1rgb_map(3) Allegro manual rgb_map(3)
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6 rgb_map - Look up table to speed up reducing RGB values to palette col‐
7 ors. Allegro game programming library.
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10 #include <allegro.h>
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13 extern RGB_MAP *rgb_map;
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16 To speed up reducing RGB values to 8-bit paletted colors, Allegro uses
17 a 32k lookup table (5 bits for each color component). You must set up
18 this table before using the gouraud shading routines, and if present
19 the table will also vastly accelerate the makecol8() and some cre‐
20 ate_*_table() functions. RGB tables can be precalculated with the
21 rgbmap utility, or generated at runtime with create_rgb_table().
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25 create_rgb_table(3), makecol8(3), create_trans_table(3), cre‐
26 ate_light_table(3), create_color_table(3), ex3d(3), excolmap(3),
27 exrgbhsv(3), exshade(3), extrans(3)
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31Allegro version 4.4.3 rgb_map(3)