texture_view::gather_alpha Method

Samples the texture at the specified coordinates by using the specified sampling configuration and returns the alpha (w) components of the four sampled texels.

const gather_return_type gather_alpha(
   const sampler& _Sampler,
   const coordinates_type& _Coord
) const restrict(amp);

template<
   address_mode _Address_mode = address_clamp
>
const gather_return_type gather_alpha(
   const coordinates_type& _Coord
) const restrict(amp);

Parameters

• _Address_mode
  The address mode to use to sample the texture_view. The address mode is the same for all dimensions.

• _Sampler
  The sampler configuration to use to sample the texture_view.

• _Coord
  The coordinates to take the sample from. Fractional coordinate values are used to interpolate between sample texels.

Return Value

A rank 4 short vector containing the alpha (w) component of the 4 sampled texel values.

Requirements

Header: amp_graphics.h

Namespace: concurrency::graphics

See Also

Reference

texture_view Class