atan — return the arc-tangent of the parameters
Specify the numerator of the fraction whose arctangent to return.
Specify the denominator of the fraction whose arctangent to return.
Specify the fraction whose arctangent to return.
atan returns the angle whose trigonometric arctangent is
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
returned in this case are in the range
|OpenGL ES Shading Language Version|
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