polytype_grgb(3alleg4) [plan9 man page]

POLYTYPE_GRGB(3alleg4)						  Allegro manual					    POLYTYPE_GRGB(3alleg4)

NAME

       POLYTYPE_GRGB - Polygon rendering mode type Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       #define POLYTYPE_GRGB

DESCRIPTION

       A  gouraud shaded polygon which interpolates RGB triplets rather than a single color. In 256-color modes this uses the global rgb_map table
       to convert the result to an 8-bit paletted color, so it must only be used after you have set up the RGB mapping table! The colors for  each
       vertex  are  taken  from  the  `c' value, which is interpreted as a 24-bit RGB triplet (0xFF0000 is red, 0x00FF00 is green, and 0x0000FF is
       blue).

SEE ALSO

       polygon3d(3alleg4), rgb_map(3alleg4), ex3d(3alleg4)

Allegro 							   version 4.4.2					    POLYTYPE_GRGB(3alleg4)

rgb_map(3alleg4)						  Allegro manual						  rgb_map(3alleg4)

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  cre-
       ate_*_table() functions. RGB tables can be precalculated with the rgbmap utility, or generated at runtime with create_rgb_table().

SEE ALSO

       create_rgb_table(3alleg4),   makecol8(3alleg4),	 create_trans_table(3alleg4),	create_light_table(3alleg4),  create_color_table(3alleg4),
       ex3d(3alleg4), excolmap(3alleg4), exrgbhsv(3alleg4), exshade(3alleg4), extrans(3alleg4)

Allegro 							   version 4.4.2						  rgb_map(3alleg4)