用SFML和OpenGL显示白色三角形？

#include <SFML/Graphics.hpp>

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

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

        window.clear();
        // 在这里绘制三角形
        window.display();
    }

    return 0;
}

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

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

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

        window.clear();

        // 使用OpenGL绘制白色三角形
        glBegin(GL_TRIANGLES);
        glColor3f(1.0f, 1.0f, 1.0f);  // 设置颜色为白色
        glVertex2f(0.0f, 0.5f);       // 设置顶点1
        glVertex2f(-0.5f, -0.5f);     // 设置顶点2
        glVertex2f(0.5f, -0.5f);      // 设置顶点3
        glEnd();

        window.display();
    }

    return 0;
}