As you know, SSAO generally requires screen space normals to achieve good results. The common approach is to run a normal pre-pass, but this requires rendering objects an extra time, which negatively impacts performance on mobile platforms.
Mobile SSAO is a plugin designed to address this issue. It uses MRT technology to solve the pre-pass normal problem, thereby avoiding the need to render objects an additional time and improving performance on mobile devices. The related feature list is as follows:
MRT SSAO architecture
SSAO tint color
Per object direct lighting strength weight
SSAO intensity parameter
Detection sphere parameter
Directional lighting strength parameter
Related integrated MRT normal object shader examples