Mach and mach.h

Mach is an isometric factory game written in C. Droppers create ore, conveyors route it, upgraders raise its value, and furnaces turn it into money for the next expansion. I built the game to learn what changes when an engine and its first real user grow together.

The engine became mach.h, a single-header library with an OpenGL 3.3 batch renderer, sprite atlases, bitmap text, arena allocation, input, audio, and immediate-mode UI layout. The game keeps a copy of the header in its source tree and builds with a C compiler and system OpenGL.

This project is paused. It was an experiment, and it taught me a great deal about renderer design, data layout, build systems, and the cost of owning every layer.

What I worked on

• A 2D batch renderer and an isometric view built as a coordinate transform
• A simulation made from typed structs in flat arrays inside one arena
• Hot reloading through a host-owned state block and a reloadable game library
• A unity build driven by a small build program written in C
• Release builds for macOS, Linux, and Windows through GitHub Actions

The engine never names a game type. The game owns its loop and calls the engine directly. That boundary survived the project growing from a renderer experiment into a playable factory loop.

• Game source
• Engine source
• Releases