public class DuanTools_ETC1SeperateRGBA
{static string getPath_NGUIAtlas(){return Application.dataPath + "/Atlas-3";}[MenuItem("DuanTools/ETC1分离RGBA/分离NGUI图片通道")]static void SeperateNGUI_TexturesRGBandAlphaChannel(){Debug.Log("分离Alpha通道 Start.");  string[] paths = Directory.GetFiles(getPath_NGUIAtlas(), "*.*", SearchOption.AllDirectories);foreach (string path in paths){if (!string.IsNullOrEmpty(path) && !IsIgnorePath(path) && IsTextureFile(path) && !IsTextureConverted(path))   //full name{//Debug.Log("path:" + path);SeperateRGBAandlphaChannel(path);}}AssetDatabase.Refresh();ReImportAsset();Debug.Log("分离Alpha通道 Finish.");  }[MenuItem("DuanTools/ETC1分离RGBA/改变NGUI材质")]static void ChangeNGUI_MaterialtoETC1(){//CalculateTexturesAlphaChannelDic();string[] matpaths = Directory.GetFiles(getPath_NGUIAtlas(), "*.mat", SearchOption.AllDirectories);foreach (string matpath in matpaths){string propermatpath = GetRelativeAssetPath(matpath);Material mat = (Material)AssetDatabase.LoadAssetAtPath(propermatpath, typeof(Material));if (mat != null){ChangMaterial(mat, getPath_NGUIAtlas());/*string[] alphatexpaths = GetMaterialTexturesHavingAlphaChannel(mat);if (alphatexpaths.Length == 0){continue;}Debug.Log("Material having texture(s) with Alpha channel : " + propermatpath);foreach (string alphatexpath in alphatexpaths){Debug.Log(alphatexpath + " in " + propermatpath);}*/}else{Debug.LogError("Load material failed : " + matpath);}}Debug.Log("材质改变完成 Finish!");  }#region 分离 RGB & A/// <summary>/// 分离图片通道/// </summary>/// <param name="_texPath"></param>static void SeperateRGBAandlphaChannel(string _texPath){//获得相对路径string assetRelativePath = GetRelativeAssetPath(_texPath);SetTextureReadable(assetRelativePath);Texture2D sourcetex = AssetDatabase.LoadAssetAtPath(assetRelativePath, typeof(Texture2D)) as Texture2D;  //not just the textures under Resources fileif (!sourcetex){Debug.Log("读取图片失败 : " + assetRelativePath);return;}/*进化版本*/Color[] colors = sourcetex.GetPixels();Texture2D rgbTex2 = new Texture2D(sourcetex.width, sourcetex.height, TextureFormat.RGB24, false);rgbTex2.SetPixels(colors);rgbTex2.Apply();string strPath_RGB = GetRGBTexPath(_texPath);File.WriteAllBytes(strPath_RGB, rgbTex2.EncodeToPNG());ReImport_Addlist(strPath_RGB, rgbTex2.width, rgbTex2.height);Texture2D alphaTex2 = new Texture2D(sourcetex.width , sourcetex.height, TextureFormat.RGB24, false);Color[] alphacolors = new Color[colors.Length];for (int i = 0; i < colors.Length; ++i){alphacolors[i].r = colors[i].a;alphacolors[i].g = colors[i].a;alphacolors[i].b = colors[i].a;}alphaTex2.SetPixels(alphacolors);alphaTex2.Apply();string strPath_Alpha = GetAlphaTexPath(_texPath);File.WriteAllBytes(strPath_Alpha, alphaTex2.EncodeToPNG());ReImport_Addlist(strPath_Alpha, alphaTex2.width, alphaTex2.height); }/// <summary>/// 设置图片为可读格式/// </summary>/// <param name="_relativeAssetPath"></param>static void SetTextureReadable(string _relativeAssetPath){string postfix = GetFilePostfix(_relativeAssetPath);if (postfix == ".dds")    // no need to set .dds file.  Using TextureImporter to .dds file would get casting type error.{return;}TextureImporter ti = (TextureImporter)TextureImporter.GetAtPath(_relativeAssetPath);ti.isReadable = true;AssetDatabase.ImportAsset(_relativeAssetPath);}static Dictionary<string, int[]> ReImportList = new Dictionary<string, int[]>();static void ReImport_Addlist(string path, int width, int height){ReImportList.Add(path, new int[] { width, height });}/// <summary>/// 设置图片格式/// </summary>static void ReImportAsset(){foreach (var item in ReImportList){TextureImporter importer = null;string assetpath = GetRelativeAssetPath(item.Key);try{importer = (TextureImporter)TextureImporter.GetAtPath(assetpath);}catch{Debug.LogError("Load Texture failed: " + assetpath);return;}if (importer == null){Debug.Log("importer null:" + assetpath);return;}importer.textureType = TextureImporterType.Advanced;importer.isReadable = false;  //increase memory cost if readable is true  importer.mipmapEnabled = false;importer.wrapMode = TextureWrapMode.Clamp;importer.anisoLevel = 1;importer.maxTextureSize = Mathf.Max(item.Value[0], item.Value[1]);importer.textureFormat = TextureImporterFormat.ETC_RGB4;importer.compressionQuality = 50;//if (path.Contains("/UI/"))//{//    importer.textureType = TextureImporterType.GUI;//}AssetDatabase.ImportAsset(item.Key);}}#endregion#region 材质static void ChangMaterial(Material _mat,string _texPath){Shader shader;switch (_mat.shader.name){case "Unlit/Transparent Colored":{shader = Shader.Find("Unlit/Transparent Colored ETC1");}break;default: return;}string[] mainPath = Directory.GetFiles(_texPath, _mat.mainTexture.name + "_ETC_RGB.png", SearchOption.AllDirectories);Texture mainTex = AssetDatabase.LoadAssetAtPath(GetRelativeAssetPath(mainPath[0]), typeof(Texture)) as Texture;string[] alphaPath = Directory.GetFiles(_texPath, _mat.mainTexture.name + "_ETC_Alpha.png", SearchOption.AllDirectories);Texture alphaTex = AssetDatabase.LoadAssetAtPath(GetRelativeAssetPath(alphaPath[0]), typeof(Texture)) as Texture;_mat.shader = shader;_mat.SetTexture("_MainTex", mainTex);_mat.SetTexture("_MainTex_A", alphaTex);}#endregion #region Path or 后缀/// <summary>/// 获得相对路径/// </summary>/// <param name="_fullPath"></param>/// <returns></returns>static string GetRelativeAssetPath(string _fullPath){_fullPath = GetRightFormatPath(_fullPath);int idx = _fullPath.IndexOf("Assets");string assetRelativePath = _fullPath.Substring(idx);return assetRelativePath;}/// <summary>/// 转换斜杠/// </summary>/// <param name="_path"></param>/// <returns></returns>static string GetRightFormatPath(string _path){return _path.Replace("\\", "/");}/// <summary>/// 获取文件后缀/// </summary>/// <param name="_filepath"></param>/// <returns></returns>static string GetFilePostfix(string _filepath)   //including '.' eg ".tga", ".dds"{string postfix = "";int idx = _filepath.LastIndexOf('.');if (idx > 0 && idx < _filepath.Length)postfix = _filepath.Substring(idx, _filepath.Length - idx);return postfix;}static bool IsIgnorePath(string _path){return _path.Contains("\\UI\\");}/// <summary>/// 是否为图片/// </summary>/// <param name="_path"></param>/// <returns></returns>static bool IsTextureFile(string _path){string path = _path.ToLower();return path.EndsWith(".psd") || path.EndsWith(".tga") || path.EndsWith(".png") || path.EndsWith(".jpg") || path.EndsWith(".dds") || path.EndsWith(".bmp") || path.EndsWith(".tif") || path.EndsWith(".gif");}/// <summary>/// 是否为自动生成的ETC图片/// </summary>/// <param name="_path"></param>/// <returns></returns>static bool IsTextureConverted(string _path){return _path.Contains("_ETC_RGB.") || _path.Contains("_ETC_Alpha.");}  static string GetRGBTexPath(string _texPath){return GetTexPath(_texPath, "_ETC_RGB.");}static string GetAlphaTexPath(string _texPath){return GetTexPath(_texPath, "_ETC_Alpha.");}static string GetTexPath(string _texPath, string _texRole){string result = _texPath.Replace(".", _texRole);string postfix = GetFilePostfix(_texPath);return result.Replace(postfix, ".png");}#endregion
}

Shader "Unlit/Transparent Colored ETC1"
{Properties{_MainTex ("Base (RGB)", 2D) = "black" {}_MainTex_A ("Alpha (A)", 2D) = "white" {}}SubShader{LOD 200Tags{"Queue" = "Transparent""IgnoreProjector" = "True""RenderType" = "Transparent"}Pass{Cull OffLighting OffZWrite OffFog { Mode Off }Offset -1, -1Blend SrcAlpha OneMinusSrcAlphaCGPROGRAM#pragma vertex vert#pragma fragment frag         #include "UnityCG.cginc"sampler2D _MainTex;sampler2D _MainTex_A;float4 _MainTex_ST;struct appdata_t{float4 vertex : POSITION;float2 texcoord : TEXCOORD0;fixed4 color : COLOR;};struct v2f{float4 vertex : SV_POSITION;half2 texcoord : TEXCOORD0;fixed4 color : COLOR;};v2f o;v2f vert (appdata_t v){o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);o.texcoord = v.texcoord;o.color = v.color;return o;}fixed4 frag (v2f IN) : COLOR{fixed4 col;col.rgb = tex2D(_MainTex, IN.texcoord).rgb;col.a = tex2D(_MainTex_A, IN.texcoord).b;if (IN.color.r < 0.001 && IN.color.g > 0.001 && IN.color.b > 0.001)  {  float grey = dot(col.rgb, float3(0.299, 0.587, 0.114));  col.rgb = float3(grey, grey, grey);  }  else  col = col * IN.color;return col;}ENDCG}}SubShader{LOD 100Tags{"Queue" = "Transparent""IgnoreProjector" = "True""RenderType" = "Transparent"}Pass{Cull OffLighting OffZWrite OffFog { Mode Off }Offset -1, -1ColorMask RGBBlend SrcAlpha OneMinusSrcAlphaColorMaterial AmbientAndDiffuseSetTexture [_MainTex]{Combine Texture * Primary}}}
}