Topics

1

Network / Blocking and locking the UDP receive function

« on: January 28, 2020, 12:00:40 am »

Background: My program has two threads, the UDP receive function and the main game logic thread.

Is it safe to set a UDP socket to blocking and not lock the UDP receive thread when the socket.receive()function is called? I am worried that if I call a socket.send(packet, ip, port)function when the UDP socket is receiving it will interfere with socket. I was worried this is what might have been causing my program to lock up.

2

System / Non-Locked threads and Locked Threads

« on: January 26, 2020, 04:22:36 am »

If a non-locked thread tries to access data inside of a locked thread, will it be blocked from doing so?

3

Network / Should you use one UDP Socket for sending and receiving?

« on: January 17, 2020, 04:52:56 am »

Hello, I have a general question pertaining to SFML's networking. I read in one post that one UDP socket should not be used for both sending and receiving (I might have interpreted this incorrectly: https://en.sfml-dev.org/forums/index.php?topic=22917.0 4th post by Laurent). Is this true, or is it a good idea to stick to using one UDP socket for sending and receiving in SFML's architecture?

4

Network / Using sf::Lock on UDP sockets

« on: January 16, 2020, 04:50:01 am »

Hello, I am working on a tank game and am trying to use both TCP and UDP. So far the TCP is working however I am having difficulties getting UDP to work do to some confusion about mutex. Is it safe to use sf::Lock before calling receive on a blocking UDP socket, or will this stall the program?

                sf::Packet* uPack = new sf::Packet();
                sf::IpAddress rcvAddr;
                short unsigned int rcvPort;
                PacketCont* packCont = new PacketCont();
                sf::Lock lock(sManager->mutex);//this is the line I am worried about
                sf::Socket::Status status = m_UDPSocket.receive(*uPack, rcvAddr, rcvPort);
 

Note: I need the mutex since I am using multiple threads which access the UDP socket class.

5

Network / Selector.wait() not calling after client disconnect

« on: May 26, 2019, 01:46:25 am »

I have been working on a TCP networking game recently and have been having problems with the

 sf::SocketSelector::wait()

function. Whenever a client disconnects the selector basically stops functioning, it will not receive any packets or even trigger after a new client tries to connect. Is this intentional as a part of the SFML engine, or is this most likely a programming error on my part?

6

Graphics / Creating simple 3D objects SFML

« on: April 20, 2019, 06:39:41 am »

For anyone who wants to create simple, rough, and fast 3D models I found a method from Scratch (thanks to kevin11) that works perfectly in SFML. If you separate a 3D object into 2D layers you can stack these layers to create a 3D effects and you can even rotate the objects along the y-axis. This can and will, however, be a bottleneck in your program. If there are any ideas on how to optimize this process they would be very helpful.

7

Network / Shifting sf::Packet into another sf::Packet

« on: April 16, 2019, 05:57:49 pm »

Is there any way to shift a sf::Packet into anoter sf::Packet as seen below(figure1)? I am trying to setup a function that takes a sf::Packet as an arguement, stamps a name on the packet, and then sends it to a client. The problem now is that all that data in the data variable(figure 2) is lost when the data variable is shifted into the newPacket variable.

sf::Packet data;
std::string name = "Bob";
int age;
data << bob <<age;

sf::Packet FinalPacket;
std::string PacketType = "Name";
FinalPacket << PacketType << data;
 

figure 2

bool SFMLNetwork::sendUDP(sf::Packet data, std::string Type, sf::IpAddress receiver, unsigned short rcvPort)
{
        sf::Packet newPacket;
// not sure if data can be shifted into newPacket
        newPacket << Type << data;
        if (UdpSocket.send(newPacket, receiver, rcvPort) == sf::Socket::Status::Done) {
                return true;
        }
        else {
                return false;
        }
}

 

8

Network / Question about: Socket Selectors and UDP

« on: June 07, 2018, 05:14:01 pm »

I'm currently working on an "Soul Knight" esk (top down shooter) game and I decided to use UDP for networking amongst players. The only problem is I don't know exactly how I should receive packets simultaneously from multiple clients on the server. Right now I have a loop going through a list of all the client IP's and client Ports calling receive commands for each client. For each packet I store a copy of it in a std::vector list. Should I continue to use this method for receivin data or use a socketSelector or some other method?