Alpha To Coverage(A2C)是一种经由流水线完成的“Alpha Test”。在使用了多重采样(Multi-sample)的场合下，经由检测当前需要绘制的fragment的alpha值来决定该fragment在对应像素上的sample覆盖率。应该说，这也算是很有历史感的显卡应用技术了，而本文将重在谈及此技术之前将在流水线level老生重弹一下MultiSample。
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