func NewPianoKey(idx int) Key {
const phasefac float64 = 0.5063999999999971
k := &PianoKey{}
k.freq = notes[idx]
k.mod = snd.NewOscil(sqsine, k.freq/2, nil)
k.osc = snd.NewOscil(sawtooth, k.freq, k.mod)
k.phs = snd.NewOscil(square, k.freq*phasefac, nil)
k.osc.SetPhase(k.phs)
freql := k.freq * math.Pow(2, -10.0/1200)
k.modl = snd.NewOscil(sqsine, freql/2, nil)
k.oscl = snd.NewOscil(sawtooth, freql, k.modl)
k.phsl = snd.NewOscil(square, freql*phasefac, nil)
k.oscl.SetPhase(k.phsl)
freqr := k.freq * math.Pow(2, 10.0/1200)
k.modr = snd.NewOscil(sqsine, freqr/2, nil)
k.oscr = snd.NewOscil(sawtooth, freqr, k.modr)
k.phsr = snd.NewOscil(square, freqr*phasefac, nil)
k.oscr.SetPhase(k.phsr)
oscmix := snd.NewMixer(k.osc, k.oscl, k.oscr)
k.reldur = 1050 * ms
k.dur = 280*ms + k.reldur
k.adsr0 = snd.NewADSR(30*ms, 50*ms, 200*ms, k.reldur, 0.4, 1, oscmix)
k.adsr1 = snd.NewADSR(1*ms, 278*ms, 1*ms, k.reldur, 0.4, 1, oscmix)
adsrmix := snd.NewMixer(k.adsr0, k.adsr1)
k.gain = snd.NewGain(snd.Decibel(-10).Amp(), adsrmix)
k.Instrument = snd.NewInstrument(k.gain)
k.Off()
return k
}
func onStart(ctx gl.Context) {
ctx.Enable(gl.BLEND)
ctx.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
ctx.Enable(gl.CULL_FACE)
ctx.CullFace(gl.BACK)
if err := al.OpenDevice(buffers); err != nil {
log.Fatal(err)
}
env.Load(ctx)
env.LoadIcons(ctx)
env.LoadGlyphs(ctx)
toolbar = env.NewToolbar(ctx)
toolbar.Title.SetText("piano")
toolbar.Title.SetTextColor(material.White)
toolbar.Nav.SetIconColor(material.White)
btnLoop := env.NewButton(ctx)
toolbar.AddAction(btnLoop)
btnLoop.SetIcon(icon.AvFiberSmartRecord)
btnLoop.SetIconColor(material.White)
btnLoop.OnPress = func() {
if loop.Recording() {
btnLoop.SetIconColor(material.White)
loop.Stop()
} else {
btnLoop.SetIconColor(env.Palette().Accent)
loop.Record()
}
}
btnMetronome := env.NewButton(ctx)
toolbar.AddAction(btnMetronome)
btnMetronome.SetIcon(icon.AvSlowMotionVideo)
btnMetronome.SetIconColor(material.White)
btnMetronome.OnPress = func() {
if metronome.IsOff() {
metronome.On()
btnMetronome.SetIconColor(env.Palette().Accent)
} else {
metronome.Off()
btnMetronome.SetIconColor(material.White)
}
}
btnLowpass := env.NewButton(ctx)
toolbar.AddAction(btnLowpass)
btnLowpass.SetIcon(icon.AvSubtitles)
btnLowpass.SetIconColor(env.Palette().Accent)
btnLowpass.OnPress = func() {
lowpass.SetPassthrough(!lowpass.Passthrough())
if lowpass.Passthrough() {
btnLowpass.SetIconColor(material.White)
} else {
btnLowpass.SetIconColor(env.Palette().Accent)
}
}
btnReverb := env.NewButton(ctx)
toolbar.AddAction(btnReverb)
btnReverb.SetIcon(icon.AvSurroundSound)
btnReverb.SetIconColor(env.Palette().Accent)
btnReverb.OnPress = func() {
if reverb.IsOff() {
reverb.On()
keygain.SetAmp(snd.Decibel(-3).Amp())
btnReverb.SetIconColor(env.Palette().Accent)
} else {
reverb.Off()
keygain.SetAmp(snd.Decibel(3).Amp())
btnReverb.SetIconColor(material.White)
}
}
btnNext = env.NewFloatingActionButton(ctx)
btnNext.Mini = true
btnNext.SetColor(env.Palette().Accent)
btnNext.SetIcon(icon.AvSkipNext)
btnNext.OnPress = func() {
sndbankpos = (sndbankpos + 1) % len(sndbank)
go makekeys()
}
decor = env.NewMaterial(ctx)
decor.SetColor(material.BlueGrey900)
tseq := make(map[touch.Sequence]int)
for i := range btnkeys {
btnkeys[i] = env.NewButton(ctx)
j := i
btnkeys[i].OnTouch = func(ev touch.Event) {
switch ev.Type {
case touch.TypeBegin:
keys[j].Press()
tseq[ev.Sequence] = j
case touch.TypeMove:
// TODO drag finger off piano and it still plays, should stop
if last, ok := tseq[ev.Sequence]; ok {
if j != last {
keys[last].Release()
keys[j].Press()
tseq[ev.Sequence] = j
}
}
case touch.TypeEnd:
keys[j].Release()
delete(tseq, ev.Sequence)
}
}
}
var err error
keymix = snd.NewMixer()
go makekeys()
lowpass = snd.NewLowPass(773, keymix)
keygain = snd.NewGain(snd.Decibel(-3).Amp(), lowpass)
dly := snd.NewDelay(29*time.Millisecond, keygain)
tap0 := snd.NewTap(19*time.Millisecond, dly)
tap1 := snd.NewTap(13*time.Millisecond, dly)
tap2 := snd.NewTap(7*time.Millisecond, dly)
cmb := snd.NewComb(snd.Decibel(-3).Amp(), 11*time.Millisecond, snd.NewMixer(dly, tap0, tap1, tap2))
reverb = snd.NewLowPass(2000, cmb)
dlymix := snd.NewMixer(reverb, keygain)
loop = snd.NewLoopFrames(loopdur, dlymix)
loop.SetBPM(bpm)
loopmix := snd.NewMixer(dlymix, loop)
master = snd.NewMixer(loopmix)
mastergain = snd.NewGain(snd.Decibel(-6).Amp(), master)
mixwf, err = NewWaveform(ctx, 2, mastergain)
mixwf.SetColor(material.BlueGrey700)
if err != nil {
log.Fatal(err)
}
pan := snd.NewPan(0, mixwf)
mtrosc := snd.NewOscil(sine, 440, nil)
mtrdmp := snd.NewDamp(bpm.Dur(), mtrosc)
metronome = snd.NewMixer(mtrdmp)
metronome.Off()
master.Append(metronome)
al.AddSource(pan)
}