--- layout: stdlib-reference --- # EvaluateAttributeSnapped ## Description Interpolates vertex attribute at the specified subpixel offset. ## Signature

T EvaluateAttributeSnapped<T>(
    T x,
    vector<int, 2> offset)
    where T : __BuiltinArithmeticType;

vector<T, N> EvaluateAttributeSnapped<T, N:int>(
    vector<T, N> x,
    vector<int, 2> offset)
    where T : __BuiltinArithmeticType;

matrix<T, N, M> EvaluateAttributeSnapped<T, N:int, M:int>(
    matrix<T, N, M> x,
    vector<int, 2> offset)
    where T : __BuiltinArithmeticType;

## Generic Parameters #### T: [\_\_BuiltinArithmeticType](../interfaces/0_builtinarithmetictype-029j/index.html) #### N : int #### M : int ## Parameters #### x : [T](evaluateattributesnapped-08h.html#typeparam-T) The vertex attribute to interpolate. #### offset : [vector](../types/vector/index.html)\ The subpixel offset. Each component is a 4-bit signed integer in range [-8, 7]. #### x : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The vertex attribute to interpolate. #### x : [matrix](../types/matrix/index.html)\<[T](../types/matrix/t-0.html), [N](../types/matrix/index.html#decl-N), [M](../types/matrix/index.html#decl-M)\> The vertex attribute to interpolate. ## Return value The interpolated attribute value. ## Remarks x must be a direct reference to a fragment shader varying input. The valid values of each component of offset are: - 1000 = -0.5f (-8 / 16) - 1001 = -0.4375f (-7 / 16) - 1010 = -0.375f (-6 / 16) - 1011 = -0.3125f (-5 / 16) - 1100 = -0.25f (-4 / 16) - 1101 = -0.1875f (-3 / 16) - 1110 = -0.125f (-2 / 16) - 1111 = -0.0625f (-1 / 16) - 0000 = 0.0f ( 0 / 16) - 0001 = 0.0625f ( 1 / 16) - 0010 = 0.125f ( 2 / 16) - 0011 = 0.1875f ( 3 / 16) - 0100 = 0.25f ( 4 / 16) - 0101 = 0.3125f ( 5 / 16) - 0110 = 0.375f ( 6 / 16) - 0111 = 0.4375f ( 7 / 16) ## Availability and Requirements Defined for the following targets: #### hlsl Available in stages: `amplification`, `fragment`, `compute`, `mesh`, `miss`, `callable`, `closesthit`, `raygen`, `intersection`, `anyhit`. #### glsl Available in stages: `amplification`, `fragment`, `compute`, `mesh`, `miss`, `callable`, `closesthit`, `raygen`, `intersection`, `anyhit`. #### spirv Available in stages: `amplification`, `fragment`, `compute`, `mesh`, `miss`, `callable`, `closesthit`, `raygen`, `intersection`, `anyhit`. Requires capabilities: `SPV_KHR_compute_shader_derivatives`, `spvMeshShadingEXT`.