class Renderer : public QGLWidget
{
public:
    Renderer();
    
    void addMeshNode(MeshNode *aMeshNode);
    
    void setCamera(Camera *aCamera);

    void initializeGL();
    void resizeGL(int aWidth, int aHeight);
    void paintGL();

private:
    std::vector<MeshNode *> fMeshNodes;
    Camera *fCamera;
    int fWidth;
    int fHeight;
};

void Renderer::initializeGL()
{
    std::cout << this << " Renderer::initializeGL()\n";

    GLenum err = glewInit();
    if (GLEW_OK != err)
    {
        std::cout << "error: glewInit() failed\n";
    }

    glShadeModel(GL_SMOOTH);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}