netbsd man page for create_light_table

create_light_table(3alleg4)					  Allegro manual				       create_light_table(3alleg4)

NAME

       create_light_table - Fills a color mapping table for lighting effects. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void create_light_table(COLOR_MAP *table, const PALETTE pal, int r, g, b, void (*callback)(int pos));

DESCRIPTION

       Fills  the  specified color mapping table with lookup data for doing lighting effects with the specified palette. When combining the colors
       c1 and c2 with this table, c1 is treated as a light level from 0-255. At light level 255 the table will output color c2 unchanged, at light
       level  0  it  will output the r, g, b value you specify to this function, and at intermediate light levels it will output a color somewhere
       between the two extremes. The r, g, and b values are in the range 0-63.

       This function will take advantage of the global rgb_ap variable to speed up color conversions. If the callback function	is  not  NULL,	it
       will be called 256 times during the calculation, allowing you to display a progress indicator. Example:

	  COLOR_MAP light_table;
	  ...
	  /* Build a color lookup table for lighting effects. */
	  create_light_table(&light_table, pal, 0, 0, 0, NULL);

SEE ALSO

       color_map(3alleg4),  create_trans_table(3alleg4),  create_color_table(3alleg4),	create_blender_table(3alleg4), draw_trans_sprite(3alleg4),
       draw_lit_sprite(3alleg4), draw_gouraud_sprite(3alleg4), rgb_map(3alleg4), ex3d(3alleg4), exshade(3alleg4), extrans(3alleg4)

Allegro 							   version 4.4.2				       create_light_table(3alleg4)