OpenGL使用glViewport函数时 出现异常

#OpenGL使用glViewport函数时 出现异常。

#include 
#include 
#include 
int main()
{
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    if (window == NULL)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
 
    glfwMakeContextCurrent(window);
    try
    {
        glViewport(0, 0, 80, 60);
    }
    catch ( std::exception& e)
    {
        std::cerr << e.what() << std::endl;
        return -1;
    }
    
    glfwMakeContextCurrent(window);

    getchar();
    return 0;
}

#异常信息
在glViewport(0, 0, 80, 60);发出异常;
0x00000000 处(位于 LearnOpenGL.exe 中)引发的异常: 0xC0000005: 执行位置 0x00000000 时发生访问冲突。

https://blog.csdn.net/tonychan129/article/details/127601869
你没调用gladLoadGLLoader？

这