89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package sceneio
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import (
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"aego/core/errs"
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"aego/core/ids"
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"aego/core/log"
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"aego/format/aetext"
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"aego/scene"
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"aego/scene/prefab"
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"aego/schema"
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)
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const PrefabName = "engine.PrefabInstance"
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var prefabTypeID = schema.HashName(PrefabName)
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type PrefabInstance struct {
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Prefab ids.AssetID `aego:"-"`
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Owner bool `aego:"-"`
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Nested bool `aego:"-"`
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Missing bool `aego:"-"`
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Keys map[ids.NodeID]prefab.Key `aego:"-"`
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Orphans prefab.Overrides `aego:"-"`
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Extra []*aetext.Node `aego:"-"`
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Block *aetext.Node `aego:"-"`
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}
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func RegisterPrefab(t *scene.Types) error {
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if err := scene.RegisterComponent[PrefabInstance](t, schema.Name(PrefabName),
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schema.Doc("links a node to the prefab it was created from")); err != nil {
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return err
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}
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if td, ok := t.Schema().ByName(PrefabName); ok {
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td.Hidden = true
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}
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return nil
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}
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func InstanceOf(s *scene.Scene, h scene.NodeHandle) (*PrefabInstance, bool) {
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p, ok := s.GetByType(h, prefabTypeID)
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if !ok {
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return nil, false
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}
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return (*PrefabInstance)(p), true
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}
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func addInstance(s *scene.Scene, h scene.NodeHandle) (*PrefabInstance, bool) {
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p, err := s.AddByType(h, prefabTypeID)
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if err != nil {
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return nil, false
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}
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return (*PrefabInstance)(p), true
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}
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func PrefabRoot(s *scene.Scene, h scene.NodeHandle) (scene.NodeHandle, bool) {
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for c := h; !c.IsZero() && c != s.Root() && s.IsAlive(c); c = s.Parent(c) {
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if _, ok := InstanceOf(s, c); ok {
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return c, true
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}
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}
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return scene.NodeHandle{}, false
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}
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type Template struct {
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Prefab ids.AssetID
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Doc []byte
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}
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func Instantiate(s *scene.Scene, parent scene.NodeHandle, t *Template) (scene.NodeHandle, error) {
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created, _, err := LoadInto(s, parent, t.Doc, "prefab "+t.Prefab.Short(), LoadOptions{})
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if err != nil {
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return scene.NodeHandle{}, err
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}
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at := parent
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if at.IsZero() {
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at = s.Root()
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}
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for _, h := range created {
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if s.Parent(h) != at {
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continue
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}
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if pi, ok := addInstance(s, h); ok {
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pi.Prefab, pi.Owner, pi.Nested = t.Prefab, false, false
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}
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return h, nil
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}
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return scene.NodeHandle{}, errs.New(errs.SceneIOParse, "prefab template has no root node", log.F("prefab", t.Prefab.String()))
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}
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