This PR introduces a deserialize method to GL2D, adding initial support for parsing and deserializing spritesheets within the GL2D format.

Details

• Implements the core concept of deserializing GL2D files.
• The approach mirrors the Assets system, where each node and resource can register its own parser.
  • Currently implemented container and sprite
• Updates the GL2D spec to include a spritesheet source.
  • A texture.source can now reference either:
    • an texture source (such as an image), or
    • a spritesheet.
  • Spritesheets, in turn, point to the image source they require.

Example:

stackblitz demo

• https://stackblitz.com/edit/fqisbvc7?file=src%2Findex.js

serialize / deserialize scene

const serializedScene = await GL2D.serialize(app.stage);
const deserializedScene = await GL2D.deserialize(app.stage);

app.stage.addChild(deserializedScene);

serialized output

[
  {
    "type": "texture",
    "source": 2,
    "frame": [0, 0, 64, 64]
  },
  {
    "type": "image_source",
    "uri": "/textures/spritesheet.png"
  },
  {
    "type": "spritesheet",
    "uri": "/textures/spritesheet.json",
    "source": 1
  }
]

In this example:
texture → spritesheet → image source (following the source chain).

Notes

• Not all engines require a dedicated spritesheet resource; some may directly load the image source instead.
• In this PR currently only Container and Sprite have deserialize parsers