Build a simple animation viewer

internal/assetstore/ani.go

@@ -0,0 +1,78 @@
+package assetstore
+
+import (
+	"code.ur.gs/lupine/ordoor/internal/idx"
+)
+
+type Animation struct {
+	Frames []*Sprite
+}
+
+func (a *AssetStore) AnimationsIndex() (*idx.Idx, error) {
+	if a.idx != nil {
+		return a.idx, nil
+	}
+
+	filename, err := a.lookup("WarHammer", "idx", "Idx")
+	if err != nil {
+		return nil, err
+	}
+
+	idx, err := idx.Load(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	a.idx = idx
+	return idx, nil
+}
+
+func (a *AssetStore) AnimationsObject() (*Object, error) {
+	if a.aniObj != nil {
+		return a.aniObj, nil
+	}
+
+	filename, err := a.lookup("WarHammer", "ani", "Anim")
+	if err != nil {
+		return nil, err
+	}
+
+	obj, err := a.ObjectByPath(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	a.aniObj = obj
+	return obj, nil
+}
+
+func (a *AssetStore) Animation(groupIdx, recIdx int) (*Animation, error) {
+	idx, err := a.AnimationsIndex()
+	if err != nil {
+		return nil, err
+	}
+
+	obj, err := a.AnimationsObject()
+	if err != nil {
+		return nil, err
+	}
+
+	group := idx.Groups[groupIdx]
+	if group.Spec.Count == 0 {
+		return &Animation{}, nil
+	}
+
+	//	rec := group.Records[recIdx]
+	det := group.Details[recIdx]
+
+	first := int(group.Spec.SpriteIdx) + int(det.FirstSprite)
+	last := int(group.Spec.SpriteIdx) + int(det.LastSprite)
+	count := last - first + 1
+
+	sprites, err := obj.Sprites(first, count)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Animation{Frames: sprites}, nil
+}

internal/assetstore/assetstore.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"code.ur.gs/lupine/ordoor/internal/data"
+	"code.ur.gs/lupine/ordoor/internal/idx"
 )
 
 const (
@@ -34,17 +35,18 @@ type AssetStore struct {
 	entries entryMap
 
 	// These members are used to store things we've already loaded
+	aniObj    *Object
 	cursorObj *Object
-
-	cursors map[CursorName]*Cursor
-	fonts   map[string]*Font
-	generic *data.Generic
-	maps    map[string]*Map
-	menus   map[string]*Menu
-	objs    map[string]*Object
-	sets    map[string]*Set
-	sounds  map[string]*Sound
-	strings *data.I18n
+	cursors   map[CursorName]*Cursor
+	fonts     map[string]*Font
+	generic   *data.Generic
+	idx       *idx.Idx
+	maps      map[string]*Map
+	menus     map[string]*Menu
+	objs      map[string]*Object
+	sets      map[string]*Set
+	sounds    map[string]*Sound
+	strings   *data.I18n
 }
 
 // New returns a new AssetStore
@@ -88,10 +90,12 @@ func (a *AssetStore) Refresh() error {
 	}
 
 	// Refresh
+	a.aniObj = nil
 	a.cursorObj = nil
 	a.cursors = make(map[CursorName]*Cursor)
 	a.entries = newEntryMap
 	a.fonts = make(map[string]*Font)
+	a.idx = nil
 	a.maps = make(map[string]*Map)
 	a.menus = make(map[string]*Menu)
 	a.objs = make(map[string]*Object)

internal/assetstore/menu.go

@@ -41,18 +41,7 @@ func (m *Menu) Images(objIdx, start, count int) ([]*ebiten.Image, error) {
 }
 
 func (m *Menu) Sprites(objIdx, start, count int) ([]*Sprite, error) {
-	out := make([]*Sprite, count)
-
-	for i := start; i < start+count; i++ {
-		sprite, err := m.Sprite(objIdx, i)
-		if err != nil {
-			return nil, err
-		}
-
-		out[i-start] = sprite
-	}
-
-	return out, nil
+	return m.objects[objIdx].Sprites(start, count)
 }
 
 func (m *Menu) Sprite(objIdx, idx int) (*Sprite, error) {

internal/assetstore/object.go

@@ -90,6 +90,21 @@ func (o *Object) LoadSprites() error {
 	return nil
 }
 
+func (o *Object) Sprites(start, count int) ([]*Sprite, error) {
+	out := make([]*Sprite, count)
+
+	for i := start; i < start+count; i++ {
+		sprite, err := o.Sprite(i)
+		if err != nil {
+			return nil, err
+		}
+
+		out[i-start] = sprite
+	}
+
+	return out, nil
+}
+
 func (o *Object) Sprite(idx int) (*Sprite, error) {
 	if sprite := o.sprites[idx]; sprite != nil {
 		return sprite, nil