mirror of
https://git.do.srb2.org/STJr/UltimateZoneBuilder.git
synced 2024-11-24 04:41:10 +00:00
622 lines
15 KiB
C++
622 lines
15 KiB
C++
// Emacs style mode select -*- C++ -*-
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Copyright(C) 1993-1996 Id Software, Inc.
|
|
// Copyright(C) 2005 Simon Howard
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License
|
|
// as published by the Free Software Foundation; either version 2
|
|
// of the License, or (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
// 02111-1307, USA.
|
|
//
|
|
// DESCRIPTION:
|
|
// All the clipping: columns, horizontal spans, sky columns.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include "vpo_local.h"
|
|
|
|
namespace vpo
|
|
{
|
|
|
|
|
|
// OPTIMIZE: closed two sided lines as single sided
|
|
|
|
// True if any of the segs textures might be visible.
|
|
boolean segtextured;
|
|
|
|
// False if the back side is the same plane.
|
|
boolean markfloor;
|
|
boolean markceiling;
|
|
|
|
boolean maskedtexture;
|
|
int toptexture;
|
|
int bottomtexture;
|
|
int midtexture;
|
|
|
|
|
|
angle_t rw_normalangle;
|
|
// angle to line origin
|
|
int rw_angle1;
|
|
|
|
//
|
|
// regular wall
|
|
//
|
|
int rw_x;
|
|
int rw_stopx;
|
|
angle_t rw_centerangle;
|
|
fixed_t rw_offset;
|
|
fixed_t rw_distance;
|
|
fixed_t rw_scale;
|
|
fixed_t rw_scalestep;
|
|
fixed_t rw_midtexturemid;
|
|
fixed_t rw_toptexturemid;
|
|
fixed_t rw_bottomtexturemid;
|
|
|
|
int worldtop;
|
|
int worldbottom;
|
|
int worldhigh;
|
|
int worldlow;
|
|
|
|
fixed_t pixhigh;
|
|
fixed_t pixlow;
|
|
fixed_t pixhighstep;
|
|
fixed_t pixlowstep;
|
|
|
|
fixed_t topfrac;
|
|
fixed_t topstep;
|
|
|
|
fixed_t bottomfrac;
|
|
fixed_t bottomstep;
|
|
|
|
|
|
short* maskedtexturecol;
|
|
|
|
|
|
// R_DRAW bits
|
|
int dc_x;
|
|
int dc_yl;
|
|
int dc_yh;
|
|
fixed_t dc_iscale;
|
|
fixed_t dc_texturemid;
|
|
|
|
|
|
//
|
|
// R_RenderSegLoop
|
|
// Draws zero, one, or two textures (and possibly a masked
|
|
// texture) for walls.
|
|
// Can draw or mark the starting pixel of floor and ceiling
|
|
// textures.
|
|
// CALLED: CORE LOOPING ROUTINE.
|
|
//
|
|
#define HEIGHTBITS 12
|
|
#define HEIGHTUNIT (1<<HEIGHTBITS)
|
|
|
|
void R_RenderSegLoop (void)
|
|
{
|
|
angle_t angle;
|
|
int yl;
|
|
int yh;
|
|
int mid;
|
|
fixed_t texturecolumn;
|
|
int top;
|
|
int bottom;
|
|
|
|
for ( ; rw_x < rw_stopx ; rw_x++)
|
|
{
|
|
// mark floor / ceiling areas
|
|
yl = (topfrac+HEIGHTUNIT-1)>>HEIGHTBITS;
|
|
|
|
// no space above wall?
|
|
if (yl < ceilingclip[rw_x]+1)
|
|
yl = ceilingclip[rw_x]+1;
|
|
|
|
if (markceiling)
|
|
{
|
|
top = ceilingclip[rw_x]+1;
|
|
bottom = yl-1;
|
|
|
|
if (bottom >= floorclip[rw_x])
|
|
bottom = floorclip[rw_x]-1;
|
|
|
|
if (top <= bottom)
|
|
{
|
|
ceilingplane->top[rw_x] = top;
|
|
ceilingplane->bottom[rw_x] = bottom;
|
|
}
|
|
}
|
|
|
|
yh = bottomfrac>>HEIGHTBITS;
|
|
|
|
if (yh >= floorclip[rw_x])
|
|
yh = floorclip[rw_x]-1;
|
|
|
|
if (markfloor)
|
|
{
|
|
top = yh+1;
|
|
bottom = floorclip[rw_x]-1;
|
|
if (top <= ceilingclip[rw_x])
|
|
top = ceilingclip[rw_x]+1;
|
|
if (top <= bottom)
|
|
{
|
|
floorplane->top[rw_x] = top;
|
|
floorplane->bottom[rw_x] = bottom;
|
|
}
|
|
}
|
|
|
|
// texturecolumn and lighting are independent of wall tiers
|
|
if (segtextured)
|
|
{
|
|
// calculate texture offset
|
|
angle = (rw_centerangle + xtoviewangle[rw_x])>>ANGLETOFINESHIFT;
|
|
texturecolumn = rw_offset-FixedMul(finetangent[angle],rw_distance);
|
|
texturecolumn >>= FRACBITS;
|
|
|
|
dc_x = rw_x;
|
|
dc_iscale = 0xffffffffu / (unsigned)rw_scale;
|
|
}
|
|
else
|
|
{
|
|
// purely to shut up the compiler
|
|
|
|
texturecolumn = 0;
|
|
}
|
|
|
|
// draw the wall tiers
|
|
if (midtexture)
|
|
{
|
|
// single sided line
|
|
dc_yl = yl;
|
|
dc_yh = yh;
|
|
dc_texturemid = rw_midtexturemid;
|
|
///--- dc_source = R_GetColumn(midtexture,texturecolumn);
|
|
///--- colfunc ();
|
|
ceilingclip[rw_x] = viewheight;
|
|
floorclip[rw_x] = -1;
|
|
}
|
|
else
|
|
{
|
|
// two sided line
|
|
if (toptexture)
|
|
{
|
|
// top wall
|
|
mid = pixhigh>>HEIGHTBITS;
|
|
pixhigh += pixhighstep;
|
|
|
|
if (mid >= floorclip[rw_x])
|
|
mid = floorclip[rw_x]-1;
|
|
|
|
if (mid >= yl)
|
|
{
|
|
dc_yl = yl;
|
|
dc_yh = mid;
|
|
dc_texturemid = rw_toptexturemid;
|
|
///--- dc_source = R_GetColumn(toptexture,texturecolumn);
|
|
///--- colfunc ();
|
|
ceilingclip[rw_x] = mid;
|
|
}
|
|
else
|
|
ceilingclip[rw_x] = yl-1;
|
|
}
|
|
else
|
|
{
|
|
// no top wall
|
|
if (markceiling)
|
|
ceilingclip[rw_x] = yl-1;
|
|
}
|
|
|
|
if (bottomtexture)
|
|
{
|
|
// bottom wall
|
|
mid = (pixlow+HEIGHTUNIT-1)>>HEIGHTBITS;
|
|
pixlow += pixlowstep;
|
|
|
|
// no space above wall?
|
|
if (mid <= ceilingclip[rw_x])
|
|
mid = ceilingclip[rw_x]+1;
|
|
|
|
if (mid <= yh)
|
|
{
|
|
dc_yl = mid;
|
|
dc_yh = yh;
|
|
dc_texturemid = rw_bottomtexturemid;
|
|
///--- dc_source = R_GetColumn(bottomtexture, texturecolumn);
|
|
///--- colfunc ();
|
|
floorclip[rw_x] = mid;
|
|
}
|
|
else
|
|
floorclip[rw_x] = yh+1;
|
|
}
|
|
else
|
|
{
|
|
// no bottom wall
|
|
if (markfloor)
|
|
floorclip[rw_x] = yh+1;
|
|
}
|
|
|
|
if (maskedtexture)
|
|
{
|
|
// save texturecol
|
|
// for backdrawing of masked mid texture
|
|
maskedtexturecol[rw_x] = texturecolumn;
|
|
}
|
|
}
|
|
|
|
rw_scale += rw_scalestep;
|
|
topfrac += topstep;
|
|
bottomfrac += bottomstep;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
//
|
|
// R_StoreWallRange
|
|
// A wall segment will be drawn
|
|
// between start and stop pixels (inclusive).
|
|
//
|
|
void R_StoreWallRange ( int start, int stop )
|
|
{
|
|
fixed_t hyp;
|
|
fixed_t sineval;
|
|
angle_t distangle, offsetangle;
|
|
fixed_t vtop;
|
|
|
|
// don't overflow and crash
|
|
total_drawsegs++;
|
|
|
|
if (total_drawsegs >= MAXDRAWSEGS)
|
|
throw overflow_exception();
|
|
|
|
#ifdef RANGECHECK
|
|
if (start >=viewwidth || start > stop)
|
|
I_Error ("Bad R_RenderWallRange: %i to %i", start , stop);
|
|
#endif
|
|
|
|
sidedef = curline->sidedef;
|
|
linedef = curline->linedef;
|
|
|
|
// mark the segment as visible for auto map
|
|
linedef->flags |= ML_MAPPED;
|
|
|
|
// calculate rw_distance for scale calculation
|
|
rw_normalangle = curline->angle + ANG90;
|
|
offsetangle = abs((int)rw_normalangle-rw_angle1);
|
|
|
|
if (offsetangle > ANG90)
|
|
offsetangle = ANG90;
|
|
|
|
distangle = ANG90 - offsetangle;
|
|
hyp = R_PointToDist (curline->v1->x, curline->v1->y);
|
|
sineval = finesine[distangle>>ANGLETOFINESHIFT];
|
|
rw_distance = FixedMul (hyp, sineval);
|
|
|
|
|
|
ds_p->x1 = rw_x = start;
|
|
ds_p->x2 = stop;
|
|
ds_p->curline = curline;
|
|
rw_stopx = stop+1;
|
|
|
|
// calculate scale at both ends and step
|
|
ds_p->scale1 = rw_scale =
|
|
R_ScaleFromGlobalAngle (viewangle + xtoviewangle[start]);
|
|
|
|
if (stop > start )
|
|
{
|
|
ds_p->scale2 = R_ScaleFromGlobalAngle (viewangle + xtoviewangle[stop]);
|
|
ds_p->scalestep = rw_scalestep =
|
|
(ds_p->scale2 - rw_scale) / (stop-start);
|
|
}
|
|
else
|
|
{
|
|
ds_p->scale2 = ds_p->scale1;
|
|
}
|
|
|
|
// calculate texture boundaries
|
|
// and decide if floor / ceiling marks are needed
|
|
worldtop = frontsector->ceilingheight - viewz;
|
|
worldbottom = frontsector->floorheight - viewz;
|
|
|
|
midtexture = toptexture = bottomtexture = maskedtexture = 0;
|
|
ds_p->maskedtexturecol = NULL;
|
|
|
|
if (!backsector)
|
|
{
|
|
// single sided line
|
|
midtexture = sidedef->midtexture;
|
|
// a single sided line is terminal, so it must mark ends
|
|
markfloor = markceiling = true;
|
|
if (linedef->flags & ML_DONTPEGBOTTOM)
|
|
{
|
|
vtop = frontsector->floorheight
|
|
+ 128; ///??? textureheight[sidedef->midtexture];
|
|
// bottom of texture at bottom
|
|
rw_midtexturemid = vtop - viewz;
|
|
}
|
|
else
|
|
{
|
|
// top of texture at top
|
|
rw_midtexturemid = worldtop;
|
|
}
|
|
rw_midtexturemid += sidedef->rowoffset;
|
|
|
|
ds_p->silhouette = SIL_BOTH;
|
|
ds_p->sprtopclip = screenheightarray;
|
|
ds_p->sprbottomclip = negonearray;
|
|
ds_p->bsilheight = INT_MAX;
|
|
ds_p->tsilheight = INT_MIN;
|
|
}
|
|
else
|
|
{
|
|
// two sided line
|
|
ds_p->sprtopclip = ds_p->sprbottomclip = NULL;
|
|
ds_p->silhouette = 0;
|
|
|
|
if (frontsector->floorheight > backsector->floorheight)
|
|
{
|
|
ds_p->silhouette = SIL_BOTTOM;
|
|
ds_p->bsilheight = frontsector->floorheight;
|
|
}
|
|
else if (backsector->floorheight > viewz)
|
|
{
|
|
ds_p->silhouette = SIL_BOTTOM;
|
|
ds_p->bsilheight = INT_MAX;
|
|
// ds_p->sprbottomclip = negonearray;
|
|
}
|
|
|
|
if (frontsector->ceilingheight < backsector->ceilingheight)
|
|
{
|
|
ds_p->silhouette |= SIL_TOP;
|
|
ds_p->tsilheight = frontsector->ceilingheight;
|
|
}
|
|
else if (backsector->ceilingheight < viewz)
|
|
{
|
|
ds_p->silhouette |= SIL_TOP;
|
|
ds_p->tsilheight = INT_MIN;
|
|
// ds_p->sprtopclip = screenheightarray;
|
|
}
|
|
|
|
if (backsector->ceilingheight <= frontsector->floorheight)
|
|
{
|
|
ds_p->sprbottomclip = negonearray;
|
|
ds_p->bsilheight = INT_MAX;
|
|
ds_p->silhouette |= SIL_BOTTOM;
|
|
}
|
|
|
|
if (backsector->floorheight >= frontsector->ceilingheight)
|
|
{
|
|
ds_p->sprtopclip = screenheightarray;
|
|
ds_p->tsilheight = INT_MIN;
|
|
ds_p->silhouette |= SIL_TOP;
|
|
}
|
|
|
|
worldhigh = backsector->ceilingheight - viewz;
|
|
worldlow = backsector->floorheight - viewz;
|
|
|
|
// hack to allow height changes in outdoor areas
|
|
if (frontsector->ceilingpic == skyflatnum
|
|
&& backsector->ceilingpic == skyflatnum)
|
|
{
|
|
worldtop = worldhigh;
|
|
}
|
|
|
|
|
|
if (worldlow != worldbottom
|
|
|| backsector->floorpic != frontsector->floorpic
|
|
|| backsector->lightlevel != frontsector->lightlevel)
|
|
{
|
|
markfloor = true;
|
|
}
|
|
else
|
|
{
|
|
// same plane on both sides
|
|
markfloor = false;
|
|
}
|
|
|
|
|
|
if (worldhigh != worldtop
|
|
|| backsector->ceilingpic != frontsector->ceilingpic
|
|
|| backsector->lightlevel != frontsector->lightlevel)
|
|
{
|
|
markceiling = true;
|
|
}
|
|
else
|
|
{
|
|
// same plane on both sides
|
|
markceiling = false;
|
|
}
|
|
|
|
if (backsector->ceilingheight <= frontsector->floorheight
|
|
|| backsector->floorheight >= frontsector->ceilingheight)
|
|
{
|
|
// closed door
|
|
markceiling = markfloor = true;
|
|
}
|
|
|
|
|
|
if (worldhigh < worldtop)
|
|
{
|
|
// top texture
|
|
toptexture = sidedef->toptexture;
|
|
if (linedef->flags & ML_DONTPEGTOP)
|
|
{
|
|
// top of texture at top
|
|
rw_toptexturemid = worldtop;
|
|
}
|
|
else
|
|
{
|
|
vtop = backsector->ceilingheight
|
|
+ 128; ///??? textureheight[sidedef->toptexture];
|
|
|
|
// bottom of texture
|
|
rw_toptexturemid = vtop - viewz;
|
|
}
|
|
}
|
|
if (worldlow > worldbottom)
|
|
{
|
|
// bottom texture
|
|
bottomtexture = 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;
|
|
total_openings += (rw_stopx - rw_x);
|
|
|
|
if (total_openings >= MAXOPENINGS)
|
|
throw overflow_exception();
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
|
|
// andrewj: make sure floorplane/ceilingplane are not NULL (prevent a crash)
|
|
if (! floorplane) markfloor = false;
|
|
if (! ceilingplane) markceiling = false;
|
|
|
|
// 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;
|
|
total_openings += (rw_stopx - start);
|
|
|
|
if (total_openings >= MAXOPENINGS)
|
|
throw overflow_exception();
|
|
}
|
|
|
|
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;
|
|
total_openings += (rw_stopx - start);
|
|
|
|
if (total_openings >= MAXOPENINGS)
|
|
throw overflow_exception();
|
|
}
|
|
|
|
if (maskedtexture && !(ds_p->silhouette&SIL_TOP))
|
|
{
|
|
ds_p->silhouette |= SIL_TOP;
|
|
ds_p->tsilheight = INT_MIN;
|
|
}
|
|
if (maskedtexture && !(ds_p->silhouette&SIL_BOTTOM))
|
|
{
|
|
ds_p->silhouette |= SIL_BOTTOM;
|
|
ds_p->bsilheight = INT_MAX;
|
|
}
|
|
ds_p++;
|
|
}
|
|
|
|
|
|
} // namespace vpo
|
|
|