← ≡ § → Architecture, Performance, and Games Before we plunge headfirst into a pile of patterns, I thought it might help to give you some context about how I think about software architecture and how it applies to games. It may help you understand the rest of this book better.

If nothing else, when you get dragged into an argument about how terrible (or awesome) design patterns and software architecture are, it will give you some ammo to use. Note that I didn’t presume which side you’re taking in that fight. Like any arms dealer, I have wares for sale to all combatants. If you read this book cover to cover, you won’t come away knowing the linear algebra behind 3D graphics or the calculus behind game physics. It won’t show you how to alpha-beta prune your AI’s search tree or simulate a room’s reverberation in your audio playback.

Wow, this paragraph would make a terrible ad for the book. Instead, this book is about the code between all of that.

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It’s less about writing code than it is about organizing it. Every program has some organization, even if it’s just “jam the whole thing into main() and see what happens”, so I think it’s more interesting to talk about what makes for good organization. How do we tell a good architecture from a bad one? I’ve been mulling over this question for about five years.

Of course, like you, I have an intuition about good design. We’ve all suffered through codebases so bad, the best you could hope to do for them is take them out back and put them out of their misery. Let’s admit it, most of us are responsible for a few of those. Convert ost to pst free software. A lucky few have had the opposite experience, a chance to work with beautifully designed code. The kind of codebase that feels like a perfectly appointed luxury hotel festooned with concierges waiting eagerly on your every whim. What’s the difference between the two? For me, good design means that when I make a change, it’s as if the entire program was crafted in anticipation of it.

I can solve a task with just a few choice function calls that slot in perfectly, leaving not the slightest ripple on the placid surface of the code. That sounds pretty, but it’s not exactly actionable.