShMem();
    delete mShmem;
    mShmem = nullptr;
  }
}

VRManager::~VRManager() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mState == VRManagerState::Disabled);

  nsCOMPtr<nsIObserverService> service = services::GetObserverService();
  if (service) {
    service->RemoveObserver(this, "application-background");
    service->RemoveObserver(this, "application-foreground");
  }

#if !defined(MOZ_WIDGET_ANDROID)
  mServiceHost->Shutdown();
#endif
  CloseShmem();
}

void VRManager::AddLayer(VRLayerParent* aLayer) {
  mLayers.AppendElement(aLayer);
  mDisplayInfo.mPresentingGroups |= aLayer->GetGroup();
  if (mLayers.Length() == 1) {
    StartPresentation();
  }

  // Ensure that the content process receives the change immediately
  if (mState != VRManagerState::Enumeration &&
      mState != VRManagerState::RuntimeDetection) {
    DispatchVRDisplayInfoUpdate();
  }
}

void VRManager::RemoveLayer(VRLayerParent* aLayer) {
  mLayers.RemoveElement(aLayer);
  if (mLayers.Length() == 0) {
    StopPresentation();
  }
  mDisplayInfo.mPresentingGroups = 0;
  for (auto layer : mLayers) {
    mDisplayInfo.mPresentingGroups |= layer->GetGroup();
  }

  // Ensure that the content process receives the change immediately
  if (mState != VRManagerState::Enumeration &&
      mState != VRManagerState::RuntimeDetection) {
    DispatchVRDisplayInfoUpdate();
  }
}

void VRManager::AddVRManagerParent(VRManagerParent* aVRManagerParent) {
  mVRManagerParents.PutEntry(aVRManagerParent);
}

void VRManager::RemoveVRManagerParent(VRManagerParent* aVRManagerParent) {
  mVRManagerParents.RemoveEntry(aVRManagerParent);
  if (mVRManagerParents.IsEmpty()) {
    Destroy();
  }
}

void VRManager::UpdateRequestedDevices() {
  bool bHaveEventListener = false;
  bool bHaveEventListenerNonFocus = false;
  bool bHaveControllerListener = false;

  for (auto iter = mVRManagerParents.Iter(); !iter.Done(); iter.Next()) {
    VRManagerParent* vmp = iter.Get()->GetKey();
    bHaveEventListener |= vmp->HaveEventListener() && vmp->GetVRActiveStatus();
    bHaveEventListenerNonFocus |=
        vmp->HaveEventListener() && !vmp->GetVRActiveStatus();
    bHaveControllerListener |= vmp->HaveControllerListener();
  }

  mVRDisplaysRequested = bHaveEventListener;
  mVRDisplaysRequestedNonFocus = bHaveEventListenerNonFocus;
  // We only currently allow controllers to be used when
  // also activating a VR display
  mVRControllersRequested = mVRDisplaysRequested && bHaveControllerListener;
}

/**
 * VRManager::NotifyVsync must be called on every 2d vsync (usually at 60hz).
 * This must be called even when no WebVR site is active.
 * If we don't have a 2d display attached to the system, we can call this
 * at the VR display's native refresh rate.
 **/
void VRManager::NotifyVsync(const TimeStamp& aVsyncTimestamp) {
#if defined(XP_WIN) && defined(NIGHTLY_BUILD)
  // For Firefox Reality PC telemetry only.
  if (PR_GetEnv("MOZ_FXR")) {
    ProcessTelemetryEvent();
  }
#endif

  if (mState != VRManagerState::Active) {
    return;
  }
  /**
   * If the display isn't presenting, refresh the sensors and trigger
   * VRDisplay.requestAnimationFrame at the normal 2d display refresh rate.
   */
  if (mDisplayInfo.mPresentingGroups == 0) {
    StartFrame();
  }
}

void VRManager::StartTasks() {
  if (!mTaskTimer) {
    mTaskInterval = GetOptimalTaskInterval();
    mTaskTimer = NS_NewTimer();
    mTaskTimer->SetTarget(CompositorThreadHolder::Loop()->SerialEventTarget());
    mTaskTimer->InitWithNamedFuncCallback(
        TaskTimerCallback, this, mTaskInterval,
        nsITimer::TYPE_REPEATING_PRECISE_CAN_SKIP,
        "VRManager::TaskTimerCallback");
  }
}

void VRManager::StopTasks() {
  if (mTaskTimer) {
    mTaskTimer->Cancel();
    mTaskTimer = nullptr;
  }
}

/*static*/
void VRManager::TaskTimerCallback(nsITimer* aTimer, void* aClosure) {
  /**
   * It is safe to use the pointer passed in aClosure to reference the
   * VRManager object as the timer is canceled in VRManager::Destroy.
   * VRManager::Destroy set mState to VRManagerState::Disabled, which
   * is asserted in the VRManager destructor, guaranteeing that this
   * functions runs if and only if the VRManager object is valid.
   */
  VRManager* self = static_cast<VRManager*>(aClosure);
  self->RunTasks();

  if (self->mAppPaused) {
    // When the apps goes the background (e.g. Android) we should stop the
    // tasks.
    self->StopTasks();
    self->mState = VRManagerState::Idle;
  }
}

void VRManager::RunTasks() {
  // Will be called once every 1ms when a VR presentation
  // is active or once per vsync when a VR presentation is
  // not active.

  if (mState == VRManagerState::Disabled) {
    // We may have been destroyed but still have messages
    // in the queue from mTaskTimer.  Bail out to avoid
    // running them.
    return;
  }

  TimeStamp now = TimeStamp::Now();
  double lastTickMs = mAccumulator100ms;
  double deltaTime = 0.0f;
  if (!mLastTickTime.IsNull()) {
    deltaTime = (now - mLastTickTime).ToMilliseconds();
  }
  mAccumulator100ms += deltaTime;
  mLastTickTime = now;

  if (deltaTime > 0.0f && floor(mAccumulator100ms) != floor(lastTickMs)) {
    // Even if more than 1 ms has passed, we will only
    // execute Run1msTasks() once.
    Run1msTasks(deltaTime);
  }

  if (floor(mAccumulator100ms * 0.1f) != floor(lastTickMs * 0.1f)) {
    // Even if more than 10 ms has passed, we will only
    // execute Run10msTasks() once.
    Run10msTasks();
  }

  if (mAccumulator100ms >= 100.0f) {
    // Even if more than 100 ms has passed, we will only
    // execute Run100msTasks() once.
    Run100msTasks();
    mAccumulator100ms = fmod(mAccumulator100ms, 100.0f);
  }

  uint32_t optimalTaskInterval = GetOptimalTaskInterval();
  if (mTaskTimer && optimalTaskInterval != mTaskInterval) {
    mTaskTimer->SetDelay(optimalTaskInterval);
    mTaskInterval = optimalTaskInterval;
  }
}

uint32_t VRManager::GetOptimalTaskInterval() {
  /**
   * When either VR content is detected or VR hardware
   * has already been activated, we schedule tasks more
   * frequently.
   */
  bool wantGranularTasks = mVRDisplaysRequested || mVRControllersRequested ||
                           mDisplayInfo.mDisplayID != 0;
  if (wantGranularTasks) {
    return kVRActiveTaskInterval;
  }

  return kVRIdleTaskInterval;
}

/**
 * Run1msTasks() is guaranteed not to be
 * called more than once within 1ms.
 * When VR is not active, this will be
 * called once per VSync if it wasn't
 * called within the last 1ms.
 */
void VRManager::Run1msTasks(double aDeltaTime) { UpdateHaptics(aDeltaTime); }

/**
 * Run10msTasks() is guaranteed not to be
 * called more than once within 10ms.
 * When VR is not active, this will be
 * called once per VSync if it wasn't
 * called within the last 10ms.
 */
void VRManager::Run10msTasks() {
  UpdateRequestedDevices();
  CheckWatchDog();
  ExpireNavigationTransition();
  PullState();
  PushState();
}

/**
 * Run100msTasks() is guaranteed not to be
 * called more than once within 100ms.
 * When VR is not active, this will be
 * called once per VSync if it wasn't
 * called within the last 100ms.
 */
void VRManager::Run100msTasks() {
  // We must continually refresh the VR display enumeration to check
  // for events that we must fire such as Window.onvrdisplayconnect
  // Note that enumeration itself may activate display hardware, such
  // as Oculus, so we only do this when we know we are displaying content
  // that is looking for VR displays.
#if !defined(MOZ_WIDGET_ANDROID)
  mServiceHost->Refresh();
  CheckForPuppetCompletion();
#endif
  ProcessManagerState();
}

void VRManager::ProcessTelemetryEvent() {
  mozilla::gfx::VRShMem shmem(nullptr, true /*aRequiresMutex*/);
  MOZ_ASSERT(!shmem.HasExternalShmem());
  if (shmem.JoinShMem()) {
    mozilla::gfx::VRTelemetryState telemetryState = {0};
    shmem.PullTelemetryState(telemetryState);

    if (telemetryState.uid != 0) {
      if (telemetryState.installedFrom) {
        MOZ_ASSERT(telemetryState.installedFromValue <= 0x07,
                   "VRTelemetryId::INSTALLED_FROM only allows 3 bits.");
        Telemetry::Accumulate(Telemetry::FXRPC_FF_INSTALLATION_FROM,
                              telemetryState.installedFromValue);
      }
      if (telemetryState.entryMethod) {
        MOZ_ASSERT(telemetryState.entryMethodValue <= 0x07,
                   "VRTelemetryId::ENTRY_METHOD only allows 3 bits.");
        Telemetry::Accumulate(Telemetry::FXRPC_ENTRY_METHOD,
                              telemetryState.entryMethodValue);
      }
      if (telemetryState.firstRun) {
        Telemetry::ScalarSet(Telemetry::ScalarID::FXRPC_ISFIRSTRUN,
                             telemetryState.firstRunValue);
      }

      telemetryState = {0};
      shmem.PushTelemetryState(telemetryState);
    }
  }
}

void VRManager::CheckForInactiveTimeout() {
  // Shut down the VR devices when not in use
  if (mVRDisplaysRequested || mVRDisplaysRequestedNonFocus ||
      mVRControllersRequested || mEnumerationRequested ||
      mRuntimeDetectionRequested || mState == VRManagerState::Enumeration ||
      mState == VRManagerState::RuntimeDetection) {
    // We are using a VR device, keep it alive
    mLastActiveTime = TimeStamp::Now();
  } else if (mLastActiveTime.IsNull()) {
    Shutdown();
  } else {
    TimeDuration duration = TimeStamp::Now() - mLastActiveTime;
    if (duration.ToMilliseconds() > StaticPrefs::dom_vr_inactive_timeout()) {
      Shutdown();
      // We must not throttle the next enumeration request
      // after an idle timeout, as it may result in the
      // user needing to refresh the browser to detect
      // VR hardware when leaving and returning to a VR
      // site.
      mLastDisplayEnumerationTime = TimeStamp();
    }
  }
}

void VRManager::CheckForShutdown() {
  // Check for remote end shutdown
  if (mDisplayInfo.mDisplayState.shutdown) {
    Shutdown();
  }
}

#if !defined(MOZ_WIDGET_ANDROID)
void VRManager::CheckForPuppetCompletion() {
  // Notify content process about completion of puppet test resets
  if (mState != VRManagerState::Active) {
    for (auto iter = mManagerParentsWaitingForPuppetReset.Iter(); !iter.Done();
         iter.Next()) {
      Unused << iter.Get()->GetKey()->SendNotifyPuppetResetComplete();
    }
    mManagerParentsWaitingForPuppetReset.Clear();
  }
  // Notify content process about completion of puppet test scripts
  if (mManagerParentRunningPuppet) {
    if (mServiceHost->PuppetHasEnded()) {
      Unused << mManagerParentRunningPuppet
                    ->SendNotifyPuppetCommandBufferCompleted(true);
      mManagerParentRunningPuppet = nullptr;
    }
  }
}
#endif  // !defined(MOZ_WIDGET_ANDROID)

void VRManager::StartFrame() {
  if (mState != VRManagerState::Active) {
    return;
  }
  AUTO_PROFILER_TRACING_MARKER("VR", "GetSensorState", OTHER);

  /**
   * Do not start more VR frames until the last submitted frame is already
   * processed, or the last has stalled for more than
   * kVRMaxFrameSubmitDuration milliseconds.
   */
  TimeStamp now = TimeStamp::Now();
  const TimeStamp lastFrameStart =
      mLastFrameStart[mDisplayInfo.mFrameId % kVRMaxLatencyFrames];
  const bool isPresenting = mLastUpdateDisplayInfo.GetPresentingGroups() != 0;
  double duration =
      lastFrameStart.IsNull() ? 0.0 : (now - lastFrameStart).ToMilliseconds();
  if (isPresenting && mLastStartedFrame > 0 &&
      mDisplayInfo.mDisplayState.lastSubmittedFrameId < mLastStartedFrame &&
      duration < kVRMaxFrameSubmitDuration) {
    return;
  }

  mDisplayInfo.mFrameId++;
  size_t bufferIndex = mDisplayInfo.mFrameId % kVRMaxLatencyFrames;
  mDisplayInfo.mLastSensorState[bufferIndex] = mLastSensorState;
  mLastFrameStart[bufferIndex] = now;
  mFrameStarted = true;
  mLastStartedFrame = mDisplayInfo.mFrameId;

  DispatchVRDisplayInfoUpdate();
}

void VRManager::DetectRuntimes() {
  if (mState == VRManagerState::RuntimeDetection) {
    // Runtime detection has already been started.
    // This additional request will also receive the
    // result from the first request.
    return;
  }

  // Detect XR runtimes to determine if they are
  // capable of supporting VR or AR sessions, while
  // avoiding activating any XR devices or persistent
  // background software.
  if (mRuntimeDetectionCompleted) {
    // We have already detected runtimes, so we can
    // immediately respond with the same results.
    // This will require the user to restart the browser
    // after installing or removing an XR device
    // runtime.
    DispatchRuntimeCapabilitiesUpdate();
    return;
  }
  mRuntimeDetectionRequested = true;
  ProcessManagerState();
}

void VRManager::EnumerateDevices() {
  if (mState == VRManagerState::Enumeration) {
    // Enumeration has already been started.
    // This additional request will also receive the
    // result from the first request.
    return;
  }
  // Activate XR runtimes and enumerate XR devices.
  mEnumerationRequested = true;
  ProcessManagerState();
}

void VRManager::ProcessManagerState() {
  switch (mState) {
    case VRManagerState::Disabled:
      ProcessManagerState_Disabled();
      break;
    case VRManagerState::Idle:
      ProcessManagerState_Idle();
      break;
    case VRManagerState::RuntimeDetection:
      ProcessManagerState_DetectRuntimes();
      break;
    case VRManagerState::Enumeration:
      ProcessManagerState_Enumeration();
      break;
    case VRManagerState::Active:
      ProcessManagerState_Active();
      break;
    case VRManagerState::Stopping:
      ProcessManagerState_Stopping();
      break;
  }
  CheckForInactiveTimeout();
  CheckForShutdown();
}

void VRManager::ProcessManagerState_Disabled() {
  MOZ_ASSERT(mState == VRManagerState::Disabled);

  if (!StaticPrefs::dom_vr_enabled()) {
    return;
  }

  if (mRuntimeDetectionRequested || mEnumerationRequested ||
      mVRDisplaysRequested) {
    StartTasks();
    mState = VRManagerState::Idle;
  }
}

void VRManager::ProcessManagerState_Stopping() {
  MOZ_ASSERT(mState == VRManagerState::Stopping);
  PullState();
  /**
   * In the case of Desktop, the VRService shuts itself down.
   * Before it's finished stopping, it sets a flag in the ShMem
   * to let VRManager know that it's done.  VRManager watches for
   * this flag and transitions out of the VRManagerState::Stopping
   * state to VRManagerState::Idle.
   */
#if defined(MOZ_WIDGET_ANDROID)
  // On Android, the VR service never actually shuts
  // down or requests VRManager to stop.
  Shutdown();
#endif  // defined(MOZ_WIDGET_ANDROID)
}

void VRManager::ProcessManagerState_Idle_StartEnumeration() {
  MOZ_ASSERT(mState == VRManagerState::Idle);

  if (!mEarliestRestartTime.IsNull() &&
      mEarliestRestartTime > TimeStamp::Now()) {
    // When the VR Service shuts down it informs us of how long we
    // must wait until we can re-start it.
    // We must wait until mEarliestRestartTime before attempting
    // to enumerate again.
    return;
  }

  /**
   * Throttle the rate of enumeration to the interval set in
   * VRDisplayEnumerateInterval
   */
  if (!mLastDisplayEnumerationTime.IsNull()) {
    TimeDuration duration = TimeStamp::Now() - mLastDisplayEnumerationTime;
    if (duration.ToMilliseconds() <
        StaticPrefs::dom_vr_display_enumerate_interval()) {
      return;
    }
  }

  /**
   * If we get this far, don't try again until
   * the VRDisplayEnumerateInterval elapses
   */
  mLastDisplayEnumerationTime = TimeStamp::Now();

  OpenShmem();

  mEnumerationRequested = false;
  // We must block until enumeration has completed in order
  // to signal that the WebVR promise should be resolved at the
  // right time.
#if defined(MOZ_WIDGET_ANDROID)
  // In Android, we need to make sure calling
  // GeckoVRManager::SetExternalContext() from an external VR service
  // before doing enumeration.
  if (!mShmem->GetExternalShmem()) {
    mShmem->CreateShMemForAndroid();
  }
  if (mShmem->GetExternalShmem()) {
    mState = VRManagerState::Enumeration;
  } else {
    // Not connected to shmem, so no devices to enumerate.
    mDisplayInfo.Clear();
    DispatchVRDisplayInfoUpdate();
  }
#else

  PushState();

  /**
   * We must start the VR Service thread
   * and VR Process before enumeration.
   * We don't want to start this until we will
   * actualy enumerate, to avoid continuously
   * re-launching the thread/process when
   * no hardware is found or a VR software update
   * is in progress
   */
  mServiceHost->StartService();
  mState = VRManagerState::Enumeration;
#endif  // MOZ_WIDGET_ANDROID
}

void VRManager::ProcessManagerState_Idle_StartRuntimeDetection() {
  MOZ_ASSERT(mState == VRManagerState::Idle);

  OpenShmem();
  mBrowserState.detectRuntimesOnly = true;
  mRuntimeDetectionRequested = false;

  // We must block until enumeration has completed in order
  // to signal that the WebVR promise should be resolved at the
  // right time.
#if defined(MOZ_WIDGET_ANDROID)
  // In Android, we need to make sure calling
  // GeckoVRManager::SetExternalContext() from an external VR service
  // before doing enumeration.
  if (!mShmem->GetExternalShmem()) {
    mShmem->CreateShMemForAndroid();
  }
  if (mShmem->GetExternalShmem()) {
    mState = VRManagerState::RuntimeDetection;
  } else {
    // Not connected to shmem, so no runtimes to detect.
    mRuntimeSupportFlags = VRDisplayCapabilityFlags::Cap_None;
    mRuntimeDetectionCompleted = true;
    DispatchRuntimeCapabilitiesUpdate();
  }
#else

  PushState();

  /**
   * We must start the VR Service thread
   * and VR Process before enumeration.
   * We don't want to start this until we will
   * actualy enumerate, to avoid continuously
   * re-launching the thread/process when
   * no hardware is found or a VR software update
   * is in progress
   */
  mServiceHost->StartService();
  mState = VRManagerState::RuntimeDetection;
#endif  // MOZ_WIDGET_ANDROID
}

void VRManager::ProcessManagerState_Idle() {
  MOZ_ASSERT(mState == VRManagerState::Idle);

  if (!mRuntimeDetectionCompleted) {
    // Check if we should start detecting runtimes
    // We must alwasy detect runtimes before doing anything
    // else with the VR process.
    // This will happen only once per browser startup.
    if (mRuntimeDetectionRequested || mEnumerationRequested) {
      ProcessManagerState_Idle_StartRuntimeDetection();
    }
    return;
  }

  // Check if we should start activating enumerating XR hardware
  if (mRuntimeDetectionCompleted &&
      (mVRDisplaysRequested || mEnumerationRequested)) {
    ProcessManagerState_Idle_StartEnumeration();
  }
}

void VRManager::ProcessManagerState_DetectRuntimes() {
  MOZ_ASSERT(mState == VRManagerState::RuntimeDetection);
  MOZ_ASSERT(mShmem != nullptr);

  PullState();
  if (mEnumerationCompleted) {
    /**
     * When mBrowserState.detectRuntimesOnly is set, the
     * VRService and VR process will shut themselves down
     * automatically after detecting runtimes.
     * mEnumerationCompleted is also used in this case,
     * but to mean "enumeration of runtimes" not
     * "enumeration of VR devices".
     *
     * We set mState to `VRManagerState::Stopping`
     * to make sure that we don't try to do anything
     * else with the active VRService until it has stopped.
     * We must start another one when an XR session will be
     * requested.
     *
     * This logic is optimized for the WebXR design, but still
     * works for WebVR so it can continue to function until
     * deprecated and removed.
     */
    mState = VRManagerState::Stopping;
    mRuntimeSupportFlags = mDisplayInfo.mDisplayState.capabilityFlags &
                           (VRDisplayCapabilityFlags::Cap_ImmersiveVR |
                            VRDisplayCapabilityFlags::Cap_ImmersiveAR);
    mRuntimeDetectionCompleted = true;
    DispatchRuntimeCapabilitiesUpdate();
  }
}

void VRManager::ProcessManagerState_Enumeration() {
  MOZ_ASSERT(mState == VRManagerState::Enumeration);
  MOZ_ASSERT(mShmem != nullptr);

  PullState();
  if (mEnumerationCompleted) {
    if (mDisplayInfo.mDisplayState.isConnected) {
      mDisplayInfo.mDisplayID = VRManager::AllocateDisplayID();
      mState = VRManagerState::Active;
    } else {
      mDisplayInfo.Clear();
      mState = VRManagerState::Stopping;
    }
    DispatchVRDisplayInfoUpdate();
  }
}

void VRManager::ProcessManagerState_Active() {
  MOZ_ASSERT(mState == VRManagerState::Active);

  if (mDisplayInfo != mLastUpdateDisplayInfo) {
    // While the display is active, send continuous updates
    DispatchVRDisplayInfoUpdate();
  }
}

void VRManager::DispatchVRDisplayInfoUpdate() {
  for (auto iter = mVRManagerParents.Iter(); !iter.Done(); iter.Next()) {
    Unused << iter.Get()->GetKey()->SendUpdateDisplayInfo(mDisplayInfo);
  }
  mLastUpdateDisplayInfo = mDisplayInfo;
}

void VRManager::DispatchRuntimeCapabilitiesUpdate() {
  VRDisplayCapabilityFlags flags = mRuntimeSupportFlags;
  if (StaticPrefs::dom_vr_always_support_vr()) {
    flags |= VRDisplayCapabilityFlags::Cap_ImmersiveVR;
  }

  if (StaticPrefs::dom_vr_always_support_ar()) {
    flags |= VRDisplayCapabilityFlags::Cap_ImmersiveAR;
  }

  for (auto iter = mVRManagerParents.Iter(); !iter.Done(); iter.Next()) {
    Unused << iter.Get()->GetKey()->SendUpdateRuntimeCapabilities(flags);
  }
}

void VRManager::StopAllHaptics() {
  for (size_t i = 0; i < mozilla::ArrayLength(mBrowserState.hapticState); i++) {
    ClearHapticSlot(i);
  }
  PushState();
}

void VRManager::VibrateHaptic(uint32_t aControllerIdx, uint32_t aHapticIndex,
                              double aIntensity, double aDuration,
                              const VRManagerPromise& aPromise)

{
  if (mState != VRManagerState::Active) {
    return;
  }
  // VRDisplayClient::FireGamepadEvents() assigns a controller ID with
  // ranges based on displayID.  We must translate this to the indexes
  // understood by VRDisplayExternal.
  uint32_t controllerBaseIndex =
      kVRControllerMaxCount * mDisplayInfo.mDisplayID;
  uint32_t controllerIndex = aControllerIdx - controllerBaseIndex;

  TimeStamp now = TimeStamp::Now();
  size_t bestSlotIndex = 0;
  // Default to an empty slot, or the slot holding the oldest haptic pulse
  for (size_t i = 0; i < mozilla::ArrayLength(mBrowserState.hapticState); i++) {
    const VRHapticState& state = mBrowserState.hapticState[i];
    if (state.inputFrameID == 0) {
      // Unused slot, use it
      bestSlotIndex = i;
      break;
    }
    if (mHapticPulseRemaining[i] < mHapticPulseRemaining[bestSlotIndex]) {
      // If no empty slots are available, fall back to overriding
      // the pulse which is ending soonest.
      bestSlotIndex = i;
    }
  }
  // Override the last pulse on the same actuator if present.
  for (size_t i = 0; i < mozilla::ArrayLength(mBrowserState.hapticState); i++) {
    const VRHapticState& state = mBrowserState.hapticState[i];
    if (state.inputFrameID == 0) {
      // This is an empty slot -- no match
      continue;
    }
    if (state.controllerIndex == controllerIndex &&
        state.hapticIndex == aHapticIndex) {
      // Found pulse on same actuator -- let's override it.
      bestSlotIndex = i;
    }
  }
  ClearHapticSlot(bestSlotIndex);

  // Populate the selected slot with new haptic state
  size_t bufferIndex = mDisplayInfo.mFrameId % kVRMaxLatencyFrames;
  VRHapticState& bestSlot = mBrowserState.hapticState[bestSlotIndex];
  bestSlot.inputFrameID =
      mDisplayInfo.mLastSensorState[bufferIndex].inputFrameID;
  bestSlot.controllerIndex = controllerIndex;
  bestSlot.hapticIndex = aHapticIndex;
  bestSlot.pulseStart = (float)(now - mLastFrameStart[bufferIndex]).ToSeconds();
  bestSlot.pulseDuration =
      (float)aDuration * 0.001f;  // Convert from ms to seconds
  bestSlot.pulseIntensity = (float)aIntensity;

  mHapticPulseRemaining[bestSlotIndex] = aDuration;
  MOZ_ASSERT(bestSlotIndex <= mHapticPromises.Length());
  if (bestSlotIndex == mHapticPromises.Length()) {
    mHapticPromises.AppendElement(
        UniquePtr<VRManagerPromise>(new VRManagerPromise(aPromise)));
  } else {
    mHapticPromises[bestSlotIndex] =
        UniquePtr<VRManagerPromise>(new VRManagerPromise(aPromise));
  }
  PushState();
}

void VRManager::StopVibrateHaptic(uint32_t aControllerIdx) {
  if (mState != VRManagerState::Active) {
    return;
  }
  // VRDisplayClient::FireGamepadEvents() assigns a controller ID with
  // ranges based on displayID.  We must translate this to the indexes
  // understood by VRDisplayExternal.
  uint32_t controllerBaseIndex =
      kVRControllerMaxCount * mDisplayInfo.mDisplayID;
  uint32_t controllerIndex = aControllerIdx - controllerBaseIndex;

  for (size_t i = 0; i < mozilla::ArrayLength(mBrowserState.hapticState); i++) {
    VRHapticState& state = mBrowserState.hapticState[i];
    if (state.controllerIndex == controllerIndex) {
      memset(&state, 0, sizeof(VRHapticState));
    }
  }
  PushState();
}

void VRManager::NotifyVibrateHapticCompleted(const VRManagerPromise& aPromise) {
  aPromise.mParent->SendReplyGamepadVibrateHaptic(aPromise.mPromiseID);
}

void VRManager::StartVRNavigation(const uint32_t& aDisplayID) {
  if (mState != VRManagerState::Active) {
    return;
  }
  /**
   * We only support a single VRSession with a single VR display at a
   * time; however, due to the asynchronous nature of the API, it's possible
   * that the previously used VR display was a different one than the one now
   * allocated. We catch these cases to avoid automatically activating the new
   * VR displays. This situation is expected to be very rare and possibly never
   * seen. Perhaps further simplification could be made in the content process
   * code which passes around displayID's that may no longer be needed.
   **/
  if (mDisplayInfo.GetDisplayID() != aDisplayID) {
    return;
  }
  mBrowserState.navigationTransitionActive = true;
  mVRNavigationTransitionEnd = TimeStamp();
  PushState();
}

void VRManager::StopVRNavigation(const uint32_t& aDisplayID,
                                 const TimeDuration& aTimeout) {
  if (mState != VRManagerState::Active) {
    return;
  }
  if (mDisplayInfo.GetDisplayID() != aDisplayID) {
    return;
  }
  if (aTimeout.ToMilliseconds() <= 0) {
    mBrowserState.navigationTransitionActive = false;
    mVRNavigationTransitionEnd = TimeStamp();
    PushState();
  }
  mVRNavigationTransitionEnd = TimeStamp::Now() + aTimeout;
}

#if !defined(MOZ_WIDGET_ANDROID)

bool VRManager::RunPuppet(const nsTArray<uint64_t>& aBuffer,
                          VRManagerParent* aManagerParent) {
  if (!StaticPrefs::dom_vr_puppet_enabled()) {
    // Sanity check to ensure that a compromised content process
    // can't use this to escalate permissions.
    return false;
  }
  if (mManagerParentRunningPuppet != nullptr) {
    // Only one parent may run a puppet at a time
    return false;
  }
  mManagerParentRunningPuppet = aManagerParent;
  mServiceHost->PuppetSubmit(aBuffer);
  return true;
}

void VRManager::ResetPuppet(VRManagerParent* aManagerParent) {
  mManagerParentsWaitingForPuppetReset.PutEntry(aManagerParent);
  if (mManagerParentRunningPuppet != nullptr) {
    Unused << mManagerParentRunningPuppet
                  ->SendNotifyPuppetCommandBufferCompleted(false);
    mManagerParentRunningPuppet = nullptr;
  }
  mServiceHost->PuppetReset();
  // In the event that we are shut down, the task timer won't be running
  // to trigger CheckForPuppetCompletion.
  // In this case, CheckForPuppetCompletion() would immediately resolve
  // the promises for mManagerParentsWaitingForPuppetReset.
  // We can simply call it once here to handle that case.
  CheckForPuppetCompletion();
}

#endif  // !defined(MOZ_WIDGET_ANDROID)

void VRManager::PullState(
    const std::function<bool()>& aWaitCondition /* = nullptr */) {
  if (mShmem != nullptr) {
    mShmem->PullSystemState(mDisplayInfo.mDisplayState, mLastSensorState,
                            mDisplayInfo.mControllerState,
                            mEnumerationCompleted, aWaitCondition);
  }
}

void VRManager::PushState(bool aNotifyCond) {
  if (mShmem != nullptr) {
    mShmem->PushBrowserState(mBrowserState, aNotifyCond);
  }
}

void VRManager::Destroy() {
  if (mState == VRManagerState::Disabled) {
    return;
  }
  Shutdown();
  StopTasks();
  mState = VRManagerState::Disabled;
}

void VRManager::Shutdown() {
  if (mState == VRManagerState::Disabled || mState == VRManagerState::Idle) {
    return;
  }

  if (mDisplayInfo.mDisplayState.shutdown) {
    // Shutdown was requested by VR Service, so we must throttle
    // as requested by the VR Service
    TimeStamp now = TimeStamp::Now();
    mEarliestRestartTime =
        now + TimeDuration::FromMilliseconds(
                  (double)mDisplayInfo.mDisplayState.minRestartInterval);
  }

  StopAllHaptics();
  StopPresentation();
  CancelCurrentSubmitTask();
  ShutdownSubmitThread();

  mDisplayInfo.Clear();
  mEnumerationCompleted = false;

  if (mState == VRManagerState::RuntimeDetection) {
    /**
     * We have failed to detect runtimes before shutting down.
     * Ensure that promises are resolved
     *
     * This call to DispatchRuntimeCapabilitiesUpdate will only
     * happen when we have failed to detect runtimes. In that case,
     * mRuntimeSupportFlags will be 0 and send the correct message
     * to the content process.
     *
     * When we are successful, we store the result in mRuntimeSupportFlags
     * and never try again unless the browser is restarted. mRuntimeSupportFlags
     * is never reset back to 0 in that case but we will never re-enter the
     * VRManagerState::RuntimeDetection state and hit this code path again.
     */
    DispatchRuntimeCapabilitiesUpdate();
  }

  if (mState == VRManagerState::Enumeration) {
    // We have failed to enumerate VR devices before shutting down.
    // Ensure that promises are resolved
    DispatchVRDisplayInfoUpdate();
  }

#if !defined(MOZ_WIDGET_ANDROID)
  mServiceHost->StopService();
#endif
  mState = VRManagerState::Idle;

  // We will close Shmem in the DTOR to avoid
  // mSubmitThread is still running but its shmem
  // has been released.
}

void VRManager::ShutdownVRManagerParents() {
  // Close removes the CanvasParent from the set so take a copy first.
  VRManagerParentSet vrManagerParents;
  for (auto iter = mVRManagerParents.Iter(); !iter.Done(); iter.Next()) {
    vrManagerParents.PutEntry(iter.Get()->GetKey());
  }

  for (auto iter = vrManagerParents.Iter(); !iter.Done(); iter.Next()) {
    iter.Get()->GetKey()->Close();
    iter.Remove();
  }

  MOZ_DIAGNOSTIC_ASSERT(mVRManagerParents.IsEmpty(),
                        "Closing should have cleared all entries.");
}

void VRManager::CheckWatchDog() {
  /**
   * We will trigger a new frame immediately after a successful frame
   * texture submission.  If content fails to call VRDisplay.submitFrame
   * after dom.vr.display.rafMaxDuration milliseconds has elapsed since the
   * last VRDisplay.requestAnimationFrame, we act as a "watchdog" and
   * kick-off a new VRDisplay.requestAnimationFrame to avoid a render loop
   * stall and to give content a chance to recover.
   *
   * If the lower level VR platform API's are rejecting submitted frames,
   * such as when the Oculus "Health and Safety Warning" is displayed,
   * we will not kick off the next frame immediately after
   * VRDisplay.submitFrame as it would result in an unthrottled render loop
   * that would free run at potentially extreme frame rates.  To ensure that
   * content has a chance to resume its presentation when the frames are
   * accepted once again, we rely on this "watchdog" to act as a VR refresh
   * driver cycling at a rate defined by dom.vr.display.rafMaxDuration.
   *
   * This number must be larger than the slowest expected frame time during
   * normal VR presentation, but small enough not to break content that
   * makes assumptions of reasonably minimal VSync rate.
   *
   * The slowest expected refresh rate for a VR display currently is an
   * Oculus CV1 when ASW (Asynchronous Space Warp) is enabled, at 45hz.
   * A dom.vr.display.rafMaxDuration value of 50 milliseconds results in a
   * 20hz rate, which avoids inadvertent triggering of the watchdog during
   * Oculus ASW even if every second frame is dropped.
   */
  if (mState != VRManagerState::Active) {
    return;
  }
  bool bShouldStartFrame = false;

  // If content fails to call VRDisplay.submitFrame, we must eventually
  // time-out and trigger a new frame.
  TimeStamp lastFrameStart =
      mLastFrameStart[mDisplayInfo.mFrameId % kVRMaxLatencyFrames];
  if (lastFrameStart.IsNull()) {
    bShouldStartFrame = true;
  } else {
    TimeDuration duration = TimeStamp::Now() - lastFrameStart;
    if (duration.ToMilliseconds() >
        StaticPrefs::dom_vr_display_rafMaxDuration()) {
      bShouldStartFrame = true;
    }
  }

  if (bShouldStartFrame) {
    StartFrame();
  }
}

void VRManager::ExpireNavigationTransition() {
  if (mState != VRManagerState::Active) {
    return;
  }
  if (!mVRNavigationTransitionEnd.IsNull() &&
      TimeStamp::Now() > mVRNavigationTransitionEnd) {
    mBrowserState.navigationTransitionActive = false;
  }
}

void VRManager::UpdateHaptics(double aDeltaTime) {
  if (mState != VRManagerState::Active) {
    return;
  }
  bool bNeedPush = false;
  // Check for any haptic pulses that have ended and clear them
  for (size_t i = 0; i < mozilla::ArrayLength(mBrowserState.hapticState); i++) {
    const VRHapticState& state = mBrowserState.hapticState[i];
    if (state.inputFrameID == 0) {
      // Nothing in this slot
      continue;
    }
    mHapticPulseRemaining[i] -= aDeltaTime;
    if (mHapticPulseRemaining[i] <= 0.0f) {
      // The pulse has finished
      ClearHapticSlot(i);
      bNeedPush = true;
    }
  }
  if (bNeedPush) {
    PushState();
  }
}

void VRManager::ClearHapticSlot(size_t aSlot) {
  MOZ_ASSERT(aSlot < mozilla::ArrayLength(mBrowserState.hapticState));
  memset(&mBrowserState.hapticState[aSlot], 0, sizeof(VRHapticState));
  mHapticPulseRemaining[aSlot] = 0.0f;
  if (aSlot < mHapticPromises.Length() && mHapticPromises[aSlot]) {
    NotifyVibrateHapticCompleted(*(mHapticPromises[aSlot]));
    mHapticPromises[aSlot] = nullptr;
  }
}

void VRManager::ShutdownSubmitThread() {
  if (mSubmitThread) {
    mSubmitThread->Shutdown();
    mSubmitThread = nullptr;
  }
}

void VRManager::StartPresentation() {
  if (mState != VRManagerState::Active) {
    return;
  }
  if (mBrowserState.presentationActive) {
    return;
  }
  mTelemetry.Clear();
  mTelemetry.mPresentationStart = TimeStamp::Now();

  // Indicate that we are ready to start immersive mode
  mBrowserState.presentationActive = true;
  mBrowserState.layerState[0].type = VRLayerType::LayerType_Stereo_Immersive;
  PushState();

  mDisplayInfo.mDisplayState.lastSubmittedFrameId = 0;
  if (mDisplayInfo.mDisplayState.reportsDroppedFrames) {
    mTelemetry.mLastDroppedFrameCount =
        mDisplayInfo.mDisplayState.droppedFrameCount;
  }

  mLastSubmittedFrameId = 0;
  mLastStartedFrame = 0;
}

void VRManager::StopPresentation() {
  if (mState != VRManagerState::Active) {
    return;
  }
  if (!mBrowserState.presentationActive) {
    return;
  }

  // Indicate that we have stopped immersive mode
  mBrowserState.presentationActive = false;
  memset(mBrowserState.layerState, 0,
         sizeof(VRLayerState) * mozilla::ArrayLength(mBrowserState.layerState));

  PushState(true);

  Telemetry::HistogramID timeSpentID = Telemetry::HistogramCount;
  Telemetry::HistogramID droppedFramesID = Telemetry::HistogramCount;
  int viewIn = 0;

  if (mDisplayInfo.mDisplayState.eightCC ==
      GFX_VR_EIGHTCC('O', 'c', 'u', 'l', 'u', 's', ' ', 'D')) {
    // Oculus Desktop API
    timeSpentID = Telemetry::WEBVR_TIME_SPENT_VIEWING_IN_OCULUS;
    droppedFramesID = Telemetry::WEBVR_DROPPED_FRAMES_IN_OCULUS;
    viewIn = 1;
  } else if (mDisplayInfo.mDisplayState.eightCC ==
             GFX_VR_EIGHTCC('O', 'p', 'e', 'n', 'V', 'R', ' ', ' ')) {
    // OpenVR API
    timeSpentID = Telemetry::WEBVR_TIME_SPENT_VIEWING_IN_OPENVR;
    droppedFramesID = Telemetry::WEBVR_DROPPED_FRAMES_IN_OPENVR;
    viewIn = 2;
  }

  if (viewIn) {
    const TimeDuration duration =
        TimeStamp::Now() - mTelemetry.mPresentationStart;
    Telemetry::Accumulate(Telemetry::WEBVR_USERS_VIEW_IN, viewIn);
    Telemetry::Accumulate(timeSpentID, duration.ToMilliseconds());
    const uint32_t droppedFramesPerSec =
        (uint32_t)((double)(mDisplayInfo.mDisplayState.droppedFrameCount -
                            mTelemetry.mLastDroppedFrameCount) /
                   duration.ToSeconds());
    Telemetry::Accumulate(droppedFramesID, droppedFramesPerSec);
  }
}

bool VRManager::IsPresenting() {
  if (mShmem) {
    return mDisplayInfo.mPresentingGroups != 0;
  }
  return false;
}

void VRManager::SetGroupMask(uint32_t aGroupMask) {
  if (mState != VRManagerState::Active) {
    return;
  }
  mDisplayInfo.mGroupMask = aGroupMask;
}

void VRManager::SubmitFrame(VRLayerParent* aLayer,
                            const layers::SurfaceDescriptor& aTexture,
                            uint64_t aFrameId, const gfx::Rect& aLeftEyeRect,
                            const gfx::Rect& aRightEyeRect) {
  if (mState != VRManagerState::Active) {
    return;
  }
  MonitorAutoLock lock(mCurrentSubmitTaskMonitor);
  if ((mDisplayInfo.mGroupMask & aLayer->GetGroup()) == 0) {
    // Suppress layers hidden by the group mask
    return;
  }

  // Ensure that we only accept the first SubmitFrame call per RAF cycle.
  if (!mFrameStarted || aFrameId != mDisplayInfo.mFrameId) {
    return;
  }

  /**
   * Do not queue more submit frames until the last submitted frame is
   * already processed and the new WebGL texture is ready.
   */
  if (mLastSubmittedFrameId > 0 &&
      mLastSubmittedFrameId !=
          mDisplayInfo.mDisplayState.lastSubmittedFrameId) {
    mLastStartedFrame = 0;
    return;
  }

  mLastSubmittedFrameId = aFrameId;

  mFrameStarted = false;

  RefPtr<CancelableRunnable> task = NewCancelableRunnableMethod<
      StoreCopyPassByConstLRef<layers::SurfaceDescriptor>, uint64_t,
      StoreCopyPassByConstLRef<gfx::Rect>, StoreCopyPassByConstLRef<gfx::Rect>>(
      "gfx::VRManager::SubmitFrameInternal", this,
      &VRManager::SubmitFrameInternal, aTexture, aFrameId, aLeftEyeRect,
      aRightEyeRect);

  if (!mCurrentSubmitTask) {
    mCurrentSubmitTask = task;
#if !defined(MOZ_WIDGET_ANDROID)
    if (!mSubmitThread) {
      mSubmitThread = new VRThread(NS_LITERAL_CSTRING("VR_SubmitFrame"));
    }
    mSubmitThread->Start();
    mSubmitThread->PostTask(task.forget());
#else
    CompositorThreadHolder::Loop()->PostTask(task.forget());
#endif  // defined(MOZ_WIDGET_ANDROID)
  }
}

bool VRManager::SubmitFrame(const layers::SurfaceDescriptor& aTexture,
                            uint64_t aFrameId, const gfx::Rect& aLeftEyeRect,
                            const gfx::Rect& aRightEyeRect) {
  if (mState != VRManagerState::Active) {
    return false;
  }
#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_ANDROID)
  MOZ_ASSERT(mBrowserState.layerState[0].type ==
             VRLayerType::LayerType_Stereo_Immersive);
  VRLayer_Stereo_Immersive& layer =
      mBrowserState.layerState[0].layer_stereo_immersive;

  switch (aTexture.type()) {
#  if defined(XP_WIN)
    case SurfaceDescriptor::TSurfaceDescriptorD3D10: {
      const SurfaceDescriptorD3D10& surf =
          aTexture.get_SurfaceDescriptorD3D10();
      layer.textureType =
          VRLayerTextureType::LayerTextureType_D3D10SurfaceDescriptor;
      layer.textureHandle = (void*)surf.handle();
      layer.textureSize.width = surf.size().width;
      layer.textureSize.height = surf.size().height;
    } break;
#  elif defined(XP_MACOSX)
    case SurfaceDescriptor::TSurfaceDescriptorMacIOSurface: {
      // MacIOSurface ptr can't be fetched or used at different threads.
      // Both of fetching and using this MacIOSurface are at the VRService
      // thread.
      const auto& desc = aTexture.get_SurfaceDescriptorMacIOSurface();
      layer.textureType = VRLayerTextureType::LayerTextureType_MacIOSurface;
      layer.textureHandle = desc.surfaceId();
      RefPtr<MacIOSurface> surf =
          MacIOSurface::LookupSurface(desc.surfaceId(), desc.scaleFactor(),
                                      !desc.isOpaque(), desc.yUVColorSpace());
      if (surf) {
        layer.textureSize.width = surf->GetDevicePixelWidth();
        layer.textureSize.height = surf->GetDevicePixelHeight();
      }
    } break;
#  elif defined(MOZ_WIDGET_ANDROID)
    case SurfaceDescriptor::TSurfaceTextureDescriptor: {
      const SurfaceTextureDescriptor& desc =
          aTexture.get_SurfaceTextureDescriptor();
      java::GeckoSurfaceTexture::LocalRef surfaceTexture =
          java::GeckoSurfaceTexture::Lookup(desc.handle());
      if (!surfaceTexture) {
        NS_WARNING("VRManager::SubmitFrame failed to get a SurfaceTexture");
        return false;
      }
      layer.textureType =
          VRLayerTextureType::LayerTextureType_GeckoSurfaceTexture;
      layer.textureHandle = desc.handle();
      layer.textureSize.width = desc.size().width;
      layer.textureSize.height = desc.size().height;
    } break;
#  endif
    default: {
      MOZ_ASSERT(false);
      return false;
    }
  }

  layer.frameId = aFrameId;
  layer.inputFrameId =
      mDisplayInfo.mLastSensorState[mDisplayInfo.mFrameId % kVRMaxLatencyFrames]
          .inputFrameID;

  layer.leftEyeRect.x = aLeftEyeRect.x;
  layer.leftEyeRect.y = aLeftEyeRect.y;
  layer.leftEyeRect.width = aLeftEyeRect.width;
  layer.leftEyeRect.height = aLeftEyeRect.height;
  layer.rightEyeRect.x = aRightEyeRect.x;
  layer.rightEyeRect.y = aRightEyeRect.y;
  layer.rightEyeRect.width = aRightEyeRect.width;
  layer.rightEyeRect.height = aRightEyeRect.height;

  PushState(true);

  PullState([&]() {
    return (mDisplayInfo.mDisplayState.lastSubmittedFrameId >= aFrameId) ||
           mDisplayInfo.mDisplayState.suppressFrames ||
           !mDisplayInfo.mDisplayState.isConnected;
  });

  if (mDisplayInfo.mDisplayState.suppressFrames ||
      !mDisplayInfo.mDisplayState.isConnected) {
    // External implementation wants to supress frames, service has shut
    // down or hardware has been disconnected.
    return false;
  }

  return mDisplayInfo.mDisplayState.lastSubmittedFrameSuccessful;
#else
  MOZ_ASSERT(false);  // Not implmented for this platform
  return false;
#endif
}

void VRManager::SubmitFrameInternal(const layers::SurfaceDescriptor& aTexture,
                                    uint64_t aFrameId,
                                    const gfx::Rect& aLeftEyeRect,
                                    const gfx::Rect& aRightEyeRect) {
#if !defined(MOZ_WIDGET_ANDROID)
  MOZ_ASSERT(mSubmitThread->GetThread() == NS_GetCurrentThread());
#endif  // !defined(MOZ_WIDGET_ANDROID)
  AUTO_PROFILER_TRACING_MARKER("VR", "SubmitFrameAtVRDisplayExternal", OTHER);

  {  // scope lock
    MonitorAutoLock lock(mCurrentSubmitTaskMonitor);

    if (!SubmitFrame(aTexture, aFrameId, aLeftEyeRect, aRightEyeRect)) {
      mCurrentSubmitTask = nullptr;
      return;
    }
    mCurrentSubmitTask = nullptr;
  }

#if defined(XP_WIN) || defined(XP_MACOSX)

  /**
   * Trigger the next VSync immediately after we are successfully
   * submitting frames.  As SubmitFrame is responsible for throttling
   * the render loop, if we don't successfully call it, we shouldn't trigger
   * StartFrame immediately, as it will run unbounded.
   * If StartFrame is not called here due to SubmitFrame failing, the
   * fallback "watchdog" code in VRManager::NotifyVSync() will cause
   * frames to continue at a lower refresh rate until frame submission
   * succeeds again.
   */
  MessageLoop* loop = CompositorThreadHolder::Loop();

  loop->PostTask(NewRunnableMethod("gfx::VRManager::StartFrame", this,
                                   &VRManager::StartFrame));
#elif defined(MOZ_WIDGET_ANDROID)
  // We are already in the CompositorThreadHolder event loop on Android.
  StartFrame();
#endif
}

void VRManager::CancelCurrentSubmitTask() {
  MonitorAutoLock lock(mCurrentSubmitTaskMonitor);
  if (mCurrentSubmitTask) {
    mCurrentSubmitTask->Cancel();
    mCurrentSubmitTask = nullptr;
  }
}

//-----------------------------------------------------------------------------
// VRManager::nsIObserver
//-----------------------------------------------------------------------------

NS_IMETHODIMP
VRManager::Observe(nsISupports* subject, const char* topic,
                   const char16_t* data) {
  if (!strcmp(topic, "application-background")) {
    // StopTasks() is called later in the timer thread based on this flag to
    // avoid threading issues.
    mAppPaused = true;
  } else if (!strcmp(topic, "application-foreground") && mAppPaused) {
    mAppPaused = false;
    // When the apps goes the foreground (e.g. Android) we should restart the
    // tasks.
    StartTasks();
  }
  return NS_OK;
}

NS_IMPL_ISUPPORTS(VRManager, nsIObserver)

}  // namespace mozilla::gfx