// http://fabiensanglard.net/doom_fire_psx/ package main import ( "fmt" "image" "image/color" "log" "math/rand" "time" "github.com/disintegration/imaging" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) var palette = color.Palette{ color.RGBA{0x00, 0x00, 0x00, 0xff}, color.RGBA{0x07, 0x07, 0x07, 0xff}, color.RGBA{0x1f, 0x07, 0x07, 0xff}, color.RGBA{0x2f, 0x0f, 0x07, 0xff}, color.RGBA{0x47, 0x0f, 0x07, 0xff}, color.RGBA{0x57, 0x17, 0x07, 0xff}, color.RGBA{0x67, 0x1f, 0x07, 0xff}, color.RGBA{0x77, 0x1f, 0x07, 0xff}, color.RGBA{0x8f, 0x27, 0x07, 0xff}, color.RGBA{0x9f, 0x2f, 0x07, 0xff}, color.RGBA{0xaf, 0x3f, 0x07, 0xff}, color.RGBA{0xbf, 0x47, 0x07, 0xff}, color.RGBA{0xc7, 0x47, 0x07, 0xff}, color.RGBA{0xdf, 0x4f, 0x07, 0xff}, color.RGBA{0xdf, 0x57, 0x07, 0xff}, color.RGBA{0xdf, 0x57, 0x07, 0xff}, color.RGBA{0xd7, 0x5f, 0x07, 0xff}, color.RGBA{0xd7, 0x67, 0x0f, 0xff}, color.RGBA{0xcf, 0x6f, 0x0f, 0xff}, color.RGBA{0xcf, 0x77, 0x0f, 0xff}, color.RGBA{0xcf, 0x7f, 0x0f, 0xff}, color.RGBA{0xcf, 0X87, 0x17, 0xff}, color.RGBA{0xc7, 0x87, 0x17, 0xff}, color.RGBA{0xc7, 0x8f, 0x17, 0xff}, color.RGBA{0xc7, 0x97, 0x1f, 0xff}, color.RGBA{0xbf, 0X9f, 0X1f, 0xff}, color.RGBA{0xbf, 0x9f, 0x1f, 0xff}, color.RGBA{0xbf, 0xa7, 0x27, 0xff}, color.RGBA{0xbf, 0xa7, 0x27, 0xff}, color.RGBA{0xbf, 0xaf, 0x2f, 0xff}, color.RGBA{0xb7, 0xaf, 0x2f, 0xff}, color.RGBA{0xb7, 0xb7, 0x2f, 0xff}, color.RGBA{0xb7, 0xb7, 0x37, 0xff}, color.RGBA{0xcf, 0xcf, 0x6f, 0xff}, color.RGBA{0xdf, 0xdf, 0x9f, 0xff}, color.RGBA{0xef, 0xef, 0xc7, 0xff}, color.RGBA{0xff, 0xff, 0xff, 0xff}, } const ( screenWidth = 320 screenHeight = 200 scale = 2 ) type drawContext struct { buf *image.Paletted } func newDrawContext(x, y int) *drawContext { rand.Seed(time.Now().UnixNano()) img := image.NewPaletted(image.Rect(0, 0, x, y), palette) for x := 0; x < screenWidth; x++ { img.SetColorIndex(x, 0, uint8(len(palette)-1)) } return &drawContext{buf: img} } func (dc *drawContext) update(screen *ebiten.Image) error { r := screen.Bounds() for x := 0; x < r.Max.X; x++ { for y := 1; y < r.Max.Y; y++ { z := rand.Intn(3) n := dc.buf.ColorIndexAt(x, y-1) if n > 0 && z&1 == 0 { n-- } dc.buf.SetColorIndex(x-z+1, y, n) } } if !ebiten.IsDrawingSkipped() { screen.ReplacePixels(imaging.FlipV(dc.buf).Pix) ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.CurrentTPS())) } return nil } func main() { dc := newDrawContext(screenWidth, screenHeight) if err := ebiten.Run(dc.update, screenWidth, screenHeight, scale, "Fire"); err != nil { log.Fatal(err) } }