Method GetTrackingState

Revive/InputManager.cpp:253–297

}

void InputManager::GetTrackingState(ovrSession session, ovrTrackingState* outState, double absTime)
{
	// Get the device poses
	vr::ETrackingUniverseOrigin origin = vr::VRCompositor()->GetTrackingSpace();
	vr::TrackedDevicePose_t poses[vr::k_unMaxTrackedDeviceCount];
	if (absTime > 0.0f)
	{
		uint32_t predictionID = (uint32_t)floor(absTime * session->HmdDesc.DisplayRefreshRate);
		vr::VRCompositor()->GetPosesForFrame(predictionID, poses, vr::k_unMaxTrackedDeviceCount);
	}
	else
	{
		vr::VRSystem()->GetDeviceToAbsoluteTrackingPose(origin, 0.0f, poses, vr::k_unMaxTrackedDeviceCount);
	}

	// Convert the head pose
	outState->HeadPose = TrackedDevicePoseToOVRPose(poses[vr::k_unTrackedDeviceIndex_Hmd], m_LastPoses[vr::k_unTrackedDeviceIndex_Hmd], absTime);
	outState->StatusFlags = TrackedDevicePoseToOVRStatusFlags(poses[vr::k_unTrackedDeviceIndex_Hmd]);

	// Convert the hand poses
	vr::TrackedDeviceIndex_t hands[] = { vr::VRSystem()->GetTrackedDeviceIndexForControllerRole(vr::TrackedControllerRole_LeftHand),
		vr::VRSystem()->GetTrackedDeviceIndexForControllerRole(vr::TrackedControllerRole_RightHand) };
	for (int i = 0; i < ovrHand_Count; i++)
	{
		if (hands[i] == vr::k_unTrackedDeviceIndexInvalid)
		{
			outState->HandPoses[i].ThePose = OVR::Posef::Identity();
			continue;
		}

		// Apply a 45-degree offset to better fit the Oculus Touch pose
		vr::TrackedDevicePose_t pose;
		vr::HmdMatrix34_t offset = REV::Matrix4f(OVR::Matrix4f::RotationX(-MATH_FLOAT_PIOVER4));
		vr::VRSystem()->ApplyTransform(&pose, &poses[hands[i]], &offset);

		outState->HandPoses[i] = TrackedDevicePoseToOVRPose(pose, m_LastHandPose[i], absTime);
		outState->HandStatusFlags[i] = TrackedDevicePoseToOVRStatusFlags(pose);
	}

	REV::Matrix4f calibratedOrigin = REV::Matrix4f(vr::VRSystem()->GetRawZeroPoseToStandingAbsoluteTrackingPose());
	if (origin == vr::TrackingUniverseSeated)
		calibratedOrigin *= REV::Matrix4f(vr::VRSystem()->GetSeatedZeroPoseToStandingAbsoluteTrackingPose()).Inverted();
	outState->CalibratedOrigin.Orientation = OVR::Quatf(calibratedOrigin);
	outState->CalibratedOrigin.Position = calibratedOrigin.GetTranslation();
}

ovrResult InputManager::GetDevicePoses(ovrSession session, ovrTrackedDeviceType* deviceTypes, int deviceCount, double absTime, ovrPoseStatef* outDevicePoses)
{