create_trans_table(3alleg4) [plan9 man page]
create_trans_table(3alleg4) Allegro manual create_trans_table(3alleg4) NAME
create_trans_table - Fills a color mapping table for translucency effects. Allegro game programming library. SYNOPSIS
#include <allegro.h> void create_trans_table(COLOR_MAP *table, const PALETTE pal, int r, g, b, void (*callback)(int pos)); DESCRIPTION
Fills the specified color mapping table with lookup data for doing translucency effects with the specified palette. When combining the col- ors c1 and c2 with this table, the result will be a color somewhere between the two. The r, g, and b parameters specify the solidity of each color component, ranging from 0 (totally transparent) to 255 (totally solid). For 50% solidity, pass 128. This function treats source color #0 as a special case, leaving the destination unchanged whenever a zero source pixel is encountered, so that masked sprites will draw correctly. This function will take advantage of the global rgb_map variable to speed up color conversions. If the callback function is not NULL, it will be called 256 times during the calculation, allowing you to display a progress indicator. Exam- ple: COLOR_MAP trans_table; ... /* Build a color lookup table for translucent drawing. */ create_trans_table(&trans_table, pal, 128, 128, 128, NULL); SEE ALSO
color_map(3alleg4), create_light_table(3alleg4), create_color_table(3alleg4), create_blender_table(3alleg4), draw_trans_sprite(3alleg4), draw_lit_sprite(3alleg4), draw_gouraud_sprite(3alleg4), rgb_map(3alleg4), ex3d(3alleg4), extrans(3alleg4) Allegro version 4.4.2 create_trans_table(3alleg4)
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extrans(3alleg4) Allegro manual extrans(3alleg4) 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 illumi- nated 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_bit- map(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) Allegro version 4.4.2 extrans(3alleg4)