D2DSampleInputAtOffset function

Samples input N at an offset of offset from the input coordinate. Only available for complex inputs.

Syntax

float4 WINAPI D2DSampleInputAtOffset(
  in uint N,
  in float2 offset
);

Parameters

N [in]

The input number.

offset [in]

The uv offset.

Return value

The function returns a float4, in the format TEXCOORDN.

Remarks

The following example shows the function being used as part of a highlighting and shadows gradient mask.

  
D2D_PS_ENTRY(HighlightsAndShadowsGradientMask)  
{  
    MIN_TYPE(float4) blurred = D2DGetInput(0);  
  
    // Compute X and Y gradients 
    MIN_TYPE(float) dX1 = D2DSampleInputAtOffset(0, float2(1, 0));
    MIN_TYPE(float) dX2 = D2DSampleInputAtOffset(0, float2(-1, 0));
    MIN_TYPE(float) dY1 = D2DSampleInputAtOffset(0, float2(0, 1));
    MIN_TYPE(float) dY2 = D2DSampleInputAtOffset(0, float2(0, -1));
    
    // TODO: math to calculate shadow gradients

    // Return the value in the alpha channel.  
    blurred.a = // TODO: math to calculate blurred value
  
    return blurred;  
}  

Requirements

Requirement	Value
Header	D2d1effecthelpers.hlsli
DLL	D2d1.dll

See also

Effect Shader Linking

HLSL Helpers