can anyone explain me the code from here ?

[Sunos]

Hello ,

I got a project downloaded from internet in C++ and i need to explain the code to my teacher .
Can someone give me a explanation please ?

code :

#include <GL/freeglut.h>
#include <stdlib.h>

void initGL(int width, int height)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (GLfloat) width / (GLfloat) height, 2.0f, 100.0f);

glMatrixMode(GL_MODELVIEW);
}

static void display(void)
{
glLoadIdentity();

glPushMatrix();
glTranslatef(0.0, 0.0, -10);
glRotatef(60, 1, 0, 0);
glRotatef(60, 0, 1, 0);
glutSolidCube(2);
glPopMatrix();

glFlush();
}

static void idle(void)
{
glutPostRedisplay();
}

int main(int argc, char *argv[])
{
int width = 640;
int height = 480;

glutInit(&argc, argv);
glutInitWindowSize(width, height);
glutInitWindowPosition(10, 10);
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);

glutCreateWindow("Hello world!");

glutDisplayFunc(display);
glutIdleFunc(idle);

initGL(width, height);

glutMainLoop();

return EXIT_SUCCESS;
}

 

[70i]

Do your own HW. Look up the functions and step go through them. If you don't understand something ask.
https://www.opengl.org/sdk/docs/man/