mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-25 12:10:59 +00:00
729 lines
18 KiB
C
729 lines
18 KiB
C
/*
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d_sprite.c
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software top-level rasterization driver module for drawing sprites
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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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static const char rcsid[] =
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"$Id$";
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "compat.h"
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#include "d_local.h"
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static int sprite_height;
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static int minindex, maxindex;
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static sspan_t *sprite_spans;
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void
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D_SpriteDrawSpans (sspan_t *pspan)
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{
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switch(r_pixbytes) {
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case 1:
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{
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int count, spancount, izistep;
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int izi;
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byte *pbase;
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byte *pdest;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz8stepu, tdivz8stepu, zi8stepu;
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byte btemp;
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short *pz;
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sstep = 0; // keep compiler happy
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tstep = 0; // ditto
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pbase = (byte *) cacheblock;
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sdivz8stepu = d_sdivzstepu * 8;
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tdivz8stepu = d_tdivzstepu * 8;
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zi8stepu = d_zistepu * 8 * 65536.0f;
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// we count on FP exceptions being turned off to avoid range problems
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izistep = (int) (d_zistepu * 0x8000 * 0x10000);
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do {
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pdest = (byte *) d_viewbuffer + screenwidth * pspan->v + pspan->u;
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pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
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count = pspan->count;
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if (count <= 0)
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goto NextSpan1;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float) pspan->u;
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dv = (float) pspan->v;
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sdivz = d_sdivzorigin + dv * d_sdivzstepv + du * d_sdivzstepu;
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tdivz = d_tdivzorigin + dv * d_tdivzstepv + du * d_tdivzstepu;
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zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
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z = d_zitable[(int) zi];
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// we count on FP exceptions being turned off to avoid range
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// problems
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izi = (int) (zi * 0x8000);
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s = (int) (sdivz * z) + sadjust;
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if (s > bbextents)
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s = bbextents;
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else if (s < 0)
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s = 0;
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t = (int) (tdivz * z) + tadjust;
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if (t > bbextentt)
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t = bbextentt;
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else if (t < 0)
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t = 0;
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do {
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// calculate s and t at the far end of the span
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if (count >= 8)
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spancount = 8;
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else
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spancount = count;
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count -= spancount;
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if (count) {
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// calculate s/z, t/z, zi->fixed s and t at far end of
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// span, calculate s and t steps across span by shifting
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sdivz += sdivz8stepu;
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tdivz += tdivz8stepu;
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zi += zi8stepu;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps from causing overstepping
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// & running off the texture's edge
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off
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// error on <0 steps
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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} else {
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// calculate s/z, t/z, zi->fixed s and t at last pixel
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// in span (so can't step off polygon), clamp,
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// calculate s and t steps across span by division,
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// biasing steps low so we don't run off the texture
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spancountminus1 = (float) (spancount - 1);
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sdivz += d_sdivzstepu * spancountminus1;
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tdivz += d_tdivzstepu * spancountminus1;
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zi += d_zistepu * 65536.0f * spancountminus1;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps from from causing
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// overstepping & running off the
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// edge of the texture
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off error on
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// <0 steps
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if (spancount > 1) {
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sstep = (snext - s) / (spancount - 1);
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tstep = (tnext - t) / (spancount - 1);
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}
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}
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do {
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btemp = pbase[(s >> 16) + (t >> 16) * cachewidth];
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if (btemp != TRANSPARENT_COLOR) {
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if (*pz <= (izi >> 16)) {
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*pz = izi >> 16;
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*pdest = btemp;
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}
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}
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izi += izistep;
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pdest++;
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pz++;
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s += sstep;
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t += tstep;
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} while (--spancount > 0);
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s = snext;
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t = tnext;
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} while (count > 0);
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NextSpan1:
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pspan++;
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} while (pspan->count != DS_SPAN_LIST_END);
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}
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break;
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case 2:
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{
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int count, spancount, izistep;
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int izi;
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byte *pbase;
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short *pdest;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz8stepu, tdivz8stepu, zi8stepu;
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byte btemp;
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short *pz;
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sstep = 0; // keep compiler happy
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tstep = 0; // ditto
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pbase = (byte *) cacheblock;
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sdivz8stepu = d_sdivzstepu * 8;
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tdivz8stepu = d_tdivzstepu * 8;
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zi8stepu = d_zistepu * 8 * 65536;
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// we count on FP exceptions being turned off to avoid range problems
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izistep = (int) (d_zistepu * 0x8000 * 0x10000);
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do {
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pdest = (short *) d_viewbuffer + screenwidth * pspan->v + pspan->u;
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pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
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count = pspan->count;
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if (count <= 0)
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goto NextSpan2;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float) pspan->u;
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dv = (float) pspan->v;
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sdivz = d_sdivzorigin + dv * d_sdivzstepv + du * d_sdivzstepu;
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tdivz = d_tdivzorigin + dv * d_tdivzstepv + du * d_tdivzstepu;
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zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
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z = d_zitable[(int) zi];
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// we count on FP exceptions being turned off to avoid range
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// problems
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izi = (int) (zi * 0x8000);
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s = (int) (sdivz * z) + sadjust;
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if (s > bbextents)
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s = bbextents;
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else if (s < 0)
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s = 0;
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t = (int) (tdivz * z) + tadjust;
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if (t > bbextentt)
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t = bbextentt;
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else if (t < 0)
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t = 0;
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do {
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// calculate s and t at the far end of the span
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if (count >= 8)
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spancount = 8;
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else
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spancount = count;
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count -= spancount;
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if (count) {
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// calculate s/z, t/z, zi->fixed s and t at far end of
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// span, calculate s and t steps across span by shifting
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sdivz += sdivz8stepu;
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tdivz += tdivz8stepu;
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zi += zi8stepu;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps from causing overstepping
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// & running off the texture's edge
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off error on
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// <0 steps
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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} else {
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// calculate s/z, t/z, zi->fixed s and t at last pixel in
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// span (so can't step off polygon), clamp, calculate s
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// and t steps across span by division, biasing steps
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// low so we don't run off the texture
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spancountminus1 = (float) (spancount - 1);
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sdivz += d_sdivzstepu * spancountminus1;
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tdivz += d_tdivzstepu * spancountminus1;
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zi += d_zistepu * 65536.0f * spancountminus1;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps from from causing
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// overstepping & running off the
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// edge of the texture
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off error on
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// <0 steps
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if (spancount > 1) {
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sstep = (snext - s) / (spancount - 1);
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tstep = (tnext - t) / (spancount - 1);
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}
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}
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do {
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btemp = pbase[(s >> 16) + (t >> 16) * cachewidth];
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if (btemp != TRANSPARENT_COLOR) {
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if (*pz <= (izi >> 16)) {
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*pz = izi >> 16;
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*pdest = d_8to16table[btemp];
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}
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}
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izi += izistep;
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pdest++;
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pz++;
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s += sstep;
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t += tstep;
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} while (--spancount > 0);
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s = snext;
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t = tnext;
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} while (count > 0);
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NextSpan2:
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pspan++;
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} while (pspan->count != DS_SPAN_LIST_END);
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}
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break;
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case 4:
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{
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int count, spancount, izistep;
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int izi;
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byte *pbase;
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int *pdest;
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fixed16_t s, t, snext, tnext, sstep, tstep;
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float sdivz, tdivz, zi, z, du, dv, spancountminus1;
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float sdivz8stepu, tdivz8stepu, zi8stepu;
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byte btemp;
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short *pz;
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sstep = 0; // keep compiler happy
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tstep = 0; // ditto
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pbase = (byte *) cacheblock;
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sdivz8stepu = d_sdivzstepu * 8;
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tdivz8stepu = d_tdivzstepu * 8;
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zi8stepu = d_zistepu * 8 * 65536;
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// we count on FP exceptions being turned off to avoid range problems
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izistep = (int) (d_zistepu * 0x8000 * 0x10000);
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do {
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pdest = (int *) d_viewbuffer + screenwidth * pspan->v + pspan->u;
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pz = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;
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count = pspan->count;
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if (count <= 0)
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goto NextSpan4;
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// calculate the initial s/z, t/z, 1/z, s, and t and clamp
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du = (float) pspan->u;
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dv = (float) pspan->v;
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sdivz = d_sdivzorigin + dv * d_sdivzstepv + du * d_sdivzstepu;
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tdivz = d_tdivzorigin + dv * d_tdivzstepv + du * d_tdivzstepu;
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zi = (d_ziorigin + dv * d_zistepv + du * d_zistepu) * 65536.0f;
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z = d_zitable[(int) zi];
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// we count on FP exceptions being turned off to avoid range
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// problems
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izi = (int) (zi * 0x8000);
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s = (int) (sdivz * z) + sadjust;
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if (s > bbextents)
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s = bbextents;
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else if (s < 0)
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s = 0;
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t = (int) (tdivz * z) + tadjust;
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if (t > bbextentt)
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t = bbextentt;
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else if (t < 0)
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t = 0;
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do {
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// calculate s and t at the far end of the span
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if (count >= 8)
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spancount = 8;
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else
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spancount = count;
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count -= spancount;
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if (count) {
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// calculate s/z, t/z, zi->fixed s and t at far end of
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// span, calculate s and t steps across span by shifting
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sdivz += sdivz8stepu;
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tdivz += tdivz8stepu;
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zi += zi8stepu;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps from causing overstepping
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// & running off the texture's edge
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off error on
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// <0 steps
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sstep = (snext - s) >> 3;
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tstep = (tnext - t) >> 3;
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} else {
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// calculate s/z, t/z, zi->fixed s and t at last pixel in
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// span (so can't step off polygon), clamp, calculate s
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// and t steps across span by division, biasing steps low
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// so we don't run off the texture
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spancountminus1 = (float) (spancount - 1);
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sdivz += d_sdivzstepu * spancountminus1;
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tdivz += d_tdivzstepu * spancountminus1;
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zi += d_zistepu * 65536.0f * spancountminus1;
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z = d_zitable[(int) zi];
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snext = (int) (sdivz * z) + sadjust;
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if (snext > bbextents)
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snext = bbextents;
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else if (snext < 8)
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snext = 8; // prevent round-off error on <0
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// steps fromcausing overstepping
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// & running off the texture's edge
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tnext = (int) (tdivz * z) + tadjust;
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if (tnext > bbextentt)
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tnext = bbextentt;
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else if (tnext < 8)
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tnext = 8; // guard against round-off error on
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// <0 steps
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if (spancount > 1) {
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sstep = (snext - s) / (spancount - 1);
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tstep = (tnext - t) / (spancount - 1);
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}
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}
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do {
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btemp = pbase[(s >> 16) + (t >> 16) * cachewidth];
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if (btemp != TRANSPARENT_COLOR) {
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if (*pz <= (izi >> 16)) {
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*pz = izi >> 16;
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*pdest = d_8to24table[btemp];
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}
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}
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izi += izistep;
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pdest++;
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pz++;
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s += sstep;
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t += tstep;
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} while (--spancount > 0);
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s = snext;
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t = tnext;
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} while (count > 0);
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NextSpan4:
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pspan++;
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} while (pspan->count != DS_SPAN_LIST_END);
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}
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break;
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default:
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Sys_Error("D_SpriteDrawSpans: unsupported r_pixbytes %i",
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r_pixbytes);
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}
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}
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void
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D_SpriteScanLeftEdge (void)
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{
|
|
int i, v, itop, ibottom, lmaxindex;
|
|
emitpoint_t *pvert, *pnext;
|
|
sspan_t *pspan;
|
|
float du, dv, vtop, vbottom, slope;
|
|
fixed16_t u, u_step;
|
|
|
|
pspan = sprite_spans;
|
|
i = minindex;
|
|
if (i == 0)
|
|
i = r_spritedesc.nump;
|
|
|
|
lmaxindex = maxindex;
|
|
if (lmaxindex == 0)
|
|
lmaxindex = r_spritedesc.nump;
|
|
|
|
vtop = ceil (r_spritedesc.pverts[i].v);
|
|
|
|
do {
|
|
pvert = &r_spritedesc.pverts[i];
|
|
pnext = pvert - 1;
|
|
|
|
vbottom = ceil (pnext->v);
|
|
|
|
if (vtop < vbottom) {
|
|
du = pnext->u - pvert->u;
|
|
dv = pnext->v - pvert->v;
|
|
slope = du / dv;
|
|
u_step = (int) (slope * 0x10000);
|
|
// adjust u to ceil the integer portion
|
|
u = (int) ((pvert->u + (slope * (vtop - pvert->v))) * 0x10000) +
|
|
(0x10000 - 1);
|
|
itop = (int) vtop;
|
|
ibottom = (int) vbottom;
|
|
|
|
for (v = itop; v < ibottom; v++) {
|
|
pspan->u = u >> 16;
|
|
pspan->v = v;
|
|
u += u_step;
|
|
pspan++;
|
|
}
|
|
}
|
|
|
|
vtop = vbottom;
|
|
|
|
i--;
|
|
if (i == 0)
|
|
i = r_spritedesc.nump;
|
|
|
|
} while (i != lmaxindex);
|
|
}
|
|
|
|
void
|
|
D_SpriteScanRightEdge (void)
|
|
{
|
|
int i, v, itop, ibottom;
|
|
emitpoint_t *pvert, *pnext;
|
|
sspan_t *pspan;
|
|
float du, dv, vtop, vbottom, slope, uvert, unext, vvert, vnext;
|
|
fixed16_t u, u_step;
|
|
|
|
pspan = sprite_spans;
|
|
i = minindex;
|
|
|
|
vvert = r_spritedesc.pverts[i].v;
|
|
if (vvert < r_refdef.fvrecty_adj)
|
|
vvert = r_refdef.fvrecty_adj;
|
|
if (vvert > r_refdef.fvrectbottom_adj)
|
|
vvert = r_refdef.fvrectbottom_adj;
|
|
|
|
vtop = ceil (vvert);
|
|
|
|
do {
|
|
pvert = &r_spritedesc.pverts[i];
|
|
pnext = pvert + 1;
|
|
|
|
vnext = pnext->v;
|
|
if (vnext < r_refdef.fvrecty_adj)
|
|
vnext = r_refdef.fvrecty_adj;
|
|
if (vnext > r_refdef.fvrectbottom_adj)
|
|
vnext = r_refdef.fvrectbottom_adj;
|
|
|
|
vbottom = ceil (vnext);
|
|
|
|
if (vtop < vbottom) {
|
|
uvert = pvert->u;
|
|
if (uvert < r_refdef.fvrectx_adj)
|
|
uvert = r_refdef.fvrectx_adj;
|
|
if (uvert > r_refdef.fvrectright_adj)
|
|
uvert = r_refdef.fvrectright_adj;
|
|
|
|
unext = pnext->u;
|
|
if (unext < r_refdef.fvrectx_adj)
|
|
unext = r_refdef.fvrectx_adj;
|
|
if (unext > r_refdef.fvrectright_adj)
|
|
unext = r_refdef.fvrectright_adj;
|
|
|
|
du = unext - uvert;
|
|
dv = vnext - vvert;
|
|
slope = du / dv;
|
|
u_step = (int) (slope * 0x10000);
|
|
// adjust u to ceil the integer portion
|
|
u = (int) ((uvert + (slope * (vtop - vvert))) * 0x10000) +
|
|
(0x10000 - 1);
|
|
itop = (int) vtop;
|
|
ibottom = (int) vbottom;
|
|
|
|
for (v = itop; v < ibottom; v++) {
|
|
pspan->count = (u >> 16) - pspan->u;
|
|
u += u_step;
|
|
pspan++;
|
|
}
|
|
}
|
|
|
|
vtop = vbottom;
|
|
vvert = vnext;
|
|
|
|
i++;
|
|
if (i == r_spritedesc.nump)
|
|
i = 0;
|
|
|
|
} while (i != maxindex);
|
|
|
|
pspan->count = DS_SPAN_LIST_END; // mark the end of the span list
|
|
}
|
|
|
|
void
|
|
D_SpriteCalculateGradients (void)
|
|
{
|
|
vec3_t p_normal, p_saxis, p_taxis, p_temp1;
|
|
float distinv;
|
|
|
|
TransformVector (r_spritedesc.vpn, p_normal);
|
|
TransformVector (r_spritedesc.vright, p_saxis);
|
|
TransformVector (r_spritedesc.vup, p_taxis);
|
|
VectorInverse (p_taxis);
|
|
|
|
distinv = 1.0 / (-DotProduct (modelorg, r_spritedesc.vpn));
|
|
distinv = min (distinv, 1.0);
|
|
|
|
d_sdivzstepu = p_saxis[0] * xscaleinv;
|
|
d_tdivzstepu = p_taxis[0] * xscaleinv;
|
|
|
|
d_sdivzstepv = -p_saxis[1] * yscaleinv;
|
|
d_tdivzstepv = -p_taxis[1] * yscaleinv;
|
|
|
|
d_zistepu = p_normal[0] * xscaleinv * distinv;
|
|
d_zistepv = -p_normal[1] * yscaleinv * distinv;
|
|
|
|
d_sdivzorigin = p_saxis[2] - xcenter * d_sdivzstepu -
|
|
ycenter * d_sdivzstepv;
|
|
d_tdivzorigin = p_taxis[2] - xcenter * d_tdivzstepu -
|
|
ycenter * d_tdivzstepv;
|
|
d_ziorigin = p_normal[2] * distinv - xcenter * d_zistepu -
|
|
ycenter * d_zistepv;
|
|
|
|
TransformVector (modelorg, p_temp1);
|
|
|
|
sadjust = ((fixed16_t) (DotProduct (p_temp1, p_saxis) * 0x10000 + 0.5)) -
|
|
(-(cachewidth >> 1) << 16);
|
|
tadjust = ((fixed16_t) (DotProduct (p_temp1, p_taxis) * 0x10000 + 0.5)) -
|
|
(-(sprite_height >> 1) << 16);
|
|
|
|
// -1 (-epsilon) so we never wander off the edge of the texture
|
|
bbextents = (cachewidth << 16) - 1;
|
|
bbextentt = (sprite_height << 16) - 1;
|
|
}
|
|
|
|
void
|
|
D_DrawSprite (void)
|
|
{
|
|
int i, nump;
|
|
float ymin, ymax;
|
|
emitpoint_t *pverts;
|
|
sspan_t spans[MAXHEIGHT + 1];
|
|
|
|
sprite_spans = spans;
|
|
|
|
// find the top and bottom vertices, and make sure there's at least one
|
|
// scan to draw
|
|
ymin = 999999.9;
|
|
ymax = -999999.9;
|
|
pverts = r_spritedesc.pverts;
|
|
|
|
for (i = 0; i < r_spritedesc.nump; i++) {
|
|
if (pverts->v < ymin) {
|
|
ymin = pverts->v;
|
|
minindex = i;
|
|
}
|
|
|
|
if (pverts->v > ymax) {
|
|
ymax = pverts->v;
|
|
maxindex = i;
|
|
}
|
|
|
|
pverts++;
|
|
}
|
|
|
|
ymin = ceil (ymin);
|
|
ymax = ceil (ymax);
|
|
|
|
if (ymin >= ymax)
|
|
return; // doesn't cross any scans at all
|
|
|
|
cachewidth = r_spritedesc.pspriteframe->width;
|
|
sprite_height = r_spritedesc.pspriteframe->height;
|
|
cacheblock = &r_spritedesc.pspriteframe->pixels[0];
|
|
|
|
// copy the first vertex to the last vertex, so we don't have to deal with
|
|
// wrapping
|
|
nump = r_spritedesc.nump;
|
|
pverts = r_spritedesc.pverts;
|
|
pverts[nump] = pverts[0];
|
|
|
|
D_SpriteCalculateGradients ();
|
|
D_SpriteScanLeftEdge ();
|
|
D_SpriteScanRightEdge ();
|
|
D_SpriteDrawSpans (sprite_spans);
|
|
}
|