P2: Add multiplayer session

public/src/css/main.css

@@ -214,6 +214,7 @@ kbd{
 	margin-bottom: 1em;
 	background: #fff;
 	border: 1px solid #a9a9a9;
+	user-select: all;
 }
 .text-warn{
 	color: #d00;
@@ -226,6 +227,21 @@ kbd{
 .nowrap{
 	white-space: nowrap;
 }
+#session-invite{
+	width: 100%;
+	height: 1.9em;
+	font-family: sans-serif;
+	font-size: 2em;
+	background: #fff;
+	border: 1px solid #a9a9a9;
+	padding: 0.3em;
+	margin: 0.3em 0;
+	box-sizing: border-box;
+	text-align: center;
+	user-select: all;
+	cursor: text;
+	overflow: hidden;
+}
 @keyframes bgscroll{
 	from{
 		background-position: 0 top;

public/src/js/assets.js

@@ -117,7 +117,8 @@ var assets = {
 		"titlescreen.html",
 		"tutorial.html",
 		"about.html",
-		"debug.html"
+		"debug.html",
+		"session.html"
 	],
 	
 	"songs": [],

public/src/js/game.js

@@ -294,7 +294,9 @@ class Game{
 				this.musicFadeOut++
 			}else if(this.musicFadeOut === 1 && ms >= started + 1600){
 				this.controller.gameEnded()
-				p2.send("gameend")
+				if(!p2.session){
+					p2.send("gameend")
+				}
 				this.musicFadeOut++
 			}else if(this.musicFadeOut === 2 && (ms >= started + 8600 && ms >= musicDuration + 250)){
 				this.controller.displayResults()

public/src/js/loader.js

@@ -4,7 +4,6 @@ class Loader{
 		this.loadedAssets = 0
 		this.assetsDiv = document.getElementById("assets")
 		this.canvasTest = new CanvasTest()
-		p2 = new P2Connection()
 		this.startTime = +new Date
 		
 		this.ajax("src/views/loader.html").then(this.run.bind(this))
@@ -97,6 +96,24 @@ class Loader{
 					}
 				}))
 				
+				if(location.hash.length === 6){
+					this.promises.push(new Promise(resolve => {
+						p2.open()
+						pageEvents.add(p2, "message", response => {
+							if(response.type === "session"){
+								resolve()
+							}else if(response.type === "gameend"){
+								p2.hash("")
+								p2.hashLock = false
+								resolve()
+							}
+						})
+						p2.send("invite", location.hash.slice(1).toLowerCase())
+					}).then(() => {
+						pageEvents.remove(p2, "message")
+					}))
+				}
+				
 				this.promises.forEach(promise => {
 					promise.then(this.assetLoaded.bind(this))
 				})

public/src/js/loadsong.js

@@ -92,6 +92,8 @@ class loadSong{
 					}
 				}else if(event.type === "gamestart"){
 					this.clean()
+					p2.clearMessage("scorenext")
+					p2.clearMessage("songsel")
 					loader.changePage("game")
 					var taikoGame1 = new Controller(this.selectedSong, this.songData, false, 1, this.touchEnabled)
 					var taikoGame2 = new Controller(this.selectedSong2, this.song2Data, true, 2, this.touchEnabled)

public/src/js/main.js

@@ -58,7 +58,7 @@ var fullScreenSupported = "requestFullscreen" in root || "webkitRequestFullscree
 
 var pageEvents = new PageEvents()
 var snd = {}
-var p2
+var p2 = new P2Connection()
 var disableBlur = false
 var cancelTouch = true
 var lastHeight
@@ -98,6 +98,11 @@ pageEvents.keyAdd(debugObj, "all", "down", event => {
 		debugObj.controller.restartSong()
 	}
 })
+if(location.hash.length === 6){
+	p2.hashLock = true
+}else{
+	p2.hash("")
+}
 
 var loader = new Loader(() => {
 	new Titlescreen()

public/src/js/p2.js

@@ -5,6 +5,8 @@ class P2Connection{
 		this.otherConnected = false
 		this.allEvents = new Map()
 		this.addEventListener("message", this.message.bind(this))
+		this.currentHash = ""
+		pageEvents.add(window, "hashchange", this.onhashchange.bind(this))
 	}
 	addEventListener(type, callback){
 		var addedType = this.allEvents.get(type)
@@ -24,8 +26,8 @@ class P2Connection{
 		this.closed = false
 		var wsProtocol = location.protocol == "https:" ? "wss:" : "ws:"
 		this.socket = new WebSocket(wsProtocol + "//" + location.host + "/p2")
-		pageEvents.race(this.socket, "open", "close", listener =>{
-			if(listener === "open"){
+		pageEvents.race(this.socket, "open", "close").then(response => {
+			if(response.type === "open"){
 				return this.openEvent()
 			}
 			return this.closeEvent()
@@ -76,17 +78,22 @@ class P2Connection{
 		}catch(e){
 			var response = {}
 		}
-		this.lastMessages[response.type] = response.value
+		this.lastMessages[response.type] = response
 		var addedType = this.allEvents.get("message")
 		if(addedType){
 			addedType.forEach(callback => callback(response))
 		}
 	}
-	getMessage(type, callback){
+	getMessage(type){
 		if(type in this.lastMessages){
 			return this.lastMessages[type]
 		}
 	}
+	clearMessage(type){
+		if(type in this.lastMessages){
+			this.lastMessages[type] = null
+		}
+	}
 	message(response){
 		switch(response.type){
 			case "gamestart":
@@ -98,6 +105,11 @@ class P2Connection{
 				break
 			case "gameend":
 				this.otherConnected = false
+				this.session = false
+				if(this.hashLock){
+					this.hash("")
+					this.hashLock = false
+				}
 				break
 			case "gameresults":
 				this.results = {}
@@ -114,8 +126,24 @@ class P2Connection{
 			case "drumroll":
 				this.drumrollPace = response.value.pace
 				break
+			case "session":
+				this.clearMessage("users")
+				this.otherConnected = true
+				this.session = true
+				break
 		}
 	}
+	onhashchange(){
+		if(this.hashLock){
+			this.hash(this.currentHash)
+		}else{
+			location.reload()
+		}
+	}
+	hash(string){
+		this.currentHash = string
+		history.replaceState("", "", location.pathname + (string ? "#" + string : ""))
+	}
 	play(circle, mekadon){
 		if(this.otherConnected || this.notes.length > 0){
 			var type = circle.getType()

public/src/js/scoresheet.js

@@ -33,6 +33,23 @@ class Scoresheet{
 		
 		assets.sounds["results"].play()
 		assets.sounds["bgm_result"].playLoop(3, false, 0, 0.847, 17.689)
+		
+		if(p2.session){
+			if(p2.getMessage("scorenext")){
+				this.toScorenext(true)
+			}
+			if(p2.getMessage("songsel")){
+				this.toSongsel(true)
+			}
+			pageEvents.add(p2, "message", response => {
+				if(response.type === "scorenext"){
+					this.toScorenext(true)
+				}else if(response.type === "songsel"){
+					this.state.pointerLocked = true
+					this.toSongsel(true)
+				}
+			})
+		}
 	}
 	keyDown(event, code){
 		if(!code){
@@ -68,16 +85,29 @@ class Scoresheet{
 		this.toNext()
 	}
 	toNext(){
-		var ms = this.getMS()
-		var elapsed = ms - this.state.screenMS
+		var elapsed = this.getMS() - this.state.screenMS
 		if(this.state.screen === "fadeIn" && elapsed >= this.state.startDelay){
-			this.state.screen = "scoresShown"
-			this.state.screenMS = ms
-			assets.sounds["note_don"].play()
+			this.toScorenext()
 		}else if(this.state.screen === "scoresShown" && elapsed >= 1000){
+			this.toSongsel()
+		}
+	}
+	toScorenext(fromP2){
+		if(p2.session && !fromP2){
+			p2.send("scorenext")
+		}
+		this.state.screen = "scoresShown"
+		this.state.screenMS = this.getMS()
+		assets.sounds["note_don"].play()
+	}
+	toSongsel(fromP2){
+		if(p2.session && !fromP2){
+			this.state.pointerLocked = true
+			p2.send("songsel")
+		}else{
 			snd.musicGain.fadeOut(0.5)
 			this.state.screen = "fadeOut"
-			this.state.screenMS = ms
+			this.state.screenMS = this.getMS()
 			assets.sounds["note_don"].play()
 		}
 	}

public/src/js/session.js

@@ -0,0 +1,65 @@
+class Session{
+	constructor(touchEnabled){
+		this.touchEnabled = touchEnabled
+		loader.changePage("session")
+		this.endButton = document.getElementById("tutorial-end-button")
+		if(touchEnabled){
+			document.getElementById("tutorial-outer").classList.add("touch-enabled")
+		}
+		this.sessionInvite = document.getElementById("session-invite")
+		
+		pageEvents.add(window, ["mousedown", "touchstart"], this.mouseDown.bind(this))
+		pageEvents.keyOnce(this, 27, "down").then(this.onEnd.bind(this))
+		
+		this.gamepad = new Gamepad({
+			"confirm": ["start", "b", "ls", "rs"]
+		}, this.onEnd.bind(this))
+		
+		p2.hashLock = true
+		pageEvents.add(p2, "message", response => {
+			if(response.type === "invite"){
+				this.sessionInvite.innerText = location.origin + location.pathname + "#" + response.value
+				p2.hash(response.value)
+			}else if(response.type === "songsel"){
+				p2.clearMessage("users")
+				this.onEnd(false, true)
+			}
+		})
+		p2.send("invite")
+	}
+	mouseDown(event){
+		if(event.target === this.sessionInvite){
+			this.sessionInvite.focus()
+		}else{
+			getSelection().removeAllRanges()
+			this.sessionInvite.blur()
+		}
+		if(event.target === this.endButton){
+			this.onEnd()
+		}
+	}
+	onEnd(event, fromP2){
+		if(!p2.session){
+			p2.send("leave")
+			p2.hash("")
+			p2.hashLock = false
+		}else if(!fromP2){
+			return p2.send("songsel")
+		}
+		if(event && event.type === "keydown"){
+			event.preventDefault()
+		}
+		this.clean()
+		assets.sounds["don"].play()
+		setTimeout(() => {
+			new SongSelect(false, false, this.touchEnabled)
+		}, 500)
+	}
+	clean(){
+		this.gamepad.clean()
+		pageEvents.remove(window, ["mousedown", "touchstart"])
+		pageEvents.keyRemove(this, 27)
+		delete this.endButton
+		delete this.sessionInvite
+	}
+}

public/src/js/songselect.js

@@ -176,10 +176,16 @@ class SongSelect{
 		this.selectTextCache = new CanvasCache()
 		this.categoryCache = new CanvasCache()
 		this.difficultyCache = new CanvasCache()
+		this.sessionCache = new CanvasCache()
 		
 		this.difficulty = ["かんたん", "ふつう", "むずかしい", "おに"]
 		this.difficultyId = ["easy", "normal", "hard", "oni", "ura"]
 		
+		this.sessionText = {
+			"sessionstart": "2人プレイのネットプレイセッションを開始する！",
+			"sessionend": "ネットプレイを終了する"
+		}
+		
 		this.selectedSong = 0
 		this.selectedDiff = 0
 		assets.sounds["bgm_songsel"].playLoop(0.1, false, 0, 1.442, 3.506)
@@ -187,12 +193,15 @@ class SongSelect{
 		if(!fromTutorial && !("selectedSong" in localStorage)){
 			fromTutorial = touchEnabled ? "about" : "tutorial"
 		}
+		if(p2.session){
+			fromTutorial = false
+		}
 		
 		if(fromTutorial){
 			this.selectedSong = this.songs.findIndex(song => song.action === fromTutorial)
 			this.playBgm(true)
 		}else{
-			if("selectedSong" in localStorage){
+			if(!p2.session && "selectedSong" in localStorage){
 				this.selectedSong = Math.min(Math.max(0, localStorage["selectedSong"] |0), this.songs.length)
 			}
 			assets.sounds["song-select"].play()
@@ -209,8 +218,9 @@ class SongSelect{
 		this.songSelect.style.backgroundImage = "url('" + assets.image["bg_genre_" + sort].src + "')"
 		
 		this.previewId = 0
+		var skipStart = fromTutorial || p2.session
 		this.state = {
-			screen: fromTutorial ? "song" : (fadeIn ? "titleFadeIn" : "title"),
+			screen: skipStart ? "song" : (fadeIn ? "titleFadeIn" : "title"),
 			screenMS: this.getMS(),
 			move: 0,
 			moveMS: 0,
@@ -218,7 +228,8 @@ class SongSelect{
 			moveHover: null,
 			locked: true,
 			hasPointer: false,
-			options: 0
+			options: 0,
+			selLock: false
 		}
 		this.songSelecting = {
 			speed: 800,
@@ -244,6 +255,9 @@ class SongSelect{
 		
 		pageEvents.keyAdd(this, "all", "down", this.keyDown.bind(this))
 		pageEvents.add(loader.screen, "mousemove", this.mouseMove.bind(this))
+		pageEvents.add(loader.screen, "mouseleave", () => {
+			this.state.moveHover = null
+		})
 		pageEvents.add(loader.screen, ["mousedown", "touchstart"], this.mouseDown.bind(this))
 		if(touchEnabled && fullScreenSupported){
 			this.touchFullBtn = document.getElementById("touch-full-btn")
@@ -350,11 +364,15 @@ class SongSelect{
 			var touch = true
 		}
 		if(this.state.screen === "song"){
-			var moveBy = this.songSelMouse(mouse.x, mouse.y)
-			if(moveBy === 0){
-				this.toSelectDifficulty()
-			}else if(moveBy !== null){
-				this.moveToSong(moveBy)
+			if(mouse.x > 513 && mouse.y > 603){
+				this.toSession()
+			}else{
+				var moveBy = this.songSelMouse(mouse.x, mouse.y)
+				if(moveBy === 0){
+					this.toSelectDifficulty()
+				}else if(moveBy !== null){
+					this.moveToSong(moveBy)
+				}
 			}
 		}else if(this.state.screen === "difficulty"){
 			var moveBy = this.diffSelMouse(mouse.x, mouse.y)
@@ -380,9 +398,13 @@ class SongSelect{
 		var mouse = this.mouseOffset(event.offsetX, event.offsetY)
 		var moveTo = null
 		if(this.state.screen === "song"){
-			var moveTo = this.songSelMouse(mouse.x, mouse.y)
-			if(moveTo === null && this.state.moveHover === 0 && !this.songs[this.selectedSong].stars){
-				this.state.moveMS = this.getMS() - this.songSelecting.speed
+			if(mouse.x > 513 && mouse.y > 603){
+				moveTo = "session"
+			}else{
+				var moveTo = this.songSelMouse(mouse.x, mouse.y)
+				if(moveTo === null && this.state.moveHover === 0 && !this.songs[this.selectedSong].stars){
+					this.state.moveMS = this.getMS() - this.songSelecting.speed
+				}
 			}
 			this.state.moveHover = moveTo
 		}else if(this.state.screen === "difficulty"){
@@ -446,10 +468,17 @@ class SongSelect{
 		return null
 	}
 	
-	moveToSong(moveBy){
-		if(this.state.locked !== 1){
-			var ms = this.getMS()
-			if(this.songs[this.selectedSong].stars && this.state.locked === 0){
+	moveToSong(moveBy, fromP2){
+		var ms = this.getMS()
+		if(p2.session && !fromP2){
+			if(!this.state.selLock && ms > this.state.moveMS + 800){
+				this.state.selLock = true
+				p2.send("songsel", {
+					song: this.mod(this.songs.length, this.selectedSong + moveBy)
+				})
+			}
+		}else if(this.state.locked !== 1 || fromP2){
+			if(this.songs[this.selectedSong].stars && (this.state.locked === 0 || fromP2)){
 				this.state.moveMS = ms
 			}else{
 				this.state.moveMS = ms - this.songSelecting.speed * this.songSelecting.resize
@@ -482,9 +511,19 @@ class SongSelect{
 			assets.sounds["ka"].play()
 		}
 	}
-	toSelectDifficulty(){
-		if(this.state.locked === 0){
-			var currentSong = this.songs[this.selectedSong]
+	toSelectDifficulty(fromP2){
+		var currentSong = this.songs[this.selectedSong]
+		if(p2.session && !fromP2 && currentSong.action !== "random"){
+			if(this.songs[this.selectedSong].stars){
+				if(!this.state.selLock){
+					this.state.selLock = true
+					p2.send("songsel", {
+						song: this.selectedSong,
+						selected: true
+					})
+				}
+			}
+		}else if(this.state.locked === 0 || fromP2){
 			if(currentSong.stars){
 				this.state.screen = "difficulty"
 				this.state.screenMS = this.getMS()
@@ -516,11 +555,18 @@ class SongSelect{
 			}else if(currentSong.action === "about"){
 				this.toAbout()
 			}
-			this.pointer(false)
 		}
+		this.pointer(false)
 	}
-	toSongSelect(){
-		if(this.state.locked !== 1){
+	toSongSelect(fromP2){
+		if(p2.session && !fromP2){
+			if(!this.state.selLock){
+				this.state.selLock = true
+				p2.send("songsel", {
+					song: this.selectedSong
+				})
+			}
+		}else if(fromP2 || this.state.locked !== 1){
 			this.state.screen = "song"
 			this.state.screenMS = this.getMS()
 			this.state.locked = true
@@ -544,10 +590,10 @@ class SongSelect{
 		}
 		var autoplay = false
 		var multiplayer = false
-		if(this.state.options === 1){
-			autoplay = true
-		}else if(this.state.options === 2){
+		if(p2.session || this.state.options === 2){
 			multiplayer = true
+		}else if(this.state.options === 1){
+			autoplay = true
 		}else if(shift){
 			autoplay = shift
 		}else{
@@ -564,16 +610,20 @@ class SongSelect{
 		}, autoplay, multiplayer, touch)
 	}
 	toOptions(moveBy){
-		assets.sounds["ka"].play()
-		this.selectedDiff = 1
-		this.state.options = this.mod(this.optionsList.length, this.state.options + moveBy)
+		if(!p2.session){
+			assets.sounds["ka"].play()
+			this.selectedDiff = 1
+			this.state.options = this.mod(this.optionsList.length, this.state.options + moveBy)
+		}
 	}
 	toTitleScreen(){
-		assets.sounds["cancel"].play()
-		this.clean()
-		setTimeout(() => {
-			new Titlescreen()
-		}, 500)
+		if(!p2.session){
+			assets.sounds["cancel"].play()
+			this.clean()
+			setTimeout(() => {
+				new Titlescreen()
+			}, 500)
+		}
 	}
 	toTutorial(){
 		assets.sounds["don"].play()
@@ -589,6 +639,17 @@ class SongSelect{
 			new About(this.touchEnabled)
 		}, 500)
 	}
+	toSession(){
+		if(p2.session){
+			p2.send("gameend")
+		}else{
+			assets.sounds["don"].play()
+			this.clean()
+			setTimeout(() => {
+				new Session(this.touchEnabled)
+			}, 500)
+		}
+	}
 	
 	redraw(){
 		if(!this.redrawRunning){
@@ -657,6 +718,28 @@ class SongSelect{
 			
 			this.difficultyCache.resize((44 + 56 + 2) * 5, 135 + 10, ratio + 0.5)
 			
+			var w = winW / ratio / 2
+			this.sessionCache.resize(w, 39 * 2, ratio + 0.5)
+			for(var id in this.sessionText){
+				this.sessionCache.set({
+					w: w,
+					h: 38,
+					id: id
+				}, ctx => {
+					var text = this.sessionText[id]
+					ctx.font = "28px " + this.font
+					ctx.textAlign = "center"
+					ctx.textBaseline = "middle"
+					ctx.strokeStyle = "#000"
+					ctx.lineWidth = 8
+					ctx.lineJoin = "round"
+					ctx.miterLimit = 1
+					ctx.strokeText(text, w / 2, 38 / 2)
+					ctx.fillStyle = "#fff"
+					ctx.fillText(text, w / 2, 38 / 2)
+				})
+			}
+			
 			this.selectableText = ""
 		}else if(!document.hasFocus()){
 			this.pointer(false)
@@ -1273,6 +1356,98 @@ class SongSelect{
 			})
 		}
 		
+		ctx.fillStyle = "#000"
+		ctx.fillRect(0, frameTop + 595, 1280 + frameLeft * 2, 125 + frameTop)
+		var x = 0
+		var y = frameTop + 603
+		var w = frameLeft + 638
+		var h = 117 + frameTop
+		this.draw.pattern({
+			ctx: ctx,
+			img: assets.image["bg_score_p1"],
+			x: x,
+			y: y,
+			w: w,
+			h: h,
+			dx: frameLeft + 10,
+			dy: frameTop + 15,
+			scale: 1.55
+		})
+		ctx.fillStyle = "rgba(249, 163, 149, 0.5)"
+		ctx.beginPath()
+		ctx.moveTo(x, y)
+		ctx.lineTo(x + w, y)
+		ctx.lineTo(x + w - 4, y + 4)
+		ctx.lineTo(x, y + 4)
+		ctx.fill()
+		ctx.fillStyle = "rgba(0, 0, 0, 0.25)"
+		ctx.beginPath()
+		ctx.moveTo(x + w, y)
+		ctx.lineTo(x + w, y + h)
+		ctx.lineTo(x + w - 4, y + h)
+		ctx.lineTo(x + w - 4, y + 4)
+		ctx.fill()
+		x = frameLeft + 642
+		this.draw.pattern({
+			ctx: ctx,
+			img: assets.image["bg_score_p2"],
+			x: x,
+			y: y,
+			w: w,
+			h: h,
+			dx: frameLeft + 15,
+			dy: frameTop - 20,
+			scale: 1.55
+		})
+		ctx.fillStyle = "rgba(138, 245, 247, 0.5)"
+		ctx.beginPath()
+		ctx.moveTo(x, y + h)
+		ctx.lineTo(x, y)
+		ctx.lineTo(x + w, y)
+		ctx.lineTo(x + w, y + 4)
+		ctx.lineTo(x + 4, y + 4)
+		ctx.lineTo(x + 4, y + h)
+		ctx.fill()
+		if(screen !== "difficulty"){
+			var elapsed = (ms - this.state.screenMS) % 3100
+			var fade = 1
+			if(!p2.session && screen === "song"){
+				if(elapsed > 2800){
+					fade = (elapsed - 2800) / 300
+				}else if(2000 < elapsed){
+					if(elapsed < 2300){
+						fade = 1 - (elapsed - 2000) / 300
+					}else{
+						fade = 0
+					}
+				}
+			}
+			if(fade > 0){
+				if(fade < 1){
+					ctx.globalAlpha = this.draw.easeIn(fade)
+				}
+				this.sessionCache.get({
+					ctx: ctx,
+					x: winW / 2,
+					y: y + (h - 32) / 2,
+					w: winW / 2,
+					h: 38,
+					id: p2.session ? "sessionend" : "sessionstart"
+				})
+				ctx.globalAlpha = 1
+			}
+			if(this.state.moveHover === "session"){
+				this.draw.highlight({
+					ctx: ctx,
+					x: x,
+					y: y,
+					w: w,
+					h: h,
+					opacity: 0.8
+				})
+			}
+		}
+		
 		if(screen === "titleFadeIn"){
 			ctx.save()
 			
@@ -1408,8 +1583,8 @@ class SongSelect{
 		this.songs.forEach(song => {
 			song.p2Cursor = null
 		})
-		if(response){
-			response.forEach(idDiff => {
+		if(response && response.value){
+			response.value.forEach(idDiff => {
 				var id = idDiff.id |0
 				var diff = idDiff.diff
 				var diffId = this.difficultyId.indexOf(diff)
@@ -1417,17 +1592,72 @@ class SongSelect{
 					diffId = 3
 				}
 				if(diffId >= 0){
-					var currentSong = this.songs.find(song => song.id === id)
+					var index = 0
+					var currentSong = this.songs.find((song, i) => {
+						index = i
+						return song.id === id
+					})
 					currentSong.p2Cursor = diffId
+					if(currentSong.stars){
+						this.selectedSong = index
+						this.state.move = 0
+						if(this.state.screen !== "difficulty"){
+							this.toSelectDifficulty(true)
+						}
+					}
 				}
 			})
 		}
 	}
+	onsongsel(response){
+		if(response && response.value){
+			var selected = false
+			if("selected" in response.value){
+				selected = response.value.selected
+			}
+			if("song" in response.value){
+				var song = +response.value.song
+				if(song >= 0 && song < this.songs.length){
+					if(!selected){
+						this.state.locked = true
+						if(this.state.screen === "difficulty"){
+							this.toSongSelect(true)
+						}
+						var moveBy = song - this.selectedSong
+						if(moveBy){
+							if(this.selectedSong < song){
+								var altMoveBy = -this.mod(this.songs.length, this.selectedSong - song)
+							}else{
+								var altMoveBy = this.mod(this.songs.length, moveBy)
+							}
+							if(Math.abs(altMoveBy) < Math.abs(moveBy)){
+								moveBy = altMoveBy
+							}
+							this.moveToSong(moveBy, true)
+						}
+					}else if(this.songs[song].stars){
+						this.selectedSong = song
+						this.state.move = 0
+						if(this.state.screen !== "difficulty"){
+							this.toSelectDifficulty(true)
+						}
+					}
+				}
+			}
+		}
+	}
 	startP2(){
 		this.onusers(p2.getMessage("users"))
+		if(p2.session){
+			this.onsongsel(p2.getMessage("songsel"))
+		}
 		pageEvents.add(p2, "message", response => {
 			if(response.type == "users"){
-				this.onusers(response.value)
+				this.onusers(response)
+			}
+			if(p2.session && response.type == "songsel"){
+				this.onsongsel(response)
+				this.state.selLock = false
 			}
 		})
 		if(p2.closed){
@@ -1449,6 +1679,7 @@ class SongSelect{
 		this.selectTextCache.clean()
 		this.categoryCache.clean()
 		this.difficultyCache.clean()
+		this.sessionCache.clean()
 		assets.sounds["bgm_songsel"].stop()
 		if(!this.bgmEnabled){
 			snd.musicGain.fadeIn()
@@ -1459,7 +1690,8 @@ class SongSelect{
 		this.redrawRunning = false
 		this.endPreview()
 		pageEvents.keyRemove(this, "all")
-		pageEvents.remove(loader.screen, ["mousemove", "mousedown", "touchstart"])
+		pageEvents.remove(loader.screen, ["mousemove", "mouseleave", "mousedown", "touchstart"])
+		pageEvents.remove(p2, "message")
 		if(this.touchEnabled && fullScreenSupported){
 			pageEvents.remove(this.touchFullBtn, "click")
 			delete this.touchFullBtn

public/src/js/titlescreen.js

@@ -12,6 +12,13 @@ class Titlescreen{
 				this.onPressed()
 			}
 		})
+		if(p2.session){
+			pageEvents.add(p2, "message", response => {
+				if(response.type === "songsel"){
+					this.goNext(true)
+				}
+			})
+		}
 	}
 	keyDown(event, code){
 		if(!code){
@@ -34,13 +41,20 @@ class Titlescreen{
 		this.titleScreen.style.cursor = "auto"
 		this.clean()
 		assets.sounds["don"].play()
-		setTimeout(this.goNext.bind(this), 500)
+		this.goNext()
 	}
-	goNext(){
-		if(this.touched || localStorage.getItem("tutorial") === "true"){
-			new SongSelect(false, false, this.touched)
+	goNext(fromP2){
+		if(p2.session && !fromP2){
+			p2.send("songsel")
+		}else if(fromP2 || this.touched || localStorage.getItem("tutorial") === "true"){
+			pageEvents.remove(p2, "message")
+			setTimeout(() => {
+				new SongSelect(false, false, this.touched)
+			}, 500)
 		}else{
-			new Tutorial()
+			setTimeout(() => {
+				new Tutorial()
+			}, 500)
 		}
 	}
 	clean(){

public/src/views/session.html

@@ -0,0 +1,11 @@
+<div id="tutorial-outer">
+	<div id="tutorial">
+		<div id="tutorial-title" class="stroke-sub" alt="Multiplayer Session">Multiplayer Session</div>
+		<div id="tutorial-content">
+			Share this link with your friend to start playing together! Do not leave this screen while they join.
+			<div id="session-invite"></div>
+		</div>
+
+		<div id="tutorial-end-button" class="taibtn stroke-sub" alt="Cancel">Cancel</div>
+	</div>
+</div>

server.py

@@ -3,11 +3,14 @@
 import asyncio
 import websockets
 import json
+import random
 
 server_status = {
 	"waiting": {},
-	"users": []
+	"users": [],
+	"invites": {}
 }
+consonants = "bcdfghjklmnpqrstvwxyz"
 
 def msgobj(type, value=None):
 	if value == None:
@@ -24,6 +27,9 @@ def status_event():
 		})
 	return msgobj("users", value)
 
+def get_invite():
+	return "".join([random.choice(consonants) for x in range(5)])
+
 async def notify_status():
 	ready_users = [user for user in server_status["users"] if "ws" in user and user["action"] == "ready"]
 	if ready_users:
@@ -34,7 +40,8 @@ async def connection(ws, path):
 	# User connected
 	user = {
 		"ws": ws,
-		"action": "ready"
+		"action": "ready",
+		"session": False
 	}
 	server_status["users"].append(user)
 	try:
@@ -66,6 +73,8 @@ async def connection(ws, path):
 				if action == "ready":
 					# Not playing or waiting
 					if type == "join":
+						if value == None:
+							continue
 						waiting = server_status["waiting"]
 						id = value["id"] if "id" in value else None
 						diff = value["diff"] if "diff" in value else None
@@ -95,6 +104,7 @@ async def connection(ws, path):
 								])
 							else:
 								# Wait for another user
+								del user["other_user"]
 								user["action"] = "waiting"
 								user["gameid"] = id
 								waiting[id] = {
@@ -104,9 +114,37 @@ async def connection(ws, path):
 								await ws.send(msgobj("waiting"))
 						# Update others on waiting players
 						await notify_status()
+					elif type == "invite":
+						if value == None:
+							# Session invite link requested
+							invite = get_invite()
+							server_status["invites"][invite] = user
+							user["action"] = "invite"
+							user["session"] = invite
+							await ws.send(msgobj("invite", invite))
+						elif value in server_status["invites"]:
+							# Join a session with the other user
+							user["other_user"] = server_status["invites"][value]
+							del server_status["invites"][value]
+							if "ws" in user["other_user"]:
+								user["other_user"]["other_user"] = user
+								user["action"] = "invite"
+								user["session"] = value
+								sent_msg = msgobj("session")
+								await asyncio.wait([
+									ws.send(sent_msg),
+									user["other_user"]["ws"].send(sent_msg)
+								])
+								await ws.send(msgobj("invite"))
+							else:
+								del user["other_user"]
+								await ws.send(msgobj("gameend"))
+						else:
+							# Session code is invalid
+							await ws.send(msgobj("gameend"))
 				elif action == "waiting" or action == "loading" or action == "loaded":
 					# Waiting for another user
-					if type == "leave":
+					if type == "leave" and not user["session"]:
 						# Stop waiting
 						del server_status["waiting"][user["gameid"]]
 						del user["gameid"]
@@ -129,9 +167,23 @@ async def connection(ws, path):
 				elif action == "playing":
 					# Playing with another user
 					if "other_user" in user and "ws" in user["other_user"]:
-						if type == "note" or type == "drumroll" or type == "gameresults":
+						if type == "note"\
+							or type == "drumroll"\
+							or type == "gameresults"\
+							or type == "scorenext" and user["session"]:
 							await user["other_user"]["ws"].send(msgobj(type, value))
-						if type == "gameend":
+						elif type == "songsel" and user["session"]:
+							user["action"] = "songsel"
+							user["other_user"]["action"] = "songsel"
+							sent_msg1 = msgobj(type)
+							sent_msg2 = msgobj("users", [])
+							await asyncio.wait([
+								ws.send(sent_msg1),
+								ws.send(sent_msg2),
+								user["other_user"]["ws"].send(sent_msg1),
+								user["other_user"]["ws"].send(sent_msg2)
+							])
+						elif type == "gameend":
 							# User wants to disconnect
 							user["action"] = "ready"
 							user["other_user"]["action"] = "ready"
@@ -147,6 +199,101 @@ async def connection(ws, path):
 					else:
 						# Other user disconnected
 						user["action"] = "ready"
+						user["session"] = False
+						await asyncio.wait([
+							ws.send(msgobj("gameend")),
+							ws.send(status_event())
+						])
+				elif action == "invite":
+					if type == "leave":
+						# Cancel session invite
+						if user["session"] in server_status["invites"]:
+							del server_status["invites"][user["session"]]
+						user["action"] = "ready"
+						user["session"] = False
+						if "other_user" in user and "ws" in user["other_user"]:
+							user["other_user"]["action"] = "ready"
+							user["other_user"]["session"] = False
+							sent_msg = status_event()
+							await asyncio.wait([
+								ws.send(msgobj("left")),
+								ws.send(sent_msg),
+								user["other_user"]["ws"].send(msgobj("gameend")),
+								user["other_user"]["ws"].send(sent_msg)
+							])
+						else:
+							await asyncio.wait([
+								ws.send(msgobj("left")),
+								ws.send(status_event())
+							])
+					elif type == "songsel" and "other_user" in user:
+						if "ws" in user["other_user"]:
+							user["action"] = "songsel"
+							user["other_user"]["action"] = "songsel"
+							sent_msg = msgobj(type)
+							await asyncio.wait([
+								ws.send(sent_msg),
+								user["other_user"]["ws"].send(sent_msg)
+							])
+						else:
+							user["action"] = "ready"
+							user["session"] = False
+							await asyncio.wait([
+								ws.send(msgobj("gameend")),
+								ws.send(status_event())
+							])
+				elif action == "songsel":
+					# Session song selection
+					if "other_user" in user and "ws" in user["other_user"]:
+						if type == "songsel":
+							# Change song select position
+							if user["other_user"]["action"] == "songsel":
+								sent_msg = msgobj(type, value)
+								await asyncio.wait([
+									ws.send(sent_msg),
+									user["other_user"]["ws"].send(sent_msg)
+								])
+						elif type == "join":
+							# Start game
+							if value == None:
+								continue
+							id = value["id"] if "id" in value else None
+							diff = value["diff"] if "diff" in value else None
+							if not id or not diff:
+								continue
+							if user["other_user"]["action"] == "waiting":
+								user["action"] = "loading"
+								user["other_user"]["action"] = "loading"
+								await asyncio.wait([
+									ws.send(msgobj("gameload", user["other_user"]["gamediff"])),
+									user["other_user"]["ws"].send(msgobj("gameload", diff))
+								])
+							else:
+								user["action"] = "waiting"
+								user["gamediff"] = diff
+								await user["other_user"]["ws"].send(msgobj("users", [{
+									"id": id,
+									"diff": diff
+								}]))
+						elif type == "gameend":
+							# User wants to disconnect
+							user["action"] = "ready"
+							user["session"] = False
+							user["other_user"]["action"] = "ready"
+							user["other_user"]["session"] = False
+							sent_msg1 = msgobj("gameend")
+							sent_msg2 = status_event()
+							await asyncio.wait([
+								ws.send(sent_msg1),
+								ws.send(sent_msg2),
+								user["other_user"]["ws"].send(sent_msg1),
+								user["other_user"]["ws"].send(sent_msg2)
+							])
+							del user["other_user"]
+					else:
+						# Other user disconnected
+						user["action"] = "ready"
+						user["session"] = False
 						await asyncio.wait([
 							ws.send(msgobj("gameend")),
 							ws.send(status_event())
@@ -157,6 +304,7 @@ async def connection(ws, path):
 		del server_status["users"][server_status["users"].index(user)]
 		if "other_user" in user and "ws" in user["other_user"]:
 			user["other_user"]["action"] = "ready"
+			user["other_user"]["session"] = False
 			await asyncio.wait([
 				user["other_user"]["ws"].send(msgobj("gameend")),
 				user["other_user"]["ws"].send(status_event())
@@ -164,6 +312,8 @@ async def connection(ws, path):
 		if user["action"] == "waiting":
 			del server_status["waiting"][user["gameid"]]
 			await notify_status()
+		elif user["action"] == "invite" and user["session"] in server_status["invites"]:
+			del server_status["invites"][user["session"]]
 
 asyncio.get_event_loop().run_until_complete(
 	websockets.serve(connection, "localhost", 34802)

templates/index.html

@@ -54,6 +54,7 @@
 	<script src="/src/js/parsetja.js?{{version.commit_short}}"></script>
 	<script src="/src/js/about.js?{{version.commit_short}}"></script>
 	<script src="/src/js/debug.js?{{version.commit_short}}"></script>
+	<script src="/src/js/session.js?{{version.commit_short}}"></script>
 	
 </head>
 <body>