added primary and secondary player mode

TODO.md

@@ -31,3 +31,5 @@ if inpututil.IsKeyJustPressed(ebiten.KeyS) {
 - Calculate obstacle collision the same as solid collision with future
   velocity and  included snap in so  that the player ends  up right on
   the edge of the obstacle and not inside as it is now
+  
+- Check player-player collisions! 

assets/levels/04-mayhem.lvl

@@ -0,0 +1,17 @@
+Description: use multiple players
+Background: background-lila
+                    
+                    
+                    
+                    
+     ##########     
+    #         v#    
+    #          #    
+    #S        s#    
+    #          #    
+    #^         #    
+     ##########     
+                    
+                    
+                    
+                    

assets/loader-levels.go

@@ -27,6 +27,7 @@ type Tile struct {
 	Class       string
 	Solid       bool
 	Player      bool
+	IsPrimary   bool
 	Renderable  bool
 	Velocity    bool
 	Collectible bool
@@ -38,15 +39,32 @@ type Tile struct {
 	Direction   int // obstacles
 }
 
-func NewTilePlayer() *Tile {
+const (
-	return &Tile{
+	Primary   bool = true
+	Secondary bool = false
+)
+
+func NewTilePlayer(isprimary bool) *Tile {
+	tile := &Tile{
 		Id:         'S',
-		Sprite:     Assets["sphere-blue"],
 		Class:      "sphere",
 		Renderable: true,
 		Player:     true,
 		Velocity:   true,
+		IsPrimary:  isprimary,
 	}
+
+	switch isprimary {
+	case Primary:
+		tile.Sprite = Assets["sphere-blue"]
+	case Secondary:
+		tile.Sprite = Assets["sphere-blue-secondary"]
+		tile.Id = 's'
+	}
+
+	// primary sprite is always the first one
+	tile.Tiles = []*ebiten.Image{Assets["sphere-blue"], Assets["sphere-blue-secondary"]}
+	return tile
 }
 
 func NewTileBlock(class string) *Tile {
@@ -148,7 +166,8 @@ func InitTiles() TileRegistry {
 		' ': {Id: ' ', Class: "floor", Renderable: false},
 		'#': NewTileBlock("block-grey32"),
 		'B': NewTileBlock("block-orange-32"),
-		'S': NewTilePlayer(),
+		'S': NewTilePlayer(Primary),
+		's': NewTilePlayer(Secondary),
 		'o': NewTileCollectible("collectible-orange"),
 		'+': NewTileObstacle("obstacle-star", config.All),
 		'^': NewTileObstacle("obstacle-north", config.North),

components/components.go

@@ -24,7 +24,6 @@ type Speed struct {
 type Tilish struct{}
 type Solid struct{}
 type Floor struct{}
-type Player struct{}
 type Collectible struct{}
 
 type Obstacle struct {

components/player.go

@@ -0,0 +1,16 @@
+package components
+
+import "github.com/hajimehoshi/ebiten/v2"
+
+type Player struct {
+	IsPrimary bool
+	Sprites   []*ebiten.Image
+}
+
+func (player *Player) SwitchSprite() *ebiten.Image {
+	if player.IsPrimary {
+		return player.Sprites[0]
+	}
+
+	return player.Sprites[1]
+}

go.mod

@@ -3,16 +3,18 @@ module openquell
 go 1.21
 
 require (
-	github.com/hajimehoshi/ebiten/v2 v2.6.5
+	github.com/hajimehoshi/ebiten/v2 v2.6.6
 	github.com/mlange-42/arche v0.10.0
 )
 
 require (
 	github.com/alecthomas/repr v0.3.0 // indirect
-	github.com/ebitengine/purego v0.5.0 // indirect
+	github.com/ebitengine/purego v0.6.0 // indirect
 	github.com/ebitenui/ebitenui v0.5.5 // indirect
 	github.com/fatih/color v1.16.0 // indirect
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20221017161538-93cebf72946b // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/hajimehoshi/ebiten v1.12.12 // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect

go.sum

@@ -1,17 +1,38 @@
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/alecthomas/repr v0.3.0 h1:NeYzUPfjjlqHY4KtzgKJiWd6sVq2eNUPTi34PiFGjY8=
 github.com/alecthomas/repr v0.3.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/ebitengine/purego v0.5.0 h1:JrMGKfRIAM4/QVKaesIIT7m/UVjTj5GYhRSQYwfVdpo=
 github.com/ebitengine/purego v0.5.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
+github.com/ebitengine/purego v0.6.0 h1:Yo9uBc1x+ETQbfEaf6wcBsjrQfCEnh/gaGUg7lguEJY=
+github.com/ebitengine/purego v0.6.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
 github.com/ebitenui/ebitenui v0.5.5 h1:L9UCWmiMlo4sG5TavQKmjfsnwMmYqkld2tXWZMmKkSA=
 github.com/ebitenui/ebitenui v0.5.5/go.mod h1:CkzAwu9Ks32P+NC/7+iypdLA85Wqnn93UztPFE+kAH4=
 github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
 github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
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 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/bitmapfont v1.3.0/go.mod h1:/Qb7yVjHYNUV4JdqNkPs6BSZwLjKqkZOMIp6jZD0KgE=
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 github.com/jezek/xgb v1.1.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+github.com/jfreymuth/oggvorbis v1.0.1/go.mod h1:NqS+K+UXKje0FUYUPosyQ+XTVvjmVjps1aEZH1sumIk=
+github.com/jfreymuth/vorbis v1.0.0/go.mod h1:8zy3lUAm9K/rJJk223RKy6vjCZTWC61NA2QD06bfOE0=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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@@ -19,35 +40,63 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
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+github.com/pkg/browser v0.0.0-20180916011732-0a3d74bf9ce4/go.mod h1:4OwLy04Bl9Ef3GJJCoec+30X3LQs/0/m4HFRt/2LUSA=
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@@ -69,10 +118,16 @@ golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/tools v0.0.0-20200918232735-d647fc253266/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

grid/grid.go

@@ -65,6 +65,7 @@ func NewGrid(world *ecs.World,
 	var render *components.Renderable
 	var speed *components.Speed
 	var transient *components.Transient
+	var player *components.Player
 
 	playerobserver := observers.GetPlayerObserver(world)
 	obstacleobserver := observers.GetObstacleObserver(world)
@@ -78,9 +79,11 @@ func NewGrid(world *ecs.World,
 				pos, render, _, _ = solidmapper.Get(entity)
 			case tile.Player:
 				entity := playermapper.New()
-				pos, _, render, speed, _ = playermapper.Get(entity)
+				pos, _, render, speed, player = playermapper.Get(entity)
 				playerobserver.AddEntity(entity)
 				speed.Value = config.PLAYERSPEED
+				player.IsPrimary = tile.IsPrimary
+				player.Sprites = tile.Tiles
 			case tile.Collectible:
 				entity := colmapper.New()
 				pos, render, _ = colmapper.Get(entity)

level-mode.el

@@ -0,0 +1,18 @@
+(define-derived-mode level-mode text-mode "level mode"
+  "game levels"
+  (setq buffer-face-mode-face '(:family "Monaco-10:spacing=110" :height 100 ))
+  )
+
+(defun level-delete-char()
+  (interactive)
+  (when (< 2 (line-number-at-pos))
+    (delete-char 1)))
+
+(add-hook 'level-mode-hook 'whitespace-mode)
+(add-hook 'level-mode-hook (lambda() (hungry-delete-mode 0)))
+
+(add-hook 'level-mode-hook
+          (lambda ()
+            (add-hook 'post-self-insert-hook 'level-delete-char nil 'make-it-local)))
+
+(provide 'level-mode)

systems/player_system.go

@@ -1,10 +1,12 @@
 package systems
 
 import (
+	"log/slog"
 	. "openquell/components"
 	. "openquell/config"
 
 	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/mlange-42/arche/ecs"
 	"github.com/mlange-42/arche/generic"
 )
@@ -34,10 +36,41 @@ func NewPlayerSystem(world *ecs.World, grid *GridSystem) *PlayerSystem {
 }
 
 func (system PlayerSystem) Update() error {
+	// first check if we need to switch player
+	switchable := false
 	query := system.Selector.Query(system.World)
-
 	for query.Next() {
-		playerposition, velocity, _, _, _ := query.Get()
+		_, _, player, _, _ := query.Get()
+		if !player.IsPrimary {
+			switchable = true
+		}
+	}
+
+	if switchable {
+		query := system.Selector.Query(system.World)
+		for query.Next() {
+			_, _, player, render, _ := query.Get()
+			if inpututil.IsKeyJustPressed(ebiten.KeyTab) {
+				slog.Debug("switch players")
+				if player.IsPrimary {
+					player.IsPrimary = false
+					render.Image = player.SwitchSprite()
+				} else {
+					player.IsPrimary = true
+					render.Image = player.SwitchSprite()
+				}
+			}
+		}
+	}
+
+	// check player movements etc
+	query = system.Selector.Query(system.World)
+	for query.Next() {
+		playerposition, velocity, player, _, _ := query.Get()
+
+		if !player.IsPrimary {
+			continue
+		}
 
 		if !velocity.Moving() {
 			switch {