Gordonjcp
/
peacock
1
0
Fork 0
Code Issues 6 Pull Requests Packages Projects Releases Wiki Activity

add basics of voice definitions and module

This commit is contained in:
Gordon JC Pearce 2025-12-17 22:06:09 +00:00
parent aa9448cac5
commit 8c66392e97
4 changed files with 191 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
plugin/Makefile
View File

@ -11,6 +11,8 @@ NAME = peacock
FILES_DSP = \ FILES_DSP = \
assigner.cpp \ assigner.cpp \
module.cpp \
voice.cpp \
peacock.cpp peacock.cpp
include ../dpf/Makefile.plugins.mk include ../dpf/Makefile.plugins.mk

23
plugin/module.cpp Normal file
View File

@ -0,0 +1,23 @@
/*
Peacock-8 VA polysynth
Copyright 2025 Gordon JC Pearce <gordonjcp@gjcp.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "module.hpp"
Module::Module() {
}

73
plugin/module.hpp Normal file
View File

@ -0,0 +1,73 @@
/*
Peacock-8 VA polysynth
Copyright 2025 Gordon JC Pearce <gordonjcp@gjcp.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MODULE_HPP
#define _MODULE_HPP
#include <stdint.h>
#include "DistrhoPluginInfo.h"
class Module {
public:
Module();
//Voice voices[NUM_VOICES];
float vcfCutoff = 0, vcfReso = 0;
// precomputed values for all voices
float pw, saw, square, sub;
struct {
uint8_t lfoRate = 0x30; // lookup value defaults to 0x0200
uint8_t lfoDelay = 0x00;
uint8_t vcoLfo = 0x0a;
uint8_t pwmLfo = 0x30;
uint8_t noise = 0x00;
uint8_t vcfFreq = 0x3c; // 0x3f80
uint8_t vcfReso = 0x00;
uint8_t vcfEnv = 0x2e;
uint8_t vcfLfo = 0;
uint8_t vcfKey = 0x47;
uint8_t vca = 0x28;
uint8_t env_a = 0x1b;
uint8_t env_d = 0x39;
uint8_t env_s = 0x39; // 0x3f80
uint8_t env_r = 0x30;
uint8_t sub = 0x00;
uint8_t switch1 = 0x1a;
uint8_t switch2 = 0x18;
} patchRam;
};
class Voice {
public:
Voice();
void on(uint8_t note);
void off();
void run(Module *m, float *buffer, uint32_t samples);
private:
float omega = 0, theta = 0; // phase increment and angle
float delay = 0, lastpw = 0; // delay slots for antialiasing
uint8_t pulseStage = 1; // pulse wave phase
float subosc = 1; // sub oscillator flipflop output
float amp = 0; // output amplitude
};
#endif

93
plugin/voice.cpp Normal file
View File

@ -0,0 +1,93 @@
/*
Peacock-8 VA polysynth
Copyright 2025 Gordon JC Pearce <gordonjcp@gjcp.net>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <math.h>
#include "module.hpp"
// antialiasing using polybleps, as described in KVRAudio forum by Mystran
static inline float poly3blep0(float t) {
float t2 = t * t;
return t * t2 - 0.5f * t2 * t2;
}
static inline float poly3blep1(float t) {
return -poly3blep0(1 - t);
}
Voice::Voice() {
omega = 0.0;
theta = 0.0;
amp = 0;
}
void Voice::on(uint8_t note) {
omega = 261.63 * powf(2, (note - 60) / 12.0f) / 48000.0f;
amp = 1;
}
void Voice::off() {
amp = 0;
}
void Voice::run(Module *m, float* buffer, uint32_t samples) {
// carry out per-voice calculations for each block of samples
float out, t;
for (uint32_t i = 0; i < samples; i++) {
out = delay;
delay = 0;
theta += omega;
while (true) {
if (pulseStage == 0) {
if (theta < m->pw) break;
t = (theta - m->pw) / (lastpw - m->pw + omega);
out -= poly3blep0(t) * m->square;
delay -= poly3blep1(t) * m->square;
pulseStage = 1;
}
if (pulseStage == 1) {
if (theta < 1) break; // no need to blep yet
t = (theta - 1) / omega; // scaled remainder of phase
out += poly3blep0(t) * (m->saw + m->square);
delay += poly3blep1(t) * (m->saw + m->square);
out -= poly3blep0(t) * (m->sub * subosc);
delay -= poly3blep1(t) * (m->sub * subosc);
pulseStage = 0;
subosc = -subosc;
theta -= 1;
}
}
delay += m->saw * (1 - (2 * theta));
delay += m->square * (pulseStage ? -1.f : 1.f);
delay += m->sub * subosc;
// delay += (1-(m->noisegen/(float)(1<<30))) * m->noise; FIXME figure out what to do about noise
buffer[i] = 0.125 * amp * out;
lastpw = m->pw;
}
}