Thank you 
Uniform but I try to avoid coding. ShaderTool is a visual tool, based on nodes.
Here is something a user said about the product :
[quote:t4tzzaqm]I really like this as it makes shader development very efficient by cutting out the tedious aspects of such. It is also very useful for learning purposes, as you don't have to spend so much time doing error-prone juggling of uniforms, shader programs, matrices, etc, in the code of the actual application you intend on implementing the shader in. Instead, all aspects and components of your shader are sorted clearly and concisely across nodes that function in intuitive ways.
In this post : https://www.scirra.com/forum/about-webgl-effects_t118207
Ashley said something about GLSL.
ShaderTool supports GLSL, so I wonder if the program can be used to create shaders for C2 ?