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atan2

Returns the arctangent of two values (x,y).

ret atan2(y, x)

 

Parameters

ItemDescription

y

[in] The y value.

x

[in] The x value.

 

Return Value

The arctangent of (y,x).

Remarks

The signs of the x and y parameters are used to determine the quadrant of the return values within the range of -Π to Π. The atan2 HLSL intrinsic function is well-defined for every point other than the origin, even if y equals 0 and x does not equal 0.

Type Description

Name Template Type Component Type Size
ysame as input x float same dimension(s) as input x
xscalar, vector, or matrix float any
retsame as input x float same dimension(s) as input x

 

Minimum Shader Model

This function is supported in the following shader models.

Shader ModelSupported
Shader Model 2 (DirectX HLSL) and higher shader modelsyes
Shader Model 1 (DirectX HLSL) vs_1_1

 

See also

Intrinsic Functions (DirectX HLSL)

 

 

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