Function RenderRoomObjects

Descent3/render.cpp:3120–3261

Render the objects and viseffects in a room. Do a simple sort

uint8_t Trick_type = 0;
// Render the objects and viseffects in a room.  Do a simple sort
void RenderRoomObjects(room *rp) {
  int n_objs = 0, objnum, i, visnum;
  float zdist;
  if (!Render_mirror_for_room && UseHardware)
    return; // This function only works for mirrors now

  // Add objects to sort list
  for (objnum = rp->objects; (objnum != -1) && (n_objs < MAX_OBJECTS_PER_ROOM); objnum = Objects[objnum].next) {
    ASSERT(objnum != Objects[objnum].next);
    object *obj = &Objects[objnum];

    if (obj->render_type == RT_NONE)
      continue;
    if (obj == Viewer_object && !Render_mirror_for_room)
      continue;
    float size = obj->size;
    // Special case weapons with streamers
    if (obj->type == OBJ_WEAPON && (Weapons[obj->id].flags & WF_STREAMER))
      size = Weapons[obj->id].phys_info.velocity.z;
    // Check if object is trivially rejected
    bool isVisible = IsPointVisible(&obj->pos, size, &zdist) ? true : false;
    if (Render_mirror_for_room || (obj->type == OBJ_WEAPON && Weapons[obj->id].flags & WF_ELECTRICAL) || isVisible) {
      obj_sort_list[n_objs].vis_effect = 0;
      obj_sort_list[n_objs].objnum = objnum;
      obj_sort_list[n_objs].dist = zdist;
      n_objs++;
    }
  }
  // Add vis effects to sort list
  for (visnum = rp->vis_effects; (visnum != -1) && (n_objs < MAX_OBJECTS_PER_ROOM); visnum = VisEffects[visnum].next) {
    ASSERT(visnum != VisEffects[visnum].next);
    if (VisEffects[visnum].type == VIS_NONE || VisEffects[visnum].flags & VF_DEAD)
      continue;

    bool pointIsVisible = IsPointVisible(&VisEffects[visnum].pos, VisEffects[visnum].size, &zdist) ? true : false;
    if (Render_mirror_for_room || pointIsVisible) {
      obj_sort_list[n_objs].vis_effect = 1;
      obj_sort_list[n_objs].objnum = visnum;
      obj_sort_list[n_objs].dist = zdist;
      n_objs++;
    }
  }
  ASSERT(objnum == -1); // if not -1, ran out of space in render_order[]
  ASSERT(visnum == -1); // if not -1, ran out of space in render_order[]
  // Sort the objects
  qsort(obj_sort_list, n_objs, sizeof(*obj_sort_list), (int (*)(const void *, const void *))obj_sort_func);
#ifdef _DEBUG
  bool save_polymodel_outline_mode = Polymodel_outline_mode;
  Polymodel_outline_mode = OUTLINE_ON(OM_OBJECTS);
#endif
  // Render the objects
  if (UseHardware && Render_mirror_for_room) {
    // Render the mirror stuff if present
    room *mirror_rp = &Rooms[Mirror_room];
    vector *mirror_vec = &mirror_rp->verts[mirror_rp->faces[mirror_rp->mirror_face].face_verts[0]];
    face *mirror_fp = &mirror_rp->faces[mirror_rp->mirror_face];
    vector *norm = &mirror_fp->normal;
    // This is how far the mirror face is from the normalized plane