Veldrid renderer is broken on Windows 8.1, DirectX 11

Seems like ppy/veldrid repo is a bit empty so I’ll post here.

Testing on Windows 8.1, i3-3217U with integrated HD Graphics 4000. Windows 10 does not have this problem, so for now hardware is irrelevant.

Made a minimal project with only bare minimums to get veldrid working. Details will be provided below.

With peppy fork of veldrid it crashes with exception:

SharpGen.Runtime.SharpGenException: HRESULT: [0x80004002], Module: [General], ApiCode: [E_NOINTERFACE/No such interface supported], Message: [No such interface supported]

Not quite helpful, huh?

This is the exact same error that osu crashed with on D3D11 Veldrid. This does NOT happen with the original veldrid, so some changes we made have broken it on Win8.1

[smoogipoo]

Also, seems like IDXGIFactory5 does not exists in Win8.1, thus crashing everything when we try to check if allow tearing is supported using the method inside it.

That’s very unfortunate. I half-expected GetParent<T>() to not throw, given that GetParent(out T? val) returns a nullable (and doesn’t throw). Probably the way to do this is _gd.Adapter.CheckInterfaceSupport<T>(). There should be no need to try-catch.

Are you able to test this?

[Joehuu]

all 4.9.0 from ppy/veldrid works. Crashes start from 4.9.1.

Last working commit is ppy/veldrid@043cf33

It is best to link the bad commit next time: https://github.com/ppy/veldrid/commit/0351daefbdedda1af15bfa2eb2801d8fcd4f90bc.

Looking at https://learn.microsoft.com/en-us/windows/win32/api/dxgi/ne-dxgi-dxgi_swap_effect#constants, it seems that DXGI_SWAP_EFFECT_FLIP_DISCARD is only supported on Windows 10+.