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Valuable programming principles from the early ID Software days as shared by John Romero in his talk at GDC Europe 2016.
Watch the talk here:
https://www.youtube.com/watch?v=E2MIpi8pIvY
Alternative videos:
https://www.youtube.com/watch?v=Zc3VRjsZN-g
https://www.youtube.com/watch?v=KFziBfvAFnM
No prototypes. Just make the game. Polish as you go. Don't depend on polish happening later. Always maintain constantly shippable code.
It's incredibly important that your game can always be run by your team. Bulletproof your engine by providing defaults upon load failure.
Keep your code absolutely simple. Keep looking at your functions and figure out how you can simplify further.
Great tools help make great games. Spend as much time on tools as possible.
We are our own best testing team and should never allow anyone else to experience bugs or see the game crash. Don't waste other's time. Test thoroughly before checking in your code.
As soon as you see a bug, you fix it. Do not continue on. If you don't fix your bugs your new code will be built on a buggy codebase and ensure an unstable foundation.
Use a superior development system than your target.
Write your code for this game only - not for a future game. You're going to be writing new code later because you'll be smarter.
Encapsulate functionality to ensure design consistency. This minimizes mistakes and saves design time.
Try to code transparently. Tell your lead and peers exactly how you are going to solve your current task and get feedback and advice. Do not treat game programming like each coder is a black box. The project could go off the rails and cause delays.
Programming is a creative art form based in logic. Every programmer is different and will code differently. It's the output that matters.
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All principles, except the headers in this document are attributed to John Romero, the Game Programmer God.