int checkGlew()
{
    GLenum err = glewInit();

    if (err != GLEW_OK) {
        std::cout << "OpenGL/GLEW error while initializing!" << std::endl;
        std::cout << glewGetErrorString(err) << std::endl;
        std::cout << (char*)glGetString( GL_VERSION ) << std::endl;
        std::getchar();
        return 1;
    }


    if (!glewIsSupported("GL_VERSION_2_0")) {
        std::cout << "OpenGL 2.0 found, shaders not supported" << std::endl;
        std::getchar();
        return 1;
    }
}

int main( int argc, char **argv )
{
        glutInit (&argc, argv);
        glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
        glutInitWindowPosition (100, 100);
        glutInitWindowSize (windowWidth, windowHeight);
        glutCreateWindow ("Deferred Shading");

    int err = checkGlew();
    if (err == 1)
        return 0;

    glShadeModel (GL_FLAT); // probably want GL_SMOOTH here unless you like your renders looking like hairy mens asses
    init();

        glutDisplayFunc (display);
        glutReshapeFunc (windowReshape);
        glutSpecialFunc (HandleSpecialKeyboard);

        glutMainLoop ();
}