Texture2DArray::GatherCmpAlpha(S,float,float,int) function
For four texel values that would be used in a bi-linear filtering operation, returns a comparison of their alpha component against a compare value.
Syntax
float4 GatherCmpAlpha(
in SamplerComparisonState s,
in float3 location,
in float compare_value,
in int2 offset
);
Parameters
-
s [in]
-
Type: SamplerComparisonState
The zero-based sampler index.
-
location [in]
-
Type: float3
The sample coordinates (u,v).
-
compare_value [in]
-
Type: float
A value to compare each against each sampled value.
-
offset [in]
-
Type: int2
An offset that is applied to the texture coordinate before sampling.
Return value
Type: float4
A four-component value, each component is the result of a per-component comparison.
Remarks
The texture samples can be used for bilinear interpolation.
This function is supported for the following types of shaders:
| Vertex | Hull | Domain | Geometry | Pixel | Compute |
|---|---|---|---|---|---|
| x | x | x | x | x | x |
See also