Expose resources to skin via interface (and share common pieces with beatmap)

osu.Game/IO/IStorageResourceProvider.cs

@@ -0,0 +1,29 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Audio;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.IO.Stores;
+
+namespace osu.Game.IO
+{
+    public interface IStorageResourceProvider
+    {
+        /// <summary>
+        /// Retrieve the game-wide audio manager.
+        /// </summary>
+        AudioManager AudioManager { get; }
+
+        /// <summary>
+        /// Access game-wide user files.
+        /// </summary>
+        IResourceStore<byte[]> Files { get; }
+
+        /// <summary>
+        /// Create a texture loader store based on an underlying data store.
+        /// </summary>
+        /// <param name="underlyingStore">The underlying provider of texture data (in arbitrary image formats).</param>
+        /// <returns>A texture loader store.</returns>
+        IResourceStore<TextureUpload> CreateTextureLoaderStore(IResourceStore<byte[]> underlyingStore);
+    }
+}