POLYTYPE_PTEX - Polygon rendering mode type Allegro game programming library.

       A  perspective-correct  texture mapped polygon. This uses the `z' value from the vertex structure as well
       as the u/v coordinates, so textures are displayed correctly regardless of the angle they are viewed from.
       Because it involves division calculations in the inner texture mapping loop, this mode is  a  lot  slower
       than  POLYTYPE_ATEX,  and  it uses floating point so it will be very slow on anything less than a Pentium
       (even with an FPU, a 486 can't overlap floating point division with other  integer  operations  like  the
       Pentium can).

       POLYTYPE_PTEX - Polygon rendering mode type Allegro game programming library.

polygon3d(3alleg4), POLYTYPE_ATEX(3alleg4), ex3d(3alleg4)

Allegro                                           version 4.4.3                           POLYTYPE_PTEX(3alleg4)

#include<allegro.h>#definePOLYTYPE_PTEX