NAME
draw_gouraud_sprite - Draws a sprite with gouraud shading. Allegro game
programming library.
SYNOPSIS
#include <allegro.h>
void draw_gouraud_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y, int
c1, int c2, int c3, int c4);
DESCRIPTION
More sophisticated version of draw_lit_sprite(): the 'color' parameter
is not constant across the sprite image anymore but interpolated
between the four specified corner colors. The corner values passed to
this function indicate the strength of the color applied on them,
ranging from 0 (no strength) to 255 (full strength). Example:
/* Some one time initialisation code. */
COLOR_MAP global_light_table;
create_light_table(&global_trans_table, my_palette,
0, 0, 0, NULL);
...
if (get_color_depth() == 8)
color_map = &global_light_table;
else
set_trans_blender(0, 0, 0, 128);
/* Enemies are in shadow unless lit by torch. */
draw_gouraud_sprite(buffer, menacing_spy, x, y,
light_strength_on_corner_1,
light_strength_on_corner_2,
light_strength_on_corner_3,
light_strength_on_corner_4);
SEE ALSO
draw_sprite(3alleg), draw_lit_sprite(3alleg), color_map(3alleg),
set_trans_blender(3alleg), bitmap_mask_color(3alleg), exshade(3alleg)