/* jcorso::nb - gr_opengl_mip.c.html */

int texname;  /* id for the texture we'll be using 
               * the mipmap still only has one texture name... */

...

  glGenTextures(1,&texname);  /* ask gl to generate a valid texture name (id) */
  glBindTexture(GL_TEXTURE_2D, texname);  /* select the current texture */
  glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL);  /* set the environment */
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);  
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

  /* use the glu call to generate the mipmaps for the texture */
  gluBuild2DMipmaps(GL_TEXTURE_2D,3,width,height,GL_RGB,GL_UNSIGNED_BYTE,tex);

  free(tex);  /* we no longer need this memory lying around */
  glEnable(GL_TEXTURE_2D);  /* tell gl to use the texture */

...