Enhanced UDP message callback handling.

Drafted bullet explosion data structure.

.gitignore

@@ -1,3 +1,5 @@
+.vs
+**/.vs
 battle_srv/test_cases/test_cases
 battle_srv/test_cases/tests
 *.pid

ConcerningEdgeCases.md

@@ -47,3 +47,32 @@ renderFrameId             |   toApplyInputFrameId
 ..., ..., ..., 368        |   90
 369, 370, 371, 372        |   91
 373, 374, 375, ...        |   92      
+
+# Would using UDP instead of TCP yield better synchronization performance?
+Yes, but with non-trivial efforts.
+
+## Neat advantage using UDP 
+Let's check an actual use case. As soon as an inputFrame becomes all-confirmed, the server should downsync it to all active players -- and upon reception loss of the packet containing this "all-confirmed downsync inputFrame" to a certain player, the server MUST retransmit another packet containing the same inputFrame to that player. 
+
+To apply UDP on this use case, additional `ack & retransmission mechanism` would be required, which is a moderately difficult task -- don't just pick a 3rd party lib using TCP flow-control alike `sliding window mechanism`, e.g. [RUDP](https://www.geeksforgeeks.org/reliable-user-datagram-protocol-rudp/)! Here's why. 
+
+Assume that the server is downsyncing `sequence of packets[#1, #2, #3, #4, #5, #6, #7, #8, #9, #10]`, when using TCP we get the advantage that each active player is guaranteed to receive that same sequence in the same order -- however in a bad, lossy network when `packet#2` got lost several times for a certain player whose reception window size is just 5, it has to wait for the arrival of `packet#2` at `[_, #3, #4, #5, #6]`, thus unable to process `[#7, #8, #9, #10]` which could contain `unpredictable inputFrame` while `#2` being `correct prediction` for that player.   
+
+That's so neat but still an advantage for using UDP! Yet if the TCP flow-control alike `sliding window mechanism` is employed on UDP, such advantage'd be compromised. 
+
+To summarize, if UDP is used we need 
+- an `ack & retransmission mechanism` built on top of it to guarantee reception of critical packets for active players, and 
+- reception order is not necessary to be reserved (mimic [markConfirmationIfApplicable](https://github.com/genxium/DelayNoMore/blob/v0.9.14/battle_srv/models/room.go#L1085) to maintain `lastAllConfirmedInputFrameId`), but 
+- TCP flow-control alike `sliding window mechanism` should be avoided to gain advantage over TCP. 
+
+## Additional hassles to care about using UDP
+When using UDP, it's also necessary to verify authorization of each incoming packet, e.g. by simple time limited symmetric key, due to being connectionless.
+
+## Why not hybrid?
+Instead of replacing all use of TCP by UDP, it's more reasonable to keep using TCP for login and the "all-confirmed downsync inputFrames" from server to players (and possibly "upsync inputFrames" from player to server, but tradeoff on that remains to be discussed), while using a `UDP secondary session` for broadcasting inputFrames of each individual player asap (either using p2p or not) just for **better prediction performance**!
+
+## How do you actually implement the `UDP secondary session`?
+It's not a global consensus, but in practice many UDP communications are platform specific due to their paired asynchronous I/O choices, e.g. epoll in Linux and kqueue in BSD-ish. Of course there're many 3rd party higher level encapsulated tools for cross-platform use but that introduces extra debugging when things go wrong.
+
+Therefore, the following plan doesn't assume use of any specific 3rd party encapsulation of UDP communication.
+![UDP_secondary_session](./charts/UDPEssentials.jpg)

MULTIHIT_ROADMAP.md

@@ -0,0 +1,7 @@
+Major goals
+- Create several skills that can be chained by pressing "btnA" 3 times, while the 2nd skill cancels the last hit of 1st skill before the latters' FramesToRecover is over, same goes with 2nd->3rd transition. 
+- Note that each skill can contain "multihit".
+
+Minor goals
+- Split jumping anim into "once" part and "keep" part, depending on "character.framesElapsedInChState" we should play the corresponding part
+- Add new "chState = STUNNED", which is applicable to both on ground and in air, while "inAir && STUNNED", "character.FramesToRecover" is regarded as infinite. If implemented, make the last hit of the aforementioned 3rd skill "pushback opponent to air". 

README.md

@@ -1,17 +1,22 @@
 # Preface 
 
-This project is a demo for a websocket-based rollback netcode inspired by [GGPO](https://github.com/pond3r/ggpo/blob/master/doc/README.md).
+This project is a demo for a websocket-based rollback netcode inspired by [GGPO](https://github.com/pond3r/ggpo/blob/master/doc/README.md). 
 
-_(the following gif is sped up to ~1.5x for file size reduction, kindly note that animations are resumed from a partial progress)_
+[Demo recorded over INTERNET (Phone-Wifi v.s. PC-Wifi UDP holepunched) using an input delay of 6 frames](https://pan.baidu.com/s/1UArwqDShLoPjYppjjqsTqQ?pwd=10wc), and it feels SMOOTH when playing!
 
-![gif_demo](./charts/jump_sync_spedup.gif)
+![Merged_cut_annotated_spedup](./charts/Merged_cut_annotated_spedup.gif)
 
-Please also checkout [this demo video](https://pan.baidu.com/s/1Lmot9cb0pYylfUvC8G4fDg?pwd=ia97) to see how this demo carries out a full 60fps synchronization with the help of _batched input upsync/downsync_ for satisfying network I/O performance.
+As lots of feedbacks ask for a discussion on using UDP instead, I tried to summarize my personal opinion about it in [ConcerningEdgeCases](./ConcerningEdgeCases.md) -- **since v0.9.25, the project is actually equipped with UDP capabilities as follows**.
+- When using the so called `native apps` on `Android` and `Windows` (I'm working casually hard to support `iOS` next), the frontends will try to use UDP hole-punching w/ the help of backend as a registry. If UDP hole-punching is working, the rollback is often less than `turn-around frames to recover` and thus not noticeable, being much better than using websocket alone. This video shows how the UDP holepunched p2p performs for [Phone-Wifi v.s. PC-Wifi (viewed by PC side)](https://pan.baidu.com/s/1K6704bJKlrSBTVqGcXhajA?pwd=l7ok).
+- If UDP hole-punching is not working, e.g. for Symmetric NAT like in 4G/5G cellular network, the frontends will use backend as a UDP tunnel (or relay, whatever you like to call it). This video shows how the UDP tunnel performs for [Phone-4G v.s. PC-Wifi (viewed by PC side)](https://pan.baidu.com/s/1IZVa5wVgAdeH6D-xsZYFUw?pwd=dgkj). 
+- Browser vs `native app` is possible but in that case only websocket is used.
 
-The video mainly shows the following features.
-- The backend receives inputs from frontend peers and broadcasts back for synchronization.
-- The game is recovered for a player upon reconnection.
-- Both backend(Golang) and frontend(JavaScript) execute collision detection and handle collision contacts by the same algorithm. The backend dynamics is togglable by [Room.BackendDynamicsEnabled](https://github.com/genxium/DelayNoMore/blob/v0.5.2/battle_srv/models/room.go#L813), but **when turned off the game couldn't support recovery upon reconnection**.
+
+# Notable Features
+- Backend dynamics toggle via [Room.BackendDynamicsEnabled](https://github.com/genxium/DelayNoMore/blob/v0.9.14/battle_srv/models/room.go#L786)
+- Recovery upon reconnection (only if backend dynamics is ON)
+- Automatically correction for "slow ticker", especially "active slow ticker" which is well-known to be a headache for input synchronization
+- Frame data logging toggle for both frontend & backend, useful for debugging out of sync entities when developing new features
 
 _(how input delay roughly works)_
 
@@ -19,7 +24,10 @@ _(how input delay roughly works)_
 
 _(how rollback-and-chase in this project roughly works)_
 
+![server_clients](./charts/ServerClients.jpg)
 ![rollback_and_chase_intro](./charts/RollbackAndChase.jpg)
+
+(By use of [GopherJs](https://github.com/gopherjs/gopherjs), the frontend codes for dynamics are now automatically generated)
 ![floating_point_accumulation_err](./charts/AvoidingFloatingPointAccumulationErr.jpg)
 
 # 1. Building & running
@@ -27,7 +35,8 @@ _(how rollback-and-chase in this project roughly works)_
 ## 1.1 Tools to install 
 ### Backend
 - [Command Line Tools for Xcode](https://developer.apple.com/download/all/?q=command%20line%20tools) (on OSX) or [TDM-GCC](https://jmeubank.github.io/tdm-gcc/download/) (on Windows) (a `make` executable mandatory)
-- [Golang1.18.6](https://golang.org/dl/) (brought down to 1.18 for GopherJs support, mandatory, in China please try a mirror site like [that of ustc](https://mirrors.ustc.edu.cn/golang/))
+- [Golang1.18.6](https://golang.org/dl/) (brought down to 1.18 for _GopherJs_ support, mandatory, in China please try a mirror site like [that of ustc](https://mirrors.ustc.edu.cn/golang/))
+- [GopherJs1.18.0-beta1](https://github.com/gopherjs/gopherjs/tree/v1.18.0-beta1) (optional, only for developemnt)
 - [MySQL 5.7](https://dev.mysql.com/downloads/windows/installer/5.7.html) (mandatory, for OSX not all versions of 5.7 can be found thus 5.7.24 is recommended)
 - [Redis 3.0.503 or above](https://redis.io/download/) (mandatory)
 - [skeema](https://www.skeema.io/) (optional, only for convenient MySQL schema provisioning)
@@ -60,7 +69,7 @@ user@proj-root/battle_srv/configs> cp -r ./configs.template ./configs
 user@proj-root/frontend/assets/plugin_scripts> cp ./conf.js.template ./conf.js
 ```
 
-## 1.2 Actual building & running
+## 1.3 Actual building & running
 ### Backend 
 ```
 ### The following command runs mysql-server in foreground, it's almost NEVER run in such a way, please find a proper way to run it for yourself
@@ -89,3 +98,48 @@ ErrFatal        {"err": "MISCONF Redis is configured to save RDB snapshots, but
 ```
 
 Just restart your `redis-server` process.
+
+### 2.2 Why not show "PING value" on frontend display? 
+The most important reason for not showing "PING value" is simple: in most games the "PING value" is collected by a dedicated kernel thread which doesn't interfere the UI thread or the primary networking thread. As this demo primarily runs on browser by far, I don't have this capability easily.
+
+Moreover, in practice I found that to spot sync anomalies, the following tools are much more useful than the "PING VALUE".  
+- Detection of [prediction mismatch on the frontend](https://github.com/genxium/DelayNoMore/blob/v0.9.19/frontend/assets/scripts/Map.js#L842).
+- Detection of [type#1 forceConfirmation on the backend](https://github.com/genxium/DelayNoMore/blob/v0.9.19/battle_srv/models/room.go#L1246).
+- Detection of [type#2 forceConfirmation on the backend](https://github.com/genxium/DelayNoMore/blob/v0.9.19/battle_srv/models/room.go#L1259).
+
+There's also some useful information displayed on the frontend when `true == Map.showNetworkDoctorInfo`.
+![networkstats](./charts/networkstats.png)
+
+### 2.3 WIN32 platform tool versioning
+![visual_studio](./charts/VisualStudioSetup.png)
+When building for native platforms, it's much more convenient to trigger the CocosCreator project forming frmo CLI, e.g.
+```
+shell> cd <proj-root>
+shell> /path/to/CocosCreator.exe --path ./frontend --build "platform=win32;debug=true"
+```
+
+### 2.4 CococCreator native build reloading
+CocosCreator doesn't have perfect file cache management during native project building, use "Developer Tools > Reload" to reset the IDE status upon mysterious errors.
+![ccc_reload](./charts/NativeBuildReload.png)
+
+Another issue is with the package name, see the screenshot below, kindly note that after successfully building with a blank package name, you can then re-fill the desired package name and build again! 
+![ccc_package_name](./charts/PackageNameIssueInCcc.png)
+
+### 2.5 Checking UDP port binding result
+__*nix__
+``` 
+netstat -anp | grep <your_port>
+``` 
+
+__Windows__
+``` 
+netstat -ano | grep <your_port>
+``` 
+
+### 2.6 Checking native code crash on non-rooted Android phone 
+```
+DeveloperOs> adb bugreport ./logs.zip
+# The file "logs.zip" will be automatically pulled to current folder of the DeveloperOS, copy "logs/FS/data/tomestones" out of the zip, then use the binary "$NDK_ROOT/ndk-stack" to analyze whichever tombstone you're interested in, for example, I often use the following
+DeveloperOs> ${NDK_ROOT}/ndk-stack.cmd -sym \path\to\DelayNoMore\frontend\build\jsb-link\frameworks\runtime-src\proj.android-studio\app\build\intermediates\ndkBuild\debug\obj\local\arm64-v8a -dump \path\to\tombstones\tombstone_03  
+# The param "-sym \path\to\objs" tells "ndk-stack" to decode "tombstone_03" with symbols provided by all the files inside that "\path\to\objs".
+```

battle_srv/common/conf.go

@@ -37,6 +37,8 @@ type mysqlConf struct {
 
 type sioConf struct {
 	HostAndPort string `json:"hostAndPort"`
+	UdpHost     string `json:"udpHost"`
+	UdpPort     int    `json:"udpPort"`
 }
 
 type botServerConf struct {

battle_srv/configs.template/sio.json

@@ -1,3 +1,5 @@
 {
-  "hostAndPort": "0.0.0.0:9992" 
+  "hostAndPort": "0.0.0.0:9992", 
+  "udpHost": "0.0.0.0", 
+  "udpPort": 3000 
 }

battle_srv/main.go

@@ -23,6 +23,8 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/robfig/cron"
 	"go.uber.org/zap"
+
+	"net"
 )
 
 func main() {
@@ -34,7 +36,7 @@ func main() {
 		env_tools.MergeTestPlayerAccounts()
 	}
 	models.InitRoomHeapManager()
-	startScheduler()
+	// startScheduler()
 	router := gin.Default()
 	setRouter(router)
 
@@ -54,6 +56,7 @@ func main() {
 		}
 		Logger.Info("Listening and serving HTTP on", zap.Any("Conf.Sio.HostAndPort", Conf.Sio.HostAndPort))
 	}()
+	go startGrandUdpServer()
 	var gracefulStop = make(chan os.Signal)
 	signal.Notify(gracefulStop, syscall.SIGTERM)
 	signal.Notify(gracefulStop, syscall.SIGINT)
@@ -89,6 +92,7 @@ func setRouter(router *gin.Engine) {
 	router.StaticFS("/asset", http.Dir(filepath.Join(Conf.General.AppRoot, "asset")))
 	router.GET("/ping", f)
 	router.GET("/tsrht", ws.Serve)
+	router.GET("/tsrhtSecondary", ws.HandleSecondaryWsSessionForPlayer)
 
 	apiRouter := router.Group("/api")
 	{
@@ -113,3 +117,33 @@ func startScheduler() {
 	//c.AddFunc("*/1 * * * * *", FuncName)
 	c.Start()
 }
+
+func startGrandUdpServer() {
+	conn, err := net.ListenUDP("udp", &net.UDPAddr{
+		Port: Conf.Sio.UdpPort,
+		IP:   net.ParseIP(Conf.Sio.UdpHost),
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	defer func() {
+		conn.Close()
+		if r := recover(); r != nil {
+			Logger.Error("`GrandUdpServer`, recovery spot#1, recovered from: ", zap.Any("panic", r))
+		}
+		Logger.Info(fmt.Sprintf("The `GrandUdpServer` is stopped"))
+	}()
+
+	Logger.Info(fmt.Sprintf("`GrandUdpServer` started at %s", conn.LocalAddr().String()))
+
+	for {
+		message := make([]byte, 2046)
+		rlen, remote, err := conn.ReadFromUDP(message[:])
+		if err != nil {
+			panic(err)
+		}
+		Logger.Info(fmt.Sprintf("`GrandUdpServer` received: %d bytes from %s\n", rlen, remote))
+		ws.HandleUdpHolePunchingForPlayer(message[0:rlen], remote)
+	}
+}

battle_srv/models/pb_type_convert.go

@@ -10,67 +10,132 @@ func toPbRoomDownsyncFrame(rdf *battle.RoomDownsyncFrame) *pb.RoomDownsyncFrame
 		return nil
 	}
 	ret := &pb.RoomDownsyncFrame{
-		Id:                       rdf.Id,
-		PlayersArr:               make([]*pb.PlayerDownsync, len(rdf.PlayersArr), len(rdf.PlayersArr)),
-		MeleeBullets:             make([]*pb.MeleeBullet, len(rdf.MeleeBullets), len(rdf.MeleeBullets)),
-		CountdownNanos:           rdf.CountdownNanos,
-		BackendUnconfirmedMask:   rdf.BackendUnconfirmedMask,
-		ShouldForceResync:        rdf.ShouldForceResync,
-		PlayerOpPatternToSkillId: make(map[int32]int32),
+		Id:                     rdf.Id,
+		PlayersArr:             make([]*pb.PlayerDownsync, len(rdf.PlayersArr), len(rdf.PlayersArr)),
+		BulletLocalIdCounter:   rdf.BulletLocalIdCounter,
+		MeleeBullets:           make([]*pb.MeleeBullet, len(rdf.MeleeBullets), len(rdf.MeleeBullets)),
+		FireballBullets:        make([]*pb.FireballBullet, len(rdf.FireballBullets), len(rdf.FireballBullets)),
+		CountdownNanos:         rdf.CountdownNanos,
+		BackendUnconfirmedMask: rdf.BackendUnconfirmedMask,
+		ShouldForceResync:      rdf.ShouldForceResync,
 	}
 
 	for i, last := range rdf.PlayersArr {
 		pbPlayer := &pb.PlayerDownsync{
-			Id:              last.Id,
-			VirtualGridX:    last.VirtualGridX,
-			VirtualGridY:    last.VirtualGridY,
-			DirX:            last.DirX,
-			DirY:            last.DirY,
-			VelX:            last.VelX,
-			VelY:            last.VelY,
-			Speed:           last.Speed,
-			BattleState:     last.BattleState,
-			CharacterState:  last.CharacterState,
-			InAir:           last.InAir,
-			JoinIndex:       last.JoinIndex,
-			ColliderRadius:  last.ColliderRadius,
-			Score:           last.Score,
-			FramesToRecover: last.FramesToRecover,
-			Hp:              last.Hp,
-			MaxHp:           last.MaxHp,
-			Removed:         last.Removed,
+			Id:                  last.Id,
+			VirtualGridX:        last.VirtualGridX,
+			VirtualGridY:        last.VirtualGridY,
+			DirX:                last.DirX,
+			DirY:                last.DirY,
+			VelX:                last.VelX,
+			VelY:                last.VelY,
+			FramesToRecover:     last.FramesToRecover,
+			FramesInChState:     last.FramesInChState,
+			ActiveSkillId:       last.ActiveSkillId,
+			ActiveSkillHit:      last.ActiveSkillHit,
+			FramesInvinsible:    last.FramesInvinsible,
+			Speed:               last.Speed,
+			BattleState:         last.BattleState,
+			CharacterState:      last.CharacterState,
+			InAir:               last.InAir,
+			OnWall:              last.OnWall,
+			OnWallNormX:         last.OnWallNormX,
+			OnWallNormY:         last.OnWallNormY,
+			CapturedByInertia:   last.CapturedByInertia,
+			JoinIndex:           last.JoinIndex,
+			BulletTeamId:        last.BulletTeamId,
+			ChCollisionTeamId:   last.ChCollisionTeamId,
+			Hp:                  last.Hp,
+			MaxHp:               last.MaxHp,
+			RevivalVirtualGridX: last.RevivalVirtualGridX,
+			RevivalVirtualGridY: last.RevivalVirtualGridY,
+			ColliderRadius:      last.ColliderRadius,
+			Score:               last.Score,
+			Removed:             last.Removed,
 		}
 		ret.PlayersArr[i] = pbPlayer
 	}
 
 	for i, last := range rdf.MeleeBullets {
 		pbBullet := &pb.MeleeBullet{
-			BattleLocalId:         last.BattleLocalId,
-			StartupFrames:         last.StartupFrames,
-			ActiveFrames:          last.ActiveFrames,
-			RecoveryFrames:        last.RecoveryFrames,
-			RecoveryFramesOnBlock: last.RecoveryFramesOnBlock,
-			RecoveryFramesOnHit:   last.RecoveryFramesOnHit,
-			HitboxOffset:          last.HitboxOffset,
-			HitStunFrames:         last.HitStunFrames,
-			BlockStunFrames:       last.BlockStunFrames,
-			Pushback:              last.Pushback,
-			ReleaseTriggerType:    last.ReleaseTriggerType,
-			Damage:                last.Damage,
+			BulletLocalId:           last.BattleAttr.BulletLocalId,
+			OriginatedRenderFrameId: last.BattleAttr.OriginatedRenderFrameId,
+			OffenderJoinIndex:       last.BattleAttr.OffenderJoinIndex,
+			TeamId:                  last.BattleAttr.TeamId,
 
-			SelfMoveforwardX: last.SelfMoveforwardX,
-			SelfMoveforwardY: last.SelfMoveforwardY,
-			HitboxSizeX:      last.HitboxSizeX,
-			HitboxSizeY:      last.HitboxSizeY,
+			StartupFrames:      last.Bullet.StartupFrames,
+			CancellableStFrame: last.Bullet.CancellableStFrame,
+			CancellableEdFrame: last.Bullet.CancellableEdFrame,
+			ActiveFrames:       last.Bullet.ActiveFrames,
 
-			OffenderJoinIndex: last.OffenderJoinIndex,
-			OffenderPlayerId:  last.OffenderPlayerId,
+			HitStunFrames:   last.Bullet.HitStunFrames,
+			BlockStunFrames: last.Bullet.BlockStunFrames,
+			PushbackVelX:    last.Bullet.PushbackVelX,
+			PushbackVelY:    last.Bullet.PushbackVelY,
+			Damage:          last.Bullet.Damage,
+
+			SelfLockVelX: last.Bullet.SelfLockVelX,
+			SelfLockVelY: last.Bullet.SelfLockVelY,
+
+			HitboxOffsetX: last.Bullet.HitboxOffsetX,
+			HitboxOffsetY: last.Bullet.HitboxOffsetY,
+			HitboxSizeX:   last.Bullet.HitboxSizeX,
+			HitboxSizeY:   last.Bullet.HitboxSizeY,
+
+			BlowUp: last.Bullet.BlowUp,
+
+			SpeciesId:       last.Bullet.SpeciesId,
+			ExplosionFrames: last.Bullet.ExplosionFrames,
+
+			BlState:         last.BlState,
+			FramesInBlState: last.FramesInBlState,
 		}
 		ret.MeleeBullets[i] = pbBullet
 	}
 
-	for i, last := range rdf.PlayerOpPatternToSkillId {
-		ret.PlayerOpPatternToSkillId[int32(i)] = int32(last)
+	for i, last := range rdf.FireballBullets {
+		pbBullet := &pb.FireballBullet{
+			BulletLocalId:           last.BattleAttr.BulletLocalId,
+			OriginatedRenderFrameId: last.BattleAttr.OriginatedRenderFrameId,
+			OffenderJoinIndex:       last.BattleAttr.OffenderJoinIndex,
+			TeamId:                  last.BattleAttr.TeamId,
+
+			StartupFrames:      last.Bullet.StartupFrames,
+			CancellableStFrame: last.Bullet.CancellableStFrame,
+			CancellableEdFrame: last.Bullet.CancellableEdFrame,
+			ActiveFrames:       last.Bullet.ActiveFrames,
+
+			HitStunFrames:   last.Bullet.HitStunFrames,
+			BlockStunFrames: last.Bullet.BlockStunFrames,
+			PushbackVelX:    last.Bullet.PushbackVelX,
+			PushbackVelY:    last.Bullet.PushbackVelY,
+			Damage:          last.Bullet.Damage,
+
+			SelfLockVelX: last.Bullet.SelfLockVelX,
+			SelfLockVelY: last.Bullet.SelfLockVelY,
+
+			HitboxOffsetX: last.Bullet.HitboxOffsetX,
+			HitboxOffsetY: last.Bullet.HitboxOffsetY,
+			HitboxSizeX:   last.Bullet.HitboxSizeX,
+			HitboxSizeY:   last.Bullet.HitboxSizeY,
+
+			BlowUp: last.Bullet.BlowUp,
+
+			SpeciesId:       last.Bullet.SpeciesId,
+			ExplosionFrames: last.Bullet.ExplosionFrames,
+
+			BlState:         last.BlState,
+			FramesInBlState: last.FramesInBlState,
+
+			VirtualGridX: last.VirtualGridX,
+			VirtualGridY: last.VirtualGridY,
+			DirX:         last.DirX,
+			DirY:         last.DirY,
+			VelX:         last.VelX,
+			VelY:         last.VelY,
+			Speed:        last.Speed,
+		}
+		ret.FireballBullets[i] = pbBullet
 	}
 
 	return ret
@@ -84,22 +149,36 @@ func toPbPlayers(modelInstances map[int32]*Player, withMetaInfo bool) []*pb.Play
 
 	for _, last := range modelInstances {
 		pbPlayer := &pb.PlayerDownsync{
-			Id:              last.Id,
-			VirtualGridX:    last.VirtualGridX,
-			VirtualGridY:    last.VirtualGridY,
-			DirX:            last.DirX,
-			DirY:            last.DirY,
-			VelX:            last.VelX,
-			VelY:            last.VelY,
-			Speed:           last.Speed,
-			BattleState:     last.BattleState,
-			CharacterState:  last.CharacterState,
-			InAir:           last.InAir,
-			JoinIndex:       last.JoinIndex,
-			ColliderRadius:  last.ColliderRadius,
-			Score:           last.Score,
-			Removed:         last.Removed,
-			FramesToRecover: last.FramesToRecover,
+			Id:                  last.Id,
+			VirtualGridX:        last.VirtualGridX,
+			VirtualGridY:        last.VirtualGridY,
+			DirX:                last.DirX,
+			DirY:                last.DirY,
+			VelX:                last.VelX,
+			VelY:                last.VelY,
+			FramesToRecover:     last.FramesToRecover,
+			FramesInChState:     last.FramesInChState,
+			ActiveSkillId:       last.ActiveSkillId,
+			ActiveSkillHit:      last.ActiveSkillHit,
+			FramesInvinsible:    last.FramesInvinsible,
+			Speed:               last.Speed,
+			BattleState:         last.BattleState,
+			CharacterState:      last.CharacterState,
+			InAir:               last.InAir,
+			OnWall:              last.OnWall,
+			OnWallNormX:         last.OnWallNormX,
+			OnWallNormY:         last.OnWallNormY,
+			CapturedByInertia:   last.CapturedByInertia,
+			JoinIndex:           last.JoinIndex,
+			BulletTeamId:        last.BulletTeamId,
+			ChCollisionTeamId:   last.ChCollisionTeamId,
+			Hp:                  last.Hp,
+			MaxHp:               last.MaxHp,
+			RevivalVirtualGridX: last.RevivalVirtualGridX,
+			RevivalVirtualGridY: last.RevivalVirtualGridY,
+			ColliderRadius:      last.ColliderRadius,
+			Score:               last.Score,
+			Removed:             last.Removed,
 		}
 		if withMetaInfo {
 			pbPlayer.Name = last.Name
@@ -120,21 +199,36 @@ func toJsPlayers(modelInstances map[int32]*Player) []*battle.PlayerDownsync {
 
 	for _, last := range modelInstances {
 		toRet[last.JoinIndex-1] = &battle.PlayerDownsync{
-			Id:             last.Id,
-			VirtualGridX:   last.VirtualGridX,
-			VirtualGridY:   last.VirtualGridY,
-			DirX:           last.DirX,
-			DirY:           last.DirY,
-			VelX:           last.VelX,
-			VelY:           last.VelY,
-			Speed:          last.Speed,
-			BattleState:    last.BattleState,
-			CharacterState: last.CharacterState,
-			InAir:          last.InAir,
-			JoinIndex:      last.JoinIndex,
-			ColliderRadius: last.ColliderRadius,
-			Score:          last.Score,
-			Removed:        last.Removed,
+			Id:                  last.Id,
+			VirtualGridX:        last.VirtualGridX,
+			VirtualGridY:        last.VirtualGridY,
+			DirX:                last.DirX,
+			DirY:                last.DirY,
+			VelX:                last.VelX,
+			VelY:                last.VelY,
+			FramesToRecover:     last.FramesToRecover,
+			FramesInChState:     last.FramesInChState,
+			ActiveSkillId:       last.ActiveSkillId,
+			ActiveSkillHit:      last.ActiveSkillHit,
+			FramesInvinsible:    last.FramesInvinsible,
+			Speed:               last.Speed,
+			BattleState:         last.BattleState,
+			CharacterState:      last.CharacterState,
+			JoinIndex:           last.JoinIndex,
+			BulletTeamId:        last.BulletTeamId,
+			ChCollisionTeamId:   last.ChCollisionTeamId,
+			Hp:                  last.Hp,
+			MaxHp:               last.MaxHp,
+			RevivalVirtualGridX: last.RevivalVirtualGridX,
+			RevivalVirtualGridY: last.RevivalVirtualGridY,
+			ColliderRadius:      last.ColliderRadius,
+			InAir:               last.InAir,
+			OnWall:              last.OnWall,
+			OnWallNormX:         last.OnWallNormX,
+			OnWallNormY:         last.OnWallNormY,
+			CapturedByInertia:   last.CapturedByInertia,
+			Score:               last.Score,
+			Removed:             last.Removed,
 		}
 	}
 

battle_srv/models/player.go

@@ -8,6 +8,7 @@ import (
 	sq "github.com/Masterminds/squirrel"
 	"github.com/jmoiron/sqlx"
 	"go.uber.org/zap"
+	"net"
 )
 
 type PlayerBattleState struct {
@@ -46,9 +47,15 @@ type Player struct {
 	TutorialStage int       `db:"tutorial_stage"`
 
 	// other in-battle info fields
-	LastSentInputFrameId int32
-	AckingFrameId        int32
-	AckingInputFrameId   int32
+	LastReceivedInputFrameId    int32
+	LastUdpReceivedInputFrameId int32
+	LastSentInputFrameId        int32
+	AckingFrameId               int32
+	AckingInputFrameId          int32
+
+	UdpAddr                *PeerUdpAddr
+	BattleUdpTunnelAddr    *net.UDPAddr // This addr is used by backend only, not visible to frontend
+	BattleUdpTunnelAuthKey int32
 }
 
 func ExistPlayerByName(name string) (bool, error) {

battle_srv/ws/serve.go

@@ -10,6 +10,7 @@ import (
 	"github.com/golang/protobuf/proto"
 	"github.com/gorilla/websocket"
 	"go.uber.org/zap"
+	"net"
 	"net/http"
 	"strconv"
 	"sync/atomic"
@@ -46,6 +47,7 @@ func Serve(c *gin.Context) {
 		c.AbortWithStatus(http.StatusBadRequest)
 		return
 	}
+
 	boundRoomId := 0
 	expectedRoomId := 0
 	var err error
@@ -240,46 +242,40 @@ func Serve(c *gin.Context) {
 
 		// Construct "battleColliderInfo" to downsync
 		bciFrame := &pb.BattleColliderInfo{
-			BoundRoomId:    pRoom.Id,
-			StageName:      pRoom.StageName,
-			StageDiscreteW: pRoom.StageDiscreteW,
-			StageDiscreteH: pRoom.StageDiscreteH,
-			StageTileW:     pRoom.StageTileW,
-			StageTileH:     pRoom.StageTileH,
+			BoundRoomId: pRoom.Id,
+			StageName:   pRoom.StageName,
+
+			IntervalToPing:        int32(Constants.Ws.IntervalToPing),
+			WillKickIfInactiveFor: int32(Constants.Ws.WillKickIfInactiveFor),
+			BattleDurationNanos:   pRoom.BattleDurationNanos,
 
-			IntervalToPing:                  int32(Constants.Ws.IntervalToPing),
-			WillKickIfInactiveFor:           int32(Constants.Ws.WillKickIfInactiveFor),
-			BattleDurationNanos:             pRoom.BattleDurationNanos,
-			ServerFps:                       pRoom.ServerFps,
-			InputDelayFrames:                pRoom.InputDelayFrames,
-			InputScaleFrames:                pRoom.InputScaleFrames,
-			NstDelayFrames:                  pRoom.NstDelayFrames,
 			InputFrameUpsyncDelayTolerance:  pRoom.InputFrameUpsyncDelayTolerance,
 			MaxChasingRenderFramesPerUpdate: pRoom.MaxChasingRenderFramesPerUpdate,
-			PlayerBattleState:               pThePlayer.BattleState, // For frontend to know whether it's rejoining
 			RollbackEstimatedDtMillis:       pRoom.RollbackEstimatedDtMillis,
 			RollbackEstimatedDtNanos:        pRoom.RollbackEstimatedDtNanos,
 
-			WorldToVirtualGridRatio: pRoom.WorldToVirtualGridRatio,
-			VirtualGridToWorldRatio: pRoom.VirtualGridToWorldRatio,
+			SpaceOffsetX: pRoom.SpaceOffsetX,
+			SpaceOffsetY: pRoom.SpaceOffsetY,
 
-			SpAtkLookupFrames:         pRoom.SpAtkLookupFrames,
-			RenderCacheSize:           pRoom.RenderCacheSize,
-			SnapIntoPlatformOverlap:   pRoom.SnapIntoPlatformOverlap,
-			SnapIntoPlatformThreshold: pRoom.SnapIntoPlatformThreshold,
-			JumpingInitVelY:           pRoom.JumpingInitVelY,
-			GravityX:                  pRoom.GravityX,
-			GravityY:                  pRoom.GravityY,
-			CollisionMinStep:          pRoom.CollisionMinStep,
+			RenderCacheSize:   pRoom.RenderCacheSize,
+			CollisionMinStep:  pRoom.CollisionMinStep,
+			BoundRoomCapacity: int32(pRoom.Capacity),
+
+			BattleUdpTunnel: &pb.PeerUdpAddr{
+				Ip:      pRoom.BattleUdpTunnelAddr.Ip,
+				Port:    pRoom.BattleUdpTunnelAddr.Port,
+				AuthKey: pThePlayer.BattleUdpTunnelAuthKey,
+			},
 
 			FrameDataLoggingEnabled: pRoom.FrameDataLoggingEnabled,
 		}
 
 		resp := &pb.WsResp{
-			Ret:         int32(Constants.RetCode.Ok),
-			EchoedMsgId: int32(0),
-			Act:         models.DOWNSYNC_MSG_ACT_HB_REQ,
-			BciFrame:    bciFrame,
+			Ret:           int32(Constants.RetCode.Ok),
+			EchoedMsgId:   int32(0),
+			Act:           models.DOWNSYNC_MSG_ACT_HB_REQ,
+			BciFrame:      bciFrame,
+			PeerJoinIndex: pThePlayer.JoinIndex,
 		}
 
 		Logger.Debug("Sending downsync HeartbeatRequirements:", zap.Any("roomId", pRoom.Id), zap.Any("playerId", playerId), zap.Any("resp", resp))
@@ -392,7 +388,7 @@ func Serve(c *gin.Context) {
 				startOrFeedHeartbeatWatchdog(conn)
 			case models.UPSYNC_MSG_ACT_PLAYER_CMD:
 				startOrFeedHeartbeatWatchdog(conn)
-				pRoom.OnBattleCmdReceived(pReq)
+				pRoom.OnBattleCmdReceived(pReq, false)
 			case models.UPSYNC_MSG_ACT_PLAYER_COLLIDER_ACK:
 				res := pRoom.OnPlayerBattleColliderAcked(int32(playerId))
 				if false == res {
@@ -409,3 +405,118 @@ func Serve(c *gin.Context) {
 	startOrFeedHeartbeatWatchdog(conn)
 	go receivingLoopAgainstPlayer()
 }
+
+func HandleSecondaryWsSessionForPlayer(c *gin.Context) {
+	token, ok := c.GetQuery("intAuthToken")
+	if !ok {
+		Logger.Warn("Secondary ws session req must have intAuthToken param!")
+		c.AbortWithStatus(http.StatusBadRequest)
+		return
+	}
+
+	boundRoomId := 0
+	var err error = nil
+	if boundRoomIdStr, hasBoundRoomId := c.GetQuery("boundRoomId"); hasBoundRoomId {
+		boundRoomId, err = strconv.Atoi(boundRoomIdStr)
+		if err != nil {
+			c.AbortWithStatus(http.StatusBadRequest)
+			return
+		}
+	} else {
+		Logger.Warn("Secondary ws session req must have boundRoomId param:", zap.Any("intAuthToken", token))
+		c.AbortWithStatus(http.StatusBadRequest)
+		return
+	}
+
+	var pRoom *models.Room = nil
+	// Deliberately querying playerId after querying room, because the former is against persistent storage and could be slow!
+	if tmpPRoom, existent := (*models.RoomMapManagerIns)[int32(boundRoomId)]; !existent {
+		Logger.Warn("Secondary ws session failed to get:\n", zap.Any("intAuthToken", token), zap.Any("forBoundRoomId", boundRoomId))
+		c.AbortWithStatus(http.StatusBadRequest)
+	} else {
+		pRoom = tmpPRoom
+	}
+
+	// TODO: Wrap the following 2 stmts by sql transaction!
+	playerId, err := models.GetPlayerIdByToken(token)
+	if err != nil || playerId == 0 {
+		// TODO: Abort with specific message.
+		Logger.Warn("Secondary ws session playerLogin record not found:", zap.Any("intAuthToken", token))
+		c.AbortWithStatus(http.StatusBadRequest)
+		return
+	}
+
+	Logger.Info("Secondary ws session playerLogin record has been found:", zap.Any("playerId", playerId), zap.Any("intAuthToken", token), zap.Any("boundRoomId", boundRoomId))
+
+	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		Logger.Error("Secondary ws session upgrade:", zap.Error(err), zap.Any("playerId", playerId))
+		c.AbortWithStatus(http.StatusBadRequest)
+		return
+	}
+
+	connHasBeenSignaledToClose := int32(0)
+	pConnHasBeenSignaledToClose := &connHasBeenSignaledToClose
+
+	signalToCloseConnOfThisPlayer := func(customRetCode int, customRetMsg string) {
+		if swapped := atomic.CompareAndSwapInt32(pConnHasBeenSignaledToClose, 0, 1); !swapped {
+			return
+		}
+		Logger.Warn("Secondary ws session signalToCloseConnOfThisPlayer:", zap.Any("playerId", playerId), zap.Any("customRetCode", customRetCode), zap.Any("customRetMsg", customRetMsg))
+		defer func() {
+			if r := recover(); r != nil {
+				Logger.Error("Secondary ws session recovered from: ", zap.Any("panic", r))
+			}
+		}()
+
+		closeMessage := websocket.FormatCloseMessage(customRetCode, customRetMsg)
+		err := conn.WriteControl(websocket.CloseMessage, closeMessage, time.Now().Add(time.Millisecond*(ConstVals.Ws.WillKickIfInactiveFor)))
+		if err != nil {
+			Logger.Error("Secondary ws session unable to send the CloseFrame control message to player(client-side):", zap.Any("playerId", playerId), zap.Error(err))
+		}
+
+		time.AfterFunc(3*time.Second, func() {
+			// To actually terminates the underlying TCP connection which might be in `CLOSE_WAIT` state if inspected by `netstat`.
+			conn.Close()
+		})
+	}
+
+	onReceivedCloseMessageFromClient := func(code int, text string) error {
+		Logger.Warn("Secondary ws session triggered `onReceivedCloseMessageFromClient`:", zap.Any("code", code), zap.Any("playerId", playerId), zap.Any("message", text))
+		signalToCloseConnOfThisPlayer(code, text)
+		return nil
+	}
+
+	conn.SetCloseHandler(onReceivedCloseMessageFromClient)
+
+	pRoom.SetSecondarySession(int32(playerId), conn, signalToCloseConnOfThisPlayer)
+}
+
+func HandleUdpHolePunchingForPlayer(message []byte, peerAddr *net.UDPAddr) {
+	pReq := new(pb.HolePunchUpsync)
+	if unmarshalErr := proto.Unmarshal(message, pReq); nil != unmarshalErr {
+		Logger.Error("`GrandUdpServer` failed to unmarshal", zap.Error(unmarshalErr))
+		return
+	}
+
+	token := pReq.IntAuthToken
+	boundRoomId := pReq.BoundRoomId
+
+	pRoom, existent := (*models.RoomMapManagerIns)[int32(boundRoomId)]
+	// Deliberately querying playerId after querying room, because the former is against persistent storage and could be slow!
+	if !existent {
+		Logger.Warn("`GrandUdpServer` failed to get:\n", zap.Any("intAuthToken", token), zap.Any("forBoundRoomId", boundRoomId))
+		return
+	}
+
+	// TODO: Wrap the following 2 stmts by sql transaction!
+	playerId, err := models.GetPlayerIdByToken(token)
+	if err != nil || playerId == 0 {
+		// TODO: Abort with specific message.
+		Logger.Warn("`GrandUdpServer` playerLogin record not found for:", zap.Any("intAuthToken", token))
+		return
+	}
+
+	Logger.Info("`GrandUdpServer` playerLogin record has been found:", zap.Any("playerId", playerId), zap.Any("intAuthToken", token), zap.Any("boundRoomId", boundRoomId), zap.Any("peerAddr", peerAddr))
+	pRoom.UpdatePeerUdpAddrList(int32(playerId), peerAddr, pReq)
+}

charts/README.md

@@ -14,3 +14,15 @@ ffmpeg -vsync vfr -i input.gif output%d.png
 ```
 
 The `-vsync vfr` tells ffmpeg to disrespect the original delays set within the GIF file, otherwise many duplicate frame will be extracted by the default 60FPS.
+
+More complicated transparent padding example (used when alignment in image source is much more preferred than aligning in codes) 
+```
+ffmpeg -vsync vfr -i LayDown1.gif -vf "scale=iw:188:force_original_aspect_ratio=decrease,pad=iw:188:0:(oh-ih):color=#00000000,format=rgba" pngs/LayDown1_%d.png
+```
+
+The command above uses same input-output width, but pads the output height with a top transparent section such that the output height is fixed to 188px. 
+
+Similarly to crop a gif into pngs.
+```
+ffmpeg -vsync vfr -i Idle1.gif -vf "crop=70:ih:(iw-ow-10):0" pngs/Idle1_%d.png
+```

collider_visualizer/README.md

@@ -0,0 +1 @@
+This module is no longer useful, as we can now use GopherJs+OfflineMap to visualize experimental game dynamics.

dnmshared/go.mod

@@ -4,8 +4,10 @@ go 1.18
 
 require (
 	resolv v0.0.0
+	jsexport v0.0.0
 )
 
 replace (
 	resolv => ../resolv_tailored
+	jsexport => ../jsexport
 )

frontend/assets/plugin_scripts/NetworkDoctor.js

@@ -1,66 +0,0 @@
-function NetworkDoctor(serverFps, clientUpsyncFps) {
-  this.serverFps = serverFps;
-  this.clientUpsyncFps = clientUpsyncFps;
-  this.millisPerServerFrame = parseInt(1000 / this.serverFps);
-  this._tooLongSinceLastFrameDiffReceivedThreshold = (this.millisPerServerFrame << 6);
-
-  this.setupFps = function(fps) {
-    this.serverFps = this.clientUpsyncFps = fps;
-    this.millisPerServerFrame = parseInt(1000 / this.serverFps);
-    this._tooLongSinceLastFrameDiffReceivedThreshold = (this.millisPerServerFrame << 6);
-  }
-
-  this._lastFrameDiffRecvTime = null;
-  this._tooLongSinceLastFrameDiffReceived = function() {
-    if (undefined === this._lastFrameDiffRecvTime || null === this._lastFrameDiffRecvTime) return false;
-    return (this._tooLongSinceLastFrameDiffReceivedThreshold <= (Date.now() - this._lastFrameDiffRecvTime));
-  };
-
-  this._consecutiveALittleLongFrameDiffReceivedIntervalCount = 0;
-  this._consecutiveALittleLongFrameDiffReceivedIntervalCountThreshold = 120;
-
-  this.onNewFrameDiffReceived = function(frameDiff) {
-    var now = Date.now();
-    if (undefined !== this._lastFrameDiffRecvTime && null !== this._lastFrameDiffRecvTime) {
-      var intervalFromLastFrameDiff = (now - this._lastFrameDiffRecvTime);
-      if ((this.millisPerServerFrame << 5) < intervalFromLastFrameDiff) {
-        ++this._consecutiveALittleLongFrameDiffReceivedIntervalCount;
-        console.log('Medium delay, intervalFromLastFrameDiff is', intervalFromLastFrameDiff);
-      } else {
-        this._consecutiveALittleLongFrameDiffReceivedIntervalCount = 0;
-      }
-    }
-    this._lastFrameDiffRecvTime = now;
-  };
-
-  this._networkComplaintPrefix = "\nNetwork is not good >_<\n";
-
-  this.generateNetworkComplaint = function(excludeTypeConstantALittleLongFrameDiffReceivedInterval, excludeTypeTooLongSinceLastFrameDiffReceived) {
-    if (this.hasBattleStopped) return null;
-    var shouldComplain = false;
-    var ret = this._networkComplaintPrefix;
-    if (true != excludeTypeConstantALittleLongFrameDiffReceivedInterval && this._consecutiveALittleLongFrameDiffReceivedIntervalCountThreshold <= this._consecutiveALittleLongFrameDiffReceivedIntervalCount) {
-      this._consecutiveALittleLongFrameDiffReceivedIntervalCount = 0;
-      ret += "\nConstantly having a little long recv interval.\n";
-      shouldComplain = true;
-    }
-    if (true != excludeTypeTooLongSinceLastFrameDiffReceived && this._tooLongSinceLastFrameDiffReceived()) {
-      ret += "\nToo long since last received frameDiff.\n";
-      shouldComplain = true;
-    }
-    return (shouldComplain ? ret : null);
-  };
-
-  this.hasBattleStopped = false;
-  this.onBattleStopped = function() {
-    this.hasBattleStopped = true;
-  };
-
-  this.isClientSessionConnected = function() {
-    if (!window.game) return false;
-    if (!window.game.clientSession) return false;
-    return window.game.clientSession.connected; 
-  };
-}
-
-window.NetworkDoctor = NetworkDoctor;

frontend/assets/plugin_scripts/auxiliaries.js

@@ -198,3 +198,6 @@ window.getOrCreateAnimationClipForGid = function(gid, tiledMapInfo, tilesElListU
     animationClip: animClip,
   };
 };
+
+// Node.js, this is a workaround to avoid accessing the non-existent "TextDecoder class" from "jsexport.js".
+window.fs = function() {};

frontend/assets/resources/animation/Explosion.meta

@@ -0,0 +1,7 @@
+{
+  "ver": "1.0.1",
+  "uuid": "c7c2ac6e-f1ea-4233-b6a4-aa5b96b61e17",
+  "isSubpackage": false,
+  "subpackageName": "",
+  "subMetas": {}
+}

frontend/assets/resources/animation/Explosion/Fireball1Explosion.anim

@@ -0,0 +1,55 @@
+{
+  "__type__": "cc.AnimationClip",
+  "_name": "Fireball1Explosion",
+  "_objFlags": 0,
+  "_native": "",
+  "_duration": 0.5,
+  "sample": 60,
+  "speed": 1,
+  "wrapMode": 1,
+  "curveData": {
+    "comps": {
+      "cc.Sprite": {
+        "spriteFrame": [
+          {
+            "frame": 0,
+            "value": {
+              "__uuid__": "f4ad4f9f-4890-450b-9334-68fe6b903893"
+            }
+          },
+          {
+            "frame": 0.05,
+            "value": {
+              "__uuid__": "c6a5994f-251d-4191-a550-dfef979bab59"
+            }
+          },
+          {
+            "frame": 0.11666666666666667,
+            "value": {
+              "__uuid__": "417e58d9-e364-47f7-9364-f31ad3452adc"
+            }
+          },
+          {
+            "frame": 0.16666666666666666,
+            "value": {
+              "__uuid__": "8b566f26-b34d-4da6-bdaa-078358a5b685"
+            }
+          },
+          {
+            "frame": 0.31666666666666665,
+            "value": {
+              "__uuid__": "6ec5f75d-307e-4292-b667-cbbb5a52c2f6"
+            }
+          },
+          {
+            "frame": 0.48333333333333334,
+            "value": {
+              "__uuid__": "d89977f1-d927-4a08-9591-9feb1daf68c8"
+            }
+          }
+        ]
+      }
+    }
+  },
+  "events": []
+}

frontend/assets/resources/animation/Explosion/Fireball1Explosion.anim.meta

@@ -0,0 +1,5 @@
+{
+  "ver": "2.1.0",
+  "uuid": "7941215a-2b8c-4798-954b-4f1b16d5f6f5",
+  "subMetas": {}
+}

frontend/assets/resources/animation/Explosion/Fireball2Explosion.anim

@@ -0,0 +1,85 @@
+{
+  "__type__": "cc.AnimationClip",
+  "_name": "Fireball2Explosion",
+  "_objFlags": 0,
+  "_native": "",
+  "_duration": 0.5,
+  "sample": 60,
+  "speed": 1,
+  "wrapMode": 1,
+  "curveData": {
+    "comps": {
+      "cc.Sprite": {
+        "spriteFrame": [
+          {
+            "frame": 0,
+            "value": {
+              "__uuid__": "a1979f05-3ecc-4d70-9ea9-7822e35602c3"
+            }
+          },
+          {
+            "frame": 0.05,
+            "value": {
+              "__uuid__": "850884ca-2e6a-4d04-94d9-fd929ac33942"
+            }
+          },
+          {
+            "frame": 0.08333333333333333,
+            "value": {
+              "__uuid__": "88b9c254-1fd8-451f-902e-4a43a7ef5d51"
+            }
+          },
+          {
+            "frame": 0.13333333333333333,
+            "value": {
+              "__uuid__": "566342a3-cfde-44c9-afbe-7d9469653ccb"
+            }
+          },
+          {
+            "frame": 0.18333333333333332,
+            "value": {
+              "__uuid__": "d1620a98-de62-4069-8910-122f361d22a4"
+            }
+          },
+          {
+            "frame": 0.23333333333333334,
+            "value": {
+              "__uuid__": "2e9ed070-e592-4e77-8fa1-c5250deb006b"
+            }
+          },
+          {
+            "frame": 0.2833333333333333,
+            "value": {
+              "__uuid__": "a3e8357d-39da-42e8-b26b-f5ae7a68aed7"
+            }
+          },
+          {
+            "frame": 0.3333333333333333,
+            "value": {
+              "__uuid__": "3f3cb45c-732d-4bea-89b4-5495fb0d2c37"
+            }
+          },
+          {
+            "frame": 0.38333333333333336,
+            "value": {
+              "__uuid__": "d7aeb01a-4e04-4037-a2c4-ba72f45f69f3"
+            }
+          },
+          {
+            "frame": 0.43333333333333335,
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frontend/assets/resources/animation/Monk/Atk4.anim.meta

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