SteamVR_Ears.cs

//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: Handles aligning audio listener when using speakers.
//
//=============================================================================

using UnityEngine;
using Valve.VR;

[RequireComponent(typeof(AudioListener))]
public class SteamVR_Ears : MonoBehaviour
{
    public SteamVR_Camera vrcam;

    bool usingSpeakers;
    Quaternion offset;

    private void OnNewPosesApplied()
    {
        var origin = vrcam.origin;
        var baseRotation = origin != null ? origin.rotation : Quaternion.identity;
        transform.rotation = baseRotation * offset;
    }

    void OnEnable()
    {
        usingSpeakers = false;

        var settings = OpenVR.Settings;
        if (settings != null)
        {
            var error = EVRSettingsError.None;
            if (settings.GetBool(OpenVR.k_pch_SteamVR_Section, OpenVR.k_pch_SteamVR_UsingSpeakers_Bool, ref error))
            {
                usingSpeakers = true;

                var yawOffset = settings.GetFloat(OpenVR.k_pch_SteamVR_Section, OpenVR.k_pch_SteamVR_SpeakersForwardYawOffsetDegrees_Float, ref error);
                offset = Quaternion.Euler(0.0f, yawOffset, 0.0f);
            }
        }

        if (usingSpeakers)
            SteamVR_Events.NewPosesApplied.Listen(OnNewPosesApplied);
    }

    void OnDisable()
    {
        if (usingSpeakers)
            SteamVR_Events.NewPosesApplied.Remove(OnNewPosesApplied);
    }
}