#include "glut.h"
#include <string.h>

int version = 1;

void myDisplay()
{ 
	glClear ( GL_COLOR_BUFFER_BIT );

	if (version != 1) {
	    glColor3f(1.0, 1.0, 1.0);
	}

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

	glColor3f(1.0, 0.0, 0.0);
	glPointSize(4.0);
	glBegin( GL_POINTS );
	    glVertex2f( -0.9, -0.8 );
	    glVertex2f( -0.7, -0.4 );
	    glVertex2f( -0.5, -0.2 );
	    glVertex2f( -0.3, -0.1 );
		glVertex2f( -0.1, 0);
		glVertex2f( 0.0, 0);
		glVertex2f( 0.1, 0);
	    glVertex2f( 0.3, -0.1 );
	    glVertex2f( 0.5, -0.2 );
	    glVertex2f( 0.7, -0.4 );
	    glVertex2f( 0.9, -0.8 );
	glEnd();

	glColor3f(0.0, 1.0, 0.0);
	glBegin( GL_LINE_STRIP );
	    glVertex2f( -0.9, -0.8 );
	    glVertex2f( -0.7, -0.4 );
	    glVertex2f( -0.5, -0.2 );
	    glVertex2f( -0.3, -0.1 );
		glVertex2f( -0.1, 0);
		glVertex2f( 0.0, 0);
		glVertex2f( 0.1, 0);
	    glVertex2f( 0.3, -0.1 );
	    glVertex2f( 0.5, -0.2 );
	    glVertex2f( 0.7, -0.4 );
	    glVertex2f( 0.9, -0.8 );
	glEnd();

    if (version == 3) {
		glClearColor(0.0, 1.0, 0.0, 0.0);
	    glColor3f(1.0, 0.0, 1.0);
		glEnable(GL_LINE_STIPPLE);
		glLineStipple(1, 0x6666);
	    glBegin( GL_LINE_LOOP );
	      glVertex2f( -0.9, -0.8 );
	      glVertex2f( -0.7, -0.4 );
	      glVertex2f( -0.5, -0.2 );
	      glVertex2f( -0.3, -0.1 );
		  glVertex2f( -0.1, 0);
		  glVertex2f( 0.0, 0);
		  glVertex2f( 0.1, 0);
	      glVertex2f( 0.3, -0.1 );
	      glVertex2f( 0.5, -0.2 );
	      glVertex2f( 0.7, -0.4 );
	      glVertex2f( 0.9, -0.8 );
	    glEnd();
	} // end if

	glFlush();

} // end of myDisplay()


void myInit()
{
	glClearColor(0.0, 0.0, 0.0, 1.0);

	glColor3f(1.0, 1.0, 1.0);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(-1.0, 1.0, -1.0, 1.0);

} // end of myInit()

int main ( int argc, char** argv )
{
	if (argc < 2 || strcmp(argv[1], "colorfix"))
		if (argc < 2 || strcmp(argv[1], "loop"))
			version = 1;
		else
			version = 3;
    else
		version = 2;
	glutInit( &argc, argv );
	glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE );
	glutInitWindowSize(500, 500);
	glutInitWindowPosition(0, 200);
	glutCreateWindow ( "simple demo program" );

	/* register callback functions */
	glutDisplayFunc( myDisplay );

	/* set up initial state, and let's go! */
	myInit();
	glutMainLoop();

    return 0;
} // end of main()