Layered scene data.

• renderSettings is passed to REGL.Common.group when viewing all layers.
• commonData is shared by all layers in the scene.
• layers stores the scene's abstract layers.

Here is an example for it:

{ renderSettings = []
, commonData = cd
, layers =
    [ Main.layer (MainInitData { components = comps, fakeBricks = fakes, isBoss = isBoss }) envcd
    , TechTree.layer NullLayerMsg envcd
    , TextLayer.layer (TextInitData levelName) envcd
    , PauseLayer.layer NullLayerMsg envcd
    , Guide.layer NullLayerMsg envcd
    ]
}

Generate scene storage for a layered scene.

• init creates the initial layered scene data.

• settingsFunc updates renderSettings each time the scene updates. If you do not need dynamic effects, provide \_ _ data -> data.renderSettings.

Init type for normal (not prototype) layered scenes.

It receives the environment and optional scene message, then returns the initial LayeredSceneData.

   { renderSettings = []
    , commonData = cd
    , layers =
        [ Opening.layer NullLayerMsg envcd ]
    }

Effect function type for layered scenes.

It runs during scene update and returns render effects used when all layers are grouped.

Prototype init type for layered scene prototypes.

It receives the environment and prototype initialization data, then returns LayeredSceneData.

Level init type for layered scene prototypes.

This converts a normal scene message into prototype initialization data.

Compose prototype init with level init.