Animation rows can target behavior variables and shader parameters (#104)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/core/commands/animationCommands.ts

@@ -1,12 +1,12 @@
 import { newId } from '../ids';
 import {
   ANIMATION_ROOT_TYPES,
-  animatableDefs,
-  animatedKind,
   blends,
   isKeyInterpolation,
   normalizeKeys,
   targetAssetOf,
+  targetDefs,
+  trackDef,
   trackValueAt,
 } from '../model/animation';
 import type { AnimationAsset, AnimationKey, AnimationTrack, KeyInterpolation } from '../model/Asset';
@@ -42,10 +42,13 @@ function requireAnimatable(
   property: string,
 ): string {
   if (!findAsset(project, asset.root)) throw new CommandError(`${asset.name} has nothing to animate yet`);
-  const aimed = targetAssetOf(project, asset, target);
-  if (!aimed) throw new CommandError('That object is not part of the animated asset');
-  const kind = animatedKind(aimed.type, property);
-  if (!kind) throw new CommandError(`${aimed.name} has no property ${property} to animate`);
+  const defs = targetDefs(project, asset, target);
+  if (!defs) throw new CommandError('That object is not part of the animated asset');
+  const kind = defs.find((d) => d.key === property)?.kind;
+  if (!kind)
+    throw new CommandError(
+      `${targetAssetOf(project, asset, target)?.name} has no property ${property} to animate`,
+    );
   return kind;
 }
 
@@ -163,8 +166,7 @@ export class RetargetAnimationTrackCommand extends TimelineCommand {
   protected apply(project: Project, asset: AnimationAsset): void {
     const track = requireTrack(asset, this.trackId);
     const kind = requireAnimatable(project, asset, this.target, this.property);
-    const aimed = targetAssetOf(project, asset, track.target);
-    const was = aimed ? animatedKind(aimed.type, track.property) : undefined;
+    const was = trackDef(project, asset, track)?.kind;
     if (was !== undefined && was !== kind) throw new CommandError(`A ${was} row cannot become a ${kind} row`);
     requireUnique(asset, this.target, this.property, track.id);
     track.target = this.target;
@@ -217,8 +219,7 @@ export class SetAnimationKeyCommand extends TimelineCommand {
     const track = requireTrack(asset, this.trackId);
     if (!Number.isInteger(this.frame) || this.frame < 0)
       throw new CommandError('A key sits on a whole frame from 0');
-    const aimed = targetAssetOf(project, asset, track.target);
-    const def = aimed && animatableDefs(aimed.type).find((d) => d.key === track.property);
+    const def = trackDef(project, asset, track);
     if (!def) throw new CommandError('The row aims at something that is gone');
     const current = trackValueAt(track.keys, def.kind, this.frame);
     const raw = this.value ?? current ?? (track.relative ? 0 : def.default);
@@ -252,8 +253,7 @@ export class SetKeyInterpolationCommand extends TimelineCommand {
       const track = requireTrack(asset, ref.trackId);
       const key = track.keys.find((k) => k.frame === ref.frame);
       if (!key) throw new CommandError(`No key on frame ${ref.frame}`);
-      const aimed = targetAssetOf(project, asset, track.target);
-      const kind = aimed ? animatedKind(aimed.type, track.property) : undefined;
+      const kind = trackDef(project, asset, track)?.kind;
       if (kind !== undefined && !blends(kind)) continue;
       if (this.interpolation === 'linear') delete key.interpolation;
       else key.interpolation = this.interpolation;