float amb_comp[] = { 0.1 , 0.1 ,0.1, 1.0 };
    float dif_comp[] = { 1.0 , 1.0, 1.0, 1.0 };
    float spec_comp[] = { 1.0, 1.0 ,1.0 ,1.0 };
    float light_pos[] = { 1.0, 1.0, 0.0, 0.0};

    glLightfv(GL_LIGHT0, GL_AMBIENT, amb_comp);
    glLightfv(GL_LIGHT0, GL_SPECULAR, spec_comp);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, dif_comp);
    glLightfv(GL_LIGHT0, GL_POSITION, light_pos);

    glEnable(GL_LIGHT0);