C++ VRManager类代码示例

mozilla::ipc::IPCResult
VRManagerParent::RecvCreateVRServiceTestController(const nsCString& aID, const uint32_t& aPromiseID)
{
  uint32_t controllerIdx = 0;
  nsTArray<VRControllerInfo> controllerInfoArray;
  impl::VRControllerPuppet* controllerPuppet = nullptr;
  VRManager* vm = VRManager::Get();

  // Get VRControllerPuppet from VRManager
  vm->GetVRControllerInfo(controllerInfoArray);
  for (auto& controllerInfo : controllerInfoArray) {
    if (controllerInfo.GetType() == VRDeviceType::Puppet) {
      if (controllerIdx == mControllerTestID) {
        controllerPuppet = static_cast<impl::VRControllerPuppet*>(
                           vm->GetController(controllerInfo.GetControllerID()).get());
        break;
      }
      ++controllerIdx;
    }
  }

  MOZ_ASSERT(controllerPuppet);
  MOZ_ASSERT(mControllerTestID < 2); // We have only two controllers in VRSystemManagerPuppet.

  if (!mVRControllerTests.Get(mControllerTestID, nullptr)) {
    mVRControllerTests.Put(mControllerTestID, controllerPuppet);
  }

  if (SendReplyCreateVRServiceTestController(aID, aPromiseID, mControllerTestID)) {
    ++mControllerTestID;
    return IPC_OK();
  }

  return IPC_FAIL(this, "SendReplyCreateVRServiceTestController fail");
}

void
VRManagerParent::RegisterWithManager()
{
  VRManager* vm = VRManager::Get();
  vm->AddVRManagerParent(this);
  mVRManagerHolder = vm;
}

mozilla::ipc::IPCResult
VRManagerParent::RecvGetDisplays(nsTArray<VRDisplayInfo> *aDisplays)
{
  VRManager* vm = VRManager::Get();
  vm->GetVRDisplayInfo(*aDisplays);
  return IPC_OK();
}

mozilla::ipc::IPCResult
VRManagerParent::RecvStopVibrateHaptic(const uint32_t& aControllerIdx)
{
  VRManager* vm = VRManager::Get();
  vm->StopVibrateHaptic(aControllerIdx);
  return IPC_OK();
}

bool
VRLayerParent::RecvSubmitFrame(PTextureParent* texture)
{
  VRManager* vm = VRManager::Get();
  vm->SubmitFrame(this, texture, mLeftEyeRect, mRightEyeRect);

  return true;
}

void
CompositorVsyncScheduler::DispatchVREvents(TimeStamp aVsyncTimestamp)
{
  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());

  VRManager* vm = VRManager::Get();
  vm->NotifyVsync(aVsyncTimestamp);
}

mozilla::ipc::IPCResult
VRLayerParent::RecvSubmitFrame(PTextureParent* texture)
{
  if (mVRDisplayID) {
    VRManager* vm = VRManager::Get();
    vm->SubmitFrame(this, texture, mLeftEyeRect, mRightEyeRect);
  }

  return IPC_OK();
}

void
VRDisplayHost::SubmitFrame(VRLayerParent* aLayer, PTextureParent* aTexture,
                           const gfx::Rect& aLeftEyeRect,
                           const gfx::Rect& aRightEyeRect)
{
  if ((mDisplayInfo.mGroupMask & aLayer->GetGroup()) == 0) {
    // Suppress layers hidden by the group mask
    return;
  }

  TextureHost* th = TextureHost::AsTextureHost(aTexture);
  // WebVR doesn't use the compositor to compose the frame, so use
  // AutoLockTextureHostWithoutCompositor here.
  AutoLockTextureHostWithoutCompositor autoLock(th);
  if (autoLock.Failed()) {
    NS_WARNING("Failed to lock the VR layer texture");
    return;
  }

  CompositableTextureSourceRef source;
  if (!th->BindTextureSource(source)) {
    NS_WARNING("The TextureHost was successfully locked but can't provide a TextureSource");
    return;
  }
  MOZ_ASSERT(source);

  IntSize texSize = source->GetSize();

  TextureSourceD3D11* sourceD3D11 = source->AsSourceD3D11();
  if (!sourceD3D11) {
    NS_WARNING("WebVR support currently only implemented for D3D11");
    return;
  }

  if (!SubmitFrame(sourceD3D11, texSize, aLeftEyeRect, aRightEyeRect)) {
    return;
  }

  /**
   * 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
   * NotifyVRVsync immediately, as it will run unbounded.
   * If NotifyVRVsync is not called here due to SubmitFrame failing, the
   * fallback "watchdog" code in VRDisplayHost::NotifyVSync() will cause
   * frames to continue at a lower refresh rate until frame submission
   * succeeds again.
   */
  VRManager *vm = VRManager::Get();
  MOZ_ASSERT(vm);
  vm->NotifyVRVsync(mDisplayInfo.mDisplayID);
}

void
VRDisplayHost::RemoveLayer(VRLayerParent *aLayer)
{
    mLayers.RemoveElement(aLayer);
    if (mLayers.Length() == 0) {
        StopPresentation();
    }
    mDisplayInfo.mIsPresenting = mLayers.Length() > 0;

    // Ensure that the content process receives the change immediately
    VRManager* vm = VRManager::Get();
    vm->RefreshVRDisplays();
}