glutInit(&argc, argv);

    glutInitContextVersion( 3, 0 );

    glutInitDisplayMode (GLUT_DOUBLE|GLUT_RGB);
    glutInitWindowSize (400, 300);
    glutCreateWindow ("Texture test");

    printf("OpenGL vendor (%s): \n",
           glGetString(GL_VENDOR));
    printf("OpenGL renderer (%s): \n",
           glGetString(GL_RENDERER));
    printf("OpenGL version (%s): \n",
           glGetString(GL_VERSION));
    printf("OpenGLSL version (%s): \n",
           glGetString(GL_SHADING_LANGUAGE_VERSION));

    int major = 0;
    glGetIntegerv(GL_MAJOR_VERSION, &major);
    printf("OpenGL major version (%d): \n", major);
 
    int minor = 0;
    glGetIntegerv(GL_MINOR_VERSION, &minor);
    printf("OpenGL minor version (%d): \n", minor);

    int num_glsls = 0;
    glGetIntegerv(GL_NUM_SHADING_LANGUAGE_VERSIONS, &num_glsls); 

    printf("GLSL versions supported by this platform: %d \n", num_glsls);

    for (int i = 0; i < num_glsls; i++) {
       printf("OpenGLSL versions supported by this platform %d (%s): \n", i,
              glGetStringi(GL_SHADING_LANGUAGE_VERSION, i));
    }