/*
Copyright (C) 1996-1997 Id Software, Inc.

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 (at your option) 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// d_modech.c: called when mode has just changed

#include "quakedef.h"
#include "d_local.h"

int d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;

int d_y_aspect_shift, d_pix_min, d_pix_max, d_pix_shift;

int   d_scantable[MAXHEIGHT];
short *zspantable[MAXHEIGHT]; 

/*
================
D_Patch
================
*/
void D_Patch (void)
{
#if id386

  static qboolean protectset8 = false;

  if (!protectset8)
  {
    Sys_MakeCodeWriteable ((int)D_PolysetAff8Start,
                 (int)D_PolysetAff8End - (int)D_PolysetAff8Start);
    protectset8 = true;
  }

#endif  // id386
}


/*
================
D_ViewChanged
================
*/
void D_ViewChanged (void)
{
  int rowbytes;

  if (r_dowarp)
    rowbytes = WARP_WIDTH;
  else
    rowbytes = vid.rowbytes;

  scale_for_mip = xscale;
  if (yscale > xscale)
    scale_for_mip = yscale;

  d_zrowbytes = vid.width * 2;
  d_zwidth = vid.width;

  d_pix_min = r_refdef.vrect.width / 320;
  if (d_pix_min < 1)
    d_pix_min = 1;

  d_pix_max = (int)((float)r_refdef.vrect.width / (320.0 / 4.0) + 0.5);
  d_pix_shift = 8 - (int)((float)r_refdef.vrect.width / 320.0 + 0.5);
  if (d_pix_max < 1)
    d_pix_max = 1;

  if (pixelAspect > 1.4)
    d_y_aspect_shift = 1;
  else
    d_y_aspect_shift = 0;

  d_vrectx = r_refdef.vrect.x;
  d_vrecty = r_refdef.vrect.y;
  d_vrectright_particle = r_refdef.vrectright - d_pix_max;
  d_vrectbottom_particle =
      r_refdef.vrectbottom - (d_pix_max << d_y_aspect_shift);

  {
    int   i;

    for (i=0 ; i<vid.height; i++)
    {
      d_scantable[i] = i*rowbytes;
      zspantable[i] = d_pzbuffer + i*d_zwidth;
    }
  }

  D_Patch ();
}