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package main
import (
"log"
"image"
"image/color"
_ "embed"
_ "image/png"
"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
const (
screenWidth = 400
screenHeight = 240
tileSize = 16
playerSpeed = 0.2
jumpHeight = 0.2
rewindSpeed = 2
)
var (
//go:embed shaders/none.kage
noneShader_src []byte
//go:embed shaders/vcr.kage
vcrShader_src []byte
//go:embed shaders/reverse.kage
rewindShader_src []byte
)
var (
shaders map[string]*ebiten.Shader
)
type State int
const (
IN_GAME State = iota
END
REVERSING
)
type RecPoint struct {
x float32
y float32
vx float32
vy float32
}
type Game struct {
surface *ebiten.Image
tilemap *Tilemap
offsetX int
offsetY int
player *GameObject
startPosition *GameObject
exit *GameObject
objects []*GameObject
time int
shaderName string
recording [][]RecPoint
state State
}
func (g * Game)RecordPoint() {
points := []RecPoint{}
for _, object := range g.objects {
points = append(points, RecPoint{
x: object.x,
y: object.y,
vx: object.vx,
vy: object.vy,
})
}
g.recording = append(g.recording, points)
}
func (g * Game)ReplayPoint() {
if len(g.recording) == 0 {
return
}
var points []RecPoint
points, g.recording = g.recording[len(g.recording)-1], g.recording[:len(g.recording)-1]
for i, point := range points {
g.objects[i].x = point.x
g.objects[i].y = point.y
g.objects[i].vx = point.vx
g.objects[i].vy = point.vy
}
}
func (g * Game)InitPlayer() {
g.player = &GameObject{}
playerImage, _, err := ebitenutil.NewImageFromFile("Assets/Main Characters/Ninja Frog/Idle (32x32).png")
if err != nil {
log.Fatal(err)
}
g.player.image = playerImage.SubImage(image.Rect(0, 0, 32, 32)).(*ebiten.Image)
g.objects = append(g.objects, g.player)
g.ResetPlayer()
}
func (g * Game)ResetPlayer() {
g.player.x = g.startPosition.x
g.player.y = g.startPosition.y - 0.1
}
func (g * Game)InitExit() {
g.exit = &GameObject{
x: 21,
y: 8,
}
exitImage, _, err := ebitenutil.NewImageFromFile("tiles.png")
if err != nil {
log.Fatal(err)
}
g.exit.image = exitImage.SubImage(image.Rect(0, 16, 32, 48)).(*ebiten.Image)
g.objects = append(g.objects, g.exit)
}
func (g *Game) Init() {
g.state = IN_GAME
g.surface = ebiten.NewImage(screenWidth, screenHeight)
g.shaderName = "none"
tilemap := NewTilemap([][]int{
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 0,
0, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 0,
0, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
},
}, 25)
g.startPosition = &GameObject{
x: 4,
y: 8,
}
g.tilemap = &tilemap
g.tilemap.UpdateSurface()
g.InitPlayer()
g.InitExit()
ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Reverse")
if err := ebiten.RunGame(g); err != nil {
log.Fatal(err)
}
}
func (g *Game) Update() error {
g.time += 1
if inpututil.IsKeyJustPressed(ebiten.KeyR) {
if g.state == REVERSING {
g.state = IN_GAME
g.shaderName = "none"
} else {
g.state = REVERSING
g.shaderName = "vcr"
}
}
if ebiten.IsKeyPressed(ebiten.KeyLeft) || ebiten.IsKeyPressed(ebiten.KeyA) {
g.player.vx = -playerSpeed
}
if ebiten.IsKeyPressed(ebiten.KeyRight) || ebiten.IsKeyPressed(ebiten.KeyD) {
g.player.vx = playerSpeed
}
if g.player.onGround && (ebiten.IsKeyPressed(ebiten.KeySpace) || ebiten.IsKeyPressed(ebiten.KeyUp)) {
g.player.vy = -jumpHeight
}
if g.state == IN_GAME {
for _, obj := range g.objects {
obj.Update(*g.tilemap)
}
g.tilemap.Update()
g.RecordPoint()
}
if g.state == REVERSING {
for x := 0; x < rewindSpeed; x++ {
g.ReplayPoint()
}
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
g.surface.Fill(color.Alpha16{0x9ccf})
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(g.offsetX), float64(g.offsetY))
g.surface.DrawImage(g.tilemap.surface, op)
for i := len(g.objects)-1; i >= 0; i-- {
obj := g.objects[i]
obj.Draw(g.surface, *g.tilemap)
}
cx, cy := ebiten.CursorPosition()
shop := &ebiten.DrawRectShaderOptions{}
shop.Uniforms = map[string]any{
"Time": float32(g.time) / 60,
"Cursor": []float32{float32(cx), float32(cy)},
}
shop.Images[0] = g.surface
shop.Images[1] = g.surface
shop.Images[2] = g.surface
shop.Images[3] = g.surface
screen.DrawRectShader(screenWidth, screenHeight, shaders[g.shaderName], shop)
//screen.DrawImage(surface, &ebiten.DrawImageOptions{})
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int){
return screenWidth, screenHeight
}
func LoadShaders() error {
if shaders == nil {
shaders = map[string]*ebiten.Shader{}
}
var err error
shaders["none"], err = ebiten.NewShader([]byte(noneShader_src))
if err != nil {
return err
}
shaders["vcr"], err = ebiten.NewShader([]byte(vcrShader_src))
if err != nil {
return err
}
return nil
}
func main() {
LoadShaders()
ebiten.SetWindowTitle("Hello, World!")
game := &Game{}
game.Init()
if err := ebiten.RunGame(game); err != nil {
log.Fatal(err)
}
}
|
