Irrlicht Engine

Hello everyone!
I'm trying to make this shader work, but I can't do it at all.
I found a shader on the internet to simulate a distortion effect, and I'm trying to apply it to a plane, but the screen just flashes, and I can't see the effect.
Is there something wrong with the code?
Some help?

water ...

Hello guys!
It's possible to mix high level and low level shaders?
I have a shaders here, but were written in assembly.

Thanks.