Function makeHandle

packages/core/src/ECS/Core/EntityHandle.ts:73–77

(index: number, generation: number)

 * @returns 实体句柄 | Entity handle
 */
export function makeHandle(index: number, generation: number): EntityHandle {
    // handle = generation * 2^28 + index
    // 使用乘法而不是位移，因为位移只支持 32 位
    return ((generation & GEN_MASK) * MAX_ENTITIES + (index & INDEX_MASK)) as EntityHandle;
}

/**
 * 从句柄提取索引