How to achieve Celshade/ object outline for Postprocess mobile?

Hey, does anyone know of a way to achieve this since apparently we can’t use SceneTextures on mobile (or at least android not sure about iOS) been messing with a few things but can’t seem to get it working, if anything just object outline would be great for now I can always work on the cel shade my self probably. I’m testing this on a samsung S5 whcih i think uses the ES5 standard of textures