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I remember randomly reading about this in the Hugi demoscene diskmag as a young teen, and it completely blew my mind (notably the reverse transform, apparently not covered in OP's article): https://hugi.scene.org/online/coding/hugi%2013%20-%20cobwt.h...

The author later wrote many now-famous articles, including A Trip Through the Graphics Pipeline.

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Same; any time I see BWT I think of Fabian Giesen. I think he was only 16 or 17 when he wrote that article.

By chance I once sat near him and the rest of Farbrausch at a demoparty, but I was too shy to say hi.

Oh wow, I clicked that link without reading the last section of your comment, and was like “Fabian Giesen!”, an absolute HN favourite: https://hn.algolia.com/?q=fgiesen

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