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 |
|
| DLL |
|