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A number of these old 3D screensavers are identical to examples in the old OpenGL red book, the version that's now available for free online.

I wonder if they were just copied from the book?

Maybe it is time for decompilation effort?

No need.

That's illegally-leaked source code.

So? That shouldn't stop you if you're curious. It doesn't harm anybody (or any entity at all, even)