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I highly recommend both Wolfenstein3D and Doom black books, from Fabien Sanglard, which are very technical and describe really well a ton of things around those games: how they have been developed, the tools they have been developed on / with, the context, ...

Wolfenstein 3D Black Book: https://fabiensanglard.net/gebbwolf3d/

Doom Black Book: https://fabiensanglard.net/gebbdoom/

1 comments

What I did not like about them was you could either buy a google book (only readable via a google app) or as a free but bitmapped Pdf, so bloated that it used to crash my iPad. I did not mind paying, but would like to get some more flexible format.

Good thing you're using the past tense, as he's published source code for both black books:

https://fabiensanglard.net/gebb/index.html

Their current Google Book is listed as DRM free[0]. Is that still restricted to only be downloadable in the Google app, or does that mean I could buy it and just download from the Google Play website itself as an EPUB?

[0]: https://play.google.com/store/books/details/Fabien_Sanglard_...

> What I did not like about them was you could either buy a google book (only readable via a google app)

It is a DRM free book.

I am using another app to read it.