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Unity3d批量修改纹理格式

发表于2018-08-16
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本篇文章主要给大家介绍下开发中如何批量修改纹理格式，其中决定纹理资源大小的因素主要有三种：分辨率、格式和Mipmap是否开启。

对于纹理资源的加载建议如下：
1、严格控制RGBA32和ARGB32纹理的使用，在保证视觉效果的前提下，尽可能采用“够用就好”的原则，降低纹理资源的分辨率，以及使用硬件支持的纹理格式。

2、在硬件格式（ETC、PVRTC）无法满足视觉效果时，RGBA16格式是一种较为理想的折中选择，既可以增加视觉效果，又可以保持较低的加载耗时。

3、严格检查纹理资源的Mipmap功能，特别注意UI纹理的Mipmap是否开启。有不少项目的UI纹理均开启了Mipmap功能，不仅造成了内存占用上的浪费，同时也增加了不小的加载时间。

4、ETC2对于支持OpenGL ES3.0的Android移动设备来说，是一个很好的处理半透明的纹理格式。但是，如果你的游戏需要在大量OpenGL ES2.0的设备上进行运行，那么我们不建议使用ETC2格式纹理。因为不仅会造成大量的内存占用（ETC2转成RGBA32），同时也增加一定的加载时间。下图为测试2中所用的测试纹理在三星S3和S4设备上加载性能表现。可以看出，在OpenGL ES2.0设备上，ETC2格式纹理的加载要明显高于ETC1格式，且略高于RGBA16格式纹理。因此，建议研发团队在项目中谨慎使用ETC2格式纹理。

文章 加载模块深度解析 对图片的使用格式的方法进行了详细描述

批量检测和修改纹理格式代码如下：
using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using System.IO;
public partial class ResourceExporter
｛
    static List<TextureFormatInfo> GetAllTex(bool bFilter, CheckPlatformTexFormat checkAndroid, CheckPlatformTexFormat checkIphone, ReplacePlatformTexFormat replaceAction = null)
    ｛
        List<string> texPathLs = new List<string>();
        GetAssetsTexInSubFolderForAtlas("assets", ref texPathLs);
        List<TextureFormatInfo> infoLs = new List<TextureFormatInfo>();
        int totalCount = texPathLs.Count;
        if (texPathLs.Count>0)
        ｛
            int iCurCount = 0;
            foreach (var path in texPathLs)
            ｛
                TextureImporter texImporter = TextureImporter.GetAtPath(path) as TextureImporter;
                if (null != texImporter)
                ｛
                    TextureFormatInfo texFormatInfo = new TextureFormatInfo(texImporter.assetPath);
                    texImporter.GetPlatformTextureSettings("Standalone", out texFormatInfo.windowsMaxSize, out texFormatInfo.texFormatWindows);
                    texImporter.GetPlatformTextureSettings("iPhone", out texFormatInfo.iphoneMaxSize, out texFormatInfo.texFormatIphone);
                    texImporter.GetPlatformTextureSettings("Android", out texFormatInfo.androidMaxSize, out texFormatInfo.texFormatAndroid);
                    texFormatInfo.bMipMapEnabled = texImporter.mipmapEnabled;
                    bool bAdd = true;
                    texFormatInfo.bNeedAndroidFormat = checkAndroid(texFormatInfo.texFormatAndroid);
                    texFormatInfo.bNeedIphoneFormat = checkIphone(texFormatInfo.texFormatIphone);
                    if (bFilter)
                    ｛
                        bAdd = texFormatInfo.bMipMapEnabled || (!texFormatInfo.bNeedAndroidFormat) || (!texFormatInfo.bNeedIphoneFormat);
                    ｝
                    if (bAdd)
                    ｛
                        Debug.Log(texFormatInfo.ToString());
                        if (null != replaceAction)
                        ｛
                            replaceAction(texImporter,texFormatInfo);
                        ｝
                        infoLs.Add(texFormatInfo);
                    ｝
                ｝
                EditorUtility.DisplayCancelableProgressBar("Check TexFormat", "Wait......", (++iCurCount) * 1f / totalCount);
            ｝
        ｝
        totalCount = infoLs.Count;
        Debug.Log("PathCount:" + texPathLs.Count);
        Debug.Log("InfoCount:" + infoLs.Count);
        EditorUtility.ClearProgressBar();
        return infoLs;
    ｝
    static void SaveTextureFormatInfoPath(List<TextureFormatInfo> infoLs)
    ｛
        string fileSavePath = "../AllTextureFormatInfoPath";
        int totalCount = infoLs.Count;
        using (StreamWriter sw = File.CreateText(fileSavePath + ".html"))
        ｛
            sw.WriteLine("size = " + totalCount + "</br>");
            foreach (var info in infoLs)
            ｛
                sw.WriteLine(info.ToHtmlString());
            ｝
            sw.Close();
        ｝
    ｝
    static bool CheckAndroidFormat(TextureImporterFormat format)
    ｛
        return format == TextureImporterFormat.ETC_RGB4;
    ｝
    static bool CheckIphoneFormat(TextureImporterFormat format)
    ｛
        return format.ToString().Contains("PVRTC");
    ｝
    delegate bool CheckPlatformTexFormat(TextureImporterFormat format);
    delegate void ReplacePlatformTexFormat(TextureImporter textureImporter,TextureFormatInfo texInfo);
    static void ReplacePlatformFormat(TextureImporter textureImporter, TextureFormatInfo texInfo)
    ｛
        textureImporter.mipmapEnabled = false;
        textureImporter.SetPlatformTextureSettings("Android", texInfo.androidMaxSize, TextureImporterFormat.ETC_RGB4);
        AssetDatabase.ImportAsset(textureImporter.assetPath);
    ｝
    class TextureFormatInfo
    ｛
        public string path;
        public bool bMipMapEnabled;
        public bool bNeedAndroidFormat;
        public bool bNeedIphoneFormat;
        public TextureImporterFormat texFormatIphone;
        public TextureImporterFormat texFormatAndroid;
        public TextureImporterFormat texFormatWindows;
        public int androidMaxSize;
        public int iphoneMaxSize;
        public int windowsMaxSize;
        public TextureFormatInfo(string filePath)
        ｛
            path = filePath;
        ｝
        public string ToString()
        ｛
            string strFormat = "｛0｝: MipMapEnabled:｛1｝,\nAndroid:｛2｝,\nIphone:｛3｝";
            return string.Format(strFormat, path, bMipMapEnabled, texFormatAndroid, texFormatIphone, texFormatWindows);
        ｝
        public string ToHtmlString()
        ｛
            //<font color="red"><b> size = 2357 </b></font></br>
            string strFormat = "｛0｝:   &nbsp &nbsp &nbsp&nbsp &nbsp｛1｝,    &nbsp &nbsp &nbsp &nbsp｛2｝,   &nbsp &nbsp &nbsp &nbsp ｛3｝</br>";
            string bMipStr = string.Format("MipMapEnabled:｛0｝", bMipMapEnabled);
            string parm1 = bMipMapEnabled ? GetSpecialTip(bMipStr, "red") : bMipStr;
            string androidStr = string.Format("Android:｛0｝", texFormatAndroid);
            string parm2 = !bNeedAndroidFormat ? GetSpecialTip(androidStr, "blue") : androidStr;
            string iphoneStr = string.Format("Iphone:｛0｝", texFormatIphone);
            string parm3 = !bNeedIphoneFormat ? GetSpecialTip(iphoneStr, "YellowGreen") : iphoneStr;
            return string.Format(strFormat, path, parm1, parm2, parm3);
        ｝
        private string GetSpecialTip(string name,string fontColor)
        ｛
            return string.Format("<font color=\"｛0｝\"><b>｛1｝</b></font>", fontColor, name);
        ｝
    ｝
static void GetAssetsTexInSubFolderForAtlas(string srcFolder, ref List<string> atlas)
    ｛
        string searchPattern0 = "*.png";
        string searchPattern1 = "*.tga";
        string searchPattern2 = "*.psd";
        string searchFolder = srcFolder.Replace(@"\", @"/");
        string searchDir0 = searchFolder;
        if (Directory.Exists(searchDir0))
        ｛
            //string[] files = Directory.GetFiles(searchDir0, searchPattern);
            AddFilePathToList(Directory.GetFiles(searchDir0, searchPattern0), ref atlas);
            AddFilePathToList(Directory.GetFiles(searchDir0, searchPattern1),ref atlas);
            AddFilePathToList(Directory.GetFiles(searchDir0, searchPattern2),ref atlas);
        ｝
        string[] dirs = Directory.GetDirectories(searchFolder);
        foreach (string oneDir in dirs)
        ｛
            GetAssetsTexInSubFolderForAtlas(oneDir, ref atlas);
        ｝
    ｝
    static void AddFilePathToList(string[] files, ref List<string> ls)
    ｛
        foreach (string oneFile in files)
        ｛
            string srcFile = oneFile.Replace(@"\", @"/");
            string lowerFile = srcFile.ToLower();
            ls.Add(lowerFile);
        ｝
    ｝
    [MenuItem("MyEditor/Check Texture Format")]
    public static void CheckTextureFormat()
    ｛
        List<TextureFormatInfo> infoLs = GetAllTex(true, CheckAndroidFormat, CheckIphoneFormat);
        SaveTextureFormatInfoPath(infoLs);
    ｝
    [MenuItem("MyEditor/Replace Texture Format")]
    public static void ReplaceTextureFormat()
    ｛
        GetAllTex(true, CheckAndroidFormat, CheckIphoneFormat, ReplacePlatformFormat);
        //SaveTextureFormatInfoPath(infoLs);
    ｝
｝
来自：https://blog.csdn.net/ywjun0919/article/details/51692063

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ListETC2MipmapAndroid游戏视觉PVRTC