A game engine is a pretty big solo project. Did you base it off monogame, Godot or something similar, or did you start from scratch?
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I used SDL3 with hardware acceleration, OpenAL, Lua (via sol3), PhysFS, and nlohmann::json. (I could have used only Lua, but the engine needs to interface with the web via WebSockets.) For WebSockets, I use Boost only on desktop and mobile; on the web, I rely on the browser’s native API.
1 - Code is like pasta — much more delicious when homemade.