Re: [PATCH v3 0/2] MR184: vkd3d-shader/hlsl: Add support for SampleGrad() method

[Giovanni Mascellani (＠giomasce)]

Giovanni Mascellani (@giomasce) commented about tests/sampler.shader_test:
> [test]
>  draw quad
>  probe all rgba (0.25, 0, 0.25, 0)
> -
>
> +[pixel shader]
> +SamplerState s;
> +Texture2D t;
> -
>
> +float4 main() : sv_target
> +{
> - return t.SampleGrad(s, float2(0.5, 0.5), float2(0, 0), float2(0, 0));

Given this is a relatively complex operation, it wouldn't be bad to test some less trivial input values and check that our implementation is reasonably similar to native.