using UnityEditor;
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using UnityEditor.U2D;
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using UnityEngine;
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using System.Collections.Generic;
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/// <summary>
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/// 批量将所有贴图和图集的 WebGL 平台格式改为 ETC2 压缩。
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/// 根据原始格式自动判断是否需要 Alpha 通道：
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/// - 有 Alpha → ETC2_RGBA8
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/// - 无 Alpha → ETC2_RGB4
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///
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/// 使用菜单：程序/Sprite/WebGL贴图转ETC2
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/// </summary>
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public class ConvertWebGLTextureToETC2
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{
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[MenuItem("程序/Sprite/WebGL贴图转ETC2(全部)")]
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public static void ConvertAll()
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{
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ConvertTextures();
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ConvertSpriteAtlases();
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AssetDatabase.SaveAssets();
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AssetDatabase.Refresh();
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}
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[MenuItem("程序/Sprite/WebGL贴图转ETC2(仅贴图)")]
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public static void ConvertTexturesOnly()
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{
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ConvertTextures();
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AssetDatabase.SaveAssets();
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AssetDatabase.Refresh();
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}
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[MenuItem("程序/Sprite/WebGL贴图转ETC2(仅图集)")]
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public static void ConvertAtlasesOnly()
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{
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ConvertSpriteAtlases();
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AssetDatabase.SaveAssets();
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AssetDatabase.Refresh();
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}
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static void ConvertTextures()
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{
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var guids = AssetDatabase.FindAssets("t:Texture2D", new[] { "Assets/ResourcesOut" });
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int total = guids.Length;
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int converted = 0;
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int skipped = 0;
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for (int i = 0; i < total; i++)
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{
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var assetPath = AssetDatabase.GUIDToAssetPath(guids[i]);
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EditorUtility.DisplayProgressBar("WebGL贴图转ETC2", $"[{i + 1}/{total}] {assetPath}", (float)i / total);
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var importer = AssetImporter.GetAtPath(assetPath) as TextureImporter;
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if (importer == null)
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{
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skipped++;
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continue;
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}
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bool needsAlpha = NeedsAlpha(importer);
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var targetFormat = needsAlpha ? TextureImporterFormat.ETC2_RGBA8 : TextureImporterFormat.ETC2_RGB4;
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var webGLSettings = importer.GetPlatformTextureSettings("WebGL");
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// 已经是目标格式则跳过
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if (webGLSettings.overridden && webGLSettings.format == targetFormat)
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{
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skipped++;
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continue;
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}
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webGLSettings.overridden = true;
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webGLSettings.maxTextureSize = GetMaxTextureSize(importer);
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webGLSettings.textureCompression = TextureImporterCompression.Compressed;
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webGLSettings.format = targetFormat;
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webGLSettings.compressionQuality = 50;
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importer.SetPlatformTextureSettings(webGLSettings);
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importer.SaveAndReimport();
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converted++;
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Debug.Log($"[ETC2] 贴图 {(needsAlpha ? "RGBA8" : "RGB4")}: {assetPath}");
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}
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EditorUtility.ClearProgressBar();
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Debug.Log($"[ETC2] 贴图处理完成：转换 {converted}，跳过 {skipped}，共 {total}");
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EditorUtility.DisplayDialog("贴图转换完成",
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$"转换 {converted} 个，跳过 {skipped} 个，共 {total} 个贴图。",
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"OK");
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}
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static void ConvertSpriteAtlases()
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{
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var guids = AssetDatabase.FindAssets("t:SpriteAtlas", new[] { "Assets/ResourcesOut" });
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int total = guids.Length;
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int converted = 0;
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int skipped = 0;
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for (int i = 0; i < total; i++)
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{
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var assetPath = AssetDatabase.GUIDToAssetPath(guids[i]);
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EditorUtility.DisplayProgressBar("WebGL图集转ETC2", $"[{i + 1}/{total}] {assetPath}", (float)i / total);
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try
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{
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var importer = SpriteAtlasImporter.GetAtPath(assetPath) as SpriteAtlasImporter;
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if (importer == null)
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{
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skipped++;
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continue;
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}
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var webGLSettings = importer.GetPlatformSettings("WebGL");
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// 判断 Alpha：检查其他平台的设置来推断
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bool needsAlpha = AtlasNeedsAlpha(importer);
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var targetFormat = needsAlpha ? TextureImporterFormat.ETC2_RGBA8 : TextureImporterFormat.ETC2_RGB4;
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if (webGLSettings.overridden && webGLSettings.format == targetFormat)
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{
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skipped++;
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continue;
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}
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webGLSettings.overridden = true;
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webGLSettings.maxTextureSize = 2048;
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webGLSettings.textureCompression = TextureImporterCompression.Compressed;
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webGLSettings.format = targetFormat;
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webGLSettings.compressionQuality = 50;
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importer.SetPlatformSettings(webGLSettings);
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importer.SaveAndReimport();
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converted++;
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Debug.Log($"[ETC2] 图集 {(needsAlpha ? "RGBA8" : "RGB4")}: {assetPath}");
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}
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catch (System.Exception ex)
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{
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Debug.LogError($"[ETC2] 图集处理失败 {assetPath}: {ex.Message}");
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}
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}
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EditorUtility.ClearProgressBar();
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Debug.Log($"[ETC2] 图集处理完成：转换 {converted}，跳过 {skipped}，共 {total}");
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EditorUtility.DisplayDialog("图集转换完成",
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$"转换 {converted} 个，跳过 {skipped} 个，共 {total} 个图集。",
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"OK");
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}
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/// <summary>
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/// 判断贴图是否需要 Alpha 通道
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/// </summary>
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static bool NeedsAlpha(TextureImporter importer)
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{
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// 1. 检查贴图本身是否含 Alpha
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if (importer.DoesSourceTextureHaveAlpha())
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return true;
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// 2. 检查已有平台设置的格式来推断
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foreach (var platform in new[] { "Android", "iPhone", "Standalone" })
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{
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var settings = importer.GetPlatformTextureSettings(platform);
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if (settings.overridden && IsAlphaFormat(settings.format))
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return true;
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}
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// 3. 检查 alphaSource 设置
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if (importer.alphaSource != TextureImporterAlphaSource.None)
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return importer.DoesSourceTextureHaveAlpha();
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return false;
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}
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/// <summary>
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/// 判断图集是否需要 Alpha（通过检查其他平台的格式推断）
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/// </summary>
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static bool AtlasNeedsAlpha(SpriteAtlasImporter importer)
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{
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foreach (var platform in new[] { "Android", "iPhone", "Standalone" })
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{
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var settings = importer.GetPlatformSettings(platform);
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if (settings.overridden && IsAlphaFormat(settings.format))
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return true;
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}
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// 图集默认认为需要 Alpha（UI 图集大多有透明）
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return true;
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}
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/// <summary>
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/// 判断格式是否包含 Alpha 通道
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/// </summary>
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static bool IsAlphaFormat(TextureImporterFormat format)
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{
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switch (format)
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{
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case TextureImporterFormat.RGBA32:
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case TextureImporterFormat.RGBA16:
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case TextureImporterFormat.ARGB32:
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case TextureImporterFormat.ARGB16:
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case TextureImporterFormat.DXT5:
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case TextureImporterFormat.ETC2_RGBA8:
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case TextureImporterFormat.ASTC_4x4:
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case TextureImporterFormat.ASTC_5x5:
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case TextureImporterFormat.ASTC_6x6:
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case TextureImporterFormat.ASTC_8x8:
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case TextureImporterFormat.ASTC_10x10:
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case TextureImporterFormat.ASTC_12x12:
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case TextureImporterFormat.PVRTC_RGBA2:
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case TextureImporterFormat.PVRTC_RGBA4:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// 获取已有的最大贴图尺寸设置
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/// </summary>
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static int GetMaxTextureSize(TextureImporter importer)
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{
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foreach (var platform in new[] { "Android", "iPhone", "Standalone" })
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{
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var settings = importer.GetPlatformTextureSettings(platform);
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if (settings.overridden)
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return settings.maxTextureSize;
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}
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return importer.maxTextureSize;
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}
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}
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