1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
ix!();
impl crate::AbstractBlitter {
#[inline] pub fn update_out_attenuation(&mut self) {
self.out_attenuation_inv = self.n_unison as f32;
self.out_attenuation = 1.0 / self.out_attenuation_inv;
}
#[inline] pub fn prepare_single_voice(&mut self) {
self.detune_bias = 1.0;
self.detune_offset = 0.0;
self.pan_l[0] = 1.0;
self.pan_r[0] = 1.0;
}
#[inline] pub fn prepare_multi_voice(&mut self, voices: usize) {
self.detune_bias = 2.0 / (self.n_unison as f32 - 1.0);
self.detune_offset = -1.0;
let odd: bool = (voices & 1) != 0;
let mid: f32 = (voices as f32) * 0.5 - 0.5;
let half: usize = voices >> 1;
for i in 0..voices {
let mut d: f32 = (i as f32 - mid).abs() / mid;
if odd && (i >= half) {
d = -d;
}
if (i & 1) != 0 {
d = -d;
}
self.pan_l[i] = 1.0 - d;
self.pan_r[i] = 1.0 + d;
}
}
pub fn prepare_unison(&mut self, voices: usize) {
self.update_out_attenuation();
match voices {
1 => self.prepare_single_voice(),
_ => self.prepare_multi_voice(voices),
}
}
}