OSX Minimal GLUT

#include <cmath>
#include <vector>
#include <map>
#include <iostream>
#include <OpenGL/gl.h>
#include <GLUT/glut.h>

#define WINFOW_TITLE    "Window Template"
#define WINDOW_WIDTH    400
#define WINDOW_HEIGHT   250
#define UPDATE_TIME     17 /* ((1 / 60) * 1000) rounded up */

void Initialize();
void Shutdown();

void display();
void updateTimer(int windowId);
void reshape(int width, int height);

void glPerspective(float fov, float aspectRatio, float znear, float zfar);

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowPosition(0,0);
    glutInitWindowSize(WINDOW_WIDTH , WINDOW_HEIGHT);
    glutCreateWindow(WINFOW_TITLE);
    reshape(WINDOW_WIDTH, WINDOW_HEIGHT);
    
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutTimerFunc(UPDATE_TIME, updateTimer, glutGetWindow());
    
    Initialize();
    atexit(Shutdown);
    glutMainLoop();
    
    return 0;
}


void Shutdown() {
    
}

void Initialize() {
    
}

void display() {
    glClearColor(0.5f, 0.6f, 0.7f, 0.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    
    
    glutSwapBuffers();
}

void updateTimer(int windowId) {
    
    glutTimerFunc(UPDATE_TIME, updateTimer, windowId);
}

void reshape(int width, int height) {
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glViewport(0, 0, width, height);
    glPerspective(60.0f, width / height, 0.01f, 1000.0f);
    //glOrtho(0.0f, 1.0f, 1.0f, 0.0f, -100.0f, 100.0f);
    glMatrixMode(GL_MODELVIEW);
}

void glPerspective(float fov, float aspectRatio, float znear, float zfar) {
    float ymax = znear * tanf(fov * M_PI / 360.0f);
    float xmax = ymax * aspectRatio;
    
    glFrustum(-xmax, xmax, -ymax, ymax, znear, zfar);
}