feat: added mixer component and add wet/dry mix to distortion

core/Mixer.cpp

@@ -0,0 +1,59 @@
+#include "Mixer.hpp"
+#include <cstdint>
+
+template <uint32_t NumInputs>
+Mixer<NumInputs>::Mixer(float init_gain) : normalise_(false) {
+  for (uint32_t i = 0; i < NumInputs; ++i) {
+    gains_[i] = init_gain;
+  }
+}
+
+template <uint32_t NumInputs>
+void Mixer<NumInputs>::process(const float **inputs, float *out,
+                               uint32_t frames) {
+  mixChannels(inputs, out, frames);
+}
+
+template <uint32_t NumInputs>
+void Mixer<NumInputs>::processStereo(const float **inputsL,
+                                     const float **inputsR, float *outL,
+                                     float *outR, uint32_t frames) {
+  mixChannels(inputsL, outL, frames);
+  mixChannels(inputsR, outR, frames);
+}
+
+template <uint32_t NumInputs>
+void Mixer<NumInputs>::mixChannels(const float **inputs, float *out,
+                                   uint32_t frames) {
+  float scale = normalise_ ? (1.0f / NumInputs) : 1.0f;
+  for (uint32_t i = 0; i < frames; ++i) {
+    float sum = 0.0f;
+    for (uint32_t j = 0; j < NumInputs; ++j) {
+      sum += inputs[j][i] * (gains_[j] * scale);
+    }
+    out[i] = sum;
+  }
+}
+
+template <uint32_t NumInputs>
+void Mixer<NumInputs>::setInputGain(uint32_t index, float gain) {
+  gains_[index] = gain;
+}
+
+template <uint32_t NumInputs>
+float Mixer<NumInputs>::getInputGain(uint32_t index) const {
+  return isValidInputIndex(index) ? gains_[index] : 0;
+}
+
+template <uint32_t NumInputs> void Mixer<NumInputs>::setNormalise(bool norm) {
+  normalise_ = norm;
+}
+
+template <uint32_t NumInputs> bool Mixer<NumInputs>::getNormalise() const {
+  return normalise_;
+}
+
+template <uint32_t NumInputs>
+bool Mixer<NumInputs>::isValidInputIndex(float index) const {
+  return index >= 0 && index < NumInputs;
+}

core/Mixer.hpp

@@ -0,0 +1,29 @@
+#ifndef MIXER_HPP_INCLUDED
+#define MIXER_HPP_INCLUDED
+
+#include <cstdint>
+
+template <uint32_t NumInputs> class Mixer {
+public:
+  Mixer(float init_gain);
+
+  void process(const float **inputs, float *out, uint32_t frames);
+  void processStereo(const float **inputsL, const float **inputsR, float *outL,
+                     float *outR, uint32_t frames);
+
+  void setInputGain(uint32_t index, float gain);
+  float getInputGain(uint32_t index) const;
+
+  void setNormalise(bool norm);
+  bool getNormalise() const;
+
+private:
+  void mixChannels(const float **inputs, float *out, uint32_t frames);
+  bool isValidInputIndex(float index) const;
+  float gains_[NumInputs];
+  bool normalise_;
+};
+
+#endif // MIXER_HPP_INCLUDED
+
+template class Mixer<2u>;

plugins/SquidgeDistortion/Makefile

@@ -1,7 +1,7 @@
 #!/usr/bin/make -f
 NAME = SquidgeDistortion
 
-FILES_DSP = SquidgeDistortion.cpp ../../core/Gain.cpp ../../core/Clipper.cpp
+FILES_DSP = SquidgeDistortion.cpp ../../core/Gain.cpp ../../core/Clipper.cpp ../../core/Mixer.cpp
 
 TARGETS = vst3 clap
 

plugins/SquidgeDistortion/SquidgeDistortion.cpp

@@ -1,20 +1,28 @@
+#include "DistrhoDetails.hpp"
 #include "DistrhoPlugin.hpp"
 #include "DistrhoPluginInfo.h"
 
 #include "../../core/Clipper.hpp"
 #include "../../core/Gain.hpp"
+#include "../../core/Mixer.hpp"
 
 START_NAMESPACE_DISTRHO
 
 class SquidgeDistortion : public Plugin {
 
 public:
+  enum MixerChannels { kChannelDry, kChannelWet, KChannelCount };
   enum Parameters {
     kParamGain,
     kParamClipMode,
+    kParamMixVolume,
     kParameterCount // must be last
   };
-  SquidgeDistortion() : Plugin(kParameterCount, 0, 0), gain_(2.0f) {}
+  SquidgeDistortion()
+      : Plugin(kParameterCount, 0, 0), gain_(2.0f), mixer_(1.0f) {
+    mixer_.setInputGain(kChannelDry, 0.0f);
+    mixer_.setInputGain(kChannelWet, 1.0f);
+  }
 
 protected:
   const char *getLabel() const override { return "SquidgeDistortion"; }
@@ -52,6 +60,14 @@ protected:
       parameter.enumValues.values =
           const_cast<ParameterEnumerationValue *>(sClipModes);
       break;
+    case kParamMixVolume:
+      parameter.name = "Dry/Wet";
+      parameter.symbol = "drywetvolume";
+      parameter.ranges.min = 0.0f;
+      parameter.ranges.def = 1.0f;
+      parameter.ranges.max = 1.0f;
+      parameter.hints = kParameterIsAutomatable;
+      break;
     }
   }
 
@@ -61,6 +77,8 @@ protected:
       return gain_.getGain();
     case kParamClipMode:
       return (float)clipper_.getMode();
+    case kParamMixVolume:
+      return mixer_.getInputGain(kChannelWet);
     }
     return 0.0f;
   }
@@ -73,18 +91,30 @@ protected:
     case kParamClipMode:
       clipper_.setMode((Clipper::ClipperMode)value);
       break;
+    case kParamMixVolume:
+      mixer_.setInputGain(kChannelWet, value);
+      mixer_.setInputGain(kChannelDry, 1.0f - value);
+      break;
     }
   }
 
   void run(const float **inputs, float **outputs, uint32_t frames) override {
-    gain_.processStereo(inputs[0], inputs[1], outputs[0], outputs[1], frames);
-    clipper_.processStereo(outputs[0], outputs[1], outputs[0], outputs[1],
+    gain_.processStereo(inputs[0], inputs[1], wetBufferL_, wetBufferR_, frames);
+    clipper_.processStereo(wetBufferL_, wetBufferR_, wetBufferL_, wetBufferR_,
                            frames);
+
+    const float *inputsL[2] = {inputs[0], wetBufferL_};
+    const float *inputsR[2] = {inputs[1], wetBufferR_};
+
+    mixer_.processStereo(inputsL, inputsR, outputs[0], outputs[1], frames);
   }
 
 private:
   Gain gain_;
   Clipper clipper_;
+  Mixer<2> mixer_;
+  float wetBufferL_[4096];
+  float wetBufferR_[4096];
 
   DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SquidgeDistortion);
 };