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
|
/**
bespoke synth, a software modular synthesizer
Copyright (C) 2021 Ryan Challinor (contact: awwbees@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
//
// Oscillator.cpp
// Bespoke
//
// Created by Ryan Challinor on 7/3/14.
//
//
#include "Oscillator.h"
float Oscillator::Value(float phase) const
{
if (mType == kOsc_Tri)
phase += .5f * FPI; //shift phase to make triangle start at zero instead of 1, to eliminate click on start
if (mShuffle > 0)
{
phase = fmod(phase, FTWO_PI * 2);
float shufflePoint = FTWO_PI * (1 + mShuffle);
if (phase < shufflePoint)
phase = phase / (1 + mShuffle);
else
phase = (phase - shufflePoint) / (1 - mShuffle);
}
phase = fmod(phase, FTWO_PI);
float sample = 0;
switch (mType)
{
case kOsc_Sin:
sample = sin(phase);
break;
case kOsc_Saw:
sample = SawSample(phase);
break;
case kOsc_NegSaw:
sample = -SawSample(phase);
break;
case kOsc_Square:
if (mSoften == 0)
{
sample = phase > (FTWO_PI * mPulseWidth) ? -1 : 1;
}
else
{
float phase01 = phase / FTWO_PI;
phase01 += .75f;
phase01 -= (mPulseWidth - .5f) / 2;
phase01 -= int(phase01);
sample = ofClamp((fabs(phase01 - .5f) * 4 - 1 + (mPulseWidth - .5f) * 2) / mSoften, -1, 1);
}
break;
case kOsc_Tri:
sample = fabs(phase / FTWO_PI - .5f) * 4 - 1;
break;
case kOsc_Random:
sample = ofRandom(-1, 1);
break;
default:
//assert(false);
break;
}
if (mType != kOsc_Square && mPulseWidth != .5f)
sample = (Bias(sample / 2 + .5f, mPulseWidth) - .5f) * 2; //give "pulse width" to non-square oscillators
return sample;
}
float Oscillator::SawSample(float phase) const
{
phase /= FTWO_PI;
if (mSoften == 0)
return phase * 2 - 1;
if (phase < 1 - mSoften)
return phase / (1 - mSoften) * 2 - 1;
return 1 - ((phase - (1 - mSoften)) / mSoften * 2);
}
|
