Opengl，类内的VAO创建

在main.cpp文件中初始化vao并呈现它们按预期工作。然而，当我移动完全相同的初始化代码到一个单独的类，导致我的制服不被发现(优化出来?)

在main.cpp文件中初始化数组对象时(正常工作):

GLuint createCube(){
    GLuint VBO;
    GLuint VAO;
    GLuint EAO;
    GLfloat vertexData[] = {
        0.5f, -0.5f, -0.5f,
        0.5f, -0.5f, 0.5f,
        -0.5f, -0.5f, 0.5f,
        -0.5f, -0.5f, -0.5f,
        0.5f, 0.5f, -0.5f,
        0.5f, 0.5f, 0.5f,
        -0.5f, 0.5f, 0.5f,
        -0.5f, 0.5f, -0.5f,
    };
    GLuint elementData[] = {
        2-1, 3-1, 4-1,
        8-1, 7-1, 6-1,
        5-1, 6-1, 2-1,
        6-1, 7-1, 3-1,
        3-1, 7-1, 8-1,
        1-1, 4-1, 8-1,
        1-1, 2-1, 4-1,
        5-1, 8-1, 6-1,
        1-1, 5-1, 2-1,
        2-1, 6-1, 3-1,
        4-1, 3-1, 8-1,
        5-1, 1-1, 8-1,
    };
    // make and bind the VAO
    glGenVertexArrays(1, &VAO);
    glBindVertexArray(VAO);
    // make and bind the VBO
    glGenBuffers(1, &VBO);
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    // make and bind the eao
    glGenBuffers(1, &EAO);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EAO);
    //put data into VBO and EAO
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elementData), elementData, GL_STATIC_DRAW);

    // connect the xyz to the "vert" attribute of the vertex shader
    glEnableVertexAttribArray(render.get_shader()->attrib("vert"));
    glVertexAttribPointer(render.get_shader()->attrib("vert"), 3, GL_FLOAT, GL_FALSE, 0, NULL);
    // unbind the VAO, EAO, VBO
    glBindVertexArray(0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    return VAO;

}
int main()
{
    GLuint VAO = createCube();
    glm::mat4 MVP = createMVP();
    bool running = true;
    while(running){
        running = eventHandler();
        render.draw(VAO,36,MVP);
        ui.swapBuffer();
    }
    return 0;
}

在类中初始化数组对象时(在我的着色器中找不到MVP制服，可能优化了吗?)

class cube{
public:
    cube(Render rendrer)
    {
        GLuint VBO;
        GLuint EAO;
        GLfloat vertexData[] = {
            0.5f, -0.5f, -0.5f,
            0.5f, -0.5f, 0.5f,
            -0.5f, -0.5f, 0.5f,
            -0.5f, -0.5f, -0.5f,
            0.5f, 0.5f, -0.5f,
            0.5f, 0.5f, 0.5f,
            -0.5f, 0.5f, 0.5f,
            -0.5f, 0.5f, -0.5f,
        };
        GLuint elementData[] = {
            2-1, 3-1, 4-1,
            8-1, 7-1, 6-1,
            5-1, 6-1, 2-1,
            6-1, 7-1, 3-1,
            3-1, 7-1, 8-1,
            1-1, 4-1, 8-1,
            1-1, 2-1, 4-1,
            5-1, 8-1, 6-1,
            1-1, 5-1, 2-1,
            2-1, 6-1, 3-1,
            4-1, 3-1, 8-1,
            5-1, 1-1, 8-1,
        };
        // make and bind the VAO
        glGenVertexArrays(1, &VAO);
        glBindVertexArray(VAO);
        // make and bind the VBO
        glGenBuffers(1, &VBO);
        glBindBuffer(GL_ARRAY_BUFFER, VBO);
        // make and bind the eao
        glGenBuffers(1, &EAO);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EAO);
        //put data into VBO and EAO
        glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(elementData), elementData, GL_STATIC_DRAW);

        // connect the xyz to the "vert" attribute of the vertex shader
        glEnableVertexAttribArray(rendrer.get_shader()->attrib("vert"));
        glVertexAttribPointer(rendrer.get_shader()->attrib("vert"), 3, GL_FLOAT, GL_FALSE, 0, NULL);
        // unbind the VAO, EAO, VBO
        glBindVertexArray(0);
        glBindBuffer(GL_ARRAY_BUFFER, 0);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    }
    GLuint get_VAO() const
    {
        return VAO;
    }
private:
    GLuint VAO;
};
int main()
{
    cube cube_object(render);
    GLuint VAO = cube_object.get_VAO();
    glm::mat4 MVP = createMVP();
    bool running = true;
    while(running){
        running = eventHandler();
        render.draw(VAO,36,MVP);
        ui.swapBuffer();
    }
    return 0;
}

#version 430
in vec3 vert;
uniform mat4 MVP;
out vec3 vertout;
void main(void)
{
    vertout = vert;
    gl_Position = MVP*vec4(vert, 1.0);
}

#version 430
in vec3 vertout;
out vec4 outcolor;
void main(void)
{
    outcolor = mix(vec4(1,0,0,1),vec4(0,1,0,1),dot(vertout, vertout));
}

在类中创建VAO是否会导致MVP制服被删除，或者是其他东西?

我应该澄清:对象仍然呈现，但它呈现白色和MVP制服缺失。