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2 Commits

Author SHA1 Message Date
genxium
ec2a21dbe7 Minor fix for "false == Room.BackendDynamicsEnabled". 2022-10-31 09:02:14 +08:00
Wing
dc6402c2b7 Updated README. 2022-10-26 10:28:32 +08:00
3 changed files with 25 additions and 11 deletions

View File

@@ -3,9 +3,12 @@
This project is a demo for a websocket-based input synchronization method inspired by [GGPO](https://www.ggpo.net/).
![screenshot-1](./screenshot-1.png)
Please checkout [this demo video](https://pan.baidu.com/s/1aM6e8IWaJszFCYAsRjt19g?pwd=z02c) to see whether the source codes are doing what you expect for synchronization.
Please checkout [this demo video](https://pan.baidu.com/s/123LlWcT9X-wbcYybqYnvmA?pwd=qrlw) to see whether the source codes are doing what you expect for synchronization.
The video mainly shows the following feature (yet I'm not surprised if they're not obvious): when a player didn't have its input arrived at the backend in time (e.g. due to local lag, network delay or reconnection), backend forces confirmation of a prediction of its own and sends the confirmed input together w/ a reference render frame to that player.
The video mainly shows the following features.
- The backend receives inputs from frontend peers and [by a GGPO-alike manner](https://github.com/pond3r/ggpo/blob/master/doc/README.md) broadcasts back for synchronization.
- The game is recovered for a player upon reconnection.
- Both backend(Golang) and frontend(JavaScript) execute collision detection and handle collision contacts by the same algorithm. The backend dynamics can be toggled off by [Room.BackendDynamicsEnabled](https://github.com/genxium/DelayNoMore/blob/v0.5.2/battle_srv/models/room.go#L813), but **when turned off the game couldn't support recovery upon reconnection**.
# 1. Building & running

View File

@@ -2,12 +2,17 @@ package models
import (
. "dnmshared"
"encoding/xml"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/gorilla/websocket"
"github.com/solarlune/resolv"
"go.uber.org/zap"
"io/ioutil"
"math"
"math/rand"
"os"
"path/filepath"
. "server/common"
"server/common/utils"
pb "server/pb_output"
@@ -15,11 +20,6 @@ import (
"sync"
"sync/atomic"
"time"
"encoding/xml"
"io/ioutil"
"os"
"path/filepath"
)
const (
@@ -459,9 +459,9 @@ func (pR *Room) StartBattle() {
pR.prefabInputFrameDownsync(noDelayInputFrameId)
}
// Force setting all-confirmed of buffered inputFrames periodically
unconfirmedMask := uint64(0)
if pR.BackendDynamicsEnabled {
// Force setting all-confirmed of buffered inputFrames periodically
unconfirmedMask = pR.forceConfirmationIfApplicable()
} else {
pR.markConfirmationIfApplicable()
@@ -474,7 +474,7 @@ func (pR *Room) StartBattle() {
If "NstDelayFrames" becomes larger, "pR.RenderFrameId - refRenderFrameId" possibly becomes larger because the force confirmation is delayed more.
Hence even upon resync, it's still possible that "refRenderFrameId < frontend.chaserRenderFrameId".
Upon resync, it's still possible that "refRenderFrameId < frontend.chaserRenderFrameId" -- and this is allowed.
*/
refRenderFrameId := pR.ConvertToGeneratingRenderFrameId(upperToSendInputFrameId) + (1 << pR.InputScaleFrames) - 1
if refRenderFrameId > pR.RenderFrameId {
@@ -539,7 +539,7 @@ func (pR *Room) StartBattle() {
// [WARNING] When sending DOWNSYNC_MSG_ACT_FORCED_RESYNC, there MUST BE accompanying "toSendInputFrames" for calculating "refRenderFrameId"!
if MAGIC_LAST_SENT_INPUT_FRAME_ID_READDED == player.LastSentInputFrameId {
Logger.Warn(fmt.Sprintf("Not sending due to empty toSendInputFrames: roomId=%v, playerId=%v, refRenderFrameId=%v, candidateToSendInputFrameId=%v, upperToSendInputFrameId=%v, lastSentInputFrameId=%v, playerAckingInputFrameId=%v", pR.Id, playerId, refRenderFrameId, candidateToSendInputFrameId, upperToSendInputFrameId, player.LastSentInputFrameId, player.AckingInputFrameId))
Logger.Warn(fmt.Sprintf("Not sending due to empty toSendInputFrames: roomId=%v, playerId=%v, refRenderFrameId=%v, upperToSendInputFrameId=%v, lastSentInputFrameId=%v, playerAckingInputFrameId=%v", pR.Id, playerId, refRenderFrameId, upperToSendInputFrameId, player.LastSentInputFrameId, player.AckingInputFrameId))
}
continue
}
@@ -567,6 +567,17 @@ func (pR *Room) StartBattle() {
}
toApplyInputFrameId := pR.ConvertToInputFrameId(refRenderFrameId, pR.InputDelayFrames)
if false == pR.BackendDynamicsEnabled {
// When "false == pR.BackendDynamicsEnabled", the variable "refRenderFrameId" is not well defined
minLastSentInputFrameId := int32(math.MaxInt32)
for _, player := range pR.Players {
if player.LastSentInputFrameId >= minLastSentInputFrameId {
continue
}
minLastSentInputFrameId = player.LastSentInputFrameId
}
toApplyInputFrameId = minLastSentInputFrameId
}
for pR.InputsBuffer.N < pR.InputsBuffer.Cnt || (0 < pR.InputsBuffer.Cnt && pR.InputsBuffer.StFrameId < toApplyInputFrameId) {
f := pR.InputsBuffer.Pop().(*pb.InputFrameDownsync)
if pR.inputFrameIdDebuggable(f.InputFrameId) {

View File

@@ -440,7 +440,7 @@
"array": [
0,
0,
344.75930058781137,
216.05530045313827,
0,
0,
0,