move AssetFS into Game

engine/asset.go

@@ -4,16 +4,12 @@ import (
 	"compress/gzip"
 	"encoding/gob"
 	"image"
-	"io/fs"
 	"log"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
 var (
-	// Assets (usually embed.FS)
-	AssetFS fs.FS
-
 	// AnimDefs are easier to write as Go expressions -
 	// so just set this.
 	AnimDefs map[string]*AnimDef
@@ -22,6 +18,7 @@ var (
 
 	// Ensure ref types satisfy interfaces.
 	_ Loader = &ImageRef{}
+	_ Loader = &SceneRef{}
 	_ Scener = &SceneRef{}
 )
 
@@ -71,14 +68,14 @@ func (r *ImageRef) Image() *ebiten.Image {
 // Load loads the image. Load is required before Image returns.
 // Loading the same path multiple times uses a cache to return
 // the same image.
-func (r *ImageRef) Load() error {
+func (r *ImageRef) Load(g *Game) error {
 	// Fast path load from cache
 	r.image = imageCache[r.Path]
 	if r.image != nil {
 		return nil
 	}
 	// Slow path
-	f, err := AssetFS.Open(r.Path)
+	f, err := g.AssetFS.Open(r.Path)
 	if err != nil {
 		return err
 	}
@@ -108,8 +105,8 @@ type SceneRef struct {
 }
 
 // Load loads the scene from the file.
-func (r *SceneRef) Load() error {
-	f, err := AssetFS.Open(r.Path)
+func (r *SceneRef) Load(g *Game) error {
+	f, err := g.AssetFS.Open(r.Path)
 	if err != nil {
 		return err
 	}

engine/game.go

@@ -2,6 +2,7 @@ package engine
 
 import (
 	"encoding/gob"
+	"io/fs"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
@@ -14,6 +15,7 @@ func init() {
 // One component must be the designated root component - usually a
 // scene of some kind.
 type Game struct {
+	AssetFS      fs.FS
 	ScreenWidth  int
 	ScreenHeight int
 	Root         DrawUpdater // typically a *Scene or SceneRef though
@@ -94,7 +96,7 @@ func (g *Game) Load() error {
 		if !ok {
 			return nil
 		}
-		return l.Load()
+		return l.Load(g)
 	})
 }
 

engine/interface.go

@@ -39,7 +39,7 @@ type Identifier interface {
 // Loader components get the chance to load themselves. This happens
 // before preparation.
 type Loader interface {
-	Load() error
+	Load(game *Game) error
 }
 
 // ParallaxScaler components have a scaling factor. This is used for

main.go

@@ -20,7 +20,6 @@ func main() {
 	ebiten.SetWindowSize(640, 480)
 	ebiten.SetWindowTitle("TODO")
 
-	engine.AssetFS = assets
 	// engine.AnimDefs set in game/anims.go
 
 	denseTiles := [][]engine.Tile{
@@ -103,6 +102,7 @@ func main() {
 	}
 
 	game := &engine.Game{
+		AssetFS:      assets,
 		ScreenHeight: 240,
 		ScreenWidth:  320,
 		Root: &engine.Scene{