dx-graphics-hlsl-atan2.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
atan2 (Corecrt\_math.h)	Returns the arctangent of two values (x,y).	e7b53751-f321-4390-8f8f-ec1fa3aaa798	atan2 HLSL	apiref	atan2	corecrt_math.h	HeaderDef	reference	05/31/2018

atan2

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

ret atan2(y, x)

Parameters

Item	Description
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
y	same as input x	float	same dimension(s) as input x
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)	vs_1_1

Requirements

Requirement	Value
Header	Corecrt_math.h

See also

Intrinsic Functions (DirectX HLSL)