#include<windows.h>
#include <iostream>
#include <stdlib.h>
#include <GL/glut.h>
using namespace std;

//Initializes 3D rendering
void initRendering() {
//Makes 3D drawing work when something is in front of something else
glEnable(GL_DEPTH_TEST);
}
//Called when the window is resized
void handleResize(int w, int h) {
//Tell OpenGL how to convert from coordinates to pixel values
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION); //Switch to setting the camera perspective
//Set the camera perspective
glLoadIdentity(); //Reset the camera
gluPerspective(45.0,                  //The camera angle
               (double)w / (double)h, //The width-to-height ratio
               1.0,                   //The near z clipping coordinate
               200.0);                //The far z clipping coordinate
}
//Draws the 3D scene
void drawScene() {
//Clear information from last draw
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW); //Switch to the drawing perspective
glLoadIdentity(); //Reset the drawing perspective
glBegin(GL_TRIANGLES); //Begin triangle coordinates
//Triangle
glVertex3f(0.0,40.0,0.0);
glVertex3f(15.0,-20.0,15.0);
glVertex3f(-15.0,-20.0,15.0);
glEnd(); //End triangle coordinates
glBegin(GL_TRIANGLES); //Begin triangle coordinates
//Triangle
glVertex3f(0,40,0);
glVertex3f(-15,-20,-15);
glVertex3f(-15,-20,15);
glEnd(); //End triangle coordinates
glBegin(GL_TRIANGLES); //Begin triangle coordinates
//Triangle
glVertex3f(0.0,40.0,0.0);
glVertex3f(-15.0,-20.0,-15.0);
glVertex3f(15.0,-20.0,-15.0);
glEnd(); //End triangle coordinates

glBegin(GL_TRIANGLES); //Begin triangle coordinates
//Triangle
glVertex3f(0,40,0);
glVertex3f(15,-20,-15);
glVertex3f(15,-20,15);
glEnd(); //End triangle coordinates

glBegin(GL_TRIANGLES); //Begin triangle coordinates
//Triangle
glVertex3f(-15,-20,15);
glVertex3f(-15.0,-20.0,15.0);
glVertex3f(15.0,-20.0,15.0);
glEnd(); //End triangle coordinates
glBegin(GL_TRIANGLES); //Begin triangle coordinates

//Triangle
glVertex3f(15,-20,15);
glVertex3f(-15,-20,-15);
glVertex3f(15,-20,-15);
glEnd(); //End triangle coordinates
glutSwapBuffers(); //Send the 3D scene to the screen
}
int main(int argc, char** argv) {
//Initialize GLUT
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(400, 400); //Set the window size
//Create the window
glutCreateWindow("Basic Shapes");
initRendering(); //Initialize rendering
//Set handler functions for drawing, keypresses, and window resizes
glutDisplayFunc(drawScene);
glutReshapeFunc(handleResize);
glutMainLoop(); //Start the main loop
return 0;
}