19fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream/* 29fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamCopyright (C) 1996-1997 Id Software, Inc. 39fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 49fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamThis program is free software; you can redistribute it and/or 59fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreammodify it under the terms of the GNU General Public License 69fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamas published by the Free Software Foundation; either version 2 79fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamof the License, or (at your option) any later version. 89fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 99fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamThis program is distributed in the hope that it will be useful, 109fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreambut WITHOUT ANY WARRANTY; without even the implied warranty of 119fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 129fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 139fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamSee the GNU General Public License for more details. 149fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 159fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamYou should have received a copy of the GNU General Public License 169fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamalong with this program; if not, write to the Free Software 179fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamFoundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 189fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 199fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream*/ 209fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream// d_sky.c 219fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 229fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream#include "quakedef.h" 239fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream#include "r_local.h" 249fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream#include "d_local.h" 259fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 269fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream#define SKY_SPAN_SHIFT 5 279fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream#define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT) 289fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 299fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 309fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream/* 319fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream================= 329fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamD_Sky_uv_To_st 339fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream================= 349fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream*/ 359fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamvoid D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t) 369fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream{ 379fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream float wu, wv, temp; 389fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream vec3_t end; 399fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 409fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream if (r_refdef.vrect.width >= r_refdef.vrect.height) 419fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream temp = (float)r_refdef.vrect.width; 429fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream else 439fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream temp = (float)r_refdef.vrect.height; 449fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 459fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream wu = 8192.0 * (float)(u-((int)vid.width>>1)) / temp; 469fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream wv = 8192.0 * (float)(((int)vid.height>>1)-v) / temp; 479fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 489fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream end[0] = 4096*vpn[0] + wu*vright[0] + wv*vup[0]; 499fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream end[1] = 4096*vpn[1] + wu*vright[1] + wv*vup[1]; 509fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream end[2] = 4096*vpn[2] + wu*vright[2] + wv*vup[2]; 519fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream end[2] *= 3; 529fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream VectorNormalize (end); 539fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 549fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream temp = skytime*skyspeed; // TODO: add D_SetupFrame & set this there 559fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream *s = (int)((temp + 6*(SKYSIZE/2-1)*end[0]) * 0x10000); 569fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream *t = (int)((temp + 6*(SKYSIZE/2-1)*end[1]) * 0x10000); 579fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream} 589fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 599fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 609fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream/* 619fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream================= 629fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamD_DrawSkyScans8 639fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream================= 649fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream*/ 659fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstreamvoid D_DrawSkyScans8 (espan_t *pspan) 669fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream{ 679fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream int count, spancount, u, v; 689fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream unsigned char *pdest; 699fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream fixed16_t s, t, snext, tnext, sstep, tstep; 709fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream int spancountminus1; 719fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 729fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream sstep = 0; // keep compiler happy 739fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream tstep = 0; // ditto 749fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 759fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream do 769fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 779fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream pdest = (unsigned char *)((byte *)d_viewbuffer + 789fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream (screenwidth * pspan->v) + pspan->u); 799fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 809fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream count = pspan->count; 819fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 829fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream // calculate the initial s & t 839fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream u = pspan->u; 849fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream v = pspan->v; 859fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream D_Sky_uv_To_st (u, v, &s, &t); 869fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 879fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream do 889fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 899fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream if (count >= SKY_SPAN_MAX) 909fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream spancount = SKY_SPAN_MAX; 919fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream else 929fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream spancount = count; 939fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 949fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream count -= spancount; 959fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 969fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream if (count) 979fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 989fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream u += spancount; 999fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1009fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream // calculate s and t at far end of span, 1019fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream // calculate s and t steps across span by shifting 1029fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream D_Sky_uv_To_st (u, v, &snext, &tnext); 1039fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1049fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream sstep = (snext - s) >> SKY_SPAN_SHIFT; 1059fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream tstep = (tnext - t) >> SKY_SPAN_SHIFT; 1069fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } 1079fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream else 1089fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 1099fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream // calculate s and t at last pixel in span, 1109fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream // calculate s and t steps across span by division 1119fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream spancountminus1 = (float)(spancount - 1); 1129fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1139fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream if (spancountminus1 > 0) 1149fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 1159fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream u += spancountminus1; 1169fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream D_Sky_uv_To_st (u, v, &snext, &tnext); 1179fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1189fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream sstep = (snext - s) / spancountminus1; 1199fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream tstep = (tnext - t) / spancountminus1; 1209fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } 1219fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } 1229fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1239fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream do 1249fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream { 1259fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream *pdest++ = r_skysource[((t & R_SKY_TMASK) >> 8) + 1269fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream ((s & R_SKY_SMASK) >> 16)]; 1279fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream s += sstep; 1289fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream t += tstep; 1299fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } while (--spancount > 0); 1309fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1319fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream s = snext; 1329fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream t = tnext; 1339fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1349fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } while (count > 0); 1359fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 1369fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream } while ((pspan = pspan->pnext) != NULL); 1379fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream} 1389fd67c44777b350dc56f3e70c88963b0d966ffc7quake upstream 139