cleanup envelope parameter mappings

src/synth/AudioEngine.cpp

@@ -11,6 +11,8 @@ AudioEngine::AudioEngine() : synth_(params_) {
     // TODO: get audio configurations
     synth_.setSampleRate(sampleRate_);
 
+    synth_.setScopeBuffer(&scope_);
+
 }
 
 AudioEngine::~AudioEngine() {

src/synth/AudioEngine.h

@@ -23,6 +23,7 @@ public:
     // getters
     ParameterStore* parameters() { return &params_; }
     NoteQueue& noteQueue() { return noteQueue_; }
+    ScopeBuffer& scopeBuffer() { return scope_; }
 
 private:
 
@@ -35,6 +36,7 @@ private:
     ParameterStore params_; // stores the control parameters
     NoteQueue noteQueue_; // stores note events for passing between threads
     Synth synth_; // generates audio
+    ScopeBuffer scope_ { 1024 }; // stores audio samples for visualization
 
     RtAudio audio_; // audio device
     // TODO: id like a yml config file or something for these

src/synth/Envelope.h

@@ -32,7 +32,7 @@ public:
     void noteOn();
     void noteOff();
 
-    // return current level
+    // calculates and returns envelope level. must only be called once per sample
     float process(); 
 
     // determine if a note is playing or not

src/synth/Synth.cpp

@@ -99,6 +99,12 @@ void Synth::process(float* out, uint32_t nFrames, uint32_t sampleRate) {
         out[2*i] = sampleOut; // left
         out[2*i+1] = sampleOut; // right
 
+        // write to scope buffer
+        if (scope_) {
+            scope_->push(sampleOut); // visualization tap
+            // set trigger info here too
+        }
+
         // sampling business
         phase_ += phaseInc;
         if (phase_ > 2.0f * M_PI) phase_ -= 2.0f * M_PI;

src/synth/Synth.h

@@ -4,6 +4,7 @@
 #include "../ParameterStore.h"
 #include "../NoteQueue.h"
 #include "Envelope.h"
+#include "ScopeBuffer.h"
 
 #include <vector>
 #include <atomic>
@@ -28,8 +29,9 @@ public:
     // handles note events
     void handleNoteEvent(const NoteEvent& event);
 
-    // sample rate setter
+    // setters
     void setSampleRate(uint32_t sampleRate) { sampleRate_ = sampleRate; }
+    void setScopeBuffer(ScopeBuffer* scope) { scope_ = scope; }
 
 private:
 
@@ -60,7 +62,9 @@ private:
     std::vector<uint8_t> heldNotes_;
 
     // envelopes !!
-    // TODO: set these parameters via sliders
     Envelope gainEnvelope_;
 
+    // for the scope
+    ScopeBuffer* scope_ = nullptr;
+
 };