Package swiftshader?
Created by: steamp0rt
swiftshader looks like an interesting project... it provides both OpenGL ES and D3D9 software rendering. It claims to be a "drop-in replacement for graphics drivers", meaning adding support to software would be minimal or unneeded. It uses CMake, and packages it's own dependencies in the git, so that shouldn't be a problem. It also seems to support ARM.
The question is, would the tinygles-glshim setup or mesa-egl/swrast/etc be necessary with this?