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create_light_table(3alleg4) [opendarwin man page]

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

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)

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extrans(3alleg4)						  Allegro manual						  extrans(3alleg4)

extrans - Lighting and translucency effects. Allegro game programming library. SYNOPSIS
#include <allegro.h> Example extrans DESCRIPTION
This program demonstrates how to use the lighting and translucency functions. The first part of the example will show a dark screen illumi- nated by a spotlight you can move with your mouse. After a key press the example shows the full bitmap and the spotlight changes to be a reduced version of the background with 50% of translucency. The translucency effect is easy to do in all color depths. However, the lighting effect has to be performed in a different way depending on whether the screen is in 8bit mode or another color depth. This is because additive drawing mode uses a different set of routines for truecolor modes. SEE ALSO
BITMAP(3alleg4), COLOR_MAP(3alleg4), END_OF_MAIN(3alleg4), PALETTE(3alleg4), RGB(3alleg4), RGB_MAP(3alleg4), SCREEN_H(3alleg4), SCREEN_W(3alleg4), allegro_error(3alleg4), allegro_init(3alleg4), allegro_message(3alleg4), bitmap_color_depth(3alleg4), blit(3alleg4), circlefill(3alleg4), clear_bitmap(3alleg4), clear_keybuf(3alleg4), color_map(3alleg4), create_bitmap(3alleg4), create_bitmap_ex(3alleg4), create_light_table(3alleg4), create_rgb_table(3alleg4), create_trans_table(3alleg4), destroy_bitmap(3alleg4), draw_trans_sprite(3alleg4), drawing_mode(3alleg4), install_keyboard(3alleg4), install_mouse(3alleg4), install_timer(3alleg4), keypressed(3alleg4), load_bit- map(3alleg4), mouse_x(3alleg4), mouse_y(3alleg4), poll_mouse(3alleg4), rectfill(3alleg4), replace_filename(3alleg4), rest(3alleg4), rgb_map(3alleg4), screen(3alleg4), set_alpha_blender(3alleg4), set_gfx_mode(3alleg4), set_palette(3alleg4), set_trans_blender(3alleg4), set_write_alpha_blender(3alleg4), stretch_blit(3alleg4) Allegro version 4.4.2 extrans(3alleg4)
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