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
|
use std::mem;
use super::*;
#[derive(Debug)]
pub struct Triangle {
pub freq: GenBox,
pub phase: f32,
pub buf: SampleBuffer,
}
impl Generator for Triangle {
fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
self.buf.rate = Rate::Sample;
let pvel = self.freq.eval(params).first() / params.env.sample_rate;
for i in 0..self.buf.len() {
let ph = (self.phase + pvel * (i as f32)) % 1.0;
self.buf[i] = if ph < 0.25 {
4.0 * ph
} else if ph > 0.75 {
4.0 * ph - 4.0
} else {
-4.0 * ph + 2.0
};
}
self.phase = (self.phase + pvel * (self.buf.len() as f32)) % 1.0;
&self.buf
}
fn buffer<'a>(&'a self) -> &'a SampleBuffer { &self.buf }
fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
mem::replace(&mut self.buf, buf)
}
}
pub struct TriangleFactory;
impl GeneratorFactory for TriangleFactory {
fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
Ok(Box::new(Triangle {
freq: params.remove_param("freq", 0)?.as_gen()?,
phase: params.get_param("phase", 1, &ParamValue::Float(0.0)).as_f32()?,
buf: SampleBuffer::new(params.env.default_buffer_size),
}))
}
}
pub static Factory: TriangleFactory = TriangleFactory;
|
