[PATCH 1/2] d3d9/tests: Test stencil reference truncation.

[Paul Gofman]

Stencil mask is supposed to be used with reference value on comparison
according to MSDN [1] (which of course does not guarantee that it is the
case on Windows). I've modified your test a bit to show that it is
really the case, the modified test succeeds for me on Windows 7, Nvidia
or Intet GPU. HP (see attached, to be applied after your patches). But
it also succeeds in Wine with your modifications to wined3d (after
removing AND with the mask). Which probably means that:
- Opengl applies the mask to ref value as it is supposed to ([2]);
- ref value is probably not clamped to stencil buffer range for
comparison while it looks so in native d3d9;
- Stencil mask is ignored when storing ref value to stencil buffer both
in opengl and d3d9.

I also tested that Test Drive Unlimited glitch (which was fixed by
a9e199e5ad76c0540381f25011d6051ace3e7c0a) does not reappear after your
patches.

1.
https://docs.microsoft.com/en-us/windows/win32/direct3d9/d3drenderstatetype,
description for D3DRS_STENCILMASK.
2.
https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glStencilFuncSeparate.xhtml,
description for 'mask' parameter.


On 8/21/19 12:46, Zhiyi Zhang wrote:
> This proves that stencil reference got truncated
> instead of ANDed with stencil mask.
>
> Signed-off-by: Zhiyi Zhang <zzhang at codeweavers.com>
> ---

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