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649 lines
17 KiB
C
649 lines
17 KiB
C
/* Emacs style mode select -*- C++ -*-
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*-----------------------------------------------------------------------------
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*
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*
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* PrBoom: a Doom port merged with LxDoom and LSDLDoom
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* based on BOOM, a modified and improved DOOM engine
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* Copyright (C) 1999 by
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* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
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* Copyright (C) 1999-2000 by
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* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
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* Copyright 2005, 2006 by
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* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* DESCRIPTION:
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* Rendering main loop and setup functions,
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* utility functions (BSP, geometry, trigonometry).
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* See tables.c, too.
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*
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*-----------------------------------------------------------------------------*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef USE_SDL
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#include "SDL.h"
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#endif
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#include "doomstat.h"
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#include "d_net.h"
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#include "w_wad.h"
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#include "r_main.h"
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#include "r_things.h"
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#include "r_plane.h"
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#include "r_bsp.h"
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#include "r_draw.h"
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#include "m_bbox.h"
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#include "r_sky.h"
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#include "v_video.h"
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#include "lprintf.h"
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#include "st_stuff.h"
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#include "i_main.h"
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#include "i_system.h"
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#include "g_game.h"
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#include "r_demo.h"
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#include "r_fps.h"
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// Fineangles in the SCREENWIDTH wide window.
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#define FIELDOFVIEW 2048
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// killough: viewangleoffset is a legacy from the pre-v1.2 days, when Doom
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// had Left/Mid/Right viewing. +/-ANG90 offsets were placed here on each
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// node, by d_net.c, to set up a L/M/R session.
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int viewangleoffset;
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int validcount = 1; // increment every time a check is made
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const lighttable_t *fixedcolormap;
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int centerx, centery;
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fixed_t centerxfrac, centeryfrac;
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fixed_t viewheightfrac; //e6y: for correct clipping of things
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fixed_t projection;
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// proff 11/06/98: Added for high-res
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fixed_t projectiony;
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fixed_t viewx, viewy, viewz;
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angle_t viewangle;
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fixed_t viewcos, viewsin;
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player_t *viewplayer;
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extern lighttable_t **walllights;
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static mobj_t *oviewer;
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//
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// precalculated math tables
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//
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angle_t clipangle;
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// The viewangletox[viewangle + FINEANGLES/4] lookup
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// maps the visible view angles to screen X coordinates,
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// flattening the arc to a flat projection plane.
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// There will be many angles mapped to the same X.
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int viewangletox[FINEANGLES/2];
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// The xtoviewangleangle[] table maps a screen pixel
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// to the lowest viewangle that maps back to x ranges
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// from clipangle to -clipangle.
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angle_t xtoviewangle[MAX_SCREENWIDTH+1]; // killough 2/8/98
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// killough 3/20/98: Support dynamic colormaps, e.g. deep water
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// killough 4/4/98: support dynamic number of them as well
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int numcolormaps;
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const lighttable_t *(*c_zlight)[LIGHTLEVELS][MAXLIGHTZ];
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const lighttable_t *(*zlight)[MAXLIGHTZ];
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const lighttable_t *fullcolormap;
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const lighttable_t **colormaps;
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// killough 3/20/98, 4/4/98: end dynamic colormaps
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int extralight; // bumped light from gun blasts
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//
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// R_PointOnSide
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// Traverse BSP (sub) tree,
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// check point against partition plane.
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// Returns side 0 (front) or 1 (back).
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//
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// killough 5/2/98: reformatted
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//
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PUREFUNC int R_PointOnSide(fixed_t x, fixed_t y, const node_t *node)
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{
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if (!node->dx)
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return x <= node->x ? node->dy > 0 : node->dy < 0;
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if (!node->dy)
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return y <= node->y ? node->dx < 0 : node->dx > 0;
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x -= node->x;
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y -= node->y;
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// Try to quickly decide by looking at sign bits.
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if ((node->dy ^ node->dx ^ x ^ y) < 0)
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return (node->dy ^ x) < 0; // (left is negative)
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return FixedMul(y, node->dx>>FRACBITS) >= FixedMul(node->dy>>FRACBITS, x);
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}
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// killough 5/2/98: reformatted
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PUREFUNC int R_PointOnSegSide(fixed_t x, fixed_t y, const seg_t *line)
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{
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fixed_t lx = line->v1->x;
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fixed_t ly = line->v1->y;
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fixed_t ldx = line->v2->x - lx;
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fixed_t ldy = line->v2->y - ly;
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if (!ldx)
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return x <= lx ? ldy > 0 : ldy < 0;
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if (!ldy)
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return y <= ly ? ldx < 0 : ldx > 0;
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x -= lx;
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y -= ly;
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// Try to quickly decide by looking at sign bits.
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if ((ldy ^ ldx ^ x ^ y) < 0)
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return (ldy ^ x) < 0; // (left is negative)
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return FixedMul(y, ldx>>FRACBITS) >= FixedMul(ldy>>FRACBITS, x);
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}
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//
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// R_PointToAngle
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// To get a global angle from cartesian coordinates,
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// the coordinates are flipped until they are in
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// the first octant of the coordinate system, then
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// the y (<=x) is scaled and divided by x to get a
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// tangent (slope) value which is looked up in the
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// tantoangle[] table. The +1 size of tantoangle[]
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// is to handle the case when x==y without additional
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// checking.
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//
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// killough 5/2/98: reformatted, cleaned up
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#include <math.h>
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angle_t R_PointToAngle(fixed_t x, fixed_t y)
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{
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static fixed_t oldx, oldy;
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static angle_t oldresult;
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x -= viewx; y -= viewy;
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if ( /* !render_precise && */
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// e6y: here is where "slime trails" can SOMETIMES occur
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#ifdef GL_DOOM
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(V_GetMode() != VID_MODEGL) &&
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#endif
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(x < INT_MAX/4 && x > -INT_MAX/4 && y < INT_MAX/4 && y > -INT_MAX/4)
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)
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{
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// old R_PointToAngle
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return (x || y) ?
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x >= 0 ?
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y >= 0 ?
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(x > y) ? tantoangle[SlopeDiv(y,x)] : // octant 0
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ANG90-1-tantoangle[SlopeDiv(x,y)] : // octant 1
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x > (y = -y) ? 0-tantoangle[SlopeDiv(y,x)] : // octant 8
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ANG270+tantoangle[SlopeDiv(x,y)] : // octant 7
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y >= 0 ? (x = -x) > y ? ANG180-1-tantoangle[SlopeDiv(y,x)] : // octant 3
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ANG90 + tantoangle[SlopeDiv(x,y)] : // octant 2
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(x = -x) > (y = -y) ? ANG180+tantoangle[ SlopeDiv(y,x)] : // octant 4
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ANG270-1-tantoangle[SlopeDiv(x,y)] : // octant 5
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0;
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}
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// R_PointToAngleEx merged into R_PointToAngle
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// e6y: The precision of the code above is abysmal so use the CRT atan2 function instead!
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if (oldx != x || oldy != y)
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{
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oldx = x;
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oldy = y;
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oldresult = (int)(atan2(y, x) * ANG180/M_PI);
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}
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return oldresult;
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}
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angle_t R_PointToAngle2(fixed_t viewx, fixed_t viewy, fixed_t x, fixed_t y)
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{
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return (y -= viewy, (x -= viewx) || y) ?
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x >= 0 ?
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y >= 0 ?
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(x > y) ? tantoangle[SlopeDiv(y,x)] : // octant 0
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ANG90-1-tantoangle[SlopeDiv(x,y)] : // octant 1
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x > (y = -y) ? 0-tantoangle[SlopeDiv(y,x)] : // octant 8
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ANG270+tantoangle[SlopeDiv(x,y)] : // octant 7
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y >= 0 ? (x = -x) > y ? ANG180-1-tantoangle[SlopeDiv(y,x)] : // octant 3
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ANG90 + tantoangle[SlopeDiv(x,y)] : // octant 2
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(x = -x) > (y = -y) ? ANG180+tantoangle[ SlopeDiv(y,x)] : // octant 4
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ANG270-1-tantoangle[SlopeDiv(x,y)] : // octant 5
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0;
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}
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//
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// R_InitTextureMapping
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//
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// killough 5/2/98: reformatted
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static void R_InitTextureMapping (void)
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{
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register int i,x;
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fixed_t focallength;
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// Use tangent table to generate viewangletox:
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// viewangletox will give the next greatest x
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// after the view angle.
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//
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// Calc focallength
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// so FIELDOFVIEW angles covers SCREENWIDTH.
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focallength = FixedDiv(centerxfrac, finetangent[FINEANGLES/4+FIELDOFVIEW/2]);
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for (i=0 ; i<FINEANGLES/2 ; i++)
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{
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int t;
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if (finetangent[i] > FRACUNIT*2)
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t = -1;
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else
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if (finetangent[i] < -FRACUNIT*2)
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t = viewwidth+1;
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else
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{
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t = FixedMul(finetangent[i], focallength);
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t = (centerxfrac - t + FRACUNIT-1) >> FRACBITS;
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if (t < -1)
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t = -1;
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else
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if (t > viewwidth+1)
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t = viewwidth+1;
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}
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viewangletox[i] = t;
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}
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// Scan viewangletox[] to generate xtoviewangle[]:
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// xtoviewangle will give the smallest view angle
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// that maps to x.
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for (x=0; x<=viewwidth; x++)
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{
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for (i=0; viewangletox[i] > x; i++)
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;
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xtoviewangle[x] = (i<<ANGLETOFINESHIFT)-ANG90;
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}
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// Take out the fencepost cases from viewangletox.
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for (i=0; i<FINEANGLES/2; i++)
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if (viewangletox[i] == -1)
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viewangletox[i] = 0;
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else
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if (viewangletox[i] == viewwidth+1)
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viewangletox[i] = viewwidth;
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clipangle = xtoviewangle[0];
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}
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//
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// R_InitLightTables
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//
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#define DISTMAP 2
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static void R_InitLightTables (void)
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{
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int i;
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// killough 4/4/98: dynamic colormaps
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c_zlight = malloc(sizeof(*c_zlight) * numcolormaps);
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// Calculate the light levels to use
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// for each level / distance combination.
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for (i=0; i< LIGHTLEVELS; i++)
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{
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int j, startmap = ((LIGHTLEVELS-1-i)*2)*NUMCOLORMAPS/LIGHTLEVELS;
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for (j=0; j<MAXLIGHTZ; j++)
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{
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// CPhipps - use 320 here instead of SCREENWIDTH, otherwise hires is
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// brighter than normal res
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int scale = FixedDiv ((320/2*FRACUNIT), (j+1)<<LIGHTZSHIFT);
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int t, level = startmap - (scale >>= LIGHTSCALESHIFT)/DISTMAP;
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if (level < 0)
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level = 0;
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else
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if (level >= NUMCOLORMAPS)
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level = NUMCOLORMAPS-1;
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// killough 3/20/98: Initialize multiple colormaps
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level *= 256;
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for (t=0; t<numcolormaps; t++) // killough 4/4/98
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c_zlight[t][i][j] = colormaps[t] + level;
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}
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}
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}
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//
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// R_SetViewSize
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// Do not really change anything here,
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// because it might be in the middle of a refresh.
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// The change will take effect next refresh.
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//
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boolean setsizeneeded;
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int setblocks;
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void R_SetViewSize(int blocks)
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{
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setsizeneeded = true;
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setblocks = blocks;
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}
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//
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// R_ExecuteSetViewSize
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//
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void R_ExecuteSetViewSize (void)
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{
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int i;
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setsizeneeded = false;
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if (setblocks == 11)
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{
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scaledviewwidth = SCREENWIDTH;
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viewheight = SCREENHEIGHT;
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}
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// proff 09/24/98: Added for high-res
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else if (setblocks == 10)
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{
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scaledviewwidth = SCREENWIDTH;
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viewheight = SCREENHEIGHT-ST_SCALED_HEIGHT;
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}
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else
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{
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// proff 08/17/98: Changed for high-res
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scaledviewwidth = setblocks*SCREENWIDTH/10;
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viewheight = (setblocks*(SCREENHEIGHT-ST_SCALED_HEIGHT)/10) & ~7;
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}
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viewwidth = scaledviewwidth;
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viewheightfrac = viewheight<<FRACBITS;//e6y
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centery = viewheight/2;
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centerx = viewwidth/2;
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centerxfrac = centerx<<FRACBITS;
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centeryfrac = centery<<FRACBITS;
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projection = centerxfrac;
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// proff 11/06/98: Added for high-res
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projectiony = ((SCREENHEIGHT * centerx * 320) / 200) / SCREENWIDTH * FRACUNIT;
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R_InitBuffer (scaledviewwidth, viewheight);
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R_InitTextureMapping();
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// psprite scales
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// proff 08/17/98: Changed for high-res
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pspritescale = FRACUNIT*viewwidth/320;
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pspriteiscale = FRACUNIT*320/viewwidth;
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// proff 11/06/98: Added for high-res
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pspriteyscale = (((SCREENHEIGHT*viewwidth)/SCREENWIDTH) << FRACBITS) / 200;
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// thing clipping
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for (i=0 ; i<viewwidth ; i++)
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screenheightarray[i] = viewheight;
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// planes
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for (i=0 ; i<viewheight ; i++)
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{ // killough 5/2/98: reformatted
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fixed_t dy = D_abs(((i-viewheight/2)<<FRACBITS)+FRACUNIT/2);
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// proff 08/17/98: Changed for high-res
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yslope[i] = FixedDiv(projectiony, dy);
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}
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for (i=0 ; i<viewwidth ; i++)
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{
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fixed_t cosadj = D_abs(finecosine[xtoviewangle[i]>>ANGLETOFINESHIFT]);
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distscale[i] = FixedDiv(FRACUNIT,cosadj);
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}
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}
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//
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// R_Init
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//
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extern int screenblocks;
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void R_Init (void)
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{
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// CPhipps - R_DrawColumn isn't constant anymore, so must
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// initialise in code
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// current column draw function
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lprintf(LO_INFO, "\nR_LoadTrigTables: ");
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R_LoadTrigTables();
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lprintf(LO_INFO, "\nR_InitData: ");
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R_InitData();
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R_SetViewSize(screenblocks);
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lprintf(LO_INFO, "\nR_Init: R_InitPlanes ");
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R_InitPlanes();
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lprintf(LO_INFO, "R_InitLightTables ");
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R_InitLightTables();
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lprintf(LO_INFO, "R_InitSkyMap ");
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R_InitSkyMap();
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lprintf(LO_INFO, "R_InitTranslationsTables ");
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R_InitTranslationTables();
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lprintf(LO_INFO, "R_InitPatches ");
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R_InitPatches();
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}
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//
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// R_PointInSubsector
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//
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// killough 5/2/98: reformatted, cleaned up
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subsector_t *R_PointInSubsector(fixed_t x, fixed_t y)
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{
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int nodenum = numnodes-1;
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// special case for trivial maps (single subsector, no nodes)
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if (numnodes == 0)
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return subsectors;
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while (!(nodenum & NF_SUBSECTOR))
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nodenum = nodes[nodenum].children[R_PointOnSide(x, y, nodes+nodenum)];
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return &subsectors[nodenum & ~NF_SUBSECTOR];
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}
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//
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// R_SetupFrame
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//
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static void R_SetupFrame (player_t *player, int eye)
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{
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int cm;
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boolean NoInterpolate = paused || (menuactive && !demoplayback);
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viewplayer = player;
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if (player->mo != oviewer || NoInterpolate)
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{
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R_ResetViewInterpolation ();
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oviewer = player->mo;
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}
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tic_vars.frac = I_GetTimeFrac ();
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if (NoInterpolate)
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tic_vars.frac = FRACUNIT;
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R_InterpolateView (player, tic_vars.frac, eye);
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extralight = player->extralight;
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viewsin = finesine[viewangle>>ANGLETOFINESHIFT];
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viewcos = finecosine[viewangle>>ANGLETOFINESHIFT];
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R_DoInterpolations(tic_vars.frac);
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// killough 3/20/98, 4/4/98: select colormap based on player status
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if (player->mo->subsector->sector->heightsec != -1)
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{
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const sector_t *s = player->mo->subsector->sector->heightsec + sectors;
|
|
cm = viewz < s->floorheight ? s->bottommap : viewz > s->ceilingheight ?
|
|
s->topmap : s->midmap;
|
|
if (cm < 0 || cm > numcolormaps)
|
|
cm = 0;
|
|
}
|
|
else
|
|
cm = 0;
|
|
|
|
fullcolormap = colormaps[cm];
|
|
zlight = c_zlight[cm];
|
|
|
|
if (player->fixedcolormap)
|
|
{
|
|
fixedcolormap = fullcolormap // killough 3/20/98: use fullcolormap
|
|
+ player->fixedcolormap*256*sizeof(lighttable_t);
|
|
}
|
|
else
|
|
fixedcolormap = 0;
|
|
|
|
validcount++;
|
|
}
|
|
|
|
int autodetect_hom = 0; // killough 2/7/98: HOM autodetection flag
|
|
|
|
//
|
|
// R_ShowStats
|
|
//
|
|
int rendered_visplanes, rendered_segs, rendered_vissprites;
|
|
boolean rendering_stats;
|
|
|
|
static void R_ShowStats(void)
|
|
{
|
|
//e6y
|
|
#if USE_SDL
|
|
static unsigned int FPS_SavedTick = 0, FPS_FrameCount = 0;
|
|
unsigned int tick = SDL_GetTicks();
|
|
FPS_FrameCount++;
|
|
if(tick >= FPS_SavedTick + 1000)
|
|
{
|
|
doom_printf((V_GetMode() == VID_MODEGL)
|
|
?"Frame rate %d fps\nWalls %d, Flats %d, Sprites %d"
|
|
:"Frame rate %d fps\nSegs %d, Visplanes %d, Sprites %d",
|
|
1000 * FPS_FrameCount / (tick - FPS_SavedTick), rendered_segs,
|
|
rendered_visplanes, rendered_vissprites);
|
|
FPS_SavedTick = tick;
|
|
FPS_FrameCount = 0;
|
|
}
|
|
#else
|
|
|
|
#define KEEPTIMES 10
|
|
static int keeptime[KEEPTIMES], showtime;
|
|
int now = I_GetTime();
|
|
|
|
if (now - showtime > 35) {
|
|
doom_printf((V_GetMode() == VID_MODEGL)
|
|
?"Frame rate %d fps\nWalls %d, Flats %d, Sprites %d"
|
|
:"Frame rate %d fps\nSegs %d, Visplanes %d, Sprites %d",
|
|
(35*KEEPTIMES)/(now - keeptime[0]), rendered_segs,
|
|
rendered_visplanes, rendered_vissprites);
|
|
showtime = now;
|
|
}
|
|
memmove(keeptime, keeptime+1, sizeof(keeptime[0]) * (KEEPTIMES-1));
|
|
keeptime[KEEPTIMES-1] = now;
|
|
|
|
#endif //e6y
|
|
}
|
|
|
|
//
|
|
// R_RenderView
|
|
//
|
|
void R_RenderPlayerView (player_t* player, int eye)
|
|
{
|
|
R_SetupFrame (player, eye);
|
|
|
|
// Clear buffers.
|
|
R_ClearClipSegs ();
|
|
R_ClearDrawSegs ();
|
|
R_ClearPlanes ();
|
|
R_ClearSprites ();
|
|
|
|
rendered_segs = rendered_visplanes = 0;
|
|
if (V_GetMode() == VID_MODEGL)
|
|
{
|
|
#ifdef GL_DOOM
|
|
// proff 11/99: clear buffers
|
|
gld_InitDrawScene(eye);
|
|
// proff 11/99: switch to perspective mode
|
|
gld_StartDrawScene();
|
|
#endif
|
|
} else {
|
|
if (autodetect_hom)
|
|
{ // killough 2/10/98: add flashing red HOM indicators
|
|
unsigned char color=(gametic % 20) < 9 ? 0xb0 : 0;
|
|
V_FillRect(0, viewwindowx, viewwindowy, viewwidth, viewheight, color);
|
|
R_DrawViewBorder();
|
|
}
|
|
}
|
|
|
|
// check for new console commands.
|
|
#ifdef HAVE_NET
|
|
NetUpdate ();
|
|
#endif
|
|
|
|
// The head node is the last node output.
|
|
R_RenderBSPNode (numnodes-1);
|
|
R_ResetColumnBuffer();
|
|
|
|
// Check for new console commands.
|
|
#ifdef HAVE_NET
|
|
NetUpdate ();
|
|
#endif
|
|
|
|
if (V_GetMode() != VID_MODEGL)
|
|
R_DrawPlanes (eye);
|
|
|
|
// Check for new console commands.
|
|
#ifdef HAVE_NET
|
|
NetUpdate ();
|
|
#endif
|
|
|
|
if (V_GetMode() != VID_MODEGL) {
|
|
R_DrawMasked ();
|
|
R_ResetColumnBuffer();
|
|
}
|
|
|
|
// Check for new console commands.
|
|
#ifdef HAVE_NET
|
|
NetUpdate ();
|
|
#endif
|
|
|
|
if (V_GetMode() == VID_MODEGL) {
|
|
#ifdef GL_DOOM
|
|
// proff 11/99: draw the scene
|
|
gld_DrawScene(player);
|
|
// proff 11/99: finishing off
|
|
gld_EndDrawScene();
|
|
#endif
|
|
}
|
|
|
|
if (rendering_stats) R_ShowStats();
|
|
|
|
R_RestoreInterpolations();
|
|
}
|