c++ - 本地主机上的 SFML UDP 滞后

void createUdpServer(unsigned short port) { // send data to client // Create a socket to receive a message from anyone sf::UdpSocket socket; sf::IpAddress local = sf::IpAddress::getLocalAddress(); // Currently 127.0.0.1 localhost sf::IpAddress receiver = sf::IpAddress::getLocalAddress(); socket.setBlocking(false); // I was figuring out and arranging according to example.. set socket non blocking // Listen to messages on the specified port if (socket.bind(port) != sf::Socket::Done && !portBound) // You bind once return; // error else { portBound = true; } std::cout << "Server is listening to port " << port << ", waiting for a connection... " << std::endl; // Wait for a message char in[128]; std::size_t received; sf::IpAddress sender; //unsigned short senderPort; we will be receiving and sending data on sa,e port sf::SocketSelector selector; selector.add(socket); if (selector.wait(sf::milliseconds(10.f))) { // times out after 10ms if (selector.isReady(socket)) { if (socket.receive(in, sizeof(in), received, sender, port) != sf::Socket::Done) // blocking return; std::cout << "Message received from client " << sender << ": \"" << in << "\"" << std::endl; } } // Sends connection established to client /* const char out[] = "Connection with server established!"; if (socket.send(out, sizeof(out), sender, port) != sf::Socket::Done) return; */ // acknowledgement of packets float playerXPosition = player->getPosition().x; float playerYPosition = player->getPosition().y; sf::Packet playerData; sf::Packet bulletData; playerData << playerXPosition << playerYPosition << bulletPtr->isAlive() << bulletPtr->getLocation().x << bulletPtr->getLocation().y; //bulletData << bulletPtr->isAlive() << bulletPtr->getLocation().x << bulletPtr->getLocation().y; socket.send(playerData, sender, port); //socket.send(bulletData, sender, port); //const char out[] = ""; //if (socket.send(out, sizeof(out), sender, port) != sf::Socket::Done) // return; } void runUdpClient(unsigned short port) { // receive data from server // Ask for the server address server = "127.0.0.1"; /* if (server == sf::IpAddress::None) do { std::cout << "Type the address or name of the server to connect to: "; std::cin >> server; } while (server != sf::IpAddress::None); */ // Create a socket for communicating with the server sf::UdpSocket socket; sf::IpAddress recipient = sf::IpAddress::getLocalAddress(); char data[100] = "Connection with client established!"; if (socket.send(data, 100, server, port) != sf::Socket::Done && !sendInitialToServer) // if send once dont't send again { // added up top send this only once // error... } else{ sendInitialToServer = true; } // Think about putting this globally sf::SocketSelector selector; selector.add(socket); if (selector.wait(sf::milliseconds(10.f))) { // not enough time for server to be created with 0.1f // received something if (selector.isReady(socket)) { // Wait for a message char in[128]; std::size_t received; // am I using this? sf::IpAddress sender; sf::Packet playerData; sf::Packet bulletData; float playerXPosition; float playerYPosition; float clientXPosition; float clientYPosition; float clientBulletX; float clientBulletY; bool bulletShot; socket.receive(playerData, sender, port); //socket.receive(bulletData, sender, port); if (playerData >> playerXPosition >> playerYPosition >> bulletShot >> clientBulletX >> clientBulletY) { // if you are able to read clientXPosition = playerXPosition; clientYPosition = playerYPosition; player->setPosition(clientXPosition, clientYPosition); if (bulletShot) { // - might not need this bulletPtr->spawn(true); // once bullet spawned, should be taken care of both sides if (bulletPtr->isAlive()) bulletPtr->setLocation(clientXPosition - 13.f, clientYPosition - 24.f); //else // clientbulletx and clientbullety //bulletPtr->draw(window); // client window handled from both client and server what to do if bullet is alive } } /* if (bulletData >> bulletShot >> clientBulletX >> clientBulletY) { if (bulletShot) { bulletPtr->spawn(true); // once bullet spawned, should be taken care of both sides bulletPtr->setLocation(player->getPosition().x - 13.f, player->getPosition().y - 24.f); //bulletPtr->draw(window); // client window handled from both client and server what to do if bullet is alive } }*/ else { // Handle error / packet loss // else simulate? std::cout << "Error - failed to read from player data packet!" << std::endl; // this is normal when packet is lost // I think I am getting several packet drops as I am receiving and sending from the same PC same port, localhost } //unsigned short senderPort; //if (socket.receive(in, sizeof(in), received, sender, port) != sf::Socket::Done) // return; //std::cout << "Message received from server " << sender << ": \"" << in << "\"" << std::endl; } // this shouldn't be here, receive stuff should go on client, server just sends } else { // timeout reached, nothing was received } // prediction // bullet }

while (window.isOpen()) { if (userChoice == NULL){ do { std::cout << "User Choice - " << userChoice << std::endl; std::cout << "Server or client? (s/c)" << std::endl; std::cin >> userChoice; } while (userChoice != 's' && userChoice != 'c'); // The game clock will keep on restarting until the user makes a decision clock.restart(); // This solved issue to start movements and updates at same time once user chooses an option } if (userChoice == 's' || userChoice == 'c') { // start of main if // else start the whole program // game time over here once game starts // frame independent // Binding of ports for both client or server /* // bind the socket to a port if (socket.bind(54000) != sf::Socket::Done) { // Using UDP starts listening on this port // whatever happens, bind for both -> will work with two executables running on same network with two different local IPs } */ // Puts the time counter back to zero and also returns the time elapsed since the clock was started sf::Time deltaTime = clock.restart(); timeSinceLastUpdate += deltaTime; while (timeSinceLastUpdate > TimePerFrame) // fixed time steps // userchoice != NULL otherwise it will start immeadiately { timeSinceLastUpdate -= TimePerFrame; // solves problem with variable delta time, each frame is unique processEvents(window); //update(TimePerFrame); // Start of if server if (userChoice == 's'){ //if(!serverCreated){ // if problems of continous connection, this needs to place outside of bind // create connection createUdpServer(SERVER_PORT); // over here its happening every frame //serverCreated = true; // is server actually created though? //} // Player 1 movement sf::Vector2f movement(0.f, 0.f); if (mIsMovingUp) movement.y -= playerSpeed; if (mIsMovingDown) movement.y += playerSpeed; if (mIsMovingLeft) movement.x -= playerSpeed; if (mIsMovingRight) movement.x += playerSpeed; // shooting logic if (mIsShooting) { if (!bullet.isAlive()) // && !gameOver { bullet.spawn(true); bullet.setLocation(mPlayer.getPosition().x - 13.f, mPlayer.getPosition().y - 24.f); // mPlayer.getPosition().x + 24 (offset) if origin is not set to center } } // ** These two parts need to be put in an if statement, if server, direct movement, if client, move needs to happen with data received // from server (Server - main player streamer; Client - viewer) // Possibly this will be the data that needs to be sent to server mPlayer.move(movement * TimePerFrame.asSeconds()); // Time.deltaTime frame independent movement // for each player eventually screenBound(mPlayer); // screenbound enemies or else check that they do not go off bounds and change direction // ** } // end of if server else { // Handle control through incoming network data // vector x = datacoming in // Hypothetically mPlayer.move(data coming in); // bullet spawn // setlocation from data packet runUdpClient(SERVER_PORT); } // Enemy Behaviour // Ideally move to separate method sf::Vector2f enemyMovement(1.f, 0.f); float yOffset = 30.f; float xOffset = 60.f; // Be careful with iterators as when deleting it will automatically jump to the next item in vector for (std::vector<Enemy>::iterator i = enemyList->begin(); i != enemyList->end(); ++i) // CAUTION & solved everything again - lesson in C++, if we don't get address, we always create a copy and modify it, which is not what we want { //std::cout << "Direction before working move " << direction << std::endl; i->getSprite().move(enemyMovement * direction); // Issue detected direction only changing sign if greater or less than screen bounds once if (i->getSprite().getPosition().x + i->getSprite().getLocalBounds().width / 2 > game->getWindowWidth() || i->getSprite().getPosition().x - i->getSprite().getLocalBounds().width / 2 < game->getWindowWidth() - game->getWindowWidth()) { // this will be 0 direction = -(direction); // Time stamp over here for network calculations //std::cout << "Direction inside if statement " << direction << std::endl; // another for loop move all down by yOffset for (std::vector<Enemy>::iterator i = enemyList->begin(); i != enemyList->end(); ++i) { i->getSprite().setPosition(i->getSprite().getPosition().x, i->getSprite().getPosition().y + yOffset); //enemy.move(0.f, enemy.getPosition().y + yOffset); } //enemy.setPosition(enemy.getPosition().x, enemy.getPosition().y + yOffset); // y axis is inverted in SFML //return 0; // move to separate method } // This takes care of everything on both sides if ((i->getSprite().getPosition().y > game->getWindowHeight() - mPlayer.getLocalBounds().height)) { //removeEnemy(enemy); // ALIVE is false, then draw based on whether alien is alive or not std::cout << "Everyone should be dead game over!" << std::endl; return 0; // change state to paused } } } updateStatistics(deltaTime, mStatisticsText); // ** Start of if server if (userChoice == 's'){ for (std::vector<Enemy>::iterator i = enemyList->begin(); i != enemyList->end(); ++i) { // Test player and alien collision if (CollisionManager::collidesWith(mPlayer, *i) && i->isAlive()) { // *i it points to the enemy, and will give me an enemy std::cout << "You're dead!" << std::endl; mPlayerIsAlive = false; return 0; //-> I'm dead gameOver = true; } // Test collision between bullets and aliens if (CollisionManager::collidesWith(bullet, *i) && i->isAlive()) { i->kill(); //enemyList->erase(i); // issue here, we are trying to do this in order to get rid of rendering problems .. shit just move it out of way //i->setLocation(700.f, 10.f); bullet.kill(); bullet.setLocation(700.f, 0.f); // temporary solution for dealing with not actually killing but stop drawing bullet // without above line, the bullet will not be drawn but still exist on screen } /* v.erase(std::remove_if(v.begin(), v.end(), //erase returns it, so it = erase [](int i) { return i < 10; }), v.end()); */ } } // ** end of if server int deadEnemies = 0; for (std::vector<Enemy>::iterator i = enemyList->begin(); i != enemyList->end(); ++i) { if (!(i->isAlive())) { deadEnemies++; } if (deadEnemies >= NUMBER_OF_ALIENS) { std::cout << "You win!" << std::endl; return 0; // Set state win } } //std::cout << "Total Dead Enemies - " << deadEnemies << std::endl; //for (Enemy& enemy : enemyList) { // if (enemy.isAlive()) { // enemy.draw(window); // } //} //enemy.render(alienArray, mWindow); /* for (int i = 0; i < mEnemies.size(); i++) { sf::Sprite temp = mEnemies.at(i); mWindow.draw(temp); } */ // Render All // Remember draw order is important window.clear(); window.draw(mBackground); window.draw(mPlayer); window.draw(mStatisticsText); for (std::vector<Enemy>::iterator i = enemyList->begin(); i != enemyList->end(); ++i) { if (i->isAlive()) { i->draw(window); //std::cout << "Enemy " << i->getID() << " position - " << i->getLocation().x << " " << i->getLocation().y << std::endl; } } if (bullet.isAlive()) // && !gameOver // for game state and win / lose screen representation { //draw bullet bullet.draw(window); //move bullet bullet.getSprite().move(0.f, -20); } //test collision with bullet and boundary if (bullet.getSprite().getPosition().y < 0) bullet.kill(); window.display(); } // end of main second if } return 0; }