mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-05 20:50:43 +00:00
412 lines
9.5 KiB
C
412 lines
9.5 KiB
C
/*
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gl_mesh.c
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gl_mesh.c: triangle model functions
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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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$Id$
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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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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <stdio.h>
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#include "QF/console.h"
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#include "QF/compat.h"
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#include "QF/mdfour.h"
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#include "QF/model.h"
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#include "QF/quakefs.h"
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/*
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ALIAS MODEL DISPLAY LIST GENERATION
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*/
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model_t *aliasmodel;
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aliashdr_t *paliashdr;
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qboolean used[8192];
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// the command list holds counts and s/t values that are valid for
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// every frame
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int commands[8192];
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int numcommands;
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// all frames will have their vertexes rearranged and expanded
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// so they are in the order expected by the command list
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int vertexorder[8192];
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int numorder;
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int allverts, alltris;
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int stripverts[128];
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int striptris[128];
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int stripcount;
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/*
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StripLength
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*/
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int
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StripLength (int starttri, int startv)
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{
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int m1, m2;
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int j;
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mtriangle_t *last, *check;
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int k;
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used[starttri] = 2;
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last = &triangles[starttri];
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stripverts[0] = last->vertindex[(startv) % 3];
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stripverts[1] = last->vertindex[(startv + 1) % 3];
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stripverts[2] = last->vertindex[(startv + 2) % 3];
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striptris[0] = starttri;
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stripcount = 1;
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m1 = last->vertindex[(startv + 2) % 3];
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m2 = last->vertindex[(startv + 1) % 3];
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// look for a matching triangle
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nexttri:
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for (j = starttri + 1, check = &triangles[starttri + 1];
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j < pheader->mdl.numtris; j++, check++) {
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if (check->facesfront != last->facesfront)
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continue;
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for (k = 0; k < 3; k++) {
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if (check->vertindex[k] != m1)
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continue;
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if (check->vertindex[(k + 1) % 3] != m2)
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continue;
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// this is the next part of the fan
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// if we can't use this triangle, this tristrip is done
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if (used[j])
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goto done;
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// the new edge
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if (stripcount & 1)
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m2 = check->vertindex[(k + 2) % 3];
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else
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m1 = check->vertindex[(k + 2) % 3];
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stripverts[stripcount + 2] = check->vertindex[(k + 2) % 3];
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striptris[stripcount] = j;
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stripcount++;
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used[j] = 2;
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goto nexttri;
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}
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}
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done:
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// clear the temp used flags
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for (j = starttri + 1; j < pheader->mdl.numtris; j++)
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if (used[j] == 2)
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used[j] = 0;
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return stripcount;
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}
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/*
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FanLength
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*/
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int
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FanLength (int starttri, int startv)
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{
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int m1, m2;
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int j;
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mtriangle_t *last, *check;
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int k;
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used[starttri] = 2;
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last = &triangles[starttri];
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stripverts[0] = last->vertindex[(startv) % 3];
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stripverts[1] = last->vertindex[(startv + 1) % 3];
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stripverts[2] = last->vertindex[(startv + 2) % 3];
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striptris[0] = starttri;
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stripcount = 1;
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m1 = last->vertindex[(startv + 0) % 3];
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m2 = last->vertindex[(startv + 2) % 3];
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// look for a matching triangle
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nexttri:
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for (j = starttri + 1, check = &triangles[starttri + 1];
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j < pheader->mdl.numtris; j++, check++) {
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if (check->facesfront != last->facesfront)
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continue;
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for (k = 0; k < 3; k++) {
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if (check->vertindex[k] != m1)
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continue;
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if (check->vertindex[(k + 1) % 3] != m2)
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continue;
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// this is the next part of the fan
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// if we can't use this triangle, this tristrip is done
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if (used[j])
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goto done;
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// the new edge
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m2 = check->vertindex[(k + 2) % 3];
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stripverts[stripcount + 2] = m2;
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striptris[stripcount] = j;
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stripcount++;
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used[j] = 2;
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goto nexttri;
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}
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}
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done:
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// clear the temp used flags
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for (j = starttri + 1; j < pheader->mdl.numtris; j++)
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if (used[j] == 2)
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used[j] = 0;
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return stripcount;
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}
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/*
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BuildTris
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Generate a list of trifans or strips
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for the model, which holds for all frames
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*/
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void
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BuildTris (void)
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{
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int i, j, k;
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int startv;
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float s, t;
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int len, bestlen, besttype = 0;
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int bestverts[1024];
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int besttris[1024];
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int type;
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//
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// build tristrips
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//
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numorder = 0;
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numcommands = 0;
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memset (used, 0, sizeof (used));
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for (i = 0; i < pheader->mdl.numtris; i++) {
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// pick an unused triangle and start the trifan
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if (used[i])
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continue;
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bestlen = 0;
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for (type = 0; type < 2; type++)
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// type = 1;
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{
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for (startv = 0; startv < 3; startv++) {
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if (type == 1)
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len = StripLength (i, startv);
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else
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len = FanLength (i, startv);
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if (len > bestlen) {
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besttype = type;
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bestlen = len;
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for (j = 0; j < bestlen + 2; j++)
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bestverts[j] = stripverts[j];
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for (j = 0; j < bestlen; j++)
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besttris[j] = striptris[j];
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}
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}
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}
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// mark the tris on the best strip as used
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for (j = 0; j < bestlen; j++)
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used[besttris[j]] = 1;
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if (besttype == 1)
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commands[numcommands++] = (bestlen + 2);
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else
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commands[numcommands++] = -(bestlen + 2);
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for (j = 0; j < bestlen + 2; j++) {
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// emit a vertex into the reorder buffer
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k = bestverts[j];
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vertexorder[numorder++] = k;
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// emit s/t coords into the commands stream
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s = stverts[k].s;
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t = stverts[k].t;
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if (!triangles[besttris[0]].facesfront && stverts[k].onseam)
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s += pheader->mdl.skinwidth / 2; // on back side
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s = (s + 0.5) / pheader->mdl.skinwidth;
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t = (t + 0.5) / pheader->mdl.skinheight;
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*(float *) &commands[numcommands++] = s;
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*(float *) &commands[numcommands++] = t;
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}
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}
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commands[numcommands++] = 0; // end of list marker
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Con_DPrintf ("%3i tri %3i vert %3i cmd\n", pheader->mdl.numtris, numorder,
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numcommands);
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allverts += numorder;
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alltris += pheader->mdl.numtris;
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}
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/*
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GL_MakeAliasModelDisplayLists
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*/
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void
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GL_MakeAliasModelDisplayLists (model_t *m, aliashdr_t *hdr, void *_m, int _s)
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{
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int i, j;
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int *cmds;
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trivertx_t *verts;
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char cache[MAX_QPATH], fullpath[MAX_OSPATH];
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QFile *f;
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unsigned char model_digest[MDFOUR_DIGEST_BYTES];
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unsigned char mesh_digest[MDFOUR_DIGEST_BYTES];
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qboolean remesh = true;
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aliasmodel = m;
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paliashdr = hdr; // (aliashdr_t *)Mod_Extradata (m);
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mdfour (model_digest, (unsigned char *) _m, _s);
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//
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// look for a cached version
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//
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strcpy (cache, "glquake/");
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COM_StripExtension (m->name + strlen ("progs/"),
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cache + strlen ("glquake/"));
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strncat (cache, ".ms2", sizeof (cache) - strlen (cache));
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COM_FOpenFile (cache, &f);
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if (f) {
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unsigned char d1[MDFOUR_DIGEST_BYTES];
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unsigned char d2[MDFOUR_DIGEST_BYTES];
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struct mdfour md;
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int c[8192];
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int nc;
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int vo[8192];
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int no;
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memset (d1, 0, sizeof (d1));
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memset (d2, 0, sizeof (d2));
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Qread (f, &nc, 4);
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Qread (f, &no, 4);
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if (nc <= 8192 && no <= 8192) {
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Qread (f, &c, nc * sizeof (c[0]));
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Qread (f, &vo, no * sizeof (vo[0]));
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Qread (f, d1, MDFOUR_DIGEST_BYTES);
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Qread (f, d2, MDFOUR_DIGEST_BYTES);
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Qclose (f);
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mdfour_begin (&md);
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mdfour_update (&md, (unsigned char *) &nc, 4);
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mdfour_update (&md, (unsigned char *) &no, 4);
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mdfour_update (&md, (unsigned char *) &c, nc * sizeof (c[0]));
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mdfour_update (&md, (unsigned char *) &vo, no * sizeof (vo[0]));
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mdfour_update (&md, d1, MDFOUR_DIGEST_BYTES);
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mdfour_result (&md, mesh_digest);
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if (memcmp (d2, mesh_digest, MDFOUR_DIGEST_BYTES) == 0
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&& memcmp (d1, model_digest, MDFOUR_DIGEST_BYTES) == 0) {
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remesh = false;
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numcommands = nc;
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numorder = no;
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memcpy (commands, c, numcommands * sizeof (c[0]));
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memcpy (vertexorder, vo, numorder * sizeof (vo[0]));
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}
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}
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}
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if (remesh) {
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//
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// build it from scratch
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//
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Con_Printf ("meshing %s...\n", m->name);
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BuildTris (); // trifans or lists
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//
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// save out the cached version
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//
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snprintf (fullpath, sizeof (fullpath), "%s/%s", com_gamedir, cache);
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f = Qopen (fullpath, "wbz9");
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if (!f) {
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COM_CreatePath (fullpath);
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f = Qopen (fullpath, "wb");
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}
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if (f) {
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struct mdfour md;
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mdfour_begin (&md);
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mdfour_update (&md, (unsigned char *) &numcommands, 4);
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mdfour_update (&md, (unsigned char *) &numorder, 4);
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mdfour_update (&md, (unsigned char *) &commands,
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numcommands * sizeof (commands[0]));
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mdfour_update (&md, (unsigned char *) &vertexorder,
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numorder * sizeof (vertexorder[0]));
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mdfour_update (&md, model_digest, MDFOUR_DIGEST_BYTES);
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mdfour_result (&md, mesh_digest);
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Qwrite (f, &numcommands, 4);
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Qwrite (f, &numorder, 4);
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Qwrite (f, &commands, numcommands * sizeof (commands[0]));
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Qwrite (f, &vertexorder, numorder * sizeof (vertexorder[0]));
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Qwrite (f, model_digest, MDFOUR_DIGEST_BYTES);
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Qwrite (f, mesh_digest, MDFOUR_DIGEST_BYTES);
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Qclose (f);
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}
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}
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// save the data out
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paliashdr->poseverts = numorder;
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cmds = Hunk_Alloc (numcommands * 4);
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paliashdr->commands = (byte *) cmds - (byte *) paliashdr;
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memcpy (cmds, commands, numcommands * 4);
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verts = Hunk_Alloc (paliashdr->numposes * paliashdr->poseverts
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* sizeof (trivertx_t));
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paliashdr->posedata = (byte *) verts - (byte *) paliashdr;
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for (i = 0; i < paliashdr->numposes; i++)
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for (j = 0; j < numorder; j++)
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*verts++ = poseverts[i][vertexorder[j]];
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}
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