nope, it's a hopeless mess

See
424f62327b

Thanks a lot for the fast support, amazing!

Makefile

@@ -2,3 +2,8 @@
 all:
 	make -C src
 	mv src/golsky .
+
+.PHONY: clean
+clean:
+	make -C src clean
+	rm -f dump* rect*

README.md

@@ -5,8 +5,7 @@
 [![License](https://img.shields.io/badge/license-GPL-blue.svg)](https://github.com/tlinden/golsky/blob/master/LICENSE)
 [![Go Report Card](https://goreportcard.com/badge/github.com/tlinden/golsky)](https://goreportcard.com/report/github.com/tlinden/golsky) 
 
-I wanted to play around a little bit with [**Conways Game of
+I wanted to play around a little bit with [**Conways Game of Life**](https://conwaylife.com/)
-Life**](https://conwaylife.com/)
 in golang and here's the  result. It's a simple game using
 [ebitengine](https://github.com/hajimehoshi/ebiten/).
 
@@ -14,6 +13,19 @@ John Conway himself: https://youtu.be/R9Plq-D1gEk?si=yYxs77e9yXxeSNbL
 
 Based on: https://youtu.be/FWSR_7kZuYg?si=ix1dmo76D8AmF25F
 
+# Screenshots
+[![golsky-mainmenu.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-mainmenu.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-mainmenu.png)
+[![golsky-options.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-options.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-options.png)
+[![golsky-bindings.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-bindings.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-bindings.png)
+[![golsky-evolution-trace.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-evolution-trace.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-evolution-trace.png)
+[![golsky-zoom.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-zoom.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-zoom.png)
+[![golsky-debug.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-debug.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-debug.png)
+[![golsky-capture.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-capture.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-capture.png)
+[![golsky-captured.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-captured.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-captured.png)
+[![golsky-dark-theme.png](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/256_golsky-dark-theme.png)](https://github.com/TLINDEN/golsky/blob/main/.github/assets/screenshots/golsky-dark-theme.png)
+
+[Youtube video game preview](https://www.youtube.com/watch?v=xEto6Oew16I)
+
 # Features
 
 * flexible parameters as grid and cell size
@@ -76,7 +88,10 @@ While it runs, there are a couple of commands you can use:
 * page up: speed up
 * page down: slow down
 * Mouse wheel: zoom in or out
-* move mouse while middle mouse button pressed: move canvas
+* move mouse while left mouse button pressed: move canvas
+* i: enter "insert" (draw) mode: use left mouse to set cells alife and right
+  button to dead. Leave with "space". While in insert mode, use middle mouse
+  button to drag grid.
 * r: reset to 1:1 zoom
 * escape: open menu
 * s: save game state to file (can be loaded with -l)

TODO.md

@@ -1,14 +1,11 @@
 - add all other options like size etc
-- do not process history if turned off
 - add gif export
 - add toolbar
 - turn input ifs to switch
-- add insert mode for edit like vi
+- only draw visible part of the world
-- use left mouse to drag grid unless insert mode is active
+- use themes instead of the current weird color lists
-- keep supporting middle mouse to drag so that dragging is possible in insert mode
 - print current mode to the bottom like pause, insert and mark
 - add https://www.ibiblio.org/lifepatterns/october1970.html
-- use uint8 or bool, history needs not be larger than 256 anyway
 - history: dont count age but do calc to get index to age tile based on cell age
 - maybe pre calc neighbors as 8 slice of pointers to neighboring cells to faster do the count
 - https://mattnakama.com/blog/go-branchless-coding/
@@ -17,6 +14,8 @@
   WritePixels:   https://github.com/TLINDEN/testgol/tree/wrpixels
 https://www.tasnimzotder.com/blog/optimizing-game-of-life-algorithm
 
+- show gridlines menu has no effect of grid was enabled with -g
+
 - Speed
   https://conwaylife.com/forums/viewtopic.php?f=7&t=3237
   

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895 // indirect
 	github.com/ebitengine/hideconsole v1.0.0 // indirect
 	github.com/ebitengine/purego v0.7.0 // indirect
-	github.com/ebitenui/ebitenui v0.5.6 // indirect
+	github.com/ebitenui/ebitenui v0.5.8-0.20240608230235-27496c28f409 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
 	github.com/tinne26/etxt v0.0.8 // indirect

go.sum

@@ -8,6 +8,10 @@ github.com/ebitengine/purego v0.7.0 h1:HPZpl61edMGCEW6XK2nsR6+7AnJ3unUxpTZBkkIXn
 github.com/ebitengine/purego v0.7.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
 github.com/ebitenui/ebitenui v0.5.6 h1:qyJRU5j+lQo1lamxB48IBwMxMfz1xNb5iWUayCtA0Wk=
 github.com/ebitenui/ebitenui v0.5.6/go.mod h1:I0rVbTOUi7gWKTPet2gzbvhOdkHp5pJXMM6c6b3dRoE=
+github.com/ebitenui/ebitenui v0.5.8-0.20240608175527-424f62327b21 h1:dElhYGyf+FYY+makAndUQNOSDwFSFYyFWziPwQrPObY=
+github.com/ebitenui/ebitenui v0.5.8-0.20240608175527-424f62327b21/go.mod h1:I0rVbTOUi7gWKTPet2gzbvhOdkHp5pJXMM6c6b3dRoE=
+github.com/ebitenui/ebitenui v0.5.8-0.20240608230235-27496c28f409 h1:wsPobs+O3ZmZvhtNtmnMkaB1FRM7tuZ60P0/jegRQGg=
+github.com/ebitenui/ebitenui v0.5.8-0.20240608230235-27496c28f409/go.mod h1:I0rVbTOUi7gWKTPet2gzbvhOdkHp5pJXMM6c6b3dRoE=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/hajimehoshi/ebiten/v2 v2.7.4 h1:X+heODRQ3Ie9F9QFjm24gEZqQd5FSfR9XuT2XfHwgf8=

rle/rle.go

@@ -120,7 +120,7 @@ func removeWhitespace(input string) string {
 }
 
 // Store a grid to an RLE file
-func StoreGridToRLE(grid [][]uint8, filename, rule string, width, height int) error {
+func StoreGridToRLE(grid [][]bool, filename, rule string, width, height int) error {
 	fd, err := os.Create(filename)
 	if err != nil {
 		return err
@@ -131,12 +131,12 @@ func StoreGridToRLE(grid [][]uint8, filename, rule string, width, height int) er
 	for y := 0; y < height; y++ {
 		line := ""
 		for x := 0; x < width; x++ {
-			switch grid[y][x] {
+			char := "b"
-			case 0:
+			if grid[y][x] {
-				line += "b"
+				char = "o"
-			case 1:
-				line += "o"
 			}
+
+			line += char
 		}
 
 		// if first row is: 001011110, then line is now:

src/config.go

@@ -18,7 +18,7 @@ type Config struct {
 	Width, Height, Cellsize, Density         int // measurements
 	ScreenWidth, ScreenHeight                int
 	TPG                                      int      // ticks per generation/game speed, 1==max
-	Debug, Empty, Invert, Paused, Markmode bool     // game modi
+	Debug, Empty, Paused, Markmode, Drawmode bool     // game modi
 	ShowEvolution, ShowGrid, RunOneStep      bool     // flags
 	Rule                                     *Rule    // which rule to use, default: B3/S23
 	RLE                                      *rle.RLE // loaded GOL pattern from RLE file
@@ -33,6 +33,8 @@ type Config struct {
 	ZoomOutFactor                            int
 	InitialCamPos                            []float64
 	DelayedStart                             bool // if true game, we wait. like pause but program induced
+	Theme                                    string
+	ThemeManager                             ThemeManager
 
 	// for internal profiling
 	ProfileFile     string
@@ -42,18 +44,38 @@ type Config struct {
 
 const (
 	VERSION = "v0.0.8"
-	Alive   = 1
+	Alive   = true
-	Dead    = 0
+	Dead    = false
 
 	DEFAULT_GRID_WIDTH  = 600
 	DEFAULT_GRID_HEIGHT = 400
 	DEFAULT_CELLSIZE    = 4
-	DEFAULT_ZOOMFACTOR  = 150
+	DEFAULT_ZOOMFACTOR  = 400
 	DEFAULT_GEOM        = "640x384"
+	DEFAULT_THEME       = "standard" // "light" // inverse => "dark"
 )
 
+const KEYBINDINGS string = `
+- SPACE: pause or resume the game
+- N: while game is paused: forward one step
+- PAGE UP: speed up
+- PAGE DOWN: slow down
+- MOUSE WHEEL: zoom in or out
+- LEFT MOUSE BUTTON: use to drag canvas, keep clicked and move mouse
+- I: enter "insert" (draw) mode: use left mouse to set cells alife and right
+     button to dead. Leave with "space". While in insert mode, use middle mouse
+     button to drag grid.
+- R: reset to 1:1 zoom
+- ESCAPE: open menu, o: open options menu
+- S: save game state to file (can be loaded with -l)
+- C: enter mark mode. Mark a rectangle with the mouse, when you
+     release the mouse buttonx it is being saved to an RLE file
+- D: toggle debug output 
+- Q: quit game
+`
+
 func (config *Config) SetupCamera() {
-	config.Zoomfactor = DEFAULT_ZOOMFACTOR
+	config.Zoomfactor = DEFAULT_ZOOMFACTOR / config.Cellsize
 
 	// calculate the initial cam pos. It is negative if the total grid
 	// size  is smaller than  the screen  in a centered  position, but
@@ -107,7 +129,7 @@ func (config *Config) ParseGeom(geom string) error {
 	config.ScreenWidth = width
 	config.ScreenHeight = height
 
-	config.Cellsize = DEFAULT_CELLSIZE
+	//config.Cellsize = DEFAULT_CELLSIZE
 
 	return nil
 }
@@ -201,18 +223,20 @@ func ParseCommandline() (*Config, error) {
 	pflag.StringVarP(&rlefile, "pattern-file", "f", "", "RLE or LIF pattern file")
 
 	pflag.BoolVarP(&config.ShowVersion, "version", "v", false, "show version")
+	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", false, "draw grid lines")
+	pflag.BoolVarP(&config.ShowEvolution, "show-evolution", "s", false, "show evolution traces")
+
 	pflag.BoolVarP(&config.Paused, "paused", "p", false, "do not start simulation (use space to start)")
 	pflag.BoolVarP(&config.Debug, "debug", "d", false, "show debug info")
-	pflag.BoolVarP(&config.ShowGrid, "show-grid", "g", false, "draw grid lines")
 	pflag.BoolVarP(&config.Empty, "empty", "e", false, "start with an empty screen")
-	pflag.BoolVarP(&config.Invert, "invert", "i", false, "invert colors (dead cell: black)")
+
-	pflag.BoolVarP(&config.ShowEvolution, "show-evolution", "s", false, "show evolution traces")
+	// style
+	pflag.StringVarP(&config.Theme, "theme", "T", DEFAULT_THEME, "color theme: standard, dark, light (default: standard)")
+
 	pflag.BoolVarP(&config.Wrap, "wrap-around", "w", false, "wrap around grid mode")
 	pflag.BoolVarP(&config.UseShader, "use-shader", "k", false, "use shader for cell rendering")
 
 	pflag.StringVarP(&config.ProfileFile, "profile-file", "", "", "enable profiling")
-	pflag.BoolVarP(&config.ProfileDraw, "profile-draw", "", false, "profile draw method (default false)")
-	pflag.Int64VarP(&config.ProfileMaxLoops, "profile-max-loops", "", 10, "how many loops to execute (default 10)")
 
 	pflag.Parse()
 
@@ -234,6 +258,8 @@ func ParseCommandline() (*Config, error) {
 
 	config.SetupCamera()
 
+	config.ThemeManager = NewThemeManager(config.Theme, config.Cellsize)
+
 	//repr.Println(config)
 	return &config, nil
 }
@@ -246,14 +272,16 @@ func (config *Config) ToggleDebugging() {
 	config.Debug = !config.Debug
 }
 
-func (config *Config) ToggleInvert() {
+func (config *Config) SwitchTheme(theme string) {
-	config.Invert = !config.Invert
+	config.ThemeManager.SetCurrentTheme(theme)
 	config.RestartCache = true
 }
 
 func (config *Config) ToggleGridlines() {
+	fmt.Printf("toggle grid lines, current: %t\n", config.ShowGrid)
 	config.ShowGrid = !config.ShowGrid
 	config.RestartCache = true
+	fmt.Printf("toggle grid lines, new: %t\n", config.ShowGrid)
 }
 
 func (config *Config) ToggleEvolution() {

src/game.go

@@ -10,7 +10,6 @@ type Game struct {
 	CurrentScene                                    SceneName
 	Config                                          *Config
 	Scale                                           float32
-	Screen                                          *ebiten.Image
 }
 
 func NewGame(config *Config, startscene SceneName) *Game {
@@ -24,8 +23,10 @@ func NewGame(config *Config, startscene SceneName) *Game {
 	// setup scene[s]
 	game.CurrentScene = startscene
 	game.Scenes[Play] = NewPlayScene(game, config)
+	game.Scenes[Toolbar] = NewToolbarScene(game, config)
 	game.Scenes[Menu] = NewMenuScene(game, config)
 	game.Scenes[Options] = NewOptionsScene(game, config)
+	game.Scenes[Keybindings] = NewKeybindingsScene(game, config)
 
 	// setup environment
 	ebiten.SetWindowSize(game.ScreenWidth, game.ScreenHeight)
@@ -33,7 +34,6 @@ func NewGame(config *Config, startscene SceneName) *Game {
 	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
 	ebiten.SetScreenClearedEveryFrame(true)
 
-	game.Screen = ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
 	return game
 }
 
@@ -48,16 +48,22 @@ func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
 }
 
 func (game *Game) Update() error {
-	scene := game.GetCurrentScene()
+	currentscene := game.GetCurrentScene()
 
+	for _, scene := range game.Scenes {
+		if scene.IsPrimary() || scene == currentscene {
 			if quit := scene.Update(); quit != nil {
 				return quit
 			}
 
-	next := scene.GetNext()
+		}
+	}
+
+	next := currentscene.GetNext()
+
 	if next != game.CurrentScene {
 		game.Scenes[next].SetPrevious(game.CurrentScene)
-		scene.ResetNext()
+		currentscene.ResetNext()
 		game.CurrentScene = next
 	}
 
@@ -66,6 +72,7 @@ func (game *Game) Update() error {
 
 func (game *Game) Draw(screen *ebiten.Image) {
 	// first draw primary scene[s], although there are only 1
+	skip := false
 	for current, scene := range game.Scenes {
 		if scene.IsPrimary() {
 			// primary scenes always draw
@@ -73,10 +80,15 @@ func (game *Game) Draw(screen *ebiten.Image) {
 
 			if current == game.CurrentScene {
 				// avoid to redraw it in the next step
+				skip = true
+				break
+			}
+		}
+	}
+
+	if skip {
 		return
 	}
-		}
-	}
 
 	scene := game.GetCurrentScene()
 	scene.Draw(screen)

src/generics.go

@@ -10,3 +10,10 @@ func Contains[E comparable](s []E, v E) bool {
 
 	return false
 }
+
+func Exists[K comparable, V any](m map[K]V, v K) bool {
+	if _, ok := m[v]; ok {
+		return true
+	}
+	return false
+}

src/grid.go

@@ -13,7 +13,7 @@ import (
 )
 
 type Grid struct {
-	Data                   [][]uint8
+	Data                   [][]bool
 	Width, Height, Density int
 	Empty                  bool
 }
@@ -24,12 +24,12 @@ func NewGrid(width, height, density int, empty bool) *Grid {
 		Height:  height,
 		Width:   width,
 		Density: density,
-		Data:    make([][]uint8, height),
+		Data:    make([][]bool, height),
 		Empty:   empty,
 	}
 
 	for y := 0; y < height; y++ {
-		grid.Data[y] = make([]uint8, width)
+		grid.Data[y] = make([]bool, width)
 	}
 
 	return grid
@@ -59,7 +59,7 @@ func (grid *Grid) Copy(other *Grid) {
 func (grid *Grid) Clear() {
 	for y := range grid.Data {
 		for x := range grid.Data[y] {
-			grid.Data[y][x] = 0
+			grid.Data[y][x] = false
 		}
 	}
 }
@@ -70,7 +70,7 @@ func (grid *Grid) FillRandom() {
 		for y := range grid.Data {
 			for x := range grid.Data[y] {
 				if rand.Intn(grid.Density) == 1 {
-					grid.Data[y][x] = 1
+					grid.Data[y][x] = true
 				}
 			}
 		}
@@ -80,7 +80,7 @@ func (grid *Grid) FillRandom() {
 func (grid *Grid) Dump() {
 	for y := 0; y < grid.Height; y++ {
 		for x := 0; x < grid.Width; x++ {
-			if grid.Data[y][x] == 1 {
+			if grid.Data[y][x] {
 				fmt.Print("XX")
 			} else {
 				fmt.Print("  ")
@@ -103,7 +103,7 @@ func (grid *Grid) LoadRLE(pattern *rle.RLE) {
 					x = colIndex + startX
 					y = rowIndex + startY
 
-					grid.Data[y][x] = 1
+					grid.Data[y][x] = true
 				}
 			}
 		}
@@ -213,12 +213,9 @@ func (grid *Grid) SaveState(filename, rule string) error {
 
 	for y := range grid.Data {
 		for _, cell := range grid.Data[y] {
-			row := ""
+			row := "."
-			switch cell {
+			if cell {
-			case 1:
+				row = "o"
-				row += "o"
-			case 0:
-				row += "."
 			}
 
 			_, err := file.WriteString(row)
@@ -233,12 +230,12 @@ func (grid *Grid) SaveState(filename, rule string) error {
 }
 
 // generate filenames for dumps
-func GetFilename(generations uint64) string {
+func GetFilename(generations int64) string {
 	now := time.Now()
 	return fmt.Sprintf("dump-%s-%d.lif", now.Format("20060102150405"), generations)
 }
 
-func GetFilenameRLE(generations uint64) string {
+func GetFilenameRLE(generations int64) string {
 	now := time.Now()
 	return fmt.Sprintf("rect-%s-%d.rle", now.Format("20060102150405"), generations)
 }

src/keybindings.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"image/color"
+
+	"github.com/ebitenui/ebitenui"
+	"github.com/ebitenui/ebitenui/widget"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type SceneKeybindings struct {
+	Game      *Game
+	Config    *Config
+	Next      SceneName
+	Prev      SceneName
+	Whoami    SceneName
+	Ui        *ebitenui.UI
+	FontColor color.RGBA
+	First     bool
+}
+
+func NewKeybindingsScene(game *Game, config *Config) Scene {
+	scene := &SceneKeybindings{
+		Whoami:    Keybindings,
+		Game:      game,
+		Next:      Keybindings,
+		Config:    config,
+		FontColor: color.RGBA{255, 30, 30, 0xff},
+	}
+
+	scene.Init()
+
+	return scene
+}
+
+func (scene *SceneKeybindings) GetNext() SceneName {
+	return scene.Next
+}
+
+func (scene *SceneKeybindings) SetPrevious(prev SceneName) {
+	scene.Prev = prev
+}
+
+func (scene *SceneKeybindings) ResetNext() {
+	scene.Next = scene.Whoami
+}
+
+func (scene *SceneKeybindings) SetNext(next SceneName) {
+	scene.Next = next
+}
+
+func (scene *SceneKeybindings) Update() error {
+	scene.Ui.Update()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) || inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		scene.Config.DelayedStart = false
+		scene.Leave()
+	}
+
+	return nil
+
+}
+
+func (scene *SceneKeybindings) IsPrimary() bool {
+	return false
+}
+
+func (scene *SceneKeybindings) Draw(screen *ebiten.Image) {
+	scene.Ui.Draw(screen)
+}
+
+func (scene *SceneKeybindings) Leave() {
+	scene.SetNext(Play)
+}
+
+func (scene *SceneKeybindings) Init() {
+	rowContainer := NewRowContainer("Key Bindings")
+
+	bindings := widget.NewText(
+		widget.TextOpts.WidgetOpts(widget.WidgetOpts.LayoutData(widget.RowLayoutData{
+			Stretch: true,
+		})),
+		widget.TextOpts.Text(KEYBINDINGS, *FontRenderer.FontSmall, color.NRGBA{0xdf, 0xf4, 0xff, 0xff}))
+
+	cancel := NewMenuButton("Back",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.Leave()
+		})
+
+	rowContainer.AddChild(bindings)
+	rowContainer.AddChild(cancel)
+
+	scene.Ui = &ebitenui.UI{
+		Container: rowContainer.Container(),
+	}
+
+}

src/menu.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"image/color"
 	"os"
 
@@ -101,9 +102,15 @@ func (scene *SceneMenu) Init() {
 
 	options := NewMenuButton("Options",
 		func(args *widget.ButtonClickedEventArgs) {
+			fmt.Println("menu => options")
 			scene.SetNext(Options)
 		})
 
+	bindings := NewMenuButton("Show Key Bindings",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.SetNext(Keybindings)
+		})
+
 	separator1 := NewSeparator(3)
 	separator2 := NewSeparator(3)
 	separator3 := NewSeparator(10)
@@ -123,6 +130,7 @@ func (scene *SceneMenu) Init() {
 	rowContainer.AddChild(separator1)
 	rowContainer.AddChild(options)
 	rowContainer.AddChild(copy)
+	rowContainer.AddChild(bindings)
 	rowContainer.AddChild(separator2)
 	rowContainer.AddChild(cancel)
 	rowContainer.AddChild(separator3)

src/options.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"fmt"
 	"image/color"
 
+	"github.com/alecthomas/repr"
 	"github.com/ebitenui/ebitenui"
 	"github.com/ebitenui/ebitenui/widget"
 	"github.com/hajimehoshi/ebiten/v2"
@@ -69,55 +71,69 @@ func (scene *SceneOptions) Draw(screen *ebiten.Image) {
 }
 
 func (scene *SceneOptions) SetInitialValue(w *widget.LabeledCheckbox, value bool) {
-	var intval int
 	if value {
-		intval = 1
-	}
-
 		w.SetState(
-		widget.WidgetState(intval),
+			widget.WidgetChecked,
 		)
 	}
+}
 
 func (scene *SceneOptions) Init() {
 	rowContainer := NewRowContainer("Options")
 
 	pause := NewCheckbox("Pause",
+		scene.Config.Paused,
 		func(args *widget.CheckboxChangedEventArgs) {
 			scene.Config.TogglePaused()
 		})
 
 	debugging := NewCheckbox("Debugging",
+		scene.Config.Debug,
 		func(args *widget.CheckboxChangedEventArgs) {
 			scene.Config.ToggleDebugging()
 		})
-	scene.SetInitialValue(debugging, scene.Config.Debug)
-
-	invert := NewCheckbox("Invert",
-		func(args *widget.CheckboxChangedEventArgs) {
-			scene.Config.ToggleInvert()
-		})
-	scene.SetInitialValue(invert, scene.Config.Invert)
 
 	gridlines := NewCheckbox("Show grid lines",
+		scene.Config.ShowGrid,
 		func(args *widget.CheckboxChangedEventArgs) {
+			fmt.Println("CHECKBOX CALLED")
+			repr.Println(args.State)
 			scene.Config.ToggleGridlines()
 		})
-	scene.SetInitialValue(gridlines, scene.Config.ShowGrid)
 
 	evolution := NewCheckbox("Show evolution traces",
+		scene.Config.ShowEvolution,
 		func(args *widget.CheckboxChangedEventArgs) {
 			scene.Config.ToggleEvolution()
 		})
-	scene.SetInitialValue(evolution, scene.Config.ShowEvolution)
 
 	wrap := NewCheckbox("Wrap around edges",
+		scene.Config.Wrap,
 		func(args *widget.CheckboxChangedEventArgs) {
 			scene.Config.ToggleWrap()
 		})
-	scene.SetInitialValue(wrap, scene.Config.Wrap)
+
+	themenames := make([]string, len(THEMES))
+	i := 0
+	for name := range THEMES {
+		themenames[i] = name
+		i++
+	}
+
+	themes := NewCombobox(
+		themenames,
+		scene.Config.Theme,
+		func(args *widget.ListComboButtonEntrySelectedEventArgs) {
+			scene.Config.SwitchTheme(args.Entry.(ListEntry).Name)
+		})
+
+	themelabel := NewLabel("Themes")
+	combocontainer := NewColumnContainer()
+	combocontainer.AddChild(themes)
+	combocontainer.AddChild(themelabel)
 
 	separator := NewSeparator(3)
+	separator2 := NewSeparator(3)
 
 	cancel := NewMenuButton("Close",
 		func(args *widget.ButtonClickedEventArgs) {
@@ -126,11 +142,16 @@ func (scene *SceneOptions) Init() {
 
 	rowContainer.AddChild(pause)
 	rowContainer.AddChild(debugging)
-	rowContainer.AddChild(invert)
 	rowContainer.AddChild(gridlines)
 	rowContainer.AddChild(evolution)
 	rowContainer.AddChild(wrap)
+
 	rowContainer.AddChild(separator)
+
+	rowContainer.AddChild(combocontainer)
+
+	rowContainer.AddChild(separator2)
+
 	rowContainer.AddChild(cancel)
 
 	scene.Ui = &ebitenui.UI{

src/play.go

@@ -3,9 +3,10 @@ package main
 import (
 	"fmt"
 	"image"
-	"image/color"
 	"log"
+	"unsafe"
 
+	uiinput "github.com/ebitenui/ebitenui/input"
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/hajimehoshi/ebiten/v2/vector"
@@ -18,7 +19,7 @@ type Images struct {
 }
 
 const (
-	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02f, Zoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s"
+	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02f, Zoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s, UI Active: %t"
 )
 
 type ScenePlay struct {
@@ -31,23 +32,21 @@ type ScenePlay struct {
 	Clear bool
 
 	Grids         []*Grid       // 2 grids: one current, one next
-	History                                    [][]uint64 // holds state of past dead cells for evolution traces
+	History       [][]int64     // holds state of past dead cells for evolution traces
 	Index         int           // points to current grid
-	Generations                                uint64     // Stats
+	Generations   int64         // Stats
-	Black, White, Grey, Old                    color.RGBA
-	AgeColor1, AgeColor2, AgeColor3, AgeColor4 color.RGBA
 	TicksElapsed  int           // tick counter for game speed
-	Tiles                                      Images        // pre-computed tiles for dead and alife cells
 	Camera        Camera        // for zoom+move
 	World, Cache  *ebiten.Image // actual image we render to
 	WheelTurned   bool          // when user turns wheel multiple times, zoom faster
 	Dragging      bool          // middle mouse is pressed, move canvas
-	LastCursorPos                              []int         // used to check if the user is dragging
+	LastCursorPos []float64     // used to check if the user is dragging
 	MarkTaken     bool          // true when mouse1 pressed
 	MarkDone      bool          // true when mouse1 released, copy cells between Mark+Point
 	Mark, Point   image.Point   // area to marks+save
 	RunOneStep    bool          // mutable flags from config
-	TPG                                        int
+	TPG           int           // current game speed (ticks per game)
+	Theme         Theme
 }
 
 func NewPlayScene(game *Game, config *Config) Scene {
@@ -85,8 +84,8 @@ func (scene *ScenePlay) SetNext(next SceneName) {
 	scene.Next = next
 }
 
-func (scene *ScenePlay) CheckRule(state uint8, neighbors uint8) uint8 {
+func (scene *ScenePlay) CheckRule(state bool, neighbors int) bool {
-	var nextstate uint8
+	var nextstate bool
 
 	// The standard Scene of Life is symbolized in rule-string notation
 	// as B3/S23 (23/3 here).  A cell  is born if it has exactly three
@@ -94,9 +93,9 @@ func (scene *ScenePlay) CheckRule(state uint8, neighbors uint8) uint8 {
 	// and  dies otherwise. The first  number, or list of  numbers, is
 	// what is required for a dead cell to be born.
 
-	if state == 0 && Contains(scene.Config.Rule.Birth, neighbors) {
+	if !state && Contains(scene.Config.Rule.Birth, neighbors) {
 		nextstate = Alive
-	} else if state == 1 && Contains(scene.Config.Rule.Death, neighbors) {
+	} else if state && Contains(scene.Config.Rule.Death, neighbors) {
 		nextstate = Alive
 	} else {
 		nextstate = Dead
@@ -130,13 +129,18 @@ func (scene *ScenePlay) UpdateCells() {
 			// change state of current cell in next grid
 			scene.Grids[next].Data[y][x] = nextstate
 
+			if scene.Config.ShowEvolution {
 				// set history  to current generation so we  can infer the
 				// age of the cell's state  during rendering and use it to
 				// deduce the color to use if evolution tracing is enabled
-			// FIXME: unbranch somehow
+				// 60FPS:
 				if state != nextstate {
 					scene.History[y][x] = scene.Generations
 				}
+
+				// 10FPS:
+				//scene.History.Data[y][x] = (state ^ (1 ^ nextstate)) * (scene.Generations - scene.History.Data[y][x])
+			}
 		}
 	}
 
@@ -181,6 +185,12 @@ func (scene *ScenePlay) CheckInput() {
 
 	if inpututil.IsKeyJustPressed(ebiten.KeyC) {
 		scene.Config.Markmode = true
+		scene.Config.Drawmode = false
+		scene.Config.Paused = true
+	}
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyI) {
+		scene.Config.Drawmode = true
 		scene.Config.Paused = true
 	}
 
@@ -192,16 +202,6 @@ func (scene *ScenePlay) CheckInput() {
 		scene.Config.TogglePaused()
 	}
 
-	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-		scene.ToggleCellOnCursorPos(Alive)
-		scene.Config.Paused = true // drawing while running makes no sense
-	}
-
-	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonRight) {
-		scene.ToggleCellOnCursorPos(Dead)
-		scene.Config.Paused = true // drawing while running makes no sense
-	}
-
 	if inpututil.IsKeyJustPressed(ebiten.KeyPageDown) {
 		if scene.TPG < 120 {
 			scene.TPG++
@@ -229,6 +229,22 @@ func (scene *ScenePlay) CheckInput() {
 	}
 }
 
+func (scene *ScenePlay) CheckDrawingInput() {
+	if scene.Config.Drawmode {
+		if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+			scene.ToggleCellOnCursorPos(Alive)
+		}
+
+		if ebiten.IsMouseButtonPressed(ebiten.MouseButtonRight) {
+			scene.ToggleCellOnCursorPos(Dead)
+		}
+
+		if inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
+			scene.Config.Drawmode = false
+		}
+	}
+}
+
 // Check dragging input.  move the canvas with the  mouse while pressing
 // the middle mouse button, zoom in and out using the wheel.
 func (scene *ScenePlay) CheckDraggingInput() {
@@ -236,20 +252,26 @@ func (scene *ScenePlay) CheckDraggingInput() {
 		return
 	}
 
+	dragbutton := ebiten.MouseButtonLeft
+
+	if scene.Config.Drawmode {
+		dragbutton = ebiten.MouseButtonMiddle
+	}
+
 	// move canvas
-	if scene.Dragging && !ebiten.IsMouseButtonPressed(ebiten.MouseButton1) {
+	if scene.Dragging && !ebiten.IsMouseButtonPressed(dragbutton) {
 		// release
 		scene.Dragging = false
 	}
 
-	if !scene.Dragging && ebiten.IsMouseButtonPressed(ebiten.MouseButton1) {
+	if !scene.Dragging && ebiten.IsMouseButtonPressed(dragbutton) {
 		// start dragging
 		scene.Dragging = true
-		scene.LastCursorPos[0], scene.LastCursorPos[1] = ebiten.CursorPosition()
+		scene.LastCursorPos[0], scene.LastCursorPos[1] = scene.Camera.ScreenToWorld(ebiten.CursorPosition())
 	}
 
 	if scene.Dragging {
-		x, y := ebiten.CursorPosition()
+		x, y := scene.Camera.ScreenToWorld(ebiten.CursorPosition())
 
 		if x != scene.LastCursorPos[0] || y != scene.LastCursorPos[1] {
 			// actually drag by mouse cursor pos diff to last cursor pos
@@ -257,7 +279,7 @@ func (scene *ScenePlay) CheckDraggingInput() {
 			scene.Camera.Position[1] -= float64(y - scene.LastCursorPos[1])
 		}
 
-		scene.LastCursorPos[0], scene.LastCursorPos[1] = ebiten.CursorPosition()
+		scene.LastCursorPos[0], scene.LastCursorPos[1] = scene.Camera.ScreenToWorld(ebiten.CursorPosition())
 	}
 
 	// also support the arrow keys to move the canvas
@@ -364,10 +386,10 @@ func (scene *ScenePlay) SaveRectRLE() {
 		height = scene.Mark.Y - scene.Point.Y
 	}
 
-	grid := make([][]uint8, height)
+	grid := make([][]bool, height)
 
 	for y := 0; y < height; y++ {
-		grid[y] = make([]uint8, width)
+		grid[y] = make([]bool, width)
 
 		for x := 0; x < width; x++ {
 			grid[y][x] = scene.Grids[scene.Index].Data[y+starty][x+startx]
@@ -394,7 +416,7 @@ func (scene *ScenePlay) Update() error {
 
 	if scene.Config.RestartCache {
 		scene.Config.RestartCache = false
-		scene.InitTiles()
+		scene.Theme = scene.Config.ThemeManager.GetCurrentTheme()
 		scene.InitCache()
 		return nil
 	}
@@ -403,10 +425,12 @@ func (scene *ScenePlay) Update() error {
 		return quit
 	}
 
+	if !uiinput.UIActive {
 		scene.CheckInput()
+		scene.CheckDrawingInput()
 		scene.CheckDraggingInput()
 		scene.CheckMarkInput()
-
+	}
 	if !scene.Config.Paused || scene.RunOneStep {
 		scene.UpdateCells()
 	}
@@ -415,14 +439,14 @@ func (scene *ScenePlay) Update() error {
 }
 
 // set a cell to alive or dead
-func (scene *ScenePlay) ToggleCellOnCursorPos(state uint8) {
+func (scene *ScenePlay) ToggleCellOnCursorPos(alive bool) {
 	// use cursor pos relative to the world
 	worldX, worldY := scene.Camera.ScreenToWorld(ebiten.CursorPosition())
 	x := int(worldX) / scene.Config.Cellsize
 	y := int(worldY) / scene.Config.Cellsize
 
 	if x > -1 && y > -1 && x < scene.Config.Width && y < scene.Config.Height {
-		scene.Grids[scene.Index].Data[y][x] = state
+		scene.Grids[scene.Index].Data[y][x] = alive
 		scene.History[y][x] = 1
 	}
 }
@@ -437,8 +461,6 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 	op.GeoM.Translate(0, 0)
 	scene.World.DrawImage(scene.Cache, op)
 
-	var age uint64
-
 	for y := 0; y < scene.Config.Height; y++ {
 		for x := 0; x < scene.Config.Width; x++ {
 			op.GeoM.Reset()
@@ -447,29 +469,11 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 				float64(y*scene.Config.Cellsize),
 			)
 
-			age = scene.Generations - scene.History[y][x]
+			if scene.Config.ShowEvolution {
-
+				scene.DrawEvolution(screen, x, y, op)
-			switch scene.Grids[scene.Index].Data[y][x] {
-			case Alive:
-				if age > 50 && scene.Config.ShowEvolution {
-					scene.World.DrawImage(scene.Tiles.Old, op)
-
 			} else {
-					scene.World.DrawImage(scene.Tiles.Black, op)
+				if scene.Grids[scene.Index].Data[y][x] {
-				}
+					scene.World.DrawImage(scene.Theme.Tile(ColLife), op)
-			case Dead:
-				// only draw dead cells in case evolution trace is enabled
-				if scene.History[y][x] > 1 && scene.Config.ShowEvolution {
-					switch {
-					case age < 10:
-						scene.World.DrawImage(scene.Tiles.Age1, op)
-					case age < 20:
-						scene.World.DrawImage(scene.Tiles.Age2, op)
-					case age < 30:
-						scene.World.DrawImage(scene.Tiles.Age3, op)
-					default:
-						scene.World.DrawImage(scene.Tiles.Age4, op)
-					}
 				}
 			}
 		}
@@ -481,10 +485,35 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 
 	scene.DrawDebug(screen)
 
-	op.GeoM.Reset()
+	// draw the toolbar directly from here, because otherwise it flickers
-	op.GeoM.Translate(0, 0)
+	scene.Game.Scenes[Toolbar].Draw(screen)
+}
 
-	scene.Game.Screen.DrawImage(screen, op)
+func (scene *ScenePlay) DrawEvolution(screen *ebiten.Image, x, y int, op *ebiten.DrawImageOptions) {
+	age := scene.Generations - scene.History[y][x]
+
+	switch scene.Grids[scene.Index].Data[y][x] {
+	case Alive:
+		if age > 50 && scene.Config.ShowEvolution {
+			scene.World.DrawImage(scene.Theme.Tile(ColOld), op)
+		} else {
+			scene.World.DrawImage(scene.Theme.Tile(ColLife), op)
+		}
+	case Dead:
+		// only draw dead cells in case evolution trace is enabled
+		if scene.History[y][x] > 1 && scene.Config.ShowEvolution {
+			switch {
+			case age < 10:
+				scene.World.DrawImage(scene.Theme.Tile(ColAge1), op)
+			case age < 20:
+				scene.World.DrawImage(scene.Theme.Tile(ColAge2), op)
+			case age < 30:
+				scene.World.DrawImage(scene.Theme.Tile(ColAge3), op)
+			default:
+				scene.World.DrawImage(scene.Theme.Tile(ColAge4), op)
+			}
+		}
+	}
 }
 
 func (scene *ScenePlay) DrawMark(screen *ebiten.Image) {
@@ -498,7 +527,7 @@ func (scene *ScenePlay) DrawMark(screen *ebiten.Image) {
 			scene.World,
 			x+1, y+1,
 			w, h,
-			1.0, scene.Old, false,
+			1.0, scene.Theme.Color(ColOld), false,
 		)
 	}
 }
@@ -514,6 +543,10 @@ func (scene *ScenePlay) DrawDebug(screen *ebiten.Image) {
 			paused = "-- mark --"
 		}
 
+		if scene.Config.Drawmode {
+			paused = "-- insert --"
+		}
+
 		x, y := ebiten.CursorPosition()
 		debug := fmt.Sprintf(
 			DEBUG_FORMAT,
@@ -521,15 +554,15 @@ func (scene *ScenePlay) DrawDebug(screen *ebiten.Image) {
 			scene.Game.Scale, scene.Camera.ZoomFactor,
 			scene.Camera.Position[0], scene.Camera.Position[1],
 			x, y,
-			paused)
+			paused, uiinput.UIActive)
 
 		FontRenderer.Renderer.SetSizePx(10 + int(scene.Game.Scale*10))
 		FontRenderer.Renderer.SetTarget(screen)
 
-		FontRenderer.Renderer.SetColor(scene.Black)
+		FontRenderer.Renderer.SetColor(scene.Theme.Color(ColLife))
 		FontRenderer.Renderer.Draw(debug, 31, 31)
 
-		FontRenderer.Renderer.SetColor(scene.Old)
+		FontRenderer.Renderer.SetColor(scene.Theme.Color(ColOld))
 		FontRenderer.Renderer.Draw(debug, 30, 30)
 
 		fmt.Println(debug)
@@ -547,9 +580,9 @@ func (scene *ScenePlay) InitCache() {
 	op := &ebiten.DrawImageOptions{}
 
 	if scene.Config.ShowGrid {
-		scene.Cache.Fill(scene.Grey)
+		scene.Cache.Fill(scene.Theme.Color(ColGrid))
 	} else {
-		scene.Cache.Fill(scene.White)
+		scene.Cache.Fill(scene.Theme.Color(ColDead))
 	}
 
 	for y := 0; y < scene.Config.Height; y++ {
@@ -560,7 +593,7 @@ func (scene *ScenePlay) InitCache() {
 				float64(y*scene.Config.Cellsize),
 			)
 
-			scene.Cache.DrawImage(scene.Tiles.White, op)
+			scene.Cache.DrawImage(scene.Theme.Tile(ColDead), op)
 		}
 	}
 }
@@ -569,64 +602,21 @@ func (scene *ScenePlay) InitCache() {
 func (scene *ScenePlay) InitGrid() {
 	grida := NewGrid(scene.Config.Width, scene.Config.Height, scene.Config.Density, scene.Config.Empty)
 	gridb := NewGrid(scene.Config.Width, scene.Config.Height, scene.Config.Density, scene.Config.Empty)
-	history := NewGrid(scene.Config.Width, scene.Config.Height, scene.Config.Density, scene.Config.Empty)
 
 	// startup is delayed until user has selected options
 	grida.FillRandom()
-	grida.Copy(history)
 
 	scene.Grids = []*Grid{
 		grida,
 		gridb,
 	}
 
-	scene.History = make([][]uint64, scene.Config.Height)
+	scene.History = make([][]int64, scene.Config.Height)
 	for y := 0; y < scene.Config.Height; y++ {
-		scene.History[y] = make([]uint64, scene.Config.Width)
+		scene.History[y] = make([]int64, scene.Config.Width)
 	}
 }
 
-// prepare tile images
-func (scene *ScenePlay) InitTiles() {
-	scene.Grey = color.RGBA{128, 128, 128, 0xff}
-	scene.Old = color.RGBA{255, 30, 30, 0xff}
-
-	scene.Black = color.RGBA{0, 0, 0, 0xff}
-	scene.White = color.RGBA{200, 200, 200, 0xff}
-	scene.AgeColor1 = color.RGBA{255, 195, 97, 0xff} // FIXME: use slice!
-	scene.AgeColor2 = color.RGBA{255, 211, 140, 0xff}
-	scene.AgeColor3 = color.RGBA{255, 227, 181, 0xff}
-	scene.AgeColor4 = color.RGBA{255, 240, 224, 0xff}
-
-	if scene.Config.Invert {
-		scene.White = color.RGBA{0, 0, 0, 0xff}
-		scene.Black = color.RGBA{200, 200, 200, 0xff}
-
-		scene.AgeColor1 = color.RGBA{82, 38, 0, 0xff}
-		scene.AgeColor2 = color.RGBA{66, 35, 0, 0xff}
-		scene.AgeColor3 = color.RGBA{43, 27, 0, 0xff}
-		scene.AgeColor4 = color.RGBA{25, 17, 0, 0xff}
-	}
-
-	scene.Tiles.Black = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.White = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.Old = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.Age1 = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.Age2 = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.Age3 = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-	scene.Tiles.Age4 = ebiten.NewImage(scene.Config.Cellsize, scene.Config.Cellsize)
-
-	cellsize := scene.Config.ScreenWidth / scene.Config.Cellsize
-
-	FillCell(scene.Tiles.Black, cellsize, scene.Black)
-	FillCell(scene.Tiles.White, cellsize, scene.White)
-	FillCell(scene.Tiles.Old, cellsize, scene.Old)
-	FillCell(scene.Tiles.Age1, cellsize, scene.AgeColor1)
-	FillCell(scene.Tiles.Age2, cellsize, scene.AgeColor2)
-	FillCell(scene.Tiles.Age3, cellsize, scene.AgeColor3)
-	FillCell(scene.Tiles.Age4, cellsize, scene.AgeColor4)
-}
-
 func (scene *ScenePlay) Init() {
 	// setup the scene
 	scene.Camera = Camera{
@@ -652,7 +642,7 @@ func (scene *ScenePlay) Init() {
 		scene.Config.Height*scene.Config.Cellsize,
 	)
 
-	scene.InitTiles()
+	scene.Theme = scene.Config.ThemeManager.GetCurrentTheme()
 	scene.InitCache()
 
 	if scene.Config.DelayedStart && !scene.Config.Empty {
@@ -668,7 +658,7 @@ func (scene *ScenePlay) Init() {
 	scene.Index = 0
 	scene.TicksElapsed = 0
 
-	scene.LastCursorPos = make([]int, 2)
+	scene.LastCursorPos = make([]float64, 2)
 
 	if scene.Config.Zoomfactor < 0 || scene.Config.Zoomfactor > 0 {
 		scene.Camera.ZoomFactor = scene.Config.Zoomfactor
@@ -677,9 +667,15 @@ func (scene *ScenePlay) Init() {
 	scene.Camera.Setup()
 }
 
+func bool2int(b bool) int {
+	return int(*(*byte)(unsafe.Pointer(&b)))
+}
+
 // count the living neighbors of a cell
-func (scene *ScenePlay) CountNeighbors(x, y int) uint8 {
+func (scene *ScenePlay) CountNeighbors(x, y int) int {
-	var sum uint8
+	var sum int
+
+	grid := scene.Grids[scene.Index].Data
 
 	for nbgX := -1; nbgX < 2; nbgX++ {
 		for nbgY := -1; nbgY < 2; nbgY++ {
@@ -701,24 +697,12 @@ func (scene *ScenePlay) CountNeighbors(x, y int) uint8 {
 				row = y + nbgY
 			}
 
-			sum += scene.Grids[scene.Index].Data[row][col]
+			sum += bool2int(grid[row][col])
 		}
 	}
 
 	// don't count ourselfes though
-	sum -= scene.Grids[scene.Index].Data[y][x]
+	sum -= bool2int(grid[y][x])
 
 	return sum
 }
-
-// fill a cell with the given color
-func FillCell(tile *ebiten.Image, cellsize int, col color.RGBA) {
-	vector.DrawFilledRect(
-		tile,
-		float32(1),
-		float32(1),
-		float32(cellsize),
-		float32(cellsize),
-		col, false,
-	)
-}

src/rule.go

@@ -9,22 +9,22 @@ import (
 // a GOL rule
 type Rule struct {
 	Definition string
-	Birth      []uint8
+	Birth      []int
-	Death      []uint8
+	Death      []int
 }
 
 // parse one part of a GOL rule into rule slice
-func NumbersToList(numbers string) []uint8 {
+func NumbersToList(numbers string) []int {
-	list := []uint8{}
+	list := []int{}
 
 	items := strings.Split(numbers, "")
 	for _, item := range items {
-		num, err := strconv.ParseInt(item, 10, 8)
+		num, err := strconv.Atoi(item)
 		if err != nil {
 			log.Fatalf("failed to parse game rule part <%s>: %s", numbers, err)
 		}
 
-		list = append(list, uint8(num))
+		list = append(list, num)
 	}
 
 	return list

src/scene.go

@@ -24,4 +24,6 @@ const (
 	Menu = iota // main top level menu
 	Play        // actual playing happens here
 	Options
+	Keybindings
+	Toolbar
 )

src/theme.go

@@ -0,0 +1,175 @@
+package main
+
+import (
+	"fmt"
+	"image/color"
+	"log"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+// Color definitions. ColLife could be black or white depending on theme
+const (
+	ColLife = iota
+	ColDead
+	ColOld
+	ColAge1
+	ColAge2
+	ColAge3
+	ColAge4
+	ColGrid
+)
+
+// A Theme defines  how the grid and the cells  are colored. We define
+// the  colors and  the  actual tile  images here,  so  that they  are
+// readily available from play.go
+type Theme struct {
+	Tiles  map[int]*ebiten.Image
+	Colors map[int]color.RGBA
+	Name   string
+}
+
+type ThemeDef struct {
+	life, dead, grid, old, age1, age2, age3, age4 string
+}
+
+var THEMES = map[string]ThemeDef{
+	"standard": {
+		life: "e15f0b",
+		dead: "5a5a5a",
+		grid: "808080",
+		old:  "7b5e4b",
+		age1: "735f52",
+		age2: "6c6059",
+		age3: "635d59",
+		age4: "808080",
+	},
+	"dark": {
+		life: "c8c8c8",
+		dead: "000000",
+		old:  "ff1e1e",
+		age1: "522600",
+		age2: "422300",
+		age3: "2b1b00",
+		age4: "191100",
+		grid: "808080",
+	},
+	"light": {
+		life: "000000",
+		dead: "c8c8c8",
+		old:  "ff1e1e",
+		age1: "ffc361",
+		age2: "ffd38c",
+		age3: "ffe3b5",
+		age4: "fff0e0",
+		grid: "808080",
+	},
+}
+
+// create a new theme
+func NewTheme(def ThemeDef, cellsize int, name string) Theme {
+	theme := Theme{
+		Name: name,
+		Colors: map[int]color.RGBA{
+			ColLife: HexColor2RGBA(def.life),
+			ColDead: HexColor2RGBA(def.dead),
+			ColGrid: HexColor2RGBA(def.grid),
+			ColAge1: HexColor2RGBA(def.age1),
+			ColAge2: HexColor2RGBA(def.age2),
+			ColAge3: HexColor2RGBA(def.age3),
+			ColAge4: HexColor2RGBA(def.age4),
+			ColOld:  HexColor2RGBA(def.old),
+		},
+	}
+
+	theme.Tiles = make(map[int]*ebiten.Image, 6)
+
+	for cid, col := range theme.Colors {
+		theme.Tiles[cid] = ebiten.NewImage(cellsize, cellsize)
+		FillCell(theme.Tiles[cid], cellsize, col)
+	}
+
+	return theme
+}
+
+// return  the tile  image  for  the requested  color  type. panic  if
+// unknown type is being used, which is ok, since the code is the only
+// user anyway
+func (theme *Theme) Tile(col int) *ebiten.Image {
+	return theme.Tiles[col]
+}
+
+func (theme *Theme) Color(col int) color.RGBA {
+	return theme.Colors[col]
+}
+
+type ThemeManager struct {
+	Theme  string
+	Themes map[string]Theme
+}
+
+// Manager is used to easily switch themes from cli or menu
+func NewThemeManager(initial string, cellsize int) ThemeManager {
+	manager := ThemeManager{
+		Theme: initial,
+	}
+
+	manager.Themes = make(map[string]Theme, len(THEMES))
+
+	for name, def := range THEMES {
+		manager.Themes[name] = NewTheme(def, cellsize, name)
+	}
+
+	return manager
+}
+
+func (manager *ThemeManager) GetCurrentTheme() Theme {
+	return manager.Themes[manager.Theme]
+}
+
+func (manager *ThemeManager) GetCurrentThemeName() string {
+	return manager.Theme
+}
+
+func (manager *ThemeManager) SetCurrentTheme(theme string) {
+	if Exists(manager.Themes, theme) {
+		manager.Theme = theme
+	}
+}
+
+// Fill a cell with the given color.
+//
+// We do not  draw the cell at  0,0 of it's position but  at 1,1. This
+// creates a top and lef  transparent. By using a different background
+// for the whole grid we can then  decide wether to show grid lines or
+// not.
+//
+// If no  gridlines are  selected the background  will just  be filled
+// with the DEAD  color. However, IF we are to  show the gridlines, we
+// fill it  with a lighter color.  The transparent edges of  all tiles
+// then create the grid.
+//
+// So we don't draw a grid, we just left a grid behind, which saves us
+// from a lot of drawing operations.
+func FillCell(tile *ebiten.Image, cellsize int, col color.RGBA) {
+	vector.DrawFilledRect(
+		tile,
+		float32(1),
+		float32(1),
+		float32(cellsize),
+		float32(cellsize),
+		col, false,
+	)
+}
+
+func HexColor2RGBA(hex string) color.RGBA {
+	var r, g, b uint8
+
+	_, err := fmt.Sscanf(hex, "%02x%02x%02x", &r, &g, &b)
+	if err != nil {
+		log.Fatalf("failed to parse hex color: %s", err)
+	}
+
+	return color.RGBA{r, g, b, 255}
+}

src/toolbar.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"fmt"
+	"image/color"
+
+	"github.com/ebitenui/ebitenui"
+	"github.com/ebitenui/ebitenui/widget"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type SceneToolbar struct {
+	Game      *Game
+	Config    *Config
+	Next      SceneName
+	Prev      SceneName
+	Whoami    SceneName
+	Ui        *ebitenui.UI
+	FontColor color.RGBA
+}
+
+func NewToolbarScene(game *Game, config *Config) Scene {
+	scene := &SceneToolbar{
+		Whoami:    Toolbar,
+		Game:      game,
+		Next:      Toolbar,
+		Config:    config,
+		FontColor: color.RGBA{255, 30, 30, 0xff},
+	}
+
+	scene.Init()
+
+	return scene
+}
+
+func (scene *SceneToolbar) GetNext() SceneName {
+	return scene.Next
+}
+
+func (scene *SceneToolbar) SetPrevious(prev SceneName) {
+	scene.Prev = prev
+}
+
+func (scene *SceneToolbar) ResetNext() {
+	scene.Next = scene.Whoami
+}
+
+func (scene *SceneToolbar) SetNext(next SceneName) {
+	scene.Next = next
+}
+
+func (scene *SceneToolbar) IsPrimary() bool {
+	return true
+}
+
+func (scene *SceneToolbar) Update() error {
+	scene.Ui.Update()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) || inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		scene.SetNext(Play)
+	}
+
+	return nil
+
+}
+
+func (scene *SceneToolbar) Draw(screen *ebiten.Image) {
+	scene.Ui.Draw(screen)
+}
+
+func (scene *SceneToolbar) SetInitialValue(w *widget.LabeledCheckbox, value bool) {
+	if value {
+		w.SetState(
+			widget.WidgetChecked,
+		)
+	}
+}
+
+func (scene *SceneToolbar) Init() {
+	rowContainer := NewTopRowContainer("Toolbar")
+
+	options := NewToolbarButton(Assets["options"],
+		func(args *widget.ButtonClickedEventArgs) {
+			fmt.Println("options")
+			scene.SetNext(Options)
+		})
+
+	rowContainer.AddChild(options)
+
+	scene.Ui = &ebitenui.UI{
+		Container: rowContainer.Container(),
+	}
+
+}

src/widgets.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/ebitenui/ebitenui/image"
 	"github.com/ebitenui/ebitenui/widget"
+	"github.com/hajimehoshi/ebiten/v2"
 )
 
 func NewMenuButton(
@@ -40,13 +41,45 @@ func NewMenuButton(
 	)
 }
 
+func NewToolbarButton(
+	icon *ebiten.Image,
+	action func(args *widget.ButtonClickedEventArgs)) *widget.Container {
+
+	buttonImage, _ := LoadButtonImage()
+
+	iconContainer := widget.NewContainer(
+		widget.ContainerOpts.Layout(widget.NewStackedLayout()),
+		widget.ContainerOpts.WidgetOpts(widget.WidgetOpts.LayoutData(widget.AnchorLayoutData{
+			HorizontalPosition: widget.AnchorLayoutPositionCenter,
+			VerticalPosition:   widget.AnchorLayoutPositionCenter,
+		})),
+	)
+
+	button := widget.NewButton(
+		widget.ButtonOpts.Image(buttonImage),
+		widget.ButtonOpts.ClickedHandler(action),
+	)
+
+	iconContainer.AddChild(button)
+
+	iconContainer.AddChild(widget.NewGraphic(widget.GraphicOpts.Image(icon)))
+
+	return iconContainer
+}
+
 func NewCheckbox(
 	text string,
+	initialvalue bool,
 	action func(args *widget.CheckboxChangedEventArgs)) *widget.LabeledCheckbox {
 
 	checkboxImage, _ := LoadCheckboxImage()
 	buttonImage, _ := LoadButtonImage()
 
+	var state widget.WidgetState
+	if initialvalue {
+		state = widget.WidgetChecked
+	}
+
 	return widget.NewLabeledCheckbox(
 		widget.LabeledCheckboxOpts.CheckboxOpts(
 			widget.CheckboxOpts.ButtonOpts(
@@ -54,6 +87,7 @@ func NewCheckbox(
 			),
 			widget.CheckboxOpts.Image(checkboxImage),
 			widget.CheckboxOpts.StateChangedHandler(action),
+			widget.CheckboxOpts.InitialState(state),
 		),
 		widget.LabeledCheckboxOpts.LabelOpts(
 			widget.LabelOpts.Text(text, *FontRenderer.FontSmall,
@@ -78,6 +112,123 @@ func NewSeparator(padding int) widget.PreferredSizeLocateableWidget {
 	return c
 }
 
+type ListEntry struct {
+	id   int
+	Name string
+}
+
+func NewCombobox(items []string, selected string,
+	action func(args *widget.ListComboButtonEntrySelectedEventArgs)) *widget.ListComboButton {
+	buttonImage, _ := LoadButtonImage()
+
+	entries := make([]any, 0, len(items))
+	idxselected := 0
+	for i, item := range items {
+		entries = append(entries, ListEntry{i, item})
+		if items[i] == selected {
+			idxselected = i
+		}
+	}
+
+	comboBox := widget.NewListComboButton(
+		widget.ListComboButtonOpts.SelectComboButtonOpts(
+			widget.SelectComboButtonOpts.ComboButtonOpts(
+				//Set the max height of the dropdown list
+				widget.ComboButtonOpts.MaxContentHeight(150),
+				//Set the parameters for the primary displayed button
+				widget.ComboButtonOpts.ButtonOpts(
+					widget.ButtonOpts.Image(buttonImage),
+					widget.ButtonOpts.TextPadding(widget.NewInsetsSimple(5)),
+					widget.ButtonOpts.Text("", *FontRenderer.FontSmall, &widget.ButtonTextColor{
+						Idle:     color.White,
+						Disabled: color.White,
+					}),
+					widget.ButtonOpts.WidgetOpts(
+						//Set how wide the button should be
+						widget.WidgetOpts.MinSize(50, 0),
+						//Set the combobox's position
+						widget.WidgetOpts.LayoutData(widget.AnchorLayoutData{
+							HorizontalPosition: widget.AnchorLayoutPositionCenter,
+							VerticalPosition:   widget.AnchorLayoutPositionCenter,
+						})),
+				),
+			),
+		),
+		widget.ListComboButtonOpts.ListOpts(
+			//Set how wide the dropdown list should be
+			widget.ListOpts.ContainerOpts(
+				widget.ContainerOpts.WidgetOpts(widget.WidgetOpts.MinSize(50, 0)),
+			),
+			//Set the entries in the list
+			widget.ListOpts.Entries(entries),
+			widget.ListOpts.ScrollContainerOpts(
+				//Set the background images/color for the dropdown list
+				widget.ScrollContainerOpts.Image(&widget.ScrollContainerImage{
+					Idle:     image.NewNineSliceColor(color.NRGBA{100, 100, 100, 255}),
+					Disabled: image.NewNineSliceColor(color.NRGBA{100, 100, 100, 255}),
+					Mask:     image.NewNineSliceColor(color.NRGBA{100, 100, 100, 255}),
+				}),
+			),
+			widget.ListOpts.SliderOpts(
+				//Set the background images/color for the background of the slider track
+				widget.SliderOpts.Images(&widget.SliderTrackImage{
+					Idle:  image.NewNineSliceColor(color.NRGBA{100, 100, 100, 255}),
+					Hover: image.NewNineSliceColor(color.NRGBA{100, 100, 100, 255}),
+				}, buttonImage),
+				widget.SliderOpts.MinHandleSize(5),
+				//Set how wide the track should be
+				widget.SliderOpts.TrackPadding(widget.NewInsetsSimple(2))),
+			//Set the font for the list options
+			widget.ListOpts.EntryFontFace(*FontRenderer.FontSmall),
+			//Set the colors for the list
+			widget.ListOpts.EntryColor(&widget.ListEntryColor{
+				Selected:                   color.NRGBA{254, 255, 255, 255},
+				Unselected:                 color.NRGBA{254, 255, 255, 255},
+				SelectedBackground:         HexColor2RGBA(THEMES["standard"].life),
+				SelectedFocusedBackground:  HexColor2RGBA(THEMES["standard"].old),
+				FocusedBackground:          HexColor2RGBA(THEMES["standard"].old),
+				DisabledUnselected:         HexColor2RGBA(THEMES["standard"].grid),
+				DisabledSelected:           HexColor2RGBA(THEMES["standard"].grid),
+				DisabledSelectedBackground: HexColor2RGBA(THEMES["standard"].grid),
+			}),
+			//Padding for each entry
+			widget.ListOpts.EntryTextPadding(widget.NewInsetsSimple(5)),
+		),
+		//Define how the entry is displayed
+		widget.ListComboButtonOpts.EntryLabelFunc(
+			func(e any) string {
+				//Button Label function, visible if not open
+				return e.(ListEntry).Name
+			},
+			func(e any) string {
+				//List Label function, visible items if open
+				return e.(ListEntry).Name
+			}),
+		//Callback when a new entry is selected
+		widget.ListComboButtonOpts.EntrySelectedHandler(action),
+	)
+
+	//Select the middle entry -- optional
+	comboBox.SetSelectedEntry(entries[idxselected])
+
+	return comboBox
+}
+
+func NewLabel(text string) *widget.Text {
+	return widget.NewText(
+		widget.TextOpts.Text(text, *FontRenderer.FontSmall, color.White),
+		widget.TextOpts.Position(widget.TextPositionCenter, widget.TextPositionCenter),
+		widget.TextOpts.WidgetOpts(
+			widget.WidgetOpts.LayoutData(widget.RowLayoutData{
+				Position: widget.RowLayoutPositionCenter,
+			}),
+		),
+	)
+
+}
+
+/////////////// containers
+
 type RowContainer struct {
 	Root *widget.Container
 	Row  *widget.Container
@@ -91,6 +242,37 @@ func (container *RowContainer) Container() *widget.Container {
 	return container.Root
 }
 
+// setup a top level toolbar container
+func NewTopRowContainer(title string) *RowContainer {
+	buttonImageHover := image.NewNineSlice(Assets["button-9slice3"], [3]int{3, 3, 3}, [3]int{3, 3, 3})
+
+	uiContainer := widget.NewContainer(
+		widget.ContainerOpts.Layout(widget.NewAnchorLayout()),
+	)
+
+	rowContainer := widget.NewContainer(
+		widget.ContainerOpts.WidgetOpts(
+			widget.WidgetOpts.LayoutData(widget.AnchorLayoutData{
+				HorizontalPosition: widget.AnchorLayoutPositionStart,
+				VerticalPosition:   widget.AnchorLayoutPositionStart,
+			}),
+		),
+		widget.ContainerOpts.Layout(widget.NewRowLayout(
+			widget.RowLayoutOpts.Direction(widget.DirectionVertical),
+			widget.RowLayoutOpts.Padding(widget.NewInsetsSimple(8)),
+			widget.RowLayoutOpts.Spacing(0),
+		)),
+		widget.ContainerOpts.BackgroundImage(buttonImageHover),
+	)
+
+	uiContainer.AddChild(rowContainer)
+
+	return &RowContainer{
+		Root: uiContainer,
+		Row:  rowContainer,
+	}
+}
+
 // set arg to false if no background needed
 func NewRowContainer(title string) *RowContainer {
 	buttonImageHover := image.NewNineSlice(Assets["button-9slice3"], [3]int{3, 3, 3}, [3]int{3, 3, 3})
@@ -130,6 +312,19 @@ func NewRowContainer(title string) *RowContainer {
 	}
 }
 
+func NewColumnContainer() *widget.Container {
+	colcontainer := widget.NewContainer(
+		widget.ContainerOpts.Layout(
+			widget.NewGridLayout(
+				widget.GridLayoutOpts.Columns(2),
+				widget.GridLayoutOpts.Spacing(5, 0),
+			),
+		),
+	)
+
+	return colcontainer
+}
+
 func LoadButtonImage() (*widget.ButtonImage, error) {
 	idle := image.NewNineSlice(Assets["button-9slice2"], [3]int{3, 3, 3}, [3]int{3, 3, 3})
 	hover := image.NewNineSlice(Assets["button-9slice3"], [3]int{3, 3, 3}, [3]int{3, 3, 3})
@@ -142,6 +337,13 @@ func LoadButtonImage() (*widget.ButtonImage, error) {
 	}, nil
 }
 
+func LoadComboLabelImage() *widget.ButtonImageImage {
+	return &widget.ButtonImageImage{
+		Idle:     Assets["checkbox-9slice2"],
+		Disabled: Assets["checkbox-9slice2"],
+	}
+}
+
 func LoadCheckboxImage() (*widget.CheckboxGraphicImage, error) {
 	unchecked := &widget.ButtonImageImage{
 		Idle:     Assets["checkbox-9slice2"],

various-tests/README.md

@@ -0,0 +1,9 @@
+## Various performance tests
+
+Running with 1500x1500 grid 5k times
+
+| Variation          | Description                                                                 | Duration |
+|--------------------|-----------------------------------------------------------------------------|----------|
+| perf-2dim          | uses 2d grid of bools, no tuning                                            | 00:03:14 |
+| perf-2dim-pointers | use 2d grid of `Cell{Neighbors,NeighborCount}`s using pointers to neighbors | 00:03:35 |
+| perf-1dim          | use 1d grid of bools, access using y*x, no further tuning                   | 00:03:24 |

various-tests/perf-1dim/go.mod

@@ -0,0 +1,3 @@
+module perf
+
+go 1.22

various-tests/perf-1dim/main.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"runtime/pprof"
+	"unsafe"
+)
+
+const (
+	dim     int  = 1500
+	loops   int  = 5000
+	density int  = 8
+	debug   bool = false
+)
+
+var max int
+
+// https://dev.to/chigbeef_77/bool-int-but-stupid-in-go-3jb3
+func bool2int(b bool) int {
+	return int(*(*byte)(unsafe.Pointer(&b)))
+}
+
+func Count(grid []bool, x, y int) int {
+	var sum int
+
+	for nbgX := -1; nbgX < 2; nbgX++ {
+		for nbgY := -1; nbgY < 2; nbgY++ {
+			var col, row int
+
+			if x+nbgX < 0 || x+nbgX >= dim || y+nbgY < 0 || y+nbgY >= dim {
+				continue
+			}
+
+			col = x + nbgX
+			row = y + nbgY
+
+			state := grid[row*col]
+			intstate := bool2int(state)
+			sum += intstate
+		}
+	}
+
+	sum -= bool2int(grid[y*x])
+
+	return sum
+}
+
+func Init() []bool {
+	max = dim * dim
+
+	grid := make([]bool, max)
+
+	for y := 0; y < dim; y++ {
+		for x := 0; x < dim; x++ {
+			if rand.Intn(density) == 1 {
+				grid[y*x] = true
+			}
+		}
+	}
+
+	return grid
+}
+
+func Loop(grid []bool) {
+	c := 0
+	for i := 0; i < loops; i++ {
+		for y := 0; y < dim; y++ {
+			for x := 0; x < dim; x++ {
+				state := grid[y*x]
+				neighbors := Count(grid, x, y)
+				if state && neighbors > 1 {
+					if debug {
+						fmt.Printf("Loop %d - cell at %d,%d is %t and has %d living neighbors\n", i, x, y, state, neighbors)
+					}
+					c = 1
+				}
+			}
+		}
+	}
+
+	if c > 1 {
+		c = 0
+	}
+}
+
+func main() {
+	// enable  cpu profiling. Do  NOT use q  to stop the  game but
+	// close the window to get a profile
+	fd, err := os.Create("cpu.profile")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fd.Close()
+
+	pprof.StartCPUProfile(fd)
+	defer pprof.StopCPUProfile()
+
+	// init
+	grid := Init()
+
+	// main loop
+	Loop(grid)
+}

various-tests/perf-2dim-pointers/go.mod

@@ -0,0 +1,3 @@
+module perf
+
+go 1.22

various-tests/perf-2dim-pointers/main.go

@@ -0,0 +1,137 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"runtime/pprof"
+	"time"
+	"unsafe"
+)
+
+const (
+	max     int  = 1500
+	loops   int  = 5000
+	density int  = 8
+	debug   bool = false
+)
+
+type Cell struct {
+	State         bool
+	Neighbors     []*Cell
+	NeighborCount int
+}
+
+// https://dev.to/chigbeef_77/bool-int-but-stupid-in-go-3jb3
+func bool2int(b bool) int {
+	return int(*(*byte)(unsafe.Pointer(&b)))
+}
+
+func (cell *Cell) Count(x, y int) {
+	cell.NeighborCount = 0
+
+	for _, neighbor := range cell.Neighbors {
+		cell.NeighborCount += bool2int(neighbor.State)
+	}
+}
+
+func SetNeighbors(grid [][]Cell, x, y int) {
+	cells := []*Cell{}
+
+	for nbgX := -1; nbgX < 2; nbgX++ {
+		for nbgY := -1; nbgY < 2; nbgY++ {
+			var col, row int
+
+			if x+nbgX < 0 || x+nbgX >= max || y+nbgY < 0 || y+nbgY >= max {
+				continue
+			}
+
+			col = x + nbgX
+			row = y + nbgY
+
+			if col == x && row == y {
+				continue
+			}
+
+			cells = append(cells, &grid[row][col])
+		}
+	}
+
+	grid[y][x].Neighbors = make([]*Cell, len(cells))
+	for idx, cell := range cells {
+		grid[y][x].Neighbors[idx] = cell
+	}
+}
+
+func Init() [][]Cell {
+	grid := make([][]Cell, max)
+	for y := 0; y < max; y++ {
+		grid[y] = make([]Cell, max)
+		for x := 0; x < max; x++ {
+			if rand.Intn(density) == 1 {
+				grid[y][x].State = true
+			}
+		}
+	}
+
+	for y := 0; y < max; y++ {
+		for x := 0; x < max; x++ {
+			SetNeighbors(grid, x, y)
+		}
+	}
+
+	return grid
+}
+
+func Loop(grid [][]Cell) {
+	c := 0
+	for i := 0; i < loops; i++ {
+		for y := 0; y < max; y++ {
+			for x := 0; x < max; x++ {
+				cell := &grid[y][x]
+				state := cell.State
+
+				cell.Count(x, y)
+
+				if state && cell.NeighborCount > 1 {
+					if debug {
+						fmt.Printf(
+							"Loop %d - cell at %d,%d is %t and has %d living neighbors\n",
+							i, x, y, state, cell.NeighborCount)
+					}
+					c = 1
+				}
+			}
+		}
+	}
+
+	if c > 1 {
+		c = 0
+	}
+}
+
+func main() {
+	// enable  cpu profiling. Do  NOT use q  to stop the  game but
+	// close the window to get a profile
+	fd, err := os.Create("cpu.profile")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fd.Close()
+
+	pprof.StartCPUProfile(fd)
+	defer pprof.StopCPUProfile()
+
+	// init
+	grid := Init()
+
+	// main loop
+	loopstart := time.Now()
+
+	Loop(grid)
+
+	loopend := time.Now()
+	diff := loopstart.Sub(loopend)
+	fmt.Printf("Loop took %.04f\n", diff.Seconds())
+}

various-tests/perf-2dim/go.mod

@@ -0,0 +1,3 @@
+module perf
+
+go 1.22

various-tests/perf-2dim/main.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"runtime/pprof"
+	"unsafe"
+)
+
+const (
+	max     int  = 1500
+	loops   int  = 5000
+	density int  = 8
+	debug   bool = false
+)
+
+// https://dev.to/chigbeef_77/bool-int-but-stupid-in-go-3jb3
+func bool2int(b bool) int {
+	return int(*(*byte)(unsafe.Pointer(&b)))
+}
+
+func Count(grid [][]bool, x, y int) int {
+	var sum int
+
+	for nbgX := -1; nbgX < 2; nbgX++ {
+		for nbgY := -1; nbgY < 2; nbgY++ {
+			var col, row int
+
+			if x+nbgX < 0 || x+nbgX >= max || y+nbgY < 0 || y+nbgY >= max {
+				continue
+			}
+
+			col = x + nbgX
+			row = y + nbgY
+
+			state := grid[row][col]
+			intstate := bool2int(state)
+			sum += intstate
+		}
+	}
+
+	sum -= bool2int(grid[y][x])
+
+	return sum
+}
+
+func Init() [][]bool {
+	grid := make([][]bool, max)
+	for y := 0; y < max; y++ {
+		grid[y] = make([]bool, max)
+		for x := 0; x < max; x++ {
+			if rand.Intn(density) == 1 {
+				grid[y][x] = true
+			}
+		}
+	}
+
+	return grid
+}
+
+func Loop(grid [][]bool) {
+	c := 0
+	for i := 0; i < loops; i++ {
+		for y := 0; y < max; y++ {
+			for x := 0; x < max; x++ {
+				state := grid[y][x]
+				neighbors := Count(grid, x, y)
+				if state && neighbors > 1 {
+					if debug {
+						fmt.Printf("Loop %d - cell at %d,%d is %t and has %d living neighbors\n", i, x, y, state, neighbors)
+					}
+					c = 1
+				}
+			}
+		}
+	}
+
+	if c > 1 {
+		c = 0
+	}
+}
+
+func main() {
+	// enable  cpu profiling. Do  NOT use q  to stop the  game but
+	// close the window to get a profile
+	fd, err := os.Create("cpu.profile")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fd.Close()
+
+	pprof.StartCPUProfile(fd)
+	defer pprof.StopCPUProfile()
+
+	// init
+	grid := Init()
+
+	// main loop
+	Loop(grid)
+}

various-tests/writepixel/main.go

@@ -238,13 +238,30 @@ func (game *Game) Draw(screen *ebiten.Image) {
 }
 
 func main() {
-	// state := 1
+	//x := 1
-	// nextstate := 0
+	//y := 0
-	v := 0
+	col := 1 >> 0xff
 
-	for i := 0; i < 600; i++ {
+	fmt.Printf("col: %d\n", col)
-		v = ((v + 1) & 255)
+
-		fmt.Println(i, i&255)
+	x := 1
+	y := 2
+	c := 4
+
+	xm := x & (c - 1)
+	ym := y & (c - 1)
+
+	fmt.Println(xm & ym)
+
+	a := 1
+	b := 1
+	//gen := 100
+	hist := 0
+	for gen := 0; gen < 50; gen++ {
+		fmt.Println((a ^ (1 ^ b)) * (gen - hist))
+		if gen == 25 {
+			a = 0
+		}
 	}
 }