blenkernel/intern/light.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <cstdlib>
#include <optional>
 
#include "MEM_guardedalloc.h"
 
/* Allow using deprecated functionality for .blend file I/O. */
#define DNA_DEPRECATED_ALLOW
 
#include "DNA_defaults.h"
#include "DNA_light_types.h"
#include "DNA_node_types.h"
#include "DNA_scene_types.h"
#include "DNA_texture_types.h"
 
#include "BLI_utildefines.h"
 
#include "BKE_icons.h"
#include "BKE_idtype.hh"
#include "BKE_lib_id.hh"
#include "BKE_lib_query.hh"
#include "BKE_light.h"
#include "BKE_node.hh"
#include "BKE_preview_image.hh"
 
#include "BLT_translation.hh"
 
#include "DEG_depsgraph.hh"
 
#include "BLO_read_write.hh"
 
static void light_init_data(ID *id)
{
  Light *la = (Light *)id;
  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(la, id));
 
  MEMCPY_STRUCT_AFTER(la, DNA_struct_default_get(Light), id);
}
 
static void light_copy_data(Main *bmain,
                            std::optional<Library *> owner_library,
                            ID *id_dst,
                            const ID *id_src,
                            const int flag)
{
  Light *la_dst = (Light *)id_dst;
  const Light *la_src = (const Light *)id_src;
 
  const bool is_localized = (flag & LIB_ID_CREATE_LOCAL) != 0;
  /* We always need allocation of our private ID data.
   * User reference-counting is also handled by calling code,
   * so the duplication calls for embedded data should _never_ handle it from here. */
  const int flag_embedded_id_data = (flag & ~LIB_ID_CREATE_NO_ALLOCATE) |
                                    LIB_ID_CREATE_NO_USER_REFCOUNT;
 
  if (la_src->nodetree) {
    if (is_localized) {
      la_dst->nodetree = blender::bke::node_tree_localize(la_src->nodetree, &la_dst->id);
    }
    else {
      BKE_id_copy_in_lib(bmain,
                         owner_library,
                         &la_src->nodetree->id,
                         &la_dst->id,
                         reinterpret_cast<ID **>(&la_dst->nodetree),
                         flag_embedded_id_data);
    }
  }
 
  if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
    BKE_previewimg_id_copy(&la_dst->id, &la_src->id);
  }
  else {
    la_dst->preview = nullptr;
  }
}
 
static void light_free_data(ID *id)
{
  Light *la = (Light *)id;
 
  /* is no lib link block, but light extension */
  if (la->nodetree) {
    blender::bke::node_tree_free_embedded_tree(la->nodetree);
    MEM_freeN(la->nodetree);
    la->nodetree = nullptr;
  }
 
  BKE_previewimg_free(&la->preview);
  BKE_icon_id_delete(&la->id);
  la->id.icon_id = 0;
}
 
static void light_foreach_id(ID *id, LibraryForeachIDData *data)
{
  Light *lamp = reinterpret_cast<Light *>(id);
  const int flag = BKE_lib_query_foreachid_process_flags_get(data);
 
  if (lamp->nodetree) {
    /* nodetree **are owned by IDs**, treat them as mere sub-data and not real ID! */
    BKE_LIB_FOREACHID_PROCESS_FUNCTION_CALL(
        data, BKE_library_foreach_ID_embedded(data, (ID **)&lamp->nodetree));
  }
 
  if (flag & IDWALK_DO_DEPRECATED_POINTERS) {
    BKE_LIB_FOREACHID_PROCESS_ID_NOCHECK(data, lamp->ipo, IDWALK_CB_USER);
  }
}
 
static void light_blend_write(BlendWriter *writer, ID *id, const void *id_address)
{
  Light *la = (Light *)id;
 
  /* Forward compatibility for energy. */
  la->energy_deprecated = la->energy;
  if (la->type == LA_AREA) {
    la->energy_deprecated /= M_PI_4;
  }
 
  /* write LibData */
  BLO_write_id_struct(writer, Light, id_address, &la->id);
  BKE_id_blend_write(writer, &la->id);
 
  /* Node-tree is integral part of lights, no libdata. */
  if (la->nodetree) {
    BLO_Write_IDBuffer *temp_embedded_id_buffer = BLO_write_allocate_id_buffer();
    BLO_write_init_id_buffer_from_id(
        temp_embedded_id_buffer, &la->nodetree->id, BLO_write_is_undo(writer));
    BLO_write_struct_at_address(
        writer, bNodeTree, la->nodetree, BLO_write_get_id_buffer_temp_id(temp_embedded_id_buffer));
    blender::bke::node_tree_blend_write(
        writer, (bNodeTree *)BLO_write_get_id_buffer_temp_id(temp_embedded_id_buffer));
    BLO_write_destroy_id_buffer(&temp_embedded_id_buffer);
  }
 
  BKE_previewimg_blend_write(writer, la->preview);
}
 
static void light_blend_read_data(BlendDataReader *reader, ID *id)
{
  Light *la = (Light *)id;
 
  BLO_read_struct(reader, PreviewImage, &la->preview);
  BKE_previewimg_blend_read(reader, la->preview);
}
 
IDTypeInfo IDType_ID_LA = {
    /*id_code*/ ID_LA,
    /*id_filter*/ FILTER_ID_LA,
    /*dependencies_id_types*/ FILTER_ID_TE,
    /*main_listbase_index*/ INDEX_ID_LA,
    /*struct_size*/ sizeof(Light),
    /*name*/ "Light",
    /*name_plural*/ N_("lights"),
    /*translation_context*/ BLT_I18NCONTEXT_ID_LIGHT,
    /*flags*/ IDTYPE_FLAGS_APPEND_IS_REUSABLE,
    /*asset_type_info*/ nullptr,
 
    /*init_data*/ light_init_data,
    /*copy_data*/ light_copy_data,
    /*free_data*/ light_free_data,
    /*make_local*/ nullptr,
    /*foreach_id*/ light_foreach_id,
    /*foreach_cache*/ nullptr,
    /*foreach_path*/ nullptr,
    /*owner_pointer_get*/ nullptr,
 
    /*blend_write*/ light_blend_write,
    /*blend_read_data*/ light_blend_read_data,
    /*blend_read_after_liblink*/ nullptr,
 
    /*blend_read_undo_preserve*/ nullptr,
 
    /*lib_override_apply_post*/ nullptr,
};
 
Light *BKE_light_add(Main *bmain, const char *name)
{
  Light *la;
 
  la = static_cast<Light *>(BKE_id_new(bmain, ID_LA, name));
 
  return la;
}
 
void BKE_light_eval(Depsgraph *depsgraph, Light *la)
{
  DEG_debug_print_eval(depsgraph, __func__, la->id.name, la);
}