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https://git.code.sf.net/p/quake/quakeforge
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799 lines
20 KiB
C
799 lines
20 KiB
C
/*
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d_polyse.c
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routines for drawing sets of polygons sharing the same texture
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(used for Alias models)
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Copyright (C) 1996-1997 Id Software, Inc.
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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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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.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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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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static __attribute__ ((unused)) const char rcsid[] =
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"$Id$";
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#include "QF/sys.h"
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#include "d_local.h"
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#include "r_local.h"
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// TODO: put in span spilling to shrink list size
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// !!! if this is changed, it must be changed in d_polysa.s too !!!
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#define DPS_MAXSPANS MAXHEIGHT+1 // +1 for spanpackage marking end
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// !!! if this is changed, it must be changed in asm_draw.h too !!!
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typedef struct {
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int pdest;
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short *pz;
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int count;
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byte *ptex;
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int sfrac, tfrac, light, zi;
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} spanpackage_t;
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typedef struct {
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int isflattop;
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int numleftedges;
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int *pleftedgevert0;
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int *pleftedgevert1;
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int *pleftedgevert2;
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int numrightedges;
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int *prightedgevert0;
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int *prightedgevert1;
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int *prightedgevert2;
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} edgetable;
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int r_p0[6], r_p1[6], r_p2[6];
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byte *d_pcolormap;
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int d_aflatcolor;
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int d_xdenom;
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edgetable *pedgetable;
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edgetable edgetables[12] = {
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{0, 1, r_p0, r_p2, NULL, 2, r_p0, r_p1, r_p2},
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{0, 2, r_p1, r_p0, r_p2, 1, r_p1, r_p2, NULL},
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{1, 1, r_p0, r_p2, NULL, 1, r_p1, r_p2, NULL},
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{0, 1, r_p1, r_p0, NULL, 2, r_p1, r_p2, r_p0},
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{0, 2, r_p0, r_p2, r_p1, 1, r_p0, r_p1, NULL},
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{0, 1, r_p2, r_p1, NULL, 1, r_p2, r_p0, NULL},
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{0, 1, r_p2, r_p1, NULL, 2, r_p2, r_p0, r_p1},
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{0, 2, r_p2, r_p1, r_p0, 1, r_p2, r_p0, NULL},
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{0, 1, r_p1, r_p0, NULL, 1, r_p1, r_p2, NULL},
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{1, 1, r_p2, r_p1, NULL, 1, r_p0, r_p1, NULL},
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{1, 1, r_p1, r_p0, NULL, 1, r_p2, r_p0, NULL},
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{0, 1, r_p0, r_p2, NULL, 1, r_p0, r_p1, NULL},
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};
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// FIXME: some of these can become statics
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int a_sstepxfrac, a_tstepxfrac, a_ststepxwhole;
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int r_sstepx, r_tstepx, r_lstepx, r_lstepy, r_sstepy, r_tstepy;
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int r_zistepx, r_zistepy;
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int d_aspancount, d_countextrastep;
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spanpackage_t *a_spans;
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spanpackage_t *d_pedgespanpackage;
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static int ystart;
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int d_pdest;
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byte *d_ptex;
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short *d_pz;
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int d_sfrac, d_tfrac, d_light, d_zi;
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int d_ptexextrastep, d_sfracextrastep;
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int d_tfracextrastep, d_lightextrastep, d_pdestextrastep;
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int d_lightbasestep, d_pdestbasestep, d_ptexbasestep;
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int d_sfracbasestep, d_tfracbasestep;
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int d_ziextrastep, d_zibasestep;
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int d_pzextrastep, d_pzbasestep;
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typedef struct {
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int quotient;
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int remainder;
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} adivtab_t;
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static adivtab_t adivtab[32 * 32] = {
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#include "adivtab.h"
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};
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void
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D_PolysetSetEdgeTable (void)
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{
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int edgetableindex;
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// assume the vertices are already in top to bottom order
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edgetableindex = 0;
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// determine which edges are right & left, and the order in which
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// to rasterize them
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if (r_p0[1] >= r_p1[1]) {
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if (r_p0[1] == r_p1[1]) {
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if (r_p0[1] < r_p2[1])
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pedgetable = &edgetables[2];
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else
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pedgetable = &edgetables[5];
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return;
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} else {
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edgetableindex = 1;
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}
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}
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if (r_p0[1] == r_p2[1]) {
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if (edgetableindex)
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pedgetable = &edgetables[8];
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else
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pedgetable = &edgetables[9];
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return;
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} else if (r_p1[1] == r_p2[1]) {
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if (edgetableindex)
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pedgetable = &edgetables[10];
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else
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pedgetable = &edgetables[11];
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return;
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}
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if (r_p0[1] > r_p2[1])
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edgetableindex += 2;
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if (r_p1[1] > r_p2[1])
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edgetableindex += 4;
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pedgetable = &edgetables[edgetableindex];
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}
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static void
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D_DrawNonSubdiv (void)
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{
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mtriangle_t *ptri;
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finalvert_t *pfv, *index0, *index1, *index2;
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int i;
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int lnumtriangles;
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pfv = r_affinetridesc.pfinalverts;
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ptri = r_affinetridesc.ptriangles;
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lnumtriangles = r_affinetridesc.numtriangles;
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for (i = 0; i < lnumtriangles; i++, ptri++) {
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index0 = pfv + ptri->vertindex[0];
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index1 = pfv + ptri->vertindex[1];
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index2 = pfv + ptri->vertindex[2];
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d_xdenom =
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(index0->v[1] - index1->v[1]) * (index0->v[0] - index2->v[0]) -
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(index0->v[0] - index1->v[0]) * (index0->v[1] - index2->v[1]);
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if (d_xdenom >= 0)
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continue;
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r_p0[0] = index0->v[0]; // u
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r_p0[1] = index0->v[1]; // v
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r_p0[2] = index0->v[2]; // s
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r_p0[3] = index0->v[3]; // t
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r_p0[4] = index0->v[4]; // light
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r_p0[5] = index0->v[5]; // iz
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r_p1[0] = index1->v[0];
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r_p1[1] = index1->v[1];
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r_p1[2] = index1->v[2];
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r_p1[3] = index1->v[3];
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r_p1[4] = index1->v[4];
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r_p1[5] = index1->v[5];
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r_p2[0] = index2->v[0];
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r_p2[1] = index2->v[1];
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r_p2[2] = index2->v[2];
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r_p2[3] = index2->v[3];
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r_p2[4] = index2->v[4];
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r_p2[5] = index2->v[5];
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if (!ptri->facesfront) {
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if (index0->flags & ALIAS_ONSEAM)
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r_p0[2] += r_affinetridesc.seamfixupX16;
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if (index1->flags & ALIAS_ONSEAM)
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r_p1[2] += r_affinetridesc.seamfixupX16;
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if (index2->flags & ALIAS_ONSEAM)
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r_p2[2] += r_affinetridesc.seamfixupX16;
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}
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D_PolysetSetEdgeTable ();
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D_RasterizeAliasPolySmooth ();
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}
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}
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void
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D_PolysetDraw (void)
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{
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spanpackage_t spans[DPS_MAXSPANS + 1 +
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((CACHE_SIZE - 1) / sizeof (spanpackage_t)) + 1];
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// one extra because of cache line pretouching
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a_spans = (spanpackage_t *)
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(((long) &spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
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D_DrawNonSubdiv ();
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}
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void
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D_PolysetScanLeftEdge (int height)
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{
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do {
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d_pedgespanpackage->pdest = d_pdest;
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d_pedgespanpackage->pz = d_pz;
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d_pedgespanpackage->count = d_aspancount;
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d_pedgespanpackage->ptex = d_ptex;
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d_pedgespanpackage->sfrac = d_sfrac;
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d_pedgespanpackage->tfrac = d_tfrac;
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// FIXME: need to clamp l, s, t, at both ends?
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d_pedgespanpackage->light = d_light;
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d_pedgespanpackage->zi = d_zi;
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d_pedgespanpackage++;
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errorterm += erroradjustup;
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if (errorterm >= 0) {
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d_pdest += d_pdestextrastep;
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d_pz += d_pzextrastep;
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d_aspancount += d_countextrastep;
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d_ptex += d_ptexextrastep;
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d_sfrac += d_sfracextrastep;
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d_ptex += d_sfrac >> 16;
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d_sfrac &= 0xFFFF;
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d_tfrac += d_tfracextrastep;
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if (d_tfrac & 0x10000) {
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d_ptex += r_affinetridesc.skinwidth;
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d_tfrac &= 0xFFFF;
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}
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d_light += d_lightextrastep;
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d_zi += d_ziextrastep;
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errorterm -= erroradjustdown;
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} else {
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d_pdest += d_pdestbasestep;
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d_pz += d_pzbasestep;
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d_aspancount += ubasestep;
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d_ptex += d_ptexbasestep;
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d_sfrac += d_sfracbasestep;
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d_ptex += d_sfrac >> 16;
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d_sfrac &= 0xFFFF;
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d_tfrac += d_tfracbasestep;
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if (d_tfrac & 0x10000) {
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d_ptex += r_affinetridesc.skinwidth;
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d_tfrac &= 0xFFFF;
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}
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d_light += d_lightbasestep;
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d_zi += d_zibasestep;
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}
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} while (--height);
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}
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static void
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D_PolysetSetUpForLineScan (fixed8_t startvertu, fixed8_t startvertv,
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fixed8_t endvertu, fixed8_t endvertv)
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{
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double dm, dn;
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int tm, tn;
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adivtab_t *ptemp;
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// TODO: implement x86 version
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errorterm = -1;
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tm = endvertu - startvertu;
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tn = endvertv - startvertv;
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if (((tm <= 16) && (tm >= -15)) && ((tn <= 16) && (tn >= -15))) {
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ptemp = &adivtab[((tm + 15) << 5) + (tn + 15)];
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ubasestep = ptemp->quotient;
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erroradjustup = ptemp->remainder;
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erroradjustdown = tn;
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} else {
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dm = (double) tm;
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dn = (double) tn;
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FloorDivMod (dm, dn, &ubasestep, &erroradjustup);
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erroradjustdown = dn;
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}
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}
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void
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D_PolysetCalcGradients (int skinwidth)
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{
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float xstepdenominv, ystepdenominv, t0, t1;
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float p01_minus_p21, p11_minus_p21, p00_minus_p20, p10_minus_p20;
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p00_minus_p20 = r_p0[0] - r_p2[0];
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p01_minus_p21 = r_p0[1] - r_p2[1];
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p10_minus_p20 = r_p1[0] - r_p2[0];
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p11_minus_p21 = r_p1[1] - r_p2[1];
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xstepdenominv = 1.0 / (float) d_xdenom;
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ystepdenominv = -xstepdenominv;
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// ceil () for light so positive steps are exaggerated, negative steps
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// diminished, pushing us away from underflow toward overflow. Underflow
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// is very visible, overflow is very unlikely, because of ambient lighting
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t0 = r_p0[4] - r_p2[4];
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t1 = r_p1[4] - r_p2[4];
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r_lstepx = (int)
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ceil ((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
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r_lstepy = (int)
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ceil ((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
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t0 = r_p0[2] - r_p2[2];
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t1 = r_p1[2] - r_p2[2];
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r_sstepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
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xstepdenominv);
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r_sstepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
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ystepdenominv);
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t0 = r_p0[3] - r_p2[3];
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t1 = r_p1[3] - r_p2[3];
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r_tstepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
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xstepdenominv);
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r_tstepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
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ystepdenominv);
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t0 = r_p0[5] - r_p2[5];
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t1 = r_p1[5] - r_p2[5];
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r_zistepx = (int) ((t1 * p01_minus_p21 - t0 * p11_minus_p21) *
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xstepdenominv);
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r_zistepy = (int) ((t1 * p00_minus_p20 - t0 * p10_minus_p20) *
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ystepdenominv);
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// a_sstepxfrac = r_sstepx & 0xFFFF;
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// a_tstepxfrac = r_tstepx & 0xFFFF;
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// a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
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}
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static void
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D_PolysetDrawSpans (spanpackage_t * pspanpackage)
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{
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int i, j, texscantable[1024], *texscan;
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// LordHavoc: compute skin row table
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for (i = 0, j = -r_affinetridesc.skinheight * r_affinetridesc.skinwidth;
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i < r_affinetridesc.skinheight*2;i++, j += r_affinetridesc.skinwidth)
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texscantable[i] = j;
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texscan = texscantable + r_affinetridesc.skinheight;
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switch(r_pixbytes) {
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case 1:
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{
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int lcount, count = 0;
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byte *lpdest;
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byte *lptex;
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int lsfrac, ltfrac;
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int llight;
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int lzi;
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short *lpz;
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do
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{
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lcount = d_aspancount - pspanpackage->count;
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errorterm += erroradjustup;
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if (errorterm >= 0)
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{
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d_aspancount += d_countextrastep;
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errorterm -= erroradjustdown;
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}
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else
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d_aspancount += ubasestep;
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if (lcount)
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{
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lpdest = (byte *) d_viewbuffer + pspanpackage->pdest;
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lptex = pspanpackage->ptex;
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lpz = pspanpackage->pz;
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lsfrac = pspanpackage->sfrac;
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ltfrac = pspanpackage->tfrac;
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llight = pspanpackage->light;
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lzi = pspanpackage->zi;
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// LordHavoc: optimized zbuffer check (switchs between
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// loops when state changes, and quickly skips groups
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// of hidden pixels)
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do
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{
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if ((lzi >> 16) < *lpz) // hidden
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{
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count = 0;
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goto skiploop8;
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}
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drawloop8:
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*lpz++ = lzi >> 16;
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*lpdest++ = ((byte *)acolormap)
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[(llight & 0xFF00) | lptex[texscan[ltfrac >> 16] +
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(lsfrac >> 16)]];
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lzi += r_zistepx;
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lsfrac += r_sstepx;
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ltfrac += r_tstepx;
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llight += r_lstepx;
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}
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while (--lcount);
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goto done8;
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do
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{
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if ((lzi >> 16) >= *lpz) // draw
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{
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lsfrac += r_sstepx * count;
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ltfrac += r_tstepx * count;
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llight += r_lstepx * count;
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lpdest += count;
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goto drawloop8;
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}
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skiploop8:
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count++;
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lzi += r_zistepx;
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lpz++;
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}
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while (--lcount);
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done8: ;
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}
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|
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pspanpackage++;
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}
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while (pspanpackage->count != -999999);
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}
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break;
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|
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case 2:
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{
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int lcount, count = 0;
|
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short *lpdest;
|
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byte *lptex;
|
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int lsfrac, ltfrac;
|
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int llight;
|
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int lzi;
|
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short *lpz;
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|
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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);
|
|
}
|
|
}
|