What shaders were used in the minecraft handbooks?

When i was younger I got this minecraft redstone handbook in which there is pictures of examples of what you can build in minecraft. They seem to have used shaders in these pictures and its really nostalgic to me, so now that I have a computer that can run shaders, im trying to figure out which shaders were used in the book. does anyone know what shaders were used? heres a video for reference: https://www.youtube.com/watch?v=5ACbaHpcbZ0

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