assimp/code/AssetLib/Blender/BlenderLoader.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

/** @file  BlenderLoader.h
 *  @brief Declaration of the Blender 3D (*.blend) importer class.
 */
#pragma once
#ifndef INCLUDED_AI_BLEND_LOADER_H
#define INCLUDED_AI_BLEND_LOADER_H

#include <assimp/BaseImporter.h>
#include <assimp/LogAux.h>
#include <memory>

struct aiNode;
struct aiMesh;
struct aiLight;
struct aiCamera;
struct aiMaterial;

namespace Assimp {

// TinyFormatter.h
namespace Formatter {

template <typename T, typename TR, typename A>
class basic_formatter;

typedef class basic_formatter<char, std::char_traits<char>, std::allocator<char>> format;

} // namespace Formatter

// BlenderDNA.h
namespace Blender {
class FileDatabase;
struct ElemBase;
} // namespace Blender

// BlenderScene.h
namespace Blender {
struct Scene;
struct Object;
struct Collection;
struct Mesh;
struct Camera;
struct Lamp;
struct MTex;
struct Image;
struct Material;
} // namespace Blender

// BlenderIntermediate.h
namespace Blender {
struct ConversionData;
template <template <typename, typename> class TCLASS, typename T>
struct TempArray;
} // namespace Blender

// BlenderModifier.h
namespace Blender {
class BlenderModifierShowcase;
class BlenderModifier;
} // namespace Blender

// -------------------------------------------------------------------------------------------
/** Load blenders official binary format. The actual file structure (the `DNA` how they
 *  call it is outsourced to BlenderDNA.cpp/BlenderDNA.h. This class only performs the
 *  conversion from intermediate format to aiScene. */
// -------------------------------------------------------------------------------------------
class BlenderImporter : public BaseImporter, public LogFunctions<BlenderImporter> {
public:
    BlenderImporter();
    ~BlenderImporter() override;
    bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;

protected:
    const aiImporterDesc *GetInfo() const override;
    void SetupProperties(const Importer *pImp) override;
    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;
    void ParseBlendFile(Blender::FileDatabase &out, std::shared_ptr<IOStream> stream);
    void ExtractScene(Blender::Scene &out, const Blender::FileDatabase &file);
    void ParseSubCollection(const Blender::Scene &in, aiNode *root, const std::shared_ptr<Blender::Collection>& collection, Blender::ConversionData &conv_data);
    void ConvertBlendFile(aiScene *out, const Blender::Scene &in, const Blender::FileDatabase &file);

private:
    aiNode *ConvertNode(const Blender::Scene &in,
            const Blender::Object *obj,
            Blender::ConversionData &conv_info,
            const aiMatrix4x4 &parentTransform);

    // --------------------
    void ConvertMesh(const Blender::Scene &in,
            const Blender::Object *obj,
            const Blender::Mesh *mesh,
            Blender::ConversionData &conv_data,
            Blender::TempArray<std::vector, aiMesh> &temp);

    // --------------------
    aiLight *ConvertLight(const Blender::Scene &in,
            const Blender::Object *obj,
            const Blender::Lamp *mesh,
            Blender::ConversionData &conv_data);

    // --------------------
    aiCamera *ConvertCamera(const Blender::Scene &in,
            const Blender::Object *obj,
            const Blender::Camera *mesh,
            Blender::ConversionData &conv_data);

    // --------------------
    void BuildDefaultMaterial(
            Blender::ConversionData &conv_data);

    // --------------------
    void AddBlendParams(
            aiMaterial *result,
            const Blender::Material *source);

    // --------------------
    void BuildMaterials(
            Blender::ConversionData &conv_data);

    // --------------------
    void ResolveTexture(
            aiMaterial *out,
            const Blender::Material *mat,
            const Blender::MTex *tex,
            Blender::ConversionData &conv_data);

    // --------------------
    void ResolveImage(
            aiMaterial *out,
            const Blender::Material *mat,
            const Blender::MTex *tex,
            const Blender::Image *img,
            Blender::ConversionData &conv_data);

    // --------------------
    void AddSentinelTexture(
            aiMaterial *out,
            const Blender::Material *mat,
            const Blender::MTex *tex,
            Blender::ConversionData &conv_data);

    // TODO: Move to a std::variant, once c++17 is supported.
    struct StreamOrError {
        std::shared_ptr<IOStream> stream;
        std::shared_ptr<std::vector<char>> input;
        std::string error;
    };

    // Returns either a stream (and optional input data for the stream) or
    // an error if it can't parse the magic token.
    StreamOrError ParseMagicToken(
            const std::string &pFile,
            IOSystem *pIOHandler) const;

private: // static stuff, mostly logging and error reporting.
    // --------------------
    static void CheckActualType(const Blender::ElemBase *dt,
            const char *check);

    // --------------------
    static void NotSupportedObjectType(const Blender::Object *obj,
            const char *type);

private:
    Blender::BlenderModifierShowcase *modifier_cache;

}; // !class BlenderImporter

} // end of namespace Assimp
#endif // AI_UNREALIMPORTER_H_INC