1 // 2 // Copyright(C) 1993-1996 Id Software, Inc. 3 // Copyright(C) 2005-2014 Simon Howard 4 // 5 // This program is free software; you can redistribute it and/or 6 // modify it under the terms of the GNU General Public License 7 // as published by the Free Software Foundation; either version 2 8 // of the License, or (at your option) any later version. 9 // 10 // This program is distributed in the hope that it will be useful, 11 // but WITHOUT ANY WARRANTY; without even the implied warranty of 12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 // GNU General Public License for more details. 14 // 15 // DESCRIPTION: 16 // Sky rendering. The DOOM sky is a texture map like any 17 // wall, wrapping around. A 1024 columns equal 360 degrees. 18 // The default sky map is 256 columns and repeats 4 times 19 // on a 320 screen? 20 // 21 // 22 23 24 25 // Needed for FRACUNIT. 26 #include "m_fixed.h" 27 28 // Needed for Flat retrieval. 29 #include "r_data.h" 30 31 32 #include "r_sky.h" 33 34 // 35 // sky mapping 36 // 37 int skyflatnum; 38 int skytexture = -1; // [crispy] initialize 39 int skytexturemid; 40 41 42 43 // 44 // R_InitSkyMap 45 // Called whenever the view size changes. 46 // R_InitSkyMap(void)47void R_InitSkyMap (void) 48 { 49 // skyflatnum = R_FlatNumForName ( SKYFLATNAME ); 50 // [crispy] stretch sky 51 if (skytexture == -1) 52 { 53 return; 54 } 55 if ((crispy->stretchsky = crispy->freelook || crispy->mouselook || crispy->pitch)) 56 { 57 skytexturemid = -28*FRACUNIT * (textureheight[skytexture] >> FRACBITS) / SKYSTRETCH_HEIGHT; 58 } 59 else 60 skytexturemid = ORIGHEIGHT/2*FRACUNIT; 61 } 62 63