Unity3D教程：如何使用NGUI分离RGBA通道
发表于2017-02-13
如何使用NGUI分离RGBA通道？这就需要借助一些工具脚本来实现，可能有些开发者没有这方面的经验，为了帮助大家，下面就给大家介绍下使用NGUI分离RGBA通道的方法，一起来看看吧。
一、拆分图片通道
下面是代码实现：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | 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 /// /// 分离图片通道 /// /// 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 file if (!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); } /// /// 设置图片为可读格式 /// /// 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 }); } /// /// 设置图片格式 /// 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 /// /// 获得相对路径 /// /// /// static string GetRelativeAssetPath(string _fullPath) { _fullPath = GetRightFormatPath(_fullPath); int idx = _fullPath.IndexOf("Assets"); string assetRelativePath = _fullPath.Substring(idx); return assetRelativePath; } /// /// 转换斜杠 /// /// /// static string GetRightFormatPath(string _path) { return _path.Replace("\", "/"); } /// /// 获取文件后缀 /// /// /// 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\"); } /// /// 是否为图片 /// /// /// 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"); } /// /// 是否为自动生成的ETC图片 /// /// /// 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 } |
二、专用的shader
其间夹杂了R通道为0时，自动置灰的shader功能。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | Shader "Unlit/Transparent Colored ETC1" { Properties { _MainTex ("Base (RGB)", 2D) = "black" {} _MainTex_A ("Alpha (A)", 2D) = "white" {} } SubShader { LOD 200 Tags { "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" } Pass { Cull Off Lighting Off ZWrite Off Fog { Mode Off } Offset -1, -1 Blend SrcAlpha OneMinusSrcAlpha CGPROGRAM #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 100 Tags { "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" } Pass { Cull Off Lighting Off ZWrite Off Fog { Mode Off } Offset -1, -1 ColorMask RGB Blend SrcAlpha OneMinusSrcAlpha ColorMaterial AmbientAndDiffuse SetTexture [_MainTex] { Combine Texture * Primary } } } } |
另外分别复制Unlit - Transparent Colored 1、2、3，分别创建 Unlit - Transparent Colored ETC1 1、2、3。并逐一添加A贴图，并读取A贴图的r通道。
UIPanel的拓展
将图集的shader改为ETC1shader后，运行发现，UIPanel选择clipping模式后shader还原了。
解决方案：
UIDrawCall脚本里，找到CreateMaterial()方法修改此处
