extrans
Section: Allegro manual (3)
Updated: version 4.2.2
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NAME
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 illuminated 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(3),
COLOR_MAP(3),
END_OF_MAIN(3),
PALETTE(3),
RGB(3),
RGB_MAP(3),
SCREEN_H(3),
SCREEN_W(3),
allegro_error(3),
allegro_init(3),
allegro_message(3),
bitmap_color_depth(3),
blit(3),
circlefill(3),
clear_bitmap(3),
clear_keybuf(3),
color_map(3),
create_bitmap(3),
create_bitmap_ex(3),
create_light_table(3),
create_rgb_table(3),
create_trans_table(3),
destroy_bitmap(3),
draw_trans_sprite(3),
drawing_mode(3),
install_keyboard(3),
install_mouse(3),
install_timer(3),
keypressed(3),
load_bitmap(3),
mouse_x(3),
mouse_y(3),
poll_mouse(3),
rectfill(3),
replace_filename(3),
rest(3),
rgb_map(3),
screen(3),
set_alpha_blender(3),
set_gfx_mode(3),
set_palette(3),
set_trans_blender(3),
set_write_alpha_blender(3),
stretch_blit(3)