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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 re-
       duced 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  be-
       cause  additive drawing mode uses a different set of routines for true-
       color 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),	   in-
       stall_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)

Allegro				 version 4.4.2			    extrans(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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