mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
parent
fd382d26ae
commit
a12e32faf9
@ -51,20 +51,20 @@ var score = strings.Replace(
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" ", "", -1)
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" ", "", -1)
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// square fills out with square wave values with the specified volume, frequency and sequence.
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// square fills out with square wave values with the specified volume, frequency and sequence.
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func square(out []int16, volume float64, freq float64, sequence float64) {
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func square(out []float32, volume float32, freq float32, sequence float32) {
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if freq == 0 {
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if freq == 0 {
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for i := 0; i < len(out); i++ {
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for i := 0; i < len(out); i++ {
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out[i] = 0
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out[i] = 0
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}
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}
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return
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return
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}
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}
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length := int(float64(sampleRate) / freq)
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length := int(sampleRate / freq)
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if length == 0 {
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if length == 0 {
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panic("invalid freq")
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panic("invalid freq")
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}
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}
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for i := 0; i < len(out); i++ {
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for i := 0; i < len(out); i++ {
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a := int16(volume * math.MaxInt16)
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a := volume
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if i%length < int(float64(length)*sequence) {
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if i%length < int(float32(length)*sequence) {
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a = -a
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a = -a
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}
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}
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out[i] = a
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out[i] = a
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@ -72,16 +72,22 @@ func square(out []int16, volume float64, freq float64, sequence float64) {
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}
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}
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// toBytes returns the 2ch little endian 16bit byte sequence with the given left/right sequence.
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// toBytes returns the 2ch little endian 16bit byte sequence with the given left/right sequence.
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func toBytes(l, r []int16) []byte {
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func toBytes(l, r []float32) []byte {
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if len(l) != len(r) {
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if len(l) != len(r) {
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panic("len(l) must equal to len(r)")
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panic("len(l) must equal to len(r)")
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}
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}
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b := make([]byte, len(l)*4)
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b := make([]byte, len(l)*8)
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for i := range l {
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for i := range l {
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b[4*i] = byte(l[i])
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lv := math.Float32bits(l[i])
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b[4*i+1] = byte(l[i] >> 8)
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rv := math.Float32bits(r[i])
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b[4*i+2] = byte(r[i])
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b[8*i] = byte(lv)
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b[4*i+3] = byte(r[i] >> 8)
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b[8*i+1] = byte(lv >> 8)
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b[8*i+2] = byte(lv >> 16)
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b[8*i+3] = byte(lv >> 24)
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b[8*i+4] = byte(rv)
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b[8*i+5] = byte(rv >> 8)
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b[8*i+6] = byte(rv >> 16)
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b[8*i+7] = byte(rv >> 24)
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}
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}
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return b
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return b
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}
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}
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@ -109,8 +115,8 @@ func (g *Game) playNote(scoreIndex int) rune {
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return rune(note)
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return rune(note)
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}
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}
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freqs := []float64{freqC, freqD, freqE, freqF, freqG, freqA * 2, freqB * 2}
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freqs := []float32{freqC, freqD, freqE, freqF, freqG, freqA * 2, freqB * 2}
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freq := 0.0
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var freq float32
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switch {
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switch {
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case 'A' <= note && note <= 'B':
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case 'A' <= note && note <= 'B':
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freq = freqs[int(note)+len(freqs)-int('C')]
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freq = freqs[int(note)+len(freqs)-int('C')]
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@ -122,12 +128,12 @@ func (g *Game) playNote(scoreIndex int) rune {
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const vol = 1.0 / 16.0
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const vol = 1.0 / 16.0
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size := (ebiten.TPS()/2 - 2) * sampleRate / ebiten.TPS()
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size := (ebiten.TPS()/2 - 2) * sampleRate / ebiten.TPS()
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l := make([]int16, size)
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l := make([]float32, size)
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r := make([]int16, size)
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r := make([]float32, size)
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square(l, vol, freq, 0.25)
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square(l, vol, freq, 0.25)
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square(r, vol, freq, 0.25)
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square(r, vol, freq, 0.25)
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p := g.audioContext.NewPlayerFromBytes(toBytes(l, r))
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p := g.audioContext.NewPlayerF32FromBytes(toBytes(l, r))
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p.Play()
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p.Play()
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return rune(note)
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return rune(note)
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