mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-13 08:27:39 +00:00
72fb96245f
Names not mangled, but those symbols that could be made static have been. Also, many dead variables have been removed.
931 lines
23 KiB
C
931 lines
23 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__ ((used)) const char rcsid[] =
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"$Id$";
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#include "QF/render.h"
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#include "d_local.h"
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#include "r_local.h"
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int ubasestep, errorterm, erroradjustup, erroradjustdown;
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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 spanpackage_s {
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void *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_xdenom;
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static edgetable *pedgetable;
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static 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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byte *d_pdest, *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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byte *skintable[MAX_LBM_HEIGHT];
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int skinwidth;
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byte *skinstart;
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#ifdef PIC
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#undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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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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#ifndef USE_INTEL_ASM
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static void
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D_PolysetRecursiveTriangle (int *lp1, int *lp2, int *lp3)
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{
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int *temp;
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int d;
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int new[6];
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int z;
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short *zbuf;
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d = lp2[0] - lp1[0];
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if (d < -1 || d > 1)
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goto split;
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d = lp2[1] - lp1[1];
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if (d < -1 || d > 1)
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goto split;
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d = lp3[0] - lp2[0];
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if (d < -1 || d > 1)
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goto split2;
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d = lp3[1] - lp2[1];
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if (d < -1 || d > 1)
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goto split2;
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d = lp1[0] - lp3[0];
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if (d < -1 || d > 1)
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goto split3;
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d = lp1[1] - lp3[1];
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if (d < -1 || d > 1) {
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split3:
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temp = lp1;
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lp1 = lp3;
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lp3 = lp2;
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lp2 = temp;
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goto split;
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}
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return; // entire tri is filled
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split2:
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temp = lp1;
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lp1 = lp2;
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lp2 = lp3;
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lp3 = temp;
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split:
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// split this edge
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new[0] = (lp1[0] + lp2[0]) >> 1;
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new[1] = (lp1[1] + lp2[1]) >> 1;
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new[2] = (lp1[2] + lp2[2]) >> 1;
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new[3] = (lp1[3] + lp2[3]) >> 1;
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new[5] = (lp1[5] + lp2[5]) >> 1;
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// draw the point if splitting a leading edge
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if (lp2[1] > lp1[1])
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goto nodraw;
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if ((lp2[1] == lp1[1]) && (lp2[0] < lp1[0]))
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goto nodraw;
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z = new[5] >> 16;
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zbuf = zspantable[new[1]] + new[0];
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if (z >= *zbuf) {
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int pix;
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*zbuf = z;
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pix = d_pcolormap[skintable[new[3] >> 16][new[2] >> 16]];
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d_viewbuffer[d_scantable[new[1]] + new[0]] = pix;
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}
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nodraw:
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// recursively continue
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D_PolysetRecursiveTriangle (lp3, lp1, new);
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D_PolysetRecursiveTriangle (lp3, new, lp2);
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}
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static void
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D_DrawSubdiv (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++) {
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index0 = pfv + ptri[i].vertindex[0];
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index1 = pfv + ptri[i].vertindex[1];
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index2 = pfv + ptri[i].vertindex[2];
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if (((index0->v[1] - index1->v[1]) *
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(index0->v[0] - index2->v[0]) -
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(index0->v[0] - index1->v[0]) *
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(index0->v[1] - index2->v[1])) >= 0) {
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continue;
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}
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d_pcolormap = &((byte *) acolormap)[index0->v[4] & 0xFF00];
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if (ptri[i].facesfront) {
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D_PolysetRecursiveTriangle (index0->v, index1->v, index2->v);
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} else {
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int s0, s1, s2;
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s0 = index0->v[2];
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s1 = index1->v[2];
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s2 = index2->v[2];
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if (index0->flags & ALIAS_ONSEAM)
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index0->v[2] += r_affinetridesc.seamfixupX16;
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if (index1->flags & ALIAS_ONSEAM)
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index1->v[2] += r_affinetridesc.seamfixupX16;
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if (index2->flags & ALIAS_ONSEAM)
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index2->v[2] += r_affinetridesc.seamfixupX16;
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D_PolysetRecursiveTriangle (index0->v, index1->v, index2->v);
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index0->v[2] = s0;
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index1->v[2] = s1;
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index2->v[2] = s2;
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}
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}
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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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(((intptr_t) &spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
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if (r_affinetridesc.drawtype) {
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D_DrawSubdiv ();
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} else {
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D_DrawNonSubdiv ();
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}
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}
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void
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D_PolysetDrawFinalVerts (finalvert_t *fv, int numverts)
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{
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int i, z;
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short *zbuf;
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for (i = 0; i < numverts; i++, fv++) {
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// valid triangle coordinates for filling can include the bottom and
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// right clip edges, due to the fill rule; these shouldn't be drawn
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if ((fv->v[0] < r_refdef.vrectright) &&
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(fv->v[1] < r_refdef.vrectbottom)) {
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z = fv->v[5] >> 16;
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zbuf = zspantable[fv->v[1]] + fv->v[0];
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if (z >= *zbuf) {
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int pix;
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*zbuf = z;
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pix = skintable[fv->v[3] >> 16][fv->v[2] >> 16];
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pix = ((byte *) acolormap)[pix + (fv->v[4] & 0xFF00)];
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d_viewbuffer[d_scantable[fv->v[1]] + fv->v[0]] = pix;
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}
|
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}
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}
|
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}
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#endif // !USE_INTEL_ASM
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|
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void
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D_PolysetUpdateTables (void)
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{
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int i;
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byte *s;
|
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if (r_affinetridesc.skinwidth != skinwidth ||
|
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r_affinetridesc.pskin != skinstart) {
|
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skinwidth = r_affinetridesc.skinwidth;
|
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skinstart = r_affinetridesc.pskin;
|
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s = skinstart;
|
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for (i = 0; i < MAX_LBM_HEIGHT; i++, s += skinwidth)
|
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skintable[i] = s;
|
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}
|
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}
|
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|
|
|
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#ifndef USE_INTEL_ASM
|
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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;
|
|
d_pedgespanpackage->pz = d_pz;
|
|
d_pedgespanpackage->count = d_aspancount;
|
|
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++;
|
|
|
|
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;
|
|
|
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d_sfrac &= 0xFFFF;
|
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d_tfrac += d_tfracextrastep;
|
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if (d_tfrac & 0x10000) {
|
|
d_ptex += r_affinetridesc.skinwidth;
|
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d_tfrac &= 0xFFFF;
|
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}
|
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d_light += d_lightextrastep;
|
|
d_zi += d_ziextrastep;
|
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errorterm -= erroradjustdown;
|
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} 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);
|
|
}
|
|
#endif // !USE_INTEL_ASM
|
|
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
|
|
#ifndef USE_INTEL_ASM
|
|
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);
|
|
|
|
#ifdef USE_INTEL_ASM
|
|
a_sstepxfrac = r_sstepx << 16;
|
|
a_tstepxfrac = r_tstepx << 16;
|
|
#else
|
|
a_sstepxfrac = r_sstepx & 0xFFFF;
|
|
a_tstepxfrac = r_tstepx & 0xFFFF;
|
|
#endif
|
|
|
|
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
|
|
}
|
|
#endif // !USE_INTEL_ASM
|
|
|
|
#if 0 //XXX eh?
|
|
byte gelmap[256];
|
|
|
|
static void
|
|
InitGel (byte * palette)
|
|
{
|
|
int i;
|
|
int r;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
// r = (palette[i*3]>>4);
|
|
r =
|
|
(palette[i * 3] + palette[i * 3 + 1] +
|
|
palette[i * 3 + 2]) / (16 * 3);
|
|
gelmap[i] = /* 64 */ 0 + r;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifndef USE_INTEL_ASM
|
|
void
|
|
D_PolysetDrawSpans8 (spanpackage_t * pspanpackage)
|
|
{
|
|
int lcount;
|
|
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 = 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) {
|
|
*lpdest = ((byte *) acolormap)[*lptex + (llight & 0xFF00)];
|
|
// gel mapping *lpdest = gelmap[*lpdest];
|
|
*lpz = lzi >> 16;
|
|
}
|
|
lpdest++;
|
|
lzi += r_zistepx;
|
|
lpz++;
|
|
llight += r_lstepx;
|
|
lptex += a_ststepxwhole;
|
|
lsfrac += a_sstepxfrac;
|
|
lptex += lsfrac >> 16;
|
|
lsfrac &= 0xFFFF;
|
|
ltfrac += a_tstepxfrac;
|
|
if (ltfrac & 0x10000) {
|
|
lptex += r_affinetridesc.skinwidth;
|
|
ltfrac &= 0xFFFF;
|
|
}
|
|
} while (--lcount);
|
|
}
|
|
|
|
pspanpackage++;
|
|
} while (pspanpackage->count != -999999);
|
|
}
|
|
#endif // !USE_INTEL_ASM
|
|
|
|
|
|
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;
|
|
#ifdef USE_INTEL_ASM
|
|
d_sfrac = (plefttop[2] & 0xFFFF) << 16;
|
|
d_tfrac = (plefttop[3] & 0xFFFF) << 16;
|
|
d_pzbasestep = (d_zwidth + ubasestep) << 1;
|
|
d_pzextrastep = d_pzbasestep + 2;
|
|
#else
|
|
d_sfrac = plefttop[2] & 0xFFFF;
|
|
d_tfrac = plefttop[3] & 0xFFFF;
|
|
d_pzbasestep = d_zwidth + ubasestep;
|
|
d_pzextrastep = d_pzbasestep + 1;
|
|
#endif
|
|
d_light = plefttop[4];
|
|
d_zi = plefttop[5];
|
|
|
|
d_pdestbasestep = screenwidth + ubasestep;
|
|
d_pdestextrastep = d_pdestbasestep + 1;
|
|
d_pdest = (byte *) d_viewbuffer + 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;
|
|
#ifdef USE_INTEL_ASM
|
|
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
|
|
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
|
|
#else
|
|
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
|
|
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
|
|
#endif
|
|
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;
|
|
#ifdef USE_INTEL_ASM
|
|
d_sfracextrastep = (r_sstepy + r_sstepx * d_countextrastep) << 16;
|
|
d_tfracextrastep = (r_tstepy + r_tstepx * d_countextrastep) << 16;
|
|
#else
|
|
d_sfracextrastep = (r_sstepy + r_sstepx * d_countextrastep) & 0xFFFF;
|
|
d_tfracextrastep = (r_tstepy + r_tstepx * d_countextrastep) & 0xFFFF;
|
|
#endif
|
|
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;
|
|
d_pdest = (byte *) d_viewbuffer + ystart * screenwidth + plefttop[0];
|
|
#ifdef USE_INTEL_ASM
|
|
d_pzbasestep = (d_zwidth + ubasestep) << 1;
|
|
d_pzextrastep = d_pzbasestep + 2;
|
|
#else
|
|
d_pzbasestep = d_zwidth + ubasestep;
|
|
d_pzextrastep = d_pzbasestep + 1;
|
|
#endif
|
|
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;
|
|
#ifdef USE_INTEL_ASM
|
|
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) << 16;
|
|
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) << 16;
|
|
#else
|
|
d_sfracbasestep = (r_sstepy + r_sstepx * ubasestep) & 0xFFFF;
|
|
d_tfracbasestep = (r_tstepy + r_tstepx * ubasestep) & 0xFFFF;
|
|
#endif
|
|
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;
|
|
#ifdef USE_INTEL_ASM
|
|
d_sfracextrastep =
|
|
((r_sstepy + r_sstepx * d_countextrastep) & 0xFFFF) << 16;
|
|
d_tfracextrastep =
|
|
((r_tstepy + r_tstepx * d_countextrastep) & 0xFFFF) << 16;
|
|
#else
|
|
d_sfracextrastep = (r_sstepy + r_sstepx * d_countextrastep) & 0xFFFF;
|
|
d_tfracextrastep = (r_tstepy + r_tstepx * d_countextrastep) & 0xFFFF;
|
|
#endif
|
|
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_PolysetDrawSpans8 (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_PolysetDrawSpans8 (pstart);
|
|
}
|
|
}
|
|
|
|
|
|
#if 0
|
|
|
|
void
|
|
D_PolysetRecursiveDrawLine (int *lp1, int *lp2)
|
|
{
|
|
int d;
|
|
int new[6];
|
|
int ofs;
|
|
|
|
d = lp2[0] - lp1[0];
|
|
if (d < -1 || d > 1)
|
|
goto split;
|
|
d = lp2[1] - lp1[1];
|
|
if (d < -1 || d > 1)
|
|
goto split;
|
|
|
|
return; // line is completed
|
|
|
|
split:
|
|
// split this edge
|
|
new[0] = (lp1[0] + lp2[0]) >> 1;
|
|
new[1] = (lp1[1] + lp2[1]) >> 1;
|
|
new[5] = (lp1[5] + lp2[5]) >> 1;
|
|
new[2] = (lp1[2] + lp2[2]) >> 1;
|
|
new[3] = (lp1[3] + lp2[3]) >> 1;
|
|
new[4] = (lp1[4] + lp2[4]) >> 1;
|
|
|
|
// draw the point
|
|
ofs = d_scantable[new[1]] + new[0];
|
|
if (new[5] > d_pzbuffer[ofs]) {
|
|
int pix;
|
|
|
|
d_pzbuffer[ofs] = new[5];
|
|
pix = skintable[new[3] >> 16][new[2] >> 16];
|
|
// pix = ((byte *)acolormap)[pix + (new[4] & 0xFF00)];
|
|
d_viewbuffer[ofs] = pix;
|
|
}
|
|
// recursively continue
|
|
D_PolysetRecursiveDrawLine (lp1, new);
|
|
D_PolysetRecursiveDrawLine (new, lp2);
|
|
}
|
|
|
|
|
|
void
|
|
D_PolysetRecursiveTriangle2 (int *lp1, int *lp2, int *lp3)
|
|
{
|
|
int d;
|
|
int new[4];
|
|
|
|
d = lp2[0] - lp1[0];
|
|
if (d < -1 || d > 1)
|
|
goto split;
|
|
d = lp2[1] - lp1[1];
|
|
if (d < -1 || d > 1)
|
|
goto split;
|
|
return;
|
|
|
|
split:
|
|
// split this edge
|
|
new[0] = (lp1[0] + lp2[0]) >> 1;
|
|
new[1] = (lp1[1] + lp2[1]) >> 1;
|
|
new[5] = (lp1[5] + lp2[5]) >> 1;
|
|
new[2] = (lp1[2] + lp2[2]) >> 1;
|
|
new[3] = (lp1[3] + lp2[3]) >> 1;
|
|
new[4] = (lp1[4] + lp2[4]) >> 1;
|
|
|
|
D_PolysetRecursiveDrawLine (new, lp3);
|
|
|
|
// recursively continue
|
|
D_PolysetRecursiveTriangle (lp1, new, lp3);
|
|
D_PolysetRecursiveTriangle (new, lp2, lp3);
|
|
}
|
|
|
|
#endif
|