sm5-object-texture2d-gatheralpha.md

title	description	ms.assetid	keywords	topic_type	api_name	api_type	ms.topic	ms.date	api_location
Texture2D::GatherAlpha(S,float,int) function	Returns the alpha components of the four texel values that would be used in a bi-linear filtering operation. | Texture2D::GatherAlpha(S,float,int) function	4c980e06-d768-479e-bee3-1b2541c23038	GatherAlpha function HLSL	apiref	GatherAlpha	NA	reference	05/31/2018

Texture2D::GatherAlpha(S,float,int) function

Returns the alpha components of the four texel values that would be used in a bi-linear filtering operation.

Syntax

TemplateType GatherAlpha(
  in sampler s,
  in float2 location,
  in int2 offset
);

Parameters

s [in]

Type: sampler

The zero-based sampler index.

location [in]

Type: float2

The sample coordinates (u,v).

offset [in]

Type: int2

An offset that is applied to the texture coordinate before sampling.

Return value

Type: TemplateType

A four-component value whose type is the same as the template type.

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

GatherAlpha methods

Shader Model 5