Function ClearDynamicLightmaps

Descent3/lighting.cpp:1370–1463

Clears the used flag for the dynamic lightmaps and restores colors on the terrain

// Clears the used flag for the dynamic lightmaps and restores colors on the terrain
void ClearDynamicLightmaps() {
  int i;

  // First clear dynamic lightmap list
  for (i = 0; i < Num_dynamic_lightmaps; i++)
    Dynamic_lightmaps[i].used = 0;

  // Reset volume lights
  for (i = 0; i < Num_volume_objects; i++) {
    object *obj = &Objects[Dynamic_volume_object_list[i].objnum];
    if (obj->type == OBJ_NONE || obj->handle != Dynamic_volume_object_list[i].handle)
      continue; // object was destroyed this frame

    obj->effect_info->type_flags &= ~EF_SPECULAR;
    obj->effect_info->dynamic_this_frame = 0;
    obj->effect_info->dynamic_red = 0;
    obj->effect_info->dynamic_green = 0;
    obj->effect_info->dynamic_blue = 0;
  }

  Num_volume_objects = 0;

  // Reset specular faces
  for (i = 0; i < Num_specular_faces; i++) {
    int n = Specular_face_list[i];
    SpecialFaces[n].flags = 0;
    // LightmapInfo[n].spec_map=-1;
  }

  Num_specular_faces = 0;

  // Clear diffuse faces
  for (i = 0; i < Num_dynamic_faces; i++) {
    if (LightmapInfo[Dynamic_face_list[i].lmi_handle].used == 0)
      continue; // this face was killed last frame.  This can happen with objects

    int dynamic_handle = LightmapInfo[Dynamic_face_list[i].lmi_handle].dynamic;
    int lmi_handle = Dynamic_face_list[i].lmi_handle;
    int lm_handle = LightmapInfo[lmi_handle].lm_handle;
    lightmap_info *lmi_ptr = &LightmapInfo[lmi_handle];

    uint16_t *src_data = Dynamic_lightmaps[dynamic_handle].mem_ptr;
    uint16_t *dest_data = (uint16_t *)lm_data(lm_handle);

    int lmw = lm_w(lm_handle);

    dest_data += (lmi_ptr->y1 * lmw);

    for (int y = 0; y < lmi_ptr->height; y++, dest_data += lmw) {
      for (int x = 0; x < lmi_ptr->width; x++) {
        dest_data[lmi_ptr->x1 + x] = src_data[y * lmi_ptr->width + x];
      }
    }

    GameLightmaps[lm_handle].flags |= (LF_LIMITS | LF_CHANGED);
    LightmapInfo[lmi_handle].dynamic = BAD_LMI_INDEX;
  }