audio: Remove audio.Tick

internal/audio/audio.go

@@ -23,8 +23,7 @@ var audioEnabled = false
 const SampleRate = 44100
 
 type channel struct {
-	buffer                []byte
-	nextInsertionPosition int
+	buffer []byte
 }
 
 const MaxChannel = 32
@@ -53,7 +52,7 @@ func withChannels(f func()) {
 
 func isPlaying(channel int) bool {
 	ch := channels[channel]
-	return ch.nextInsertionPosition < len(ch.buffer)
+	return 0 < len(ch.buffer)
 }
 
 func channelAt(i int) *channel {
@@ -88,12 +87,6 @@ func Queue(channel int, data []byte) bool {
 	return result
 }
 
-func Tick() {
-	for _, ch := range channels {
-		ch.nextInsertionPosition += SampleRate * 4 / 60
-	}
-}
-
 func min(a, b int) int {
 	if a < b {
 		return a
@@ -132,11 +125,6 @@ func loadChannelBuffer(channel int, bufferSize int) []byte {
 		input := ch.buffer[:length]
 		ch.buffer = ch.buffer[length:]
 
-		ch.nextInsertionPosition -= bufferSize
-		if ch.nextInsertionPosition < 0 {
-			ch.nextInsertionPosition = 0
-		}
-
 		r = input
 	})
 	return r

run.go

@@ -15,9 +15,9 @@
 package ebiten
 
 import (
-	"github.com/hajimehoshi/ebiten/internal/audio"
-	"github.com/hajimehoshi/ebiten/internal/ui"
 	"time"
+
+	"github.com/hajimehoshi/ebiten/internal/ui"
 )
 
 var runContext = &struct {
@@ -112,7 +112,6 @@ func Run(f func(*Image) error, width, height, scale int, title string) error {
 			if err := f(graphicsContext.screen); err != nil {
 				return err
 			}
-			audio.Tick()
 		}
 		if err := graphicsContext.postUpdate(); err != nil {
 			return err