man POLYTYPE_FLAT () - Polygon rendering mode type Allegro game programming library.
NAME
POLYTYPE_FLAT - Polygon rendering mode type Allegro game programming library.
SYNOPSIS
#include <allegro.h>
#define POLYTYPE_FLAT
DESCRIPTION
A simple flat shaded polygon, taking the color from the `c' value of the first vertex. This polygon type is affected by the drawing_mode() function, so it can be used to render XOR or translucent polygons.