Enhanced forceConfirmation trigger for backend dynamics.

Added jumping sync.

ConcerningEdgeCases.md

@@ -1,3 +1,7 @@
+# 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 local lag
 Under the current "input delay" algorithm, the lag of a single player would cause all the other players to receive outdated commands, e.g. when at a certain moment   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
@@ -7,9 +11,11 @@ Under the current "input delay" algorithm, the lag of a single player would caus
 
 players #2, #3 #4 would receive "outdated(in their subjective feelings) but all-confirmed commands" from then on, thus forced to rollback and chase many frames - the lag due to "large range of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 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an inputFrame without player#1's upsync, and notify player#1 to apply a "roomDownsyncFrame" as well as drop all its outdated local inputFrames.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            

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.

battle_srv/models/pb_type_convert.go

@@ -17,12 +17,16 @@ func toPbPlayers(modelInstances map[int32]*Player, withMetaInfo bool) map[int32]
 			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

battle_srv/models/room.go

@@ -61,10 +61,13 @@ const (
 )
 
 const (
-	ATK_CHARACTER_STATE_IDLE1   = 0
+	ATK_CHARACTER_STATE_IDLE1        = int32(0)
-	ATK_CHARACTER_STATE_WALKING = 1
+	ATK_CHARACTER_STATE_WALKING      = int32(1)
-	ATK_CHARACTER_STATE_ATK1    = 2
+	ATK_CHARACTER_STATE_ATK1         = int32(2)
-	ATK_CHARACTER_STATE_ATKED1  = 3
+	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)
 )
 
 const (
@@ -158,8 +161,9 @@ type Room struct {
 	DismissalWaitGroup                     sync.WaitGroup
 	Barriers                               map[int32]*Barrier
 	InputsBuffer                           *RingBuffer // Indices are STRICTLY consecutive
-	InputsBufferLock                       sync.Mutex  // Guards [InputsBuffer, LastAllConfirmedInputFrameId, LastAllConfirmedInputList, LastAllConfirmedInputFrameIdWithChange]
+	InputsBufferLock                       sync.Mutex  // Guards [InputsBuffer, LatestPlayerUpsyncedInputFrameId, LastAllConfirmedInputFrameId, LastAllConfirmedInputList, LastAllConfirmedInputFrameIdWithChange]
 	RenderFrameBuffer                      *RingBuffer // Indices are STRICTLY consecutive
+	LatestPlayerUpsyncedInputFrameId       int32
 	LastAllConfirmedInputFrameId           int32
 	LastAllConfirmedInputFrameIdWithChange int32
 	LastAllConfirmedInputList              []uint64
@@ -198,6 +202,7 @@ func (pR *Room) AddPlayerIfPossible(pPlayerFromDbInit *Player, session *websocke
 	pPlayerFromDbInit.BattleState = PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK
 	pPlayerFromDbInit.Speed = pR.PlayerDefaultSpeed          // Hardcoded
 	pPlayerFromDbInit.ColliderRadius = DEFAULT_PLAYER_RADIUS // Hardcoded
+	pPlayerFromDbInit.InAir = true                           // Hardcoded
 
 	pR.Players[playerId] = pPlayerFromDbInit
 	pR.PlayerDownsyncSessionDict[playerId] = session
@@ -229,6 +234,7 @@ func (pR *Room) ReAddPlayerIfPossible(pTmpPlayerInstance *Player, session *webso
 	pEffectiveInRoomPlayerInstance.BattleState = PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK
 	pEffectiveInRoomPlayerInstance.Speed = pR.PlayerDefaultSpeed          // Hardcoded
 	pEffectiveInRoomPlayerInstance.ColliderRadius = DEFAULT_PLAYER_RADIUS // Hardcoded
+	pEffectiveInRoomPlayerInstance.InAir = true                           // Hardcoded
 
 	pR.PlayerDownsyncSessionDict[playerId] = session
 	pR.PlayerSignalToCloseDict[playerId] = signalToCloseConnOfThisPlayer
@@ -396,11 +402,11 @@ func (pR *Room) StartBattle() {
 	pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY = float64(spaceW)*0.5, float64(spaceH)*0.5
 	pR.refreshColliders(spaceW, spaceH)
 
-	/**
+	/*
-		 * Will be triggered from a goroutine which executes the critical `Room.AddPlayerIfPossible`, thus the `battleMainLoop` should be detached.
+			  Will be triggered from a goroutine which executes the critical `Room.AddPlayerIfPossible`, thus the `battleMainLoop` should be detached.
-		 * All of the consecutive stages, e.g. settlement, dismissal, should share the same goroutine with `battleMainLoop`.
+			  All of the consecutive stages, e.g. settlement, dismissal, should share the same goroutine with `battleMainLoop`.
-	     *
+
-	     * As "defer" is only applicable to function scope, the use of "pR.InputsBufferLock" within "battleMainLoop" is embedded into each subroutine call.
+		      As "defer" is only applicable to function scope, the use of "pR.InputsBufferLock" within "battleMainLoop" is embedded into each subroutine call.
 	*/
 	battleMainLoop := func() {
 		defer func() {
@@ -419,7 +425,7 @@ func (pR *Room) StartBattle() {
 			stCalculation := utils.UnixtimeNano()
 			elapsedNanosSinceLastFrameIdTriggered := stCalculation - pR.LastRenderFrameIdTriggeredAt
 			if elapsedNanosSinceLastFrameIdTriggered < pR.RollbackEstimatedDtNanos {
-				Logger.Warn(fmt.Sprintf("renderFrameId=%v@roomId=%v: Is backend running too fast? elapsedNanosSinceLastFrameIdTriggered=%v", pR.RenderFrameId, pR.Id, elapsedNanosSinceLastFrameIdTriggered))
+				Logger.Debug(fmt.Sprintf("renderFrameId=%v@roomId=%v: Is backend running too fast? elapsedNanosSinceLastFrameIdTriggered=%v", pR.RenderFrameId, pR.Id, elapsedNanosSinceLastFrameIdTriggered))
 			}
 
 			if pR.RenderFrameId > pR.BattleDurationFrames {
@@ -430,24 +436,6 @@ func (pR *Room) StartBattle() {
 				return
 			}
 
-			if 0 == pR.RenderFrameId {
-				for _, player := range pR.PlayersArr {
-					playerId := player.Id
-					thatPlayerBattleState := atomic.LoadInt32(&(player.BattleState)) // Might be changed in "OnPlayerDisconnected/OnPlayerLost" from other threads
-					// [WARNING] DON'T try to send any message to an inactive player!
-					switch thatPlayerBattleState {
-					case PlayerBattleStateIns.DISCONNECTED:
-					case PlayerBattleStateIns.LOST:
-					case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-					case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
-						continue
-					}
-					kickoffFrame := pR.RenderFrameBuffer.GetByFrameId(0).(*RoomDownsyncFrame)
-					pR.sendSafely(kickoffFrame, nil, DOWNSYNC_MSG_ACT_BATTLE_START, playerId, true)
-				}
-				Logger.Info(fmt.Sprintf("In `battleMainLoop` for roomId=%v sent out kickoffFrame", pR.Id))
-			}
-
 			/*
 			   [WARNING]
 			   Golang "time.Sleep" is known to be taking longer than specified time to wake up at millisecond granularity, as discussed in https://github.com/golang/go/issues/44343
@@ -457,6 +445,21 @@ func (pR *Room) StartBattle() {
 			nextRenderFrameId := int32((totalElapsedNanos + pR.dilutedRollbackEstimatedDtNanos - 1) / pR.dilutedRollbackEstimatedDtNanos) // fast ceiling
 			toSleepNanos := int64(0)
 			if nextRenderFrameId > pR.RenderFrameId {
+				if 0 == pR.RenderFrameId {
+					// It's important to send kickoff frame iff  "0 == pR.RenderFrameId && nextRenderFrameId > pR.RenderFrameId", otherwise it might send duplicate kickoff frames
+					for _, player := range pR.PlayersArr {
+						playerId := player.Id
+						thatPlayerBattleState := atomic.LoadInt32(&(player.BattleState)) // Might be changed in "OnPlayerDisconnected/OnPlayerLost" from other threads
+						// [WARNING] DON'T try to send any message to an inactive player!
+						switch thatPlayerBattleState {
+						case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
+							continue
+						}
+						kickoffFrame := pR.RenderFrameBuffer.GetByFrameId(0).(*RoomDownsyncFrame)
+						pR.sendSafely(kickoffFrame, nil, DOWNSYNC_MSG_ACT_BATTLE_START, playerId, true)
+					}
+					Logger.Info(fmt.Sprintf("In `battleMainLoop` for roomId=%v sent out kickoffFrame", pR.Id))
+				}
 				prevRenderFrameId := pR.RenderFrameId
 				pR.RenderFrameId = nextRenderFrameId
 
@@ -495,16 +498,12 @@ func (pR *Room) StartBattle() {
 			case inputsBufferSnapshot := <-playerDownsyncChan:
 				nowBattleState := atomic.LoadInt32(&pR.State)
 				switch nowBattleState {
-				case RoomBattleStateIns.IDLE:
+				case RoomBattleStateIns.IDLE, RoomBattleStateIns.STOPPING_BATTLE_FOR_SETTLEMENT, RoomBattleStateIns.IN_SETTLEMENT, RoomBattleStateIns.IN_DISMISSAL:
-				case RoomBattleStateIns.STOPPING_BATTLE_FOR_SETTLEMENT:
-				case RoomBattleStateIns.IN_SETTLEMENT:
-				case RoomBattleStateIns.IN_DISMISSAL:
 					Logger.Warn(fmt.Sprintf("Battle is not waiting/preparing/active for playerDownsyncChan for (roomId: %d, playerId:%d)", pR.Id, playerId))
 					return
 				}
-
+				pR.downsyncToSinglePlayer(playerId, player, inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, inputsBufferSnapshot.ToSendInputFrameDownsyncs, inputsBufferSnapshot.ShouldForceResync)
-				pR.downsyncToSinglePlayer(playerId, player, inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, inputsBufferSnapshot.ToSendInputFrameDownsyncs)
+				//Logger.Info(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d)#2", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId))
-				Logger.Debug(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d)#2", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId))
 			default:
 			}
 		}
@@ -563,12 +562,12 @@ func (pR *Room) OnBattleCmdReceived(pReq *WsReq) {
 	atomic.StoreInt32(&(player.AckingFrameId), ackingFrameId)
 	atomic.StoreInt32(&(player.AckingInputFrameId), ackingInputFrameId)
 
-	Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock about to lock: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
+	//Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock about to lock: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
 	pR.InputsBufferLock.Lock()
-	Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock locked: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
+	//Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock locked: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
 	defer func() {
 		pR.InputsBufferLock.Unlock()
-		Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock unlocked: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
+		//Logger.Debug(fmt.Sprintf("OnBattleCmdReceived-InputsBufferLock unlocked: roomId=%v, fromPlayerId=%v", pR.Id, playerId))
 	}()
 
 	inputsBufferSnapshot := pR.markConfirmationIfApplicable(inputFrameUpsyncBatch, playerId, player)
@@ -735,6 +734,7 @@ func (pR *Room) OnDismissed() {
 	pR.RenderFrameBuffer = NewRingBuffer(pR.RenderCacheSize)
 	pR.InputsBuffer = NewRingBuffer((pR.RenderCacheSize >> 1) + 1)
 
+	pR.LatestPlayerUpsyncedInputFrameId = -1
 	pR.LastAllConfirmedInputFrameId = -1
 	pR.LastAllConfirmedInputFrameIdWithChange = -1
 	pR.LastAllConfirmedInputList = make([]uint64, pR.Capacity)
@@ -747,9 +747,9 @@ func (pR *Room) OnDismissed() {
 	pR.ServerFps = 60
 	pR.RollbackEstimatedDtMillis = 16.667  // Use fixed-and-low-precision to mitigate the inconsistent floating-point-number issue between Golang and JavaScript
 	pR.RollbackEstimatedDtNanos = 16666666 // A little smaller than the actual per frame time, just for logging FAST FRAME
-	dilutedServerFps := float64(55.0)
+	dilutedServerFps := float64(58.0)      // Don't set this value too small, otherwise we might miss force confirmation needs for slow tickers!
 	pR.dilutedRollbackEstimatedDtNanos = int64(float64(pR.RollbackEstimatedDtNanos) * float64(pR.ServerFps) / dilutedServerFps)
-	pR.BattleDurationFrames = 30 * pR.ServerFps
+	pR.BattleDurationFrames = 90 * pR.ServerFps
 	pR.BattleDurationNanos = int64(pR.BattleDurationFrames) * (pR.RollbackEstimatedDtNanos + 1)
 	pR.InputFrameUpsyncDelayTolerance = 2
 	pR.MaxChasingRenderFramesPerUpdate = 8
@@ -760,7 +760,7 @@ func (pR *Room) OnDismissed() {
 	pR.MeleeSkillConfig[punchSkillId] = &MeleeBullet{
 		// for offender
 		StartupFrames:         int32(10),
-		ActiveFrames:          int32(3),
+		ActiveFrames:          int32(10),
 		RecoveryFrames:        int32(34),
 		RecoveryFramesOnBlock: int32(34),
 		RecoveryFramesOnHit:   int32(34),
@@ -770,7 +770,7 @@ func (pR *Room) OnDismissed() {
 		},
 		HitboxOffset: float64(12.0), // should be about the radius of the PlayerCollider
 		HitboxSize: &Vec2D{
-			X: float64(23.0),
+			X: float64(24.0),
 			Y: float64(32.0),
 		},
 
@@ -782,6 +782,12 @@ func (pR *Room) OnDismissed() {
 		Damage:             int32(5),
 	}
 
+	pR.SnapIntoPlatformOverlap = float64(0.1)
+	pR.SnapIntoPlatformThreshold = float64(0.5)
+	pR.JumpingInitVelY = int32(float64(7) * pR.WorldToVirtualGridRatio)
+	pR.GravityX = 0
+	pR.GravityY = -int32(float64(0.5) * pR.WorldToVirtualGridRatio) // makes all "playerCollider.Y" a multiple of 0.5 in all cases
+
 	pR.ChooseStage()
 	pR.EffectivePlayerCount = 0
 
@@ -826,10 +832,7 @@ func (pR *Room) OnPlayerDisconnected(playerId int32) {
 	if player, existent := pR.Players[playerId]; existent {
 		thatPlayerBattleState := atomic.LoadInt32(&(player.BattleState))
 		switch thatPlayerBattleState {
-		case PlayerBattleStateIns.DISCONNECTED:
+		case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
-		case PlayerBattleStateIns.LOST:
-		case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-		case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
 			Logger.Info("Room OnPlayerDisconnected[early return #1]:", zap.Any("playerId", playerId), zap.Any("playerBattleState", pR.Players[playerId].BattleState), zap.Any("roomId", pR.Id), zap.Any("nowRoomBattleState", pR.State), zap.Any("nowRoomEffectivePlayerCount", pR.EffectivePlayerCount))
 			return
 		}
@@ -976,6 +979,7 @@ func (pR *Room) OnPlayerBattleColliderAcked(playerId int32) bool {
 	case PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
 		shouldTryToStartBattle = false
 		atomic.StoreInt32(&(targetPlayer.BattleState), PlayerBattleStateIns.READDED_BATTLE_COLLIDER_ACKED)
+		Logger.Warn(fmt.Sprintf("OnPlayerBattleColliderAcked-reAdded: roomId=%v, roomState=%v, targetPlayerId=%v, targetPlayerBattleState=%v, capacity=%v, EffectivePlayerCount=%v", pR.Id, pR.State, targetPlayer.Id, targetPlayer.BattleState, pR.Capacity, pR.EffectivePlayerCount))
 	default:
 	}
 
@@ -1100,6 +1104,10 @@ func (pR *Room) markConfirmationIfApplicable(inputFrameUpsyncBatch []*InputFrame
 		}
 		targetInputFrameDownsync.InputList[player.JoinIndex-1] = inputFrameUpsync.Encoded
 		targetInputFrameDownsync.ConfirmedList |= uint64(1 << uint32(player.JoinIndex-1))
+
+		if inputFrameUpsync.InputFrameId > pR.LatestPlayerUpsyncedInputFrameId {
+			pR.LatestPlayerUpsyncedInputFrameId = inputFrameUpsync.InputFrameId
+		}
 	}
 
 	newAllConfirmedCount := int32(0)
@@ -1165,31 +1173,40 @@ func (pR *Room) forceConfirmationIfApplicable(prevRenderFrameId int32) *InputsBu
 	// [WARNING] This function MUST BE called while "pR.InputsBufferLock" is locked!
 	// Force confirmation of non-all-confirmed inputFrame EXACTLY ONE AT A TIME, returns the non-confirmed mask of players, e.g. in a 4-player-battle returning 1001 means that players with JoinIndex=1 and JoinIndex=4 are non-confirmed for inputFrameId2
 
-	renderFrameId1 := (pR.RenderFrameId - pR.NstDelayFrames) // the renderFrameId which should've been rendered on frontend
+	inputFrameId2 := int32(-1)
-	if 0 > renderFrameId1 {
+	if pR.LatestPlayerUpsyncedInputFrameId > (pR.LastAllConfirmedInputFrameId + (pR.NstDelayFrames >> pR.InputScaleFrames)) {
-		return nil
+		// Type#1 check whether there's a significantly slow ticker among players
-	}
+		Logger.Warn(fmt.Sprintf("[type#1 forceConfirmation]For roomId=%d@renderFrameId=%d, curDynamicsRenderFrameId=%d, LatestPlayerUpsyncedInputFrameId:%d, LastAllConfirmedInputFrameId:%d, (pR.NstDelayFrames >> pR.InputScaleFrames):%d; there's a slow ticker suspect, forcing all-confirmation", pR.Id, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, pR.LatestPlayerUpsyncedInputFrameId, pR.LastAllConfirmedInputFrameId, (pR.NstDelayFrames >> pR.InputScaleFrames)))
-	ok := false
+		inputFrameId2 = pR.LastAllConfirmedInputFrameId + 1
-	renderFrameId2 := int32(-1)
+	} else {
-	if ok, renderFrameId2 = pR.shouldPrefabInputFrameDownsync(prevRenderFrameId-pR.NstDelayFrames, renderFrameId1); !ok {
+		// Type#2 check whether there's a significantly slow ticker w.r.t. BackendDynamics, this applies when all players are disconnected temporarily
-		/*
+		renderFrameId1 := (pR.RenderFrameId - pR.NstDelayFrames) // the "renderFrameId" which should've been rendered on frontend
-		   The backend "shouldPrefabInputFrameDownsync" shares the same rule as frontend "shouldGenerateInputFrameUpsync".
+		if 0 > renderFrameId1 {
+			// Battle is still in an early stage, no action needed even if there were slow tickers
+			return nil
+		}
+		if ok, renderFrameId2 := pR.shouldPrefabInputFrameDownsync(prevRenderFrameId-pR.NstDelayFrames, renderFrameId1); ok {
+			/*
+			   The backend "shouldPrefabInputFrameDownsync" shares the same rule as frontend "shouldGenerateInputFrameUpsync".
 
-		   It's also important that "forceConfirmationIfApplicable" is NOT EXECUTED for every renderFrame, such that when a player is forced to resync, it has some time, i.e. (1 << InputScaleFrames) renderFrames, to upsync again.
+			   It's also important that "forceConfirmationIfApplicable" is NOT EXECUTED for every renderFrame, such that when a player is forced to resync, it has some time, i.e. (1 << InputScaleFrames) renderFrames, to upsync again.
-		*/
+			*/
-		return nil
+			inputFrameId2 = pR.ConvertToInputFrameId(renderFrameId2, 0) // The inputFrame to force confirmation (if necessary)
+			if inputFrameId2 > pR.LastAllConfirmedInputFrameId {
+				Logger.Debug(fmt.Sprintf("[type#2 forceConfirmation]For roomId=%d@renderFrameId=%d, curDynamicsRenderFrameId=%d, renderFrameId1:%d, renderFrameId2:%d, NstDelayFrames:%d, inputFrameId2:%d, LastAllConfirmedInputFrameId:%d; there's a slow ticker suspect, forcing all-confirmation", pR.Id, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, renderFrameId1, renderFrameId2, pR.NstDelayFrames, inputFrameId2, pR.LastAllConfirmedInputFrameId))
+			}
+		}
 	}
 
-	inputFrameId2 := pR.ConvertToInputFrameId(renderFrameId2, 0) // The inputFrame to force confirmation (if necessary)
+	if pR.LastAllConfirmedInputFrameId >= inputFrameId2 {
-	if inputFrameId2 < pR.LastAllConfirmedInputFrameId {
+		// No need to force confirmation for either type
-		// No need to force confirmation, the inputFrames already arrived
+		Logger.Debug(fmt.Sprintf("inputFrameId2=%v is already all-confirmed for roomId=%v, no need to force confirmation", inputFrameId2, pR.Id))
-		Logger.Debug(fmt.Sprintf("inputFrameId2=%v is already all-confirmed for roomId=%v[type#1], no need to force confirmation of it", inputFrameId2, pR.Id))
 		return nil
 	}
 
 	tmp := pR.InputsBuffer.GetByFrameId(inputFrameId2)
 	if nil == tmp {
-		panic(fmt.Sprintf("inputFrameId2=%v doesn't exist for roomId=%v, this is abnormal because the server should prefab inputFrameDownsync in a most advanced pace, check the prefab logic! InputsBuffer=%v", inputFrameId2, pR.Id, pR.InputsBufferString(false)))
+		panic(fmt.Sprintf("For roomId=%d, inputFrameId2=%v doesn't exist, this is abnormal because the server should prefab inputFrameDownsync in a most advanced pace, check the prefab logic! InputsBuffer=%v", pR.Id, inputFrameId2, pR.InputsBufferString(false)))
 	}
 
 	totPlayerCnt := uint32(pR.Capacity)
@@ -1204,7 +1221,6 @@ func (pR *Room) forceConfirmationIfApplicable(prevRenderFrameId int32) *InputsBu
 
 	if 0 < unconfirmedMask {
 		// This condition should be rarely met!
-		nextDynamicsRenderFrameId := pR.ConvertToLastUsedRenderFrameId(pR.LastAllConfirmedInputFrameId, pR.InputDelayFrames)
 		/*
 		   Upon resynced on frontend, "refRenderFrameId" is now set to as advanced as possible, and it's the frontend's responsibility now to pave way for the "gap inputFrames"
 
@@ -1212,7 +1228,7 @@ func (pR *Room) forceConfirmationIfApplicable(prevRenderFrameId int32) *InputsBu
 
 		   Upon resync, it's still possible that "refRenderFrameId < frontend.chaserRenderFrameId" -- and this is allowed.
 		*/
-		refRenderFrameIdIfNeeded := nextDynamicsRenderFrameId - 1
+		refRenderFrameIdIfNeeded := pR.ConvertToLastUsedRenderFrameId(pR.LastAllConfirmedInputFrameId, pR.InputDelayFrames)
 		if 0 > refRenderFrameIdIfNeeded {
 			// Without a "refRenderFrame", there's no point to force confirmation, i.e. nothing to downsync to the "ACTIVE but slowly ticking frontend(s)"
 			return nil
@@ -1268,6 +1284,7 @@ func (pR *Room) applyInputFrameDownsyncDynamics(fromRenderFrameId int32, toRende
 
 // TODO: Write unit-test for this function to compare with its frontend counter part
 func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputFrame *InputFrameDownsync, currRenderFrame *RoomDownsyncFrame, collisionSysMap map[int32]*resolv.Object) *RoomDownsyncFrame {
+	topPadding, bottomPadding, leftPadding, rightPadding := pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap
 	// [WARNING] This function MUST BE called while "pR.InputsBufferLock" is locked!
 	nextRenderFramePlayers := make(map[int32]*PlayerDownsync, pR.Capacity)
 	// Make a copy first
@@ -1278,7 +1295,10 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 			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,
@@ -1293,30 +1313,111 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		}
 	}
 
-	toRet := &RoomDownsyncFrame{
+	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?
-		Id:             currRenderFrame.Id + 1,
+	effPushbacks := make([]Vec2D, pR.Capacity)
-		Players:        nextRenderFramePlayers,
+	hardPushbackNorms := make([][]Vec2D, pR.Capacity)
-		CountdownNanos: (pR.BattleDurationNanos - int64(currRenderFrame.Id)*pR.RollbackEstimatedDtNanos),
+
-		MeleeBullets:   make([]*MeleeBullet, 0), // Is there any better way to reduce malloc/free impact, e.g. smart prediction for fixed memory allocation?
+	// 1. Process player inputs
+	if nil != delayedInputFrame {
+		var delayedInputFrameForPrevRenderFrame *InputFrameDownsync = nil
+		tmp := pR.InputsBuffer.GetByFrameId(pR.ConvertToInputFrameId(currRenderFrame.Id-1, pR.InputDelayFrames))
+		if nil != tmp {
+			delayedInputFrameForPrevRenderFrame = tmp.(*InputFrameDownsync)
+		}
+		inputList := delayedInputFrame.InputList
+		for _, player := range pR.PlayersArr {
+			playerId := player.Id
+			joinIndex := player.JoinIndex
+			currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
+			if 0 < thatPlayerInNextFrame.FramesToRecover {
+				continue
+			}
+			decodedInput := pR.decodeInput(inputList[joinIndex-1])
+			prevBtnALevel, prevBtnBLevel := int32(0), int32(0)
+			if nil != delayedInputFrameForPrevRenderFrame {
+				prevDecodedInput := pR.decodeInput(delayedInputFrameForPrevRenderFrame.InputList[joinIndex-1])
+				prevBtnALevel = prevDecodedInput.BtnALevel
+				prevBtnBLevel = prevDecodedInput.BtnBLevel
+			}
+
+			if decodedInput.BtnBLevel > prevBtnBLevel {
+				characStateAlreadyInAir := false
+				if ATK_CHARACTER_STATE_INAIR_IDLE1 == thatPlayerInNextFrame.CharacterState || ATK_CHARACTER_STATE_INAIR_ATK1 == thatPlayerInNextFrame.CharacterState || ATK_CHARACTER_STATE_INAIR_ATKED1 == thatPlayerInNextFrame.CharacterState {
+					characStateAlreadyInAir = true
+				}
+				characStateIsInterruptWaivable := false
+				if ATK_CHARACTER_STATE_IDLE1 == thatPlayerInNextFrame.CharacterState || ATK_CHARACTER_STATE_WALKING == thatPlayerInNextFrame.CharacterState || ATK_CHARACTER_STATE_INAIR_IDLE1 == thatPlayerInNextFrame.CharacterState {
+					characStateIsInterruptWaivable = true
+				}
+				if !characStateAlreadyInAir && characStateIsInterruptWaivable {
+					thatPlayerInNextFrame.VelY = pR.JumpingInitVelY
+					// if 1 == currPlayerDownsync.JoinIndex {
+					// 	Logger.Info(fmt.Sprintf("playerId=%v, joinIndex=%v jumped at {renderFrame.id: %d, virtualX: %d, virtualY: %d, nextVelX: %d, nextVelY: %d, nextCharacterState=%d, inAir=%v}, delayedInputFrame.id=%d", playerId, joinIndex, currRenderFrame.Id, currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, thatPlayerInNextFrame.CharacterState, currPlayerDownsync.InAir, delayedInputFrame.InputFrameId))
+					// }
+				}
+			}
+
+			if decodedInput.BtnALevel > prevBtnALevel {
+				punchSkillId := int32(1)
+				punchConfig := pR.MeleeSkillConfig[punchSkillId]
+				var newMeleeBullet MeleeBullet = *punchConfig
+				newMeleeBullet.BattleLocalId = pR.BulletBattleLocalIdCounter
+				pR.BulletBattleLocalIdCounter += 1
+				newMeleeBullet.OffenderJoinIndex = joinIndex
+				newMeleeBullet.OffenderPlayerId = playerId
+				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
+				}
+				Logger.Debug(fmt.Sprintf("roomId=%v, playerId=%v triggered a rising-edge of btnA at currRenderFrame.id=%v, delayedInputFrame.id=%v", pR.Id, playerId, currRenderFrame.Id, delayedInputFrame.InputFrameId))
+
+			} else if decodedInput.BtnALevel < prevBtnALevel {
+				Logger.Debug(fmt.Sprintf("roomId=%v, playerId=%v triggered a falling-edge of btnA at currRenderFrame.id=%v, delayedInputFrame.id=%v", pR.Id, playerId, currRenderFrame.Id, delayedInputFrame.InputFrameId))
+			} else {
+				// No bullet trigger, process movement inputs
+				// Note that by now "0 == thatPlayerInNextFrame.FramesToRecover", we should change "CharacterState" to "WALKING" or "IDLE" depending on player inputs
+				if 0 != decodedInput.Dx || 0 != decodedInput.Dy {
+					thatPlayerInNextFrame.DirX = decodedInput.Dx
+					thatPlayerInNextFrame.DirY = decodedInput.Dy
+					thatPlayerInNextFrame.VelX = decodedInput.Dx * currPlayerDownsync.Speed
+					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_WALKING
+				} else {
+					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_IDLE1
+					thatPlayerInNextFrame.VelX = 0
+				}
+			}
+		}
 	}
 
-	bulletPushbacks := make([]Vec2D, pR.Capacity) // Guaranteed determinism regardless of traversal order
+	// 2. Process player movement
-	effPushbacks := make([]Vec2D, pR.Capacity)    // Guaranteed determinism regardless of traversal order
-
-	// Reset playerCollider position from the "virtual grid position"
 	for _, player := range pR.PlayersArr {
 		playerId := player.Id
 		joinIndex := player.JoinIndex
-		bulletPushbacks[joinIndex-1].X, bulletPushbacks[joinIndex-1].Y = float64(0), float64(0)
 		effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y = float64(0), float64(0)
-		currPlayerDownsync := currRenderFrame.Players[playerId]
-		newVx, newVy := currPlayerDownsync.VirtualGridX, currPlayerDownsync.VirtualGridY
 		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
 		playerCollider := collisionSysMap[collisionPlayerIndex]
-		playerCollider.X, playerCollider.Y = VirtualGridToPolygonColliderAnchorPos(newVx, newVy, player.ColliderRadius, player.ColliderRadius, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.VirtualGridToWorldRatio)
+		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
+		// Reset playerCollider position from the "virtual grid position"
+		newVx, newVy := currPlayerDownsync.VirtualGridX+currPlayerDownsync.VelX, currPlayerDownsync.VirtualGridY+currPlayerDownsync.VelY
+		if thatPlayerInNextFrame.VelY == pR.JumpingInitVelY {
+			newVy += thatPlayerInNextFrame.VelY
+		}
+
+		halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
+		playerCollider.X, playerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.VirtualGridToWorldRatio)
+		// Update in the collision system
+		playerCollider.Update()
+
+		if currPlayerDownsync.InAir {
+			thatPlayerInNextFrame.VelX += pR.GravityX
+			thatPlayerInNextFrame.VelY += pR.GravityY
+		}
 	}
 
-	// Check bullet-anything collisions first, because the pushbacks caused by bullets might later be reverted by player-barrier collision
+	// 3. Add bullet colliders into collision system
 	bulletColliders := make(map[int32]*resolv.Object, 0) // Will all be removed at the end of `applyInputFrameDownsyncDynamicsOnSingleRenderFrame` due to the need for being rollback-compatible
 	removedBulletsAtCurrFrame := make(map[int32]int32, 0)
 	for _, meleeBullet := range currRenderFrame.MeleeBullets {
@@ -1332,8 +1433,7 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 			}
 			offenderWx, offenderWy := VirtualGridToWorldPos(offender.VirtualGridX, offender.VirtualGridY, pR.VirtualGridToWorldRatio)
 			bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
-
+			newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "MeleeBullet")
-			newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "MeleeBullet")
 			newBulletCollider.Data = meleeBullet
 			pR.Space.Add(newBulletCollider)
 			collisionSysMap[collisionBulletIndex] = newBulletCollider
@@ -1343,6 +1443,97 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		}
 	}
 
+	// 4. Invoke collision system stepping (no-op for backend collision lib)
+
+	// 5. Calc pushbacks for each player (after its movement) w/o bullets
+	for _, player := range pR.PlayersArr {
+		joinIndex := player.JoinIndex
+		playerId := player.Id
+		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
+		playerCollider := collisionSysMap[collisionPlayerIndex]
+		playerShape := playerCollider.Shape.(*resolv.ConvexPolygon)
+		hardPushbackNorms[joinIndex-1] = pR.calcHardPushbacksNorms(playerCollider, playerShape, pR.SnapIntoPlatformOverlap, &(effPushbacks[joinIndex-1]))
+		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
+		fallStopping := false
+		possiblyFallStoppedOnAnotherPlayer := 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 *Barrier:
+					isBarrier = true
+				case *Player:
+					isAnotherPlayer = true
+				case *MeleeBullet:
+					isBullet = 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))
+				landedOnGravityPushback := (pR.SnapIntoPlatformThreshold < normAlignmentWithGravity) // prevents false snapping on the lateral sides
+				if landedOnGravityPushback {
+					// kindly note that one player might land on top of another player, and snapping is also required in such case
+					pushbackX, pushbackY = (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapX, (overlapResult.Overlap-pR.SnapIntoPlatformOverlap)*overlapResult.OverlapY
+					thatPlayerInNextFrame.InAir = false
+				}
+				if isAnotherPlayer {
+					// [WARNING] See comments of this substep in frontend.
+					pushbackX, pushbackY = (overlapResult.Overlap-pR.SnapIntoPlatformOverlap*2)*overlapResult.OverlapX, (overlapResult.Overlap-pR.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 currPlayerDownsync.InAir && landedOnGravityPushback {
+					fallStopping = true
+					if isAnotherPlayer {
+						possiblyFallStoppedOnAnotherPlayer = true
+					}
+				}
+				if 1 == joinIndex {
+					halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
+					if fallStopping {
+						Logger.Debug(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#1\n{renderFrame.id: %d, possiblyFallStoppedOnAnotherPlayer: %v}\nplayerColliderPos=%v, effPushback={%.3f, %.3f}, overlapMag=%.4f", playerId, joinIndex, currRenderFrame.Id, possiblyFallStoppedOnAnotherPlayer, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap))
+					} else if currPlayerDownsync.InAir && isBarrier && !landedOnGravityPushback {
+						//Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by barrier & not landed at {renderFrame.id: %d}\nplayerColliderPos=%v, effPushback={%.3f, %.3f}, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, overlapResult.Overlap, len(hardPushbackNorms)))
+					} else if currPlayerDownsync.InAir && isAnotherPlayer {
+						//Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d inAir & pushed back by another player\n{renderFrame.id: %d}\nplayerColliderPos=%v, anotherPlayerColliderPos=%v, effPushback={%.3f, %.3f}, landedOnGravityPushback=%v, fallStopping=%v, overlapMag=%.4f, len(hardPushbackNorms)=%d", playerId, joinIndex, currRenderFrame.Id, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), RectCenterStr(obj, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y, landedOnGravityPushback, fallStopping, overlapResult.Overlap, len(hardPushbackNorms)))
+					}
+				}
+			}
+		}
+		if 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
+			}
+		}
+	}
+
+	// 6. Check bullet-anything collisions
 	for _, bulletCollider := range bulletColliders {
 		shouldRemove := false
 		meleeBullet := bulletCollider.Data.(*MeleeBullet)
@@ -1356,15 +1547,32 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 				case *Player:
 					if meleeBullet.OffenderPlayerId != t.Id {
 						if overlapped, _, _, _ := CalcPushbacks(0, 0, bulletShape, defenderShape); overlapped {
+							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)
 							}
-							bulletPushbacks[t.JoinIndex-1].X += xfac * meleeBullet.Pushback
+							pushbackX, pushbackY := -xfac*meleeBullet.Pushback, float64(0)
-							nextRenderFramePlayers[t.Id].CharacterState = ATK_CHARACTER_STATE_ATKED1
+
+							for _, hardPushbackNorm := range hardPushbackNorms[joinIndex-1] {
+								projectedMagnitude := pushbackX*hardPushbackNorm.X + pushbackY*hardPushbackNorm.Y
+								if 0 > projectedMagnitude {
+									Logger.Info(fmt.Sprintf("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.Players[t.Id], nextRenderFramePlayers[t.Id]
+							atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_ATKED1
+							if atkedPlayerInCurFrame.InAir {
+								atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_INAIR_ATKED1
+							}
 							oldFramesToRecover := nextRenderFramePlayers[t.Id].FramesToRecover
 							if meleeBullet.HitStunFrames > oldFramesToRecover {
-								nextRenderFramePlayers[t.Id].FramesToRecover = meleeBullet.HitStunFrames
+								atkedPlayerInNextFrame.FramesToRecover = meleeBullet.HitStunFrames
 							}
 							Logger.Debug(fmt.Sprintf("roomId=%v, a meleeBullet collides w/ player at currRenderFrame.id=%v: b=%v, p=%v", pR.Id, currRenderFrame.Id, ConvexPolygonStr(bulletShape), ConvexPolygonStr(defenderShape)))
 						}
@@ -1380,6 +1588,7 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		}
 	}
 
+	// [WARNING] Remove bullets from collisionSys ANYWAY for the convenience of rollback
 	for _, meleeBullet := range currRenderFrame.MeleeBullets {
 		collisionBulletIndex := COLLISION_BULLET_INDEX_PREFIX + meleeBullet.BattleLocalId
 		if bulletCollider, existent := collisionSysMap[collisionBulletIndex]; existent {
@@ -1389,124 +1598,48 @@ func (pR *Room) applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputF
 		if _, existent := removedBulletsAtCurrFrame[collisionBulletIndex]; existent {
 			continue
 		}
-		toRet.MeleeBullets = append(toRet.MeleeBullets, meleeBullet)
+		nextRenderFrameMeleeBullets = append(nextRenderFrameMeleeBullets, meleeBullet)
 	}
 
-	if nil != delayedInputFrame {
+	// 7. Get players out of stuck barriers if there's any
-		var delayedInputFrameForPrevRenderFrame *InputFrameDownsync = nil
+	for _, player := range pR.PlayersArr {
-		tmp := pR.InputsBuffer.GetByFrameId(pR.ConvertToInputFrameId(currRenderFrame.Id-1, pR.InputDelayFrames))
+		joinIndex := player.JoinIndex
-		if nil != tmp {
+		playerId := player.Id
-			delayedInputFrameForPrevRenderFrame = tmp.(*InputFrameDownsync)
+		collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
-		}
+		playerCollider := collisionSysMap[collisionPlayerIndex]
-		inputList := delayedInputFrame.InputList
+		// Update "virtual grid position"
-		// Process player inputs
+		currPlayerDownsync, thatPlayerInNextFrame := currRenderFrame.Players[playerId], nextRenderFramePlayers[playerId]
-		for _, player := range pR.PlayersArr {
+		halfColliderWidth, halfColliderHeight := player.ColliderRadius, player.ColliderRadius+player.ColliderRadius // avoid multiplying
-			playerId := player.Id
+		thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY = PolygonColliderBLToVirtualGridPos(playerCollider.X-effPushbacks[joinIndex-1].X, playerCollider.Y-effPushbacks[joinIndex-1].Y, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.WorldToVirtualGridRatio)
-			joinIndex := player.JoinIndex
-			collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
-			playerCollider := collisionSysMap[collisionPlayerIndex]
-			thatPlayerInNextFrame := nextRenderFramePlayers[playerId]
-			if 0 < thatPlayerInNextFrame.FramesToRecover {
-				// No need to process inputs for this player, but there might be bullet pushbacks on this player
-				// Also note that in this case we keep "CharacterState" of this player from last render frame
-				playerCollider.X += bulletPushbacks[joinIndex-1].X
-				playerCollider.Y += bulletPushbacks[joinIndex-1].Y
-				// Update in the collision system
-				playerCollider.Update()
-				if 0 != bulletPushbacks[joinIndex-1].X || 0 != bulletPushbacks[joinIndex-1].Y {
-					Logger.Debug(fmt.Sprintf("roomId=%v, playerId=%v is pushed back by (%.2f, %.2f) by bullet impacts, now its framesToRecover is %d at currRenderFrame.id=%v", pR.Id, playerId, bulletPushbacks[joinIndex-1].X, bulletPushbacks[joinIndex-1].Y, thatPlayerInNextFrame.FramesToRecover, currRenderFrame.Id))
-				}
-				continue
-			}
-			currPlayerDownsync := currRenderFrame.Players[playerId]
-			decodedInput := pR.decodeInput(inputList[joinIndex-1])
-			prevBtnALevel := int32(0)
-			if nil != delayedInputFrameForPrevRenderFrame {
-				prevDecodedInput := pR.decodeInput(delayedInputFrameForPrevRenderFrame.InputList[joinIndex-1])
-				prevBtnALevel = prevDecodedInput.BtnALevel
-			}
 
-			if decodedInput.BtnALevel > prevBtnALevel {
+		if 1 == thatPlayerInNextFrame.JoinIndex {
-				punchSkillId := int32(1)
+			if currPlayerDownsync.InAir && !thatPlayerInNextFrame.InAir {
-				punchConfig := pR.MeleeSkillConfig[punchSkillId]
+				//Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d fallStopping#2:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
-				var newMeleeBullet MeleeBullet = *punchConfig
+			} else if !currPlayerDownsync.InAir && thatPlayerInNextFrame.InAir {
-				newMeleeBullet.BattleLocalId = pR.BulletBattleLocalIdCounter
+				//Logger.Warn(fmt.Sprintf("playerId=%d, joinIndex=%d took off:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
-				pR.BulletBattleLocalIdCounter += 1
+			} else if thatPlayerInNextFrame.InAir && (0 != thatPlayerInNextFrame.VelY) {
-				newMeleeBullet.OffenderJoinIndex = joinIndex
+				//Logger.Info(fmt.Sprintf("playerId=%d, joinIndex=%d inAir trajectory:\n{nextRenderFrame.id: %d, nextVirtualX: %d, nextVirtualY: %d, nextVelX: %d, nextVelY: %d}\n\tcalculated from <- playerColliderPos=%v, effPushback={%.3f, %.3f}", playerId, joinIndex, currRenderFrame.Id+1, thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY, thatPlayerInNextFrame.VelX, thatPlayerInNextFrame.VelY, RectCenterStr(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY), effPushbacks[joinIndex-1].X, effPushbacks[joinIndex-1].Y))
-				newMeleeBullet.OffenderPlayerId = playerId
-				newMeleeBullet.OriginatedRenderFrameId = currRenderFrame.Id
-				toRet.MeleeBullets = append(toRet.MeleeBullets, &newMeleeBullet)
-				thatPlayerInNextFrame.FramesToRecover = newMeleeBullet.RecoveryFrames
-				thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_ATK1
-				Logger.Debug(fmt.Sprintf("roomId=%v, playerId=%v triggered a rising-edge of btnA at currRenderFrame.id=%v, delayedInputFrame.id=%v", pR.Id, playerId, currRenderFrame.Id, delayedInputFrame.InputFrameId))
-
-			} else if decodedInput.BtnALevel < prevBtnALevel {
-				Logger.Debug(fmt.Sprintf("roomId=%v, playerId=%v triggered a falling-edge of btnA at currRenderFrame.id=%v, delayedInputFrame.id=%v", pR.Id, playerId, currRenderFrame.Id, delayedInputFrame.InputFrameId))
-			} else {
-				// No bullet trigger, process movement inputs
-				// Note that by now "0 == thatPlayerInNextFrame.FramesToRecover", we should change "CharacterState" to "WALKING" or "IDLE" depending on player inputs
-				if 0 != decodedInput.Dx || 0 != decodedInput.Dy {
-					thatPlayerInNextFrame.DirX = decodedInput.Dx
-					thatPlayerInNextFrame.DirY = decodedInput.Dy
-					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_WALKING
-				} else {
-					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_IDLE1
-				}
-			}
-
-			movementX, movementY := VirtualGridToWorldPos(decodedInput.Dx+decodedInput.Dx*currPlayerDownsync.Speed, decodedInput.Dy+decodedInput.Dy*currPlayerDownsync.Speed, pR.VirtualGridToWorldRatio)
-			playerCollider.X += movementX
-			playerCollider.Y += movementY
-
-			// Update in the collision system
-			playerCollider.Update()
-		}
-
-		// handle pushbacks upon collision after all movements treated as simultaneous
-		for _, player := range pR.PlayersArr {
-			joinIndex := player.JoinIndex
-			collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
-			playerCollider := collisionSysMap[collisionPlayerIndex]
-			if collision := playerCollider.Check(0, 0); collision != nil {
-				playerShape := playerCollider.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.Debug(fmt.Sprintf("Overlapped: a=%v, b=%v, pushbackX=%v, pushbackY=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(barrierShape), pushbackX, pushbackY))
-						effPushbacks[joinIndex-1].X += pushbackX
-						effPushbacks[joinIndex-1].Y += pushbackY
-					} else {
-						Logger.Debug(fmt.Sprintf("Collided BUT not overlapped: a=%v, b=%v, overlapResult=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(barrierShape), overlapResult))
-					}
-				}
 			}
 		}
-
-		for _, player := range pR.PlayersArr {
-			playerId := player.Id
-			joinIndex := player.JoinIndex
-			collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
-			playerCollider := collisionSysMap[collisionPlayerIndex]
-
-			// Update "virtual grid position"
-			newVx, newVy := PolygonColliderAnchorToVirtualGridPos(playerCollider.X-effPushbacks[joinIndex-1].X, playerCollider.Y-effPushbacks[joinIndex-1].Y, player.ColliderRadius, player.ColliderRadius, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, pR.WorldToVirtualGridRatio)
-			thatPlayerInNextFrame := nextRenderFramePlayers[playerId]
-			thatPlayerInNextFrame.VirtualGridX, thatPlayerInNextFrame.VirtualGridY = newVx, newVy
-		}
-
-		Logger.Debug(fmt.Sprintf("After applyInputFrameDownsyncDynamicsOnSingleRenderFrame: currRenderFrame.Id=%v, inputList=%v, currRenderFrame.Players=%v, nextRenderFramePlayers=%v", currRenderFrame.Id, inputList, currRenderFrame.Players, nextRenderFramePlayers))
 	}
 
-	return toRet
+	return &RoomDownsyncFrame{
+		Id:             currRenderFrame.Id + 1,
+		Players:        nextRenderFramePlayers,
+		MeleeBullets:   nextRenderFrameMeleeBullets,
+		CountdownNanos: (pR.BattleDurationNanos - int64(currRenderFrame.Id)*pR.RollbackEstimatedDtNanos),
+	}
 }
 
 func (pR *Room) 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,
 	}
 }
 
@@ -1517,12 +1650,14 @@ func (pR *Room) inputFrameIdDebuggable(inputFrameId int32) bool {
 func (pR *Room) refreshColliders(spaceW, spaceH int32) {
 	// Kindly note that by now, we've already got all the shapes in the tmx file into "pR.(Players | Barriers)" from "ParseTmxLayersAndGroups"
 
-	minStep := (int(float64(pR.PlayerDefaultSpeed)*pR.VirtualGridToWorldRatio) << 1) // the approx minimum distance a player can move per frame in world coordinate
+	topPadding, bottomPadding, leftPadding, rightPadding := pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap, pR.SnapIntoPlatformOverlap
+
+	minStep := (int(float64(pR.PlayerDefaultSpeed)*pR.VirtualGridToWorldRatio) << 2) // the approx minimum distance a player can move per frame in world coordinate
 	pR.Space = resolv.NewSpace(int(spaceW), int(spaceH), minStep, minStep)           // allocate a new collision space everytime after a battle is settled
 	for _, player := range pR.Players {
 		wx, wy := VirtualGridToWorldPos(player.VirtualGridX, player.VirtualGridY, pR.VirtualGridToWorldRatio)
-		colliderWidth, colliderHeight := player.ColliderRadius*2, player.ColliderRadius*3
+		colliderWidth, colliderHeight := player.ColliderRadius*2, player.ColliderRadius*4
-		playerCollider := GenerateRectCollider(wx, wy, colliderWidth, colliderHeight, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "Player")
+		playerCollider := GenerateRectCollider(wx, wy, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "Player") // the coords of all barrier boundaries are multiples of tileWidth(i.e. 16), by adding snapping y-padding when "landedOnGravityPushback" all "playerCollider.Y" would be a multiple of 1.0
 		playerCollider.Data = player
 		pR.Space.Add(playerCollider)
 		// Keep track of the collider in "pR.CollisionSysMap"
@@ -1535,6 +1670,7 @@ func (pR *Room) refreshColliders(spaceW, spaceH int32) {
 	for _, barrier := range pR.Barriers {
 		boundaryUnaligned := barrier.Boundary
 		barrierCollider := GenerateConvexPolygonCollider(boundaryUnaligned, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY, "Barrier")
+		barrierCollider.Data = barrier
 		pR.Space.Add(barrierCollider)
 	}
 }
@@ -1566,7 +1702,7 @@ func (pR *Room) doBattleMainLoopPerTickBackendDynamicsWithProperLocking(prevRend
 	if 0 <= pR.LastAllConfirmedInputFrameId {
 		dynamicsStartedAt := utils.UnixtimeNano()
 		// Apply "all-confirmed inputFrames" to move forward "pR.CurDynamicsRenderFrameId"
-		nextDynamicsRenderFrameId := pR.ConvertToLastUsedRenderFrameId(pR.LastAllConfirmedInputFrameId, pR.InputDelayFrames)
+		nextDynamicsRenderFrameId := pR.ConvertToLastUsedRenderFrameId(pR.LastAllConfirmedInputFrameId, pR.InputDelayFrames) + 1
 		Logger.Debug(fmt.Sprintf("roomId=%v, room.RenderFrameId=%v, room.CurDynamicsRenderFrameId=%v, LastAllConfirmedInputFrameId=%v, InputDelayFrames=%v, nextDynamicsRenderFrameId=%v", pR.Id, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, pR.LastAllConfirmedInputFrameId, pR.InputDelayFrames, nextDynamicsRenderFrameId))
 		pR.applyInputFrameDownsyncDynamics(pR.CurDynamicsRenderFrameId, nextDynamicsRenderFrameId, pR.collisionSpaceOffsetX, pR.collisionSpaceOffsetY)
 		*pDynamicsDuration = utils.UnixtimeNano() - dynamicsStartedAt
@@ -1580,53 +1716,91 @@ func (pR *Room) doBattleMainLoopPerTickBackendDynamicsWithProperLocking(prevRend
 
 func (pR *Room) downsyncToAllPlayers(inputsBufferSnapshot *InputsBufferSnapshot) {
 	/*
-			   [WARNING] This function MUST BE called while "pR.InputsBufferLock" is locked for preserving the order of generation of "inputsBufferSnapshot" -- see comments in "OnBattleCmdReceived" and [this issue](https://github.com/genxium/DelayNoMore/issues/12).
+		       [WARNING] This function MUST BE called while "pR.InputsBufferLock" is LOCKED to **preserve the order of generation of "inputsBufferSnapshot" for sending** -- see comments in "OnBattleCmdReceived" and [this issue](https://github.com/genxium/DelayNoMore/issues/12).
 
 		       Actually if each player session were both intrinsically thread-safe & non-blocking for writing (like Java NIO), I could've just called "playerSession.WriteMessage" while holding "pR.InputsBufferLock" -- but the ws session provided by Gorilla library is neither thread-safe nor non-blocking for writing, which is fine because it creates a chance for the users to solve an interesting problem :)
+
+			   Moreover, we're downsyncing a same "inputsBufferSnapshot" for all players in the same battle and this is by design, i.e. not respecting "player.LastSentInputFrameId" because "new all-confirmed inputFrameDownsyncs" are the same for all players and ws is TCP-based (no loss of consecutive packets except for reconnection -- which is already handled by READDED_BATTLE_COLLIDER_ACKED)
+
+		       Lastly noting just for fun, if in "OnBattleCmdReceived" we need downsync to a single specific player (keeping **the order of generation of "inputsBufferSnapshot" preserved for sending** of course), in theory it's better to do it by the following order.
+		       1. lock "InputsBuffer";
+		       2. generate downsync msg;
+		       3. lock "pR.PlayerDownsyncChanDict[playerId]";
+		       4. put downsync msg to "pR.PlayerDownsyncChanDict[playerId]";
+		       5. unlock "InputsBuffer";
+		       6. now other threads are allowed to lock "inputsBuffer", and we can do "other things" on "pR.PlayerDownsyncChanDict[playerId]";
+		       7. unlock "pR.PlayerDownsyncChanDict[playerId]".
+
+		       The difference from our current approach is that the "pR.PlayerDownsyncChanDict[playerId]" in use is a Golang channel, i.e. when executing #4 it automatically executes #3 (before) & #7 (after) as well, thus we couldn't do #5 & #6 in between.
 	*/
-	/*
+	if true == pR.BackendDynamicsEnabled {
-	   Moreover, we're downsyncing a same "inputsBufferSnapshot" for all players in the same battle and this is by design, i.e. not respecting "player.LastSentInputFrameId" because "new all-confirmed inputFrameDownsyncs" are the same for all players and ws is TCP-based (no loss of consecutive packets except for reconnection -- which is already handled by READDED_BATTLE_COLLIDER_ACKED)
+		for _, player := range pR.PlayersArr {
-	*/
+			/*
-	for playerId, playerDownsyncChan := range pR.PlayerDownsyncChanDict {
+			   [WARNING] Since v0.9.1, the inconsistence between frontend & backend collision handling results became too difficult to track, therefore before we can let frontend use a Golang compiled library for "applyInputFrameDownsyncDynamicsOnSingleRenderFrame", it's a compromise here to force resync for all players in a same room if any player recovered from a reconnection (when it's most likely for anyone to notice an inconsistence).
-		playerDownsyncChan <- (*inputsBufferSnapshot)
+
-		Logger.Debug(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d, playerDownsyncChan:%p)#1", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId, playerDownsyncChan))
+			   That said, we ensured that if "false == BackendDynamicsEnabled" and noone ever disconnects & reconnects, the frontend collision handling results are always consistent.
+			*/
+			playerBattleState := atomic.LoadInt32(&(player.BattleState))
+			thatPlayerJoinMask := uint64(1 << uint32(player.JoinIndex-1))
+			if PlayerBattleStateIns.READDED_BATTLE_COLLIDER_ACKED == playerBattleState {
+				inputsBufferSnapshot.ShouldForceResync = true
+				break
+			} else if PlayerBattleStateIns.ACTIVE == playerBattleState && 0 < (inputsBufferSnapshot.UnconfirmedMask&thatPlayerJoinMask) {
+				/*
+				   [WARNING] Whenever there's an ACTIVE SLOW TICKER, all players should also be resynced to avoid inconsistent display. See `<proj-root>/ConcerningEdgeCases.md` for more information.
+				*/
+				inputsBufferSnapshot.ShouldForceResync = true
+				break
+			}
+		}
+	}
+
+	for _, player := range pR.PlayersArr {
+		/*
+		   [WARNING] While the order of generation of "inputsBufferSnapshot" is preserved for sending, the underlying network I/O blocking action is dispatched to "downsyncLoop of each player" such that "markConfirmationIfApplicable & forceConfirmationIfApplicable" can re-hold "pR.InputsBufferLock" asap and proceed with more inputFrameUpsyncs.
+
+		   The use of "downsyncLoop of each player" also waives the need of guarding each "pR.PlayerDownsyncSessionDict[playerId]" from multithread-access (e.g. by a "pR.PlayerDownsyncSessionMutexDict[playerId]"), i.e. Gorilla v1.2.0 "conn.WriteMessage" isn't thread-safe https://github.com/gorilla/websocket/blob/v1.2.0/conn.go#L585.
+		*/
+		playerBattleState := atomic.LoadInt32(&(player.BattleState))
+		switch playerBattleState {
+		case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL, PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK, PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
+			continue
+		}
+
+		if playerDownsyncChan, existent := pR.PlayerDownsyncChanDict[player.Id]; existent {
+			playerDownsyncChan <- (*inputsBufferSnapshot)
+			//Logger.Info(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d, playerDownsyncChan:%p)#1", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, player.Id, playerDownsyncChan))
+		} else {
+			Logger.Warn(fmt.Sprintf("playerDownsyncChan for (roomId: %d, playerId:%d) is gone", pR.Id, player.Id))
+		}
 	}
 }
 
-func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRenderFrameId int32, unconfirmedMask uint64, toSendInputFrameDownsyncsSnapshot []*InputFrameDownsync) {
+func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRenderFrameId int32, unconfirmedMask uint64, toSendInputFrameDownsyncsSnapshot []*InputFrameDownsync, shouldForceResync bool) {
 	/*
-	   [WARNING] This function MUST BE called while "pR.InputsBufferLock" is unlocked -- otherwise the blocking "sendSafely" might cause significant lag!
+	   [WARNING] This function MUST BE called while "pR.InputsBufferLock" is unlocked -- otherwise the network I/O blocking of "sendSafely" might cause significant lag for "markConfirmationIfApplicable & forceConfirmationIfApplicable"!
-	   We hereby assume that Golang runtime allocates & frees small amount of RAM quickly enough compared to either network I/O worst cases or the high frequency "per inputFrameDownsync*player" locking (though "OnBattleCmdReceived" locks at the same frequency but it's inevitable).
+
+	   We hereby assume that Golang runtime allocates & frees small amount of RAM quickly enough compared to either network I/O blocking in worst cases or the high frequency "per inputFrameDownsync*player" locking (though "OnBattleCmdReceived" locks at the same frequency but it's inevitable).
 	*/
 
 	playerJoinIndex := player.JoinIndex - 1
 	playerBattleState := atomic.LoadInt32(&(player.BattleState))
 	switch playerBattleState {
-	case PlayerBattleStateIns.DISCONNECTED:
+	case PlayerBattleStateIns.DISCONNECTED, PlayerBattleStateIns.LOST, PlayerBattleStateIns.EXPELLED_DURING_GAME, PlayerBattleStateIns.EXPELLED_IN_DISMISSAL, PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK, PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
-	case PlayerBattleStateIns.LOST:
-	case PlayerBattleStateIns.EXPELLED_DURING_GAME:
-	case PlayerBattleStateIns.EXPELLED_IN_DISMISSAL:
-	case PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK:
-	case PlayerBattleStateIns.READDED_PENDING_BATTLE_COLLIDER_ACK:
 		return
 	}
 
 	shouldResync1 := (PlayerBattleStateIns.READDED_BATTLE_COLLIDER_ACKED == playerBattleState) // i.e. implies that "MAGIC_LAST_SENT_INPUT_FRAME_ID_READDED == player.LastSentInputFrameId"
 	shouldResync2 := (0 < (unconfirmedMask & uint64(1<<uint32(playerJoinIndex))))              // This condition is critical, if we don't send resync upon this condition, the "reconnected or slowly-clocking player" might never get its input synced
 	// shouldResync2 := (0 < unconfirmedMask) // An easier version of the above, might keep sending "refRenderFrame"s to still connected players when any player is disconnected
-	shouldResyncOverall := (shouldResync1 || shouldResync2)
+	shouldResync3 := shouldForceResync
-
+	shouldResyncOverall := (shouldResync1 || shouldResync2 || shouldResync3)
-	if shouldResyncOverall {
-		// A rejoined player, should guarantee that when it resyncs to "refRenderFrameId" a matching inputFrame to apply exists
-		Logger.Debug(fmt.Sprintf("Resyncing player: roomId=%v, playerId=%v, playerJoinIndex=%v, renderFrameId=%v, curDynamicsRenderFrameId=%v, playerLastSentInputFrameId=%v, refRenderFrameId=%v", pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, refRenderFrameId))
-	}
 
 	/*
 	   Resync helps
 	   1. when player with a slower frontend clock lags significantly behind and thus wouldn't get its inputUpsync recognized due to faster "forceConfirmation"
 	   2. reconnection
 	*/
-
 	toSendInputFrameIdSt, toSendInputFrameIdEd := toSendInputFrameDownsyncsSnapshot[0].InputFrameId, toSendInputFrameDownsyncsSnapshot[len(toSendInputFrameDownsyncsSnapshot)-1].InputFrameId+1
 	if pR.BackendDynamicsEnabled && shouldResyncOverall {
 		tmp := pR.RenderFrameBuffer.GetByFrameId(refRenderFrameId)
@@ -1638,9 +1812,15 @@ func (pR *Room) downsyncToSinglePlayer(playerId int32, player *Player, refRender
 		for _, player := range pR.PlayersArr {
 			refRenderFrame.Players[player.Id].ColliderRadius = player.ColliderRadius // hardcoded for now
 		}
+		if shouldResync3 {
+			refRenderFrame.ShouldForceResync = true
+		}
 		refRenderFrame.BackendUnconfirmedMask = unconfirmedMask
 		pR.sendSafely(refRenderFrame, toSendInputFrameDownsyncsSnapshot, DOWNSYNC_MSG_ACT_FORCED_RESYNC, playerId, false)
-		Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d: InputsBuffer=%v", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, pR.InputsBufferString(false)))
+		//Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d: InputsBuffer=%v", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, pR.InputsBufferString(false)))
+		if shouldResync1 {
+			Logger.Warn(fmt.Sprintf("Sent refRenderFrameId=%v & inputFrameIds [%d, %d), for roomId=%v, playerId=%d, playerJoinIndex=%d, renderFrameId=%d, curDynamicsRenderFrameId=%d, playerLastSentInputFrameId=%d: shouldResync1=%v, shouldResync2=%v, shouldResync3=%v, playerBattleState=%d", refRenderFrameId, toSendInputFrameIdSt, toSendInputFrameIdEd, pR.Id, playerId, player.JoinIndex, pR.RenderFrameId, pR.CurDynamicsRenderFrameId, player.LastSentInputFrameId, shouldResync1, shouldResync2, shouldResync3, playerBattleState))
+		}
 	} else {
 		pR.sendSafely(nil, toSendInputFrameDownsyncsSnapshot, DOWNSYNC_MSG_ACT_INPUT_BATCH, playerId, false)
 	}
@@ -1682,3 +1862,29 @@ func (pR *Room) cloneInputsBuffer(stFrameId, edFrameId int32) []*InputFrameDowns
 
 	return cloned
 }
+
+func (pR *Room) calcHardPushbacksNorms(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
+	}
+	for _, obj := range collision.Objects {
+		switch obj.Data.(type) {
+		case *Barrier:
+			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
+		default:
+		}
+	}
+	return ret
+}

battle_srv/protos/room_downsync_frame.pb.go

@@ -30,21 +30,24 @@ type PlayerDownsync struct {
 	VirtualGridX      int32   `protobuf:"varint,2,opt,name=virtualGridX,proto3" json:"virtualGridX,omitempty"`
 	VirtualGridY      int32   `protobuf:"varint,3,opt,name=virtualGridY,proto3" json:"virtualGridY,omitempty"`
 	DirX              int32   `protobuf:"varint,4,opt,name=dirX,proto3" json:"dirX,omitempty"`
-	DirY              int32   `protobuf:"varint,5,opt,name=dirY,proto3" json:"dirY,omitempty"`
+	DirY              int32   `protobuf:"varint,5,opt,name=dirY,proto3" json:"dirY,omitempty"` // "dirX" and "dirY" determines character facing
-	Speed             int32   `protobuf:"varint,6,opt,name=speed,proto3" json:"speed,omitempty"` // in terms of virtual grid units
+	VelX              int32   `protobuf:"varint,6,opt,name=velX,proto3" json:"velX,omitempty"`
-	BattleState       int32   `protobuf:"varint,7,opt,name=battleState,proto3" json:"battleState,omitempty"`
+	VelY              int32   `protobuf:"varint,7,opt,name=velY,proto3" json:"velY,omitempty"`   // "velX" and "velY" is used to record the accumulated effect by accelerations (including gravity)
-	JoinIndex         int32   `protobuf:"varint,8,opt,name=joinIndex,proto3" json:"joinIndex,omitempty"`
+	Speed             int32   `protobuf:"varint,8,opt,name=speed,proto3" json:"speed,omitempty"` // this is the instantaneous scalar attribute of a character, different from but will be accounted in "velX" and "velY"
-	ColliderRadius    float64 `protobuf:"fixed64,9,opt,name=colliderRadius,proto3" json:"colliderRadius,omitempty"`
+	BattleState       int32   `protobuf:"varint,9,opt,name=battleState,proto3" json:"battleState,omitempty"`
-	Removed           bool    `protobuf:"varint,10,opt,name=removed,proto3" json:"removed,omitempty"`
+	JoinIndex         int32   `protobuf:"varint,10,opt,name=joinIndex,proto3" json:"joinIndex,omitempty"`
-	Score             int32   `protobuf:"varint,11,opt,name=score,proto3" json:"score,omitempty"`
+	ColliderRadius    float64 `protobuf:"fixed64,11,opt,name=colliderRadius,proto3" json:"colliderRadius,omitempty"`
-	LastMoveGmtMillis int32   `protobuf:"varint,12,opt,name=lastMoveGmtMillis,proto3" json:"lastMoveGmtMillis,omitempty"`
+	Removed           bool    `protobuf:"varint,12,opt,name=removed,proto3" json:"removed,omitempty"`
-	FramesToRecover   int32   `protobuf:"varint,13,opt,name=framesToRecover,proto3" json:"framesToRecover,omitempty"`
+	Score             int32   `protobuf:"varint,13,opt,name=score,proto3" json:"score,omitempty"`
-	Hp                int32   `protobuf:"varint,14,opt,name=hp,proto3" json:"hp,omitempty"`
+	LastMoveGmtMillis int32   `protobuf:"varint,14,opt,name=lastMoveGmtMillis,proto3" json:"lastMoveGmtMillis,omitempty"`
-	MaxHp             int32   `protobuf:"varint,15,opt,name=maxHp,proto3" json:"maxHp,omitempty"`
+	FramesToRecover   int32   `protobuf:"varint,15,opt,name=framesToRecover,proto3" json:"framesToRecover,omitempty"`
-	CharacterState    int32   `protobuf:"varint,16,opt,name=characterState,proto3" json:"characterState,omitempty"`
+	Hp                int32   `protobuf:"varint,16,opt,name=hp,proto3" json:"hp,omitempty"`
-	Name              string  `protobuf:"bytes,17,opt,name=name,proto3" json:"name,omitempty"`
+	MaxHp             int32   `protobuf:"varint,17,opt,name=maxHp,proto3" json:"maxHp,omitempty"`
-	DisplayName       string  `protobuf:"bytes,18,opt,name=displayName,proto3" json:"displayName,omitempty"`
+	CharacterState    int32   `protobuf:"varint,18,opt,name=characterState,proto3" json:"characterState,omitempty"`
-	Avatar            string  `protobuf:"bytes,19,opt,name=avatar,proto3" json:"avatar,omitempty"`
+	InAir             bool    `protobuf:"varint,19,opt,name=inAir,proto3" json:"inAir,omitempty"` // 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)"
+	Name              string  `protobuf:"bytes,20,opt,name=name,proto3" json:"name,omitempty"`
+	DisplayName       string  `protobuf:"bytes,21,opt,name=displayName,proto3" json:"displayName,omitempty"`
+	Avatar            string  `protobuf:"bytes,22,opt,name=avatar,proto3" json:"avatar,omitempty"`
 }
 
 func (x *PlayerDownsync) Reset() {
@@ -114,6 +117,20 @@ func (x *PlayerDownsync) GetDirY() int32 {
 	return 0
 }
 
+func (x *PlayerDownsync) GetVelX() int32 {
+	if x != nil {
+		return x.VelX
+	}
+	return 0
+}
+
+func (x *PlayerDownsync) GetVelY() int32 {
+	if x != nil {
+		return x.VelY
+	}
+	return 0
+}
+
 func (x *PlayerDownsync) GetSpeed() int32 {
 	if x != nil {
 		return x.Speed
@@ -191,6 +208,13 @@ func (x *PlayerDownsync) GetCharacterState() int32 {
 	return 0
 }
 
+func (x *PlayerDownsync) GetInAir() bool {
+	if x != nil {
+		return x.InAir
+	}
+	return false
+}
+
 func (x *PlayerDownsync) GetName() string {
 	if x != nil {
 		return x.Name
@@ -220,6 +244,7 @@ type InputFrameDecoded struct {
 	Dx        int32 `protobuf:"varint,1,opt,name=dx,proto3" json:"dx,omitempty"`
 	Dy        int32 `protobuf:"varint,2,opt,name=dy,proto3" json:"dy,omitempty"`
 	BtnALevel int32 `protobuf:"varint,3,opt,name=btnALevel,proto3" json:"btnALevel,omitempty"`
+	BtnBLevel int32 `protobuf:"varint,4,opt,name=btnBLevel,proto3" json:"btnBLevel,omitempty"`
 }
 
 func (x *InputFrameDecoded) Reset() {
@@ -275,6 +300,13 @@ func (x *InputFrameDecoded) GetBtnALevel() int32 {
 	return 0
 }
 
+func (x *InputFrameDecoded) GetBtnBLevel() int32 {
+	if x != nil {
+		return x.BtnBLevel
+	}
+	return 0
+}
+
 type InputFrameUpsync struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -638,6 +670,7 @@ type InputsBufferSnapshot struct {
 	RefRenderFrameId          int32                 `protobuf:"varint,1,opt,name=refRenderFrameId,proto3" json:"refRenderFrameId,omitempty"`
 	UnconfirmedMask           uint64                `protobuf:"varint,2,opt,name=unconfirmedMask,proto3" json:"unconfirmedMask,omitempty"`
 	ToSendInputFrameDownsyncs []*InputFrameDownsync `protobuf:"bytes,3,rep,name=toSendInputFrameDownsyncs,proto3" json:"toSendInputFrameDownsyncs,omitempty"`
+	ShouldForceResync         bool                  `protobuf:"varint,4,opt,name=shouldForceResync,proto3" json:"shouldForceResync,omitempty"`
 }
 
 func (x *InputsBufferSnapshot) Reset() {
@@ -693,6 +726,13 @@ func (x *InputsBufferSnapshot) GetToSendInputFrameDownsyncs() []*InputFrameDowns
 	return nil
 }
 
+func (x *InputsBufferSnapshot) GetShouldForceResync() bool {
+	if x != nil {
+		return x.ShouldForceResync
+	}
+	return false
+}
+
 type MeleeBullet struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -901,6 +941,11 @@ type BattleColliderInfo struct {
 	SpAtkLookupFrames               int32                                  `protobuf:"varint,25,opt,name=spAtkLookupFrames,proto3" json:"spAtkLookupFrames,omitempty"`
 	RenderCacheSize                 int32                                  `protobuf:"varint,26,opt,name=renderCacheSize,proto3" json:"renderCacheSize,omitempty"`
 	MeleeSkillConfig                map[int32]*MeleeBullet                 `protobuf:"bytes,27,rep,name=meleeSkillConfig,proto3" json:"meleeSkillConfig,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"` // skillId -> skill
+	SnapIntoPlatformOverlap         float64                                `protobuf:"fixed64,28,opt,name=snapIntoPlatformOverlap,proto3" json:"snapIntoPlatformOverlap,omitempty"`
+	SnapIntoPlatformThreshold       float64                                `protobuf:"fixed64,29,opt,name=snapIntoPlatformThreshold,proto3" json:"snapIntoPlatformThreshold,omitempty"`
+	JumpingInitVelY                 int32                                  `protobuf:"varint,30,opt,name=jumpingInitVelY,proto3" json:"jumpingInitVelY,omitempty"`
+	GravityX                        int32                                  `protobuf:"varint,31,opt,name=gravityX,proto3" json:"gravityX,omitempty"`
+	GravityY                        int32                                  `protobuf:"varint,32,opt,name=gravityY,proto3" json:"gravityY,omitempty"`
 }
 
 func (x *BattleColliderInfo) Reset() {
@@ -1117,6 +1162,41 @@ func (x *BattleColliderInfo) GetMeleeSkillConfig() map[int32]*MeleeBullet {
 	return nil
 }
 
+func (x *BattleColliderInfo) GetSnapIntoPlatformOverlap() float64 {
+	if x != nil {
+		return x.SnapIntoPlatformOverlap
+	}
+	return 0
+}
+
+func (x *BattleColliderInfo) GetSnapIntoPlatformThreshold() float64 {
+	if x != nil {
+		return x.SnapIntoPlatformThreshold
+	}
+	return 0
+}
+
+func (x *BattleColliderInfo) GetJumpingInitVelY() int32 {
+	if x != nil {
+		return x.JumpingInitVelY
+	}
+	return 0
+}
+
+func (x *BattleColliderInfo) GetGravityX() int32 {
+	if x != nil {
+		return x.GravityX
+	}
+	return 0
+}
+
+func (x *BattleColliderInfo) GetGravityY() int32 {
+	if x != nil {
+		return x.GravityY
+	}
+	return 0
+}
+
 type RoomDownsyncFrame struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1127,6 +1207,7 @@ type RoomDownsyncFrame struct {
 	CountdownNanos         int64                     `protobuf:"varint,3,opt,name=countdownNanos,proto3" json:"countdownNanos,omitempty"`
 	MeleeBullets           []*MeleeBullet            `protobuf:"bytes,4,rep,name=meleeBullets,proto3" json:"meleeBullets,omitempty"`                      // 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
 	BackendUnconfirmedMask uint64                    `protobuf:"varint,5,opt,name=backendUnconfirmedMask,proto3" json:"backendUnconfirmedMask,omitempty"` // Indexed by "joinIndex", same compression concern as stated in InputFrameDownsync
+	ShouldForceResync      bool                      `protobuf:"varint,6,opt,name=shouldForceResync,proto3" json:"shouldForceResync,omitempty"`
 }
 
 func (x *RoomDownsyncFrame) Reset() {
@@ -1196,13 +1277,20 @@ func (x *RoomDownsyncFrame) GetBackendUnconfirmedMask() uint64 {
 	return 0
 }
 
+func (x *RoomDownsyncFrame) GetShouldForceResync() bool {
+	if x != nil {
+		return x.ShouldForceResync
+	}
+	return false
+}
+
 var File_room_downsync_frame_proto protoreflect.FileDescriptor
 
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 }
 
 var (

battle_srv/ws/serve.go

@@ -265,9 +265,14 @@ func Serve(c *gin.Context) {
 			WorldToVirtualGridRatio: pRoom.WorldToVirtualGridRatio,
 			VirtualGridToWorldRatio: pRoom.VirtualGridToWorldRatio,
 
-			SpAtkLookupFrames: pRoom.SpAtkLookupFrames,
+			SpAtkLookupFrames:         pRoom.SpAtkLookupFrames,
-			RenderCacheSize:   pRoom.RenderCacheSize,
+			RenderCacheSize:           pRoom.RenderCacheSize,
-			MeleeSkillConfig:  pRoom.MeleeSkillConfig,
+			MeleeSkillConfig:          pRoom.MeleeSkillConfig,
+			SnapIntoPlatformOverlap:   pRoom.SnapIntoPlatformOverlap,
+			SnapIntoPlatformThreshold: pRoom.SnapIntoPlatformThreshold,
+			JumpingInitVelY:           pRoom.JumpingInitVelY,
+			GravityX:                  pRoom.GravityX,
+			GravityY:                  pRoom.GravityY,
 		}
 
 		resp := &pb.WsResp{

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.

collider_visualizer/worldColliderDisplay.go

@@ -34,15 +34,19 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 	spaceOffsetX := float64(spaceW) * 0.5
 	spaceOffsetY := float64(spaceH) * 0.5
 
-	virtualGridToWorldRatio := 0.1
+	worldToVirtualGridRatio := float64(1000)
-	playerDefaultSpeed := 20
+	virtualGridToWorldRatio := float64(1) / worldToVirtualGridRatio
-	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 2)
+	playerDefaultSpeed := 1 * worldToVirtualGridRatio
-	playerColliderRadius := float64(24)
+	minStep := (int(float64(playerDefaultSpeed)*virtualGridToWorldRatio) << 3)
+	playerColliderRadius := float64(12)
 	playerColliders := make([]*resolv.Object, len(playerPosList.Eles))
+	snapIntoPlatformOverlap := float64(0.1)
 	space := resolv.NewSpace(int(spaceW), int(spaceH), minStep, minStep)
+	topPadding, bottomPadding, leftPadding, rightPadding := snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap, snapIntoPlatformOverlap
 	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"
+		colliderWidth, colliderHeight := playerColliderRadius*2, playerColliderRadius*4
-		Logger.Info(fmt.Sprintf("Player Collider#%d: player world pos =(%.2f, %.2f), shape=%v", i, playerPos.X, playerPos.Y, ConvexPolygonStr(playerCollider.Shape.(*resolv.ConvexPolygon))))
+		playerCollider := GenerateRectCollider(playerPos.X, playerPos.Y, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, 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))))
 		playerColliders[i] = playerCollider
 		space.Add(playerCollider)
 	}
@@ -50,33 +54,35 @@ func NewWorldColliderDisplay(game *Game, stageDiscreteW, stageDiscreteH, stageTi
 	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))))
+		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
+		//newVx, newVy := int32(27999), int32(-420270)
+		//toTestPlayerCollider.X, toTestPlayerCollider.Y = VirtualGridToPolygonColliderBLPos(newVx, newVy, colliderWidth, colliderHeight, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, virtualGridToWorldRatio)
 
-		Logger.Info(fmt.Sprintf("Checking collision for virtual (%d, %d), now playerShape=%v", newVx, newVy, ConvexPolygonStr(toTestPlayerCollider.Shape.(*resolv.ConvexPolygon))))
+		Logger.Info(fmt.Sprintf("Checking collision for playerShape=%v", ConvexPolygonStr(toTestPlayerCollider.Shape.(*resolv.ConvexPolygon))))
 
 		toTestPlayerCollider.Update()
 		if collision := toTestPlayerCollider.Check(0, 0); collision != nil {
 			playerShape := toTestPlayerCollider.Shape.(*resolv.ConvexPolygon)
 			for _, obj := range collision.Objects {
-				barrierShape := obj.Shape.(*resolv.ConvexPolygon)
+				bShape := obj.Shape.(*resolv.ConvexPolygon)
-				if overlapped, pushbackX, pushbackY, overlapResult := CalcPushbacks(0, 0, playerShape, barrierShape); overlapped {
+				Logger.Warn(fmt.Sprintf("Checking potential: a=%v, b=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(bShape)))
-					Logger.Warn(fmt.Sprintf("Overlapped: a=%v, b=%v, pushbackX=%v, pushbackY=%v", ConvexPolygonStr(playerShape), ConvexPolygonStr(barrierShape), pushbackX, pushbackY))
+				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
@@ -109,13 +115,12 @@ 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
 		bulletWx, bulletWy := offenderWx+xfac*meleeBullet.HitboxOffset, offenderWy
-
+		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, "MeleeBullet")
-		newBulletCollider := GenerateRectCollider(bulletWx, bulletWy, meleeBullet.HitboxSize.X, meleeBullet.HitboxSize.Y, spaceOffsetX, spaceOffsetY, "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 +137,13 @@ 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
 		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.HitboxSize.X, meleeBullet.HitboxSize.Y, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY, "MeleeBullet")
 		space.Add(newBulletCollider)
 		bulletShape := newBulletCollider.Shape.(*resolv.ConvexPolygon)
 		Logger.Warn(fmt.Sprintf("bullet <-: Added bullet collider to space: a=%v", ConvexPolygonStr(bulletShape)))
@@ -177,7 +182,7 @@ func (world *WorldColliderDisplay) Draw(screen *ebiten.Image) {
 		}
 	}
 
-	world.Game.DebugDraw(screen, world.Space)
+	//world.Game.DebugDraw(screen, world.Space)
 
 	if world.Game.ShowHelpText {
 

dnmshared/geometry.go

@@ -10,33 +10,33 @@ func NormVec2D(dx, dy float64) Vec2D {
 }
 
 func AlignPolygon2DToBoundingBox(input *Polygon2D) *Polygon2D {
-	// Transform again to put "anchor" at the top-left point of the bounding box for "resolv"
+	// Transform again to put "anchor" at the "bottom-left point (w.r.t. world space)" of the bounding box for "resolv"
-	boundingBoxTL := &Vec2D{
+	boundingBoxBL := &Vec2D{
 		X: math.MaxFloat64,
 		Y: math.MaxFloat64,
 	}
 	for _, p := range input.Points {
-		if p.X < boundingBoxTL.X {
+		if p.X < boundingBoxBL.X {
-			boundingBoxTL.X = p.X
+			boundingBoxBL.X = p.X
 		}
-		if p.Y < boundingBoxTL.Y {
+		if p.Y < boundingBoxBL.Y {
-			boundingBoxTL.Y = p.Y
+			boundingBoxBL.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"
+	// 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 + boundingBoxTL.X,
+			X: input.Anchor.X + boundingBoxBL.X,
-			Y: input.Anchor.Y + boundingBoxTL.Y,
+			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 - boundingBoxTL.X,
+			X: p.X - boundingBoxBL.X,
-			Y: p.Y - boundingBoxTL.Y,
+			Y: p.Y - boundingBoxBL.Y,
 		}
 	}
 

dnmshared/resolv_helper.go

@@ -18,13 +18,17 @@ 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 {
+func RectCenterStr(body *resolv.Object, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64) string {
-	cx, cy := WorldToPolygonColliderAnchorPos(origX, origY, w*0.5, h*0.5, spaceOffsetX, spaceOffsetY)
+	return fmt.Sprintf("{%.2f, %.2f}", body.X+leftPadding+halfBoundingW-spaceOffsetX, body.Y+bottomPadding+halfBoundingH-spaceOffsetY)
-    return GenerateRectColliderInCollisionSpace(cx, cy, w, h, tag) 
 }
 
-func GenerateRectColliderInCollisionSpace(cx, cy, w, h float64, tag string) *resolv.Object {
+func GenerateRectCollider(wx, wy, w, h, topPadding, bottomPadding, leftPadding, rightPadding, spaceOffsetX, spaceOffsetY float64, tag string) *resolv.Object {
-	collider := resolv.NewObject(cx, cy, w, h, tag)
+	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, tag)
+}
+
+func generateRectColliderInCollisionSpace(blX, blY, w, h float64, 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)
 	return collider
@@ -66,6 +70,7 @@ func CalcPushbacks(oldDx, oldDy float64, playerShape, barrierShape *resolv.Conve
 		playerShape.SetPosition(origX, origY)
 	}()
 	playerShape.SetPosition(origX+oldDx, origY+oldDy)
+
 	overlapResult := &SatResult{
 		Overlap:       0,
 		OverlapX:      0,
@@ -74,7 +79,7 @@ func CalcPushbacks(oldDx, oldDy float64, playerShape, barrierShape *resolv.Conve
 		BContainedInA: true,
 		Axis:          vector.Vector{0, 0},
 	}
-	if overlapped := IsPolygonPairOverlapped(playerShape, barrierShape, overlapResult); overlapped {
+	if overlapped := isPolygonPairOverlapped(playerShape, barrierShape, overlapResult); overlapped {
 		pushbackX, pushbackY := overlapResult.Overlap*overlapResult.OverlapX, overlapResult.Overlap*overlapResult.OverlapY
 		return true, pushbackX, pushbackY, overlapResult
 	} else {
@@ -91,16 +96,17 @@ type SatResult struct {
 	Axis          vector.Vector
 }
 
-func IsPolygonPairOverlapped(a, b *resolv.ConvexPolygon, result *SatResult) bool {
+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()
+		return a.Points[0][0] == b.Points[0][0] && a.Points[0][1] == b.Points[0][1]
 	}
 
+	//Logger.Info(fmt.Sprintf("Checking collision between a=%v, b=%v", ConvexPolygonStr(a), ConvexPolygonStr(b)))
 	if 1 < aCnt {
 		for _, axis := range a.SATAxes() {
 			if isPolygonPairSeparatedByDir(a, b, axis.Unit(), result) {
@@ -116,6 +122,7 @@ func IsPolygonPairOverlapped(a, b *resolv.ConvexPolygon, result *SatResult) bool
 			}
 		}
 	}
+	//Logger.Info(fmt.Sprintf("a=%v and b=%v are overlapped", ConvexPolygonStr(a), ConvexPolygonStr(b)))
 
 	return true
 }
@@ -137,9 +144,10 @@ func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e vector.Vector, re
 		e = (-2.98, 1.49).Unit()
 	*/
 
+	//Logger.Info(fmt.Sprintf("Checking separation between a=%v, b=%v along axis e={%.3f, %.3f}#1", ConvexPolygonStr(a), ConvexPolygonStr(b), e[0], e[1]))
 	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()
+		dot := (p[0]+a.X)*e[0] + (p[1]+a.Y)*e[1]
 
 		if aStart > dot {
 			aStart = dot
@@ -151,7 +159,7 @@ func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e vector.Vector, re
 	}
 
 	for _, p := range b.Points {
-		dot := (p.X()+b.X)*e.X() + (p.Y()+b.Y)*e.Y()
+		dot := (p[0]+b.X)*e[0] + (p[1]+b.Y)*e[1]
 
 		if bStart > dot {
 			bStart = dot
@@ -168,7 +176,6 @@ func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e vector.Vector, re
 	}
 
 	if nil != result {
-		result.Axis = e
 		overlap := float64(0)
 
 		if aStart < bStart {
@@ -209,16 +216,19 @@ func isPolygonPairSeparatedByDir(a, b *resolv.ConvexPolygon, e vector.Vector, re
 			absoluteOverlap = -overlap
 		}
 
-		if 0 == currentOverlap || currentOverlap > absoluteOverlap {
+		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.X() * sign
+			result.OverlapX = e[0] * sign
-			result.OverlapY = e.Y() * sign
+			result.OverlapY = e[1] * sign
 		}
+
+		result.Axis = e
+		//Logger.Info(fmt.Sprintf("Checking separation between a=%v, b=%v along axis e={%.3f, %.3f}#2: aStart=%.3f, aEnd=%.3f, bStart=%.3f, bEnd=%.3f, overlap=%.3f, currentOverlap=%.3f, absoluteOverlap=%.3f, result=%v", ConvexPolygonStr(a), ConvexPolygonStr(b), e[0], e[1], aStart, aEnd, bStart, bEnd, overlap, currentOverlap, absoluteOverlap, result))
 	}
 
 	// the specified unit vector "e" doesn't separate "a" and "b", overlap result is generated
@@ -240,20 +250,20 @@ func VirtualGridToWorldPos(vx, vy int32, virtualGridToWorldRatio float64) (float
 	return wx, wy
 }
 
-func WorldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+func WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return wx - halfBoundingW + collisionSpaceOffsetX, wy - halfBoundingH + collisionSpaceOffsetY
+	return wx - halfBoundingW - leftPadding + collisionSpaceOffsetX, wy - halfBoundingH - bottomPadding + collisionSpaceOffsetY
 }
 
-func PolygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
+func PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64) (float64, float64) {
-	return cx + halfBoundingW - collisionSpaceOffsetX, cy + halfBoundingH - collisionSpaceOffsetY
+	return cx + halfBoundingW + leftPadding - collisionSpaceOffsetX, cy + halfBoundingH + bottomPadding - collisionSpaceOffsetY
 }
 
-func PolygonColliderAnchorToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
+func PolygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY float64, worldToVirtualGridRatio float64) (int32, int32) {
-	wx, wy := PolygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
+	wx, wy := PolygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
 	return WorldToVirtualGridPos(wx, wy, worldToVirtualGridRatio)
 }
 
-func VirtualGridToPolygonColliderAnchorPos(vx, vy int32, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY float64, virtualGridToWorldRatio float64) (float64, float64) {
+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 WorldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH, collisionSpaceOffsetX, collisionSpaceOffsetY)
+	return WorldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding, collisionSpaceOffsetX, collisionSpaceOffsetY)
 }

dnmshared/tmx_parser.go

@@ -7,6 +7,7 @@ import (
 	"encoding/base64"
 	"encoding/xml"
 	"errors"
+	"fmt"
 	"go.uber.org/zap"
 	"io/ioutil"
 	"math"
@@ -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"`
+	Width      float64             `xml:"width,attr"`
-	Height     *float64            `xml:"height,attr"`
+	Height     float64             `xml:"height,attr"`
 }
 
 type TmxOrTsxObjectGroup struct {
@@ -376,13 +377,37 @@ func ParseTmxLayersAndGroups(pTmxMapIns *TmxMap, gidBoundariesMap map[int]StrToP
 			}
 
 			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
 				}
 
+				if nil == singleObjInTmxFile.Polyline {
+					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)

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}]}

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": {}
 }

frontend/assets/resources/animation/SoldierFireGhost/frameAnim/Atk1.anim

@@ -1,229 +0,0 @@
-{
-  "__type__": "cc.AnimationClip",
-  "_name": "Atk1",
-  "_objFlags": 0,
-  "_native": "",
-  "_duration": 0.5833333333333334,
-  "sample": 60,
-  "speed": 1,
-  "wrapMode": 1,
-  "curveData": {
-    "comps": {
-      "cc.Sprite": {
-        "spriteFrame": [
-          {
-            "frame": 0,
-            "value": {
-              "__uuid__": "7fedc57f-6998-45fc-899d-ea5edd41ab13"
-            }
-          },
-          {
-            "frame": 0.016666666666666666,
-            "value": {
-              "__uuid__": "d55c2f3c-9110-4627-b8b2-0f9395f0d145"
-            }
-          },
-          {
-            "frame": 0.03333333333333333,
-            "value": {
-              "__uuid__": "1228879d-d28e-48e4-a3ce-5ceda0d1831f"
-            }
-          },
-          {
-            "frame": 0.05,
-            "value": {
-              "__uuid__": "e88dd5c4-cc5d-46e0-88de-e382e2bcadd7"
-            }
-          },
-          {
-            "frame": 0.06666666666666667,
-            "value": {
-              "__uuid__": "df069f5c-7fc0-4731-bb7f-9d2032498e4c"
-            }
-          },
-          {
-            "frame": 0.08333333333333333,
-            "value": {
-              "__uuid__": "4815763d-64e1-4b15-b795-38900861c651"
-            }
-          },
-          {
-            "frame": 0.1,
-            "value": {
-              "__uuid__": "0dca4f06-bf25-4e7f-ac3a-1687e284f5d6"
-            }
-          },
-          {
-            "frame": 0.11666666666666667,
-            "value": {
-              "__uuid__": "de8db3c9-affd-45ef-a536-e2d28ebc8094"
-            }
-          },
-          {
-            "frame": 0.13333333333333333,
-            "value": {
-              "__uuid__": "baaafb8b-9c1a-45ea-ba80-eb8048b61b57"
-            }
-          },
-          {
-            "frame": 0.15,
-            "value": {
-              "__uuid__": "9ffa7db6-1aec-4a1e-a8a9-118f2a6e50dc"
-            }
-          },
-          {
-            "frame": 0.16666666666666666,
-            "value": {
-              "__uuid__": "f2f296ad-0e19-4b00-b061-8c9edff98d0d"
-            }
-          },
-          {
-            "frame": 0.18333333333333332,
-            "value": {
-              "__uuid__": "3e546607-d27f-40fa-9967-771c55a12590"
-            }
-          },
-          {
-            "frame": 0.2,
-            "value": {
-              "__uuid__": "fece0129-e8ae-45be-b963-e2b821add0d3"
-            }
-          },
-          {
-            "frame": 0.21666666666666667,
-            "value": {
-              "__uuid__": "f5f48bec-3d2a-49de-9416-26cc75d34e32"
-            }
-          },
-          {
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  <tileset firstgid="129" source="tiles2.tsx"/>
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  </layer>
  <objectgroup id="1" name="PlayerStartingPos">
-  <object id="135" x="1090" y="833.667">
+  <object id="135" x="882" y="1437.33">
    <point/>
   </object>
-  <object id="137" x="1215" y="830.5">
+  <object id="137" x="955.333" y="1434.67">
    <point/>
   </object>
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@@ -20,149 +20,112 @@
   <properties>
    <property name="type" value="barrier_and_shelter"/>
   </properties>
-  <object id="8" x="648.242" y="480.606">
+  <object id="54" x="656" y="1504" width="80" height="16">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
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   </object>
-  <object id="9" x="650.667" y="1604.67">
+  <object id="55" x="735" y="1552" width="113.5" height="15.5">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 0,18.6667 1041.33,21.3333 1041.33,-1.33333"/>
   </object>
-  <object id="10" x="634.485" y="505.455">
+  <object id="57" x="768" y="1472" width="32" height="16">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 4,1110 24,1110 24,-8"/>
   </object>
-  <object id="11" x="1677.64" y="501.333">
+  <object id="58" x="1040" y="1536" width="80" height="16">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 4,1110 24,1110 24,-8"/>
   </object>
-  <object id="14" x="688.667" y="464">
+  <object id="59" x="1040" y="1568" width="224" height="48">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 -0.666667,78 33.3333,78 32,-0.666667"/>
   </object>
-  <object id="15" x="833.333" y="495.333">
+  <object id="60" x="1216" y="1344" width="224" height="16">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
-   <polyline points="0,0 -112,1.33333 -111.333,44.6667 -1.33333,44.6667"/>
   </object>
-  <object id="17" x="832" y="574">
+  <object id="62" x="1040" y="1552" width="208" height="16">
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-   <polyline points="0,0 -67.3333,0 -67.3333,-76.6667 0.666667,-76"/>
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-  <object id="18" x="865.333" y="606.667">
+  <object id="63" x="1040" y="1504" width="48" height="16">
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     <property name="boundary_type" value="barrier"/>
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     <property name="boundary_type" value="barrier"/>
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+  <object id="84" x="640" y="480" width="16" height="1152">
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     <property name="boundary_type" value="barrier"/>
    </properties>
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     <property name="boundary_type" value="barrier"/>
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-   <polyline points="0,0 63.3333,0.333333 63,-48.3333 -0.666667,-48.3333"/>
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+  <object id="86" x="1104" y="1408" width="96" height="16">
    <properties>
     <property name="boundary_type" value="barrier"/>
    </properties>
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-    <property name="boundary_type" value="barrier"/>
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   </object>
  </objectgroup>
 </map>

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 dirY = 5; // "dirX" and "dirY" determines character facing  
-  int32 speed = 6; // in terms of virtual grid units
+  int32 velX = 6; 
-  int32 battleState = 7;
+  int32 velY = 7; // "velX" and "velY" is used to record the accumulated effect by accelerations (including gravity)
-  int32 joinIndex = 8;
+  int32 speed = 8; // this is the instantaneous scalar attribute of a character, different from but will be accounted in "velX" and "velY" 
-  double colliderRadius = 9;
+  int32 battleState = 9;
-  bool removed = 10;
+  int32 joinIndex = 10;
-  int32 score = 11;
+  double colliderRadius = 11;
-  int32 lastMoveGmtMillis = 12;
+  bool removed = 12;
-  int32 framesToRecover = 13;
+  int32 score = 13;
-  int32 hp = 14;
+  int32 lastMoveGmtMillis = 14;
-  int32 maxHp = 15;
+  int32 framesToRecover = 15;
-  int32 characterState = 16;
+  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 name = 20;
-  string displayName = 18;
+  string displayName = 21;
-  string avatar = 19;
+  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 { 
@@ -133,6 +138,12 @@ message BattleColliderInfo {
   int32 renderCacheSize = 26;
 
   map<int32, MeleeBullet> meleeSkillConfig = 27; // skillId -> skill
+
+  double snapIntoPlatformOverlap = 28; 
+  double snapIntoPlatformThreshold = 29; 
+  int32 jumpingInitVelY = 30;
+  int32 gravityX = 31;
+  int32 gravityY = 32;
 }
 
 message RoomDownsyncFrame {
@@ -141,4 +152,5 @@ message RoomDownsyncFrame {
   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;
 }

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,
@@ -97,7 +97,7 @@
       "__id__": 1
     },
     "_children": [],
-    "_active": true,
+    "_active": false,
     "_components": [
       {
         "__id__": 3
@@ -116,8 +116,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 46.68,
+      "width": 28.01,
-      "height": 27.72
+      "height": 15.12
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -128,8 +128,8 @@
       "__type__": "TypedArray",
       "ctor": "Float64Array",
       "array": [
-        -5,
+        0,
-        50,
+        0,
         0,
         0,
         0,
@@ -169,8 +169,8 @@
     "_useOriginalSize": false,
     "_string": "(0, 0)",
     "_N$string": "(0, 0)",
-    "_fontSize": 20,
+    "_fontSize": 12,
-    "_lineHeight": 22,
+    "_lineHeight": 12,
     "_enableWrapText": true,
     "_N$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,
+      "width": 24,
-      "height": 84
+      "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,
+        0.7,
-        1,
+        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
   },
   {

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": [
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-        "__id__": 2
-      },
-      {
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-    ],
-    "_prefab": {
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-    },
-    "_opacity": 255,
-    "_color": {
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-      "r": 255,
-      "g": 255,
-      "b": 255,
-      "a": 255
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-    "_contentSize": {
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-      "width": 1425,
-      "height": 1024
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-    "_anchorPoint": {
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-      "y": 0.5
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-    "_trs": {
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-      "ctor": "Float64Array",
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-      "y": 0,
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-    "_skewY": 0,
-    "_is3DNode": false,
-    "_groupIndex": 0,
-    "groupIndex": 0,
-    "_id": ""
-  },
-  {
-    "__type__": "cc.Animation",
-    "_name": "",
-    "_objFlags": 0,
-    "node": {
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-    "_enabled": true,
-    "_defaultClip": null,
-    "_clips": [
-      {
-        "__uuid__": "252b321f-81f4-485c-85bd-ea44d298cb76"
-      },
-      null,
-      null,
-      null,
-      {
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-        "__uuid__": "c69bcceb-d7d1-4e33-9623-e2a374a0a6b6"
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-    ],
-    "playOnLoad": false,
-    "_id": ""
-  },
-  {
-    "__type__": "cc.Sprite",
-    "_name": "",
-    "_objFlags": 0,
-    "node": {
-      "__id__": 1
-    },
-    "_enabled": true,
-    "_materials": [
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-        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
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-    ],
-    "_srcBlendFactor": 770,
-    "_dstBlendFactor": 771,
-    "_spriteFrame": null,
-    "_type": 0,
-    "_sizeMode": 1,
-    "_fillType": 0,
-    "_fillCenter": {
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-      "x": 0,
-      "y": 0
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-    "_fillStart": 0,
-    "_fillRange": 0,
-    "_isTrimmedMode": true,
-    "_atlas": {
-      "__uuid__": "145769c8-a259-42bc-8cce-6e035f493c70"
-    },
-    "_id": ""
-  },
-  {
-    "__type__": "cc.PrefabInfo",
-    "root": {
-      "__id__": 1
-    },
-    "asset": {
-      "__id__": 0
-    },
-    "fileId": "44k8wsxglPsJSrMCX58Yve",
-    "sync": false
-  }
-]

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": {}
-}

frontend/assets/scenes/default_map.fire

@@ -78,19 +78,19 @@
     "_active": true,
     "_components": [
       {
-        "__id__": 29
+        "__id__": 37
       },
       {
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+        "__id__": 38
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+        "__id__": 39
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+        "__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": [
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+        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,
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+        0,
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+        0,
+        1,
+        0.66667,
+        0.66667,
+        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": "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,
+      "width": 200,
-      "height": 400
+      "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
+    },
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+      "ctor": "Float64Array",
+      "array": [
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+        0.66667,
+        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": [
+      {
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+      },
+      {
+        "__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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+      "y": 0,
+      "z": 0
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+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": "96xSPG8lxPZIsW+n65WcbU"
+  },
+  {
+    "__type__": "cc.Sprite",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 27
+    },
+    "_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"
   }
 ]

frontend/assets/scenes/login.fire

@@ -440,7 +440,7 @@
       "array": [
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-        210.14647688706773,
+        216.19964242526865,
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frontend/assets/scenes/offline_map_1.fire

@@ -78,19 +78,19 @@
     "_active": true,
     "_components": [
       {
-        "__id__": 19
+        "__id__": 27
       },
       {
-        "__id__": 20
+        "__id__": 28
       },
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-        "__id__": 21
+        "__id__": 29
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+        "__id__": 30
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-        "__id__": 23
+        "__id__": 31
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     ],
     "_prefab": null,
@@ -172,8 +172,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 3200,
+      "width": 2048,
-      "height": 3200
+      "height": 2048
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -191,8 +191,8 @@
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+        1.5,
-        2,
+        1.5,
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       ]
     },
@@ -289,13 +289,13 @@
     },
     "_children": [
       {
-        "__id__": 13
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       }
     ],
     "_active": true,
     "_components": [
       {
-        "__id__": 18
+        "__id__": 26
       }
     ],
     "_prefab": null,
@@ -359,6 +359,12 @@
       },
       {
         "__id__": 11
+      },
+      {
+        "__id__": 13
+      },
+      {
+        "__id__": 17
       }
     ],
     "_active": true,
@@ -454,7 +460,7 @@
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+        215.81269742929726,
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@@ -607,10 +613,10 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "JoystickBG",
+    "_name": "BtnA",
     "_objFlags": 0,
     "_parent": {
-      "__id__": 7
+      "__id__": 8
     },
     "_children": [
       {
@@ -618,12 +624,70 @@
       }
     ],
     "_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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+        -584.849,
+        0,
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+        1,
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+        0.66667,
+        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 +701,8 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 400,
+      "width": 200,
-      "height": 400
+      "height": 200
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -672,6 +736,324 @@
     "_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 +1061,13 @@
     "_name": "Joystick",
     "_objFlags": 0,
     "_parent": {
-      "__id__": 13
+      "__id__": 21
     },
     "_children": [],
     "_active": true,
     "_components": [
       {
-        "__id__": 15
+        "__id__": 23
       }
     ],
     "_prefab": null,
@@ -741,7 +1123,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 14
+      "__id__": 22
     },
     "_enabled": true,
     "_materials": [
@@ -775,7 +1157,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 13
+      "__id__": 21
     },
     "_enabled": true,
     "_materials": [
@@ -809,7 +1191,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 13
+      "__id__": 21
     },
     "_enabled": true,
     "alignMode": 0,
@@ -944,10 +1326,10 @@
       "__id__": 3
     },
     "stickhead": {
-      "__id__": 14
+      "__id__": 22
     },
     "base": {
-      "__id__": 13
+      "__id__": 21
     },
     "joyStickEps": 0.1,
     "magicLeanLowerBound": 0.414,
@@ -967,6 +1349,12 @@
     },
     "linearMovingEps": 0.1,
     "scaleByEps": 0.0375,
+    "btnA": {
+      "__id__": 13
+    },
+    "btnB": {
+      "__id__": 17
+    },
     "_id": "e9oVYTr7ROlpp/IrNjBUmR"
   }
 ]

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.
@@ -37,6 +68,7 @@ cc.Class({
     this.hp = 100;
     this.maxHp = 100;
     this.framesToRecover = 0;
+    this.inAir = true;
   },
 
   setSpecies(speciesName) {
@@ -49,8 +81,7 @@ 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;
   },
 
@@ -67,7 +98,7 @@ cc.Class({
     }
 
     let newCharacterState = rdfPlayer.characterState;
-    const newAnimName = window.ATK_CHARACTER_STATE_ARR[newCharacterState][1];
+    let newAnimName = window.ATK_CHARACTER_STATE_ARR[newCharacterState][1];
     let playingAnimName = null;
     let underlyingAnimationCtrl = null;
 
@@ -96,7 +127,7 @@ 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} -> ${newAnimName}`);
       underlyingAnimationCtrl.gotoAndPlayByFrame(newAnimName, 0, -1);
     } else {
       const animationData = underlyingAnimationCtrl._animations[newAnimName];
@@ -112,7 +143,7 @@ cc.Class({
   _interruptPlayingAnimAndPlayNewAnimFrameAnim(rdfPlayer, prevRdfPlayer, newCharacterState, newAnimName, playingAnimName) {
     if (window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(newCharacterState)) {
       // No "framesToRecover"
-      //console.warn(`#DragonBones JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
+      //console.warn(`#FrameAnim JoinIndex=${rdfPlayer.joinIndex}, ${playingAnimName} -> ${newAnimName}`);
       this.animComp.play(newAnimName, 0);
       return;
     }

frontend/assets/scripts/Map.js

@@ -402,6 +402,7 @@ cc.Class({
       console.log(`Received parsedBattleColliderInfo via ws`);
       // TODO: Upon reconnection, the backend might have already been sending down data that'd trigger "onRoomDownsyncFrame & onInputFrameDownsyncBatch", but frontend could reject those data due to "battleState != PlayerBattleState.ACTIVE".
       Object.assign(self, parsedBattleColliderInfo);
+      self.gravityX = parsedBattleColliderInfo.gravityX; // to avoid integer default value 0 accidentally becoming null in "Object.assign(...)"
       self.tooFastDtIntervalMillis = 0.5 * self.rollbackEstimatedDtMillis;
 
       const tiledMapIns = self.node.getComponent(cc.TiledMap);
@@ -426,6 +427,16 @@ cc.Class({
         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();
         const newTileSize = tiledMapIns.getTileSize();
@@ -442,14 +453,19 @@ cc.Class({
         }
 
         let barrierIdCounter = 0;
-        const boundaryObjs = tileCollisionManager.extractBoundaryObjects(self.node);
+        const refBoundaryObjs = tileCollisionManager.extractBoundaryObjects(self.node).barriers;
-        for (let boundaryObj of boundaryObjs.barriers) {
+        const boundaryObjs = parsedBattleColliderInfo.strToPolygon2DListMap;
-          const x0 = boundaryObj.anchor.x,
+        for (let k = 0; k < boundaryObjs["Barrier"].eles.length; k++) {
-            y0 = boundaryObj.anchor.y;
+          let boundaryObj = boundaryObjs["Barrier"].eles[k];
-
+          const refBoundaryObj = refBoundaryObjs[k];
-          const newBarrierCollider = self.collisionSys.createPolygon(x0, y0, Array.from(boundaryObj, p => {
+          // boundaryObj = refBoundaryObj; 
+          const [x0, y0] = [boundaryObj.anchor.x, boundaryObj.anchor.y];
+          const newBarrierCollider = self.collisionSys.createPolygon(x0, y0, Array.from(boundaryObj.points, p => {
             return [p.x, p.y];
           }));
+          newBarrierCollider.data = {
+            hardPushback: true
+          };
 
           if (self.showCriticalCoordinateLabels) {
             for (let i = 0; i < boundaryObj.length; ++i) {
@@ -572,12 +588,13 @@ cc.Class({
     }
     const shouldForceDumping1 = (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START == rdf.id);
     const shouldForceDumping2 = (rdf.id > self.renderFrameId + self.renderFrameIdLagTolerance);
+    const shouldForceResync = rdf.shouldForceResync;
 
-    const [dumpRenderCacheRet, oldStRenderFrameId, oldEdRenderFrameId] = (shouldForceDumping1 || shouldForceDumping2) ? self.recentRenderCache.setByFrameId(rdf, rdf.id) : [window.RING_BUFF_CONSECUTIVE_SET, null, null];
+    const [dumpRenderCacheRet, oldStRenderFrameId, oldEdRenderFrameId] = (shouldForceDumping1 || shouldForceDumping2 || shouldForceResync) ? self.recentRenderCache.setByFrameId(rdf, rdf.id) : [window.RING_BUFF_CONSECUTIVE_SET, null, null];
     if (window.RING_BUFF_FAILED_TO_SET == dumpRenderCacheRet) {
       throw `Failed to dump render cache#1 (maybe recentRenderCache too small)! rdf.id=${rdf.id}, lastAllConfirmedRenderFrameId=${self.lastAllConfirmedRenderFrameId}, lastAllConfirmedInputFrameId=${self.lastAllConfirmedInputFrameId}; recentRenderCache=${self._stringifyRecentRenderCache(false)}, recentInputCache=${self._stringifyRecentInputCache(false)}`;
     }
-    if (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START < rdf.id && window.RING_BUFF_CONSECUTIVE_SET == dumpRenderCacheRet) {
+    if (!shouldForceResync && (window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START < rdf.id && window.RING_BUFF_CONSECUTIVE_SET == dumpRenderCacheRet)) {
       /*
       Don't change 
       - lastAllConfirmedRenderFrameId, it's updated only in "rollbackAndChase" (except for when RING_BUFF_NON_CONSECUTIVE_SET) 
@@ -762,18 +779,25 @@ cc.Class({
     if (1 == joinIndex) {
       playerScriptIns.setSpecies("SoldierWaterGhost");
     } else if (2 == joinIndex) {
-      playerScriptIns.setSpecies("SoldierFireGhost");
+      playerScriptIns.setSpecies("UltramanTiga");
     }
 
     const [wx, wy] = self.virtualGridToWorldPos(vx, vy);
     newPlayerNode.setPosition(wx, wy);
     playerScriptIns.mapNode = self.node;
-    const colliderWidth = playerDownsyncInfo.colliderRadius * 2,
+    const halfColliderWidth = playerDownsyncInfo.colliderRadius,
-      colliderHeight = playerDownsyncInfo.colliderRadius * 3;
+      halfColliderHeight = playerDownsyncInfo.colliderRadius + playerDownsyncInfo.colliderRadius; // avoid multiplying
-    const [x0, y0] = self.virtualGridToPolygonColliderAnchorPos(vx, vy, colliderWidth, colliderHeight),
+    const colliderWidth = halfColliderWidth + halfColliderWidth,
-      pts = [[0, 0], [colliderWidth, 0], [colliderWidth, colliderHeight], [0, colliderHeight]];
+      colliderHeight = halfColliderHeight + halfColliderHeight; // avoid multiplying
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
+    const cpos = self.virtualGridToPolygonColliderBLPos(vx, vy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding); // the collider center is kept having integer coords
+    const pts = [[0, 0], [leftPadding + colliderWidth + rightPadding, 0], [leftPadding + colliderWidth + rightPadding, bottomPadding + colliderHeight + topPadding], [0, bottomPadding + colliderHeight + topPadding]];
 
-    const newPlayerCollider = self.collisionSys.createPolygon(x0, y0, pts);
+    // [WARNING] The animNode "anchor & offset" are tuned to fit in this collider by "ControlledCharacter prefab & AttackingCharacter.js"! 
+    const newPlayerCollider = self.collisionSys.createPolygon(cpos[0], cpos[1], pts);
     const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
     newPlayerCollider.data = playerDownsyncInfo;
     self.collisionSysMap.set(collisionPlayerIndex, newPlayerCollider);
@@ -833,6 +857,7 @@ cc.Class({
         */
         // [WARNING] Don't try to get "prevRdf(i.e. renderFrameId == latest-1)" by "self.recentRenderCache.getByFrameId(...)" here, as the cache might have been updated by asynchronous "onRoomDownsyncFrame(...)" calls!
         self.applyRoomDownsyncFrameDynamics(rdf, prevRdf);
+        self.showDebugBoundaries(rdf);
         ++self.renderFrameId; // [WARNING] It's important to increment the renderFrameId AFTER all the operations above!!!
         self.lastRenderFrameIdTriggeredAt = performance.now();
         let t3 = performance.now();
@@ -961,13 +986,13 @@ cc.Class({
   applyRoomDownsyncFrameDynamics(rdf, prevRdf) {
     const self = this;
     for (let [playerId, playerRichInfo] of self.playerRichInfoDict.entries()) {
-      const immediatePlayerInfo = rdf.players[playerId];
+      const currPlayerDownsync = rdf.players[playerId];
       const prevRdfPlayer = (null == prevRdf ? null : prevRdf.players[playerId]);
-      const [wx, wy] = self.virtualGridToWorldPos(immediatePlayerInfo.virtualGridX, immediatePlayerInfo.virtualGridY);
+      const [wx, wy] = self.virtualGridToWorldPos(currPlayerDownsync.virtualGridX, currPlayerDownsync.virtualGridY);
       //const justJiggling = (self.jigglingEps1D >= Math.abs(wx - playerRichInfo.node.x) && self.jigglingEps1D >= Math.abs(wy - playerRichInfo.node.y));
       playerRichInfo.node.setPosition(wx, wy);
-      playerRichInfo.scriptIns.updateSpeed(immediatePlayerInfo.speed);
+      playerRichInfo.scriptIns.updateSpeed(currPlayerDownsync.speed);
-      playerRichInfo.scriptIns.updateCharacterAnim(immediatePlayerInfo, prevRdfPlayer, false);
+      playerRichInfo.scriptIns.updateCharacterAnim(currPlayerDownsync, prevRdfPlayer, false);
     }
 
     // Update countdown
@@ -977,6 +1002,79 @@ cc.Class({
     }
   },
 
+  showDebugBoundaries(rdf) {
+    const self = this;
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
+    if (self.showCriticalCoordinateLabels) {
+      let g = self.g;
+      g.clear();
+
+      for (let k in self.collisionSys._bvh._bodies) {
+        const body = self.collisionSys._bvh._bodies[k];
+        if (!body._polygon) continue;
+        if (null != body.data && null != body.data.joinIndex) {
+          // character
+          if (1 == body.data.joinIndex) {
+            g.strokeColor = cc.Color.BLUE;
+          } else {
+            g.strokeColor = cc.Color.RED;
+          }
+        } else {
+          // barrier
+          g.strokeColor = cc.Color.WHITE;
+        }
+        g.moveTo(body.x, body.y);
+        const cnt = body._coords.length;
+        for (let j = 0; j < cnt; j += 2) {
+          const x = body._coords[j],
+            y = body._coords[j + 1];
+          g.lineTo(x, y);
+        }
+        g.lineTo(body.x, body.y);
+        g.stroke();
+      }
+      // For convenience of recovery upon reconnection, active bullets are always created & immediately removed from "collisionSys" within "applyInputFrameDownsyncDynamicsOnSingleRenderFrame"
+
+      for (let k in rdf.meleeBullets) {
+        const meleeBullet = rdf.meleeBullets[k];
+        if (
+          meleeBullet.originatedRenderFrameId + meleeBullet.startupFrames <= rdf.id
+          &&
+          meleeBullet.originatedRenderFrameId + meleeBullet.startupFrames + meleeBullet.activeFrames > rdf.id
+        ) {
+          const offender = rdf.players[meleeBullet.offenderPlayerId];
+          if (1 == offender.joinIndex) {
+            g.strokeColor = cc.Color.BLUE;
+          } else {
+            g.strokeColor = cc.Color.RED;
+          }
+
+          let xfac = 1; // By now, straight Punch offset doesn't respect "y-axis"
+          if (0 > offender.dirX) {
+            xfac = -1;
+          }
+          const [offenderWx, offenderWy] = self.virtualGridToWorldPos(offender.virtualGridX, offender.virtualGridY);
+          const bulletWx = offenderWx + xfac * meleeBullet.hitboxOffset;
+          const bulletWy = offenderWy;
+          const halfColliderWidth = meleeBullet.hitboxSize.x * 0.5,
+            halfColliderHeight = meleeBullet.hitboxSize.y * 0.5; // avoid multiplying
+          const bulletCpos = self.worldToPolygonColliderBLPos(bulletWx, bulletWy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
+          const pts = [[0, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, bottomPadding + meleeBullet.hitboxSize.y + topPadding], [0, bottomPadding + meleeBullet.hitboxSize.y + topPadding]];
+
+          g.moveTo(bulletCpos[0], bulletCpos[1]);
+          for (let j = 0; j < pts.length; j += 1) {
+            g.lineTo(pts[j][0] + bulletCpos[0], pts[j][1] + bulletCpos[1]);
+          }
+          g.lineTo(bulletCpos[0], bulletCpos[1]);
+          g.stroke();
+        }
+      }
+    }
+  },
+
   getCachedInputFrameDownsyncWithPrediction(inputFrameId) {
     const self = this;
     const inputFrameDownsync = self.recentInputCache.getByFrameId(inputFrameId);
@@ -994,6 +1092,10 @@ cc.Class({
   // TODO: Write unit-test for this function to compare with its backend counter part
   applyInputFrameDownsyncDynamicsOnSingleRenderFrame(delayedInputFrame, currRenderFrame, collisionSys, collisionSysMap) {
     const self = this;
+    const leftPadding = self.snapIntoPlatformOverlap,
+      rightPadding = self.snapIntoPlatformOverlap,
+      topPadding = self.snapIntoPlatformOverlap,
+      bottomPadding = self.snapIntoPlatformOverlap;
     const nextRenderFramePlayers = {};
     for (let playerId in currRenderFrame.players) {
       const currPlayerDownsync = currRenderFrame.players[playerId];
@@ -1003,7 +1105,10 @@ cc.Class({
         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,
@@ -1016,27 +1121,108 @@ cc.Class({
     }
 
     const nextRenderFrameMeleeBullets = [];
+    const effPushbacks = new Array(self.playerRichInfoArr.length);
+    const hardPushbackNorms = new Array(self.playerRichInfoArr.length);
 
-    const bulletPushbacks = new Array(self.playerRichInfoArr.length); // Guaranteed determinism regardless of traversal order
+    // 1. Process player inputs
-    const effPushbacks = new Array(self.playerRichInfoArr.length); // Guaranteed determinism regardless of traversal order
+    /*
+    [WARNING] Player input alone WOULD NOT take "characterState" into any "ATK_CHARACTER_STATE_IN_AIR_SET", only after the calculation of "effPushbacks" do we know exactly whether or not a player is "inAir", the finalize the transition of "thatPlayerInNextFrame.characterState". 
+    */
+    if (null != delayedInputFrame) {
+      const delayedInputFrameForPrevRenderFrame = self.getCachedInputFrameDownsyncWithPrediction(self._convertToInputFrameId(currRenderFrame.id - 1, self.inputDelayFrames));
+      const inputList = delayedInputFrame.inputList;
+      for (let j in self.playerRichInfoArr) {
+        const joinIndex = parseInt(j) + 1;
+        const playerRichInfo = self.playerRichInfoArr[j];
+        const playerId = playerRichInfo.id;
+        const currPlayerDownsync = currRenderFrame.players[playerId];
+        const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
+        if (0 < thatPlayerInNextFrame.framesToRecover) {
+          // No need to process inputs for this player, but there might be bullet pushbacks on this player  
+          continue;
+        }
 
-    // Reset playerCollider position from the "virtual grid position"
+        const decodedInput = self.ctrl.decodeInput(inputList[joinIndex - 1]);
+        const prevDecodedInput = (null == delayedInputFrameForPrevRenderFrame ? null : self.ctrl.decodeInput(delayedInputFrameForPrevRenderFrame.inputList[joinIndex - 1]));
+        const prevBtnALevel = (null == prevDecodedInput ? 0 : prevDecodedInput.btnALevel);
+        const prevBtnBLevel = (null == prevDecodedInput ? 0 : prevDecodedInput.btnBLevel);
+        if (1 == decodedInput.btnBLevel && 0 == prevBtnBLevel) {
+          const characStateAlreadyInAir = window.ATK_CHARACTER_STATE_IN_AIR_SET.has(thatPlayerInNextFrame.characterState);
+          const characStateIsInterruptWaivable = window.ATK_CHARACTER_STATE_INTERRUPT_WAIVE_SET.has(thatPlayerInNextFrame.characterState);
+          if (
+            !characStateAlreadyInAir
+            &&
+            characStateIsInterruptWaivable
+          ) {
+            thatPlayerInNextFrame.velY = self.jumpingInitVelY;
+            if (1 == joinIndex) {
+              console.log(`playerId=${playerId}, joinIndex=${joinIndex} jumped at {renderFrame.id: ${currRenderFrame.id}, virtualX: ${currPlayerDownsync.virtualGridX}, virtualY: ${currPlayerDownsync.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
+            }
+          }
+        }
+
+        if (1 == decodedInput.btnALevel && 0 == prevBtnALevel) {
+          const punchSkillId = 1;
+          const punch = window.pb.protos.MeleeBullet.create(self.meleeSkillConfig[punchSkillId]);
+          thatPlayerInNextFrame.framesToRecover = punch.recoveryFrames;
+          punch.battleLocalId = self.bulletBattleLocalIdCounter++;
+          punch.offenderJoinIndex = joinIndex;
+          punch.offenderPlayerId = playerId;
+          punch.originatedRenderFrameId = currRenderFrame.id;
+          nextRenderFrameMeleeBullets.push(punch);
+          // console.log(`playerId=${playerId}, joinIndex=${joinIndex} triggered a rising-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
+
+          thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atk1[0];
+          if (false == currPlayerDownsync.inAir) {
+            thatPlayerInNextFrame.velX = 0; // prohibits simultaneous movement with Atk1 on the ground
+          }
+        } else if (0 == decodedInput.btnALevel && 1 == prevBtnALevel) {
+          // console.log(`playerId=${playerId} triggered a falling-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
+        } else {
+          // No bullet trigger, process joystick movement inputs.
+          if (0 != decodedInput.dx || 0 != decodedInput.dy) {
+            // Update directions and thus would eventually update moving animation accordingly
+            thatPlayerInNextFrame.dirX = decodedInput.dx;
+            thatPlayerInNextFrame.dirY = decodedInput.dy;
+            thatPlayerInNextFrame.velX = decodedInput.dx * currPlayerDownsync.speed;
+            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Walking[0];
+          } else {
+            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
+            thatPlayerInNextFrame.velX = 0;
+          }
+        }
+      }
+    }
+
+    // 2. Process player movement
     for (let j in self.playerRichInfoArr) {
       const joinIndex = parseInt(j) + 1;
-      bulletPushbacks[joinIndex - 1] = [0.0, 0.0];
       effPushbacks[joinIndex - 1] = [0.0, 0.0];
       const playerRichInfo = self.playerRichInfoArr[j];
       const playerId = playerRichInfo.id;
       const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
       const playerCollider = collisionSysMap.get(collisionPlayerIndex);
       const currPlayerDownsync = currRenderFrame.players[playerId];
+      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
+      // Reset playerCollider position from the "virtual grid position"
+      const newVpos = [currPlayerDownsync.virtualGridX + currPlayerDownsync.velX, currPlayerDownsync.virtualGridY + currPlayerDownsync.velY];
+      if (thatPlayerInNextFrame.velY == self.jumpingInitVelY) {
+        // This step can be waived, but putting the jumping inclination here makes it easier to read logs. 
+        newVpos[1] += self.jumpingInitVelY;
+      }
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
+      const newCpos = self.virtualGridToPolygonColliderBLPos(newVpos[0], newVpos[1], halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
+      playerCollider.x = newCpos[0];
+      playerCollider.y = newCpos[1];
 
-      const newVx = currPlayerDownsync.virtualGridX;
+      if (currPlayerDownsync.inAir) {
-      const newVy = currPlayerDownsync.virtualGridY;
+        thatPlayerInNextFrame.velX += self.gravityX;
-      [playerCollider.x, playerCollider.y] = self.virtualGridToPolygonColliderAnchorPos(newVx, newVy, self.playerRichInfoArr[joinIndex - 1].colliderRadius, self.playerRichInfoArr[joinIndex - 1].colliderRadius);
+        thatPlayerInNextFrame.velY += self.gravityY;
+      }
     }
 
-    // Check bullet-anything collisions first, because the pushbacks caused by bullets might later be reverted by player-barrier collision 
+    // 3. Add bullet colliders into collision system
     const bulletColliders = new Map(); // Will all be removed at the end of `applyInputFrameDownsyncDynamicsOnSingleRenderFrame` due to the need for being rollback-compatible
     const removedBulletsAtCurrFrame = new Set();
     for (let k in currRenderFrame.meleeBullets) {
@@ -1058,38 +1244,148 @@ cc.Class({
         const [offenderWx, offenderWy] = self.virtualGridToWorldPos(offender.virtualGridX, offender.virtualGridY);
         const bulletWx = offenderWx + xfac * meleeBullet.hitboxOffset;
         const bulletWy = offenderWy;
-        const [bulletCx, bulletCy] = self.worldToPolygonColliderAnchorPos(bulletWx, bulletWy, meleeBullet.hitboxSize.x * 0.5, meleeBullet.hitboxSize.y * 0.5),
+        const halfColliderWidth = meleeBullet.hitboxSize.x * 0.5,
-          pts = [[0, 0], [meleeBullet.hitboxSize.x, 0], [meleeBullet.hitboxSize.x, meleeBullet.hitboxSize.y], [0, meleeBullet.hitboxSize.y]];
+          halfColliderHeight = meleeBullet.hitboxSize.y * 0.5;
-        const newBulletCollider = collisionSys.createPolygon(bulletCx, bulletCy, pts);
+        const bulletCpos = self.worldToPolygonColliderBLPos(bulletWx, bulletWy, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
+        const pts = [[0, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, 0], [leftPadding + meleeBullet.hitboxSize.x + rightPadding, bottomPadding + meleeBullet.hitboxSize.y + topPadding], [0, bottomPadding + meleeBullet.hitboxSize.y + topPadding]];
+        const newBulletCollider = collisionSys.createPolygon(bulletCpos[0], bulletCpos[1], pts);
         newBulletCollider.data = meleeBullet;
         collisionSysMap.set(collisionBulletIndex, newBulletCollider);
         bulletColliders.set(collisionBulletIndex, newBulletCollider);
-      // console.log(`A meleeBullet is added to collisionSys at currRenderFrame.id=${currRenderFrame.id} as start-up frames ended and active frame is not yet ended: ${JSON.stringify(meleeBullet)}`);
       }
     }
 
+    // 4. Invoke collision system stepping
     collisionSys.update();
-    const result1 = collisionSys.createResult(); // Can I reuse a "self.collisionSysResult" object throughout the whole battle?
+    const result = collisionSys.createResult(); // Can I reuse a "self.collisionSysResult" object throughout the whole battle?
 
+    // 5. Calc pushbacks for each player (after its movement) w/o bullets
+    for (let j in self.playerRichInfoArr) {
+      const joinIndex = parseInt(j) + 1;
+      const playerRichInfo = self.playerRichInfoArr[j];
+      const playerId = playerRichInfo.id;
+      const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
+      const playerCollider = collisionSysMap.get(collisionPlayerIndex);
+      const potentials = playerCollider.potentials();
+      hardPushbackNorms[joinIndex - 1] = self.calcHardPushbacksNorms(playerCollider, potentials, result, self.snapIntoPlatformOverlap, effPushbacks[joinIndex - 1]);
+
+      const currPlayerDownsync = currRenderFrame.players[playerId];
+      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
+
+      let fallStopping = false;
+      let possiblyFallStoppedOnAnotherPlayer = false;
+      for (const potential of potentials) {
+        let [isBarrier, isAnotherPlayer, isBullet] = [true == potential.data.hardPushback, null != potential.data.joinIndex, null != potential.data.offenderJoinIndex];
+        // ignore bullets for this step
+        if (isBullet) continue;
+        // Test if the player collides with the wall/another player
+        if (!playerCollider.collides(potential, result)) continue;
+
+        const normAlignmentWithGravity = (result.overlap_x * 0 + result.overlap_y * (-1.0));
+        const landedOnGravityPushback = (self.snapIntoPlatformThreshold < normAlignmentWithGravity); // prevents false snapping on the lateral sides
+        let pushback = [result.overlap * result.overlap_x, result.overlap * result.overlap_y];
+        if (landedOnGravityPushback) {
+          // kindly note that one player might land on top of another player
+          pushback = [(result.overlap - self.snapIntoPlatformOverlap) * result.overlap_x, (result.overlap - self.snapIntoPlatformOverlap) * result.overlap_y];
+          thatPlayerInNextFrame.inAir = false;
+        }
+        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.
+          */
+          pushback = [(result.overlap - self.snapIntoPlatformOverlap * 2) * result.overlap_x, (result.overlap - self.snapIntoPlatformOverlap * 2) * result.overlap_y]; // will overwrite the previous pushback value if "landedOnGravityPushback" is also true
+        }
+        for (let hardPushbackNorm of hardPushbackNorms[joinIndex - 1]) {
+          // remove pushback component on the directions of "hardPushbackNorms[joinIndex-1]" (by now those hardPushbacks are already accounted in "effPushbacks[joinIndex-1]")
+          const projectedMagnitude = pushback[0] * hardPushbackNorm[0] + pushback[1] * hardPushbackNorm[1];
+          if (isBarrier
+            ||
+            (isAnotherPlayer && 0 > projectedMagnitude)
+          ) {
+            // [WARNING] Pushing by another player is different from pushing by barrier!
+            // Otherwise the player couldn't be pushed by another player to opposite dir of a side wall 
+            pushback[0] -= projectedMagnitude * hardPushbackNorm[0];
+            pushback[1] -= projectedMagnitude * hardPushbackNorm[1];
+          }
+        }
+
+        effPushbacks[joinIndex - 1][0] += pushback[0];
+        effPushbacks[joinIndex - 1][1] += pushback[1];
+        // It's not meaningful to log the virtual positions and velocities inside this step.
+        if (currPlayerDownsync.inAir && landedOnGravityPushback) {
+          fallStopping = true;
+          if (isAnotherPlayer) {
+            possiblyFallStoppedOnAnotherPlayer = true;
+          }
+        }
+
+        if (1 == joinIndex) {
+          if (fallStopping) {
+            console.info(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} fallStopping#1:
+{renderFrame.id: ${currRenderFrame.id}, possiblyFallStoppedOnAnotherPlayer: ${possiblyFallStoppedOnAnotherPlayer}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}`);
+          } else if (currPlayerDownsync.inAir && isBarrier && !landedOnGravityPushback) {
+            console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir & pushed back by barrier & not landed:
+{renderFrame.id: ${currRenderFrame.id}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
+          } else if (currPlayerDownsync.inAir && isAnotherPlayer) {
+            console.warn(`playerId=${playerId}, joinIndex=${currPlayerDownsync.joinIndex} inAir and pushed back by another player
+{renderFrame.id: ${currRenderFrame.id}}
+playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, anotherPlayerColliderPos=${self.stringifyColliderCenterInWorld(potential, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}, landedOnGravityPushback=${landedOnGravityPushback}, fallStopping=${fallStopping}, overlayMag=${result.overlap.toFixed(4)}, len(hardPushbackNorms)=${hardPushbackNorms.length}`);
+          }
+        }
+      }
+
+      if (fallStopping) {
+        thatPlayerInNextFrame.velX = 0;
+        thatPlayerInNextFrame.velY = 0;
+        thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
+        thatPlayerInNextFrame.framesToRecover = 0;
+      }
+      if (currPlayerDownsync.inAir) {
+        thatPlayerInNextFrame.characterState = window.toInAirConjugate(thatPlayerInNextFrame.characterState);
+      }
+    }
+
+    // 6. Check bullet-anything collisions
     bulletColliders.forEach((bulletCollider, collisionBulletIndex) => {
       const potentials = bulletCollider.potentials();
       const offender = currRenderFrame.players[bulletCollider.data.offenderPlayerId];
       let shouldRemove = false;
       for (const potential of potentials) {
         if (null != potential.data && potential.data.joinIndex == bulletCollider.data.offenderJoinIndex) continue;
-        if (!bulletCollider.collides(potential, result1)) continue;
+        if (!bulletCollider.collides(potential, result)) continue;
-        if (null != potential.data && null !== potential.data.joinIndex) {
+        if (null != potential.data && null != potential.data.joinIndex) {
+          const playerId = potential.data.id;
           const joinIndex = potential.data.joinIndex;
           let xfac = 1;
           if (0 > offender.dirX) {
             xfac = -1;
           }
-          bulletPushbacks[joinIndex - 1][0] += xfac * bulletCollider.data.pushback; // Only for straight punch, there's no y-pushback
+          // Only for straight punch, there's no y-pushback 
-          bulletPushbacks[joinIndex - 1][1] += 0;
+          let bulletPushback = [-xfac * bulletCollider.data.pushback, 0];
-          const thatAckedPlayerInNextFrame = nextRenderFramePlayers[potential.data.id];
+          // console.log(`playerId=${playerId}, joinIndex=${joinIndex} is supposed to be pushed back by meleeBullet for bulletPushback=${JSON.stringify(bulletPushback)} at renderFrame.id=${currRenderFrame.id}`);
-          thatAckedPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atked1[0];
+          for (let hardPushbackNorm of hardPushbackNorms[joinIndex - 1]) {
-          const oldFramesToRecover = thatAckedPlayerInNextFrame.framesToRecover;
+            const projectedMagnitude = bulletPushback[0] * hardPushbackNorm[0] + bulletPushback[1] * hardPushbackNorm[1];
-          thatAckedPlayerInNextFrame.framesToRecover = (oldFramesToRecover > bulletCollider.data.hitStunFrames ? oldFramesToRecover : bulletCollider.data.hitStunFrames); // In case the hit player is already stun, we extend it 
+            if (0 > projectedMagnitude) {
+              // Otherwise when smashing into a wall the atked player would be pushed into the wall first and only got back in the next renderFrame, not what I want here
+              bulletPushback[0] -= (projectedMagnitude * hardPushbackNorm[0]);
+              bulletPushback[1] -= (projectedMagnitude * hardPushbackNorm[1]);
+            //   console.log(`playerId=${playerId}, joinIndex=${joinIndex} reducing bulletPushback=${JSON.stringify(bulletPushback)} by ${JSON.stringify([projectedMagnitude * hardPushbackNorm[0], projectedMagnitude * hardPushbackNorm[1]])} where hardPushbackNorm=${JSON.stringify(hardPushbackNorm)}, projectedMagnitude=${projectedMagnitude} at renderFrame.id=${currRenderFrame.id}`);
+            }
+          }
+          // console.log(`playerId=${playerId}, joinIndex=${joinIndex} is actually pushed back by meleeBullet for bulletPushback=${JSON.stringify(bulletPushback)} at renderFrame.id=${currRenderFrame.id}`);
+          effPushbacks[joinIndex - 1][0] += bulletPushback[0];
+          effPushbacks[joinIndex - 1][1] += bulletPushback[1];
+          const [atkedPlayerInCurFrame, atkedPlayerInNextFrame] = [currRenderFrame.players[potential.data.id], nextRenderFramePlayers[potential.data.id]];
+          atkedPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atked1[0];
+          if (atkedPlayerInCurFrame.inAir) {
+            atkedPlayerInNextFrame.characterState = window.toInAirConjugate(atkedPlayerInNextFrame.characterState);
+          }
+          const oldFramesToRecover = atkedPlayerInNextFrame.framesToRecover;
+          atkedPlayerInNextFrame.framesToRecover = (oldFramesToRecover > bulletCollider.data.hitStunFrames ? oldFramesToRecover : bulletCollider.data.hitStunFrames); // In case the hit player is already stun, we extend it 
         }
         shouldRemove = true;
       }
@@ -1111,95 +1407,38 @@ cc.Class({
       nextRenderFrameMeleeBullets.push(meleeBullet);
     }
 
-    // Process player inputs
+    // 7. Get players out of stuck barriers if there's any
-    if (null != delayedInputFrame) {
+    for (let j in self.playerRichInfoArr) {
-      const delayedInputFrameForPrevRenderFrame = self.getCachedInputFrameDownsyncWithPrediction(self._convertToInputFrameId(currRenderFrame.id - 1, self.inputDelayFrames));
+      const joinIndex = parseInt(j) + 1;
-      const inputList = delayedInputFrame.inputList;
+      const playerId = self.playerRichInfoArr[j].id;
-      for (let j in self.playerRichInfoArr) {
+      const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
-        const joinIndex = parseInt(j) + 1;
+      const playerCollider = collisionSysMap.get(collisionPlayerIndex);
-        effPushbacks[joinIndex - 1] = [0.0, 0.0];
+      // Update "virtual grid position"
-        const playerRichInfo = self.playerRichInfoArr[j];
+      const currPlayerDownsync = currRenderFrame.players[playerId];
-        const playerId = playerRichInfo.id;
+      const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
-        const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
+      const halfColliderWidth = self.playerRichInfoArr[j].colliderRadius,
-        const playerCollider = collisionSysMap.get(collisionPlayerIndex);
+        halfColliderHeight = self.playerRichInfoArr[j].colliderRadius + self.playerRichInfoArr[j].colliderRadius; // avoid multiplying
-        const currPlayerDownsync = currRenderFrame.players[playerId];
+      const newVpos = self.polygonColliderBLToVirtualGridPos(playerCollider.x - effPushbacks[joinIndex - 1][0], playerCollider.y - effPushbacks[joinIndex - 1][1], halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding);
-        const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
+      thatPlayerInNextFrame.virtualGridX = newVpos[0];
-        if (0 < thatPlayerInNextFrame.framesToRecover) {
+      thatPlayerInNextFrame.virtualGridY = newVpos[1];
-          // No need to process inputs for this player, but there might be bullet pushbacks on this player  
-          playerCollider.x += bulletPushbacks[joinIndex - 1][0];
-          playerCollider.y += bulletPushbacks[joinIndex - 1][1];
-          if (0 != bulletPushbacks[joinIndex - 1][0] || 0 != bulletPushbacks[joinIndex - 1][1]) {
-            console.log(`playerId=${playerId}, joinIndex=${joinIndex} is pushbacked back by ${bulletPushbacks[joinIndex - 1]} by bullet impacts, now its framesToRecover is ${thatPlayerInNextFrame.framesToRecover}`);
-          }
-          continue;
-        }
 
-        const decodedInput = self.ctrl.decodeInput(inputList[joinIndex - 1]);
+      if (1 == thatPlayerInNextFrame.joinIndex) {
-
+        if (currPlayerDownsync.inAir && !thatPlayerInNextFrame.inAir) {
-        const prevDecodedInput = (null == delayedInputFrameForPrevRenderFrame ? null : self.ctrl.decodeInput(delayedInputFrameForPrevRenderFrame.inputList[joinIndex - 1]));
+          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} fallStopping#2:
-        const prevBtnALevel = (null == prevDecodedInput ? 0 : prevDecodedInput.btnALevel);
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}
-
+	calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
-        if (1 == decodedInput.btnALevel && 0 == prevBtnALevel) {
+        } else if (!currPlayerDownsync.inAir && thatPlayerInNextFrame.inAir) {
-          // console.log(`playerId=${playerId} triggered a rising-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
+          console.warn(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} took off:
-          if (self.bulletTriggerEnabled) {
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}}
-            const punchSkillId = 1;
+	calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
-            const punch = window.pb.protos.MeleeBullet.create(self.meleeSkillConfig[punchSkillId]);
+        } else if (thatPlayerInNextFrame.inAir && 0 != thatPlayerInNextFrame.velY) {
-            thatPlayerInNextFrame.framesToRecover = punch.recoveryFrames;
+          /*
-            punch.battleLocalId = self.bulletBattleLocalIdCounter++;
+          console.log(`playerId=${playerId}, joinIndex=${thatPlayerInNextFrame.joinIndex} inAir trajectory:
-            punch.offenderJoinIndex = joinIndex;
+{nextRenderFrame.id: ${currRenderFrame.id + 1}, nextVirtualX: ${thatPlayerInNextFrame.virtualGridX}, nextVirtualY: ${thatPlayerInNextFrame.virtualGridY}, nextVelX: ${thatPlayerInNextFrame.velX}, nextVelY: ${thatPlayerInNextFrame.velY}};
-            punch.offenderPlayerId = playerId;
+          calculated from <- playerColliderPos=${self.stringifyColliderCenterInWorld(playerCollider, halfColliderWidth, halfColliderHeight, topPadding, bottomPadding, leftPadding, rightPadding)}, effPushback={${effPushbacks[joinIndex - 1][0].toFixed(3)}, ${effPushbacks[joinIndex - 1][1].toFixed(3)}}`);
-            punch.originatedRenderFrameId = currRenderFrame.id;
+          */
-            nextRenderFrameMeleeBullets.push(punch);
-            // console.log(`A rising-edge of meleeBullet is created at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}: ${self._stringifyRecentInputCache(true)}`);
-            // console.log(`A rising-edge of meleeBullet is created at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
-
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Atk1[0];
-          }
-        } else if (0 == decodedInput.btnALevel && 1 == prevBtnALevel) {
-          // console.log(`playerId=${playerId} triggered a falling-edge of btnA at renderFrame.id=${currRenderFrame.id}, delayedInputFrame.id=${delayedInputFrame.inputFrameId}`);
-        } else {
-          // No bullet trigger, process movement inputs
-          if (0 != decodedInput.dx || 0 != decodedInput.dy) {
-            // Update directions and thus would eventually update moving animation accordingly
-            thatPlayerInNextFrame.dirX = decodedInput.dx;
-            thatPlayerInNextFrame.dirY = decodedInput.dy;
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Walking[0];
-          } else {
-            thatPlayerInNextFrame.characterState = window.ATK_CHARACTER_STATE.Idle1[0];
-          }
-          const [movementX, movementY] = self.virtualGridToWorldPos(decodedInput.dx + currPlayerDownsync.speed * decodedInput.dx, decodedInput.dy + currPlayerDownsync.speed * decodedInput.dy);
-          playerCollider.x += movementX;
-          playerCollider.y += movementY;
         }
       }
-
-      collisionSys.update(); // by now all "bulletCollider"s are removed
-      const result2 = collisionSys.createResult(); // Can I reuse a "self.collisionSysResult" object throughout the whole battle?
-
-      for (let j in self.playerRichInfoArr) {
-        const joinIndex = parseInt(j) + 1;
-        const playerId = self.playerRichInfoArr[j].id;
-        const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
-        const playerCollider = collisionSysMap.get(collisionPlayerIndex);
-        const potentials = playerCollider.potentials();
-        for (const potential of potentials) {
-          // Test if the player collides with the wall
-          if (!playerCollider.collides(potential, result2)) continue;
-          // Push the player out of the wall
-          effPushbacks[joinIndex - 1][0] += result2.overlap * result2.overlap_x;
-          effPushbacks[joinIndex - 1][1] += result2.overlap * result2.overlap_y;
-        }
-      }
-
-      for (let j in self.playerRichInfoArr) {
-        const joinIndex = parseInt(j) + 1;
-        const playerId = self.playerRichInfoArr[j].id;
-        const collisionPlayerIndex = self.collisionPlayerIndexPrefix + joinIndex;
-        const playerCollider = collisionSysMap.get(collisionPlayerIndex);
-        const thatPlayerInNextFrame = nextRenderFramePlayers[playerId];
-        [thatPlayerInNextFrame.virtualGridX, thatPlayerInNextFrame.virtualGridY] = self.polygonColliderAnchorToVirtualGridPos(playerCollider.x - effPushbacks[joinIndex - 1][0], playerCollider.y - effPushbacks[joinIndex - 1][1], self.playerRichInfoArr[j].colliderRadius, self.playerRichInfoArr[j].colliderRadius);
-      }
-
     }
 
     return window.pb.protos.RoomDownsyncFrame.create({
@@ -1214,11 +1453,10 @@ cc.Class({
     This function eventually calculates a "RoomDownsyncFrame" where "RoomDownsyncFrame.id == renderFrameIdEd" if not interruptted.
     */
     const self = this;
-    let i = renderFrameIdSt,
+    let prevLatestRdf = null,
-      prevLatestRdf = null,
       latestRdf = null;
 
-    do {
+    for (let i = renderFrameIdSt; i < renderFrameIdEd; i++) {
       latestRdf = self.recentRenderCache.getByFrameId(i); // typed "RoomDownsyncFrame"; [WARNING] When "true == isChasing", this function can be interruptted by "onRoomDownsyncFrame(rdf)" asynchronously anytime, making this line return "null"!
       if (null == latestRdf) {
         console.warn(`Couldn't find renderFrame for i=${i} to rollback, self.renderFrameId=${self.renderFrameId}, lastAllConfirmedRenderFrameId=${self.lastAllConfirmedRenderFrameId}, lastAllConfirmedInputFrameId=${self.lastAllConfirmedInputFrameId}, might've been interruptted by onRoomDownsyncFrame`);
@@ -1250,8 +1488,7 @@ cc.Class({
         self.chaserRenderFrameId = latestRdf.id;
       }
       self.recentRenderCache.setByFrameId(latestRdf, latestRdf.id);
-      ++i;
+    }
-    } while (i < renderFrameIdEd);
 
     return [prevLatestRdf, latestRdf];
   },
@@ -1264,16 +1501,16 @@ cc.Class({
       const immediatePlayerInfo = players[playerId];
       self.playerRichInfoDict.set(playerId, immediatePlayerInfo);
 
-      const [theNode, theScriptIns] = self.spawnPlayerNode(immediatePlayerInfo.joinIndex, immediatePlayerInfo.virtualGridX, immediatePlayerInfo.virtualGridY, immediatePlayerInfo);
+      const nodeAndScriptIns = self.spawnPlayerNode(immediatePlayerInfo.joinIndex, immediatePlayerInfo.virtualGridX, immediatePlayerInfo.virtualGridY, immediatePlayerInfo);
 
       Object.assign(self.playerRichInfoDict.get(playerId), {
-        node: theNode,
+        node: nodeAndScriptIns[0],
-        scriptIns: theScriptIns,
+        scriptIns: nodeAndScriptIns[1],
       });
 
       if (self.selfPlayerInfo.id == playerId) {
         self.selfPlayerInfo = Object.assign(self.selfPlayerInfo, immediatePlayerInfo);
-        theScriptIns.showArrowTipNode();
+        nodeAndScriptIns[1].showArrowTipNode();
       }
     }
     self.playerRichInfoArr = new Array(self.playerRichInfoDict.size);
@@ -1320,28 +1557,47 @@ cc.Class({
   virtualGridToWorldPos(vx, vy) {
     // No loss of precision
     const self = this;
-    let wx = parseFloat(vx) * self.virtualGridToWorldRatio;
+    return [vx * self.virtualGridToWorldRatio, vy * self.virtualGridToWorldRatio];
-    let wy = parseFloat(vy) * self.virtualGridToWorldRatio;
-    return [wx, wy];
   },
 
-  worldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH) {
+  worldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
-    return [wx - halfBoundingW, wy - halfBoundingH];
+    return [wx - halfBoundingW - leftPadding, wy - halfBoundingH - bottomPadding];
   },
 
-  polygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH) {
+  polygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
-    return [cx + halfBoundingW, cy + halfBoundingH];
+    return [cx + halfBoundingW + leftPadding, cy + halfBoundingH + bottomPadding];
   },
 
-  polygonColliderAnchorToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH) {
+  polygonColliderBLToVirtualGridPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
     const self = this;
-    const [wx, wy] = self.polygonColliderAnchorToWorldPos(cx, cy, halfBoundingW, halfBoundingH);
+    const [wx, wy] = self.polygonColliderBLToWorldPos(cx, cy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding);
     return self.worldToVirtualGridPos(wx, wy)
   },
 
-  virtualGridToPolygonColliderAnchorPos(vx, vy, halfBoundingW, halfBoundingH) {
+  virtualGridToPolygonColliderBLPos(vx, vy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
     const self = this;
     const [wx, wy] = self.virtualGridToWorldPos(vx, vy);
-    return self.worldToPolygonColliderAnchorPos(wx, wy, halfBoundingW, halfBoundingH)
+    return self.worldToPolygonColliderBLPos(wx, wy, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding)
+  },
+
+  stringifyColliderCenterInWorld(playerCollider, halfBoundingW, halfBoundingH, topPadding, bottomPadding, leftPadding, rightPadding) {
+    return `{${(playerCollider.x + leftPadding + halfBoundingW).toFixed(2)}, ${(playerCollider.y + bottomPadding + halfBoundingH).toFixed(2)}}`;
+  },
+
+  calcHardPushbacksNorms(collider, potentials, result, snapIntoPlatformOverlap, effPushback) {
+    const self = this;
+    let ret = [];
+    for (const potential of potentials) {
+      if (null == potential.data || !(true == potential.data.hardPushback)) continue;
+      if (!collider.collides(potential, result)) continue;
+      // ALWAY snap into hardPushbacks!
+      // [overlay_x, overlap_y] is the unit vector that points into the platform
+      const pushback = [(result.overlap - snapIntoPlatformOverlap) * result.overlap_x, (result.overlap - snapIntoPlatformOverlap) * result.overlap_y];
+      ret.push([result.overlap_x, result.overlap_y]);
+      effPushback[0] += pushback[0];
+      effPushback[1] += pushback[1];
+    }
+
+    return ret;
   },
 });

frontend/assets/scripts/OfflineMap.js

@@ -13,6 +13,7 @@ cc.Class({
   onLoad() {
     const self = this;
     window.mapIns = self;
+    self.showCriticalCoordinateLabels = true;
 
     cc.director.getCollisionManager().enabled = false;
 
@@ -34,9 +35,11 @@ cc.Class({
     self.inputFrameUpsyncDelayTolerance = 2;
 
     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;
@@ -44,7 +47,7 @@ cc.Class({
       1: {
         // for offender
         startupFrames: 10,
-        activeFrames: 3,
+        activeFrames: 20,
         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,
@@ -67,6 +70,16 @@ cc.Class({
       }
     };
 
+    /* 
+    [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);
 
     const fullPathOfTmxFile = cc.js.formatStr("map/%s/map", "dungeon");
@@ -80,6 +93,17 @@ cc.Class({
       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();
       const newTileSize = tiledMapIns.getTileSize();
@@ -95,8 +119,11 @@ cc.Class({
         const newBarrier = self.collisionSys.createPolygon(x0, y0, Array.from(boundaryObj, p => {
           return [p.x, p.y];
         }));
+        newBarrier.data = {
+          hardPushback: true
+        };
 
-        if (self.showCriticalCoordinateLabels) {
+        if (false && self.showCriticalCoordinateLabels) {
           for (let i = 0; i < boundaryObj.length; ++i) {
             const barrierVertLabelNode = new cc.Node();
             switch (i % 4) {
@@ -136,30 +163,36 @@ cc.Class({
       const startRdf = window.pb.protos.RoomDownsyncFrame.create({
         id: window.MAGIC_ROOM_DOWNSYNC_FRAME_ID.BATTLE_START,
         players: {
-          10: {
+          10: window.pb.protos.PlayerDownsync.create({
             id: 10,
             joinIndex: 1,
-            virtualGridX: 0,
+            virtualGridX: self.worldToVirtualGridPos(boundaryObjs.playerStartingPositions[0].x, boundaryObjs.playerStartingPositions[0].y)[0],
-            virtualGridY: 0,
+            virtualGridY: self.worldToVirtualGridPos(boundaryObjs.playerStartingPositions[0].x, boundaryObjs.playerStartingPositions[0].y)[1],
             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,
-          11: {
+            velY: 0,
+            inAir: true,
+          }),
+          11: window.pb.protos.PlayerDownsync.create({
             id: 11,
             joinIndex: 2,
-            virtualGridX: 80 * self.worldToVirtualGridRatio,
+            virtualGridX: self.worldToVirtualGridPos(boundaryObjs.playerStartingPositions[1].x, boundaryObjs.playerStartingPositions[1].y)[0],
-            virtualGridY: 0 * self.worldToVirtualGridRatio,
+            virtualGridY: self.worldToVirtualGridPos(boundaryObjs.playerStartingPositions[1].x, boundaryObjs.playerStartingPositions[1].y)[1],
             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 = {
@@ -177,7 +210,8 @@ 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;
       }
@@ -194,11 +228,12 @@ cc.Class({
 
         const [prevRdf, rdf] = self.rollbackAndChase(self.renderFrameId, self.renderFrameId + 1, self.collisionSys, self.collisionSysMap, 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!!!
       }
     }
   },

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.
@@ -115,6 +116,18 @@ TileCollisionManager.prototype.extractBoundaryObjects = function(withTiledMapNod
   const allObjectGroups = tiledMapIns.getObjectGroups();
   for (let i = 0; i < allObjectGroups.length; ++i) {
     var objectGroup = allObjectGroups[i];
+    if ("PlayerStartingPos" == objectGroup.getGroupName()) {
+      var allObjects = objectGroup.getObjects();
+      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);
+      }
+      continue;
+    }
     if ("barrier_and_shelter" != objectGroup.getProperty("type")) continue;
     var allObjects = objectGroup.getObjects();
     for (let j = 0; j < allObjects.length; ++j) {
@@ -123,21 +136,33 @@ TileCollisionManager.prototype.extractBoundaryObjects = function(withTiledMapNod
       if (0 < gid) {
         continue;
       }
-      const polylinePoints = object.polylinePoints;
-      if (null == polylinePoints) {
-        continue
-      }
       const boundaryType = object.boundary_type;
-      let toPushBarriers = [];
+      let toPushBarrier = [];
-      toPushBarriers.boundaryType = boundaryType;
+      toPushBarrier.boundaryType = boundaryType;
       switch (boundaryType) {
         case "barrier":
+          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! 
+          toPushBarrier.anchor = this.continuousObjLayerOffsetToContinuousMapNodePos(withTiledMapNode, object.offset); // DON'T use "(object.x, object.y)" which are wrong/meaningless! 
-          toRet.barriers.push(toPushBarriers);
+          toRet.barriers.push(toPushBarrier);
           break;
         default:
           break;

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,
     });
   },
 });

frontend/assets/scripts/WsSessionMgr.js

@@ -146,7 +146,7 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
     }
     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);

frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js

@@ -1196,6 +1196,8 @@ $root.protos = (function() {
          * @property {number|null} [virtualGridY] PlayerDownsync virtualGridY
          * @property {number|null} [dirX] PlayerDownsync dirX
          * @property {number|null} [dirY] PlayerDownsync dirY
+         * @property {number|null} [velX] PlayerDownsync velX
+         * @property {number|null} [velY] PlayerDownsync velY
          * @property {number|null} [speed] PlayerDownsync speed
          * @property {number|null} [battleState] PlayerDownsync battleState
          * @property {number|null} [joinIndex] PlayerDownsync joinIndex
@@ -1207,6 +1209,7 @@ $root.protos = (function() {
          * @property {number|null} [hp] PlayerDownsync hp
          * @property {number|null} [maxHp] PlayerDownsync maxHp
          * @property {number|null} [characterState] PlayerDownsync characterState
+         * @property {boolean|null} [inAir] PlayerDownsync inAir
          * @property {string|null} [name] PlayerDownsync name
          * @property {string|null} [displayName] PlayerDownsync displayName
          * @property {string|null} [avatar] PlayerDownsync avatar
@@ -1267,6 +1270,22 @@ $root.protos = (function() {
          */
         PlayerDownsync.prototype.dirY = 0;
 
+        /**
+         * PlayerDownsync velX.
+         * @member {number} velX
+         * @memberof protos.PlayerDownsync
+         * @instance
+         */
+        PlayerDownsync.prototype.velX = 0;
+
+        /**
+         * PlayerDownsync velY.
+         * @member {number} velY
+         * @memberof protos.PlayerDownsync
+         * @instance
+         */
+        PlayerDownsync.prototype.velY = 0;
+
         /**
          * PlayerDownsync speed.
          * @member {number} speed
@@ -1355,6 +1374,14 @@ $root.protos = (function() {
          */
         PlayerDownsync.prototype.characterState = 0;
 
+        /**
+         * PlayerDownsync inAir.
+         * @member {boolean} inAir
+         * @memberof protos.PlayerDownsync
+         * @instance
+         */
+        PlayerDownsync.prototype.inAir = false;
+
         /**
          * PlayerDownsync name.
          * @member {string} name
@@ -1413,34 +1440,40 @@ $root.protos = (function() {
                 writer.uint32(/* id 4, wireType 0 =*/32).int32(message.dirX);
             if (message.dirY != null && Object.hasOwnProperty.call(message, "dirY"))
                 writer.uint32(/* id 5, wireType 0 =*/40).int32(message.dirY);
+            if (message.velX != null && Object.hasOwnProperty.call(message, "velX"))
+                writer.uint32(/* id 6, wireType 0 =*/48).int32(message.velX);
+            if (message.velY != null && Object.hasOwnProperty.call(message, "velY"))
+                writer.uint32(/* id 7, wireType 0 =*/56).int32(message.velY);
             if (message.speed != null && Object.hasOwnProperty.call(message, "speed"))
-                writer.uint32(/* id 6, wireType 0 =*/48).int32(message.speed);
+                writer.uint32(/* id 8, wireType 0 =*/64).int32(message.speed);
             if (message.battleState != null && Object.hasOwnProperty.call(message, "battleState"))
-                writer.uint32(/* id 7, wireType 0 =*/56).int32(message.battleState);
+                writer.uint32(/* id 9, wireType 0 =*/72).int32(message.battleState);
             if (message.joinIndex != null && Object.hasOwnProperty.call(message, "joinIndex"))
-                writer.uint32(/* id 8, wireType 0 =*/64).int32(message.joinIndex);
+                writer.uint32(/* id 10, wireType 0 =*/80).int32(message.joinIndex);
             if (message.colliderRadius != null && Object.hasOwnProperty.call(message, "colliderRadius"))
-                writer.uint32(/* id 9, wireType 1 =*/73).double(message.colliderRadius);
+                writer.uint32(/* id 11, wireType 1 =*/89).double(message.colliderRadius);
             if (message.removed != null && Object.hasOwnProperty.call(message, "removed"))
-                writer.uint32(/* id 10, wireType 0 =*/80).bool(message.removed);
+                writer.uint32(/* id 12, wireType 0 =*/96).bool(message.removed);
             if (message.score != null && Object.hasOwnProperty.call(message, "score"))
-                writer.uint32(/* id 11, wireType 0 =*/88).int32(message.score);
+                writer.uint32(/* id 13, wireType 0 =*/104).int32(message.score);
             if (message.lastMoveGmtMillis != null && Object.hasOwnProperty.call(message, "lastMoveGmtMillis"))
-                writer.uint32(/* id 12, wireType 0 =*/96).int32(message.lastMoveGmtMillis);
+                writer.uint32(/* id 14, wireType 0 =*/112).int32(message.lastMoveGmtMillis);
             if (message.framesToRecover != null && Object.hasOwnProperty.call(message, "framesToRecover"))
-                writer.uint32(/* id 13, wireType 0 =*/104).int32(message.framesToRecover);
+                writer.uint32(/* id 15, wireType 0 =*/120).int32(message.framesToRecover);
             if (message.hp != null && Object.hasOwnProperty.call(message, "hp"))
-                writer.uint32(/* id 14, wireType 0 =*/112).int32(message.hp);
+                writer.uint32(/* id 16, wireType 0 =*/128).int32(message.hp);
             if (message.maxHp != null && Object.hasOwnProperty.call(message, "maxHp"))
-                writer.uint32(/* id 15, wireType 0 =*/120).int32(message.maxHp);
+                writer.uint32(/* id 17, wireType 0 =*/136).int32(message.maxHp);
             if (message.characterState != null && Object.hasOwnProperty.call(message, "characterState"))
-                writer.uint32(/* id 16, wireType 0 =*/128).int32(message.characterState);
+                writer.uint32(/* id 18, wireType 0 =*/144).int32(message.characterState);
+            if (message.inAir != null && Object.hasOwnProperty.call(message, "inAir"))
+                writer.uint32(/* id 19, wireType 0 =*/152).bool(message.inAir);
             if (message.name != null && Object.hasOwnProperty.call(message, "name"))
-                writer.uint32(/* id 17, wireType 2 =*/138).string(message.name);
+                writer.uint32(/* id 20, wireType 2 =*/162).string(message.name);
             if (message.displayName != null && Object.hasOwnProperty.call(message, "displayName"))
-                writer.uint32(/* id 18, wireType 2 =*/146).string(message.displayName);
+                writer.uint32(/* id 21, wireType 2 =*/170).string(message.displayName);
             if (message.avatar != null && Object.hasOwnProperty.call(message, "avatar"))
-                writer.uint32(/* id 19, wireType 2 =*/154).string(message.avatar);
+                writer.uint32(/* id 22, wireType 2 =*/178).string(message.avatar);
             return writer;
         };
 
@@ -1496,58 +1529,70 @@ $root.protos = (function() {
                         break;
                     }
                 case 6: {
-                        message.speed = reader.int32();
+                        message.velX = reader.int32();
                         break;
                     }
                 case 7: {
-                        message.battleState = reader.int32();
+                        message.velY = reader.int32();
                         break;
                     }
                 case 8: {
-                        message.joinIndex = reader.int32();
+                        message.speed = reader.int32();
                         break;
                     }
                 case 9: {
-                        message.colliderRadius = reader.double();
+                        message.battleState = reader.int32();
                         break;
                     }
                 case 10: {
-                        message.removed = reader.bool();
+                        message.joinIndex = reader.int32();
                         break;
                     }
                 case 11: {
-                        message.score = reader.int32();
+                        message.colliderRadius = reader.double();
                         break;
                     }
                 case 12: {
-                        message.lastMoveGmtMillis = reader.int32();
+                        message.removed = reader.bool();
                         break;
                     }
                 case 13: {
-                        message.framesToRecover = reader.int32();
+                        message.score = reader.int32();
                         break;
                     }
                 case 14: {
-                        message.hp = reader.int32();
+                        message.lastMoveGmtMillis = reader.int32();
                         break;
                     }
                 case 15: {
-                        message.maxHp = reader.int32();
+                        message.framesToRecover = reader.int32();
                         break;
                     }
                 case 16: {
-                        message.characterState = reader.int32();
+                        message.hp = reader.int32();
                         break;
                     }
                 case 17: {
-                        message.name = reader.string();
+                        message.maxHp = reader.int32();
                         break;
                     }
                 case 18: {
-                        message.displayName = reader.string();
+                        message.characterState = reader.int32();
                         break;
                     }
                 case 19: {
+                        message.inAir = reader.bool();
+                        break;
+                    }
+                case 20: {
+                        message.name = reader.string();
+                        break;
+                    }
+                case 21: {
+                        message.displayName = reader.string();
+                        break;
+                    }
+                case 22: {
                         message.avatar = reader.string();
                         break;
                     }
@@ -1601,6 +1646,12 @@ $root.protos = (function() {
             if (message.dirY != null && message.hasOwnProperty("dirY"))
                 if (!$util.isInteger(message.dirY))
                     return "dirY: integer expected";
+            if (message.velX != null && message.hasOwnProperty("velX"))
+                if (!$util.isInteger(message.velX))
+                    return "velX: integer expected";
+            if (message.velY != null && message.hasOwnProperty("velY"))
+                if (!$util.isInteger(message.velY))
+                    return "velY: integer expected";
             if (message.speed != null && message.hasOwnProperty("speed"))
                 if (!$util.isInteger(message.speed))
                     return "speed: integer expected";
@@ -1634,6 +1685,9 @@ $root.protos = (function() {
             if (message.characterState != null && message.hasOwnProperty("characterState"))
                 if (!$util.isInteger(message.characterState))
                     return "characterState: integer expected";
+            if (message.inAir != null && message.hasOwnProperty("inAir"))
+                if (typeof message.inAir !== "boolean")
+                    return "inAir: boolean expected";
             if (message.name != null && message.hasOwnProperty("name"))
                 if (!$util.isString(message.name))
                     return "name: string expected";
@@ -1668,6 +1722,10 @@ $root.protos = (function() {
                 message.dirX = object.dirX | 0;
             if (object.dirY != null)
                 message.dirY = object.dirY | 0;
+            if (object.velX != null)
+                message.velX = object.velX | 0;
+            if (object.velY != null)
+                message.velY = object.velY | 0;
             if (object.speed != null)
                 message.speed = object.speed | 0;
             if (object.battleState != null)
@@ -1690,6 +1748,8 @@ $root.protos = (function() {
                 message.maxHp = object.maxHp | 0;
             if (object.characterState != null)
                 message.characterState = object.characterState | 0;
+            if (object.inAir != null)
+                message.inAir = Boolean(object.inAir);
             if (object.name != null)
                 message.name = String(object.name);
             if (object.displayName != null)
@@ -1718,6 +1778,8 @@ $root.protos = (function() {
                 object.virtualGridY = 0;
                 object.dirX = 0;
                 object.dirY = 0;
+                object.velX = 0;
+                object.velY = 0;
                 object.speed = 0;
                 object.battleState = 0;
                 object.joinIndex = 0;
@@ -1729,6 +1791,7 @@ $root.protos = (function() {
                 object.hp = 0;
                 object.maxHp = 0;
                 object.characterState = 0;
+                object.inAir = false;
                 object.name = "";
                 object.displayName = "";
                 object.avatar = "";
@@ -1743,6 +1806,10 @@ $root.protos = (function() {
                 object.dirX = message.dirX;
             if (message.dirY != null && message.hasOwnProperty("dirY"))
                 object.dirY = message.dirY;
+            if (message.velX != null && message.hasOwnProperty("velX"))
+                object.velX = message.velX;
+            if (message.velY != null && message.hasOwnProperty("velY"))
+                object.velY = message.velY;
             if (message.speed != null && message.hasOwnProperty("speed"))
                 object.speed = message.speed;
             if (message.battleState != null && message.hasOwnProperty("battleState"))
@@ -1765,6 +1832,8 @@ $root.protos = (function() {
                 object.maxHp = message.maxHp;
             if (message.characterState != null && message.hasOwnProperty("characterState"))
                 object.characterState = message.characterState;
+            if (message.inAir != null && message.hasOwnProperty("inAir"))
+                object.inAir = message.inAir;
             if (message.name != null && message.hasOwnProperty("name"))
                 object.name = message.name;
             if (message.displayName != null && message.hasOwnProperty("displayName"))
@@ -1812,6 +1881,7 @@ $root.protos = (function() {
          * @property {number|null} [dx] InputFrameDecoded dx
          * @property {number|null} [dy] InputFrameDecoded dy
          * @property {number|null} [btnALevel] InputFrameDecoded btnALevel
+         * @property {number|null} [btnBLevel] InputFrameDecoded btnBLevel
          */
 
         /**
@@ -1853,6 +1923,14 @@ $root.protos = (function() {
          */
         InputFrameDecoded.prototype.btnALevel = 0;
 
+        /**
+         * InputFrameDecoded btnBLevel.
+         * @member {number} btnBLevel
+         * @memberof protos.InputFrameDecoded
+         * @instance
+         */
+        InputFrameDecoded.prototype.btnBLevel = 0;
+
         /**
          * Creates a new InputFrameDecoded instance using the specified properties.
          * @function create
@@ -1883,6 +1961,8 @@ $root.protos = (function() {
                 writer.uint32(/* id 2, wireType 0 =*/16).int32(message.dy);
             if (message.btnALevel != null && Object.hasOwnProperty.call(message, "btnALevel"))
                 writer.uint32(/* id 3, wireType 0 =*/24).int32(message.btnALevel);
+            if (message.btnBLevel != null && Object.hasOwnProperty.call(message, "btnBLevel"))
+                writer.uint32(/* id 4, wireType 0 =*/32).int32(message.btnBLevel);
             return writer;
         };
 
@@ -1929,6 +2009,10 @@ $root.protos = (function() {
                         message.btnALevel = reader.int32();
                         break;
                     }
+                case 4: {
+                        message.btnBLevel = reader.int32();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -1973,6 +2057,9 @@ $root.protos = (function() {
             if (message.btnALevel != null && message.hasOwnProperty("btnALevel"))
                 if (!$util.isInteger(message.btnALevel))
                     return "btnALevel: integer expected";
+            if (message.btnBLevel != null && message.hasOwnProperty("btnBLevel"))
+                if (!$util.isInteger(message.btnBLevel))
+                    return "btnBLevel: integer expected";
             return null;
         };
 
@@ -1994,6 +2081,8 @@ $root.protos = (function() {
                 message.dy = object.dy | 0;
             if (object.btnALevel != null)
                 message.btnALevel = object.btnALevel | 0;
+            if (object.btnBLevel != null)
+                message.btnBLevel = object.btnBLevel | 0;
             return message;
         };
 
@@ -2014,6 +2103,7 @@ $root.protos = (function() {
                 object.dx = 0;
                 object.dy = 0;
                 object.btnALevel = 0;
+                object.btnBLevel = 0;
             }
             if (message.dx != null && message.hasOwnProperty("dx"))
                 object.dx = message.dx;
@@ -2021,6 +2111,8 @@ $root.protos = (function() {
                 object.dy = message.dy;
             if (message.btnALevel != null && message.hasOwnProperty("btnALevel"))
                 object.btnALevel = message.btnALevel;
+            if (message.btnBLevel != null && message.hasOwnProperty("btnBLevel"))
+                object.btnBLevel = message.btnBLevel;
             return object;
         };
 
@@ -3562,6 +3654,7 @@ $root.protos = (function() {
          * @property {number|null} [refRenderFrameId] InputsBufferSnapshot refRenderFrameId
          * @property {number|Long|null} [unconfirmedMask] InputsBufferSnapshot unconfirmedMask
          * @property {Array.<protos.InputFrameDownsync>|null} [toSendInputFrameDownsyncs] InputsBufferSnapshot toSendInputFrameDownsyncs
+         * @property {boolean|null} [shouldForceResync] InputsBufferSnapshot shouldForceResync
          */
 
         /**
@@ -3604,6 +3697,14 @@ $root.protos = (function() {
          */
         InputsBufferSnapshot.prototype.toSendInputFrameDownsyncs = $util.emptyArray;
 
+        /**
+         * InputsBufferSnapshot shouldForceResync.
+         * @member {boolean} shouldForceResync
+         * @memberof protos.InputsBufferSnapshot
+         * @instance
+         */
+        InputsBufferSnapshot.prototype.shouldForceResync = false;
+
         /**
          * Creates a new InputsBufferSnapshot instance using the specified properties.
          * @function create
@@ -3635,6 +3736,8 @@ $root.protos = (function() {
             if (message.toSendInputFrameDownsyncs != null && message.toSendInputFrameDownsyncs.length)
                 for (var i = 0; i < message.toSendInputFrameDownsyncs.length; ++i)
                     $root.protos.InputFrameDownsync.encode(message.toSendInputFrameDownsyncs[i], writer.uint32(/* id 3, wireType 2 =*/26).fork()).ldelim();
+            if (message.shouldForceResync != null && Object.hasOwnProperty.call(message, "shouldForceResync"))
+                writer.uint32(/* id 4, wireType 0 =*/32).bool(message.shouldForceResync);
             return writer;
         };
 
@@ -3683,6 +3786,10 @@ $root.protos = (function() {
                         message.toSendInputFrameDownsyncs.push($root.protos.InputFrameDownsync.decode(reader, reader.uint32()));
                         break;
                     }
+                case 4: {
+                        message.shouldForceResync = reader.bool();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -3733,6 +3840,9 @@ $root.protos = (function() {
                         return "toSendInputFrameDownsyncs." + error;
                 }
             }
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                if (typeof message.shouldForceResync !== "boolean")
+                    return "shouldForceResync: boolean expected";
             return null;
         };
 
@@ -3769,6 +3879,8 @@ $root.protos = (function() {
                     message.toSendInputFrameDownsyncs[i] = $root.protos.InputFrameDownsync.fromObject(object.toSendInputFrameDownsyncs[i]);
                 }
             }
+            if (object.shouldForceResync != null)
+                message.shouldForceResync = Boolean(object.shouldForceResync);
             return message;
         };
 
@@ -3794,6 +3906,7 @@ $root.protos = (function() {
                     object.unconfirmedMask = options.longs === String ? long.toString() : options.longs === Number ? long.toNumber() : long;
                 } else
                     object.unconfirmedMask = options.longs === String ? "0" : 0;
+                object.shouldForceResync = false;
             }
             if (message.refRenderFrameId != null && message.hasOwnProperty("refRenderFrameId"))
                 object.refRenderFrameId = message.refRenderFrameId;
@@ -3807,6 +3920,8 @@ $root.protos = (function() {
                 for (var j = 0; j < message.toSendInputFrameDownsyncs.length; ++j)
                     object.toSendInputFrameDownsyncs[j] = $root.protos.InputFrameDownsync.toObject(message.toSendInputFrameDownsyncs[j], options);
             }
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                object.shouldForceResync = message.shouldForceResync;
             return object;
         };
 
@@ -4453,6 +4568,11 @@ $root.protos = (function() {
          * @property {number|null} [spAtkLookupFrames] BattleColliderInfo spAtkLookupFrames
          * @property {number|null} [renderCacheSize] BattleColliderInfo renderCacheSize
          * @property {Object.<string,protos.MeleeBullet>|null} [meleeSkillConfig] BattleColliderInfo meleeSkillConfig
+         * @property {number|null} [snapIntoPlatformOverlap] BattleColliderInfo snapIntoPlatformOverlap
+         * @property {number|null} [snapIntoPlatformThreshold] BattleColliderInfo snapIntoPlatformThreshold
+         * @property {number|null} [jumpingInitVelY] BattleColliderInfo jumpingInitVelY
+         * @property {number|null} [gravityX] BattleColliderInfo gravityX
+         * @property {number|null} [gravityY] BattleColliderInfo gravityY
          */
 
         /**
@@ -4681,6 +4801,46 @@ $root.protos = (function() {
          */
         BattleColliderInfo.prototype.meleeSkillConfig = $util.emptyObject;
 
+        /**
+         * BattleColliderInfo snapIntoPlatformOverlap.
+         * @member {number} snapIntoPlatformOverlap
+         * @memberof protos.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.snapIntoPlatformOverlap = 0;
+
+        /**
+         * BattleColliderInfo snapIntoPlatformThreshold.
+         * @member {number} snapIntoPlatformThreshold
+         * @memberof protos.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.snapIntoPlatformThreshold = 0;
+
+        /**
+         * BattleColliderInfo jumpingInitVelY.
+         * @member {number} jumpingInitVelY
+         * @memberof protos.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.jumpingInitVelY = 0;
+
+        /**
+         * BattleColliderInfo gravityX.
+         * @member {number} gravityX
+         * @memberof protos.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.gravityX = 0;
+
+        /**
+         * BattleColliderInfo gravityY.
+         * @member {number} gravityY
+         * @memberof protos.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.gravityY = 0;
+
         /**
          * Creates a new BattleColliderInfo instance using the specified properties.
          * @function create
@@ -4766,6 +4926,16 @@ $root.protos = (function() {
                     writer.uint32(/* id 27, wireType 2 =*/218).fork().uint32(/* id 1, wireType 0 =*/8).int32(keys[i]);
                     $root.protos.MeleeBullet.encode(message.meleeSkillConfig[keys[i]], writer.uint32(/* id 2, wireType 2 =*/18).fork()).ldelim().ldelim();
                 }
+            if (message.snapIntoPlatformOverlap != null && Object.hasOwnProperty.call(message, "snapIntoPlatformOverlap"))
+                writer.uint32(/* id 28, wireType 1 =*/225).double(message.snapIntoPlatformOverlap);
+            if (message.snapIntoPlatformThreshold != null && Object.hasOwnProperty.call(message, "snapIntoPlatformThreshold"))
+                writer.uint32(/* id 29, wireType 1 =*/233).double(message.snapIntoPlatformThreshold);
+            if (message.jumpingInitVelY != null && Object.hasOwnProperty.call(message, "jumpingInitVelY"))
+                writer.uint32(/* id 30, wireType 0 =*/240).int32(message.jumpingInitVelY);
+            if (message.gravityX != null && Object.hasOwnProperty.call(message, "gravityX"))
+                writer.uint32(/* id 31, wireType 0 =*/248).int32(message.gravityX);
+            if (message.gravityY != null && Object.hasOwnProperty.call(message, "gravityY"))
+                writer.uint32(/* id 32, wireType 0 =*/256).int32(message.gravityY);
             return writer;
         };
 
@@ -4961,6 +5131,26 @@ $root.protos = (function() {
                         message.meleeSkillConfig[key] = value;
                         break;
                     }
+                case 28: {
+                        message.snapIntoPlatformOverlap = reader.double();
+                        break;
+                    }
+                case 29: {
+                        message.snapIntoPlatformThreshold = reader.double();
+                        break;
+                    }
+                case 30: {
+                        message.jumpingInitVelY = reader.int32();
+                        break;
+                    }
+                case 31: {
+                        message.gravityX = reader.int32();
+                        break;
+                    }
+                case 32: {
+                        message.gravityY = reader.int32();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -5099,6 +5289,21 @@ $root.protos = (function() {
                     }
                 }
             }
+            if (message.snapIntoPlatformOverlap != null && message.hasOwnProperty("snapIntoPlatformOverlap"))
+                if (typeof message.snapIntoPlatformOverlap !== "number")
+                    return "snapIntoPlatformOverlap: number expected";
+            if (message.snapIntoPlatformThreshold != null && message.hasOwnProperty("snapIntoPlatformThreshold"))
+                if (typeof message.snapIntoPlatformThreshold !== "number")
+                    return "snapIntoPlatformThreshold: number expected";
+            if (message.jumpingInitVelY != null && message.hasOwnProperty("jumpingInitVelY"))
+                if (!$util.isInteger(message.jumpingInitVelY))
+                    return "jumpingInitVelY: integer expected";
+            if (message.gravityX != null && message.hasOwnProperty("gravityX"))
+                if (!$util.isInteger(message.gravityX))
+                    return "gravityX: integer expected";
+            if (message.gravityY != null && message.hasOwnProperty("gravityY"))
+                if (!$util.isInteger(message.gravityY))
+                    return "gravityY: integer expected";
             return null;
         };
 
@@ -5204,6 +5409,16 @@ $root.protos = (function() {
                     message.meleeSkillConfig[keys[i]] = $root.protos.MeleeBullet.fromObject(object.meleeSkillConfig[keys[i]]);
                 }
             }
+            if (object.snapIntoPlatformOverlap != null)
+                message.snapIntoPlatformOverlap = Number(object.snapIntoPlatformOverlap);
+            if (object.snapIntoPlatformThreshold != null)
+                message.snapIntoPlatformThreshold = Number(object.snapIntoPlatformThreshold);
+            if (object.jumpingInitVelY != null)
+                message.jumpingInitVelY = object.jumpingInitVelY | 0;
+            if (object.gravityX != null)
+                message.gravityX = object.gravityX | 0;
+            if (object.gravityY != null)
+                message.gravityY = object.gravityY | 0;
             return message;
         };
 
@@ -5257,6 +5472,11 @@ $root.protos = (function() {
                 object.virtualGridToWorldRatio = 0;
                 object.spAtkLookupFrames = 0;
                 object.renderCacheSize = 0;
+                object.snapIntoPlatformOverlap = 0;
+                object.snapIntoPlatformThreshold = 0;
+                object.jumpingInitVelY = 0;
+                object.gravityX = 0;
+                object.gravityY = 0;
             }
             if (message.stageName != null && message.hasOwnProperty("stageName"))
                 object.stageName = message.stageName;
@@ -5326,6 +5546,16 @@ $root.protos = (function() {
                 for (var j = 0; j < keys2.length; ++j)
                     object.meleeSkillConfig[keys2[j]] = $root.protos.MeleeBullet.toObject(message.meleeSkillConfig[keys2[j]], options);
             }
+            if (message.snapIntoPlatformOverlap != null && message.hasOwnProperty("snapIntoPlatformOverlap"))
+                object.snapIntoPlatformOverlap = options.json && !isFinite(message.snapIntoPlatformOverlap) ? String(message.snapIntoPlatformOverlap) : message.snapIntoPlatformOverlap;
+            if (message.snapIntoPlatformThreshold != null && message.hasOwnProperty("snapIntoPlatformThreshold"))
+                object.snapIntoPlatformThreshold = options.json && !isFinite(message.snapIntoPlatformThreshold) ? String(message.snapIntoPlatformThreshold) : message.snapIntoPlatformThreshold;
+            if (message.jumpingInitVelY != null && message.hasOwnProperty("jumpingInitVelY"))
+                object.jumpingInitVelY = message.jumpingInitVelY;
+            if (message.gravityX != null && message.hasOwnProperty("gravityX"))
+                object.gravityX = message.gravityX;
+            if (message.gravityY != null && message.hasOwnProperty("gravityY"))
+                object.gravityY = message.gravityY;
             return object;
         };
 
@@ -5369,6 +5599,7 @@ $root.protos = (function() {
          * @property {number|Long|null} [countdownNanos] RoomDownsyncFrame countdownNanos
          * @property {Array.<protos.MeleeBullet>|null} [meleeBullets] RoomDownsyncFrame meleeBullets
          * @property {number|Long|null} [backendUnconfirmedMask] RoomDownsyncFrame backendUnconfirmedMask
+         * @property {boolean|null} [shouldForceResync] RoomDownsyncFrame shouldForceResync
          */
 
         /**
@@ -5428,6 +5659,14 @@ $root.protos = (function() {
          */
         RoomDownsyncFrame.prototype.backendUnconfirmedMask = $util.Long ? $util.Long.fromBits(0,0,true) : 0;
 
+        /**
+         * RoomDownsyncFrame shouldForceResync.
+         * @member {boolean} shouldForceResync
+         * @memberof protos.RoomDownsyncFrame
+         * @instance
+         */
+        RoomDownsyncFrame.prototype.shouldForceResync = false;
+
         /**
          * Creates a new RoomDownsyncFrame instance using the specified properties.
          * @function create
@@ -5466,6 +5705,8 @@ $root.protos = (function() {
                     $root.protos.MeleeBullet.encode(message.meleeBullets[i], writer.uint32(/* id 4, wireType 2 =*/34).fork()).ldelim();
             if (message.backendUnconfirmedMask != null && Object.hasOwnProperty.call(message, "backendUnconfirmedMask"))
                 writer.uint32(/* id 5, wireType 0 =*/40).uint64(message.backendUnconfirmedMask);
+            if (message.shouldForceResync != null && Object.hasOwnProperty.call(message, "shouldForceResync"))
+                writer.uint32(/* id 6, wireType 0 =*/48).bool(message.shouldForceResync);
             return writer;
         };
 
@@ -5541,6 +5782,10 @@ $root.protos = (function() {
                         message.backendUnconfirmedMask = reader.uint64();
                         break;
                     }
+                case 6: {
+                        message.shouldForceResync = reader.bool();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -5608,6 +5853,9 @@ $root.protos = (function() {
             if (message.backendUnconfirmedMask != null && message.hasOwnProperty("backendUnconfirmedMask"))
                 if (!$util.isInteger(message.backendUnconfirmedMask) && !(message.backendUnconfirmedMask && $util.isInteger(message.backendUnconfirmedMask.low) && $util.isInteger(message.backendUnconfirmedMask.high)))
                     return "backendUnconfirmedMask: integer|Long expected";
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                if (typeof message.shouldForceResync !== "boolean")
+                    return "shouldForceResync: boolean expected";
             return null;
         };
 
@@ -5663,6 +5911,8 @@ $root.protos = (function() {
                     message.backendUnconfirmedMask = object.backendUnconfirmedMask;
                 else if (typeof object.backendUnconfirmedMask === "object")
                     message.backendUnconfirmedMask = new $util.LongBits(object.backendUnconfirmedMask.low >>> 0, object.backendUnconfirmedMask.high >>> 0).toNumber(true);
+            if (object.shouldForceResync != null)
+                message.shouldForceResync = Boolean(object.shouldForceResync);
             return message;
         };
 
@@ -5695,6 +5945,7 @@ $root.protos = (function() {
                     object.backendUnconfirmedMask = options.longs === String ? long.toString() : options.longs === Number ? long.toNumber() : long;
                 } else
                     object.backendUnconfirmedMask = options.longs === String ? "0" : 0;
+                object.shouldForceResync = false;
             }
             if (message.id != null && message.hasOwnProperty("id"))
                 object.id = message.id;
@@ -5719,6 +5970,8 @@ $root.protos = (function() {
                     object.backendUnconfirmedMask = options.longs === String ? String(message.backendUnconfirmedMask) : message.backendUnconfirmedMask;
                 else
                     object.backendUnconfirmedMask = options.longs === String ? $util.Long.prototype.toString.call(message.backendUnconfirmedMask) : options.longs === Number ? new $util.LongBits(message.backendUnconfirmedMask.low >>> 0, message.backendUnconfirmedMask.high >>> 0).toNumber(true) : message.backendUnconfirmedMask;
+            if (message.shouldForceResync != null && message.hasOwnProperty("shouldForceResync"))
+                object.shouldForceResync = message.shouldForceResync;
             return object;
         };
 

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();
+// Check collision for player1
-
+const potentials = playerCollider1.potentials();
-for (const barrier of potentials) {
+for (const potential of potentials) {
-  if (!playerCollider.collides(barrier, result)) continue;
+  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}`);