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feat: implement grace window for player input handling in game loop

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This commit is contained in:
Sebastian Benjamin (aider) 2025-06-03 18:08:04 -07:00
parent 027e513e65
commit 99e6ce9699
1 changed files with 22 additions and 3 deletions
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25
server/game-modes/battle-royale/game-loop.go
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@ -24,7 +24,9 @@ func CheckMatchTerminate(lobbyState *MatchState, logger *runtime.Logger) bool {
return false return false
} }
func RespondToInput(lobbyState *MatchState, messages []runtime.MatchData, logger *runtime.Logger) { const GRACE_WINDOW_TICKS = 15
func RespondToInput(lobbyState *MatchState, messages []runtime.MatchData, logger *runtime.Logger, tick int64, dispatcher *runtime.MatchDispatcher) {
for _, msg := range messages { for _, msg := range messages {
_, exists := lobbyState.presences[msg.GetSessionId()] _, exists := lobbyState.presences[msg.GetSessionId()]
if !exists { if !exists {
@ -32,7 +34,24 @@ func RespondToInput(lobbyState *MatchState, messages []runtime.MatchData, logger
continue continue
} }
// Parse player message // Check if the input is within the grace window
if msg.GetTick() < tick && tick-msg.GetTick() <= GRACE_WINDOW_TICKS {
// Replay the game state for the intervening ticks
for t := msg.GetTick(); t < tick; t++ {
// Apply the input to the player's state
lobbyState.presences[msg.GetSessionId()].stageState.BoundsCheckedMove(update.X, update.Y)
// Check if the player survives after applying the input
if lobbyState.presences[msg.GetSessionId()].stageState.CheckDeathState(t) == PLAYER_ALIVE {
// Send a cancel death message to the client
cancelDeathMessage := map[string]any{
"cancelDeath": true,
}
data, _ := json.Marshal(cancelDeathMessage)
(*dispatcher).BroadcastMessage(CANCEL_DEATH, data, []runtime.Presence{msg.GetPresence()}, nil, true)
break
}
}
}
var update ClientUpdate var update ClientUpdate
if err := json.Unmarshal(msg.GetData(), &update); err != nil { if err := json.Unmarshal(msg.GetData(), &update); err != nil {
(*logger).Warn("Failed to parse input: %v", err) (*logger).Warn("Failed to parse input: %v", err)
@ -115,7 +134,7 @@ func (m *Match) MatchLoop(ctx context.Context, logger runtime.Logger, db *sql.DB
return nil return nil
} }
RespondToInput(lobbyState, messages, &logger) RespondToInput(lobbyState, messages, &logger, tick, &dispatcher)
BroadcastToPresences(tick, lobbyState, &logger, &dispatcher) BroadcastToPresences(tick, lobbyState, &logger, &dispatcher)
return lobbyState return lobbyState