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atan2: replace min, max with x, y

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This commit is contained in:
Matt Huszagh 2020-12-17 11:39:32 -08:00
parent 9c5e68ceea
commit 17cf71f22b
1 changed files with 5 additions and 3 deletions
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8
dsp/src/trig.rs
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@ -48,9 +48,11 @@ pub fn atan2(y: i32, x: i32) -> i32 {
// //
// which is taken from Rajan 2006: Efficient Approximations for // which is taken from Rajan 2006: Efficient Approximations for
// the Arctangent Function. // the Arctangent Function.
let (min, max) = if y_greater { (x, y) } else { (y, x) }; if y_greater {
core::mem::swap(&mut x, &mut y);
}
if max == 0 { if x == 0 {
return 0; return 0;
} }
@ -61,7 +63,7 @@ pub fn atan2(y: i32, x: i32) -> i32 {
// number of atan argument bits beyond 15 because we must square // number of atan argument bits beyond 15 because we must square
// it. // it.
const ATAN_ARGUMENT_BITS: usize = 15; const ATAN_ARGUMENT_BITS: usize = 15;
let ratio = (min << ATAN_ARGUMENT_BITS) / max; let ratio = (y << ATAN_ARGUMENT_BITS) / x;
let mut angle = { let mut angle = {
const K1: i32 = ((1. / 4. + 0.285 / PI) const K1: i32 = ((1. / 4. + 0.285 / PI)