From: Ryan Gumbs <gumby AT ao DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: problems with Allegro polygon3d_f and txtrmapping
Date: 22 May 1999 12:21:11 GMT
Organization: Access Orlando (407) 895-1200
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To: djgpp AT delorie DOT com
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can anyone please tell me what is wrong with the code below.
i am trying to do txtr-mapping with allegro but i am getting
garbage when it draws the triangle.  the image loads and 
displays correctly but the triangle is screwed up.

i have spent hours looking at this and can't find out why its
not working.
thanx to anyone who can help.
Ryan Gumbs.

#include "allegro.h"

PALETTE pal;
V3D_f v[4]= {
  { 0,  0, 0,  0,  0},
  {90,  0, 0, 90,  0},
  {90, 90, 0, 90, 90},
  { 0, 90, 0,  0, 90},
  };

V3D_f *pv[4]={v+0,v+1,v+2,v+3};

BITMAP *map, *buf;

void main() {
int i;

allegro_init();
set_color_conversion(COLORCONV_TOTAL);
set_color_depth(8);

map= load_bitmap("landtxtr.pcx", pal);
set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0);
buf=create_bitmap(SCREEN_W, SCREEN_H);
set_palette(pal);
clear(buf);
blit (map, buf, 0, 0, 100, 100, map->w, map->h);
triangle3d_f (buf, POLYTYPE_ATEX, map, v+0, v+1, v+2);
//polygon3d_f (buf, POLYTYPE_ATEX, map, 3, pv);
blit(buf, screen,0,0,0,0,buf->w, buf->h);
getch();
allegro_exit();
}