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package main
import (
"bytes"
"flag"
"image"
"image/color"
"image/draw"
"image/png"
"math"
"time"
"github.com/faiface/pixel"
"github.com/faiface/pixel/pixelgl"
)
const texSize = 64
var (
fullscreen = false
showMap = true
width = 320
height = 200
scale = 3.0
wallDistance = 8.0
as actionSquare
pos, dir, plane pixel.Vec
textures = loadTextures()
)
func setup() {
pos = pixel.V(12.0, 14.5)
dir = pixel.V(-1.0, 0.0)
plane = pixel.V(0.0, 0.66)
}
var world = [24][24]int{
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 3, 0, 3, 0, 3, 0, 0, 0, 1},
{1, 0, 0, 0, 2, 7, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 3, 0, 7, 0, 3, 0, 0, 0, 1},
{1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 2, 2, 2, 2, 0, 2, 2, 0, 0, 0, 0, 3, 0, 3, 0, 3, 0, 0, 0, 1},
{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 0, 6, 0, 4, 0, 0, 0, 4, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 5, 0, 0, 0, 1},
{1, 0, 6, 0, 4, 0, 7, 0, 4, 0, 0, 0, 0, 0, 5, 0, 0, 0, 5, 0, 0, 0, 0, 1},
{1, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0, 0, 5, 5, 5, 5, 5, 5, 5, 0, 0, 0, 1},
{1, 4, 4, 4, 4, 4, 4, 0, 4, 0, 0, 0, 5, 5, 0, 5, 5, 5, 0, 5, 5, 0, 0, 1},
{1, 4, 0, 0, 0, 0, 0, 0, 4, 0, 0, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 0, 1},
{1, 4, 0, 4, 0, 0, 0, 0, 4, 0, 0, 5, 0, 5, 5, 5, 5, 5, 5, 5, 0, 5, 0, 1},
{1, 4, 0, 4, 4, 4, 4, 4, 4, 0, 0, 5, 0, 5, 0, 0, 0, 0, 0, 5, 0, 5, 0, 1},
{1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 5, 0, 5, 5, 0, 0, 0, 0, 1},
{1, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
}
func loadTextures() *image.RGBA {
p, err := png.Decode(bytes.NewReader(textureData))
if err != nil {
panic(err)
}
m := image.NewRGBA(p.Bounds())
draw.Draw(m, m.Bounds(), p, image.ZP, draw.Src)
return m
}
func getTexNum(x, y int) int {
return world[x][y]
}
func getColor(x, y int) color.RGBA {
switch world[x][y] {
case 0:
return color.RGBA{43, 30, 24, 255}
case 1:
return color.RGBA{100, 89, 73, 255}
case 2:
return color.RGBA{110, 23, 0, 255}
case 3:
return color.RGBA{45, 103, 171, 255}
case 4:
return color.RGBA{123, 84, 33, 255}
case 5:
return color.RGBA{158, 148, 130, 255}
case 6:
return color.RGBA{203, 161, 47, 255}
case 7:
return color.RGBA{255, 107, 0, 255}
case 9:
return color.RGBA{0, 0, 0, 0}
default:
return color.RGBA{255, 194, 32, 255}
}
}
func frame() *image.RGBA {
m := image.NewRGBA(image.Rect(0, 0, width, height))
for x := 0; x < width; x++ {
var (
step image.Point
sideDist pixel.Vec
perpWallDist float64
hit, side bool
rayPos, worldX, worldY = pos, int(pos.X), int(pos.Y)
cameraX = 2*float64(x)/float64(width) - 1
rayDir = pixel.V(
dir.X+plane.X*cameraX,
dir.Y+plane.Y*cameraX,
)
deltaDist = pixel.V(
math.Sqrt(1.0+(rayDir.Y*rayDir.Y)/(rayDir.X*rayDir.X)),
math.Sqrt(1.0+(rayDir.X*rayDir.X)/(rayDir.Y*rayDir.Y)),
)
)
if rayDir.X < 0 {
step.X = -1
sideDist.X = (rayPos.X - float64(worldX)) * deltaDist.X
} else {
step.X = 1
sideDist.X = (float64(worldX) + 1.0 - rayPos.X) * deltaDist.X
}
if rayDir.Y < 0 {
step.Y = -1
sideDist.Y = (rayPos.Y - float64(worldY)) * deltaDist.Y
} else {
step.Y = 1
sideDist.Y = (float64(worldY) + 1.0 - rayPos.Y) * deltaDist.Y
}
for !hit {
if sideDist.X < sideDist.Y {
sideDist.X += deltaDist.X
worldX += step.X
side = false
} else {
sideDist.Y += deltaDist.Y
worldY += step.Y
side = true
}
if world[worldX][worldY] > 0 {
hit = true
}
}
var wallX float64
if side {
perpWallDist = (float64(worldY) - rayPos.Y + (1-float64(step.Y))/2) / rayDir.Y
wallX = rayPos.X + perpWallDist*rayDir.X
} else {
perpWallDist = (float64(worldX) - rayPos.X + (1-float64(step.X))/2) / rayDir.X
wallX = rayPos.Y + perpWallDist*rayDir.Y
}
if x == width/2 {
wallDistance = perpWallDist
}
wallX -= math.Floor(wallX)
texX := int(wallX * float64(texSize))
lineHeight := int(float64(height) / perpWallDist)
if lineHeight < 1 {
lineHeight = 1
}
drawStart := -lineHeight/2 + height/2
if drawStart < 0 {
drawStart = 0
}
drawEnd := lineHeight/2 + height/2
if drawEnd >= height {
drawEnd = height - 1
}
if !side && rayDir.X > 0 {
texX = texSize - texX - 1
}
if side && rayDir.Y < 0 {
texX = texSize - texX - 1
}
texNum := getTexNum(worldX, worldY)
for y := drawStart; y < drawEnd+1; y++ {
d := y*256 - height*128 + lineHeight*128
texY := ((d * texSize) / lineHeight) / 256
c := textures.RGBAAt(
texX+texSize*(texNum),
texY%texSize,
)
if side {
c.R = c.R / 2
c.G = c.G / 2
c.B = c.B / 2
}
m.Set(x, y, c)
}
var floorWall pixel.Vec
if !side && rayDir.X > 0 {
floorWall.X = float64(worldX)
floorWall.Y = float64(worldY) + wallX
} else if !side && rayDir.X < 0 {
floorWall.X = float64(worldX) + 1.0
floorWall.Y = float64(worldY) + wallX
} else if side && rayDir.Y > 0 {
floorWall.X = float64(worldX) + wallX
floorWall.Y = float64(worldY)
} else {
floorWall.X = float64(worldX) + wallX
floorWall.Y = float64(worldY) + 1.0
}
distWall, distPlayer := perpWallDist, 0.0
for y := drawEnd + 1; y < height; y++ {
currentDist := float64(height) / (2.0*float64(y) - float64(height))
weight := (currentDist - distPlayer) / (distWall - distPlayer)
currentFloor := pixel.V(
weight*floorWall.X+(1.0-weight)*pos.X,
weight*floorWall.Y+(1.0-weight)*pos.Y,
)
fx := int(currentFloor.X*float64(texSize)) % texSize
fy := int(currentFloor.Y*float64(texSize)) % texSize
m.Set(x, y, textures.At(fx, fy))
m.Set(x, height-y-1, textures.At(fx+(4*texSize), fy))
m.Set(x, height-y, textures.At(fx+(4*texSize), fy))
}
}
return m
}
func minimap() *image.RGBA {
m := image.NewRGBA(image.Rect(0, 0, 24, 26))
for x, row := range world {
for y, _ := range row {
c := getColor(x, y)
if c.A == 255 {
c.A = 96
}
m.Set(x, y, c)
}
}
m.Set(int(pos.X), int(pos.Y), color.RGBA{255, 0, 0, 255})
if as.active {
m.Set(as.X, as.Y, color.RGBA{255, 255, 255, 255})
} else {
m.Set(as.X, as.Y, color.RGBA{64, 64, 64, 255})
}
return m
}
func getActionSquare() actionSquare {
pt := image.Pt(int(pos.X)+1, int(pos.Y))
a := dir.Angle()
switch {
case a > 2.8 || a < -2.8:
pt = image.Pt(int(pos.X)-1, int(pos.Y))
case a > -2.8 && a < -2.2:
pt = image.Pt(int(pos.X)-1, int(pos.Y)-1)
case a > -2.2 && a < -1.4:
pt = image.Pt(int(pos.X), int(pos.Y)-1)
case a > -1.4 && a < -0.7:
pt = image.Pt(int(pos.X)+1, int(pos.Y)-1)
case a > 0.4 && a < 1.0:
pt = image.Pt(int(pos.X)+1, int(pos.Y)+1)
case a > 1.0 && a < 1.7:
pt = image.Pt(int(pos.X), int(pos.Y)+1)
case a > 1.7:
pt = image.Pt(int(pos.X)-1, int(pos.Y)+1)
}
block := -1
active := pt.X > 0 && pt.X < 23 && pt.Y > 0 && pt.Y < 23
if active {
block = world[pt.X][pt.Y]
}
return actionSquare{
X: pt.X,
Y: pt.Y,
active: active,
block: block,
}
}
type actionSquare struct {
X int
Y int
block int
active bool
}
func (as actionSquare) toggle(n int) {
if as.active {
if world[as.X][as.Y] == 0 {
world[as.X][as.Y] = n
} else {
world[as.X][as.Y] = 0
}
}
}
func (as actionSquare) set(n int) {
if as.active {
world[as.X][as.Y] = n
}
}
func run() {
cfg := pixelgl.WindowConfig{
Bounds: pixel.R(0, 0, float64(width)*scale, float64(height)*scale),
VSync: true,
Undecorated: true,
}
if fullscreen {
cfg.Monitor = pixelgl.PrimaryMonitor()
}
win, err := pixelgl.NewWindow(cfg)
if err != nil {
panic(err)
}
c := win.Bounds().Center()
last := time.Now()
mapRot := -1.6683362599999894
for !win.Closed() {
if win.JustPressed(pixelgl.KeyEscape) || win.JustPressed(pixelgl.KeyQ) {
return
}
win.Clear(color.Black)
dt := time.Since(last).Seconds()
last = time.Now()
as = getActionSquare()
if win.Pressed(pixelgl.KeyUp) || win.Pressed(pixelgl.KeyW) {
moveForward(3.5 * dt)
}
if win.Pressed(pixelgl.KeyA) {
moveLeft(3.5 * dt)
}
if win.Pressed(pixelgl.KeyDown) || win.Pressed(pixelgl.KeyS) {
moveBackwards(3.5 * dt)
}
if win.Pressed(pixelgl.KeyD) {
moveRight(3.5 * dt)
}
if win.Pressed(pixelgl.KeyRight) {
turnRight(1.2 * dt)
}
if win.Pressed(pixelgl.KeyLeft) {
turnLeft(1.2 * dt)
}
if win.JustPressed(pixelgl.KeyM) {
showMap = !showMap
}
if win.JustPressed(pixelgl.Key1) {
as.set(1)
}
if win.JustPressed(pixelgl.Key2) {
as.set(2)
}
if win.JustPressed(pixelgl.Key3) {
as.set(3)
}
if win.JustPressed(pixelgl.Key4) {
as.set(4)
}
if win.JustPressed(pixelgl.Key5) {
as.set(5)
}
if win.JustPressed(pixelgl.Key6) {
as.set(6)
}
if win.JustPressed(pixelgl.Key7) {
as.set(7)
}
if win.JustPressed(pixelgl.Key0) {
as.set(0)
}
if win.JustPressed(pixelgl.KeySpace) {
as.toggle(3)
}
p := pixel.PictureDataFromImage(frame())
pixel.NewSprite(p, p.Bounds()).
Draw(win, pixel.IM.Moved(c).Scaled(c, scale))
if showMap {
m := pixel.PictureDataFromImage(minimap())
mc := m.Bounds().Min.Add(pixel.V(-m.Rect.W(), m.Rect.H()))
pixel.NewSprite(m, m.Bounds()).
Draw(win, pixel.IM.
Moved(mc).
Rotated(mc, mapRot).
ScaledXY(pixel.ZV, pixel.V(-scale*2, scale*2)))
}
win.Update()
}
}
func moveForward(s float64) {
if wallDistance > 0.3 {
if world[int(pos.X+dir.X*s)][int(pos.Y)] == 0 {
pos.X += dir.X * s
}
if world[int(pos.X)][int(pos.Y+dir.Y*s)] == 0 {
pos.Y += dir.Y * s
}
}
}
func moveLeft(s float64) {
if world[int(pos.X-plane.X*s)][int(pos.Y)] == 0 {
pos.X -= plane.X * s
}
if world[int(pos.X)][int(pos.Y-plane.Y*s)] == 0 {
pos.Y -= plane.Y * s
}
}
func moveBackwards(s float64) {
if world[int(pos.X-dir.X*s)][int(pos.Y)] == 0 {
pos.X -= dir.X * s
}
if world[int(pos.X)][int(pos.Y-dir.Y*s)] == 0 {
pos.Y -= dir.Y * s
}
}
func moveRight(s float64) {
if world[int(pos.X+plane.X*s)][int(pos.Y)] == 0 {
pos.X += plane.X * s
}
if world[int(pos.X)][int(pos.Y+plane.Y*s)] == 0 {
pos.Y += plane.Y * s
}
}
func turnRight(s float64) {
oldDirX := dir.X
dir.X = dir.X*math.Cos(-s) - dir.Y*math.Sin(-s)
dir.Y = oldDirX*math.Sin(-s) + dir.Y*math.Cos(-s)
oldPlaneX := plane.X
plane.X = plane.X*math.Cos(-s) - plane.Y*math.Sin(-s)
plane.Y = oldPlaneX*math.Sin(-s) + plane.Y*math.Cos(-s)
}
func turnLeft(s float64) {
oldDirX := dir.X
dir.X = dir.X*math.Cos(s) - dir.Y*math.Sin(s)
dir.Y = oldDirX*math.Sin(s) + dir.Y*math.Cos(s)
oldPlaneX := plane.X
plane.X = plane.X*math.Cos(s) - plane.Y*math.Sin(s)
plane.Y = oldPlaneX*math.Sin(s) + plane.Y*math.Cos(s)
}
func main() {
flag.BoolVar(&fullscreen, "f", fullscreen, "fullscreen")
flag.IntVar(&width, "w", width, "width")
flag.IntVar(&height, "h", height, "height")
flag.Float64Var(&scale, "s", scale, "scale")
flag.Parse()
setup()
pixelgl.Run(run)
}
var textureData = []byte{137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 2, 0, 0, 0, 0, 64, 8, 3, 0, 0, 0, 91, 97, 63, 141, 0, 0, 2, 100, 80, 76, 84, 69, 182, 182, 182, 48, 38, 29, 33, 23, 15, 191, 146, 37, 7, 3, 1, 72, 64, 49, 40, 28, 20, 37, 26, 19, 42, 31, 22, 110, 100, 84, 64, 54, 40, 55, 46, 32, 142, 131, 114, 74, 40, 10, 22, 14, 7, 97, 86, 69, 66, 35, 6, 99, 60, 20, 102, 91, 75, 16, 9, 3, 120, 27, 1, 27, 18, 11, 184, 140, 33, 83, 72, 57, 131, 119, 103, 114, 73, 27, 128, 87, 34, 48, 23, 2, 159, 149, 134, 185, 185, 185, 6, 37, 82, 68, 59, 45, 130, 188, 209, 111, 72, 8, 129, 32, 4, 134, 93, 38, 150, 139, 123, 46, 33, 27, 80, 68, 54, 199, 156, 43, 87, 75, 61, 43, 43, 43, 123, 111, 95, 60, 50, 38, 92, 55, 17, 119, 79, 31, 170, 159, 142, 82, 46, 14, 170, 125, 23, 146, 135, 118, 164, 119, 20, 189, 189, 189, 31, 80, 138, 115, 104, 89, 203, 162, 47, 1, 0, 0, 127, 115, 99, 87, 49, 15, 193, 193, 193, 1, 27, 64, 40, 96, 165, 83, 83, 83, 54, 42, 36, 42, 100, 171, 154, 143, 128, 118, 108, 92, 57, 57, 56, 109, 69, 25, 137, 127, 108, 206, 167, 50, 89, 80, 63, 224, 211, 196, 0, 9, 27, 255, 255, 255, 79, 44, 1, 3, 31, 71, 92, 82, 66, 71, 71, 71, 22, 61, 110, 19, 54, 100, 198, 198, 198, 189, 176, 161, 1, 22, 57, 117, 78, 9, 93, 19, 0, 29, 76, 132, 99, 22, 1, 111, 26, 2, 35, 87, 150, 27, 71, 126, 78, 69, 57, 127, 127, 127, 160, 114, 18, 0, 5, 16, 1, 18, 49, 0, 12, 38, 134, 124, 105, 178, 133, 28, 34, 33, 33, 105, 25, 2, 139, 123, 109, 135, 38, 7, 27, 67, 116, 105, 66, 24, 37, 91, 157, 72, 58, 46, 174, 129, 26, 59, 30, 5, 33, 83, 144, 132, 125, 112, 124, 83, 32, 148, 130, 114, 45, 104, 178, 78, 62, 51, 195, 152, 40, 23, 54, 90, 153, 137, 123, 81, 20, 2, 38, 15, 1, 184, 173, 157, 175, 163, 148, 9, 44, 95, 172, 119, 47, 28, 63, 102, 210, 171, 54, 95, 56, 3, 94, 84, 72, 83, 73, 66, 207, 195, 180, 201, 189, 173, 179, 168, 152, 28, 10, 0, 155, 155, 155, 97, 87, 80, 139, 100, 42, 152, 55, 18, 144, 46, 11, 164, 155, 138, 123, 123, 123, 55, 27, 4, 203, 203, 203, 214, 203, 187, 87, 86, 86, 164, 112, 46, 155, 103, 39, 50, 116, 197, 106, 106, 106, 57, 133, 225, 44, 107, 183, 52, 121, 205, 86, 49, 3, 54, 126, 214, 147, 103, 16, 147, 95, 36, 68, 16, 1, 140, 98, 16, 153, 109, 18, 145, 102, 45, 169, 150, 136, 194, 181, 166, 48, 112, 190, 169, 73, 36, 84, 7, 0, 19, 47, 78, 169, 120, 61, 114, 114, 114, 131, 91, 14, 123, 84, 13, 169, 170, 170, 64, 63, 62, 137, 137, 137, 100, 64, 7, 56, 11, 0, 100, 100, 100, 209, 209, 209, 178, 130, 76, 50, 50, 50, 43, 87, 171, 95, 95, 95, 9, 51, 110, 87, 79, 70, 110, 159, 225, 105, 146, 167, 15, 39, 62, 13, 31, 46, 174, 175, 175, 213, 144, 111, 95, 143, 212, 189, 90, 48, 164, 164, 163, 66, 148, 245, 70, 114, 191, 116, 160, 179, 141, 143, 144, 220, 155, 122, 222, 224, 225, 154, 198, 214, 60, 139, 234, 125, 53, 24, 237, 242, 244, 140, 175, 189, 188, 217, 227, 191, 150, 127, 218, 172, 148, 46, 0, 54, 145, 0, 0, 51, 110, 73, 68, 65, 84, 120, 218, 164, 89, 251, 83, 27, 85, 20, 206, 46, 44, 201, 238, 38, 89, 8, 132, 141, 36, 146, 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216, 123, 46, 168, 227, 224, 64, 44, 78, 119, 46, 142, 25, 129, 176, 45, 16, 216, 87, 17, 176, 25, 89, 110, 179, 221, 205, 205, 250, 137, 152, 97, 51, 224, 5, 254, 1, 194, 226, 42, 25, 18, 150, 206, 206, 43, 67, 190, 18, 57, 239, 247, 179, 15, 228, 180, 171, 235, 225, 200, 243, 91, 12, 134, 56, 21, 247, 36, 156, 179, 24, 0, 26, 38, 36, 196, 203, 151, 137, 10, 20, 186, 67, 238, 21, 54, 4, 148, 214, 143, 95, 174, 189, 35, 235, 65, 45, 39, 102, 144, 161, 219, 121, 125, 244, 123, 206, 119, 241, 249, 115, 84, 157, 240, 53, 143, 208, 243, 225, 253, 62, 117, 6, 216, 213, 124, 98, 8, 46, 114, 133, 174, 195, 120, 19, 239, 57, 99, 126, 30, 142, 188, 63, 89, 173, 206, 120, 221, 213, 238, 234, 100, 94, 188, 0, 243, 9, 149, 130, 252, 120, 1, 46, 171, 77, 181, 209, 121, 14, 240, 233, 159, 108, 244, 127, 50, 21, 97, 159, 183, 179, 147, 79, 255, 166, 106, 216, 255, 189, 210, 234, 12, 49, 40, 76, 213, 16, 84, 108, 106, 44, 50, 134, 250, 207, 145, 155, 138, 68, 58, 167, 169, 55, 117, 206, 83, 132, 119, 112, 229, 44, 90, 58, 182, 164, 123, 229, 209, 76, 70, 44, 224, 158, 153, 11, 109, 199, 248, 34, 48, 251, 18, 56, 164, 12, 224, 99, 129, 24, 128, 165, 255, 91, 23, 190, 61, 214, 246, 235, 12, 57, 244, 47, 199, 193, 182, 88, 34, 204, 159, 51, 78, 175, 229, 128, 181, 72, 243, 112, 156, 241, 220, 22, 219, 39, 220, 208, 60, 102, 139, 33, 119, 90, 60, 22, 43, 240, 15, 128, 246, 65, 41, 126, 209, 73, 216, 24, 130, 43, 103, 250, 54, 182, 1, 253, 12, 9, 130, 252, 22, 94, 62, 25, 8, 120, 139, 156, 195, 151, 229, 30, 200, 27, 116, 112, 146, 151, 95, 9, 221, 161, 167, 179, 16, 160, 72, 248, 241, 178, 59, 199, 95, 177, 228, 239, 190, 219, 166, 219, 121, 7, 186, 228, 114, 175, 90, 230, 9, 186, 228, 71, 21, 240, 16, 222, 133, 28, 136, 92, 113, 41, 33, 111, 54, 128, 36, 171, 121, 147, 51, 152, 211, 155, 147, 73, 229, 33, 128, 128, 60, 59, 1, 217, 44, 117, 134, 115, 218, 216, 90, 85, 212, 168, 115, 18, 40, 72, 146, 41, 117, 224, 67, 22, 141, 79, 227, 249, 164, 238, 180, 216, 198, 115, 231, 68, 38, 143, 200, 21, 6, 12, 228, 87, 198, 58, 35, 145, 42, 163, 168, 15, 53, 226, 247, 127, 169, 175, 15, 117, 174, 172, 44, 173, 226, 10, 188, 47, 13, 175, 135, 167, 225, 34, 39, 173, 87, 60, 189, 68, 125, 166, 2, 22, 143, 102, 80, 99, 20, 19, 48, 141, 32, 122, 233, 214, 182, 5, 76, 177, 237, 247, 146, 224, 143, 223, 126, 59, 119, 200, 60, 4, 186, 117, 41, 154, 57, 133, 242, 193, 133, 40, 13, 219, 184, 18, 22, 11, 87, 26, 177, 112, 208, 136, 199, 226, 232, 202, 91, 18, 11, 215, 197, 133, 39, 98, 113, 186, 233, 189, 37, 78, 75, 254, 55, 92, 237, 3, 16, 186, 65, 223, 242, 119, 168, 148, 178, 93, 185, 78, 201, 113, 35, 4, 255, 17, 229, 29, 193, 112, 172, 248, 172, 7, 240, 29, 1, 193, 128, 60, 231, 111, 176, 121, 80, 87, 215, 81, 201, 237, 63, 207, 249, 114, 66, 207, 157, 71, 152, 149, 159, 45, 182, 5, 1, 71, 75, 206, 167, 39, 124, 61, 35, 236, 241, 158, 97, 217, 215, 211, 211, 35, 1, 100, 94, 20, 126, 114, 98, 243, 105, 10, 100, 193, 223, 160, 56, 242, 134, 172, 124, 136, 250, 34, 63, 233, 75, 37, 103, 209, 43, 202, 172, 78, 166, 158, 225, 74, 184, 21, 34, 112, 7, 112, 53, 252, 205, 156, 54, 88, 248, 179, 193, 58, 78, 185, 234, 120, 4, 129, 250, 223, 226, 40, 148, 253, 111, 58, 20, 93, 66, 197, 10, 0, 42, 68, 4, 96, 0, 212, 160, 87, 84, 164, 87, 81, 251, 70, 183, 107, 101, 37, 189, 178, 190, 177, 225, 90, 217, 230, 105, 139, 147, 105, 79, 167, 87, 211, 235, 27, 235, 237, 105, 204, 33, 13, 95, 5, 43, 235, 235, 237, 153, 99, 232, 81, 155, 0, 152, 57, 165, 108, 64, 92, 70, 31, 250, 195, 50, 128, 67, 240, 123, 110, 125, 21, 109, 179, 180, 47, 184, 206, 12, 114, 159, 97, 224, 113, 49, 94, 25, 79, 132, 19, 113, 195, 184, 55, 96, 196, 225, 137, 186, 120, 194, 8, 194, 43, 108, 166, 188, 78, 228, 134, 200, 225, 134, 211, 172, 79, 132, 12, 229, 31, 160, 234, 237, 166, 150, 113, 181, 170, 55, 163, 1, 82, 70, 186, 51, 215, 169, 202, 77, 141, 117, 142, 77, 143, 51, 108, 146, 180, 212, 114, 76, 82, 195, 65, 9, 140, 192, 90, 128, 155, 245, 60, 248, 150, 86, 194, 3, 80, 137, 193, 85, 106, 146, 163, 100, 154, 242, 218, 163, 205, 39, 27, 150, 101, 230, 191, 54, 49, 196, 22, 0, 75, 129, 147, 47, 64, 101, 37, 48, 49, 180, 54, 215, 220, 44, 242, 69, 37, 63, 156, 39, 167, 0, 121, 79, 42, 69, 63, 158, 173, 118, 39, 83, 73, 2, 136, 233, 176, 129, 130, 199, 115, 38, 255, 230, 19, 145, 10, 28, 232, 118, 229, 180, 225, 92, 84, 190, 255, 7, 232, 88, 158, 26, 100, 252, 6, 195, 157, 157, 10, 40, 94, 75, 178, 82, 49, 2, 26, 218, 239, 93, 39, 248, 19, 209, 127, 220, 235, 233, 213, 149, 141, 245, 13, 247, 6, 234, 134, 187, 254, 150, 175, 108, 184, 165, 62, 81, 166, 218, 87, 86, 251, 200, 172, 187, 174, 71, 51, 68, 11, 187, 110, 25, 129, 178, 129, 175, 110, 137, 9, 252, 121, 72, 129, 155, 194, 56, 16, 255, 234, 98, 94, 223, 7, 109, 143, 70, 197, 0, 226, 9, 15, 186, 174, 75, 4, 227, 28, 228, 199, 43, 98, 22, 175, 180, 120, 161, 60, 1, 55, 132, 43, 255, 0, 158, 211, 102, 0, 128, 74, 155, 25, 13, 144, 50, 210, 157, 185, 78, 85, 174, 134, 143, 73, 6, 67, 161, 198, 166, 42, 153, 240, 135, 66, 85, 131, 85, 4, 7, 227, 89, 213, 216, 88, 214, 212, 52, 88, 91, 251, 228, 160, 200, 28, 34, 104, 172, 226, 89, 214, 216, 216, 244, 228, 96, 107, 35, 194, 170, 198, 142, 9, 174, 247, 49, 217, 195, 6, 154, 23, 231, 73, 89, 247, 251, 76, 190, 220, 60, 39, 150, 177, 60, 138, 92, 48, 186, 108, 202, 23, 124, 204, 27, 201, 205, 139, 252, 4, 6, 144, 100, 236, 159, 77, 1, 215, 51, 89, 3, 208, 139, 192, 66, 40, 3, 120, 198, 149, 211, 6, 253, 2, 195, 95, 160, 99, 58, 58, 160, 139, 23, 97, 30, 90, 106, 150, 233, 90, 70, 24, 56, 237, 222, 238, 247, 87, 187, 187, 219, 247, 187, 187, 151, 164, 223, 119, 15, 239, 39, 42, 208, 221, 188, 27, 158, 222, 232, 110, 135, 83, 127, 99, 169, 219, 189, 177, 36, 227, 192, 134, 27, 3, 200, 92, 63, 118, 12, 11, 200, 179, 129, 76, 244, 210, 181, 155, 24, 129, 224, 161, 155, 215, 10, 181, 15, 218, 136, 38, 119, 61, 202, 28, 32, 17, 244, 4, 19, 193, 58, 84, 92, 135, 207, 149, 34, 99, 111, 92, 249, 7, 120, 182, 213, 163, 111, 249, 183, 170, 148, 178, 93, 185, 78, 85, 110, 176, 163, 188, 53, 36, 31, 77, 52, 54, 242, 96, 143, 76, 230, 118, 141, 33, 168, 199, 81, 54, 216, 138, 242, 165, 120, 48, 228, 160, 140, 121, 95, 83, 43, 41, 92, 174, 84, 242, 233, 65, 71, 220, 183, 118, 120, 219, 0, 150, 183, 182, 72, 151, 23, 142, 106, 3, 192, 34, 48, 128, 197, 209, 17, 20, 14, 22, 76, 3, 16, 57, 21, 193, 40, 22, 115, 194, 155, 74, 86, 164, 120, 249, 23, 121, 83, 100, 201, 88, 51, 0, 94, 247, 20, 152, 247, 4, 249, 81, 37, 112, 144, 211, 198, 110, 23, 253, 131, 60, 19, 32, 67, 36, 33, 80, 97, 119, 50, 181, 114, 234, 10, 74, 68, 86, 191, 8, 196, 0, 232, 225, 221, 221, 42, 26, 216, 6, 209, 227, 190, 150, 48, 113, 58, 122, 88, 46, 199, 32, 186, 225, 95, 19, 62, 110, 157, 250, 22, 119, 243, 10, 16, 175, 144, 215, 51, 25, 173, 217, 215, 163, 167, 212, 68, 112, 230, 90, 230, 226, 165, 153, 155, 55, 103, 46, 93, 204, 92, 187, 165, 38, 128, 167, 46, 178, 240, 87, 136, 210, 249, 249, 185, 30, 109, 195, 0, 18, 229, 137, 120, 34, 40, 61, 60, 24, 79, 20, 133, 247, 198, 149, 127, 128, 160, 199, 163, 87, 245, 173, 42, 165, 108, 87, 174, 83, 149, 11, 213, 149, 103, 253, 102, 121, 120, 86, 181, 134, 176, 4, 178, 173, 194, 26, 171, 228, 225, 41, 231, 143, 255, 6, 74, 39, 21, 211, 8, 57, 160, 100, 59, 140, 129, 247, 190, 248, 241, 140, 138, 0, 33, 49, 33, 37, 40, 208, 23, 207, 159, 81, 113, 1, 94, 164, 0, 254, 247, 114, 168, 146, 255, 36, 6, 112, 47, 58, 173, 16, 3, 160, 87, 231, 30, 250, 128, 44, 211, 5, 230, 181, 208, 156, 54, 69, 118, 153, 228, 26, 162, 214, 48, 31, 199, 102, 161, 95, 244, 94, 59, 115, 107, 13, 170, 25, 218, 8, 4, 42, 150, 140, 247, 145, 207, 4, 159, 202, 151, 71, 159, 126, 250, 1, 89, 13, 38, 27, 121, 96, 246, 33, 197, 212, 51, 119, 37, 117, 181, 225, 215, 193, 163, 252, 170, 132, 31, 197, 47, 98, 3, 168, 156, 129, 0, 156, 154, 121, 8, 156, 186, 136, 222, 145, 169, 39, 80, 79, 181, 19, 152, 143, 131, 123, 229, 114, 195, 191, 152, 57, 80, 135, 90, 213, 155, 183, 253, 41, 35, 221, 153, 235, 84, 114, 24, 128, 196, 89, 228, 12, 9, 59, 0, 114, 95, 26, 2, 115, 192, 5, 50, 54, 76, 78, 162, 110, 126, 41, 147, 186, 173, 173, 114, 165, 100, 146, 186, 65, 227, 85, 162, 63, 154, 32, 229, 23, 110, 21, 0, 75, 78, 185, 78, 7, 44, 249, 171, 104, 157, 142, 47, 125, 61, 229, 37, 157, 117, 23, 90, 0, 5, 36, 195, 10, 228, 213, 192, 144, 211, 70, 69, 9, 66, 177, 168, 214, 82, 46, 48, 204, 46, 142, 1, 144, 132, 195, 166, 148, 98, 176, 253, 122, 0, 118, 239, 146, 107, 22, 84, 43, 204, 110, 155, 28, 15, 65, 123, 33, 68, 164, 99, 204, 82, 71, 118, 143, 83, 143, 222, 141, 215, 183, 141, 224, 33, 13, 180, 159, 85, 122, 65, 173, 255, 110, 0, 118, 249, 167, 48, 220, 105, 63, 129, 42, 165, 108, 87, 174, 83, 149, 243, 116, 4, 131, 76, 160, 179, 110, 180, 128, 204, 168, 9, 183, 201, 165, 217, 14, 36, 20, 231, 1, 161, 44, 28, 38, 69, 22, 244, 59, 95, 5, 207, 235, 63, 129, 230, 104, 55, 159, 91, 117, 178, 6, 0, 207, 49, 128, 20, 35, 0, 169, 219, 236, 239, 59, 2, 83, 192, 0, 172, 54, 56, 62, 48, 167, 1, 244, 231, 44, 32, 138, 150, 86, 176, 115, 14, 41, 0, 18, 17, 130, 10, 47, 74, 5, 238, 66, 48, 204, 40, 96, 116, 40, 155, 74, 121, 34, 140, 69, 100, 8, 83, 50, 146, 171, 104, 208, 64, 50, 109, 185, 250, 197, 8, 24, 247, 181, 174, 53, 164, 110, 84, 106, 103, 218, 50, 60, 239, 57, 88, 160, 208, 189, 114, 89, 213, 19, 202, 93, 95, 244, 183, 171, 148, 178, 93, 185, 78, 85, 174, 4, 87, 99, 252, 89, 80, 212, 42, 83, 137, 37, 207, 103, 84, 123, 117, 239, 216, 151, 75, 188, 251, 80, 188, 130, 87, 1, 205, 90, 16, 69, 23, 112, 133, 156, 54, 242, 175, 43, 178, 155, 40, 42, 64, 133, 132, 90, 99, 136, 64, 215, 26, 118, 160, 40, 41, 98, 26, 75, 247, 255, 247, 24, 78, 69, 239, 134, 132, 7, 199, 2, 10, 129, 234, 69, 247, 5, 248, 11, 191, 251, 223, 84, 153, 36, 87, 100, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130}
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peterhellberg commented Oct 18, 2017

First frame

Better colors, and support for movement

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peterhellberg commented Oct 18, 2017

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peterhellberg commented Oct 18, 2017

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peterhellberg commented Oct 18, 2017

raycaster

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peterhellberg commented Oct 19, 2017

Corrected perspective

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peterhellberg commented Oct 19, 2017

raycaster-correct-plane

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peterhellberg commented Oct 19, 2017

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peterhellberg commented Oct 19, 2017

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peterhellberg commented Oct 19, 2017

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peterhellberg commented Oct 20, 2017

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peterhellberg commented Oct 20, 2017

Improved textures

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peterhellberg commented Oct 20, 2017

strafe

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peterhellberg commented Oct 20, 2017

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peterhellberg commented Oct 20, 2017

raycaster-turn

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peterhellberg commented Oct 21, 2017

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peterhellberg commented Oct 21, 2017

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peterhellberg commented Jan 8, 2018

screen shot 2018-01-08 at 19 33 40

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peterhellberg commented Jan 8, 2018

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peterhellberg commented Jan 9, 2018

minimal-dungeon

screen shot 2018-01-09 at 01 49 14

spritesforyou-1024x16

package main

import (
	"bytes"
	"flag"
	"image"
	"image/color"
	"image/draw"
	"image/png"
	"math"
	"time"

	"github.com/faiface/pixel"
	"github.com/faiface/pixel/pixelgl"
)

const texSize = 16

var (
	fullscreen   = false
	width        = 320
	height       = 200
	scale        = 3.0
	wallDistance = 8.0

	pos   = pixel.V(9, 9)
	dir   = pixel.V(-1.0, 0.0)
	plane = pixel.V(0.0, 0.66)

	textures = loadTextures()
)

var world = [18][18]int{
	{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 0},
	{64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 17},
	{63, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18},
	{62, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 19},
	{61, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 20},
	{60, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 21},
	{59, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 22},
	{58, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 23},
	{57, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 24},
	{56, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 25},
	{55, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 26},
	{54, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 27},
	{53, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28},
	{52, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 29},
	{51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30},
	{50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31},
	{49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32},
	{0, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 0},
}

func frame() *image.RGBA {
	m := image.NewRGBA(image.Rect(0, 0, width, height))

	for x := 0; x < width; x++ {
		var (
			step         image.Point
			sideDist     pixel.Vec
			perpWallDist float64
			hit, side    bool

			rayPos, worldX, worldY = pos, int(pos.X), int(pos.Y)

			cameraX = 2*float64(x)/float64(width) - 1

			rayDir = pixel.V(
				dir.X+plane.X*cameraX,
				dir.Y+plane.Y*cameraX,
			)

			deltaDist = pixel.V(
				math.Sqrt(1.0+(rayDir.Y*rayDir.Y)/(rayDir.X*rayDir.X)),
				math.Sqrt(1.0+(rayDir.X*rayDir.X)/(rayDir.Y*rayDir.Y)),
			)
		)

		if rayDir.X < 0 {
			step.X = -1
			sideDist.X = (rayPos.X - float64(worldX)) * deltaDist.X
		} else {
			step.X = 1
			sideDist.X = (float64(worldX) + 1.0 - rayPos.X) * deltaDist.X
		}

		if rayDir.Y < 0 {
			step.Y = -1
			sideDist.Y = (rayPos.Y - float64(worldY)) * deltaDist.Y
		} else {
			step.Y = 1
			sideDist.Y = (float64(worldY) + 1.0 - rayPos.Y) * deltaDist.Y
		}

		for !hit {
			if sideDist.X < sideDist.Y {
				sideDist.X += deltaDist.X
				worldX += step.X
				side = false
			} else {
				sideDist.Y += deltaDist.Y
				worldY += step.Y
				side = true
			}

			if world[worldX][worldY] > 0 {
				hit = true
			}
		}

		var wallX float64

		if side {
			perpWallDist = (float64(worldY) - rayPos.Y + (1-float64(step.Y))/2) / rayDir.Y
			wallX = rayPos.X + perpWallDist*rayDir.X
		} else {
			perpWallDist = (float64(worldX) - rayPos.X + (1-float64(step.X))/2) / rayDir.X
			wallX = rayPos.Y + perpWallDist*rayDir.Y
		}

		if x == width/2 {
			wallDistance = perpWallDist
		}

		wallX -= math.Floor(wallX)

		texX := int(wallX * float64(texSize))

		lineHeight := int(float64(height) / perpWallDist)

		if lineHeight < 1 {
			lineHeight = 1
		}

		drawStart := -lineHeight/2 + height/2
		if drawStart < 0 {
			drawStart = 0
		}

		drawEnd := lineHeight/2 + height/2
		if drawEnd >= height {
			drawEnd = height - 1
		}

		if !side && rayDir.X > 0 {
			texX = texSize - texX - 1
		}

		if side && rayDir.Y < 0 {
			texX = texSize - texX - 1
		}

		texNum := world[worldX][worldY]

		for y := drawStart; y < drawEnd+1; y++ {
			d := y*256 - height*128 + lineHeight*128
			texY := ((d * texSize) / lineHeight) / 256

			c := textures.RGBAAt(
				texX+texSize*(texNum),
				texY%texSize,
			)

			m.Set(x, y, c)
		}

		var floorWall pixel.Vec

		if !side && rayDir.X > 0 {
			floorWall.X = float64(worldX)
			floorWall.Y = float64(worldY) + wallX
		} else if !side && rayDir.X < 0 {
			floorWall.X = float64(worldX) + 1.0
			floorWall.Y = float64(worldY) + wallX
		} else if side && rayDir.Y > 0 {
			floorWall.X = float64(worldX) + wallX
			floorWall.Y = float64(worldY)
		} else {
			floorWall.X = float64(worldX) + wallX
			floorWall.Y = float64(worldY) + 1.0
		}

		distWall, distPlayer := perpWallDist, 0.0

		for y := drawEnd + 1; y < height; y++ {
			currentDist := float64(height) / (2.0*float64(y) - float64(height))

			weight := (currentDist - distPlayer) / (distWall - distPlayer)

			currentFloor := pixel.V(
				weight*floorWall.X+(1.0-weight)*pos.X,
				weight*floorWall.Y+(1.0-weight)*pos.Y,
			)

			fx := int(currentFloor.X*float64(texSize)) % texSize
			fy := int(currentFloor.Y*float64(texSize)) % texSize

			m.Set(x, y, textures.At(fx+texSize*17, fy))
			m.Set(x, height-y, textures.At(fx+texSize*61, fy))
		}
	}

	return m
}

func run() {
	cfg := pixelgl.WindowConfig{
		Bounds:      pixel.R(0, 0, float64(width)*scale, float64(height)*scale),
		VSync:       true,
		Undecorated: true,
	}

	if fullscreen {
		cfg.Monitor = pixelgl.PrimaryMonitor()
	}

	win, err := pixelgl.NewWindow(cfg)
	if err != nil {
		panic(err)
	}

	c := win.Bounds().Center()

	last := time.Now()

	for !win.Closed() {
		if win.JustPressed(pixelgl.KeyEscape) || win.JustPressed(pixelgl.KeyQ) {
			return
		}

		win.Clear(color.Black)

		dt := time.Since(last).Seconds()
		last = time.Now()

		if win.Pressed(pixelgl.KeyUp) || win.Pressed(pixelgl.KeyW) {
			moveForward(3.5 * dt)
		}

		if win.Pressed(pixelgl.KeyA) {
			moveLeft(3.5 * dt)
		}

		if win.Pressed(pixelgl.KeyDown) || win.Pressed(pixelgl.KeyS) {
			moveBackwards(3.5 * dt)
		}

		if win.Pressed(pixelgl.KeyD) {
			moveRight(3.5 * dt)
		}

		if win.Pressed(pixelgl.KeyRight) {
			turnRight(1.2 * dt)
		}

		if win.Pressed(pixelgl.KeyLeft) {
			turnLeft(1.2 * dt)
		}

		p := pixel.PictureDataFromImage(frame())

		pixel.NewSprite(p, p.Bounds()).
			Draw(win, pixel.IM.Moved(c).Scaled(c, scale))

		win.Update()
	}
}

func moveForward(s float64) {
	if wallDistance > 0.3 {
		if world[int(pos.X+dir.X*s)][int(pos.Y)] == 0 {
			pos.X += dir.X * s
		}

		if world[int(pos.X)][int(pos.Y+dir.Y*s)] == 0 {
			pos.Y += dir.Y * s
		}
	}
}

func moveLeft(s float64) {
	if world[int(pos.X-plane.X*s)][int(pos.Y)] == 0 {
		pos.X -= plane.X * s
	}

	if world[int(pos.X)][int(pos.Y-plane.Y*s)] == 0 {
		pos.Y -= plane.Y * s
	}
}

func moveBackwards(s float64) {
	if world[int(pos.X-dir.X*s)][int(pos.Y)] == 0 {
		pos.X -= dir.X * s
	}

	if world[int(pos.X)][int(pos.Y-dir.Y*s)] == 0 {
		pos.Y -= dir.Y * s
	}
}

func moveRight(s float64) {
	if world[int(pos.X+plane.X*s)][int(pos.Y)] == 0 {
		pos.X += plane.X * s
	}

	if world[int(pos.X)][int(pos.Y+plane.Y*s)] == 0 {
		pos.Y += plane.Y * s
	}
}

func turnRight(s float64) {
	oldDirX := dir.X

	dir.X = dir.X*math.Cos(-s) - dir.Y*math.Sin(-s)
	dir.Y = oldDirX*math.Sin(-s) + dir.Y*math.Cos(-s)

	oldPlaneX := plane.X

	plane.X = plane.X*math.Cos(-s) - plane.Y*math.Sin(-s)
	plane.Y = oldPlaneX*math.Sin(-s) + plane.Y*math.Cos(-s)
}

func turnLeft(s float64) {
	oldDirX := dir.X

	dir.X = dir.X*math.Cos(s) - dir.Y*math.Sin(s)
	dir.Y = oldDirX*math.Sin(s) + dir.Y*math.Cos(s)

	oldPlaneX := plane.X

	plane.X = plane.X*math.Cos(s) - plane.Y*math.Sin(s)
	plane.Y = oldPlaneX*math.Sin(s) + plane.Y*math.Cos(s)
}

func main() {
	flag.BoolVar(&fullscreen, "f", fullscreen, "fullscreen")
	flag.IntVar(&width, "w", width, "width")
	flag.IntVar(&height, "h", height, "height")
	flag.Float64Var(&scale, "s", scale, "scale")
	flag.Parse()

	pixelgl.Run(run)
}

func loadTextures() *image.RGBA {
	p, err := png.Decode(bytes.NewReader(textureData))
	if err != nil {
		panic(err)
	}

	m := image.NewRGBA(p.Bounds())

	draw.Draw(m, m.Bounds(), p, image.ZP, draw.Src)

	return m
}

// https://opengameart.org/content/early-80s-arcade-pixel-art-dungeonsslimes-walls-power-ups-etc
// 64 16x16 sprites (1024x16)
var textureData = []byte{137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 4, 0, 0, 0, 0, 16, 4, 3, 0, 0, 0, 122, 170, 16, 56, 0, 0, 0, 30, 80, 76, 84, 69, 0, 0, 0, 0, 183, 239, 255, 184, 71, 33, 33, 222, 255, 255, 0, 239, 52, 36, 0, 0, 0, 1, 255, 0, 255, 255, 255, 255, 0, 0, 186, 211, 59, 191, 0, 0, 0, 1, 116, 82, 78, 83, 0, 64, 230, 216, 102, 0, 0, 7, 123, 73, 68, 65, 84, 104, 222, 213, 153, 77, 111, 211, 64, 16, 134, 23, 5, 202, 121, 107, 9, 229, 138, 147, 220, 227, 14, 114, 57, 162, 176, 49, 229, 134, 34, 175, 197, 177, 81, 146, 69, 189, 33, 129, 200, 57, 2, 36, 255, 0, 84, 169, 255, 150, 249, 216, 181, 221, 108, 92, 82, 194, 133, 177, 221, 199, 51, 113, 139, 240, 188, 126, 119, 189, 81, 181, 196, 247, 99, 25, 182, 220, 135, 145, 152, 31, 203, 176, 109, 125, 104, 173, 95, 60, 116, 224, 239, 20, 15, 29, 86, 162, 4, 137, 76, 251, 176, 62, 102, 62, 192, 71, 200, 213, 153, 115, 238, 90, 97, 80, 245, 100, 254, 135, 225, 48, 16, 59, 205, 145, 52, 28, 214, 90, 15, 119, 73, 141, 39, 24, 109, 93, 215, 181, 30, 98, 238, 55, 231, 99, 150, 114, 76, 26, 142, 77, 154, 142, 103, 19, 131, 39, 24, 161, 142, 52, 38, 29, 99, 238, 183, 70, 0, 89, 146, 235, 76, 231, 9, 128, 28, 120, 174, 1, 155, 79, 92, 161, 0, 202, 121, 101, 74, 83, 205, 173, 149, 3, 207, 141, 197, 230, 19, 55, 141, 0, 12, 72, 232, 125, 1, 140, 125, 128, 143, 212, 199, 153, 123, 255, 254, 125, 129, 10, 24, 160, 102, 146, 105, 15, 85, 196, 190, 235, 255, 155, 64, 217, 163, 246, 145, 75, 124, 188, 92, 71, 0, 49, 81, 3, 146, 99, 243, 165, 158, 96, 238, 183, 220, 71, 211, 224, 152, 168, 1, 201, 177, 249, 72, 170, 166, 145, 0, 168, 233, 251, 135, 6, 112, 204, 28, 28, 53, 125, 255, 48, 214, 58, 102, 101, 157, 173, 57, 12, 56, 14, 221, 231, 0, 175, 129, 226, 59, 132, 220, 253, 186, 117, 110, 125, 235, 212, 64, 99, 76, 213, 169, 196, 232, 49, 130, 71, 215, 173, 61, 165, 30, 255, 253, 237, 182, 83, 60, 219, 88, 231, 108, 117, 173, 150, 154, 12, 22, 5, 144, 100, 7, 5, 80, 183, 249, 16, 159, 124, 201, 51, 29, 59, 192, 100, 113, 80, 0, 166, 205, 199, 248, 228, 75, 190, 104, 5, 240, 237, 155, 8, 128, 154, 189, 223, 252, 238, 65, 205, 222, 111, 126, 123, 136, 0, 174, 234, 43, 22, 64, 238, 242, 251, 2, 168, 186, 14, 144, 233, 174, 3, 220, 20, 78, 161, 11, 20, 42, 75, 207, 207, 95, 38, 42, 166, 214, 231, 233, 40, 166, 220, 174, 152, 10, 182, 91, 8, 55, 190, 229, 227, 235, 54, 77, 109, 104, 172, 231, 95, 213, 177, 89, 64, 252, 106, 222, 117, 20, 224, 236, 207, 106, 243, 209, 58, 181, 162, 254, 231, 36, 128, 221, 158, 0, 120, 28, 5, 47, 0, 216, 177, 1, 236, 68, 0, 175, 99, 7, 192, 102, 238, 9, 192, 46, 144, 214, 72, 110, 103, 108, 0, 51, 17, 64, 25, 11, 32, 17, 1, 180, 34, 200, 233, 220, 185, 192, 185, 8, 160, 21, 65, 69, 231, 206, 121, 146, 0, 126, 212, 63, 88, 0, 43, 183, 234, 8, 96, 49, 177, 248, 107, 157, 57, 64, 130, 27, 36, 33, 191, 33, 7, 248, 245, 171, 80, 23, 163, 52, 189, 24, 169, 136, 217, 249, 203, 116, 116, 128, 23, 26, 227, 0, 7, 91, 140, 105, 104, 108, 224, 227, 235, 207, 82, 140, 15, 161, 177, 129, 143, 175, 15, 134, 216, 74, 252, 251, 207, 175, 126, 152, 237, 103, 21, 98, 243, 177, 182, 246, 167, 173, 212, 42, 91, 46, 87, 249, 129, 33, 32, 209, 67, 22, 128, 232, 2, 118, 108, 0, 232, 8, 242, 233, 159, 231, 0, 147, 116, 204, 2, 16, 93, 216, 25, 27, 0, 58, 130, 124, 218, 10, 64, 20, 240, 201, 157, 24, 150, 12, 192, 240, 16, 144, 59, 232, 12, 1, 147, 133, 157, 116, 231, 0, 25, 224, 158, 181, 14, 112, 247, 235, 246, 189, 41, 30, 18, 64, 154, 142, 210, 105, 196, 62, 1, 92, 110, 141, 217, 126, 9, 141, 13, 124, 124, 125, 65, 147, 165, 73, 104, 108, 224, 227, 235, 79, 234, 154, 231, 38, 79, 235, 218, 188, 235, 8, 160, 254, 105, 49, 72, 0, 0, 112, 140, 0, 216, 0, 194, 144, 0, 16, 57, 192, 159, 4, 192, 6, 16, 134, 4, 107, 163, 73, 224, 11, 141, 177, 212, 49, 151, 72, 167, 77, 97, 48, 214, 38, 230, 26, 233, 140, 101, 3, 64, 1, 176, 1, 220, 155, 3, 164, 209, 91, 128, 78, 160, 113, 0, 119, 135, 207, 191, 43, 20, 164, 216, 113, 80, 17, 7, 58, 197, 142, 199, 4, 190, 15, 17, 7, 91, 131, 177, 157, 134, 198, 122, 62, 186, 254, 44, 165, 122, 250, 33, 52, 214, 243, 209, 117, 149, 145, 0, 0, 71, 128, 186, 246, 99, 192, 211, 55, 44, 0, 235, 5, 0, 73, 43, 128, 36, 235, 206, 246, 119, 196, 70, 0, 100, 0, 44, 12, 248, 174, 19, 125, 216, 1, 38, 139, 238, 108, 127, 70, 108, 4, 64, 6, 192, 194, 176, 243, 67, 147, 64, 52, 125, 148, 213, 18, 144, 64, 204, 94, 232, 4, 178, 101, 134, 124, 65, 68, 211, 55, 214, 174, 45, 210, 18, 203, 194, 204, 109, 185, 46, 145, 5, 209, 178, 1, 160, 0, 216, 0, 58, 2, 88, 60, 252, 22, 112, 227, 220, 93, 225, 206, 138, 129, 190, 192, 190, 234, 233, 62, 197, 2, 16, 123, 28, 104, 154, 245, 235, 233, 62, 47, 191, 190, 125, 245, 246, 213, 187, 47, 161, 177, 158, 88, 71, 64, 79, 221, 196, 245, 197, 120, 110, 76, 57, 155, 132, 198, 6, 46, 198, 166, 191, 110, 226, 186, 202, 134, 59, 17, 192, 213, 15, 47, 128, 171, 119, 60, 4, 216, 216, 1, 184, 173, 241, 36, 80, 4, 192, 138, 24, 82, 61, 235, 123, 11, 224, 182, 198, 147, 64, 17, 0, 43, 98, 76, 245, 197, 33, 1, 228, 60, 3, 88, 230, 65, 0, 148, 231, 152, 7, 86, 60, 3, 88, 87, 65, 0, 148, 87, 152, 7, 90, 54, 128, 43, 3, 108, 0, 185, 62, 118, 29, 224, 230, 250, 236, 166, 80, 103, 5, 77, 149, 0, 127, 8, 207, 71, 23, 47, 37, 87, 3, 36, 40, 37, 156, 170, 144, 135, 235, 247, 121, 105, 72, 0, 230, 75, 16, 130, 52, 24, 73, 0, 170, 19, 187, 117, 142, 144, 55, 92, 152, 121, 57, 47, 205, 36, 8, 65, 26, 140, 36, 88, 67, 121, 84, 199, 8, 121, 67, 154, 156, 138, 0, 48, 21, 1, 24, 250, 233, 44, 135, 235, 58, 64, 220, 248, 132, 41, 147, 64, 54, 0, 108, 57, 85, 95, 199, 14, 112, 176, 241, 19, 166, 76, 2, 217, 0, 176, 229, 84, 45, 99, 1, 252, 131, 57, 128, 169, 127, 240, 28, 128, 70, 129, 61, 1, 44, 58, 14, 240, 250, 190, 3, 92, 43, 22, 192, 197, 75, 141, 113, 62, 218, 167, 220, 64, 165, 132, 35, 79, 1, 157, 17, 229, 122, 201, 67, 67, 69, 8, 68, 120, 245, 22, 136, 28, 66, 159, 183, 245, 152, 161, 161, 34, 4, 162, 45, 231, 150, 200, 33, 244, 121, 91, 143, 201, 67, 19, 41, 150, 156, 69, 94, 4, 159, 127, 150, 215, 64, 140, 234, 186, 227, 0, 16, 11, 32, 107, 28, 1, 196, 0, 180, 8, 64, 31, 114, 0, 27, 11, 96, 209, 56, 130, 21, 3, 72, 69, 0, 105, 44, 0, 189, 212, 180, 235, 67, 116, 8, 179, 54, 180, 155, 67, 116, 8, 203, 6, 128, 2, 96, 3, 112, 199, 59, 128, 35, 1, 56, 20, 0, 89, 248, 249, 72, 8, 24, 68, 17, 0, 254, 244, 141, 159, 170, 144, 247, 93, 127, 201, 253, 61, 220, 88, 212, 68, 84, 127, 72, 0, 214, 244, 52, 118, 94, 134, 252, 143, 164, 5, 170, 132, 223, 2, 232, 53, 240, 179, 106, 194, 137, 1, 56, 113, 0, 135, 2, 120, 29, 11, 96, 200, 148, 58, 27, 0, 229, 34, 128, 216, 1, 202, 88, 0, 99, 166, 212, 217, 0, 48, 239, 17, 0, 44, 19, 88, 210, 244, 124, 9, 180, 67, 178, 196, 93, 39, 25, 114, 181, 212, 171, 204, 174, 231, 22, 71, 250, 18, 221, 159, 118, 59, 95, 227, 142, 119, 2, 185, 89, 155, 77, 105, 217, 0, 80, 0, 108, 0, 247, 5, 176, 152, 180, 115, 0, 157, 236, 205, 1, 110, 221, 77, 225, 214, 5, 253, 147, 244, 44, 8, 21, 134, 228, 216, 112, 16, 1, 36, 58, 77, 136, 146, 247, 93, 223, 181, 114, 216, 163, 9, 124, 123, 25, 24, 234, 17, 187, 86, 110, 247, 104, 2, 231, 139, 192, 80, 143, 168, 6, 128, 65, 2, 216, 98, 124, 238, 174, 4, 137, 1, 184, 21, 245, 63, 239, 93, 9, 172, 119, 62, 103, 3, 8, 2, 56, 126, 37, 208, 204, 124, 206, 6, 208, 47, 128, 220, 55, 30, 90, 230, 196, 156, 153, 65, 229, 27, 111, 91, 86, 196, 138, 89, 90, 75, 6, 64, 2, 96, 3, 232, 10, 96, 195, 111, 130, 141, 3, 100, 192, 123, 200, 221, 221, 237, 77, 177, 46, 250, 87, 2, 51, 118, 80, 98, 38, 2, 144, 188, 239, 250, 193, 246, 43, 141, 181, 211, 7, 105, 2, 251, 175, 123, 150, 142, 177, 127, 233, 135, 7, 105, 2, 251, 175, 107, 191, 163, 216, 98, 32, 186, 22, 224, 148, 90, 129, 195, 128, 94, 1, 64, 237, 23, 132, 118, 108, 0, 205, 16, 0, 125, 115, 128, 61, 90, 227, 23, 132, 102, 108, 0, 205, 16, 96, 187, 2, 248, 198, 2, 72, 238, 9, 0, 243, 188, 33, 162, 90, 207, 239, 9, 0, 243, 170, 33, 162, 119, 41, 152, 173, 46, 109, 28, 32, 44, 4, 181, 223, 5, 220, 221, 24, 236, 191, 146, 137, 28, 122, 123, 58, 66, 114, 142, 167, 93, 33, 36, 16, 190, 3, 192, 122, 239, 245, 151, 91, 140, 47, 167, 83, 22, 86, 79, 102, 188, 20, 220, 90, 0, 26, 128, 114, 192, 150, 232, 98, 1, 96, 157, 180, 94, 139, 203, 65, 231, 243, 12, 113, 196, 58, 128, 181, 244, 190, 111, 44, 197, 196, 118, 62, 95, 32, 186, 2, 224, 181, 32, 121, 226, 243, 85, 71, 0, 14, 247, 149, 243, 148, 39, 190, 218, 116, 4, 224, 112, 223, 56, 207, 210, 72, 100, 90, 162, 127, 14, 144, 233, 238, 119, 1, 10, 21, 96, 28, 246, 53, 77, 167, 116, 208, 3, 19, 206, 229, 209, 1, 121, 239, 191, 64, 92, 208, 147, 78, 203, 3, 208, 127, 253, 224, 18, 251, 55, 61, 157, 207, 232, 54, 125, 56, 157, 253, 225, 28, 201, 192, 209, 227, 229, 174, 213, 119, 144, 56, 158, 178, 57, 31, 115, 43, 113, 60, 101, 251, 87, 111, 1, 198, 135, 150, 56, 250, 219, 64, 186, 5, 248, 223, 167, 161, 114, 74, 135, 82, 221, 115, 201, 48, 216, 73, 165, 68, 217, 31, 174, 159, 254, 11, 62, 179, 246, 195, 169, 60, 254, 235, 224, 223, 208, 209, 57, 120, 205, 245, 231, 124, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130}
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