If it is wrong, it has to fetch the value again and redo the increment computation.
如果它的希望落空，就会再次检索值，并重做递增计算。
2
when we have finished our work, we will come again and fetch you.
当我们结束我们的工作，我们会回来这里接你们。
3
Final pass produces final rendered image. Here all objects are rendered again; with shaders that fetch the lighting, combine it with textures and add any emissive lighting.