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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), cre- ate_bitmap(3), create_bitmap_ex(3), create_light_table(3), cre- ate_rgb_table(3), create_trans_table(3), destroy_bitmap(3), draw_trans_sprite(3), drawing_mode(3), install_keyboard(3), in- stall_mouse(3), install_timer(3), keypressed(3), load_bitmap(3), mouse_x(3), mouse_y(3), poll_mouse(3), rectfill(3), replace_file- name(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_al- pha_blender(3), stretch_blit(3) Allegro version 4.4.3 extrans(3)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO
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