using UnityEditor;
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using UnityEditor.U2D;
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using UnityEngine;
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/// <summary>
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/// 新资源导入时自动设置平台压缩格式：
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/// - 纹理(Texture2D)：Android→ETC2（有Alpha→RGBA8 / 无Alpha→RGB4） iPhone→ASTC_6x6 WebGL→ASTC_6x6
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/// - 图集(SpriteAtlas)：Android→ETC2_RGBA8 iPhone→ASTC_6x6 WebGL→ASTC_6x6
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/// - PC(Standalone)：不设置覆盖，保持默认
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///
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/// 仅处理 Assets/ResourcesOut 下的资源。
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/// </summary>
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public class TexturePlatformAssetPostprocessor : AssetPostprocessor
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{
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private static readonly string TARGET_FOLDER = TexturePlatformFormatHelper.TARGET_FOLDER;
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private static readonly bool AUTO_APPLY_ATLAS_SETTINGS = true;
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/// <summary>
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/// 防止回调中 SaveAndReimport 同步触发下一次 OnPostprocessAllAssets 造成嵌套重入。
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/// </summary>
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private static bool s_IsApplying;
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void OnPreprocessTexture()
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{
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if (!assetPath.StartsWith(TARGET_FOLDER))
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return;
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var importer = assetImporter as TextureImporter;
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if (importer == null)
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return;
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if (TexturePlatformFormatHelper.ApplyTexturePlatformSettings(importer))
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{
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Debug.Log($"[TexImport] 贴图: {assetPath}");
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}
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}
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static void OnPostprocessAllAssets(
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string[] importedAssets,
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string[] deletedAssets,
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string[] movedAssets,
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string[] movedFromAssetPaths)
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{
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if (!AUTO_APPLY_ATLAS_SETTINGS)
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return;
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// 回调里的 SaveAndReimport 会同步再次触发本回调，必须挡掉，否则会无限自触发
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if (s_IsApplying)
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return;
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s_IsApplying = true;
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try
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{
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foreach (var assetPath in importedAssets)
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{
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if (!assetPath.StartsWith(TARGET_FOLDER))
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continue;
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if (!assetPath.EndsWith(".spriteatlasv2") && !assetPath.EndsWith(".spriteatlas"))
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continue;
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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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continue;
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if (TexturePlatformFormatHelper.ApplyAtlasPlatformSettings(importer))
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{
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importer.SaveAndReimport();
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Debug.Log($"[TexImport] 图集: {assetPath}");
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}
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}
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catch (System.Exception ex)
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{
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Debug.LogError($"[TexImport] 图集失败 {assetPath}: {ex.Message}");
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}
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}
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}
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finally
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{
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s_IsApplying = false;
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}
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}
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}
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