97 lines
1.7 KiB
Go
97 lines
1.7 KiB
Go
package engine
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import (
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"encoding/gob"
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"io/fs"
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"path/filepath"
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)
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var (
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_ scener = &Scene{}
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_ interface {
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Loader
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Saver
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scener
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} = &SceneRef{}
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)
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type scener interface {
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BoundingRecter
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Disabler
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Hider
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Identifier
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Registrar
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Scanner
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}
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func init() {
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gob.Register(&Scene{})
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gob.Register(&SceneRef{})
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}
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// Scene gives an identity, bounds, and other properties to a collection of
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// components.
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type Scene struct {
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ID
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Bounds // world coordinates
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Components
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Disables
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Hides
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}
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func (s *Scene) Register(component, parent interface{}) error {
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if parent == s {
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s.Components = append(s.Components, component)
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}
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return nil
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}
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func (s *Scene) Unregister(component interface{}) {
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for i, c := range s.Components {
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if c == component {
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s.Components[i] = nil
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}
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}
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}
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// SceneRef loads a gzipped, gob-encoded Scene from the asset FS.
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// After Load, Scene is usable.
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// This is mostly useful for scenes that refer to other scenes, e.g.
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//
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// sc := &Scene{
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// Components: []interface{}{
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// &SceneRef{Path: "assets/foo.gob.gz"} // inflated at Load time
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// },
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// }
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type SceneRef struct {
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Path string
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*Scene // not gob encoded
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}
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// GobDecode saves the byte slice as Path.
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func (r *SceneRef) GobDecode(b []byte) error {
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r.Path = string(b)
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return nil
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}
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// GobEncode returns Path as a byte slice.
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func (r *SceneRef) GobEncode() ([]byte, error) {
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return []byte(r.Path), nil
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}
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// Load loads the scene from the file.
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func (r *SceneRef) Load(assets fs.FS) error {
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sc := new(Scene)
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if err := LoadGobz(sc, assets, r.Path); err != nil {
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return err
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}
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r.Scene = sc
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return nil
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}
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// Save saves the scene to a file in the current directory.
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func (r *SceneRef) Save() error {
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return SaveGobz(r.Scene, filepath.Base(r.Path))
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}
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