extrans man page on DragonFly
[printable version]
extrans(3) Allegro manual extrans(3)
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 illu‐
minated 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), alle‐
gro_init(3), allegro_message(3), bitmap_color_depth(3), blit(3), cir‐
clefill(3), clear_bitmap(3), clear_keybuf(3), color_map(3), create_bit‐
map(3), create_bitmap_ex(3), create_light_table(3), create_rgb_ta‐
ble(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_pal‐
ette(3), set_trans_blender(3), set_write_alpha_blender(3),
stretch_blit(3)
Allegro version 4.4.2 extrans(3)
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