Unity Screen Setting

Unity Screen Setting.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.SceneManagement;

public class ScreenSettings : MonoBehaviour
{
    static bool isFullScreen = true;
    public Image IsFullScreenImage;
    FullScreenMode Screen_Mode;

    List<Resolution> resolutions = new List<Resolution>();
    [SerializeField] Vector3[] res_list = new Vector3[30];
    [SerializeField] TMP_Dropdown resolutionsDropdown;
    int if_x, if_y;
    bool if_bool;

    [SerializeField] int resolutionNum;
    // Start is called before the first frame update
    private void Awake()
    {
        if (Screen.fullScreenMode == FullScreenMode.MaximizedWindow)
        {
            IsFullScreenImage.gameObject.SetActive(true);
            isFullScreen = true;
        }
        else if(Screen.fullScreenMode == FullScreenMode.Windowed)
        {
            IsFullScreenImage.gameObject.SetActive(false);
            isFullScreen = false;
        }
    }
    void Start()
    {
        Set_Res();
    }

    void Set_Res()
    {
        resolutions.AddRange(Screen.resolutions);

        int optionNum = 0;
        var r = 0;
        Vector3 resolution_check = new Vector3(0, 0, 0);

        foreach (Resolution item in resolutions)
        {
            var MAX = GCD(item.width, item.height);
            if (MAX != 0 && item.refreshRate >= 60)
                if ((((item.width / MAX == 16) || (item.width / MAX == 8)) || (item.width / MAX == if_x)) && (((item.height / MAX == 9) || (item.height / MAX == 5)) || (item.height / MAX == if_y)))
                {
                    //Debug.Log(item.width + "x" + item.height + " " + item.refreshRate);
                    res_list[r++] = new Vector3(item.width, item.height, item.refreshRate);
                    if (resolution_check == new Vector3(0, 0, 0))
                        resolution_check = new Vector3(item.width, item.height, item.refreshRate);
                    else if ((item.width == resolution_check.x && item.height == resolution_check.y) && item.refreshRate != resolution_check.z)
                        r--;

                    resolution_check = new Vector3(item.width, item.height, item.refreshRate);
                    if ((resolution_check.x == Screen.width && resolution_check.y == Screen.height) && if_bool != true)
                    {
                        if_bool = true;
                    }
                }
        }

        if (!if_bool)
        {
            PlayerPrefs.SetInt("Screen_Ratio_X", Screen.width);
            PlayerPrefs.SetInt("Screen_Ratio_Y", Screen.height);
        }

        if_x = PlayerPrefs.GetInt("Screen_Ratio_X", 0);
        if_y = PlayerPrefs.GetInt("Screen_Ratio_Y", 0);

        resolutionsDropdown.options.Clear();

        foreach (Resolution item in resolutions)
        {
            var MAX = GCD(item.width, item.height);
            if (MAX != 0 && item.refreshRate >= 60)
                if ((((item.width / MAX == 16) || (item.width / MAX == 8)) || (item.width / MAX == if_x)) && (((item.height / MAX == 9) || (item.height / MAX == 5)) || (item.height / MAX == if_y)))
                {
                    TMP_Dropdown.OptionData option = new TMP_Dropdown.OptionData();
                    option.text = item.width + "x" + item.height;
                    resolutionsDropdown.options.Add(option);

                    if (resolution_check == new Vector3(0, 0, 0))
                        resolution_check = new Vector3(item.width, item.height, item.refreshRate);
                    else if ((item.width == resolution_check.x && item.height == resolution_check.y) && item.refreshRate != resolution_check.z)
                        resolutionsDropdown.options.Remove(option);

                    resolution_check = new Vector3(item.width, item.height, item.refreshRate);

                    if (item.width == Screen.width && item.height == Screen.height)
                        resolutionsDropdown.value = optionNum;
                    optionNum++;
                }
        }

        if (if_x != 0 && if_y != 0)
        {
            res_list[r++] = new Vector3(if_x, if_y, 60);
            TMP_Dropdown.OptionData option = new TMP_Dropdown.OptionData();
            option.text = if_x + "x" + if_y;
            resolutionsDropdown.options.Add(option);

            if (Screen.currentResolution.width == if_x && Screen.currentResolution.height == if_y)
                resolutionsDropdown.value = resolutionsDropdown.options.Count;
        }

        resolutionsDropdown.RefreshShownValue();
    }

    public void FullScreenOnOff()
    {
        if (isFullScreen)
        {
            isFullScreen = false;
            FullScrrenCheck(isFullScreen);
            IsFullScreenImage.gameObject.SetActive(false);
            Change_Resolution();
        }
        else
        {
            isFullScreen = true;
            FullScrrenCheck(isFullScreen);
            IsFullScreenImage.gameObject.SetActive(true);
            Change_Resolution();
        }
    }

    public void DropboxoptionChange(int x)
    {
        resolutionNum = x;
    }

    int GCD(int x, int y)
    {
        if (y == 0)
        {
            return x;
        }

        int r = x % y;

        return GCD(y, r);
    }

    public void Change_Resolution()
    {
        Screen.SetResolution((int)res_list[resolutionNum].x,
            (int)res_list[resolutionNum].y,
            Screen_Mode);

        PlayerPrefs.SetInt("Screen_X", (int)res_list[resolutionNum].x);
        PlayerPrefs.SetInt("Screen_Y", (int)res_list[resolutionNum].y);
    }

    void FullScrrenCheck(bool Full)
    {
        if (Full)
        {
            Screen_Mode = FullScreenMode.ExclusiveFullScreen;
            //  Screen_Mode = FullScreenMode.MaximizedWindow;
        }
        else
        {
            Screen_Mode = FullScreenMode.Windowed;
        }
    }
}