Function lateUpdate

packages/core/src/ECS/Systems/EntitySystem.ts:826–853

* 后期更新系统 * * lateUpdate 复用 update 中 onCheckProcessing() 的结果， * 避免 IntervalSystem 等子类的副作用被重复执行。 * * lateUpdate reuses the onCheckProcessing() result from update, * preventing side effects in subclasses like IntervalSystem from executing repeatedly.

()

     * preventing side effects in subclasses like IntervalSystem from executing repeatedly.
     */
    public lateUpdate(): void {
        // 复用 update() 中的检查结果，不再调用 onCheckProcessing()
        // Reuse check result from update(), don't call onCheckProcessing() again
        if (!this._shouldProcessThisFrame) {
            return;
        }

        const monitor = this.getPerformanceMonitor();
        const startTime = monitor.startMonitoring(`${this._systemName}_Late`);
        let entityCount = 0;

        try {
            // 重新查询实体以获取最新列表
            // 在 update 和 lateUpdate 之间可能有新组件被添加（事件驱动设计）
            // Re-query entities to get the latest list
            // New components may have been added between update and lateUpdate (event-driven design)
            // ReactiveQuery.getEntities() 返回的是安全快照，只在实体变化时才创建新数组
            const entities = this.queryEntities();
            this._entityCache.setFrame(entities);
            entityCount = entities.length;
            this.lateProcess(entities);
            this.onEnd();
        } finally {
            monitor.endMonitoring(`${this._systemName}_Late`, startTime, entityCount);
            // 清理帧缓存
            this._entityCache.clearFrame();
        }
    }

    /**
     * 执行命令缓冲区中的所有延迟命令