[HLSL] Option for treat all textures as texture arrays.

[konstantinegorov]

d3d does not provide the ability to specify an array slice when creating a non-arrayed texture view from an arrayed texture. If hlsl will treat all textures as texture arrays, the d3d limitation can be bypassed since I can always create an arrayed view with a single array slice:

d3d_view_desc->Dimension = TextureArray;
d3d_view_desc->TextureArray.MostDetailedMip = mip_level;
d3d_view_desc->TextureArray.MipLevels = mip_level_count;
d3d_view_desc->TextureArray.FirstArraySlice = array_slice;
d3d_view_desc->TextureArray.ArraySize = 1;

[HansKristian-Work]

I believe it is legal for HLSL Texture2D to map to a single-slice Texture2DArray.

[konstantinegorov]

It's not possible to map a slice of Texture2DArray to HLSL Texture2D, if array size > 1 and slice != 0;