Godot Shading Language (GLSL-like) porting of the Sketchy Shader (originally written in Open Shading Language)
GDSL (Godot Shading Language) is similar to GLSL ES 3.0. Most datatypes and functions are supported. Like the OSL-counterpart, it takes an image as input mask (in this case the one called Poisson_Noise.png). It is possible to outline the object by applying the Outline Material in the Next Pass section of the principle material.
Sketchy Shader in Open Shading Language: https://github.com/Iranon/OSL-Sketchy_Shader