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);
52 static int def_nelem[CMESH_NUM_ATTR] = {3, 3, 3, 2, 4, 4, 4, 2};
54 static int sdr_loc[CMESH_NUM_ATTR] = {0, 1, 2, 3, 4, 5, 6, 7};
55 static int use_custom_sdr_attr;
59 void cmesh_set_attrib_sdrloc(int attr, int loc)
64 int cmesh_get_attrib_sdrloc(int attr)
69 void cmesh_clear_attrib_sdrloc(void)
72 for(i=0; i<CMESH_NUM_ATTR; i++) {
78 struct cmesh *cmesh_alloc(void)
82 if(!(cm = malloc(sizeof *cm))) {
85 if(cmesh_init(cm) == -1) {
92 void cmesh_free(struct cmesh *cm)
98 int cmesh_init(struct cmesh *cm)
102 memset(cm, 0, sizeof *cm);
103 cgm_wcons(cm->cur_val + CMESH_ATTR_COLOR, 1, 1, 1, 1);
105 glGenBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
107 for(i=0; i<CMESH_NUM_ATTR; i++) {
108 if(!(cm->vattr[i].data = dynarr_alloc(0, sizeof(float)))) {
112 cm->vattr[i].vbo = cm->buffer_objects[i];
115 cm->ibo = cm->buffer_objects[CMESH_NUM_ATTR];
116 if(!(cm->idata = dynarr_alloc(0, sizeof *cm->idata))) {
123 void cmesh_destroy(struct cmesh *cm)
129 for(i=0; i<CMESH_NUM_ATTR; i++) {
130 dynarr_free(cm->vattr[i].data);
132 dynarr_free(cm->idata);
134 glDeleteBuffers(CMESH_NUM_ATTR + 1, cm->buffer_objects);
136 glDeleteBuffers(1, &cm->wire_ibo);
140 void cmesh_clear(struct cmesh *cm)
144 for(i=0; i<CMESH_NUM_ATTR; i++) {
145 cm->vattr[i].nelem = 0;
146 cm->vattr[i].vbo_valid = 0;
147 cm->vattr[i].data_valid = 0;
148 cm->vattr[i].data = dynarr_clear(cm->vattr[i].data);
150 cm->ibo_valid = cm->idata_valid = 0;
151 cm->idata = dynarr_clear(cm->idata);
153 cm->wire_ibo_valid = 0;
154 cm->nverts = cm->nfaces = 0;
156 cm->bsph_valid = cm->aabb_valid = 0;
159 int cmesh_clone(struct cmesh *cmdest, struct cmesh *cmsrc)
163 float *varr[CMESH_NUM_ATTR] = {0};
164 unsigned int *iarr = 0;
166 /* do anything that can fail first, before making any changes to cmdest
167 * so we have the option of recovering gracefuly
170 if(!(name = malloc(strlen(cmsrc->name)))) {
173 strcpy(name, cmsrc->name);
175 if(cmesh_indexed(cmsrc)) {
176 num = dynarr_size(cmsrc->idata);
177 if(!(iarr = dynarr_alloc(num, sizeof *iarr))) {
182 for(i=0; i<CMESH_NUM_ATTR; i++) {
183 if(cmesh_has_attrib(cmsrc, i)) {
184 nelem = cmsrc->vattr[i].nelem;
185 num = dynarr_size(cmsrc->vattr[i].data);
186 if(!(varr[i] = dynarr_alloc(num * nelem, sizeof(float)))) {
188 dynarr_free(varr[i]);
199 for(i=0; i<CMESH_NUM_ATTR; i++) {
200 dynarr_free(cmdest->vattr[i].data);
202 if(cmesh_has_attrib(cmsrc, i)) {
203 cmesh_attrib(cmsrc, i); /* force validation of the actual data on the source mesh */
205 nelem = cmsrc->vattr[i].nelem;
206 cmdest->vattr[i].nelem = nelem;
207 num = dynarr_size(cmsrc->vattr[i].data);
208 cmdest->vattr[i].data = varr[i];
209 memcpy(cmdest->vattr[i].data, cmsrc->vattr[i].data, num * nelem * sizeof(float));
210 cmdest->vattr[i].data_valid = 1;
211 cmdest->vattr[i].vbo_valid = 0;
213 memset(cmdest->vattr + i, 0, sizeof cmdest->vattr[i]);
217 dynarr_free(cmdest->idata);
218 if(cmesh_indexed(cmsrc)) {
219 cmesh_index(cmsrc); /* force validation .... */
221 num = dynarr_size(cmsrc->idata);
222 cmdest->idata = iarr;
223 memcpy(cmdest->idata, cmsrc->idata, num * sizeof *cmdest->idata);
224 cmdest->idata_valid = 1;
227 cmdest->idata_valid = cmdest->ibo_valid = 0;
233 cmdest->nverts = cmsrc->nverts;
234 cmdest->nfaces = cmsrc->nfaces;
236 memcpy(cmdest->cur_val, cmsrc->cur_val, sizeof cmdest->cur_val);
238 cmdest->aabb_min = cmsrc->aabb_min;
239 cmdest->aabb_max = cmsrc->aabb_max;
240 cmdest->aabb_valid = cmsrc->aabb_valid;
241 cmdest->bsph_center = cmsrc->bsph_center;
242 cmdest->bsph_radius = cmsrc->bsph_radius;
243 cmdest->bsph_valid = cmsrc->bsph_valid;
248 int cmesh_set_name(struct cmesh *cm, const char *name)
250 int len = strlen(name);
251 char *tmp = malloc(len + 1);
255 memcpy(cm->name, name, len + 1);
259 const char *cmesh_name(struct cmesh *cm)
264 int cmesh_has_attrib(struct cmesh *cm, int attr)
266 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
269 return cm->vattr[attr].vbo_valid | cm->vattr[attr].data_valid;
272 int cmesh_indexed(struct cmesh *cm)
274 return cm->ibo_valid | cm->idata_valid;
277 /* vdata can be 0, in which case only memory is allocated
278 * returns pointer to the attribute array
280 float *cmesh_set_attrib(struct cmesh *cm, int attr, int nelem, unsigned int num,
285 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
288 if(cm->nverts && num != cm->nverts) {
292 if(!(newarr = dynarr_alloc(num * nelem, sizeof *newarr))) {
296 memcpy(newarr, vdata, num * nelem * sizeof *newarr);
301 dynarr_free(cm->vattr[attr].data);
302 cm->vattr[attr].data = newarr;
303 cm->vattr[attr].nelem = nelem;
304 cm->vattr[attr].data_valid = 1;
305 cm->vattr[attr].vbo_valid = 0;
309 float *cmesh_attrib(struct cmesh *cm, int attr)
311 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
314 cm->vattr[attr].vbo_valid = 0;
315 return (float*)cmesh_attrib_ro(cm, attr);
318 const float *cmesh_attrib_ro(struct cmesh *cm, int attr)
323 if(attr < 0 || attr >= CMESH_NUM_ATTR) {
327 if(!cm->vattr[attr].data_valid) {
328 #if GL_ES_VERSION_2_0
331 if(!cm->vattr[attr].vbo_valid) {
335 /* local data copy unavailable, grab the data from the vbo */
336 nelem = cm->vattr[attr].nelem;
337 if(!(tmp = dynarr_resize(cm->vattr[attr].data, cm->nverts * nelem))) {
340 cm->vattr[attr].data = tmp;
342 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[attr].vbo);
343 tmp = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
344 memcpy(cm->vattr[attr].data, tmp, cm->nverts * nelem * sizeof(float));
345 glUnmapBuffer(GL_ARRAY_BUFFER);
347 cm->vattr[attr].data_valid = 1;
350 return cm->vattr[attr].data;
353 float *cmesh_attrib_at(struct cmesh *cm, int attr, int idx)
355 float *vptr = cmesh_attrib(cm, attr);
356 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
359 const float *cmesh_attrib_at_ro(struct cmesh *cm, int attr, int idx)
361 const float *vptr = cmesh_attrib_ro(cm, attr);
362 return vptr ? vptr + idx * cm->vattr[attr].nelem : 0;
365 int cmesh_attrib_count(struct cmesh *cm, int attr)
367 return cmesh_has_attrib(cm, attr) ? cm->nverts : 0;
370 int cmesh_push_attrib(struct cmesh *cm, int attr, float *v)
374 int cursz = dynarr_size(cm->vattr[attr].data);
375 int newsz = cursz + cm->vattr[attr].nelem;
377 if(!(vptr = dynarr_resize(cm->vattr[attr].data, newsz))) {
380 cm->vattr[attr].data = vptr;
383 if(!cm->vattr[attr].nelem) {
384 cm->vattr[attr].nelem = def_nelem[attr];
387 for(i=0; i<cm->vattr[attr].nelem; i++) {
390 cm->vattr[attr].data_valid = 1;
391 cm->vattr[attr].vbo_valid = 0;
395 int cmesh_push_attrib1f(struct cmesh *cm, int attr, float x)
401 return cmesh_push_attrib(cm, attr, v);
404 int cmesh_push_attrib2f(struct cmesh *cm, int attr, float x, float y)
411 return cmesh_push_attrib(cm, attr, v);
414 int cmesh_push_attrib3f(struct cmesh *cm, int attr, float x, float y, float z)
421 return cmesh_push_attrib(cm, attr, v);
424 int cmesh_push_attrib4f(struct cmesh *cm, int attr, float x, float y, float z, float w)
431 return cmesh_push_attrib(cm, attr, v);
434 /* indices can be 0, in which case only memory is allocated
435 * returns pointer to the index array
437 unsigned int *cmesh_set_index(struct cmesh *cm, int num, const unsigned int *indices)
440 int nidx = cm->nfaces * 3;
442 if(nidx && num != nidx) {
446 if(!(tmp = dynarr_alloc(num, sizeof *tmp))) {
450 memcpy(tmp, indices, num * sizeof *tmp);
453 dynarr_free(cm->idata);
460 unsigned int *cmesh_index(struct cmesh *cm)
463 return (unsigned int*)cmesh_index_ro(cm);
466 const unsigned int *cmesh_index_ro(struct cmesh *cm)
471 if(!cm->idata_valid) {
472 #if GL_ES_VERSION_2_0
479 /* local copy is unavailable, grab the data from the ibo */
480 nidx = cm->nfaces * 3;
481 if(!(tmp = dynarr_alloc(nidx, sizeof *cm->idata))) {
484 dynarr_free(cm->idata);
487 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
488 tmp = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_ONLY);
489 memcpy(cm->idata, tmp, nidx * sizeof *cm->idata);
490 glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
498 int cmesh_index_count(struct cmesh *cm)
500 return cm->nfaces * 3;
503 int cmesh_push_index(struct cmesh *cm, unsigned int idx)
506 if(!(iptr = dynarr_push(cm->idata, &idx))) {
515 int cmesh_poly_count(struct cmesh *cm)
521 return cm->nverts / 3;
526 /* attr can be -1 to invalidate all attributes */
527 void cmesh_invalidate_vbo(struct cmesh *cm, int attr)
531 if(attr >= CMESH_NUM_ATTR) {
536 for(i=0; i<CMESH_NUM_ATTR; i++) {
537 cm->vattr[i].vbo_valid = 0;
540 cm->vattr[attr].vbo_valid = 0;
544 void cmesh_invalidate_index(struct cmesh *cm)
549 int cmesh_append(struct cmesh *cmdest, struct cmesh *cmsrc)
551 int i, nelem, newsz, origsz, srcsz;
554 unsigned int idxoffs;
556 if(!cmdest->nverts) {
557 return cmesh_clone(cmdest, cmsrc);
560 for(i=0; i<CMESH_NUM_ATTR; i++) {
561 if(cmesh_has_attrib(cmdest, i) && cmesh_has_attrib(cmsrc, i)) {
562 /* force validation of the data arrays */
563 cmesh_attrib(cmdest, i);
564 cmesh_attrib_ro(cmsrc, i);
566 assert(cmdest->vattr[i].nelem == cmsrc->vattr[i].nelem);
567 nelem = cmdest->vattr[i].nelem;
568 origsz = cmdest->nverts * nelem;
569 newsz = cmdest->nverts + cmsrc->nverts * nelem;
571 if(!(vptr = dynarr_resize(cmdest->vattr[i].data, newsz))) {
574 memcpy(vptr + origsz, cmsrc->vattr[i].data, cmsrc->nverts * nelem * sizeof(float));
575 cmdest->vattr[i].data = vptr;
579 if(cmesh_indexed(cmdest)) {
580 assert(cmesh_indexed(cmsrc));
581 /* force validation ... */
583 cmesh_index_ro(cmsrc);
585 idxoffs = cmdest->nverts;
586 origsz = dynarr_size(cmdest->idata);
587 srcsz = dynarr_size(cmsrc->idata);
588 newsz = origsz + srcsz;
590 if(!(iptr = dynarr_resize(cmdest->idata, newsz))) {
593 cmdest->idata = iptr;
595 /* copy and fixup all the new indices */
597 for(i=0; i<srcsz; i++) {
598 *iptr++ = cmsrc->idata[i] + idxoffs;
602 cmdest->wire_ibo_valid = 0;
603 cmdest->aabb_valid = 0;
604 cmdest->bsph_valid = 0;
608 /* assemble a complete vertex by adding all the useful attributes */
609 int cmesh_vertex(struct cmesh *cm, float x, float y, float z)
613 cgm_wcons(cm->cur_val + CMESH_ATTR_VERTEX, x, y, z, 1.0f);
614 cm->vattr[CMESH_ATTR_VERTEX].data_valid = 1;
615 cm->vattr[CMESH_ATTR_VERTEX].nelem = 3;
617 for(i=0; i<CMESH_ATTR_VERTEX; i++) {
618 if(cm->vattr[i].data_valid) {
619 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
620 float *tmp = dynarr_push(cm->vattr[i].data, &cm->cur_val[i].x + j);
622 cm->vattr[i].data = tmp;
625 cm->vattr[i].vbo_valid = 0;
626 cm->vattr[i].data_valid = 1;
629 if(cm->idata_valid) {
630 cm->idata = dynarr_clear(cm->idata);
632 cm->ibo_valid = cm->idata_valid = 0;
636 void cmesh_normal(struct cmesh *cm, float nx, float ny, float nz)
638 cgm_wcons(cm->cur_val + CMESH_ATTR_NORMAL, nx, ny, nz, 1.0f);
639 cm->vattr[CMESH_ATTR_NORMAL].nelem = 3;
642 void cmesh_tangent(struct cmesh *cm, float tx, float ty, float tz)
644 cgm_wcons(cm->cur_val + CMESH_ATTR_TANGENT, tx, ty, tz, 1.0f);
645 cm->vattr[CMESH_ATTR_TANGENT].nelem = 3;
648 void cmesh_texcoord(struct cmesh *cm, float u, float v, float w)
650 cgm_wcons(cm->cur_val + CMESH_ATTR_TEXCOORD, u, v, w, 1.0f);
651 cm->vattr[CMESH_ATTR_TEXCOORD].nelem = 3;
654 void cmesh_boneweights(struct cmesh *cm, float w1, float w2, float w3, float w4)
656 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEWEIGHTS, w1, w2, w3, w4);
657 cm->vattr[CMESH_ATTR_BONEWEIGHTS].nelem = 4;
660 void cmesh_boneidx(struct cmesh *cm, int idx1, int idx2, int idx3, int idx4)
662 cgm_wcons(cm->cur_val + CMESH_ATTR_BONEIDX, idx1, idx2, idx3, idx4);
663 cm->vattr[CMESH_ATTR_BONEIDX].nelem = 4;
666 static float *get_vec4(struct cmesh *cm, int attr, int idx, cgm_vec4 *res)
670 cgm_wcons(res, 0, 0, 0, 1);
671 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
676 for(i=0; i<cm->vattr[attr].nelem; i++) {
682 static float *get_vec3(struct cmesh *cm, int attr, int idx, cgm_vec3 *res)
686 cgm_vcons(res, 0, 0, 0);
687 if(!(sptr = cmesh_attrib_at(cm, attr, idx))) {
692 for(i=0; i<cm->vattr[attr].nelem; i++) {
698 /* dir_xform can be null, in which case it's calculated from xform */
699 void cmesh_apply_xform(struct cmesh *cm, float *xform, float *dir_xform)
707 for(i=0; i<cm->nverts; i++) {
708 if(!(vptr = get_vec4(cm, CMESH_ATTR_VERTEX, i, &v))) {
711 cgm_wmul_m4v4(&v, xform);
712 for(j=0; j<cm->vattr[CMESH_ATTR_VERTEX].nelem; j++) {
716 if(cmesh_has_attrib(cm, CMESH_ATTR_NORMAL)) {
717 if((vptr = get_vec3(cm, CMESH_ATTR_NORMAL, i, &n))) {
718 cgm_vmul_m3v3(&n, dir_xform);
719 for(j=0; j<cm->vattr[CMESH_ATTR_NORMAL].nelem; j++) {
724 if(cmesh_has_attrib(cm, CMESH_ATTR_TANGENT)) {
725 if((vptr = get_vec3(cm, CMESH_ATTR_TANGENT, i, &t))) {
726 cgm_vmul_m3v3(&t, dir_xform);
727 for(j=0; j<cm->vattr[CMESH_ATTR_TANGENT].nelem; j++) {
735 void cmesh_flip(struct cmesh *cm)
737 cmesh_flip_faces(cm);
738 cmesh_flip_normals(cm);
741 void cmesh_flip_faces(struct cmesh *cm)
743 int i, j, idxnum, vnum, nelem;
744 unsigned int *indices;
747 if(cmesh_indexed(cm)) {
748 if(!(indices = cmesh_index(cm))) {
751 idxnum = cmesh_index_count(cm);
752 for(i=0; i<idxnum; i+=3) {
753 unsigned int tmp = indices[i + 2];
754 indices[i + 2] = indices[i + 1];
755 indices[i + 1] = tmp;
758 if(!(verts = cmesh_attrib(cm, CMESH_ATTR_VERTEX))) {
761 vnum = cmesh_attrib_count(cm, CMESH_ATTR_VERTEX);
762 nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
763 for(i=0; i<vnum; i+=3) {
764 for(j=0; j<nelem; j++) {
765 vptr = verts + (i + 1) * nelem + j;
766 float tmp = vptr[nelem];
767 vptr[nelem] = vptr[0];
773 void cmesh_flip_normals(struct cmesh *cm)
776 float *nptr = cmesh_attrib(cm, CMESH_ATTR_NORMAL);
779 num = cm->nverts * cm->vattr[CMESH_ATTR_NORMAL].nelem;
780 for(i=0; i<num; i++) {
786 int cmesh_explode(struct cmesh *cm)
788 int i, j, k, idxnum, nnverts;
789 unsigned int *indices;
791 if(!cmesh_indexed(cm)) return 0;
793 indices = cmesh_index(cm);
796 idxnum = cmesh_index_count(cm);
799 for(i=0; i<CMESH_NUM_ATTR; i++) {
801 float *tmpbuf, *dstptr;
803 if(!cmesh_has_attrib(cm, i)) continue;
805 srcbuf = cmesh_attrib(cm, i);
806 if(!(tmpbuf = dynarr_alloc(nnverts * cm->vattr[i].nelem, sizeof(float)))) {
811 for(j=0; j<idxnum; j++) {
812 unsigned int idx = indices[j];
813 const float *srcptr = srcbuf + idx * cm->vattr[i].nelem;
815 for(k=0; k<cm->vattr[i].nelem; k++) {
816 *dstptr++ = *srcptr++;
820 dynarr_free(cm->vattr[i].data);
821 cm->vattr[i].data = tmpbuf;
822 cm->vattr[i].data_valid = 1;
827 cm->idata = dynarr_clear(cm->idata);
829 cm->nverts = nnverts;
830 cm->nfaces = idxnum / 3;
834 void cmesh_calc_face_normals(struct cmesh *cm)
839 static int pre_draw(struct cmesh *cm)
843 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
847 if(!cm->vattr[CMESH_ATTR_VERTEX].vbo_valid) {
851 if(cur_sdr && use_custom_sdr_attr) {
852 if(sdr_loc[CMESH_ATTR_VERTEX] == -1) {
856 for(i=0; i<CMESH_NUM_ATTR; i++) {
858 if(loc >= 0 && cm->vattr[i].vbo_valid) {
859 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[i].vbo);
860 glVertexAttribPointer(loc, cm->vattr[i].nelem, GL_FLOAT, GL_FALSE, 0, 0);
861 glEnableVertexAttribArray(loc);
865 #ifndef GL_ES_VERSION_2_0
866 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_VERTEX].vbo);
867 glVertexPointer(cm->vattr[CMESH_ATTR_VERTEX].nelem, GL_FLOAT, 0, 0);
868 glEnableClientState(GL_VERTEX_ARRAY);
870 if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
871 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_NORMAL].vbo);
872 glNormalPointer(GL_FLOAT, 0, 0);
873 glEnableClientState(GL_NORMAL_ARRAY);
875 if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
876 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD].vbo);
877 glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD].nelem, GL_FLOAT, 0, 0);
878 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
880 if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
881 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_COLOR].vbo);
882 glColorPointer(cm->vattr[CMESH_ATTR_COLOR].nelem, GL_FLOAT, 0, 0);
883 glEnableClientState(GL_COLOR_ARRAY);
885 if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
886 glClientActiveTexture(GL_TEXTURE1);
887 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[CMESH_ATTR_TEXCOORD2].vbo);
888 glTexCoordPointer(cm->vattr[CMESH_ATTR_TEXCOORD2].nelem, GL_FLOAT, 0, 0);
889 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
890 glClientActiveTexture(GL_TEXTURE0);
892 #endif /* GL_ES_VERSION_2_0 */
894 glBindBuffer(GL_ARRAY_BUFFER, 0);
898 void cmesh_draw(struct cmesh *cm)
902 if((cur_sdr = pre_draw(cm)) == -1) {
907 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
908 glDrawElements(GL_TRIANGLES, cm->nfaces * 3, GL_UNSIGNED_INT, 0);
909 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
911 glDrawArrays(GL_TRIANGLES, 0, cm->nverts);
914 post_draw(cm, cur_sdr);
917 static void post_draw(struct cmesh *cm, int cur_sdr)
921 if(cur_sdr && use_custom_sdr_attr) {
922 for(i=0; i<CMESH_NUM_ATTR; i++) {
923 int loc = sdr_loc[i];
924 if(loc >= 0 && cm->vattr[i].vbo_valid) {
925 glDisableVertexAttribArray(loc);
929 #ifndef GL_ES_VERSION_2_0
930 glDisableClientState(GL_VERTEX_ARRAY);
931 if(cm->vattr[CMESH_ATTR_NORMAL].vbo_valid) {
932 glDisableClientState(GL_NORMAL_ARRAY);
934 if(cm->vattr[CMESH_ATTR_TEXCOORD].vbo_valid) {
935 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
937 if(cm->vattr[CMESH_ATTR_COLOR].vbo_valid) {
938 glDisableClientState(GL_COLOR_ARRAY);
940 if(cm->vattr[CMESH_ATTR_TEXCOORD2].vbo_valid) {
941 glClientActiveTexture(GL_TEXTURE1);
942 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
943 glClientActiveTexture(GL_TEXTURE0);
945 #endif /* GL_ES_VERSION_2_0 */
949 void cmesh_draw_wire(struct cmesh *cm, float linesz)
953 if((cur_sdr = pre_draw(cm)) == -1) {
958 nfaces = cmesh_poly_count(cm);
959 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->wire_ibo);
960 glDrawElements(GL_LINES, nfaces * 6, GL_UNSIGNED_INT, 0);
961 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
963 post_draw(cm, cur_sdr);
966 void cmesh_draw_vertices(struct cmesh *cm, float ptsz)
969 if((cur_sdr = pre_draw(cm)) == -1) {
973 glPushAttrib(GL_POINT_BIT);
975 glDrawArrays(GL_POINTS, 0, cm->nverts);
978 post_draw(cm, cur_sdr);
981 void cmesh_draw_normals(struct cmesh *cm, float len)
983 #ifndef GL_ES_VERSION_2_0
984 int i, cur_sdr, vert_nelem, norm_nelem;
986 const float *varr, *norm;
988 varr = cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX);
989 norm = cmesh_attrib_ro(cm, CMESH_ATTR_NORMAL);
990 if(!varr || !norm) return;
992 vert_nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
993 norm_nelem = cm->vattr[CMESH_ATTR_NORMAL].nelem;
995 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
996 if(cur_sdr && use_custom_sdr_attr) {
997 if((loc = sdr_loc[CMESH_ATTR_VERTEX]) < 0) {
1003 for(i=0; i<cm->nverts; i++) {
1004 float x, y, z, endx, endy, endz;
1006 x = varr[i * vert_nelem];
1007 y = varr[i * vert_nelem + 1];
1008 z = varr[i * vert_nelem + 2];
1009 endx = x + norm[i * norm_nelem] * len;
1010 endy = y + norm[i * norm_nelem + 1] * len;
1011 endz = z + norm[i * norm_nelem + 2] * len;
1014 glVertex3f(x, y, z);
1015 glVertex3f(endx, endy, endz);
1017 glVertexAttrib3f(loc, x, y, z);
1018 glVertexAttrib3f(loc, endx, endy, endz);
1022 #endif /* GL_ES_VERSION_2_0 */
1025 void cmesh_draw_tangents(struct cmesh *cm, float len)
1027 #ifndef GL_ES_VERSION_2_0
1028 int i, cur_sdr, vert_nelem, tang_nelem;
1030 const float *varr, *tang;
1032 varr = cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX);
1033 tang = cmesh_attrib_ro(cm, CMESH_ATTR_TANGENT);
1034 if(!varr || !tang) return;
1036 vert_nelem = cm->vattr[CMESH_ATTR_VERTEX].nelem;
1037 tang_nelem = cm->vattr[CMESH_ATTR_TANGENT].nelem;
1039 glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
1040 if(cur_sdr && use_custom_sdr_attr) {
1041 if((loc = sdr_loc[CMESH_ATTR_VERTEX]) < 0) {
1047 for(i=0; i<cm->nverts; i++) {
1048 float x, y, z, endx, endy, endz;
1050 x = varr[i * vert_nelem];
1051 y = varr[i * vert_nelem + 1];
1052 z = varr[i * vert_nelem + 2];
1053 endx = x + tang[i * tang_nelem] * len;
1054 endy = y + tang[i * tang_nelem + 1] * len;
1055 endz = z + tang[i * tang_nelem + 2] * len;
1058 glVertex3f(x, y, z);
1059 glVertex3f(endx, endy, endz);
1061 glVertexAttrib3f(loc, x, y, z);
1062 glVertexAttrib3f(loc, endx, endy, endz);
1066 #endif /* GL_ES_VERSION_2_0 */
1069 static void update_buffers(struct cmesh *cm)
1073 for(i=0; i<CMESH_NUM_ATTR; i++) {
1074 if(cmesh_has_attrib(cm, i) && !cm->vattr[i].vbo_valid) {
1075 glBindBuffer(GL_ARRAY_BUFFER, cm->vattr[i].vbo);
1076 glBufferData(GL_ARRAY_BUFFER, cm->nverts * cm->vattr[i].nelem * sizeof(float),
1077 cm->vattr[i].data, GL_STATIC_DRAW);
1078 cm->vattr[i].vbo_valid = 1;
1081 glBindBuffer(GL_ARRAY_BUFFER, 0);
1083 if(cm->idata_valid && !cm->ibo_valid) {
1084 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->ibo);
1085 glBufferData(GL_ELEMENT_ARRAY_BUFFER, cm->nfaces * 3 * sizeof(unsigned int),
1086 cm->idata, GL_STATIC_DRAW);
1088 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1092 static void update_wire_ibo(struct cmesh *cm)
1095 unsigned int *wire_idxarr, *dest;
1099 if(cm->wire_ibo_valid) return;
1102 glGenBuffers(1, &cm->wire_ibo);
1104 num_faces = cmesh_poly_count(cm);
1106 if(!(wire_idxarr = malloc(num_faces * 6 * sizeof *wire_idxarr))) {
1112 /* we're dealing with an indexed mesh */
1113 const unsigned int *idxarr = cmesh_index_ro(cm);
1115 for(i=0; i<num_faces; i++) {
1116 *dest++ = idxarr[0];
1117 *dest++ = idxarr[1];
1118 *dest++ = idxarr[1];
1119 *dest++ = idxarr[2];
1120 *dest++ = idxarr[2];
1121 *dest++ = idxarr[0];
1125 /* not an indexed mesh */
1126 for(i=0; i<num_faces; i++) {
1137 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cm->wire_ibo);
1138 glBufferData(GL_ELEMENT_ARRAY_BUFFER, num_faces * 6 * sizeof(unsigned int),
1139 wire_idxarr, GL_STATIC_DRAW);
1141 cm->wire_ibo_valid = 1;
1142 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
1145 static void calc_aabb(struct cmesh *cm)
1149 if(!cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX)) {
1153 cgm_vcons(&cm->aabb_min, FLT_MAX, FLT_MAX, FLT_MAX);
1154 cgm_vcons(&cm->aabb_max, -FLT_MAX, -FLT_MAX, -FLT_MAX);
1156 for(i=0; i<cm->nverts; i++) {
1157 const float *v = cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1158 for(j=0; j<3; j++) {
1159 if(v[j] < (&cm->aabb_min.x)[j]) {
1160 (&cm->aabb_min.x)[j] = v[j];
1162 if(v[j] > (&cm->aabb_max.x)[j]) {
1163 (&cm->aabb_max.x)[j] = v[j];
1170 void cmesh_aabbox(struct cmesh *cm, cgm_vec3 *vmin, cgm_vec3 *vmax)
1172 if(!cm->aabb_valid) {
1175 *vmin = cm->aabb_min;
1176 *vmax = cm->aabb_max;
1179 static void calc_bsph(struct cmesh *cm)
1184 if(!cmesh_attrib_ro(cm, CMESH_ATTR_VERTEX)) {
1188 cgm_vcons(&cm->bsph_center, 0, 0, 0);
1190 /* first find the center */
1191 for(i=0; i<cm->nverts; i++) {
1192 const float *v = cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1193 cm->bsph_center.x += v[0];
1194 cm->bsph_center.y += v[1];
1195 cm->bsph_center.z += v[2];
1197 s = 1.0f / (float)cm->nverts;
1198 cm->bsph_center.x *= s;
1199 cm->bsph_center.y *= s;
1200 cm->bsph_center.z *= s;
1202 cm->bsph_radius = 0.0f;
1203 for(i=0; i<cm->nverts; i++) {
1204 const cgm_vec3 *v = (const cgm_vec3*)cmesh_attrib_at_ro(cm, CMESH_ATTR_VERTEX, i);
1205 if((dist_sq = cgm_vdist_sq(v, &cm->bsph_center)) > cm->bsph_radius) {
1206 cm->bsph_radius = dist_sq;
1209 cm->bsph_radius = sqrt(cm->bsph_radius);
1213 float cmesh_bsphere(struct cmesh *cm, cgm_vec3 *center, float *rad)
1215 if(!cm->bsph_valid) {
1218 *center = cm->bsph_center;
1219 *rad = cm->bsph_radius;
1220 return cm->bsph_radius;
1224 void cmesh_texcoord_apply_xform(struct cmesh *cm, float *xform);
1225 void cmesh_texcoord_gen_plane(struct cmesh *cm, cgm_vec3 *norm, cgm_vec3 *tang);
1226 void cmesh_texcoord_gen_box(struct cmesh *cm);
1227 void cmesh_texcoord_gen_cylinder(struct cmesh *cm);
1229 int cmesh_dump(struct cmesh *cm, const char *fname);
1230 int cmesh_dump_file(struct cmesh *cm, FILE *fp);
1231 int cmesh_dump_obj(struct cmesh *cm, const char *fname);
1232 int cmesh_dump_obj_file(struct cmesh *cm, FILE *fp, int voffs);