本程序中才用了立方体贴图，opengl执行光照计算，并根据标准光照模式计算单个片断的颜色。然后这些片断颜色与应用到几何图形的过滤纹理单元混合。-This procedure have used the cube texture, opengl implementation of lighting calculation, and in accordance with standard illumination pattern of a single fragment color. And the