| 380 | |
| 381 | |
| 382 | float atanFast(float x) |
| 383 | { |
| 384 | // remove two test will limit the input range but makes it even faster. |
| 385 | if ( x > 1) return ( M_PI / 2) - atanHelper(1.0 / x); |
| 386 | if ( x < -1) return (-M_PI / 2) - atanHelper(1.0 / x); |
| 387 | return atanHelper(x); |
| 388 | } |
| 389 | |
| 390 | |
| 391 | inline float atanHelper(float x) |