wip: filter constructors

inc/BandPassFilter.h

@@ -1,12 +1,13 @@
 #pragma once
 #include "Filter.h"
 
-class BandPassFilter: public Filter
-{
-private:
+class BandPassFilter : public Filter {
+  private:
     void calculate_coefficients() override;
-public:
+
+  public:
+    BandPassFilter(Filter* filter);
+    BandPassFilter(float freq, float res, float q);
     BandPassFilter(/* args */);
     ~BandPassFilter();
 };
-

inc/Filter.h

@@ -1,18 +1,16 @@
 #pragma once
 #include "Effect.h"
 
-class Filter: public Effect
-{
-    
+class Filter : public Effect {
 
-protected:
+  protected:
     struct Normals {
         float V;
         float K;
     };
 
-    float m_freq; // cutoff frequency
-    float m_q; // filter quantity (resonance)
+    float m_freq;  // cutoff frequency
+    float m_q;     // filter quantity (resonance)
     float m_order; // filter order (peakGain)
     /* todo: filter adsr */
     float m_norm;
@@ -20,7 +18,8 @@ protected:
     float m_z1, m_z2;
     Normals calculate_normals();
     virtual void calculate_coefficients(){};
-public:
+
+  public:
     Filter(/* args */);
     ~Filter();
     void Trigger() override;
@@ -28,5 +27,7 @@ public:
     float Process(float in);
     void Process(std::vector<float>& samples) override;
     void SetParameters(float freq, float res, float q);
+    float GetFreq() { return m_freq; }
+    float GetRes() { return m_q; }
+    float GetPeakGain() { return m_norm; }
 };
-

inc/HighPassFilter.h

@@ -1,12 +1,13 @@
 #pragma once
 #include "Filter.h"
 
-class HighPassFilter: public Filter
-{
-private:
+class HighPassFilter : public Filter {
+  private:
     void calculate_coefficients() override;
-public:
-    HighPassFilter(/* args */);
+
+  public:
+    HighPassFilter();
+    HighPassFilter(Filter* filter);
+    HighPassFilter(float freq, float res, float q);
     ~HighPassFilter();
 };
-

inc/LowPassFilter.h

@@ -2,12 +2,13 @@
 
 #include "Filter.h"
 
-class LowPassFilter: public Filter
-{
-protected:
+class LowPassFilter : public Filter {
+  protected:
     void calculate_coefficients() override;
-public:
-    LowPassFilter(/* args */);
+
+  public:
+    LowPassFilter();
+    LowPassFilter(Filter* filter);
+    LowPassFilter(float freq, float res, float q);
     ~LowPassFilter();
 };
-

src/BandPassFilter.cpp

@@ -1,10 +1,16 @@
 #include "BandPassFilter.h"
 
-BandPassFilter::BandPassFilter(/* args */) {
+BandPassFilter::BandPassFilter(/* args */) {}
+
+BandPassFilter::BandPassFilter(Filter* filter) {
+    m_freq = filter->GetFreq();
+    m_q = filter->GetRes();
+    m_order = filter->GetPeakGain();
 }
 
-BandPassFilter::~BandPassFilter() {
-}
+BandPassFilter::BandPassFilter(float freq, float res, float q) {}
+
+BandPassFilter::~BandPassFilter() {}
 
 void BandPassFilter::calculate_coefficients() {
     Filter::Normals base = calculate_normals();

src/Filter.cpp

@@ -1,11 +1,9 @@
 #include "Filter.h"
 #include "Settings.h"
 
-Filter::Filter(/* args */) {
-}
+Filter::Filter(/* args */) {}
 
-Filter::~Filter() {
-}
+Filter::~Filter() {}
 
 Filter::Normals Filter::calculate_normals() {
     Filter::Normals res;
@@ -15,11 +13,9 @@ Filter::Normals Filter::calculate_normals() {
     return res;
 }
 
-void Filter::Trigger() {
-}
+void Filter::Trigger() {}
 
-void Filter::Release() {
-}
+void Filter::Release() {}
 
 float Filter::Process(float in) {
     float out = in * m_a0 + m_z1;
@@ -29,8 +25,9 @@ float Filter::Process(float in) {
 }
 
 void Filter::Process(std::vector<float>& samples) {
-    // todo: that will not work for ADSR-controlled filter. So, let's calculate all the possible frequency values into array/dictionary
-    // then just lookup for each sample
+    // todo: that will not work for ADSR-controlled filter. So, let's calculate
+    // all the possible frequency values into array/dictionary then just lookup
+    // for each sample
     calculate_coefficients();
     for (std::size_t i = 0; i < samples.size(); i++) {
         samples[i] = Process(samples[i]);

src/HighPassFilter.cpp

@@ -1,10 +1,16 @@
 #include "HighPassFilter.h"
 
-HighPassFilter::HighPassFilter(/* args */) {
+HighPassFilter::HighPassFilter(/* args */) {}
+
+HighPassFilter::HighPassFilter(Filter* filter) {
+    m_freq = filter->GetFreq();
+    m_q = filter->GetRes();
+    m_order = filter->GetPeakGain();
 }
 
-HighPassFilter::~HighPassFilter() {
-}
+HighPassFilter::HighPassFilter(float freq, float res, float q) {}
+
+HighPassFilter::~HighPassFilter() {}
 
 void HighPassFilter::calculate_coefficients() {
     Filter::Normals base = calculate_normals();

src/LowPassFilter.cpp

@@ -1,16 +1,27 @@
 #include "LowPassFilter.h"
 #include "Settings.h"
 
-LowPassFilter::LowPassFilter(/* args */) {
-    //todo: defaults
+LowPassFilter::LowPassFilter() {
+    // todo: defaults
     m_freq = 200.f / SAMPLE_RATE;
-    m_q = 0.707; 
+    m_q = 0.707f;
     m_order = 0;
 }
 
-LowPassFilter::~LowPassFilter() {
+LowPassFilter::LowPassFilter(float freq, float res, float q) {
+    m_freq = freq / SAMPLE_RATE;
+    m_q = res;
+    m_order = q;
 }
 
+LowPassFilter::LowPassFilter(Filter* filter) {
+    m_freq = filter->GetFreq();
+    m_q = filter->GetRes();
+    m_order = filter->GetPeakGain();
+}
+
+LowPassFilter::~LowPassFilter() {}
+
 void LowPassFilter::calculate_coefficients() {
     Filter::Normals base = calculate_normals();
     m_norm = 1 / (1 + base.K / m_q + base.K * base.K);