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(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_bitmap(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)