[Bug 45975] DirectX 10 games no longer work with nVidia legacy driver.

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=45975

--- Comment #2 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to Alistair Leslie-Hughes from comment #0)
> Using glView, from Realtech VR, shows that the 8600 GT doesn't support
> ARB_POLYGON_OFFSET_CLAMP or infact any of the 4.6 standard GL functions. 
> Maybe DirectX does Depth Bias Clamping internally if the card doesn't
> support it or maybe its part of the 10.1+ standard.  No-one know for sure.
> 
> As Henri pointed out, it's not clear that Deapth Bais Clamping is actually a
> requirement for DirectX 10 but is rather implied based off
> https://docs.microsoft.com/en-us/windows/desktop/direct3d11/d3d10-graphics-
> programming-guide-output-merger-stage-depth-bias
> 
No, that's a misunderstanding. It's clear that DepthBiasClamp is a requirement
for Direct3D 10, MSDN just doesn't spell that out quite as clearly. It's also
clear that the hardware is capable of the functionality, the NVIDIA legacy
drivers for the GPU just don't expose that functionality because they became
"legacy" before supporting the OpenGL extension.

> It's now my understanding that if Depth Bais Clamping isn't supported then
> we may end up with minor Artefacts in some places, for some games.  I'm sure
> users can live with a little glitch now and again, if it means they can play
> games that they know their hardware is perfectly capable of running.
> 
That's certainly an acceptable hack for individual users, but not something
we'd want in upstream Wine.

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