opensa

An open-source, from-scratch game engine, built compatible with RenderWare — the engine behind GTA San Andreas. Bring your own game files (or a total-conversion mod) and it streams the real world, models and physics straight into the browser, with no install.

Unofficial, non-commercial fan project. Not affiliated with Rockstar Games or Take-Two.

Blog

Dev notes and progress - in /blog.

• 2026-06-18 - I ran GTA San Andreas on my own engine in the browser - solo with Claude, in 3 weeks
• 2026-07-08 - How I built a perfect GTA San Andreas map with my own engine

What's inside

A TypeScript / WebGPU engine for RenderWare assets (DFF/TXD models, COL collision, IMG archives, IPL/IDE world streaming) with a Rapier-physics player and vehicles — compatible with GTA San Andreas and its mods / total conversions. See the architecture overview and the per-feature reference in docs/features/.

Contributing

Contributions are welcome - see CONTRIBUTING.md for setup, the dev workflow, and conventions. First-time asset setup: docs/development/getting-started.md.

License

Copyright (c) 2026 Aleksandrov Sergey

The OpenSA source code is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). You may use, modify and redistribute it under the terms of that license; if you run a modified version as a network service, you must offer its source to users. See LICENSE for the full text.

This license covers only the original OpenSA code. GTA San Andreas assets, models, maps, names and trademarks are the property of Rockstar Games / Take-Two Interactive and are not covered by it or distributed with this project. OpenSA is an unofficial, non-commercial fan project, not affiliated with Rockstar Games or Take-Two.

Legal & takedowns

OpenSA is an experiment and an unofficial, non-commercial fan project. It is not affiliated with, endorsed by, or sponsored by Rockstar Games or Take-Two Interactive, and it is not a way to obtain, copy, or redistribute their games — it's an alternative way to run a copy you already own.

• No game assets are included or distributed in this repository. To run the engine you must supply files from your own legitimate copy of the game (or a community mod you have the right to use).
• "Grand Theft Auto", "GTA", "San Andreas", RenderWare, and related names, logos and trademarks belong to their respective owners. They are used here only descriptively, to state what the engine is compatible with — not as branding.
• The public demo at opensa.cc may load community mod content; all such content remains the property of its respective authors.

If you are a rights holder and believe anything here infringes your rights, please open an issue at https://github.com/AlexSergey/opensa/issues or email the maintainer, Aleksandrov Sergey, at gooddev.sergey@gmail.com, and we will review it in good faith and, where appropriate, remove the material promptly.