scene

type Asset struct {
	CursorSprites           [3]draws.Sprite
	DefaultBackgroundSprite draws.Sprite
	BoxMaskSprite           draws.Sprite
	ClearSprite             draws.Sprite
	IntroSprite             draws.Sprite
	LoadingSprite           draws.Sprite
	SearchBoxSprite         draws.Sprite

	EnterSound       audios.SoundPlayer
	SwipeSoundPod    audios.SoundPlayer
	TapSoundPod      audios.SoundPlayer
	ToggleSounds     [2]audios.SoundPlayer
	TransitionSounds [2]audios.SoundPlayer

	// Each key count has different asset in piano mode.
	PianoAssets map[int]*piano.Asset
}

type Config struct {
	MusicRoots []string
	ScreenSize draws.Vector2

	MusicVolume          float64
	SoundVolume          float64
	MusicOffset          int32
	BackgroundBrightness float64
	DebugPrint           bool
	Replay               bool

	CursorSpriteScale   float64
	ChartTreeNodeWidth  float64
	ChartTreeNodeHeight float64
	ChartTreeNodeShrink float64 // Nodes are not focused will be shrinked.
	SearchBoxWidth      float64
	SearchBoxHeight     float64
	ClearSpriteScale    float64

	Mode        int
	SubMode     int
	PianoConfig *piano.Config
}

type PlayArgs struct {
	MusicFS       fs.FS
	ChartFilename string
	Replay        *osr.Format
}

type Scene interface {
	Update() any
	Draw(screen draws.Image)
}