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A developer shares their 3-month journey building a game engine from scratch in C++ using DirectX 9 and Win32 API. The project involved creating a Breakout clone with custom rendering pipeline, physics simulation, collision detection (including swept AABB to prevent tunneling), and state management. Key lessons include the importance of architectural planning, implementing the State Pattern for game states, separating collision detection from resolution, and understanding what high-level engines like Unity abstract away. The article provides detailed technical explanations of DirectX 9 initialization, the rendering pipeline, and solutions to common problems like object tunneling and architecture disasters.

I Built a Game Engine from Scratch in C++ (Here's What I Learned)

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