/* Emacs style mode select   -*- C++ -*- 
 *-----------------------------------------------------------------------------
 *
 *
 *  PrBoom a Doom port merged with LxDoom and LSDLDoom
 *  based on BOOM, a modified and improved DOOM engine
 *  Copyright (C) 1999 by
 *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
 *  Copyright (C) 1999-2000 by
 *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
 *  
 *  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.
 *
 * DESCRIPTION:
 *  Sky rendering. The DOOM sky is a texture map like any
 *  wall, wrapping around. A 1024 columns equal 360 degrees.
 *  The default sky map is 256 columns and repeats 4 times
 *  on a 320 screen?
 *
 *-----------------------------------------------------------------------------*/

#ifdef __GNUG__
#pragma implementation "r_sky.h"
#endif
#include "r_sky.h"
#include "r_data.h"
#include "p_info.h"

//
// sky mapping
//
int skyflatnum;
int skytexture;
int skytexturemid;

//
// R_InitSkyMap
// Called whenever the view size changes.
//
void R_InitSkyMap (void)
{
  skytexturemid = 100*FRACUNIT;
}

// called when the level starts to load the appropriate sky

void R_StartSky()
{
  char *texturename=NULL;

  // Set the sky map.
  // First thing, we have a dummy sky texture name,
  //  a flat. The data is in the WAD only because
  //  we look for an actual index, instead of simply
  //  setting one.

  skyflatnum = R_FlatNumForName ( SKYFLATNAME );

  // DOOM determines the sky texture to be used
  // depending on the current episode, and the game version.
  if (gamemode == commercial)
    // || gamemode == pack_tnt   //jff 3/27/98 sorry guys pack_tnt,pack_plut
    // || gamemode == pack_plut) //aren't gamemodes, this was matching retail
    {
      texturename = "SKY3";
      if (gamemap < 12)
        texturename = "SKY1";
      else
        if (gamemap < 21)
          texturename = "SKY2";
    }
  else //jff 3/27/98 and lets not forget about DOOM and Ultimate DOOM huh?
    switch (gameepisode)
      {
      case 1:
        texturename = "SKY1";
        break;
      case 2:
        texturename = "SKY2";
        break;
      case 3:
        texturename = "SKY3";
        break;
      case 4: // Special Edition sky
        texturename = "SKY4";
        break;
      }//jff 3/27/98 end sky setting fix

  if(*info_skyname)
    texturename=info_skyname;

  skytexture = R_TextureNumForName (texturename);

}