/*
 *  simple.c
 *  This program draws a white rectangle on a black background.
 */


/* E. Angel, Interactive Computer Graphics */

/* A Top-Down Approach with OpenGL, Third Edition */

/* Addison-Wesley Longman, 2003 */



#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>         /* glut.h includes gl.h and glu.h*/
#endif


void display(void)

{
	/* clear window */

	 glClear(GL_COLOR_BUFFER_BIT); 


	/* draw unit square polygon */

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

	/* flush GL buffers */

	glFlush(); 

}


void init()
{

	/* set clear color to black */

	/* 	glClearColor (0.0, 0.0, 0.0, 0.0); */
	/* set fill  color to white */

	/* 	glColor3f(1.0, 1.0, 1.0); */

	/* set up standard orthogonal view with clipping */
	/* box as cube of side 2 centered at origin */
	/* This is default view and these statement could be removed */

	/* glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);  */
}

int main(int argc, char** argv)
{

	/* Initialize mode and open a window in upper left corner of screen */
	/* Window title is name of program (arg[0]) */

	/* You must call glutInit before any other OpenGL/GLUT calls */
	glutInit(&argc,argv); 
	glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);  
	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0); 
	glutCreateWindow("simple"); 
	glutDisplayFunc(display);
	init();
	glutMainLoop();

}