color_map - Global pointer to the color mapping table. Allegro game programming library.

       Global  pointer  to  the  color  mapping table. You must allocate your own COLOR_MAP either statically or
       dynamically and set color_map to it before using any translucent or lit drawing functions in a  256-color
       video mode! Example:

          color_map = malloc(sizeof(COLOR_MAP));
          if (!color_map)
             abort_on_error("Not enough memory for color map!");

       color_map - Global pointer to the color mapping table. Allegro game programming library.

create_color_table(3alleg4),           create_light_table(3alleg4),          create_trans_table(3alleg4),
       create_blender_table(3alleg4),          set_trans_blender(3alleg4),           draw_trans_sprite(3alleg4),
       draw_lit_sprite(3alleg4),     draw_gouraud_sprite(3alleg4),     drawing_mode(3alleg4),     ex3d(3alleg4),
       excolmap(3alleg4), exlights(3alleg4), exshade(3alleg4), extrans(3alleg4)

Allegro                                           version 4.4.3                               color_map(3alleg4)

#include<allegro.h>externCOLOR_MAP*color_map;