oscillation 0.1.1

Oscillators and a collection of waveforms for real-time usage.
Documentation 
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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

use num_traits::{Float, FloatConst};

use crate::{waveform::Waveform, Wavetable, WavetableView};

use super::{Direct, DirectDTC, OscillatorState, Wave};

#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord, serde::Serialize, serde::Deserialize)]
pub struct WaveDTC<F, W, const N: usize>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    pub waveform: W,
    pub duty_cycle: F,
    #[serde(skip)]
    wavetable: Option<Option<Wavetable<F, N>>>
}

impl<F, W, const N: usize> From<W> for WaveDTC<F, W, N>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    fn from(waveform: W) -> Self
    {
        Direct::from(waveform).into()
    }
}
impl<F, W, const N: usize> From<Direct<W>> for WaveDTC<F, W, N>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    fn from(value: Direct<W>) -> Self
    {
        DirectDTC::from(value).into()
    }
}
impl<F, W, const N: usize> From<DirectDTC<F, W>> for WaveDTC<F, W, N>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    fn from(value: DirectDTC<F, W>) -> Self
    {
        let DirectDTC {waveform, duty_cycle} = value;
        Self {
            waveform,
            duty_cycle,
            wavetable: None
        }
    }
}
impl<F, W, const N: usize> From<Wave<F, W, N>> for WaveDTC<F, W, N>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    fn from(value: Wave<F, W, N>) -> Self
    {
        value.with_dtc(crate::duty_cycle_default())
    }
}

impl<F, W, const N: usize> OscillatorState<F> for WaveDTC<F, W, N>
where
    F: Float + FloatConst,
    W: Waveform<F>
{
    type Waveform = W;

    type WithDTC = WaveDTC<F, W, N>;
    type WithoutDTC = Wave<F, W, N>;

    type WithWavetable<const NN: usize> = WaveDTC<F, W, NN>;
    type WithoutWavetable = DirectDTC<F, W>;

    type WithWaveform<WW> = WaveDTC<F, WW, N>
    where
        WW: Waveform<F>;

    fn next(&mut self, theta: F, omega: F, rate: F) -> F
    {
        let zero = F::zero();
        let pi = F::PI();
        let nyq = pi*rate;
        if nyq <= omega
        {
            return zero
        }

        if N != 0
            && let up_to = (nyq/omega).abs().to_usize().unwrap_or(N)
            && up_to <= N
            && let Some(wavetable) = self.wavetable.get_or_insert_with(|| self.waveform.wavetable_with_dtc(self.duty_cycle))
            && let Some(y) = wavetable.waveform(theta, up_to)
        {
            y
        }
        else
        {
            self.waveform.waveform_with_dtc(theta, self.duty_cycle)
        }
    }

    fn duty_cycle(&self) -> F
    {
        self.duty_cycle
    }

    fn wavetable(&self) -> Option<WavetableView<'_, F>>
    {
        self.wavetable.as_ref().and_then(|w| w.as_ref().map(Wavetable::view))
    }

    fn waveform(&self) -> &Self::Waveform
    {
        &self.waveform
    }
    fn waveform_mut(&mut self) -> &mut Self::Waveform
    {
        &mut self.waveform
    }

    fn with_dtc(self, duty_cycle: F) -> Self::WithDTC
    {
        self.without_wavetable().with_dtc(duty_cycle).with_wavetable()
    }
    fn without_dtc(self) -> Self::WithoutDTC
    {
        self.without_wavetable().without_dtc().with_wavetable()
    }

    fn with_wavetable<const NN: usize>(self) -> Self::WithWavetable<NN>
    {
        let Self {waveform, duty_cycle, wavetable} = self;
        WaveDTC {
            waveform,
            duty_cycle,
            wavetable: wavetable.map(|w| w.and_then(Wavetable::truncate))
        }
    }
    fn without_wavetable(self) -> Self::WithoutWavetable
    {
        let Self {waveform, duty_cycle, wavetable: _} = self;
        DirectDTC {
            waveform,
            duty_cycle
        }
    }

    fn map_waveform<WW>(self, waveform: impl FnOnce(Self::Waveform) -> WW) -> Self::WithWaveform<WW>
    where
        WW: Waveform<F>
    {
        self.without_wavetable().map_waveform(waveform).with_wavetable()
    }
}