MaterialExporter.h

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <string>
#include <vector>
 
#include "COLLADASWLibraryMaterials.h"
#include "COLLADASWStreamWriter.h"
 
#include "BKE_material.h"
 
#include "DNA_material_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
 
#include "ExportSettings.h"
#include "GeometryExporter.h"
#include "Materials.h"
#include "collada_internal.h"
 
class MaterialsExporter : COLLADASW::LibraryMaterials {
 public:
  MaterialsExporter(COLLADASW::StreamWriter *sw, BCExportSettings &export_settings);
  void exportMaterials(Scene *sce);
  void operator()(Material *ma, Object *ob);
 
 private:
  bool hasMaterials(Scene *sce);
  BCExportSettings &export_settings;
};
 
/* Used in `forEachMaterialInScene`. */
template<class Functor> class ForEachMaterialFunctor {
  std::vector<std::string>
      mMat; /* contains list of material names, to avoid duplicate calling of f */
  Functor *f;
 
 public:
  ForEachMaterialFunctor(Functor *f) : f(f) {}
 
  void operator()(Object *ob)
  {
    int a;
    for (a = 0; a < ob->totcol; a++) {
 
      Material *ma = BKE_object_material_get(ob, a + 1);
 
      if (!ma) {
        continue;
      }
 
      std::string translated_id = translate_id(id_name(ma));
      if (find(mMat.begin(), mMat.end(), translated_id) == mMat.end()) {
        (*this->f)(ma, ob);
 
        mMat.push_back(translated_id);
      }
    }
  }
};
 
struct MaterialFunctor {
  /* calls f for each unique material linked to each object in sce
   * f should have */
  // void operator()(Material *ma)
  template<class Functor>
  void forEachMaterialInExportSet(Scene *sce, Functor &f, LinkNode *export_set)
  {
    ForEachMaterialFunctor<Functor> matfunc(&f);
    GeometryFunctor gf;
    gf.forEachMeshObjectInExportSet<ForEachMaterialFunctor<Functor>>(sce, matfunc, export_set);
  }
};