#include <stdio.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

static int width;
static int height;
GLfloat zSpin;

void init()
{
    glClearColor(0, 0, 0, 0);
    glEnable(GL_DEPTH_TEST);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-3, 3, -3, 3, 1, 50);
    glLoadIdentity();
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);


    glViewport(0, height / 2, width / 2, height / 2);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-3, 3, -3, 3, 1, 50);
    glLoadIdentity();
    glColor3f(1.0f, 0, 0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0.0f, -0.5f, 0.0f,
              0.0f, 0.0f, 0.0f,
              0.0f, 0.0f, 1.0f);
    glutWireTeapot(0.5f);

    glViewport(width / 2, height / 2, width / 2, height / 2);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-3, 3, -3, 3, 1, 50);
    glLoadIdentity();
    glColor3f(1.0f, 0, 0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(1.0f, 0.0f, 0.0f,
              0.0f, 0.0f, 0.0f,
              0.0f, 1.0f, 0.0f);
    glutWireTeapot(0.5f);

    glViewport(0, 0, width / 2, height / 2);
    glMatrixMode(GL_PROJECTION);
    glOrtho(-3, 3, -3, 3, 1, 50);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glColor3f(1.0f, 0, 0);
    glutWireTeapot(0.5f);

    glViewport(width / 2, 0, width / 2, height / 2);
    //glMatrixMode(GL_PROJECTION);
    gluPerspective(70, 1, 1, 50);
    glLoadIdentity();
    //glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glRotatef(zSpin, 0, 0, 1.0);
    glRotatef(45, 1, 0, 0);
    glColor3f(1.0f, 0, 0);
    glutWireTeapot(0.5f);

    glFlush();
}
void reshape(int w, int h)
{
    width = w;
    height = h;
    glViewport(0, 0, width, height);
}
void rotationFunc(void){
    zSpin +=0.3;
    display();
}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    int screen_Width = (glutGet(GLUT_SCREEN_WIDTH) - 640) / 2;
    int screen_Height = (glutGet(GLUT_SCREEN_HEIGHT) - 480) / 2;
    glutInitWindowPosition(screen_Width, screen_Height);
    glutInitWindowSize(800, 800);
    glutCreateWindow("Bonus 2");

    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutIdleFunc(rotationFunc);
    glutMainLoop();
    return 0;
}