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draw_gouraud_sprite(3)          Allegro manual          draw_gouraud_sprite(3)

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

Allegro                          version 4.4.2          draw_gouraud_sprite(3)