public static void main(String[] args) {
    if (!glfwInit()) {
        throw new IllegalStateException("Unable to initialize GLFW");
    }

    glfwDefaultWindowHints();

    long window = glfwCreateWindow(640, 480, "My LWJGL Program", 0, 0);

    if (window == NULL) {
        throw new RuntimeException("Failed to create the GLFW window");
    }

    glfwShowWindow(window);

    glfwMakeContextCurrent(window);//上下文
    GL.createCapabilities();//createCapabilities

    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
    }
}

while (!glfwWindowShouldClose(window)) {
    glfwPollEvents();
            
    glClear(GL_COLOR_BUFFER_BIT);//清除缓冲区

    glBegin(GL_QUADS);//绘制的形状(矩形)

    glColor4f(1, 0, 0, 0);//颜色
    glVertex2d(-0.5f, 0.5f);//第一个点
    glVertex2d(0.5f, 0.5f);//第二个点
    glVertex2d(0.5f, -0.5f);//第三个点
    glVertex2d(-0.5f, -0.5f);//第四个点

    glEnd();//结束

    glfwSwapBuffers(window);//交换缓冲区 
}