Created ladder filter droplet

src/droplets/ad_droplet.cpp

@@ -219,3 +219,5 @@ void ADDroplet::UpdateStateCallback() {
   delete title_graph;
   CreateTitleGraph();
 }
+
+void ADDroplet::SetControls() {}

src/droplets/ad_droplet.h

@@ -155,6 +155,11 @@ public:
    * Runs when droplet state is updated.
    */
   void UpdateStateCallback();
+
+  /*
+   * Set up the controls for the droplet.
+   */
+  void SetControls();
 };
 
 #endif // DROPLETS_AD_DROPLET_H_

src/droplets/droplet.cpp

@@ -55,6 +55,7 @@ void Droplet::UpdateState(DropletState m_state) {
     chn_min = 2;
     screen_min = SSD1309_WIDTH / 2;
   }
+  SetControls();
   UpdateStateCallback();
 }
 

src/droplets/droplet.h

@@ -66,6 +66,11 @@ public:
    */
   virtual void UpdateStateCallback() {}
 
+  /*
+   * Set up the controls for the droplet.
+   */
+  virtual void SetControls() {}
+
   /*
    * Returns patch.
    *

src/droplets/ladder_filter_droplet.cpp

@@ -0,0 +1,47 @@
+#include "ladder_filter_droplet.h"
+
+LadderFilterDroplet::LadderFilterDroplet(DaisyPatch* m_patch,
+					 DropletState m_state,
+					 float sample_rate) :
+  Droplet(m_patch,
+	  m_state) {
+  filter.Init(sample_rate);
+
+  SetControls();
+}
+
+void LadderFilterDroplet::Control() {}
+
+void LadderFilterDroplet::Process(AudioHandle::InputBuffer in,
+			   AudioHandle::OutputBuffer out,
+			   size_t size) {
+  freq = freq_ctrl.Process();
+  res = res_ctrl.Process();
+  filter.SetFreq(freq);
+  filter.SetRes(res);
+  for (size_t i = 0; i < size; i++) {
+    for (size_t chn = GetChannelMin(); chn < GetChannelMax(); chn++) {
+      out[chn][i] = filter.Process(in[chn][i]);
+    }
+  }
+}
+
+void LadderFilterDroplet::Draw() {
+  DrawName("Ladder");
+}
+
+void LadderFilterDroplet::UpdateStateCallback() {}
+
+void LadderFilterDroplet::SetControls() {
+  if (GetState() == DropletState::kRight) {
+    freq_ctrl.Init(Patch()->controls[Patch()->CTRL_3],
+		   0.0, 10000.0f, Parameter::LINEAR);
+    res_ctrl.Init(Patch()->controls[Patch()->CTRL_4],
+		  0.0, 0.75f, Parameter::LINEAR);
+  } else {
+    freq_ctrl.Init(Patch()->controls[Patch()->CTRL_1],
+		   0.0, 10000.0f, Parameter::LINEAR);
+    res_ctrl.Init(Patch()->controls[Patch()->CTRL_2],
+		  0.0, 0.75f, Parameter::LINEAR);
+  }
+}

src/droplets/ladder_filter_droplet.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#ifndef DROPLETS_LADDER_FILTER_DROPLET_H_
+#define DROPLETS_LADDER_FILTER_DROPLET_H_
+
+#include "daisysp.h"
+#include "daisy_patch.h"
+
+#include "droplet.h"
+#include "../util.h"
+
+class LadderFilterDroplet: public Droplet {
+private:
+  MoogLadder filter;
+  Parameter freq_ctrl, res_ctrl;
+  float freq, res;
+public:
+  /*
+   * Constructor for a droplet.
+   *
+   * @param m_patch pointer to patch
+   * @param m_state droplet position
+   * @param sample_rate audio sample rate
+   */
+  LadderFilterDroplet(DaisyPatch* m_patch,
+		      DropletState m_state,
+		      float sample_rate);
+
+  /*
+   * Processes user controls and inputs.
+   */
+  void Control();
+
+  /*
+   * Processes audio input and outputs.
+   *
+   * @param in the audio inputs for the patch
+   * @param out the audio outputs for the patch
+   * @param size the number of inputs and outputs
+   */
+  void Process(AudioHandle::InputBuffer in,
+	       AudioHandle::OutputBuffer out,
+	       size_t size);
+
+  /*
+   * Processes information to be shown on the display. 
+   */
+  void Draw();
+  
+  /*
+   * Runs when droplet state is updated.
+   */
+  void UpdateStateCallback();
+
+  /*
+   * Set up the controls for the droplet.
+   */
+  void SetControls();
+};
+
+#endif // DROPLETS_LADDER_FILTER_DROPLET_H_

src/droplets/lfo_droplet.cpp

@@ -108,7 +108,6 @@ void LFODroplet::Draw() {
 void LFODroplet::UpdateStateCallback() {
   delete title_graph;
   CreateTitleGraph();
-  SetControls();
 }
 
 void LFODroplet::SetControls() {

src/droplets/noise_droplet.cpp

@@ -28,3 +28,5 @@ void NoiseDroplet::Draw() {
 }
 
 void NoiseDroplet::UpdateStateCallback() {}
+
+void NoiseDroplet::SetControls() {}

src/droplets/noise_droplet.h

@@ -46,6 +46,11 @@ public:
    * Runs when droplet state is updated.
    */
   void UpdateStateCallback();
+
+  /*
+   * Set up the controls for the droplet.
+   */
+  void SetControls();
 };
 
 #endif // DROPLETS_NOISE_DROPLET_H_

src/droplets/template_droplet.cpp

@@ -1,7 +1,8 @@
 #include "template_droplet.h"
 
 TemplateDroplet::TemplateDroplet(DaisyPatch* m_patch,
-			   DropletState m_state) :
+				 DropletState m_state,
+				 float sample_rate) :
   Droplet(m_patch,
 	  m_state) {
 }

src/droplets/template_droplet.h

@@ -17,8 +17,11 @@ public:
    *
    * @param m_patch pointer to patch
    * @param m_state droplet position
+   * @param sample_rate audio sample rate
    */
-  TemplateDroplet(DaisyPatch*, DropletState);
+  TemplateDroplet(DaisyPatch* m_patch,
+		  DropletState m_state,
+		  float sample_rate);
 
   /*
    * Processes user controls and inputs.
@@ -45,6 +48,11 @@ public:
    * Runs when droplet state is updated.
    */
   void UpdateStateCallback();
+
+  /*
+   * Set up the controls for the droplet.
+   */
+  void SetControls();
 };
 
 #endif // DROPLETS_TEMPLATE_DROPLET_H_

src/main.cpp

@@ -134,6 +134,10 @@ Droplet* GetDroplet(DropletState state,
     return new ADDroplet(&patch,
 			 state,
 			 sample_rate);
+  case MenuState::kLadderFilter:
+    return new LadderFilterDroplet(&patch,
+				   state,
+				   sample_rate);
   case MenuState::kLFO:
     return new LFODroplet(&patch,
 			  state,

src/main.h

@@ -13,6 +13,7 @@
 #include "droplets/droplet.h"
 #include "droplets/droplet_manager.h"
 #include "droplets/ad_droplet.h"
+#include "droplets/ladder_filter_droplet.h"
 #include "droplets/lfo_droplet.h"
 #include "droplets/mixer_droplet.h"
 #include "droplets/noise_droplet.h"

src/menu.cpp

@@ -10,6 +10,7 @@ Menu::Menu(DaisyPatch* m_patch,
   head = new MenuItem(MenuState::kSplit, "Split");
   head->AddItemEnd(new MenuItem(MenuState::kChange, ""));
   head->AddItemEnd(new MenuItem(MenuState::kAD, "AD"));
+  head->AddItemEnd(new MenuItem(MenuState::kLadderFilter, "Ladder Filter"));
   head->AddItemEnd(new MenuItem(MenuState::kLFO, "LFO"));
   head->AddItemEnd(new MenuItem(MenuState::kMixer, "Mixer"));
   head->AddItemEnd(new MenuItem(MenuState::kNoise, "Noise"));

src/menu_item.h

@@ -5,7 +5,8 @@
 
 #include <string>
 
-enum class MenuState {kSplit, kChange, kAD, kLFO, kMixer, kNoise, kVCA, kVCO};
+enum class MenuState {kSplit, kChange, kAD, kLadderFilter,
+  kLFO, kMixer, kNoise, kVCA, kVCO};
 
 class MenuItem {
  private: