13.016 Introduction to Geometric Modeling and Computation

OpenGL Graphics Library Utility Toolkit (GLUT)

Use of the GLUT library is best illustrated by a short example:

#include <GL/gl.h>                   /* OpenGL library */
#include <GL/glu.h>                  /* OpenGL utility library */
#include "glut.h"                    /* GLUT library */

/**************************************************************
 *  Main program - Open window with initial window size, title
 *  bar, RGBA display mode, and handle input events.
 *************************************************************/

void main(int argc, char **argv)
{
  glutInit(&argc, argv);             /* Initialize GLUT */
  glutInitDisplayMode(GLUT_RGB);     /* Set RGB (not indexed) color mode */

  glutCreateWindow("OpenGL Example 2 - Star");   /* Create window */

  glutReshapeFunc(reshapeCB);        /* Register reshape callback */
  glutDisplayFunc(displayCB);        /* Register display callback */

  glutMainLoop();                    /* Enter the event loop */
}

/***************************************************************
 *  This callback function is automatically called whenever
 *  the window changes shape.
 **************************************************************/

void reshapeCB(int width, int height)
{
  glViewport(0, 0, width, height);    /* set viewport to fill window */
}

/***************************************************************
 *  This callback function is automatically called whenever
 *  the window needs to be redrawn.
 **************************************************************/

void displayCB(void)
{
  ...
}

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