H2OT3

Overview

H2OT3 is an experimental cross‑platform GUI framework written in C.
Its goal is to provide a fast, secure, and simple foundation for building graphical applications with minimal overhead.

This project is currently a proof of concept.
Many features are incomplete or experimental.

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Current Status

H2OT3 is in early development.
The following limitations currently apply:

• Windows cannot be displayed reliably yet
• The event system is not implemented
• Several backends are missing or incomplete
• API design is still evolving
• No stable release yet

Despite this, the project already demonstrates the core ideas behind a lightweight, backend‑agnostic GUI layer.

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Goals

• Cross‑platform windowing (Win32, XCB, Cocoa, …)
• Minimal and clean C API
• Fast startup and low overhead
• Secure memory handling
• Backend‑agnostic rendering
• Simple integration into existing C projects

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Planned Features (Roadmap)

• Basic window creation on all platforms
• Event system (keyboard, mouse, resize, focus)
• Rendering abstraction
• Example applications
• Documentation
• First stable release (v0.1.0)

Another similar roadmap is in ROADMAP.md

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Building

cmake -S . -B build
cmake --build build

Contributing

See CONTRIBUTING.md

License

See LICENSE.md