10 int nelem; /* num elements per attribute [1, 4] */
11 float *data; /* dynarr */
13 int vbo_valid, data_valid;
19 unsigned int nverts, nfaces;
21 /* current value for each attribute for the immediate mode interface */
22 cgm_vec4 cur_val[CMESH_NUM_ATTR];
24 unsigned int buffer_objects[CMESH_NUM_ATTR + 1];
25 struct cmesh_vattrib vattr[CMESH_NUM_ATTR];
27 unsigned int *idata; /* dynarr */
29 int ibo_valid, idata_valid;
31 /* index buffer for wireframe rendering (constructed on demand) */
32 unsigned int wire_ibo;
35 /* axis-aligned bounding box */
36 cgm_vec3 aabb_min, aabb_max;
45 static int pre_draw(struct cmesh *cm);
46 static void post_draw(struct cmesh *cm, int cur_sdr);
47 static void update_buffers(struct cmesh *cm);
48 static void update_wire_ibo(struct cmesh *cm);
49 static void calc_aabb(struct cmesh *cm);
50 static void calc_bsph(struct cmesh *cm);
53 static int sdr_loc[CMESH_NUM_ATTR] = {0, 1, 2, 3, 4, 5, 6, 7};
54 static int use_custom_sdr_attr;
58 void cmesh_set_attrib_sdrloc(int attr, int loc)
63 int cmesh_get_attrib_sdrloc(int attr)
68 void cmesh_clear_attrib_sdrloc(void)
71 for(i=0; i<CMESH_NUM_ATTR; i++) {
77 struct cmesh *cmesh_alloc(void)
81 if(!(cm = malloc(sizeof *cm))) {
84 if(cmesh_init(cm) == -1) {
91 void cmesh_free(struct cmesh *cm)
97 int cmesh_init(struct cmesh *cm)
101 memset(cm, 0, sizeof *cm);
102 cgm_wcons(cm->cur_val + CMESH_ATTR_COLOR, 1, 1, 1, 1);
104 glGenBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
106 for(i=0; i<CMESH_NUM_ATTR; i++) {
107 if(!(cm->vattr[i].data = dynarr_alloc(0, sizeof(float)))) {
111 cm->vattr[i].vbo = cm->buffer_objects[i];
114 cm->ibo = cm->buffer_objects[CMESH_NUM_ATTR];
115 if(!(cm->idata = dynarr_alloc(0, sizeof *cm->idata))) {
122 void cmesh_destroy(struct cmesh *cm)
128 for(i=0; i<CMESH_NUM_ATTR; i++) {
129 dynarr_free(cm->vattr[i].data);
131 dynarr_free(cm->idata);
133 glDeleteBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
135 glDeleteBuffers(1, &cm->wire_ibo);
139 void cmesh_clear(struct cmesh *cm)
143 for(i=0; i<CMESH_NUM_ATTR; i++) {
144 cm->vattr[i].nelem = 0;
145 cm->vattr[i].vbo_valid = 0;
146 cm->vattr[i].data_valid = 0;
147 cm->vattr[i].data = dynarr_clear(cm->vattr[i].data);
149 cm->ibo_valid = cm->idata_valid = 0;
150 cm->idata = dynarr_clear(cm->idata);
152 cm->wire_ibo_valid = 0;
153 cm->nverts = cm->nfaces = 0;
155 cm->bsph_valid = cm->aabb_valid = 0;
158 int cmesh_clone(struct cmesh *cmdest, struct cmesh *cmsrc)
162 float *varr[CMESH_NUM_ATTR] = {0};
163 unsigned int *iarr = 0;
165 /* do anything that can fail first, before making any changes to cmdest
166 * so we have the option of recovering gracefuly
169 if(!(name = malloc(strlen(cmsrc->name)))) {
172 strcpy(name, cmsrc->name);
174 if(cmesh_indexed(cmsrc)) {
175 num = dynarr_size(cmsrc->idata);
176 if(!(iarr = dynarr_alloc(num, sizeof *iarr))) {
181 for(i=0; i<CMESH_NUM_ATTR; i++) {
182 if(cmesh_has_attrib(cmsrc, i)) {
183 nelem = cmsrc->vattr[i].nelem;
184 num = dynarr_size(cmsrc->vattr[i].data);
185 if(!(varr[i] = dynarr_alloc(num * nelem, sizeof(float)))) {
187 dynarr_free(varr[i]);
198 for(i=0; i<CMESH_NUM_ATTR; i++) {
199 dynarr_free(cmdest->vattr[i].data);
201 if(cmesh_has_attrib(cmsrc, i)) {
202 cmesh_attrib(cmsrc, i); /* force validation of the actual data on the source mesh */
204 nelem = cmsrc->vattr[i].nelem;
205 cmdest->vattr[i].nelem = nelem;
206 num = dynarr_size(cmsrc->vattr[i].data);
207 cmdest->vattr[i].data = varr[i];
208 memcpy(cmdest->vattr[i].data, cmsrc->vattr[i].data, num * nelem * sizeof(float));
209 cmdest->vattr[i].data_valid = 1;
210 cmdest->vattr[i].vbo_valid = 0;
212 memset(cmdest->vattr + i, 0, sizeof cmdest->vattr[i]);
216 dynarr_free(cmdest->idata);
217 if(cmesh_indexed(cmsrc)) {
218 cmesh_index(cmsrc); /* force validation .... */
220 num = dynarr_size(cmsrc->idata);
221 cmdest->idata = iarr;
222 memcpy(cmdest->idata, cmsrc->idata, num * sizeof *cmdest->idata);
223 cmdest->idata_valid = 1;
226 cmdest->idata_valid = cmdest->ibo_valid = 0;
232 cmdest->nverts = cmsrc->nverts;
233 cmdest->nfaces = cmsrc->nfaces;
235 memcpy(cmdest->cur_val, cmsrc->cur_val, sizeof cmdest->cur_val);
237 cmdest->aabb_min = cmsrc->aabb_min;
238 cmdest->aabb_max = cmsrc->aabb_max;
239 cmdest->aabb_valid = cmsrc->aabb_valid;
240 cmdest->bsph_center = cmsrc->bsph_center;
241 cmdest->bsph_radius = cmsrc->bsph_radius;
242 cmdest->bsph_valid = cmsrc->bsph_valid;
247 int cmesh_set_name(struct cmesh *cm, const char *name)
249 int len = strlen(name);
250 char *tmp = malloc(len + 1);
254 memcpy(cm->name, name, len + 1);
258 const char *cmesh_name(struct cmesh *cm)
263 int cmesh_has_attrib(struct cmesh *cm, int attr)
265 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
268 return cm->vattr[attr].vbo_valid | cm->vattr[attr].data_valid;
271 int cmesh_indexed(struct cmesh *cm)
273 return cm->ibo_valid | cm->idata_valid;
276 /* vdata can be 0, in which case only memory is allocated
277 * returns pointer to the attribute array
279 float *cmesh_set_attrib(struct cmesh *cm, int attr, int nelem, unsigned int num,
284 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
287 if(cm->nverts && num != cm->nverts) {
291 if(!(newarr = dynarr_alloc(num * nelem, sizeof *newarr))) {
295 memcpy(newarr, vdata, num * nelem * sizeof *newarr);
300 dynarr_free(cm->vattr[attr].data);
301 cm->vattr[attr].data = newarr;
302 cm->vattr[attr].nelem = nelem;
303 cm->vattr[attr].data_valid = 1;
304 cm->vattr[attr].vbo_valid = 0;
308 float *cmesh_attrib(struct cmesh *cm, int attr)
310 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
313 cm->vattr[attr].vbo_valid = 0;
314 return (float*)cmesh_attrib_ro(cm, attr);
317 const float *cmesh_attrib_ro(struct cmesh *cm, int attr)
322 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
326 if(!cm->vattr[attr].data_valid) {
327 #if GL_ES_VERSION_2_0
330 if(!cm->vattr[attr].vbo_valid) {
334 /* local data copy unavailable, grab the data from the vbo */
335 nelem = cm->vattr[attr].nelem;
336 if(!(tmp = dynarr_resize(cm->vattr[attr].data, cm->nverts * nelem))) {
339 cm->vattr[attr].data = tmp;
341 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[attr].vbo);
342 tmp = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
343 memcpy(cm->vattr[attr].data, tmp, cm->nverts * nelem * sizeof(float));
344 glUnmapBuffer(GL_ARRAY_BUFFER);
346 cm->vattr[attr].data_valid = 1;
349 return cm->vattr[attr].data;
352 float *cmesh_attrib_at(struct cmesh *cm, int attr, int idx)
354 float *vptr = cmesh_attrib(cm, attr);
355 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
358 const float *cmesh_attrib_at_ro(struct cmesh *cm, int attr, int idx)
360 const float *vptr = cmesh_attrib_ro(cm, attr);
361 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
364 int cmesh_attrib_count(struct cmesh *cm, int attr)
366 return cmesh_has_attrib(cm, attr) ? cm->nverts : 0;
369 /* indices can be 0, in which case only memory is allocated
370 * returns pointer to the index array
372 unsigned int *cmesh_set_index(struct cmesh *cm, int num, const unsigned int *indices)
375 int nidx = cm->nfaces * 3;
377 if(nidx && num != nidx) {
381 if(!(tmp = dynarr_alloc(num, sizeof *tmp))) {
385 memcpy(tmp, indices, num * sizeof *tmp);
388 dynarr_free(cm->idata);
395 unsigned int *cmesh_index(struct cmesh *cm)
398 return (unsigned int*)cmesh_index_ro(cm);
401 const unsigned int *cmesh_index_ro(struct cmesh *cm)
406 if(!cm->idata_valid) {
407 #if GL_ES_VERSION_2_0
414 /* local copy is unavailable, grab the data from the ibo */
415 nidx = cm->nfaces * 3;
416 if(!(tmp = dynarr_alloc(nidx, sizeof *cm->idata))) {
419 dynarr_free(cm->idata);
422 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
423 tmp = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_ONLY);
424 memcpy(cm->idata, tmp, nidx * sizeof *cm->idata);
425 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
433 int cmesh_index_count(struct cmesh *cm)
435 return cm->nfaces * 3;
438 int cmesh_poly_count(struct cmesh *cm)
444 return cm->nverts / 3;
449 /* attr can be -1 to invalidate all attributes */
450 void cmesh_invalidate_vbo(struct cmesh *cm, int attr)
454 if(attr >= CMESH_NUM_ATTR) {
459 for(i=0; i<CMESH_NUM_ATTR; i++) {
460 cm->vattr[i].vbo_valid = 0;
463 cm->vattr[attr].vbo_valid = 0;
467 void cmesh_invalidate_index(struct cmesh *cm)
472 int cmesh_append(struct cmesh *cmdest, struct cmesh *cmsrc)
474 int i, nelem, newsz, origsz, srcsz;
477 unsigned int idxoffs;
479 if(!cmdest->nverts) {
480 return cmesh_clone(cmdest, cmsrc);
483 for(i=0; i<CMESH_NUM_ATTR; i++) {
484 if(cmesh_has_attrib(cmdest, i) && cmesh_has_attrib(cmsrc, i)) {
485 /* force validation of the data arrays */
486 cmesh_attrib(cmdest, i);
487 cmesh_attrib_ro(cmsrc, i);
489 assert(cmdest->vattr[i].nelem == cmsrc->vattr[i].nelem);
490 nelem = cmdest->vattr[i].nelem;
491 origsz = cmdest->nverts * nelem;
492 newsz = cmdest->nverts + cmsrc->nverts * nelem;
494 if(!(vptr = dynarr_resize(cmdest->vattr[i].data, newsz))) {
497 memcpy(vptr + origsz, cmsrc->vattr[i].data, cmsrc->nverts * nelem * sizeof(float));
498 cmdest->vattr[i].data = vptr;
502 if(cmesh_indexed(cmdest)) {
503 assert(cmesh_indexed(cmsrc));
504 /* force validation ... */
506 cmesh_index_ro(cmsrc);
508 idxoffs = cmdest->nverts;
509 origsz = dynarr_size(cmdest->idata);
510 srcsz = dynarr_size(cmsrc->idata);
511 newsz = origsz + srcsz;
513 if(!(iptr = dynarr_resize(cmdest->idata, newsz))) {
516 cmdest->idata = iptr;
518 /* copy and fixup all the new indices */
520 for(i=0; i<srcsz; i++) {
521 *iptr++ = cmsrc->idata[i] + idxoffs;
525 cmdest->wire_ibo_valid = 0;
526 cmdest->aabb_valid = 0;
527 cmdest->bsph_valid = 0;
531 /* assemble a complete vertex by adding all the useful attributes */
532 int cmesh_vertex(struct cmesh *cm, float x, float y, float z)
536 cgm_wcons(cm->cur_val + CMESH_ATTR_VERTEX, x, y, z, 1.0f);
537 cm->vattr[CMESH_ATTR_VERTEX].data_valid = 1;
538 cm->vattr[CMESH_ATTR_VERTEX].nelem = 3;
540 for(i=0; i<CMESH_ATTR_VERTEX; i++) {
541 if(cm->vattr[i].data_valid) {
542 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
543 float *tmp = dynarr_push(cm->vattr[i].data, &cm->cur_val[i].x + j);
545 cm->vattr[i].data = tmp;
548 cm->vattr[i].vbo_valid = 0;
549 cm->vattr[i].data_valid = 1;
552 if(cm->idata_valid) {
553 cm->idata = dynarr_clear(cm->idata);
555 cm->ibo_valid = cm->idata_valid = 0;
559 void cmesh_normal(struct cmesh *cm, float nx, float ny, float nz)
561 cgm_wcons(cm->cur_val + CMESH_ATTR_NORMAL, nx, ny, nz, 1.0f);
562 cm->vattr[CMESH_ATTR_NORMAL].nelem = 3;
565 void cmesh_tangent(struct cmesh *cm, float tx, float ty, float tz)
567 cgm_wcons(cm->cur_val + CMESH_ATTR_TANGENT, tx, ty, tz, 1.0f);
568 cm->vattr[CMESH_ATTR_TANGENT].nelem = 3;
571 void cmesh_texcoord(struct cmesh *cm, float u, float v, float w)
573 cgm_wcons(cm->cur_val + CMESH_ATTR_TEXCOORD, u, v, w, 1.0f);
574 cm->vattr[CMESH_ATTR_TEXCOORD].nelem = 3;
577 void cmesh_boneweights(struct cmesh *cm, float w1, float w2, float w3, float w4)
579 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEWEIGHTS, w1, w2, w3, w4);
580 cm->vattr[CMESH_ATTR_BONEWEIGHTS].nelem = 4;
583 void cmesh_boneidx(struct cmesh *cm, int idx1, int idx2, int idx3, int idx4)
585 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEIDX, idx1, idx2, idx3, idx4);
586 cm->vattr[CMESH_ATTR_BONEIDX].nelem = 4;
589 static float *get_vec4(struct cmesh *cm, int attr, int idx, cgm_vec4 *res)
593 cgm_wcons(res, 0, 0, 0, 1);
594 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
599 for(i=0; i<cm->vattr[attr].nelem; i++) {
605 static float *get_vec3(struct cmesh *cm, int attr, int idx, cgm_vec3 *res)
609 cgm_vcons(res, 0, 0, 0);
610 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
615 for(i=0; i<cm->vattr[attr].nelem; i++) {
621 /* dir_xform can be null, in which case it's calculated from xform */
622 void cmesh_apply_xform(struct cmesh *cm, float *xform, float *dir_xform)
630 for(i=0; i<cm->nverts; i++) {
631 if(!(vptr = get_vec4(cm, CMESH_ATTR_VERTEX, i, &v))) {
634 cgm_wmul_m4v4(&v, xform);
635 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
639 if(cmesh_has_attrib(cm, CMESH_ATTR_NORMAL)) {
640 if((vptr = get_vec3(cm, CMESH_ATTR_NORMAL, i, &n))) {
641 cgm_vmul_m3v3(&n, dir_xform);
642 for(j=0; j<cm->vattr[CMESH_ATTR_NORMAL].nelem; j++) {
647 if(cmesh_has_attrib(cm, CMESH_ATTR_TANGENT)) {
648 if((vptr = get_vec3(cm, CMESH_ATTR_TANGENT, i, &t))) {
649 cgm_vmul_m3v3(&t, dir_xform);
650 for(j=0; j<cm->vattr[CMESH_ATTR_TANGENT].nelem; j++) {
658 void cmesh_flip(struct cmesh *cm)
660 cmesh_flip_faces(cm);
661 cmesh_flip_normals(cm);
664 void cmesh_flip_faces(struct cmesh *cm)
666 int i, j, idxnum, vnum, nelem;
667 unsigned int *indices;
670 if(cmesh_indexed(cm)) {
671 if(!(indices = cmesh_index(cm))) {
674 idxnum = cmesh_index_count(cm);
675 for(i=0; i<idxnum; i+=3) {
676 unsigned int tmp = indices[i + 2];
677 indices[i + 2] = indices[i + 1];
678 indices[i + 1] = tmp;
681 if(!(verts = cmesh_attrib(cm, CMESH_ATTR_VERTEX))) {
684 vnum = cmesh_attrib_count(cm, CMESH_ATTR_VERTEX);
685 nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
686 for(i=0; i<vnum; i+=3) {
687 for(j=0; j<nelem; j++) {
688 vptr = verts + (i + 1) * nelem + j;
689 float tmp = vptr[nelem];
690 vptr[nelem] = vptr[0];
696 void cmesh_flip_normals(struct cmesh *cm)
699 float *nptr = cmesh_attrib(cm, CMESH_ATTR_NORMAL);
702 num = cm->nverts * cm->vattr[CMESH_ATTR_NORMAL].nelem;
703 for(i=0; i<num; i++) {
709 int cmesh_explode(struct cmesh *cm)
711 int i, j, k, idxnum, nnverts;
712 unsigned int *indices;
714 if(!cmesh_indexed(cm)) return 0;
716 indices = cmesh_index(cm);
719 idxnum = cmesh_index_count(cm);
722 for(i=0; i<CMESH_NUM_ATTR; i++) {
724 float *tmpbuf, *dstptr;
726 if(!cmesh_has_attrib(cm, i)) continue;
728 srcbuf = cmesh_attrib(cm, i);
729 if(!(tmpbuf = dynarr_alloc(nnverts * cm->vattr[i].nelem, sizeof(float)))) {
734 for(j=0; j<idxnum; j++) {
735 unsigned int idx = indices[j];
736 const float *srcptr = srcbuf + idx * cm->vattr[i].nelem;
738 for(k=0; k<cm->vattr[i].nelem; k++) {
739 *dstptr++ = *srcptr++;
743 dynarr_free(cm->vattr[i].data);
744 cm->vattr[i].data = tmpbuf;
745 cm->vattr[i].data_valid = 1;
750 cm->idata = dynarr_clear(cm->idata);
752 cm->nverts = nnverts;
753 cm->nfaces = idxnum / 3;
757 void cmesh_calc_face_normals(struct cmesh *cm)
762 static int pre_draw(struct cmesh *cm)
766 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
770 if(!cm->vattr[CMESH_ATTR_VERTEX].vbo_valid) {
774 if(cur_sdr && use_custom_sdr_attr) {
775 if(sdr_loc[CMESH_ATTR_VERTEX] == -1) {
779 for(i=0; i<CMESH_NUM_ATTR; i++) {
781 if(loc >= 0 && cm->vattr[i].vbo_valid) {
782 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[i].vbo);
783 glVertexAttribPointer(loc, cm->vattr[i].nelem, GL_FLOAT, GL_FALSE, 0, 0);
784 glEnableVertexAttribArray(loc);
788 #ifndef GL_ES_VERSION_2_0
789 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_VERTEX].vbo);
790 glVertexPointer(cm->vattr[CMESH_ATTR_VERTEX].nelem, GL_FLOAT, 0, 0);
791 glEnableClientState(GL_VERTEX_ARRAY);
793 if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
794 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_NORMAL].vbo);
795 glNormalPointer(GL_FLOAT, 0, 0);
796 glEnableClientState(GL_NORMAL_ARRAY);
798 if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
799 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD].vbo);
800 glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD].nelem, GL_FLOAT, 0, 0);
801 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
803 if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
804 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_COLOR].vbo);
805 glColorPointer(cm->vattr[CMESH_ATTR_COLOR].nelem, GL_FLOAT, 0, 0);
806 glEnableClientState(GL_COLOR_ARRAY);
808 if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
809 glClientActiveTexture(GL_TEXTURE1);
810 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD2].vbo);
811 glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD2].nelem, GL_FLOAT, 0, 0);
812 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
813 glClientActiveTexture(GL_TEXTURE0);
815 #endif /* GL_ES_VERSION_2_0 */
817 glBindBuffer(GL_ARRAY_BUFFER, 0);
821 void cmesh_draw(struct cmesh *cm)
825 if((cur_sdr = pre_draw(cm)) == -1) {
830 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
831 glDrawElements(GL_TRIANGLES, cm->nfaces * 3, GL_UNSIGNED_INT, 0);
832 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
834 glDrawArrays(GL_TRIANGLES, 0, cm->nverts);
837 post_draw(cm, cur_sdr);
840 static void post_draw(struct cmesh *cm, int cur_sdr)
844 if(cur_sdr && use_custom_sdr_attr) {
845 for(i=0; i<CMESH_NUM_ATTR; i++) {
846 int loc = sdr_loc[i];
847 if(loc >= 0 && cm->vattr[i].vbo_valid) {
848 glDisableVertexAttribArray(loc);
852 #ifndef GL_ES_VERSION_2_0
853 glDisableClientState(GL_VERTEX_ARRAY);
854 if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
855 glDisableClientState(GL_NORMAL_ARRAY);
857 if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
858 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
860 if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
861 glDisableClientState(GL_COLOR_ARRAY);
863 if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
864 glClientActiveTexture(GL_TEXTURE1);
865 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
866 glClientActiveTexture(GL_TEXTURE0);
868 #endif /* GL_ES_VERSION_2_0 */
872 void cmesh_draw_wire(struct cmesh *cm, float linesz)
876 if((cur_sdr = pre_draw(cm)) == -1) {
881 nfaces = cmesh_poly_count(cm);
882 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->wire_ibo);
883 glDrawElements(GL_LINES, nfaces * 6, GL_UNSIGNED_INT, 0);
884 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
886 post_draw(cm, cur_sdr);
889 void cmesh_draw_vertices(struct cmesh *cm, float ptsz)
892 if((cur_sdr = pre_draw(cm)) == -1) {
896 glPushAttrib(GL_POINT_BIT);
898 glDrawArrays(GL_POINTS, 0, cm->nverts);
901 post_draw(cm, cur_sdr);
904 void cmesh_draw_normals(struct cmesh *cm, float len)
906 #ifndef GL_ES_VERSION_2_0
907 int i, cur_sdr, vert_nelem, norm_nelem;
909 const float *varr, *norm;
911 varr = cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX);
912 norm = cmesh_attrib_ro(cm, CMESH_ATTR_NORMAL);
913 if(!varr || !norm) return;
915 vert_nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
916 norm_nelem = cm->vattr[CMESH_ATTR_NORMAL].nelem;
918 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
919 if(cur_sdr && use_custom_sdr_attr) {
920 if((loc = sdr_loc[CMESH_ATTR_VERTEX]) < 0) {
926 for(i=0; i<cm->nverts; i++) {
927 float x, y, z, endx, endy, endz;
929 x = varr[i * vert_nelem];
930 y = varr[i * vert_nelem + 1];
931 z = varr[i * vert_nelem + 2];
932 endx = x + norm[i * norm_nelem] * len;
933 endy = y + norm[i * norm_nelem + 1] * len;
934 endz = z + norm[i * norm_nelem + 2] * len;
938 glVertex3f(endx, endy, endz);
940 glVertexAttrib3f(loc, x, y, z);
941 glVertexAttrib3f(loc, endx, endy, endz);
945 #endif /* GL_ES_VERSION_2_0 */
948 void cmesh_draw_tangents(struct cmesh *cm, float len)
950 #ifndef GL_ES_VERSION_2_0
951 int i, cur_sdr, vert_nelem, tang_nelem;
953 const float *varr, *tang;
955 varr = cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX);
956 tang = cmesh_attrib_ro(cm, CMESH_ATTR_TANGENT);
957 if(!varr || !tang) return;
959 vert_nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
960 tang_nelem = cm->vattr[CMESH_ATTR_TANGENT].nelem;
962 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
963 if(cur_sdr && use_custom_sdr_attr) {
964 if((loc = sdr_loc[CMESH_ATTR_VERTEX]) < 0) {
970 for(i=0; i<cm->nverts; i++) {
971 float x, y, z, endx, endy, endz;
973 x = varr[i * vert_nelem];
974 y = varr[i * vert_nelem + 1];
975 z = varr[i * vert_nelem + 2];
976 endx = x + tang[i * tang_nelem] * len;
977 endy = y + tang[i * tang_nelem + 1] * len;
978 endz = z + tang[i * tang_nelem + 2] * len;
982 glVertex3f(endx, endy, endz);
984 glVertexAttrib3f(loc, x, y, z);
985 glVertexAttrib3f(loc, endx, endy, endz);
989 #endif /* GL_ES_VERSION_2_0 */
992 static void update_buffers(struct cmesh *cm)
996 for(i=0; i<CMESH_NUM_ATTR; i++) {
997 if(cmesh_has_attrib(cm, i) && !cm->vattr[i].vbo_valid) {
998 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[i].vbo);
999 glBufferData(GL_ARRAY_BUFFER, cm->nverts * cm->vattr[i].nelem * sizeof(float),
1000 cm->vattr[i].data, GL_STATIC_DRAW);
1001 cm->vattr[i].vbo_valid = 1;
1004 glBindBuffer(GL_ARRAY_BUFFER, 0);
1006 if(cm->idata_valid && !cm->ibo_valid) {
1007 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
1008 glBufferData(GL_ELEMENT_ARRAY_BUFFER, cm->nfaces * 3 * sizeof(unsigned int),
1009 cm->idata, GL_STATIC_DRAW);
1011 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1015 static void update_wire_ibo(struct cmesh *cm)
1018 unsigned int *wire_idxarr, *dest;
1022 if(cm->wire_ibo_valid) return;
1025 glGenBuffers(1, &cm->wire_ibo);
1027 num_faces = cmesh_poly_count(cm);
1029 if(!(wire_idxarr = malloc(num_faces * 6 * sizeof *wire_idxarr))) {
1035 /* we're dealing with an indexed mesh */
1036 const unsigned int *idxarr = cmesh_index_ro(cm);
1038 for(i=0; i<num_faces; i++) {
1039 *dest++ = idxarr[0];
1040 *dest++ = idxarr[1];
1041 *dest++ = idxarr[1];
1042 *dest++ = idxarr[2];
1043 *dest++ = idxarr[2];
1044 *dest++ = idxarr[0];
1048 /* not an indexed mesh */
1049 for(i=0; i<num_faces; i++) {
1060 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->wire_ibo);
1061 glBufferData(GL_ELEMENT_ARRAY_BUFFER, num_faces * 6 * sizeof(unsigned int),
1062 wire_idxarr, GL_STATIC_DRAW);
1064 cm->wire_ibo_valid = 1;
1065 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1068 static void calc_aabb(struct cmesh *cm)
1072 if(!cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX)) {
1076 cgm_vcons(&cm->aabb_min, FLT_MAX, FLT_MAX, FLT_MAX);
1077 cgm_vcons(&cm->aabb_max, -FLT_MAX, -FLT_MAX, -FLT_MAX);
1079 for(i=0; i<cm->nverts; i++) {
1080 const float *v = cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1081 for(j=0; j<3; j++) {
1082 if(v[j] < (&cm->aabb_min.x)[j]) {
1083 (&cm->aabb_min.x)[j] = v[j];
1085 if(v[j] > (&cm->aabb_max.x)[j]) {
1086 (&cm->aabb_max.x)[j] = v[j];
1093 void cmesh_aabbox(struct cmesh *cm, cgm_vec3 *vmin, cgm_vec3 *vmax)
1095 if(!cm->aabb_valid) {
1098 *vmin = cm->aabb_min;
1099 *vmax = cm->aabb_max;
1102 static void calc_bsph(struct cmesh *cm)
1107 if(!cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX)) {
1111 cgm_vcons(&cm->bsph_center, 0, 0, 0);
1113 /* first find the center */
1114 for(i=0; i<cm->nverts; i++) {
1115 const float *v = cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1116 cm->bsph_center.x += v[0];
1117 cm->bsph_center.y += v[1];
1118 cm->bsph_center.z += v[2];
1120 s = 1.0f / (float)cm->nverts;
1121 cm->bsph_center.x *= s;
1122 cm->bsph_center.y *= s;
1123 cm->bsph_center.z *= s;
1125 cm->bsph_radius = 0.0f;
1126 for(i=0; i<cm->nverts; i++) {
1127 const cgm_vec3 *v = (const cgm_vec3*)cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1128 if((dist_sq = cgm_vdist_sq(v, &cm->bsph_center)) > cm->bsph_radius) {
1129 cm->bsph_radius = dist_sq;
1132 cm->bsph_radius = sqrt(cm->bsph_radius);
1136 float cmesh_bsphere(struct cmesh *cm, cgm_vec3 *center, float *rad)
1138 if(!cm->bsph_valid) {
1141 *center = cm->bsph_center;
1142 *rad = cm->bsph_radius;
1143 return cm->bsph_radius;
1147 void cmesh_texcoord_apply_xform(struct cmesh *cm, float *xform);
1148 void cmesh_texcoord_gen_plane(struct cmesh *cm, cgm_vec3 *norm, cgm_vec3 *tang);
1149 void cmesh_texcoord_gen_box(struct cmesh *cm);
1150 void cmesh_texcoord_gen_cylinder(struct cmesh *cm);
1152 int cmesh_dump(struct cmesh *cm, const char *fname);
1153 int cmesh_dump_file(struct cmesh *cm, FILE *fp);
1154 int cmesh_dump_obj(struct cmesh *cm, const char *fname);
1155 int cmesh_dump_obj_file(struct cmesh *cm, FILE *fp, int voffs);