ordoor/internal/assetstore/object.go

package assetstore

import (
	"log"

	"github.com/hajimehoshi/ebiten"

	"code.ur.gs/lupine/ordoor/internal/data"
)

type Object struct {
	assets *AssetStore
	images []*ebiten.Image

	raw *data.Object
}

func (a *AssetStore) Object(name string) (*Object, error) {
	name = canonical(name)

	if obj, ok := a.objs[name]; ok {
		return obj, nil
	}
	log.Printf("Loading object %v", name)

	filename, err := a.lookup(name, "obj", "Obj")
	if err != nil {
		return nil, err
	}

	raw, err := data.LoadObjectLazily(filename)
	if err != nil {
		return nil, err
	}
	raw.Name = name

	obj := &Object{
		assets: a,
		images: make([]*ebiten.Image, int(raw.NumSprites)),
		raw:    raw,
	}
	a.objs[name] = obj

	return obj, nil
}

// Filled lazily
func (o *Object) Image(idx int) (*ebiten.Image, error) {
	if img := o.images[idx]; img != nil {
		return img, nil
	}
	log.Printf("Loading sprite %v %v", o.raw.Name, idx)

	if o.raw.Sprites[idx] == nil {
		if err := o.raw.LoadSprite(idx); err != nil {
			return nil, err
		}
	}

	stdImg := o.raw.Sprites[idx].ToImage()
	img, err := ebiten.NewImageFromImage(stdImg, ebiten.FilterDefault)
	if err != nil {
		return nil, err
	}

	o.images[idx] = img

	return img, nil
}