feat(tracker): add new instrument & new track buttons

sointu.go

@@ -241,6 +241,14 @@ func (s *Song) FirstTrackVoice(track int) int {
 	return ret
 }
 
+func (s *Song) TotalTrackVoices() int {
+	ret := 0
+	for _, t := range s.Tracks {
+		ret += t.NumVoices
+	}
+	return ret
+}
+
 // TBD: Where shall we put methods that work on pure domain types and have no dependencies
 // e.g. Validate here
 func (s *Song) Validate() error {

tracker/defaultsong.go

@@ -2,6 +2,16 @@ package tracker
 
 import "github.com/vsariola/sointu"
 
+var defaultInstrument = sointu.Instrument{
+	NumVoices: 1,
+	Units: []sointu.Unit{
+		{Type: "envelope", Parameters: map[string]int{"stereo": 1, "attack": 32, "decay": 32, "sustain": 64, "release": 64, "gain": 64}},
+		{Type: "oscillator", Parameters: map[string]int{"stereo": 1, "transpose": 64, "detune": 64, "phase": 0, "color": 128, "shape": 64, "gain": 64, "type": sointu.Sine}},
+		{Type: "mulp", Parameters: map[string]int{"stereo": 1}},
+		{Type: "out", Parameters: map[string]int{"stereo": 1, "gain": 64}},
+	},
+}
+
 var defaultSong = sointu.Song{
 	BPM: 100,
 	Tracks: []sointu.Track{

tracker/layout.go

@@ -18,6 +18,7 @@ import (
 
 var upIcon *widget.Icon
 var downIcon *widget.Icon
+var addIcon *widget.Icon
 
 func init() {
 	var err error
@@ -29,6 +30,10 @@ func init() {
 	if err != nil {
 		log.Fatal(err)
 	}
+	addIcon, err = widget.NewIcon(icons.ContentAdd)
+	if err != nil {
+		log.Fatal(err)
+	}
 }
 
 func (t *Tracker) Layout(gtx layout.Context) {
@@ -42,7 +47,7 @@ func (t *Tracker) Layout(gtx layout.Context) {
 }
 
 func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
-	flexTracks := make([]layout.FlexChild, len(t.song.Tracks)+1)
+	flexTracks := make([]layout.FlexChild, len(t.song.Tracks))
 	t.playRowPatMutex.RLock()
 	defer t.playRowPatMutex.RUnlock()
 
@@ -51,7 +56,7 @@ func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
 		playPat = -1
 	}
 
-	flexTracks[0] = layout.Rigid(Lowered(t.layoutRowMarkers(
+	rowMarkers := layout.Rigid(Lowered(t.layoutRowMarkers(
 		len(t.song.Tracks[0].Patterns[0]),
 		len(t.song.Tracks[0].Sequence),
 		t.CursorRow,
@@ -61,7 +66,7 @@ func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
 		playPat,
 	)))
 	for i, trk := range t.song.Tracks {
-		flexTracks[i+1] = layout.Rigid(Lowered(t.layoutTrack(
+		flexTracks[i] = layout.Rigid(Lowered(t.layoutTrack(
 			trk.Patterns,
 			trk.Sequence,
 			t.ActiveTrack == i,
@@ -72,8 +77,31 @@ func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
 			playPat,
 		)))
 	}
+	in := layout.UniformInset(unit.Dp(8))
+	buttons := layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+		iconBtn := material.IconButton(t.Theme, t.NewTrackBtn, addIcon)
+		if t.song.TotalTrackVoices() >= t.song.Patch.TotalVoices() {
+			iconBtn.Color = inactiveBtnColor
+		}
+		return in.Layout(gtx, iconBtn.Layout)
+	})
+	go func() {
+		for t.NewTrackBtn.Clicked() {
+			t.AddTrack()
+		}
+	}()
 	return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
-		flexTracks...,
+		rowMarkers,
+		layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
+			defer op.Push(gtx.Ops).Pop()
+			clip.Rect{Max: gtx.Constraints.Max}.Add(gtx.Ops)
+			dims := layout.Flex{Axis: layout.Horizontal}.Layout(gtx, flexTracks...)
+			if dims.Size.X > gtx.Constraints.Max.X {
+				dims.Size.X = gtx.Constraints.Max.X
+			}
+			return dims
+		}),
+		buttons,
 	)
 }
 
@@ -87,6 +115,7 @@ func (t *Tracker) layoutControls(gtx layout.Context) layout.Dimensions {
 	}
 	in := layout.UniformInset(unit.Dp(8))
 
+	go func() {
 		for t.OctaveUpBtn.Clicked() {
 			t.ChangeOctave(1)
 		}
@@ -99,6 +128,10 @@ func (t *Tracker) layoutControls(gtx layout.Context) layout.Dimensions {
 		for t.BPMDownBtn.Clicked() {
 			t.ChangeBPM(-1)
 		}
+		for t.NewInstrumentBtn.Clicked() {
+			t.AddInstrument()
+		}
+	}()
 
 	return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
 		layout.Rigid(Raised(t.layoutPatterns(
@@ -128,6 +161,10 @@ func (t *Tracker) layoutControls(gtx layout.Context) layout.Dimensions {
 		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
 			return in.Layout(gtx, material.IconButton(t.Theme, t.BPMDownBtn, downIcon).Layout)
 		}),
+		layout.Rigid(t.darkLine(false)),
+		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
+			return in.Layout(gtx, material.IconButton(t.Theme, t.NewInstrumentBtn, addIcon).Layout)
+		}),
 	)
 }
 

tracker/patterns.go

@@ -13,7 +13,7 @@ import (
 	"github.com/vsariola/sointu"
 )
 
-const patternCellHeight = 12
+const patternCellHeight = 16
 const patternCellWidth = 16
 
 func (t *Tracker) layoutPatterns(tracks []sointu.Track, activeTrack, cursorPattern, cursorCol, playingPattern int) layout.Widget {

tracker/sequencer.go

@@ -57,7 +57,9 @@ func (s *Sequencer) ReadAudio(buffer []float32) (int, error) {
 		gotRow := true
 		if s.rowTime >= s.rowLength {
 			var row []Note
+			s.mutex.Unlock()
 			row, gotRow = s.iterator()
+			s.mutex.Lock()
 			if gotRow {
 				for _, n := range row {
 					s.doNote(n.Voice, n.Note)

tracker/theme.go

@@ -11,7 +11,7 @@ import (
 var fontCollection []text.FontFace = gofont.Collection()
 var textShaper = text.NewCache(fontCollection)
 
-var neutral = color.RGBA{R: 64, G: 64, B: 64, A: 255}
+var neutral = color.RGBA{R: 38, G: 38, B: 38, A: 255}
 var light = color.RGBA{R: 128, G: 128, B: 128, A: 255}
 var dark = color.RGBA{R: 15, G: 15, B: 15, A: 255}
 var white = color.RGBA{R: 255, G: 255, B: 255, A: 255}
@@ -48,3 +48,5 @@ var patternTextColor = white
 var patternActiveTextColor = yellow
 var patternFont = fontCollection[6].Font
 var patternFontSize = unit.Px(12)
+
+var inactiveBtnColor = color.RGBA{R: 61, G: 55, B: 55, A: 255}

tracker/tracker.go

@@ -32,6 +32,8 @@ type Tracker struct {
 	OctaveDownBtn    *widget.Clickable
 	BPMUpBtn         *widget.Clickable
 	BPMDownBtn       *widget.Clickable
+	NewTrackBtn      *widget.Clickable
+	NewInstrumentBtn *widget.Clickable
 
 	sequencer    *Sequencer
 	ticked       chan struct{}
@@ -85,11 +87,11 @@ func (t *Tracker) sequencerLoop(closer <-chan struct{}) {
 	}
 	curVoices := make([]int, 32)
 	t.sequencer = NewSequencer(synth, 44100*60/(4*t.song.BPM), func() ([]Note, bool) {
+		t.playRowPatMutex.Lock()
 		if !t.Playing {
+			t.playRowPatMutex.Unlock()
 			return nil, false
 		}
-		t.playRowPatMutex.Lock()
-		defer t.playRowPatMutex.Unlock()
 		t.PlayRow++
 		if t.PlayRow >= t.song.PatternRows() {
 			t.PlayRow = 0
@@ -109,16 +111,17 @@ func (t *Tracker) sequencerLoop(closer <-chan struct{}) {
 			if note == 1 { // anything but hold causes an action.
 				continue
 			}
-			notes = append(notes, Note{curVoices[track], 0})
+			first := t.song.FirstTrackVoice(track)
+			notes = append(notes, Note{first + curVoices[track], 0})
 			if note > 1 {
 				curVoices[track]++
-				first := t.song.FirstTrackVoice(track)
+				if curVoices[track] >= t.song.Tracks[track].NumVoices {
-				if curVoices[track] >= first+t.song.Tracks[track].NumVoices {
+					curVoices[track] = 0
-					curVoices[track] = first
 				}
-				notes = append(notes, Note{curVoices[track], note})
+				notes = append(notes, Note{first + curVoices[track], note})
 			}
 		}
+		t.playRowPatMutex.Unlock()
 		t.ticked <- struct{}{}
 		return notes, true
 	})
@@ -165,6 +168,41 @@ func (t *Tracker) ChangeBPM(delta int) bool {
 	return false
 }
 
+func (t *Tracker) AddTrack() {
+	if t.song.TotalTrackVoices() < t.song.Patch.TotalVoices() {
+		seq := make([]byte, t.song.SequenceLength())
+		patterns := [][]byte{make([]byte, t.song.PatternRows())}
+		t.song.Tracks = append(t.song.Tracks, sointu.Track{
+			NumVoices: 1,
+			Patterns:  patterns,
+			Sequence:  seq,
+		})
+	}
+}
+
+func (t *Tracker) AddInstrument() {
+	if t.song.Patch.TotalVoices() < 32 {
+		units := make([]sointu.Unit, len(defaultInstrument.Units))
+		for i, defUnit := range defaultInstrument.Units {
+			units[i].Type = defUnit.Type
+			units[i].Parameters = make(map[string]int)
+			for k, v := range defUnit.Parameters {
+				units[i].Parameters[k] = v
+			}
+		}
+		t.song.Patch.Instruments = append(t.song.Patch.Instruments, sointu.Instrument{
+			NumVoices: defaultInstrument.NumVoices,
+			Units:     units,
+		})
+	}
+	synth, err := bridge.Synth(t.song.Patch)
+	if err == nil {
+		t.sequencer.SetSynth(synth)
+	} else {
+		fmt.Printf("%v", err)
+	}
+}
+
 func New(audioContext sointu.AudioContext) *Tracker {
 	t := &Tracker{
 		Theme:            material.NewTheme(gofont.Collection()),
@@ -175,6 +213,8 @@ func New(audioContext sointu.AudioContext) *Tracker {
 		OctaveDownBtn:    new(widget.Clickable),
 		BPMUpBtn:         new(widget.Clickable),
 		BPMDownBtn:       new(widget.Clickable),
+		NewTrackBtn:      new(widget.Clickable),
+		NewInstrumentBtn: new(widget.Clickable),
 		setPlaying:       make(chan bool),
 		rowJump:          make(chan int),
 		patternJump:      make(chan int),