对正方体加载纹理。使用三种纹理过滤方式加载纹理（线性采样、mipmap和最近点采样）。各个面的纹理不同。鼠标右键弹出式菜单控制纹理过滤方式的切换。-The cubes loaded textures. Using three kinds of texture filtering way load (linear sampling, mipmap and closest point sampling). All the different texture. The right mouse button pop-up menu control texture filtering way switch.