#include "glut.h"

void myDisplay()
{ 
	glClear ( GL_COLOR_BUFFER_BIT );

	glBegin( GL_POLYGON );
	    glVertex2f( -0.5, -0.5 );
	    glVertex2f( -0.5, 0.5 );
	    glVertex2f( 0.5, 0.5 );
	    glVertex2f( 0.5, -0.5 );
	glEnd();

	glFlush();

} // end of myDisplay()


int main ( int argc, char** argv )
{
	glutInit( &argc, argv );
	glutCreateWindow ( "simple demo program" );
	glutDisplayFunc( myDisplay );
	glutMainLoop();

} // end of main()