Template Allegro 5 Ready to code

//*******************************************************************************
// main.cpp *********************************************************************
//*******************************************************************************
//------------------------------------------------------------------------------ ALLEGRO 5 template
// By Silver TES 2016
//------------------------------------------------------------------------------
#include "TemplateAllegro5.h"
//------------------------------------------------------------------------------ Init
int init()
{
    initWindow(640,360,2);
    //--- INIT ALL HERE !

    return log(0,"- init OK !\n");
}

//------------------------------------------------------------------------------ Done
int done()
{
    //--- DONE ALL HERE !

    return log(0,"- done OK !\n");
}

//------------------------------------------------------------------------------ Update
void update()
{
    //--- UPDATE SOMETHING HERE !

}

//------------------------------------------------------------------------------ Render
void render()
{
    beginRender(_black);
    //--- DRAW SOMETHING HERE !

    endRender(_black);
}

//------------------------------------------------------------------------------ Main entry
int main()
{
    run();
    return log(0,"Program terminated OK !\n");
}

//*******************************************************************************
// TemplateAllegro5.h ***********************************************************
//*******************************************************************************

#ifndef TEMPLATEALLEGRO5_H_INCLUDED
#define TEMPLATEALLEGRO5_H_INCLUDED

//------------------------------------------------------------------------------  Major dependances
#include <allegro5/allegro.h>
#include <allegro5/allegro_font.h>
#include <allegro5/allegro_ttf.h>
#include <allegro5/allegro_primitives.h>
#include <allegro5/allegro_image.h>
#include <allegro5/allegro_native_dialog.h>
#include <allegro5/allegro_audio.h>
#include <allegro5/allegro_acodec.h>
#include <allegro5/allegro_windows.h>

#include <cstdio>
#include <memory>
#include <vector>

#include <iostream>
#include <functional>
#include <fstream>
#include <cstdlib>
#include <ctime>

//------------------------------------------------------------------------------ Debug Methods
template <class E, class M> E log(E error, M msg)
{
    std::cout << msg;
    return error;
}

//------------------------------------------------------------------------------ Globals Var
bool _quit(false);

int _screenW(640);
int _screenH(360);
int _scaleWin(2);

ALLEGRO_COLOR _black({0,0,0});

ALLEGRO_KEYBOARD_STATE _keyState;
ALLEGRO_DISPLAY * _windowDisplay(NULL);
ALLEGRO_BITMAP * _windowBuffer(NULL);

//------------------------------------------------------------------------------ Method declarations
int init(); // Init all here !
int done(); // Done all here !
int initTemplate();
int doneTemplate();
int initWindow(int screenW, int screenH, int scaleWin);

int run(); // Main loop entry !
void update(); // Update in main loop !
void render(); // Render in main loop !

void beginRender(ALLEGRO_COLOR color); // call before begin drawing !
void endRender(ALLEGRO_COLOR color); // call after end drawing !


//------------------------------------------------------------------------------ Render methods
void beginRender(ALLEGRO_COLOR color)
{
    al_set_target_bitmap(_windowBuffer);
    al_clear_to_color(color);
}

void endRender(ALLEGRO_COLOR color)
{
    al_set_target_backbuffer(_windowDisplay);
    al_clear_to_color(color);

    al_draw_scaled_bitmap(_windowBuffer,
                          0,0,_screenW,_screenH,
                          0,0,_screenW*_scaleWin,_screenH*_scaleWin,
                          0);
}

//------------------------------------------------------------------------------ Main loop
int run()
{
    if (initTemplate())
        _quit = true;
    if (init())
        _quit = true;

    while(!_quit)
    {
        al_get_keyboard_state(&_keyState);
        if (al_key_down(&_keyState, ALLEGRO_KEY_ESCAPE))
        _quit = true;
        update();
        render();
        al_flip_display();
    }
    if (done())
        return log(1,"- done Program error !\n");

    if (doneTemplate())
        return log(1,"- done Program error !\n");

    return log(0,"- Main loop terminated OK !\n");
}

//------------------------------------------------------------------------------ Setup Methods
int initWindow(int screenW , int screenH, int scaleWin)
{
    _screenW = screenW;
    _screenH = screenH;
    _scaleWin = scaleWin;

    _windowDisplay = al_create_display(_screenW*_scaleWin,_screenH*_scaleWin);
    if (!_windowDisplay)
        return log(1,"- Unable to create display !\n");

    _windowBuffer = al_create_bitmap(_screenW,_screenH);
    if (!_windowBuffer)
        return log(1,"- Unable to create buffer !\n");

    return log(0,"- Init Window OK !\n");
}

int initTemplate()
{
    // --- Init Allegro 5
    if (!al_init())
        return log(1,"- Unable to init Allegro 5 !\n");

    // --- Install All devices
    if (!al_install_audio())
        return log(1,"- Unable to install Audio ! \n");
    if (!al_install_keyboard())
        return log(1,"- Unable to install Keyboard ! \n");
    if (!al_install_mouse())
        return log(1,"- Unable to install Mouse ! \n");
    if (!al_install_joystick())
        return log(1,"- Unable to install Joystick ! \n");

    // --- Init All addons
    if (!al_init_primitives_addon())
        return log(1,"- Unable to init Primitives Addon ! \n");
    if (!al_init_image_addon())
        return log(1,"- Unable to init Image Addon ! \n");
    if (!al_init_font_addon())
        return log(1,"- Unable to init Font Addon ! \n");
    if (!al_init_ttf_addon())
        return log(1,"- Unable to init TTF Addon ! \n");
    if (!al_init_acodec_addon())
        return log(1,"- Unable to init ACODEC Addon ! \n");

    return log(0,"- init Template OK !\n");
}

int doneTemplate()
{
    if (_windowDisplay) al_destroy_display(_windowDisplay);
    if (_windowBuffer) al_destroy_bitmap(_windowBuffer);

    return log(0,"- done Template OK !\n");
}


#endif // TEMPLATEALLEGRO5_H_INCLUDED