This function is used to create a camera entity.
dg_entity_t *dg_ent_camera(int x, int y);
dg_scene_add_ent(v->scene_game, dg_ent_camera(0, 0));
dg_entity_t *dg_ent_camera(int x, int y)
{
dg_entity_t *entity = dg_entity_create("camera");
dg_entity_add_component(entity, dg_cpt_pos(x, y));
return entity;
}