finished quality setting, fullscreen and resolution in menu

3D/Assets/Scripts/OptionMenu.cs

@@ -2,9 +2,42 @@ using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Audio;
+using UnityEngine.UI;
 
 public class OptionMenu : MonoBehaviour
 {
+    //Resolution
+    Resolution[] resolutions;
+    public Dropdown resolutionDropdown;
+
+    private void Start() {
+        resolutions = Screen.resolutions;
+        resolutionDropdown.ClearOptions();
+
+        List<string> options = new List<string>();
+
+        int currentResIndex = 0;
+
+        for (int i = 0; i < resolutions.Length; i++) {
+            string option = resolutions[i].width + " x " +  resolutions[i].height;
+            options.Add(option);
+
+            if(resolutions[i].width == Screen.currentResolution.width && resolutions[i].height == Screen.currentResolution.height) {
+                currentResIndex = i;
+            }
+        }
+
+        resolutionDropdown.AddOptions(options);
+        resolutionDropdown.value = currentResIndex;
+        resolutionDropdown.RefreshShownValue();
+    }
+
+    public void setResolution(int resolutionIndex) {
+        Resolution resolution = resolutions[resolutionIndex];
+        Screen.SetResolution(resolution.width, resolution.height, Screen.fullScreen);
+    }
+
+    //Audio
     public AudioMixer mixer;
 
     public void SetMainVolume(float mainVolume) {
@@ -16,4 +49,14 @@ public class OptionMenu : MonoBehaviour
     public void SetSfxVolume(float sfxVolume) {
         mixer.SetFloat("sfxVolume", sfxVolume);
     }
+
+    //Quality
+    public void setQuality(int qualityIndex) {
+        QualitySettings.SetQualityLevel(qualityIndex);
+    }
+
+    //Fullscreen
+    public void setFullscreen(bool isFullscreen) {
+        Screen.fullScreen = isFullscreen;
+    }
 }