361 lines
7.5 KiB
C
361 lines
7.5 KiB
C
/*
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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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// gl_mesh.c: triangle model functions
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#include "quakedef.h"
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/*
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=================================================================
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ALIAS MODEL DISPLAY LIST GENERATION
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=================================================================
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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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================
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StripLength
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================
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*/
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int 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] ; j<pheader->numtris ; j++, check++)
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{
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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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{
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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->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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===========
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FanLength
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===========
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*/
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int 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] ; j<pheader->numtris ; j++, check++)
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{
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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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{
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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->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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================
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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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*/
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void BuildTris (void)
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{
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int i, j, k;
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int startv;
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mtriangle_t *last, *check;
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int m1, m2;
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int striplength;
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trivertx_t *v;
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mtriangle_t *tv;
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float s, t;
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int index;
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int len, bestlen, besttype;
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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->numtris ; i++)
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{
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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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{
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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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{
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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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{
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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->skinwidth / 2; // on back side
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s = (s + 0.5) / pheader->skinwidth;
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t = (t + 0.5) / pheader->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->numtris, numorder, numcommands);
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allverts += numorder;
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alltris += pheader->numtris;
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}
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/*
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================
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GL_MakeAliasModelDisplayLists
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================
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*/
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void GL_MakeAliasModelDisplayLists (model_t *m, aliashdr_t *hdr)
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{
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int i, j;
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maliasgroup_t *paliasgroup;
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int *cmds;
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trivertx_t *verts;
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char cache[MAX_QPATH], fullpath[MAX_OSPATH], *c;
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FILE *f;
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int len;
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byte *data;
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aliasmodel = m;
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paliashdr = hdr; // (aliashdr_t *)Mod_Extradata (m);
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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/"), cache+strlen("glquake/"));
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strcat (cache, ".ms2");
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COM_FOpenFile (cache, &f);
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if (f)
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{
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fread (&numcommands, 4, 1, f);
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fread (&numorder, 4, 1, f);
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fread (&commands, numcommands * sizeof(commands[0]), 1, f);
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fread (&vertexorder, numorder * sizeof(vertexorder[0]), 1, f);
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fclose (f);
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}
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else
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{
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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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sprintf (fullpath, "%s/%s", com_gamedir, cache);
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f = fopen (fullpath, "wb");
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if (f)
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{
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fwrite (&numcommands, 4, 1, f);
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fwrite (&numorder, 4, 1, f);
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fwrite (&commands, numcommands * sizeof(commands[0]), 1, f);
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fwrite (&vertexorder, numorder * sizeof(vertexorder[0]), 1, f);
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fclose (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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