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.

The result of the linear interpolation.

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

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

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)