debian man page for draw_gouraud_sprite

draw_gouraud_sprite(3alleg4)					  Allegro manual				      draw_gouraud_sprite(3alleg4)

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(3alleg4),	 draw_lit_sprite(3alleg4),     color_map(3alleg4),     set_trans_blender(3alleg4),     bitmap_mask_color(3alleg4),
       exshade(3alleg4)

Allegro 							   version 4.4.2				      draw_gouraud_sprite(3alleg4)