“We have now achieved this by building a brand new Windows driver called Triton which along with Neptune brings full DirectX 11 support to QEMU virtual machines.”

UTM blog / Hacker News · UTM releases Triton: DirectX 11 driver bringing GPU acceleration to QEMU Windows VMs

“The correct approach is not to implement the DirectX APIs but to implement the DirectX DDIs (Device Driver Interface).”

UTM blog / Hacker News · UTM releases Triton: DirectX 11 driver bringing GPU acceleration to QEMU Windows VMs

“you cannot get good performance because the window compositor (DWM) "sees" your frame as an image so it needs to use CPU blitting to copy the GPU image buffer to the correct window location.”

UTM blog / Hacker News · UTM releases Triton: DirectX 11 driver bringing GPU acceleration to QEMU Windows VMs