+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <assert.h>
-#include "mesh.h"
-#include "dynarr.h"
-#include "rbtree.h"
-#include "vmath.h"
-#include "3dgfx.h"
-#include "util.h"
-
-struct vertex_pos_color {
- float x, y, z;
- float r, g, b, a;
-};
-
-struct facevertex {
- int vidx, tidx, nidx;
-};
-
-static char *clean_line(char *s);
-static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn);
-static int cmp_facevert(const void *ap, const void *bp);
-static void free_rbnode_key(struct rbnode *n, void *cls);
-
-/* merge of different indices per attribute happens during face processing.
- *
- * A triplet of (vertex index/texcoord index/normal index) is used as the key
- * to search in a balanced binary search tree for vertex buffer index assigned
- * to the same triplet if it has been encountered before. That index is
- * appended to the index buffer.
- *
- * If a particular triplet has not been encountered before, a new g3d_vertex is
- * appended to the vertex buffer. The index of this new vertex is appended to
- * the index buffer, and also inserted into the tree for future searches.
- */
-int load_mesh(struct g3d_mesh *mesh, const char *fname)
-{
- int i, line_num = 0, result = -1;
- int found_quad = 0;
- FILE *fp = 0;
- char buf[256];
- struct vertex_pos_color *varr = 0;
- vec3_t *narr = 0;
- vec2_t *tarr = 0;
- struct rbtree *rbtree = 0;
-
- if(!(fp = fopen(fname, "rb"))) {
- fprintf(stderr, "load_mesh: failed to open file: %s\n", fname);
- goto err;
- }
-
- if(!(rbtree = rb_create(cmp_facevert))) {
- fprintf(stderr, "load_mesh: failed to create facevertex binary search tree\n");
- goto err;
- }
- rb_set_delete_func(rbtree, free_rbnode_key, 0);
-
- if(!(mesh->varr = dynarr_alloc(0, sizeof *mesh->varr)) ||
- !(mesh->iarr = dynarr_alloc(0, sizeof *mesh->iarr))) {
- fprintf(stderr, "load_mesh: failed to allocate resizable mesh arrays\n");
- goto err;
- }
- if(!(varr = dynarr_alloc(0, sizeof *varr)) ||
- !(narr = dynarr_alloc(0, sizeof *narr)) ||
- !(tarr = dynarr_alloc(0, sizeof *tarr))) {
- fprintf(stderr, "load_mesh: failed to allocate resizable vertex array\n");
- goto err;
- }
-
- while(fgets(buf, sizeof buf, fp)) {
- char *line = clean_line(buf);
- ++line_num;
-
- if(!*line) continue;
-
- switch(line[0]) {
- case 'v':
- if(isspace(line[1])) {
- /* vertex */
- struct vertex_pos_color v;
- int num;
-
- 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);
- if(num < 3) {
- fprintf(stderr, "%s:%d: invalid vertex definition: \"%s\"\n", fname, line_num, line);
- goto err;
- }
- switch(num) {
- case 3:
- v.r = 1.0f;
- case 4:
- v.g = 1.0f;
- case 5:
- v.b = 1.0f;
- case 6:
- v.a = 1.0f;
- }
- if(!(varr = dynarr_push(varr, &v))) {
- fprintf(stderr, "load_mesh: failed to resize vertex buffer\n");
- goto err;
- }
-
- } else if(line[1] == 't' && isspace(line[2])) {
- /* texcoord */
- vec2_t tc;
- if(sscanf(line + 3, "%f %f", &tc.x, &tc.y) != 2) {
- fprintf(stderr, "%s:%d: invalid texcoord definition: \"%s\"\n", fname, line_num, line);
- goto err;
- }
- if(!(tarr = dynarr_push(tarr, &tc))) {
- fprintf(stderr, "load_mesh: failed to resize texcoord buffer\n");
- goto err;
- }
-
- } else if(line[1] == 'n' && isspace(line[2])) {
- /* normal */
- vec3_t norm;
- if(sscanf(line + 3, "%f %f %f", &norm.x, &norm.y, &norm.z) != 3) {
- fprintf(stderr, "%s:%d: invalid normal definition: \"%s\"\n", fname, line_num, line);
- goto err;
- }
- if(!(narr = dynarr_push(narr, &norm))) {
- fprintf(stderr, "load_mesh: failed to resize normal buffer\n");
- goto err;
- }
- }
- break;
-
- case 'f':
- if(isspace(line[1])) {
- /* face */
- char *ptr = line + 2;
- struct facevertex fv;
- struct rbnode *node;
- int vsz = dynarr_size(varr);
- int tsz = dynarr_size(tarr);
- int nsz = dynarr_size(narr);
-
- for(i=0; i<4; i++) {
- if(!(ptr = parse_face_vert(ptr, &fv, vsz, tsz, nsz))) {
- if(i < 3 || found_quad) {
- fprintf(stderr, "%s:%d: invalid face definition: \"%s\"\n", fname, line_num, line);
- goto err;
- } else {
- break;
- }
- }
-
- if((node = rb_find(rbtree, &fv))) {
- uint16_t idx = (int)(intptr_t)node->data;
- if(!(mesh->iarr = dynarr_push(mesh->iarr, &idx))) {
- fprintf(stderr, "load_mesh: failed to resize index array\n");
- goto err;
- }
- } else {
- uint16_t newidx = dynarr_size(mesh->varr);
- struct g3d_vertex v;
- struct facevertex *newfv;
-
- v.x = varr[fv.vidx].x;
- v.y = varr[fv.vidx].y;
- v.z = varr[fv.vidx].z;
- v.w = 1.0f;
- v.r = cround64(varr[fv.vidx].r * 255.0);
- v.g = cround64(varr[fv.vidx].g * 255.0);
- v.b = cround64(varr[fv.vidx].b * 255.0);
- v.a = cround64(varr[fv.vidx].a * 255.0);
- if(fv.tidx >= 0) {
- v.u = tarr[fv.tidx].x;
- v.v = tarr[fv.tidx].y;
- } else {
- v.u = v.x;
- v.v = v.y;
- }
- if(fv.nidx >= 0) {
- v.nx = narr[fv.nidx].x;
- v.ny = narr[fv.nidx].y;
- v.nz = narr[fv.nidx].z;
- } else {
- v.nx = v.ny = 0.0f;
- v.nz = 1.0f;
- }
-
- if(!(mesh->varr = dynarr_push(mesh->varr, &v))) {
- fprintf(stderr, "load_mesh: failed to resize combined vertex array\n");
- goto err;
- }
- if(!(mesh->iarr = dynarr_push(mesh->iarr, &newidx))) {
- fprintf(stderr, "load_mesh: failed to resize index array\n");
- goto err;
- }
-
- if((newfv = malloc(sizeof *newfv))) {
- *newfv = fv;
- }
- if(!newfv || rb_insert(rbtree, newfv, (void*)(intptr_t)newidx) == -1) {
- fprintf(stderr, "load_mesh: failed to insert facevertex to the binary search tree\n");
- goto err;
- }
- }
- }
- if(i > 3) found_quad = 1;
- }
- break;
-
- default:
- break;
- }
- }
-
- mesh->prim = found_quad ? G3D_QUADS : G3D_TRIANGLES;
- mesh->vcount = dynarr_size(mesh->varr);
- mesh->icount = dynarr_size(mesh->iarr);
- mesh->varr = dynarr_finalize(mesh->varr);
- mesh->iarr = dynarr_finalize(mesh->iarr);
- result = 0; /* success */
-
- printf("loaded %s mesh: %s: %d vertices, %d faces\n", found_quad ? "quad" : "triangle",
- fname, mesh->vcount, mesh->icount / mesh->prim);
-
-err:
- if(fp) fclose(fp);
- dynarr_free(varr);
- dynarr_free(narr);
- dynarr_free(tarr);
- if(result == -1) {
- dynarr_free(mesh->varr);
- dynarr_free(mesh->iarr);
- }
- rb_free(rbtree);
- return result;
-}
-
-int save_mesh(struct g3d_mesh *mesh, const char *fname)
-{
- int i, fvcount;
- FILE *fp;
-
- if(!(fp = fopen(fname, "wb"))) {
- fprintf(stderr, "save_mesh: failed to open %s for writing\n", fname);
- return -1;
- }
- fprintf(fp, "# Wavefront OBJ file shoved in your FACE by Mindlapse. Deal with it\n");
-
- for(i=0; i<mesh->vcount; i++) {
- struct g3d_vertex *v = mesh->varr + i;
- 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,
- v->b / 255.0f, v->a / 255.0f);
- }
- for(i=0; i<mesh->vcount; i++) {
- fprintf(fp, "vn %f %f %f\n", mesh->varr[i].nx, mesh->varr[i].ny, mesh->varr[i].nz);
- }
- for(i=0; i<mesh->vcount; i++) {
- fprintf(fp, "vt %f %f\n", mesh->varr[i].u, mesh->varr[i].v);
- }
-
- fvcount = mesh->prim;
- for(i=0; i<mesh->icount; i++) {
- int idx = mesh->iarr[i] + 1;
-
- if(fvcount == mesh->prim) {
- fprintf(fp, "\nf");
- fvcount = 0;
- }
- fprintf(fp, " %d/%d/%d", idx, idx, idx);
- ++fvcount;
- }
- fprintf(fp, "\n");
-
- fclose(fp);
- return 0;
-}
-
-static char *clean_line(char *s)
-{
- char *end;
-
- while(*s && isspace(*s)) ++s;
- if(!*s) return 0;
-
- end = s;
- while(*end && *end != '#') ++end;
- *end = 0;
-
- while(end > s && isspace(*end)) --end;
- *end = 0;
-
- return s;
-}
-
-static char *parse_idx(char *ptr, int *idx, int arrsz)
-{
- char *endp;
- int val = strtol(ptr, &endp, 10);
- if(endp == ptr) return 0;
-
- if(val < 0) { /* convert negative indices */
- *idx = arrsz + val;
- } else {
- *idx = val - 1; /* indices in obj are 1-based */
- }
- return endp;
-}
-
-/* possible face-vertex definitions:
- * 1. vertex
- * 2. vertex/texcoord
- * 3. vertex//normal
- * 4. vertex/texcoord/normal
- */
-static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn)
-{
- if(!(ptr = parse_idx(ptr, &fv->vidx, numv)))
- return 0;
- if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
-
- if(*++ptr == '/') { /* no texcoord */
- fv->tidx = -1;
- ++ptr;
- } else {
- if(!(ptr = parse_idx(ptr, &fv->tidx, numt)))
- return 0;
- if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
- ++ptr;
- }
-
- if(!(ptr = parse_idx(ptr, &fv->nidx, numn)))
- return 0;
- return (!*ptr || isspace(*ptr)) ? ptr : 0;
-}
-
-static int cmp_facevert(const void *ap, const void *bp)
-{
- const struct facevertex *a = ap;
- const struct facevertex *b = bp;
-
- if(a->vidx == b->vidx) {
- if(a->tidx == b->tidx) {
- return a->nidx - b->nidx;
- }
- return a->tidx - b->tidx;
- }
- return a->vidx - b->vidx;
-}
-
-static void free_rbnode_key(struct rbnode *n, void *cls)
-{
- free(n->key);
-}
projects / dosdemo / blobdiff