#include <glut.h>
int height=0;
int width=0;
void mydisplay(){
     glClear(GL_COLOR_BUFFER_BIT); 
	 glColor3f(1.0,0.0,0.0);
	 	// top left: top view
	glViewport(0, height/2, width/2, height/2);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-3.0, 3.0, -3.0, 3.0, 1.0, 50.0);
	gluLookAt(0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//glCallList(object);
	glutSolidTeapot(0.9);

	// top right: right view
	glViewport(width/2, height/2, width/2, height/2);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-3.0, 3.0, -3.0, 3.0, 1.0, 50.0);
	gluLookAt(5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//glCallList(object);
	glutSolidTeapot(0.6);

	// bottom left: front view
	glViewport(0, 0, width/2, height/2);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-3.0, 3.0, -3.0, 3.0, 1.0, 50.0);
	gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//glCallList(object);
	glutSolidTeapot(0.6);

	// bottom right: rotating perspective view
	glViewport(width/2, 0, width/2, height/2);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(70.0, 1.0, 1, 50);
	gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//glRotatef(30.0, 1.0, 0.0, 0.0);
	glPushMatrix();
	glRotatef(40, 0.0, 1.0, 0.0);
	//glCallList(object);
	glutSolidTeapot(1.0);
	glPopMatrix();
	glColor3f(0.0,1.0,0.0);
	glutWireCube(0.5);

	glFlush();
}
void mykey(unsigned char key, int x, int y)
{
if(key=='r')
	{
		int mod=glutGetModifiers();
		if(mod==GLUT_ACTIVE_ALT)
			exit(0);
	}
}
void mykey1(int key, int x, int y)
{
	if(key==GLUT_KEY_F1)
	{
		int mod=glutGetModifiers();
		if(mod==GLUT_ACTIVE_ALT)
			exit(0);
	}
}
void myreshap(int w, int h)
{
	 height=h;
	 width=w;
}

void main(){
	glutInitWindowSize(600,600);
	glutCreateWindow("simple");
	glutDisplayFunc(mydisplay);
	glutKeyboardFunc(mykey);
	glutSpecialFunc(mykey1);
	glutReshapeFunc(myreshap);
		
	glutMainLoop();}