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Save two multiplications

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est31 2019-08-09 21:10:09 +02:00
parent a15ca2b43e
commit fb5d8eb9d8
1 changed files with 10 additions and 9 deletions
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19
src/source/spatial.rs
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@ -15,11 +15,10 @@ where
input: ChannelVolume<I>,
}
fn dist(a: [f32; 3], b: [f32; 3]) -> f32 {
fn dist_sq(a: [f32; 3], b: [f32; 3]) -> f32 {
a.iter().zip(b.iter())
.map(|(a, b)| (a - b) * (a - b))
.sum::<f32>()
.sqrt()
}
impl<I> Spatial<I>
@ -45,13 +44,15 @@ where
pub fn set_positions(
&mut self, emitter_pos: [f32; 3], left_ear: [f32; 3], right_ear: [f32; 3],
) {
let left_distance = dist(left_ear, emitter_pos);
let right_distance = dist(right_ear, emitter_pos);
let max_diff = dist(left_ear, right_ear);
let left_diff_modifier = ((left_distance - right_distance) / max_diff + 1.0) / 4.0 + 0.5;
let right_diff_modifier = ((right_distance - left_distance) / max_diff + 1.0) / 4.0 + 0.5;
let left_dist_modifier = (1.0 / left_distance.powi(2)).min(1.0);
let right_dist_modifier = (1.0 / right_distance.powi(2)).min(1.0);
let left_dist_sq = dist_sq(left_ear, emitter_pos);
let right_dist_sq = dist_sq(right_ear, emitter_pos);
let max_diff = dist_sq(left_ear, right_ear).sqrt();
let left_dist = left_dist_sq.sqrt();
let right_dist = right_dist_sq.sqrt();
let left_diff_modifier = ((left_dist - right_dist) / max_diff + 1.0) / 4.0 + 0.5;
let right_diff_modifier = ((right_dist - left_dist) / max_diff + 1.0) / 4.0 + 0.5;
let left_dist_modifier = (1.0 / left_dist_sq).min(1.0);
let right_dist_modifier = (1.0 / right_dist_sq).min(1.0);
self.input
.set_volume(0, left_diff_modifier * left_dist_modifier);
self.input