Direct3D 11 in WinUAE 3.6.1

[Octopus66]

I have some questions regarding the behavior of Direct 3D 11 vs 9 with the latest stable WinUAE.

• When I move to the properties window under DIrect 3D 11 the screen blacks out and I am taken back to Windows 10. Does not happen with Direct 3D 9. Is this part and parcel of using D3D11?
  
• Also I have noticed when I run my config which includes CPU Speed slider at -40% from fastest possible, the emulation slows to a crawl using D3D11. No issue with D3D9.

I would like to use D3D11 as I have noticed some improvements in reducing ad-hoc screen tearing to zero on full screen games with low latency v-sync. If I need to provide logs let me know and I will have a go.

Thanks!

[Toni Wilen]

1: yes, D3D11 fullscreen mode does not support any GUI (GDI) elements.
2: "not enough information"

[Octopus66]

Is the attached sufficient to help with point 2? Zip with logs.

[Toni Wilen]

Try without low latency vsync, it isn't tuned for d3d11 yet. Normal vsync should work much better with d3d11 than d3d9. (or uses d3d9 if you really need it)

[Octopus66]

Thanks for the suggestion, but unfortunately it has no impact. It's not a big deal as I use that config for productivity more than games so I can just stick with D3D9.

However I find your comment interesting as I have a save state which shows glitching for me using D3D9 low latency v sync no buffering which goes away using D3D11. Is this because D3D11 low latency v sync is not really low latency?

I have attached the save state. It is using Qwak and Alien Breed Twin CD and the issue is Alien Breed. With the save state when I move left and right the scrolling glitches at the top of the screen with D3D9, but not D3D11.