Global Illumination alternatives

I doubt it technically feasable.
For two reasons:1

  1. This is very high end feature, and GPU who can’t handle DX11, dont have enough power to handle it at all.
  2. GPUs which can handle it, support DX11,12 and Vulkan.

I would rather bet in porting these features to Vulkan/DX12, as they are far more similiar than DX11 and OpenGL.