...It enables legacy DirectX applications and games to run on systems where native DirectX support is limited or unavailable, including alternative platforms and compatibility environments.
This project is intended for developers, retro-computing enthusiasts, and compatibility research. It provides a foundation for running legacy graphics software, experimenting with API translation, or extending support for older DirectX-based applications on modern systems.
See article:
https://tech.slashdot.org/story/02/02/12/1824215/an-open-source-direct3d-80-wrapper-for-open-gl