Re: [PATCH 0/2] MR161: vkd3d-shader/hlsl: Implement D3DCOLORtoUBYTE4().

[Giovanni Mascellani (＠giomasce)]

Giovanni Mascellani (@giomasce) commented about tests/hlsl-trunc.shader_test:
> +[test]
> +uniform 0 float4 -0.5 6.5 7.5 3.4
> +draw quad
> +probe all rgba (0.0, 6.0, 7.0, 3.0) 4
> +uniform 0 float4 -1.5 6.5 7.5 3.4
> +draw quad
> +probe all rgba (-1.0, 6.0, 7.0, 3.0) 4
> -
>
> +[pixel shader]
> +float4 main(uniform float4 u) : sv_target
> +{
> - float a = trunc(u.r);
> - int2 b = trunc(u.gb);
> - float4 res = float4(b, a, u.a);
> - return floor(res);
>
> +}

I wonder what's the reason for such a complicated test. It seems that the tests for `floor()` already had something like that, but I don't completely understand what's the value.