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Thank you! That was a typo and is hopefully fixed now.

The source code is now available.

You can find the shader in Shaders/template.glsl. The signed distance field function is inserted into that shader and recompiled everytime the scene changes. All variables are uniforms so that changing them is possible without recompiling.

You should be able to use the template and insert the generated code that's visible in the editor manually.

Do you mean the whole per-pixel shader? The program is written in Godot so it isn't actual GLSL code but pretty close.