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i32 add_entity(entity_t entity, elist_t *list)
{
assert(list);
i32 i;
for (i = 0; i < MAX_ENTITIES; ++i)
if (!list->nodes[i].id)
break;
if (i == MAX_ENTITIES) {
printf("error: failed to add entity\n");
return 0;
}
++list->count;
enode_t *node = list->nodes+i;
node->id = list->count;
node->entity = entity;
dllpushback(list->first, list->last, node);
return node->id;
}
void delete_entity(i32 id, elist_t *list)
{
assert(list);
for (enode_t *node = list->first; node; node = node->next) {
if (node->id == id) {
dllremove(list->first, list->last, node);
memzero_struct(node);
list->count--;
printf("info: entity %d deleted\n", id);
return;
}
}
printf("error: entity %d failed to delete\n", id);
}
entity_t *get_entity(elist_t list, i32 id)
{
for (enode_t *node = list.first; node; node = node->next)
if (node->id == id)
return &node->entity;
return 0;
}
i32 aabb3d(bbox_t a, bbox_t b)
{
i32 result = ((b.start.x <= a.end.x) && (b.end.x >= a.start.x)) &&
((b.start.y <= a.end.y) && (b.end.y >= a.start.y)) &&
((b.start.z <= a.end.z) && (b.end.z >= a.start.z));
return result;
}
i32 check_collision(entity_t *a, entity_t *b)
{
if (!(a->flags & ENTITY_COLLIDE) || !(b->flags & ENTITY_COLLIDE))
return 0;
bbox_t bboxa = {
v3_add(a->bbox.start, a->position),
v3_add(a->bbox.end, a->position)
};
bbox_t bboxb = {
v3_add(b->bbox.start, b->position),
v3_add(b->bbox.end, b->position)
};
i32 result = aabb3d(bboxa, bboxb);
return result;
}
entity_t move_entity(entity_t old, v3 acceleration, float dt)
{
entity_t new = old;
new.position = v3_add(old.position, v3_scalef(old.velocity, dt));
new.velocity = v3_add(old.velocity, v3_scalef(acceleration, dt*dt));
new.velocity = v3_sub(new.velocity, v3_scalef(V3_UP, dt));
return new;
}
/*
void update_entities(elist_t list)
{
for (enode_t *node = list.first; node; node = node->next) {
if (node->entity.flags & ENTITY_MOVE)
move_entity(node->entity, );
if (node->entity.flags & ENTITY_COLLIDE) {
for (enode_t *test = list.first; test; test = test->next) {
if (check_collision(node->entity, test->entity)) {
}
}
}
}
}
*/
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