What it is
RenoDX is a modding toolset built on ReShade's add-on system that lets modders replace game shaders, inject buffers, add overlays, and upgrade swapchains and texture resources, most often to add proper HDR output to DirectX games. It also stores user settings on disk and ships extra utilities such as an FPS limiter, a developer kit for building add-ons, and a decompiler for Shader Model 6.0+. Modders write per-game add-ons with it, and players install those mods to improve image quality in titles that lack native HDR.