AmnesiaTheDarkDescent

Project is seemingly dead with the latest commit being from 2018. Two major games with code on github I can think of are Amnesia: The Dark Descent (1) and Celeste (2) (1) https://github.com/FrictionalGames/AmnesiaTheDarkDescent (2) https://github.com/NoelFB/Celeste

Games might be an interesting one to look at because they have a little bit of everything going on (physics, math, rendering, cross platform abstractions, window management, system calls, file management, memory management, etc...) Take a look at these: https://github.com/FrictionalGames/AmnesiaTheDarkDescent https://github.com/FrictionalGames/PenumbraOverture

And the macros used for the implementation are available here: https://github.com/FrictionalGames/AmnesiaTheDarkDescent/blo... Scary stuff.

The monster's AI is amusing to read, and its behavior has a surprising amount of depth. Really explains its scary, clever and unpredictable nature. It has over 15 different behavior states: Idle, GoHome, Wait, Patrol, Investigate, Alert, Search, Eat, Hurt, Hunt, HuntPause, HuntWander, AttackMeleeShort, AttackMeleeLong, AttackRange, BreakDoor, Dead, Flee, Stalk, Track States: https://github.com/FrictionalGames/AmnesiaTheDarkDescent/blo... Implementation: https://github.com/FrictionalGames/AmnesiaTheDarkDescent/blo... There's also naming gems like "mindfuckevents" https://github.com/FrictionalGames/AmnesiaTheDarkDescent/blo...

Pretty impressive. These games have sold millions of copies. Here's the GitHub the repo for Amnesia: The Dark Descent, https://github.com/FrictionalGames/AmnesiaTheDarkDescent — looks like a custom C++ engine called HPL using SDL for input, Newton Dynamics for 3d physics, and OpenGL for graphics? The engine also supports AngelScript for scriping in-game events & logic: https://www.angelcode.com/angelscript/