XnaFiddle: Skill for Claude Code

File Loading

XnaFiddle has no disk or traditional content pipeline. All assets live in memory and are loaded through InMemoryContentManager, a custom ContentManager subclass that serves files from a static Dictionary<string, byte[]>.

Four entry paths, one destination

Source	Mechanism	Ends up in	SourceUrl set?
Example assets	Embedded resources in the assembly, loaded by ExampleGallery.LoadAssets()	RegisterContentFile()	Yes — points to wwwroot/examples/{ExampleName}/{file}
URL-fetched assets	FetchAndAddAssetUrl(url) via &assets= share param or URL input	RegisterContentFile()	Yes — the fetched URL
User drag-and-drop	JS fileDropInterop -> OnFileDropped JSInvokable	RegisterContentFile()	No — cannot be re-fetched
Gist import	LoadFromGistId: each gist file whose ext is in SupportedAssetExtensions is base64-decoded by DecodeGistAssetAsync (fetches raw_url when truncated) and registered via RegisterGistAsset	RegisterContentFile()	No (issue #82)

All four paths converge on RegisterContentFile(fileName, bytes) in Index.razor.cs, which does two things:

1. InMemoryContentManager.AddFile(fileName, bytes) — stores data under the original filename AND the extension-stripped name (so Content.Load<Texture2D>("KniIcon") works without knowing the extension)
2. contentFileCache.register(fileName, base64) via JS interop — registers the file in the JS-side XHR cache so TitleContainer.OpenStream() can resolve it (see below)

Supported formats

Controlled by SupportedAssetExtensions in Index.razor.cs:

• .png — loaded as Texture2D via Texture2D.FromStream()
• .wav — loaded as SoundEffect via SoundEffect.FromStream()
• .fnt — BMFont text format; stored as raw bytes. The UI parses page lines to show which texture files the font references (so users know what companion .png files to also drop)
• .ttf — TrueType font; stored as raw bytes for FontStashSharp
• .ember — stored as raw bytes
• .tmx .tsx .world .ldtk .ogmo .json .txt .xml — text/data formats (tilemap & level-editor files plus generic data); stored as raw bytes and read by user code via TitleContainer.OpenStream (no Load<T> branch)