lc700x/desktop2stereo ? reverse-engineered prompt

Build me a desktop app that can take whatever is on my screen and turn it into a live 3D stereo view for VR or a 3D monitor.

I want it to work on Windows, Mac, and Ubuntu, and to handle different kinds of GPUs, including NVIDIA, AMD, Intel, Qualcomm, and Apple Silicon. The app should let me pick a monitor or window, choose the device to use, and then run in a simple mode with sensible defaults.

Please include the main viewing options like an OpenXR link for VR headsets, a local 3D viewer, and streaming modes for sharing the result. It should feel easy to launch, with a clean UI and a straightforward setup flow. If you need to check current docs or best practices for GPU support on each platform, go ahead and look them up online.