refactor!: rename SynthService to Synther and related types

The -er suffix is more idiomatic for single method interfaces, and
the interface is not doing much more than converting the patch to a
synth. Names were updated throughout the project to reflect this
change. In particular, the "Service" in SynthService was not telling
anything helpful.

cmd/main_synther_native.go

@@ -4,4 +4,4 @@ package cmd
 
 import "github.com/vsariola/sointu/vm/compiler/bridge"
 
-var DefaultService = bridge.BridgeService{}
+var MainSynther = bridge.NativeSynther{}

cmd/main_synther_not_native.go

@@ -4,4 +4,4 @@ package cmd
 
 import "github.com/vsariola/sointu/vm"
 
-var DefaultService = vm.SynthService{}
+var MainSynther = vm.GoSynther{}

cmd/sointu-play/main.go

@@ -88,7 +88,7 @@ func main() {
 				return fmt.Errorf("the song could not be parsed as .json (%v) or .yml (%v)", errJSON, errYaml)
 			}
 		}
-		buffer, err := sointu.Play(bridge.BridgeService{}, song, !*unreleased) // render the song to calculate its length
+		buffer, err := sointu.Play(bridge.NativeSynther{}, song, !*unreleased) // render the song to calculate its length
 		if err != nil {
 			return fmt.Errorf("sointu.Play failed: %v", err)
 		}

cmd/sointu-track/main.go

@@ -57,8 +57,8 @@ func main() {
 		recoveryFile = filepath.Join(configDir, "Sointu", "sointu-track-recovery")
 	}
 	model := tracker.NewModel(modelMessages, playerMessages, recoveryFile)
-	player := tracker.NewPlayer(cmd.DefaultService, playerMessages, modelMessages)
-	tracker := gioui.NewTracker(model, cmd.DefaultService)
+	player := tracker.NewPlayer(cmd.MainSynther, playerMessages, modelMessages)
+	tracker := gioui.NewTracker(model, cmd.MainSynther)
 	output := audioContext.Output()
 	defer output.Close()
 	go func() {

cmd/sointu-vsti/main.go

@@ -62,8 +62,8 @@ func init() {
 			recoveryFile = filepath.Join(configDir, "Sointu", "sointu-vsti-recovery-"+hex.EncodeToString(randBytes))
 		}
 		model := tracker.NewModel(modelMessages, playerMessages, recoveryFile)
-		player := tracker.NewPlayer(cmd.DefaultService, playerMessages, modelMessages)
-		tracker := gioui.NewTracker(model, cmd.DefaultService)
+		player := tracker.NewPlayer(cmd.MainSynther, playerMessages, modelMessages)
+		tracker := gioui.NewTracker(model, cmd.MainSynther)
 		tracker.SetInstrEnlarged(true) // start the vsti with the instrument editor enlarged
 		go tracker.Main()
 		context := VSTIProcessContext{make([]vst2.MIDIEvent, 100), h}

synth.go

@@ -33,10 +33,10 @@ type (
 		Release(voice int)
 	}
 
-	// SynthService compiles a given Patch into a Synth, throwing errors if the
+	// Synther compiles a given Patch into a Synth, throwing errors if the
 	// Patch is malformed.
-	SynthService interface {
-		Compile(patch Patch, bpm int) (Synth, error)
+	Synther interface {
+		Synth(patch Patch, bpm int) (Synth, error)
 	}
 )
 
@@ -53,18 +53,18 @@ func Render(synth Synth, buffer AudioBuffer) error {
 	return nil
 }
 
-// Play plays the Song using a given SynthService, returning the stereo audio
+// Play plays the Song using a given Synther, returning the stereo audio
 // buffer and the sync buffer as a result (and possible errors). Passing
 // 'release' as true means that all the notes are released when the synth is
 // created. The default behaviour during runtime rendering is to leave them
 // playing, meaning that envelopes start attacking right away unless an explicit
 // note release is put to every track.
-func Play(synthService SynthService, song Song, release bool) (AudioBuffer, error) {
+func Play(synther Synther, song Song, release bool) (AudioBuffer, error) {
 	err := song.Validate()
 	if err != nil {
 		return nil, err
 	}
-	synth, err := synthService.Compile(song.Patch, song.BPM)
+	synth, err := synther.Synth(song.Patch, song.BPM)
 	if err != nil {
 		return nil, fmt.Errorf("sointu.Play failed: %v", err)
 	}

tracker/gioui/files.go

@@ -140,7 +140,7 @@ func (t *Tracker) saveSong(w io.WriteCloser) bool {
 }
 
 func (t *Tracker) exportWav(w io.WriteCloser, pcm16 bool) {
-	data, err := sointu.Play(t.synthService, t.Song(), true) // render the song to calculate its length
+	data, err := sointu.Play(t.synther, t.Song(), true) // render the song to calculate its length
 	if err != nil {
 		t.Alert.Update(fmt.Sprintf("Error rendering the song during export: %v", err), Error, time.Second*3)
 		return

tracker/gioui/tracker.go

@@ -64,7 +64,7 @@ type Tracker struct {
 	quitted                  bool
 	unmarshalRecoveryChannel chan []byte
 	marshalRecoveryChannel   chan (chan []byte)
-	synthService             sointu.SynthService
+	synther                  sointu.Synther
 
 	*trackerModel
 }
@@ -116,7 +116,7 @@ func (t *Tracker) UnmarshalContent(bytes []byte) error {
 	return errors.New("was able to unmarshal a song, but the bpm was 0")
 }
 
-func NewTracker(model *tracker.Model, synthService sointu.SynthService) *Tracker {
+func NewTracker(model *tracker.Model, synther sointu.Synther) *Tracker {
 	t := &Tracker{
 		Theme:             material.NewTheme(),
 		BPM:               new(NumberInput),
@@ -146,7 +146,7 @@ func NewTracker(model *tracker.Model, synthService sointu.SynthService) *Tracker
 		TrackEditor:       NewTrackEditor(),
 
 		errorChannel: make(chan error, 32),
-		synthService: synthService,
+		synther:      synther,
 		trackerModel: model,
 
 		marshalRecoveryChannel:   make(chan (chan []byte)),

tracker/player.go

@@ -29,7 +29,7 @@ type (
 		recordingFrames      int
 		recordingEvents      []PlayerProcessEvent
 
-		synthService   sointu.SynthService
+		synther        sointu.Synther
 		playerMessages chan<- PlayerMessage
 		modelMessages  <-chan interface{}
 	}
@@ -85,11 +85,11 @@ type (
 
 const NUM_RENDER_TRIES = 10000
 
-func NewPlayer(synthService sointu.SynthService, playerMessages chan<- PlayerMessage, modelMessages <-chan interface{}) *Player {
+func NewPlayer(synther sointu.Synther, playerMessages chan<- PlayerMessage, modelMessages <-chan interface{}) *Player {
 	p := &Player{
 		playerMessages: playerMessages,
 		modelMessages:  modelMessages,
-		synthService:   synthService,
+		synther:        synther,
 		volume:         Volume{Average: [2]float64{1e-9, 1e-9}, Peak: [2]float64{1e-9, 1e-9}},
 	}
 	return p
@@ -308,10 +308,10 @@ func (p *Player) compileOrUpdateSynth() {
 		}
 	} else {
 		var err error
-		p.synth, err = p.synthService.Compile(p.patch, p.bpm)
+		p.synth, err = p.synther.Synth(p.patch, p.bpm)
 		if err != nil {
 			p.synth = nil
-			p.trySend(PlayerCrashMessage{fmt.Errorf("synthService.Compile: %w", err)})
+			p.trySend(PlayerCrashMessage{fmt.Errorf("synther.Synth: %w", err)})
 			return
 		}
 		for i := 0; i < 32; i++ {

vm/compiler/bridge/native_synth.go

@@ -13,17 +13,17 @@ import (
 	"github.com/vsariola/sointu/vm"
 )
 
-type BridgeService struct {
+type NativeSynther struct {
 }
 
-type BridgeSynth C.Synth
+type NativeSynth C.Synth
 
-func (s BridgeService) Compile(patch sointu.Patch, bpm int) (sointu.Synth, error) {
+func (s NativeSynther) Synth(patch sointu.Patch, bpm int) (sointu.Synth, error) {
 	synth, err := Synth(patch, bpm)
 	return synth, err
 }
 
-func Synth(patch sointu.Patch, bpm int) (*BridgeSynth, error) {
+func Synth(patch sointu.Patch, bpm int) (*NativeSynth, error) {
 	s := new(C.Synth)
 	if n := patch.NumDelayLines(); n > 64 {
 		return nil, fmt.Errorf("native bridge has currently a hard limit of 64 delaylines; patch uses %v", n)
@@ -55,7 +55,7 @@ func Synth(patch sointu.Patch, bpm int) (*BridgeSynth, error) {
 	s.NumVoices = C.uint(comPatch.NumVoices)
 	s.Polyphony = C.uint(comPatch.PolyphonyBitmask)
 	s.RandSeed = 1
-	return (*BridgeSynth)(s), nil
+	return (*NativeSynth)(s), nil
 }
 
 // Render renders until the buffer is full or the modulated time is reached, whichever
@@ -79,7 +79,7 @@ func Synth(patch sointu.Patch, bpm int) (*BridgeSynth, error) {
 // time > maxtime, as it is modulated and the time could advance by 2 or more, so the loop
 // exit condition would fire when the time is already past maxtime.
 // Under no conditions, nsamples >= len(buffer)/2 i.e. guaranteed to never overwrite the buffer.
-func (bridgesynth *BridgeSynth) Render(buffer sointu.AudioBuffer, maxtime int) (int, int, error) {
+func (bridgesynth *NativeSynth) Render(buffer sointu.AudioBuffer, maxtime int) (int, int, error) {
 	synth := (*C.Synth)(bridgesynth)
 	// TODO: syncBuffer is not getting passed to cgo; do we want to even try to support the syncing with the native bridge
 	if len(buffer)%1 == 1 {
@@ -95,7 +95,7 @@ func (bridgesynth *BridgeSynth) Render(buffer sointu.AudioBuffer, maxtime int) (
 }
 
 // Trigger is part of C.Synths' implementation of sointu.Synth interface
-func (bridgesynth *BridgeSynth) Trigger(voice int, note byte) {
+func (bridgesynth *NativeSynth) Trigger(voice int, note byte) {
 	s := (*C.Synth)(bridgesynth)
 	if voice < 0 || voice >= len(s.SynthWrk.Voices) {
 		return
@@ -106,7 +106,7 @@ func (bridgesynth *BridgeSynth) Trigger(voice int, note byte) {
 }
 
 // Release is part of C.Synths' implementation of sointu.Synth interface
-func (bridgesynth *BridgeSynth) Release(voice int) {
+func (bridgesynth *NativeSynth) Release(voice int) {
 	s := (*C.Synth)(bridgesynth)
 	if voice < 0 || voice >= len(s.SynthWrk.Voices) {
 		return
@@ -115,7 +115,7 @@ func (bridgesynth *BridgeSynth) Release(voice int) {
 }
 
 // Update
-func (bridgesynth *BridgeSynth) Update(patch sointu.Patch, bpm int) error {
+func (bridgesynth *NativeSynth) Update(patch sointu.Patch, bpm int) error {
 	s := (*C.Synth)(bridgesynth)
 	if n := patch.NumDelayLines(); n > 64 {
 		return fmt.Errorf("native bridge has currently a hard limit of 64 delaylines; patch uses %v", n)

vm/compiler/bridge/native_synth_test.go

@@ -40,7 +40,7 @@ func TestOscillatSine(t *testing.T) {
 	}}}
 	tracks := []sointu.Track{{NumVoices: 1, Order: []int{0}, Patterns: []sointu.Pattern{{64, 0, 68, 0, 32, 0, 0, 0, 75, 0, 78, 0, 0, 0, 0, 0}}}}
 	song := sointu.Song{BPM: 100, RowsPerBeat: 4, Score: sointu.Score{RowsPerPattern: 16, Length: 1, Tracks: tracks}, Patch: patch}
-	buffer, err := sointu.Play(bridge.BridgeService{}, song, false)
+	buffer, err := sointu.Play(bridge.NativeSynther{}, song, false)
 	if err != nil {
 		t.Fatalf("Render failed: %v", err)
 	}
@@ -95,7 +95,7 @@ func TestAllRegressionTests(t *testing.T) {
 			if err != nil {
 				t.Fatalf("could not parse the .yml file: %v", err)
 			}
-			buffer, err := sointu.Play(bridge.BridgeService{}, song, false)
+			buffer, err := sointu.Play(bridge.NativeSynther{}, song, false)
 			buffer = buffer[:song.Score.LengthInRows()*song.SamplesPerRow()] // extend to the nominal length always.
 			if err != nil {
 				t.Fatalf("Play failed: %v", err)

vm/go_synth.go

@@ -13,22 +13,22 @@ import (
 
 //go:generate go run generate/generate.go
 
-// Interpreter is a pure-Go bytecode interpreter for the Sointu VM bytecode. It
+// GoSynth is a pure-Go bytecode interpreter for the Sointu VM bytecode. It
 // can only simulate bytecode compiled for AllFeatures, as the opcodes hard
 // coded in it for speed. If you are interested exactly how opcodes / units
-// work, studying Interpreter.Render is a good place to start.
+// work, studying GoSynth.Render is a good place to start.
 //
 // Internally, it uses software stack with practically no limitations in the
 // number of signals, so be warned that if you compose patches for it, they
 // might not work with the x87 implementation, as it has only 8-level stack.
-type Interpreter struct {
+type GoSynth struct {
 	bytePatch  BytePatch
 	stack      []float32
 	synth      synth
 	delaylines []delayline
 }
 
-type SynthService struct {
+type GoSynther struct {
 }
 
 const MAX_VOICES = 32
@@ -92,27 +92,27 @@ func Synth(patch sointu.Patch, bpm int) (sointu.Synth, error) {
 	if err != nil {
 		return nil, fmt.Errorf("error compiling %v", err)
 	}
-	ret := &Interpreter{bytePatch: *bytePatch, stack: make([]float32, 0, 4), delaylines: make([]delayline, patch.NumDelayLines())}
+	ret := &GoSynth{bytePatch: *bytePatch, stack: make([]float32, 0, 4), delaylines: make([]delayline, patch.NumDelayLines())}
 	ret.synth.randSeed = 1
 	return ret, nil
 }
 
-func (s SynthService) Compile(patch sointu.Patch, bpm int) (sointu.Synth, error) {
+func (s GoSynther) Synth(patch sointu.Patch, bpm int) (sointu.Synth, error) {
 	synth, err := Synth(patch, bpm)
 	return synth, err
 }
 
-func (s *Interpreter) Trigger(voiceIndex int, note byte) {
+func (s *GoSynth) Trigger(voiceIndex int, note byte) {
 	s.synth.voices[voiceIndex] = voice{}
 	s.synth.voices[voiceIndex].note = note
 	s.synth.voices[voiceIndex].sustain = true
 }
 
-func (s *Interpreter) Release(voiceIndex int) {
+func (s *GoSynth) Release(voiceIndex int) {
 	s.synth.voices[voiceIndex].sustain = false
 }
 
-func (s *Interpreter) Update(patch sointu.Patch, bpm int) error {
+func (s *GoSynth) Update(patch sointu.Patch, bpm int) error {
 	bytePatch, err := Encode(patch, AllFeatures{}, bpm)
 	if err != nil {
 		return fmt.Errorf("error compiling %v", err)
@@ -140,7 +140,7 @@ func (s *Interpreter) Update(patch sointu.Patch, bpm int) error {
 	return nil
 }
 
-func (s *Interpreter) Render(buffer sointu.AudioBuffer, maxtime int) (samples int, time int, renderError error) {
+func (s *GoSynth) Render(buffer sointu.AudioBuffer, maxtime int) (samples int, time int, renderError error) {
 	defer func() {
 		if err := recover(); err != nil {
 			renderError = fmt.Errorf("render panicced: %v", err)

vm/go_synth_test.go

@@ -43,7 +43,7 @@ func TestAllRegressionTests(t *testing.T) {
 			if err != nil {
 				t.Fatalf("could not parse the .yml file: %v", err)
 			}
-			buffer, err := sointu.Play(vm.SynthService{}, song, false)
+			buffer, err := sointu.Play(vm.GoSynther{}, song, false)
 			buffer = buffer[:song.Score.LengthInRows()*song.SamplesPerRow()] // extend to the nominal length always.
 			if err != nil {
 				t.Fatalf("Play failed: %v", err)