332 lines
8.4 KiB
Go
332 lines
8.4 KiB
Go
package main
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import "math"
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import "time"
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import "errors"
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import "github.com/faiface/beep"
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import "github.com/faiface/beep/speaker"
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import "git.tebibyte.media/sashakoshka/tomo"
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import "git.tebibyte.media/sashakoshka/tomo/layouts"
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import "git.tebibyte.media/sashakoshka/tomo/elements"
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import "git.tebibyte.media/sashakoshka/tomo/elements/fun"
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import "git.tebibyte.media/sashakoshka/tomo/elements/fun/music"
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import "git.tebibyte.media/sashakoshka/tomo/elements/containers"
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import _ "git.tebibyte.media/sashakoshka/tomo/backends/all"
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const sampleRate = 44100
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const bufferSize = 256
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var tuning = music.EqualTemparment { A4: 440 }
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var waveform = 0
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var playing = map[music.Note] *toneStreamer { }
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var adsr = ADSR {
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Attack: 5 * time.Millisecond,
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Decay: 400 * time.Millisecond,
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Sustain: 0.7,
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Release: 500 * time.Millisecond,
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}
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var gain = 0.3
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func main () {
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speaker.Init(sampleRate, bufferSize)
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tomo.Run(run)
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}
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func run () {
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window, _ := tomo.NewWindow(2, 2)
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window.SetTitle("Piano")
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container := containers.NewContainer(layouts.Vertical { true, true })
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controlBar := containers.NewContainer(layouts.Horizontal { true, false })
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waveformColumn := containers.NewContainer(layouts.Vertical { true, false })
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waveformList := elements.NewList (
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elements.NewListEntry("Sine", func(){ waveform = 0 }),
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elements.NewListEntry("Triangle", func(){ waveform = 3 }),
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elements.NewListEntry("Square", func(){ waveform = 1 }),
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elements.NewListEntry("Saw", func(){ waveform = 2 }),
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elements.NewListEntry("Supersaw", func(){ waveform = 4 }),
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)
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waveformList.OnNoEntrySelected (func(){waveformList.Select(0)})
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waveformList.Select(0)
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adsrColumn := containers.NewContainer(layouts.Vertical { true, false })
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adsrGroup := containers.NewContainer(layouts.Horizontal { true, false })
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attackSlider := elements.NewLerpSlider(0, 3 * time.Second, adsr.Attack, true)
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decaySlider := elements.NewLerpSlider(0, 3 * time.Second, adsr.Decay, true)
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sustainSlider := elements.NewSlider(adsr.Sustain, true)
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releaseSlider := elements.NewLerpSlider(0, 3 * time.Second, adsr.Release, true)
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gainSlider := elements.NewSlider(math.Sqrt(gain), false)
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attackSlider.OnRelease (func () {
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adsr.Attack = attackSlider.Value()
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})
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decaySlider.OnRelease (func () {
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adsr.Decay = decaySlider.Value()
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})
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sustainSlider.OnRelease (func () {
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adsr.Sustain = sustainSlider.Value()
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})
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releaseSlider.OnRelease (func () {
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adsr.Release = releaseSlider.Value()
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})
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gainSlider.OnRelease (func () {
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gain = math.Pow(gainSlider.Value(), 2)
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})
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patchColumn := containers.NewContainer(layouts.Vertical { true, false })
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patch := func (w int, a, d time.Duration, s float64, r time.Duration) func () {
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return func () {
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waveform = w
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adsr = ADSR {
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a * time.Millisecond,
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d * time.Millisecond,
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s,
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r * time.Millisecond,
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}
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waveformList.Select(w)
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attackSlider .SetValue(adsr.Attack)
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decaySlider .SetValue(adsr.Decay)
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sustainSlider.SetValue(adsr.Sustain)
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releaseSlider.SetValue(adsr.Release)
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}
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}
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patchList := elements.NewList (
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elements.NewListEntry ("Bones", patch (
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0, 0, 100, 0.0, 0)),
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elements.NewListEntry ("Staccato", patch (
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4, 70, 500, 0, 0)),
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elements.NewListEntry ("Sustain", patch (
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4, 70, 200, 0.8, 500)),
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elements.NewListEntry ("Upright", patch (
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1, 0, 500, 0.4, 70)),
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elements.NewListEntry ("Space Pad", patch (
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4, 1500, 0, 1.0, 3000)),
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elements.NewListEntry ("Popcorn", patch (
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2, 0, 40, 0.0, 0)),
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elements.NewListEntry ("Racer", patch (
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3, 70, 0, 0.7, 400)),
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elements.NewListEntry ("Reverse", patch (
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2, 3000, 60, 0, 0)),
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)
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patchList.Collapse(0, 32)
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patchScrollBox := containers.NewScrollContainer(false, true)
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piano := fun.NewPiano(2, 5)
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piano.OnPress(playNote)
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piano.OnRelease(stopNote)
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// honestly, if you were doing something like this for real, i'd
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// encourage you to build a custom layout because this is a bit cursed.
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// i need to add more layouts...
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window.Adopt(container)
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controlBar.Adopt(patchColumn, true)
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patchColumn.Adopt(elements.NewLabel("Presets", false), false)
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patchColumn.Adopt(patchScrollBox, true)
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patchScrollBox.Adopt(patchList)
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controlBar.Adopt(elements.NewSpacer(true), false)
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controlBar.Adopt(waveformColumn, false)
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waveformColumn.Adopt(elements.NewLabel("Waveform", false), false)
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waveformColumn.Adopt(waveformList, true)
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controlBar.Adopt(elements.NewSpacer(true), false)
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adsrColumn.Adopt(elements.NewLabel("ADSR", false), false)
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adsrGroup.Adopt(attackSlider, false)
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adsrGroup.Adopt(decaySlider, false)
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adsrGroup.Adopt(sustainSlider, false)
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adsrGroup.Adopt(releaseSlider, false)
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adsrColumn.Adopt(adsrGroup, true)
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adsrColumn.Adopt(gainSlider, false)
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controlBar.Adopt(adsrColumn, false)
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container.Adopt(controlBar, true)
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container.Adopt(piano, false)
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piano.Focus()
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window.OnClose(tomo.Stop)
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window.Show()
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}
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type Patch struct {
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ADSR
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Waveform int
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}
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func stopNote (note music.Note) {
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if _, is := playing[note]; !is { return }
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speaker.Lock()
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playing[note].Release()
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delete(playing, note)
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speaker.Unlock()
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}
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func playNote (note music.Note) {
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streamer, _ := Tone (
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sampleRate,
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int(tuning.Tune(note)),
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waveform,
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gain,
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adsr)
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stopNote(note)
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speaker.Lock()
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playing[note] = streamer
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speaker.Unlock()
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speaker.Play(playing[note])
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}
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// https://github.com/faiface/beep/blob/v1.1.0/generators/toner.go
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// Adapted to be a bit more versatile.
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type toneStreamer struct {
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position float64
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cycles uint64
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delta float64
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waveform int
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gain float64
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adsr ADSR
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released bool
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complete bool
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adsrPhase int
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adsrPosition float64
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adsrDeltas [4]float64
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}
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type ADSR struct {
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Attack time.Duration
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Decay time.Duration
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Sustain float64
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Release time.Duration
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}
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func Tone (
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sampleRate beep.SampleRate,
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frequency int,
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waveform int,
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gain float64,
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adsr ADSR,
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) (
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*toneStreamer,
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error,
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) {
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if int(sampleRate) / frequency < 2 {
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return nil, errors.New (
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"tone generator: samplerate must be at least " +
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"2 times greater then frequency")
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}
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tone := new(toneStreamer)
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tone.waveform = waveform
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tone.position = 0.0
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steps := float64(sampleRate) / float64(frequency)
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tone.delta = 1.0 / steps
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tone.gain = gain
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if adsr.Attack < time.Millisecond { adsr.Attack = time.Millisecond }
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if adsr.Decay < time.Millisecond { adsr.Decay = time.Millisecond }
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if adsr.Release < time.Millisecond { adsr.Release = time.Millisecond }
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tone.adsr = adsr
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attackSteps := adsr.Attack.Seconds() * float64(sampleRate)
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decaySteps := adsr.Decay.Seconds() * float64(sampleRate)
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releaseSteps := adsr.Release.Seconds() * float64(sampleRate)
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tone.adsrDeltas[0] = 1 / attackSteps
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tone.adsrDeltas[1] = 1 / decaySteps
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tone.adsrDeltas[2] = 0
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tone.adsrDeltas[3] = 1 / releaseSteps
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return tone, nil
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}
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func (tone *toneStreamer) nextSample () (sample float64) {
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switch tone.waveform {
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case 0:
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sample = math.Sin(tone.position * 2.0 * math.Pi)
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case 1:
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if tone.position > 0.5 {
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sample = 1
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} else {
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sample = -1
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}
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case 2:
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sample = (tone.position - 0.5) * 2
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case 3:
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sample = 1 - math.Abs(tone.position - 0.5) * 4
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case 4:
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unison := 5
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detuneDelta := 0.00005
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detune := 0.0 - (float64(unison) / 2) * detuneDelta
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for i := 0; i < unison; i ++ {
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_, offset := math.Modf(detune * float64(tone.cycles) + tone.position)
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sample += (offset - 0.5) * 2
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detune += detuneDelta
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}
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sample /= float64(unison)
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}
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adsrGain := 0.0
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switch tone.adsrPhase {
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case 0: adsrGain = tone.adsrPosition
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if tone.adsrPosition > 1 {
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tone.adsrPosition = 0
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tone.adsrPhase = 1
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}
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case 1: adsrGain = 1 + tone.adsrPosition * (tone.adsr.Sustain - 1)
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if tone.adsrPosition > 1 {
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tone.adsrPosition = 0
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tone.adsrPhase = 2
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}
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case 2: adsrGain = tone.adsr.Sustain
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if tone.released {
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tone.adsrPhase = 3
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}
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case 3: adsrGain = (1 - tone.adsrPosition) * tone.adsr.Sustain
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if tone.adsrPosition > 1 {
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tone.adsrPosition = 0
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tone.complete = true
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}
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}
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sample *= adsrGain * adsrGain
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tone.adsrPosition += tone.adsrDeltas[tone.adsrPhase]
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_, tone.position = math.Modf(tone.position + tone.delta)
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tone.cycles ++
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return
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}
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func (tone *toneStreamer) Stream (buf [][2]float64) (int, bool) {
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if tone.complete {
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return 0, false
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}
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for i := 0; i < len(buf); i++ {
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sample := 0.0
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if !tone.complete {
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sample = tone.nextSample() * tone.gain
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}
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buf[i] = [2]float64{sample, sample}
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}
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return len(buf), true
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}
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func (tone *toneStreamer) Err () error {
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return nil
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}
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func (tone *toneStreamer) Release () {
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tone.released = true
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}
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