lerp

Performs a linear interpolation.

ret lerp(x, y, s)

Parameters

Item Description
x
[in] The first-floating point value.
y
[in] The second-floating point value.
s
[in] A value that linearly interpolates between the x parameter and the y parameter.

Return Value

The result of the linear interpolation.

Type Description

Name Template Type Component Type Size
x scalar, vector, or matrix float any
y same as input x float same dimension(s) as input x
s same as input x float same dimension(s) as input x
ret same as input x float same dimension(s) as input x

Remarks

Linear interpolation is based on the following formula: x*(1-s) + y*s which can equivalently be written as x + s(y-x).

Minimum Shader Model

This function is supported in the following shader models.

Shader Model Supported
Shader Model 2 (DirectX HLSL) and higher shader models yes
Shader Model 1 (DirectX HLSL) yes (vs_1_1 and ps_1_1)

See also

Intrinsic Functions (DirectX HLSL)