int64 => uint8

- renamed scene files
- fixed options back using scene.Prev
- fixed initial zooming (finally)
- fixed reset zoom (key r)
- fixed initial size, now works with state loading as well

.gitignore

@@ -3,3 +3,6 @@ bak
 dump*
 rect*
 *profile
+*prof
+*lif
+*rle

Makefile

@@ -1,96 +1,4 @@
-# Copyright © 2024 Thomas von Dein
+.PHONY: all
-
+all:
-# This program is free software: you can redistribute it and/or modify
+	make -C src
-# it under the terms of the GNU General Public License as published by
+	mv src/golsky .
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-
-#
-# no need to modify anything below
-tool      = golsky
-VERSION   = $(shell grep VERSION main.go | head -1 | cut -d '"' -f2)
-archs     = darwin freebsd linux windows
-PREFIX    = /usr/local
-UID       = root
-GID       = 0
-HAVE_POD := $(shell pod2text -h 2>/dev/null)
-
-all: buildlocal
-
-
-buildlocal:
-	go build -o $(tool)
-
-install: buildlocal
-	install -d -o $(UID) -g $(GID) $(PREFIX)/bin
-	install -d -o $(UID) -g $(GID) $(PREFIX)/man/man1
-	install -o $(UID) -g $(GID) -m 555 $(tool)  $(PREFIX)/sbin/
-	install -o $(UID) -g $(GID) -m 444 $(tool).1 $(PREFIX)/man/man1/
-
-clean:
-	rm -rf $(tool) coverage.out testdata t/out
-
-test: clean
-	mkdir -p t/out
-	go test ./... $(ARGS)
-
-testlint: test lint
-
-lint:
-	golangci-lint run
-
-lint-full:
-	golangci-lint run --enable-all --exclude-use-default --disable exhaustivestruct,exhaustruct,depguard,interfacer,deadcode,golint,structcheck,scopelint,varcheck,ifshort,maligned,nosnakecase,godot,funlen,gofumpt,cyclop,noctx,gochecknoglobals,paralleltest
-
-testfuzzy: clean
-	go test -fuzz ./... $(ARGS)
-
-singletest:
-	@echo "Call like this: make singletest TEST=TestPrepareColumns ARGS=-v"
-	go test -run $(TEST) $(ARGS)
-
-cover-report:
-	go test ./... -cover -coverprofile=coverage.out
-	go tool cover -html=coverage.out
-
-goupdate:
-	go get -t -u=patch ./...
-
-buildall:
-	./mkrel.sh $(tool) $(VERSION)
-
-release: buildall
-	gh release create $(VERSION) --generate-notes releases/*
-
-show-versions: buildlocal
-	@echo "### golsky version:"
-	@./golsky -V
-
-	@echo
-	@echo "### go module versions:"
-	@go list -m all
-
-	@echo
-	@echo "### go version used for building:"
-	@grep -m 1 go go.mod
-
-# lint:
-# 	golangci-lint run -p bugs -p unused
-
-buildwasm:
-	env GOOS=js GOARCH=wasm go build -o $(tool).wasm $(LDFLAGS) .
-
-zipwasm:
-	zip -r openquell-$(SHORTVERSION).zip index.html $(tool).wasm wasm_exec.js
-
-wasm: buildwasm zipwasm
-	@ls -l $(tool)-$(SHORTVERSION).zip

README.md

@@ -18,7 +18,7 @@ Based on: https://youtu.be/FWSR_7kZuYg?si=ix1dmo76D8AmF25F
 
 * flexible parameters as grid and cell size
 * colors can be inverted
-* evolution  tracks can be shown,  with age the cells  color fades and
+* evolution  traces can be shown,  with age the cells  color fades and
   old life cells will be drawn in red
 * game grid lines can be enabled or disabled
 * game speed can be adjusted on startup and in-game
@@ -61,7 +61,7 @@ Usage of ./golsky:
   -p, --paused                     do not start simulation (use space to start)
   -f, --rle-file string            RLE pattern file
   -r, --rule string                game rule (default "B3/S23")
-  -s, --show-evolution             show evolution tracks
+  -s, --show-evolution             show evolution traces
   -t, --ticks-per-generation int   game speed: the higher the slower (default: 10) (default 10)
   -v, --version                    show version
   -W, --width int                  grid width in cells (default 40)
@@ -77,10 +77,12 @@ While it runs, there are a couple of commands you can use:
 * page down: slow down
 * Mouse wheel: zoom in or out
 * move mouse while middle mouse button pressed: move canvas
-* escape: reset to 1:1 zoom
+* r: reset to 1:1 zoom
+* escape: open menu
 * s: save game state to file (can be loaded with -l)
 * c: enter copy mode. Mark a rectangle with the mouse, when you
   release the mous button it is being saved to an RLE file
+* d: toggle debug output 
 * q: quit
 
 # Report bugs

TODO.md

@@ -1 +1,46 @@
-- Implement RLE writing on scene.MarkDone
+- 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
+- use left mouse to drag grid unless insert mode is active
+- 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/
+- add performance measurements, see:
+  DrawTriangles: https://github.com/TLINDEN/testgol
+  WritePixels:   https://github.com/TLINDEN/testgol/tree/wrpixels
+https://www.tasnimzotder.com/blog/optimizing-game-of-life-algorithm
+
+- Speed
+  https://conwaylife.com/forums/viewtopic.php?f=7&t=3237
+  
+- Patterns:
+
+A   Catagolue   textcensus   of,  say,   period-2   oscillators   from
+non-symmetrical soups can be found at
+
+https://catagolue.hatsya.com/textcensus/b3s23/C1/xp2
+
+The URL is made by just adding the prefix "text" to the word "census",
+in any URL linked to from a Catagolue census page such as this one:
+
+https://catagolue.hatsya.com/census/b3s23/C1
+
+Format:
+https://conwaylife.com/wiki/Apgcode
+
+
+Collections:
+
+https://conwaylife.com/wiki/Pattern_of_the_Year
+https://www.ibiblio.org/lifepatterns/
+https://entropymine.com/jason/life/
+https://github.com/Matthias-Merzenich/jslife-moving
+https://conwaylife.com/ref/mniemiec/lifepage.htm
+https://conwaylife.com/wiki/Spaceship ff.

config.go

@@ -1,205 +0,0 @@
-package main
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"runtime/pprof"
-	"strconv"
-	"strings"
-
-	"github.com/alecthomas/repr"
-	"github.com/spf13/pflag"
-	"github.com/tlinden/golsky/rle"
-)
-
-// all the settings comming from commandline, but maybe tweaked later from the UI
-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      bool     // game modi
-	ShowEvolution, NoGrid, RunOneStep bool     // flags
-	Rule                              *Rule    // which rule to use, default: B3/S23
-	RLE                               *rle.RLE // loaded GOL pattern from RLE file
-	Statefile                         string   // load game state from it if non-nil
-	StateGrid                         *Grid    // a grid from a statefile
-	Wrap                              bool     // wether wraparound mode is in place or not
-	ShowVersion                       bool
-
-	// for internal profiling
-	ProfileFile     string
-	ProfileDraw     bool
-	ProfileMaxLoops int64
-}
-
-const (
-	VERSION = "v0.0.7"
-	Alive   = 1
-	Dead    = 0
-)
-
-// parse given window geometry and adjust game settings according to it
-func (config *Config) ParseGeom(geom string) error {
-	if geom == "" {
-		config.ScreenWidth = config.Cellsize * config.Width
-		config.ScreenHeight = config.Cellsize * config.Height
-		return nil
-	}
-
-	// force a geom
-	geometry := strings.Split(geom, "x")
-	if len(geometry) != 2 {
-		return errors.New("failed to parse -g parameters, expecting WIDTHxHEIGHT")
-	}
-
-	width, err := strconv.Atoi(geometry[0])
-	if err != nil {
-		return errors.New("failed to parse width, expecting integer")
-	}
-
-	height, err := strconv.Atoi(geometry[1])
-	if err != nil {
-		return errors.New("failed to parse height, expecting integer")
-	}
-
-	// adjust dimensions, account for  grid width+height so that cells
-	// fit into window
-	config.ScreenWidth = width - (width % config.Width)
-	config.ScreenHeight = height - (height % config.Height)
-
-	if config.ScreenWidth == 0 || config.ScreenHeight == 0 {
-		return errors.New("the number of requested cells don't fit into the requested window size")
-	}
-
-	config.Cellsize = config.ScreenWidth / config.Width
-
-	repr.Println(config)
-	return nil
-}
-
-// check if we have  been given an RLE file to load,  then load it and
-// adjust game settings accordingly
-func (config *Config) ParseRLE(rlefile string) error {
-	if rlefile == "" {
-		return nil
-	}
-
-	rleobj, err := rle.GetRLE(rlefile)
-	if err != nil {
-		return err
-	}
-
-	if rleobj == nil {
-		return errors.New("failed to load RLE file (uncatched module error)")
-	}
-
-	config.RLE = rleobj
-
-	// adjust geometry if needed
-	if config.RLE.Width > config.Width || config.RLE.Height > config.Height {
-		config.Width = config.RLE.Width * 2
-		config.Height = config.RLE.Height * 2
-		config.Cellsize = config.ScreenWidth / config.Width
-	}
-
-	// RLE needs an empty grid
-	config.Empty = true
-
-	// it may come with its own rule
-	if config.RLE.Rule != "" {
-		config.Rule = ParseGameRule(config.RLE.Rule)
-	}
-
-	return nil
-}
-
-// parse a state file, if given, and adjust game settings accordingly
-func (config *Config) ParseStatefile(statefile string) error {
-	if config.Statefile == "" {
-		return nil
-	}
-
-	grid, err := LoadState(config.Statefile)
-	if err != nil {
-		return fmt.Errorf("failed to load game state: %s", err)
-	}
-
-	config.Width = grid.Width
-	config.Height = grid.Height
-	config.Cellsize = config.ScreenWidth / config.Width
-	config.StateGrid = grid
-
-	return nil
-}
-
-func (config *Config) EnableCPUProfiling(filename string) error {
-	if filename == "" {
-		return nil
-	}
-
-	fd, err := os.Create(filename)
-	if err != nil {
-		return err
-	}
-
-	pprof.StartCPUProfile(fd)
-	defer pprof.StopCPUProfile()
-
-	return nil
-}
-
-func ParseCommandline() (*Config, error) {
-	config := Config{}
-
-	var (
-		rule, rlefile, geom string
-	)
-
-	// commandline params, most configure directly config flags
-	pflag.IntVarP(&config.Width, "width", "W", 40, "grid width in cells")
-	pflag.IntVarP(&config.Height, "height", "H", 40, "grid height in cells")
-	pflag.IntVarP(&config.Cellsize, "cellsize", "c", 8, "cell size in pixels")
-	pflag.StringVarP(&geom, "geom", "g", "", "window geometry in WxH in pixels, overturns -c")
-
-	pflag.IntVarP(&config.Density, "density", "D", 10, "density of random cells")
-	pflag.IntVarP(&config.TPG, "ticks-per-generation", "t", 10,
-		"game speed: the higher the slower (default: 10)")
-
-	pflag.StringVarP(&rule, "rule", "r", "B3/S23", "game rule")
-	pflag.StringVarP(&rlefile, "rle-file", "f", "", "RLE pattern file")
-	pflag.StringVarP(&config.Statefile, "load-state-file", "l", "", "game state file")
-
-	pflag.BoolVarP(&config.ShowVersion, "version", "v", false, "show version")
-	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.NoGrid, "nogrid", "n", false, "do not 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 tracks")
-	pflag.BoolVarP(&config.Wrap, "wrap-around", "w", false, "wrap around grid mode")
-
-	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()
-
-	err := config.ParseGeom(geom)
-	if err != nil {
-		return nil, err
-	}
-
-	err = config.ParseRLE(rlefile)
-	if err != nil {
-		return nil, err
-	}
-
-	// load  rule from commandline  when no  rule came from  RLE file,
-	// default is B3/S23, aka conways game of life
-	if config.Rule == nil {
-		config.Rule = ParseGameRule(rule)
-	}
-
-	return &config, nil
-}

game.go

@@ -1,69 +0,0 @@
-package main
-
-import "github.com/hajimehoshi/ebiten/v2"
-
-type Game struct {
-	ScreenWidth, ScreenHeight, Cellsize int
-	Scenes                              map[SceneName]Scene
-	CurrentScene                        SceneName
-	Config                              *Config
-	Shader                              *ebiten.Shader
-}
-
-func NewGame(config *Config, shader *ebiten.Shader, startscene SceneName) *Game {
-	game := &Game{
-		Config:       config,
-		Scenes:       map[SceneName]Scene{},
-		ScreenWidth:  config.ScreenWidth,
-		ScreenHeight: config.ScreenHeight,
-		Shader:       shader,
-	}
-
-	// setup scene[s]
-	game.CurrentScene = startscene
-	game.Scenes[Play] = NewPlayScene(game, config)
-
-	// setup environment
-	ebiten.SetWindowSize(game.ScreenWidth, game.ScreenHeight)
-	ebiten.SetWindowTitle("golsky - conway's game of life")
-	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
-
-	return game
-}
-
-func (game *Game) GetCurrentScene() Scene {
-	return game.Scenes[game.CurrentScene]
-}
-
-func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
-	return game.ScreenWidth, game.ScreenHeight
-}
-
-func (game *Game) Update() error {
-	scene := game.GetCurrentScene()
-	scene.Update()
-
-	next := scene.GetNext()
-
-	if next != game.CurrentScene {
-		// make sure we stay on the selected scene
-		scene.ResetNext()
-
-		// finally switch
-		game.CurrentScene = next
-	}
-
-	return nil
-}
-
-func (game *Game) Draw(screen *ebiten.Image) {
-	scene := game.GetCurrentScene()
-
-	if scene.Clearscreen() {
-		ebiten.SetScreenClearedEveryFrame(true)
-	} else {
-		ebiten.SetScreenClearedEveryFrame(false)
-	}
-
-	scene.Draw(screen)
-}

go.mod

@@ -13,7 +13,12 @@ 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/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
+	github.com/tinne26/etxt v0.0.8 // indirect
+	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect
 	golang.org/x/sync v0.7.0 // indirect
 	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
 )

go.sum

@@ -6,15 +6,27 @@ github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj
 github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
 github.com/ebitengine/purego v0.7.0 h1:HPZpl61edMGCEW6XK2nsR6+7AnJ3unUxpTZBkkIXnMc=
 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/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=
 github.com/hajimehoshi/ebiten/v2 v2.7.4/go.mod h1:H2pHVgq29rfm5yeQ7jzWOM3VHsjo7/AyucODNLOhsVY=
 github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
 github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/tinne26/etxt v0.0.8 h1:rjb58jkMkapRGLmhBMWnT76E/nMTXC5P1Q956BRZkoc=
+github.com/tinne26/etxt v0.0.8/go.mod h1:QM/hlNkstsKC39elTFNKAR34xsMb9QoVosf+g9wlYxM=
+github.com/tinne26/etxt v0.0.9-alpha.6.0.20240409152929-91bfc562becc h1:+USGSXbkrRAy6bz3Qm4GUczhqeXe7XlRfkRexCSFxkw=
+github.com/tinne26/etxt v0.0.9-alpha.6.0.20240409152929-91bfc562becc/go.mod h1:Icbd4bDjrXag1oYIhB51CrkMYqRb7YMv0AsrOSfNKfU=
+golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 h1:LfspQV/FYTatPTr/3HzIcmiUFH7PGP+OQ6mgDYo3yuQ=
+golang.org/x/exp v0.0.0-20240222234643-814bf88cf225/go.mod h1:CxmFvTBINI24O/j8iY7H1xHzx2i4OsyguNBmN/uPtqc=
 golang.org/x/image v0.16.0 h1:9kloLAKhUufZhA12l5fwnx2NZW39/we1UhBesW433jw=
 golang.org/x/image v0.16.0/go.mod h1:ugSZItdV4nOxyqp56HmXwH0Ry0nBCpjnZdpDaIHdoPs=
 golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
 golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=

grid.go

@@ -1,153 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"errors"
-	"fmt"
-	"math/rand"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-)
-
-type Grid struct {
-	Data                   [][]int64
-	Width, Height, Density int
-	Empty                  bool
-}
-
-// Create new empty grid and allocate Data according to provided dimensions
-func NewGrid(width, height, density int, empty bool) *Grid {
-	grid := &Grid{
-		Height:  height,
-		Width:   width,
-		Density: density,
-		Data:    make([][]int64, height),
-		Empty:   empty,
-	}
-
-	for y := 0; y < height; y++ {
-		grid.Data[y] = make([]int64, width)
-	}
-
-	return grid
-}
-
-func (grid *Grid) Clone() *Grid {
-	newgrid := &Grid{}
-
-	newgrid.Width = grid.Width
-	newgrid.Height = grid.Height
-	newgrid.Data = grid.Data
-
-	return newgrid
-}
-
-func (grid *Grid) Clear() {
-	for y := range grid.Data {
-		for x := range grid.Data[y] {
-			grid.Data[y][x] = 0
-		}
-	}
-}
-
-func (grid *Grid) FillRandom(game *ScenePlay) {
-	if !grid.Empty {
-		for y := range grid.Data {
-			for x := range grid.Data[y] {
-				if rand.Intn(grid.Density) == 1 {
-					grid.Data[y][x] = 1
-				}
-			}
-		}
-	}
-}
-
-func GetFilename(generations int64) string {
-	now := time.Now()
-	return fmt.Sprintf("dump-%s-%d.gol", now.Format("20060102150405"), generations)
-}
-
-func GetFilenameRLE(generations int64) string {
-	now := time.Now()
-	return fmt.Sprintf("rect-%s-%d.rle", now.Format("20060102150405"), generations)
-}
-
-func (grid *Grid) SaveState(filename string) error {
-	file, err := os.Create(filename)
-	if err != nil {
-		return fmt.Errorf("failed to open state file: %w", err)
-	}
-	defer file.Close()
-
-	for y, _ := range grid.Data {
-		for _, cell := range grid.Data[y] {
-			_, err := file.WriteString(strconv.FormatInt(cell, 10))
-			if err != nil {
-				return fmt.Errorf("failed to write to state file: %w", err)
-			}
-		}
-		file.WriteString("\n")
-	}
-
-	return nil
-}
-
-func LoadState(filename string) (*Grid, error) {
-	fd, err := os.Open(filename)
-	if err != nil {
-		return nil, err
-	}
-
-	scanner := bufio.NewScanner(fd)
-
-	scanner.Split(bufio.ScanLines)
-
-	grid := &Grid{}
-
-	for scanner.Scan() {
-		items := strings.Split(scanner.Text(), "")
-		row := make([]int64, len(items))
-
-		for idx, item := range items {
-			num, err := strconv.ParseInt(item, 10, 64)
-			if err != nil {
-				return nil, err
-			}
-
-			if num > 1 {
-				return nil, errors.New("cells must be 0 or 1")
-			}
-
-			row[idx] = num
-		}
-
-		grid.Data = append(grid.Data, row)
-	}
-
-	// sanity check the grid
-	explen := 0
-	rows := 0
-	first := true
-	for _, row := range grid.Data {
-		length := len(row)
-
-		if first {
-			explen = length
-			first = false
-		}
-
-		if explen != length {
-			return nil, fmt.Errorf(fmt.Sprintf("all rows must be in the same length, got: %d, expected: %d",
-				length, explen))
-		}
-
-		rows++
-	}
-
-	grid.Width = explen
-	grid.Height = rows
-
-	return grid, nil
-}

main.go

@@ -1,110 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"runtime/pprof"
-	"time"
-
-	_ "net/http/pprof"
-
-	"github.com/hajimehoshi/ebiten/v2"
-)
-
-var Shader string = `
-//kage:unit pixels
-
-package main
-
-var Alife int
-
-func Fragment(_ vec4, pos vec2, _ vec4) vec4 {
-	if Alife == 1 {
-		return vec4(0.0)
-	}
-
-	return vec4(1.0)
-}
-`
-
-func main() {
-	config, err := ParseCommandline()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	if config.ShowVersion {
-		fmt.Printf("This is golsky version %s\n", VERSION)
-		os.Exit(0)
-	}
-
-	shader, err := ebiten.NewShader([]byte(Shader))
-	if err != nil {
-		fmt.Println(Shader)
-		log.Fatalf("failed to compile shader: %s\n", err)
-	}
-
-	game := NewGame(config, shader, Play)
-
-	if config.ProfileFile != "" {
-		// enable cpu profiling and use fake game loop
-		fd, err := os.Create(config.ProfileFile)
-		if err != nil {
-			log.Fatal(err)
-		}
-		defer fd.Close()
-
-		pprof.StartCPUProfile(fd)
-		defer pprof.StopCPUProfile()
-
-		Ebitfake(game)
-
-		pprof.StopCPUProfile()
-		fd.Close()
-
-		os.Exit(0)
-	}
-
-	fd, err := os.Create("cpu.profile")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer fd.Close()
-
-	pprof.StartCPUProfile(fd)
-	defer pprof.StopCPUProfile()
-	// main loop
-	if err := ebiten.RunGame(game); err != nil {
-		log.Fatal(err)
-	}
-}
-
-// fake game  loop, required to be  able to profile the  program using
-// pprof. Otherwise any kind of program  exit leads to an empty profile
-// file.
-func Ebitfake(game *Game) {
-	screen := ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
-
-	var loops int64
-
-	for {
-		err := game.Update()
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		if game.Config.ProfileDraw {
-			game.Draw(screen)
-		}
-
-		fmt.Print(".")
-		time.Sleep(16 * time.Millisecond) // around 60 TPS
-
-		if loops >= game.Config.ProfileMaxLoops {
-			break
-		}
-
-		loops++
-	}
-}

rle/rle.go

@@ -120,7 +120,7 @@ func removeWhitespace(input string) string {
 }
 
 // Store a grid to an RLE file
-func StoreGridToRLE(grid [][]int64, filename, rule string, width, height int) error {
+func StoreGridToRLE(grid [][]uint8, filename, rule string, width, height int) error {
 	fd, err := os.Create(filename)
 	if err != nil {
 		return err

src/Makefile

@@ -0,0 +1,97 @@
+# Copyright © 2024 Thomas von Dein
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+#
+# no need to modify anything below
+tool      = golsky
+VERSION   = $(shell grep VERSION main.go | head -1 | cut -d '"' -f2)
+archs     = darwin freebsd linux windows
+PREFIX    = /usr/local
+UID       = root
+GID       = 0
+HAVE_POD := $(shell pod2text -h 2>/dev/null)
+#TAGS      = -tags=ebitenginedebug
+
+all: buildlocal
+
+
+buildlocal:
+	go build $(TAGS) -o $(tool)
+
+install: buildlocal
+	install -d -o $(UID) -g $(GID) $(PREFIX)/bin
+	install -d -o $(UID) -g $(GID) $(PREFIX)/man/man1
+	install -o $(UID) -g $(GID) -m 555 $(tool)  $(PREFIX)/sbin/
+	install -o $(UID) -g $(GID) -m 444 $(tool).1 $(PREFIX)/man/man1/
+
+clean:
+	rm -rf $(tool) coverage.out testdata t/out
+
+test: clean
+	mkdir -p t/out
+	go test ./... $(ARGS)
+
+testlint: test lint
+
+lint:
+	golangci-lint run
+
+lint-full:
+	golangci-lint run --enable-all --exclude-use-default --disable exhaustivestruct,exhaustruct,depguard,interfacer,deadcode,golint,structcheck,scopelint,varcheck,ifshort,maligned,nosnakecase,godot,funlen,gofumpt,cyclop,noctx,gochecknoglobals,paralleltest
+
+testfuzzy: clean
+	go test -fuzz ./... $(ARGS)
+
+singletest:
+	@echo "Call like this: make singletest TEST=TestPrepareColumns ARGS=-v"
+	go test -run $(TEST) $(ARGS)
+
+cover-report:
+	go test ./... -cover -coverprofile=coverage.out
+	go tool cover -html=coverage.out
+
+goupdate:
+	go get -t -u=patch ./...
+
+buildall:
+	./mkrel.sh $(tool) $(VERSION)
+
+release: buildall
+	gh release create $(VERSION) --generate-notes releases/*
+
+show-versions: buildlocal
+	@echo "### golsky version:"
+	@./golsky -V
+
+	@echo
+	@echo "### go module versions:"
+	@go list -m all
+
+	@echo
+	@echo "### go version used for building:"
+	@grep -m 1 go go.mod
+
+# lint:
+# 	golangci-lint run -p bugs -p unused
+
+buildwasm:
+	env GOOS=js GOARCH=wasm go build -o $(tool).wasm $(LDFLAGS) .
+
+zipwasm:
+	zip -r openquell-$(SHORTVERSION).zip index.html $(tool).wasm wasm_exec.js
+
+wasm: buildwasm zipwasm
+	@ls -l $(tool)-$(SHORTVERSION).zip

src/assets/shaders/row.kg

@@ -0,0 +1,13 @@
+//kage:unit pixels
+
+package main
+
+var Alife int
+
+func Fragment(_ vec4, pos vec2, _ vec4) vec4 {
+        if Alife == 1 {
+                return vec4(0.0)
+        }
+
+        return vec4(1.0)
+}

src/camera.go

@@ -1,3 +1,5 @@
+// this comes from the camera example but I enhanced it a little bit
+
 package main
 
 import (
@@ -12,6 +14,9 @@ type Camera struct {
 	ViewPort          f64.Vec2
 	Position          f64.Vec2
 	ZoomFactor        int
+	InitialZoomFactor int
+	InitialPosition   f64.Vec2
+	ZoomOutFactor     int
 }
 
 func (c *Camera) String() string {
@@ -32,15 +37,17 @@ func (c *Camera) worldMatrix() ebiten.GeoM {
 	m := ebiten.GeoM{}
 	m.Translate(-c.Position[0], -c.Position[1])
 
+	viewportCenter := c.viewportCenter()
+
 	// We want to scale and rotate around center of image / screen
-	m.Translate(-c.viewportCenter()[0], -c.viewportCenter()[1])
+	m.Translate(-viewportCenter[0], -viewportCenter[1])
 
 	m.Scale(
 		math.Pow(1.01, float64(c.ZoomFactor)),
 		math.Pow(1.01, float64(c.ZoomFactor)),
 	)
 
-	m.Translate(c.viewportCenter()[0], c.viewportCenter()[1])
+	m.Translate(viewportCenter[0], viewportCenter[1])
 	return m
 }
 
@@ -61,8 +68,14 @@ func (c *Camera) ScreenToWorld(posX, posY int) (float64, float64) {
 	}
 }
 
-func (c *Camera) Reset() {
+func (c *Camera) Setup() {
-	c.Position[0] = 0
+	c.Position[0] = c.InitialPosition[0]
-	c.Position[1] = 0
+	c.Position[1] = c.InitialPosition[1]
-	c.ZoomFactor = 0
+	c.ZoomFactor = c.InitialZoomFactor
+}
+
+func (c *Camera) Reset() {
+	c.Position[0] = c.InitialPosition[0]
+	c.Position[1] = c.InitialPosition[1]
+	c.ZoomFactor = c.ZoomOutFactor
 }

src/config.go

@@ -0,0 +1,265 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"os"
+	"runtime/pprof"
+	"strconv"
+	"strings"
+
+	"github.com/spf13/pflag"
+	"github.com/tlinden/golsky/rle"
+)
+
+// all the settings comming from commandline, but maybe tweaked later from the UI
+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
+	ShowEvolution, ShowGrid, RunOneStep    bool     // flags
+	Rule                                   *Rule    // which rule to use, default: B3/S23
+	RLE                                    *rle.RLE // loaded GOL pattern from RLE file
+	Statefile                              string   // load game state from it if non-nil
+	StateGrid                              *Grid    // a grid from a statefile
+	Wrap                                   bool     // wether wraparound mode is in place or not
+	ShowVersion                            bool
+	UseShader                              bool // to use a shader to render alife cells
+	Restart, RestartGrid, RestartCache     bool
+	StartWithMenu                          bool
+	Zoomfactor                             int
+	ZoomOutFactor                          int
+	InitialCamPos                          []float64
+	DelayedStart                           bool // if true game, we wait. like pause but program induced
+
+	// for internal profiling
+	ProfileFile     string
+	ProfileDraw     bool
+	ProfileMaxLoops int64
+}
+
+const (
+	VERSION = "v0.0.8"
+	Alive   = 1
+	Dead    = 0
+
+	DEFAULT_GRID_WIDTH  = 600
+	DEFAULT_GRID_HEIGHT = 400
+	DEFAULT_CELLSIZE    = 4
+	DEFAULT_ZOOMFACTOR  = 150
+	DEFAULT_GEOM        = "640x384"
+)
+
+func (config *Config) SetupCamera() {
+	config.Zoomfactor = DEFAULT_ZOOMFACTOR
+
+	// calculate the initial cam pos. It is negative if the total grid
+	// size  is smaller than  the screen  in a centered  position, but
+	// it's zero if it's equal or larger than the screen.
+	config.InitialCamPos = make([]float64, 2)
+
+	config.InitialCamPos[0] = float64(((config.ScreenWidth - (config.Width * config.Cellsize)) / 2) * -1)
+	if config.Width*config.Cellsize >= config.ScreenWidth {
+		// must be positive if world wider than screen
+		config.InitialCamPos[0] = math.Abs(config.InitialCamPos[0])
+	}
+
+	// same for Y
+	config.InitialCamPos[1] = float64(((config.ScreenHeight - (config.Height * config.Cellsize)) / 2) * -1)
+	if config.Height*config.Cellsize > config.ScreenHeight {
+		config.InitialCamPos[1] = math.Abs(config.InitialCamPos[1])
+	}
+
+	// Calculate  zoom out factor, which  shows 100% of the  world. We
+	// need to reverse math.Pow(1.01,  $zoomfactor) to get the correct
+	// percentage of  the world to show.  I.e: with  a ScreenHeight of
+	// 384px and a world of 800px the factor to show 100% of the world
+	// is  -75: math.Log(384/800) / math.Log(1.01).  The 1.01 constant
+	// is being used in camera.go:worldMatrix().
+
+	// FIXME: determine if the diff is larger on width, then calc with
+	// width instead of height
+	config.ZoomOutFactor = int(
+		math.Log(float64(config.ScreenHeight)/(float64(config.Height)*float64(config.Cellsize))) /
+			math.Log(1.01))
+}
+
+// parse given window geometry and adjust game settings according to it
+func (config *Config) ParseGeom(geom string) error {
+	// force a geom
+	geometry := strings.Split(geom, "x")
+	if len(geometry) != 2 {
+		return errors.New("failed to parse -g parameters, expecting WIDTHxHEIGHT")
+	}
+
+	width, err := strconv.Atoi(geometry[0])
+	if err != nil {
+		return errors.New("failed to parse width, expecting integer")
+	}
+
+	height, err := strconv.Atoi(geometry[1])
+	if err != nil {
+		return errors.New("failed to parse height, expecting integer")
+	}
+
+	config.ScreenWidth = width
+	config.ScreenHeight = height
+
+	config.Cellsize = DEFAULT_CELLSIZE
+
+	return nil
+}
+
+// check if we have  been given an RLE or LIF file  to load, then load
+// it and adjust game settings accordingly
+func (config *Config) ParseRLE(rlefile string) error {
+	if rlefile == "" {
+		return nil
+	}
+
+	var rleobj *rle.RLE
+
+	if strings.HasSuffix(rlefile, ".lif") {
+		lifobj, err := LoadLIF(rlefile)
+		if err != nil {
+			return err
+		}
+
+		rleobj = lifobj
+	} else {
+		rleobject, err := rle.GetRLE(rlefile)
+		if err != nil {
+			return err
+		}
+
+		rleobj = rleobject
+	}
+
+	if rleobj == nil {
+		return errors.New("failed to load pattern file (uncatched module error)")
+	}
+
+	config.RLE = rleobj
+
+	// adjust geometry if needed
+	if config.RLE.Width > config.Width || config.RLE.Height > config.Height {
+		config.Width = config.RLE.Width * 2
+		config.Height = config.RLE.Height * 2
+		config.Cellsize = config.ScreenWidth / config.Width
+	}
+
+	fmt.Printf("width: %d, screenwidth: %d, rlewidth: %d, cellsize: %d\n",
+		config.Width, config.ScreenWidth, config.RLE.Width, config.Cellsize)
+
+	// RLE needs an empty grid
+	config.Empty = true
+
+	// it may come with its own rule
+	if config.RLE.Rule != "" {
+		config.Rule = ParseGameRule(config.RLE.Rule)
+	}
+
+	return nil
+}
+
+func (config *Config) EnableCPUProfiling(filename string) error {
+	if filename == "" {
+		return nil
+	}
+
+	fd, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+
+	pprof.StartCPUProfile(fd)
+	defer pprof.StopCPUProfile()
+
+	return nil
+}
+
+func ParseCommandline() (*Config, error) {
+	config := Config{}
+
+	var (
+		rule, rlefile, geom string
+	)
+
+	// commandline params, most configure directly config flags
+	pflag.IntVarP(&config.Width, "width", "W", DEFAULT_GRID_WIDTH, "grid width in cells")
+	pflag.IntVarP(&config.Height, "height", "H", DEFAULT_GRID_HEIGHT, "grid height in cells")
+	pflag.IntVarP(&config.Cellsize, "cellsize", "c", 8, "cell size in pixels")
+	pflag.StringVarP(&geom, "geom", "G", DEFAULT_GEOM, "window geometry in WxH in pixels, overturns -c")
+
+	pflag.IntVarP(&config.Density, "density", "D", 10, "density of random cells")
+	pflag.IntVarP(&config.TPG, "ticks-per-generation", "t", 10,
+		"game speed: the higher the slower (default: 10)")
+
+	pflag.StringVarP(&rule, "rule", "r", "B3/S23", "game rule")
+	pflag.StringVarP(&rlefile, "pattern-file", "f", "", "RLE or LIF pattern file")
+
+	pflag.BoolVarP(&config.ShowVersion, "version", "v", false, "show version")
+	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")
+	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()
+
+	err := config.ParseGeom(geom)
+	if err != nil {
+		return nil, err
+	}
+
+	err = config.ParseRLE(rlefile)
+	if err != nil {
+		return nil, err
+	}
+
+	// load  rule from commandline  when no  rule came from  RLE file,
+	// default is B3/S23, aka conways game of life
+	if config.Rule == nil {
+		config.Rule = ParseGameRule(rule)
+	}
+
+	config.SetupCamera()
+
+	//repr.Println(config)
+	return &config, nil
+}
+
+func (config *Config) TogglePaused() {
+	config.Paused = !config.Paused
+}
+
+func (config *Config) ToggleDebugging() {
+	config.Debug = !config.Debug
+}
+
+func (config *Config) ToggleInvert() {
+	config.Invert = !config.Invert
+	config.RestartCache = true
+}
+
+func (config *Config) ToggleGridlines() {
+	config.ShowGrid = !config.ShowGrid
+	config.RestartCache = true
+}
+
+func (config *Config) ToggleEvolution() {
+	config.ShowEvolution = !config.ShowEvolution
+}
+
+func (config *Config) ToggleWrap() {
+	config.Wrap = !config.Wrap
+}

src/game.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Game struct {
+	ScreenWidth, ScreenHeight, ReadlWidth, Cellsize int
+	Scenes                                          map[SceneName]Scene
+	CurrentScene                                    SceneName
+	Config                                          *Config
+	Scale                                           float32
+	Screen                                          *ebiten.Image
+}
+
+func NewGame(config *Config, startscene SceneName) *Game {
+	game := &Game{
+		Config:       config,
+		Scenes:       map[SceneName]Scene{},
+		ScreenWidth:  config.ScreenWidth,
+		ScreenHeight: config.ScreenHeight,
+	}
+
+	// setup scene[s]
+	game.CurrentScene = startscene
+	game.Scenes[Play] = NewPlayScene(game, config)
+	game.Scenes[Menu] = NewMenuScene(game, config)
+	game.Scenes[Options] = NewOptionsScene(game, config)
+
+	// setup environment
+	ebiten.SetWindowSize(game.ScreenWidth, game.ScreenHeight)
+	ebiten.SetWindowTitle("golsky - conway's game of life")
+	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
+	ebiten.SetScreenClearedEveryFrame(true)
+
+	game.Screen = ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
+	return game
+}
+
+func (game *Game) GetCurrentScene() Scene {
+	return game.Scenes[game.CurrentScene]
+}
+
+func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	game.ReadlWidth = outsideWidth
+	game.Scale = float32(game.ScreenWidth) / float32(outsideWidth)
+	return game.ScreenWidth, game.ScreenHeight
+}
+
+func (game *Game) Update() error {
+	scene := game.GetCurrentScene()
+
+	if quit := scene.Update(); quit != nil {
+		return quit
+	}
+
+	next := scene.GetNext()
+	if next != game.CurrentScene {
+		game.Scenes[next].SetPrevious(game.CurrentScene)
+		scene.ResetNext()
+		game.CurrentScene = next
+	}
+
+	return nil
+}
+
+func (game *Game) Draw(screen *ebiten.Image) {
+	// first draw primary scene[s], although there are only 1
+	for current, scene := range game.Scenes {
+		if scene.IsPrimary() {
+			// primary scenes always draw
+			scene.Draw(screen)
+
+			if current == game.CurrentScene {
+				// avoid to redraw it in the next step
+				return
+			}
+		}
+	}
+
+	scene := game.GetCurrentScene()
+	scene.Draw(screen)
+}

src/grid.go

@@ -0,0 +1,244 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"math/rand"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/tlinden/golsky/rle"
+)
+
+type Grid struct {
+	Data                   [][]uint8
+	Width, Height, Density int
+	Empty                  bool
+}
+
+// Create new empty grid and allocate Data according to provided dimensions
+func NewGrid(width, height, density int, empty bool) *Grid {
+	grid := &Grid{
+		Height:  height,
+		Width:   width,
+		Density: density,
+		Data:    make([][]uint8, height),
+		Empty:   empty,
+	}
+
+	for y := 0; y < height; y++ {
+		grid.Data[y] = make([]uint8, width)
+	}
+
+	return grid
+}
+
+// Create a new 1:1 instance
+func (grid *Grid) Clone() *Grid {
+	newgrid := &Grid{}
+
+	newgrid.Width = grid.Width
+	newgrid.Height = grid.Height
+	newgrid.Data = grid.Data
+
+	return newgrid
+}
+
+// copy data
+func (grid *Grid) Copy(other *Grid) {
+	for y := range grid.Data {
+		for x := range grid.Data[y] {
+			other.Data[y][x] = grid.Data[y][x]
+		}
+	}
+}
+
+// delete all contents
+func (grid *Grid) Clear() {
+	for y := range grid.Data {
+		for x := range grid.Data[y] {
+			grid.Data[y][x] = 0
+		}
+	}
+}
+
+// initialize with random life cells using the given density
+func (grid *Grid) FillRandom() {
+	if !grid.Empty {
+		for y := range grid.Data {
+			for x := range grid.Data[y] {
+				if rand.Intn(grid.Density) == 1 {
+					grid.Data[y][x] = 1
+				}
+			}
+		}
+	}
+}
+
+func (grid *Grid) Dump() {
+	for y := 0; y < grid.Height; y++ {
+		for x := 0; x < grid.Width; x++ {
+			if grid.Data[y][x] == 1 {
+				fmt.Print("XX")
+			} else {
+				fmt.Print("  ")
+			}
+		}
+		fmt.Println()
+	}
+}
+
+// initialize using a given RLE pattern
+func (grid *Grid) LoadRLE(pattern *rle.RLE) {
+	if pattern != nil {
+		startX := (grid.Width / 2) - (pattern.Width / 2)
+		startY := (grid.Height / 2) - (pattern.Height / 2)
+		var y, x int
+
+		for rowIndex, patternRow := range pattern.Pattern {
+			for colIndex := range patternRow {
+				if pattern.Pattern[rowIndex][colIndex] > 0 {
+					x = colIndex + startX
+					y = rowIndex + startY
+
+					grid.Data[y][x] = 1
+				}
+			}
+		}
+
+		//grid.Dump()
+	}
+}
+
+// load a lif file parameters like R and P are not supported yet
+func LoadLIF(filename string) (*rle.RLE, error) {
+	fd, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	scanner := bufio.NewScanner(fd)
+
+	scanner.Split(bufio.ScanLines)
+
+	gothead := false
+
+	grid := &rle.RLE{}
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		items := strings.Split(line, "")
+
+		if len(items) < 0 {
+			continue
+		}
+
+		if strings.Contains(line, "# r") {
+			parts := strings.Split(line, " ")
+			if len(parts) == 2 {
+				grid.Rule = parts[1]
+			}
+
+			continue
+		}
+
+		if items[0] == "#" {
+			if gothead {
+				break
+			}
+
+			continue
+		}
+
+		gothead = true
+
+		row := make([]int, len(items))
+
+		for idx, item := range items {
+			switch item {
+			case ".":
+				row[idx] = 0
+			case "o":
+				fallthrough
+			case "*":
+				row[idx] = 1
+			default:
+				return nil, errors.New("cells must be . or o")
+			}
+		}
+
+		grid.Pattern = append(grid.Pattern, row)
+	}
+
+	// sanity check the grid
+	explen := 0
+	rows := 0
+	first := true
+	for _, row := range grid.Pattern {
+		length := len(row)
+
+		if first {
+			explen = length
+			first = false
+		}
+
+		if explen != length {
+			return nil, fmt.Errorf(
+				fmt.Sprintf("all rows must be in the same length, got: %d, expected: %d",
+					length, explen))
+		}
+
+		rows++
+	}
+
+	grid.Width = explen
+	grid.Height = rows
+
+	return grid, nil
+}
+
+// save  the contents  of  the  whole grid  as  a  simple lif  alike
+// file. One line per row, 0 for dead and 1 for life cell.
+// file format: https://conwaylife.com/wiki/Life_1.05
+func (grid *Grid) SaveState(filename, rule string) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		return fmt.Errorf("failed to open state file: %w", err)
+	}
+	defer file.Close()
+
+	fmt.Fprintf(file, "#Life 1.05\n#R %s\n#D golsky state file\n#P -1 -1\n", rule)
+
+	for y := range grid.Data {
+		for _, cell := range grid.Data[y] {
+			row := ""
+			switch cell {
+			case 1:
+				row += "o"
+			case 0:
+				row += "."
+			}
+
+			_, err := file.WriteString(row)
+			if err != nil {
+				return fmt.Errorf("failed to write to state file: %w", err)
+			}
+		}
+		file.WriteString("\n")
+	}
+
+	return nil
+}
+
+// generate filenames for dumps
+func GetFilename(generations uint64) string {
+	now := time.Now()
+	return fmt.Sprintf("dump-%s-%d.lif", now.Format("20060102150405"), generations)
+}
+
+func GetFilenameRLE(generations uint64) string {
+	now := time.Now()
+	return fmt.Sprintf("rect-%s-%d.rle", now.Format("20060102150405"), generations)
+}

src/loader-fonts.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"log"
+
+	"github.com/golang/freetype/truetype"
+	"github.com/tinne26/etxt"
+	"golang.org/x/image/font"
+)
+
+var FontRenderer = LoadFonts("assets/fonts")
+
+const (
+	GameFont       string = "NotoSans-Regular"
+	GameFontETXT   string = "Noto Sans"
+	FontSizeBig    int    = 48
+	FontSizeNormal int    = 24
+	FontSizeSmall  int    = 12
+)
+
+type Texter struct {
+	Renderer   *etxt.Renderer
+	FontNormal *font.Face
+	FontBig    *font.Face
+	FontSmall  *font.Face
+}
+
+func LoadFonts(dir string) Texter {
+	// load the font for use with ebitenui
+	fontbytes, err := assetfs.ReadFile(dir + "/" + GameFont + ".ttf")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gamefont, err := truetype.Parse(fontbytes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeNormal),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	biggameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeBig),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	smallgameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeSmall),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	// load the font for use with etxt
+	fontlib := etxt.NewFontLibrary()
+	_, _, err = fontlib.ParseEmbedDirFonts(dir, assetfs)
+	if err != nil {
+		log.Fatalf("Error while loading fonts: %s", err.Error())
+	}
+
+	/*
+		err = fontlib.EachFont(
+			func(fontName string, font *etxt.Font) error {
+				fmt.Printf("font: %s\n", fontName)
+				return nil
+			})
+		if err != nil {
+			log.Fatal(err)
+		}
+	*/
+
+	if !fontlib.HasFont(GameFontETXT) {
+		log.Fatal("missing font: " + GameFontETXT)
+	}
+
+	err = fontlib.EachFont(checkMissingRunes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	renderer := etxt.NewStdRenderer()
+
+	glyphsCache := etxt.NewDefaultCache(10 * 1024 * 1024) // 10MB
+	renderer.SetCacheHandler(glyphsCache.NewHandler())
+	renderer.SetFont(fontlib.GetFont(GameFontETXT))
+
+	return Texter{
+		Renderer:   renderer,
+		FontNormal: &gameface,
+		FontBig:    &biggameface,
+		FontSmall:  &smallgameface,
+	}
+}
+
+// helper function used with FontLibrary.EachFont to make sure
+// all loaded fonts contain the characters or alphabet we want
+func checkMissingRunes(name string, font *etxt.Font) error {
+	const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	const symbols = "0123456789 .,;:!?-()[]{}_&#@"
+
+	missing, err := etxt.GetMissingRunes(font, letters+symbols)
+	if err != nil {
+		return err
+	}
+	if len(missing) > 0 {
+		log.Fatalf("Font '%s' missing runes: %s", name, string(missing))
+	}
+	return nil
+}

src/loader-shaders.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bytes"
+	"log"
+	"log/slog"
+	"path"
+	"strings"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type ShaderRegistry map[string]*ebiten.Shader
+
+var Shaders = LoadShaders("assets/shaders")
+
+func LoadShaders(dir string) ShaderRegistry {
+	shaders := ShaderRegistry{}
+
+	entries, err := assetfs.ReadDir(dir)
+	if err != nil {
+		log.Fatalf("failed to read shaders dir %s: %s", dir, err)
+	}
+
+	for _, file := range entries {
+		path := path.Join(dir, file.Name())
+		fd, err := assetfs.Open(path)
+		if err != nil {
+			log.Fatalf("failed to open shader file %s: %s", file.Name(), err)
+		}
+		defer fd.Close()
+
+		name := strings.TrimSuffix(file.Name(), ".kg")
+
+		buf := new(bytes.Buffer)
+		buf.ReadFrom(fd)
+
+		shader, err := ebiten.NewShader([]byte(buf.Bytes()))
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		shaders[name] = shader
+
+		slog.Debug("loaded shader asset", "path", path)
+	}
+
+	return shaders
+}

src/loader-sprites.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"embed"
+	"image"
+	_ "image/png"
+	"io/fs"
+	"log"
+	"path"
+	"strings"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+// Maps image name to image data
+type AssetRegistry map[string]*ebiten.Image
+
+// A helper to pass the registry easier around
+type assetData struct {
+	Registry AssetRegistry
+}
+
+//go:embed assets/sprites/*.png assets/fonts/*.ttf assets/shaders/*.kg
+var assetfs embed.FS
+
+// Called at build time, creates the global asset and animation registries
+var Assets = LoadImages("assets/sprites")
+
+// load pngs and json files
+func LoadImages(dir string) AssetRegistry {
+	Registry := AssetRegistry{}
+
+	// we use embed.FS to iterate over all files in ./assets/
+	entries, err := assetfs.ReadDir(dir)
+	if err != nil {
+		log.Fatalf("failed to read assets dir %s: %s", dir, err)
+	}
+
+	for _, imagefile := range entries {
+		path := path.Join(dir, imagefile.Name())
+
+		fd, err := assetfs.Open(path)
+		if err != nil {
+			log.Fatalf("failed to open file %s: %s", imagefile.Name(), err)
+		}
+		defer fd.Close()
+
+		switch {
+		case strings.HasSuffix(path, ".png"):
+			name, image := ReadImage(imagefile, fd)
+			Registry[name] = image
+		}
+	}
+
+	return Registry
+}
+
+func ReadImage(imagefile fs.DirEntry, fd fs.File) (string, *ebiten.Image) {
+	name := strings.TrimSuffix(imagefile.Name(), ".png")
+
+	img, _, err := image.Decode(fd)
+	if err != nil {
+		log.Fatalf("failed to decode image %s: %s", imagefile.Name(), err)
+	}
+
+	image := ebiten.NewImageFromImage(img)
+
+	return name, image
+}

src/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"runtime/pprof"
+
+	_ "net/http/pprof"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func main() {
+	var directstart bool
+
+	if len(os.Args) > 1 {
+		directstart = true
+	}
+
+	config, err := ParseCommandline()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if config.ShowVersion {
+		fmt.Printf("This is golsky version %s\n", VERSION)
+		os.Exit(0)
+	}
+
+	start := Play
+	if !directstart {
+		start = Menu
+		config.DelayedStart = true
+	}
+	game := NewGame(config, SceneName(start))
+
+	if config.ProfileFile != "" {
+		// enable  cpu profiling. Do  NOT use q  to stop the  game but
+		// close the window to get a profile
+		fd, err := os.Create(config.ProfileFile)
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer fd.Close()
+
+		pprof.StartCPUProfile(fd)
+		defer pprof.StopCPUProfile()
+	}
+
+	// main loop
+	if err := ebiten.RunGame(game); err != nil {
+		log.Fatal(err)
+	}
+}

src/menu.go

@@ -0,0 +1,135 @@
+package main
+
+import (
+	"image/color"
+	"os"
+
+	"github.com/ebitenui/ebitenui"
+	"github.com/ebitenui/ebitenui/widget"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type SceneMenu struct {
+	Game      *Game
+	Config    *Config
+	Next      SceneName
+	Prev      SceneName
+	Whoami    SceneName
+	Ui        *ebitenui.UI
+	FontColor color.RGBA
+	First     bool
+}
+
+func NewMenuScene(game *Game, config *Config) Scene {
+	scene := &SceneMenu{
+		Whoami:    Menu,
+		Game:      game,
+		Next:      Menu,
+		Config:    config,
+		FontColor: color.RGBA{255, 30, 30, 0xff},
+	}
+
+	scene.Init()
+
+	return scene
+}
+
+func (scene *SceneMenu) GetNext() SceneName {
+	return scene.Next
+}
+
+func (scene *SceneMenu) SetPrevious(prev SceneName) {
+	scene.Prev = prev
+}
+
+func (scene *SceneMenu) ResetNext() {
+	scene.Next = scene.Whoami
+}
+
+func (scene *SceneMenu) SetNext(next SceneName) {
+	scene.Next = next
+}
+
+func (scene *SceneMenu) Update() error {
+	scene.Ui.Update()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) || inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		scene.Config.DelayedStart = false
+		scene.Leave()
+	}
+
+	return nil
+
+}
+
+func (scene *SceneMenu) IsPrimary() bool {
+	return false
+}
+
+func (scene *SceneMenu) Draw(screen *ebiten.Image) {
+	scene.Ui.Draw(screen)
+}
+
+func (scene *SceneMenu) Leave() {
+	scene.SetNext(Play)
+}
+
+func (scene *SceneMenu) Init() {
+	rowContainer := NewRowContainer("Main Menu")
+
+	empty := NewMenuButton("Start with empty grid",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.Config.Empty = true
+			scene.Config.Restart = true
+			scene.Leave()
+		})
+
+	random := NewMenuButton("Start with random patterns",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.Config.Empty = false
+			scene.Config.Restart = true
+			scene.Leave()
+		})
+
+	copy := NewMenuButton("Save Copy as RLE",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.Config.Markmode = true
+			scene.Config.Paused = true
+			scene.Leave()
+		})
+
+	options := NewMenuButton("Options",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.SetNext(Options)
+		})
+
+	separator1 := NewSeparator(3)
+	separator2 := NewSeparator(3)
+	separator3 := NewSeparator(10)
+
+	cancel := NewMenuButton("Back",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.Leave()
+		})
+
+	quit := NewMenuButton("Exit Golsky",
+		func(args *widget.ButtonClickedEventArgs) {
+			os.Exit(0)
+		})
+
+	rowContainer.AddChild(empty)
+	rowContainer.AddChild(random)
+	rowContainer.AddChild(separator1)
+	rowContainer.AddChild(options)
+	rowContainer.AddChild(copy)
+	rowContainer.AddChild(separator2)
+	rowContainer.AddChild(cancel)
+	rowContainer.AddChild(separator3)
+	rowContainer.AddChild(quit)
+
+	scene.Ui = &ebitenui.UI{
+		Container: rowContainer.Container(),
+	}
+
+}

src/options.go

@@ -0,0 +1,140 @@
+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 SceneOptions struct {
+	Game      *Game
+	Config    *Config
+	Next      SceneName
+	Prev      SceneName
+	Whoami    SceneName
+	Ui        *ebitenui.UI
+	FontColor color.RGBA
+}
+
+func NewOptionsScene(game *Game, config *Config) Scene {
+	scene := &SceneOptions{
+		Whoami:    Options,
+		Game:      game,
+		Next:      Options,
+		Config:    config,
+		FontColor: color.RGBA{255, 30, 30, 0xff},
+	}
+
+	scene.Init()
+
+	return scene
+}
+
+func (scene *SceneOptions) GetNext() SceneName {
+	return scene.Next
+}
+
+func (scene *SceneOptions) SetPrevious(prev SceneName) {
+	scene.Prev = prev
+}
+
+func (scene *SceneOptions) ResetNext() {
+	scene.Next = scene.Whoami
+}
+
+func (scene *SceneOptions) SetNext(next SceneName) {
+	scene.Next = next
+}
+
+func (scene *SceneOptions) IsPrimary() bool {
+	return false
+}
+
+func (scene *SceneOptions) Update() error {
+	scene.Ui.Update()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) || inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		scene.SetNext(Play)
+	}
+
+	return nil
+
+}
+
+func (scene *SceneOptions) Draw(screen *ebiten.Image) {
+	scene.Ui.Draw(screen)
+}
+
+func (scene *SceneOptions) SetInitialValue(w *widget.LabeledCheckbox, value bool) {
+	var intval int
+	if value {
+		intval = 1
+	}
+
+	w.SetState(
+		widget.WidgetState(intval),
+	)
+}
+
+func (scene *SceneOptions) Init() {
+	rowContainer := NewRowContainer("Options")
+
+	pause := NewCheckbox("Pause",
+		func(args *widget.CheckboxChangedEventArgs) {
+			scene.Config.TogglePaused()
+		})
+
+	debugging := NewCheckbox("Debugging",
+		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",
+		func(args *widget.CheckboxChangedEventArgs) {
+			scene.Config.ToggleGridlines()
+		})
+	scene.SetInitialValue(gridlines, scene.Config.ShowGrid)
+
+	evolution := NewCheckbox("Show evolution traces",
+		func(args *widget.CheckboxChangedEventArgs) {
+			scene.Config.ToggleEvolution()
+		})
+	scene.SetInitialValue(evolution, scene.Config.ShowEvolution)
+
+	wrap := NewCheckbox("Wrap around edges",
+		func(args *widget.CheckboxChangedEventArgs) {
+			scene.Config.ToggleWrap()
+		})
+	scene.SetInitialValue(wrap, scene.Config.Wrap)
+
+	separator := NewSeparator(3)
+
+	cancel := NewMenuButton("Close",
+		func(args *widget.ButtonClickedEventArgs) {
+			scene.SetNext(scene.Prev)
+		})
+
+	rowContainer.AddChild(pause)
+	rowContainer.AddChild(debugging)
+	rowContainer.AddChild(invert)
+	rowContainer.AddChild(gridlines)
+	rowContainer.AddChild(evolution)
+	rowContainer.AddChild(wrap)
+	rowContainer.AddChild(separator)
+	rowContainer.AddChild(cancel)
+
+	scene.Ui = &ebitenui.UI{
+		Container: rowContainer.Container(),
+	}
+
+}

src/play.go

@@ -5,11 +5,8 @@ import (
 	"image"
 	"image/color"
 	"log"
-	"math/rand"
-	"os"
 
 	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/hajimehoshi/ebiten/v2/vector"
 	"github.com/tlinden/golsky/rle"
@@ -20,30 +17,36 @@ type Images struct {
 	Black, White, Age1, Age2, Age3, Age4, Old *ebiten.Image
 }
 
+const (
+	DEBUG_FORMAT = "FPS: %0.2f, TPG: %d, M: %0.2fMB, Generations: %d\nScale: %.02f, Zoom: %d, Cam: %.02f,%.02f Cursor: %d,%d  %s"
+)
+
 type ScenePlay struct {
 	Game   *Game
 	Config *Config
 	Next   SceneName
+	Prev   SceneName
 	Whoami SceneName
 
+	Clear bool
+
 	Grids                                      []*Grid    // 2 grids: one current, one next
-	History                                    *Grid   // holds state of past dead cells for evolution tracks
+	History                                    [][]uint64 // holds state of past dead cells for evolution traces
 	Index                                      int        // points to current grid
-	Generations                                int64   // Stats
+	Generations                                uint64     // 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                                      *ebiten.Image // actual image we render to
+	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
-	Markmode                                   bool          // enabled with 'c'
 	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
-	Paused, RunOneStep                         bool          // mutable flags from config
+	RunOneStep                                 bool          // mutable flags from config
 	TPG                                        int
 }
 
@@ -53,7 +56,6 @@ func NewPlayScene(game *Game, config *Config) Scene {
 		Game:       game,
 		Next:       Play,
 		Config:     config,
-		Paused:     config.Paused,
 		TPG:        config.TPG,
 		RunOneStep: config.RunOneStep,
 	}
@@ -63,10 +65,18 @@ func NewPlayScene(game *Game, config *Config) Scene {
 	return scene
 }
 
+func (scene *ScenePlay) IsPrimary() bool {
+	return true
+}
+
 func (scene *ScenePlay) GetNext() SceneName {
 	return scene.Next
 }
 
+func (scene *ScenePlay) SetPrevious(prev SceneName) {
+	scene.Prev = prev
+}
+
 func (scene *ScenePlay) ResetNext() {
 	scene.Next = scene.Whoami
 }
@@ -75,12 +85,8 @@ func (scene *ScenePlay) SetNext(next SceneName) {
 	scene.Next = next
 }
 
-func (scene *ScenePlay) Clearscreen() bool {
+func (scene *ScenePlay) CheckRule(state uint8, neighbors uint8) uint8 {
-	return true
+	var nextstate uint8
-}
-
-func (scene *ScenePlay) CheckRule(state int64, neighbors int64) int64 {
-	var nextstate int64
 
 	// 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
@@ -126,9 +132,10 @@ func (scene *ScenePlay) UpdateCells() {
 
 			// 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 tracking is enabled
+			// deduce the color to use if evolution tracing is enabled
+			// FIXME: unbranch somehow
 			if state != nextstate {
-				scene.History.Data[y][x] = scene.Generations
+				scene.History[y][x] = scene.Generations
 			}
 		}
 	}
@@ -149,49 +156,60 @@ func (scene *ScenePlay) UpdateCells() {
 }
 
 func (scene *ScenePlay) Reset() {
-	scene.Paused = true
+	scene.Config.Paused = true
-	scene.InitGrid(nil)
+	scene.InitGrid()
-	scene.Paused = false
+	scene.Config.Paused = false
 }
 
 // check user input
-func (scene *ScenePlay) CheckInput() {
+func (scene *ScenePlay) CheckExit() error {
 	if inpututil.IsKeyJustPressed(ebiten.KeyQ) {
-		os.Exit(0)
+		return ebiten.Termination
+	}
+
+	return nil
+}
+
+func (scene *ScenePlay) CheckInput() {
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
+		scene.SetNext(Menu)
+	}
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyO) {
+		scene.SetNext(Options)
 	}
 
 	if inpututil.IsKeyJustPressed(ebiten.KeyC) {
-		fmt.Println("mark mode on")
+		scene.Config.Markmode = true
-		scene.Markmode = true
+		scene.Config.Paused = true
-		scene.Paused = true
 	}
 
-	if scene.Markmode {
+	if scene.Config.Markmode {
 		return
 	}
 
 	if inpututil.IsKeyJustPressed(ebiten.KeySpace) || inpututil.IsKeyJustPressed(ebiten.KeyEnter) {
-		scene.Paused = !scene.Paused
+		scene.Config.TogglePaused()
 	}
 
 	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
 		scene.ToggleCellOnCursorPos(Alive)
-		scene.Paused = true // drawing while running makes no sense
+		scene.Config.Paused = true // drawing while running makes no sense
 	}
 
 	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonRight) {
 		scene.ToggleCellOnCursorPos(Dead)
-		scene.Paused = true // drawing while running makes no sense
+		scene.Config.Paused = true // drawing while running makes no sense
 	}
 
-	if ebiten.IsKeyPressed(ebiten.KeyPageDown) {
+	if inpututil.IsKeyJustPressed(ebiten.KeyPageDown) {
-		if scene.Config.TPG < 120 {
+		if scene.TPG < 120 {
-			scene.Config.TPG++
+			scene.TPG++
 		}
 	}
 
-	if ebiten.IsKeyPressed(ebiten.KeyPageUp) {
+	if inpututil.IsKeyJustPressed(ebiten.KeyPageUp) {
-		if scene.TPG > 1 {
+		if scene.TPG >= 1 {
 			scene.TPG--
 		}
 	}
@@ -200,11 +218,11 @@ func (scene *ScenePlay) CheckInput() {
 		scene.SaveState()
 	}
 
-	if inpututil.IsKeyJustPressed(ebiten.KeyR) {
+	if inpututil.IsKeyJustPressed(ebiten.KeyD) {
-		scene.Reset()
+		scene.Config.Debug = !scene.Config.Debug
 	}
 
-	if scene.Paused {
+	if scene.Config.Paused {
 		if inpututil.IsKeyJustPressed(ebiten.KeyN) {
 			scene.Config.RunOneStep = true
 		}
@@ -214,7 +232,7 @@ func (scene *ScenePlay) CheckInput() {
 // 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() {
-	if scene.Markmode {
+	if scene.Config.Markmode {
 		return
 	}
 
@@ -258,28 +276,12 @@ func (scene *ScenePlay) CheckDraggingInput() {
 
 	// Zoom
 	_, dy := ebiten.Wheel()
-	step := 1
 
-	if scene.WheelTurned {
+	if dy != 0 {
-		// if keep scrolling the wheel, zoom faster
+		scene.Camera.ZoomFactor += (int(dy) * 5)
-		step = 50
-	} else {
-		scene.WheelTurned = false
 	}
 
-	if dy < 0 {
+	if inpututil.IsKeyJustPressed(ebiten.KeyR) {
-		if scene.Camera.ZoomFactor > -2400 {
-			scene.Camera.ZoomFactor -= step
-		}
-	}
-
-	if dy > 0 {
-		if scene.Camera.ZoomFactor < 2400 {
-			scene.Camera.ZoomFactor += step
-		}
-	}
-
-	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
 		scene.Camera.Reset()
 	}
 
@@ -294,10 +296,14 @@ func (scene *ScenePlay) GetWorldCursorPos() image.Point {
 }
 
 func (scene *ScenePlay) CheckMarkInput() {
-	if !scene.Markmode {
+	if !scene.Config.Markmode {
 		return
 	}
 
+	if inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
+		scene.Config.Markmode = false
+	}
+
 	if ebiten.IsMouseButtonPressed(ebiten.MouseButton0) {
 		if !scene.MarkTaken {
 			scene.Mark = scene.GetWorldCursorPos()
@@ -308,7 +314,7 @@ func (scene *ScenePlay) CheckMarkInput() {
 		scene.Point = scene.GetWorldCursorPos()
 		//fmt.Printf("Mark: %v, Point: %v\n", scene.Mark, scene.Point)
 	} else if inpututil.IsMouseButtonJustReleased(ebiten.MouseButton0) {
-		scene.Markmode = false
+		scene.Config.Markmode = false
 		scene.MarkTaken = false
 		scene.MarkDone = true
 
@@ -318,7 +324,7 @@ func (scene *ScenePlay) CheckMarkInput() {
 
 func (scene *ScenePlay) SaveState() {
 	filename := GetFilename(scene.Generations)
-	err := scene.Grids[scene.Index].SaveState(filename)
+	err := scene.Grids[scene.Index].SaveState(filename, scene.Config.Rule.Definition)
 	if err != nil {
 		log.Printf("failed to save game state to %s: %s", filename, err)
 	}
@@ -358,10 +364,10 @@ func (scene *ScenePlay) SaveRectRLE() {
 		height = scene.Mark.Y - scene.Point.Y
 	}
 
-	grid := make([][]int64, height)
+	grid := make([][]uint8, height)
 
 	for y := 0; y < height; y++ {
-		grid[y] = make([]int64, width)
+		grid[y] = make([]uint8, width)
 
 		for x := 0; x < width; x++ {
 			grid[y][x] = scene.Grids[scene.Index].Data[y+starty][x+startx]
@@ -378,11 +384,30 @@ func (scene *ScenePlay) SaveRectRLE() {
 }
 
 func (scene *ScenePlay) Update() error {
+	if scene.Config.Restart {
+		scene.Config.Restart = false
+		scene.Generations = 0
+		scene.InitGrid()
+		scene.InitCache()
+		return nil
+	}
+
+	if scene.Config.RestartCache {
+		scene.Config.RestartCache = false
+		scene.InitTiles()
+		scene.InitCache()
+		return nil
+	}
+
+	if quit := scene.CheckExit(); quit != nil {
+		return quit
+	}
+
 	scene.CheckInput()
 	scene.CheckDraggingInput()
 	scene.CheckMarkInput()
 
-	if !scene.Paused || scene.RunOneStep {
+	if !scene.Config.Paused || scene.RunOneStep {
 		scene.UpdateCells()
 	}
 
@@ -390,17 +415,15 @@ func (scene *ScenePlay) Update() error {
 }
 
 // set a cell to alive or dead
-func (scene *ScenePlay) ToggleCellOnCursorPos(alive int64) {
+func (scene *ScenePlay) ToggleCellOnCursorPos(state uint8) {
 	// 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
 
-	//fmt.Printf("cell at %d,%d\n", x, y)
+	if x > -1 && y > -1 && x < scene.Config.Width && y < scene.Config.Height {
-
+		scene.Grids[scene.Index].Data[y][x] = state
-	if x > -1 && y > -1 {
+		scene.History[y][x] = 1
-		scene.Grids[scene.Index].Data[y][x] = alive
-		scene.History.Data[y][x] = 1
 	}
 }
 
@@ -409,47 +432,34 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 	// we  fill the whole  screen with  a background color,  the cells
 	// themselfes will be 1px smaller as their nominal size, producing
 	// a nice grey grid with grid lines
-	//op := &ebiten.DrawImageOptions{}
+	op := &ebiten.DrawImageOptions{}
-	shaderop := &ebiten.DrawRectShaderOptions{}
 
-	fmt.Println(ebiten.ActualFPS())
+	op.GeoM.Translate(0, 0)
+	scene.World.DrawImage(scene.Cache, op)
 
-	if scene.Config.NoGrid {
+	var age uint64
-		scene.World.Fill(scene.White)
-	} else {
-		scene.World.Fill(scene.Grey)
-	}
 
 	for y := 0; y < scene.Config.Height; y++ {
 		for x := 0; x < scene.Config.Width; x++ {
-			// op.GeoM.Reset()
+			op.GeoM.Reset()
-			// op.GeoM.Translate(float64(x*scene.Config.Cellsize), float64(y*scene.Config.Cellsize))
+			op.GeoM.Translate(
-			// age := scene.Generations - scene.History.Data[y][x]
+				float64(x*scene.Config.Cellsize),
-
+				float64(y*scene.Config.Cellsize),
-			shaderop.GeoM.Reset()
-			shaderop.Uniforms = map[string]any{
-				"Alife": scene.Grids[scene.Index].Data[y][x],
-			}
-
-			shaderop.GeoM.Translate(float64(x*scene.Config.Cellsize), float64(y*scene.Config.Cellsize))
-
-			scene.World.DrawRectShader(
-				scene.Config.Cellsize,
-				scene.Config.Cellsize,
-				scene.Game.Shader,
-				shaderop,
 			)
 
-			/*
+			age = scene.Generations - scene.History[y][x]
+
 			switch scene.Grids[scene.Index].Data[y][x] {
-				case 1:
+			case Alive:
 				if age > 50 && scene.Config.ShowEvolution {
 					scene.World.DrawImage(scene.Tiles.Old, op)
+
 				} else {
 					scene.World.DrawImage(scene.Tiles.Black, op)
 				}
-				case 0:
+			case Dead:
-					if scene.History.Data[y][x] > 1 && scene.Config.ShowEvolution {
+				// 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)
@@ -460,24 +470,30 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 					default:
 						scene.World.DrawImage(scene.Tiles.Age4, op)
 					}
-					} else {
-						scene.World.DrawImage(scene.Tiles.White, op)
 				}
 			}
-			*/
-
 		}
 	}
 
-	if scene.Markmode && scene.MarkTaken {
+	scene.DrawMark(scene.World)
+
+	scene.Camera.Render(scene.World, screen)
+
+	scene.DrawDebug(screen)
+
+	op.GeoM.Reset()
+	op.GeoM.Translate(0, 0)
+
+	scene.Game.Screen.DrawImage(screen, op)
+}
+
+func (scene *ScenePlay) DrawMark(screen *ebiten.Image) {
+	if scene.Config.Markmode && scene.MarkTaken {
 		x := float32(scene.Mark.X * scene.Config.Cellsize)
 		y := float32(scene.Mark.Y * scene.Config.Cellsize)
 		w := float32((scene.Point.X - scene.Mark.X) * scene.Config.Cellsize)
 		h := float32((scene.Point.Y - scene.Mark.Y) * scene.Config.Cellsize)
 
-		// fmt.Printf("%d,%d=>%0.0f,%0.0f to %d,%d=>%0.0f,%0.0f\n",
-		// 	scene.Mark.X, scene.Mark.Y, x, y, scene.Point.X, scene.Point.Y, w, h)
-
 		vector.StrokeRect(
 			scene.World,
 			x+1, y+1,
@@ -485,79 +501,89 @@ func (scene *ScenePlay) Draw(screen *ebiten.Image) {
 			1.0, scene.Old, false,
 		)
 	}
+}
 
-	scene.Camera.Render(scene.World, screen)
+func (scene *ScenePlay) DrawDebug(screen *ebiten.Image) {
-
 	if scene.Config.Debug {
 		paused := ""
-		if scene.Paused {
+		if scene.Config.Paused {
 			paused = "-- paused --"
 		}
 
-		ebitenutil.DebugPrint(
+		if scene.Config.Markmode {
-			screen,
+			paused = "-- mark --"
-			fmt.Sprintf("FPS: %0.2f, TPG: %d, Mem: %0.2f MB, Generations: %d   %s",
-				ebiten.ActualTPS(), scene.TPG, GetMem(), scene.Generations, paused),
-		)
 		}
+
+		x, y := ebiten.CursorPosition()
+		debug := fmt.Sprintf(
+			DEBUG_FORMAT,
+			ebiten.ActualTPS(), scene.TPG, GetMem(), scene.Generations,
+			scene.Game.Scale, scene.Camera.ZoomFactor,
+			scene.Camera.Position[0], scene.Camera.Position[1],
+			x, y,
+			paused)
+
+		FontRenderer.Renderer.SetSizePx(10 + int(scene.Game.Scale*10))
+		FontRenderer.Renderer.SetTarget(screen)
+
+		FontRenderer.Renderer.SetColor(scene.Black)
+		FontRenderer.Renderer.Draw(debug, 31, 31)
+
+		FontRenderer.Renderer.SetColor(scene.Old)
+		FontRenderer.Renderer.Draw(debug, 30, 30)
+
+		fmt.Println(debug)
+	}
+
 }
 
-// FIXME: move these into Grid
 // load a pre-computed pattern from RLE file
 func (scene *ScenePlay) InitPattern() {
-	if scene.Config.RLE != nil {
+	scene.Grids[0].LoadRLE(scene.Config.RLE)
-		startX := (scene.Config.Width / 2) - (scene.Config.RLE.Width / 2)
+}
-		startY := (scene.Config.Height / 2) - (scene.Config.RLE.Height / 2)
-		var y, x int
 
-		for rowIndex, patternRow := range scene.Config.RLE.Pattern {
+// pre-render offscreen cache image
-			for colIndex := range patternRow {
+func (scene *ScenePlay) InitCache() {
-				if scene.Config.RLE.Pattern[rowIndex][colIndex] > 0 {
+	op := &ebiten.DrawImageOptions{}
-					x = colIndex + startX
-					y = rowIndex + startY
 
-					scene.History.Data[y][x] = 1
+	if scene.Config.ShowGrid {
-					scene.Grids[0].Data[y][x] = 1
+		scene.Cache.Fill(scene.Grey)
-				}
+	} else {
+		scene.Cache.Fill(scene.White)
 	}
+
+	for y := 0; y < scene.Config.Height; y++ {
+		for x := 0; x < scene.Config.Width; x++ {
+			op.GeoM.Reset()
+			op.GeoM.Translate(
+				float64(x*scene.Config.Cellsize),
+				float64(y*scene.Config.Cellsize),
+			)
+
+			scene.Cache.DrawImage(scene.Tiles.White, op)
 		}
 	}
 }
 
-func (scene *ScenePlay) InitGrid(grid *Grid) {
+// initialize grid[s], either using pre-computed from state or rle file, or random
-	if grid != nil {
+func (scene *ScenePlay) InitGrid() {
-		// use pre-loaded grid
-		scene.Grids = []*Grid{
-			grid,
-			NewGrid(grid.Width, grid.Height, 0, false),
-		}
-
-		scene.History = NewGrid(grid.Width, grid.Height, 0, false)
-
-		return
-	}
-
 	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)
 
-	for y := 0; y < scene.Config.Height; y++ {
+	// startup is delayed until user has selected options
-		if !scene.Config.Empty {
+	grida.FillRandom()
-			for x := 0; x < scene.Config.Width; x++ {
+	grida.Copy(history)
-				if rand.Intn(scene.Config.Density) == 1 {
-					history.Data[y][x] = 1
-					grida.Data[y][x] = 1
-				}
-			}
-		}
-	}
 
 	scene.Grids = []*Grid{
 		grida,
 		gridb,
 	}
 
-	scene.History = history
+	scene.History = make([][]uint64, scene.Config.Height)
+	for y := 0; y < scene.Config.Height; y++ {
+		scene.History[y] = make([]uint64, scene.Config.Width)
+	}
 }
 
 // prepare tile images
@@ -603,35 +629,57 @@ func (scene *ScenePlay) InitTiles() {
 
 func (scene *ScenePlay) Init() {
 	// setup the scene
-	var grid *Grid
-
-	if scene.Config.StateGrid != nil {
-		grid = scene.Config.StateGrid
-
-	}
-
 	scene.Camera = Camera{
 		ViewPort: f64.Vec2{
 			float64(scene.Config.ScreenWidth),
 			float64(scene.Config.ScreenHeight),
 		},
+		InitialZoomFactor: scene.Config.Zoomfactor,
+		InitialPosition: f64.Vec2{
+			scene.Config.InitialCamPos[0],
+			scene.Config.InitialCamPos[1],
+		},
+		ZoomOutFactor: scene.Config.ZoomOutFactor,
 	}
 
-	scene.World = ebiten.NewImage(scene.Config.ScreenWidth, scene.Config.ScreenHeight)
+	scene.World = ebiten.NewImage(
+		scene.Config.Width*scene.Config.Cellsize,
+		scene.Config.Height*scene.Config.Cellsize,
+	)
+
+	scene.Cache = ebiten.NewImage(
+		scene.Config.Width*scene.Config.Cellsize,
+		scene.Config.Height*scene.Config.Cellsize,
+	)
 
-	scene.InitGrid(grid)
-	scene.InitPattern()
 	scene.InitTiles()
+	scene.InitCache()
+
+	if scene.Config.DelayedStart && !scene.Config.Empty {
+		scene.Config.Empty = true
+		scene.InitGrid()
+		scene.Config.Empty = false
+	} else {
+		scene.InitGrid()
+	}
+
+	scene.InitPattern()
 
 	scene.Index = 0
 	scene.TicksElapsed = 0
 
 	scene.LastCursorPos = make([]int, 2)
+
+	if scene.Config.Zoomfactor < 0 || scene.Config.Zoomfactor > 0 {
+		scene.Camera.ZoomFactor = scene.Config.Zoomfactor
+	}
+
+	scene.Camera.Setup()
 }
 
 // count the living neighbors of a cell
-func (scene *ScenePlay) CountNeighbors(x, y int) int64 {
+func (scene *ScenePlay) CountNeighbors(x, y int) uint8 {
-	var sum int64
+	var sum uint8
 
 	for nbgX := -1; nbgX < 2; nbgX++ {
 		for nbgY := -1; nbgY < 2; nbgY++ {
@@ -669,8 +717,8 @@ func FillCell(tile *ebiten.Image, cellsize int, col color.RGBA) {
 		tile,
 		float32(1),
 		float32(1),
-		float32(cellsize-1),
+		float32(cellsize),
-		float32(cellsize-1),
+		float32(cellsize),
 		col, false,
 	)
 }

src/rule.go

@@ -9,22 +9,22 @@ import (
 // a GOL rule
 type Rule struct {
 	Definition string
-	Birth      []int64
+	Birth      []uint8
-	Death      []int64
+	Death      []uint8
 }
 
 // parse one part of a GOL rule into rule slice
-func NumbersToList(numbers string) []int64 {
+func NumbersToList(numbers string) []uint8 {
-	list := []int64{}
+	list := []uint8{}
 
 	items := strings.Split(numbers, "")
 	for _, item := range items {
-		num, err := strconv.ParseInt(item, 10, 64)
+		num, err := strconv.ParseInt(item, 10, 8)
 		if err != nil {
 			log.Fatalf("failed to parse game rule part <%s>: %s", numbers, err)
 		}
 
-		list = append(list, num)
+		list = append(list, uint8(num))
 	}
 
 	return list

src/scene.go

@@ -13,13 +13,15 @@ type SceneName int
 type Scene interface {
 	SetNext(SceneName)
 	GetNext() SceneName
+	SetPrevious(SceneName)
 	ResetNext()
-	Clearscreen() bool
 	Update() error
 	Draw(screen *ebiten.Image)
+	IsPrimary() bool // if true, this scene will be always drawn
 }
 
 const (
 	Menu = iota // main top level menu
 	Play        // actual playing happens here
+	Options
 )

src/widgets.go

@@ -0,0 +1,161 @@
+package main
+
+import (
+	"image/color"
+
+	"github.com/ebitenui/ebitenui/image"
+	"github.com/ebitenui/ebitenui/widget"
+)
+
+func NewMenuButton(
+	text string,
+	action func(args *widget.ButtonClickedEventArgs)) *widget.Button {
+
+	buttonImage, _ := LoadButtonImage()
+
+	return widget.NewButton(
+		widget.ButtonOpts.WidgetOpts(
+			widget.WidgetOpts.LayoutData(widget.RowLayoutData{
+				Position:  widget.RowLayoutPositionCenter,
+				Stretch:   true,
+				MaxWidth:  200,
+				MaxHeight: 100,
+			}),
+		),
+
+		widget.ButtonOpts.Image(buttonImage),
+
+		widget.ButtonOpts.Text(text, *FontRenderer.FontSmall, &widget.ButtonTextColor{
+			Idle: color.NRGBA{0xdf, 0xf4, 0xff, 0xff},
+		}),
+
+		widget.ButtonOpts.TextPadding(widget.Insets{
+			Left:   5,
+			Right:  5,
+			Top:    5,
+			Bottom: 5,
+		}),
+
+		widget.ButtonOpts.ClickedHandler(action),
+	)
+}
+
+func NewCheckbox(
+	text string,
+	action func(args *widget.CheckboxChangedEventArgs)) *widget.LabeledCheckbox {
+
+	checkboxImage, _ := LoadCheckboxImage()
+	buttonImage, _ := LoadButtonImage()
+
+	return widget.NewLabeledCheckbox(
+		widget.LabeledCheckboxOpts.CheckboxOpts(
+			widget.CheckboxOpts.ButtonOpts(
+				widget.ButtonOpts.Image(buttonImage),
+			),
+			widget.CheckboxOpts.Image(checkboxImage),
+			widget.CheckboxOpts.StateChangedHandler(action),
+		),
+		widget.LabeledCheckboxOpts.LabelOpts(
+			widget.LabelOpts.Text(text, *FontRenderer.FontSmall,
+				&widget.LabelColor{
+					Idle: color.NRGBA{0xdf, 0xf4, 0xff, 0xff},
+				}),
+		),
+	)
+}
+
+func NewSeparator(padding int) widget.PreferredSizeLocateableWidget {
+	c := widget.NewContainer(
+		widget.ContainerOpts.Layout(widget.NewRowLayout(
+			widget.RowLayoutOpts.Direction(widget.DirectionVertical),
+			widget.RowLayoutOpts.Padding(widget.Insets{
+				Top:    padding,
+				Bottom: 0,
+			}))),
+		widget.ContainerOpts.WidgetOpts(
+			widget.WidgetOpts.LayoutData(
+				widget.RowLayoutData{Stretch: true})))
+	return c
+}
+
+type RowContainer struct {
+	Root *widget.Container
+	Row  *widget.Container
+}
+
+func (container *RowContainer) AddChild(child widget.PreferredSizeLocateableWidget) {
+	container.Row.AddChild(child)
+}
+
+func (container *RowContainer) Container() *widget.Container {
+	return container.Root
+}
+
+// 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})
+
+	uiContainer := widget.NewContainer(
+		widget.ContainerOpts.Layout(widget.NewAnchorLayout()),
+	)
+
+	titleLabel := widget.NewText(
+		widget.TextOpts.WidgetOpts(widget.WidgetOpts.LayoutData(widget.RowLayoutData{
+			Stretch: true,
+		})),
+		widget.TextOpts.Text(title, *FontRenderer.FontNormal, color.NRGBA{0xdf, 0xf4, 0xff, 0xff}))
+
+	rowContainer := widget.NewContainer(
+		widget.ContainerOpts.WidgetOpts(
+			widget.WidgetOpts.LayoutData(widget.AnchorLayoutData{
+				HorizontalPosition: widget.AnchorLayoutPositionCenter,
+				VerticalPosition:   widget.AnchorLayoutPositionCenter,
+			}),
+		),
+		widget.ContainerOpts.Layout(widget.NewRowLayout(
+			widget.RowLayoutOpts.Direction(widget.DirectionVertical),
+			widget.RowLayoutOpts.Padding(widget.NewInsetsSimple(8)),
+			widget.RowLayoutOpts.Spacing(0),
+		)),
+		widget.ContainerOpts.BackgroundImage(buttonImageHover),
+	)
+
+	rowContainer.AddChild(titleLabel)
+
+	uiContainer.AddChild(rowContainer)
+
+	return &RowContainer{
+		Root: uiContainer,
+		Row:  rowContainer,
+	}
+}
+
+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})
+	pressed := image.NewNineSlice(Assets["button-9slice1"], [3]int{3, 3, 3}, [3]int{3, 3, 3})
+
+	return &widget.ButtonImage{
+		Idle:    idle,
+		Hover:   hover,
+		Pressed: pressed,
+	}, nil
+}
+
+func LoadCheckboxImage() (*widget.CheckboxGraphicImage, error) {
+	unchecked := &widget.ButtonImageImage{
+		Idle:     Assets["checkbox-9slice2"],
+		Disabled: Assets["checkbox-9slice2"],
+	}
+
+	checked := &widget.ButtonImageImage{
+		Idle:     Assets["checkbox-9slice1"],
+		Disabled: Assets["checkbox-9slice1"],
+	}
+
+	return &widget.CheckboxGraphicImage{
+		Checked:   checked,
+		Unchecked: unchecked,
+		Greyed:    unchecked,
+	}, nil
+}

various-tests/drawtriangles/go.mod

@@ -0,0 +1,13 @@
+module drawminimal
+
+go 1.22
+
+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/hajimehoshi/ebiten/v2 v2.7.4 // indirect
+	github.com/jezek/xgb v1.1.1 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+)

various-tests/drawtriangles/go.sum

@@ -0,0 +1,14 @@
+github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895 h1:48bCqKTuD7Z0UovDfvpCn7wZ0GUZ+yosIteNDthn3FU=
+github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895/go.mod h1:XZdLv05c5hOZm3fM2NlJ92FyEZjnslcMcNRrhxs8+8M=
+github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj1yReDqE=
+github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
+github.com/ebitengine/purego v0.7.0 h1:HPZpl61edMGCEW6XK2nsR6+7AnJ3unUxpTZBkkIXnMc=
+github.com/ebitengine/purego v0.7.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/hajimehoshi/ebiten/v2 v2.7.4 h1:X+heODRQ3Ie9F9QFjm24gEZqQd5FSfR9XuT2XfHwgf8=
+github.com/hajimehoshi/ebiten/v2 v2.7.4/go.mod h1:H2pHVgq29rfm5yeQ7jzWOM3VHsjo7/AyucODNLOhsVY=
+github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
+github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

various-tests/drawtriangles/main.go

@@ -0,0 +1,362 @@
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"log"
+	"math/rand"
+	"os"
+	"runtime/pprof"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+var (
+	blackImage    = ebiten.NewImage(3, 3)
+	blackSubImage = blackImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
+)
+
+type Images struct {
+	Black, White *ebiten.Image
+}
+
+type Grid struct {
+	Data                   [][]int64
+	Width, Height, Density int
+}
+
+// Create new empty grid and allocate Data according to provided dimensions
+func NewGrid(width, height, density int) *Grid {
+	grid := &Grid{
+		Height:  height,
+		Width:   width,
+		Density: density,
+		Data:    make([][]int64, height),
+	}
+
+	for y := 0; y < height; y++ {
+		grid.Data[y] = make([]int64, width)
+	}
+
+	return grid
+}
+
+// live console output of the grid
+func (grid *Grid) Dump() {
+	/*
+		cmd := exec.Command("clear")
+		cmd.Stdout = os.Stdout
+		cmd.Run()
+
+		for y := 0; y < grid.Height; y++ {
+			for x := 0; x < grid.Width; x++ {
+				if grid.Data[y][x] == 1 {
+					fmt.Print("XX")
+				} else {
+					fmt.Print("  ")
+				}
+			}
+			fmt.Println()
+		}
+	*/
+	fmt.Printf("FPS: %0.2f\n", ebiten.ActualTPS())
+}
+
+type Game struct {
+	Width, Height, Cellsize, Density int
+	ScreenWidth, ScreenHeight        int
+	Grids                            []*Grid
+	Index                            int
+	Black, White, Grey               color.RGBA
+	Tiles                            Images
+	Cache                            *ebiten.Image
+	Elapsed                          int64
+	TPG                              int64 // adjust game speed independently of TPS
+	Vertices                         []ebiten.Vertex
+	Indices                          []uint16
+	Pause, Debug                     bool
+}
+
+// fill a cell
+func FillCell(tile *ebiten.Image, cellsize int, col color.RGBA) {
+	vector.DrawFilledRect(
+		tile,
+		float32(1),
+		float32(1),
+		float32(cellsize-1),
+		float32(cellsize-1),
+		col, false,
+	)
+}
+
+func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return game.ScreenWidth, game.ScreenHeight
+}
+
+func (game *Game) Init() {
+	// setup two grids, one for display, one for next state
+	grida := NewGrid(game.Width, game.Height, game.Density)
+	gridb := NewGrid(game.Width, game.Height, game.Density)
+
+	for y := 0; y < game.Height; y++ {
+		for x := 0; x < game.Width; x++ {
+			if rand.Intn(game.Density) == 1 {
+				grida.Data[y][x] = 1
+			}
+		}
+
+	}
+
+	game.Grids = []*Grid{
+		grida,
+		gridb,
+	}
+
+	// setup colors
+	game.Grey = color.RGBA{128, 128, 128, 0xff}
+	game.Black = color.RGBA{0, 0, 0, 0xff}
+	game.White = color.RGBA{200, 200, 200, 0xff}
+
+	game.Tiles.White = ebiten.NewImage(game.Cellsize, game.Cellsize)
+	game.Cache = ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
+
+	FillCell(game.Tiles.White, game.Cellsize, game.White)
+	game.Cache.Fill(game.Grey)
+
+	// draw the offscreen image
+	op := &ebiten.DrawImageOptions{}
+	for y := 0; y < game.Height; y++ {
+		for x := 0; x < game.Width; x++ {
+			op.GeoM.Reset()
+			op.GeoM.Translate(float64(x*game.Cellsize), float64(y*game.Cellsize))
+			game.Cache.DrawImage(game.Tiles.White, op)
+		}
+	}
+
+	blackSubImage.Fill(game.Black)
+
+	lenvertices := game.ScreenHeight * game.ScreenWidth
+	game.Vertices = make([]ebiten.Vertex, lenvertices)
+	game.Indices = make([]uint16, lenvertices+(lenvertices/2))
+}
+
+// count the living neighbors of a cell
+func (game *Game) CountNeighbors(x, y int) int64 {
+	var sum int64
+
+	for nbgX := -1; nbgX < 2; nbgX++ {
+		for nbgY := -1; nbgY < 2; nbgY++ {
+			var col, row int
+
+			// Wrap  mode we look  at all the 8  neighbors surrounding
+			//  us.  In  case we  are  on an  edge we'll  look at  the
+			// neighbor on  the other side of the  grid, thus wrapping
+			// lookahead around using the mod() function.
+			col = (x + nbgX + game.Width) % game.Width
+			row = (y + nbgY + game.Height) % game.Height
+
+			sum += game.Grids[game.Index].Data[row][col]
+		}
+	}
+
+	// don't count ourselfes though
+	sum -= game.Grids[game.Index].Data[y][x]
+
+	return sum
+}
+
+// the heart of the game
+func (game *Game) CheckRule(state int64, neighbors int64) int64 {
+	var nextstate int64
+
+	if state == 0 && neighbors == 3 {
+		nextstate = 1
+	} else if state == 1 && (neighbors == 2 || neighbors == 3) {
+		nextstate = 1
+	} else {
+		nextstate = 0
+	}
+
+	return nextstate
+}
+
+// we only  update the cells if  we are not  in pause state or  if the
+// game timer (TPG) is elapsed.
+func (game *Game) UpdateCells() {
+	if game.Pause {
+		return
+	}
+
+	if game.Elapsed < game.TPG {
+		game.Elapsed++
+		return
+	}
+
+	// next grid index. we only have to, so we just xor it
+	next := game.Index ^ 1
+
+	// reset vertices
+	// FIXME: fails!
+	game.ClearVertices()
+
+	// calculate cell life state, this is the actual game of life
+	for y := 0; y < game.Height; y++ {
+		for x := 0; x < game.Width; x++ {
+			state := game.Grids[game.Index].Data[y][x] // 0|1 == dead or alive
+			neighbors := game.CountNeighbors(x, y)     // alive neighbor count
+
+			// actually apply the current rules
+			nextstate := game.CheckRule(state, neighbors)
+
+			// change state of current cell in next grid
+			game.Grids[next].Data[y][x] = nextstate
+		}
+	}
+
+	// calculate triangles for rendering
+	game.UpdateTriangles()
+
+	// switch grid for rendering
+	game.Index ^= 1
+
+	game.Elapsed = 0
+
+	if game.Debug {
+		game.Grids[next].Dump()
+	}
+}
+
+func (game *Game) Update() error {
+	game.UpdateCells()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
+		game.Pause = !game.Pause
+	}
+
+	return nil
+}
+
+func (game *Game) ClearVertices() {
+	// FIXME: fails
+	for i := 0; i < len(game.Vertices); i++ {
+		game.Vertices[i] = ebiten.Vertex{}
+		// game.Vertices[i].DstX = 0
+		// game.Vertices[i].DstY = 1
+	}
+
+	game.Indices = game.Indices[:len(game.Indices)]
+}
+
+// create the triangles needed for rendering. Actual rendering doesn't
+// happen here but in Draw()
+func (game *Game) UpdateTriangles() {
+	var base uint16 = 0
+	var index uint16 = 0
+
+	idx := 0
+
+	// iterate over every cell
+	for celly := 0; celly < game.Height; celly++ {
+		for cellx := 0; cellx < game.Width; cellx++ {
+
+			// if the cell is alife
+			if game.Grids[game.Index].Data[celly][cellx] == 1 {
+
+				/* iterate over the cell's corners:
+				0   1
+
+				2   3
+				*/
+				for i := 0; i < 2; i++ {
+					for j := 0; j < 2; j++ {
+
+						// calculate the corner position
+						x := (cellx * game.Cellsize) + (i * game.Cellsize) + 1
+						y := (celly * game.Cellsize) + (j * game.Cellsize) + 1
+
+						if i == 1 {
+							x -= 1
+						}
+						if j == 1 {
+							y -= 1
+						}
+
+						// setup the vertex
+						game.Vertices[idx].DstX = float32(x)
+						game.Vertices[idx].DstY = float32(y)
+						game.Vertices[idx].SrcX = 1
+						game.Vertices[idx].SrcY = 1
+						game.Vertices[idx].ColorR = float32(game.Black.R)
+						game.Vertices[idx].ColorG = float32(game.Black.G)
+						game.Vertices[idx].ColorB = float32(game.Black.B)
+						game.Vertices[idx].ColorA = 1
+
+						idx++
+					}
+				}
+			}
+
+			// indices for first triangle
+			game.Indices[index] = base
+			game.Indices[index+1] = base + 1
+			game.Indices[index+2] = base + 3
+
+			// for the second one
+			game.Indices[index+3] = base
+			game.Indices[index+4] = base + 2
+			game.Indices[index+5] = base + 3
+
+			index += 6 // 3 indicies per triangle
+
+			base += 4 // 4 vertices per cell
+		}
+	}
+}
+
+func (game *Game) Draw(screen *ebiten.Image) {
+	op := &ebiten.DrawImageOptions{}
+
+	op.GeoM.Translate(0, 0)
+	screen.DrawImage(game.Cache, op)
+
+	triop := &ebiten.DrawTrianglesOptions{}
+	screen.DrawTriangles(game.Vertices, game.Indices, blackSubImage, triop)
+}
+
+func main() {
+	size := 200
+
+	game := &Game{
+		Width:    size,
+		Height:   size,
+		Cellsize: 4,
+		Density:  5,
+		TPG:      5,
+		Debug:    true,
+	}
+
+	game.ScreenWidth = game.Width * game.Cellsize
+	game.ScreenHeight = game.Height * game.Cellsize
+
+	game.Init()
+
+	ebiten.SetWindowSize(game.ScreenWidth, game.ScreenHeight)
+	ebiten.SetWindowTitle("triangle conway's game of life")
+	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
+
+	fd, err := os.Create("cpu.profile")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fd.Close()
+
+	pprof.StartCPUProfile(fd)
+	defer pprof.StopCPUProfile()
+
+	if err := ebiten.RunGame(game); err != nil {
+		log.Fatal(err)
+	}
+}

various-tests/writepixel/go.mod

@@ -0,0 +1,13 @@
+module testgol
+
+go 1.22
+
+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/hajimehoshi/ebiten/v2 v2.7.4 // indirect
+	github.com/jezek/xgb v1.1.1 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+)

various-tests/writepixel/go.sum

@@ -0,0 +1,14 @@
+github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895 h1:48bCqKTuD7Z0UovDfvpCn7wZ0GUZ+yosIteNDthn3FU=
+github.com/ebitengine/gomobile v0.0.0-20240518074828-e86332849895/go.mod h1:XZdLv05c5hOZm3fM2NlJ92FyEZjnslcMcNRrhxs8+8M=
+github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj1yReDqE=
+github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
+github.com/ebitengine/purego v0.7.0 h1:HPZpl61edMGCEW6XK2nsR6+7AnJ3unUxpTZBkkIXnMc=
+github.com/ebitengine/purego v0.7.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/hajimehoshi/ebiten/v2 v2.7.4 h1:X+heODRQ3Ie9F9QFjm24gEZqQd5FSfR9XuT2XfHwgf8=
+github.com/hajimehoshi/ebiten/v2 v2.7.4/go.mod h1:H2pHVgq29rfm5yeQ7jzWOM3VHsjo7/AyucODNLOhsVY=
+github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
+github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

various-tests/writepixel/main.go

@@ -0,0 +1,288 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"os/exec"
+	"runtime/pprof"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type Images struct {
+	Black, White *ebiten.Image
+}
+
+type Grid struct {
+	Data                   [][]int64
+	Width, Height, Density int
+}
+
+// Create new empty grid and allocate Data according to provided dimensions
+func NewGrid(width, height, density int) *Grid {
+	grid := &Grid{
+		Height:  height,
+		Width:   width,
+		Density: density,
+		Data:    make([][]int64, height),
+	}
+
+	for y := 0; y < height; y++ {
+		grid.Data[y] = make([]int64, width)
+	}
+
+	return grid
+}
+
+type Game struct {
+	Width, Height, Cellsize, Density int
+	ScreenWidth, ScreenHeight        int
+	Grids                            []*Grid
+	Index                            int
+	Elapsed                          int64
+	TPG                              int64 // adjust game speed independently of TPS
+	Pause, Debug, Profile, Gridlines bool
+	Pixels                           []byte
+	OffScreen                        *ebiten.Image
+}
+
+func (game *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return game.ScreenWidth, game.ScreenHeight
+}
+
+// live console output of the grid
+func (game *Game) DebugDump() {
+	cmd := exec.Command("clear")
+	cmd.Stdout = os.Stdout
+	cmd.Run()
+
+	if game.Debug {
+		for y := 0; y < game.Height; y++ {
+			for x := 0; x < game.Width; x++ {
+				if game.Grids[game.Index].Data[y][x] == 1 {
+					fmt.Print("XX")
+				} else {
+					fmt.Print("  ")
+				}
+			}
+			fmt.Println()
+		}
+	}
+	fmt.Printf("FPS: %0.2f\n", ebiten.ActualTPS())
+}
+
+func (game *Game) Init() {
+	// setup two grids, one for display, one for next state
+	grida := NewGrid(game.Width, game.Height, game.Density)
+	gridb := NewGrid(game.Width, game.Height, game.Density)
+
+	for y := 0; y < game.Height; y++ {
+		for x := 0; x < game.Width; x++ {
+			if rand.Intn(game.Density) == 1 {
+				grida.Data[y][x] = 1
+			}
+		}
+
+	}
+
+	game.Grids = []*Grid{
+		grida,
+		gridb,
+	}
+
+	game.Pixels = make([]byte, game.ScreenWidth*game.ScreenHeight*4)
+
+	game.OffScreen = ebiten.NewImage(game.ScreenWidth, game.ScreenHeight)
+}
+
+// count the living neighbors of a cell
+func (game *Game) CountNeighbors(x, y int) int64 {
+	var sum int64
+
+	for nbgX := -1; nbgX < 2; nbgX++ {
+		for nbgY := -1; nbgY < 2; nbgY++ {
+			var col, row int
+
+			// Wrap  mode we look  at all the 8  neighbors surrounding
+			//  us.  In  case we  are  on an  edge we'll  look at  the
+			// neighbor on  the other side of the  grid, thus wrapping
+			// lookahead around using the mod() function.
+			col = (x + nbgX + game.Width) % game.Width
+			row = (y + nbgY + game.Height) % game.Height
+
+			sum += game.Grids[game.Index].Data[row][col]
+		}
+	}
+
+	// don't count ourselfes though
+	sum -= game.Grids[game.Index].Data[y][x]
+
+	return sum
+}
+
+// the heart of the game
+func (game *Game) CheckRule(state int64, neighbors int64) int64 {
+	var nextstate int64
+
+	if state == 0 && neighbors == 3 {
+		nextstate = 1
+	} else if state == 1 && (neighbors == 2 || neighbors == 3) {
+		nextstate = 1
+	} else {
+		nextstate = 0
+	}
+
+	return nextstate
+}
+
+// we only  update the cells if  we are not  in pause state or  if the
+// game timer (TPG) is elapsed.
+func (game *Game) UpdateCells() {
+	if game.Pause {
+		return
+	}
+
+	if game.Elapsed < game.TPG {
+		game.Elapsed++
+		return
+	}
+
+	// next grid index. we only have to, so we just xor it
+	next := game.Index ^ 1
+
+	// calculate cell life state, this is the actual game of life
+	for y := 0; y < game.Height; y++ {
+		for x := 0; x < game.Width; x++ {
+			state := game.Grids[game.Index].Data[y][x] // 0|1 == dead or alive
+			neighbors := game.CountNeighbors(x, y)     // alive neighbor count
+
+			// actually apply the current rules
+			nextstate := game.CheckRule(state, neighbors)
+
+			// change state of current cell in next grid
+			game.Grids[next].Data[y][x] = nextstate
+		}
+	}
+
+	// switch grid for rendering
+	game.Index ^= 1
+
+	game.Elapsed = 0
+
+	game.UpdatePixels()
+}
+
+func (game *Game) Update() error {
+	game.UpdateCells()
+
+	if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
+		game.Pause = !game.Pause
+	}
+
+	return nil
+}
+
+/*
+*
+r, g, b := color(it)
+
+	78             p := 4 * (i + j*screenWidth)
+	79             gm.offscreenPix[p] = r
+	80             gm.offscreenPix[p+1] = g
+	81             gm.offscreenPix[p+2] = b
+	82             gm.offscreenPix[p+3] = 0xff
+*/
+func (game *Game) UpdatePixels() {
+	var col byte
+
+	gridx := 0
+	gridy := 0
+	idx := 0
+
+	for y := 0; y < game.ScreenHeight; y++ {
+		for x := 0; x < game.ScreenWidth; x++ {
+			gridx = x / game.Cellsize
+			gridy = y / game.Cellsize
+
+			col = 0xff
+			if game.Grids[game.Index].Data[gridy][gridx] == 1 {
+				col = 0x0
+			}
+
+			if game.Gridlines {
+				if x%game.Cellsize == 0 || y%game.Cellsize == 0 {
+					col = 128
+				}
+			}
+
+			idx = 4 * (x + y*game.ScreenWidth)
+
+			game.Pixels[idx] = col
+			game.Pixels[idx+1] = col
+			game.Pixels[idx+2] = col
+			game.Pixels[idx+3] = 0xff
+
+			idx++
+		}
+	}
+
+	game.OffScreen.WritePixels(game.Pixels)
+}
+
+func (game *Game) Draw(screen *ebiten.Image) {
+	screen.DrawImage(game.OffScreen, nil)
+	game.DebugDump()
+}
+
+func main() {
+	// state := 1
+	// nextstate := 0
+	v := 0
+
+	for i := 0; i < 600; i++ {
+		v = ((v + 1) & 255)
+		fmt.Println(i, i&255)
+	}
+}
+
+func _main() {
+	size := 800
+
+	game := &Game{
+		Width:     size,
+		Height:    size,
+		Cellsize:  4,
+		Density:   8,
+		TPG:       10,
+		Debug:     false,
+		Profile:   false,
+		Gridlines: false,
+	}
+
+	game.ScreenWidth = game.Width * game.Cellsize
+	game.ScreenHeight = game.Height * game.Cellsize
+
+	game.Init()
+
+	ebiten.SetWindowSize(game.ScreenWidth, game.ScreenHeight)
+	ebiten.SetWindowTitle("triangle conway's game of life")
+	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
+
+	if game.Profile {
+		fd, err := os.Create("cpu.profile")
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer fd.Close()
+
+		pprof.StartCPUProfile(fd)
+		defer pprof.StopCPUProfile()
+	}
+
+	if err := ebiten.RunGame(game); err != nil {
+		log.Fatal(err)
+	}
+}