D2DSampleInput function

Samples input N at position uv. Only available for complex inputs.

Syntax

float4 WINAPI D2DSampleInput(
  in uint N,
  in float2 uv
);

Parameters

N [in]

The input number.

uv [in]

The uv position.

Return value

The function returns a float4, in the format TEXCOORDN.

Remarks

The following example shows the function being used to calculate surface normals.

   
float3 CalculateSurfaceNormal(TAPARGS)  
{  
    float3 normal = float3(0, 0, 1.0);  
  
    // unrolled loop  
    normal.xy += tap1.zw * D2DSampleInput(0, tap1.xy).a;  
    normal.xy += tap2.zw * D2DSampleInput(0, tap2.xy).a;  
    normal.xy += tap3.zw * D2DSampleInput(0, tap3.xy).a;  
    normal.xy += tap4.zw * D2DSampleInput(0, tap4.xy).a;  
    normal.xy += tap5.zw * D2DSampleInput(0, tap5.xy).a;  
    normal.xy += tap6.zw * D2DSampleInput(0, tap6.xy).a;  
  
    normal = normalize(normal);  
      
    return normal;  
}  

Requirements

Requirement	Value
Header	D2d1effecthelpers.hlsli
DLL	D2d1.dll

See also

Effect Shader Linking

HLSL Helpers