为什么SFML Shader会导致分段错误？

Question

为什么sf::Shader会导致分段错误。我将显示代码，我会告诉那些看代码的人，我使用了一个引擎，它工作正常，除了使用sf::Shader.And之外，它不会导致崩溃。当我加载着色器时，代码停止。

main.cpp

#include <iostream>
#include "CoreEngine.h"
#include "maingame.h"

int main()
{
//CoreEngine e(new MainGame(new Vector2i(800, 600), "Mama"));
//e.start();
Window::createWindow(800, 600, "Mama");
Window::clearColor(124, 32, 125);

bool running = true;

while(running){
    if(Window::isWindowClosed())
        running = false;


sf::RectangleShape shape(sf::Vector2f(20, 20));
shape.setPosition(10, 10);
sf::Shader shader;
if(!shader.loadFromFile("fragment.fs", sf::Shader::Fragment))
    std::cout << "dfsfsdf";
    Window::clear();
    Window::getDrawer()->draw(shape, &shader);
    Window::render();
}
}

以下是代码的编译版本。

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

int main()
{
//CoreEngine e(new MainGame(new Vector2i(800, 600), "Mama"));
//e.start();
sf::RenderWindow window(sf::VideoMode(800, 600), "Msadama");

sf::Shader shader;
if(!shader.loadFromFile("fragment.fs", sf::Shader::Fragment)){
    std::cerr << "Shader failed to load" << std::endl;
    return 0;
}
sf::RectangleShape shape(sf::Vector2f(20, 20));
shape.setPosition(10, 10);
while(window.isOpen()){
   sf::Event event;

   while(window.pollEvent(event)){
    if(event.type == sf::Event::Closed)
        window.close();
   }




    window.clear();
    window.draw(shape);
    window.display();
}
}

Answer 1

您对sf::Shader::loadFromFile的调用正在失败，这将触发if语句，因为您正在检查错误的条件。你真正想要的是：

sf::Shader shader;
if(!shader.loadFromFile("fragment.fs", sf::Shader::Fragment))
    std::cerr << "Shader failed to load" << std::endl; 
    return 0;
}

std::cout << "dfsfsdf";
Window::clear();
Window::getDrawer()->draw(shape, &shader);
Window::render();

无论如何，您不应该在每一帧都从文件加载着色器。做一次，检查错误，然后进入主循环。类似于以下内容(未经测试)：

int main()
{
    Window::createWindow(800, 600, "Mama");
    Window::clearColor(124, 32, 125);

    sf::Shader shader;
    if(!shader.loadFromFile("fragment.fs", sf::Shader::Fragment))
    {
        std::cerr << "Failed to load shader" << std::endl;
        return 0;
    }

    bool running = true;

    while(running){
        if(Window::isWindowClosed())
            running = false;

        sf::RectangleShape shape(sf::Vector2f(20, 20));
        shape.setPosition(10, 10);

        Window::clear();
        Window::getDrawer()->draw(shape, &shader);
        Window::render();
    }
}