File: gfxVROculus.cpp

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/* -*- 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/. */

#ifndef XP_WIN
#error "Oculus 1.3 runtime support only available for Windows"
#endif

#include <math.h>

#include "prlink.h"
#include "prenv.h"
#include "gfxPrefs.h"
#include "nsString.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Preferences.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/gfx/DeviceManagerDx.h"
#include "mozilla/layers/CompositorThread.h"
#include "ipc/VRLayerParent.h"

#include "mozilla/gfx/Quaternion.h"

#include <d3d11.h>
#include "CompositorD3D11.h"
#include "TextureD3D11.h"

#include "gfxVROculus.h"
#include "VRManagerParent.h"
#include "VRThread.h"

#include "mozilla/dom/GamepadEventTypes.h"
#include "mozilla/dom/GamepadBinding.h"
#include "mozilla/Telemetry.h"

/** XXX The DX11 objects and quad blitting could be encapsulated
 *    into a separate object if either Oculus starts supporting
 *     non-Windows platforms or the blit is needed by other HMD\
 *     drivers.
 *     Alternately, we could remove the extra blit for
 *     Oculus as well with some more refactoring.
 */

// See CompositorD3D11Shaders.h
namespace mozilla {
namespace layers {
struct ShaderBytes {
  const void* mData;
  size_t mLength;
};
extern ShaderBytes sRGBShader;
extern ShaderBytes sLayerQuadVS;
}  // namespace layers
}  // namespace mozilla
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::gfx::impl;
using namespace mozilla::layers;
using namespace mozilla::dom;

namespace {

static pfn_ovr_Initialize ovr_Initialize = nullptr;
static pfn_ovr_Shutdown ovr_Shutdown = nullptr;
static pfn_ovr_GetLastErrorInfo ovr_GetLastErrorInfo = nullptr;
static pfn_ovr_GetVersionString ovr_GetVersionString = nullptr;
static pfn_ovr_TraceMessage ovr_TraceMessage = nullptr;
static pfn_ovr_IdentifyClient ovr_IdentifyClient = nullptr;
static pfn_ovr_GetHmdDesc ovr_GetHmdDesc = nullptr;
static pfn_ovr_GetTrackerCount ovr_GetTrackerCount = nullptr;
static pfn_ovr_GetTrackerDesc ovr_GetTrackerDesc = nullptr;
static pfn_ovr_Create ovr_Create = nullptr;
static pfn_ovr_Destroy ovr_Destroy = nullptr;
static pfn_ovr_GetSessionStatus ovr_GetSessionStatus = nullptr;
static pfn_ovr_IsExtensionSupported ovr_IsExtensionSupported = nullptr;
static pfn_ovr_EnableExtension ovr_EnableExtension = nullptr;
static pfn_ovr_SetTrackingOriginType ovr_SetTrackingOriginType = nullptr;
static pfn_ovr_GetTrackingOriginType ovr_GetTrackingOriginType = nullptr;
static pfn_ovr_RecenterTrackingOrigin ovr_RecenterTrackingOrigin = nullptr;
static pfn_ovr_SpecifyTrackingOrigin ovr_SpecifyTrackingOrigin = nullptr;
static pfn_ovr_ClearShouldRecenterFlag ovr_ClearShouldRecenterFlag = nullptr;
static pfn_ovr_GetTrackingState ovr_GetTrackingState = nullptr;
static pfn_ovr_GetDevicePoses ovr_GetDevicePoses = nullptr;
static pfn_ovr_GetTrackerPose ovr_GetTrackerPose = nullptr;
static pfn_ovr_GetInputState ovr_GetInputState = nullptr;
static pfn_ovr_GetConnectedControllerTypes ovr_GetConnectedControllerTypes =
    nullptr;
static pfn_ovr_GetTouchHapticsDesc ovr_GetTouchHapticsDesc = nullptr;
static pfn_ovr_SetControllerVibration ovr_SetControllerVibration = nullptr;
static pfn_ovr_SubmitControllerVibration ovr_SubmitControllerVibration =
    nullptr;
static pfn_ovr_GetControllerVibrationState ovr_GetControllerVibrationState =
    nullptr;
static pfn_ovr_TestBoundary ovr_TestBoundary = nullptr;
static pfn_ovr_TestBoundaryPoint ovr_TestBoundaryPoint = nullptr;
static pfn_ovr_SetBoundaryLookAndFeel ovr_SetBoundaryLookAndFeel = nullptr;
static pfn_ovr_ResetBoundaryLookAndFeel ovr_ResetBoundaryLookAndFeel = nullptr;
static pfn_ovr_GetBoundaryGeometry ovr_GetBoundaryGeometry = nullptr;
static pfn_ovr_GetBoundaryDimensions ovr_GetBoundaryDimensions = nullptr;
static pfn_ovr_GetBoundaryVisible ovr_GetBoundaryVisible = nullptr;
static pfn_ovr_RequestBoundaryVisible ovr_RequestBoundaryVisible = nullptr;
static pfn_ovr_GetTextureSwapChainLength ovr_GetTextureSwapChainLength =
    nullptr;
static pfn_ovr_GetTextureSwapChainCurrentIndex
    ovr_GetTextureSwapChainCurrentIndex = nullptr;
static pfn_ovr_GetTextureSwapChainDesc ovr_GetTextureSwapChainDesc = nullptr;
static pfn_ovr_CommitTextureSwapChain ovr_CommitTextureSwapChain = nullptr;
static pfn_ovr_DestroyTextureSwapChain ovr_DestroyTextureSwapChain = nullptr;
static pfn_ovr_DestroyMirrorTexture ovr_DestroyMirrorTexture = nullptr;
static pfn_ovr_GetFovTextureSize ovr_GetFovTextureSize = nullptr;
static pfn_ovr_GetRenderDesc2 ovr_GetRenderDesc2 = nullptr;
static pfn_ovr_WaitToBeginFrame ovr_WaitToBeginFrame = nullptr;
static pfn_ovr_BeginFrame ovr_BeginFrame = nullptr;
static pfn_ovr_EndFrame ovr_EndFrame = nullptr;
static pfn_ovr_SubmitFrame ovr_SubmitFrame = nullptr;
static pfn_ovr_GetPerfStats ovr_GetPerfStats = nullptr;
static pfn_ovr_ResetPerfStats ovr_ResetPerfStats = nullptr;
static pfn_ovr_GetPredictedDisplayTime ovr_GetPredictedDisplayTime = nullptr;
static pfn_ovr_GetTimeInSeconds ovr_GetTimeInSeconds = nullptr;
static pfn_ovr_GetBool ovr_GetBool = nullptr;
static pfn_ovr_SetBool ovr_SetBool = nullptr;
static pfn_ovr_GetInt ovr_GetInt = nullptr;
static pfn_ovr_SetInt ovr_SetInt = nullptr;
static pfn_ovr_GetFloat ovr_GetFloat = nullptr;
static pfn_ovr_SetFloat ovr_SetFloat = nullptr;
static pfn_ovr_GetFloatArray ovr_GetFloatArray = nullptr;
static pfn_ovr_SetFloatArray ovr_SetFloatArray = nullptr;
static pfn_ovr_GetString ovr_GetString = nullptr;
static pfn_ovr_SetString ovr_SetString = nullptr;
static pfn_ovr_GetExternalCameras ovr_GetExternalCameras = nullptr;
static pfn_ovr_SetExternalCameraProperties ovr_SetExternalCameraProperties =
    nullptr;

#ifdef XP_WIN
static pfn_ovr_CreateTextureSwapChainDX ovr_CreateTextureSwapChainDX = nullptr;
static pfn_ovr_GetTextureSwapChainBufferDX ovr_GetTextureSwapChainBufferDX =
    nullptr;
static pfn_ovr_CreateMirrorTextureDX ovr_CreateMirrorTextureDX = nullptr;
static pfn_ovr_GetMirrorTextureBufferDX ovr_GetMirrorTextureBufferDX = nullptr;
#endif

static pfn_ovr_CreateTextureSwapChainGL ovr_CreateTextureSwapChainGL = nullptr;
static pfn_ovr_GetTextureSwapChainBufferGL ovr_GetTextureSwapChainBufferGL =
    nullptr;
static pfn_ovr_CreateMirrorTextureGL ovr_CreateMirrorTextureGL = nullptr;
static pfn_ovr_GetMirrorTextureBufferGL ovr_GetMirrorTextureBufferGL = nullptr;

#ifdef HAVE_64BIT_BUILD
#define BUILD_BITS 64
#else
#define BUILD_BITS 32
#endif

#define OVR_PRODUCT_VERSION 1
#define OVR_MAJOR_VERSION 1
#define OVR_MINOR_VERSION 19

enum class OculusLeftControllerButtonType : uint16_t {
  LThumb,
  IndexTrigger,
  HandTrigger,
  Button_X,
  Button_Y,
  LThumbRest,
  NumButtonType
};

enum class OculusRightControllerButtonType : uint16_t {
  RThumb,
  IndexTrigger,
  HandTrigger,
  Button_A,
  Button_B,
  RThumbRest,
  NumButtonType
};

static const uint32_t kNumOculusButton =
    static_cast<uint32_t>(OculusLeftControllerButtonType::NumButtonType);
static const uint32_t kNumOculusHaptcs = 1;

ovrFovPort ToFovPort(const VRFieldOfView& aFOV) {
  ovrFovPort fovPort;
  fovPort.LeftTan = tan(aFOV.leftDegrees * M_PI / 180.0);
  fovPort.RightTan = tan(aFOV.rightDegrees * M_PI / 180.0);
  fovPort.UpTan = tan(aFOV.upDegrees * M_PI / 180.0);
  fovPort.DownTan = tan(aFOV.downDegrees * M_PI / 180.0);
  return fovPort;
}

VRFieldOfView FromFovPort(const ovrFovPort& aFOV) {
  VRFieldOfView fovInfo;
  fovInfo.leftDegrees = atan(aFOV.LeftTan) * 180.0 / M_PI;
  fovInfo.rightDegrees = atan(aFOV.RightTan) * 180.0 / M_PI;
  fovInfo.upDegrees = atan(aFOV.UpTan) * 180.0 / M_PI;
  fovInfo.downDegrees = atan(aFOV.DownTan) * 180.0 / M_PI;
  return fovInfo;
}

}  // namespace

VROculusSession::VROculusSession()
    : mOvrLib(nullptr),
      mSession(nullptr),
      mInitFlags((ovrInitFlags)0),
      mTextureSet(nullptr),
      mRequestPresentation(false),
      mRequestTracking(false),
      mDrawBlack(false),
      mIsConnected(false),
      mIsMounted(false) {}

ovrSession VROculusSession::Get() {
  MOZ_ASSERT(mSession);
  return mSession;
}

bool VROculusSession::IsTrackingReady() const {
  // We should return true only if the HMD is connected and we
  // are ready for tracking
  MOZ_ASSERT(!mIsConnected || mSession);
  return mIsConnected;
}

bool VROculusSession::IsPresentationReady() const {
  return !mRenderTargets.IsEmpty();
}

bool VROculusSession::IsMounted() const { return mIsMounted; }

void VROculusSession::StopTracking() {
  if (mRequestTracking) {
    mRequestTracking = false;
    Refresh();
  }
}

void VROculusSession::StartTracking() {
  if (!mRequestTracking) {
    mRequestTracking = true;
    Refresh();
  }
}

void VROculusSession::StartPresentation(const IntSize& aSize) {
  if (!mRequestPresentation) {
    mRequestPresentation = true;
    mTelemetry.Clear();
    mTelemetry.mPresentationStart = TimeStamp::Now();

    ovrPerfStats perfStats;
    if (ovr_GetPerfStats(mSession, &perfStats) == ovrSuccess) {
      if (perfStats.FrameStatsCount) {
        mTelemetry.mLastDroppedFrameCount =
            perfStats.FrameStats[0].AppDroppedFrameCount;
      }
    }
  }

  // Update the size, even when we are already presenting.
  mPresentationSize = aSize;
  Refresh();
}

void VROculusSession::StopPresentation() {
  if (mRequestPresentation) {
    mLastPresentationEnd = TimeStamp::Now();
    mRequestPresentation = false;

    const TimeDuration duration =
        mLastPresentationEnd - mTelemetry.mPresentationStart;
    Telemetry::Accumulate(Telemetry::WEBVR_USERS_VIEW_IN, 1);
    Telemetry::Accumulate(Telemetry::WEBVR_TIME_SPENT_VIEWING_IN_OCULUS,
                          duration.ToMilliseconds());

    if (mTelemetry.IsLastDroppedFrameValid() && duration.ToSeconds()) {
      ovrPerfStats perfStats;
      if (ovr_GetPerfStats(mSession, &perfStats) == ovrSuccess) {
        if (perfStats.FrameStatsCount) {
          const uint32_t droppedFramesPerSec =
              (perfStats.FrameStats[0].AppDroppedFrameCount -
               mTelemetry.mLastDroppedFrameCount) /
              duration.ToSeconds();
          Telemetry::Accumulate(Telemetry::WEBVR_DROPPED_FRAMES_IN_OCULUS,
                                droppedFramesPerSec);
        }
      }
    }
    Refresh();
  }
}

VROculusSession::~VROculusSession() {
  mSubmitThread = nullptr;
  Uninitialize();
}

void VROculusSession::Uninitialize() {
  StopRendering();
  StopSession();
  StopLib();
  UnloadOvrLib();
}

void VROculusSession::StopRendering() {
  if (!mRenderTargets.IsEmpty()) {
    mRenderTargets.Clear();
  }
  if (mTextureSet && mSession) {
    ovr_DestroyTextureSwapChain(mSession, mTextureSet);
  }
  mTextureSet = nullptr;
  mDevice = nullptr;
}

void VROculusSession::StopSession() {
  if (mSession) {
    ovr_Destroy(mSession);
    mIsConnected = false;
    mIsMounted = false;
    mSession = nullptr;
  }
}

void VROculusSession::StopLib() {
  if (mInitFlags) {
    ovr_Shutdown();
    mInitFlags = (ovrInitFlags)0;
  }
}

void VROculusSession::Refresh(bool aForceRefresh) {
  // We are waiting for drawing the black layer command for
  // Compositor thread. Ignore Refresh() calls from other threads.
  if (mDrawBlack && !aForceRefresh) {
    return;
  }

  if (!mRequestTracking) {
    Uninitialize();
    return;
  }

  ovrInitFlags flags =
      (ovrInitFlags)(ovrInit_RequestVersion | ovrInit_MixedRendering);
  bool bInvisible = true;
  if (!gfxPrefs::VROculusInvisibleEnabled()) {
    bInvisible = false;
  }
  if (mRequestPresentation) {
    bInvisible = false;
  } else if (!mLastPresentationEnd.IsNull()) {
    TimeDuration duration = TimeStamp::Now() - mLastPresentationEnd;
    TimeDuration timeout =
        TimeDuration::FromMilliseconds(gfxPrefs::VROculusPresentTimeout());
    if (timeout > TimeDuration(0) && duration < timeout) {
      // Do not immediately re-initialize with an invisible session after
      // the end of a VR presentation.  Waiting for the configured duraction
      // ensures that the user will not drop to Oculus Home during VR link
      // traversal.
      bInvisible = false;

      // While we are waiting for either the timeout or a new presentation,
      // fill the HMD with black / no layers.
      if (mSession && mTextureSet) {
        if (!aForceRefresh) {
          // VROculusSession didn't start submitting frames yet.
          // Or, the VR thread has been shut down already.
          if (!mSubmitThread || !mSubmitThread->IsActive()) {
            return;
          }
          // ovr_SubmitFrame is running at VR Submit thread,
          // so we post this task to VR Submit thread and let it paint
          // a black frame.
          mDrawBlack = true;
          mSubmitThread->PostTask(
              NewRunnableMethod<bool>("gfx::VROculusSession::Refresh", this,
                                      &VROculusSession::Refresh, true));
          return;
        }
        ovrLayerEyeFov layer;
        memset(&layer, 0, sizeof(layer));
        layer.Header.Type = ovrLayerType_Disabled;
        ovrLayerHeader* layers = &layer.Header;
        ovr_SubmitFrame(mSession, 0, nullptr, &layers, 1);
        mDrawBlack = false;
      }
    }
  }
  if (bInvisible) {
    flags = (ovrInitFlags)(flags | ovrInit_Invisible);
  }

  if (mInitFlags != flags) {
    Uninitialize();
  }

  if (!Initialize(flags)) {
    // If we fail to initialize, ensure the Oculus libraries
    // are unloaded, as we can't poll for ovrSessionStatus::ShouldQuit
    // without an active ovrSession.
    Uninitialize();
  }

  if (mSession) {
    ovrSessionStatus status;
    if (OVR_SUCCESS(ovr_GetSessionStatus(mSession, &status))) {
      mIsConnected = status.HmdPresent;
      mIsMounted = status.HmdMounted;
      if (status.ShouldQuit) {
        mLastShouldQuit = TimeStamp::Now();
        Uninitialize();
      }
    } else {
      mIsConnected = false;
      mIsMounted = false;
    }
  }
}

bool VROculusSession::IsQuitTimeoutActive() {
  // If Oculus asked us to quit our session, do not try to initialize again
  // immediately.
  if (!mLastShouldQuit.IsNull()) {
    TimeDuration duration = TimeStamp::Now() - mLastShouldQuit;
    TimeDuration timeout =
        TimeDuration::FromMilliseconds(gfxPrefs::VROculusQuitTimeout());
    if (timeout > TimeDuration(0) && duration < timeout) {
      return true;
    }
  }
  return false;
}

bool VROculusSession::Initialize(ovrInitFlags aFlags) {
  if (IsQuitTimeoutActive()) {
    return false;
  }

  if (!LoadOvrLib()) {
    return false;
  }
  if (!StartLib(aFlags)) {
    return false;
  }
  if (!StartSession()) {
    return false;
  }
  if (!StartRendering()) {
    return false;
  }
  return true;
}

bool VROculusSession::StartRendering() {
  if (!mRequestPresentation) {
    // Nothing to do if we aren't presenting
    return true;
  }
  if (!mDevice) {
    mDevice = gfx::DeviceManagerDx::Get()->GetVRDevice();
    if (!mDevice) {
      NS_WARNING("Failed to get a D3D11Device for Oculus");
      return false;
    }
  }

  if (!mTextureSet) {
    /**
     * The presentation format is determined by content, which describes the
     * left and right eye rectangles in the VRLayer.  The default, if no
     * coordinates are passed is to place the left and right eye textures
     * side-by-side within the buffer.
     *
     * XXX - An optimization would be to dynamically resize this buffer
     *       to accomodate sites that are choosing to render in a lower
     *       resolution or are using space outside of the left and right
     *       eye textures for other purposes.  (Bug 1291443)
     */

    ovrTextureSwapChainDesc desc;
    memset(&desc, 0, sizeof(desc));
    desc.Type = ovrTexture_2D;
    desc.ArraySize = 1;
    desc.Format = OVR_FORMAT_B8G8R8A8_UNORM_SRGB;
    desc.Width = mPresentationSize.width;
    desc.Height = mPresentationSize.height;
    desc.MipLevels = 1;
    desc.SampleCount = 1;
    desc.StaticImage = false;
    desc.MiscFlags = ovrTextureMisc_DX_Typeless;
    desc.BindFlags = ovrTextureBind_DX_RenderTarget;

    ovrResult orv =
        ovr_CreateTextureSwapChainDX(mSession, mDevice, &desc, &mTextureSet);
    if (orv != ovrSuccess) {
      NS_WARNING("ovr_CreateTextureSwapChainDX failed");
      return false;
    }
  }

  if (mTextureSet && mRenderTargets.IsEmpty()) {
    int textureCount = 0;
    ovrResult orv =
        ovr_GetTextureSwapChainLength(mSession, mTextureSet, &textureCount);
    if (orv != ovrSuccess) {
      NS_WARNING("ovr_GetTextureSwapChainLength failed");
      return false;
    }
    mRenderTargets.SetLength(textureCount);
    for (int i = 0; i < textureCount; ++i) {
      RefPtr<CompositingRenderTargetD3D11> rt;
      ID3D11Texture2D* texture = nullptr;
      orv = ovr_GetTextureSwapChainBufferDX(mSession, mTextureSet, i,
                                            IID_PPV_ARGS(&texture));
      MOZ_ASSERT(orv == ovrSuccess, "ovr_GetTextureSwapChainBufferDX failed.");
      rt = new CompositingRenderTargetD3D11(texture, IntPoint(0, 0),
                                            DXGI_FORMAT_B8G8R8A8_UNORM);
      rt->SetSize(mPresentationSize);
      mRenderTargets[i] = rt;
      texture->Release();
    }
  }
  return true;
}

bool VROculusSession::StartLib(ovrInitFlags aFlags) {
  if (mInitFlags == 0) {
    ovrInitParams params;
    memset(&params, 0, sizeof(params));
    params.Flags = aFlags;
    params.RequestedMinorVersion = OVR_MINOR_VERSION;
    params.LogCallback = nullptr;
    params.ConnectionTimeoutMS = 0;

    ovrResult orv = ovr_Initialize(&params);

    if (orv == ovrSuccess) {
      mInitFlags = aFlags;
    } else {
      return false;
    }
  }
  MOZ_ASSERT(mInitFlags == aFlags);
  return true;
}

bool VROculusSession::StartSession() {
  // ovr_Create can be slow when no HMD is present and we wish
  // to keep the same oculus session when possible, so we detect
  // presence of an HMD with ovr_GetHmdDesc before calling ovr_Create
  ovrHmdDesc desc = ovr_GetHmdDesc(NULL);
  if (desc.Type == ovrHmd_None) {
    // No HMD connected, destroy any existing session
    if (mSession) {
      ovr_Destroy(mSession);
      mSession = nullptr;
    }
    return false;
  }
  if (mSession != nullptr) {
    // HMD Detected and we already have a session, let's keep using it.
    return true;
  }

  // HMD Detected and we don't have a session yet,
  // try to create a new session
  ovrSession session;
  ovrGraphicsLuid luid;
  ovrResult orv = ovr_Create(&session, &luid);
  if (orv == ovrSuccess) {
    orv = ovr_SetTrackingOriginType(session, ovrTrackingOrigin_FloorLevel);
    if (orv != ovrSuccess) {
      NS_WARNING("ovr_SetTrackingOriginType failed.\n");
    }
    mSession = session;
    return true;
  }

  // Failed to create a session for the HMD
  return false;
}

bool VROculusSession::LoadOvrLib() {
  if (mOvrLib) {
    // Already loaded, early exit
    return true;
  }
  nsTArray<nsCString> libSearchPaths;
  nsCString libName;
  nsCString searchPath;

#if defined(_WIN32)
  static const char dirSep = '\\';
  static const int pathLen = 260;
  searchPath.SetCapacity(pathLen);
  int realLen = ::GetSystemDirectoryA(searchPath.BeginWriting(), pathLen);
  if (realLen != 0 && realLen < pathLen) {
    searchPath.SetLength(realLen);
    libSearchPaths.AppendElement(searchPath);
  }
  libName.AppendPrintf("LibOVRRT%d_%d.dll", BUILD_BITS, OVR_PRODUCT_VERSION);
#else
#error "Unsupported platform!"
#endif

  // search the path/module dir
  libSearchPaths.InsertElementsAt(0, 1, nsCString());

  // If the env var is present, we override libName
  if (PR_GetEnv("OVR_LIB_PATH")) {
    searchPath = PR_GetEnv("OVR_LIB_PATH");
    libSearchPaths.InsertElementsAt(0, 1, searchPath);
  }

  if (PR_GetEnv("OVR_LIB_NAME")) {
    libName = PR_GetEnv("OVR_LIB_NAME");
  }

  for (uint32_t i = 0; i < libSearchPaths.Length(); ++i) {
    nsCString& libPath = libSearchPaths[i];
    nsCString fullName;
    if (libPath.Length() == 0) {
      fullName.Assign(libName);
    } else {
      fullName.AppendPrintf("%s%c%s", libPath.BeginReading(), dirSep,
                            libName.BeginReading());
    }

    mOvrLib = PR_LoadLibrary(fullName.BeginReading());
    if (mOvrLib) {
      break;
    }
  }

  if (!mOvrLib) {
    return false;
  }

#define REQUIRE_FUNCTION(_x)                           \
  do {                                                 \
    *(void**)&_x = (void*)PR_FindSymbol(mOvrLib, #_x); \
    if (!_x) {                                         \
      printf_stderr(#_x " symbol missing\n");          \
      goto fail;                                       \
    }                                                  \
  } while (0)

  REQUIRE_FUNCTION(ovr_Initialize);
  REQUIRE_FUNCTION(ovr_Shutdown);
  REQUIRE_FUNCTION(ovr_GetLastErrorInfo);
  REQUIRE_FUNCTION(ovr_GetVersionString);
  REQUIRE_FUNCTION(ovr_TraceMessage);
  REQUIRE_FUNCTION(ovr_IdentifyClient);
  REQUIRE_FUNCTION(ovr_GetHmdDesc);
  REQUIRE_FUNCTION(ovr_GetTrackerCount);
  REQUIRE_FUNCTION(ovr_GetTrackerDesc);
  REQUIRE_FUNCTION(ovr_Create);
  REQUIRE_FUNCTION(ovr_Destroy);
  REQUIRE_FUNCTION(ovr_GetSessionStatus);
  REQUIRE_FUNCTION(ovr_IsExtensionSupported);
  REQUIRE_FUNCTION(ovr_EnableExtension);
  REQUIRE_FUNCTION(ovr_SetTrackingOriginType);
  REQUIRE_FUNCTION(ovr_GetTrackingOriginType);
  REQUIRE_FUNCTION(ovr_RecenterTrackingOrigin);
  REQUIRE_FUNCTION(ovr_SpecifyTrackingOrigin);
  REQUIRE_FUNCTION(ovr_ClearShouldRecenterFlag);
  REQUIRE_FUNCTION(ovr_GetTrackingState);
  REQUIRE_FUNCTION(ovr_GetDevicePoses);
  REQUIRE_FUNCTION(ovr_GetTrackerPose);
  REQUIRE_FUNCTION(ovr_GetInputState);
  REQUIRE_FUNCTION(ovr_GetConnectedControllerTypes);
  REQUIRE_FUNCTION(ovr_GetTouchHapticsDesc);
  REQUIRE_FUNCTION(ovr_SetControllerVibration);
  REQUIRE_FUNCTION(ovr_SubmitControllerVibration);
  REQUIRE_FUNCTION(ovr_GetControllerVibrationState);
  REQUIRE_FUNCTION(ovr_TestBoundary);
  REQUIRE_FUNCTION(ovr_TestBoundaryPoint);
  REQUIRE_FUNCTION(ovr_SetBoundaryLookAndFeel);
  REQUIRE_FUNCTION(ovr_ResetBoundaryLookAndFeel);
  REQUIRE_FUNCTION(ovr_GetBoundaryGeometry);
  REQUIRE_FUNCTION(ovr_GetBoundaryDimensions);
  REQUIRE_FUNCTION(ovr_GetBoundaryVisible);
  REQUIRE_FUNCTION(ovr_RequestBoundaryVisible);
  REQUIRE_FUNCTION(ovr_GetTextureSwapChainLength);
  REQUIRE_FUNCTION(ovr_GetTextureSwapChainCurrentIndex);
  REQUIRE_FUNCTION(ovr_GetTextureSwapChainDesc);
  REQUIRE_FUNCTION(ovr_CommitTextureSwapChain);
  REQUIRE_FUNCTION(ovr_DestroyTextureSwapChain);
  REQUIRE_FUNCTION(ovr_DestroyMirrorTexture);
  REQUIRE_FUNCTION(ovr_GetFovTextureSize);
  REQUIRE_FUNCTION(ovr_GetRenderDesc2);
  REQUIRE_FUNCTION(ovr_WaitToBeginFrame);
  REQUIRE_FUNCTION(ovr_BeginFrame);
  REQUIRE_FUNCTION(ovr_EndFrame);
  REQUIRE_FUNCTION(ovr_SubmitFrame);
  REQUIRE_FUNCTION(ovr_GetPerfStats);
  REQUIRE_FUNCTION(ovr_ResetPerfStats);
  REQUIRE_FUNCTION(ovr_GetPredictedDisplayTime);
  REQUIRE_FUNCTION(ovr_GetTimeInSeconds);
  REQUIRE_FUNCTION(ovr_GetBool);
  REQUIRE_FUNCTION(ovr_SetBool);
  REQUIRE_FUNCTION(ovr_GetInt);
  REQUIRE_FUNCTION(ovr_SetInt);
  REQUIRE_FUNCTION(ovr_GetFloat);
  REQUIRE_FUNCTION(ovr_SetFloat);
  REQUIRE_FUNCTION(ovr_GetFloatArray);
  REQUIRE_FUNCTION(ovr_SetFloatArray);
  REQUIRE_FUNCTION(ovr_GetString);
  REQUIRE_FUNCTION(ovr_SetString);
  REQUIRE_FUNCTION(ovr_GetExternalCameras);
  REQUIRE_FUNCTION(ovr_SetExternalCameraProperties);

#ifdef XP_WIN

  REQUIRE_FUNCTION(ovr_CreateTextureSwapChainDX);
  REQUIRE_FUNCTION(ovr_GetTextureSwapChainBufferDX);
  REQUIRE_FUNCTION(ovr_CreateMirrorTextureDX);
  REQUIRE_FUNCTION(ovr_GetMirrorTextureBufferDX);

#endif

  REQUIRE_FUNCTION(ovr_CreateTextureSwapChainGL);
  REQUIRE_FUNCTION(ovr_GetTextureSwapChainBufferGL);
  REQUIRE_FUNCTION(ovr_CreateMirrorTextureGL);
  REQUIRE_FUNCTION(ovr_GetMirrorTextureBufferGL);

#undef REQUIRE_FUNCTION

  return true;

fail:
  ovr_Initialize = nullptr;
  PR_UnloadLibrary(mOvrLib);
  mOvrLib = nullptr;
  return false;
}

already_AddRefed<CompositingRenderTargetD3D11>
VROculusSession::GetNextRenderTarget() {
  int currentRenderTarget = 0;
  DebugOnly<ovrResult> orv = ovr_GetTextureSwapChainCurrentIndex(
      mSession, mTextureSet, &currentRenderTarget);
  MOZ_ASSERT(orv == ovrSuccess, "ovr_GetTextureSwapChainCurrentIndex failed.");

  mRenderTargets[currentRenderTarget]->ClearOnBind();
  RefPtr<CompositingRenderTargetD3D11> rt = mRenderTargets[currentRenderTarget];
  return rt.forget();
}

ovrTextureSwapChain VROculusSession::GetSwapChain() {
  MOZ_ASSERT(mTextureSet);
  return mTextureSet;
}

void VROculusSession::UnloadOvrLib() {
  if (mOvrLib) {
    PR_UnloadLibrary(mOvrLib);
    mOvrLib = nullptr;
  }
}

VRDisplayOculus::VRDisplayOculus(VROculusSession* aSession)
    : VRDisplayHost(VRDeviceType::Oculus),
      mSession(aSession),
      mQuadVS(nullptr),
      mQuadPS(nullptr),
      mLinearSamplerState(nullptr),
      mVSConstantBuffer(nullptr),
      mPSConstantBuffer(nullptr),
      mVertexBuffer(nullptr),
      mInputLayout(nullptr),
      mEyeHeight(OVR_DEFAULT_EYE_HEIGHT) {
  MOZ_COUNT_CTOR_INHERITED(VRDisplayOculus, VRDisplayHost);

  mDisplayInfo.mDisplayName.AssignLiteral("Oculus VR HMD");
  mDisplayInfo.mIsConnected = true;
  mDisplayInfo.mIsMounted = false;

  mDesc = ovr_GetHmdDesc(aSession->Get());

  mDisplayInfo.mCapabilityFlags = VRDisplayCapabilityFlags::Cap_None;
  if (mDesc.AvailableTrackingCaps & ovrTrackingCap_Orientation) {
    mDisplayInfo.mCapabilityFlags |= VRDisplayCapabilityFlags::Cap_Orientation;
    mDisplayInfo.mCapabilityFlags |=
        VRDisplayCapabilityFlags::Cap_AngularAcceleration;
  }
  if (mDesc.AvailableTrackingCaps & ovrTrackingCap_Position) {
    mDisplayInfo.mCapabilityFlags |= VRDisplayCapabilityFlags::Cap_Position;
    mDisplayInfo.mCapabilityFlags |=
        VRDisplayCapabilityFlags::Cap_LinearAcceleration;
    mDisplayInfo.mCapabilityFlags |=
        VRDisplayCapabilityFlags::Cap_StageParameters;
  }
  mDisplayInfo.mCapabilityFlags |= VRDisplayCapabilityFlags::Cap_External;
  mDisplayInfo.mCapabilityFlags |= VRDisplayCapabilityFlags::Cap_MountDetection;
  mDisplayInfo.mCapabilityFlags |= VRDisplayCapabilityFlags::Cap_Present;

  mFOVPort[VRDisplayInfo::Eye_Left] = mDesc.DefaultEyeFov[ovrEye_Left];
  mFOVPort[VRDisplayInfo::Eye_Right] = mDesc.DefaultEyeFov[ovrEye_Right];

  mDisplayInfo.mEyeFOV[VRDisplayInfo::Eye_Left] =
      FromFovPort(mFOVPort[VRDisplayInfo::Eye_Left]);
  mDisplayInfo.mEyeFOV[VRDisplayInfo::Eye_Right] =
      FromFovPort(mFOVPort[VRDisplayInfo::Eye_Right]);

  float pixelsPerDisplayPixel = 1.0;
  ovrSizei texSize[2];

  // get eye texture sizes
  for (uint32_t eye = 0; eye < VRDisplayInfo::NumEyes; eye++) {
    texSize[eye] = ovr_GetFovTextureSize(mSession->Get(), (ovrEyeType)eye,
                                         mFOVPort[eye], pixelsPerDisplayPixel);
  }

  // take the max of both for eye resolution
  mDisplayInfo.mEyeResolution.width = std::max(
      texSize[VRDisplayInfo::Eye_Left].w, texSize[VRDisplayInfo::Eye_Right].w);
  mDisplayInfo.mEyeResolution.height = std::max(
      texSize[VRDisplayInfo::Eye_Left].h, texSize[VRDisplayInfo::Eye_Right].h);

  UpdateEyeParameters();
  UpdateStageParameters();
}

VRDisplayOculus::~VRDisplayOculus() {
  Destroy();
  MOZ_COUNT_DTOR_INHERITED(VRDisplayOculus, VRDisplayHost);
}

void VRDisplayOculus::Destroy() {
  StopPresentation();
  mSession = nullptr;
}

void VRDisplayOculus::UpdateEyeParameters(
    gfx::Matrix4x4* aHeadToEyeTransforms /* = nullptr */) {
  // Note this must be called every frame, as the IPD adjustment can be changed
  // by the user during a VR session.
  for (uint32_t eye = 0; eye < VRDisplayInfo::NumEyes; eye++) {
    // As of Oculus 1.17 SDK, we must use the ovr_GetRenderDesc2 function to
    // return the updated version of ovrEyeRenderDesc.  This is normally done by
    // the Oculus static lib shim, but we need to do this explicitly as we are
    // loading the Oculus runtime dll directly.
    ovrEyeRenderDesc renderDesc =
        ovr_GetRenderDesc2(mSession->Get(), (ovrEyeType)eye, mFOVPort[eye]);
    mDisplayInfo.mEyeTranslation[eye].x = renderDesc.HmdToEyePose.Position.x;
    mDisplayInfo.mEyeTranslation[eye].y = renderDesc.HmdToEyePose.Position.y;
    mDisplayInfo.mEyeTranslation[eye].z = renderDesc.HmdToEyePose.Position.z;
    if (aHeadToEyeTransforms) {
      Matrix4x4 pose;
      pose.SetRotationFromQuaternion(
          gfx::Quaternion(renderDesc.HmdToEyePose.Orientation.x,
                          renderDesc.HmdToEyePose.Orientation.y,
                          renderDesc.HmdToEyePose.Orientation.z,
                          renderDesc.HmdToEyePose.Orientation.w));
      pose.PreTranslate(renderDesc.HmdToEyePose.Position.x,
                        renderDesc.HmdToEyePose.Position.y,
                        renderDesc.HmdToEyePose.Position.z);
      pose.Invert();
      aHeadToEyeTransforms[eye] = pose;
    }
  }
}

void VRDisplayOculus::UpdateStageParameters() {
  if (!mSession->IsTrackingReady()) {
    return;
  }
  ovrVector3f playArea;
  ovrResult res = ovr_GetBoundaryDimensions(mSession->Get(),
                                            ovrBoundary_PlayArea, &playArea);
  if (res == ovrSuccess) {
    mDisplayInfo.mStageSize.width = playArea.x;
    mDisplayInfo.mStageSize.height = playArea.z;
  } else {
    // If we fail, fall back to reasonable defaults.
    // 1m x 1m space
    mDisplayInfo.mStageSize.width = 1.0f;
    mDisplayInfo.mStageSize.height = 1.0f;
  }

  mEyeHeight =
      ovr_GetFloat(mSession->Get(), OVR_KEY_EYE_HEIGHT, OVR_DEFAULT_EYE_HEIGHT);

  mDisplayInfo.mSittingToStandingTransform._11 = 1.0f;
  mDisplayInfo.mSittingToStandingTransform._12 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._13 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._14 = 0.0f;

  mDisplayInfo.mSittingToStandingTransform._21 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._22 = 1.0f;
  mDisplayInfo.mSittingToStandingTransform._23 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._24 = 0.0f;

  mDisplayInfo.mSittingToStandingTransform._31 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._32 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._33 = 1.0f;
  mDisplayInfo.mSittingToStandingTransform._34 = 0.0f;

  mDisplayInfo.mSittingToStandingTransform._41 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._42 = mEyeHeight;
  mDisplayInfo.mSittingToStandingTransform._43 = 0.0f;
  mDisplayInfo.mSittingToStandingTransform._44 = 1.0f;
}

void VRDisplayOculus::ZeroSensor() {
  if (!mSession->IsTrackingReady()) {
    return;
  }
  ovr_RecenterTrackingOrigin(mSession->Get());
  UpdateStageParameters();
}

VRHMDSensorState VRDisplayOculus::GetSensorState() {
  VRHMDSensorState result{};
  if (mSession->IsTrackingReady()) {
    gfx::Matrix4x4 headToEyeTransforms[2];
    UpdateEyeParameters(headToEyeTransforms);
    double predictedFrameTime = 0.0f;
    if (gfxPrefs::VRPosePredictionEnabled()) {
      // XXX We might need to call ovr_GetPredictedDisplayTime even if we don't
      // use the result. If we don't call it, the Oculus driver will spew out
      // many warnings...
      predictedFrameTime = ovr_GetPredictedDisplayTime(mSession->Get(), 0);
    }
    result = GetSensorState(predictedFrameTime);
    result.position[1] -= mEyeHeight;
    result.CalcViewMatrices(headToEyeTransforms);
  }
  result.inputFrameID = mDisplayInfo.mFrameId;

  return result;
}

VRHMDSensorState VRDisplayOculus::GetSensorState(double absTime) {
  VRHMDSensorState result{};

  ovrTrackingState state = ovr_GetTrackingState(mSession->Get(), absTime, true);
  ovrPoseStatef& pose(state.HeadPose);

  result.timestamp = pose.TimeInSeconds;

  if (state.StatusFlags & ovrStatus_OrientationTracked) {
    result.flags |= VRDisplayCapabilityFlags::Cap_Orientation;

    result.orientation[0] = pose.ThePose.Orientation.x;
    result.orientation[1] = pose.ThePose.Orientation.y;
    result.orientation[2] = pose.ThePose.Orientation.z;
    result.orientation[3] = pose.ThePose.Orientation.w;

    result.angularVelocity[0] = pose.AngularVelocity.x;
    result.angularVelocity[1] = pose.AngularVelocity.y;
    result.angularVelocity[2] = pose.AngularVelocity.z;

    result.flags |= VRDisplayCapabilityFlags::Cap_AngularAcceleration;

    result.angularAcceleration[0] = pose.AngularAcceleration.x;
    result.angularAcceleration[1] = pose.AngularAcceleration.y;
    result.angularAcceleration[2] = pose.AngularAcceleration.z;
  } else {
    // default to an identity quaternion
    result.orientation[3] = 1.0f;
  }

  if (state.StatusFlags & ovrStatus_PositionTracked) {
    result.flags |= VRDisplayCapabilityFlags::Cap_Position;

    result.position[0] = pose.ThePose.Position.x;
    result.position[1] = pose.ThePose.Position.y;
    result.position[2] = pose.ThePose.Position.z;

    result.linearVelocity[0] = pose.LinearVelocity.x;
    result.linearVelocity[1] = pose.LinearVelocity.y;
    result.linearVelocity[2] = pose.LinearVelocity.z;

    result.flags |= VRDisplayCapabilityFlags::Cap_LinearAcceleration;

    result.linearAcceleration[0] = pose.LinearAcceleration.x;
    result.linearAcceleration[1] = pose.LinearAcceleration.y;
    result.linearAcceleration[2] = pose.LinearAcceleration.z;
  }
  result.flags |= VRDisplayCapabilityFlags::Cap_External;
  result.flags |= VRDisplayCapabilityFlags::Cap_MountDetection;
  result.flags |= VRDisplayCapabilityFlags::Cap_Present;

  return result;
}

void VRDisplayOculus::StartPresentation() {
  if (!CreateD3DObjects()) {
    return;
  }
  mSession->StartPresentation(IntSize(mDisplayInfo.mEyeResolution.width * 2,
                                      mDisplayInfo.mEyeResolution.height));
  if (!mSession->IsPresentationReady()) {
    return;
  }

  if (!mQuadVS) {
    if (FAILED(mDevice->CreateVertexShader(
            sLayerQuadVS.mData, sLayerQuadVS.mLength, nullptr, &mQuadVS))) {
      NS_WARNING("Failed to create vertex shader for Oculus");
      return;
    }
  }

  if (!mQuadPS) {
    if (FAILED(mDevice->CreatePixelShader(sRGBShader.mData, sRGBShader.mLength,
                                          nullptr, &mQuadPS))) {
      NS_WARNING("Failed to create pixel shader for Oculus");
      return;
    }
  }

  CD3D11_BUFFER_DESC cBufferDesc(sizeof(layers::VertexShaderConstants),
                                 D3D11_BIND_CONSTANT_BUFFER,
                                 D3D11_USAGE_DYNAMIC, D3D11_CPU_ACCESS_WRITE);

  if (!mVSConstantBuffer) {
    if (FAILED(mDevice->CreateBuffer(&cBufferDesc, nullptr,
                                     getter_AddRefs(mVSConstantBuffer)))) {
      NS_WARNING("Failed to vertex shader constant buffer for Oculus");
      return;
    }
  }

  if (!mPSConstantBuffer) {
    cBufferDesc.ByteWidth = sizeof(layers::PixelShaderConstants);
    if (FAILED(mDevice->CreateBuffer(&cBufferDesc, nullptr,
                                     getter_AddRefs(mPSConstantBuffer)))) {
      NS_WARNING("Failed to pixel shader constant buffer for Oculus");
      return;
    }
  }

  if (!mLinearSamplerState) {
    CD3D11_SAMPLER_DESC samplerDesc(D3D11_DEFAULT);
    if (FAILED(mDevice->CreateSamplerState(
            &samplerDesc, getter_AddRefs(mLinearSamplerState)))) {
      NS_WARNING("Failed to create sampler state for Oculus");
      return;
    }
  }

  if (!mInputLayout) {
    D3D11_INPUT_ELEMENT_DESC layout[] = {
        {"POSITION", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 0,
         D3D11_INPUT_PER_VERTEX_DATA, 0},
    };

    if (FAILED(mDevice->CreateInputLayout(
            layout, sizeof(layout) / sizeof(D3D11_INPUT_ELEMENT_DESC),
            sLayerQuadVS.mData, sLayerQuadVS.mLength,
            getter_AddRefs(mInputLayout)))) {
      NS_WARNING("Failed to create input layout for Oculus");
      return;
    }
  }

  if (!mVertexBuffer) {
    Vertex vertices[] = {
        {{0.0, 0.0}}, {{1.0, 0.0}}, {{0.0, 1.0}}, {{1.0, 1.0}}};
    CD3D11_BUFFER_DESC bufferDesc(sizeof(vertices), D3D11_BIND_VERTEX_BUFFER);
    D3D11_SUBRESOURCE_DATA data;
    data.pSysMem = (void*)vertices;

    if (FAILED(mDevice->CreateBuffer(&bufferDesc, &data,
                                     getter_AddRefs(mVertexBuffer)))) {
      NS_WARNING("Failed to create vertex buffer for Oculus");
      return;
    }
  }

  memset(&mVSConstants, 0, sizeof(mVSConstants));
  memset(&mPSConstants, 0, sizeof(mPSConstants));
}

void VRDisplayOculus::StopPresentation() {
  if (mSession) {
    mSession->StopPresentation();
  }
}

bool VRDisplayOculus::UpdateConstantBuffers() {
  HRESULT hr;
  D3D11_MAPPED_SUBRESOURCE resource;
  resource.pData = nullptr;

  hr = mContext->Map(mVSConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0,
                     &resource);
  if (FAILED(hr) || !resource.pData) {
    return false;
  }
  *(VertexShaderConstants*)resource.pData = mVSConstants;
  mContext->Unmap(mVSConstantBuffer, 0);
  resource.pData = nullptr;

  hr = mContext->Map(mPSConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0,
                     &resource);
  if (FAILED(hr) || !resource.pData) {
    return false;
  }
  *(PixelShaderConstants*)resource.pData = mPSConstants;
  mContext->Unmap(mPSConstantBuffer, 0);

  ID3D11Buffer* buffer = mVSConstantBuffer;
  mContext->VSSetConstantBuffers(0, 1, &buffer);
  buffer = mPSConstantBuffer;
  mContext->PSSetConstantBuffers(0, 1, &buffer);
  return true;
}

bool VRDisplayOculus::SubmitFrame(ID3D11Texture2D* aSource,
                                  const IntSize& aSize,
                                  const gfx::Rect& aLeftEyeRect,
                                  const gfx::Rect& aRightEyeRect) {
  MOZ_ASSERT(mSubmitThread->GetThread() == NS_GetCurrentThread());
  if (!CreateD3DObjects()) {
    return false;
  }

  AutoRestoreRenderState restoreState(this);
  if (!restoreState.IsSuccess()) {
    return false;
  }

  if (!mSession->IsPresentationReady()) {
    return false;
  }
  /**
   * XXX - We should resolve fail the promise returned by
   *       VRDisplay.requestPresent() when the DX11 resources fail allocation
   *       in VRDisplayOculus::StartPresentation().
   *       Bailing out here prevents the crash but content should be aware
   *       that frames are not being presented.
   *       See Bug 1299309.
   **/

  RefPtr<CompositingRenderTargetD3D11> surface =
      mSession->GetNextRenderTarget();

  surface->BindRenderTarget(mContext);

  Matrix viewMatrix = Matrix::Translation(-1.0, 1.0);
  viewMatrix.PreScale(2.0f / float(aSize.width), 2.0f / float(aSize.height));
  viewMatrix.PreScale(1.0f, -1.0f);
  Matrix4x4 projection = Matrix4x4::From2D(viewMatrix);
  projection._33 = 0.0f;

  Matrix transform2d;
  gfx::Matrix4x4 transform = gfx::Matrix4x4::From2D(transform2d);

  D3D11_VIEWPORT viewport;
  viewport.MinDepth = 0.0f;
  viewport.MaxDepth = 1.0f;
  viewport.Width = aSize.width;
  viewport.Height = aSize.height;
  viewport.TopLeftX = 0;
  viewport.TopLeftY = 0;

  D3D11_RECT scissor;
  scissor.left = 0;
  scissor.right = aSize.width;
  scissor.top = 0;
  scissor.bottom = aSize.height;

  memcpy(&mVSConstants.layerTransform, &transform._11,
         sizeof(mVSConstants.layerTransform));
  memcpy(&mVSConstants.projection, &projection._11,
         sizeof(mVSConstants.projection));
  mVSConstants.renderTargetOffset[0] = 0.0f;
  mVSConstants.renderTargetOffset[1] = 0.0f;
  mVSConstants.layerQuad = Rect(0.0f, 0.0f, aSize.width, aSize.height);
  mVSConstants.textureCoords = Rect(0.0f, 1.0f, 1.0f, -1.0f);

  mPSConstants.layerOpacity[0] = 1.0f;

  ID3D11Buffer* vbuffer = mVertexBuffer;
  UINT vsize = sizeof(Vertex);
  UINT voffset = 0;
  mContext->IASetVertexBuffers(0, 1, &vbuffer, &vsize, &voffset);
  mContext->IASetIndexBuffer(nullptr, DXGI_FORMAT_R16_UINT, 0);
  mContext->IASetInputLayout(mInputLayout);
  mContext->RSSetViewports(1, &viewport);
  mContext->RSSetScissorRects(1, &scissor);
  mContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
  mContext->VSSetShader(mQuadVS, nullptr, 0);
  mContext->PSSetShader(mQuadPS, nullptr, 0);

  RefPtr<ID3D11ShaderResourceView> srView;
  HRESULT hr = mDevice->CreateShaderResourceView(aSource, nullptr,
                                                 getter_AddRefs(srView));
  if (FAILED(hr)) {
    gfxWarning() << "Could not create shader resource view for Oculus: "
                 << hexa(hr);
    return false;
  }
  ID3D11ShaderResourceView* viewPtr = srView.get();
  mContext->PSSetShaderResources(0 /* 0 == TexSlot::RGB */, 1, &viewPtr);
  // XXX Use Constant from TexSlot in CompositorD3D11.cpp?

  ID3D11SamplerState* sampler = mLinearSamplerState;
  mContext->PSSetSamplers(0, 1, &sampler);

  if (!UpdateConstantBuffers()) {
    NS_WARNING("Failed to update constant buffers for Oculus");
    return false;
  }

  mContext->Draw(4, 0);

  ovrResult orv =
      ovr_CommitTextureSwapChain(mSession->Get(), mSession->GetSwapChain());
  if (orv != ovrSuccess) {
    NS_WARNING("ovr_CommitTextureSwapChain failed.\n");
    return false;
  }

  ovrLayerEyeFov layer;
  memset(&layer, 0, sizeof(layer));
  layer.Header.Type = ovrLayerType_EyeFov;
  layer.Header.Flags = 0;
  layer.ColorTexture[0] = mSession->GetSwapChain();
  layer.ColorTexture[1] = nullptr;
  layer.Fov[0] = mFOVPort[0];
  layer.Fov[1] = mFOVPort[1];
  layer.Viewport[0].Pos.x = aSize.width * aLeftEyeRect.X();
  layer.Viewport[0].Pos.y = aSize.height * aLeftEyeRect.Y();
  layer.Viewport[0].Size.w = aSize.width * aLeftEyeRect.Width();
  layer.Viewport[0].Size.h = aSize.height * aLeftEyeRect.Height();
  layer.Viewport[1].Pos.x = aSize.width * aRightEyeRect.X();
  layer.Viewport[1].Pos.y = aSize.height * aRightEyeRect.Y();
  layer.Viewport[1].Size.w = aSize.width * aRightEyeRect.Width();
  layer.Viewport[1].Size.h = aSize.height * aRightEyeRect.Height();

  const VRHMDSensorState& sensorState = mDisplayInfo.GetSensorState();
  gfx::Matrix4x4 matView[2];
  memcpy(matView[0].components, sensorState.leftViewMatrix,
         sizeof(sensorState.leftViewMatrix));
  memcpy(matView[1].components, sensorState.rightViewMatrix,
         sizeof(sensorState.rightViewMatrix));

  for (uint32_t i = 0; i < 2; ++i) {
    Point3D eyeTranslation;
    Quaternion eyeRotation;
    Point3D eyeScale;
    if (!matView[i].Decompose(eyeTranslation, eyeRotation, eyeScale)) {
      NS_WARNING("Failed to decompose eye pose matrix for Oculus");
    }
    layer.RenderPose[i].Orientation.x = eyeRotation.x;
    layer.RenderPose[i].Orientation.y = eyeRotation.y;
    layer.RenderPose[i].Orientation.z = eyeRotation.z;
    layer.RenderPose[i].Orientation.w = eyeRotation.w;
    layer.RenderPose[i].Position.x = eyeTranslation.x;
    layer.RenderPose[i].Position.y = eyeTranslation.y;
    layer.RenderPose[i].Position.z = eyeTranslation.z;
  }

  ovrLayerHeader* layers = &layer.Header;
  orv = ovr_SubmitFrame(mSession->Get(), mDisplayInfo.mFrameId, nullptr,
                        &layers, 1);
  // ovr_SubmitFrame will fail during the Oculus health and safety warning.
  // and will start succeeding once the warning has been dismissed by the user.

  if (!OVR_UNQUALIFIED_SUCCESS(orv)) {
    /**
     * We wish to throttle the framerate for any case that the rendered
     * result is not visible.  In some cases, such as during the Oculus
     * "health and safety warning", orv will be > 0 (OVR_SUCCESS but not
     * OVR_UNQUALIFIED_SUCCESS) and ovr_SubmitFrame will not block.
     * In this case, returning true would have resulted in an unthrottled
     * render loop hiting excessive frame rates and consuming resources.
     */
    return false;
  }

  mSession->mSubmitThread = mSubmitThread;
  return true;
}

void VRDisplayOculus::Refresh() {
  mDisplayInfo.mIsConnected = mSession->IsTrackingReady();
  mDisplayInfo.mIsMounted = mSession->IsMounted();
}

VRControllerOculus::VRControllerOculus(dom::GamepadHand aHand,
                                       uint32_t aDisplayID)
    : VRControllerHost(VRDeviceType::Oculus, aHand, aDisplayID),
      mIndexTrigger(0.0f),
      mHandTrigger(0.0f),
      mVibrateThread(nullptr),
      mIsVibrateStopped(false) {
  MOZ_COUNT_CTOR_INHERITED(VRControllerOculus, VRControllerHost);

  char* touchID = "";
  switch (aHand) {
    case dom::GamepadHand::Left:
      touchID = "Oculus Touch (Left)";
      break;
    case dom::GamepadHand::Right:
      touchID = "Oculus Touch (Right)";
      break;
    default:
      MOZ_ASSERT(false);
      break;
  }
  mControllerInfo.mControllerName = touchID;

  MOZ_ASSERT(
      kNumOculusButton == static_cast<uint32_t>(
                              OculusLeftControllerButtonType::NumButtonType) &&
      kNumOculusButton == static_cast<uint32_t>(
                              OculusRightControllerButtonType::NumButtonType));

  mControllerInfo.mNumButtons = kNumOculusButton;
  mControllerInfo.mNumAxes =
      static_cast<uint32_t>(OculusControllerAxisType::NumVRControllerAxisType);
  mControllerInfo.mNumHaptics = kNumOculusHaptcs;
}

float VRControllerOculus::GetAxisMove(uint32_t aAxis) {
  return mAxisMove[aAxis];
}

void VRControllerOculus::SetAxisMove(uint32_t aAxis, float aValue) {
  mAxisMove[aAxis] = aValue;
}

float VRControllerOculus::GetIndexTrigger() { return mIndexTrigger; }

void VRControllerOculus::SetIndexTrigger(float aValue) {
  mIndexTrigger = aValue;
}

float VRControllerOculus::GetHandTrigger() { return mHandTrigger; }

void VRControllerOculus::SetHandTrigger(float aValue) { mHandTrigger = aValue; }

VRControllerOculus::~VRControllerOculus() {
  ShutdownVibrateHapticThread();
  MOZ_COUNT_DTOR_INHERITED(VRControllerOculus, VRControllerHost);
}

void VRControllerOculus::UpdateVibrateHaptic(ovrSession aSession,
                                             uint32_t aHapticIndex,
                                             double aIntensity,
                                             double aDuration,
                                             uint64_t aVibrateIndex,
                                             const VRManagerPromise& aPromise) {
  // UpdateVibrateHaptic() only can be called by mVibrateThread
  MOZ_ASSERT(mVibrateThread->GetThread() == NS_GetCurrentThread());

  // It has been interrupted by loss focus.
  if (mIsVibrateStopped) {
    VibrateHapticComplete(aSession, aPromise, true);
    return;
  }
  // Avoid the previous vibrate event to override the new one.
  if (mVibrateIndex != aVibrateIndex) {
    VibrateHapticComplete(aSession, aPromise, false);
    return;
  }

  const double duration = (aIntensity == 0) ? 0 : aDuration;
  // Vibration amplitude in the [0.0, 1.0] range.
  const float amplitude = aIntensity > 1.0 ? 1.0 : aIntensity;
  // Vibration is enabled by specifying the frequency.
  // Specifying 0.0f will disable the vibration, 0.5f will vibrate at 160Hz,
  // and 1.0f will vibrate at 320Hz.
  const float frequency = (duration > 0) ? 1.0f : 0.0f;
  ovrControllerType hand;

  switch (GetHand()) {
    case GamepadHand::Left:
      hand = ovrControllerType::ovrControllerType_LTouch;
      break;
    case GamepadHand::Right:
      hand = ovrControllerType::ovrControllerType_RTouch;
      break;
    default:
      MOZ_ASSERT(false);
      break;
  }

  // Oculus Touch only can get the response from ovr_SetControllerVibration()
  // at the presenting mode.
  ovrResult result = ovr_SetControllerVibration(
      aSession, hand, frequency, (frequency == 0.0f) ? 0.0f : amplitude);
  if (result != ovrSuccess) {
    printf_stderr("%s hand ovr_SetControllerVibration skipped.\n",
                  GamepadHandValues::strings[uint32_t(GetHand())].value);
  }

  // In Oculus dev doc, it mentions vibration lasts for a maximum of 2.5 seconds
  // at ovr_SetControllerVibration(), but we found 2.450 sec is more close to
  // the real looping use case.
  const double kVibrateRate = 2450.0;
  const double remainingTime =
      (duration > kVibrateRate) ? (duration - kVibrateRate) : duration;

  if (remainingTime) {
    MOZ_ASSERT(mVibrateThread);

    RefPtr<Runnable> runnable =
        NewRunnableMethod<ovrSession, uint32_t, double, double, uint64_t,
                          StoreCopyPassByConstLRef<VRManagerPromise>>(
            "VRControllerOculus::UpdateVibrateHaptic", this,
            &VRControllerOculus::UpdateVibrateHaptic, aSession, aHapticIndex,
            aIntensity, (duration > kVibrateRate) ? remainingTime : 0,
            aVibrateIndex, aPromise);
    mVibrateThread->PostDelayedTask(runnable.forget(), (duration > kVibrateRate)
                                                           ? kVibrateRate
                                                           : remainingTime);
  } else {
    VibrateHapticComplete(aSession, aPromise, true);
  }
}

void VRControllerOculus::VibrateHapticComplete(ovrSession aSession,
                                               const VRManagerPromise& aPromise,
                                               bool aStop) {
  if (aStop) {
    ovrControllerType hand;

    switch (GetHand()) {
      case GamepadHand::Left:
        hand = ovrControllerType::ovrControllerType_LTouch;
        break;
      case GamepadHand::Right:
        hand = ovrControllerType::ovrControllerType_RTouch;
        break;
      default:
        MOZ_ASSERT(false);
        break;
    }

    ovrResult result = ovr_SetControllerVibration(aSession, hand, 0.0f, 0.0f);
    if (result != ovrSuccess) {
      printf_stderr("%s Haptics skipped.\n",
                    GamepadHandValues::strings[uint32_t(GetHand())].value);
    }
  }

  VRManager* vm = VRManager::Get();
  MOZ_ASSERT(vm);

  VRListenerThreadHolder::Loop()->PostTask(
      NewRunnableMethod<StoreCopyPassByConstLRef<VRManagerPromise>>(
          "VRManager::NotifyVibrateHapticCompleted", vm,
          &VRManager::NotifyVibrateHapticCompleted, aPromise));
}

void VRControllerOculus::VibrateHaptic(ovrSession aSession,
                                       uint32_t aHapticIndex, double aIntensity,
                                       double aDuration,
                                       const VRManagerPromise& aPromise) {
  // Spinning up the haptics thread at the first haptics call.
  if (!mVibrateThread) {
    mVibrateThread = new VRThread(NS_LITERAL_CSTRING("Oculus_Vibration"));
  }
  mVibrateThread->Start();
  ++mVibrateIndex;
  mIsVibrateStopped = false;

  RefPtr<Runnable> runnable =
      NewRunnableMethod<ovrSession, uint32_t, double, double, uint64_t,
                        StoreCopyPassByConstLRef<VRManagerPromise>>(
          "VRControllerOculus::UpdateVibrateHaptic", this,
          &VRControllerOculus::UpdateVibrateHaptic, aSession, aHapticIndex,
          aIntensity, aDuration, mVibrateIndex, aPromise);
  mVibrateThread->PostTask(runnable.forget());
}

void VRControllerOculus::StopVibrateHaptic() { mIsVibrateStopped = true; }

void VRControllerOculus::ShutdownVibrateHapticThread() {
  StopVibrateHaptic();
  if (mVibrateThread) {
    mVibrateThread->Shutdown();
    mVibrateThread = nullptr;
  }
}

/*static*/ already_AddRefed<VRSystemManagerOculus>
VRSystemManagerOculus::Create() {
  MOZ_ASSERT(NS_IsMainThread());

  if (!gfxPrefs::VREnabled() || !gfxPrefs::VROculusEnabled()) {
    return nullptr;
  }

  RefPtr<VRSystemManagerOculus> manager = new VRSystemManagerOculus();
  return manager.forget();
}

VRSystemManagerOculus::VRSystemManagerOculus() : mSession(nullptr) {}

void VRSystemManagerOculus::Destroy() {
  Shutdown();
  mSession = nullptr;
}

void VRSystemManagerOculus::Shutdown() {
  if (mSession) {
    mSession->StopTracking();
  }
  RemoveControllers();
  if (mDisplay) {
    mDisplay->Destroy();
  }
  mDisplay = nullptr;
}

void VRSystemManagerOculus::NotifyVSync() {
  VRSystemManager::NotifyVSync();
  if (!mSession) {
    return;
  }
  mSession->Refresh();
  if (mDisplay) {
    mDisplay->Refresh();
  }
  // Detect disconnection
  if (!mSession->IsTrackingReady()) {
    // No HMD connected
    mDisplay = nullptr;
    // Prevent enumeration from continuously running
    // after the headset is disconnected.
    mSession->StopTracking();
  }
}

bool VRSystemManagerOculus::ShouldInhibitEnumeration() {
  if (VRSystemManager::ShouldInhibitEnumeration()) {
    return true;
  }
  if (mDisplay) {
    // When we find an Oculus VR device, don't
    // allow any further enumeration as it
    // may get picked up redundantly by other
    // API's such as OpenVR.
    return true;
  }
  if (mSession && mSession->IsQuitTimeoutActive()) {
    // When we are responding to ShouldQuit, we return true here
    // to prevent further enumeration by other VRSystemManager's such as
    // VRSystemManagerOpenVR which would also enumerate the connected Oculus
    // HMD, resulting in interference with the Oculus runtime software updates.
    return true;
  }
  return false;
}

void VRSystemManagerOculus::Enumerate() {
  if (!mSession) {
    mSession = new VROculusSession();
  }
  mSession->StartTracking();
  if (mDisplay == nullptr && mSession->IsTrackingReady()) {
    // HMD Detected
    mDisplay = new VRDisplayOculus(mSession);
  }
  if (mDisplay == nullptr) {
    // Prevent enumeration from continuously running
    // when a headset was not found.
    mSession->StopTracking();
  }
}

void VRSystemManagerOculus::GetHMDs(
    nsTArray<RefPtr<VRDisplayHost>>& aHMDResult) {
  if (mDisplay) {
    aHMDResult.AppendElement(mDisplay);
  }
}

bool VRSystemManagerOculus::GetIsPresenting() {
  if (mDisplay) {
    VRDisplayInfo displayInfo(mDisplay->GetDisplayInfo());
    return displayInfo.GetPresentingGroups() != 0;
  }

  return false;
}

void VRSystemManagerOculus::HandleInput() {
  // The session is available after VRDisplay is created
  // at GetHMDs().
  if (!mSession || !mSession->IsTrackingReady()) {
    return;
  }

  RefPtr<impl::VRControllerOculus> controller;
  ovrInputState inputState;
  uint32_t axis = 0;
  const bool hasInputState =
      ovr_GetInputState(mSession->Get(), ovrControllerType_Touch,
                        &inputState) == ovrSuccess;

  if (!hasInputState) {
    return;
  }

  for (uint32_t i = 0; i < mOculusController.Length(); ++i) {
    controller = mOculusController[i];
    const GamepadHand hand = controller->GetHand();
    const uint32_t handIdx = static_cast<uint32_t>(hand) - 1;
    uint32_t buttonIdx = 0;

    switch (hand) {
      case dom::GamepadHand::Left:
        HandleButtonPress(i, buttonIdx, ovrButton_LThumb, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleIndexTriggerPress(i, buttonIdx, inputState.IndexTrigger[handIdx]);
        ++buttonIdx;
        HandleHandTriggerPress(i, buttonIdx, inputState.HandTrigger[handIdx]);
        ++buttonIdx;
        HandleButtonPress(i, buttonIdx, ovrButton_X, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleButtonPress(i, buttonIdx, ovrButton_Y, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleTouchEvent(i, buttonIdx, ovrTouch_LThumbRest, inputState.Touches);
        ++buttonIdx;
        break;
      case dom::GamepadHand::Right:
        HandleButtonPress(i, buttonIdx, ovrButton_RThumb, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleIndexTriggerPress(i, buttonIdx, inputState.IndexTrigger[handIdx]);
        ++buttonIdx;
        HandleHandTriggerPress(i, buttonIdx, inputState.HandTrigger[handIdx]);
        ++buttonIdx;
        HandleButtonPress(i, buttonIdx, ovrButton_A, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleButtonPress(i, buttonIdx, ovrButton_B, inputState.Buttons,
                          inputState.Touches);
        ++buttonIdx;
        HandleTouchEvent(i, buttonIdx, ovrTouch_RThumbRest, inputState.Touches);
        ++buttonIdx;
        break;
      default:
        MOZ_ASSERT(false);
        break;
    }
    controller->SetButtonPressed(inputState.Buttons);
    controller->SetButtonTouched(inputState.Touches);

    axis = static_cast<uint32_t>(OculusControllerAxisType::ThumbstickXAxis);
    HandleAxisMove(i, axis, inputState.Thumbstick[i].x);

    axis = static_cast<uint32_t>(OculusControllerAxisType::ThumbstickYAxis);
    HandleAxisMove(i, axis, -inputState.Thumbstick[i].y);

    // Process pose state.
    GamepadPoseState poseState;
    GetControllerPoseState(handIdx, poseState);
    HandlePoseTracking(i, poseState, controller);
  }
}

void VRSystemManagerOculus::GetControllerPoseState(uint32_t aHandIdx,
                                                   GamepadPoseState& aPoseState,
                                                   bool aForceUpdate) {
  ovrTrackingState state = ovr_GetTrackingState(mSession->Get(), 0.0, false);

  // HandPoses is ordered by ovrControllerType_LTouch and
  // ovrControllerType_RTouch, therefore, we can't get its state by the index of
  // mOculusController.
  ovrPoseStatef& pose(state.HandPoses[aHandIdx]);

  if (aForceUpdate ||
      state.HandStatusFlags[aHandIdx] & ovrStatus_OrientationTracked) {
    aPoseState.flags |= GamepadCapabilityFlags::Cap_Orientation;
    aPoseState.orientation[0] = pose.ThePose.Orientation.x;
    aPoseState.orientation[1] = pose.ThePose.Orientation.y;
    aPoseState.orientation[2] = pose.ThePose.Orientation.z;
    aPoseState.orientation[3] = pose.ThePose.Orientation.w;
    aPoseState.angularVelocity[0] = pose.AngularVelocity.x;
    aPoseState.angularVelocity[1] = pose.AngularVelocity.y;
    aPoseState.angularVelocity[2] = pose.AngularVelocity.z;

    aPoseState.flags |= GamepadCapabilityFlags::Cap_AngularAcceleration;
    aPoseState.angularAcceleration[0] = pose.AngularAcceleration.x;
    aPoseState.angularAcceleration[1] = pose.AngularAcceleration.y;
    aPoseState.angularAcceleration[2] = pose.AngularAcceleration.z;
    aPoseState.isOrientationValid = true;
  }
  if (aForceUpdate ||
      state.HandStatusFlags[aHandIdx] & ovrStatus_PositionTracked) {
    aPoseState.flags |= GamepadCapabilityFlags::Cap_Position;
    aPoseState.position[0] = pose.ThePose.Position.x;
    aPoseState.position[1] = pose.ThePose.Position.y;
    aPoseState.position[2] = pose.ThePose.Position.z;
    aPoseState.linearVelocity[0] = pose.LinearVelocity.x;
    aPoseState.linearVelocity[1] = pose.LinearVelocity.y;
    aPoseState.linearVelocity[2] = pose.LinearVelocity.z;

    aPoseState.flags |= GamepadCapabilityFlags::Cap_LinearAcceleration;
    aPoseState.linearAcceleration[0] = pose.LinearAcceleration.x;
    aPoseState.linearAcceleration[1] = pose.LinearAcceleration.y;
    aPoseState.linearAcceleration[2] = pose.LinearAcceleration.z;

    float eyeHeight = ovr_GetFloat(mSession->Get(), OVR_KEY_EYE_HEIGHT,
                                   OVR_DEFAULT_EYE_HEIGHT);
    aPoseState.position[1] -= eyeHeight;
    aPoseState.isPositionValid = true;
  }
}

void VRSystemManagerOculus::HandleButtonPress(uint32_t aControllerIdx,
                                              uint32_t aButton,
                                              uint64_t aButtonMask,
                                              uint64_t aButtonPressed,
                                              uint64_t aButtonTouched) {
  RefPtr<impl::VRControllerOculus> controller(
      mOculusController[aControllerIdx]);
  MOZ_ASSERT(controller);
  const uint64_t pressedDiff =
      (controller->GetButtonPressed() ^ aButtonPressed);
  const uint64_t touchedDiff =
      (controller->GetButtonTouched() ^ aButtonTouched);

  if (!pressedDiff && !touchedDiff) {
    return;
  }

  if (pressedDiff & aButtonMask || touchedDiff & aButtonMask) {
    // diff & (aButtonPressed, aButtonTouched) would be true while a new button
    // pressed or touched event, otherwise it is an old event and needs to
    // notify the button has been released.
    NewButtonEvent(aControllerIdx, aButton, aButtonMask & aButtonPressed,
                   aButtonMask & aButtonTouched,
                   (aButtonMask & aButtonPressed) ? 1.0L : 0.0L);
  }
}

void VRSystemManagerOculus::HandleIndexTriggerPress(uint32_t aControllerIdx,
                                                    uint32_t aButton,
                                                    float aValue) {
  RefPtr<impl::VRControllerOculus> controller(
      mOculusController[aControllerIdx]);
  MOZ_ASSERT(controller);
  const float oldValue = controller->GetIndexTrigger();
  // We prefer to let developers to set their own threshold for the adjustment.
  // Therefore, we don't check ButtonPressed and ButtonTouched with TouchMask
  // here. we just check the button value is larger than the threshold value or
  // not.
  const float threshold = gfxPrefs::VRControllerTriggerThreshold();

  // Avoid sending duplicated events in IPC channels.
  if (oldValue != aValue) {
    NewButtonEvent(aControllerIdx, aButton, aValue > threshold,
                   aValue > threshold, aValue);
    controller->SetIndexTrigger(aValue);
  }
}

void VRSystemManagerOculus::HandleHandTriggerPress(uint32_t aControllerIdx,
                                                   uint32_t aButton,
                                                   float aValue) {
  RefPtr<impl::VRControllerOculus> controller(
      mOculusController[aControllerIdx]);
  MOZ_ASSERT(controller);
  const float oldValue = controller->GetHandTrigger();
  // We prefer to let developers to set their own threshold for the adjustment.
  // Therefore, we don't check ButtonPressed and ButtonTouched with TouchMask
  // here. we just check the button value is larger than the threshold value or
  // not.
  const float threshold = gfxPrefs::VRControllerTriggerThreshold();

  // Avoid sending duplicated events in IPC channels.
  if (oldValue != aValue) {
    NewButtonEvent(aControllerIdx, aButton, aValue > threshold,
                   aValue > threshold, aValue);
    controller->SetHandTrigger(aValue);
  }
}

void VRSystemManagerOculus::HandleTouchEvent(uint32_t aControllerIdx,
                                             uint32_t aButton,
                                             uint64_t aTouchMask,
                                             uint64_t aButtonTouched) {
  RefPtr<impl::VRControllerOculus> controller(
      mOculusController[aControllerIdx]);
  MOZ_ASSERT(controller);
  const uint64_t touchedDiff =
      (controller->GetButtonTouched() ^ aButtonTouched);

  if (touchedDiff & aTouchMask) {
    NewButtonEvent(aControllerIdx, aButton, false, aTouchMask & aButtonTouched,
                   0.0f);
  }
}

void VRSystemManagerOculus::HandleAxisMove(uint32_t aControllerIdx,
                                           uint32_t aAxis, float aValue) {
  RefPtr<impl::VRControllerOculus> controller(
      mOculusController[aControllerIdx]);
  MOZ_ASSERT(controller);
  float value = aValue;

  if (abs(aValue) < 0.0000009f) {
    value = 0.0f;  // Clear noise signal
  }

  if (controller->GetAxisMove(aAxis) != value) {
    NewAxisMove(aControllerIdx, aAxis, value);
    controller->SetAxisMove(aAxis, value);
  }
}

void VRSystemManagerOculus::HandlePoseTracking(uint32_t aControllerIdx,
                                               const GamepadPoseState& aPose,
                                               VRControllerHost* aController) {
  MOZ_ASSERT(aController);
  if (aPose != aController->GetPose()) {
    aController->SetPose(aPose);
    NewPoseState(aControllerIdx, aPose);
  }
}

void VRSystemManagerOculus::VibrateHaptic(uint32_t aControllerIdx,
                                          uint32_t aHapticIndex,
                                          double aIntensity, double aDuration,
                                          const VRManagerPromise& aPromise) {
  // The session is available after VRDisplay is created
  // at GetHMDs().
  if (!mSession || !mSession->IsTrackingReady() ||
      (aControllerIdx >= mOculusController.Length())) {
    return;
  }

  RefPtr<impl::VRControllerOculus> controller =
      mOculusController[aControllerIdx];
  MOZ_ASSERT(controller);

  controller->VibrateHaptic(mSession->Get(), aHapticIndex, aIntensity,
                            aDuration, aPromise);
}

void VRSystemManagerOculus::StopVibrateHaptic(uint32_t aControllerIdx) {
  // The session is available after VRDisplay is created
  // at GetHMDs().
  if (!mSession || !mSession->IsTrackingReady() ||
      (aControllerIdx >= mOculusController.Length())) {
    return;
  }

  RefPtr<impl::VRControllerOculus> controller =
      mOculusController[aControllerIdx];
  MOZ_ASSERT(controller);

  controller->StopVibrateHaptic();
}

void VRSystemManagerOculus::GetControllers(
    nsTArray<RefPtr<VRControllerHost>>& aControllerResult) {
  aControllerResult.Clear();
  for (uint32_t i = 0; i < mOculusController.Length(); ++i) {
    aControllerResult.AppendElement(mOculusController[i]);
  }
}

void VRSystemManagerOculus::ScanForControllers() {
  // mSession is available after VRDisplay is created
  // at GetHMDs().
  if (!mSession || !mSession->IsTrackingReady()) {
    return;
  }

  ovrInputState inputState;
  bool hasInputState =
      ovr_GetInputState(mSession->Get(), ovrControllerType_Touch,
                        &inputState) == ovrSuccess;

  if (!hasInputState) {
    return;
  }

  ovrControllerType activeControllerArray[2];
  uint32_t newControllerCount = 0;

  if (inputState.ControllerType & ovrControllerType_LTouch) {
    activeControllerArray[newControllerCount] = ovrControllerType_LTouch;
    ++newControllerCount;
  }

  if (inputState.ControllerType & ovrControllerType_RTouch) {
    activeControllerArray[newControllerCount] = ovrControllerType_RTouch;
    ++newControllerCount;
  }

  if (newControllerCount != mControllerCount) {
    RemoveControllers();

    // Re-adding controllers to VRControllerManager.
    for (uint32_t i = 0; i < newControllerCount; ++i) {
      GamepadHand hand;

      switch (activeControllerArray[i]) {
        case ovrControllerType::ovrControllerType_LTouch:
          hand = GamepadHand::Left;
          break;
        case ovrControllerType::ovrControllerType_RTouch:
          hand = GamepadHand::Right;
          break;
      }
      RefPtr<VRControllerOculus> oculusController = new VRControllerOculus(
          hand, mDisplay->GetDisplayInfo().GetDisplayID());
      mOculusController.AppendElement(oculusController);

      // Not already present, add it.
      AddGamepad(oculusController->GetControllerInfo());

      // Process pose state.
      // We wanna Oculus Touch has the right position when it shows up,
      // so we force to update the pose no matter if it has OrientationTracked
      // or PositionTracked.
      const uint32_t handIdx = static_cast<uint32_t>(hand) - 1;
      GamepadPoseState poseState;
      GetControllerPoseState(handIdx, poseState, true);
      HandlePoseTracking(i, poseState, oculusController);

      ++mControllerCount;
    }
  }
}

void VRSystemManagerOculus::RemoveControllers() {
  // controller count is changed, removing the existing gamepads first.
  for (uint32_t i = 0; i < mOculusController.Length(); ++i) {
    mOculusController[i]->ShutdownVibrateHapticThread();
    RemoveGamepad(i);
  }

  mOculusController.Clear();
  mControllerCount = 0;
}