Basic texture array usage in shaders in Unity 5.4

TextureArray.md

You generally want this compilation target:

// uses texture arrays, so needs DX10/ES3 which is 3.5 target
#pragma target 3.5

Inside Properties block: _MyArr ("Tex", 2DArray) = "" {}

Declare the texture array sampler inside CGPROGRAM: UNITY_DECLARE_TEX2DARRAY(_MyArr);

Sample it: half4 col = UNITY_SAMPLE_TEX2DARRAY(_MyArr, uv); // uv is float3, .z is the slice

In case of surface shaders, you can use something like

#ifndef SHADER_TARGET_SURFACE_ANALYSIS
UNITY_DECLARE_TEX2DARRAY(_RGBS);
#endif 

something like UNITY_SAMPLE_TEX2DARRAY_GRAD would be great as UNITY_SAMPLE_TEX2DARRAY_LOD unfortunately produces blurry and noisy results

Seconded on a _GRAD variant; could really use that right now..

@dkyeck: What I'm seeing is that the results of using UNITY_SAMPLE_TEX2DARRAY_LOD look decent on OSX, but on Windows machines shimmer like mad, as if it's always sampling the highest mip level.