Now you can play DOOM on your GPU. You are confused? Well this means the CPU is no longer used for the logic of the game, it runs basically entirely on GPU. So the graphics card is not only used for graphics, but the main logic of the game. It just needs a little bit help from CPU to start the process I think.

• News Article: https://www.phoronix.com/news/DOOM-ROCm-LLVM-Port
• Project Source: https://github.com/jhuber6/doomgeneric/tree/amdgpu

It's a fork from a fork of a fork of a fork:

id-Software/DOOM > insane-adding-machines/DOOM > maximevince/fbDOOM > ozkl/doomgeneric > jhuber6/doomgeneric/tree/amdgpu

I quote the developer (from README):

why

Because I can.