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 + [Urho3D](https://urho3d.io/)
 + [godot](https://godotengine.org/)
 + Everything else in `3rdparty/`
+
+## Project Structure
+- `buildtools`
+    - `cmake`: CMake scripts consumed by the root `CMakeLists.txt`.
+    - `codegen`: Code generator similar to Qt MOC.
+    Currently runs on: `source`.
+- `source-common`: Code that's compiled as a part of all targets. Check each target's build script for details.
+- `source-codegen-base`: Code that's consumed along with output of `buildtools/codegen`.
+- `source`: The main game.