Re: [PATCH v5 0/2] MR184: vkd3d-shader/hlsl: Add support for SampleGrad() method

[Ethan Lee (＠flibitijibibo)]

On Fri Apr 28 13:17:02 2023 +0000, Giovanni Mascellani wrote:
> 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.

It doesn't make for a good pixel test (same issue as dsx/dsy where the values have to be something pretty specific to get interesting results), but changing the test to something like this at least shows that the `sample_d` instruction is getting its input from the right place:

```
SamplerState s;
Texture2D t;

float4 main() : sv_target
{
    return t.SampleGrad(s, float2(0.5, 0.5), float2(0.1, 0.2), float2(0.3, 0.4));
}
```