How to make this?

[aprendiz 0]

What kind of programs are used to make shaders like this?

what programming language is used in .fx files? 

I didn't find any tutorial on youtube and the only shaders in the mta community are S@make and Ren

 

[MrTasty 129]

It's HLSL (High Level Shading Language), used for DirectX shaders.

https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl

There are only a handful of people on MTA who know how to write shaders, which is why its difficult to find any tutorials.