SFML在多线程中失败 [英] SFML fails in multithreading

问题描述

我是sfml和c ++的新手，我有一个使用sfml库的项目来绘制图形的项目，但是当我向程序中添加其他线程时，它无法执行该线程内的代码.这是我的代码:(请帮助我！)

  #include< SFML \ Graphics.hpp>#include< SFML \ window.hpp>#include< SFML \ system.hpp>#include< iostream>#include< thread>#include< chrono>使用命名空间std;int h(sf :: RenderWindow * win){//做一点事win-> close();this_thread :: sleep_for(chrono ::毫秒(10));返回0;}int main(){sf :: RenderWindow窗口(sf :: VideoMode(800,600)，我的窗口")；线程t1(h，& window);_sleep(10000000);t1.join();返回0;} 

解决方案

http://www.sfml-dev.org/tutorials/2.0/graphics-draw.php#drawing-from-threads

SFML支持多线程绘图，您甚至不必做任何使它起作用的东西.唯一要记住的是停用在另一个线程中使用它之前的窗口；那是因为有窗户(更确切地说是其OpenGL上下文)不能在多个环境中处于活动状态同时线程.

调用window.setActive(false);在您将main传递给线程之前.

请记住，必须最大程度地移植GUI线程(主线程)中的事件.

im new to sfml and c++.and I have a project that uses the sfml library's to draw the graphics but when I add an additional thread to my program it fails to execute the code inside the thread. this is my code:(please help me!)

#include <SFML\Graphics.hpp>
#include <SFML\window.hpp>
#include <SFML\system.hpp>
#include <iostream>
#include <thread>
#include <chrono>
using namespace std;

int h(sf::RenderWindow* win){
    //do something
    win->close();
    this_thread::sleep_for(chrono::milliseconds(10));
    return 0;
}


int main(){
    sf::RenderWindow window(sf::VideoMode(800,600),"My window");
    thread t1(h,&window);
    _sleep(10000000);
    t1.join();
    return 0;
}

解决方案

http://www.sfml-dev.org/tutorials/2.0/graphics-draw.php#drawing-from-threads

SFML supports multi-threaded drawing, and you don't even have to do anything to make it work. The only thing to remember is to deactivate a window before using it in another thread; that's because a window (more precisely its OpenGL context) cannot be active in multiple threads at the same time.

call window.setActive(false); in your main(), before you pass it off to the thread.

And remember that you must handle events in the GUI thread (the main thread) for maximum portability.

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