This is wonderful news, and my sincere thanks to the author. I remember coming upon this algorithm several years ago, and thinking it was extremely elegant and very appealing, but being disappointed by the patent status making it unusable for FOSS work. I really appreciate the author's choice to dedicate it to the public domain after a reasonable amount of time, and congratulations on the success it had while proprietary!

Now if I ever get around to writing that terminal emulator for fun, I'll be tempted to do it with this algorithm for the code's aesthetic appeal.

I used Slug at a previous job. It is an excellent, artfully crafted library; really the pinnacle of software engineering in my opinion. Thanks to the author for donating the algorithm to the public domain!

His latest project is https://radicalpie.com/

A Professional Equation Editor for Windows 10/11 for 60$ that uses Slug for rendering. Presumably he‘s using it to write his great FGED books.

Amazing, Thank you Eric!!

Also, Microsoft's Loop-Blinn patent for cubic curves will expire on March 25. These might change the landscape of text rendering...

Thanks Eric, much appreciated. How would you compare your approach to something like Vello (https://github.com/linebender/vello)?

Love it when someone who makes complex, helpful software is rewarded for their efforts. More stories like this!

I am sorta in a position where implementing a glyph renderer as a compute shader would be helpful. This is a great opportunity to use this as a reference... exciting weekend project!

Damn, I worked with the author's game engine (C4) about... 20 years ago now while still in school, didn't know they were still active in that area!

Is it on ShaderToy yet? :D

This is super cool. A few years ago I was wondering if Ruffle could do something similar, incorporate some kind of GPU accelerated vector graphics.

At the time they were going with, approximating the curves out of triangles. I don't know if they're still doing that though.

> But I think that’s too long. The patent has already served its purpose well, and I believe that holding on to it any longer benefits nobody.

Damn dude didn't you pay like ... over $10k for that patent?

Lengyel continues to be standup dude, kudos!

Finally, some good video game development news!

Awesome algorithm and thank you for donating it to open source!

Thank you!

Oh wow this is crazy. This was a project that was reasonably successful commercially. And now it’s just being given away open source? What an absolutely incredibly gift to the community!!

Amazing! Thank you, Eric!

Thank you for your service!

Here's an alternate if you're also getting connection reset errors:

https://web.archive.org/web/20260317185928/https://terathon....

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this is very cool

This is great news. With the speed of hardware these days, there's really no excuse not to render glyphs directly from the Bézier curves with analytic anti-aliasing. Past solutions like texture atlases and SDFs always felt like a hack and produced sub-par results at arbitrary scales. Hopefully with the open-sourcing of Slug, more major libraries and game engines will adopt the high quality approach.

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