feat(tracker): add simple BPM & octave buttons

This commit is contained in:
vsariola
2021-01-07 19:25:16 +02:00
parent 1d524b5815
commit 82d26b79a4
3 changed files with 101 additions and 14 deletions

View File

@ -4,7 +4,9 @@ import (
"fmt"
"sync"
"gioui.org/font/gofont"
"gioui.org/widget"
"gioui.org/widget/material"
"github.com/vsariola/sointu"
"github.com/vsariola/sointu/bridge"
)
@ -24,7 +26,13 @@ type Tracker struct {
ActiveTrack int
CurrentOctave byte
NoteTracking bool
Theme *material.Theme
OctaveUpBtn *widget.Clickable
OctaveDownBtn *widget.Clickable
BPMUpBtn *widget.Clickable
BPMDownBtn *widget.Clickable
sequencer *Sequencer
ticked chan struct{}
setPlaying chan bool
rowJump chan int
@ -75,9 +83,7 @@ func (t *Tracker) sequencerLoop(closer <-chan struct{}) {
panic("cannot create a synth with the default patch")
}
curVoices := make([]int, 32)
sequencer := NewSequencer(synth, 44100*60/(4*t.song.BPM), func() ([]Note, bool) {
t.songPlayMutex.RLock()
defer t.songPlayMutex.RUnlock()
t.sequencer = NewSequencer(synth, 44100*60/(4*t.song.BPM), func() ([]Note, bool) {
if !t.Playing {
return nil, false
}
@ -121,17 +127,53 @@ func (t *Tracker) sequencerLoop(closer <-chan struct{}) {
case <-closer:
return
default:
sequencer.ReadAudio(buffer)
t.sequencer.ReadAudio(buffer)
output.WriteAudio(buffer)
}
}
}
func (t *Tracker) ChangeOctave(delta int) bool {
newOctave := int(t.CurrentOctave) + delta
if newOctave < 0 {
newOctave = 0
}
if newOctave > 9 {
newOctave = 9
}
if newOctave != int(t.CurrentOctave) {
t.CurrentOctave = byte(newOctave)
return true
}
return false
}
func (t *Tracker) ChangeBPM(delta int) bool {
newBPM := t.song.BPM + delta
if newBPM < 1 {
newBPM = 1
}
if newBPM > 999 {
newBPM = 999
}
if newBPM != int(t.song.BPM) {
t.song.BPM = newBPM
t.sequencer.SetRowLength(44100 * 60 / (4 * t.song.BPM))
return true
}
return false
}
func New(audioContext sointu.AudioContext) *Tracker {
t := &Tracker{
Theme: material.NewTheme(gofont.Collection()),
QuitButton: new(widget.Clickable),
CurrentOctave: 4,
audioContext: audioContext,
OctaveUpBtn: new(widget.Clickable),
OctaveDownBtn: new(widget.Clickable),
BPMUpBtn: new(widget.Clickable),
BPMDownBtn: new(widget.Clickable),
setPlaying: make(chan bool),
rowJump: make(chan int),
patternJump: make(chan int),