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greg |
2.1 |
#ifndef lint
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greg |
2.2 |
static const char RCSid[] = "$Id: writewfobj.c,v 2.1 2020/03/30 18:28:35 greg Exp $";
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| 3 |
greg |
2.1 |
#endif
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/*
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| 5 |
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* writewfobj.c
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*
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| 7 |
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* Routines for writing out Wavefront file.
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*
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* Created by Greg Ward on Thu Feb 12 2004.
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*/
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greg |
2.2 |
#include "paths.h"
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greg |
2.1 |
#include "rterror.h"
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| 14 |
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#include "objutil.h"
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| 15 |
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| 16 |
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/* Delete unreferenced vertices */
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static void
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| 18 |
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del_unref_verts(Scene *sc)
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{
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| 20 |
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int *vmap;
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Face *f;
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| 22 |
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int nused, i;
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/* allocate index map */
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| 24 |
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if (!sc->nverts)
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| 25 |
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return;
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| 26 |
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i = sc->nverts;
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| 27 |
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if (sc->ntex > i)
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| 28 |
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i = sc->ntex;
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| 29 |
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if (sc->nnorms > i)
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| 30 |
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i = sc->nnorms;
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vmap = (int *)emalloc(sizeof(int)*i);
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/* remap positions */
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for (i = nused = 0; i < sc->nverts; i++) {
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if (sc->vert[i].vflist == NULL) {
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vmap[i] = -1;
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continue;
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}
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if (nused != i)
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sc->vert[nused] = sc->vert[i];
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vmap[i] = nused++;
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}
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if (nused == sc->nverts)
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goto skip_pos;
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sc->vert = (Vertex *)erealloc((char *)sc->vert,
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sizeof(Vertex)*(nused+(CHUNKSIZ-1)));
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sc->nverts = nused;
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for (f = sc->flist; f != NULL; f = f->next)
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| 48 |
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for (i = f->nv; i--; )
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| 49 |
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if ((f->v[i].vid = vmap[f->v[i].vid]) < 0)
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| 50 |
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error(CONSISTENCY,
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"Link error in del_unref_verts()");
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skip_pos:
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/* remap texture coord's */
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if (!sc->ntex)
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goto skip_tex;
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memset((void *)vmap, 0, sizeof(int)*sc->ntex);
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for (f = sc->flist; f != NULL; f = f->next)
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for (i = f->nv; i--; )
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if (f->v[i].tid >= 0)
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vmap[f->v[i].tid] = 1;
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for (i = nused = 0; i < sc->ntex; i++) {
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if (!vmap[i])
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continue;
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if (nused != i)
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sc->tex[nused] = sc->tex[i];
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vmap[i] = nused++;
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}
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if (nused == sc->ntex)
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goto skip_tex;
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sc->tex = (TexCoord *)erealloc((char *)sc->tex,
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sizeof(TexCoord)*(nused+(CHUNKSIZ-1)));
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sc->ntex = nused;
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for (f = sc->flist; f != NULL; f = f->next)
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for (i = f->nv; i--; )
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if (f->v[i].tid >= 0)
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f->v[i].tid = vmap[f->v[i].tid];
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skip_tex:
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/* remap normals */
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if (!sc->nnorms)
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goto skip_norms;
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memset((void *)vmap, 0, sizeof(int)*sc->nnorms);
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for (f = sc->flist; f != NULL; f = f->next)
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for (i = f->nv; i--; )
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if (f->v[i].nid >= 0)
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vmap[f->v[i].nid] = 1;
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for (i = nused = 0; i < sc->nnorms; i++) {
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if (!vmap[i])
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| 88 |
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continue;
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| 89 |
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if (nused != i)
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| 90 |
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memcpy((void *)sc->norm[nused],
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| 91 |
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(void *)sc->norm[i],
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| 92 |
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sizeof(Normal));
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| 93 |
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vmap[i] = nused++;
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}
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| 95 |
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if (nused == sc->nnorms)
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| 96 |
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goto skip_norms;
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sc->norm = (Normal *)erealloc((char *)sc->norm,
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| 98 |
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sizeof(Normal)*(nused+(CHUNKSIZ-1)));
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| 99 |
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sc->nnorms = nused;
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| 100 |
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for (f = sc->flist; f != NULL; f = f->next)
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| 101 |
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for (i = f->nv; i--; )
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| 102 |
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if (f->v[i].nid >= 0)
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| 103 |
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f->v[i].nid = vmap[f->v[i].nid];
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skip_norms:
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/* clean up */
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efree((char *)vmap);
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| 107 |
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}
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| 108 |
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| 109 |
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/* Write out header comments */
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static void
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write_header(Scene *sc, FILE *fp)
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{
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int i;
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| 114 |
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| 115 |
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for (i = 0; i < sc->ndescr; i++)
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fprintf(fp, "# %s\n", sc->descr[i]);
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fputs("#\n", fp);
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| 118 |
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fprintf(fp, "# %d final faces\n", sc->nfaces);
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| 119 |
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fprintf(fp,
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"#\t%d vertices, %d texture coordinates, %d surface normals\n",
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sc->nverts, sc->ntex, sc->nnorms);
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| 122 |
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fputs("#\n\n", fp);
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}
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| 125 |
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/* Write out vertex lists */
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static void
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| 127 |
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write_verts(Scene *sc, FILE *fp)
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| 128 |
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{
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| 129 |
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int i;
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| 130 |
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| 131 |
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fputs("# Vertex positions\n", fp);
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for (i = 0; i < sc->nverts; i++)
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| 133 |
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fprintf(fp, "v %.12g %.12g %.12g\n",
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sc->vert[i].p[0],
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| 135 |
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sc->vert[i].p[1],
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sc->vert[i].p[2]);
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fputs("\n# Vertex texture coordinates\n", fp);
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| 138 |
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for (i = 0; i < sc->ntex; i++)
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| 139 |
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fprintf(fp, "vt %.6g %.6g\n",
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sc->tex[i].u, sc->tex[i].v);
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| 141 |
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fputs("\n# Vertex normals\n", fp);
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| 142 |
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for (i = 0; i < sc->nnorms; i++)
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| 143 |
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fprintf(fp, "vn %.6f %.6f %.6f\n",
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sc->norm[i][0],
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sc->norm[i][1],
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| 146 |
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sc->norm[i][2]);
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| 147 |
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fputc('\n', fp);
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| 148 |
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}
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| 149 |
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| 150 |
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/* Write out an object group */
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| 151 |
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static void
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write_group(const Scene *sc, int gid, FILE *fp)
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| 153 |
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{
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| 154 |
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int mid = -1;
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| 155 |
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const Face *f;
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| 156 |
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int j;
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| 157 |
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| 158 |
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fprintf(fp, "# Face group\ng %s\n", sc->grpname[gid]);
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| 159 |
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for (f = sc->flist; f != NULL; f = f->next) {
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| 160 |
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if (f->grp != gid)
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continue;
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| 162 |
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if (f->mat != mid)
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| 163 |
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fprintf(fp, "usemtl %s\n", sc->matname[mid=f->mat]);
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| 164 |
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fputc('f', fp);
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| 165 |
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for (j = 0; j < f->nv; j++) {
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| 166 |
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fprintf(fp, " %d/", f->v[j].vid - sc->nverts);
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| 167 |
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if (f->v[j].tid >= 0)
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| 168 |
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fprintf(fp, "%d/", f->v[j].tid - sc->ntex);
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| 169 |
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else
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| 170 |
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fputc('/', fp);
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| 171 |
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if (f->v[j].nid >= 0)
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| 172 |
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fprintf(fp, "%d", f->v[j].nid - sc->nnorms);
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| 173 |
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}
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| 174 |
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fputc('\n', fp);
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| 175 |
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}
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| 176 |
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fprintf(fp, "# End of face group %s\n\n", sc->grpname[gid]);
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| 177 |
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}
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| 178 |
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| 179 |
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/* Write a .OBJ to stream, return # faces written */
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| 180 |
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int
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| 181 |
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toOBJ(Scene *sc, FILE *fp)
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| 182 |
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{
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| 183 |
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int i;
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| 184 |
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| 185 |
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if (sc == NULL || sc->nfaces <= 0 || fp == NULL)
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| 186 |
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return(0);
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| 187 |
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if (verbose)
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| 188 |
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fputs(" Removing unreferenced vertices\r", stderr);
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| 189 |
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del_unref_verts(sc); /* clean up, first */
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| 190 |
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if (verbose)
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| 191 |
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fputs(" Writing vertices \r", stderr);
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| 192 |
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write_header(sc, fp); /* write out header */
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| 193 |
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write_verts(sc, fp); /* write out vertex lists */
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| 194 |
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/* write out each object group */
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| 195 |
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for (i = 0; i < sc->ngrps; i++) {
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| 196 |
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if (verbose)
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| 197 |
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fprintf(stderr, " Writing faces %s \r",
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| 198 |
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sc->grpname[i]);
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| 199 |
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write_group(sc, i, fp);
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| 200 |
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}
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| 201 |
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if (fflush(fp) < 0) {
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| 202 |
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error(SYSTEM, "Error flushing .OBJ output");
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| 203 |
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return(-1);
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| 204 |
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}
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| 205 |
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return(sc->nfaces);
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| 206 |
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}
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| 207 |
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| 208 |
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/* Write a .OBJ file, return # faces written */
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| 209 |
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int
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| 210 |
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writeOBJ(Scene *sc, const char *fspec)
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| 211 |
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{
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| 212 |
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extern char *progname;
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| 213 |
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FILE *fp;
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| 214 |
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int n;
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| 215 |
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| 216 |
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if (sc == NULL || sc->nfaces <= 0 || fspec == NULL || !*fspec)
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| 217 |
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return(0);
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| 218 |
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#if POPEN_SUPPORT
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| 219 |
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if (fspec[0] == '!') {
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| 220 |
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if ((fp = popen(fspec+1, "w")) == NULL) {
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| 221 |
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sprintf(errmsg, "%s: cannot execute", fspec);
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| 222 |
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error(SYSTEM, errmsg);
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| 223 |
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return(0);
|
| 224 |
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}
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| 225 |
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} else
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| 226 |
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#endif
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| 227 |
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if ((fp = fopen(fspec, "w")) == NULL) {
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| 228 |
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sprintf(errmsg, "%s: cannot open for writing", fspec);
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| 229 |
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error(SYSTEM, errmsg);
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| 230 |
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return(0);
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| 231 |
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}
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| 232 |
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/* start off header */
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| 233 |
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fprintf(fp, "# Wavefront .OBJ file created by %s\n#\n", progname);
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| 234 |
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n = toOBJ(sc, fp); /* write scene */
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| 235 |
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#if POPEN_SUPPORT
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| 236 |
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if (fspec[0] == '!')
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| 237 |
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pclose(fp);
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| 238 |
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else
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| 239 |
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#endif
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| 240 |
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fclose(fp); /* close it */
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| 241 |
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return(n);
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| 242 |
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}
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