rgb_map(3)                      Allegro manual                      rgb_map(3)



NAME
       rgb_map - Look up table to speed up reducing RGB values to palette
       colors. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>


       extern RGB_MAP *rgb_map;

DESCRIPTION
       To speed up reducing RGB values to 8-bit paletted colors, Allegro uses
       a 32k lookup table (5 bits for each color component). You must set up
       this table before using the gouraud shading routines, and if present
       the table will also vastly accelerate the makecol8() and some
       create_*_table() functions. RGB tables can be precalculated with the
       rgbmap utility, or generated at runtime with create_rgb_table().


SEE ALSO
       create_rgb_table(3), makecol8(3), create_trans_table(3),
       create_light_table(3), create_color_table(3), ex3d(3), excolmap(3),
       exrgbhsv(3), exshade(3), extrans(3)



Allegro                          version 4.2.3                      rgb_map(3)
