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gamescene.go
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gamescene.go
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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2022 Hajime Hoshi
package main
import (
_ "embed"
"fmt"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
"github.com/hajimehoshi/ebiten/v2/audio/wav"
"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2/text"
"image/color"
"math"
"strings"
)
//go:embed bg.kage
var bgKage []byte
type GameScene struct {
bgShader *ebiten.Shader
sequence *Sequence
gameState GameState
bgAlpha float64
logoAlpha float64
showPressSpace bool
gaugeAlpha float64
showRecord bool
countDown int
topVelocity int
lastPosition int
audioContext *audio.Context
bgmPlayer *audio.Player
seStartPlayer *audio.Player
seEndPlayer *audio.Player
}
func (g *GameScene) Update(sceneSwitcher SceneSwitcher) error {
if g.bgShader == nil {
s, err := ebiten.NewShader(bgKage)
if err != nil {
return err
}
g.bgShader = s
}
if g.sequence == nil {
g.sequence = &Sequence{}
g.sequence.AddTask(NewTimerTask(func(counter int, maxCounter int) error {
g.bgAlpha = 0
g.logoAlpha = float64(counter) / float64(maxCounter)
return nil
}, ebiten.MaxTPS()/2))
g.sequence.AddTask(NewTimerTask(func(counter int, maxCounter int) error {
if counter == 0 {
g.gameState.StartDemo()
}
g.bgAlpha = float64(counter) / float64(maxCounter)
g.logoAlpha = 1
g.gaugeAlpha = float64(counter) / float64(maxCounter)
return nil
}, ebiten.MaxTPS()))
}
var addGameLoopTasks func()
addGameLoopTasks = func() {
g.sequence.AddTask(func() error {
g.showPressSpace = true
if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
g.showPressSpace = false
g.gameState.Reset()
return TaskEnded
}
return nil
})
g.sequence.AddTask(NewAllTask(func() error {
// Wait the game state is ready to start.
if !g.gameState.CanStart() {
return nil
}
return TaskEnded
}, NewTimerTask(func(counter int, maxCounter int) error {
// Fade out the logo.
g.bgAlpha = 1
g.logoAlpha = 1 - float64(counter)/float64(maxCounter)
return nil
}, ebiten.MaxTPS()/2)))
g.sequence.AddTask(NewTimerTask(func(counter int, maxCounter int) error {
g.countDown = int(math.Ceil(float64(maxCounter-counter) / float64(ebiten.MaxTPS())))
g.logoAlpha = 0
return nil
}, ebiten.MaxTPS()*3))
g.sequence.AddTask(func() error {
g.countDown = 0
g.gameState.Start()
if err := g.seStartPlayer.Rewind(); err != nil {
return err
}
g.seStartPlayer.Play()
return TaskEnded
})
g.sequence.AddTask(func() error {
if g.gameState.IsPlaying() {
return nil
}
g.showRecord = true
g.topVelocity, g.lastPosition = g.gameState.Record()
g.gameState.StartDemo()
if err := g.seEndPlayer.Rewind(); err != nil {
return err
}
g.seEndPlayer.Play()
return TaskEnded
})
g.sequence.AddTask(NewTimerTask(func(counter int, maxCounter int) error {
// Cool time
return nil
}, ebiten.MaxTPS()))
g.sequence.AddTask(func() error {
g.showPressSpace = true
if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
g.showRecord = false
return TaskEnded
}
return nil
})
g.sequence.AddTask(NewTimerTask(func(counter int, maxCounter int) error {
g.logoAlpha = float64(counter) / float64(maxCounter)
return nil
}, ebiten.MaxTPS()/2))
g.sequence.AddTask(func() error {
addGameLoopTasks()
return TaskEnded
})
}
if g.audioContext == nil {
const sampleRate = 48000
g.audioContext = audio.NewContext(sampleRate)
{
f, err := ResourceFS.Open("bgm.ogg")
if err != nil {
return err
}
defer f.Close()
decoded, err := vorbis.DecodeWithSampleRate(sampleRate, f)
if err != nil {
return err
}
loop := audio.NewInfiniteLoop(decoded, decoded.Length())
p, err := g.audioContext.NewPlayer(loop)
if err != nil {
return err
}
g.bgmPlayer = p
g.bgmPlayer.SetVolume(0.8)
g.bgmPlayer.Play()
}
{
f, err := ResourceFS.Open("start.wav")
if err != nil {
return err
}
defer f.Close()
decoded, err := wav.DecodeWithSampleRate(sampleRate, f)
if err != nil {
return err
}
p, err := g.audioContext.NewPlayer(decoded)
g.seStartPlayer = p
g.seStartPlayer.SetVolume(0.8)
}
{
f, err := ResourceFS.Open("end.wav")
if err != nil {
return err
}
defer f.Close()
decoded, err := wav.DecodeWithSampleRate(sampleRate, f)
if err != nil {
return err
}
p, err := g.audioContext.NewPlayer(decoded)
g.seEndPlayer = p
g.seEndPlayer.SetVolume(0.8)
}
}
addGameLoopTasks()
g.sequence.Update()
g.gameState.Update()
return nil
}
func (g *GameScene) Draw(screen *ebiten.Image) {
if g.sequence == nil {
return
}
// Render the background.
if g.bgAlpha > 0 {
sw, sh := screen.Size()
t := float32(g.gameState.PositionInMillimeter()%1000) / 1000.0
v := float32(g.gameState.VelocityInMeterPerHour()) / 1000.0
screen.DrawRectShader(sw, sh, g.bgShader, &ebiten.DrawRectShaderOptions{
Uniforms: map[string]any{
"Pos": t, // [0, 1]
"Velocity": v,
"Alpha": float32(g.bgAlpha),
},
})
}
// Render the title.
if g.logoAlpha > 0 {
sw, _ := screen.Size()
alpha := g.logoAlpha
clr := color.RGBA{byte(0xff * alpha), byte(0xff * alpha), byte(0xff * alpha), byte(0xff * alpha)}
for i, line := range []string{"Manual", "Linear", "Motor", "Car"} {
f := spaceAgeBig
r := text.BoundString(f, line)
x := (sw-r.Dx())/2 - r.Min.X
y := 144 + 144*i
text.Draw(screen, line, f, x, y, clr)
}
}
if g.countDown > 0 {
sw, _ := screen.Size()
line := fmt.Sprintf("%d", g.countDown)
f := spaceAgeBig
r := text.BoundString(f, line)
x := (sw-r.Dx())/2 - r.Min.X
y := 144
text.Draw(screen, line, f, x, y, color.White)
}
// Render the position and the velocity.
if g.gaugeAlpha > 0 {
sw, sh := screen.Size()
f := spaceAgeSmall
r := text.BoundString(f, "km/h")
offsetY := 32
baseX := sw - (r.Dx() + r.Min.X)
alpha := g.gaugeAlpha
clr := color.RGBA{byte(0xff * alpha), byte(0xff * alpha), byte(0xff * alpha), byte(0xff * alpha)}
for i, line := range []string{"km/h", "m"} {
x := baseX - 48
y := sh + 72*i - 72 - offsetY
text.Draw(screen, line, f, x, y, clr)
}
v := g.gameState.VelocityInMeterPerHour()
vstr := fmt.Sprintf("%d.%03d", v/1000, v%1000)
p := g.gameState.PositionInMillimeter()
pstr := fmt.Sprintf("%d.%03d", p/1000, p%1000)
for j, line := range []string{vstr, pstr} {
x := float64(baseX - 72)
y := float64(sh + 72*j - 72 - offsetY)
renderNumberWithDecimalPoint(screen, line, x, y, alpha)
}
}
// Render the time.
if c := g.gameState.Counter(); c > 0 {
str := fmt.Sprintf("%.2f", float64(c)/float64(ebiten.MaxTPS()))
x := 480.0
y := 96.0
renderNumberWithDecimalPoint(screen, str, x, y, 1)
}
// Render the record
if g.showRecord {
sw, _ := screen.Size()
v := g.topVelocity
p := g.lastPosition
lines := []string{
"Record",
"Top Speed",
fmt.Sprintf("%d.%03d km/h", v/1000, v%1000),
"Distance",
fmt.Sprintf("%d.%03d m", p/1000, p%1000),
}
for i, line := range lines {
f := spaceAgeSmall
r := text.BoundString(f, line)
x := (sw-r.Dx())/2 - r.Min.X
y := 144 + 96*i
text.Draw(screen, line, f, x, y, color.White)
}
}
if g.showPressSpace {
sw, sh := screen.Size()
lines := []string{
"Press Space Key",
}
for _, line := range lines {
f := spaceAgeSmall
r := text.BoundString(f, line)
x := (sw-r.Dx())/2 - r.Min.X
y := sh - 144 - 96
text.Draw(screen, line, f, x, y, color.RGBA{0xa0, 0xa0, 0xa0, 0xff})
}
} else if g.gameState.ShouldShowGuide() {
sw, sh := screen.Size()
var str string
switch g.gameState.Pole() {
case PoleS:
str = "Press N Key"
case PoleN:
str = "Press S Key"
}
lines := []string{
str,
}
for _, line := range lines {
f := spaceAgeSmall
r := text.BoundString(f, line)
x := (sw-r.Dx())/2 - r.Min.X
y := sh - 144 - 96
text.Draw(screen, line, f, x, y, color.RGBA{0xa0, 0xa0, 0xa0, 0xff})
}
}
}
func renderNumberWithDecimalPoint(dst *ebiten.Image, str string, ox, oy float64, alpha float64) {
// TODO: Define a new font.Face to overwrite the kerning.
f := spaceAgeSmall
op := &ebiten.DrawImageOptions{}
dotIndex := strings.Index(str, ".")
for i, glyph := range text.AppendGlyphs(nil, f, str) {
const digitWidth = 108
x := ox
switch {
case i < dotIndex:
x += float64(digitWidth*i + digitWidth*3/4 - digitWidth*len(str))
case i == dotIndex:
x += float64(digitWidth*i + digitWidth*3/8 - digitWidth*len(str))
default:
x += float64(digitWidth*i - digitWidth*len(str))
}
x += float64(digitWidth-glyph.Image.Bounds().Dx()) / 2
y := oy + glyph.Y
op.GeoM.Reset()
op.GeoM.Translate(x, y)
op.ColorM.Reset()
op.ColorM.Scale(1, 1, 1, alpha)
dst.DrawImage(glyph.Image, op)
}
}