image ref?

engine/asset.go

@@ -0,0 +1,16 @@
+package engine
+
+import "github.com/hajimehoshi/ebiten/v2"
+
+type ImageRef struct {
+	Path string
+
+	image *ebiten.Image
+}
+
+func (r *ImageRef) Image() *ebiten.Image {
+	if r.image == nil {
+		// TODO
+	}
+	return r.image
+}

engine/debug.go

@@ -1,6 +1,7 @@
 package engine
 
 import (
+	"encoding/gob"
 	"fmt"
 	"math"
 
@@ -8,6 +9,10 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 )
 
+func init() {
+	gob.Register(PerfDisplay{})
+}
+
 // PerfDisplay debugprints CurrentTPS and CurrentFPS in the top left.
 type PerfDisplay struct{}
 

engine/scene.go

@@ -1,12 +1,17 @@
 package engine
 
 import (
+	"encoding/gob"
 	"math"
 	"sort"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
+func init() {
+	gob.Register(Scene{})
+}
+
 // Drawer is a component that can draw itself. Draw is called often.
 type Drawer interface {
 	Draw(screen *ebiten.Image, geom ebiten.GeoM)

engine/tiles.go

@@ -1,11 +1,18 @@
 package engine
 
 import (
+	"encoding/gob"
 	"image"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
+func init() {
+	gob.Register(AnimatedTile{})
+	gob.Register(StaticTile(0))
+	gob.Register(Tilemap{})
+}
+
 type Tilemap struct {
 	Map       [][]Tile
 	Src       *ebiten.Image // must be a horizontal tile set