Disable frame advance if facing a bot

Source/Core/Core/HW/EXI_DeviceSlippi.cpp

@@ -1486,6 +1486,11 @@ bool CEXISlippi::shouldSkipOnlineFrame(s32 frame, s32 finalizedFrame)
 
 bool CEXISlippi::shouldAdvanceOnlineFrame(s32 frame)
 {
+	// If the opponent is a bot running ahead to give us more inputs, we should
+	// just keep going at our own pace rather than trying to catch up.
+	if (opponentRunahead())
+		return false;
+
 	// Logic below is used to test frame advance by forcing it more often
 	// SConfig::GetInstance().m_EmulationSpeed = 0.5f;
 	// if (frame > 120 && frame % 10 < 3)
@@ -1610,6 +1615,24 @@ void CEXISlippi::handleSendInputs(s32 frame, u8 delay, s32 checksumFrame, u32 ch
 	slippi_netplay->SendSlippiPad(std::move(pad));
 }
 
+bool CEXISlippi::opponentRunahead()
+{
+	// Bot players might be running ahead to "donate" their delay frames to us.
+
+	// Only registered bot accounts are allowed to do this.
+	auto player_info = matchmaking->GetPlayerInfo();
+	for (int i = 0; i < player_info.size(); i++)
+	{
+		if (i == matchmaking->LocalPlayerIndex())
+			continue;
+
+		if (!player_info[i].isBot)
+			return false;
+	}
+
+	return true;
+}
+
 void CEXISlippi::prepareOpponentInputs(s32 frame, bool shouldSkip)
 {
 	m_read_queue.clear();

Source/Core/Core/HW/EXI_DeviceSlippi.h

@@ -210,6 +210,7 @@ class CEXISlippi : public IEXIDevice
 	void setMatchSelections(u8 *payload);
 	bool shouldSkipOnlineFrame(s32 frame, s32 finalizedFrame);
 	bool shouldAdvanceOnlineFrame(s32 frame);
+	bool opponentRunahead();
 	void handleLogInRequest();
 	void handleLogOutRequest();
 	void handleUpdateAppRequest();

Source/Core/Core/Slippi/SlippiMatchmaking.cpp

@@ -511,6 +511,7 @@ void SlippiMatchmaking::handleMatchmaking()
 			playerInfo.displayName = el.value("displayName", "");
 			playerInfo.connectCode = el.value("connectCode", "");
 			playerInfo.port = el.value("port", 0);
+			playerInfo.isBot = el.value("isBot", false);
 
 			if (el["chatMessages"].is_array())
 			{

Source/Core/Core/Slippi/SlippiUser.h

@@ -31,6 +31,8 @@ class SlippiUser
 		int port;
 
 		std::vector<std::string> chatMessages;
+
+		bool isBot = false;
 	};
 
 	SlippiUser(uintptr_t rs_exi_device_ptr);