playing sounds... kinda

chip8/chip8.go

@@ -1,10 +1,14 @@
 package chip8
 
 import (
+	_ "embed"
 	"encoding/binary"
 	"image"
 )
 
+//go:embed sound.wav
+var Sound []byte
+
 const (
 	MemorySize      = 4096 // 4KB of memory
 	InstructionSize = 2    // 2 bytes long instructions
@@ -21,6 +25,7 @@ const (
 )
 
 type KeyPressed func(key uint8) bool
+type PlaySound func(sound []byte) func()
 
 type ROM struct {
 	Name string
@@ -38,11 +43,14 @@ type Emulator struct {
 	ROM        ROM               // game rom
 	Display    *image.RGBA       // display buffer
 	KeyPressed KeyPressed        // input function
+	PlaySound  PlaySound
+	StopSound  func()
 }
 
-func NewEmulator(keyPressed KeyPressed) *Emulator {
+func NewEmulator(keyPressed KeyPressed, playSound PlaySound) *Emulator {
 	emulator := new(Emulator)
 	emulator.KeyPressed = keyPressed
+	emulator.PlaySound = playSound
 	emulator.Stack = NewStack()
 	emulator.Display = image.NewRGBA(image.Rect(0, 0, Width, Height))
 	emulator.Reset()
@@ -93,7 +101,17 @@ func (emulator *Emulator) UpdateTimers() {
 		emulator.DT -= 1
 	}
 	if emulator.ST > 0 {
+		if emulator.StopSound == nil {
+			_ = 1
+			emulator.StopSound = emulator.PlaySound(Sound)
+		}
+
 		emulator.ST -= 1
+	} else {
+		if emulator.StopSound != nil {
+			emulator.StopSound()
+			emulator.StopSound = nil
+		}
 	}
 }
 

go.mod

@@ -10,6 +10,7 @@ require (
 require (
 	github.com/davecgh/go-spew v1.1.0 // indirect
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20210727001814-0db043d8d5be // indirect
+	github.com/hajimehoshi/oto/v2 v2.1.0-alpha.2 // indirect
 	github.com/jezek/xgb v0.0.0-20210312150743-0e0f116e1240 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect

go.sum

@@ -8,7 +8,9 @@ github.com/hajimehoshi/ebiten/v2 v2.2.5 h1:i6NdS6pEi5kgfTh+4XAVCVtCXxjTyxzU1cj1o
 github.com/hajimehoshi/ebiten/v2 v2.2.5/go.mod h1:olKl/qqhMBBAm2oI7Zy292nCtE+nitlmYKNF3UpbFn0=
 github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41/go.mod h1:CqqAHp7Dk/AqQiwuhV1yT2334qbA/tFWQW0MD2dGqUE=
 github.com/hajimehoshi/go-mp3 v0.3.2/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
+github.com/hajimehoshi/oto v0.6.1 h1:7cJz/zRQV4aJvMSSRqzN2TImoVVMpE0BCY4nrNJaDOM=
 github.com/hajimehoshi/oto v0.6.1/go.mod h1:0QXGEkbuJRohbJaxr7ZQSxnju7hEhseiPx2hrh6raOI=
+github.com/hajimehoshi/oto/v2 v2.1.0-alpha.2 h1:DV2DcbY3YLuLB9gI9R1GT9TPOo92lUeWveV8ci1sBLk=
 github.com/hajimehoshi/oto/v2 v2.1.0-alpha.2/go.mod h1:rUKQmwMkqmRxe+IAof9+tuYA2ofm8cAWXFmSfzDN8vQ=
 github.com/jakecoffman/cp v1.1.0/go.mod h1:JjY/Fp6d8E1CHnu74gWNnU0+b9VzEdUVPoJxg2PsTQg=
 github.com/jezek/xgb v0.0.0-20210312150743-0e0f116e1240 h1:dy+DS31tGEGCsZzB45HmJJNHjur8GDgtRNX9U7HnSX4=

main.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/audio"
 	"github.com/tangzero/chip8-emulator/chip8"
 )
 
@@ -50,8 +51,9 @@ var KeyMapping = []ebiten.Key{
 }
 
 type UI struct {
-	Emulator *chip8.Emulator
+	Emulator     *chip8.Emulator
-	State    State
+	State        State
+	AudioContext *audio.Context
 }
 
 func (ui *UI) Run() {
@@ -85,17 +87,27 @@ func (ui *UI) Layout(outsideWidth, outsideHeight int) (int, int) {
 	return Width, Height
 }
 
-func KeyPressed(key uint8) bool {
+func (ui *UI) KeyPressed(key uint8) bool {
 	return ebiten.IsKeyPressed(KeyMapping[key])
 }
 
+func (ui *UI) PlaySound(sound []byte) func() {
+	player := ui.AudioContext.NewPlayerFromBytes(sound)
+	player.SetVolume(0.3)
+	player.Play()
+	return func() {
+		player.Pause()
+		_ = player.Close()
+	}
+}
+
 func main() {
 	rom := LoadROM()
 
-	ui := UI{
+	ui := UI{}
-		Emulator: chip8.NewEmulator(KeyPressed),
+	ui.Emulator = chip8.NewEmulator(ui.KeyPressed, ui.PlaySound)
-		State:    LoadingState,
+	ui.State = LoadingState
-	}
+	ui.AudioContext = audio.NewContext(44100)
 	ui.Emulator.LoadROM(rom)
 
 	ebiten.SetWindowSize(Width, Height)