I think I disagree on both points. VAIL is not available yet, that I have seen, and I don't believe it was intended originally for Win32 apps.
I don't think VAIL has shipped yet, and getting that working correctly and securely, as it involves sharing memory between the WSL2 VM with a Linux kernel and the host Windows kernel, seems to me the most likely blocking issue for why they haven't yet released Android app support on Windows. See this comment on the readme of the WSLg repo:
> Please note that for the first release of WSLg, vGPU interops with the Weston compositor through system memory. If running on a discrete GPU, this effectively means that the rendered data is copied from VRAM to system memory before being presented to the compositor within WSLg, and uploaded onto the GPU again on the Windows side.
As for originally being intended for Win32 apps, I do wonder if "Vail" and "VAIL" are different projects within the OS division. The Linux/X11/Wayland and vGPU interop part of VAIL requires different expertise and deep knowledge of the Linux graphical stack.
I mean, I’m using it on stable Windows 11. The README says it shipped in build 21xxx which is 1000 builds behind Windows 11’s number. I can check though.
And for the other parts, the interop bits are new, but the deck from when the WSL2 devs presented this specifically said it was a great solution because it was already being used for Azure Virtual Desktop (hosted Windows VMs).
The difference is not whether GPU applications do or do not work. They work with both. The difference is, do they work with zero copying via shared memory between the Windows host and the WSL virtual machine?
RAIL enabled graphical applications - including those that use the GPU - to be presented as windows on the Windows desktop. But it involves extra latency on the order of several to tens of frames, depending on how expensive the framebuffer copying and synchronization steps are.
VAIL enables performance (and input lag) that is on par with running Linux natively.
I don't think VAIL has shipped yet, and getting that working correctly and securely, as it involves sharing memory between the WSL2 VM with a Linux kernel and the host Windows kernel, seems to me the most likely blocking issue for why they haven't yet released Android app support on Windows. See this comment on the readme of the WSLg repo:
> Please note that for the first release of WSLg, vGPU interops with the Weston compositor through system memory. If running on a discrete GPU, this effectively means that the rendered data is copied from VRAM to system memory before being presented to the compositor within WSLg, and uploaded onto the GPU again on the Windows side.
As for originally being intended for Win32 apps, I do wonder if "Vail" and "VAIL" are different projects within the OS division. The Linux/X11/Wayland and vGPU interop part of VAIL requires different expertise and deep knowledge of the Linux graphical stack.