有些項目需要根據(jù)設(shè)備性能自動修改Quality的設(shè)置，如何判斷設(shè)備性能已經(jīng)在上一篇中講過了。這一篇把判斷設(shè)備性能和設(shè)置質(zhì)量放到一起去，形成靜態(tài)類工具。
調(diào)用方式如下：

using UnityEngine;

public class Test : MonoBehaviour
{

    void Start()
    {
        Debug.Log(DevicePerformanceUtil.GetDevicePerformanceLevel());
        //根據(jù)設(shè)備配置自動設(shè)置質(zhì)量
        DevicePerformanceUtil.ModifySettingsBasedOnPerformance();
        //手動設(shè)置質(zhì)量
        //DevicePerformanceUtil.SetQualitySettings(QualityLevel.Low);
    }
}

工具腳本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 硬件設(shè)備性能適配工具
/// </summary>
public static class DevicePerformanceUtil
{
    /// <summary>
    /// 獲取設(shè)備性能評級
    /// </summary>
    /// <returns>性能評級</returns>
    public static DevicePerformanceLevel GetDevicePerformanceLevel()
    {
        if (SystemInfo.graphicsDeviceVendorID == 32902)
        {
            //集顯
            return DevicePerformanceLevel.Low;
        }
        else //NVIDIA系列顯卡（N卡）和AMD系列顯卡
        {
            //根據(jù)目前硬件配置三個平臺設(shè)置了不一樣的評判標(biāo)準(zhǔn)（僅個人意見）
            //CPU核心數(shù)
#if UNITY_EDITOR || UNITY_STANDALONE_WIN
            if (SystemInfo.processorCount <= 2)
#elif UNITY_STANDALONE_OSX || UNITY_IPHONE
            if (SystemInfo.processorCount < 2)
#elif UNITY_ANDROID
            if (SystemInfo.processorCount <= 4)
#endif
            {
                //CPU核心數(shù)<=2判定為低端
                return DevicePerformanceLevel.Low;
            }
            else
            {
                //顯存
                int graphicsMemorySize = SystemInfo.graphicsMemorySize;
                //內(nèi)存
                int systemMemorySize = SystemInfo.systemMemorySize;
#if UNITY_EDITOR || UNITY_STANDALONE_WIN
                if (graphicsMemorySize >= 4000 && systemMemorySize >= 8000)
                    return DevicePerformanceLevel.High;
                else if (graphicsMemorySize >= 2000 && systemMemorySize >= 4000)
                    return DevicePerformanceLevel.Mid;
                else
                    return DevicePerformanceLevel.Low;
#elif UNITY_STANDALONE_OSX || UNITY_IPHONE
            if (graphicsMemorySize >= 4000 && systemMemorySize >= 8000)
                    return DevicePerformanceLevel.High;
                else if (graphicsMemorySize >= 2000 && systemMemorySize >= 4000)
                    return DevicePerformanceLevel.Mid;
                else
                    return DevicePerformanceLevel.Low;
#elif UNITY_ANDROID
            if (graphicsMemorySize >= 6000 && systemMemorySize >= 8000)
                    return DevicePerformanceLevel.High;
                else if (graphicsMemorySize >= 2000 && systemMemorySize >= 4000)
                    return DevicePerformanceLevel.Mid;
                else
                    return DevicePerformanceLevel.Low;
#endif
            }
        }
    }

    /// <summary>
    /// 根據(jù)手機(jī)性能修改項目設(shè)置
    /// </summary>
    /// <param name="lowQuality">QualitySettings中對應(yīng)Low的等級</param>
    /// <param name="midQuality">QualitySettings中對應(yīng)Mid的等級</param>
    /// <param name="highQuality">QualitySettings中對應(yīng)High的等級</param>
    public static void ModifySettingsBasedOnPerformance(int lowQuality, int midQuality, int highQuality)
    {
        DevicePerformanceLevel level = GetDevicePerformanceLevel();
        switch (level)
        {
            case DevicePerformanceLevel.Low:
                QualitySettings.SetQualityLevel(lowQuality, true);
                break;
            case DevicePerformanceLevel.Mid:
                QualitySettings.SetQualityLevel(midQuality, true);
                break;
            case DevicePerformanceLevel.High:
                QualitySettings.SetQualityLevel(highQuality, true);
                break;
        }
    }

    /// <summary>
    /// 根據(jù)機(jī)型配置自動設(shè)置質(zhì)量
    /// </summary>
    public static void ModifySettingsBasedOnPerformance()
    {
        DevicePerformanceLevel level = GetDevicePerformanceLevel();
        switch (level)
        {
            case DevicePerformanceLevel.Low:
                SetQualitySettings(QualityLevel.Low);
                break;
            case DevicePerformanceLevel.Mid:
                SetQualitySettings(QualityLevel.Mid);
                break;
            case DevicePerformanceLevel.High:
                SetQualitySettings(QualityLevel.High);
                break;
        }
    }

    /// <summary>
    /// 根據(jù)自身需要調(diào)整各級別需要修改的設(shè)置，可根據(jù)需求修改低中高三種方案某一項具體設(shè)置
    /// </summary>
    /// <param name="qualityLevel">質(zhì)量等級</param>
    public static void SetQualitySettings(QualityLevel qualityLevel)
    {
        switch (qualityLevel)
        {
            case QualityLevel.Low:
                //前向渲染使用的像素?zé)舻淖畲髷?shù)量，建議最少為1
                QualitySettings.pixelLightCount = 2;
                //你可以設(shè)置使用最大分辨率的紋理或者部分紋理（低分辨率紋理的處理開銷低）。選項有 0_完整分辨率，1_1/2分辨率，2_1/4分辨率，3_1/8分辨率
                QualitySettings.masterTextureLimit = 1;
                //設(shè)置抗鋸齒級別。選項有?? 0_不開啟抗鋸齒，2_2倍，4_4倍和8_8倍采樣。
                QualitySettings.antiAliasing = 0;
                //是否使用粒子軟融合
                QualitySettings.softParticles = false;
                //啟用實時反射探針，此設(shè)置需要用的時候再打開
                QualitySettings.realtimeReflectionProbes = false;
                //如果啟用，公告牌將面向攝像機(jī)位置而不是攝像機(jī)方向。似乎與地形系統(tǒng)有關(guān)，此處沒啥必要打開
                QualitySettings.billboardsFaceCameraPosition = false;
                //設(shè)置軟硬陰影是否打開
                QualitySettings.shadows = ShadowQuality.Disable;
                //設(shè)置垂直同步方案，VSyncs數(shù)值需要在每幀之間傳遞，使用0為不等待垂直同步。值必須是0，1或2。
                QualitySettings.vSyncCount = 0;
                break;
            case QualityLevel.Mid:
                QualitySettings.pixelLightCount = 4;
                QualitySettings.antiAliasing = 2;
                QualitySettings.softParticles = false;
                QualitySettings.realtimeReflectionProbes = true;
                QualitySettings.billboardsFaceCameraPosition = true;
                QualitySettings.shadows = ShadowQuality.HardOnly;
                QualitySettings.vSyncCount = 2;
                break;
            case QualityLevel.High:
                QualitySettings.pixelLightCount = 4;
                QualitySettings.antiAliasing = 8;
                QualitySettings.softParticles = true;
                QualitySettings.realtimeReflectionProbes = true;
                QualitySettings.billboardsFaceCameraPosition = true;
                QualitySettings.shadows = ShadowQuality.All;
                QualitySettings.vSyncCount = 2;
                break;
        }
    }
}
public enum DevicePerformanceLevel
{
    Low,
    Mid,
    High
}
public enum QualityLevel
{
    Low,
    Mid,
    High
}