クロスプラットフォームのマッチメイキングを設定する

Last updated on September 10, 2024

Overview​

Cross-platform play (cross-play) enables players on any platform your game supports to play together. While this is generally the preferred experience for players, some platforms require that games support the ability for players to opt-out.

AccelByte Gaming Services (AGS) Matchmaking defaults with cross-play on, but can be configured to support player control using custom parameters passed from the game client to the service when requesting a match. This allows players to fully opt in or out of cross-play, or choose a subset of platforms they would prefer to match with. The player session attribute can also be used to configure the player preference.

This article will show you how to configure a match ruleset to support cross-play validation and pass a player's preferences as a custom parameter as part of the matchmaking process.

注記

This guide assumes you are using the default match function available with AGS Matchmaking. If you plan to write your own function using AGS Extend, your required logic may differ.

Goals​

This article aims to provide an overview of how to configure a match ruleset to respect a player's choice for opting in or out of cross-play and show you how to submit a match ticket with a custom parameter related to that choice.

Prerequisites​

In order to complete all the steps in this article, you will need:

Configure a match ruleset to support custom parameters​

To support player control, you need to configure a match ruleset with custom parameter criteria specific to cross-play. To do this, you need to update the ruleset JSON configuration to include match options, as the below example illustrates.

In the below example, it's assumed your game is a four-player co-op game and has been released on Steam, Xbox Live (XBL), and PlayStation Network (PSN). In the ruleset JSON, you can see a match option with the name cross_platform has been added with the type all. The name of the option will act as the key for the values to be passed as a parameter from the game client. Type allows you to define the criteria used to evaluate the passed values, and can be set to one of these options:

  • All - Players must be matched with others who have the same parameters and values.
  • Any - Players must be matched with others who have the same option parameter name and at least one matching value.
  • Unique - Players must be matched with others who have the same option parameter name, but different values.

Because all is set in this example, only players who have the exact matching values as their preference can be matched together. For example, if one player set Steam and another set XBL and Steam, they would not be able to match.

{
    "auto_backfill": true,
    "alliance": {
        "min_number": 1,
        "max_number": 1,
        "player_min_number": 4,
        "player_max_number": 4
    },
    "match_options": {
        "options": [
            {
                "name": "cross_platform",
                "type": "all"
            }
        ]
    }
}

Add the player cross-play selection to the matchmaking request in the game client​

Once a match ruleset is configured, you can update the matchmaking call in the game client to support passing player preferences as custom parameters as part of the match request.

Below are examples of how the passed values will be interpreted with example codes showing how to pass custom parameters from the game client as part of the matchmaking request.

  • Player wants to cross-play with any platform user:
    • "cross_platform": ["steam", "xbl", "ps5", "ps4"]
  • Player wants to play only with other XBL platform users:
    • "cross_platform": ["xbl"]
  • Player wants to cross-play with only console users (no PC users):
    • "cross_platform": ["xbl", "ps5", "ps4"]
備考

The backend will do a validation to prevent malicious players from tampering the cross_platform value. The backend will check the cross_platform value sent by a player if it contains the player's active platform. For example, when a Steam player sends a cross_platform value of ["ps5", "ps4"], the backend will add steam into the value, e.g., ["steam", "ps5", "ps4"].

const IOnlineSubsystem* Subsystem = Online::GetSubsystem(GetWorld());
if (!ensure(Subsystem != nullptr))
{
    return;
}

const FOnlineSessionAccelBytePtr SessionInterface = StaticCastSharedPtr<FOnlineSessionV2AccelByte>(Subsystem->GetSessionInterface());
if (!ensure(SessionInterface.IsValid()))
{
    return;
}
const FUniqueNetIdPtr LocalPlayerId = GetUniquePlayerId();
if (!ensure(LocalPlayerId.IsValid()))
{
    return false;
}

// Create a new search handle instance for matchmaking. IMPORTANT: you will need to set the match pool that you are searching for with SETTING_SESSION_MATCHPOOL, as shown below.
TSharedRef<FOnlineSessionSearch> MatchmakingSearchHandle = MakeShared<FOnlineSessionSearch>();
MatchmakingSearchHandle->QuerySettings.Set(SETTING_SESSION_MATCHPOOL, FString(TEXT("YOUR_MATCHPOOL_NAME_GOES_HERE")), EOnlineComparisonOp::Equals);

// Custom attributes can be added to the SearchHandle's QuerySettings:
MatchmakingSearchHandle->QuerySettings.Set(
    FName(TEXT("cross_platform")),
    TEXT("steam"), EOnlineComparisonOp::Equals);

// Bind a function that has a return type of void and these parameters:
// FName SessionName, bool bWasSuccessful
const FOnMatchmakingCompleteDelegate OnMatchmakingCompleteDelegate = /* Bind to lambda or class method */;
SessionInterface->AddOnMatchmakingCompleteDelegate_Handle(OnMatchmakingCompleteDelegate);

if (SessionInterface->StartMatchmaking(USER_ID_TO_MATCHMAKING_USER_ARRAY(LocalPlayerId.ToSharedRef()), NAME_GameSession, FOnlineSessionSettings(), MatchmakingSearchHandle, OnStartMatchmakingCompleteDelegate))
{
    // Update the current search result handle class member with the search handle passed to AGS Matchmaking.
    CurrentMatchmakingSearchHandle = MatchmakingSearchHandle;
}

Setting up the cross_platform in the matchmaking ticket request gives the game client the flexibility to control the platforms for cross-play. However, it will require a game client change when adding additional platforms in the future. The second way to configure the player cross-play preference is using the player session attribute. By setting the player session attribute crossplayEnabled to true or false, the backend will populate the cross_platform value even when there is no cross_platform attribute in the match ticket.

  • crossplayEnabled:true: if the match ticket doesn't contain the cross_platform attribute, the matchmaking will populate cross_platform with all active login methods that are being configured in the game namespace.
  • crossplayEnabled:false: if the match ticket doesn't contain the cross_platform attribute, the matchmaking will populate cross_platform with the current platform where the player is logged in.

Example case​

In this scenario, the game is being distributed in Steam, PS5, and Xbox.

Player PlatformCross-play EnabledCross Platform value
Steamtrue["steam", "ps5", "xbox"]
PS5false["ps5"]
PS5true["steam", "ps5", "xbox"]
Xboxfalse["xbox"]
備考

When setting the session attribute, there will be validation in the backend for the currentPlatform and platforms information. The currentPlatform value can only be a platform in which the player is logged in. Theplatforms value can only be the active login methods in the current game namespace. Hence, the player cannot tamper the value with a wrong information.

Manage the cross-play via match pool​

When the ruleset contains cross_platform in the match options, admins can configure the match pool behavior from the match pool config. The cross-play config in the match pool will take precedence over the player's cross-play preference.

...
    "match_options": {
        "options": [
            {
                "name": "cross_platform",
                "type": "all"
            }
        ]
    }
...

There are three cross-play options that can be set in the match pool configuration:

Match Pool Cross-play config

  • Cross-Play: by default, AGS is cross-play enabled.
  • Platform Group: all match tickets in the match pool (queue) will play with their platform group, regardless of the player's cross-play preference (player session attribute or match ticket's cross_platform value).
  • Platform Exclusive: all match tickets in the match pool (queue) will play with their own platform, regardless of the player's cross-play preference (player session attribute or match ticket cross_platform value).
Admin intentionPlayers intentionResult
Game admins DISABLE the cross-platform play on the match pool.Players want a cross-platform play.Players will only play with the same platform or platform group. (SAME PLATFORM PLAY)
Game admins DISABLE the cross-platform play on the match pool.Players do not want a cross-platform play.Players will only play with the same platform or platform group. (SAME PLATFORM PLAY)
Game admins ENABLE the cross-platform play on the match pool.Players want a cross-platform play.Players can play with other platforms. (CROSS-PLATFORM PLAY)
Game admins ENABLE the cross-platform play on the match pool.Players do not want a cross-platform play.Players will only play with the same platform. (SAME PLATFORM PLAY)

Cross-play for party session​

In matchmaking with a party, parties can consist of players on multiple platforms. If the game sends the cross-play preference using the match ticket attribute cross_platform, regardless of the party composition, the cross_platform value will be used to search the potential platforms to match. However, if the game uses the player session attribute, then the party leader's preference will be used for matchmaking. The behavior of the game only using the party session attributes can be seen in the following table:

Party Leader PlatformCross-play enabledParty CompositionMatch pool ConfigBehavior
Steamtruesame platformenable cross-playWill match with all platforms
Steamtruesame platformdisable cross-playWill match with the same platform (Steam)
Steamtruemixed platformsenable cross-playWill match with all platforms
Steamtruemixed platformsdisable cross-playWill fail to create a match ticket
Steamfalsesame platformenable cross-playWill match with the same platform (Steam)
Steamfalsesame platformdisable cross-playWill match with the same platform (Steam)
Steamfalsemixed platformsenable cross-playWill match with the same platform (Steam)
Steamfalsemixed platformsdisable cross-playWill fail to create a match ticket

Platform group​

Admins need to set up the platform group to enable Platform Group cross-play in the match pool. Players can still play with other platforms when the cross-play preference is disabled if they are within the same platform group.

Match Pool Cross-play config

Sample case​

The following is an example use case that uses the platform group:

"As a game developer, I want to allow desktop players to only match and play with each other, and console players to only match and play with each other, but I don't want desktop players and console players to match with each other."

How should I set up the platform group?"

For this case, you can set up the platform group as follows

  • desktop: steam, epicgames
  • console: ps5, xbox
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