Good news, it's totally possible! The shader actually requires the masks be separate, hence the extra input materials at the front end. All the mask slots are there, so if you have the individual textures it's actually a bit easier to set everything up properly. First of all you can delete everything in the Source 1 mask…
Hey there, Had a lash at making a real-time viewport shader for anyone trying to create content in Blender. Yes, real time, in the viewport. It consists mostly of hacks and a ton of nodes, but it seems to more or less work. I'd be interested to see if it's of any use to anyone, and also how close I got with it... There are…