diff options
Diffstat (limited to 'scene.c')
| -rw-r--r-- | scene.c | 185 |
1 files changed, 185 insertions, 0 deletions
@@ -0,0 +1,185 @@ +#include <u.h> +#include <libc.h> +#include <thread.h> +#include <draw.h> +#include <memdraw.h> +#include <geometry.h> +#include "libobj/obj.h" +#include "graphics.h" +#include "internal.h" + +/* + * it only processes quads for now. + */ +static int +triangulate(OBJElem **newe, OBJElem *e) +{ + OBJIndexArray *newidxtab; + OBJIndexArray *idxtab; + + idxtab = &e->indextab[OBJVGeometric]; + newe[0] = emalloc(sizeof **newe); + newe[0]->type = OBJEFace; + newidxtab = &newe[0]->indextab[OBJVGeometric]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[1]; + newidxtab->indices[2] = idxtab->indices[2]; + idxtab = &e->indextab[OBJVTexture]; + if(idxtab->nindex > 0){ + newidxtab = &newe[0]->indextab[OBJVTexture]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[1]; + newidxtab->indices[2] = idxtab->indices[2]; + } + idxtab = &e->indextab[OBJVNormal]; + if(idxtab->nindex > 0){ + newidxtab = &newe[0]->indextab[OBJVNormal]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[1]; + newidxtab->indices[2] = idxtab->indices[2]; + } + + idxtab = &e->indextab[OBJVGeometric]; + newe[1] = emalloc(sizeof **newe); + newe[1]->type = OBJEFace; + newidxtab = &newe[1]->indextab[OBJVGeometric]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[2]; + newidxtab->indices[2] = idxtab->indices[3]; + idxtab = &e->indextab[OBJVTexture]; + if(idxtab->nindex > 0){ + newidxtab = &newe[1]->indextab[OBJVTexture]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[2]; + newidxtab->indices[2] = idxtab->indices[3]; + } + idxtab = &e->indextab[OBJVNormal]; + if(idxtab->nindex > 0){ + newidxtab = &newe[1]->indextab[OBJVNormal]; + newidxtab->nindex = 3; + newidxtab->indices = emalloc(newidxtab->nindex*sizeof(*newidxtab->indices)); + newidxtab->indices[0] = idxtab->indices[0]; + newidxtab->indices[1] = idxtab->indices[2]; + newidxtab->indices[2] = idxtab->indices[3]; + } + + return 2; +} + +/* + * rebuild the cache of renderable OBJElems. + * + * run it every time the Model's geometry changes. + */ +int +refreshmodel(Model *m) +{ + OBJElem *trielems[2]; + OBJObject *o; + OBJElem *e; + OBJIndexArray *idxtab; + int i; + + if(m->elems != nil){ + free(m->elems); + m->elems = nil; + } + m->nelems = 0; + for(i = 0; i < nelem(m->obj->objtab); i++) + for(o = m->obj->objtab[i]; o != nil; o = o->next) + for(e = o->child; e != nil; e = e->next){ + idxtab = &e->indextab[OBJVGeometric]; + /* discard non-triangles */ + if(e->type != OBJEFace || (idxtab->nindex != 3 && idxtab->nindex != 4)) + continue; + if(idxtab->nindex == 4){ + triangulate(trielems, e); + m->nelems += 2; + m->elems = erealloc(m->elems, m->nelems*sizeof(*m->elems)); + m->elems[m->nelems-2] = trielems[0]; + m->elems[m->nelems-1] = trielems[1]; + }else{ + m->elems = erealloc(m->elems, ++m->nelems*sizeof(*m->elems)); + m->elems[m->nelems-1] = e; + } + } + return m->nelems; +} + +Model * +newmodel(void) +{ + Model *m; + + m = emalloc(sizeof *m); + memset(m, 0, sizeof *m); + return m; +} + +void +delmodel(Model *m) +{ + free(m); +} + +Entity * +newentity(Model *m) +{ + Entity *e; + + e = emalloc(sizeof *e); + e->p = Pt3(0,0,0,1); + e->bx = Vec3(1,0,0); + e->by = Vec3(0,1,0); + e->bz = Vec3(0,0,1); + e->mdl = m; + e->prev = e->next = nil; + return e; +} + +void +delentity(Entity *e) +{ + /* TODO free model */ + free(e); +} + +static void +scene_addent(Scene *s, Entity *e) +{ + e->prev = s->ents.prev; + e->next = s->ents.prev->next; + s->ents.prev->next = e; + s->ents.prev = e; + s->nents++; +} + +Scene * +newscene(char *name) +{ + Scene *s; + + s = emalloc(sizeof *s); + s->name = name == nil? nil: strdup(name); + s->ents.prev = s->ents.next = &s->ents; + s->addent = scene_addent; + return s; +} + +void +delscene(Scene *s) +{ + /* TODO free ents */ + free(s->name); + free(s); +} |