Merge pull request #16 from genxium/gopherjs

Employed Gopherjs into unified game dynamics codegen.
Minor fix.
2025-10-17 12:36:46 +00:00 · 2022-12-29 15:11:37 +08:00 · 2022-12-29 15:06:06 +08:00 · 2022-12-29 15:03:40 +08:00 · 2022-12-29 14:09:56 +08:00 · 2022-12-29 12:21:01 +08:00
109 changed files with 11018 additions and 17827 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -132,3 +132,5 @@ gradle/*
 *.project

 *~
+jsexport/jsexport.js*
+battle_srv/room_*.txt
--- a/ConcerningEdgeCases.md
+++ b/ConcerningEdgeCases.md
@@ -1,15 +1,21 @@
-# Potential avalanche from local lag
+# What to be concerned for internet syncing
+1. Server received too late (solution: force confirmation)
+2. Client received too late (solution: prediction and frame chasing, big impact on user experience because the graphics will be inconsistent if mismatches occur too often)
+
+# Potential avalanche from `ACTIVE SLOW TICKER`
 Under the current "input delay" algorithm, the lag of a single player would cause all the other players to receive outdated commands, e.g. when at a certain moment   
- player#1: renderFrameId = 100, significantly lagged due to local CPU overheated
+- player#1: renderFrameId = 100, **still active in battle but significantly lagged** due to local CPU overheated
 - player#2: renderFrameId = 240
 - player#3: renderFrameId = 239
 - player#4: renderFrameId = 242

 players #2, #3 #4 would receive "outdated(in their subjective feelings) but all-confirmed commands" from then on, thus forced to rollback and chase many frames - the lag due to "large range of frame-chasing" would then further deteriorate the situation - like an avalanche.   

-In a "no-server & p2p" setup, I couldn't think of a proper way to cope with such edge case. Solely on the frontend we could only mitigate the impact to players #2, #3, #4, e.g. a potential lag due to "large range of frame-chasing" is proactively avoided in `<proj-root>/frontend/assets/scripts/Map.js, function update(dt)`.
+**BE CAUTIOUS, THIS `ACTIVE SLOW TICKER` SITUATION HAPPENS QUITE OFTEN FOR REAL DEVICES** where different operating systems and temporary CPU overheat cause different lags for different player in a same battle! If not properly handled, slow tickers would be `inputing in the "history" of other players`, resulting in too frequent prediction mismatch and thus inconsistent graphics for other players!

-However in a "server as authority" setup, the server could force confirming an inputFrame without player#1's upsync, and notify player#1 to apply a "roomDownsyncFrame" as well as drop all its outdated local inputFrames. 
+In a "no-server & p2p" setup, I couldn't think of a proper way to cope with such edge case. Solely on the frontend we could only mitigate the impact to players #2, #3, #4, e.g. a potential lag due to "large range of frame-chasing" is proactively avoided in `<proj-root>/frontend/assets/scripts/Map.js, function update(dt)`. 
+
+To be fair, **a "p2p" setup can reduce round-trip to single-trip**, but w/o a point of authority in such case player#1 needs a way to recognize the slowness (e.g. check the received peer inputs) and ticks faster for a while to catch up; in contrast in a "server as authority" setup, the server could force confirming an inputFrame without player#1's upsync, and notify player#1 to apply a "roomDownsyncFrame" as well as drop all its outdated local inputFrames. 

 # Start up frames
 renderFrameId      |   generatedInputFrameId    |  toApplyInputFrameId            
--- a/README.md
+++ b/README.md
@@ -2,11 +2,11 @@

 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 ~1.33x for file size reduction, kindly note that around ~8s countdown, the attack animation is resumed from a partial progress)_
+_(the following gif is sped up to ~1.5x for file size reduction, kindly note that animations are resumed from a partial progress)_

-![gif_demo](./charts/smooth_melee_attack_spedup.gif)
+![gif_demo](./charts/jump_sync_spedup.gif)

-Please also checkout [this demo video](https://pan.baidu.com/s/172AmIKxbFgGXZzWVqxNUPA?pwd=e2tp) 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.
+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.

 The video mainly shows the following features.
 - The backend receives inputs from frontend peers and broadcasts back for synchronization.
@@ -27,7 +27,7 @@ _(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)
- [Golang1.19.1](https://golang.org/dl/) (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/))
 - [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)
--- a/battle_srv/Makefile
+++ b/battle_srv/Makefile
@@ -1,6 +1,7 @@
 PROJECTNAME=server.exe
 ROOT_DIR=.
-GOPROXY=https://mirrors.aliyun.com/goproxy 
+#GOPROXY=https://mirrors.aliyun.com/goproxy 
+GOPROXY=https://goproxy.io
 all: help

 gen-constants:
--- a/battle_srv/check_daemon.sh
+++ b/battle_srv/check_daemon.sh
--- a/battle_srv/common/constants.json
+++ b/battle_srv/common/constants.json
@@ -1,28 +1,29 @@
 {
  "RET_CODE": {
-    "__comment__":"基础",
-    "OK": 9000,
-    "UNKNOWN_ERROR": 9001,
-    "INVALID_REQUEST_PARAM": 9002,
-    "IS_TEST_ACC": 9003,
-    "MYSQL_ERROR": 9004,
-    "NONEXISTENT_ACT": 9005,
-    "LACK_OF_DIAMOND": 9006,
-    "LACK_OF_GOLD": 9007,
-    "LACK_OF_ENERGY": 9008,
-    "NONEXISTENT_ACT_HANDLER": 9009,
-    "LOCALLY_NO_AVAILABLE_ROOM": 9010,
-    "LOCALLY_NO_SPECIFIED_ROOM": 9011,
-    "PLAYER_NOT_ADDABLE_TO_ROOM": 9012,
-    "PLAYER_NOT_READDABLE_TO_ROOM": 9013,
-    "PLAYER_NOT_FOUND": 9014,
-    "PLAYER_CHEATING": 9015,
-    "WECHAT_SERVER_ERROR": 9016,
-    "IS_BOT_ACC": 9017,
+    "__comment__": "Websocket",
+    "OK": 3000,
+    "UNKNOWN_ERROR": 3001,
+    "INVALID_REQUEST_PARAM": 3002,
+    "IS_TEST_ACC": 3003,
+    "MYSQL_ERROR": 3004,
+    "NONEXISTENT_ACT": 3005,
+    "LACK_OF_DIAMOND": 3006,
+    "LACK_OF_GOLD": 3007,
+    "LACK_OF_ENERGY": 3008,
+    "NONEXISTENT_ACT_HANDLER": 3009,
+    "LOCALLY_NO_AVAILABLE_ROOM": 3010,
+    "LOCALLY_NO_SPECIFIED_ROOM": 3011,
+    "PLAYER_NOT_ADDABLE_TO_ROOM": 3012,
+    "PLAYER_NOT_READDABLE_TO_ROOM": 3013,
+    "PLAYER_NOT_FOUND": 3014,
+    "PLAYER_CHEATING": 3015,
+    "WECHAT_SERVER_ERROR": 3016,
+    "IS_BOT_ACC": 3017,
+    "ACTIVE_WATCHDOG": 3018,
+    "BATTLE_STOPPED": 3019,
+    "CLIENT_MISMATCHED_RENDER_FRAME": 3020,

-    "__comment__":"SMS",
-    "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 5001,
-    "SMS_CAPTCHA_NOT_MATCH": 5002,
+    "__comment__": "OTHERS",
    "INVALID_TOKEN": 2001,

    "DUPLICATED": 2002,
@@ -39,12 +40,15 @@
    "FAILED_TO_DELETE": 2015,
    "FAILED_TO_CREATE": 2016,
    "INCORRECT_PHONE_NUMBER": 2018,
-    "INSUFFICIENT_MEM_TO_ALLOCATE_CONNECTION": 3001,
-    "PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY": 4000,
-    "TRADE_CREATION_TOO_FREQUENTLY": 4002,
-    "MAP_NOT_UNLOCKED": 4003,
+    "INSUFFICIENT_MEM_TO_ALLOCATE_CONNECTION": 2019,
+    "PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY": 2020,
+    "TRADE_CREATION_TOO_FREQUENTLY": 2021,
+    "MAP_NOT_UNLOCKED": 2022,
+
+    "GET_SMS_CAPTCHA_RESP_ERROR_CODE": 2023,
+    "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 2024,
+    "SMS_CAPTCHA_NOT_MATCH": 2025,

-    "GET_SMS_CAPTCHA_RESP_ERROR_CODE": 5003,
    "NOT_IMPLEMENTED_YET": 65535
  },
  "AUTH_CHANNEL": {
@@ -62,6 +66,6 @@
  },
  "WS": {
    "INTERVAL_TO_PING": 2000,
-    "WILL_KICK_IF_INACTIVE_FOR": 6000
+    "WILL_KICK_IF_INACTIVE_FOR": 4000
  }
 }
--- a/battle_srv/common/constants_struct.go
+++ b/battle_srv/common/constants_struct.go
@@ -15,10 +15,13 @@ type constants struct {
 		SmsValidResendPeriodSeconds int `json:"SMS_VALID_RESEND_PERIOD_SECONDS"`
 	} `json:"PLAYER"`
 	RetCode struct {
+		ActiveWatchdog                                   int    `json:"ACTIVE_WATCHDOG"`
+		BattleStopped                                    int    `json:"BATTLE_STOPPED"`
 		Duplicated                                       int    `json:"DUPLICATED"`
 		FailedToCreate                                   int    `json:"FAILED_TO_CREATE"`
 		FailedToDelete                                   int    `json:"FAILED_TO_DELETE"`
 		FailedToUpdate                                   int    `json:"FAILED_TO_UPDATE"`
+		GetSmsCaptchaRespErrorCode                       int    `json:"GET_SMS_CAPTCHA_RESP_ERROR_CODE"`
 		IncorrectCaptcha                                 int    `json:"INCORRECT_CAPTCHA"`
 		IncorrectHandle                                  int    `json:"INCORRECT_HANDLE"`
 		IncorrectPassword                                int    `json:"INCORRECT_PASSWORD"`
@@ -28,27 +31,26 @@ type constants struct {
 		InvalidEmailLiteral                              int    `json:"INVALID_EMAIL_LITERAL"`
 		InvalidRequestParam                              int    `json:"INVALID_REQUEST_PARAM"`
 		InvalidToken                                     int    `json:"INVALID_TOKEN"`
-		IsTestAcc                                        int    `json:"IS_TEST_ACC"`
 		IsBotAcc                                         int    `json:"IS_BOT_ACC"`
+		IsTestAcc                                        int    `json:"IS_TEST_ACC"`
 		LackOfDiamond                                    int    `json:"LACK_OF_DIAMOND"`
 		LackOfEnergy                                     int    `json:"LACK_OF_ENERGY"`
 		LackOfGold                                       int    `json:"LACK_OF_GOLD"`
+		LocallyNoAvailableRoom                           int    `json:"LOCALLY_NO_AVAILABLE_ROOM"`
+		LocallyNoSpecifiedRoom                           int    `json:"LOCALLY_NO_SPECIFIED_ROOM"`
 		MapNotUnlocked                                   int    `json:"MAP_NOT_UNLOCKED"`
 		MysqlError                                       int    `json:"MYSQL_ERROR"`
-		GetSmsCaptchaRespErrorCode                       int    `json:"GET_SMS_CAPTCHA_RESP_ERROR_CODE"`
 		NewHandleConflict                                int    `json:"NEW_HANDLE_CONFLICT"`
 		NonexistentAct                                   int    `json:"NONEXISTENT_ACT"`
 		NonexistentActHandler                            int    `json:"NONEXISTENT_ACT_HANDLER"`
-		LocallyNoAvailableRoom                           int    `json:"LOCALLY_NO_AVAILABLE_ROOM"`
-		LocallyNoSpecifiedRoom                           int    `json:"LOCALLY_NO_SPECIFIED_ROOM"`
-		PlayerNotAddableToRoom                           int    `json:"PLAYER_NOT_ADDABLE_TO_ROOM"`
-		PlayerNotReAddableToRoom                         int    `json:"PLAYER_NOT_READDABLE_TO_ROOM"`
-		PlayerNotFound                                   int    `json:"PLAYER_NOT_FOUND"`
-		PlayerCheating                                   int    `json:"PLAYER_CHEATING"`
 		NotImplementedYet                                int    `json:"NOT_IMPLEMENTED_YET"`
 		NoAssociatedEmail                                int    `json:"NO_ASSOCIATED_EMAIL"`
 		Ok                                               int    `json:"OK"`
 		PasswordResetCodeGenerationPerEmailTooFrequently int    `json:"PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY"`
+		PlayerCheating                                   int    `json:"PLAYER_CHEATING"`
+		PlayerNotAddableToRoom                           int    `json:"PLAYER_NOT_ADDABLE_TO_ROOM"`
+		PlayerNotFound                                   int    `json:"PLAYER_NOT_FOUND"`
+		PlayerNotReaddableToRoom                         int    `json:"PLAYER_NOT_READDABLE_TO_ROOM"`
 		SendEmailTimeout                                 int    `json:"SEND_EMAIL_TIMEOUT"`
 		SmsCaptchaNotMatch                               int    `json:"SMS_CAPTCHA_NOT_MATCH"`
 		SmsCaptchaRequestedTooFrequently                 int    `json:"SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY"`
--- a/battle_srv/go.mod
+++ b/battle_srv/go.mod
@@ -1,6 +1,6 @@
 module battle_srv

-go 1.19
+go 1.18

 require (
 	github.com/Masterminds/squirrel v0.0.0-20180815162352-8a7e65843414
@@ -16,12 +16,13 @@ require (
 	github.com/jmoiron/sqlx v0.0.0-20180614180643-0dae4fefe7c0
 	github.com/logrusorgru/aurora v0.0.0-20181002194514-a7b3b318ed4e
 	github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
-	github.com/solarlune/resolv v0.5.1
 	github.com/thoas/go-funk v0.0.0-20180716193722-1060394a7713
 	go.uber.org/zap v1.9.1
 	google.golang.org/protobuf v1.28.1

    dnmshared v0.0.0
+    jsexport v0.0.0
+    resolv v0.0.0
 )

 require (
@@ -48,4 +49,6 @@ require (

 replace (
 	dnmshared => ../dnmshared
+    jsexport => ../jsexport
+    resolv => ../resolv_tailored
 )
--- a/battle_srv/models/barrier.go
+++ b/battle_srv/models/barrier.go
@@ -1,9 +0,0 @@
-package models
-
-import (
-	. "dnmshared/sharedprotos"
-)
-
-type Barrier struct {
-	Boundary *Polygon2D
-}
--- a/battle_srv/models/pb_type_convert.go
+++ b/battle_srv/models/pb_type_convert.go
@@ -1,33 +1,140 @@
 package models

 import (
-	. "battle_srv/protos"
+	pb "battle_srv/protos"
+	"jsexport/battle"
 )

-func toPbPlayers(modelInstances map[int32]*Player, withMetaInfo bool) map[int32]*PlayerDownsync {
-	toRet := make(map[int32]*PlayerDownsync, 0)
+func toPbRoomDownsyncFrame(rdf *battle.RoomDownsyncFrame) *pb.RoomDownsyncFrame {
+	if nil == rdf {
+		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),
+	}
+
+	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,
+		}
+		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,
+
+			SelfMoveforwardX: last.SelfMoveforwardX,
+			SelfMoveforwardY: last.SelfMoveforwardY,
+			HitboxSizeX:      last.HitboxSizeX,
+			HitboxSizeY:      last.HitboxSizeY,
+
+			OffenderJoinIndex: last.OffenderJoinIndex,
+			OffenderPlayerId:  last.OffenderPlayerId,
+		}
+		ret.MeleeBullets[i] = pbBullet
+	}
+
+	for i, last := range rdf.PlayerOpPatternToSkillId {
+		ret.PlayerOpPatternToSkillId[int32(i)] = int32(last)
+	}
+
+	return ret
+}
+
+func toPbPlayers(modelInstances map[int32]*Player, withMetaInfo bool) []*pb.PlayerDownsync {
+	toRet := make([]*pb.PlayerDownsync, len(modelInstances), len(modelInstances))
 	if nil == modelInstances {
 		return toRet
 	}

-	for k, last := range modelInstances {
-		toRet[k] = &PlayerDownsync{
+	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,
+		}
+		if withMetaInfo {
+			pbPlayer.Name = last.Name
+			pbPlayer.DisplayName = last.DisplayName
+			pbPlayer.Avatar = last.Avatar
+		}
+		toRet[last.JoinIndex-1] = pbPlayer
+	}
+
+	return toRet
+}
+
+func toJsPlayers(modelInstances map[int32]*Player) []*battle.PlayerDownsync {
+	toRet := make([]*battle.PlayerDownsync, len(modelInstances), len(modelInstances))
+	if nil == modelInstances {
+		return toRet
+	}
+
+	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,
-			ColliderRadius: last.ColliderRadius,
+			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,
-			JoinIndex:      last.JoinIndex,
-		}
-		if withMetaInfo {
-			toRet[k].Name = last.Name
-			toRet[k].DisplayName = last.DisplayName
-			toRet[k].Avatar = last.Avatar
 		}
 	}

--- a/battle_srv/models/room.go
+++ b/battle_srv/models/room.go
--- a/battle_srv/models/watchdog.go
+++ b/battle_srv/models/watchdog.go
@@ -0,0 +1,27 @@
+package models
+
+import (
+	"time"
+)
+
+type Watchdog struct {
+	interval time.Duration
+	timer    *time.Timer
+}
+
+func NewWatchdog(interval time.Duration, callback func()) *Watchdog {
+	w := Watchdog{
+		interval: interval,
+		timer:    time.AfterFunc(interval, callback),
+	}
+	return &w
+}
+
+func (w *Watchdog) Stop() {
+	w.timer.Stop()
+}
+
+func (w *Watchdog) Kick() {
+	w.timer.Stop()
+	w.timer.Reset(w.interval)
+}
--- a/battle_srv/protos/room_downsync_frame.pb.go
+++ b/battle_srv/protos/room_downsync_frame.pb.go
--- a/battle_srv/start_daemon.sh
+++ b/battle_srv/start_daemon.sh
@@ -7,6 +7,7 @@ fi

 basedir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

+PROJECTNAME=server.exe
 OS_USER=$USER
 ServerEnv=$1
 LOG_PATH="/var/log/treasure-hunter.log"
@@ -17,5 +18,5 @@ PID_FILE="$basedir/treasure-hunter.pid"
 sudo su - root -c "touch $LOG_PATH" 
 sudo su - root -c "chown $OS_USER:$OS_USER $LOG_PATH" 

-ServerEnv=$ServerEnv $basedir/server >$LOG_PATH 2>&1 &
+ServerEnv=$ServerEnv $basedir/$PROJECTNAME >$LOG_PATH 2>&1 &
 echo $! > $PID_FILE
--- a/battle_srv/stop_daemon.sh
+++ b/battle_srv/stop_daemon.sh
--- a/battle_srv/ws/serve.go
+++ b/battle_srv/ws/serve.go
@@ -240,14 +240,12 @@ func Serve(c *gin.Context) {

 		// Construct "battleColliderInfo" to downsync
 		bciFrame := &pb.BattleColliderInfo{
-			BoundRoomId:           pRoom.Id,
-			StageName:             pRoom.StageName,
-			StrToVec2DListMap:     pRoom.StrToVec2DListMap,
-			StrToPolygon2DListMap: pRoom.StrToPolygon2DListMap,
-			StageDiscreteW:        pRoom.StageDiscreteW,
-			StageDiscreteH:        pRoom.StageDiscreteH,
-			StageTileW:            pRoom.StageTileW,
-			StageTileH:            pRoom.StageTileH,
+			BoundRoomId:    pRoom.Id,
+			StageName:      pRoom.StageName,
+			StageDiscreteW: pRoom.StageDiscreteW,
+			StageDiscreteH: pRoom.StageDiscreteH,
+			StageTileW:     pRoom.StageTileW,
+			StageTileH:     pRoom.StageTileH,

 			IntervalToPing:                  int32(Constants.Ws.IntervalToPing),
 			WillKickIfInactiveFor:           int32(Constants.Ws.WillKickIfInactiveFor),
@@ -265,9 +263,16 @@ func Serve(c *gin.Context) {
 			WorldToVirtualGridRatio: pRoom.WorldToVirtualGridRatio,
 			VirtualGridToWorldRatio: pRoom.VirtualGridToWorldRatio,

-			SpAtkLookupFrames: pRoom.SpAtkLookupFrames,
-			RenderCacheSize:   pRoom.RenderCacheSize,
-			MeleeSkillConfig:  pRoom.MeleeSkillConfig,
+			SpAtkLookupFrames:         pRoom.SpAtkLookupFrames,
+			RenderCacheSize:           pRoom.RenderCacheSize,
+			SnapIntoPlatformOverlap:   pRoom.SnapIntoPlatformOverlap,
+			SnapIntoPlatformThreshold: pRoom.SnapIntoPlatformThreshold,
+			JumpingInitVelY:           pRoom.JumpingInitVelY,
+			GravityX:                  pRoom.GravityX,
+			GravityY:                  pRoom.GravityY,
+			CollisionMinStep:          pRoom.CollisionMinStep,
+
+			FrameDataLoggingEnabled: pRoom.FrameDataLoggingEnabled,
 		}

 		resp := &pb.WsResp{
@@ -368,7 +373,7 @@ func Serve(c *gin.Context) {
 			// TODO: Is there any potential edge-trigger improvement like the epoll approach mentioned above for the following statement? See discussion in https://github.com/gorilla/websocket/issues/122
 			_, bytes, err := conn.ReadMessage()
 			if nil != err {
-				Logger.Error("About to `signalToCloseConnOfThisPlayer`", zap.Any("roomId", pRoom.Id), zap.Any("playerId", playerId), zap.Error(err))
+				Logger.Error("About to `signalToCloseConnOfThisPlayer` due to conn.ReadMessage err", zap.Any("roomId", pRoom.Id), zap.Any("playerId", playerId), zap.Error(err))
 				signalToCloseConnOfThisPlayer(Constants.RetCode.UnknownError, "")
 				return nil
 			}
--- a/charts/README.md
+++ b/charts/README.md
@@ -7,3 +7,10 @@ ffmpeg -i input.mp4 -filter:v "setpts=0.5*PTS" output.mp4
 ```
 ffmpeg -ss 12 -t 13 -i input.mp4 -vf "fps=10,scale=480:-1" -loop 0 output.gif
 ```
+
+# Extract GIF (with alpha channel, e.g. exported from Fighter Factory Studio) to PNG sequence
+```
+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.
--- a/charts/jump_sync_spedup.gif
+++ b/charts/jump_sync_spedup.gif
--- a/charts/smooth_melee_attack_spedup.gif
+++ b/charts/smooth_melee_attack_spedup.gif
--- a/collider_visualizer/Makefile
+++ b/collider_visualizer/Makefile
@@ -2,7 +2,8 @@ PROJECTNAME=viscol.exe
 ROOT_DIR=.
 all: help
 ## Available proxies for downloading go modules are listed in "https://github.com/golang/go/wiki/Modules#how-do-i-use-vendoring-with-modules-is-vendoring-going-away". 
-GOPROXY=https://mirrors.aliyun.com/goproxy 
+#GOPROXY=https://mirrors.aliyun.com/goproxy 
+GOPROXY=https://goproxy.io

 build:
 	GOPROXY=$(GOPROXY) go build -o $(ROOT_DIR)/$(PROJECTNAME)
--- a/collider_visualizer/common.go
+++ b/collider_visualizer/common.go
@@ -2,8 +2,8 @@ package main

 import (
 	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/solarlune/resolv"
 	"image/color"
+	"resolv"
 )

 var (
--- a/collider_visualizer/go.mod
+++ b/collider_visualizer/go.mod
@@ -1,30 +1,44 @@
 module viscol

-go 1.19
+go 1.18

 require (
+    jsexport v0.0.0
 	dnmshared v0.0.0
-	battle_srv v0.0.0
+    resolv v0.0.0
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
 	github.com/hajimehoshi/ebiten/v2 v2.4.7
-	github.com/solarlune/resolv v0.5.1
 	golang.org/x/image v0.0.0-20220902085622-e7cb96979f69
 )

 require (
 	github.com/ebitengine/purego v0.0.0-20220905075623-aeed57cda744 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20220806181222-55e207c401ad // indirect
 	github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jezek/xgb v1.0.1 // indirect
-	github.com/kvartborg/vector v0.0.0-20200419093813-2cba0cabb4f0 // indirect
+	github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86 // indirect
+	github.com/neelance/sourcemap v0.0.0-20200213170602-2833bce08e4c // indirect
+	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749 // indirect
+	github.com/sirupsen/logrus v1.8.1 // indirect
+	github.com/spf13/cobra v1.2.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.23.0 // indirect
-	golang.org/x/exp v0.0.0-20190731235908-ec7cb31e5a56 // indirect
+	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
+	golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 // indirect
 	golang.org/x/mobile v0.0.0-20220722155234-aaac322e2105 // indirect
+	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect
 	golang.org/x/sys v0.0.0-20220818161305-2296e01440c6 // indirect
+	golang.org/x/term v0.0.0-20220411215600-e5f449aeb171 // indirect
+	golang.org/x/tools v0.1.12 // indirect
 	google.golang.org/protobuf v1.28.1 // indirect
 )

-replace dnmshared => ../dnmshared
-replace battle_srv => ../battle_srv
+replace (
+    dnmshared => ../dnmshared
+    jsexport => ../jsexport
+    resolv => ../resolv_tailored
+)
--- a/collider_visualizer/go.sum
+++ b/collider_visualizer/go.sum
@@ -1,14 +1,153 @@
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+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
--- a/collider_visualizer/main.go
+++ b/collider_visualizer/main.go
@@ -11,13 +11,13 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 	"github.com/hajimehoshi/ebiten/v2/text"
-	"github.com/solarlune/resolv"
 	"golang.org/x/image/font"

 	"encoding/xml"
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"resolv"

 	. "dnmshared"
 )
--- a/collider_visualizer/worldColliderDisplay.go
+++ b/collider_visualizer/worldColliderDisplay.go
@@ -1,14 +1,13 @@
 package main

 import (
-	. "battle_srv/protos"
 	. "dnmshared"
-	. "dnmshared/sharedprotos"
 	"fmt"
 	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/solarlune/resolv"
 	"go.uber.org/zap"
 	"image/color"
+	. "jsexport/battle"
+	"resolv"
 )

 type WorldColliderDisplay struct {
@@ -34,54 +33,60 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 	spaceOffsetX := float64(spaceW) * 0.5
 	spaceOffsetY := float64(spaceH) * 0.5

-	virtualGridToWorldRatio := 0.1
-	playerDefaultSpeed := 20
-	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 2)
-	playerColliderRadius := float64(24)
-	playerColliders := make([]*resolv.Object, len(playerPosList.Eles))
+	worldToVirtualGridRatio := float64(1000)
+	virtualGridToWorldRatio := float64(1) / worldToVirtualGridRatio
+	playerDefaultSpeed := 1 * worldToVirtualGridRatio
+	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 3)
+	playerColliderRadius := float64(12)
+	playerColliders := make([]*resolv.Object, len(playerPosList))
+	snapIntoPlatformOverlap := float64(0.1)
 	space := resolv.NewSpace(int(spaceW), int(spaceH), minStep, minStep)
-	for i, playerPos := range playerPosList.Eles {
-		playerCollider := GenerateRectCollider(playerPos.X, playerPos.Y, playerColliderRadius*2, playerColliderRadius*2, spaceOffsetX, spaceOffsetY, "Player") // [WARNING] Deliberately not using a circle because "resolv v0.5.1" doesn't yet align circle center with space cell center, regardless of the "specified within-object offset"
-		Logger.Info(fmt.Sprintf("Player Collider#%d: player world pos =(%.2f, %.2f), shape=%v", i, playerPos.X, playerPos.Y, ConvexPolygonStr(playerCollider.Shape.(*resolv.ConvexPolygon))))
+	topPadding, bottomPadding, leftPadding, rightPadding := snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap
+	for i, playerPos := range playerPosList {
+		colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
+		playerCollider := GenerateRectCollider(playerPos.X, playerPos.Y, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, nil, fmt.Sprintf("Player%d", i+1)) // [WARNING] Deliberately not using a circle because "resolv v0.5.1" doesn't yet align circle center with space cell center, regardless of the "specified within-object offset"
+		Logger.Info(fmt.Sprintf("Player Collider#%d: player world pos=(%.2f, %.2f), shape=%v", i, playerPos.X, playerPos.Y, ConvexPolygonStr(playerCollider.Shape.(*resolv.ConvexPolygon))))
 		playerColliders[i] = playerCollider
 		space.Add(playerCollider)
 	}

 	barrierLocalId := 0
-	for _, barrierUnaligned := range barrierList.Eles {
-		barrierCollider := GenerateConvexPolygonCollider(barrierUnaligned, spaceOffsetX, spaceOffsetY, "Barrier")
-		Logger.Info(fmt.Sprintf("Added barrier: shape=%v", ConvexPolygonStr(barrierCollider.Shape.(*resolv.ConvexPolygon))))
+	for _, barrierUnaligned := range barrierList {
+		barrierCollider := GenerateConvexPolygonCollider(barrierUnaligned, spaceOffsetX, spaceOffsetY, nil, "Barrier")
+		Logger.Debug(fmt.Sprintf("Added barrier: shape=%v", ConvexPolygonStr(barrierCollider.Shape.(*resolv.ConvexPolygon))))
 		space.Add(barrierCollider)
 		barrierLocalId++
 	}

 	world.Space = space

-	moveToCollide := false
+	moveToCollide := true
 	if moveToCollide {
-		newVx, newVy := int32(-2959), int32(-2261)
 		effPushback := Vec2D{X: float64(0), Y: float64(0)}
-		toTestPlayerCollider := playerColliders[0]
-		toTestPlayerCollider.X, toTestPlayerCollider.Y = VirtualGridToPolygonColliderAnchorPos(newVx, newVy, playerColliderRadius, playerColliderRadius, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)
+		colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
+		playerColliders[0].X, playerColliders[0].Y = VirtualGridToPolygonColliderBLPos(int32(-139000), int32(-474500), colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)
+		playerColliders[0].Update()

-		Logger.Info(fmt.Sprintf("Checking collision for virtual (%d, %d), now playerShape=%v", newVx, newVy, ConvexPolygonStr(toTestPlayerCollider.Shape.(*resolv.ConvexPolygon))))
+		playerColliders[1].X, playerColliders[1].Y = VirtualGridToPolygonColliderBLPos(int32(-163000), int32(-520000), colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)
+		playerColliders[1].Update()

-		toTestPlayerCollider.Update()
+		toTestPlayerCollider := playerColliders[1]
 		if collision := toTestPlayerCollider.Check(0, 0); collision != nil {
 			playerShape := toTestPlayerCollider.Shape.(*resolv.ConvexPolygon)
 			for _, obj := range collision.Objects {
-				barrierShape := obj.Shape.(*resolv.ConvexPolygon)
-				if overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, barrierShape); overlapped {
-					Logger.Warn(fmt.Sprintf("Overlapped: a=%v, b=%v, pushbackX=%v, pushbackY=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(barrierShape), pushbackX, pushbackY))
+				bShape := obj.Shape.(*resolv.ConvexPolygon)
+				Logger.Warn(fmt.Sprintf("Checking potential: a=%v, b=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(bShape)))
+				if overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, bShape); overlapped {
+					Logger.Warn(fmt.Sprintf("Overlapped: a=%v, b=%v, pushbackX=%v, pushbackY=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(bShape), pushbackX, pushbackY))
 					effPushback.X += pushbackX
 					effPushback.Y += pushbackY
 				} else {
-					Logger.Warn(fmt.Sprintf("Collided BUT not overlapped: a=%v, b=%v, overlapResult=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(barrierShape), overlapResult))
+					Logger.Warn(fmt.Sprintf("Collided BUT not overlapped: a=%v, b=%v, overlapResult=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(bShape), overlapResult))
 				}
 			}
-			toTestPlayerCollider.X -= effPushback.X
-			toTestPlayerCollider.Y -= effPushback.Y
-			toTestPlayerCollider.Update()
+			//toTestPlayerCollider.X -= effPushback.X
+			//toTestPlayerCollider.Y -= effPushback.Y
+			//toTestPlayerCollider.Update()
 			Logger.Info(fmt.Sprintf("effPushback={%v, %v}", effPushback.X, effPushback.Y))
 		}
 	}
@@ -92,15 +97,11 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 		RecoveryFrames:        int32(61),
 		RecoveryFramesOnBlock: int32(61),
 		RecoveryFramesOnHit:   int32(61),
-		Moveforward: &Vec2D{
-			X: 0,
-			Y: 0,
-		},
-		HitboxOffset: float64(24.0),
-		HitboxSize: &Vec2D{
-			X: float64(45.0),
-			Y: float64(32.0),
-		},
+		SelfMoveforwardX:      0,
+		SelfMoveforwardY:      0,
+		HitboxOffset:          float64(24.0),
+		HitboxSizeX:           float64(45.0),
+		HitboxSizeY:           float64(32.0),

 		// for defender
 		HitStunFrames:      int32(18),
@@ -109,13 +110,12 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 		ReleaseTriggerType: int32(1), // 1: rising-edge, 2: falling-edge
 		Damage:             int32(5),
 	}
-	bulletLeftToRight := true
+	bulletLeftToRight := false
 	if bulletLeftToRight {
 		xfac := float64(1.0)
-		offenderWx, offenderWy := playerPosList.Eles[0].X, playerPosList.Eles[0].Y
+		offenderWx, offenderWy := playerPosList[0].X, playerPosList[0].Y
 		bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
-
-		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, spaceOffsetX, spaceOffsetY, "MeleeBullet")
+		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSizeX, meleeBullet.HitboxSizeY, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, nil, "MeleeBullet")
 		space.Add(newBulletCollider)
 		bulletShape := newBulletCollider.Shape.(*resolv.ConvexPolygon)
 		Logger.Warn(fmt.Sprintf("bullet ->: Added bullet collider to space: a=%v", ConvexPolygonStr(bulletShape)))
@@ -132,13 +132,13 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 		}
 	}

-	bulletRightToLeft := true
+	bulletRightToLeft := false
 	if bulletRightToLeft {
 		xfac := float64(-1.0)
-		offenderWx, offenderWy := playerPosList.Eles[1].X, playerPosList.Eles[1].Y
+		offenderWx, offenderWy := playerPosList[1].X, playerPosList[1].Y
 		bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy

-		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, spaceOffsetX, spaceOffsetY, "MeleeBullet")
+		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSizeX, meleeBullet.HitboxSizeY, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, nil, "MeleeBullet")
 		space.Add(newBulletCollider)
 		bulletShape := newBulletCollider.Shape.(*resolv.ConvexPolygon)
 		Logger.Warn(fmt.Sprintf("bullet <-: Added bullet collider to space: a=%v", ConvexPolygonStr(bulletShape)))
@@ -165,11 +165,14 @@ func (world *WorldColliderDisplay) Update() {
 func (world *WorldColliderDisplay) Draw(screen *ebiten.Image) {

 	for _, o := range world.Space.Objects() {
-		if o.HasTags("Player") {
-			drawColor := color.RGBA{0, 255, 0, 255}
+		if o.HasTags("Player1") {
+			drawColor := color.RGBA{255, 0, 0, 255}
+			DrawPolygon(screen, o.Shape.(*resolv.ConvexPolygon), drawColor)
+		} else if o.HasTags("Player2") {
+			drawColor := color.RGBA{0, 0, 255, 255}
 			DrawPolygon(screen, o.Shape.(*resolv.ConvexPolygon), drawColor)
 		} else if o.HasTags("MeleeBullet") {
-			drawColor := color.RGBA{0, 0, 255, 255}
+			drawColor := color.RGBA{78, 255, 112, 255}
 			DrawPolygon(screen, o.Shape.(*resolv.ConvexPolygon), drawColor)
 		} else {
 			drawColor := color.RGBA{60, 60, 60, 255}
@@ -177,7 +180,7 @@ func (world *WorldColliderDisplay) Draw(screen *ebiten.Image) {
 		}
 	}

-	world.Game.DebugDraw(screen, world.Space)
+	//world.Game.DebugDraw(screen, world.Space)

 	if world.Game.ShowHelpText {

--- a/dnmshared/geometry.go
+++ b/dnmshared/geometry.go
@@ -1,50 +0,0 @@
-package dnmshared
-
-import (
-	. "dnmshared/sharedprotos"
-	"math"
-)
-
-func NormVec2D(dx, dy float64) Vec2D {
-	return Vec2D{X: dy, Y: -dx}
-}
-
-func AlignPolygon2DToBoundingBox(input *Polygon2D) *Polygon2D {
-	// Transform again to put "anchor" at the top-left point of the bounding box for "resolv"
-	boundingBoxTL := &Vec2D{
-		X: math.MaxFloat64,
-		Y: math.MaxFloat64,
-	}
-	for _, p := range input.Points {
-		if p.X < boundingBoxTL.X {
-			boundingBoxTL.X = p.X
-		}
-		if p.Y < boundingBoxTL.Y {
-			boundingBoxTL.Y = p.Y
-		}
-	}
-
-	// Now "input.Anchor" should move to "input.Anchor+boundingBoxTL", thus "boundingBoxTL" is also the value of the negative diff for all "input.Points"
-	output := &Polygon2D{
-		Anchor: &Vec2D{
-			X: input.Anchor.X + boundingBoxTL.X,
-			Y: input.Anchor.Y + boundingBoxTL.Y,
-		},
-		Points: make([]*Vec2D, len(input.Points)),
-	}
-
-	for i, p := range input.Points {
-		output.Points[i] = &Vec2D{
-			X: p.X - boundingBoxTL.X,
-			Y: p.Y - boundingBoxTL.Y,
-		}
-	}
-
-	return output
-}
-
-func Distance(pt1 *Vec2D, pt2 *Vec2D) float64 {
-	dx := pt1.X - pt2.X
-	dy := pt1.Y - pt2.Y
-	return math.Sqrt(dx*dx + dy*dy)
-}
--- a/dnmshared/go.mod
+++ b/dnmshared/go.mod
@@ -1,3 +1,11 @@
 module dnmshared 

-go 1.19
+go 1.18
+
+require (
+	resolv v0.0.0
+)
+
+replace (
+	resolv => ../resolv_tailored
+)
--- a/dnmshared/resolv_helper.go
+++ b/dnmshared/resolv_helper.go
@@ -1,14 +1,16 @@
 package dnmshared

 import (
-	. "dnmshared/sharedprotos"
 	"fmt"
-	"github.com/kvartborg/vector"
-	"github.com/solarlune/resolv"
-	"math"
+	. "jsexport/battle"
+	"resolv"
 	"strings"
 )

+func NormVec2D(dx, dy float64) Vec2D {
+	return Vec2D{X: dy, Y: -dx}
+}
+
 func ConvexPolygonStr(body *resolv.ConvexPolygon) string {
 	var s []string = make([]string, len(body.Points))
 	for i, p := range body.Points {
@@ -18,242 +20,6 @@ func ConvexPolygonStr(body *resolv.ConvexPolygon) string {
 	return fmt.Sprintf("{\n%s\n}", strings.Join(s, ",\n"))
 }

-func GenerateRectCollider(origX, origY, w, h, spaceOffsetX, spaceOffsetY float64, tag string) *resolv.Object {
-	cx, cy := WorldToPolygonColliderAnchorPos(origX, origY, w*0.5, h*0.5, spaceOffsetX, spaceOffsetY)
-    return GenerateRectColliderInCollisionSpace(cx, cy, w, h, tag) 
-}
-
-func GenerateRectColliderInCollisionSpace(cx, cy, w, h float64, tag string) *resolv.Object {
-	collider := resolv.NewObject(cx, cy, w, h, tag)
-	shape := resolv.NewRectangle(0, 0, w, h)
-	collider.SetShape(shape)
-	return collider
-}
-
-func GenerateConvexPolygonCollider(unalignedSrc *Polygon2D, spaceOffsetX, spaceOffsetY float64, tag string) *resolv.Object {
-	aligned := AlignPolygon2DToBoundingBox(unalignedSrc)
-	var w, h float64 = 0, 0
-
-	shape := resolv.NewConvexPolygon()
-	for i, pi := range aligned.Points {
-		for j, pj := range aligned.Points {
-			if i == j {
-				continue
-			}
-			if math.Abs(pj.X-pi.X) > w {
-				w = math.Abs(pj.X - pi.X)
-			}
-			if math.Abs(pj.Y-pi.Y) > h {
-				h = math.Abs(pj.Y - pi.Y)
-			}
-		}
-	}
-
-	for i := 0; i < len(aligned.Points); i++ {
-		p := aligned.Points[i]
-		shape.AddPoints(p.X, p.Y)
-	}
-
-	collider := resolv.NewObject(aligned.Anchor.X+spaceOffsetX, aligned.Anchor.Y+spaceOffsetY, w, h, tag)
-	collider.SetShape(shape)
-
-	return collider
-}
-
-func CalcPushbacks(oldDx, oldDy float64, playerShape, barrierShape *resolv.ConvexPolygon) (bool, float64, float64, *SatResult) {
-	origX, origY := playerShape.Position()
-	defer func() {
-		playerShape.SetPosition(origX, origY)
-	}()
-	playerShape.SetPosition(origX+oldDx, origY+oldDy)
-	overlapResult := &SatResult{
-		Overlap:       0,
-		OverlapX:      0,
-		OverlapY:      0,
-		AContainedInB: true,
-		BContainedInA: true,
-		Axis:          vector.Vector{0, 0},
-	}
-	if overlapped := IsPolygonPairOverlapped(playerShape, barrierShape, overlapResult); overlapped {
-		pushbackX, pushbackY := overlapResult.Overlap*overlapResult.OverlapX, overlapResult.Overlap*overlapResult.OverlapY
-		return true, pushbackX, pushbackY, overlapResult
-	} else {
-		return false, 0, 0, overlapResult
-	}
-}
-
-type SatResult struct {
-	Overlap       float64
-	OverlapX      float64
-	OverlapY      float64
-	AContainedInB bool
-	BContainedInA bool
-	Axis          vector.Vector
-}
-
-func IsPolygonPairOverlapped(a, b *resolv.ConvexPolygon, result *SatResult) bool {
-	aCnt, bCnt := len(a.Points), len(b.Points)
-	// Single point case
-	if 1 == aCnt && 1 == bCnt {
-		if nil != result {
-			result.Overlap = 0
-		}
-		return a.Points[0].X() == b.Points[0].X() && a.Points[0].Y() == b.Points[0].Y()
-	}
-
-	if 1 < aCnt {
-		for _, axis := range a.SATAxes() {
-			if isPolygonPairSeparatedByDir(a, b, axis.Unit(), result) {
-				return false
-			}
-		}
-	}
-
-	if 1 < bCnt {
-		for _, axis := range b.SATAxes() {
-			if isPolygonPairSeparatedByDir(a, b, axis.Unit(), result) {
-				return false
-			}
-		}
-	}
-
-	return true
-}
-
-func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e vector.Vector, result *SatResult) bool {
-	/*
-		[WARNING] This function is deliberately made private, it shouldn't be used alone (i.e. not along the norms of a polygon), otherwise the pushbacks calculated would be meaningless.
-
-		Consider the following example
-		a: {
-			anchor: [1337.19 1696.74]
-			points: [[0 0] [24 0] [24 24] [0 24]]
-		},
-		b: {
-			anchor: [1277.72 1570.56]
-			points: [[642.57 319.16] [0 319.16] [5.73 0] [643.75 0.90]]
-		}
-
-		e = (-2.98, 1.49).Unit()
-	*/
-
-	var aStart, aEnd, bStart, bEnd float64 = math.MaxFloat64, -math.MaxFloat64, math.MaxFloat64, -math.MaxFloat64
-	for _, p := range a.Points {
-		dot := (p.X()+a.X)*e.X() + (p.Y()+a.Y)*e.Y()
-
-		if aStart > dot {
-			aStart = dot
-		}
-
-		if aEnd < dot {
-			aEnd = dot
-		}
-	}
-
-	for _, p := range b.Points {
-		dot := (p.X()+b.X)*e.X() + (p.Y()+b.Y)*e.Y()
-
-		if bStart > dot {
-			bStart = dot
-		}
-
-		if bEnd < dot {
-			bEnd = dot
-		}
-	}
-
-	if aStart > bEnd || aEnd < bStart {
-		// Separated by unit vector "e"
-		return true
-	}
-
-	if nil != result {
-		result.Axis = e
-		overlap := float64(0)
-
-		if aStart < bStart {
-			result.AContainedInB = false
-
-			if aEnd < bEnd {
-				overlap = aEnd - bStart
-				result.BContainedInA = false
-			} else {
-				option1 := aEnd - bStart
-				option2 := bEnd - aStart
-				if option1 < option2 {
-					overlap = option1
-				} else {
-					overlap = -option2
-				}
-			}
-		} else {
-			result.BContainedInA = false
-
-			if aEnd > bEnd {
-				overlap = aStart - bEnd
-				result.AContainedInB = false
-			} else {
-				option1 := aEnd - bStart
-				option2 := bEnd - aStart
-				if option1 < option2 {
-					overlap = option1
-				} else {
-					overlap = -option2
-				}
-			}
-		}
-
-		currentOverlap := result.Overlap
-		absoluteOverlap := overlap
-		if overlap < 0 {
-			absoluteOverlap = -overlap
-		}
-
-		if 0 == currentOverlap || currentOverlap > absoluteOverlap {
-			var sign float64 = 1
-			if overlap < 0 {
-				sign = -1
-			}
-
-			result.Overlap = absoluteOverlap
-			result.OverlapX = e.X() * sign
-			result.OverlapY = e.Y() * sign
-		}
-	}
-
-	// the specified unit vector "e" doesn't separate "a" and "b", overlap result is generated
-	return false
-}
-
-func WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio float64) (int32, int32) {
-	// [WARNING] Introduces loss of precision!
-	// In JavaScript floating numbers suffer from seemingly non-deterministic arithmetics, and even if certain libs solved this issue by approaches such as fixed-point-number, they might not be used in other libs -- e.g. the "collision libs" we're interested in -- thus couldn't kill all pains.
-	var virtualGridX int32 = int32(math.Round(wx * worldToVirtualGridRatio))
-	var virtualGridY int32 = int32(math.Round(wy * worldToVirtualGridRatio))
-	return virtualGridX, virtualGridY
-}
-
-func VirtualGridToWorldPos(vx, vy int32, virtualGridToWorldRatio float64) (float64, float64) {
-	// No loss of precision
-	var wx float64 = float64(vx) * virtualGridToWorldRatio
-	var wy float64 = float64(vy) * virtualGridToWorldRatio
-	return wx, wy
-}
-
-func WorldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return wx - halfBoundingW + collisionSpaceOffsetX, wy - halfBoundingH + collisionSpaceOffsetY
-}
-
-func PolygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return cx + halfBoundingW - collisionSpaceOffsetX, cy + halfBoundingH - collisionSpaceOffsetY
-}
-
-func PolygonColliderAnchorToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
-	wx, wy := PolygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
-	return WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio)
-}
-
-func VirtualGridToPolygonColliderAnchorPos(vx, vy int32, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
-	wx, wy := VirtualGridToWorldPos(vx, vy, virtualGridToWorldRatio)
-	return WorldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
+func RectCenterStr(body *resolv.Object, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64) string {
+	return fmt.Sprintf("{%.2f, %.2f}", body.X+leftPadding+halfBoundingW-spaceOffsetX, body.Y+bottomPadding+halfBoundingH-spaceOffsetY)
 }
--- a/dnmshared/tmx_parser.go
+++ b/dnmshared/tmx_parser.go
@@ -3,12 +3,13 @@ package dnmshared
 import (
 	"bytes"
 	"compress/zlib"
-	. "dnmshared/sharedprotos"
 	"encoding/base64"
 	"encoding/xml"
 	"errors"
+	"fmt"
 	"go.uber.org/zap"
 	"io/ioutil"
+	. "jsexport/battle"
 	"math"
 	"strconv"
 	"strings"
@@ -43,13 +44,13 @@ type TmxOrTsxPolyline struct {

 type TmxOrTsxObject struct {
 	Id         int                 `xml:"id,attr"`
-	Gid        *int                `xml:"gid,attr"`
+	Gid        int                 `xml:"gid,attr"`
 	X          float64             `xml:"x,attr"`
 	Y          float64             `xml:"y,attr"`
 	Properties *TmxOrTsxProperties `xml:"properties"`
 	Polyline   *TmxOrTsxPolyline   `xml:"polyline"`
-	Width      *float64            `xml:"width,attr"`
-	Height     *float64            `xml:"height,attr"`
+	Width      float64             `xml:"width,attr"`
+	Height     float64             `xml:"height,attr"`
 }

 type TmxOrTsxObjectGroup struct {
@@ -174,8 +175,8 @@ func (l *TmxLayer) decodeBase64() ([]uint32, error) {
 	return gids, nil
 }

-type StrToVec2DListMap map[string]*Vec2DList
-type StrToPolygon2DListMap map[string]*Polygon2DList
+type StrToVec2DListMap map[string](*[]*Vec2D)
+type StrToPolygon2DListMap map[string](*[]*Polygon2D)

 func tmxPolylineToPolygon2D(pTmxMapIns *TmxMap, singleObjInTmxFile *TmxOrTsxObject, targetPolyline *TmxOrTsxPolyline) (*Polygon2D, error) {
 	if nil == targetPolyline {
@@ -320,21 +321,18 @@ func DeserializeTsxToColliderDict(pTmxMapIns *TmxMap, byteArrOfTsxFile []byte, f
 				theStrToPolygon2DListMap = gidBoundariesMap[globalGid]
 			}

-			var pThePolygon2DList *Polygon2DList
-			if _, ok := theStrToPolygon2DListMap[key]; ok {
-				pThePolygon2DList = theStrToPolygon2DListMap[key]
-			} else {
-				pThePolygon2DList = &Polygon2DList{
-					Eles: make([]*Polygon2D, 0),
-				}
-				theStrToPolygon2DListMap[key] = pThePolygon2DList
+			var pThePolygon2DList *[]*Polygon2D = nil
+			if _, ok := theStrToPolygon2DListMap[key]; !ok {
+				tmp := make([]*Polygon2D, 0)
+				theStrToPolygon2DListMap[key] = &tmp
 			}
+			pThePolygon2DList = theStrToPolygon2DListMap[key]

 			thePolygon2DFromPolyline, err := tsxPolylineToOffsetsWrtTileCenter(pTmxMapIns, singleObj, singleObj.Polyline, pTsxIns)
 			if nil != err {
 				panic(err)
 			}
-			pThePolygon2DList.Eles = append(pThePolygon2DList.Eles, thePolygon2DFromPolyline)
+			*pThePolygon2DList = append(*pThePolygon2DList, thePolygon2DFromPolyline)
 		}
 	}
 	return nil
@@ -347,13 +345,10 @@ func ParseTmxLayersAndGroups(pTmxMapIns *TmxMap, gidBoundariesMap map[int]StrToP
 	for _, objGroup := range pTmxMapIns.ObjectGroups {
 		switch objGroup.Name {
 		case "PlayerStartingPos":
-			var pTheVec2DListToCache *Vec2DList
-			_, ok := toRetStrToVec2DListMap[objGroup.Name]
-			if false == ok {
-				pTheVec2DListToCache = &Vec2DList{
-					Eles: make([]*Vec2D, 0),
-				}
-				toRetStrToVec2DListMap[objGroup.Name] = pTheVec2DListToCache
+			var pTheVec2DListToCache *[]*Vec2D = nil
+			if _, ok := toRetStrToVec2DListMap[objGroup.Name]; !ok {
+				tmp := make([]*Vec2D, 0)
+				toRetStrToVec2DListMap[objGroup.Name] = &tmp
 			}
 			pTheVec2DListToCache = toRetStrToVec2DListMap[objGroup.Name]
 			for _, singleObjInTmxFile := range objGroup.Objects {
@@ -362,32 +357,50 @@ func ParseTmxLayersAndGroups(pTmxMapIns *TmxMap, gidBoundariesMap map[int]StrToP
 					Y: singleObjInTmxFile.Y,
 				}
 				thePosInWorld := pTmxMapIns.continuousObjLayerOffsetToContinuousMapNodePos(theUntransformedPos)
-				pTheVec2DListToCache.Eles = append(pTheVec2DListToCache.Eles, &thePosInWorld)
+				*pTheVec2DListToCache = append(*pTheVec2DListToCache, &thePosInWorld)
 			}
 		case "Barrier":
 			// Note that in this case, the "Polygon2D.Anchor" of each "TmxOrTsxObject" is exactly overlapping with "Polygon2D.Points[0]".
-			var pThePolygon2DListToCache *Polygon2DList
-			_, ok := toRetStrToPolygon2DListMap[objGroup.Name]
-			if false == ok {
-				pThePolygon2DListToCache = &Polygon2DList{
-					Eles: make([]*Polygon2D, 0),
-				}
-				toRetStrToPolygon2DListMap[objGroup.Name] = pThePolygon2DListToCache
+			var pThePolygon2DListToCache *[]*Polygon2D = nil
+			if _, ok := toRetStrToPolygon2DListMap[objGroup.Name]; !ok {
+				tmp := make([]*Polygon2D, 0)
+				toRetStrToPolygon2DListMap[objGroup.Name] = &tmp
 			}
+			pThePolygon2DListToCache = toRetStrToPolygon2DListMap[objGroup.Name]

 			for _, singleObjInTmxFile := range objGroup.Objects {
 				if nil == singleObjInTmxFile.Polyline {
-					continue
-				}
-				if nil == singleObjInTmxFile.Properties.Property || "boundary_type" != singleObjInTmxFile.Properties.Property[0].Name || "barrier" != singleObjInTmxFile.Properties.Property[0].Value {
-					continue
+					pts := make([]*Vec2D, 4)
+					s := make([]string, 0)
+					pts[0] = &Vec2D{
+						X: float64(0),
+						Y: float64(0),
+					}
+					pts[1] = &Vec2D{
+						X: float64(0),
+						Y: singleObjInTmxFile.Height,
+					}
+					pts[2] = &Vec2D{
+						X: singleObjInTmxFile.Width,
+						Y: singleObjInTmxFile.Height,
+					}
+					pts[3] = &Vec2D{
+						X: singleObjInTmxFile.Width,
+						Y: float64(0),
+					}
+					for _, pt := range pts {
+						s = append(s, fmt.Sprintf("%v,%v", pt.X, pt.Y))
+					}
+					singleObjInTmxFile.Polyline = &TmxOrTsxPolyline{
+						Points: strings.Join(s, " "),
+					}
 				}

 				thePolygon2DInWorld, err := tmxPolylineToPolygon2D(pTmxMapIns, singleObjInTmxFile, singleObjInTmxFile.Polyline)
 				if nil != err {
 					panic(err)
 				}
-				pThePolygon2DListToCache.Eles = append(pThePolygon2DListToCache.Eles, thePolygon2DInWorld)
+				*pThePolygon2DListToCache = append(*pThePolygon2DListToCache, thePolygon2DInWorld)
 			}
 		default:
 		}
--- a/dragonBonesProjects/SoldierFireGhost.dbproj
+++ b/dragonBonesProjects/SoldierFireGhost.dbproj
--- a/dragonBonesProjects/SoldierWaterGhost.dbproj
+++ b/dragonBonesProjects/SoldierWaterGhost.dbproj
--- a/frontend/assets/plugin_scripts/constants.js
+++ b/frontend/assets/plugin_scripts/constants.js
@@ -23,9 +23,9 @@ var constants = {
    FILE_NAME: {
      TREASURE_PICKEDUP: "TreasurePicked",
      CRASHED_BY_TRAP_BULLET: "CrashedByTrapBullet",
-      HIGH_SCORE_TREASURE_PICKED:"HighScoreTreasurePicked",
-      COUNT_DOWN_10SEC_TO_END:"countDown10SecToEnd",
-      BGM: "BGM" 
+      HIGH_SCORE_TREASURE_PICKED: "HighScoreTreasurePicked",
+      COUNT_DOWN_10SEC_TO_END: "countDown10SecToEnd",
+      BGM: "BGM"
    }
  },
  ROUTE_PATH: (_ROUTE_PATH = {
@@ -55,39 +55,41 @@ var constants = {
  },
  RET_CODE: {
    /**
-    * NOTE: The "RET_CODE"s from 1000-1015 are reserved for the websocket "WebsocketStdCloseCode"s.
+    * NOTE: The "RET_CODE"s from 1000-1015 are reserved for the websocket "WebsocketStdCloseCode"s, custom codes should be between 3000-4999
    *
    * References
    * - https://tools.ietf.org/html/rfc6455#section-7.4
    * - https://godoc.org/github.com/gorilla/websocket#pkg-constants.
    */
-    "__comment__": "基础",
-    "OK": 9000,
-    "UNKNOWN_ERROR": 9001,
-    "INVALID_REQUEST_PARAM": 9002,
-    "IS_TEST_ACC": 9003,
-    "MYSQL_ERROR": 9004,
-    "NONEXISTENT_ACT": 9005,
-    "LACK_OF_DIAMOND": 9006,
-    "LACK_OF_GOLD": 9007,
-    "LACK_OF_ENERGY": 9008,
-    "NONEXISTENT_ACT_HANDLER": 9009,
-    "LOCALLY_NO_AVAILABLE_ROOM": 9010,
-    "LOCALLY_NO_SPECIFIED_ROOM": 9011,
-    "PLAYER_NOT_ADDABLE_TO_ROOM": 9012,
-    "PLAYER_NOT_READDABLE_TO_ROOM": 9013,
-    "PLAYER_NOT_FOUND": 9014,
-    "PLAYER_CHEATING": 9015,
-  
+    "__comment__": "Websocket",
+    "OK": 3000,
+    "UNKNOWN_ERROR": 3001,
+    "INVALID_REQUEST_PARAM": 3002,
+    "IS_TEST_ACC": 3003,
+    "MYSQL_ERROR": 3004,
+    "NONEXISTENT_ACT": 3005,
+    "LACK_OF_DIAMOND": 3006,
+    "LACK_OF_GOLD": 3007,
+    "LACK_OF_ENERGY": 3008,
+    "NONEXISTENT_ACT_HANDLER": 3009,
+    "LOCALLY_NO_AVAILABLE_ROOM": 3010,
+    "LOCALLY_NO_SPECIFIED_ROOM": 3011,
+    "PLAYER_NOT_ADDABLE_TO_ROOM": 3012,
+    "PLAYER_NOT_READDABLE_TO_ROOM": 3013,
+    "PLAYER_NOT_FOUND": 3014,
+    "PLAYER_CHEATING": 3015,
+    "WECHAT_SERVER_ERROR": 3016,
+    "IS_BOT_ACC": 3017,
+    "ACTIVE_WATCHDOG": 3018,
+    "BATTLE_STOPPED": 3019,
+    "CLIENT_MISMATCHED_RENDER_FRAME": 3020,

-    "__comment__": "SMS",
-    "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 5001,
-    "SMS_CAPTCHA_NOT_MATCH": 5002,
+    "__comment__": "OTHERS",
    "INVALID_TOKEN": 2001,

    "DUPLICATED": 2002,
    "INCORRECT_HANDLE": 2004,
-    "NONEXISTENT_HANDLE": 2005,
+
    "INCORRECT_PASSWORD": 2006,
    "INCORRECT_CAPTCHA": 2007,
    "INVALID_EMAIL_LITERAL": 2008,
@@ -99,9 +101,14 @@ var constants = {
    "FAILED_TO_DELETE": 2015,
    "FAILED_TO_CREATE": 2016,
    "INCORRECT_PHONE_NUMBER": 2018,
-    "PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY": 4000,
-    "TRADE_CREATION_TOO_FREQUENTLY": 4002,
-    "MAP_NOT_UNLOCKED": 4003,
+    "INSUFFICIENT_MEM_TO_ALLOCATE_CONNECTION": 2019,
+    "PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY": 2020,
+    "TRADE_CREATION_TOO_FREQUENTLY": 2021,
+    "MAP_NOT_UNLOCKED": 2022,
+
+    "GET_SMS_CAPTCHA_RESP_ERROR_CODE": 2023,
+    "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 2024,
+    "SMS_CAPTCHA_NOT_MATCH": 2025,

    "NOT_IMPLEMENTED_YET": 65535
  },
--- a/frontend/assets/plugin_scripts/jsexport.js
+++ b/frontend/assets/plugin_scripts/jsexport.js
--- a/frontend/assets/plugin_scripts/jsexport.js.meta
+++ b/frontend/assets/plugin_scripts/jsexport.js.meta
@@ -0,0 +1,9 @@
+{
+  "ver": "1.0.5",
+  "uuid": "d41313ca-b2c3-4436-a05f-7e0eb290b1e6",
+  "isPlugin": true,
+  "loadPluginInWeb": true,
+  "loadPluginInNative": true,
+  "loadPluginInEditor": false,
+  "subMetas": {}
+}
--- a/frontend/assets/resources/animation/SolderWaterGhost/SoldierWaterGhost_ske.json
+++ b/frontend/assets/resources/animation/SolderWaterGhost/SoldierWaterGhost_ske.json
--- a/frontend/assets/resources/animation/SolderWaterGhost/SoldierWaterGhost_ske.json.meta
+++ b/frontend/assets/resources/animation/SolderWaterGhost/SoldierWaterGhost_ske.json.meta
--- a/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_ske.json
+++ b/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_ske.json
--- a/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_ske.json.meta
+++ b/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_ske.json.meta
--- a/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_tex.json
+++ b/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_tex.json
@@ -1 +1 @@
-{"width":64,"imagePath":"SoldierFireGhost_tex.png","SubTexture":[{"frameWidth":12,"y":42,"frameHeight":11,"width":11,"frameX":-1,"height":11,"name":"biu","frameY":0,"x":16},{"width":5,"y":42,"height":7,"name":"rightArm","x":29},{"frameWidth":15,"y":27,"frameHeight":16,"width":13,"frameX":-1,"height":16,"name":"yinmoqe00","frameY":0,"x":1},{"width":17,"y":1,"height":21,"name":"body","x":28},{"width":5,"y":42,"height":7,"name":"rightShoulder","x":36},{"width":10,"y":45,"height":9,"name":"rightFrontArm","x":1},{"width":7,"y":56,"height":7,"name":"rightHand","x":1},{"width":6,"y":55,"height":6,"name":"leftArm","x":32},{"width":7,"y":55,"height":6,"name":"leftShoulder","x":23},{"width":10,"y":27,"height":11,"name":"leftFrontArm","x":16},{"width":17,"y":24,"height":16,"name":"head","x":28},{"width":25,"y":1,"height":24,"name":"head2","x":1},{"width":8,"y":55,"height":7,"name":"leftHand","x":13},{"frameWidth":4,"y":51,"frameHeight":4,"width":2,"frameX":-1,"height":2,"name":"huomiao01","frameY":-1,"x":29}],"height":64,"name":"SoldierFireGhost"}
+{"imagePath":"SoldierFireGhost_tex.png","width":64,"height":64,"name":"SoldierFireGhost","SubTexture":[{"frameY":0,"y":42,"frameWidth":12,"frameHeight":11,"width":11,"height":11,"name":"biu","frameX":-1,"x":16},{"width":5,"y":42,"height":7,"name":"rightArm","x":29},{"frameY":0,"y":27,"frameWidth":15,"frameHeight":16,"width":13,"height":16,"name":"yinmoqe00","frameX":-1,"x":1},{"width":17,"y":1,"height":21,"name":"body","x":28},{"width":5,"y":42,"height":7,"name":"rightShoulder","x":36},{"width":10,"y":45,"height":9,"name":"rightFrontArm","x":1},{"width":7,"y":56,"height":7,"name":"rightHand","x":1},{"width":6,"y":55,"height":6,"name":"leftArm","x":32},{"width":7,"y":55,"height":6,"name":"leftShoulder","x":23},{"width":10,"y":27,"height":11,"name":"leftFrontArm","x":16},{"width":25,"y":1,"height":24,"name":"head2","x":1},{"width":17,"y":24,"height":16,"name":"head","x":28},{"width":8,"y":55,"height":7,"name":"leftHand","x":13},{"frameY":-1,"y":51,"frameWidth":4,"frameHeight":4,"width":2,"height":2,"name":"huomiao01","frameX":-1,"x":29}]}
--- a/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_tex.json.meta
+++ b/frontend/assets/resources/animation/SoldierFireGhost/SoldierFireGhost_tex.json.meta
@@ -1,7 +1,7 @@
 {
  "ver": "1.0.0",
  "uuid": "4a9187d5-a9ad-4464-a03c-d2f3cc277051",
-  "atlasJson": "{\"width\":64,\"imagePath\":\"SoldierFireGhost_tex.png\",\"SubTexture\":[{\"frameWidth\":12,\"y\":42,\"frameHeight\":11,\"width\":11,\"frameX\":-1,\"height\":11,\"name\":\"biu\",\"frameY\":0,\"x\":16},{\"width\":5,\"y\":42,\"height\":7,\"name\":\"rightArm\",\"x\":29},{\"frameWidth\":15,\"y\":27,\"frameHeight\":16,\"width\":13,\"frameX\":-1,\"height\":16,\"name\":\"yinmoqe00\",\"frameY\":0,\"x\":1},{\"width\":17,\"y\":1,\"height\":21,\"name\":\"body\",\"x\":28},{\"width\":5,\"y\":42,\"height\":7,\"name\":\"rightShoulder\",\"x\":36},{\"width\":10,\"y\":45,\"height\":9,\"name\":\"rightFrontArm\",\"x\":1},{\"width\":7,\"y\":56,\"height\":7,\"name\":\"rightHand\",\"x\":1},{\"width\":6,\"y\":55,\"height\":6,\"name\":\"leftArm\",\"x\":32},{\"width\":7,\"y\":55,\"height\":6,\"name\":\"leftShoulder\",\"x\":23},{\"width\":10,\"y\":27,\"height\":11,\"name\":\"leftFrontArm\",\"x\":16},{\"width\":17,\"y\":24,\"height\":16,\"name\":\"head\",\"x\":28},{\"width\":25,\"y\":1,\"height\":24,\"name\":\"head2\",\"x\":1},{\"width\":8,\"y\":55,\"height\":7,\"name\":\"leftHand\",\"x\":13},{\"frameWidth\":4,\"y\":51,\"frameHeight\":4,\"width\":2,\"frameX\":-1,\"height\":2,\"name\":\"huomiao01\",\"frameY\":-1,\"x\":29}],\"height\":64,\"name\":\"SoldierFireGhost\"}",
+  "atlasJson": "{\"imagePath\":\"SoldierFireGhost_tex.png\",\"width\":64,\"height\":64,\"name\":\"SoldierFireGhost\",\"SubTexture\":[{\"frameY\":0,\"y\":42,\"frameWidth\":12,\"frameHeight\":11,\"width\":11,\"height\":11,\"name\":\"biu\",\"frameX\":-1,\"x\":16},{\"width\":5,\"y\":42,\"height\":7,\"name\":\"rightArm\",\"x\":29},{\"frameY\":0,\"y\":27,\"frameWidth\":15,\"frameHeight\":16,\"width\":13,\"height\":16,\"name\":\"yinmoqe00\",\"frameX\":-1,\"x\":1},{\"width\":17,\"y\":1,\"height\":21,\"name\":\"body\",\"x\":28},{\"width\":5,\"y\":42,\"height\":7,\"name\":\"rightShoulder\",\"x\":36},{\"width\":10,\"y\":45,\"height\":9,\"name\":\"rightFrontArm\",\"x\":1},{\"width\":7,\"y\":56,\"height\":7,\"name\":\"rightHand\",\"x\":1},{\"width\":6,\"y\":55,\"height\":6,\"name\":\"leftArm\",\"x\":32},{\"width\":7,\"y\":55,\"height\":6,\"name\":\"leftShoulder\",\"x\":23},{\"width\":10,\"y\":27,\"height\":11,\"name\":\"leftFrontArm\",\"x\":16},{\"width\":25,\"y\":1,\"height\":24,\"name\":\"head2\",\"x\":1},{\"width\":17,\"y\":24,\"height\":16,\"name\":\"head\",\"x\":28},{\"width\":8,\"y\":55,\"height\":7,\"name\":\"leftHand\",\"x\":13},{\"frameY\":-1,\"y\":51,\"frameWidth\":4,\"frameHeight\":4,\"width\":2,\"height\":2,\"name\":\"huomiao01\",\"frameX\":-1,\"x\":29}]}",
  "texture": "700d963b-2192-4219-a066-8be5b3db7453",
  "subMetas": {}
 }
--- a/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Atk1.anim
+++ b/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Atk1.anim
@@ -1,229 +0,0 @@
-{
-  "__type__": "cc.AnimationClip",
-  "_name": "Atk1",
-  "_objFlags": 0,
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-  "sample": 60,
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--- a/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Atked1.anim
+++ b/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Atked1.anim
@@ -1,133 +0,0 @@
-{
-  "__type__": "cc.AnimationClip",
-  "_name": "Atked1",
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--- a/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Idle1.anim
+++ b/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Idle1.anim
@@ -1,432 +0,0 @@
-{
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+++ b/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/SoldierFireGhost.plist
--- a/frontend/assets/resources/animation/SoldierFireGhost/frameAnim/SoldierFireGhost.plist.meta
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   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -18,0.666667 -18.6667,95.3333 0,95.3333"/>
  </object>
-  <object id="23" x="786" y="1058.67">
+  <object id="67" x="784" y="1456" width="256" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0,-52.6667 -20,-52 -19.3333,-1.33333"/>
  </object>
-  <object id="24" x="1118.67" y="749.333">
+  <object id="73" x="784" y="1568" width="96" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -0.666667,-94 -254,-93.3333 -256.667,1.33333"/>
  </object>
-  <object id="25" x="1168" y="975.333">
+  <object id="74" x="816" y="1584" width="96" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0,16.6667 224.667,17.3333 225.333,-2"/>
  </object>
-  <object id="28" x="1394.67" y="958">
+  <object id="79" x="640" y="1616" width="1056" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -210.667,1.33333 -210.667,17.3333 -2,18"/>
  </object>
-  <object id="29" x="1119" y="654.5">
+  <object id="83" x="640" y="480" width="1056" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0,63.5 272.5,65 273,-1"/>
  </object>
-  <object id="30" x="1136.5" y="717.5">
+  <object id="84" x="640" y="480" width="16" height="1152">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -0.5,17 255,17.5 255,1.5"/>
  </object>
-  <object id="31" x="1152" y="735.667">
+  <object id="85" x="1680" y="480" width="16" height="1152">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0,15 80.3333,15.3333 80.3333,-2"/>
  </object>
-  <object id="32" x="1280.67" y="734.667">
+  <object id="86" x="1104" y="1408" width="96" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -0.666667,64.3333 48,65 48,0"/>
  </object>
-  <object id="34" x="1329" y="783">
+  <object id="87" x="1456" y="1568" width="224" height="48">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 63.3333,0.333333 63,-48.3333 -0.666667,-48.3333"/>
  </object>
-  <object id="35" x="1296.67" y="799">
+  <object id="88" x="1264" y="1584" width="16" height="32">
   <properties>
    <property name="boundary_type" value="barrier"/>
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-   <polyline points="0,0 -0.666667,31.3333 31.3333,31.6667 31.3333,-0.333333"/>
  </object>
-  <object id="36" x="1280" y="848">
+  <object id="89" x="1280" y="1600" width="16" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0.333333,62 112,63 111.667,-1.33333"/>
  </object>
-  <object id="37" x="1392.33" y="911.333">
+  <object id="90" x="1232" y="1408" width="304" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 -81.3333,-0.666667 -81,45 -0.666667,46.3333"/>
  </object>
-  <object id="38" x="1344.33" y="800.667">
+  <object id="91" x="1440" y="1584" width="16" height="32">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="92" x="1424" y="1600" width="16" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="93" x="1488" y="1552" width="192" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="94" x="1504" y="1536" width="176" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="95" x="1520" y="1520" width="160" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="96" x="1568" y="1408" width="16" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="97" x="1248" y="1328" width="158" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="98" x="1280" y="1312" width="96" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="99" x="1536" y="1504" width="144" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="100" x="1552" y="1488" width="128" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="101" x="1568" y="1472" width="112" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="102" x="1584" y="1456" width="96" height="16">
+   <properties>
+    <property name="boundary_type" value="barrier"/>
+   </properties>
+  </object>
+  <object id="103" x="1600" y="1440" width="80" height="16">
   <properties>
    <property name="boundary_type" value="barrier"/>
   </properties>
-   <polyline points="0,0 0,46.3333 47,46.3333 47,-1"/>
  </object>
 </objectgroup>
 </map>
--- a/frontend/assets/resources/pbfiles/room_downsync_frame.proto
+++ b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
@@ -9,28 +9,32 @@ message PlayerDownsync {
  int32 virtualGridX = 2; 
  int32 virtualGridY = 3; 
  int32 dirX = 4;
-  int32 dirY = 5;
-  int32 speed = 6; // in terms of virtual grid units
-  int32 battleState = 7;
-  int32 joinIndex = 8;
-  double colliderRadius = 9;
-  bool removed = 10;
-  int32 score = 11;
-  int32 lastMoveGmtMillis = 12;
-  int32 framesToRecover = 13;
-  int32 hp = 14;
-  int32 maxHp = 15;
-  int32 characterState = 16;
+  int32 dirY = 5; // "dirX" and "dirY" determines character facing  
+  int32 velX = 6; 
+  int32 velY = 7; // "velX" and "velY" is used to record the accumulated effect by accelerations (including gravity)
+  int32 speed = 8; // this is the instantaneous scalar attribute of a character, different from but will be accounted in "velX" and "velY" 
+  int32 battleState = 9;
+  int32 joinIndex = 10;
+  double colliderRadius = 11;
+  bool removed = 12;
+  int32 score = 13;
+  int32 lastMoveGmtMillis = 14;
+  int32 framesToRecover = 15;
+  int32 hp = 16;
+  int32 maxHp = 17;
+  int32 characterState = 18;
+  bool inAir = 19; // by design a standalone field only inferred by the collision result of "applyInputFrameDownsyncDynamicsOnSingleRenderFrame" instead of "characterState", because we need check the transition for "characterState" from this field, i.e. "inAir (prev -> curr)"  

-  string name = 17;
-  string displayName = 18;
-  string avatar = 19;
+  string name = 20;
+  string displayName = 21;
+  string avatar = 22;
 }

 message InputFrameDecoded {
  int32 dx = 1;
  int32 dy = 2;
  int32 btnALevel = 3;
+  int32 btnBLevel = 4;
 }

 message InputFrameUpsync {
@@ -72,6 +76,7 @@ message InputsBufferSnapshot {
  int32 refRenderFrameId = 1;    
  uint64 unconfirmedMask = 2;
  repeated InputFrameDownsync toSendInputFrameDownsyncs = 3;
+  bool shouldForceResync = 4;
 }

 message MeleeBullet { 
@@ -85,60 +90,71 @@ message MeleeBullet {
  int32 recoveryFrames = 4;
  int32 recoveryFramesOnBlock = 5; 
  int32 recoveryFramesOnHit = 6;  
-  sharedprotos.Vec2D moveforward = 7;  
-  double hitboxOffset = 8;  
-  sharedprotos.Vec2D hitboxSize = 9;    
-  int32 originatedRenderFrameId = 10; 
+  double hitboxOffset = 7;  
+  int32 originatedRenderFrameId = 8; 

  // for defender
-  int32 hitStunFrames = 11; 
-  int32 blockStunFrames = 12; 
-  double pushback = 13;  
+  int32 hitStunFrames = 9; 
+  int32 blockStunFrames = 10; 
+  double pushback = 11;  

-  int32 releaseTriggerType = 14; // 1: rising-edge, 2: falling-edge  
-  int32 damage = 15;   
+  int32 releaseTriggerType = 12; // 1: rising-edge, 2: falling-edge  
+  int32 damage = 13;   

-  int32 offenderJoinIndex = 16;    
-  int32 offenderPlayerId = 17;    
+  int32 offenderJoinIndex = 14;    
+  int32 offenderPlayerId = 15;    
+
+  double hitboxSizeX = 16; 
+  double hitboxSizeY = 17;
+
+  double selfMoveforwardX = 18;  
+  double selfMoveforwardY = 19;  
 } 

 message BattleColliderInfo {
  string stageName = 1;
-  map<string, sharedprotos.Vec2DList> strToVec2DListMap = 2; 
-  map<string, sharedprotos.Polygon2DList> strToPolygon2DListMap = 3; 
-  int32 stageDiscreteW = 4;
-  int32 stageDiscreteH = 5;
-  int32 stageTileW = 6;
-  int32 stageTileH = 7;
+  int32 stageDiscreteW = 2;
+  int32 stageDiscreteH = 3;
+  int32 stageTileW = 4;
+  int32 stageTileH = 5;

-  int32 intervalToPing        = 8;
-  int32 willKickIfInactiveFor = 9;
-  int32 boundRoomId           = 10;
-  int32 battleDurationFrames  = 12;
-  int64 battleDurationNanos   = 13;
-  int32 serverFps             = 14;
-  int32 inputDelayFrames      = 15; // in the count of render frames
-  uint32 inputScaleFrames     = 16; // inputDelayedAndScaledFrameId = ((originalFrameId - InputDelayFrames) >> InputScaleFrames)
-  int32 nstDelayFrames        = 17; // network-single-trip delay in the count of render frames, proposed to be (InputDelayFrames >> 1) because we expect a round-trip delay to be exactly "InputDelayFrames"
-  int32 inputFrameUpsyncDelayTolerance = 18;  
-  int32 maxChasingRenderFramesPerUpdate = 19;
-  int32 playerBattleState = 20;
-  double rollbackEstimatedDtMillis = 21;
-  int64 rollbackEstimatedDtNanos = 22;
+  int32 intervalToPing        = 6;
+  int32 willKickIfInactiveFor = 7;
+  int32 boundRoomId           = 8;
+  int32 battleDurationFrames  = 9;
+  int64 battleDurationNanos   = 10;
+  int32 serverFps             = 11;
+  int32 inputDelayFrames      = 12; // in the count of render frames
+  uint32 inputScaleFrames     = 13; // inputDelayedAndScaledFrameId = ((originalFrameId - InputDelayFrames) >> InputScaleFrames)
+  int32 nstDelayFrames        = 14; // network-single-trip delay in the count of render frames, proposed to be (InputDelayFrames >> 1) because we expect a round-trip delay to be exactly "InputDelayFrames"
+  int32 inputFrameUpsyncDelayTolerance = 15;  
+  int32 maxChasingRenderFramesPerUpdate = 16;
+  int32 playerBattleState = 17;
+  double rollbackEstimatedDtMillis = 18;
+  int64 rollbackEstimatedDtNanos = 19;
 
-  double worldToVirtualGridRatio = 23;
-  double virtualGridToWorldRatio = 24;
+  double worldToVirtualGridRatio = 20;
+  double virtualGridToWorldRatio = 21;

-  int32 spAtkLookupFrames = 25;
-  int32 renderCacheSize = 26;
+  int32 spAtkLookupFrames = 22;
+  int32 renderCacheSize = 23;

-  map<int32, MeleeBullet> meleeSkillConfig = 27; // skillId -> skill
+  double snapIntoPlatformOverlap = 24; 
+  double snapIntoPlatformThreshold = 25; 
+  int32 jumpingInitVelY = 26;
+  int32 gravityX = 27;
+  int32 gravityY = 28;
+  int32 collisionMinStep = 29;
+
+  bool frameDataLoggingEnabled = 999;
 }

 message RoomDownsyncFrame {
  int32 id = 1;
-  map<int32, PlayerDownsync> players = 2;
+  repeated PlayerDownsync playersArr = 2;
  int64 countdownNanos = 3;
  repeated MeleeBullet meleeBullets = 4; // I don't know how to mimic inheritance/composition in protobuf by far, thus using an array for each type of bullet as a compromise 
  uint64 backendUnconfirmedMask = 5; // Indexed by "joinIndex", same compression concern as stated in InputFrameDownsync
+  bool shouldForceResync = 6;
+  map<int32, int32> playerOpPatternToSkillId = 7; 
 }
--- a/frontend/assets/resources/prefabs/ControlledCharacter.prefab
+++ b/frontend/assets/resources/prefabs/ControlledCharacter.prefab
@@ -33,14 +33,14 @@
    "_active": true,
    "_components": [
      {
-        "__id__": 20
+        "__id__": 23
      },
      {
-        "__id__": 21
+        "__id__": 24
      }
    ],
    "_prefab": {
-      "__id__": 22
+      "__id__": 25
    },
    "_opacity": 255,
    "_color": {
@@ -65,7 +65,7 @@
      "ctor": "Float64Array",
      "array": [
        0,
-        3,
+        0,
        0,
        0,
        0,
@@ -116,8 +116,8 @@
    },
    "_contentSize": {
      "__type__": "cc.Size",
-      "width": 46.68,
-      "height": 27.72
+      "width": 28.01,
+      "height": 15.12
    },
    "_anchorPoint": {
      "__type__": "cc.Vec2",
@@ -128,8 +128,8 @@
      "__type__": "TypedArray",
      "ctor": "Float64Array",
      "array": [
-        -5,
-        50,
+        0,
+        45,
        0,
        0,
        0,
@@ -169,8 +169,8 @@
    "_useOriginalSize": false,
    "_string": "(0, 0)",
    "_N$string": "(0, 0)",
-    "_fontSize": 20,
-    "_lineHeight": 22,
+    "_fontSize": 12,
+    "_lineHeight": 12,
    "_enableWrapText": true,
    "_N$file": null,
    "_isSystemFontUsed": true,
@@ -277,7 +277,7 @@
      "__uuid__": "472df5d3-35e7-4184-9e6c-7f41bee65ee3"
    },
    "_texture": null,
-    "_stopped": false,
+    "_stopped": true,
    "playOnLoad": true,
    "autoRemoveOnFinish": false,
    "totalParticles": 200,
@@ -395,8 +395,8 @@
    },
    "_contentSize": {
      "__type__": "cc.Size",
-      "width": 76,
-      "height": 84
+      "width": 24,
+      "height": 24
    },
    "_anchorPoint": {
      "__type__": "cc.Vec2",
@@ -408,7 +408,7 @@
      "ctor": "Float64Array",
      "array": [
        3,
-        182,
+        60,
        0,
        0,
        0,
@@ -451,7 +451,7 @@
      "__uuid__": "a2170e4c-df31-41ef-be73-f4f605e75821"
    },
    "_type": 0,
-    "_sizeMode": 1,
+    "_sizeMode": 0,
    "_fillType": 0,
    "_fillCenter": {
      "__type__": "cc.Vec2",
@@ -490,12 +490,15 @@
      },
      {
        "__id__": 15
+      },
+      {
+        "__id__": 18
      }
    ],
    "_active": true,
    "_components": [],
    "_prefab": {
-      "__id__": 19
+      "__id__": 22
    },
    "_opacity": 255,
    "_color": {
@@ -584,7 +587,7 @@
      "ctor": "Float64Array",
      "array": [
        0,
-        0,
+        -24,
        0,
        0,
        0,
@@ -671,13 +674,128 @@
    "_components": [
      {
        "__id__": 16
-      },
-      {
-        "__id__": 17
      }
    ],
    "_prefab": {
-      "__id__": 18
+      "__id__": 17
+    },
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 0,
+      "height": 0
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        0,
+        -24,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+        1
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": ""
+  },
+  {
+    "__type__": "dragonBones.ArmatureDisplay",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 15
+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_armatureName": "SoldierFireGhost",
+    "_animationName": "Idle1",
+    "_preCacheMode": 0,
+    "_cacheMode": 0,
+    "playTimes": -1,
+    "premultipliedAlpha": false,
+    "_armatureKey": "36230012-8df3-4e85-afad-76ec47d0e4d7#4a9187d5-a9ad-4464-a03c-d2f3cc277051",
+    "_accTime": 0,
+    "_playCount": 0,
+    "_frameCache": null,
+    "_curFrame": null,
+    "_playing": false,
+    "_armatureCache": null,
+    "_N$dragonAsset": {
+      "__uuid__": "36230012-8df3-4e85-afad-76ec47d0e4d7"
+    },
+    "_N$dragonAtlasAsset": {
+      "__uuid__": "4a9187d5-a9ad-4464-a03c-d2f3cc277051"
+    },
+    "_N$_defaultArmatureIndex": 0,
+    "_N$_animationIndex": 8,
+    "_N$_defaultCacheMode": 0,
+    "_N$timeScale": 1,
+    "_N$debugBones": false,
+    "_N$enableBatch": false,
+    "_id": ""
+  },
+  {
+    "__type__": "cc.PrefabInfo",
+    "root": {
+      "__id__": 1
+    },
+    "asset": {
+      "__uuid__": "59bff7a2-23e1-4d69-bce7-afb37eae196a"
+    },
+    "fileId": "3b2LJFABVL7ozO2U81FC4U",
+    "sync": false
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "UltramanTiga",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 11
+    },
+    "_children": [],
+    "_active": false,
+    "_components": [
+      {
+        "__id__": 19
+      },
+      {
+        "__id__": 20
+      }
+    ],
+    "_prefab": {
+      "__id__": 21
    },
    "_opacity": 255,
    "_color": {
@@ -708,8 +826,8 @@
        0,
        0,
        1,
-        1,
-        1,
+        0.7,
+        0.7,
        1
      ]
    },
@@ -731,7 +849,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 15
+      "__id__": 18
    },
    "_enabled": true,
    "_defaultClip": null,
@@ -745,6 +863,15 @@
      {
        "__uuid__": "c738236a-0702-45f8-aa38-99457b051997"
      },
+      {
+        "__uuid__": "c69bcceb-d7d1-4e33-9623-e2a374a0a6b6"
+      },
+      {
+        "__uuid__": "43dbf141-be76-48c3-bdef-29233ccbe30d"
+      },
+      {
+        "__uuid__": "8710591c-3f5e-4911-83e7-42cc18be6af9"
+      },
      {
        "__uuid__": "c69bcceb-d7d1-4e33-9623-e2a374a0a6b6"
      }
@@ -757,7 +884,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 15
+      "__id__": 18
    },
    "_enabled": true,
    "_materials": [
@@ -780,7 +907,7 @@
    "_fillRange": 0,
    "_isTrimmedMode": true,
    "_atlas": {
-      "__uuid__": "145769c8-a259-42bc-8cce-6e035f493c70"
+      "__uuid__": "5d522f7b-359b-4f38-ac35-55fdbee56cae"
    },
    "_id": ""
  },
@@ -792,7 +919,7 @@
    "asset": {
      "__uuid__": "59bff7a2-23e1-4d69-bce7-afb37eae196a"
    },
-    "fileId": "4c+Ci1MGpP47N3wJ0ujhEm",
+    "fileId": "17JdhftghBYr81MfV9i6cy",
    "sync": false
  },
  {
--- a/frontend/assets/resources/prefabs/ResultPanel.prefab
+++ b/frontend/assets/resources/prefabs/ResultPanel.prefab
--- a/frontend/assets/resources/prefabs/SoldierFireGhost.prefab
+++ b/frontend/assets/resources/prefabs/SoldierFireGhost.prefab
@@ -1,151 +0,0 @@
-[
-  {
-    "__type__": "cc.Prefab",
-    "_name": "",
-    "_objFlags": 0,
-    "_native": "",
-    "data": {
-      "__id__": 1
-    },
-    "optimizationPolicy": 0,
-    "asyncLoadAssets": false,
-    "readonly": false
-  },
-  {
-    "__type__": "cc.Node",
-    "_name": "SoldierFireGhost",
-    "_objFlags": 0,
-    "_parent": null,
-    "_children": [],
-    "_active": true,
-    "_components": [
-      {
-        "__id__": 2
-      },
-      {
-        "__id__": 3
-      }
-    ],
-    "_prefab": {
-      "__id__": 4
-    },
-    "_opacity": 255,
-    "_color": {
-      "__type__": "cc.Color",
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-    "_groupIndex": 0,
-    "groupIndex": 0,
-    "_id": ""
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-  {
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-    "_name": "",
-    "_objFlags": 0,
-    "node": {
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-    "_enabled": true,
-    "_defaultClip": null,
-    "_clips": [
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-    "_name": "",
-    "_objFlags": 0,
-    "node": {
-      "__id__": 1
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-    "_enabled": true,
-    "_materials": [
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-    "_srcBlendFactor": 770,
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-    "_sizeMode": 1,
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-    "_fillCenter": {
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-      "y": 0
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-    "_fillRange": 0,
-    "_isTrimmedMode": true,
-    "_atlas": {
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-    },
-    "_id": ""
-  },
-  {
-    "__type__": "cc.PrefabInfo",
-    "root": {
-      "__id__": 1
-    },
-    "asset": {
-      "__id__": 0
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-    "fileId": "44k8wsxglPsJSrMCX58Yve",
-    "sync": false
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-]
--- a/frontend/assets/resources/prefabs/SoldierFireGhost.prefab.meta
+++ b/frontend/assets/resources/prefabs/SoldierFireGhost.prefab.meta
@@ -1,8 +0,0 @@
-{
-  "ver": "1.2.5",
-  "uuid": "e3fc2487-17d1-4ff9-ae1f-38e974509077",
-  "optimizationPolicy": "AUTO",
-  "asyncLoadAssets": false,
-  "readonly": false,
-  "subMetas": {}
-}
--- a/frontend/assets/scenes/default_map.fire
+++ b/frontend/assets/scenes/default_map.fire
@@ -78,19 +78,19 @@
    "_active": true,
    "_components": [
      {
-        "__id__": 29
+        "__id__": 37
      },
      {
-        "__id__": 30
+        "__id__": 38
      },
      {
-        "__id__": 31
+        "__id__": 39
      },
      {
-        "__id__": 32
+        "__id__": 40
      },
      {
-        "__id__": 33
+        "__id__": 41
      }
    ],
    "_prefab": null,
@@ -158,7 +158,7 @@
        "__id__": 5
      },
      {
-        "__id__": 28
+        "__id__": 36
      }
    ],
    "_prefab": null,
@@ -279,13 +279,13 @@
    },
    "_children": [
      {
-        "__id__": 22
+        "__id__": 30
      }
    ],
    "_active": true,
    "_components": [
      {
-        "__id__": 27
+        "__id__": 35
      }
    ],
    "_prefab": null,
@@ -352,6 +352,12 @@
      },
      {
        "__id__": 20
+      },
+      {
+        "__id__": 22
+      },
+      {
+        "__id__": 26
      }
    ],
    "_active": true,
@@ -447,7 +453,7 @@
      "array": [
        0,
        0,
-        216.50635094610968,
+        215.81269742929726,
        0,
        0,
        0,
@@ -1043,10 +1049,10 @@
  },
  {
    "__type__": "cc.Node",
-    "_name": "JoystickBG",
+    "_name": "BtnA",
    "_objFlags": 0,
    "_parent": {
-      "__id__": 6
+      "__id__": 7
    },
    "_children": [
      {
@@ -1054,12 +1060,70 @@
      }
    ],
    "_active": true,
+    "_components": [],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        143.689,
+        -584.849,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0.66667,
+        0.66667,
+        0.66667
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "35ITFOFadFX5FVNVNUZbrn"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Background",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 22
+    },
+    "_children": [],
+    "_active": true,
    "_components": [
      {
-        "__id__": 25
+        "__id__": 24
      },
      {
-        "__id__": 26
+        "__id__": 25
      }
    ],
    "_prefab": null,
@@ -1073,8 +1137,8 @@
    },
    "_contentSize": {
      "__type__": "cc.Size",
-      "width": 400,
-      "height": 400
+      "width": 200,
+      "height": 200
    },
    "_anchorPoint": {
      "__type__": "cc.Vec2",
@@ -1108,6 +1172,324 @@
    "_is3DNode": false,
    "_groupIndex": 0,
    "groupIndex": 0,
+    "_id": "8f/j+BH3VFzowR9kS36/D8"
+  },
+  {
+    "__type__": "cc.Sprite",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 23
+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_srcBlendFactor": 770,
+    "_dstBlendFactor": 771,
+    "_spriteFrame": {
+      "__uuid__": "350fd890-3d28-4e53-9dfa-1bf00d857737"
+    },
+    "_type": 1,
+    "_sizeMode": 0,
+    "_fillType": 0,
+    "_fillCenter": {
+      "__type__": "cc.Vec2",
+      "x": 0,
+      "y": 0
+    },
+    "_fillStart": 0,
+    "_fillRange": 0,
+    "_isTrimmedMode": true,
+    "_atlas": {
+      "__uuid__": "030d9286-e8a2-40cf-98f8-baf713f0b8c4"
+    },
+    "_id": "bdYe//0u9Dj79RLi8Rt6un"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 23
+    },
+    "_enabled": true,
+    "alignMode": 0,
+    "_target": null,
+    "_alignFlags": 45,
+    "_left": 0,
+    "_right": 0,
+    "_top": 0,
+    "_bottom": 0,
+    "_verticalCenter": 0,
+    "_horizontalCenter": 0,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 100,
+    "_originalHeight": 40,
+    "_id": "98p5OL5fdGep1z6jWXKTu9"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "BtnB",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 7
+    },
+    "_children": [
+      {
+        "__id__": 27
+      }
+    ],
+    "_active": true,
+    "_components": [],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
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+      "ctor": "Float64Array",
+      "array": [
+        370.368,
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+        0.66667
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+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "92c5tbNsZPG7f09UQLXv+j"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Background",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 26
+    },
+    "_children": [],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 28
+      },
+      {
+        "__id__": 29
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
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+      "ctor": "Float64Array",
+      "array": [
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+        1
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+      "y": 0,
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+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "96xSPG8lxPZIsW+n65WcbU"
+  },
+  {
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+    "_name": "",
+    "_objFlags": 0,
+    "node": {
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+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_srcBlendFactor": 770,
+    "_dstBlendFactor": 771,
+    "_spriteFrame": {
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+    },
+    "_type": 1,
+    "_sizeMode": 0,
+    "_fillType": 0,
+    "_fillCenter": {
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+      "x": 0,
+      "y": 0
+    },
+    "_fillStart": 0,
+    "_fillRange": 0,
+    "_isTrimmedMode": true,
+    "_atlas": {
+      "__uuid__": "030d9286-e8a2-40cf-98f8-baf713f0b8c4"
+    },
+    "_id": "2euUQEzg9FdZu2ijWBxgrr"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 27
+    },
+    "_enabled": true,
+    "alignMode": 0,
+    "_target": null,
+    "_alignFlags": 45,
+    "_left": 0,
+    "_right": 0,
+    "_top": 0,
+    "_bottom": 0,
+    "_verticalCenter": 0,
+    "_horizontalCenter": 0,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 100,
+    "_originalHeight": 40,
+    "_id": "5bXB50moJH9aH7RcbRuSS5"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "JoystickBG",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 6
+    },
+    "_children": [
+      {
+        "__id__": 31
+      }
+    ],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 33
+      },
+      {
+        "__id__": 34
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 400,
+      "height": 400
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        -380,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+        1
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
    "_id": "88u3wQvvdO8pbrNWhs3ifP"
  },
  {
@@ -1115,13 +1497,13 @@
    "_name": "Joystick",
    "_objFlags": 0,
    "_parent": {
-      "__id__": 22
+      "__id__": 30
    },
    "_children": [],
    "_active": true,
    "_components": [
      {
-        "__id__": 24
+        "__id__": 32
      }
    ],
    "_prefab": null,
@@ -1177,7 +1559,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 23
+      "__id__": 31
    },
    "_enabled": true,
    "_materials": [
@@ -1211,7 +1593,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 22
+      "__id__": 30
    },
    "_enabled": true,
    "_materials": [
@@ -1245,7 +1627,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 22
+      "__id__": 30
    },
    "_enabled": true,
    "alignMode": 0,
@@ -1408,10 +1790,10 @@
      "__id__": 3
    },
    "stickhead": {
-      "__id__": 23
+      "__id__": 31
    },
    "base": {
-      "__id__": 22
+      "__id__": 30
    },
    "joyStickEps": 0.1,
    "magicLeanLowerBound": 0.414,
@@ -1431,6 +1813,12 @@
    },
    "linearMovingEps": 0.1,
    "scaleByEps": 0.0375,
+    "btnA": {
+      "__id__": 22
+    },
+    "btnB": {
+      "__id__": 26
+    },
    "_id": "e9oVYTr7ROlpp/IrNjBUmR"
  }
 ]
--- a/frontend/assets/scenes/login.fire
+++ b/frontend/assets/scenes/login.fire
@@ -440,7 +440,7 @@
      "array": [
        0,
        0,
-        210.14647688706773,
+        216.6771387800957,
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        0,
        0,
--- a/frontend/assets/scenes/offline_map_1.fire
+++ b/frontend/assets/scenes/offline_map_1.fire
@@ -58,7 +58,7 @@
    "_groupIndex": 0,
    "groupIndex": 0,
    "autoReleaseAssets": false,
-    "_id": "368b10b6-88fc-423c-9fcd-545d9fc673bd"
+    "_id": "8491a86c-bec9-4813-968a-128ca01639e0"
  },
  {
    "__type__": "cc.Node",
@@ -78,19 +78,19 @@
    "_active": true,
    "_components": [
      {
-        "__id__": 19
+        "__id__": 27
      },
      {
-        "__id__": 20
+        "__id__": 28
      },
      {
-        "__id__": 21
+        "__id__": 29
      },
      {
-        "__id__": 22
+        "__id__": 30
      },
      {
-        "__id__": 23
+        "__id__": 31
      }
    ],
    "_prefab": null,
@@ -172,8 +172,8 @@
    },
    "_contentSize": {
      "__type__": "cc.Size",
-      "width": 3200,
-      "height": 3200
+      "width": 2048,
+      "height": 2048
    },
    "_anchorPoint": {
      "__type__": "cc.Vec2",
@@ -191,8 +191,8 @@
        0,
        0,
        1,
-        2,
-        2,
+        1.5,
+        1.5,
        1
      ]
    },
@@ -249,7 +249,7 @@
    "_id": "3crA1nz5xPSLAnCSLQIPOq"
  },
  {
-    "__type__": "47d7dy4S4lB2pxqJJlGOoai",
+    "__type__": "b3810kDSWtD14RhiYzulYVI",
    "_name": "",
    "_objFlags": 0,
    "node": {
@@ -278,7 +278,8 @@
    "renderFrameIdLagTolerance": 4,
    "jigglingEps1D": 0.001,
    "bulletTriggerEnabled": true,
-    "_id": "4b+kZ46VhC0LCBixXEK2dk"
+    "closeOnForcedtoResyncNotSelf": true,
+    "_id": "e5xQdv12xLoIRr0b36Pie+"
  },
  {
    "__type__": "cc.Node",
@@ -289,13 +290,13 @@
    },
    "_children": [
      {
-        "__id__": 13
+        "__id__": 21
      }
    ],
    "_active": true,
    "_components": [
      {
-        "__id__": 18
+        "__id__": 26
      }
    ],
    "_prefab": null,
@@ -359,6 +360,12 @@
      },
      {
        "__id__": 11
+      },
+      {
+        "__id__": 13
+      },
+      {
+        "__id__": 17
      }
    ],
    "_active": true,
@@ -607,10 +614,10 @@
  },
  {
    "__type__": "cc.Node",
-    "_name": "JoystickBG",
+    "_name": "BtnA",
    "_objFlags": 0,
    "_parent": {
-      "__id__": 7
+      "__id__": 8
    },
    "_children": [
      {
@@ -618,12 +625,70 @@
      }
    ],
    "_active": true,
+    "_components": [],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
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+        0,
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+        1,
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+        0.66667,
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+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "a5pbciqqBEiYlyy7SLwP4V"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Background",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 13
+    },
+    "_children": [],
+    "_active": true,
    "_components": [
      {
-        "__id__": 16
+        "__id__": 15
      },
      {
-        "__id__": 17
+        "__id__": 16
      }
    ],
    "_prefab": null,
@@ -637,8 +702,8 @@
    },
    "_contentSize": {
      "__type__": "cc.Size",
-      "width": 400,
-      "height": 400
+      "width": 200,
+      "height": 200
    },
    "_anchorPoint": {
      "__type__": "cc.Vec2",
@@ -672,6 +737,324 @@
    "_is3DNode": false,
    "_groupIndex": 0,
    "groupIndex": 0,
+    "_id": "ffojLoj41JCpizkLkManxw"
+  },
+  {
+    "__type__": "cc.Sprite",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 14
+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_srcBlendFactor": 770,
+    "_dstBlendFactor": 771,
+    "_spriteFrame": {
+      "__uuid__": "350fd890-3d28-4e53-9dfa-1bf00d857737"
+    },
+    "_type": 1,
+    "_sizeMode": 0,
+    "_fillType": 0,
+    "_fillCenter": {
+      "__type__": "cc.Vec2",
+      "x": 0,
+      "y": 0
+    },
+    "_fillStart": 0,
+    "_fillRange": 0,
+    "_isTrimmedMode": true,
+    "_atlas": {
+      "__uuid__": "030d9286-e8a2-40cf-98f8-baf713f0b8c4"
+    },
+    "_id": "21Oz9QwBZPALzRoJujKVPG"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 14
+    },
+    "_enabled": true,
+    "alignMode": 0,
+    "_target": null,
+    "_alignFlags": 45,
+    "_left": 0,
+    "_right": 0,
+    "_top": 0,
+    "_bottom": 0,
+    "_verticalCenter": 0,
+    "_horizontalCenter": 0,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 100,
+    "_originalHeight": 40,
+    "_id": "beUmgK1D1M07I7kTL4NFLK"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "BtnB",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 8
+    },
+    "_children": [
+      {
+        "__id__": 18
+      }
+    ],
+    "_active": true,
+    "_components": [],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        370.368,
+        -424.647,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0.66667,
+        0.66667,
+        0.66667
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "9eZHUAtItPMKp7OrItdaWA"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Background",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 17
+    },
+    "_children": [],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 19
+      },
+      {
+        "__id__": 20
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 200
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        -1,
+        1
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "e2JXxje+hAC7LjZqzgq8RF"
+  },
+  {
+    "__type__": "cc.Sprite",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 18
+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_srcBlendFactor": 770,
+    "_dstBlendFactor": 771,
+    "_spriteFrame": {
+      "__uuid__": "a2170e4c-df31-41ef-be73-f4f605e75821"
+    },
+    "_type": 1,
+    "_sizeMode": 0,
+    "_fillType": 0,
+    "_fillCenter": {
+      "__type__": "cc.Vec2",
+      "x": 0,
+      "y": 0
+    },
+    "_fillStart": 0,
+    "_fillRange": 0,
+    "_isTrimmedMode": true,
+    "_atlas": {
+      "__uuid__": "030d9286-e8a2-40cf-98f8-baf713f0b8c4"
+    },
+    "_id": "54DvUzQvpKMrmsuRaQRSxf"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 18
+    },
+    "_enabled": true,
+    "alignMode": 0,
+    "_target": null,
+    "_alignFlags": 45,
+    "_left": 0,
+    "_right": 0,
+    "_top": 0,
+    "_bottom": 0,
+    "_verticalCenter": 0,
+    "_horizontalCenter": 0,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 100,
+    "_originalHeight": 40,
+    "_id": "5fVLGAIhROj6UDGotnneup"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "JoystickBG",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 7
+    },
+    "_children": [
+      {
+        "__id__": 22
+      }
+    ],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 24
+      },
+      {
+        "__id__": 25
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 400,
+      "height": 400
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        -380,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+        1
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
    "_id": "88u3wQvvdO8pbrNWhs3ifP"
  },
  {
@@ -679,13 +1062,13 @@
    "_name": "Joystick",
    "_objFlags": 0,
    "_parent": {
-      "__id__": 13
+      "__id__": 21
    },
    "_children": [],
    "_active": true,
    "_components": [
      {
-        "__id__": 15
+        "__id__": 23
      }
    ],
    "_prefab": null,
@@ -741,7 +1124,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 14
+      "__id__": 22
    },
    "_enabled": true,
    "_materials": [
@@ -775,7 +1158,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 13
+      "__id__": 21
    },
    "_enabled": true,
    "_materials": [
@@ -809,7 +1192,7 @@
    "_name": "",
    "_objFlags": 0,
    "node": {
-      "__id__": 13
+      "__id__": 21
    },
    "_enabled": true,
    "alignMode": 0,
@@ -944,10 +1327,10 @@
      "__id__": 3
    },
    "stickhead": {
-      "__id__": 14
+      "__id__": 22
    },
    "base": {
-      "__id__": 13
+      "__id__": 21
    },
    "joyStickEps": 0.1,
    "magicLeanLowerBound": 0.414,
@@ -967,6 +1350,12 @@
    },
    "linearMovingEps": 0.1,
    "scaleByEps": 0.0375,
+    "btnA": {
+      "__id__": 13
+    },
+    "btnB": {
+      "__id__": 17
+    },
    "_id": "e9oVYTr7ROlpp/IrNjBUmR"
  }
 ]
--- a/frontend/assets/scenes/offline_map_1.fire.meta
+++ b/frontend/assets/scenes/offline_map_1.fire.meta
@@ -1,6 +1,6 @@
 {
  "ver": "1.2.5",
-  "uuid": "368b10b6-88fc-423c-9fcd-545d9fc673bd",
+  "uuid": "8491a86c-bec9-4813-968a-128ca01639e0",
  "asyncLoadAssets": false,
  "autoReleaseAssets": false,
  "subMetas": {}
--- a/frontend/assets/scripts/AttackingCharacter.js
+++ b/frontend/assets/scripts/AttackingCharacter.js
@@ -5,8 +5,33 @@ window.ATK_CHARACTER_STATE = {
  Walking: [1, "Walking"],
  Atk1: [2, "Atk1"],
  Atked1: [3, "Atked1"],
+  InAirIdle1: [4, "InAirIdle1"],
+  InAirAtk1: [5, "Atk1"],
+  InAirAtked1: [6, "Atked1"],
 };

+window.toInAirConjugate = function(foo) {
+  switch (foo) {
+    case window.ATK_CHARACTER_STATE.Idle1[0]:
+    case window.ATK_CHARACTER_STATE.Walking[0]:
+      return window.ATK_CHARACTER_STATE.InAirIdle1[0];
+    case window.ATK_CHARACTER_STATE.Atk1[0]:
+      return window.ATK_CHARACTER_STATE.InAirAtk1[0];
+    case window.ATK_CHARACTER_STATE.Atked1[0]:
+      return window.ATK_CHARACTER_STATE.InAirAtked1[0];
+
+    case window.ATK_CHARACTER_STATE.InAirIdle1[0]:
+      return window.ATK_CHARACTER_STATE.Idle1[0];
+    case window.ATK_CHARACTER_STATE.InAirAtk1[0]:
+      return window.ATK_CHARACTER_STATE.Atk1[0];
+    case window.ATK_CHARACTER_STATE.InAirAtked1[0]:
+      return window.ATK_CHARACTER_STATE.Atked1[0];
+    default:
+      console.warn(`Invalid characterState ${foo} received, no in air conjugate is available!`);
+      return null;
+  }
+}
+
 window.ATK_CHARACTER_STATE_ARR = [];
 for (let k in window.ATK_CHARACTER_STATE) {
  window.ATK_CHARACTER_STATE_ARR.push(window.ATK_CHARACTER_STATE[k]);
@@ -15,6 +40,12 @@ for (let k in window.ATK_CHARACTER_STATE) {
 window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET = new Set();
 window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.Idle1[0]);
 window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.Walking[0]);
+window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.add(window.ATK_CHARACTER_STATE.InAirIdle1[0]);
+
+window.ATK_CHARACTER_STATE_IN_AIR_SET = new Set();
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirIdle1[0]);
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirAtk1[0]);
+window.ATK_CHARACTER_STATE_IN_AIR_SET.add(window.ATK_CHARACTER_STATE.InAirAtked1[0]);

 /*
 Kindly note that the use of dragonBones anim is an informed choice for the feasibility of "gotoAndPlayByFrame", which is a required feature by "Map.rollbackAndChase". You might find that "cc.Animation" -- the traditional frame anim -- can also suffice this requirement, yet if we want to develop 3D frontend in the future, working with skeletal anim will make a smoother transition.
@@ -36,7 +67,7 @@ cc.Class({
    this.speciesName = null;
    this.hp = 100;
    this.maxHp = 100;
-    this.framesToRecover = 0;
+    this.inAir = true;
  },

  setSpecies(speciesName) {
@@ -49,25 +80,24 @@ cc.Class({
    this.animComp = this.effAnimNode.getComponent(dragonBones.ArmatureDisplay);
    if (!this.animComp) {
      this.animComp = this.effAnimNode.getComponent(cc.Animation);
-      this.effAnimNode.anchorY = 0.0; // Otherwise the frame anim will show with an incorrect y-offset even if the collider boundaries are all correct!
-    }
+    } 
    this.effAnimNode.active = true;
  },

  updateCharacterAnim(rdfPlayer, prevRdfPlayer, forceAnimSwitch) {
-    // As this function might be called after many frames of a rollback, it's possible that the playing animation was predicted, different from "prevRdfPlayer.characterState" but same as "newCharacterState". More granular checks are needed to determine whether we should interrupt the playing animation.  
+    // As this function might be called after many frames of a rollback, it's possible that the playing animation was predicted, different from "prevRdfPlayer.CharacterState" but same as "newCharacterState". More granular checks are needed to determine whether we should interrupt the playing animation.  

    // Update directions
    if (this.animComp && this.animComp.node) {
-      if (0 > rdfPlayer.dirX) {
+      if (0 > rdfPlayer.DirX) {
        this.animComp.node.scaleX = (-1.0);
-      } else if (0 < rdfPlayer.dirX) {
+      } else if (0 < rdfPlayer.DirX) {
        this.animComp.node.scaleX = (1.0);
      }
    }

-    let newCharacterState = rdfPlayer.characterState;
-    const newAnimName = window.ATK_CHARACTER_STATE_ARR[newCharacterState][1];
+    let newCharacterState = rdfPlayer.CharacterState;
+    let newAnimName = window.ATK_CHARACTER_STATE_ARR[newCharacterState][1];
    let playingAnimName = null;
    let underlyingAnimationCtrl = null;

@@ -79,7 +109,7 @@ cc.Class({
      playingAnimName = (!underlyingAnimationCtrl ? null : underlyingAnimationCtrl.name);
    }

-    // It turns out that "prevRdfPlayer.characterState" is not useful in this function :)
+    // It turns out that "prevRdfPlayer.CharacterState" is not useful in this function :)
    if (newAnimName == playingAnimName && window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
      // No need to interrupt
      // console.warn(`JoinIndex=${rdfPlayer.joinIndex}, not interrupting ${newAnimName} while the playing anim is also ${playingAnimName}, player rdf changed from: ${null == prevRdfPlayer ? null : JSON.stringify(prevRdfPlayer)}, to: ${JSON.stringify(rdfPlayer)}`);
@@ -96,11 +126,11 @@ cc.Class({
  _interruptPlayingAnimAndPlayNewAnimDragonBones(rdfPlayer, prevRdfPlayer, newCharacterState, newAnimName, underlyingAnimationCtrl, playingAnimName) {
    if (window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
      // No "framesToRecover"
-      //console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
+      // console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
      underlyingAnimationCtrl.gotoAndPlayByFrame(newAnimName, 0, -1);
    } else {
      const animationData = underlyingAnimationCtrl._animations[newAnimName];
-      let fromAnimFrame = (animationData.frameCount - rdfPlayer.framesToRecover);
+      let fromAnimFrame = (animationData.frameCount - rdfPlayer.FramesToRecover);
      if (fromAnimFrame < 0) {
        // For Atk1 or Atk2, it's possible that the "meleeBullet.recoveryFrames" is configured to be slightly larger than corresponding animation duration frames
        fromAnimFrame = 0;
@@ -112,13 +142,13 @@ cc.Class({
  _interruptPlayingAnimAndPlayNewAnimFrameAnim(rdfPlayer, prevRdfPlayer, newCharacterState, newAnimName, playingAnimName) {
    if (window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
      // No "framesToRecover"
-      //console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
+      //console.warn(`#FrameAnim JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
      this.animComp.play(newAnimName, 0);
      return;
    }
    // The "playTimes" counterpart is managed by each "cc.AnimationClip.wrapMode", already preset in the editor.
    const targetClip = this.animComp.getClips()[newCharacterState]; // The clips follow the exact order in ATK_CHARACTER_STATE
-    let fromTime = (targetClip.duration - rdfPlayer.framesToRecover / targetClip.sample); // TODO: Anyway to avoid using division here?
+    let fromTime = (targetClip.duration - rdfPlayer.FramesToRecover / targetClip.sample); // TODO: Anyway to avoid using division here?
    if (fromTime < 0) {
      // For Atk1 or Atk2, it's possible that the "meleeBullet.recoveryFrames" is configured to be slightly larger than corresponding animation duration frames
      fromTime = 0;
--- a/frontend/assets/scripts/CameraTracker.js
+++ b/frontend/assets/scripts/CameraTracker.js
@@ -25,7 +25,7 @@ cc.Class({
      if (!self.mapScriptIns) return;
      if (!self.mapScriptIns.selfPlayerInfo) return;
      if (!self.mapScriptIns.playerRichInfoDict) return;
-      const selfPlayerRichInfo = self.mapScriptIns.playerRichInfoDict.get(self.mapScriptIns.selfPlayerInfo.id);
+      const selfPlayerRichInfo = self.mapScriptIns.playerRichInfoDict.get(self.mapScriptIns.selfPlayerInfo.Id);
      if (!selfPlayerRichInfo) return;
      const selfPlayerNode = selfPlayerRichInfo.node; 
      if (!selfPlayerNode) return;
--- a/frontend/assets/scripts/Map.js
+++ b/frontend/assets/scripts/Map.js
--- a/frontend/assets/scripts/OfflineMap.js
+++ b/frontend/assets/scripts/OfflineMap.js
@@ -13,8 +13,7 @@ cc.Class({
  onLoad() {
    const self = this;
    window.mapIns = self;
-
-    cc.director.getCollisionManager().enabled = false;
+    self.showCriticalCoordinateLabels = false;

    const mapNode = self.node;
    const canvasNode = mapNode.parent;
@@ -32,40 +31,32 @@ cc.Class({
    self.inputDelayFrames = 8;
    self.inputScaleFrames = 2;
    self.inputFrameUpsyncDelayTolerance = 2;
+    self.collisionMinStep = 8;

    self.renderCacheSize = 1024;
+    self.serverFps = 60;
    self.rollbackEstimatedDt = 0.016667;
    self.rollbackEstimatedDtMillis = 16.667;
    self.rollbackEstimatedDtNanos = 16666666;
+    self.tooFastDtIntervalMillis = 0.5 * self.rollbackEstimatedDtMillis;

    self.worldToVirtualGridRatio = 1000;
    self.virtualGridToWorldRatio = 1.0 / self.worldToVirtualGridRatio;
-    self.meleeSkillConfig = {
-      1: {
-        // for offender
-        startupFrames: 10,
-        activeFrames: 3,
-        recoveryFrames: 34, // usually but not always "startupFrames+activeFrames", I hereby set it to be 1 frame more than the actual animation to avoid critical transition, i.e. when the animation is 1 frame from ending but "rdfPlayer.framesToRecover" is already counted 0 and the player triggers an other same attack, making an effective bullet trigger but no animation is played due to same animName is still playing
-        recoveryFramesOnBlock: 34,
-        recoveryFramesOnHit: 34,
-        moveforward: {
-          x: 0,
-          y: 0,
-        },
-        hitboxOffset: 12.0, // should be about the radius of the PlayerCollider 
-        hitboxSize: {
-          x: 23.0,
-          y: 32.0,
-        },
+    const opJoinIndexPrefix1 = (1 << 8);
+    const opJoinIndexPrefix2 = (2 << 8);
+    self.playerOpPatternToSkillId = {};
+    self.playerOpPatternToSkillId[opJoinIndexPrefix1 + 0] = 1;
+    self.playerOpPatternToSkillId[opJoinIndexPrefix2 + 0] = 1;

-        // for defender
-        hitStunFrames: 18,
-        blockStunFrames: 9,
-        pushback: 8.0,
-        releaseTriggerType: 1, // 1: rising-edge, 2: falling-edge  
-        damage: 5
-      }
-    };
+    /* 
+    [WARNING] As when a character is standing on a barrier, if not carefully curated there MIGHT BE a bouncing sequence of "[(inAir -> dropIntoBarrier ->), (notInAir -> pushedOutOfBarrier ->)], [(inAir -> ..."
+
+    Moreover, "snapIntoPlatformOverlap" should be small enough such that the walking "velX" or jumping initial "velY" can escape from it by 1 renderFrame (when jumping is triggered, the character is waived from snappig for 1 renderFrame).
+    */
+    self.snapIntoPlatformOverlap = 0.1;
+    self.snapIntoPlatformThreshold = 0.5; // a platform must be "horizontal enough" for a character to "stand on"
+    self.jumpingInitVelY = 7 * self.worldToVirtualGridRatio; // unit: (virtual grid length/renderFrame)
+    [self.gravityX, self.gravityY] = [0, -0.5 * self.worldToVirtualGridRatio]; // unit: (virtual grid length/renderFrame^2)

    const tiledMapIns = self.node.getComponent(cc.TiledMap);

@@ -78,7 +69,16 @@ cc.Class({

      tiledMapIns.tmxAsset = null;
      mapNode.removeAllChildren();
-      self._resetCurrentMatch();
+
+      if (self.showCriticalCoordinateLabels) {
+        const drawer = new cc.Node();
+        drawer.setPosition(cc.v2(0, 0))
+        safelyAddChild(self.node, drawer);
+        setLocalZOrder(drawer, 999);
+        const g = drawer.addComponent(cc.Graphics);
+        g.lineWidth = 2;
+        self.g = g;
+      }

      tiledMapIns.tmxAsset = tmxAsset;
      const newMapSize = tiledMapIns.getMapSize();
@@ -86,17 +86,26 @@ cc.Class({
      self.node.setContentSize(newMapSize.width * newTileSize.width, newMapSize.height * newTileSize.height);
      self.node.setPosition(cc.v2(0, 0));

+      self.stageDiscreteW = newMapSize.width;
+      self.stageDiscreteH = newMapSize.height;
+      self.stageTileW = newTileSize.width;
+      self.stageTileH = newTileSize.height;
+
+      self._resetCurrentMatch();
      let barrierIdCounter = 0;
      const boundaryObjs = tileCollisionManager.extractBoundaryObjects(self.node);
      for (let boundaryObj of boundaryObjs.barriers) {
-        const x0 = boundaryObj.anchor.x,
-          y0 = boundaryObj.anchor.y;
+        const gopkgsBoundaryAnchor = gopkgs.NewVec2DJs(boundaryObj.anchor.x, boundaryObj.anchor.y);
+        const gopkgsBoundaryPts = Array.from(boundaryObj, p => {
+          return gopkgs.NewVec2DJs(p.x, p.y);
+        });
+        const gopkgsBoundary = gopkgs.NewPolygon2DJs(gopkgsBoundaryAnchor, gopkgsBoundaryPts);
+        const gopkgsBarrier = gopkgs.NewBarrierJs(gopkgsBoundary);

-        const newBarrier = self.collisionSys.createPolygon(x0, y0, Array.from(boundaryObj, p => {
-          return [p.x, p.y];
-        }));
+        const newBarrierCollider = gopkgs.GenerateConvexPolygonColliderJs(gopkgsBoundary, self.spaceOffsetX, self.spaceOffsetY, gopkgsBarrier, "Barrier");
+        self.gopkgsCollisionSys.Add(newBarrierCollider);

-        if (self.showCriticalCoordinateLabels) {
+        if (false && self.showCriticalCoordinateLabels) {
          for (let i = 0; i < boundaryObj.length; ++i) {
            const barrierVertLabelNode = new cc.Node();
            switch (i % 4) {
@@ -127,45 +136,52 @@ cc.Class({
          }

        }
-        // console.log("Created barrier: ", newBarrier);
+        // console.log("Created barrier: ", newBarrierCollider);
        ++barrierIdCounter;
        const collisionBarrierIndex = (self.collisionBarrierIndexPrefix + barrierIdCounter);
-        self.collisionSysMap.set(collisionBarrierIndex, newBarrier);
+        self.gopkgsCollisionSysMap[collisionBarrierIndex] = newBarrierCollider;
      }

      const startRdf = window.pb.protos.RoomDownsyncFrame.create({
        id: window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START,
-        players: {
-          10: {
+        playersArr: [
+          window.pb.protos.PlayerDownsync.create({
            id: 10,
            joinIndex: 1,
-            virtualGridX: 0,
-            virtualGridY: 0,
+            virtualGridX: boundaryObjs.playerStartingPositions[0].x * self.worldToVirtualGridRatio,
+            virtualGridY: boundaryObjs.playerStartingPositions[0].y * self.worldToVirtualGridRatio,
            speed: 1 * self.worldToVirtualGridRatio,
            colliderRadius: 12,
-            characterState: window.ATK_CHARACTER_STATE.Idle1[0],
+            characterState: window.ATK_CHARACTER_STATE.InAirIdle1[0],
            framesToRecover: 0,
            dirX: 0,
            dirY: 0,
-          },
-          11: {
+            velX: 0,
+            velY: 0,
+            inAir: true,
+          }),
+          window.pb.protos.PlayerDownsync.create({
            id: 11,
            joinIndex: 2,
-            virtualGridX: 80 * self.worldToVirtualGridRatio,
-            virtualGridY: 0 * self.worldToVirtualGridRatio,
+            virtualGridX: boundaryObjs.playerStartingPositions[1].x * self.worldToVirtualGridRatio,
+            virtualGridY: boundaryObjs.playerStartingPositions[1].y * self.worldToVirtualGridRatio,
            speed: 1 * self.worldToVirtualGridRatio,
            colliderRadius: 12,
-            characterState: window.ATK_CHARACTER_STATE.Idle1[0],
+            characterState: window.ATK_CHARACTER_STATE.InAirIdle1[0],
            framesToRecover: 0,
            dirX: 0,
            dirY: 0,
-          },
-        }
+            velX: 0,
+            velY: 0,
+            inAir: true,
+          }),
+        ]
      });
+
      self.selfPlayerInfo = {
-        id: 11
+        Id: 10,
+        JoinIndex: 1,
      };
-      self._initPlayerRichInfoDict(startRdf.players);
      self.onRoomDownsyncFrame(startRdf);

      self.battleState = ALL_BATTLE_STATES.IN_BATTLE;
@@ -177,7 +193,8 @@ cc.Class({
    const self = this;
    if (ALL_BATTLE_STATES.IN_BATTLE == self.battleState) {
      const elapsedMillisSinceLastFrameIdTriggered = performance.now() - self.lastRenderFrameIdTriggeredAt;
-      if (elapsedMillisSinceLastFrameIdTriggered < (self.rollbackEstimatedDtMillis)) {
+      if (elapsedMillisSinceLastFrameIdTriggered < self.tooFastDtIntervalMillis) {
+        // [WARNING] We should avoid a frontend ticking too fast to prevent cheating, as well as ticking too slow to cause a "resync avalanche" that impacts user experience!
        // console.debug("Avoiding too fast frame@renderFrameId=", self.renderFrameId, ": elapsedMillisSinceLastFrameIdTriggered=", elapsedMillisSinceLastFrameIdTriggered);
        return;
      }
@@ -187,19 +204,21 @@ cc.Class({
          currSelfInput = null;
        const noDelayInputFrameId = self._convertToInputFrameId(self.renderFrameId, 0); // It's important that "inputDelayFrames == 0" here 
        if (self.shouldGenerateInputFrameUpsync(self.renderFrameId)) {
-          const prevAndCurrInputs = self._generateInputFrameUpsync(noDelayInputFrameId);
+          const prevAndCurrInputs = self.getOrPrefabInputFrameUpsync(noDelayInputFrameId);
          prevSelfInput = prevAndCurrInputs[0];
          currSelfInput = prevAndCurrInputs[1];
        }

-        const [prevRdf, rdf] = self.rollbackAndChase(self.renderFrameId, self.renderFrameId + 1, self.collisionSys, self.collisionSysMap, false);
+        const [prevRdf, rdf] = self.rollbackAndChase(self.renderFrameId, self.renderFrameId + 1, self.gopkgsCollisionSys, self.gopkgsCollisionSysMap, false);
        self.applyRoomDownsyncFrameDynamics(rdf, prevRdf);
+        self.showDebugBoundaries(rdf);
+        ++self.renderFrameId;
+        self.lastRenderFrameIdTriggeredAt = performance.now();
        let t3 = performance.now();
      } catch (err) {
        console.error("Error during Map.update", err);
-      } finally {
-        ++self.renderFrameId; // [WARNING] It's important to increment the renderFrameId AFTER all the operations above!!!
      }
    }
  },
+
 });
--- a/frontend/assets/scripts/OfflineMap.js.meta
+++ b/frontend/assets/scripts/OfflineMap.js.meta
@@ -1,6 +1,6 @@
 {
  "ver": "1.0.5",
-  "uuid": "47d7dcb8-4b89-41da-9c6a-2499463a86a2",
+  "uuid": "b3810903-496b-43d7-8461-898cee958548",
  "isPlugin": false,
  "loadPluginInWeb": true,
  "loadPluginInNative": true,
--- a/frontend/assets/scripts/TileCollisionManagerSingleton.js
+++ b/frontend/assets/scripts/TileCollisionManagerSingleton.js
@@ -108,6 +108,7 @@ TileCollisionManager.prototype.continuousMapNodePosToContinuousObjLayerOffset =
 window.battleEntityTypeNameToGlobalGid = {};
 TileCollisionManager.prototype.extractBoundaryObjects = function(withTiledMapNode) {
  let toRet = {
+    playerStartingPositions: [],
    barriers: [],
  };
  const tiledMapIns = withTiledMapNode.getComponent(cc.TiledMap); // This is a magic name.
@@ -115,33 +116,52 @@ TileCollisionManager.prototype.extractBoundaryObjects = function(withTiledMapNod
  const allObjectGroups = tiledMapIns.getObjectGroups();
  for (let i = 0; i < allObjectGroups.length; ++i) {
    var objectGroup = allObjectGroups[i];
-    if ("barrier_and_shelter" != objectGroup.getProperty("type")) continue;
    var allObjects = objectGroup.getObjects();
-    for (let j = 0; j < allObjects.length; ++j) {
-      let object = allObjects[j];
-      let gid = object.gid;
-      if (0 < gid) {
-        continue;
-      }
-      const polylinePoints = object.polylinePoints;
-      if (null == polylinePoints) {
-        continue
-      }
-      const boundaryType = object.boundary_type;
-      let toPushBarriers = [];
-      toPushBarriers.boundaryType = boundaryType;
-      switch (boundaryType) {
-        case "barrier":
+    switch (objectGroup.getGroupName()) {
+      case "PlayerStartingPos":
+        for (let j = 0; j < allObjects.length; ++j) {
+          const cccMaskedX = allObjects[j].x,
+            cccMaskedY = allObjects[j].y;
+          const origX = cccMaskedX,
+            origY = withTiledMapNode.getContentSize().height - cccMaskedY; // FIXME: I don't know why CocosCreator did this, it's stupid and MIGHT NOT WORK IN ISOMETRIC orientation!   
+          let wpos = this.continuousObjLayerOffsetToContinuousMapNodePos(withTiledMapNode, cc.v2(origX, origY));
+          toRet.playerStartingPositions.push(wpos);
+        }
+        break;
+      case "Barrier":
+        for (let j = 0; j < allObjects.length; ++j) {
+          let object = allObjects[j];
+          let gid = object.gid;
+          if (0 < gid) {
+            continue;
+          }
+          const boundaryType = object.boundary_type;
+          let toPushBarrier = [];
+          toPushBarrier.boundaryType = boundaryType;
+          let polylinePoints = object.polylinePoints;
+          if (null == polylinePoints) {
+            polylinePoints = [{
+              x: 0,
+              y: 0
+            }, {
+              x: object.width,
+              y: 0
+            }, {
+              x: object.width,
+              y: -object.height
+            }, {
+              x: 0,
+              y: -object.height
+            }];
+          }
          for (let k = 0; k < polylinePoints.length; ++k) {
            /* Since CocosCreatorv2.1.3, the Y-coord of object polylines is inverted compared to that of the tmx file. */
-            toPushBarriers.push(this.continuousObjLayerVecToContinuousMapNodeVec(withTiledMapNode, cc.v2(polylinePoints[k].x, -polylinePoints[k].y)));
+            toPushBarrier.push(this.continuousObjLayerVecToContinuousMapNodeVec(withTiledMapNode, cc.v2(polylinePoints[k].x, -polylinePoints[k].y)));
          }
-          toPushBarriers.anchor = this.continuousObjLayerOffsetToContinuousMapNodePos(withTiledMapNode, object.offset); // DON'T use "(object.x, object.y)" which are wrong/meaningless! 
-          toRet.barriers.push(toPushBarriers);
-          break;
-        default:
-          break;
-      }
+          toPushBarrier.anchor = this.continuousObjLayerOffsetToContinuousMapNodePos(withTiledMapNode, object.offset); // DON'T use "(object.x, object.y)" which are wrong/meaningless! 
+          toRet.barriers.push(toPushBarrier);
+        }
+        break;
    }
  }

--- a/frontend/assets/scripts/TouchEventsManager.js
+++ b/frontend/assets/scripts/TouchEventsManager.js
@@ -88,6 +88,14 @@ cc.Class({
      default: 0.0375,
      type: cc.Float
    },
+    btnA: {
+      default: null,
+      type: cc.Node
+    },
+    btnB: {
+      default: null,
+      type: cc.Node
+    },
  },

  start() {},
@@ -99,6 +107,7 @@ cc.Class({
    this.cachedBtnLeftLevel = 0;
    this.cachedBtnRightLevel = 0;
    this.cachedBtnALevel = 0;
+    this.cachedBtnBLevel = 0;

    this.canvasNode = this.mapNode.parent;
    this.mainCameraNode = this.canvasNode.getChildByName("Main Camera"); // Cannot drag and assign the `mainCameraNode` from CocosCreator EDITOR directly, otherwise it'll cause an infinite loading time, till v2.1.0.
@@ -136,6 +145,7 @@ cc.Class({
    });
    translationListenerNode.inTouchPoints = new Map();

+    /*
    zoomingListenerNode.on(cc.Node.EventType.TOUCH_START, function(event) {
      self._touchStartEvent(event);
    });
@@ -149,6 +159,37 @@ cc.Class({
      self._touchEndEvent(event);
    });
    zoomingListenerNode.inTouchPoints = new Map();
+    */
+
+    if (self.btnA) {
+      self.btnA.on(cc.Node.EventType.TOUCH_START, function(evt) {
+        self.cachedBtnALevel = 1;
+        evt.target.runAction(cc.scaleTo(0.1, 0.3));
+      });
+      self.btnA.on(cc.Node.EventType.TOUCH_END, function(evt) {
+        self.cachedBtnALevel = 0;
+        evt.target.runAction(cc.scaleTo(0.1, 1.0));
+      });
+      self.btnA.on(cc.Node.EventType.TOUCH_CANCEL, function(evt) {
+        self.cachedBtnALevel = 0;
+        evt.target.runAction(cc.scaleTo(0.1, 1.0));
+      });
+    }
+
+    if (self.btnB) {
+      self.btnB.on(cc.Node.EventType.TOUCH_START, function(evt) {
+        self.cachedBtnBLevel = 1;
+        evt.target.runAction(cc.scaleTo(0.1, 0.3));
+      });
+      self.btnB.on(cc.Node.EventType.TOUCH_END, function(evt) {
+        self.cachedBtnBLevel = 0;
+        evt.target.runAction(cc.scaleTo(0.1, 1.0));
+      });
+      self.btnB.on(cc.Node.EventType.TOUCH_CANCEL, function(evt) {
+        self.cachedBtnBLevel = 0;
+        evt.target.runAction(cc.scaleTo(0.1, 1.0));
+      });
+    }

    // Setup keyboard controls for the ease of attach debugging
    cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, function(evt) {
@@ -168,6 +209,9 @@ cc.Class({
        case cc.macro.KEY.h:
          self.cachedBtnALevel = 1;
          break;
+        case cc.macro.KEY.j:
+          self.cachedBtnBLevel = 1;
+          break;
        default:
          break;
      }
@@ -190,6 +234,9 @@ cc.Class({
        case cc.macro.KEY.h:
          self.cachedBtnALevel = 0;
          break;
+        case cc.macro.KEY.j:
+          self.cachedBtnBLevel = 0;
+          break;
        default:
          break;
      }
@@ -400,7 +447,8 @@ cc.Class({
  getEncodedInput() {
    const discretizedDir = this.discretizeDirection(this.stickhead.x, this.stickhead.y, this.joyStickEps).encodedIdx; // There're only 9 dirs, thus using only the lower 4-bits
    const btnALevel = (this.cachedBtnALevel << 4);
-    return (btnALevel + discretizedDir);
+    const btnBLevel = (this.cachedBtnBLevel << 5);
+    return (btnBLevel + btnALevel + discretizedDir);
  },

  decodeInput(encodedInput) {
@@ -410,10 +458,12 @@ cc.Class({
      console.error("Unexpected encodedDirection = ", encodedDirection);
    }
    const btnALevel = ((encodedInput >> 4) & 1);
+    const btnBLevel = ((encodedInput >> 5) & 1);
    return window.pb.protos.InputFrameDecoded.create({
      dx: mappedDirection[0],
      dy: mappedDirection[1],
      btnALevel: btnALevel,
+      btnBLevel: btnBLevel,
    });
  },
 });
--- a/frontend/assets/scripts/WsSessionMgr.js
+++ b/frontend/assets/scripts/WsSessionMgr.js
@@ -12,7 +12,6 @@ window.DOWNSYNC_MSG_ACT_INPUT_BATCH = 2;
 window.DOWNSYNC_MSG_ACT_BATTLE_STOPPED = 3;
 window.DOWNSYNC_MSG_ACT_FORCED_RESYNC = 4;

-
 window.sendSafely = function(msgStr) {
  /**
  * - "If the data can't be sent (for example, because it needs to be buffered but the buffer is full), the socket is closed automatically."
@@ -28,10 +27,13 @@ window.sendUint8AsBase64Safely = function(msgUint8Arr) {
  window.clientSession.send(_uint8ToBase64(msgUint8Arr));
 }

-window.closeWSConnection = function() {
-  if (null == window.clientSession || window.clientSession.readyState != WebSocket.OPEN) return;
+window.closeWSConnection = function(code, reason) {
+  if (null == window.clientSession || window.clientSession.readyState != WebSocket.OPEN) {
+    console.log(`"window.clientSession" is already closed or destroyed.`);
+    return;
+  }
  console.log(`Closing "window.clientSession" from the client-side.`);
-  window.clientSession.close();
+  window.clientSession.close(code, reason);
 }

 window.getBoundRoomIdFromPersistentStorage = function() {
@@ -144,9 +146,10 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
    if (null == evt || null == evt.data) {
      return;
    }
+    // FIXME: In practice, it seems like the thread invoking "onmessage" could be different from "Map.update(dt)", which makes it necessary to guard "recentRenderCache & recentInputCache" for "getOrPrefabInputFrameUpsync & rollbackAndChase & onRoomDownsyncFrame & onInputFrameDownsyncBatch" to avoid mysterious RAM contamination, but there's no explicit mutex in JavaScript for browsers -- this issue is found in Firefox (108.0.1, 64-bit, Windows 11), but not in Chrome (108.0.5359.125, Official Build, 64-bit, Windows 11) -- just breakpoint in "Map.rollbackAndChase" then see whether the logs of "onmessage" can still be printed and whether the values of "recentRenderCache & recentInputCache" change in console). 
    try {
      const resp = window.pb.protos.WsResp.decode(new Uint8Array(evt.data));
-      // console.log(`Got non-empty onmessage decoded: resp.act=${resp.act}`);
+      //console.log(`Got non-empty onmessage decoded: resp.act=${resp.act}`);
      switch (resp.act) {
        case window.DOWNSYNC_MSG_ACT_HB_REQ:
          window.handleHbRequirements(resp);
@@ -183,39 +186,41 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {

  clientSession.onerror = function(evt) {
    console.error("Error caught on the WS clientSession: ", evt);
-    if (window.handleClientSessionError) {
-      window.handleClientSessionError();
-    }
+    window.clearLocalStorageAndBackToLoginScene(true);
  };

  clientSession.onclose = function(evt) {
    // [WARNING] The callback "onclose" might be called AFTER the webpage is refreshed with "1001 == evt.code".
-    console.warn("The WS clientSession is closed: ", evt, clientSession);
-    if (false == evt.wasClean) {
-      /*
-      Chrome doesn't allow the use of "CustomCloseCode"s (yet) and will callback with a "WebsocketStdCloseCode 1006" and "false == evt.wasClean" here. See https://tools.ietf.org/html/rfc6455#section-7.4 for more information.
-      */
-      if (window.handleClientSessionError) {
-        window.handleClientSessionError();
-      }
-    } else {
-      switch (evt.code) {
-        case constants.RET_CODE.PLAYER_NOT_ADDABLE_TO_ROOM:
-        case constants.RET_CODE.PLAYER_NOT_READDABLE_TO_ROOM:
-          window.clearBoundRoomIdInBothVolatileAndPersistentStorage();
-          break;
-        case constants.RET_CODE.UNKNOWN_ERROR:
-        case constants.RET_CODE.MYSQL_ERROR:
-        case constants.RET_CODE.PLAYER_NOT_FOUND:
-        case constants.RET_CODE.PLAYER_CHEATING:
-        case 1006: // Peer(i.e. the backend) gone unexpectedly 
-          if (window.handleClientSessionError) {
-            window.handleClientSessionError();
-          }
-          break;
-        default:
-          break;
-      }
+    console.warn(`The WS clientSession is closed: evt=${JSON.stringify(evt)}, evt.code=${evt.code}`);
+    switch (evt.code) {
+      case constants.RET_CODE.CLIENT_MISMATCHED_RENDER_FRAME:
+        break;
+      case constants.RET_CODE.BATTLE_STOPPED:
+        // deliberately do nothing
+        if (mapIns.frameDataLoggingEnabled) {
+          console.warn(`${mapIns._stringifyRdfIdToActuallyUsedInput()}`);
+        }
+        break;
+      case constants.RET_CODE.PLAYER_NOT_ADDABLE_TO_ROOM:
+      case constants.RET_CODE.PLAYER_NOT_READDABLE_TO_ROOM:
+        window.clearBoundRoomIdInBothVolatileAndPersistentStorage(); // To favor the player to join other rooms
+        mapIns.onManualRejoinRequired("Couldn't join any room at the moment, please retry");
+        break;
+      case constants.RET_CODE.ACTIVE_WATCHDOG:
+        mapIns.onManualRejoinRequired("Disconnected due to long-time inactivity, please rejoin");
+        break;
+      case constants.RET_CODE.UNKNOWN_ERROR:
+      case constants.RET_CODE.MYSQL_ERROR:
+      case constants.RET_CODE.PLAYER_NOT_FOUND:
+      case constants.RET_CODE.PLAYER_CHEATING:
+      case 1006: // Peer(i.e. the backend) gone unexpectedly 
+        if (mapIns.frameDataLoggingEnabled) {
+          console.warn(`${mapIns._stringifyRdfIdToActuallyUsedInput()}`);
+        }
+        window.clearLocalStorageAndBackToLoginScene(true);
+        break;
+      default:
+        break;
    }
  };
 };
@@ -226,19 +231,7 @@ window.clearLocalStorageAndBackToLoginScene = function(shouldRetainBoundRoomIdIn
  if (window.mapIns && window.mapIns.musicEffectManagerScriptIns) {
    window.mapIns.musicEffectManagerScriptIns.stopAllMusic();
  }
-  /**
-   * Here I deliberately removed the callback in the "common `handleClientSessionError` callback"
-   * within which another invocation to `clearLocalStorageAndBackToLoginScene` will be made.
-   *
-   * It'll be re-assigned to the common one upon reentrance of `Map.onLoad`.
-   *
-   * -- YFLu 2019-04-06
-   */
-  window.handleClientSessionError = () => {
-    console.warn("+++++++ Special handleClientSessionError() assigned within `clearLocalStorageAndBackToLoginScene`");
-    // TBD.
-    window.handleClientSessionError = null; // To ensure that it's called at most once. 
-  };
+
  window.closeWSConnection();
  window.clearSelfPlayer();
  if (true != shouldRetainBoundRoomIdInBothVolatileAndPersistentStorage) {
--- a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
+++ b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
--- a/frontend/collision_test_nodejs.js
+++ b/frontend/collision_test_nodejs.js
@@ -11,24 +11,28 @@ function polygonStr(body) {
  return JSON.stringify(coords);
 }

-const playerCollider = collisionSys.createPolygon(1269.665, 1353.335, [[0, 0], [64, 0], [64, 64], [0, 64]]);
+const playerCollider1 = collisionSys.createPolygon(944.000, 676.000, [[0, 0], [24, 0], [24, 48], [0, 48]]);
+playerCollider1.data = {isPlayer: true};
+const playerCollider2 = collisionSys.createPolygon(958.000, 724.000, [[0, 0], [24, 0], [24, 48], [0, 48]]);
+playerCollider2.data = {isPlayer: true};

 const barrierCollider1 = collisionSys.createPolygon(1277.7159000000001, 1570.5575, [[642.5696, 319.159], [0, 319.15680000000003], [5.7286, 0], [643.7451, 0.9014999999999986]]);
 const barrierCollider2 = collisionSys.createPolygon(1289.039, 1318.0805, [[628.626, 54.254500000000064], [0, 56.03250000000003], [0.42449999999999477, 1.1229999999999905], [625.9715000000001, 0]]);
 const barrierCollider3 = collisionSys.createPolygon(1207, 1310, [[69, 581], [0, 579], [8, 3], [79, 0]]);

-playerCollider.x += -2.98;
-playerCollider.y += -50.0;
 collisionSys.update();

 const effPushback = [0.0, 0.0];

 const result = collisionSys.createResult();

-const potentials = playerCollider.potentials();
-
-for (const barrier of potentials) {
-  if (!playerCollider.collides(barrier, result)) continue;
+// Check collision for player1
+const potentials = playerCollider1.potentials();
+for (const potential of potentials) {
+  if (null == potential.data || true != potential.data.isPlayer) continue;
+  console.log(`Collided player potential of a=${polygonStr(playerCollider1)}: b=${polygonStr(potential)}`);
+  if (!playerCollider1.collides(potential, result)) continue;
+  console.log(`Collided player of a=${polygonStr(playerCollider1)}: b=${polygonStr(potential)}`);
  const pushbackX = result.overlap * result.overlap_x; 
  const pushbackY = result.overlap * result.overlap_y; 
  console.log(`Overlapped: a=${polygonStr(result.a)}, b=${polygonStr(result.b)}, pushbackX=${pushbackX}, pushbackY=${pushbackY}`);
--- a/frontend/settings/builder.json
+++ b/frontend/settings/builder.json
@@ -17,13 +17,13 @@
  },
  "encryptJs": true,
  "excludeScenes": [
-    "475b849b-44b3-4390-982d-bd0d9e695093"
+    "8491a86c-bec9-4813-968a-128ca01639e0"
  ],
  "fb-instant-games": {},
  "includeSDKBox": false,
  "inlineSpriteFrames": true,
  "inlineSpriteFrames_native": true,
-  "md5Cache": true,
+  "md5Cache": false,
  "mergeStartScene": true,
  "optimizeHotUpdate": false,
  "orientation": {
--- a/frontend/settings/project.json
+++ b/frontend/settings/project.json
@@ -34,7 +34,6 @@
  "design-resolution-width": 960,
  "excluded-modules": [
    "Collider",
-    "DragonBones",
    "Geom Utils",
    "Mesh",
    "MotionStreak",
@@ -69,7 +68,7 @@
    "shelter_z_reducer",
    "shelter"
  ],
-  "last-module-event-record-time": 1579766511782,
+  "last-module-event-record-time": 1672287736326,
  "simulator-orientation": false,
  "simulator-resolution": {
    "height": 640,
--- a/jsexport/Makefile
+++ b/jsexport/Makefile
@@ -0,0 +1,28 @@
+PROJECTNAME=jsexport
+ROOT_DIR=.
+all: help
+## Available proxies for downloading go modules are listed in "https://github.com/golang/go/wiki/Modules#how-do-i-use-vendoring-with-modules-is-vendoring-going-away". 
+#GOPROXY=https://mirrors.aliyun.com/goproxy 
+GOPROXY=https://goproxy.io
+
+serve:
+	gopherjs clean
+	gopherjs serve $(PROJECTNAME)
+
+build:
+	gopherjs build $(PROJECTNAME)
+	rm ../frontend/assets/plugin_scripts/jsexport.js && mv ./jsexport.js ../frontend/assets/plugin_scripts/jsexport.js
+
+build-min:
+	gopherjs build -m $(PROJECTNAME)
+	rm ../frontend/assets/plugin_scripts/jsexport.js && mv ./jsexport.js ../frontend/assets/plugin_scripts/jsexport.js
+
+.PHONY: help
+
+help: Makefile
+	@echo
+	@echo " Choose a command run:"
+	@echo
+	@sed -n 's/^##//p' $< | column -t -s ':' |  sed -e 's/^/ /'
+	@echo
+ 
--- a/jsexport/README.md
+++ b/jsexport/README.md
@@ -0,0 +1,7 @@
+GopherJs is supposed to be run by `go run`. 
+
+If on-the-fly compilation is needed, run `gopherjs serve jsexport` and then visit `http://localhost:8080/jsexport.js` -- if 404 not found is responded, run `gopherjs build` to check syntax errors.
+
+See the `Makefile` for more options.
+
+Kindly note that the sources of the greate opensource projects [resolv](https://github.com/SolarLune/resolv) and [vector](https://github.com/quartercastle/vector) are copied and modified here to reduce the size of generated js codes, i.e. standard libs `fmt`, `error`, `pb`(including standard libs `sync` and `reflect`) are deliberately avoided from scratch. 
--- a/jsexport/battle/battle.go
+++ b/jsexport/battle/battle.go
@@ -0,0 +1,713 @@
+package battle
+
+import (
+	"math"
+	"resolv"
+)
+
+const (
+	MAX_FLOAT64                    = 1.7e+308
+	COLLISION_PLAYER_INDEX_PREFIX  = (1 << 17)
+	COLLISION_BARRIER_INDEX_PREFIX = (1 << 16)
+	COLLISION_BULLET_INDEX_PREFIX  = (1 << 15)
+
+	PATTERN_ID_UNABLE_TO_OP = -2
+	PATTERN_ID_NO_OP        = -1
+)
+
+// These directions are chosen such that when speed is changed to "(speedX+delta, speedY+delta)" for any of them, the direction is unchanged.
+var DIRECTION_DECODER = [][]int32{
+	{0, 0},
+	{0, +2},
+	{0, -2},
+	{+2, 0},
+	{-2, 0},
+	{+1, +1},
+	{-1, -1},
+	{+1, -1},
+	{-1, +1},
+}
+
+var skillIdToBullet = map[int]interface{}{
+	1: &MeleeBullet{
+		Bullet: Bullet{
+			// for offender
+			StartupFrames:         int32(5),
+			ActiveFrames:          int32(10),
+			RecoveryFrames:        int32(34),
+			RecoveryFramesOnBlock: int32(34),
+			RecoveryFramesOnHit:   int32(34),
+			HitboxOffset:          float64(12.0), // should be about the radius of the PlayerCollider
+
+			// for defender
+			HitStunFrames:      int32(18),
+			BlockStunFrames:    int32(9),
+			Pushback:           float64(8.0),
+			ReleaseTriggerType: int32(1), // 1: rising-edge, 2: falling-edge
+			Damage:             int32(5),
+
+			SelfMoveforwardX: 0,
+			SelfMoveforwardY: 0,
+			HitboxSizeX:      24.0,
+			HitboxSizeY:      32.0,
+		},
+	},
+}
+
+const (
+	ATK_CHARACTER_STATE_IDLE1        = int32(0)
+	ATK_CHARACTER_STATE_WALKING      = int32(1)
+	ATK_CHARACTER_STATE_ATK1         = int32(2)
+	ATK_CHARACTER_STATE_ATKED1       = int32(3)
+	ATK_CHARACTER_STATE_INAIR_IDLE1  = int32(4)
+	ATK_CHARACTER_STATE_INAIR_ATK1   = int32(5)
+	ATK_CHARACTER_STATE_INAIR_ATKED1 = int32(6)
+)
+
+func ConvertToInputFrameId(renderFrameId int32, inputDelayFrames int32, inputScaleFrames uint32) int32 {
+	if renderFrameId < inputDelayFrames {
+		return 0
+	}
+	return ((renderFrameId - inputDelayFrames) >> inputScaleFrames)
+}
+
+func decodeInput(encodedInput uint64) *InputFrameDecoded {
+	encodedDirection := (encodedInput & uint64(15))
+	btnALevel := int32((encodedInput >> 4) & 1)
+	btnBLevel := int32((encodedInput >> 5) & 1)
+	return &InputFrameDecoded{
+		Dx:        DIRECTION_DECODER[encodedDirection][0],
+		Dy:        DIRECTION_DECODER[encodedDirection][1],
+		BtnALevel: btnALevel,
+		BtnBLevel: btnBLevel,
+	}
+}
+
+type SatResult struct {
+	Overlap       float64
+	OverlapX      float64
+	OverlapY      float64
+	AContainedInB bool
+	BContainedInA bool
+	Axis          resolv.Vector
+}
+
+func CalcPushbacks(oldDx, oldDy float64, playerShape, barrierShape *resolv.ConvexPolygon) (bool, float64, float64, *SatResult) {
+	origX, origY := playerShape.Position()
+	defer func() {
+		playerShape.SetPosition(origX, origY)
+	}()
+	playerShape.SetPosition(origX+oldDx, origY+oldDy)
+
+	overlapResult := &SatResult{
+		Overlap:       0,
+		OverlapX:      0,
+		OverlapY:      0,
+		AContainedInB: true,
+		BContainedInA: true,
+		Axis:          resolv.Vector{0, 0},
+	}
+	if overlapped := isPolygonPairOverlapped(playerShape, barrierShape, overlapResult); overlapped {
+		pushbackX, pushbackY := overlapResult.Overlap*overlapResult.OverlapX, overlapResult.Overlap*overlapResult.OverlapY
+		return true, pushbackX, pushbackY, overlapResult
+	} else {
+		return false, 0, 0, overlapResult
+	}
+}
+
+func isPolygonPairOverlapped(a, b *resolv.ConvexPolygon, result *SatResult) bool {
+	aCnt, bCnt := len(a.Points), len(b.Points)
+	// Single point case
+	if 1 == aCnt && 1 == bCnt {
+		if nil != result {
+			result.Overlap = 0
+		}
+		return a.Points[0][0] == b.Points[0][0] && a.Points[0][1] == b.Points[0][1]
+	}
+
+	if 1 < aCnt {
+		for _, axis := range a.SATAxes() {
+			if isPolygonPairSeparatedByDir(a, b, axis.Unit(), result) {
+				return false
+			}
+		}
+	}
+
+	if 1 < bCnt {
+		for _, axis := range b.SATAxes() {
+			if isPolygonPairSeparatedByDir(a, b, axis.Unit(), result) {
+				return false
+			}
+		}
+	}
+
+	return true
+}
+
+func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e resolv.Vector, result *SatResult) bool {
+	/*
+		[WARNING] This function is deliberately made private, it shouldn't be used alone (i.e. not along the norms of a polygon), otherwise the pushbacks calculated would be meaningless.
+
+		Consider the following example
+		a: {
+			anchor: [1337.19 1696.74]
+			points: [[0 0] [24 0] [24 24] [0 24]]
+		},
+		b: {
+			anchor: [1277.72 1570.56]
+			points: [[642.57 319.16] [0 319.16] [5.73 0] [643.75 0.90]]
+		}
+
+		e = (-2.98, 1.49).Unit()
+	*/
+
+	var aStart, aEnd, bStart, bEnd float64 = MAX_FLOAT64, -MAX_FLOAT64, MAX_FLOAT64, -MAX_FLOAT64
+	for _, p := range a.Points {
+		dot := (p[0]+a.X)*e[0] + (p[1]+a.Y)*e[1]
+
+		if aStart > dot {
+			aStart = dot
+		}
+
+		if aEnd < dot {
+			aEnd = dot
+		}
+	}
+
+	for _, p := range b.Points {
+		dot := (p[0]+b.X)*e[0] + (p[1]+b.Y)*e[1]
+
+		if bStart > dot {
+			bStart = dot
+		}
+
+		if bEnd < dot {
+			bEnd = dot
+		}
+	}
+
+	if aStart > bEnd || aEnd < bStart {
+		// Separated by unit vector "e"
+		return true
+	}
+
+	if nil != result {
+		overlap := float64(0)
+
+		if aStart < bStart {
+			result.AContainedInB = false
+
+			if aEnd < bEnd {
+				overlap = aEnd - bStart
+				result.BContainedInA = false
+			} else {
+				option1 := aEnd - bStart
+				option2 := bEnd - aStart
+				if option1 < option2 {
+					overlap = option1
+				} else {
+					overlap = -option2
+				}
+			}
+		} else {
+			result.BContainedInA = false
+
+			if aEnd > bEnd {
+				overlap = aStart - bEnd
+				result.AContainedInB = false
+			} else {
+				option1 := aEnd - bStart
+				option2 := bEnd - aStart
+				if option1 < option2 {
+					overlap = option1
+				} else {
+					overlap = -option2
+				}
+			}
+		}
+
+		currentOverlap := result.Overlap
+		absoluteOverlap := overlap
+		if overlap < 0 {
+			absoluteOverlap = -overlap
+		}
+
+		if (0 == result.Axis[0] && 0 == result.Axis[1]) || currentOverlap > absoluteOverlap {
+			var sign float64 = 1
+			if overlap < 0 {
+				sign = -1
+			}
+
+			result.Overlap = absoluteOverlap
+			result.OverlapX = e[0] * sign
+			result.OverlapY = e[1] * sign
+		}
+
+		result.Axis = e
+	}
+
+	// the specified unit vector "e" doesn't separate "a" and "b", overlap result is generated
+	return false
+}
+
+func WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio float64) (int32, int32) {
+	// [WARNING] Introduces loss of precision!
+	// In JavaScript floating numbers suffer from seemingly non-deterministic arithmetics, and even if certain libs solved this issue by approaches such as fixed-point-number, they might not be used in other libs -- e.g. the "collision libs" we're interested in -- thus couldn't kill all pains.
+	var virtualGridX int32 = int32(math.Floor(wx * worldToVirtualGridRatio))
+	var virtualGridY int32 = int32(math.Floor(wy * worldToVirtualGridRatio))
+	return virtualGridX, virtualGridY
+}
+
+func VirtualGridToWorldPos(vx, vy int32, virtualGridToWorldRatio float64) (float64, float64) {
+	// No loss of precision
+	var wx float64 = float64(vx) * virtualGridToWorldRatio
+	var wy float64 = float64(vy) * virtualGridToWorldRatio
+	return wx, wy
+}
+
+func WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+	return wx - halfBoundingW - leftPadding + collisionSpaceOffsetX, wy - halfBoundingH - bottomPadding + collisionSpaceOffsetY
+}
+
+func PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+	return cx + halfBoundingW + leftPadding - collisionSpaceOffsetX, cy + halfBoundingH + bottomPadding - collisionSpaceOffsetY
+}
+
+func PolygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
+	wx, wy := PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
+	return WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio)
+}
+
+func VirtualGridToPolygonColliderBLPos(vx, vy int32, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
+	wx, wy := VirtualGridToWorldPos(vx, vy, virtualGridToWorldRatio)
+	return WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
+}
+
+func calcHardPushbacksNorms(joinIndex int32, playerCollider *resolv.Object, playerShape *resolv.ConvexPolygon, snapIntoPlatformOverlap float64, pEffPushback *Vec2D) *[]Vec2D {
+	ret := make([]Vec2D, 0, 10) // no one would simultaneously have more than 5 hardPushbacks
+	collision := playerCollider.Check(0, 0)
+	if nil == collision {
+		return &ret
+	}
+
+	//playerColliderCenterX, playerColliderCenterY := playerCollider.Center()
+	//fmt.Printf("joinIndex=%d calcHardPushbacksNorms has non-empty collision;playerColliderPos=(%.2f,%.2f)\n", joinIndex, playerColliderCenterX, playerColliderCenterY)
+	for _, obj := range collision.Objects {
+		isBarrier := false
+		switch obj.Data.(type) {
+		case *PlayerDownsync:
+		case *MeleeBullet:
+		default:
+			// By default it's a regular barrier, even if data is nil, note that Golang syntax of switch-case is kind of confusing, this "default" condition is met only if "!*PlayerDownsync && !*MeleeBullet".
+			isBarrier = true
+		}
+
+		if !isBarrier {
+			continue
+		}
+		barrierShape := obj.Shape.(*resolv.ConvexPolygon)
+		overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, barrierShape)
+		if !overlapped {
+			continue
+		}
+		// ALWAY snap into hardPushbacks!
+		// [OverlapX, OverlapY] is the unit vector that points into the platform
+		pushbackX, pushbackY = (overlapResult.Overlap-snapIntoPlatformOverlap)*overlapResult.OverlapX, (overlapResult.Overlap-snapIntoPlatformOverlap)*overlapResult.OverlapY
+		ret = append(ret, Vec2D{X: overlapResult.OverlapX, Y: overlapResult.OverlapY})
+		pEffPushback.X += pushbackX
+		pEffPushback.Y += pushbackY
+		//fmt.Printf("joinIndex=%d calcHardPushbacksNorms found one hardpushback; immediatePushback=(%.2f,%.2f)\n", joinIndex, pushbackX, pushbackY)
+	}
+	return &ret
+}
+
+func deriveOpPattern(currPlayerDownsync, thatPlayerInNextFrame *PlayerDownsync, currRenderFrame *RoomDownsyncFrame, inputsBuffer *RingBuffer, inputDelayFrames int32, inputScaleFrames uint32) (int, bool, int32, int32) {
+	// returns (patternId, jumpedOrNot, effectiveDx, effectiveDy)
+	delayedInputFrameId := ConvertToInputFrameId(currRenderFrame.Id, inputDelayFrames, inputScaleFrames)
+	delayedInputFrameIdForPrevRdf := ConvertToInputFrameId(currRenderFrame.Id-1, inputDelayFrames, inputScaleFrames)
+
+	if 0 >= delayedInputFrameId {
+		return PATTERN_ID_UNABLE_TO_OP, false, 0, 0
+	}
+
+	delayedInputList := inputsBuffer.GetByFrameId(delayedInputFrameId).(*InputFrameDownsync).InputList
+	var delayedInputListForPrevRdf []uint64 = nil
+	if 0 < delayedInputFrameIdForPrevRdf {
+		delayedInputListForPrevRdf = inputsBuffer.GetByFrameId(delayedInputFrameIdForPrevRdf).(*InputFrameDownsync).InputList
+	}
+
+	jumpedOrNot := false
+	joinIndex := currPlayerDownsync.JoinIndex
+	if 0 < currPlayerDownsync.FramesToRecover {
+		return PATTERN_ID_UNABLE_TO_OP, false, 0, 0
+	}
+	decodedInput := decodeInput(delayedInputList[joinIndex-1])
+	effDx, effDy := decodedInput.Dx, decodedInput.Dy
+	prevBtnALevel, prevBtnBLevel := int32(0), int32(0)
+	if nil != delayedInputListForPrevRdf {
+		prevDecodedInput := decodeInput(delayedInputListForPrevRdf[joinIndex-1])
+		prevBtnALevel = prevDecodedInput.BtnALevel
+		prevBtnBLevel = prevDecodedInput.BtnBLevel
+	}
+
+	if decodedInput.BtnBLevel > prevBtnBLevel {
+		characStateAlreadyInAir := false
+		if ATK_CHARACTER_STATE_INAIR_IDLE1 == currPlayerDownsync.CharacterState || ATK_CHARACTER_STATE_INAIR_ATK1 == currPlayerDownsync.CharacterState || ATK_CHARACTER_STATE_INAIR_ATKED1 == currPlayerDownsync.CharacterState {
+			characStateAlreadyInAir = true
+		}
+		characStateIsInterruptWaivable := false
+		if ATK_CHARACTER_STATE_IDLE1 == currPlayerDownsync.CharacterState || ATK_CHARACTER_STATE_WALKING == currPlayerDownsync.CharacterState || ATK_CHARACTER_STATE_INAIR_IDLE1 == currPlayerDownsync.CharacterState {
+			characStateIsInterruptWaivable = true
+		}
+		if !characStateAlreadyInAir && characStateIsInterruptWaivable {
+			jumpedOrNot = true
+		}
+	}
+
+	patternId := PATTERN_ID_NO_OP
+	if decodedInput.BtnALevel > prevBtnALevel {
+		patternId = 0
+		effDx, effDy = 0, 0 // Most patterns/skills should not allow simultaneous movement
+	}
+
+	return patternId, jumpedOrNot, effDx, effDy
+}
+
+// [WARNING] The params of this method is carefully tuned such that only "battle.RoomDownsyncFrame" is a necessary custom struct.
+func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer *RingBuffer, currRenderFrame *RoomDownsyncFrame, collisionSys *resolv.Space, collisionSysMap map[int32]*resolv.Object, gravityX, gravityY, jumpingInitVelY, inputDelayFrames int32, inputScaleFrames uint32, collisionSpaceOffsetX, collisionSpaceOffsetY, snapIntoPlatformOverlap, snapIntoPlatformThreshold, worldToVirtualGridRatio, virtualGridToWorldRatio float64, playerOpPatternToSkillId map[int]int) *RoomDownsyncFrame {
+	// [WARNING] On backend this function MUST BE called while "InputsBufferLock" is locked!
+	roomCapacity := len(currRenderFrame.PlayersArr)
+	nextRenderFramePlayers := make([]*PlayerDownsync, roomCapacity)
+	// Make a copy first
+	for i, currPlayerDownsync := range currRenderFrame.PlayersArr {
+		nextRenderFramePlayers[i] = &PlayerDownsync{
+			Id:              currPlayerDownsync.Id,
+			VirtualGridX:    currPlayerDownsync.VirtualGridX,
+			VirtualGridY:    currPlayerDownsync.VirtualGridY,
+			DirX:            currPlayerDownsync.DirX,
+			DirY:            currPlayerDownsync.DirY,
+			VelX:            currPlayerDownsync.VelX,
+			VelY:            currPlayerDownsync.VelY,
+			CharacterState:  currPlayerDownsync.CharacterState,
+			InAir:           true,
+			Speed:           currPlayerDownsync.Speed,
+			BattleState:     currPlayerDownsync.BattleState,
+			Score:           currPlayerDownsync.Score,
+			Removed:         currPlayerDownsync.Removed,
+			JoinIndex:       currPlayerDownsync.JoinIndex,
+			FramesToRecover: currPlayerDownsync.FramesToRecover - 1,
+			Hp:              currPlayerDownsync.Hp,
+			MaxHp:           currPlayerDownsync.MaxHp,
+		}
+		if nextRenderFramePlayers[i].FramesToRecover < 0 {
+			nextRenderFramePlayers[i].FramesToRecover = 0
+		}
+	}
+
+	nextRenderFrameMeleeBullets := make([]*MeleeBullet, 0, len(currRenderFrame.MeleeBullets)) // Is there any better way to reduce malloc/free impact, e.g. smart prediction for fixed memory allocation?
+	effPushbacks := make([]Vec2D, roomCapacity)
+	hardPushbackNorms := make([]*[]Vec2D, roomCapacity)
+
+	// 1. Process player inputs
+	for i, currPlayerDownsync := range currRenderFrame.PlayersArr {
+		thatPlayerInNextFrame := nextRenderFramePlayers[i]
+		patternId, jumpedOrNot, effDx, effDy := deriveOpPattern(currPlayerDownsync, thatPlayerInNextFrame, currRenderFrame, inputsBuffer, inputDelayFrames, inputScaleFrames)
+		if PATTERN_ID_UNABLE_TO_OP == patternId {
+			continue
+		}
+
+		if jumpedOrNot {
+			thatPlayerInNextFrame.VelY = jumpingInitVelY
+			thatPlayerInNextFrame.VirtualGridY += jumpingInitVelY // Immediately gets out of any snapping
+		}
+		joinIndex := currPlayerDownsync.JoinIndex
+		if PATTERN_ID_NO_OP != patternId {
+			if skillId, existent := playerOpPatternToSkillId[(int(joinIndex)<<uint(8))+patternId]; existent {
+				skillConfig := skillIdToBullet[skillId].(*MeleeBullet) // Hardcoded type "MeleeBullet" for now
+				var newMeleeBullet MeleeBullet = *skillConfig
+				newMeleeBullet.OffenderJoinIndex = joinIndex
+				newMeleeBullet.OffenderPlayerId = currPlayerDownsync.Id
+				newMeleeBullet.OriginatedRenderFrameId = currRenderFrame.Id
+				nextRenderFrameMeleeBullets = append(nextRenderFrameMeleeBullets, &newMeleeBullet)
+				thatPlayerInNextFrame.FramesToRecover = newMeleeBullet.RecoveryFrames
+				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_ATK1
+				if false == currPlayerDownsync.InAir {
+					thatPlayerInNextFrame.VelX = 0
+				}
+			}
+			continue
+		}
+
+		if 0 != effDx || 0 != effDy {
+			thatPlayerInNextFrame.DirX, thatPlayerInNextFrame.DirY = effDx, effDy
+			thatPlayerInNextFrame.VelX = effDx * currPlayerDownsync.Speed
+			thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_WALKING
+		} else {
+			thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_IDLE1
+			thatPlayerInNextFrame.VelX = 0
+		}
+	}
+
+	// 2. Process player movement
+	for i, currPlayerDownsync := range currRenderFrame.PlayersArr {
+		joinIndex := currPlayerDownsync.JoinIndex
+		effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y = float64(0), float64(0)
+		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
+		playerCollider := collisionSysMap[collisionPlayerIndex]
+		thatPlayerInNextFrame := nextRenderFramePlayers[i]
+		// Reset playerCollider position from the "virtual grid position"
+		newVx, newVy := currPlayerDownsync.VirtualGridX+currPlayerDownsync.VelX, currPlayerDownsync.VirtualGridY+currPlayerDownsync.VelY
+
+		playerCollider.X, playerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, playerCollider.W*0.5, playerCollider.H*0.5, 0, 0, 0, 0, collisionSpaceOffsetX, collisionSpaceOffsetY, virtualGridToWorldRatio)
+		// Update in the collision system
+		playerCollider.Update()
+
+		if currPlayerDownsync.InAir {
+			thatPlayerInNextFrame.VelX += gravityX
+			thatPlayerInNextFrame.VelY += gravityY
+		}
+	}
+
+	// 3. Add bullet colliders into collision system
+	bulletColliders := make([]*resolv.Object, 0, len(currRenderFrame.MeleeBullets)) // Will all be removed at the end of this function due to the need for being rollback-compatible
+	for _, meleeBullet := range currRenderFrame.MeleeBullets {
+		if (meleeBullet.OriginatedRenderFrameId+meleeBullet.StartupFrames <= currRenderFrame.Id) && (meleeBullet.OriginatedRenderFrameId+meleeBullet.StartupFrames+meleeBullet.ActiveFrames > currRenderFrame.Id) {
+			offender := currRenderFrame.PlayersArr[meleeBullet.OffenderJoinIndex-1]
+
+			xfac := float64(1.0) // By now, straight Punch offset doesn't respect "y-axis"
+			if 0 > offender.DirX {
+				xfac = float64(-1.0)
+			}
+			offenderWx, offenderWy := VirtualGridToWorldPos(offender.VirtualGridX, offender.VirtualGridY, virtualGridToWorldRatio)
+			bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
+			newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSizeX, meleeBullet.HitboxSizeY, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, collisionSpaceOffsetX, collisionSpaceOffsetY, meleeBullet, "MeleeBullet")
+			collisionSys.Add(newBulletCollider)
+			bulletColliders = append(bulletColliders, newBulletCollider)
+		} else {
+			nextRenderFrameMeleeBullets = append(nextRenderFrameMeleeBullets, meleeBullet)
+		}
+	}
+
+	// 4. Calc pushbacks for each player (after its movement) w/o bullets
+	for i, currPlayerDownsync := range currRenderFrame.PlayersArr {
+		joinIndex := currPlayerDownsync.JoinIndex
+		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
+		playerCollider := collisionSysMap[collisionPlayerIndex]
+		playerShape := playerCollider.Shape.(*resolv.ConvexPolygon)
+		hardPushbackNorms[joinIndex-1] = calcHardPushbacksNorms(joinIndex, playerCollider, playerShape, snapIntoPlatformOverlap, &(effPushbacks[joinIndex-1]))
+		thatPlayerInNextFrame := nextRenderFramePlayers[i]
+		landedOnGravityPushback := false
+		if collision := playerCollider.Check(0, 0); nil != collision {
+			for _, obj := range collision.Objects {
+				isBarrier, isAnotherPlayer, isBullet := false, false, false
+				switch obj.Data.(type) {
+				case *PlayerDownsync:
+					isAnotherPlayer = true
+				case *MeleeBullet:
+					isBullet = true
+				default:
+					// By default it's a regular barrier, even if data is nil
+					isBarrier = true
+				}
+				if isBullet {
+					// ignore bullets for this step
+					continue
+				}
+				bShape := obj.Shape.(*resolv.ConvexPolygon)
+				overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, bShape)
+				if !overlapped {
+					continue
+				}
+				normAlignmentWithGravity := (overlapResult.OverlapX*float64(0) + overlapResult.OverlapY*float64(-1.0))
+				if isAnotherPlayer {
+					// [WARNING] The "zero overlap collision" might be randomly detected/missed on either frontend or backend, to have deterministic result we added paddings to all sides of a playerCollider. As each velocity component of (velX, velY) being a multiple of 0.5 at any renderFrame, each position component of (x, y) can only be a multiple of 0.5 too, thus whenever a 1-dimensional collision happens between players from [player#1: i*0.5, player#2: j*0.5, not collided yet] to [player#1: (i+k)*0.5, player#2: j*0.5, collided], the overlap becomes (i+k-j)*0.5+2*s, and after snapping subtraction the effPushback magnitude for each player is (i+k-j)*0.5, resulting in 0.5-multiples-position for the next renderFrame.
+					pushbackX, pushbackY = (overlapResult.Overlap-snapIntoPlatformOverlap*2)*overlapResult.OverlapX, (overlapResult.Overlap-snapIntoPlatformOverlap*2)*overlapResult.OverlapY
+				}
+				for _, hardPushbackNorm := range *hardPushbackNorms[joinIndex-1] {
+					projectedMagnitude := pushbackX*hardPushbackNorm.X + pushbackY*hardPushbackNorm.Y
+					if isBarrier || (isAnotherPlayer && 0 > projectedMagnitude) {
+						pushbackX -= projectedMagnitude * hardPushbackNorm.X
+						pushbackY -= projectedMagnitude * hardPushbackNorm.Y
+					}
+				}
+				effPushbacks[joinIndex-1].X += pushbackX
+				effPushbacks[joinIndex-1].Y += pushbackY
+
+				if snapIntoPlatformThreshold < normAlignmentWithGravity {
+					landedOnGravityPushback = true
+					//playerColliderCenterX, playerColliderCenterY := playerCollider.Center()
+					//fmt.Printf("joinIndex=%d landedOnGravityPushback\n{renderFrame.id: %d, isBarrier: %v, isAnotherPlayer: %v}\nhardPushbackNormsOfThisPlayer=%v, playerColliderPos=(%.2f,%.2f), immediatePushback={%.3f, %.3f}, effPushback={%.3f, %.3f}, overlapMag=%.4f\n", joinIndex, currRenderFrame.Id, isBarrier, isAnotherPlayer, *hardPushbackNorms[joinIndex-1], playerColliderCenterX, playerColliderCenterY, pushbackX, pushbackY, effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap)
+				}
+			}
+		}
+		if landedOnGravityPushback {
+			thatPlayerInNextFrame.InAir = false
+			if currPlayerDownsync.InAir && 0 >= currPlayerDownsync.VelY {
+				// fallStopping
+				thatPlayerInNextFrame.VelX = 0
+				thatPlayerInNextFrame.VelY = 0
+				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_IDLE1
+				thatPlayerInNextFrame.FramesToRecover = 0
+			}
+		}
+		if currPlayerDownsync.InAir {
+			oldNextCharacterState := thatPlayerInNextFrame.CharacterState
+			switch oldNextCharacterState {
+			case ATK_CHARACTER_STATE_IDLE1, ATK_CHARACTER_STATE_WALKING:
+				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_IDLE1
+			case ATK_CHARACTER_STATE_ATK1:
+				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATK1
+			case ATK_CHARACTER_STATE_ATKED1:
+				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATKED1
+			}
+		}
+	}
+
+	// 5. Check bullet-anything collisions
+	for _, bulletCollider := range bulletColliders {
+		meleeBullet := bulletCollider.Data.(*MeleeBullet)
+		bulletShape := bulletCollider.Shape.(*resolv.ConvexPolygon)
+		collision := bulletCollider.Check(0, 0)
+		bulletCollider.Space.Remove(bulletCollider) // Make sure that the bulletCollider is always removed for each renderFrame
+		if nil == collision {
+			nextRenderFrameMeleeBullets = append(nextRenderFrameMeleeBullets, meleeBullet)
+			continue
+		}
+		offender := currRenderFrame.PlayersArr[meleeBullet.OffenderJoinIndex-1]
+		for _, obj := range collision.Objects {
+			defenderShape := obj.Shape.(*resolv.ConvexPolygon)
+			switch t := obj.Data.(type) {
+			case *PlayerDownsync:
+				if meleeBullet.OffenderPlayerId == t.Id {
+					continue
+				}
+				overlapped, _, _, _ := CalcPushbacks(0, 0, bulletShape, defenderShape)
+				if !overlapped {
+					continue
+				}
+				joinIndex := t.JoinIndex
+				xfac := float64(1.0) // By now, straight Punch offset doesn't respect "y-axis"
+				if 0 > offender.DirX {
+					xfac = float64(-1.0)
+				}
+				pushbackX, pushbackY := -xfac*meleeBullet.Pushback, float64(0)
+
+				for _, hardPushbackNorm := range *hardPushbackNorms[joinIndex-1] {
+					projectedMagnitude := pushbackX*hardPushbackNorm.X + pushbackY*hardPushbackNorm.Y
+					if 0 > projectedMagnitude {
+						//fmt.Printf("defenderPlayerId=%d, joinIndex=%d reducing bullet pushback={%.3f, %.3f} by {%.3f, %.3f} where hardPushbackNorm={%.3f, %.3f}, projectedMagnitude=%.3f at renderFrame.id=%d", t.Id, joinIndex, pushbackX, pushbackY, projectedMagnitude*hardPushbackNorm.X, projectedMagnitude*hardPushbackNorm.Y, hardPushbackNorm.X, hardPushbackNorm.Y, projectedMagnitude, currRenderFrame.Id)
+						pushbackX -= projectedMagnitude * hardPushbackNorm.X
+						pushbackY -= projectedMagnitude * hardPushbackNorm.Y
+					}
+				}
+
+				effPushbacks[joinIndex-1].X += pushbackX
+				effPushbacks[joinIndex-1].Y += pushbackY
+				atkedPlayerInCurFrame, atkedPlayerInNextFrame := currRenderFrame.PlayersArr[t.JoinIndex-1], nextRenderFramePlayers[t.JoinIndex-1]
+				atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_ATKED1
+				if atkedPlayerInCurFrame.InAir {
+					atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATKED1
+				}
+				oldFramesToRecover := nextRenderFramePlayers[t.JoinIndex-1].FramesToRecover
+				if meleeBullet.HitStunFrames > oldFramesToRecover {
+					atkedPlayerInNextFrame.FramesToRecover = meleeBullet.HitStunFrames
+				}
+			default:
+			}
+		}
+	}
+
+	// 6. Get players out of stuck barriers if there's any
+	for i, currPlayerDownsync := range currRenderFrame.PlayersArr {
+		joinIndex := currPlayerDownsync.JoinIndex
+		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
+		playerCollider := collisionSysMap[collisionPlayerIndex]
+		// Update "virtual grid position"
+		thatPlayerInNextFrame := nextRenderFramePlayers[i]
+		thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY = PolygonColliderBLToVirtualGridPos(playerCollider.X-effPushbacks[joinIndex-1].X, playerCollider.Y-effPushbacks[joinIndex-1].Y, playerCollider.W*0.5, playerCollider.H*0.5, 0, 0, 0, 0, collisionSpaceOffsetX, collisionSpaceOffsetY, worldToVirtualGridRatio)
+	}
+
+	return &RoomDownsyncFrame{
+		Id:           currRenderFrame.Id + 1,
+		PlayersArr:   nextRenderFramePlayers,
+		MeleeBullets: nextRenderFrameMeleeBullets,
+	}
+}
+
+func GenerateRectCollider(wx, wy, w, h, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64, data interface{}, tag string) *resolv.Object {
+	blX, blY := WorldToPolygonColliderBLPos(wx, wy, w*0.5, h*0.5, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY)
+	return generateRectColliderInCollisionSpace(blX, blY, leftPadding+w+rightPadding, bottomPadding+h+topPadding, data, tag)
+}
+
+func generateRectColliderInCollisionSpace(blX, blY, w, h float64, data interface{}, tag string) *resolv.Object {
+	collider := resolv.NewObject(blX, blY, w, h, tag) // Unlike its frontend counter part, the position of a "resolv.Object" must be specified by "bottom-left point" because "w" and "h" must be positive, see "resolv.Object.BoundsToSpace" for details
+	shape := resolv.NewRectangle(0, 0, w, h)
+	collider.SetShape(shape)
+	collider.Data = data
+	return collider
+}
+
+func GenerateConvexPolygonCollider(unalignedSrc *Polygon2D, spaceOffsetX, spaceOffsetY float64, data interface{}, tag string) *resolv.Object {
+	aligned := AlignPolygon2DToBoundingBox(unalignedSrc)
+	var w, h float64 = 0, 0
+
+	shape := resolv.NewConvexPolygon()
+	for i, pi := range aligned.Points {
+		for j, pj := range aligned.Points {
+			if i == j {
+				continue
+			}
+			if math.Abs(pj.X-pi.X) > w {
+				w = math.Abs(pj.X - pi.X)
+			}
+			if math.Abs(pj.Y-pi.Y) > h {
+				h = math.Abs(pj.Y - pi.Y)
+			}
+		}
+	}
+
+	for i := 0; i < len(aligned.Points); i++ {
+		p := aligned.Points[i]
+		shape.AddPoints(p.X, p.Y)
+	}
+
+	collider := resolv.NewObject(aligned.Anchor.X+spaceOffsetX, aligned.Anchor.Y+spaceOffsetY, w, h, tag)
+	collider.SetShape(shape)
+	collider.Data = data
+
+	return collider
+}
+
+func AlignPolygon2DToBoundingBox(input *Polygon2D) *Polygon2D {
+	// Transform again to put "anchor" at the "bottom-left point (w.r.t. world space)" of the bounding box for "resolv"
+	boundingBoxBL := &Vec2D{
+		X: MAX_FLOAT64,
+		Y: MAX_FLOAT64,
+	}
+	for _, p := range input.Points {
+		if p.X < boundingBoxBL.X {
+			boundingBoxBL.X = p.X
+		}
+		if p.Y < boundingBoxBL.Y {
+			boundingBoxBL.Y = p.Y
+		}
+	}
+
+	// Now "input.Anchor" should move to "input.Anchor+boundingBoxBL", thus "boundingBoxBL" is also the value of the negative diff for all "input.Points"
+	output := &Polygon2D{
+		Anchor: &Vec2D{
+			X: input.Anchor.X + boundingBoxBL.X,
+			Y: input.Anchor.Y + boundingBoxBL.Y,
+		},
+		Points: make([]*Vec2D, len(input.Points)),
+	}
+
+	for i, p := range input.Points {
+		output.Points[i] = &Vec2D{
+			X: p.X - boundingBoxBL.X,
+			Y: p.Y - boundingBoxBL.Y,
+		}
+	}
+
+	return output
+}
--- a/battle_srv/models/ringbuf.go
+++ b/battle_srv/models/ringbuf.go
@@ -1,4 +1,10 @@
-package models
+package battle
+
+const (
+	RING_BUFF_CONSECUTIVE_SET     = int32(0)
+	RING_BUFF_NON_CONSECUTIVE_SET = int32(1)
+	RING_BUFF_FAILED_TO_SET       = int32(2)
+)

 type RingBuffer struct {
 	Ed        int32 // write index, open index
@@ -48,15 +54,15 @@ func (rb *RingBuffer) Pop() interface{} {
 	return pItem
 }

-func (rb *RingBuffer) GetByOffset(offsetFromSt int32) interface{} {
-	if 0 == rb.Cnt {
-		return nil
+func (rb *RingBuffer) GetArrIdxByOffset(offsetFromSt int32) int32 {
+	if 0 == rb.Cnt || 0 > offsetFromSt {
+		return -1
 	}
 	arrIdx := rb.St + offsetFromSt
 	if rb.St < rb.Ed {
 		// case#1: 0...st...ed...N-1
 		if rb.St <= arrIdx && arrIdx < rb.Ed {
-			return rb.Eles[arrIdx]
+			return arrIdx
 		}
 	} else {
 		// if rb.St >= rb.Ed
@@ -65,11 +71,19 @@ func (rb *RingBuffer) GetByOffset(offsetFromSt int32) interface{} {
 			arrIdx -= rb.N
 		}
 		if arrIdx >= rb.St || arrIdx < rb.Ed {
-			return rb.Eles[arrIdx]
+			return arrIdx
 		}
 	}

-	return nil
+	return -1
+}
+
+func (rb *RingBuffer) GetByOffset(offsetFromSt int32) interface{} {
+	arrIdx := rb.GetArrIdxByOffset(offsetFromSt)
+	if -1 == arrIdx {
+		return nil
+	}
+	return rb.Eles[arrIdx]
 }

 func (rb *RingBuffer) GetByFrameId(frameId int32) interface{} {
@@ -78,3 +92,33 @@ func (rb *RingBuffer) GetByFrameId(frameId int32) interface{} {
 	}
 	return rb.GetByOffset(frameId - rb.StFrameId)
 }
+
+// [WARNING] During a battle, frontend could receive non-consecutive frames (either renderFrame or inputFrame) due to resync, the buffer should handle these frames properly.
+func (rb *RingBuffer) SetByFrameId(pItem interface{}, frameId int32) (int32, int32, int32) {
+	oldStFrameId, oldEdFrameId := rb.StFrameId, rb.EdFrameId
+	if frameId < oldStFrameId {
+		return RING_BUFF_FAILED_TO_SET, oldStFrameId, oldEdFrameId
+	}
+	// By now "rb.StFrameId <= frameId"
+	if oldEdFrameId > frameId {
+		arrIdx := rb.GetArrIdxByOffset(frameId - rb.StFrameId)
+		if -1 != arrIdx {
+			rb.Eles[arrIdx] = pItem
+			return RING_BUFF_CONSECUTIVE_SET, oldStFrameId, oldEdFrameId
+		}
+	}
+
+	// By now "rb.EdFrameId <= frameId"
+	ret := RING_BUFF_CONSECUTIVE_SET
+	if oldEdFrameId < frameId {
+		rb.St, rb.Ed = 0, 0
+		rb.StFrameId, rb.EdFrameId = frameId, frameId
+		rb.Cnt = 0
+		ret = RING_BUFF_NON_CONSECUTIVE_SET
+	}
+
+	// By now "rb.EdFrameId == frameId"
+	rb.Put(pItem)
+
+	return ret, oldStFrameId, oldEdFrameId
+}
--- a/jsexport/battle/room_downsync_frame.go
+++ b/jsexport/battle/room_downsync_frame.go
@@ -0,0 +1,108 @@
+package battle
+
+// TODO: Replace all "int32", "int64", "uint32" and "uint64" with just "int" for better performance in JavaScript! Reference https://github.com/gopherjs/gopherjs#performance-tips
+
+type Vec2D struct {
+	X float64
+	Y float64
+}
+
+type Polygon2D struct {
+	Anchor *Vec2D
+	Points []*Vec2D
+}
+
+type PlayerDownsync struct {
+	Id                int32
+	VirtualGridX      int32
+	VirtualGridY      int32
+	DirX              int32
+	DirY              int32
+	VelX              int32
+	VelY              int32
+	Speed             int32
+	BattleState       int32
+	JoinIndex         int32
+	ColliderRadius    float64
+	Removed           bool
+	Score             int32
+	LastMoveGmtMillis int32
+	FramesToRecover   int32
+	Hp                int32
+	MaxHp             int32
+	CharacterState    int32
+	InAir             bool
+}
+
+type InputFrameDecoded struct {
+	Dx        int32
+	Dy        int32
+	BtnALevel int32
+	BtnBLevel int32
+}
+
+type InputFrameUpsync struct {
+	InputFrameId int32
+	Encoded      uint64
+}
+
+type Barrier struct {
+	Boundary *Polygon2D
+}
+
+type Bullet struct {
+	// for offender
+	BattleLocalId           int32
+	StartupFrames           int32
+	ActiveFrames            int32
+	RecoveryFrames          int32
+	RecoveryFramesOnBlock   int32
+	RecoveryFramesOnHit     int32
+	HitboxOffset            float64
+	OriginatedRenderFrameId int32
+	// for defender
+	HitStunFrames      int32
+	BlockStunFrames    int32
+	Pushback           float64
+	ReleaseTriggerType int32
+	Damage             int32
+	OffenderJoinIndex  int32
+	OffenderPlayerId   int32
+
+	SelfMoveforwardX float64
+	SelfMoveforwardY float64
+	HitboxSizeX      float64
+	HitboxSizeY      float64
+}
+
+type MeleeBullet struct {
+	Bullet
+}
+
+type FireballBullet struct {
+	VirtualGridX int32
+	VirtualGridY int32
+	DirX         int32
+	DirY         int32
+	VelX         int32
+	VelY         int32
+	Speed        int32
+	Bullet
+}
+
+type RoomDownsyncFrame struct {
+	Id                       int32
+	PlayersArr               []*PlayerDownsync
+	CountdownNanos           int64
+	MeleeBullets             []*MeleeBullet
+	FireballBullets          []*FireballBullet
+	BackendUnconfirmedMask   uint64
+	ShouldForceResync        bool
+	PlayerOpPatternToSkillId map[int]int
+}
+
+type InputFrameDownsync struct {
+	InputFrameId  int32
+	InputList     []uint64
+	ConfirmedList uint64
+}
--- a/jsexport/go.mod
+++ b/jsexport/go.mod
@@ -0,0 +1,12 @@
+module jsexport
+
+go 1.18
+
+require (
+	github.com/gopherjs/gopherjs v1.18.0-beta1
+	resolv v0.0.0
+)
+
+replace (
+	resolv => ../resolv_tailored
+)
--- a/jsexport/go.sum
+++ b/jsexport/go.sum
@@ -0,0 +1,2 @@
+github.com/gopherjs/gopherjs v1.18.0-beta1 h1:IbykhVEq4SAjwyBRuNHl0aOO6w6IqgL3RUdMhoBo4mY=
+github.com/gopherjs/gopherjs v1.18.0-beta1/go.mod h1:6UY8PXRnu51MqjYCCY4toG0S5GeH5uVJ3qDxIsa+kqo=
--- a/jsexport/main.go
+++ b/jsexport/main.go
@@ -0,0 +1,155 @@
+package main
+
+import (
+	"github.com/gopherjs/gopherjs/js"
+	. "jsexport/battle"
+	"resolv"
+)
+
+func NewInputFrameDownsync(inputFrameId int32, inputList []uint64, confirmedList uint64) *js.Object {
+	return js.MakeFullWrapper(&InputFrameDownsync{
+		InputFrameId:  inputFrameId,
+		InputList:     inputList,
+		ConfirmedList: confirmedList,
+	})
+}
+
+func NewRingBufferJs(n int32) *js.Object {
+	return js.MakeFullWrapper(NewRingBuffer(n))
+}
+
+func NewCollisionSpaceJs(spaceW, spaceH, minStepW, minStepH int) *js.Object {
+	return js.MakeWrapper(resolv.NewSpace(spaceW, spaceH, minStepW, minStepH))
+}
+
+func NewVec2DJs(x, y float64) *js.Object {
+	return js.MakeFullWrapper(&Vec2D{
+		X: x,
+		Y: y,
+	})
+}
+
+func NewPolygon2DJs(anchor *Vec2D, points []*Vec2D) *js.Object {
+	return js.MakeFullWrapper(&Polygon2D{
+		Anchor: anchor,
+		Points: points,
+	})
+}
+
+func NewBarrierJs(boundary *Polygon2D) *js.Object {
+	return js.MakeWrapper(&Barrier{
+		Boundary: boundary,
+	})
+}
+
+func NewPlayerDownsyncJs(id, virtualGridX, virtualGridY, dirX, dirY, velX, velY, framesToRecover, speed, battleState, characterState, joinIndex, hp, maxHp int32, inAir bool, colliderRadius float64) *js.Object {
+	return js.MakeWrapper(&PlayerDownsync{
+		Id:              id,
+		VirtualGridX:    virtualGridX,
+		VirtualGridY:    virtualGridY,
+		DirX:            dirX,
+		DirY:            dirY,
+		VelX:            velX,
+		VelY:            velY,
+		FramesToRecover: framesToRecover,
+		Speed:           speed,
+		BattleState:     battleState,
+		JoinIndex:       joinIndex,
+		ColliderRadius:  colliderRadius,
+		Hp:              hp,
+		MaxHp:           maxHp,
+		CharacterState:  characterState,
+		InAir:           inAir,
+	})
+}
+
+func NewMeleeBulletJs(battleLocalId, startupFrames, activeFrames, recoveryFrames, recoveryFramesOnBlock, recoveryFramesOnHit, hitStunFrames, blockStunFrames, releaseTriggerType, damage, offenderJoinIndex, offenderPlayerId int32, pushback, hitboxOffset, selfMoveforwardX, selfMoveforwardY, hitboxSizeX, hitboxSizeY float64) *js.Object {
+	return js.MakeWrapper(&MeleeBullet{
+		Bullet: Bullet{
+			BattleLocalId:         battleLocalId,
+			StartupFrames:         startupFrames,
+			ActiveFrames:          activeFrames,
+			RecoveryFrames:        recoveryFrames,
+			RecoveryFramesOnBlock: recoveryFramesOnBlock,
+			RecoveryFramesOnHit:   recoveryFramesOnHit,
+			HitboxOffset:          hitboxOffset,
+			HitStunFrames:         hitStunFrames,
+			BlockStunFrames:       blockStunFrames,
+			Pushback:              pushback,
+			ReleaseTriggerType:    releaseTriggerType,
+			Damage:                damage,
+
+			SelfMoveforwardX: selfMoveforwardX,
+			SelfMoveforwardY: selfMoveforwardY,
+			HitboxSizeX:      hitboxSizeX,
+			HitboxSizeY:      hitboxSizeY,
+
+			OffenderJoinIndex: offenderJoinIndex,
+			OffenderPlayerId:  offenderPlayerId,
+		},
+	})
+}
+
+func NewRoomDownsyncFrameJs(id int32, playersArr []*PlayerDownsync, meleeBullets []*MeleeBullet) *js.Object {
+	// [WARNING] Avoid using "pb.RoomDownsyncFrame" here, in practive "MakeFullWrapper" doesn't expose the public fields for a "protobuf struct" as expected and requires helper functions like "GetCollisionSpaceObjsJs".
+	return js.MakeFullWrapper(&RoomDownsyncFrame{
+		Id:           id,
+		PlayersArr:   playersArr,
+		MeleeBullets: meleeBullets,
+	})
+}
+
+func GetCollisionSpaceObjsJs(space *resolv.Space) []*js.Object {
+	// [WARNING] We couldn't just use the existing method "space.Objects()" to access them in JavaScript, there'd a stackoverflow error
+	objs := space.Objects()
+	ret := make([]*js.Object, 0, len(objs))
+	for _, obj := range objs {
+		ret = append(ret, js.MakeFullWrapper(obj))
+	}
+	return ret
+}
+
+func GenerateRectColliderJs(wx, wy, w, h, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64, data interface{}, tag string) *js.Object {
+	/*
+			   [WARNING] It's important to note that we don't need "js.MakeFullWrapper" for a call sequence as follows.
+			   ```
+			       var space = gopkgs.NewCollisionSpaceJs(2048, 2048, 8, 8);
+			       var a = gopkgs.GenerateRectColliderJs(189, 497, 48, 48, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, spaceOffsetX, spaceOffsetY, "Player");
+			       space.Add(a);
+			   ```
+			   The "space" variable doesn't need access to the field of "a" in JavaScript level to run "space.Add(...)" method, which is good.
+
+		       However, the full wrapper access here is used for updating "collider.X/collider.Y" at JavaScript runtime.
+	*/
+	return js.MakeFullWrapper(GenerateRectCollider(wx, wy, w, h, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, data, tag))
+
+}
+
+func GenerateConvexPolygonColliderJs(unalignedSrc *Polygon2D, spaceOffsetX, spaceOffsetY float64, data interface{}, tag string) *js.Object {
+	return js.MakeFullWrapper(GenerateConvexPolygonCollider(unalignedSrc, spaceOffsetX, spaceOffsetY, data, tag))
+}
+
+func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrameJs(inputsBuffer *RingBuffer, currRenderFrame *RoomDownsyncFrame, collisionSys *resolv.Space, collisionSysMap map[int32]*resolv.Object, gravityX, gravityY, jumpingInitVelY, inputDelayFrames int32, inputScaleFrames uint32, collisionSpaceOffsetX, collisionSpaceOffsetY, snapIntoPlatformOverlap, snapIntoPlatformThreshold, worldToVirtualGridRatio, virtualGridToWorldRatio float64, playerOpPatternToSkillId map[int]int) *js.Object {
+	// We need access to all fields of RoomDownsyncFrame for displaying in frontend
+	return js.MakeFullWrapper(ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer, currRenderFrame, collisionSys, collisionSysMap, gravityX, gravityY, jumpingInitVelY, inputDelayFrames, inputScaleFrames, collisionSpaceOffsetX, collisionSpaceOffsetY, snapIntoPlatformOverlap, snapIntoPlatformThreshold, worldToVirtualGridRatio, virtualGridToWorldRatio, playerOpPatternToSkillId))
+}
+
+func main() {
+	js.Global.Set("gopkgs", map[string]interface{}{
+		"NewVec2DJs":                      NewVec2DJs,
+		"NewPolygon2DJs":                  NewPolygon2DJs,
+		"NewBarrierJs":                    NewBarrierJs,
+		"NewPlayerDownsyncJs":             NewPlayerDownsyncJs,
+		"NewMeleeBulletJs":                NewMeleeBulletJs,
+		"NewRoomDownsyncFrameJs":          NewRoomDownsyncFrameJs,
+		"NewCollisionSpaceJs":             NewCollisionSpaceJs,
+		"NewInputFrameDownsync":           NewInputFrameDownsync,
+		"NewRingBufferJs":                 NewRingBufferJs,
+		"GenerateRectColliderJs":          GenerateRectColliderJs,
+		"GenerateConvexPolygonColliderJs": GenerateConvexPolygonColliderJs,
+		"GetCollisionSpaceObjsJs":         GetCollisionSpaceObjsJs,
+		"ApplyInputFrameDownsyncDynamicsOnSingleRenderFrameJs": ApplyInputFrameDownsyncDynamicsOnSingleRenderFrameJs,
+		"WorldToPolygonColliderBLPos":                          WorldToPolygonColliderBLPos, // No need to wrap primitive return types
+		"PolygonColliderBLToWorldPos":                          PolygonColliderBLToWorldPos,
+	})
+}
--- a/proto_gen_shortcut.sh
+++ b/proto_gen_shortcut.sh
@@ -6,7 +6,7 @@

 golang_basedir_1=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/dnmshared
 protoc -I=$golang_basedir_1/../frontend/assets/resources/pbfiles/ --go_out=. geometry.proto 
-echo "GOLANG part 1 done"
+echo "GOLANG part 1 done" # [WARNING] The output of "part 1" is DEPRECATED, the codes are not using it anymore. 

 # [WARNING] The following "room_downsync_frame.proto" is generated in another Go package than "geometry.proto", but the generated Go codes are also required to work with imports correctly!
 golang_basedir_2=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/battle_srv
--- a/resolv_tailored/.gitignore
+++ b/resolv_tailored/.gitignore
@@ -0,0 +1,14 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+Game
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+.vscode/launch.json
--- a/resolv_tailored/LICENSE
+++ b/resolv_tailored/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018-2021 SolarLune
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/resolv_tailored/asm_axpyunitaryto_amd64.s
+++ b/resolv_tailored/asm_axpyunitaryto_amd64.s
@@ -0,0 +1,164 @@
+// This file contains code from the gonum repository:
+// https://github.com/gonum/gonum/blob/master/internal/asm/f64/scalunitaryto_amd64.s
+// it is distributed under the 3-Clause BSD license:
+//
+// Copyright ©2013 The Gonum Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the Gonum project nor the names of its authors and
+//       contributors may be used to endorse or promote products derived from this
+//       software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Some of the loop unrolling code is copied from:
+// http://golang.org/src/math/big/arith_amd64.s
+// which is distributed under these terms:
+//
+// Copyright (c) 2012 The Go Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+//      notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+//      copyright notice, this list of conditions and the following disclaimer
+//      in the documentation and/or other materials provided with the
+//      distribution.
+//    * Neither the name of Google Inc. nor the names of its
+//      contributors may be used to endorse or promote products derived from
+//      this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build !noasm
+
+#include "textflag.h"
+
+#define X_PTR SI
+#define Y_PTR DX
+#define DST_PTR DI
+#define IDX AX
+#define LEN CX
+#define TAIL BX
+#define ALPHA X0
+#define ALPHA_2 X1
+
+// func axpyUnitaryTo(dst []float64, alpha float64, x, y []float64)
+TEXT ·axpyUnitaryTo(SB), NOSPLIT, $0
+	MOVQ    dst_base+0(FP), DST_PTR // DST_PTR := &dst
+	MOVQ    x_base+32(FP), X_PTR    // X_PTR := &x
+	MOVQ    y_base+56(FP), Y_PTR    // Y_PTR := &y
+	MOVQ    x_len+40(FP), LEN       // LEN = min( len(x), len(y), len(dst) )
+	CMPQ    y_len+64(FP), LEN
+	CMOVQLE y_len+64(FP), LEN
+	CMPQ    dst_len+8(FP), LEN
+	CMOVQLE dst_len+8(FP), LEN
+
+	CMPQ LEN, $0
+	JE   end     // if LEN == 0 { return }
+
+	XORQ   IDX, IDX            // IDX = 0
+	MOVSD  alpha+24(FP), ALPHA
+	SHUFPD $0, ALPHA, ALPHA    // ALPHA := { alpha, alpha }
+	MOVQ   Y_PTR, TAIL         // Check memory alignment
+	ANDQ   $15, TAIL           // TAIL = &y % 16
+	JZ     no_trim             // if TAIL == 0 { goto no_trim }
+
+	// Align on 16-byte boundary
+	MOVSD (X_PTR), X2   // X2 := x[0]
+	MULSD ALPHA, X2     // X2 *= a
+	ADDSD (Y_PTR), X2   // X2 += y[0]
+	MOVSD X2, (DST_PTR) // y[0] = X2
+	INCQ  IDX           // i++
+	DECQ  LEN           // LEN--
+	JZ    end           // if LEN == 0 { return }
+
+no_trim:
+	MOVQ LEN, TAIL
+	ANDQ $7, TAIL   // TAIL := n % 8
+	SHRQ $3, LEN    // LEN = floor( n / 8 )
+	JZ   tail_start // if LEN == 0 { goto tail_start }
+
+	MOVUPS ALPHA, ALPHA_2 // ALPHA_2 := ALPHA  for pipelining
+
+loop:  // do {
+	// y[i] += alpha * x[i] unrolled 8x.
+	MOVUPS (X_PTR)(IDX*8), X2   // X_i = x[i]
+	MOVUPS 16(X_PTR)(IDX*8), X3
+	MOVUPS 32(X_PTR)(IDX*8), X4
+	MOVUPS 48(X_PTR)(IDX*8), X5
+
+	MULPD ALPHA, X2   // X_i *= alpha
+	MULPD ALPHA_2, X3
+	MULPD ALPHA, X4
+	MULPD ALPHA_2, X5
+
+	ADDPD (Y_PTR)(IDX*8), X2   // X_i += y[i]
+	ADDPD 16(Y_PTR)(IDX*8), X3
+	ADDPD 32(Y_PTR)(IDX*8), X4
+	ADDPD 48(Y_PTR)(IDX*8), X5
+
+	MOVUPS X2, (DST_PTR)(IDX*8)   // y[i] = X_i
+	MOVUPS X3, 16(DST_PTR)(IDX*8)
+	MOVUPS X4, 32(DST_PTR)(IDX*8)
+	MOVUPS X5, 48(DST_PTR)(IDX*8)
+
+	ADDQ $8, IDX  // i += 8
+	DECQ LEN
+	JNZ  loop     // } while --LEN > 0
+	CMPQ TAIL, $0 // if TAIL == 0 { return }
+	JE   end
+
+tail_start: // Reset loop registers
+	MOVQ TAIL, LEN // Loop counter: LEN = TAIL
+	SHRQ $1, LEN   // LEN = floor( TAIL / 2 )
+	JZ   tail_one  // if LEN == 0 { goto tail }
+
+tail_two: // do {
+	MOVUPS (X_PTR)(IDX*8), X2   // X2 = x[i]
+	MULPD  ALPHA, X2            // X2 *= alpha
+	ADDPD  (Y_PTR)(IDX*8), X2   // X2 += y[i]
+	MOVUPS X2, (DST_PTR)(IDX*8) // y[i] = X2
+	ADDQ   $2, IDX              // i += 2
+	DECQ   LEN
+	JNZ    tail_two             // } while --LEN > 0
+
+	ANDQ $1, TAIL
+	JZ   end      // if TAIL == 0 { goto end }
+
+tail_one:
+	MOVSD (X_PTR)(IDX*8), X2   // X2 = x[i]
+	MULSD ALPHA, X2            // X2 *= a
+	ADDSD (Y_PTR)(IDX*8), X2   // X2 += y[i]
+	MOVSD X2, (DST_PTR)(IDX*8) // y[i] = X2
+
+end:
+	RET
--- a/resolv_tailored/asm_scalunitaryto_amd64.s
+++ b/resolv_tailored/asm_scalunitaryto_amd64.s
@@ -0,0 +1,137 @@
+// This file contains code from the gonum repository:
+// https://github.com/gonum/gonum/blob/master/internal/asm/f64/axpyunitaryto_amd64.s
+// it is distributed under the 3-Clause BSD license:
+//
+// Copyright ©2013 The Gonum Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the Gonum project nor the names of its authors and
+//       contributors may be used to endorse or promote products derived from this
+//       software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Some of the loop unrolling code is copied from:
+// http://golang.org/src/math/big/arith_amd64.s
+// which is distributed under these terms:
+//
+// Copyright (c) 2012 The Go Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+//      notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+//      copyright notice, this list of conditions and the following disclaimer
+//      in the documentation and/or other materials provided with the
+//      distribution.
+//    * Neither the name of Google Inc. nor the names of its
+//      contributors may be used to endorse or promote products derived from
+//      this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build !noasm
+
+#include "textflag.h"
+
+#define MOVDDUP_ALPHA    LONG $0x44120FF2; WORD $0x2024 // @ MOVDDUP 32(SP), X0  /*XMM0, 32[RSP]*/
+
+#define X_PTR SI
+#define DST_PTR DI
+#define IDX AX
+#define LEN CX
+#define TAIL BX
+#define ALPHA X0
+#define ALPHA_2 X1
+
+// func scalUnitaryTo(dst []float64, alpha float64, x []float64)
+// This function assumes len(dst) >= len(x).
+TEXT ·scalUnitaryTo(SB), NOSPLIT, $0
+	MOVQ x_base+32(FP), X_PTR    // X_PTR = &x
+	MOVQ dst_base+0(FP), DST_PTR // DST_PTR = &dst
+	MOVDDUP_ALPHA                // ALPHA = { alpha, alpha }
+	MOVQ x_len+40(FP), LEN       // LEN = len(x)
+	CMPQ LEN, $0
+	JE   end                     // if LEN == 0 { return }
+
+	XORQ IDX, IDX   // IDX = 0
+	MOVQ LEN, TAIL
+	ANDQ $7, TAIL   // TAIL = LEN % 8
+	SHRQ $3, LEN    // LEN = floor( LEN / 8 )
+	JZ   tail_start // if LEN == 0 { goto tail_start }
+
+	MOVUPS ALPHA, ALPHA_2 // ALPHA_2 = ALPHA for pipelining
+
+loop:  // do { // dst[i] = alpha * x[i] unrolled 8x.
+	MOVUPS (X_PTR)(IDX*8), X2   // X_i = x[i]
+	MOVUPS 16(X_PTR)(IDX*8), X3
+	MOVUPS 32(X_PTR)(IDX*8), X4
+	MOVUPS 48(X_PTR)(IDX*8), X5
+
+	MULPD ALPHA, X2   // X_i *= ALPHA
+	MULPD ALPHA_2, X3
+	MULPD ALPHA, X4
+	MULPD ALPHA_2, X5
+
+	MOVUPS X2, (DST_PTR)(IDX*8)   // dst[i] = X_i
+	MOVUPS X3, 16(DST_PTR)(IDX*8)
+	MOVUPS X4, 32(DST_PTR)(IDX*8)
+	MOVUPS X5, 48(DST_PTR)(IDX*8)
+
+	ADDQ $8, IDX  // i += 8
+	DECQ LEN
+	JNZ  loop     // while --LEN > 0
+	CMPQ TAIL, $0
+	JE   end      // if TAIL == 0 { return }
+
+tail_start: // Reset loop counters
+	MOVQ TAIL, LEN // Loop counter: LEN = TAIL
+	SHRQ $1, LEN   // LEN = floor( TAIL / 2 )
+	JZ   tail_one  // if LEN == 0 { goto tail_one }
+
+tail_two: // do {
+	MOVUPS (X_PTR)(IDX*8), X2   // X_i = x[i]
+	MULPD  ALPHA, X2            // X_i *= ALPHA
+	MOVUPS X2, (DST_PTR)(IDX*8) // dst[i] = X_i
+	ADDQ   $2, IDX              // i += 2
+	DECQ   LEN
+	JNZ    tail_two             // while --LEN > 0
+
+	ANDQ $1, TAIL
+	JZ   end      // if TAIL == 0 { return }
+
+tail_one:
+	MOVSD (X_PTR)(IDX*8), X2   // X_i = x[i]
+	MULSD ALPHA, X2            // X_i *= ALPHA
+	MOVSD X2, (DST_PTR)(IDX*8) // dst[i] = X_i
+
+end:
+	RET
--- a/resolv_tailored/asm_stubs_amd64.go
+++ b/resolv_tailored/asm_stubs_amd64.go
@@ -0,0 +1,9 @@
+//go:build !noasm
+// +build !noasm
+
+package resolv
+
+// functions from the gonum package that optimizes arithmetic
+// operations on lists of float64 values
+func axpyUnitaryTo(dst []float64, alpha float64, x, y []float64)
+func scalUnitaryTo(dst []float64, alpha float64, x []float64)
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Wing	b34fa79aeb	Merge pull request #16 from genxium/gopherjs Employed Gopherjs into unified game dynamics codegen.	2022-12-29 15:11:37 +08:00
genxium	b466f1196d	Minor fix.	2022-12-29 15:06:06 +08:00
genxium	ec8760c24b	Fixed PlayerDownsync end-to-end communication.	2022-12-29 15:03:40 +08:00
genxium	d773b57299	Minor fix.	2022-12-29 14:09:56 +08:00
genxium	69f0ddc171	Initial recovery of MeleeBullet in online battle.	2022-12-29 12:21:01 +08:00
genxium	11d001465d	Putting back MeleeBullets into game mechanics.	2022-12-28 23:12:02 +08:00
genxium	f4868197b6	Temp broken commit during refactoration of jsexport inputbuffer handling.	2022-12-28 18:28:42 +08:00
genxium	c017aaa7ed	Formalized use of frame data logging.	2022-12-27 10:23:30 +08:00
genxium	335e11e925	Finally fixed inconsistent pushbacks between frontend and backend.	2022-12-26 22:50:13 +08:00
genxium	bb6055f48c	Fixed collider visualizer.	2022-12-26 20:37:40 +08:00
genxium	ac5217611d	Added basic frontend-backend dynamics comparison logging.	2022-12-26 18:25:20 +08:00
genxium	0b0de0beb3	Fixes for backend integration.	2022-12-26 15:11:35 +08:00
genxium	bc8eab8115	Fixes for frontend rollback field access.	2022-12-26 12:27:05 +08:00
genxium	a85c6f9ad8	Refactored backend to use jsexport dynamics.	2022-12-26 00:01:12 +08:00
genxium	8139a00939	Optimized jsexport by tailored resolv lib.	2022-12-25 18:44:29 +08:00
genxium	9ffcc6fbd8	Temp broken commit, refactoring battle_srv to use jsexport.	2022-12-25 15:39:30 +08:00
genxium	013c1ea312	Fixed character offset in OfflineMap2.	2022-12-25 14:18:48 +08:00
genxium	72782735d3	First successful run in OfflineMap using gopkgs dynamics.	2022-12-24 22:27:31 +08:00
genxium	cb571f56e8	Attempts to make OfflineMap2 work.	2022-12-24 19:06:31 +08:00
genxium	8a9d449d83	Added necessary js type exposure to jsexport.	2022-12-24 13:57:32 +08:00
genxium	df5c9fda30	Drafted use of dynamics in jsexport.	2022-12-23 22:31:55 +08:00
genxium	9d03794e49	Minor fix.	2022-12-23 17:46:44 +08:00
genxium	69e6baf8e7	Initial trial and error draft of using gopherjs.	2022-12-23 17:31:04 +08:00
genxium	faee73ae50	Enhanced frontend logging.	2022-12-22 21:27:14 +08:00
genxium	14bb6fa1ea	Fixes for frontend chaser.	2022-12-22 11:35:18 +08:00
genxium	3c15e21652	Added prediction fault detection in frontend.	2022-12-20 23:51:53 +08:00
genxium	727e66787f	Added inactive watchdog hint in frontend.	2022-12-20 16:01:44 +08:00
genxium	9eb6ad26ef	Fixed non-integer barrier boundaries.	2022-12-20 07:41:20 +08:00
genxium	847607f3e6	Further enhanced comments.	2022-12-19 20:49:34 +08:00
genxium	8d2665ebd7	Updated comments.	2022-12-19 14:56:56 +08:00
genxium	1694287083	Fixed script file modes.	2022-12-19 14:19:43 +08:00
genxium	e63ce2c484	Fixed backend session watchdog.	2022-12-19 14:16:53 +08:00
genxium	a28c9a31f9	Updated dungeon map.	2022-12-18 22:53:55 +08:00
genxium	3b186c7f75	Minor fix.	2022-12-18 20:28:53 +08:00
genxium	34c4a24b64	Further enhanced backend dynamics force confirmation trigger.	2022-12-18 19:41:13 +08:00
genxium	4e7c3060fe	Fixed frontend packaging.	2022-12-18 16:59:38 +08:00
genxium	2928cbbe3c	Updated comments.	2022-12-18 14:03:22 +08:00
genxium	850eee20a8	Enhanced forceConfirmation trigger for backend dynamics.	2022-12-18 12:20:44 +08:00
genxium	5eec7fcfe7	Minor fix.	2022-12-17 18:22:52 +08:00
genxium	4e42c0770c	Updated anim of the second character.	2022-12-17 18:15:29 +08:00
genxium	8647c1a859	Enhanced force-resync mechanism to guarantee consistency across all players in a same room upon anyone reconnected.	2022-12-16 18:59:58 +08:00
genxium	a41c68fb13	Applied snapping on all-sides to avoid random zero-overlap detection uncertainty.	2022-12-16 15:57:49 +08:00
Wing	c5b26d716e	Merge pull request #15 from genxium/jumping_impl Added jumping sync.	2022-12-15 15:41:57 +08:00
genxium	1e0959c4cf	Updated README.	2022-12-15 15:40:08 +08:00
genxium	3e54670a1b	Updated ConcerningEdgeCases.md	2022-12-15 15:03:41 +08:00
genxium	b41b86bbd3	Fixes for bullet and anim offset.	2022-12-15 12:43:34 +08:00
genxium	db2bc0e3cd	Updated barrier boundaries and player collider paddings to feature almost-all-integer coordinates.	2022-12-15 11:22:17 +08:00
genxium	eedcf5c4dc	Temp broken commit.	2022-12-14 23:17:06 +08:00
genxium	c171ebc211	Draft version for jumping with backend sync.	2022-12-13 23:56:56 +08:00
genxium	5a463239bb	Temp broken commit, but it's working for OfflineMap.	2022-12-13 16:42:31 +08:00
genxium	5c06cfdbac	More preparations on backend to sync jumping.	2022-12-12 19:11:59 +08:00
genxium	7985a242fd	Updated OfflineMap position loading.	2022-12-12 16:42:11 +08:00
genxium	bef1df48aa	Prepared backend for jumping sync.	2022-12-11 20:09:06 +08:00
genxium	8d989d543a	Improved offline map for code abstraction and testing.	2022-12-11 17:26:55 +08:00
genxium	849ce34fe5	Added debug drawing for OfflineMap.	2022-12-11 12:20:42 +08:00
genxium	195a400dc2	Minor fix.	2022-12-10 18:12:20 +08:00
genxium	66dfcaa0f5	Fixes for platform snapping.	2022-12-10 12:47:02 +08:00
genxium	9917a62526	Drafted basic jumping.	2022-12-10 00:07:03 +08:00
genxium	62e50f8b6c	Drafted use of gravity.	2022-12-09 17:22:04 +08:00
genxium	dc66be1599	Improved use of backend ConvertToLastUsedRenderFrameId.	2022-12-06 20:56:09 +08:00
genxium	858eba5243	Updated comments.	2022-12-06 13:53:27 +08:00