include iostream include OpenGL gl include OpenGL glu include GLUT glu

#include <iostream>
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h>

GLfloat ctlarray[4][3][4] = {
    {
        { 0.0, 0.0, 0.0, 1.0 },
        { 0.0, 0.0, 0.2, 1.0 },
        { 0.0, 0.0, 0.4, 1.0 }
        
    },
    {
        { 0.2, 1.0, 0.0, 1.0 },
        { 0.2, 1.0, 0.2, 1.0 },
        { 0.2, 1.0, 0.4, 1.0 }
    },
    {
        { 0.4, -1.0, 0.0, 1.0 },
        { 0.4, -1.0, 0.2, 1.0 },
        { 0.4, -1.0, 0.4, 1.0 }
    },
    {
        { 0.6, 0.0, 0.0, 1.0 },
        { 0.6, 0.0, 0.2, 1.0 },
        { 0.6, 0.0, 0.4, 1.0 }
    }
};

GLUnurbsObj* theNurb;

void init() {
    glClearColor(1.0, 1.0, 1.0, 1);
    theNurb = gluNewNurbsRenderer();
    glEnable(GL_DEPTH_TEST);
}


void Display()
{
    GLfloat knot[] = { 0.0, 0.0, 0.0, 1.0, 2.0, 2.0, 2.0 };
    GLfloat knot1[] = { 0.0, 0.0, 0.0, 1.0, 1.0, 1.0 };
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glRotatef(0.1, 1.0, 1.0, 0.5);
    glColor3f(0.3, 0.0, 0.0);
    glEnable(GL_TEXTURE_GEN_S);
    glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
    gluBeginSurface(theNurb);
    gluNurbsSurface(theNurb,
                    7, knot,
                    6, knot1,
                    3 * 4,
                    4,
                    &ctlarray[0][0][0],
                    3, 3,
                    GL_MAP2_VERTEX_4);
    gluEndSurface(theNurb);
    glutPostRedisplay();
    glutSwapBuffers();
}


int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(580, 580);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Test");
    init();
    glutDisplayFunc(Display);
    glutMainLoop();
}