feat(tracker): ability to bind MIDI controllers to parameters

Closes #152

tracker/broker.go

@@ -2,7 +2,6 @@ package tracker
 
 import (
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/vsariola/sointu"
@@ -33,24 +32,22 @@ type (
 	//      case <-time.After(3 * time.Second):
 	//    }
 	Broker struct {
-		ToModel    chan MsgToModel
-		ToPlayer   chan any // TODO: consider using a sum type here, for a bit more type safety. See: https://www.jerf.org/iri/post/2917/
-		ToDetector chan MsgToDetector
-		ToGUI      chan any
-		ToSpecAn   chan MsgToSpecAn
+		ToModel      chan MsgToModel
+		ToPlayer     chan any // TODO: consider using a sum type here, for a bit more type safety. See: https://www.jerf.org/iri/post/2917/
+		ToDetector   chan MsgToDetector
+		ToGUI        chan any
+		ToSpecAn     chan MsgToSpecAn
+		ToMIDIRouter chan any
 
-		CloseDetector chan struct{}
-		CloseGUI      chan struct{}
-		CloseSpecAn   chan struct{}
+		CloseDetector   chan struct{}
+		CloseGUI        chan struct{}
+		CloseSpecAn     chan struct{}
+		CloseMIDIRouter chan struct{}
 
-		FinishedGUI      chan struct{}
-		FinishedDetector chan struct{}
-		FinishedSpecAn   chan struct{}
-
-		// mIDIEventsToGUI is true if all MIDI events should be sent to the GUI,
-		// for inputting notes to tracks. If false, they should be sent to the
-		// player instead.
-		mIDIEventsToGUI atomic.Bool
+		FinishedGUI        chan struct{}
+		FinishedDetector   chan struct{}
+		FinishedSpecAn     chan struct{}
+		FinishedMIDIRouter chan struct{}
 
 		bufferPool   sync.Pool
 		spectrumPool sync.Pool
@@ -114,29 +111,25 @@ const (
 
 func NewBroker() *Broker {
 	return &Broker{
-		ToPlayer:         make(chan any, 1024),
-		ToModel:          make(chan MsgToModel, 1024),
-		ToDetector:       make(chan MsgToDetector, 1024),
-		ToGUI:            make(chan any, 1024),
-		ToSpecAn:         make(chan MsgToSpecAn, 1024),
-		CloseDetector:    make(chan struct{}, 1),
-		CloseGUI:         make(chan struct{}, 1),
-		CloseSpecAn:      make(chan struct{}, 1),
-		FinishedGUI:      make(chan struct{}),
-		FinishedDetector: make(chan struct{}),
-		FinishedSpecAn:   make(chan struct{}),
-		bufferPool:       sync.Pool{New: func() any { return &sointu.AudioBuffer{} }},
-		spectrumPool:     sync.Pool{New: func() any { return &Spectrum{} }},
+		ToPlayer:           make(chan any, 1024),
+		ToModel:            make(chan MsgToModel, 1024),
+		ToDetector:         make(chan MsgToDetector, 1024),
+		ToGUI:              make(chan any, 1024),
+		ToMIDIRouter:       make(chan any, 1024),
+		ToSpecAn:           make(chan MsgToSpecAn, 1024),
+		CloseDetector:      make(chan struct{}, 1),
+		CloseGUI:           make(chan struct{}, 1),
+		CloseSpecAn:        make(chan struct{}, 1),
+		CloseMIDIRouter:    make(chan struct{}, 1),
+		FinishedGUI:        make(chan struct{}),
+		FinishedDetector:   make(chan struct{}),
+		FinishedSpecAn:     make(chan struct{}),
+		FinishedMIDIRouter: make(chan struct{}),
+		bufferPool:         sync.Pool{New: func() any { return &sointu.AudioBuffer{} }},
+		spectrumPool:       sync.Pool{New: func() any { return &Spectrum{} }},
 	}
 }
 
-func (b *Broker) MIDIChannel() chan<- any {
-	if b.mIDIEventsToGUI.Load() {
-		return b.ToGUI
-	}
-	return b.ToPlayer
-}
-
 // GetAudioBuffer returns an audio buffer from the buffer pool. The buffer is
 // guaranteed to be empty. After using the buffer, it should be returned to the
 // pool with PutAudioBuffer.