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quakeforge/libs/video/renderer/sw32/d_polyse.c
Bill Currie 72fb96245f Cleanup global symbols for the sw and sw32 renderers. 
Names not mangled, but those symbols that could be made static have been.
Also, many dead variables have been removed.
2012-02-18 14:34:14 +09:00

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/*
d_polyse.c
routines for drawing sets of polygons sharing the same texture
(used for Alias models)
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#include "QF/sys.h"
#include "d_local.h"
#include "r_local.h"
static int ubasestep, errorterm, erroradjustup, erroradjustdown;
// TODO: put in span spilling to shrink list size
// !!! if this is changed, it must be changed in d_polysa.s too !!!
#define DPS_MAXSPANS MAXHEIGHT+1 // +1 for spanpackage marking end
// !!! if this is changed, it must be changed in asm_draw.h too !!!
typedef struct {
int pdest;
short *pz;
int count;
byte *ptex;
int sfrac, tfrac, light, zi;
} spanpackage_t;
typedef struct {
int isflattop;
int numleftedges;
int *pleftedgevert0;
int *pleftedgevert1;
int *pleftedgevert2;
int numrightedges;
int *prightedgevert0;
int *prightedgevert1;
int *prightedgevert2;
} edgetable;
static int r_p0[6], r_p1[6], r_p2[6];
static int d_xdenom;
static edgetable *pedgetable;
static edgetable edgetables[12] = {
{0, 1, r_p0, r_p2, NULL, 2, r_p0, r_p1, r_p2},
{0, 2, r_p1, r_p0, r_p2, 1, r_p1, r_p2, NULL},
{1, 1, r_p0, r_p2, NULL, 1, r_p1, r_p2, NULL},
{0, 1, r_p1, r_p0, NULL, 2, r_p1, r_p2, r_p0},
{0, 2, r_p0, r_p2, r_p1, 1, r_p0, r_p1, NULL},
{0, 1, r_p2, r_p1, NULL, 1, r_p2, r_p0, NULL},
{0, 1, r_p2, r_p1, NULL, 2, r_p2, r_p0, r_p1},
{0, 2, r_p2, r_p1, r_p0, 1, r_p2, r_p0, NULL},
{0, 1, r_p1, r_p0, NULL, 1, r_p1, r_p2, NULL},
{1, 1, r_p2, r_p1, NULL, 1, r_p0, r_p1, NULL},
{1, 1, r_p1, r_p0, NULL, 1, r_p2, r_p0, NULL},
{0, 1, r_p0, r_p2, NULL, 1, r_p0, r_p1, NULL},
};
static int r_sstepx, r_tstepx, r_lstepx, r_lstepy, r_sstepy, r_tstepy;
static int r_zistepx, r_zistepy;
static int d_aspancount, d_countextrastep;
static spanpackage_t *a_spans;
static spanpackage_t *d_pedgespanpackage;
static int ystart;
static int d_pdest;
static byte *d_ptex;
static short *d_pz;
static int d_sfrac, d_tfrac, d_light, d_zi;
static int d_ptexextrastep, d_sfracextrastep;
static int d_tfracextrastep, d_lightextrastep, d_pdestextrastep;
static int d_lightbasestep, d_pdestbasestep, d_ptexbasestep;
static int d_sfracbasestep, d_tfracbasestep;
static int d_ziextrastep, d_zibasestep;
static int d_pzextrastep, d_pzbasestep;
typedef struct {
int quotient;
int remainder;
} adivtab_t;
static adivtab_t adivtab[32 * 32] = {
#include "adivtab.h"
};
void
D_PolysetSetEdgeTable (void)
{
int edgetableindex;
// assume the vertices are already in top to bottom order
edgetableindex = 0;
// determine which edges are right & left, and the order in which
// to rasterize them
if (r_p0[1] >= r_p1[1]) {
if (r_p0[1] == r_p1[1]) {
if (r_p0[1] < r_p2[1])
pedgetable = &edgetables[2];
else
pedgetable = &edgetables[5];
return;
} else {
edgetableindex = 1;
}
}
if (r_p0[1] == r_p2[1]) {
if (edgetableindex)
pedgetable = &edgetables[8];
else
pedgetable = &edgetables[9];
return;
} else if (r_p1[1] == r_p2[1]) {
if (edgetableindex)
pedgetable = &edgetables[10];
else
pedgetable = &edgetables[11];
return;
}
if (r_p0[1] > r_p2[1])
edgetableindex += 2;
if (r_p1[1] > r_p2[1])
edgetableindex += 4;
pedgetable = &edgetables[edgetableindex];
}
static void
D_DrawNonSubdiv (void)
{
mtriangle_t *ptri;
finalvert_t *pfv, *index0, *index1, *index2;
int i;
int lnumtriangles;
pfv = r_affinetridesc.pfinalverts;
ptri = r_affinetridesc.ptriangles;
lnumtriangles = r_affinetridesc.numtriangles;
for (i = 0; i < lnumtriangles; i++, ptri++) {
index0 = pfv + ptri->vertindex[0];
index1 = pfv + ptri->vertindex[1];
index2 = pfv + ptri->vertindex[2];
d_xdenom =
(index0->v[1] - index1->v[1]) * (index0->v[0] - index2->v[0]) -
(index0->v[0] - index1->v[0]) * (index0->v[1] - index2->v[1]);
if (d_xdenom >= 0)
continue;
r_p0[0] = index0->v[0]; // u
r_p0[1] = index0->v[1]; // v
r_p0[2] = index0->v[2]; // s
r_p0[3] = index0->v[3]; // t
r_p0[4] = index0->v[4]; // light
r_p0[5] = index0->v[5]; // iz
r_p1[0] = index1->v[0];
r_p1[1] = index1->v[1];
r_p1[2] = index1->v[2];
r_p1[3] = index1->v[3];
r_p1[4] = index1->v[4];
r_p1[5] = index1->v[5];
r_p2[0] = index2->v[0];
r_p2[1] = index2->v[1];
r_p2[2] = index2->v[2];
r_p2[3] = index2->v[3];
r_p2[4] = index2->v[4];
r_p2[5] = index2->v[5];
if (!ptri->facesfront) {
if (index0->flags & ALIAS_ONSEAM)
r_p0[2] += r_affinetridesc.seamfixupX16;
if (index1->flags & ALIAS_ONSEAM)
r_p1[2] += r_affinetridesc.seamfixupX16;
if (index2->flags & ALIAS_ONSEAM)
r_p2[2] += r_affinetridesc.seamfixupX16;
}
D_PolysetSetEdgeTable ();
D_RasterizeAliasPolySmooth ();
}
}
void
D_PolysetDraw (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
((CACHE_SIZE - 1) / sizeof (spanpackage_t)) + 1];
// one extra because of cache line pretouching
a_spans = (spanpackage_t *)
(((intptr_t) &spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
D_DrawNonSubdiv ();
}
void
D_PolysetScanLeftEdge (int height)
{
do {
d_pedgespanpackage->pdest = d_pdest;
d_pedgespanpackage->pz = d_pz;
d_pedgespanpackage->count = d_aspancount;
d_pedgespanpackage->ptex = d_ptex;
d_pedgespanpackage->sfrac = d_sfrac;
d_pedgespanpackage->tfrac = d_tfrac;
// FIXME: need to clamp l, s, t, at both ends?
d_pedgespanpackage->light = d_light;
d_pedgespanpackage->zi = d_zi;
d_pedgespanpackage++;
errorterm += erroradjustup;
if (errorterm >= 0) {
d_pdest += d_pdestextrastep;
d_pz += d_pzextrastep;
d_aspancount += d_countextrastep;
d_ptex += d_ptexextrastep;
d_sfrac += d_sfracextrastep;
d_ptex += d_sfrac >> 16;
d_sfrac &= 0xFFFF;
d_tfrac += d_tfracextrastep;
if (d_tfrac & 0x10000) {
d_ptex += r_affinetridesc.skinwidth;
d_tfrac &= 0xFFFF;
}
d_light += d_lightextrastep;
d_zi += d_ziextrastep;
errorterm -= erroradjustdown;
} else {
d_pdest += d_pdestbasestep;
d_pz += d_pzbasestep;
d_aspancount += ubasestep;
d_ptex += d_ptexbasestep;
d_sfrac += d_sfracbasestep;
d_ptex += d_sfrac >> 16;
d_sfrac &= 0xFFFF;
d_tfrac += d_tfracbasestep;
if (d_tfrac & 0x10000) {
d_ptex += r_affinetridesc.skinwidth;
d_tfrac &= 0xFFFF;
}
d_light += d_lightbasestep;
d_zi += d_zibasestep;
}
} while (--height);
}
static void
D_PolysetSetUpForLineScan (fixed8_t startvertu, fixed8_t startvertv,
fixed8_t endvertu, fixed8_t endvertv)
{
double dm, dn;
int tm, tn;
adivtab_t *ptemp;
// TODO: implement x86 version
errorterm = -1;
tm = endvertu - startvertu;
tn = endvertv - startvertv;
if (((tm <= 16) && (tm >= -15)) && ((tn <= 16) && (tn >= -15))) {
ptemp = &adivtab[((tm + 15) << 5) + (tn + 15)];
ubasestep = ptemp->quotient;
erroradjustup = ptemp->remainder;
erroradjustdown = tn;
} else {
dm = (double) tm;
dn = (double) tn;
FloorDivMod (dm, dn, &ubasestep, &erroradjustup);
erroradjustdown = dn;
}
}
void
D_PolysetCalcGradients (int skinwidth)
{
float xstepdenominv, ystepdenominv, t0, t1;
float p01_minus_p21, p11_minus_p21, p00_minus_p20, p10_minus_p20;
p00_minus_p20 = r_p0[0] - r_p2[0];
p01_minus_p21 = r_p0[1] - r_p2[1];
p10_minus_p20 = r_p1[0] - r_p2[0];
p11_minus_p21 = r_p1[1] - r_p2[1];
xstepdenominv = 1.0 / (float) d_xdenom;
ystepdenominv = -xstepdenominv;
// ceil () for light so positive steps are exaggerated, negative steps
// diminished, pushing us away from underflow toward overflow. Underflow
// is very visible, overflow is very unlikely, because of ambient lighting
t0 = r_p0[4] - r_p2[4];
t1 = r_p1[4] - r_p2[4];
r_lstepx = (int)
ceil ((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
r_lstepy = (int)
ceil ((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
t0 = r_p0[2] - r_p2[2];
t1 = r_p1[2] - r_p2[2];
r_sstepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_sstepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
t0 = r_p0[3] - r_p2[3];
t1 = r_p1[3] - r_p2[3];
r_tstepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_tstepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
t0 = r_p0[5] - r_p2[5];
t1 = r_p1[5] - r_p2[5];
r_zistepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
xstepdenominv);
r_zistepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
ystepdenominv);
// a_sstepxfrac = r_sstepx & 0xFFFF;
// a_tstepxfrac = r_tstepx & 0xFFFF;
// a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
static void
D_PolysetDrawSpans (spanpackage_t * pspanpackage)
{
int i, j, texscantable[1024], *texscan;
// LordHavoc: compute skin row table
for (i = 0, j = -r_affinetridesc.skinheight * r_affinetridesc.skinwidth;
i < r_affinetridesc.skinheight*2;i++, j += r_affinetridesc.skinwidth)
texscantable[i] = j;
texscan = texscantable + r_affinetridesc.skinheight;
switch(r_pixbytes) {
case 1:
{
int lcount, count = 0;
byte *lpdest;
byte *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
d_aspancount += ubasestep;
if (lcount)
{
lpdest = (byte *) d_viewbuffer + pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
// LordHavoc: optimized zbuffer check (switchs between
// loops when state changes, and quickly skips groups
// of hidden pixels)
do
{
if ((lzi >> 16) < *lpz) // hidden
{
count = 0;
goto skiploop8;
}
drawloop8:
*lpz++ = lzi >> 16;
*lpdest++ = ((byte *)acolormap)
[(llight & 0xFF00) | lptex[texscan[ltfrac >> 16] +
(lsfrac >> 16)]];
lzi += r_zistepx;
lsfrac += r_sstepx;
ltfrac += r_tstepx;
llight += r_lstepx;
}
while (--lcount);
goto done8;
do
{
if ((lzi >> 16) >= *lpz) // draw
{
lsfrac += r_sstepx * count;
ltfrac += r_tstepx * count;
llight += r_lstepx * count;
lpdest += count;
goto drawloop8;
}
skiploop8:
count++;
lzi += r_zistepx;
lpz++;
}
while (--lcount);
done8: ;
}
pspanpackage++;
}
while (pspanpackage->count != -999999);
}
break;
case 2:
{
int lcount, count = 0;
short *lpdest;
byte *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
d_aspancount += ubasestep;
if (lcount)
{
lpdest = (short *) d_viewbuffer + pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) < *lpz) // hidden
{
count = 0;
goto skiploop16;
}
drawloop16:
*lpz++ = lzi >> 16;
*lpdest++ = ((short *)acolormap)[(llight & 0xFF00) | lptex[texscan[ltfrac >> 16] + (lsfrac >> 16)]];
lzi += r_zistepx;
lsfrac += r_sstepx;
ltfrac += r_tstepx;
llight += r_lstepx;
}
while (--lcount);
goto done16;
do
{
if ((lzi >> 16) >= *lpz) // draw
{
lsfrac += r_sstepx * count;
ltfrac += r_tstepx * count;
llight += r_lstepx * count;
lpdest += count;
goto drawloop16;
}
skiploop16:
count++;
lzi += r_zistepx;
lpz++;
}
while (--lcount);
done16: ;
}
pspanpackage++;
}
while (pspanpackage->count != -999999);
}
break;
case 4:
{
int lcount, count = 0;
int *lpdest;
byte *lptex;
int lsfrac, ltfrac;
int llight;
int lzi;
short *lpz;
do
{
lcount = d_aspancount - pspanpackage->count;
errorterm += erroradjustup;
if (errorterm >= 0)
{
d_aspancount += d_countextrastep;
errorterm -= erroradjustdown;
}
else
d_aspancount += ubasestep;
if (lcount)
{
lpdest = (int *) d_viewbuffer + pspanpackage->pdest;
lptex = pspanpackage->ptex;
lpz = pspanpackage->pz;
lsfrac = pspanpackage->sfrac;
ltfrac = pspanpackage->tfrac;
llight = pspanpackage->light;
lzi = pspanpackage->zi;
do
{
if ((lzi >> 16) < *lpz) // hidden
{
count = 0;
goto skiploop32;
}
drawloop32:
*lpz++ = lzi >> 16;
*lpdest++ =
vid.colormap32[(llight & 0xFF00) |
lptex[texscan[ltfrac >> 16] +
(lsfrac >> 16)]];
lzi += r_zistepx;
lsfrac += r_sstepx;
ltfrac += r_tstepx;
llight += r_lstepx;
}
while (--lcount);
goto done32;
do
{
if ((lzi >> 16) >= *lpz) // draw
{
lsfrac += r_sstepx * count;
ltfrac += r_tstepx * count;
llight += r_lstepx * count;
lpdest += count;
goto drawloop32;
}
skiploop32:
count++;
lzi += r_zistepx;
lpz++;
}
while (--lcount);
done32: ;
}
pspanpackage++;
}
while (pspanpackage->count != -999999);
}
break;
default:
Sys_Error("D_PolysetDrawSpans: unsupported r_pixbytes %i",
r_pixbytes);
}
}
void
D_RasterizeAliasPolySmooth (void)
{
int initialleftheight, initialrightheight;
int *plefttop, *prighttop, *pleftbottom, *prightbottom;
int working_lstepx, originalcount;
plefttop = pedgetable->pleftedgevert0;
prighttop = pedgetable->prightedgevert0;
pleftbottom = pedgetable->pleftedgevert1;
prightbottom = pedgetable->prightedgevert1;
initialleftheight = pleftbottom[1] - plefttop[1];
initialrightheight = prightbottom[1] - prighttop[1];
// set the s, t, and light gradients, which are consistent across the
// triangle, because being a triangle, things are affine
D_PolysetCalcGradients (r_affinetridesc.skinwidth);
// rasterize the polygon
// scan out the top (and possibly only) part of the left edge
D_PolysetSetUpForLineScan (plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
d_pedgespanpackage = a_spans;
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (byte *) r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
d_sfrac = plefttop[2] & 0xFFFF;
d_tfrac = plefttop[3] & 0xFFFF;
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = screenwidth + ubasestep;
d_pdestextrastep = d_pdestbasestep + 1;
// LordHavoc: d_pdest has been changed to pixel offset
d_pdest = ystart * screenwidth + plefttop[0];
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
// TODO: can reuse partial expressions here
// for negative steps in x along left edge, bias toward overflow rather
// than underflow (sort of turning the floor () we did in the gradient
// calcs into ceil (), but plus a little bit)
if (ubasestep < 0)
working_lstepx = r_lstepx - 1;
else
working_lstepx = r_lstepx;
d_countextrastep = ubasestep + 1;
d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> 16) +
((r_tstepy + r_tstepx * ubasestep) >> 16) * r_affinetridesc.skinwidth;
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
d_lightbasestep = r_lstepy + working_lstepx * ubasestep;
d_zibasestep = r_zistepy + r_zistepx * ubasestep;
d_ptexextrastep = ((r_sstepy + r_sstepx * d_countextrastep) >> 16) +
((r_tstepy + r_tstepx * d_countextrastep) >> 16) *
r_affinetridesc.skinwidth;
d_sfracextrastep = (r_sstepy + r_sstepx * d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy + r_tstepx * d_countextrastep) & 0xFFFF;
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
D_PolysetScanLeftEdge (initialleftheight);
// scan out the bottom part of the left edge, if it exists
if (pedgetable->numleftedges == 2) {
int height;
plefttop = pleftbottom;
pleftbottom = pedgetable->pleftedgevert2;
D_PolysetSetUpForLineScan (plefttop[0], plefttop[1],
pleftbottom[0], pleftbottom[1]);
height = pleftbottom[1] - plefttop[1];
// TODO: make this a function; modularize this function in general
ystart = plefttop[1];
d_aspancount = plefttop[0] - prighttop[0];
d_ptex = (byte *) r_affinetridesc.pskin + (plefttop[2] >> 16) +
(plefttop[3] >> 16) * r_affinetridesc.skinwidth;
d_sfrac = 0;
d_tfrac = 0;
d_light = plefttop[4];
d_zi = plefttop[5];
d_pdestbasestep = screenwidth + ubasestep;
d_pdestextrastep = d_pdestbasestep + 1;
// LordHavoc: d_pdest and relatives have been changed to pixel
// offsets into framebuffer
d_pdest = ystart * screenwidth + plefttop[0];
d_pzbasestep = d_zwidth + ubasestep;
d_pzextrastep = d_pzbasestep + 1;
d_pz = d_pzbuffer + ystart * d_zwidth + plefttop[0];
if (ubasestep < 0)
working_lstepx = r_lstepx - 1;
else
working_lstepx = r_lstepx;
d_countextrastep = ubasestep + 1;
d_ptexbasestep = ((r_sstepy + r_sstepx * ubasestep) >> 16) +
((r_tstepy + r_tstepx * ubasestep) >> 16) *
r_affinetridesc.skinwidth;
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
d_lightbasestep = r_lstepy + working_lstepx * ubasestep;
d_zibasestep = r_zistepy + r_zistepx * ubasestep;
d_ptexextrastep = ((r_sstepy + r_sstepx * d_countextrastep) >> 16) +
((r_tstepy + r_tstepx * d_countextrastep) >> 16) *
r_affinetridesc.skinwidth;
d_sfracextrastep = (r_sstepy + r_sstepx * d_countextrastep) & 0xFFFF;
d_tfracextrastep = (r_tstepy + r_tstepx * d_countextrastep) & 0xFFFF;
d_lightextrastep = d_lightbasestep + working_lstepx;
d_ziextrastep = d_zibasestep + r_zistepx;
D_PolysetScanLeftEdge (height);
}
// scan out the top (and possibly only) part of the right edge, updating
// the count field
d_pedgespanpackage = a_spans;
D_PolysetSetUpForLineScan (prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_aspancount = 0;
d_countextrastep = ubasestep + 1;
originalcount = a_spans[initialrightheight].count;
a_spans[initialrightheight].count = -999999; // mark end of the
// spanpackages
D_PolysetDrawSpans (a_spans);
// scan out the bottom part of the right edge, if it exists
if (pedgetable->numrightedges == 2) {
int height;
spanpackage_t *pstart;
pstart = a_spans + initialrightheight;
pstart->count = originalcount;
d_aspancount = prightbottom[0] - prighttop[0];
prighttop = prightbottom;
prightbottom = pedgetable->prightedgevert2;
height = prightbottom[1] - prighttop[1];
D_PolysetSetUpForLineScan (prighttop[0], prighttop[1],
prightbottom[0], prightbottom[1]);
d_countextrastep = ubasestep + 1;
a_spans[initialrightheight + height].count = -999999;
// mark end of the spanpackages
D_PolysetDrawSpans (pstart);
}
}
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