Are there any similar options for the original xbox ?

[SeleDreams]

I've been thinking that could be great for og Xbox sonic games such as Shadow the Hedgehog, because those use the Renderware renderer which already has an open source reimplementation https://github.com/aap/librw

That means that as long as the recompilation part can be done CPU wise, it should be possible to directly hook it to the renderware reimplementation to handle the graphics part.