optiscaler/optiscaler ? reverse-engineered prompt

Build me a Windows tool for PC games that can swap the game’s built in upscaler for another one, and also handle frame generation options where the game already has them or where it can be added in a DX12 game. I want it to work as a middle layer, so the game thinks it is using one upscaler, but the tool can redirect that to another one like DLSS, XeSS, or FSR, depending on what the user picks.

It should have an in game overlay where people can change the selected upscaler, tweak quality and sharpening, adjust scaling behavior, and see performance stats. Keep the setup simple, with an INI file for config and an installer style setup for Windows. If you need to, look up current docs online for the upscaler APIs and frame gen hooks so the implementation matches real games. Also make sure it is organized so it can be built from Visual Studio as a C++ project.