git.mutantstargoat.com Git - vrtris/blob - src/meshload.c

   1 #if 0
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <ctype.h>
   5 #include <assert.h>
   6 #include "mesh.h"
   7 #include "dynarr.h"
   8 #include "rbtree.h"
   9 #include "util.h"
  10
  11 struct vertex_pos_color {
  12         float x, y, z;
  13         float r, g, b, a;
  14 };
  15
  16 struct facevertex {
  17         int vidx, tidx, nidx;
  18 };
  19
  20 static char *clean_line(char *s);
  21 static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn);
  22 static int cmp_facevert(const void *ap, const void *bp);
  23 static void free_rbnode_key(struct rbnode *n, void *cls);
  24
  25 /* merge of different indices per attribute happens during face processing.
  26  *
  27  * A triplet of (vertex index/texcoord index/normal index) is used as the key
  28  * to search in a balanced binary search tree for vertex buffer index assigned
  29  * to the same triplet if it has been encountered before. That index is
  30  * appended to the index buffer.
  31  *
  32  * If a particular triplet has not been encountered before, a new g3d_vertex is
  33  * appended to the vertex buffer. The index of this new vertex is appended to
  34  * the index buffer, and also inserted into the tree for future searches.
  35  */
  36 int load_mesh(struct g3d_mesh *mesh, const char *fname)
  37 {
  38         int i, line_num = 0, result = -1;
  39         int found_quad = 0;
  40         FILE *fp = 0;
  41         char buf[256];
  42         struct vertex_pos_color *varr = 0;
  43         vec3_t *narr = 0;
  44         vec2_t *tarr = 0;
  45         struct rbtree *rbtree = 0;
  46
  47         if(!(fp = fopen(fname, "rb"))) {
  48                 fprintf(stderr, "load_mesh: failed to open file: %s\n", fname);
  49                 goto err;
  50         }
  51
  52         if(!(rbtree = rb_create(cmp_facevert))) {
  53                 fprintf(stderr, "load_mesh: failed to create facevertex binary search tree\n");
  54                 goto err;
  55         }
  56         rb_set_delete_func(rbtree, free_rbnode_key, 0);
  57
  58         if(!(mesh->varr = dynarr_alloc(0, sizeof *mesh->varr)) ||
  59                         !(mesh->iarr = dynarr_alloc(0, sizeof *mesh->iarr))) {
  60                 fprintf(stderr, "load_mesh: failed to allocate resizable mesh arrays\n");
  61                 goto err;
  62         }
  63         if(!(varr = dynarr_alloc(0, sizeof *varr)) ||
  64                         !(narr = dynarr_alloc(0, sizeof *narr)) ||
  65                         !(tarr = dynarr_alloc(0, sizeof *tarr))) {
  66                 fprintf(stderr, "load_mesh: failed to allocate resizable vertex array\n");
  67                 goto err;
  68         }
  69
  70         while(fgets(buf, sizeof buf, fp)) {
  71                 char *line = clean_line(buf);
  72                 ++line_num;
  73
  74                 if(!*line) continue;
  75
  76                 switch(line[0]) {
  77                 case 'v':
  78                         if(isspace(line[1])) {
  79                                 /* vertex */
  80                                 struct vertex_pos_color v;
  81                                 int num;
  82
  83                                 num = sscanf(line + 2, "%f %f %f %f %f %f %f", &v.x, &v.y, &v.z, &v.r, &v.g, &v.b, &v.a);
  84                                 if(num < 3) {
  85                                         fprintf(stderr, "%s:%d: invalid vertex definition: \"%s\"\n", fname, line_num, line);
  86                                         goto err;
  87                                 }
  88                                 switch(num) {
  89                                 case 3:
  90                                         v.r = 1.0f;
  91                                 case 4:
  92                                         v.g = 1.0f;
  93                                 case 5:
  94                                         v.b = 1.0f;
  95                                 case 6:
  96                                         v.a = 1.0f;
  97                                 }
  98                                 if(!(varr = dynarr_push(varr, &v))) {
  99                                         fprintf(stderr, "load_mesh: failed to resize vertex buffer\n");
 100                                         goto err;
 101                                 }
 102
 103                         } else if(line[1] == 't' && isspace(line[2])) {
 104                                 /* texcoord */
 105                                 vec2_t tc;
 106                                 if(sscanf(line + 3, "%f %f", &tc.x, &tc.y) != 2) {
 107                                         fprintf(stderr, "%s:%d: invalid texcoord definition: \"%s\"\n", fname, line_num, line);
 108                                         goto err;
 109                                 }
 110                                 if(!(tarr = dynarr_push(tarr, &tc))) {
 111                                         fprintf(stderr, "load_mesh: failed to resize texcoord buffer\n");
 112                                         goto err;
 113                                 }
 114
 115                         } else if(line[1] == 'n' && isspace(line[2])) {
 116                                 /* normal */
 117                                 vec3_t norm;
 118                                 if(sscanf(line + 3, "%f %f %f", &norm.x, &norm.y, &norm.z) != 3) {
 119                                         fprintf(stderr, "%s:%d: invalid normal definition: \"%s\"\n", fname, line_num, line);
 120                                         goto err;
 121                                 }
 122                                 if(!(narr = dynarr_push(narr, &norm))) {
 123                                         fprintf(stderr, "load_mesh: failed to resize normal buffer\n");
 124                                         goto err;
 125                                 }
 126                         }
 127                         break;
 128
 129                 case 'f':
 130                         if(isspace(line[1])) {
 131                                 /* face */
 132                                 char *ptr = line + 2;
 133                                 struct facevertex fv;
 134                                 struct rbnode *node;
 135                                 int vsz = dynarr_size(varr);
 136                                 int tsz = dynarr_size(tarr);
 137                                 int nsz = dynarr_size(narr);
 138
 139                                 for(i=0; i<4; i++) {
 140                                         if(!(ptr = parse_face_vert(ptr, &fv, vsz, tsz, nsz))) {
 141                                                 if(i < 3 || found_quad) {
 142                                                         fprintf(stderr, "%s:%d: invalid face definition: \"%s\"\n", fname, line_num, line);
 143                                                         goto err;
 144                                                 } else {
 145                                                         break;
 146                                                 }
 147                                         }
 148
 149                                         if((node = rb_find(rbtree, &fv))) {
 150                                                 uint16_t idx = (int)(intptr_t)node->data;
 151                                                 if(!(mesh->iarr = dynarr_push(mesh->iarr, &idx))) {
 152                                                         fprintf(stderr, "load_mesh: failed to resize index array\n");
 153                                                         goto err;
 154                                                 }
 155                                         } else {
 156                                                 uint16_t newidx = dynarr_size(mesh->varr);
 157                                                 struct g3d_vertex v;
 158                                                 struct facevertex *newfv;
 159
 160                                                 v.x = varr[fv.vidx].x;
 161                                                 v.y = varr[fv.vidx].y;
 162                                                 v.z = varr[fv.vidx].z;
 163                                                 v.w = 1.0f;
 164                                                 v.r = cround64(varr[fv.vidx].r * 255.0);
 165                                                 v.g = cround64(varr[fv.vidx].g * 255.0);
 166                                                 v.b = cround64(varr[fv.vidx].b * 255.0);
 167                                                 v.a = cround64(varr[fv.vidx].a * 255.0);
 168                                                 if(fv.tidx >= 0) {
 169                                                         v.u = tarr[fv.tidx].x;
 170                                                         v.v = tarr[fv.tidx].y;
 171                                                 } else {
 172                                                         v.u = v.x;
 173                                                         v.v = v.y;
 174                                                 }
 175                                                 if(fv.nidx >= 0) {
 176                                                         v.nx = narr[fv.nidx].x;
 177                                                         v.ny = narr[fv.nidx].y;
 178                                                         v.nz = narr[fv.nidx].z;
 179                                                 } else {
 180                                                         v.nx = v.ny = 0.0f;
 181                                                         v.nz = 1.0f;
 182                                                 }
 183
 184                                                 if(!(mesh->varr = dynarr_push(mesh->varr, &v))) {
 185                                                         fprintf(stderr, "load_mesh: failed to resize combined vertex array\n");
 186                                                         goto err;
 187                                                 }
 188                                                 if(!(mesh->iarr = dynarr_push(mesh->iarr, &newidx))) {
 189                                                         fprintf(stderr, "load_mesh: failed to resize index array\n");
 190                                                         goto err;
 191                                                 }
 192
 193                                                 if((newfv = malloc(sizeof *newfv))) {
 194                                                         *newfv = fv;
 195                                                 }
 196                                                 if(!newfv || rb_insert(rbtree, newfv, (void*)(intptr_t)newidx) == -1) {
 197                                                         fprintf(stderr, "load_mesh: failed to insert facevertex to the binary search tree\n");
 198                                                         goto err;
 199                                                 }
 200                                         }
 201                                 }
 202                                 if(i > 3) found_quad = 1;
 203                         }
 204                         break;
 205
 206                 default:
 207                         break;
 208                 }
 209         }
 210
 211         mesh->prim = found_quad ? G3D_QUADS : G3D_TRIANGLES;
 212         mesh->vcount = dynarr_size(mesh->varr);
 213         mesh->icount = dynarr_size(mesh->iarr);
 214         mesh->varr = dynarr_finalize(mesh->varr);
 215         mesh->iarr = dynarr_finalize(mesh->iarr);
 216         result = 0;     /* success */
 217
 218         printf("loaded %s mesh: %s: %d vertices, %d faces\n", found_quad ? "quad" : "triangle",
 219                         fname, mesh->vcount, mesh->icount / mesh->prim);
 220
 221 err:
 222         if(fp) fclose(fp);
 223         dynarr_free(varr);
 224         dynarr_free(narr);
 225         dynarr_free(tarr);
 226         if(result == -1) {
 227                 dynarr_free(mesh->varr);
 228                 dynarr_free(mesh->iarr);
 229         }
 230         rb_free(rbtree);
 231         return result;
 232 }
 233
 234 int save_mesh(struct g3d_mesh *mesh, const char *fname)
 235 {
 236         int i, fvcount;
 237         FILE *fp;
 238
 239         if(!(fp = fopen(fname, "wb"))) {
 240                 fprintf(stderr, "save_mesh: failed to open %s for writing\n", fname);
 241                 return -1;
 242         }
 243         fprintf(fp, "# Wavefront OBJ file shoved in your FACE by Mindlapse. Deal with it\n");
 244
 245         for(i=0; i<mesh->vcount; i++) {
 246                 struct g3d_vertex *v = mesh->varr + i;
 247                 fprintf(fp, "v %f %f %f %f %f %f %f\n", v->x, v->y, v->z, v->r / 255.0f, v->g / 255.0f,
 248                                 v->b / 255.0f, v->a / 255.0f);
 249         }
 250         for(i=0; i<mesh->vcount; i++) {
 251                 fprintf(fp, "vn %f %f %f\n", mesh->varr[i].nx, mesh->varr[i].ny, mesh->varr[i].nz);
 252         }
 253         for(i=0; i<mesh->vcount; i++) {
 254                 fprintf(fp, "vt %f %f\n", mesh->varr[i].u, mesh->varr[i].v);
 255         }
 256
 257         fvcount = mesh->prim;
 258         for(i=0; i<mesh->icount; i++) {
 259                 int idx = mesh->iarr[i] + 1;
 260
 261                 if(fvcount == mesh->prim) {
 262                         fprintf(fp, "\nf");
 263                         fvcount = 0;
 264                 }
 265                 fprintf(fp, " %d/%d/%d", idx, idx, idx);
 266                 ++fvcount;
 267         }
 268         fprintf(fp, "\n");
 269
 270         fclose(fp);
 271         return 0;
 272 }
 273
 274 static char *clean_line(char *s)
 275 {
 276         char *end;
 277
 278         while(*s && isspace(*s)) ++s;
 279         if(!*s) return 0;
 280
 281         end = s;
 282         while(*end && *end != '#') ++end;
 283         *end = 0;
 284
 285         while(end > s && isspace(*end)) --end;
 286         *end = 0;
 287
 288         return s;
 289 }
 290
 291 static char *parse_idx(char *ptr, int *idx, int arrsz)
 292 {
 293         char *endp;
 294         int val = strtol(ptr, &endp, 10);
 295         if(endp == ptr) return 0;
 296
 297         if(val < 0) {   /* convert negative indices */
 298                 *idx = arrsz + val;
 299         } else {
 300                 *idx = val - 1; /* indices in obj are 1-based */
 301         }
 302         return endp;
 303 }
 304
 305 /* possible face-vertex definitions:
 306  * 1. vertex
 307  * 2. vertex/texcoord
 308  * 3. vertex//normal
 309  * 4. vertex/texcoord/normal
 310  */
 311 static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn)
 312 {
 313         if(!(ptr = parse_idx(ptr, &fv->vidx, numv)))
 314                 return 0;
 315         if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
 316
 317         if(*++ptr == '/') {     /* no texcoord */
 318                 fv->tidx = -1;
 319                 ++ptr;
 320         } else {
 321                 if(!(ptr = parse_idx(ptr, &fv->tidx, numt)))
 322                         return 0;
 323                 if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
 324                 ++ptr;
 325         }
 326
 327         if(!(ptr = parse_idx(ptr, &fv->nidx, numn)))
 328                 return 0;
 329         return (!*ptr || isspace(*ptr)) ? ptr : 0;
 330 }
 331
 332 static int cmp_facevert(const void *ap, const void *bp)
 333 {
 334         const struct facevertex *a = ap;
 335         const struct facevertex *b = bp;
 336
 337         if(a->vidx == b->vidx) {
 338                 if(a->tidx == b->tidx) {
 339                         return a->nidx - b->nidx;
 340                 }
 341                 return a->tidx - b->tidx;
 342         }
 343         return a->vidx - b->vidx;
 344 }
 345
 346 static void free_rbnode_key(struct rbnode *n, void *cls)
 347 {
 348         free(n->key);
 349 }
 350 #endif  /* 0 */