Add stereo effect

Source/audio/StereoEffect.cpp

@@ -0,0 +1,35 @@
+#include "StereoEffect.h"
+
+StereoEffect::StereoEffect() {}
+
+StereoEffect::~StereoEffect() {}
+
+OsciPoint StereoEffect::apply(int index, OsciPoint input, const std::vector<std::atomic<double>>& values, double sampleRate) {
+    if (this->sampleRate != sampleRate) {
+        this->sampleRate = sampleRate;
+        initialiseBuffer(sampleRate);
+    }
+    double sampleOffset = values[0].load() / 10;
+    sampleOffset = juce::jlimit(0.0, 1.0, sampleOffset);
+    sampleOffset *= buffer.size();
+
+    head++;
+    if (head >= buffer.size()) {
+        head = 0;
+    }
+    
+    buffer[head] = input;
+
+    int readHead = head - sampleOffset;
+    if (readHead < 0) {
+        readHead += buffer.size();
+    }
+    
+    return OsciPoint(input.x, buffer[readHead].y, input.z);
+}
+
+void StereoEffect::initialiseBuffer(double sampleRate) {
+    buffer.clear();
+    buffer.resize(bufferLength * sampleRate);
+    head = 0;
+}

Source/audio/StereoEffect.h

@@ -0,0 +1,19 @@
+#pragma once
+#include "EffectApplication.h"
+#include "../shape/OsciPoint.h"
+
+class StereoEffect : public EffectApplication {
+public:
+	StereoEffect();
+	~StereoEffect();
+
+	OsciPoint apply(int index, OsciPoint input, const std::vector<std::atomic<double>>& values, double sampleRate) override;
+
+private:
+	void initialiseBuffer(double sampleRate);
+
+	const double bufferLength = 0.1;
+	double sampleRate = -1;
+	std::vector<OsciPoint> buffer;
+	int head = 0;
+};

Source/visualiser/VisualiserSettings.cpp

@@ -21,6 +21,7 @@ VisualiserSettings::VisualiserSettings(VisualiserParameters& p, int numChannels)
     addAndMakeVisible(screenOverlay);
 #if SOSCI_FEATURES
     addAndMakeVisible(screenSaturation);
+    addAndMakeVisible(stereo);
     addAndMakeVisible(xOffset);
     addAndMakeVisible(yOffset);
     addAndMakeVisible(xScale);
@@ -62,6 +63,7 @@ VisualiserSettings::VisualiserSettings(VisualiserParameters& p, int numChannels)
 
 #if SOSCI_FEATURES
     screenSaturation.setSliderOnValueChange();
+    stereo.setSliderOnValueChange();
     xOffset.setSliderOnValueChange();
     yOffset.setSliderOnValueChange();
     xScale.setSliderOnValueChange();
@@ -102,6 +104,7 @@ void VisualiserSettings::resized() {
     smooth.setBounds(area.removeFromTop(rowHeight));
     
 #if SOSCI_FEATURES
+    stereo.setBounds(area.removeFromTop(rowHeight));
     xScale.setBounds(area.removeFromTop(rowHeight));
     yScale.setBounds(area.removeFromTop(rowHeight));
     xOffset.setBounds(area.removeFromTop(rowHeight));

Source/visualiser/VisualiserSettings.h

@@ -8,6 +8,7 @@
 #include "../LookAndFeel.h"
 #include "../components/SwitchButton.h"
 #include "../audio/SmoothEffect.h"
+#include "../audio/StereoEffect.h"
 
 enum class ScreenOverlay : int {
     Empty = 1,
@@ -105,6 +106,16 @@ public:
             VERSION_HINT, 1.0, 0.0, 5.0
         )
     );
+    std::shared_ptr<StereoEffect> stereoEffectApplication = std::make_shared<StereoEffect>();
+    std::shared_ptr<Effect> stereoEffect = std::make_shared<Effect>(
+        stereoEffectApplication,
+        new EffectParameter(
+            "Stereo",
+            "Turns mono audio that is uninteresting to visualise into stereo audio that is interesting to visualise.",
+            "stereo",
+            VERSION_HINT, 0.0, 0.0, 1.0
+        )
+    );
     std::shared_ptr<Effect> scaleEffect = std::make_shared<Effect>(
         [this](int index, OsciPoint input, const std::vector<std::atomic<double>>& values, double sampleRate) {
             input.scale(values[0].load(), values[1].load(), 1.0);
@@ -249,6 +260,7 @@ public:
         smoothEffect,
 #if SOSCI_FEATURES
         screenSaturationEffect,
+        stereoEffect,
         scaleEffect,
         offsetEffect,
 #endif
@@ -367,6 +379,7 @@ private:
 
 #if SOSCI_FEATURES
     EffectComponent screenSaturation{*parameters.screenSaturationEffect};
+    EffectComponent stereo{*parameters.stereoEffect};
     EffectComponent xScale{*parameters.scaleEffect, 0};
     EffectComponent yScale{*parameters.scaleEffect, 1};
     EffectComponent xOffset{*parameters.offsetEffect, 0};

sosci.jucer

@@ -108,6 +108,9 @@
         <FILE id="vj5mRC" name="SmoothEffect.cpp" compile="1" resource="0"
               file="Source/audio/SmoothEffect.cpp"/>
         <FILE id="GSnwBW" name="SmoothEffect.h" compile="0" resource="0" file="Source/audio/SmoothEffect.h"/>
+        <FILE id="Iq5LKp" name="StereoEffect.cpp" compile="1" resource="0"
+              file="Source/audio/StereoEffect.cpp"/>
+        <FILE id="jq3EXV" name="StereoEffect.h" compile="0" resource="0" file="Source/audio/StereoEffect.h"/>
       </GROUP>
       <GROUP id="{CD81913A-7F0E-5898-DA77-5EBEB369DEB1}" name="components">
         <FILE id="URb7Ok" name="AboutComponent.cpp" compile="1" resource="0"