尝试在方法中包装glGenVertexArrays时出现分段错误

我试图在Mac OS上使用带有SDL 2.0.3和C++的"现代"OpenGL(3+),如果我直接调用OpenGL函数,它可以工作,但是当我尝试将它包装在类中时它不会工作.更具体地说,我想将Vertex数组对象存储为类成员并glGenVertexArrays在其上调用类方法,但这会导致段错误.

直接调用的最小工作示例(没有任何用处但不会崩溃):

#include 
#include 
#include 

int main()
{
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window *sdlWindow = SDL_CreateWindow(
        "OpenGL Works",
        SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED,
        640,
        480,
        SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI
    );
    SDL_GLContext sdlGLContext = SDL_GL_CreateContext(sdlWindow);

    unsigned int vertexArrayObject;

    // This works
    glGenVertexArrays(1, &vertexArrayObject);

    // Wait some seconds before closing the window
    SDL_Delay(3000);

    SDL_GL_DeleteContext(sdlGLContext);
    SDL_DestroyWindow(sdlWindow);

    return EXIT_SUCCESS;
}

不使用简单类(分段错误):

#include 
#include 
#include 
#include 

class Graphics
{
    public:
        void createVAO();

    private:
        unsigned int vertexArrayObject;
};

void Graphics::createVAO()
{
    glGenVertexArrays(1, &this->vertexArrayObject);
}

int main()
{
    SDL_Init(SDL_INIT_VIDEO);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);

    SDL_Window *sdlWindow = SDL_CreateWindow(
        "OpenGL Shit",
        SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED,
        640,
        480,
        SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI
    );
    SDL_GLContext sdlGLContext = SDL_GL_CreateContext(sdlWindow);

    std::unique_ptr g;

    g->createVAO();

    // Wait some seconds before closing the window
    SDL_Delay(3000);

    SDL_GL_DeleteContext(sdlGLContext);
    SDL_DestroyWindow(sdlWindow);

    return EXIT_SUCCESS;
}

同样的事情发生了glGenBuffers.我想知道它是否只是由于我缺乏c ++技能或者是一个与OpenGL和/或SDL相关的更严重问题而导致的"简单"C++问题.我在Stack Overflow上发现了很多关于类似症状的问题,但是大多数问题是由glewExperimental = GL_TRUE;GLUT或GLEW 缺少的选项造成的,我根本没有使用或者我缺少OpenGL上下文,因为我能够在屏幕:

glGenVertexArrays(1,&vao)的分段错误;

关于glGenVertexArrays调用的程序崩溃

在OpenGL中实现VBO,窗口保持黑色

关于glGenVertexArrays的OpenGL Segfaults

我希望有人能解释为什么这会崩溃,因为我不能:(

我正在使用Mac OS 10.9.3和编译器Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn),这是编译器调用:c++ -o OpenGLTest main.cpp -I /usr/local/include/SDL2 -lSDL2 -framework OpenGL