9 int nelem; /* num elements per attribute [1, 4] */
10 float *data; /* dynarr */
12 int vbo_valid, data_valid;
18 unsigned int nverts, nfaces;
20 /* current value for each attribute for the immediate mode interface */
21 cgm_vec4 cur_val[CMESH_NUM_ATTR];
23 unsigned int buffer_objects[CMESH_NUM_ATTR + 1];
24 struct cmesh_vattrib vattr[CMESH_NUM_ATTR];
26 unsigned int *idata; /* dynarr */
28 int ibo_valid, idata_valid;
30 /* index buffer for wireframe rendering (constructed on demand) */
31 unsigned int wire_ibo;
34 /* axis-aligned bounding box */
35 cgm_vec3 aabb_min, aabb_max;
43 static int sdr_loc[CMESH_NUM_ATTR] = {0, 1, 2, 3, 4, 5, 6, 7};
47 void cmesh_set_attrib_sdrloc(int attr, int loc)
52 int cmesh_get_attrib_sdrloc(int attr)
57 void cmesh_clear_attrib_sdrloc(void)
60 for(i=0; i<CMESH_NUM_ATTR; i++) {
66 struct cmesh *cmesh_alloc(void)
70 if(!(cm = malloc(sizeof *cm))) {
73 if(cmesh_init(cm) == -1) {
80 void cmesh_free(struct cmesh *cm)
86 int cmesh_init(struct cmesh *cm)
90 memset(cm, 0, sizeof *cm);
91 cgm_wcons(cm->cur_val + CMESH_ATTR_COLOR, 1, 1, 1, 1);
93 glGenBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
95 for(i=0; i<CMESH_NUM_ATTR; i++) {
96 if(!(cm->vattr[i].data = dynarr_alloc(0, sizeof(float)))) {
100 cm->vattr[i].vbo = cm->buffer_objects[i];
103 cm->ibo = cm->buffer_objects[CMESH_NUM_ATTR];
104 if(!(cm->idata = dynarr_alloc(0, sizeof *cm->idata))) {
111 void cmesh_destroy(struct cmesh *cm)
117 for(i=0; i<CMESH_NUM_ATTR; i++) {
118 dynarr_free(cm->vattr[i].data);
120 dynarr_free(cm->idata);
122 glDeleteBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
124 glDeleteBuffers(1, &cm->wire_ibo);
128 void cmesh_clear(struct cmesh *cm)
132 for(i=0; i<CMESH_NUM_ATTR; i++) {
133 cm->vattr[i].nelem = 0;
134 cm->vattr[i].vbo_valid = 0;
135 cm->vattr[i].data_valid = 0;
136 cm->vattr[i].data = dynarr_clear(cm->vattr[i].data);
138 cm->ibo_valid = cm->idata_valid = 0;
139 cm->idata = dynarr_clear(cm->idata);
141 cm->wire_ibo_valid = 0;
142 cm->nverts = cm->nfaces = 0;
144 cm->bsph_valid = cm->aabb_valid = 0;
147 int cmesh_clone(struct cmesh *cmdest, struct cmesh *cmsrc)
151 float *varr[CMESH_NUM_ATTR] = {0};
152 unsigned int *iarr = 0;
154 /* do anything that can fail first, before making any changes to cmdest
155 * so we have the option of recovering gracefuly
158 if(!(name = malloc(strlen(cmsrc->name)))) {
161 strcpy(name, cmsrc->name);
163 if(cmesh_indexed(cmsrc)) {
164 num = dynarr_size(cmsrc->idata);
165 if(!(iarr = dynarr_alloc(num, sizeof *iarr))) {
170 for(i=0; i<CMESH_NUM_ATTR; i++) {
171 if(cmesh_has_attrib(cmsrc, i)) {
172 nelem = cmsrc->vattr[i].nelem;
173 num = dynarr_size(cmsrc->vattr[i].data);
174 if(!(varr[i] = dynarr_alloc(num * nelem, sizeof(float)))) {
176 dynarr_free(varr[i]);
187 for(i=0; i<CMESH_NUM_ATTR; i++) {
188 dynarr_free(cmdest->vattr[i].data);
190 if(cmesh_has_attrib(cmsrc, i)) {
191 cmesh_attrib(cmsrc, i); /* force validation of the actual data on the source mesh */
193 nelem = cmsrc->vattr[i].nelem;
194 cmdest->vattr[i].nelem = nelem;
195 num = dynarr_size(cmsrc->vattr[i].data);
196 cmdest->vattr[i].data = varr[i];
197 memcpy(cmdest->vattr[i].data, cmsrc->vattr[i].data, num * nelem * sizeof(float));
198 cmdest->vattr[i].data_valid = 1;
199 cmdest->vattr[i].vbo_valid = 0;
201 memset(cmdest->vattr + i, 0, sizeof cmdest->vattr[i]);
205 dynarr_free(cmdest->idata);
206 if(cmesh_indexed(cmsrc)) {
207 cmesh_index(cmsrc); /* force validation .... */
209 num = dynarr_size(cmsrc->idata);
210 cmdest->idata = iarr;
211 memcpy(cmdest->idata, cmsrc->idata, num * sizeof *cmdest->idata);
212 cmdest->idata_valid = 1;
215 cmdest->idata_valid = cmdest->ibo_valid = 0;
221 cmdest->nverts = cmsrc->nverts;
222 cmdest->nfaces = cmsrc->nfaces;
224 memcpy(cmdest->cur_val, cmsrc->cur_val, sizeof cmdest->cur_val);
226 cmdest->aabb_min = cmsrc->aabb_min;
227 cmdest->aabb_max = cmsrc->aabb_max;
228 cmdest->aabb_valid = cmsrc->aabb_valid;
229 cmdest->bsph_center = cmsrc->bsph_center;
230 cmdest->bsph_radius = cmsrc->bsph_radius;
231 cmdest->bsph_valid = cmsrc->bsph_valid;
236 int cmesh_set_name(struct cmesh *cm, const char *name)
238 int len = strlen(name);
239 char *tmp = malloc(len + 1);
243 memcpy(cm->name, name, len + 1);
247 const char *cmesh_name(struct cmesh *cm)
252 int cmesh_has_attrib(struct cmesh *cm, int attr)
254 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
257 return cm->vattr[attr].vbo_valid | cm->vattr[attr].data_valid;
260 int cmesh_indexed(struct cmesh *cm)
262 return cm->ibo_valid | cm->idata_valid;
265 /* vdata can be 0, in which case only memory is allocated
266 * returns pointer to the attribute array
268 float *cmesh_set_attrib(struct cmesh *cm, int attr, int nelem, unsigned int num,
273 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
276 if(cm->nverts && num != cm->nverts) {
280 if(!(newarr = dynarr_alloc(num * nelem, sizeof *newarr))) {
284 memcpy(newarr, vdata, num * nelem * sizeof *newarr);
289 dynarr_free(cm->vattr[attr].data);
290 cm->vattr[attr].data = newarr;
291 cm->vattr[attr].nelem = nelem;
292 cm->vattr[attr].data_valid = 1;
293 cm->vattr[attr].vbo_valid = 0;
297 float *cmesh_attrib(struct cmesh *cm, int attr)
299 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
302 cm->vattr[attr].vbo_valid = 0;
303 return (float*)cmesh_attrib_ro(cm, attr);
306 const float *cmesh_attrib_ro(struct cmesh *cm, int attr)
311 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
315 if(!cm->vattr[attr].data_valid) {
316 #if GL_ES_VERSION_2_0
319 if(!cm->vattr[attr].vbo_valid) {
323 /* local data copy unavailable, grab the data from the vbo */
324 nelem = cm->vattr[attr].nelem;
325 if(!(tmp = dynarr_resize(cm->vattr[attr].data, cm->nverts * nelem))) {
328 cm->vattr[attr].data = tmp;
330 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[attr].vbo);
331 tmp = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
332 memcpy(cm->vattr[attr].data, tmp, cm->nverts * nelem * sizeof(float));
333 glUnmapBuffer(GL_ARRAY_BUFFER);
335 cm->vattr[attr].data_valid = 1;
338 return cm->vattr[attr].data;
341 float *cmesh_attrib_at(struct cmesh *cm, int attr, int idx)
343 float *vptr = cmesh_attrib(cm, attr);
344 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
347 const float *cmesh_attrib_at_ro(struct cmesh *cm, int attr, int idx)
349 const float *vptr = cmesh_attrib_ro(cm, attr);
350 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
353 int cmesh_attrib_count(struct cmesh *cm, int attr)
355 return cmesh_has_attrib(cm, attr) ? cm->nverts : 0;
358 /* indices can be 0, in which case only memory is allocated
359 * returns pointer to the index array
361 unsigned int *cmesh_set_index(struct cmesh *cm, int num, const unsigned int *indices)
364 int nidx = cm->nfaces * 3;
366 if(nidx && num != nidx) {
370 if(!(tmp = dynarr_alloc(num, sizeof *tmp))) {
374 memcpy(tmp, indices, num * sizeof *tmp);
377 dynarr_free(cm->idata);
384 unsigned int *cmesh_index(struct cmesh *cm)
387 return (unsigned int*)cmesh_index_ro(cm);
390 const unsigned int *cmesh_index_ro(struct cmesh *cm)
395 if(!cm->idata_valid) {
396 #if GL_ES_VERSION_2_0
403 /* local copy is unavailable, grab the data from the ibo */
404 nidx = cm->nfaces * 3;
405 if(!(tmp = dynarr_alloc(nidx, sizeof *cm->idata))) {
408 dynarr_free(cm->idata);
411 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
412 tmp = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_ONLY);
413 memcpy(cm->idata, tmp, nidx * sizeof *cm->idata);
414 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
422 int cmesh_index_count(struct cmesh *cm)
424 return cm->nfaces * 3;
427 int get_poly_count(struct cmesh *cm)
433 return cm->nverts / 3;
438 /* attr can be -1 to invalidate all attributes */
439 void cmesh_invalidate_vbo(struct cmesh *cm, int attr)
443 if(attr >= CMESH_NUM_ATTR) {
448 for(i=0; i<CMESH_NUM_ATTR; i++) {
449 cm->vattr[i].vbo_valid = 0;
452 cm->vattr[attr].vbo_valid = 0;
456 void cmesh_invalidate_index(struct cmesh *cm)
461 int cmesh_append(struct cmesh *cmdest, struct cmesh *cmsrc)
463 int i, nelem, newsz, origsz, srcsz;
466 unsigned int idxoffs;
468 if(!cmdest->nverts) {
469 return cmesh_clone(cmdest, cmsrc);
472 for(i=0; i<CMESH_NUM_ATTR; i++) {
473 if(cmesh_has_attrib(cmdest, i) && cmesh_has_attrib(cmsrc, i)) {
474 /* force validation of the data arrays */
475 cmesh_attrib(cmdest, i);
476 cmesh_attrib_ro(cmsrc, i);
478 assert(cmdest->vattr[i].nelem == cmsrc->vattr[i].nelem);
479 nelem = cmdest->vattr[i].nelem;
480 origsz = cmdest->nverts * nelem;
481 newsz = cmdest->nverts + cmsrc->nverts * nelem;
483 if(!(vptr = dynarr_resize(cmdest->vattr[i].data, newsz))) {
486 memcpy(vptr + origsz, cmsrc->vattr[i].data, cmsrc->nverts * nelem * sizeof(float));
487 cmdest->vattr[i].data = vptr;
491 if(cmesh_indexed(cmdest)) {
492 assert(cmesh_indexed(cmsrc));
493 /* force validation ... */
495 cmesh_index_ro(cmsrc);
497 idxoffs = cmdest->nverts;
498 origsz = dynarr_size(cmdest->idata);
499 srcsz = dynarr_size(cmsrc->idata);
500 newsz = origsz + srcsz;
502 if(!(iptr = dynarr_resize(cmdest->idata, newsz))) {
505 cmdest->idata = iptr;
507 /* copy and fixup all the new indices */
509 for(i=0; i<srcsz; i++) {
510 *iptr++ = cmsrc->idata[i] + idxoffs;
514 cmdest->wire_ibo_valid = 0;
515 cmdest->aabb_valid = 0;
516 cmdest->bsph_valid = 0;
520 /* assemble a complete vertex by adding all the useful attributes */
521 int cmesh_vertex(struct cmesh *cm, float x, float y, float z)
525 cgm_wcons(cm->cur_val + CMESH_ATTR_VERTEX, x, y, z, 1.0f);
526 cm->vattr[CMESH_ATTR_VERTEX].data_valid = 1;
527 cm->vattr[CMESH_ATTR_VERTEX].nelem = 3;
529 for(i=0; i<CMESH_ATTR_VERTEX; i++) {
530 if(cm->vattr[i].data_valid) {
531 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
532 float *tmp = dynarr_push(cm->vattr[i].data, &cm->cur_val[i].x + j);
534 cm->vattr[i].data = tmp;
537 cm->vattr[i].vbo_valid = 0;
538 cm->vattr[i].data_valid = 1;
541 if(cm->idata_valid) {
542 cm->idata = dynarr_clear(cm->idata);
544 cm->ibo_valid = cm->idata_valid = 0;
548 void cmesh_normal(struct cmesh *cm, float nx, float ny, float nz)
550 cgm_wcons(cm->cur_val + CMESH_ATTR_NORMAL, nx, ny, nz, 1.0f);
551 cm->vattr[CMESH_ATTR_NORMAL].nelem = 3;
554 void cmesh_tangent(struct cmesh *cm, float tx, float ty, float tz)
556 cgm_wcons(cm->cur_val + CMESH_ATTR_TANGENT, tx, ty, tz, 1.0f);
557 cm->vattr[CMESH_ATTR_TANGENT].nelem = 3;
560 void cmesh_texcoord(struct cmesh *cm, float u, float v, float w)
562 cgm_wcons(cm->cur_val + CMESH_ATTR_TEXCOORD, u, v, w, 1.0f);
563 cm->vattr[CMESH_ATTR_TEXCOORD].nelem = 3;
566 void cmesh_boneweights(struct cmesh *cm, float w1, float w2, float w3, float w4)
568 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEWEIGHTS, w1, w2, w3, w4);
569 cm->vattr[CMESH_ATTR_BONEWEIGHTS].nelem = 4;
572 void cmesh_boneidx(struct cmesh *cm, int idx1, int idx2, int idx3, int idx4)
574 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEIDX, idx1, idx2, idx3, idx4);
575 cm->vattr[CMESH_ATTR_BONEIDX].nelem = 4;
578 static float *get_vec4(struct cmesh *cm, int attr, int idx, cgm_vec4 *res)
582 cgm_wcons(res, 0, 0, 0, 1);
583 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
588 for(i=0; i<cm->vattr[attr].nelem; i++) {
594 static float *get_vec3(struct cmesh *cm, int attr, int idx, cgm_vec3 *res)
598 cgm_vcons(res, 0, 0, 0);
599 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
604 for(i=0; i<cm->vattr[attr].nelem; i++) {
610 /* dir_xform can be null, in which case it's calculated from xform */
611 void cmesh_apply_xform(struct cmesh *cm, float *xform, float *dir_xform)
619 for(i=0; i<cm->nverts; i++) {
620 if(!(vptr = get_vec4(cm, CMESH_ATTR_VERTEX, i, &v))) {
623 cgm_wmul_m4v4(&v, xform);
624 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
628 if(cmesh_has_attrib(cm, CMESH_ATTR_NORMAL)) {
629 if((vptr = get_vec3(cm, CMESH_ATTR_NORMAL, i, &n))) {
630 cgm_vmul_m3v3(&n, dir_xform);
631 for(j=0; j<cm->vattr[CMESH_ATTR_NORMAL].nelem; j++) {
636 if(cmesh_has_attrib(cm, CMESH_ATTR_TANGENT)) {
637 if((vptr = get_vec3(cm, CMESH_ATTR_TANGENT, i, &t))) {
638 cgm_vmul_m3v3(&t, dir_xform);
639 for(j=0; j<cm->vattr[CMESH_ATTR_TANGENT].nelem; j++) {
647 void cmesh_flip(struct cmesh *cm)
649 cmesh_flip_faces(cm);
650 cmesh_flip_normals(cm);
653 void cmesh_flip_faces(struct cmesh *cm)
656 void cmesh_flip_normals(struct cmesh *cm)
660 void cmesh_explode(struct cmesh *cm); /* undo all vertex sharing */
662 /* this is only guaranteed to work on an exploded mesh */
663 void cmesh_calc_face_normals(struct cmesh *cm);
665 void cmesh_draw(struct cmesh *cm);
666 void cmesh_draw_wire(struct cmesh *cm, float linesz);
667 void cmesh_draw_vertices(struct cmesh *cm, float ptsz);
668 void cmesh_draw_normals(struct cmesh *cm, float len);
669 void cmesh_draw_tangents(struct cmesh *cm, float len);
671 /* get the bounding box in local space. The result will be cached and subsequent
672 * calls will return the same box. The cache gets invalidated by any functions that
673 * can affect the vertex data
675 void cmesh_aabbox(struct cmesh *cm, cgm_vec3 *vmin, cgm_vec3 *vmax);
677 /* get the bounding sphere in local space. The result will be cached ... see above */
678 float cmesh_bsphere(struct cmesh *cm, cgm_vec3 *center, float *rad);
680 /* texture coordinate manipulation */
681 void cmesh_texcoord_apply_xform(struct cmesh *cm, float *xform);
682 void cmesh_texcoord_gen_plane(struct cmesh *cm, cgm_vec3 *norm, cgm_vec3 *tang);
683 void cmesh_texcoord_gen_box(struct cmesh *cm);
684 void cmesh_texcoord_gen_cylinder(struct cmesh *cm);
686 int cmesh_dump(struct cmesh *cm, const char *fname);
687 int cmesh_dump_file(struct cmesh *cm, FILE *fp);
688 int cmesh_dump_obj(struct cmesh *cm, const char *fname);
689 int cmesh_dump_obj_file(struct cmesh *cm, FILE *fp, int voffs);