mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-11-21 20:01:13 +00:00
437 lines
9 KiB
C++
437 lines
9 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include "Precompiled.h"
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#include "globaldata.h"
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#include <stdlib.h>
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#include "i_system.h"
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#include "z_zone.h"
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#include "w_wad.h"
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#include "doomdef.h"
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#include "doomstat.h"
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#include "r_local.h"
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#include "r_sky.h"
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//
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// opening
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//
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// Here comes the obnoxious "visplane".
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//
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// Clip values are the solid pixel bounding the range.
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// ::g->floorclip starts out SCREENHEIGHT
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// ::g->ceilingclip starts out -1
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//
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//
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// ::g->spanstart holds the start of a plane span
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// initialized to 0 at start
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//
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//
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// texture mapping
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//
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//
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// R_InitPlanes
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// Only at game startup.
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//
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void R_InitPlanes (void)
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{
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// Doh!
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}
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//
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// R_MapPlane
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//
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// Uses global vars:
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// ::g->planeheight
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// ::g->ds_source
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// ::g->basexscale
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// ::g->baseyscale
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// ::g->viewx
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// ::g->viewy
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//
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// BASIC PRIMITIVE
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//
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void
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R_MapPlane
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( int y,
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int x1,
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int x2 )
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{
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angle_t angle;
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fixed_t distance;
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fixed_t length;
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unsigned index;
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//#ifdef RANGECHECK
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if ( x2 < x1 || x1<0 || x2>=::g->viewwidth || y>::g->viewheight )
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{
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//I_Error ("R_MapPlane: %i, %i at %i",x1,x2,y);
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return;
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}
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//#endif
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if (::g->planeheight != ::g->cachedheight[y])
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{
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::g->cachedheight[y] = ::g->planeheight;
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distance = ::g->cacheddistance[y] = FixedMul (::g->planeheight, ::g->yslope[y]);
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::g->ds_xstep = ::g->cachedxstep[y] = FixedMul (distance,::g->basexscale);
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::g->ds_ystep = ::g->cachedystep[y] = FixedMul (distance,::g->baseyscale);
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}
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else
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{
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distance = ::g->cacheddistance[y];
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::g->ds_xstep = ::g->cachedxstep[y];
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::g->ds_ystep = ::g->cachedystep[y];
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}
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extern angle_t GetViewAngle();
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length = FixedMul (distance,::g->distscale[x1]);
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angle = (GetViewAngle() + ::g->xtoviewangle[x1])>>ANGLETOFINESHIFT;
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extern fixed_t GetViewX(); extern fixed_t GetViewY();
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::g->ds_xfrac = GetViewX() + FixedMul(finecosine[angle], length);
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::g->ds_yfrac = -GetViewY() - FixedMul(finesine[angle], length);
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if (::g->fixedcolormap)
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::g->ds_colormap = ::g->fixedcolormap;
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else
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{
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index = distance >> LIGHTZSHIFT;
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if (index >= MAXLIGHTZ )
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index = MAXLIGHTZ-1;
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::g->ds_colormap = ::g->planezlight[index];
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}
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::g->ds_y = y;
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::g->ds_x1 = x1;
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::g->ds_x2 = x2;
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// high or low detail
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spanfunc (
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::g->ds_xfrac,
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::g->ds_yfrac,
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::g->ds_y,
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::g->ds_x1,
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::g->ds_x2,
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::g->ds_xstep,
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::g->ds_ystep,
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::g->ds_colormap,
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::g->ds_source );
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}
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//
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// R_ClearPlanes
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// At begining of frame.
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//
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void R_ClearPlanes (void)
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{
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int i;
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angle_t angle;
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// opening / clipping determination
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for (i=0 ; i < ::g->viewwidth ; i++)
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{
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::g->floorclip[i] = ::g->viewheight;
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::g->ceilingclip[i] = -1;
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}
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::g->lastvisplane = ::g->visplanes;
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::g->lastopening = ::g->openings;
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// texture calculation
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memset (::g->cachedheight, 0, sizeof(::g->cachedheight));
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// left to right mapping
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extern angle_t GetViewAngle();
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angle = (GetViewAngle()-ANG90)>>ANGLETOFINESHIFT;
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// scale will be unit scale at SCREENWIDTH/2 distance
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::g->basexscale = FixedDiv (finecosine[angle],::g->centerxfrac);
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::g->baseyscale = -FixedDiv (finesine[angle],::g->centerxfrac);
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}
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//
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// R_FindPlane
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//
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visplane_t* R_FindPlane( fixed_t height, int picnum, int lightlevel ) {
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visplane_t* check;
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if (picnum == ::g->skyflatnum) {
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height = 0; // all skys map together
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lightlevel = 0;
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}
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for (check=::g->visplanes; check < ::g->lastvisplane; check++) {
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if (height == check->height && picnum == check->picnum && lightlevel == check->lightlevel) {
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break;
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}
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}
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if (check < ::g->lastvisplane)
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return check;
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//if (::g->lastvisplane - ::g->visplanes == MAXVISPLANES)
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//I_Error ("R_FindPlane: no more visplanes");
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if ( ::g->lastvisplane - ::g->visplanes == MAXVISPLANES ) {
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check = ::g->visplanes;
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return check;
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}
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::g->lastvisplane++;
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check->height = height;
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check->picnum = picnum;
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check->lightlevel = lightlevel;
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check->minx = SCREENWIDTH;
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check->maxx = -1;
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memset(check->top,0xff,sizeof(check->top));
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return check;
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}
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//
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// R_CheckPlane
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//
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visplane_t*
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R_CheckPlane
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( visplane_t* pl,
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int start,
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int stop )
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{
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int intrl;
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int intrh;
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int unionl;
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int unionh;
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int x;
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if (start < pl->minx)
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{
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intrl = pl->minx;
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unionl = start;
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}
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else
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{
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unionl = pl->minx;
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intrl = start;
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}
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if (stop > pl->maxx)
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{
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intrh = pl->maxx;
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unionh = stop;
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}
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else
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{
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unionh = pl->maxx;
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intrh = stop;
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}
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for (x=intrl ; x<= intrh ; x++)
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if (pl->top[x] != 0xffff)
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break;
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if (x > intrh)
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{
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pl->minx = unionl;
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pl->maxx = unionh;
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// use the same one
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return pl;
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}
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if ( ::g->lastvisplane - ::g->visplanes == MAXVISPLANES ) {
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return pl;
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}
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// make a new visplane
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::g->lastvisplane->height = pl->height;
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::g->lastvisplane->picnum = pl->picnum;
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::g->lastvisplane->lightlevel = pl->lightlevel;
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pl = ::g->lastvisplane++;
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pl->minx = start;
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pl->maxx = stop;
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memset(pl->top,0xff,sizeof(pl->top));
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return pl;
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}
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//
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// R_MakeSpans
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//
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void
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R_MakeSpans
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( int x,
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int t1,
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int b1,
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int t2,
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int b2 )
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{
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while (t1 < t2 && t1<=b1)
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{
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R_MapPlane (t1,::g->spanstart[t1],x-1);
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t1++;
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}
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while (b1 > b2 && b1>=t1)
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{
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R_MapPlane (b1,::g->spanstart[b1],x-1);
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b1--;
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}
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while (t2 < t1 && t2<=b2)
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{
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::g->spanstart[t2] = x;
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t2++;
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}
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while (b2 > b1 && b2>=t2)
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{
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::g->spanstart[b2] = x;
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b2--;
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}
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}
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//
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// R_DrawPlanes
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// At the end of each frame.
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//
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void R_DrawPlanes (void)
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{
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visplane_t* pl;
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int light;
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int x;
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int stop;
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int angle;
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#ifdef RANGECHECK
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if (::g->ds_p - ::g->drawsegs > MAXDRAWSEGS)
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I_Error ("R_DrawPlanes: ::g->drawsegs overflow (%i)",
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::g->ds_p - ::g->drawsegs);
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if (::g->lastvisplane - ::g->visplanes > MAXVISPLANES)
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I_Error ("R_DrawPlanes: visplane overflow (%i)",
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::g->lastvisplane - ::g->visplanes);
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if (::g->lastopening - ::g->openings > MAXOPENINGS)
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I_Error ("R_DrawPlanes: opening overflow (%i)",
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::g->lastopening - ::g->openings);
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#endif
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for (pl = ::g->visplanes ; pl < ::g->lastvisplane ; pl++)
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{
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if (pl->minx > pl->maxx)
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continue;
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// sky flat
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if (pl->picnum == ::g->skyflatnum)
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{
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::g->dc_iscale = ::g->pspriteiscale>>::g->detailshift;
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// Sky is allways drawn full bright,
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// i.e. ::g->colormaps[0] is used.
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// Because of this hack, sky is not affected
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// by INVUL inverse mapping.
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::g->dc_colormap = ::g->colormaps;
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::g->dc_texturemid = ::g->skytexturemid;
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for (x=pl->minx ; x <= pl->maxx ; x++)
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{
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::g->dc_yl = pl->top[x];
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::g->dc_yh = pl->bottom[x];
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if (::g->dc_yl <= ::g->dc_yh)
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{
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extern angle_t GetViewAngle();
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angle = (GetViewAngle() + ::g->xtoviewangle[x])>>ANGLETOSKYSHIFT;
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::g->dc_x = x;
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::g->dc_source = R_GetColumn(::g->skytexture, angle);
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colfunc ( ::g->dc_colormap, ::g->dc_source );
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}
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}
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continue;
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}
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// regular flat
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::g->ds_source = (byte*)W_CacheLumpNum(::g->firstflat +
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::g->flattranslation[pl->picnum],
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PU_CACHE_SHARED);
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::g->planeheight = abs(pl->height-::g->viewz);
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light = (pl->lightlevel >> LIGHTSEGSHIFT)+::g->extralight;
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if (light >= LIGHTLEVELS)
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light = LIGHTLEVELS-1;
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if (light < 0)
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light = 0;
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::g->planezlight = ::g->zlight[light];
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pl->top[pl->maxx+1] = 0xffff;
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pl->top[pl->minx-1] = 0xffff;
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stop = pl->maxx + 1;
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for (x=pl->minx ; x<= stop ; x++)
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{
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R_MakeSpans(x,pl->top[x-1],
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pl->bottom[x-1],
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pl->top[x],
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pl->bottom[x]);
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}
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}
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}
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