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SampleGrad::SampleGrad(S,float,float,float,int,float,uint) function for Texture2D

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Samples a Texture2D, using a gradient to influence the way the sample location is calculated, with an optional value to clamp sample level-of-detail (LOD) values to. Returns status about the operation.

Syntax

DXGI_FORMAT SampleGrad(
  in  SamplerState S,
  in  float        Location,
  in  float        DDX,
  in  float        DDY,
  in  int          Offset,
  in  float        Clamp,
  out uint         Status
);

Parameters

S [in]

Type: SamplerState

A Sampler state. This is an object declared in an effect file that contains state assignments.

Location [in]

Type: float

The texture coordinates. The argument type is dependent on the texture-object type.

Texture-Object Type Parameter Type
Texture1D float
Texture1DArray, Texture2D float2
Texture2DArray, Texture3D, TextureCube float3
TextureCubeArray float4

 

DDX [in]

Type: float

The rate of change of the surface geometry in the x direction. The argument type is dependent on the texture-object type.

Texture-Object Type Parameter Type
Texture1D, Texture1DArray float
Texture2D, Texture2DArray float2
Texture3D, TextureCube, TextureCubeArray float3
Texture2DMS, Texture2DMSArray not supported

 

DDY [in]

Type: float

The rate of change of the surface geometry in the y direction. The argument type is dependent on the texture-object type.

Texture-Object Type Parameter Type
Texture1D, Texture1DArray float
Texture2D, Texture2DArray float2
Texture3D, TextureCube, TextureCubeArray float3
Texture2DMS, Texture2DMSArray not supported

 

Offset [in]

Type: int

An optional texture coordinate offset, which can be used for any texture-object type; the offset is applied to the location before sampling. Use an offset only at an integer miplevel; otherwise, you may get results that do not translate well to hardware. The argument type is dependent on the texture-object type. For more info, see Applying Integer Offsets.

Texture-Object Type Parameter Type
Texture1D, Texture1DArray int
Texture2D, Texture2DArray int2
Texture3D int3
TextureCube, TextureCubeArray not supported

 

Clamp [in]

Type: float

An optional value to clamp sample LOD values to. For example, if you pass 2.0f for the clamp value, you ensure that no individual sample accesses a mip level less than 2.0f.

Status [out]

Type: uint

The status of the operation. You can't access the status directly; instead, pass the status to the CheckAccessFullyMapped intrinsic function. CheckAccessFullyMapped returns TRUE if all values from the corresponding Sample, Gather, or Load operation accessed mapped tiles in a tiled resource. If any values were taken from an unmapped tile, CheckAccessFullyMapped returns FALSE.

Return value

Type: DXGI_FORMAT

The texture format, which is one of the typed values listed in DXGI_FORMAT.

See also

SampleGrad methods