func NewBeatsKey(idx int) Key {
osc := snd.NewOscil(sawsine, notes[idx], snd.NewOscil(triangle, 4, nil))
dmp := snd.NewDamp(bpm.Dur(), osc)
d := snd.BPM(float64(bpm) * 1.25).Dur()
dmp1 := snd.NewDamp(d, osc)
drv := snd.NewDrive(d, osc)
mix := snd.NewMixer(dmp, dmp1, drv)
frz := snd.NewFreeze(bpm.Dur()*4, mix)
adsr := snd.NewADSR(250*ms, 500*ms, 300*ms, 400*ms, 0.85, 1.0, frz)
key := &BeatsKey{snd.NewInstrument(adsr), adsr}
key.Off()
return key
}
func onStart(ctx gl.Context) {
ctx.Enable(gl.BLEND)
ctx.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
if err := al.OpenDevice(buffers); err != nil {
log.Fatal(err)
}
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 = snd.NewWaveform(ctx, 2, mastergain)
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)
piano = NewPiano()
pianowf, err = snd.NewWaveform(ctx, 1, piano)
if err != nil {
log.Fatal(err)
}
al.AddSource(pan)
yoff := float32(-0) //.12)
btnreverb = snd.NewButton(ctx, -0.98, 0.96+yoff, 0.2, -0.2)
btnreverb.SetActiveColor(0, 1, 0, 0.5)
btnreverb.SetActive(true)
btnlowpass = snd.NewButton(ctx, -0.76, 0.96+yoff, 0.2, -0.2)
btnlowpass.SetActiveColor(0, 1, 1, 0.5)
btnlowpass.SetActive(true)
btnmetronome = snd.NewButton(ctx, -0.54, 0.96+yoff, 0.2, -0.2)
btnmetronome.SetActiveColor(0, 0, 1, 0.5)
btnloop = snd.NewLoopButton(snd.NewButton(ctx, -0.32, 0.96+yoff, 0.2, -0.2), loop)
btnloop.SetActiveColor(1, 0, 0, 0.5)
btnsndbank = snd.NewButton(ctx, 0.78, 0.96+yoff, 0.2, -0.2)
btnsndbank.SetActive(true)
btnsndbank.SetActiveColor(sndbankcolor())
}