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feat: add the ability to use Sointu as a sync-tracker

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There is a new "sync" opcode that saves the top-most signal every 256 samples to the new "syncBuffer" output. Additionally, you can enable saving the current fractional row as sync[0], avoiding calculating the beat in the shader, but also calculating the beat correctly when the beat is modulated.
This commit is contained in:
vsariola
2021-03-09 23:47:27 +02:00
parent a3bdf565fd
commit 99dbdfe223
30 changed files with 375 additions and 88 deletions
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20
vm/interpreter.go
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@ -115,7 +115,7 @@ func (s *Interpreter) Update(patch sointu.Patch) error {
return nil
}
func (s *Interpreter) Render(buffer []float32, maxtime int) (samples int, time int, renderError error) {
func (s *Interpreter) Render(buffer []float32, syncBuf []float32, maxtime int) (samples int, syncs int, time int, renderError error) {
defer func() {
if err := recover(); err != nil {
renderError = fmt.Errorf("render panicced: %v", err)
@ -133,6 +133,10 @@ func (s *Interpreter) Render(buffer []float32, maxtime int) (samples int, time i
voicesRemaining := s.bytePatch.NumVoices
voices := s.synth.voices[:]
units := voices[0].units[:]
if byte(s.synth.globalTime) == 0 { // every 256 samples
syncBuf[0], syncBuf = float32(time), syncBuf[1:]
syncs++
}
for voicesRemaining > 0 {
op := commands[0]
commands = commands[1:]
@ -152,7 +156,7 @@ func (s *Interpreter) Render(buffer []float32, maxtime int) (samples int, time i
}
tcount := transformCounts[opNoStereo-1]
if len(values) < tcount {
return samples, time, errors.New("value stream ended prematurely")
return samples, syncs, time, errors.New("value stream ended prematurely")
}
voice := &voices[0]
unit := &units[0]
@ -523,16 +527,20 @@ func (s *Interpreter) Render(buffer []float32, maxtime int) (samples int, time i
if stereo {
stack = append(stack, gain)
}
case opSync:
if byte(s.synth.globalTime) == 0 { // every 256 samples
syncBuf[0], syncBuf = float32(stack[l-1]), syncBuf[1:]
}
default:
return samples, time, errors.New("invalid / unimplemented opcode")
return samples, syncs, time, errors.New("invalid / unimplemented opcode")
}
units = units[1:]
}
if len(stack) < 4 {
return samples, time, errors.New("stack underflow")
return samples, syncs, time, errors.New("stack underflow")
}
if len(stack) > 4 {
return samples, time, errors.New("stack not empty")
return samples, syncs, time, errors.New("stack not empty")
}
buffer[0] = synth.outputs[0]
buffer[1] = synth.outputs[1]
@ -544,7 +552,7 @@ func (s *Interpreter) Render(buffer []float32, maxtime int) (samples int, time i
s.synth.globalTime++
}
s.stack = stack[:0]
return samples, time, nil
return samples, syncs, time, nil
}
func (s *synth) rand() float32 {