couldn't write a workable shader

[tanhuagui]

Describe the bug

while writing shader ,the specific word is never colored to let me tell it easily and even if I've worked everything out it still reported error, even when I only copied the default shader of gamemaker itself.

Reproducing steps

write a shader ,set the shader and see what's happening.

Setup Details

the newest version the notebook computer nuclear throne mobile

[CST1229]

as far as i know, shaders have binary code that currently can't be modified in the gui, and that also has to be modified for modified shaders to work. (though it is possible to write the shader in an empty project in gamemaker, open the empty project's exported data.win in utmt, export the shader there and import it into another one)