Asdf Overlay – High performance in-game overlay library for Windows
I am making a open source overlay library. Game overlay is for rendering contents on top of game screen. Representative examples are Discord and Steam in-game overlay. They are complicated because it has to hook rendering part of a game. Asdf overlay provides easy to use interfaces for rendering on top of game screen. I recognize game performance degradation due to overlay rendering, so GPU shared texture was used to avoid CPU framebuffer copy. Asdf Overlay is capable of rendering full screen overlay without noticeable performance loss.
In plain words
Asdf Overlay is an open-source library for Windows that enables developers to render content on top of games, similar to Discord and Steam overlays. It provides simple interfaces for overlay rendering while minimizing performance impact through GPU shared textures that avoid CPU framebuffer copying. The library can display full-screen overlays without noticeable performance degradation.
written from the facts on this page · September 2026
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