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- /*
- Copyright (C) 1996-1997 Id Software, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
- See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // gl_mesh.c: triangle model functions
-
- #include "quakedef.h"
-
- /*
- =================================================================
-
- ALIAS MODEL DISPLAY LIST GENERATION
-
- =================================================================
- */
-
- model_t *aliasmodel;
- aliashdr_t *paliashdr;
-
- qboolean used[8192];
-
- // the command list holds counts and s/t values that are valid for
- // every frame
- int commands[8192];
- int numcommands;
-
- // all frames will have their vertexes rearranged and expanded
- // so they are in the order expected by the command list
- int vertexorder[8192];
- int numorder;
-
- int allverts, alltris;
-
- int stripverts[128];
- int striptris[128];
- int stripcount;
-
- /*
- ================
- StripLength
- ================
- */
- int StripLength (int starttri, int startv)
- {
- int m1, m2;
- int j;
- mtriangle_t *last, *check;
- int k;
-
- used[starttri] = 2;
-
- last = &triangles[starttri];
-
- stripverts[0] = last->vertindex[(startv)%3];
- stripverts[1] = last->vertindex[(startv+1)%3];
- stripverts[2] = last->vertindex[(startv+2)%3];
-
- striptris[0] = starttri;
- stripcount = 1;
-
- m1 = last->vertindex[(startv+2)%3];
- m2 = last->vertindex[(startv+1)%3];
-
- // look for a matching triangle
- nexttri:
- for (j=starttri+1, check=&triangles[starttri+1] ; j<pheader->numtris ; j++, check++)
- {
- if (check->facesfront != last->facesfront)
- continue;
- for (k=0 ; k<3 ; k++)
- {
- if (check->vertindex[k] != m1)
- continue;
- if (check->vertindex[ (k+1)%3 ] != m2)
- continue;
-
- // this is the next part of the fan
-
- // if we can't use this triangle, this tristrip is done
- if (used[j])
- goto done;
-
- // the new edge
- if (stripcount & 1)
- m2 = check->vertindex[ (k+2)%3 ];
- else
- m1 = check->vertindex[ (k+2)%3 ];
-
- stripverts[stripcount+2] = check->vertindex[ (k+2)%3 ];
- striptris[stripcount] = j;
- stripcount++;
-
- used[j] = 2;
- goto nexttri;
- }
- }
- done:
-
- // clear the temp used flags
- for (j=starttri+1 ; j<pheader->numtris ; j++)
- if (used[j] == 2)
- used[j] = 0;
-
- return stripcount;
- }
-
- /*
- ===========
- FanLength
- ===========
- */
- int FanLength (int starttri, int startv)
- {
- int m1, m2;
- int j;
- mtriangle_t *last, *check;
- int k;
-
- used[starttri] = 2;
-
- last = &triangles[starttri];
-
- stripverts[0] = last->vertindex[(startv)%3];
- stripverts[1] = last->vertindex[(startv+1)%3];
- stripverts[2] = last->vertindex[(startv+2)%3];
-
- striptris[0] = starttri;
- stripcount = 1;
-
- m1 = last->vertindex[(startv+0)%3];
- m2 = last->vertindex[(startv+2)%3];
-
-
- // look for a matching triangle
- nexttri:
- for (j=starttri+1, check=&triangles[starttri+1] ; j<pheader->numtris ; j++, check++)
- {
- if (check->facesfront != last->facesfront)
- continue;
- for (k=0 ; k<3 ; k++)
- {
- if (check->vertindex[k] != m1)
- continue;
- if (check->vertindex[ (k+1)%3 ] != m2)
- continue;
-
- // this is the next part of the fan
-
- // if we can't use this triangle, this tristrip is done
- if (used[j])
- goto done;
-
- // the new edge
- m2 = check->vertindex[ (k+2)%3 ];
-
- stripverts[stripcount+2] = m2;
- striptris[stripcount] = j;
- stripcount++;
-
- used[j] = 2;
- goto nexttri;
- }
- }
- done:
-
- // clear the temp used flags
- for (j=starttri+1 ; j<pheader->numtris ; j++)
- if (used[j] == 2)
- used[j] = 0;
-
- return stripcount;
- }
-
-
- /*
- ================
- BuildTris
-
- Generate a list of trifans or strips
- for the model, which holds for all frames
- ================
- */
- void BuildTris (void)
- {
- int i, j, k;
- int startv;
- float s, t;
- int len, bestlen, besttype;
- int bestverts[1024];
- int besttris[1024];
- int type;
-
- //
- // build tristrips
- //
- numorder = 0;
- numcommands = 0;
- memset (used, 0, sizeof(used));
- for (i=0 ; i<pheader->numtris ; i++)
- {
- // pick an unused triangle and start the trifan
- if (used[i])
- continue;
-
- bestlen = 0;
- for (type = 0 ; type < 2 ; type++)
- // type = 1;
- {
- for (startv =0 ; startv < 3 ; startv++)
- {
- if (type == 1)
- len = StripLength (i, startv);
- else
- len = FanLength (i, startv);
- if (len > bestlen)
- {
- besttype = type;
- bestlen = len;
- for (j=0 ; j<bestlen+2 ; j++)
- bestverts[j] = stripverts[j];
- for (j=0 ; j<bestlen ; j++)
- besttris[j] = striptris[j];
- }
- }
- }
-
- // mark the tris on the best strip as used
- for (j=0 ; j<bestlen ; j++)
- used[besttris[j]] = 1;
-
- if (besttype == 1)
- commands[numcommands++] = (bestlen+2);
- else
- commands[numcommands++] = -(bestlen+2);
-
- for (j=0 ; j<bestlen+2 ; j++)
- {
- // emit a vertex into the reorder buffer
- k = bestverts[j];
- vertexorder[numorder++] = k;
-
- // emit s/t coords into the commands stream
- s = stverts[k].s;
- t = stverts[k].t;
- if (!triangles[besttris[0]].facesfront && stverts[k].onseam)
- s += pheader->skinwidth / 2; // on back side
- s = (s + 0.5) / pheader->skinwidth;
- t = (t + 0.5) / pheader->skinheight;
-
- *(float *)&commands[numcommands++] = s;
- *(float *)&commands[numcommands++] = t;
- }
- }
-
- commands[numcommands++] = 0; // end of list marker
-
- Con_DPrintf ("%3i tri %3i vert %3i cmd\n", pheader->numtris, numorder, numcommands);
-
- allverts += numorder;
- alltris += pheader->numtris;
- }
-
-
- /*
- ================
- GL_MakeAliasModelDisplayLists
- ================
- */
- void GL_MakeAliasModelDisplayLists (model_t *m, aliashdr_t *hdr)
- {
- int i, j;
- int *cmds;
- trivertx_t *verts;
- char cache[MAX_QPATH], fullpath[MAX_OSPATH];
- FILE *f;
-
- aliasmodel = m;
- paliashdr = hdr; // (aliashdr_t *)Mod_Extradata (m);
-
- //
- // look for a cached version
- //
- strcpy (cache, "glquake/");
- COM_StripExtension (m->name+strlen("progs/"), cache+strlen("glquake/"));
- strcat (cache, ".ms2");
-
- COM_FOpenFile (cache, &f);
- if (f)
- {
- fread (&numcommands, 4, 1, f);
- fread (&numorder, 4, 1, f);
- fread (&commands, numcommands * sizeof(commands[0]), 1, f);
- fread (&vertexorder, numorder * sizeof(vertexorder[0]), 1, f);
- fclose (f);
- }
- else
- {
- //
- // build it from scratch
- //
- Con_Printf ("meshing %s...\n",m->name);
-
- BuildTris (); // trifans or lists
-
- //
- // save out the cached version
- //
- sprintf (fullpath, "%s/%s", com_gamedir, cache);
- f = fopen (fullpath, "wb");
- if (!f) {
- char gldir[MAX_OSPATH];
-
- sprintf (gldir, "%s/glquake", com_gamedir);
- Sys_mkdir (gldir);
- f = fopen (fullpath, "wb");
- }
-
- if (f)
- {
- fwrite (&numcommands, 4, 1, f);
- fwrite (&numorder, 4, 1, f);
- fwrite (&commands, numcommands * sizeof(commands[0]), 1, f);
- fwrite (&vertexorder, numorder * sizeof(vertexorder[0]), 1, f);
- fclose (f);
- }
- }
-
-
- // save the data out
-
- paliashdr->poseverts = numorder;
-
- cmds = Hunk_Alloc (numcommands * 4);
- paliashdr->commands = (byte *)cmds - (byte *)paliashdr;
- memcpy (cmds, commands, numcommands * 4);
-
- verts = Hunk_Alloc (paliashdr->numposes * paliashdr->poseverts
- * sizeof(trivertx_t) );
- paliashdr->posedata = (byte *)verts - (byte *)paliashdr;
- for (i=0 ; i<paliashdr->numposes ; i++)
- for (j=0 ; j<numorder ; j++)
- *verts++ = poseverts[i][vertexorder[j]];
- }
-
-