wiki-multiterrain shader with 4 detail maps?

the multiterrain shader in the wiki uses only 2 detail maps.

is it possible to use 4 detail maps without decreasing the framerate much?

how would the code look like?

with steempipes "shader", you can use four textures and the best is, that it ins't slower then without any shader and will run on all cards even, if they don't support shaders, because it uses fixed function pipeline. just look at his homepage.

this is the code from the wiki that i am using now:

link - and here the source1

now how do i add two more detail maps to this skript?

would it also be possible to first show a texture filling the complete heightmap once and on top of this the different detail maps?

i think far cry's terrain works like this...