Topics

1

General / sf::Text destruction causes segfault

« on: March 22, 2018, 07:09:44 pm »

Hey everyone, I have got a question. Why does this code cause segfault?

#include <SFML/Graphics.hpp>
#include <iostream>

int main()
{
        {
                std::cout << 1 << std::endl;
                sf::Text text;
                std::cout << 2 << std::endl;
                text.setString("Hello world");
                std::cout << 3 << std::endl;
        }
        std::cout << 4 << std::endl;
}
 

After successfully compilation (and run) with this command:

g++-7 -std=c++17 -c main.cpp&&g++-7 main.o -o sfml-app -lsfml-graphics -lsfml-window -lsfml-system&&./sfml-app
It prints me:

1
2
3
Naruszenie ochrony pamięci

Naruszenie ochrony pamięci is Segmentation fault in polish

I use Linux Mint 64bit

2

Graphics / Stack overflow while creating sf::RenderTexture in other thread

« on: June 23, 2017, 04:57:41 pm »

Hey

I try to create sf::RenderTexture object in std::thread method and it causes stack overflow.
My code:

#include <SFML/Graphics.hpp>
#include <thread>

int main()
{
        sf::RenderTexture texture;
        std::thread thread([]() {
                sf::RenderTexture t;
        });

        thread.join();
        return 0;
}
 

Without creating first texture it happens too.

#include <SFML/Graphics.hpp>
#include <thread>

int main()
{
        sf::RenderWindow window(sf::VideoMode(800, 600), "WINDOW");

        while (window.isOpen())
        {
                sf::Event event;
                while (window.pollEvent(event))
                {
                        if (event.type == sf::Event::Closed)
                                window.close();
                        if (event.type == sf::Event::MouseButtonPressed)//crash when button is pressed
                        {
                                std::thread thread([]() {
                                        sf::RenderTexture t;
                                });
                        }
                }
                window.clear(sf::Color(50, 50, 50));
                window.display();
        }
        return 0;
}
 

but it doesn't crash with this code:

#include <SFML/Graphics.hpp>
#include <thread>

int main()
{
        std::thread thread([]() {
                sf::RenderTexture t;
        });
        thread.join();
        return 0;
}

How to solve this problem?

SFML 2.4.2
Microsoft Visual Studio Community 2015, Version 14

3

Graphics / Getting better performance by checking what to draw.

« on: April 25, 2017, 08:14:06 pm »

Hi everyone!
I'm creating a game, not very advanced one, but there will be a lot of drawing object (Sprites etc.). Most of them are going to be out of the player's sight. I will use ordinary function - just window.draw(mySprite) and my question sounds:
Does it takes GPU when I draw sprites (or some other drawable object) which are not visible for player(out of current window's view)?
If yes:
Does SFML (or OpenGL) checks if the sprite can be visible by the player or I should take care of them and check it manually using current window's view and getGlobalBounds method?
And Does it takes GPU when I draw an fully transparent sprite (with color's alpha set to 0)?

4

Network / FTP does not work in release mode.

« on: July 26, 2016, 02:40:39 pm »

Hey all,
I am creating game and i need download additional music file from internet. I tried do it and... I did.
But there is a problem. Program works only in debug mode. When i switch to release and i try download or upload file it crashes. Code:

#include <SFML/Network.hpp>
#include <iostream>

using namespace sf;
using namespace std;

// Normally there are good texts
string login = "";
string password= "";
string adres = "";
int main()
{
    Ftp ftp;
    Ftp::Response odp = ftp.connect(sf::IpAddress(adres.c_str()),21,sf::seconds(3));
    if(odp.isOk())
        cout<<"Connected!"<<endl;
    else
    {
        cout<<"Connecting error!"<<endl;
        getchar();
        return 1;
    }
    odp = ftp.login(login,password);
    if(odp.isOk())
        cout<<"Login succes!"<<endl;
    else
    {
        cout<<"Bad login or password"<<endl;
        cin.get();
        return 1;
    }
    cout<<"Downloading..."<<endl;
    odp = ftp.download("VexentoGlow.ogg","",sf::Ftp::Binary);
    if(odp.isOk())
        cout<<"Download complete!"<<endl;
    else
        cout<<"Error!"<<endl;
    getchar();
    ftp.disconnect();
    return 0;
}
 

It crashes in:
ftp.download("VexentoGlow.ogg","",sf::Ftp::Binary);

In debug mode it works good. It is SFML bug I suppose.
Please help!