#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include "glut.h"
#include "gl.h"

/* ===================================== */
void risi()
{
  glClear(GL_COLOR_BUFFER_BIT);

  glBegin(GL_QUADS);
    glVertex3f( 0.5, 0.5, 0.0);
    glVertex3f(-0.5, 0.5, 0.0);
    glVertex3f(-0.5,-0.5, 0.0);
    glVertex3f( 0.5,-0.5, 0.0);
  glEnd();

  glFlush();
}
/* ===================================== */
int main(int argn, char **argc)
{
  glutInit(&argn, argc);
  glutInitWindowSize(500, 500);
  glutInitDisplayMode(GLUT_SINGLE);
  glutCreateWindow("risi_kvadrat");

  glutDisplayFunc (risi);
  glutMainLoop();

  return 0;
}