apps/plugins/doom/r_sky.c

   1 /* Emacs style mode select   -*- C++ -*-
   2  *-----------------------------------------------------------------------------
   3  *
   4  *
   5  *  PrBoom a Doom port merged with LxDoom and LSDLDoom
   6  *  based on BOOM, a modified and improved DOOM engine
   7  *  Copyright (C) 1999 by
   8  *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
   9  *  Copyright (C) 1999-2000 by
  10  *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
  11  *
  12  *  This program is free software; you can redistribute it and/or
  13  *  modify it under the terms of the GNU General Public License
  14  *  as published by the Free Software Foundation; either version 2
  15  *  of the License, or (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  25  *  02111-1307, USA.
  26  *
  27  * DESCRIPTION:
  28  *  Sky rendering. The DOOM sky is a texture map like any
  29  *  wall, wrapping around. A 1024 columns equal 360 degrees.
  30  *  The default sky map is 256 columns and repeats 4 times
  31  *  on a 320 screen?
  32  *
  33  *-----------------------------------------------------------------------------*/
  34
  35 #ifdef __GNUG__
  36 #pragma implementation "r_sky.h"
  37 #endif
  38 #include "r_sky.h"
  39 //
  40 // sky mapping
  41 //
  42 int skyflatnum;
  43 int skytexture;
  44 int skytexturemid;
  45
  46 //
  47 // R_InitSkyMap
  48 // Called whenever the view size changes.
  49 //
  50 void R_InitSkyMap (void)
  51 {
  52    skytexturemid = 100*FRACUNIT;
  53 }