atan — return the arc-tangent of the parameters
genType atan(
|
genType y, |
genType x); |
genType atan(
|
genType y_over_x); |
y
Specify the numerator of the fraction whose arctangent to return.
x
Specify the denominator of the fraction whose arctangent to return.
y_over_x
Specify the fraction whose arctangent to return.
atan returns either the angle whose
trigonometric arctangent is $y \over x$ or
y_over_x, depending on which overload is
invoked. In the first overload, the signs of $y$ and $x$ are
used to determine the quadrant that the angle lies in. The value
returned by atan in this case is in the
range $[-\pi,\pi]$. The result is undefined if $x = 0$.
For the second overload, atan returns the
angle whose tangent is y_over_x. The
value returned in this case is in the range
$[-{\pi \over 2 },{\pi \over 2}]$.
| OpenGL ES Shading Language Version | ||||
|---|---|---|---|---|
| Function Name | 1.00 | 3.00 | 3.10 | 3.20 |
| atan | ✔ | ✔ | ✔ | ✔ |
Copyright © 2011-2015 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.