Tonality node with no input generates a very buggy output on Intel integrated graphics

[Arnklit]

Material Maker version: 0.94.Stable

OS/device including version:

Windows 10 64Bit, Intel(R) UHD Graphics 620 - Driver Version: 27.20.100.8885

Issue description:

Tonality node with no input generates a very buggy output on Intel integrated graphics. This is not a big issue as it works fine as soon as an input is set, it just looks bad.

Steps to reproduce: Add a Tonality node running on Intel integrated graphics.

[Arnklit]

This is just how values outside 0-1 look sometimes on intel graphics. An easy fix would just be to clamp the uv.x used as the default input. I guess we could clamp the output of tonality as well, but I don't know if it's sometimes practical to be able to return values outside 0-1?