text: /*
  *   Glide64 - Glide video plugin for Nintendo 64 emulators.
  *   Copyright (c) 2002  Dave2001
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public
  *   License along with this program; if not, write to the Free
  *   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 
  *   Boston, MA  02110-1301, USA
  */
  
  //****************************************************************
  //
  // Glide64 - Glide Plugin for Nintendo 64 emulators (tested mostly with Project64)
  // Project started on December 29th, 2001
  //
  // To modify Glide64:
  // * Write your name and (optional)email, commented by your work, so I know who did it, and so that you can find which parts you modified when it comes time to send it to me.
  // * Do NOT send me the whole project or file that you modified.  Take out your modified code sections, and tell me where to put them.  If people sent the whole thing, I would have many different versions, but no idea how to combine them all.
  //
  // Official Glide64 development channel: #Glide64 on EFnet
  //
  // Original author: Dave2001 (Dave2999@hotmail.com)
  // Other authors: Gonetz, Gugaman
  //
  //****************************************************************
  
  #ifndef Util_H
  #define Util_H
  
  #include "winlnxdefs.h"
  #include "rdp.h"
  
  #define NOT_TMU0    0x00
  #define NOT_TMU1    0x01
  #define NOT_TMU2    0x02
  
  void util_init ();
  void clip_z ();
  void clip_tri (WORD linew = 0);
  
  BOOL cull_tri (VERTEX **v);
  void DrawTri (VERTEX **v, WORD linew = 0);
  void do_triangle_stuff (WORD linew = 0);
  void do_triangle_stuff_2 (WORD linew = 0);
  void add_tri (VERTEX *v, int n, int type);
  void apply_shade_mods (VERTEX *v);
  
  void update ();
  void update_scissor ();
  
  void set_message_combiner ();
  
  void fix_tex_coord (VERTEX **v);
  
  // positional and texel coordinate clipping
  #define CCLIP(ux,lx,ut,lt,uc,lc) \
          if (ux > lx || lx < uc || ux > lc) { rdp.tri_n += 2; return; } \
          if (ux < uc) { \
              float p = (uc-ux)/(lx-ux); \
              ut = p*(lt-ut)+ut; \
              ux = uc; \
          } \
          if (lx > lc) { \
              float p = (lc-ux)/(lx-ux); \
              lt = p*(lt-ut)+ut; \
              lx = lc; \
          }
  
  #define CCLIP2(ux,lx,ut,lt,un,ln,uc,lc) \
          if (ux > lx || lx < uc || ux > lc) { rdp.tri_n += 2; return; } \
          if (ux < uc) { \
              float p = (uc-ux)/(lx-ux); \
              ut = p*(lt-ut)+ut; \
              un = p*(ln-un)+un; \
              ux = uc; \
          } \
          if (lx > lc) { \
              float p = (lc-ux)/(lx-ux); \
              lt = p*(lt-ut)+ut; \
              ln = p*(ln-un)+un; \
              lx = lc; \
          }
  
  #endif  // ifndef Util_H
  
  