experimental: AutoJoin, join players immediately (or as soon as possible) when enough coins are inserted

stepmania/src/GameState.cpp

@@ -103,6 +103,7 @@ static ThemeMetric<bool> ARE_STAGE_PLAYER_MODS_FORCED( "GameState","AreStagePlay
 static ThemeMetric<bool> ARE_STAGE_SONG_MODS_FORCED( "GameState","AreStageSongModsForced" );
 
 static Preference<Premium> g_Premium( "Premium", Premium_Off );
+Preference<bool> GameState::m_bAutoJoin( "AutoJoin", false );
 
 GameState::GameState() :
 	m_pCurGame(			Message_CurrentGameChanged ),
@@ -413,6 +414,17 @@ bool GameState::JoinInput( PlayerNumber pn )
 	return true;
 }
 
+bool GameState::JoinPlayers()
+{
+	bool bJoined = false;
+	FOREACH_PlayerNumber( pn )
+	{
+		if( JoinInput(pn) )
+			bJoined = true;
+	}
+	return bJoined;
+}
+
 int GameState::GetCoinsNeededToJoin() const
 {
 	int iCoinsToCharge = 0;

stepmania/src/GameState.h

@@ -12,6 +12,7 @@
 #include "RageTimer.h"
 #include "PlayerOptions.h"
 #include "SongOptions.h"
+#include "Preference.h"
 
 #include <map>
 #include <deque>
@@ -45,6 +46,7 @@ public:
 	void JoinPlayer( PlayerNumber pn );
 	void UnjoinPlayer( PlayerNumber pn );
 	bool JoinInput( PlayerNumber pn );
+	bool JoinPlayers();
 	void LoadProfiles( bool bLoadEdits = true );
 	void SaveProfiles();
 	void SaveProfile( PlayerNumber pn );
@@ -301,10 +303,14 @@ public:
 	PlayerState* m_pMultiPlayerState[NUM_MultiPlayer];
 
 	//
-	// Preference wrappers
+	// Preferences
+	//
+	static Preference<bool> m_bAutoJoin;
+
 	//
 	// These options have weird interactions depending on m_bEventMode, 
 	// so wrap them
+	//
 	bool		m_bTemporaryEventMode;
 	bool		IsEventMode() const;
 	CoinMode	GetCoinMode() const;

stepmania/src/ScreenWithMenuElements.cpp

@@ -127,6 +127,15 @@ void ScreenWithMenuElements::BeginScreen()
 
 	/* Evaluate FirstUpdateCommand. */
 	this->PlayCommand( "FirstUpdate" );
+
+	/* If AutoJoin is enabled, we may have a credit that couldn't be used to join when
+	 * the coin was inserted due to AllowLateJoin being disabled at the time.  Try to
+	 * join players when a new screen starts. */
+	if( GAMESTATE->m_bAutoJoin.Get() )
+	{
+		if( GAMESTATE->JoinPlayers() )
+			SCREENMAN->PlayStartSound();
+	}
 }
 
 void ScreenWithMenuElements::HandleScreenMessage( const ScreenMessage SM )

stepmania/src/StepMania.cpp

@@ -1198,6 +1198,13 @@ void StepMania::InsertCoin( int iNum, bool bCountInBookkeeping )
 	else
 		SCREENMAN->PlayInvalidSound();
 
+	/* If AutoJoin and enough coins to join have been inserted, then try to join a player. */
+	if( GAMESTATE->m_bAutoJoin.Get() )
+	{
+		if( GAMESTATE->JoinPlayers() )
+			SCREENMAN->PlayStartSound();
+	}
+
 	Message msg( "CoinInserted" );
 	// below params are unused
 	//msg.SetParam( "Coins", GAMESTATE->m_iCoins );