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| 1 | +using System; |
| 2 | +using System.Collections.Generic; |
| 3 | +using System.Reflection; |
| 4 | + |
| 5 | +#if IL2CPPBEPINEX || IL2CPPMELON |
| 6 | +using System.IO; |
| 7 | +#endif |
| 8 | + |
| 9 | +using UnityEngine; |
| 10 | +using Object = UnityEngine.Object; |
| 11 | + |
| 12 | +using S1API.Logging; |
| 13 | + |
| 14 | +namespace S1API.AssetBundles |
| 15 | +{ |
| 16 | + /// <summary> |
| 17 | + /// The asset bundle manager |
| 18 | + /// </summary> |
| 19 | + public static class AssetLoader |
| 20 | + { |
| 21 | + private static readonly Log _logger = new Log("AssetLoader"); |
| 22 | + private static readonly Dictionary<string, WrappedAssetBundle> _cachedAssetBundles = new Dictionary<string, WrappedAssetBundle>(); |
| 23 | + |
| 24 | +#if IL2CPPMELON || IL2CPPBEPINEX |
| 25 | + /// <summary> |
| 26 | + /// Loads an Il2Cpp AssetBundle from an embedded resource stream by name. |
| 27 | + /// </summary> |
| 28 | + /// <param name="fullResourceName">The full embedded resource name (including namespace path).</param> |
| 29 | + /// <param name="overrideAssembly">The assembly to load the embedded resource from.</param> |
| 30 | + /// <returns>The loaded Il2CppAssetBundle, or throws on failure.</returns> |
| 31 | + public static WrappedAssetBundle GetAssetBundleFromStream(string fullResourceName, Assembly overrideAssembly) |
| 32 | + { |
| 33 | + if (_cachedAssetBundles.TryGetValue(fullResourceName, out WrappedAssetBundle cachedWrappedAssetBundle)) |
| 34 | + return cachedWrappedAssetBundle; |
| 35 | + |
| 36 | + // Attempt to find the embedded resource in the executing assembly |
| 37 | + using Stream? stream = overrideAssembly.GetManifestResourceStream(fullResourceName); |
| 38 | + if (stream == null) |
| 39 | + throw new Exception($"Embedded resource '{fullResourceName}' not found in {overrideAssembly.FullName}."); // hoping these throws will be melon/bepinex-agnostic |
| 40 | + |
| 41 | + // Read the stream into a byte array |
| 42 | + byte[] data = new byte[stream.Length]; |
| 43 | + _ = stream.Read(data, 0, data.Length); |
| 44 | + |
| 45 | + // Load the AssetBundle from memory |
| 46 | + Il2CppAssetBundle bundle = Il2CppAssetBundleManager.LoadFromMemory(data); |
| 47 | + if (bundle == null) |
| 48 | + throw new Exception($"Failed to load AssetBundle from memory: {fullResourceName}"); |
| 49 | + |
| 50 | + WrappedAssetBundle wrappedAssetBundle = new WrappedAssetBundle(bundle); |
| 51 | + _cachedAssetBundles.TryAdd(fullResourceName, wrappedAssetBundle); |
| 52 | + return wrappedAssetBundle; |
| 53 | + } |
| 54 | +#elif MONOMELON || MONOBEPINEX |
| 55 | + /// <summary> |
| 56 | + /// Load a <see cref="WrappedAssetBundle"/> instance by <see cref="string"/> resource name. |
| 57 | + /// </summary> |
| 58 | + /// <param name="fullResourceName">The full embedded resource name (including namespace path);</param> |
| 59 | + /// <param name="overrideAssembly">The assembly to load the embedded resource from.</param> |
| 60 | + /// <returns>The loaded AssetBundle instance</returns> |
| 61 | + public static WrappedAssetBundle GetAssetBundleFromStream(string fullResourceName, Assembly overrideAssembly) |
| 62 | + { |
| 63 | + // Attempt to retrieve the cached asset bundle |
| 64 | + if (_cachedAssetBundles.TryGetValue(fullResourceName, out WrappedAssetBundle cachedWrappedAssetBundle)) |
| 65 | + return cachedWrappedAssetBundle; |
| 66 | + |
| 67 | + // Attempt to find the embedded resource in the executing assembly |
| 68 | + var stream = overrideAssembly.GetManifestResourceStream(fullResourceName); |
| 69 | + |
| 70 | + WrappedAssetBundle wrappedAssetBundle = new WrappedAssetBundle(AssetBundle.LoadFromStream(stream)); |
| 71 | + _cachedAssetBundles.TryAdd(fullResourceName, wrappedAssetBundle); |
| 72 | + return wrappedAssetBundle; |
| 73 | + } |
| 74 | +#endif |
| 75 | + |
| 76 | + /// <summary> |
| 77 | + /// Loads an asset of type <typeparamref name="T"/> from an embedded AssetBundle using the executing assembly. |
| 78 | + /// </summary> |
| 79 | + /// <typeparam name="T">The type of asset to load (must derive from UnityEngine.Object).</typeparam> |
| 80 | + /// <param name="bundleName">The name of the embedded AssetBundle resource.</param> |
| 81 | + /// <param name="objectName">The name of the asset to load within the AssetBundle.</param> |
| 82 | + /// <returns>The loaded asset of type <typeparamref name="T"/>.</returns> |
| 83 | + public static T EasyLoad<T>(string bundleName, string objectName) where T : Object |
| 84 | + { |
| 85 | + return EasyLoad<T>(bundleName, objectName, Assembly.GetExecutingAssembly(), out _); |
| 86 | + } |
| 87 | + |
| 88 | + /// <summary> |
| 89 | + /// Loads an asset of type <typeparamref name="T"/> from an embedded AssetBundle using the executing assembly and outputs the loaded bundle. |
| 90 | + /// </summary> |
| 91 | + /// <typeparam name="T">The type of asset to load (must derive from UnityEngine.Object).</typeparam> |
| 92 | + /// <param name="bundleName">The name of the embedded AssetBundle resource.</param> |
| 93 | + /// <param name="objectName">The name of the asset to load within the AssetBundle.</param> |
| 94 | + /// <param name="bundle">The output parameter containing the loaded <see cref="WrappedAssetBundle"/>.</param> |
| 95 | + /// <returns>The loaded asset of type <typeparamref name="T"/>.</returns> |
| 96 | + public static T EasyLoad<T>(string bundleName, string objectName, out WrappedAssetBundle bundle) where T : Object |
| 97 | + { |
| 98 | + return EasyLoad<T>(bundleName, objectName, Assembly.GetExecutingAssembly(), out bundle); |
| 99 | + } |
| 100 | + |
| 101 | + /// <summary> |
| 102 | + /// Loads an asset of type <typeparamref name="T"/> from an embedded AssetBundle using a specified assembly. |
| 103 | + /// </summary> |
| 104 | + /// <typeparam name="T">The type of asset to load (must derive from UnityEngine.Object).</typeparam> |
| 105 | + /// <param name="bundleName">The name of the embedded AssetBundle resource.</param> |
| 106 | + /// <param name="objectName">The name of the asset to load within the AssetBundle.</param> |
| 107 | + /// <param name="assemblyOverride">The assembly from which to load the embedded AssetBundle resource.</param> |
| 108 | + /// <returns>The loaded asset of type <typeparamref name="T"/>.</returns> |
| 109 | + public static T EasyLoad<T>(string bundleName, string objectName, Assembly assemblyOverride) where T : Object |
| 110 | + { |
| 111 | + return EasyLoad<T>(bundleName, objectName, assemblyOverride, out _); |
| 112 | + } |
| 113 | + |
| 114 | + /// <summary> |
| 115 | + /// Loads an asset of type <typeparamref name="T"/> from an embedded AssetBundle using a specified assembly and outputs the loaded bundle. |
| 116 | + /// </summary> |
| 117 | + /// <typeparam name="T">The type of asset to load (must derive from UnityEngine.Object).</typeparam> |
| 118 | + /// <param name="bundleName">The name of the embedded AssetBundle resource.</param> |
| 119 | + /// <param name="objectName">The name of the asset to load within the AssetBundle.</param> |
| 120 | + /// <param name="assemblyOverride">The assembly from which to load the embedded AssetBundle resource.</param> |
| 121 | + /// <param name="bundle">The output parameter containing the loaded <see cref="WrappedAssetBundle"/>.</param> |
| 122 | + /// <returns>The loaded asset of type <typeparamref name="T"/>.</returns> |
| 123 | + public static T EasyLoad<T>(string bundleName, string objectName, Assembly assemblyOverride, out WrappedAssetBundle bundle) where T : Object |
| 124 | + { |
| 125 | + // Get the asset bundle from the assembly |
| 126 | + bundle = GetAssetBundleFromStream($"{assemblyOverride.GetName().Name}.{bundleName}", assemblyOverride); |
| 127 | + |
| 128 | + // Load the asset from the bundle |
| 129 | + return bundle.LoadAsset<T>(objectName); |
| 130 | + } |
| 131 | + } |
| 132 | +} |
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