QualitySettingManager.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// Quality setting manager.
/// To change the quality of graphics at runtime which will
/// increase quality and power consumption and may decrease framerate vice versa
/// </summary>
public class QualitySettingManager : MonoBehaviour {

	private string CURRENT_QUALITY_LEVEL = "CURRENT_QUALITY_LEVEL";

	private enum QUALITY_LEVEL
	{
		HIGH,
		MEDIUM,
		LOW
	};

	private QUALITY_LEVEL qualityLevel;

	#region MonoBehaviour methods
	// Use this for initialization
	void Start () {
		qualityLevel = (QUALITY_LEVEL)PlayerPrefs.GetInt (CURRENT_QUALITY_LEVEL);
		switch (qualityLevel) {
		case QUALITY_LEVEL.HIGH:
			setHighQuality ();
			break;
		case QUALITY_LEVEL.MEDIUM:
			setMediumQuality ();
			break;
		case QUALITY_LEVEL.LOW:
			setLowQuality ();
			break;
		default:
			break;
		}
	}
	
	// Update is called once per frame
	void Update () {
		
	}
	#endregion

	#region public methods

	/// <summary>
	/// Sets the high quality. max power use, low frame rate
	/// </summary>
	public void setHighQuality() {
		Application.targetFrameRate = 60;

		QualitySettings.vSyncCount = 0; 

		QualitySettings.antiAliasing = 4;
		QualitySettings.shadowCascades = 2;
		QualitySettings.shadowDistance = 1000;

		PlayerPrefs.SetInt (CURRENT_QUALITY_LEVEL,(int)QUALITY_LEVEL.HIGH);

		Debug.Log ("Current Quality Settings : High");
	}

	/// <summary>
	/// Sets the medium quality. optimal power use, ave frame rate
	/// </summary>
	public void setMediumQuality() {
		Application.targetFrameRate = 50;

		QualitySettings.vSyncCount = 0; 

		QualitySettings.antiAliasing = 2;
		QualitySettings.shadowCascades = 1;
		QualitySettings.shadowDistance = 500;

		PlayerPrefs.SetInt (CURRENT_QUALITY_LEVEL,(int)QUALITY_LEVEL.MEDIUM);

		Debug.Log ("Current Quality Settings : Medium");
	}


	/// <summary>
	/// Sets the low quality. low power use, high frame rate
	/// </summary>
	public void setLowQuality() {
		Application.targetFrameRate = 40;

		QualitySettings.vSyncCount = 0; 

		QualitySettings.antiAliasing = 0;
		QualitySettings.shadowCascades = 0;
		QualitySettings.shadowDistance = 200;

		PlayerPrefs.SetInt (CURRENT_QUALITY_LEVEL,(int)QUALITY_LEVEL.LOW);

		Debug.Log ("Current Quality Settings : Low");
	}

	public void enableShadow(bool arg) {
		if (arg) {
			switch (qualityLevel) {
			case QUALITY_LEVEL.HIGH:
				QualitySettings.shadowDistance = 1000;
				break;
			case QUALITY_LEVEL.MEDIUM:
				QualitySettings.shadowDistance = 500;
				break;
			case QUALITY_LEVEL.LOW:
				QualitySettings.shadowDistance = 200;
				break;
			default:
				break;
			}
		} else {
			QualitySettings.shadowDistance = 0;
		}
	}
	#endregion
}