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#ifndef lint |
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static const char RCSid[] = "$Id: writewfobj.c,v 2.2 2020/04/23 03:19:48 greg Exp $"; |
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#endif |
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/* |
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* writewfobj.c |
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* |
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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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|
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#include "paths.h" |
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#include "rterror.h" |
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#include "objutil.h" |
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|
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/* Delete unreferenced vertices */ |
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static void |
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del_unref_verts(Scene *sc) |
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{ |
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int *vmap; |
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Face *f; |
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int nused, i; |
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/* allocate index map */ |
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if (!sc->nverts) |
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return; |
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i = sc->nverts; |
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if (sc->ntex > i) |
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i = sc->ntex; |
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if (sc->nnorms > i) |
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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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for (i = f->nv; i--; ) |
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if ((f->v[i].vid = vmap[f->v[i].vid]) < 0) |
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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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continue; |
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if (nused != i) |
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memcpy((void *)sc->norm[nused], |
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(void *)sc->norm[i], |
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sizeof(Normal)); |
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vmap[i] = nused++; |
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} |
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if (nused == sc->nnorms) |
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goto skip_norms; |
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sc->norm = (Normal *)erealloc((char *)sc->norm, |
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sizeof(Normal)*(nused+(CHUNKSIZ-1))); |
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sc->nnorms = 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].nid >= 0) |
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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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} |
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|
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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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|
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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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fprintf(fp, "# %d final faces\n", sc->nfaces); |
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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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fputs("#\n\n", fp); |
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} |
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|
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/* Write out vertex lists */ |
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static void |
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write_verts(Scene *sc, FILE *fp) |
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{ |
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int i; |
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|
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fputs("# Vertex positions\n", fp); |
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for (i = 0; i < sc->nverts; i++) |
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fprintf(fp, "v %.12g %.12g %.12g\n", |
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sc->vert[i].p[0], |
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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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for (i = 0; i < sc->ntex; i++) |
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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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fputs("\n# Vertex normals\n", fp); |
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for (i = 0; i < sc->nnorms; i++) |
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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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sc->norm[i][2]); |
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fputc('\n', fp); |
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} |
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|
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/* Write out an object group */ |
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static void |
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write_group(const Scene *sc, int gid, FILE *fp) |
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{ |
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int mid = -1; |
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const Face *f; |
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int j; |
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|
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fprintf(fp, "# Face group\ng %s\n", sc->grpname[gid]); |
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for (f = sc->flist; f != NULL; f = f->next) { |
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if (f->grp != gid) |
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continue; |
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if (f->mat != mid) |
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fprintf(fp, "usemtl %s\n", sc->matname[mid=f->mat]); |
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fputc('f', fp); |
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for (j = 0; j < f->nv; j++) { |
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fprintf(fp, " %d/", f->v[j].vid - sc->nverts); |
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if (f->v[j].tid >= 0) |
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fprintf(fp, "%d/", f->v[j].tid - sc->ntex); |
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else |
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fputc('/', fp); |
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if (f->v[j].nid >= 0) |
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fprintf(fp, "%d", f->v[j].nid - sc->nnorms); |
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} |
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fputc('\n', fp); |
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} |
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fprintf(fp, "# End of face group %s\n\n", sc->grpname[gid]); |
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} |
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|
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/* Write a .OBJ to stream, return # faces written */ |
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int |
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toOBJ(Scene *sc, FILE *fp) |
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{ |
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int i; |
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|
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if (sc == NULL || sc->nfaces <= 0 || fp == NULL) |
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return(0); |
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if (verbose) |
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fputs(" Removing unreferenced vertices\r", stderr); |
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del_unref_verts(sc); /* clean up, first */ |
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if (verbose) |
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fputs(" Writing vertices \r", stderr); |
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write_header(sc, fp); /* write out header */ |
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write_verts(sc, fp); /* write out vertex lists */ |
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/* write out each object group */ |
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for (i = 0; i < sc->ngrps; i++) { |
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if (verbose) |
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fprintf(stderr, " Writing faces %s \r", |
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sc->grpname[i]); |
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write_group(sc, i, fp); |
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} |
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if (fflush(fp) < 0) { |
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error(SYSTEM, "Error flushing .OBJ output"); |
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return(-1); |
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} |
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return(sc->nfaces); |
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} |
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|
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/* Write a .OBJ file, return # faces written */ |
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int |
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writeOBJ(Scene *sc, const char *fspec) |
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{ |
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extern char *progname; |
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FILE *fp; |
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int n; |
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|
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if (sc == NULL || sc->nfaces <= 0 || fspec == NULL || !*fspec) |
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return(0); |
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#if POPEN_SUPPORT |
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if (fspec[0] == '!') { |
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if ((fp = popen(fspec+1, "w")) == NULL) { |
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sprintf(errmsg, "%s: cannot execute", fspec); |
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error(SYSTEM, errmsg); |
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return(-1); |
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} |
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} else |
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#endif |
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if ((fp = fopen(fspec, "w")) == NULL) { |
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sprintf(errmsg, "%s: cannot open for writing", fspec); |
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error(SYSTEM, errmsg); |
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return(-1); |
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} |
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/* start off header */ |
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fprintf(fp, "# Wavefront .OBJ file created by %s\n#\n", progname); |
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n = toOBJ(sc, fp); /* write scene */ |
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#if POPEN_SUPPORT |
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if (fspec[0] == '!') { |
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if (pclose(fp)) { |
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sprintf(errmsg, "%s: error writing to command\n", fspec); |
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error(SYSTEM, errmsg); |
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return(-1); |
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} |
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} else |
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#endif |
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fclose(fp); /* close it (already flushed) */ |
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return(n); |
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} |
