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Sped up splitting rays by direction.

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Turns out the is_sign_positive() method is slower than a simple
comparison.
This commit is contained in:
Nathan Vegdahl 2017-04-22 11:15:17 -07:00
parent 8b14e46bc1
commit 597bcf0518
1 changed files with 7 additions and 7 deletions
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14
src/tracer.rs
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@ -155,15 +155,15 @@ impl<'a> TracerInner<'a> {
fn split_rays_by_direction(rays: &mut [AccelRay]) -> [&mut [AccelRay]; 8] { fn split_rays_by_direction(rays: &mut [AccelRay]) -> [&mut [AccelRay]; 8] {
// | | | | | | | | | // | | | | | | | | |
// s1 s2 s3 s4 s5 s6 s7 // s1 s2 s3 s4 s5 s6 s7
let s4 = partition(&mut rays[..], |r| r.dir_inv.x().is_sign_positive()); let s4 = partition(&mut rays[..], |r| r.dir_inv.x() >= 0.0);
let s2 = partition(&mut rays[..s4], |r| r.dir_inv.y().is_sign_positive()); let s2 = partition(&mut rays[..s4], |r| r.dir_inv.y() >= 0.0);
let s6 = s4 + partition(&mut rays[s4..], |r| r.dir_inv.y().is_sign_positive()); let s6 = s4 + partition(&mut rays[s4..], |r| r.dir_inv.y() >= 0.0);
let s1 = partition(&mut rays[..s2], |r| r.dir_inv.z().is_sign_positive()); let s1 = partition(&mut rays[..s2], |r| r.dir_inv.z() >= 0.0);
let s3 = s2 + partition(&mut rays[s2..s4], |r| r.dir_inv.z().is_sign_positive()); let s3 = s2 + partition(&mut rays[s2..s4], |r| r.dir_inv.z() >= 0.0);
let s5 = s4 + partition(&mut rays[s4..s6], |r| r.dir_inv.z().is_sign_positive()); let s5 = s4 + partition(&mut rays[s4..s6], |r| r.dir_inv.z() >= 0.0);
let s7 = s6 + partition(&mut rays[s6..], |r| r.dir_inv.z().is_sign_positive()); let s7 = s6 + partition(&mut rays[s6..], |r| r.dir_inv.z() >= 0.0);
let (rest, rs7) = rays.split_at_mut(s7); let (rest, rs7) = rays.split_at_mut(s7);
let (rest, rs6) = rest.split_at_mut(s6); let (rest, rs6) = rest.split_at_mut(s6);