747 lines
17 KiB
C
747 lines
17 KiB
C
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source 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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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// All the clipping: columns, horizontal spans, sky columns.
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//
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//-----------------------------------------------------------------------------
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static const char
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rcsid[] = "$Id: r_segs.c,v 1.3 1997/01/29 20:10:19 b1 Exp $";
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#include <stdlib.h>
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#include "i_system.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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// OPTIMIZE: closed two sided lines as single sided
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// True if any of the segs textures might be visible.
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boolean segtextured;
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// False if the back side is the same plane.
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boolean markfloor;
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boolean markceiling;
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boolean maskedtexture;
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int toptexture;
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int bottomtexture;
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int midtexture;
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angle_t rw_normalangle;
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// angle to line origin
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int rw_angle1;
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//
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// regular wall
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//
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int rw_x;
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int rw_stopx;
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angle_t rw_centerangle;
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fixed_t rw_offset;
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fixed_t rw_distance;
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fixed_t rw_scale;
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fixed_t rw_scalestep;
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fixed_t rw_midtexturemid;
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fixed_t rw_toptexturemid;
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fixed_t rw_bottomtexturemid;
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int worldtop;
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int worldbottom;
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int worldhigh;
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int worldlow;
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fixed_t pixhigh;
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fixed_t pixlow;
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fixed_t pixhighstep;
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fixed_t pixlowstep;
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fixed_t topfrac;
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fixed_t topstep;
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fixed_t bottomfrac;
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fixed_t bottomstep;
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lighttable_t** walllights;
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short* maskedtexturecol;
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//
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// R_RenderMaskedSegRange
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//
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void
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R_RenderMaskedSegRange
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( drawseg_t* ds,
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int x1,
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int x2 )
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{
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unsigned index;
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column_t* col;
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int lightnum;
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int texnum;
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// Calculate light table.
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// Use different light tables
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// for horizontal / vertical / diagonal. Diagonal?
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// OPTIMIZE: get rid of LIGHTSEGSHIFT globally
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curline = ds->curline;
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frontsector = curline->frontsector;
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backsector = curline->backsector;
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texnum = texturetranslation[curline->sidedef->midtexture];
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lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT)+extralight;
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if (curline->v1->y == curline->v2->y)
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lightnum--;
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else if (curline->v1->x == curline->v2->x)
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lightnum++;
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if (lightnum < 0)
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walllights = scalelight[0];
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else if (lightnum >= LIGHTLEVELS)
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walllights = scalelight[LIGHTLEVELS-1];
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else
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walllights = scalelight[lightnum];
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maskedtexturecol = ds->maskedtexturecol;
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rw_scalestep = ds->scalestep;
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spryscale = ds->scale1 + (x1 - ds->x1)*rw_scalestep;
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mfloorclip = ds->sprbottomclip;
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mceilingclip = ds->sprtopclip;
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// find positioning
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if (curline->linedef->flags & ML_DONTPEGBOTTOM)
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{
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dc_texturemid = frontsector->floorheight > backsector->floorheight
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? frontsector->floorheight : backsector->floorheight;
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dc_texturemid = dc_texturemid + textureheight[texnum] - viewz;
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}
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else
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{
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dc_texturemid =frontsector->ceilingheight<backsector->ceilingheight
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? frontsector->ceilingheight : backsector->ceilingheight;
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dc_texturemid = dc_texturemid - viewz;
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}
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dc_texturemid += curline->sidedef->rowoffset;
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if (fixedcolormap)
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dc_colormap = fixedcolormap;
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// draw the columns
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for (dc_x = x1 ; dc_x <= x2 ; dc_x++)
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{
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// calculate lighting
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if (maskedtexturecol[dc_x] != MAXSHORT)
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{
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if (!fixedcolormap)
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{
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index = spryscale>>LIGHTSCALESHIFT;
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if (index >= MAXLIGHTSCALE )
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index = MAXLIGHTSCALE-1;
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dc_colormap = walllights[index];
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}
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sprtopscreen = centeryfrac - FixedMul(dc_texturemid, spryscale);
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dc_iscale = 0xffffffffu / (unsigned)spryscale;
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// draw the texture
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col = (column_t *)(
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(byte *)R_GetColumn(texnum,maskedtexturecol[dc_x]) -3);
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R_DrawMaskedColumn (col);
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maskedtexturecol[dc_x] = MAXSHORT;
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}
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spryscale += rw_scalestep;
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}
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}
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//
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// R_RenderSegLoop
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// Draws zero, one, or two textures (and possibly a masked
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// texture) for walls.
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// Can draw or mark the starting pixel of floor and ceiling
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// textures.
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// CALLED: CORE LOOPING ROUTINE.
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//
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#define HEIGHTBITS 12
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#define HEIGHTUNIT (1<<HEIGHTBITS)
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void R_RenderSegLoop (void)
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{
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angle_t angle;
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unsigned index;
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int yl;
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int yh;
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int mid;
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fixed_t texturecolumn;
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int top;
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int bottom;
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//texturecolumn = 0; // shut up compiler warning
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for ( ; rw_x < rw_stopx ; rw_x++)
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{
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// mark floor / ceiling areas
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yl = (topfrac+HEIGHTUNIT-1)>>HEIGHTBITS;
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// no space above wall?
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if (yl < ceilingclip[rw_x]+1)
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yl = ceilingclip[rw_x]+1;
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if (markceiling)
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{
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top = ceilingclip[rw_x]+1;
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bottom = yl-1;
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if (bottom >= floorclip[rw_x])
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bottom = floorclip[rw_x]-1;
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if (top <= bottom)
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{
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ceilingplane->top[rw_x] = top;
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ceilingplane->bottom[rw_x] = bottom;
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}
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}
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yh = bottomfrac>>HEIGHTBITS;
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if (yh >= floorclip[rw_x])
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yh = floorclip[rw_x]-1;
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if (markfloor)
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{
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top = yh+1;
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bottom = floorclip[rw_x]-1;
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if (top <= ceilingclip[rw_x])
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top = ceilingclip[rw_x]+1;
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if (top <= bottom)
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{
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floorplane->top[rw_x] = top;
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floorplane->bottom[rw_x] = bottom;
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}
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}
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// texturecolumn and lighting are independent of wall tiers
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if (segtextured)
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{
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// calculate texture offset
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angle = (rw_centerangle + xtoviewangle[rw_x])>>ANGLETOFINESHIFT;
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texturecolumn = rw_offset-FixedMul(finetangent[angle],rw_distance);
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texturecolumn >>= FRACBITS;
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// calculate lighting
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index = rw_scale>>LIGHTSCALESHIFT;
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if (index >= MAXLIGHTSCALE )
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index = MAXLIGHTSCALE-1;
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dc_colormap = walllights[index];
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dc_x = rw_x;
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dc_iscale = 0xffffffffu / (unsigned)rw_scale;
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}
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// draw the wall tiers
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if (midtexture)
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{
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// single sided line
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dc_yl = yl;
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dc_yh = yh;
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dc_texturemid = rw_midtexturemid;
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dc_source = R_GetColumn(midtexture,texturecolumn);
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colfunc ();
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ceilingclip[rw_x] = viewheight;
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floorclip[rw_x] = -1;
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}
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else
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{
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// two sided line
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if (toptexture)
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{
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// top wall
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mid = pixhigh>>HEIGHTBITS;
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pixhigh += pixhighstep;
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if (mid >= floorclip[rw_x])
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mid = floorclip[rw_x]-1;
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if (mid >= yl)
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{
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dc_yl = yl;
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dc_yh = mid;
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dc_texturemid = rw_toptexturemid;
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dc_source = R_GetColumn(toptexture,texturecolumn);
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colfunc ();
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ceilingclip[rw_x] = mid;
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}
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else
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ceilingclip[rw_x] = yl-1;
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}
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else
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{
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// no top wall
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if (markceiling)
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ceilingclip[rw_x] = yl-1;
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}
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if (bottomtexture)
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{
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// bottom wall
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mid = (pixlow+HEIGHTUNIT-1)>>HEIGHTBITS;
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pixlow += pixlowstep;
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// no space above wall?
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if (mid <= ceilingclip[rw_x])
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mid = ceilingclip[rw_x]+1;
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if (mid <= yh)
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{
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dc_yl = mid;
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dc_yh = yh;
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dc_texturemid = rw_bottomtexturemid;
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dc_source = R_GetColumn(bottomtexture,
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texturecolumn);
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colfunc ();
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floorclip[rw_x] = mid;
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}
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else
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floorclip[rw_x] = yh+1;
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}
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else
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{
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// no bottom wall
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if (markfloor)
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floorclip[rw_x] = yh+1;
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}
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if (maskedtexture)
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{
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// save texturecol
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// for backdrawing of masked mid texture
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maskedtexturecol[rw_x] = texturecolumn;
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}
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}
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rw_scale += rw_scalestep;
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topfrac += topstep;
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bottomfrac += bottomstep;
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}
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}
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//
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// R_StoreWallRange
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// A wall segment will be drawn
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// between start and stop pixels (inclusive).
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//
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void
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R_StoreWallRange
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( int start,
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int stop )
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{
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fixed_t hyp;
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fixed_t sineval;
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angle_t distangle, offsetangle;
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fixed_t vtop;
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int lightnum;
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// don't overflow and crash
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if (ds_p == &drawsegs[MAXDRAWSEGS])
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return;
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#ifdef RANGECHECK
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if (start >=viewwidth || start > stop)
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I_Error ("Bad R_RenderWallRange: %i to %i", start , stop);
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#endif
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sidedef = curline->sidedef;
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linedef = curline->linedef;
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// mark the segment as visible for auto map
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linedef->flags |= ML_MAPPED;
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// calculate rw_distance for scale calculation
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rw_normalangle = curline->angle + ANG90;
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offsetangle = abs(rw_normalangle-rw_angle1);
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if (offsetangle > ANG90)
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offsetangle = ANG90;
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distangle = ANG90 - offsetangle;
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hyp = R_PointToDist (curline->v1->x, curline->v1->y);
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sineval = finesine[distangle>>ANGLETOFINESHIFT];
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rw_distance = FixedMul (hyp, sineval);
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ds_p->x1 = rw_x = start;
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ds_p->x2 = stop;
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ds_p->curline = curline;
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rw_stopx = stop+1;
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// calculate scale at both ends and step
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ds_p->scale1 = rw_scale =
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R_ScaleFromGlobalAngle (viewangle + xtoviewangle[start]);
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if (stop > start )
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{
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ds_p->scale2 = R_ScaleFromGlobalAngle (viewangle + xtoviewangle[stop]);
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ds_p->scalestep = rw_scalestep =
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(ds_p->scale2 - rw_scale) / (stop-start);
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}
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else
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{
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// UNUSED: try to fix the stretched line bug
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#if 0
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if (rw_distance < FRACUNIT/2)
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{
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fixed_t trx,try;
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fixed_t gxt,gyt;
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trx = curline->v1->x - viewx;
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try = curline->v1->y - viewy;
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gxt = FixedMul(trx,viewcos);
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gyt = -FixedMul(try,viewsin);
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ds_p->scale1 = FixedDiv(projection, gxt-gyt)<<detailshift;
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}
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#endif
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ds_p->scale2 = ds_p->scale1;
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}
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// calculate texture boundaries
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// and decide if floor / ceiling marks are needed
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worldtop = frontsector->ceilingheight - viewz;
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worldbottom = frontsector->floorheight - viewz;
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midtexture = toptexture = bottomtexture = maskedtexture = 0;
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ds_p->maskedtexturecol = NULL;
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if (!backsector)
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{
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// single sided line
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midtexture = texturetranslation[sidedef->midtexture];
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// a single sided line is terminal, so it must mark ends
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markfloor = markceiling = true;
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if (linedef->flags & ML_DONTPEGBOTTOM)
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{
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vtop = frontsector->floorheight +
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textureheight[sidedef->midtexture];
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// bottom of texture at bottom
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rw_midtexturemid = vtop - viewz;
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}
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else
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{
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// top of texture at top
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rw_midtexturemid = worldtop;
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}
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rw_midtexturemid += sidedef->rowoffset;
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ds_p->silhouette = SIL_BOTH;
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ds_p->sprtopclip = screenheightarray;
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ds_p->sprbottomclip = negonearray;
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ds_p->bsilheight = MAXINT;
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ds_p->tsilheight = MININT;
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}
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else
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{
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// two sided line
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ds_p->sprtopclip = ds_p->sprbottomclip = NULL;
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ds_p->silhouette = 0;
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if (frontsector->floorheight > backsector->floorheight)
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{
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ds_p->silhouette = SIL_BOTTOM;
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ds_p->bsilheight = frontsector->floorheight;
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}
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else if (backsector->floorheight > viewz)
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{
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ds_p->silhouette = SIL_BOTTOM;
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ds_p->bsilheight = MAXINT;
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// ds_p->sprbottomclip = negonearray;
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}
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if (frontsector->ceilingheight < backsector->ceilingheight)
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{
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ds_p->silhouette |= SIL_TOP;
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ds_p->tsilheight = frontsector->ceilingheight;
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}
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else if (backsector->ceilingheight < viewz)
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{
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ds_p->silhouette |= SIL_TOP;
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ds_p->tsilheight = MININT;
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// ds_p->sprtopclip = screenheightarray;
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}
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if (backsector->ceilingheight <= frontsector->floorheight)
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{
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ds_p->sprbottomclip = negonearray;
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ds_p->bsilheight = MAXINT;
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ds_p->silhouette |= SIL_BOTTOM;
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}
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if (backsector->floorheight >= frontsector->ceilingheight)
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{
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ds_p->sprtopclip = screenheightarray;
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ds_p->tsilheight = MININT;
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ds_p->silhouette |= SIL_TOP;
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}
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worldhigh = backsector->ceilingheight - viewz;
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worldlow = backsector->floorheight - viewz;
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// hack to allow height changes in outdoor areas
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if (frontsector->ceilingpic == skyflatnum
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&& backsector->ceilingpic == skyflatnum)
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{
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worldtop = worldhigh;
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}
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if (worldlow != worldbottom
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|| backsector->floorpic != frontsector->floorpic
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|| backsector->lightlevel != frontsector->lightlevel)
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{
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markfloor = true;
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}
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else
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{
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// same plane on both sides
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markfloor = false;
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}
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if (worldhigh != worldtop
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|| backsector->ceilingpic != frontsector->ceilingpic
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|| backsector->lightlevel != frontsector->lightlevel)
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{
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markceiling = true;
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}
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else
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{
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// same plane on both sides
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markceiling = false;
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}
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if (backsector->ceilingheight <= frontsector->floorheight
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|| backsector->floorheight >= frontsector->ceilingheight)
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{
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// closed door
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markceiling = markfloor = true;
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}
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if (worldhigh < worldtop)
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{
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// top texture
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toptexture = texturetranslation[sidedef->toptexture];
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if (linedef->flags & ML_DONTPEGTOP)
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{
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// top of texture at top
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rw_toptexturemid = worldtop;
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}
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else
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{
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vtop =
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backsector->ceilingheight
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+ textureheight[sidedef->toptexture];
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// bottom of texture
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rw_toptexturemid = vtop - viewz;
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}
|
|
}
|
|
if (worldlow > worldbottom)
|
|
{
|
|
// bottom texture
|
|
bottomtexture = texturetranslation[sidedef->bottomtexture];
|
|
|
|
if (linedef->flags & ML_DONTPEGBOTTOM )
|
|
{
|
|
// bottom of texture at bottom
|
|
// top of texture at top
|
|
rw_bottomtexturemid = worldtop;
|
|
}
|
|
else // top of texture at top
|
|
rw_bottomtexturemid = worldlow;
|
|
}
|
|
rw_toptexturemid += sidedef->rowoffset;
|
|
rw_bottomtexturemid += sidedef->rowoffset;
|
|
|
|
// allocate space for masked texture tables
|
|
if (sidedef->midtexture)
|
|
{
|
|
// masked midtexture
|
|
maskedtexture = true;
|
|
ds_p->maskedtexturecol = maskedtexturecol = lastopening - rw_x;
|
|
lastopening += rw_stopx - rw_x;
|
|
}
|
|
}
|
|
|
|
// calculate rw_offset (only needed for textured lines)
|
|
segtextured = midtexture | toptexture | bottomtexture | maskedtexture;
|
|
|
|
if (segtextured)
|
|
{
|
|
offsetangle = rw_normalangle-rw_angle1;
|
|
|
|
if (offsetangle > ANG180)
|
|
offsetangle = -offsetangle;
|
|
|
|
if (offsetangle > ANG90)
|
|
offsetangle = ANG90;
|
|
|
|
sineval = finesine[offsetangle >>ANGLETOFINESHIFT];
|
|
rw_offset = FixedMul (hyp, sineval);
|
|
|
|
if (rw_normalangle-rw_angle1 < ANG180)
|
|
rw_offset = -rw_offset;
|
|
|
|
rw_offset += sidedef->textureoffset + curline->offset;
|
|
rw_centerangle = ANG90 + viewangle - rw_normalangle;
|
|
|
|
// calculate light table
|
|
// use different light tables
|
|
// for horizontal / vertical / diagonal
|
|
// OPTIMIZE: get rid of LIGHTSEGSHIFT globally
|
|
if (!fixedcolormap)
|
|
{
|
|
lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT)+extralight;
|
|
|
|
if (curline->v1->y == curline->v2->y)
|
|
lightnum--;
|
|
else if (curline->v1->x == curline->v2->x)
|
|
lightnum++;
|
|
|
|
if (lightnum < 0)
|
|
walllights = scalelight[0];
|
|
else if (lightnum >= LIGHTLEVELS)
|
|
walllights = scalelight[LIGHTLEVELS-1];
|
|
else
|
|
walllights = scalelight[lightnum];
|
|
}
|
|
}
|
|
|
|
// if a floor / ceiling plane is on the wrong side
|
|
// of the view plane, it is definitely invisible
|
|
// and doesn't need to be marked.
|
|
|
|
|
|
if (frontsector->floorheight >= viewz)
|
|
{
|
|
// above view plane
|
|
markfloor = false;
|
|
}
|
|
|
|
if (frontsector->ceilingheight <= viewz
|
|
&& frontsector->ceilingpic != skyflatnum)
|
|
{
|
|
// below view plane
|
|
markceiling = false;
|
|
}
|
|
|
|
|
|
// calculate incremental stepping values for texture edges
|
|
worldtop >>= 4;
|
|
worldbottom >>= 4;
|
|
|
|
topstep = -FixedMul (rw_scalestep, worldtop);
|
|
topfrac = (centeryfrac>>4) - FixedMul (worldtop, rw_scale);
|
|
|
|
bottomstep = -FixedMul (rw_scalestep,worldbottom);
|
|
bottomfrac = (centeryfrac>>4) - FixedMul (worldbottom, rw_scale);
|
|
|
|
if (backsector)
|
|
{
|
|
worldhigh >>= 4;
|
|
worldlow >>= 4;
|
|
|
|
if (worldhigh < worldtop)
|
|
{
|
|
pixhigh = (centeryfrac>>4) - FixedMul (worldhigh, rw_scale);
|
|
pixhighstep = -FixedMul (rw_scalestep,worldhigh);
|
|
}
|
|
|
|
if (worldlow > worldbottom)
|
|
{
|
|
pixlow = (centeryfrac>>4) - FixedMul (worldlow, rw_scale);
|
|
pixlowstep = -FixedMul (rw_scalestep,worldlow);
|
|
}
|
|
}
|
|
|
|
// render it
|
|
if (markceiling)
|
|
ceilingplane = R_CheckPlane (ceilingplane, rw_x, rw_stopx-1);
|
|
|
|
if (markfloor)
|
|
floorplane = R_CheckPlane (floorplane, rw_x, rw_stopx-1);
|
|
|
|
R_RenderSegLoop ();
|
|
|
|
|
|
// save sprite clipping info
|
|
if ( ((ds_p->silhouette & SIL_TOP) || maskedtexture)
|
|
&& !ds_p->sprtopclip)
|
|
{
|
|
memcpy (lastopening, ceilingclip+start, 2*(rw_stopx-start));
|
|
ds_p->sprtopclip = lastopening - start;
|
|
lastopening += rw_stopx - start;
|
|
}
|
|
|
|
if ( ((ds_p->silhouette & SIL_BOTTOM) || maskedtexture)
|
|
&& !ds_p->sprbottomclip)
|
|
{
|
|
memcpy (lastopening, floorclip+start, 2*(rw_stopx-start));
|
|
ds_p->sprbottomclip = lastopening - start;
|
|
lastopening += rw_stopx - start;
|
|
}
|
|
|
|
if (maskedtexture && !(ds_p->silhouette&SIL_TOP))
|
|
{
|
|
ds_p->silhouette |= SIL_TOP;
|
|
ds_p->tsilheight = MININT;
|
|
}
|
|
if (maskedtexture && !(ds_p->silhouette&SIL_BOTTOM))
|
|
{
|
|
ds_p->silhouette |= SIL_BOTTOM;
|
|
ds_p->bsilheight = MAXINT;
|
|
}
|
|
ds_p++;
|
|
}
|
|
|