/
switch.go
65 lines (57 loc) · 1.38 KB
/
switch.go
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package module
import (
"fmt"
"buddin.us/eolian/dsp"
"github.com/mitchellh/mapstructure"
)
func init() {
Register("Switch", func(c Config) (Patcher, error) {
var config struct {
Size int
}
if err := mapstructure.Decode(c, &config); err != nil {
return nil, err
}
if config.Size == 0 {
config.Size = 4
}
return newSeqSwitch(config.Size)
})
}
type seqSwitch struct {
IO
clock, reset *In
sources []*In
step int
lastClock, lastReset dsp.Float64
}
func newSeqSwitch(size int) (*seqSwitch, error) {
m := &seqSwitch{
clock: NewInBuffer("clock", dsp.Float64(0)),
reset: NewInBuffer("reset", dsp.Float64(0)),
lastClock: -1,
}
inputs := []*In{m.clock, m.reset}
for i := 0; i < size; i++ {
in := NewInBuffer(fmt.Sprintf("%d/input", i), dsp.Float64(0))
m.sources = append(m.sources, in)
inputs = append(inputs, in)
}
return m, m.Expose("Switch", inputs, []*Out{{Name: "output", Provider: dsp.Provide(m)}})
}
func (s *seqSwitch) Process(out dsp.Frame) {
clock := s.clock.ProcessFrame()
reset := s.reset.ProcessFrame()
for i := 0; i < len(s.sources); i++ {
s.sources[i].ProcessFrame()
}
for i := range out {
if s.lastReset < 0 && reset[i] > 0 {
s.step = 0
} else if s.lastClock < 0 && clock[i] > 0 {
s.step = (s.step + 1) % len(s.sources)
}
out[i] = s.sources[s.step].LastFrame()[i]
s.lastClock = clock[i]
}
}