Returns the reciprocal of the square root of the specified value.

ret rsqrt(x)


Item Description
[in] The specified value.

Return Value

The reciprocal of the square root of the x parameter.


This function uses the following formula: 1 / sqrt(x).

Type Description

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

See also

Intrinsic Functions (DirectX HLSL)