Add multiplayer XP sharing

Author: gijsgroenewegen

main.cpp

@@ -58,6 +58,32 @@ class Mod : GenericMod {
 	};
 
 	std::vector<cube::TextFX> m_FXList;
+
+	void GainXP(cube::Game* game, int xp)
+	{
+		FloatRGBA purple(0.65f, 0.40f, 1.0f, 1.0f);
+		wchar_t buffer[250];
+		swprintf_s(buffer, 250, L"You gain %d xp.\n", xp);
+		game->PrintMessage(buffer, &purple);
+
+		cube::TextFX xpText = cube::TextFX();
+		xpText.position = game->GetPlayer()->entity_data.position + LongVector3(std::rand() % (cube::DOTS_PER_BLOCK * 50), std::rand() % (cube::DOTS_PER_BLOCK * 50), std::rand() % (cube::DOTS_PER_BLOCK * 50));
+		xpText.animation_length = 3000;
+		xpText.distance_to_fall = -100;
+		xpText.color = purple;
+		xpText.size = 32;
+		xpText.offset_2d = FloatVector2(-50, -100);
+		xpText.text = std::wstring(L"+") + std::to_wstring(xp) + std::wstring(L" XP");;
+		xpText.field_60 = 0;
+
+		for (int i = 0; i < 4; i++)
+		{
+			m_FXList.push_back(xpText);
+		}
+
+		game->GetPlayer()->entity_data.XP += xp;
+	}
+
 	/* Hook for the chat function. Triggers when a user sends something in the chat.
 	 * @param	{std::wstring*} message
 	 * @return	{int}
@@ -162,6 +188,24 @@ class Mod : GenericMod {
 			}
 		}
 
+		uint32 size = 0;
+		if (cube::SteamNetworking()->IsP2PPacketAvailable(&size, 2))
+		{
+			u8 buffer[size];
+			CSteamID id;
+			cube::SteamNetworking()->ReadP2PPacket(&buffer, size, &size, &id, 2);
+
+			BytesIO package(buffer, size);
+
+			int pkg_id = package.Read<int>();
+			int xp = package.Read<int>();
+
+			if (pkg_id == 0x1)
+			{
+				GainXP(game, xp);
+			}
+		}
+
 		return;
 	}
 
@@ -189,10 +233,10 @@ class Mod : GenericMod {
 			return;
 		}
 
-		cube::Creature* player = game->GetPlayer();
-		if (player->id == attacker->id || player->pet_id == attacker->id)
+		if (attacker->entity_data.hostility_type == cube::Creature::EntityBehaviour::Player ||
+			attacker->entity_data.hostility_type == cube::Creature::EntityBehaviour::Pet)
 		{
-			FloatRGBA purple(0.65f, 0.40f, 1.0f, 1.0f);
+			
 			int xp_gain = GetCreatureLevel(creature) * (creature->entity_data.level + 1);
 
 			if ((creature->entity_data.appearance.flags2 & (1 << (int)cube::Creature::AppearanceModifiers::IsBoss)) != 0)
@@ -210,26 +254,23 @@ class Mod : GenericMod {
 				xp_gain *= 2;
 			}
 
-			wchar_t buffer[250];
-			swprintf_s(buffer, 250, L"You gain %d xp.\n", xp_gain);
-			game->PrintMessage(buffer, &purple);
-
-			cube::TextFX xpText = cube::TextFX();
-			xpText.position = player->entity_data.position + LongVector3(std::rand() % (cube::DOTS_PER_BLOCK * 50) , std::rand() % (cube::DOTS_PER_BLOCK * 50), std::rand() % (cube::DOTS_PER_BLOCK * 50));
-			xpText.animation_length = 3000;
-			xpText.distance_to_fall = -100;
-			xpText.color = purple;
-			xpText.size = 32;
-			xpText.offset_2d = FloatVector2(-50, -100);
-			xpText.text = std::wstring(L"+") + std::to_wstring(xp_gain) + std::wstring(L" XP");;
-			xpText.field_60 = 0;
-
-			for (int i = 0; i < 4; i++)
-			{
-				m_FXList.push_back(xpText);
-			}
 
-			player->entity_data.XP += xp_gain;
+			// Code taken and modified from: https://github.com/ChrisMiuchiz/Cube-World-Chat-Mod/blob/master/main.cpp
+			// Send a packet instead of just writing to chat, if you are in an online session
+			// An online session shall be defined as whether you're connected to someone else's steam ID, or if your host has more than 1 connection
+			if (cube::SteamUser()->GetSteamID() == game->client.host_steam_id || game->host.connections.size() >= 1) {
+				// Construct a chat packet
+				// Thanks to Andoryuuta for reverse engineering these packets, even before the beta was released
+				BytesIO bytesio;
+
+				bytesio.Write<u32>(0x01); //Packet ID
+				bytesio.Write<u32>(xp_gain / game->host.connections.size()); //Message size
+
+				for (auto& conn : game->host.connections)
+				{
+					cube::SteamNetworking()->SendP2PPacket(conn.first, bytesio.Data(), bytesio.Size(), k_EP2PSendReliable, 2);
+				}
+			}
 		}
 	}