This is a face makeup tool used for The Pretty Girls.
You can change makeup easily, and there are 6 brow textures, 6 cheek textures, 6 eyeball textures, 6 eye makeup textures, 6 forehead textures, 6 lip textures for you to choose.
You can also adjust face color, face color and makeup textures are finally combined to one texture and rendered in one drawcall.
Furthermore, a customized shader is supplied for face rendering, which is also used by The Pretty Girls.