main.cpp:
#include <allegro.h>
#include "map.h"

map *game_map;

void init();
void deinit();

extern void initialize_screen();
extern void render();

int main() {
	init();

	while (!key[KEY_ESC]) {
          render();
 
		/* put your code here */
	}

	deinit();
	return 0;
}
END_OF_MAIN()

void init() {
	int depth, res;
	allegro_init();
	depth = desktop_color_depth();
	if (depth == 0) depth = 32;
	set_color_depth(depth);
	res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 800, 600, 0, 0);
	if (res != 0) {
		allegro_message(allegro_error);
		exit(-1);
	}

	install_timer();
	install_keyboard();
	install_mouse();
	initialize_screen();
    game_map = new map(25,25);
	
	/* add other initializations here */
}

void deinit() {
	clear_keybuf();
	/* add other deinitializations here */
}

render.cpp:

#include <allegro.h>
#include "render.h"
#include "map.h"

BITMAP *buffer;
BITMAP *map_screen;

extern map *game_map;

void initialize_screen(){
     buffer = create_bitmap(SCREEN_W,SCREEN_H);
     map_screen = create_bitmap(game_map->map_w * TILE_W,game_map->map_h * TILE_H);
     }

void draw_map(){
                
     }
     
void render(){
     draw_map();
     show_mouse(map_screen);
     blit(map_screen,buffer, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
     textout_ex(buffer, font, "test", 10, 10,makecol(255, 255, 255), -1);
     blit(buffer,screen, 0, 0, 0, 0, SCREEN_W,SCREEN_H);      
     
     }


map.cpp:

#include "map.h"

map::map(){
           }
map::map(int width, int height){
    grid = new tile * [width * height];
    map_w = width;
    map_h = height;
    }
      
tile map::get_tile(int x, int y){
    tile *t = grid[(y * map_h) + x];
    return *t;
    }

map.h:

#include "tiles.h"

class map{
      
      private:
      
      tile **grid;
              
      public:
      
      map(int width, int height);
      
      map();
      
      tile get_tile(int x, int y);

      int map_w;
      
      int map_h;
                     
      };