~whereswaldon/chipalee: main: basic organ with sine waves and one octave

4 files changed, 512 insertions(+), 0 deletions(-)

A README.md
A go.mod
A go.sum
A main.go

A  => README.md +7 -0

@@ 1,7 @@
+## Chipalee - Silly Chiptune Organ
+
+A silly little keyboard-driven software organ that I wrote to entertain
+my newborn daughter. It's named for her (Rosalee).
+
+See the source code for license details. There's more than one because
+I borrowed some code.

A  => go.mod +29 -0

@@ 1,29 @@
+module git.sr.ht/~whereswaldon/chipalee
+
+go 1.18
+
+require (
+	gioui.org v0.0.0-20220517073035-79f037f983a7
+	github.com/hajimehoshi/oto/v2 v2.1.0
+	golang.org/x/exp v0.0.0-20220516143420-24438e51023a
+)
+
+require (
+	gioui.org/cmd v0.0.0-20220508120214-35e56c5af956 // indirect
+	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 // indirect
+	gioui.org/shader v1.0.6 // indirect
+	github.com/akavel/rsrc v0.10.1 // indirect
+	github.com/benoitkugler/textlayout v0.1.1 // indirect
+	github.com/gioui/uax v0.2.1-0.20220325163150-e3d987515a12 // indirect
+	github.com/go-text/typesetting v0.0.0-20220411150340-35994bc27a7b // indirect
+	github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 // indirect
+	github.com/shurcooL/go-goon v0.0.0-20210110234559-7585751d9a17 // indirect
+	golang.org/x/exp/shiny v0.0.0-20220516143420-24438e51023a // indirect
+	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d // indirect
+	golang.org/x/mod v0.6.0-dev.0.20211013180041-c96bc1413d57 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/tools v0.1.8-0.20211029000441-d6a9af8af023 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)

A  => go.sum +115 -0

@@ 1,115 @@
+eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3 h1:djFprmHZgrSepsHAIRMp5UJn3PzsoTg9drI+BDmif5Q=
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+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

A  => main.go +361 -0

@@ 1,361 @@
+// Copyright 2019 The Oto Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"flag"
+	"image/color"
+	"io"
+	"log"
+	"math"
+	"strings"
+
+	"gioui.org/app"
+	"gioui.org/font/gofont"
+	"gioui.org/io/key"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/widget"
+	"gioui.org/widget/material"
+	"github.com/hajimehoshi/oto/v2"
+	"golang.org/x/exp/maps"
+)
+
+/* Code starting here from the oto project under the terms of the Apache 2.0 license */
+var (
+	sampleRate      = flag.Int("samplerate", 44100, "sample rate")
+	channelNum      = flag.Int("channelnum", 2, "number of channel")
+	bitDepthInBytes = flag.Int("bitdepthinbytes", 2, "bit depth in bytes")
+)
+
+type SineWave struct {
+	freq   float64
+	length int64
+	pos    int64
+
+	remaining []byte
+}
+
+func NewSineWave(freq float64) *SineWave {
+	return &SineWave{
+		freq:   freq,
+		length: math.MaxInt,
+	}
+}
+
+func (s *SineWave) Read(buf []byte) (int, error) {
+	if len(s.remaining) > 0 {
+		n := copy(buf, s.remaining)
+		copy(s.remaining, s.remaining[n:])
+		s.remaining = s.remaining[:len(s.remaining)-n]
+		return n, nil
+	}
+
+	if s.pos == s.length {
+		return 0, io.EOF
+	}
+
+	eof := false
+	if s.pos+int64(len(buf)) > s.length {
+		buf = buf[:s.length-s.pos]
+		eof = true
+	}
+
+	var origBuf []byte
+	if len(buf)%4 > 0 {
+		origBuf = buf
+		buf = make([]byte, len(origBuf)+4-len(origBuf)%4)
+	}
+
+	length := float64(*sampleRate) / float64(s.freq)
+
+	num := (*bitDepthInBytes) * (*channelNum)
+	p := s.pos / int64(num)
+	switch *bitDepthInBytes {
+	case 1:
+		for i := 0; i < len(buf)/num; i++ {
+			const max = 127
+			b := int(math.Sin(2*math.Pi*float64(p)/length) * 0.3 * max)
+			for ch := 0; ch < *channelNum; ch++ {
+				buf[num*i+ch] = byte(b + 128)
+			}
+			p++
+		}
+	case 2:
+		for i := 0; i < len(buf)/num; i++ {
+			const max = 32767
+			b := int16(math.Sin(2*math.Pi*float64(p)/length) * 0.3 * max)
+			for ch := 0; ch < *channelNum; ch++ {
+				buf[num*i+2*ch] = byte(b)
+				buf[num*i+1+2*ch] = byte(b >> 8)
+			}
+			p++
+		}
+	}
+
+	s.pos += int64(len(buf))
+
+	n := len(buf)
+	if origBuf != nil {
+		n = copy(origBuf, buf)
+		s.remaining = buf[n:]
+	}
+
+	if eof {
+		return n, io.EOF
+	}
+	return n, nil
+}
+
+/* End of Apache 2.0 licensed code. */
+
+const (
+	A4  = 440
+	AS4 = 466.2
+	BF4 = AS4
+	B4  = 493.9
+	C5  = 523.3
+	CS5 = 554.4
+	DF5 = CS5
+	D5  = 587.3
+	DS5 = 622.3
+	EF5 = DS5
+	E5  = 659.3
+	F5  = 698.5
+	FS5 = 740
+	GF5 = FS5
+	G5  = 784.0
+	GS5 = 830.6
+	AF5 = GS5
+	A5  = 880
+	AS5 = 932.3
+	BF5 = AS5
+	B5  = 987.8
+
+	IdxA4 = iota
+	IdxAS4
+	IdxBF4
+	IdxB4
+	IdxC5
+	IdxCS5
+	IdxDF5
+	IdxD5
+	IdxDS5
+	IdxEF5
+	IdxE5
+	IdxF5
+	IdxFS5
+	IdxGF5
+	IdxG5
+	IdxGS5
+	IdxAF5
+	IdxA5
+	IdxAS5
+	IdxBF5
+	IdxB5
+)
+
+var freqs = []float64{
+	IdxA4:  A4,
+	IdxAS4: AS4,
+	IdxBF4: BF4,
+	IdxB4:  B4,
+	IdxC5:  C5,
+	IdxCS5: CS5,
+	IdxDF5: DF5,
+	IdxD5:  D5,
+	IdxDS5: DS5,
+	IdxEF5: EF5,
+	IdxE5:  E5,
+	IdxF5:  F5,
+	IdxFS5: FS5,
+	IdxGF5: GF5,
+	IdxG5:  G5,
+	IdxGS5: GS5,
+	IdxAF5: AF5,
+	IdxA5:  A5,
+	IdxAS5: AS5,
+	IdxBF5: BF5,
+	IdxB5:  B5,
+}
+
+var notes = [][]int{
+	IdxA4: {IdxA4},
+	IdxB4: {IdxB4},
+	IdxC5: {IdxC5},
+	IdxD5: {IdxD5},
+	IdxE5: {IdxE5},
+	IdxF5: {IdxF5},
+	IdxG5: {IdxG5},
+	IdxA5: {IdxA5},
+	IdxB5: {IdxB5},
+}
+
+var halfStepUp = [][]int{
+	IdxA4: {IdxA4 + 1},
+	IdxB4: {IdxB4 + 1},
+	IdxC5: {IdxC5 + 1},
+	IdxD5: {IdxD5 + 1},
+	IdxE5: {IdxE5 + 1},
+	IdxF5: {IdxF5 + 1},
+	IdxG5: {IdxG5 + 1},
+	IdxA5: {IdxA5 + 1},
+	IdxB5: {IdxB5 + 1},
+}
+
+var majChords = [][]int{
+	IdxA4: {IdxA4, IdxC5, IdxE5},
+	IdxB4: {IdxB4, IdxD5, IdxF5},
+	IdxC5: {IdxC5, IdxE5, IdxG5},
+	IdxD5: {IdxD5, IdxF5, IdxA4},
+	IdxE5: {IdxE5, IdxG5, IdxB4},
+	IdxF5: {IdxF5, IdxA4, IdxC5},
+	IdxG5: {IdxG5, IdxB4, IdxD5},
+}
+
+var majExtChords = [][]int{
+	IdxA4: {IdxA4, IdxC5, IdxE5, IdxG5},
+	IdxB4: {IdxB4, IdxD5, IdxF5, IdxA4},
+	IdxC5: {IdxC5, IdxE5, IdxG5, IdxB4},
+	IdxD5: {IdxD5, IdxF5, IdxA4, IdxC5},
+	IdxE5: {IdxE5, IdxG5, IdxB4, IdxD5},
+	IdxF5: {IdxF5, IdxA4, IdxC5, IdxE5},
+	IdxG5: {IdxG5, IdxB4, IdxD5, IdxF5},
+}
+
+var keyToIdx = map[string]int{
+	"A": IdxA4,
+	"S": IdxB4,
+	"D": IdxC5,
+	"F": IdxD5,
+	"G": IdxE5,
+	"H": IdxF5,
+	"J": IdxG5,
+	"K": IdxA5,
+	"L": IdxB5,
+}
+
+func keySet() key.Set {
+	baseKeys := maps.Keys(keyToIdx)
+	chords := []string{}
+	chords = append(chords, baseKeys...)
+	for _, key := range baseKeys {
+		chords = append(chords, "Shift-"+key)
+		chords = append(chords, "Ctrl-"+key)
+		chords = append(chords, "Alt-"+key)
+	}
+	return key.Set(strings.Join(chords, "|"))
+
+}
+
+func run(w *app.Window) error {
+	log.Println("run start")
+	c, ready, err := oto.NewContext(*sampleRate, *channelNum, *bitDepthInBytes)
+	if err != nil {
+		return err
+	}
+
+	players := make([]oto.Player, len(freqs))
+	toggleIndex := func(idx int, event key.Event) {
+		if idx >= len(players) {
+			return
+		}
+		if event.State == key.Press {
+			players[idx].Play()
+		} else {
+			players[idx].Pause()
+		}
+	}
+
+	keySet := keySet()
+	th := material.NewTheme(gofont.Collection())
+	audioInit := false
+
+	var ops op.Ops
+	var ed widget.Editor
+	for {
+		select {
+		case event := <-w.Events():
+			switch event := event.(type) {
+			case system.DestroyEvent:
+				return event.Err
+			case system.FrameEvent:
+				gtx := layout.NewContext(&ops, event)
+				if !audioInit {
+					material.Loader(th).Layout(gtx)
+					layout.Center.Layout(gtx, material.Body1(th, "Loading...\nYou may need to click here for loading to complete.").Layout)
+				} else {
+					for _, event := range gtx.Events(w) {
+						switch event := event.(type) {
+						default:
+							log.Printf("%#+v", event)
+						case key.Event:
+							idx, ok := keyToIdx[event.Name]
+							if !ok {
+								continue
+							}
+							var playingFrom [][]int
+							switch {
+							case event.Modifiers.Contain(key.ModShift):
+								playingFrom = majChords
+							case event.Modifiers.Contain(key.ModCtrl):
+								playingFrom = majExtChords
+							case event.Modifiers.Contain(key.ModAlt):
+								playingFrom = halfStepUp
+							default:
+								playingFrom = notes
+							}
+							if idx >= len(playingFrom) {
+								continue
+							}
+							for _, idx := range playingFrom[idx] {
+								toggleIndex(idx, event)
+							}
+						}
+					}
+					key.InputOp{
+						Tag:  w,
+						Keys: keySet,
+					}.Add(gtx.Ops)
+				}
+				// This editor is needed for JS to properly deliver key events
+				// to us.
+				med := material.Editor(th, &ed, "")
+				med.Color = color.NRGBA{}
+				ed.SetText("")
+				med.Layout(gtx)
+				event.Frame(gtx.Ops)
+			}
+		case <-ready:
+			ready = nil
+			audioInit = true
+			for idx, f := range freqs {
+				players[idx] = c.NewPlayer(NewSineWave(f))
+			}
+			log.Println("organ initialized")
+
+		}
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	if err := run(app.NewWindow(app.Title("Chipalee - Silly Chiptune Organ"))); err != nil {
+		panic(err)
+	}
+	app.Main()
+}