Before the shaders appeared, it was the T&L (transformation and lighting) engine that provided geometrical processing of vertices, while the multitexturing (MT) engine was in charge of rasterization.

• 在着色器出现之前，人们使用T&L（转换与光照）引擎来提供对顶点的几何处理，多重纹理（MT）引擎从属于光栅化过程。