Fix animation sholud reset when reenabled (#2252)

* fix: animation sholud reset when reenabled

e2e/case/animator-play-beforeActive.ts

@@ -0,0 +1,38 @@
+/**
+ * @title Animation Play
+ * @category Animation
+ */
+import { Animator, Camera, DirectLight, GLTFResource, Logger, Vector3, WebGLEngine } from "@galacean/engine";
+import { OrbitControl } from "@galacean/engine-toolkit";
+import { initScreenshot, updateForE2E } from "./.mockForE2E";
+
+Logger.enable();
+WebGLEngine.create({ canvas: "canvas" }).then((engine) => {
+  engine.canvas.resizeByClientSize(2);
+  const scene = engine.sceneManager.activeScene;
+  const rootEntity = scene.createRootEntity();
+
+  // camera
+  const cameraEntity = rootEntity.createChild("camera_node");
+  cameraEntity.transform.position = new Vector3(0, 1, 5);
+  const camera = cameraEntity.addComponent(Camera);
+  cameraEntity.addComponent(OrbitControl).target = new Vector3(0, 1, 0);
+
+  const lightNode = rootEntity.createChild("light_node");
+  lightNode.addComponent(DirectLight).intensity = 0.6;
+  lightNode.transform.lookAt(new Vector3(0, 0, 1));
+  lightNode.transform.rotate(new Vector3(0, 90, 0));
+  rootEntity.isActive = false;
+  engine.resourceManager
+    .load<GLTFResource>("https://gw.alipayobjects.com/os/bmw-prod/5e3c1e4e-496e-45f8-8e05-f89f2bd5e4a4.glb")
+    .then((gltfResource) => {
+      const { defaultSceneRoot } = gltfResource;
+      rootEntity.addChild(defaultSceneRoot);
+      const animator = defaultSceneRoot.getComponent(Animator);
+      animator.play("agree");
+      rootEntity.isActive = true;
+      updateForE2E(engine);
+
+      initScreenshot(engine, camera);
+    });
+});

e2e/config.ts

@@ -45,6 +45,11 @@ export const E2E_CONFIG = {
       caseFileName: "animator-play",
       threshold: 0.1
     },
+    playBeforeActive: {
+      category: "Animator",
+      caseFileName: "animator-play-beforeActive",
+      threshold: 0.1
+    },
     reuse: {
       category: "Animator",
       caseFileName: "animator-reuse",

packages/core/src/animation/Animator.ts

@@ -227,10 +227,7 @@ export class Animator extends Component {
    * @internal
    */
   override _onEnable(): void {
-    const layersData = this._animatorLayersData;
-    for (let i = 0, n = layersData.length; i < n; i++) {
-      layersData[i].layerState = LayerState.Standby;
-    }
+    this._reset();
     this._entity.getComponentsIncludeChildren(Renderer, this._controlledRenderers);
   }