[Build] 빌드 시, Builtin 되는 AssetBundle 중 현재 Platform의 AssetBundle만 빌트인 되도록 하기

[수정] Rename 방식으로 변경(2024-07-04]

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[빌드 시, Builtin AssetBundles에서 해당 Platform 에셋번들만 빌드 되도록 하기 위한 PreProcessor 추가]

기본적으로 에셋번들은 플랫폼 별로 모두 가지고 있는데 해당 플랫폼에 맞는 에셋번들만 빌드 되도록 하기 위해서

빌드 전(Preprocessor) 해당 안되는 AssetBundle을 Hidden 폴더(예:.Android or .iOS)로 Rename 했다가, 빌드 후(Postprocessor) 되돌려 놓음.

 

using System;
using UnityEngine;
using UnityEditor;
using UnityEditor.Build;
using System.IO;
#if UNITY_2018_1_OR_NEWER
using UnityEditor.Build.Reporting;
#endif
using UnityEditor.Callbacks;

namespace blueasa
{
    /// <summary>
    /// 빌드 시, Built-in AssetBundle에서 해당 Platform AssetBundle만 빌드 되도록 하기 위한 Preprocessor
    /// 빌드 전(Preprocessor) 해당 안되는 AssetBundle을 Hidden 폴더(예:.Android or .iOS)로 Rename 했다가, 빌드 후(Postprocessor) 되돌려 놓음
    /// [Hidden(./~) 참조] https://docs.unity3d.com/kr/2021.3/Manual/SpecialFolders.html
    /// </summary>
#if UNITY_2018_1_OR_NEWER
    public class BuildPreprocessor_BuiltinAssetBundle : IPreprocessBuildWithReport, IPostprocessBuildWithReport
#else
    public class BuildPreprocessor_BuiltinAssetBundle : IPreprocessBuild, IPostprocessBuild
#endif
    {
        private static readonly string m_strAndroid = "Android";
        private static readonly string m_strDotAndroid = ".Android";
        private static readonly string m_striOS = "iOS";
        private static readonly string m_strDotiOS = ".iOS";
        private static readonly string m_strDotMeta = ".meta";
        private static readonly string m_strAssetBundles = "AssetBundles";

        private static readonly string m_strDataPath = Application.dataPath;
        private static readonly string m_strStreamingAssetsPath = Application.streamingAssetsPath;
        
        private static readonly string m_strAssetBundlesPath_Builtin_FullPath = string.Format("{0}/{1}", m_strStreamingAssetsPath, m_strAssetBundles);
        private static readonly string m_strAssetBundlesPath_Builtin_Android_FullPath = string.Format("{0}/{1}", m_strAssetBundlesPath_Builtin_FullPath, m_strAndroid);
        private static readonly string m_strAssetBundlesPath_Builtin_DotAndroid_FullPath = string.Format("{0}/{1}", m_strAssetBundlesPath_Builtin_FullPath, m_strDotAndroid);
        private static readonly string m_strAssetBundlesPath_Builtin_iOS_FullPath = string.Format("{0}/{1}", m_strAssetBundlesPath_Builtin_FullPath, m_striOS);
        private static readonly string m_strAssetBundlesPath_Builtin_DotiOS_FullPath = string.Format("{0}/{1}", m_strAssetBundlesPath_Builtin_FullPath, m_strDotiOS);

        public int callbackOrder { get { return 0; } }

        private static void Refresh()
        {
            System.Threading.Thread.Sleep(100);
            AssetDatabase.Refresh();
            System.Threading.Thread.Sleep(100);
        }

#if UNITY_2018_1_OR_NEWER
        public void OnPreprocessBuild(BuildReport report)
#else
        public void OnPreprocessBuild(BuildTarget target, string path)
#endif
        {
            Debug.LogWarning($"[OnPreprocessBuild] {this}");

            // 빌드 전, 다른 플랫폼 AssetBundle 폴더 임시 제외
#if UNITY_ANDROID
            // [Rename]
            if (true == Directory.Exists(m_strAssetBundlesPath_Builtin_iOS_FullPath)
                && false == Directory.Exists(m_strAssetBundlesPath_Builtin_DotiOS_FullPath))
            {
                Debug.LogWarning("[OnPreprocessBuild] Rename 'iOS' Folder to '.iOS'");
                Directory.Move(m_strAssetBundlesPath_Builtin_iOS_FullPath, m_strAssetBundlesPath_Builtin_DotiOS_FullPath);
                // 빈(Empty) 폴더 생성을 방지하기 위해서 폴더의 meta 파일도 함께 삭제
                if (true == File.Exists(m_strAssetBundlesPath_Builtin_iOS_FullPath + m_strDotMeta))
                {
                    File.Delete(m_strAssetBundlesPath_Builtin_iOS_FullPath + m_strDotMeta);
                }
                Refresh();
            }
#elif UNITY_IOS
            // [Rename]
            if (true == Directory.Exists(m_strAssetBundlesPath_Builtin_Android_FullPath)
                && false == Directory.Exists(m_strAssetBundlesPath_Builtin_DotAndroid_FullPath))
            {
                Debug.LogWarning("[OnPreprocessBuild] Rename 'Android' Folder to '.Android'");
                Directory.Move(m_strAssetBundlesPath_Builtin_Android_FullPath, m_strAssetBundlesPath_Builtin_DotAndroid_FullPath);
                // 빈(Empty) 폴더 생성을 방지하기 위해서 폴더의 meta 파일도 함께 삭제
                if (true == File.Exists(m_strAssetBundlesPath_Builtin_Android_FullPath + m_strDotMeta))
                {
                    File.Delete(m_strAssetBundlesPath_Builtin_Android_FullPath + m_strDotMeta);
                }
                Refresh();
            }
#endif
            // Start listening for errors when build starts
            Application.logMessageReceived += OnBuildError;
        }

        // CALLED DURING BUILD TO CHECK FOR ERRORS
        private void OnBuildError(string condition, string stacktrace, LogType type)
        {
            Debug.LogWarning($"[OnBuildError] {condition} {stacktrace} {type}");

            if (type == LogType.Error)
            {
                // FAILED TO BUILD, STOP LISTENING FOR ERRORS
                Application.logMessageReceived -= OnBuildError;

                // 빌드 에러 시에도 이동된 파일 되돌리기
                RestoreTemporarilyMovedAssetbundles();
            }
        }

#if UNITY_2018_1_OR_NEWER
        public void OnPostprocessBuild(BuildReport report)
#else
        public void OnPostprocessBuild(BuildTarget target, string path)
#endif
        {
            Debug.LogWarning($"[OnPostprocessBuild] {this}");

            // [빌드 후] 제외 됐던 다른 플랫폼 AssetBundle 폴더 되돌리기
            RestoreTemporarilyMovedAssetbundles();

            // IF BUILD FINISHED AND SUCCEEDED, STOP LOOKING FOR ERRORS
            Application.logMessageReceived -= OnBuildError;
        }

        public static void RestoreTemporarilyMovedAssetbundles()
        {
            Debug.LogWarning($"[RestoreTemporarilyMovedAssetbundles]");

            // [빌드 후] 제외 됐던 다른 플랫폼 AssetBundle 폴더 되돌리기
#if UNITY_ANDROID
            // [Rename]
            if (true == Directory.Exists(m_strAssetBundlesPath_Builtin_DotiOS_FullPath)
                && false == Directory.Exists(m_strAssetBundlesPath_Builtin_iOS_FullPath))
            {
                Debug.LogWarning("[OnPreprocessBuild] Rename '.iOS' Folder to 'iOS'");
                Directory.Move(m_strAssetBundlesPath_Builtin_DotiOS_FullPath, m_strAssetBundlesPath_Builtin_iOS_FullPath);
                Refresh();
            }
#elif UNITY_IOS
            // [Rename]
            if (true == Directory.Exists(m_strAssetBundlesPath_Builtin_DotAndroid_FullPath)
                && false == Directory.Exists(m_strAssetBundlesPath_Builtin_Android_FullPath))
            {
                Debug.LogWarning("[OnPreprocessBuild] Rename '.Android' Folder to 'Android'");
                Directory.Move(m_strAssetBundlesPath_Builtin_DotAndroid_FullPath, m_strAssetBundlesPath_Builtin_Android_FullPath);
                Refresh();
            }
#endif
        }
    }
}