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 the angle whose trigonometric arctangent is or , depending on which overload is invoked. In the first overload, the signs of and are used to determine the quadrant that the angle lies in. The values returned by atan in this case are in the range . Results are undefined if is zero.
For the second overload, atan returns the angle whose tangent is . Values returned in this case are in the range .
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
| atan | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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