station_obscurum_unity/Assets/Scripts/Game/InGameManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;

public class InGameManager : MonoBehaviour
{
    [SerializeField] private Volume gameVolume;

    [SerializeField] private Volume pausedVolume;

    [SerializeField] private bool isPaused;

    // [SerializeField]
    //private float pauseTransitionDuration = 1f;

    [SerializeField] private Canvas gameCanvas;

    [SerializeField] private Canvas pausedCanvas;

    [SerializeField] private List<AudioSource> sounds = new();

    private readonly List<float> initSoundVolumes = new();
    private bool isTransitioning;

    public bool IsPaused => isPaused;

    // Start is called before the first frame update
    private void Start()
    {
        isPaused = false;
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = isPaused;
        gameVolume.weight = 1;
        pausedVolume.weight = 0;
        gameCanvas.gameObject.SetActive(true);
        pausedCanvas.gameObject.SetActive(false);

        foreach (var source in sounds) initSoundVolumes.Add(source.volume);
    }

    // Update is called once per frame
    private void Update()
    {
        if (Input.GetButtonDown("Pause")) TogglePause();

        if (isTransitioning || true)
        {
            if (isPaused)
            {
                //transition into pause

                //gameVolume.weight = Mathf.Lerp(gameVolume.weight, 0, Time.deltaTime);
                //pausedVolume.weight = Mathf.Lerp(pausedVolume.weight, 1, Time.deltaTime);

                //gameVolume.weight = gameVolume.weight < 0.1 ? 0 : gameVolume.weight;
                //pausedVolume.weight = pausedVolume.weight > 0.9 ? 1 : pausedVolume.weight;
                gameVolume.weight = 0;
                pausedVolume.weight = 1;
            }
            else
            {
                //transition out of pause

                gameVolume.weight = 1;
                pausedVolume.weight = 0;
            }
        }
    }

    public void TogglePause()
    {
        if (!isTransitioning)
        {
            isPaused = !isPaused;
            Cursor.visible = isPaused;
            if (!isPaused)
                Cursor.lockState = CursorLockMode.Locked;
            else
                Cursor.lockState = CursorLockMode.None;
            StartCoroutine(pauseTransition());
        }
    }

    public void UnPause()
    {
        if (!isTransitioning)
        {
            isPaused = false;
            Cursor.lockState = CursorLockMode.Locked;
            Cursor.visible = isPaused;
            StartCoroutine(pauseTransition());
        }
    }

    public void Pause()
    {
        if (!isTransitioning)
        {
            isPaused = true;
            Cursor.lockState = CursorLockMode.None;
            Cursor.visible = isPaused;
            StartCoroutine(pauseTransition());
        }
    }

    private IEnumerator pauseTransition()
    {
        if (pausedCanvas.gameObject.activeInHierarchy && !isPaused) pausedCanvas.gameObject.SetActive(false);
        if (gameCanvas.gameObject.activeInHierarchy && isPaused) gameCanvas.gameObject.SetActive(false);

        isTransitioning = true;
        yield return new WaitForSeconds(0);
        isTransitioning = false;
        print("Unpause canvas?" + isPaused + "," + pausedCanvas.gameObject.activeInHierarchy);
        if (!pausedCanvas.gameObject.activeInHierarchy && isPaused) pausedCanvas.gameObject.SetActive(true);
        if (!gameCanvas.gameObject.activeInHierarchy && !isPaused) gameCanvas.gameObject.SetActive(true);
    }


    public void SetVolume(float volume)
    {
        for (var i = 0; i < sounds.Count; i++) sounds[i].volume = initSoundVolumes[i] * volume;
    }

    public void ExitToMenu()
    {
        SceneManager.LoadScene(0);
    }
}