From:http://developer.download.nvidia.com/CgTutorial/cg_tutorial_appendix_e.html
Mathematical Functions
| Func | Description |
|---|---|
| abs(x) | Absolute value of x . |
| acos(x) | Arccosine of x in range [0, p], x in [–1, 1]. |
| all(x) | Returns true if every component of x is not equal to 0. Returns false otherwise. |
| any(x) | Returns true if any component of x is not equal to 0. Returns false otherwise. |
| asin(x) | Arcsine of x in range [–p/2, p/2]; x should be in [–1, 1]. |
| atan(x) | Arctangent of x in range [–p/2, p/2]. |
| atan2(y,x) | Arctangent of y / x in range [–p, p]. |
| ceil(x) | Smallest integer not less than x . |