CQTSOG Development In C - CreoDAMO/CQTSOG-MMORPG GitHub Wiki

This comprehensive build guide will walk you through developing the CryptoQuest MMORPG, focusing on integrating multiplayer game functionality, advanced smart contract interactions, and transitioning the front-end to C++ for a seamless and highly optimized experience.

1. Open your Unreal Engine project.
2. Enable the Online Subsystem:
   • Navigate to Edit -> Plugins.
   • In the Plugins window, search for "Online Subsystem" and enable it if it's not already enabled. Restart the editor if prompted.

1. Create a C++ Class for GameSessionManager:

   • Go to File -> New C++ Class.
   • Select Actor as the parent class and name it GameSessionManager.

2. Add Necessary Components and Functions:

   • Open GameSessionManager.h and add the following components and functions:

     #pragma once
     
     #include "CoreMinimal.h"
     #include "GameFramework/Actor.h"
     #include "GameSessionManager.generated.h"
     
     UCLASS()
     class YOURGAME_API AGameSessionManager : public AActor
     {
         GENERATED_BODY()
     
     public:
         AGameSessionManager();
     
         UFUNCTION(BlueprintCallable, Category = "Session")
         void StartNewSession();
     
         UFUNCTION(BlueprintCallable, Category = "Session")
         void FindSessions();
     
         UFUNCTION(BlueprintCallable, Category = "Session")
         void JoinSession();
     
     protected:
         virtual void BeginPlay() override;
     };

3. Implement Session Management Logic:

   • Open GameSessionManager.cpp and implement the session management functions:

     #include "GameSessionManager.h"
     #include "OnlineSubsystem.h"
     #include "OnlineSessionSettings.h"
     
     AGameSessionManager::AGameSessionManager()
     {
         PrimaryActorTick.bCanEverTick = true;
     }
     
     void AGameSessionManager::BeginPlay()
     {
         Super::BeginPlay();
     }
     
     void AGameSessionManager::StartNewSession()
     {
         IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();
         if (OnlineSubsystem)
         {
             IOnlineSessionPtr Sessions = OnlineSubsystem->GetSessionInterface();
             if (Sessions.IsValid())
             {
                 FOnlineSessionSettings SessionSettings;
                 SessionSettings.bIsLANMatch = true;
                 SessionSettings.NumPublicConnections = 4;
                 SessionSettings.bShouldAdvertise = true;
                 Sessions->CreateSession(0, NAME_GameSession, SessionSettings);
             }
         }
     }
     
     void AGameSessionManager::FindSessions()
     {
         IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();
         if (OnlineSubsystem)
         {
             IOnlineSessionPtr Sessions = OnlineSubsystem->GetSessionInterface();
             if (Sessions.IsValid())
             {
                 FOnlineSessionSearchPtr SearchSettings = MakeShareable(new FOnlineSessionSearch());
                 SearchSettings->bIsLanQuery = true;
                 Sessions->FindSessions(0, SearchSettings.ToSharedRef());
             }
         }
     }
     
     void AGameSessionManager::JoinSession()
     {
         IOnlineSubsystem* OnlineSubsystem = IOnlineSubsystem::Get();
         if (OnlineSubsystem)
         {
             IOnlineSessionPtr Sessions = OnlineSubsystem->GetSessionInterface();
             if (Sessions.IsValid())
             {
                 FOnlineSessionSearchResult SearchResult;
                 Sessions->JoinSession(0, NAME_GameSession, SearchResult);
             }
         }
     }

1. Create a MultiplayerGameManager C++ Class:

   • Create another C++ class named MultiplayerGameManager, derived from AActor.

2. Add Components and Functions:

   • In MultiplayerGameManager.h:

     #pragma once
     
     #include "CoreMinimal.h"
     #include "GameFramework/Actor.h"
     #include "MultiplayerGameManager.generated.h"
     
     UCLASS()
     class YOURGAME_API AMultiplayerGameManager : public AActor
     {
         GENERATED_BODY()
     
     public:
         AMultiplayerGameManager();
     
     protected:
         virtual void BeginPlay() override;
     };

3. Implement Multiplayer Logic:

   • In MultiplayerGameManager.cpp:

     #include "MultiplayerGameManager.h"
     
     AMultiplayerGameManager::AMultiplayerGameManager()
     {
         PrimaryActorTick.bCanEverTick = true;
     }
     
     void AMultiplayerGameManager::BeginPlay()
     {
         Super::BeginPlay();
     }

1. Add a Reference to MultiplayerGameManager in GameSessionManager:

   • Update GameSessionManager.h to include a reference to MultiplayerGameManager:

     private:
         AMultiplayerGameManager* MultiplayerManager;

2. Initialize MultiplayerManager in GameSessionManager.cpp:

   • In BeginPlay:

     MultiplayerManager = GetWorld()->SpawnActor<AMultiplayerGameManager>(AMultiplayerGameManager::StaticClass());

1. Compile and Launch the Project:

   • Compile your project and launch it in standalone or dedicated server mode.

2. Test Multiplayer Functionality:

   • Test the multiplayer functionality by joining sessions from multiple instances of the game. Monitor logs and debug any issues.

1. Create a C++ class to handle interactions with smart contracts:

   • Create SmartContractInterface.h:

     #include <web3cpp.h>
     
     class SmartContractInterface {
     public:
         SmartContractInterface(const std::string& provider, const std::string& contractAddress, const std::string& abi);
         std::string callMethod(const std::string& method, const Json::Value& params);
     private:
         Web3Client client;
         Contract contract;
     };

   • Create SmartContractInterface.cpp:

     #include "SmartContractInterface.h"
     
     SmartContractInterface::SmartContractInterface(const std::string& provider, const std::string& contractAddress, const std::string& abi)
         : client(provider), contract(client.loadContract(abi, contractAddress)) {}
     
     std::string SmartContractInterface::callMethod(const std::string& method, const Json::Value& params) {
         return contract.call(method, params);
     }

1. Use Qt for the frontend:

   • Create MainWindow.h:

     #include <QWidget>
     #include "SmartContractInterface.h"
     
     class MainWindow : public QWidget {
         Q_OBJECT
     
     public:
         MainWindow(QWidget *parent = 0);
     
     private:
         SmartContractInterface contractInterface;
     };

   • Create MainWindow.cpp:

     #include "MainWindow.h"
     
     MainWindow::MainWindow(QWidget *parent)
         : QWidget(parent), contractInterface("http://localhost:8545", "0xYourContractAddress", "YourContractABI") {
         // Setup UI and connect signals to contract methods
     }

   • Create main.cpp:

     #include <QApplication>
     #include "MainWindow.h"
     
     int main(int argc, char *argv[]) {
         QApplication app(argc, argv);
         MainWindow window;
         window.show();
         return app.exec();
     }

2. Build and Run the Application:

   qmake && make
   ./CryptoQuestMMORPG

1. Extend SmartContractInterface to handle multiple contracts:

   • Create SmartContractManager.h:

     #include <map>
     #include <web3cpp.h>
     
     class SmartContractManager {
     public:
         SmartContractManager(const std::string& provider);
         void addContract(const std::string& name, const std::string& address, const std::string& abi);
         std::string callMethod(const std::string& name, const std::string& method, const Json::Value& params);
     private:
         Web3Client client;
         std::map<std::string, Contract> contracts;
     };

   • Create SmartContractManager.cpp:

     #include "SmartContractManager.h"
     
     SmartContractManager::SmartContractManager(const std::string& provider) : client(provider) {}
     
     void SmartContractManager::addContract(const std::string& name, const std::string& address, const std::string& abi) {
         contracts[name] = client.loadContract(abi, address);
     }
     
     std::string SmartContractManager::callMethod(const std::string& name, const std::string& method, const Json::Value& params) {
         return contracts[name].call(method, params);
     }

2. Integrate SmartContractManager with the frontend:

   • Update MainWindow.h:

     #include <QWidget>
     #include "Smart
     

ContractManager.h"

 class MainWindow : public QWidget {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

 private:
     SmartContractManager contractManager;
 };
 ```

• Update MainWindow.cpp:

  #include "MainWindow.h"
  
  MainWindow::MainWindow(QWidget *parent)
      : QWidget(parent), contractManager("http://localhost:8545") {
      contractManager.addContract("Token", "0xTokenContractAddress", "TokenContractABI");
      contractManager.addContract("GameLogic", "0xGameLogicContractAddress", "GameLogicContractABI");
      // Setup UI and connect signals to contract methods
  }

1. Create a Backup:

   cp -r /path-to-your-project /path-to-your-project-backup

2. Check Dependencies:

   • Make a list of dependencies used in the current React+Vite project.
   • Identify the functionalities you need to replicate or retain in the C++ version.

1. Remove React and Vite Specific Files:

   rm -rf src public node_modules package.json vite.config.js

2. Uninstall Node.js and NPM (if no longer needed):

   sudo apt-get remove --purge nodejs npm

1. Install Necessary C++ Dependencies:

   • Install Qt if you're using it for the UI:

     sudo apt-get install qt5-default

2. Create a New C++ Project Structure:

   • Create directories for your new C++ project:

     mkdir -p /path-to-your-project/src /path-to-your-project/include

3. Create C++ Source Files:

   • Set up your main application file, UI components, and smart contract interface classes as described previously.

1. Check Backend Compatibility:

   • Ensure that your existing backend (if it interacts with the front-end) is compatible with the new C++ front-end.

2. Adjust Backend Endpoints:

   • Modify backend endpoints if needed to align with the new front-end requests.

1. Write the C++ Code:

   • Implement the UI and smart contract interactions as outlined in the earlier steps.

2. Compile and Run:

   • Use qmake or cmake to compile the project:

     qmake && make
     ./YourAppName

3. Test Thoroughly:

   • Ensure all functionalities from the previous React+Vite setup are available and working in the new C++ front-end.

1. Polkadot and Cosmos for Interoperability:

   • Polkadot: Use the Substrate framework to build a parachain that connects to the Polkadot relay chain.

     use substrate_node_template_runtime::{opaque::Block, RuntimeApi};
     use sc_service::{Configuration, error::Error as ServiceError};
     use sc_consensus_aura::sr25519::AuthorityPair as AuraPair;
     
     fn new_full_base(config: Configuration) -> Result<TaskManager, ServiceError> {
         // Initialization code for a Substrate-based parachain
     }

   • Cosmos: Implement the Inter-Blockchain Communication (IBC) protocol to enable asset transfers across Cosmos SDK-based blockchains.

     import (
         "github.com/cosmos/cosmos-sdk/baseapp"
         "github.com/cosmos/cosmos-sdk/x/bank"
         "github.com/cosmos/cosmos-sdk/x/ibc"
     )
     
     func NewApp(...) *App {
         // Setup IBC and bank modules
     }

1. Immutable X for Eco-Friendly NFTs:
   • Utilize Immutable X’s Layer 2 scaling solution for NFT minting and transfers.

     import { ImmutableXClient } from '@imtbl/imx-sdk';
     
     const client = new ImmutableXClient('YOUR_API_KEY');
     
     async function mintNFT() {
         const mintResponse = await client.mint({
             tokenAddress: '0xYourNFTContractAddress',
             user: '0xUserAddress',
             metadata: { ... }
         });
         console.log(mintResponse);
     }

1. Example:

   // Model
   class DataModel : public QObject {
       Q_OBJECT
       Q_PROPERTY(QString data READ data WRITE setData NOTIFY dataChanged)
   
   public:
       QString data() const { return m_data; }
       void setData(const QString &data) { 
           if (data != m_data) {
               m_data = data;
               emit dataChanged();
           }
       }
   
   signals:
       void dataChanged();
   
   private:
       QString m_data;
   };
   
   // ViewModel
   class ViewModel : public QObject {
       Q_OBJECT
   
   public:
       ViewModel(DataModel *model, QObject *parent = nullptr) : QObject(parent), m_model(model) {
           connect(m_model, &DataModel::dataChanged, this, &ViewModel::onDataChanged);
       }
   
   private slots:
       void onDataChanged() {
           // Handle data changes
       }
   
   private:
       DataModel *m_model;
   };

1. Dockerfile:

   FROM ubuntu:20.04
   
   RUN apt-get update && apt-get install -y \
       build-essential \
       qt5-default \
       && rm -rf /var/lib/apt/lists/*
   
   WORKDIR /app
   COPY . /app
   
   RUN qmake && make
   
   CMD ["./YourAppName"]

2. Build and Run:

   docker build -t cryptoquest-app .
   docker run -it --rm cryptoquest-app

1. Example with EnTT:

   #include <entt/entt.hpp>
   
   struct Position { float x, y; };
   struct Velocity { float dx, dy; };
   
   entt::registry registry;
   auto entity = registry.create();
   registry.emplace<Position>(entity, 0.f, 0.f);
   registry.emplace<Velocity>(entity, 1.f, 1.f);
   
   auto view = registry.view<Position, Velocity>();
   view.each([](auto &pos, auto &vel) {
       pos.x += vel.dx;
       pos.y += vel.dy;
   });

1. State Synchronization:

   pragma solidity ^0.8.0;
   
   contract GameState {
       mapping(address => uint256) public playerScores;
   
       function updateScore(address player, uint256 score) public {
           playerScores[player] = score;
       }
   
       function getScore(address player) public view returns (uint256) {
           return playerScores[player];
       }
   }

1. Using QML for Responsive Design:

   GridLayout {
       columns: 2
       RowLayout {
           Label { text: "Name" }
           TextField { id: nameField }
       }
       RowLayout {
           Label { text: "Age" }
           TextField { id: ageField }
       }
   }

1. WalletConnect Integration:

   import WalletConnectProvider from "@walletconnect/web3-provider";
   
   const provider = new WalletConnectProvider({
       infuraId: "YOUR_INFURA_ID",
   });
   
   await provider.enable();

1. WebGPU/Canvas2D for Graphics:

   // Implement WebGPU/Canvas2D in C++ (details will depend on specific requirements and libraries used)

1. Modding API:

   // Define hooks in your game logic
   class GameModding {
   public:
       virtual void onPlayerJoin(Player &player) = 0;
       virtual void onGameStart() = 0;
   };
   
   // Allow mods to register with the game engine
   std::vector<GameModding*> mods;
   void registerMod(GameModding* mod) {
       mods.push_back(mod);
   }

1. Integrating ReplayKit:

   // Objective-C/Swift example for iOS ReplayKit
   import ReplayKit
   
   class GameViewController: UIViewController, RPScreenRecorderDelegate {
       func startRecording() {
           let recorder = RPScreenRecorder.shared()
           recorder.delegate = self
           recorder.startRecording { (error) in
               if let error = error {
                   print("Error starting recording: \(error.localizedDescription)")
               }
           }
       }
   }

By following this comprehensive build guide, integrating advanced features and patterns, and incorporating enhancements, you

can develop a highly optimized, scalable, and future-proof blockchain-based MMORPG experience for CryptoQuest. This guide ensures the game remains at the forefront of innovation, attracting both players and investors alike.