ebiten/examples/flappy/main.go

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// Copyright 2018 The Ebiten 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 (
"bytes"
_ "embed"
"flag"
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"fmt"
"image"
"image/color"
_ "image/png"
"log"
"math"
"math/rand"
"time"
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"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/ebitenutil"
raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
resources "github.com/hajimehoshi/ebiten/v2/examples/resources/images/flappy"
"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2/text/v2"
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)
var flagCRT = flag.Bool("crt", false, "enable the CRT effect")
//go:embed crt.go
var crtGo []byte
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func init() {
rand.Seed(time.Now().UnixNano())
}
func floorDiv(x, y int) int {
d := x / y
if d*y == x || x >= 0 {
return d
}
return d - 1
}
func floorMod(x, y int) int {
return x - floorDiv(x, y)*y
}
const (
screenWidth = 640
screenHeight = 480
tileSize = 32
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titleFontSize = fontSize * 1.5
fontSize = 24
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smallFontSize = fontSize / 2
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pipeWidth = tileSize * 2
pipeStartOffsetX = 8
pipeIntervalX = 8
pipeGapY = 5
)
var (
gopherImage *ebiten.Image
tilesImage *ebiten.Image
arcadeFaceSource *text.GoTextFaceSource
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)
func init() {
img, _, err := image.Decode(bytes.NewReader(resources.Gopher_png))
if err != nil {
log.Fatal(err)
}
gopherImage = ebiten.NewImageFromImage(img)
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img, _, err = image.Decode(bytes.NewReader(resources.Tiles_png))
if err != nil {
log.Fatal(err)
}
tilesImage = ebiten.NewImageFromImage(img)
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}
func init() {
s, err := text.NewGoTextFaceSource(bytes.NewReader(fonts.PressStart2P_ttf))
if err != nil {
log.Fatal(err)
}
arcadeFaceSource = s
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}
type Mode int
const (
ModeTitle Mode = iota
ModeGame
ModeGameOver
)
type Game struct {
mode Mode
// The gopher's position
x16 int
y16 int
vy16 int
// Camera
cameraX int
cameraY int
// Pipes
pipeTileYs []int
gameoverCount int
touchIDs []ebiten.TouchID
gamepadIDs []ebiten.GamepadID
audioContext *audio.Context
jumpPlayer *audio.Player
hitPlayer *audio.Player
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}
func NewGame(crt bool) ebiten.Game {
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g := &Game{}
g.init()
if crt {
return &GameWithCRTEffect{Game: g}
}
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return g
}
func (g *Game) init() {
g.x16 = 0
g.y16 = 100 * 16
g.cameraX = -240
g.cameraY = 0
g.pipeTileYs = make([]int, 256)
for i := range g.pipeTileYs {
g.pipeTileYs[i] = rand.Intn(6) + 2
}
if g.audioContext == nil {
g.audioContext = audio.NewContext(48000)
}
jumpD, err := vorbis.DecodeWithoutResampling(bytes.NewReader(raudio.Jump_ogg))
if err != nil {
log.Fatal(err)
}
g.jumpPlayer, err = g.audioContext.NewPlayer(jumpD)
if err != nil {
log.Fatal(err)
}
jabD, err := wav.DecodeWithoutResampling(bytes.NewReader(raudio.Jab_wav))
if err != nil {
log.Fatal(err)
}
g.hitPlayer, err = g.audioContext.NewPlayer(jabD)
if err != nil {
log.Fatal(err)
}
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}
func (g *Game) isKeyJustPressed() bool {
if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
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return true
}
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
return true
}
g.touchIDs = inpututil.AppendJustPressedTouchIDs(g.touchIDs[:0])
if len(g.touchIDs) > 0 {
return true
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}
g.gamepadIDs = ebiten.AppendGamepadIDs(g.gamepadIDs[:0])
for _, g := range g.gamepadIDs {
if ebiten.IsStandardGamepadLayoutAvailable(g) {
if inpututil.IsStandardGamepadButtonJustPressed(g, ebiten.StandardGamepadButtonRightBottom) {
return true
}
if inpututil.IsStandardGamepadButtonJustPressed(g, ebiten.StandardGamepadButtonRightRight) {
return true
}
} else {
// The button 0/1 might not be A/B buttons.
if inpututil.IsGamepadButtonJustPressed(g, ebiten.GamepadButton0) {
return true
}
if inpututil.IsGamepadButtonJustPressed(g, ebiten.GamepadButton1) {
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return true
}
}
}
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return false
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func (g *Game) Update() error {
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switch g.mode {
case ModeTitle:
if g.isKeyJustPressed() {
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g.mode = ModeGame
}
case ModeGame:
g.x16 += 32
g.cameraX += 2
if g.isKeyJustPressed() {
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g.vy16 = -96
if err := g.jumpPlayer.Rewind(); err != nil {
return err
}
g.jumpPlayer.Play()
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}
g.y16 += g.vy16
// Gravity
g.vy16 += 4
if g.vy16 > 96 {
g.vy16 = 96
}
if g.hit() {
if err := g.hitPlayer.Rewind(); err != nil {
return err
}
g.hitPlayer.Play()
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g.mode = ModeGameOver
g.gameoverCount = 30
}
case ModeGameOver:
if g.gameoverCount > 0 {
g.gameoverCount--
}
if g.gameoverCount == 0 && g.isKeyJustPressed() {
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g.init()
g.mode = ModeTitle
}
}
return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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screen.Fill(color.RGBA{0x80, 0xa0, 0xc0, 0xff})
g.drawTiles(screen)
if g.mode != ModeTitle {
g.drawGopher(screen)
}
var titleTexts string
var texts string
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switch g.mode {
case ModeTitle:
titleTexts = "FLAPPY GOPHER"
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texts = "\n\n\n\n\n\nPRESS SPACE KEY\n\nOR A/B BUTTON\n\nOR TOUCH SCREEN"
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case ModeGameOver:
texts = "\nGAME OVER!"
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}
op := &text.DrawOptions{}
op.GeoM.Translate(screenWidth/2, 3*titleFontSize)
op.ColorScale.ScaleWithColor(color.White)
op.LineSpacingInPixels = titleFontSize
op.PrimaryAlign = text.AlignCenter
text.Draw(screen, titleTexts, &text.GoTextFace{
Source: arcadeFaceSource,
Size: titleFontSize,
}, op)
op = &text.DrawOptions{}
op.GeoM.Translate(screenWidth/2, 3*titleFontSize)
op.ColorScale.ScaleWithColor(color.White)
op.LineSpacingInPixels = fontSize
op.PrimaryAlign = text.AlignCenter
text.Draw(screen, texts, &text.GoTextFace{
Source: arcadeFaceSource,
Size: fontSize,
}, op)
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if g.mode == ModeTitle {
const msg = "Go Gopher by Renee French is\nlicenced under CC BY 3.0."
op := &text.DrawOptions{}
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op.GeoM.Translate(screenWidth/2, screenHeight-smallFontSize/2)
op.ColorScale.ScaleWithColor(color.White)
op.LineSpacingInPixels = smallFontSize
op.PrimaryAlign = text.AlignCenter
op.SecondaryAlign = text.AlignEnd
text.Draw(screen, msg, &text.GoTextFace{
Source: arcadeFaceSource,
Size: smallFontSize,
}, op)
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}
op = &text.DrawOptions{}
op.GeoM.Translate(screenWidth, 0)
op.ColorScale.ScaleWithColor(color.White)
op.LineSpacingInPixels = fontSize
op.PrimaryAlign = text.AlignEnd
text.Draw(screen, fmt.Sprintf("%04d", g.score()), &text.GoTextFace{
Source: arcadeFaceSource,
Size: fontSize,
}, op)
ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.ActualTPS()))
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}
func (g *Game) pipeAt(tileX int) (tileY int, ok bool) {
if (tileX - pipeStartOffsetX) <= 0 {
return 0, false
}
if floorMod(tileX-pipeStartOffsetX, pipeIntervalX) != 0 {
return 0, false
}
idx := floorDiv(tileX-pipeStartOffsetX, pipeIntervalX)
return g.pipeTileYs[idx%len(g.pipeTileYs)], true
}
func (g *Game) score() int {
x := floorDiv(g.x16, 16) / tileSize
if (x - pipeStartOffsetX) <= 0 {
return 0
}
return floorDiv(x-pipeStartOffsetX, pipeIntervalX)
}
func (g *Game) hit() bool {
if g.mode != ModeGame {
return false
}
const (
gopherWidth = 30
gopherHeight = 60
)
w, h := gopherImage.Bounds().Dx(), gopherImage.Bounds().Dy()
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x0 := floorDiv(g.x16, 16) + (w-gopherWidth)/2
y0 := floorDiv(g.y16, 16) + (h-gopherHeight)/2
x1 := x0 + gopherWidth
y1 := y0 + gopherHeight
if y0 < -tileSize*4 {
return true
}
if y1 >= screenHeight-tileSize {
return true
}
xMin := floorDiv(x0-pipeWidth, tileSize)
xMax := floorDiv(x0+gopherWidth, tileSize)
for x := xMin; x <= xMax; x++ {
y, ok := g.pipeAt(x)
if !ok {
continue
}
if x0 >= x*tileSize+pipeWidth {
continue
}
if x1 < x*tileSize {
continue
}
if y0 < y*tileSize {
return true
}
if y1 >= (y+pipeGapY)*tileSize {
return true
}
}
return false
}
func (g *Game) drawTiles(screen *ebiten.Image) {
const (
nx = screenWidth / tileSize
ny = screenHeight / tileSize
pipeTileSrcX = 128
pipeTileSrcY = 192
)
op := &ebiten.DrawImageOptions{}
for i := -2; i < nx+1; i++ {
// ground
op.GeoM.Reset()
op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
float64((ny-1)*tileSize-floorMod(g.cameraY, tileSize)))
screen.DrawImage(tilesImage.SubImage(image.Rect(0, 0, tileSize, tileSize)).(*ebiten.Image), op)
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// pipe
if tileY, ok := g.pipeAt(floorDiv(g.cameraX, tileSize) + i); ok {
for j := 0; j < tileY; j++ {
op.GeoM.Reset()
op.GeoM.Scale(1, -1)
op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
float64(j*tileSize-floorMod(g.cameraY, tileSize)))
op.GeoM.Translate(0, tileSize)
var r image.Rectangle
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if j == tileY-1 {
r = image.Rect(pipeTileSrcX, pipeTileSrcY, pipeTileSrcX+tileSize*2, pipeTileSrcY+tileSize)
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} else {
r = image.Rect(pipeTileSrcX, pipeTileSrcY+tileSize, pipeTileSrcX+tileSize*2, pipeTileSrcY+tileSize*2)
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}
screen.DrawImage(tilesImage.SubImage(r).(*ebiten.Image), op)
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}
for j := tileY + pipeGapY; j < screenHeight/tileSize-1; j++ {
op.GeoM.Reset()
op.GeoM.Translate(float64(i*tileSize-floorMod(g.cameraX, tileSize)),
float64(j*tileSize-floorMod(g.cameraY, tileSize)))
var r image.Rectangle
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if j == tileY+pipeGapY {
r = image.Rect(pipeTileSrcX, pipeTileSrcY, pipeTileSrcX+pipeWidth, pipeTileSrcY+tileSize)
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} else {
r = image.Rect(pipeTileSrcX, pipeTileSrcY+tileSize, pipeTileSrcX+pipeWidth, pipeTileSrcY+tileSize+tileSize)
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}
screen.DrawImage(tilesImage.SubImage(r).(*ebiten.Image), op)
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}
}
}
}
func (g *Game) drawGopher(screen *ebiten.Image) {
op := &ebiten.DrawImageOptions{}
w, h := gopherImage.Bounds().Dx(), gopherImage.Bounds().Dy()
op.GeoM.Translate(-float64(w)/2.0, -float64(h)/2.0)
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op.GeoM.Rotate(float64(g.vy16) / 96.0 * math.Pi / 6)
op.GeoM.Translate(float64(w)/2.0, float64(h)/2.0)
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op.GeoM.Translate(float64(g.x16/16.0)-float64(g.cameraX), float64(g.y16/16.0)-float64(g.cameraY))
op.Filter = ebiten.FilterLinear
screen.DrawImage(gopherImage, op)
}
type GameWithCRTEffect struct {
ebiten.Game
crtShader *ebiten.Shader
}
func (g *GameWithCRTEffect) DrawFinalScreen(screen ebiten.FinalScreen, offscreen *ebiten.Image, geoM ebiten.GeoM) {
if g.crtShader == nil {
s, err := ebiten.NewShader(crtGo)
if err != nil {
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panic(fmt.Sprintf("flappy: failed to compiled the CRT shader: %v", err))
}
g.crtShader = s
}
os := offscreen.Bounds().Size()
op := &ebiten.DrawRectShaderOptions{}
op.Images[0] = offscreen
op.GeoM = geoM
screen.DrawRectShader(os.X, os.Y, g.crtShader, op)
}
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func main() {
flag.Parse()
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Flappy Gopher (Ebitengine Demo)")
if err := ebiten.RunGame(NewGame(*flagCRT)); err != nil {
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panic(err)
}
}