Add resonant filter plugin

This commit is contained in:
yaw-man 2022-08-21 22:37:33 -03:00
parent 48eb843cfa
commit 7c36a8bf98
5 changed files with 112 additions and 39 deletions

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@ -1,3 +1,4 @@
cmake_minimum_required(VERSION 3.10)
add_subdirectory(yaw-tab)
add_subdirectory(yaw-shepard)
add_subdirectory(yaw-vowel)

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@ -4,6 +4,7 @@ dpf_add_plugin(yaw-vowel
TARGETS vst2
FILES_DSP
dsp.cpp
filter.cpp
FILES_UI
wtutil.cpp
wintab.cpp

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@ -1,4 +1,5 @@
#include "DistrhoPlugin.hpp"
#include "filter.h"
START_NAMESPACE_DISTRHO
@ -7,7 +8,7 @@ class TabPlugin : public Plugin
public:
TabPlugin()
: Plugin(kParameterCount, 0, 0),
sampleRate(getSampleRate())
hzNyq(0.5 * getSampleRate())
{
// clear all parameters
std::memset(fParameters, 0, sizeof(float) * kParameterCount);
@ -15,13 +16,13 @@ public:
}
protected:
const char* getLabel() const override { return "yaw-tab"; }
const char* getLabel() const override { return "yaw-vowel"; }
const char* getDescription() const override { return "Drawing tablet synth UI"; }
const char* getMaker() const override { return "yaw-audio"; }
const char* getHomePage() const override { return "https://yaw.man/plugins/yaw-tab"; }
const char* getLicense() const override { return "ISC"; }
const char* getHomePage() const override { return "https://yaw.man/plugins/yaw-vowel"; }
const char* getLicense() const override { return "Fuck you pay me"; }
uint32_t getVersion() const override { return d_version(1, 0, 0); }
int64_t getUniqueId() const override { return d_cconst('y', 'w', 't', 'b'); }
int64_t getUniqueId() const override { return d_cconst('y', 'v', 'w', 'l'); }
void initParameter(uint32_t index, Parameter& parameter) override
@ -69,7 +70,7 @@ protected:
void sampleRateChanged(double newRate) override
{
sampleRate = newRate;
hzNyq = newRate / 2;
}
float getParameterValue(uint32_t index) const override
@ -80,49 +81,25 @@ protected:
void setParameterValue(uint32_t idx, float val) override
{
fParameters[idx] = val;
switch (idx) {
case ktpax:
period = 0.02f * val * static_cast<float>(sampleRate);
break;
case ktpay:
break;
case ktpaz:
break;
case ktpap:
volume = val;
break;
case kParameterButtonA:
break;
case kParameterButtonB:
break;
}
if( kParameterTime == idx ) return;
double x = (fParameters[ktpax] * 700.0 + 200.0) / (2.0 * hzNyq);
double y = (fParameters[ktpay] * 1900.0 + 500.0) / (2.0 * hzNyq);
double p = fParameters[ktpap];
filter.set(x, y, p);
}
void run(const float** inputs, float** outputs, uint32_t frames) override
{
for (uint32_t i = 0; i < frames; ++i) {
counter++;
if (counter > period) {
outputs[0][i] = outputs[1][i] = volume;
counter = 0;
}
else {
outputs[0][i] = outputs[1][i] = 0.0f;
}
}
filter.process(outputs, inputs, frames);
parity = !parity;
fParameters[kParameterTime] += parity ? 1 : -1;
}
private:
float fParameters[kParameterCount];
float period = 0.f;
float counter = 0.f;
float volume = 0.f;
double sampleRate;
double hzNyq;
bool parity = false;
Filter filter;
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(TabPlugin)
};

24
src/yaw-vowel/filter.cpp Normal file
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@ -0,0 +1,24 @@
#include "filter.h"
void Resonator::clear()
{
xp = xpp = yp = ypp = 0;
}
void Resonator::process(float* output, const float* const input, uint32_t frames)
{
for(uint32_t i = 0; i < frames; ++i){
float x = static_cast<float>(input[i] * scale);
float y = x - xpp - app * ypp + ap * yp;
output[i] = y;
xpp = xp;
xp = x;
ypp = yp;
yp = y;
}
}
void Resonator::set(double _app, double _ap, double _scale)
{
app = _app; ap = _ap; scale = _scale;
}

70
src/yaw-vowel/filter.h Normal file
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@ -0,0 +1,70 @@
#include "DistrhoPlugin.hpp"
#include <tuple>
#include <array>
class Resonator
{
public:
Resonator():
xp(0), xpp(0), yp(0), ypp(0), app(0), ap(0), scale(1){};
void process(float *output, const float *const input, uint32_t frames);
void clear();
void set(double _app, double _ap, double _scale);
private:
float xp;
float xpp;
float yp;
float ypp;
double app;
double ap;
double scale;
};
class Filter
{
public:
Filter(){};
void process(float **outputs, const float **inputs, uint32_t frames)
{
for (uint chn = 0; chn < 2; ++chn)
{
for (uint32_t j = 0; j < frames; ++j)
{
outputs[chn][j] = inputs[chn][j];
}
for (auto& r : res[chn])
{
r.process(outputs[chn], outputs[chn], frames);
}
}
}
//Compute filter coefficients from
//frequency as a proportion of the sample rate
//REMEMBER: THAT'S DOUBLE THE Nyquist RATE, dummy
//and resonance in [0, 1]
void set(double x, double y, double p)
{
double r = p * 0.99;
double app = r * r;
double xap = (1.0 + r * r) * cos(M_PI * x);
double yap = (1.0 + r * r) * cos(M_PI * y);
double scale = sqrt(0.5 - 0.5 * r * r);
for (auto& channelFilter : res)
{
channelFilter[0].set(app, xap, scale);
channelFilter[1].set(app, xap, scale);
channelFilter[2].set(app, yap, scale);
channelFilter[3].set(app, yap, scale);
}
}
private:
std::array<std::array<Resonator, 4>, 2> res;
};