assimp/code/AssetLib/glTF2/glTF2Exporter.h

/*
Open Asset Import Library (assimp)
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All rights reserved.

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* Redistributions in binary form must reproduce the above
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* Neither the name of the assimp team, nor the names of its
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

/** @file GltfExporter.h
* Declares the exporter class to write a scene to a gltf/glb file
*/
#ifndef AI_GLTF2EXPORTER_H_INC
#define AI_GLTF2EXPORTER_H_INC

#if !defined(ASSIMP_BUILD_NO_GLTF_IMPORTER) && !defined(ASSIMP_BUILD_NO_GLTF2_IMPORTER)

#include <assimp/material.h>
#include <assimp/types.h>

#include <map>
#include <memory>
#include <sstream>
#include <vector>

struct aiScene;
struct aiNode;
struct aiMaterial;

namespace glTFCommon {
template <class T>
class Ref;

}

namespace glTF2 {
class Asset;
struct TexProperty;
struct TextureInfo;
struct NormalTextureInfo;
struct OcclusionTextureInfo;
struct Node;
struct Texture;
struct PbrSpecularGlossiness;
struct MaterialSheen;
struct MaterialClearcoat;
struct MaterialTransmission;
struct MaterialVolume;
struct MaterialIOR;

// Vec/matrix types, as raw float arrays
typedef float(vec2)[2];
typedef float(vec3)[3];
typedef float(vec4)[4];
} // namespace glTF2

namespace Assimp {
class IOSystem;
class IOStream;
class ExportProperties;

// ------------------------------------------------------------------------------------------------
/** Helper class to export a given scene to an glTF file. */
// ------------------------------------------------------------------------------------------------
class glTF2Exporter {
public:
    /// Constructor for a specific scene to export
    glTF2Exporter(const char *filename, IOSystem *pIOSystem, const aiScene *pScene,
            const ExportProperties *pProperties, bool binary);
    ~glTF2Exporter();

protected:
    void WriteBinaryData(IOStream *outfile, std::size_t sceneLength);
    void GetTexSampler(const aiMaterial &mat, glTFCommon::Ref<glTF2::Texture> texture, aiTextureType tt, unsigned int slot);
    void GetMatTexProp(const aiMaterial &mat, unsigned int &prop, const char *propName, aiTextureType tt, unsigned int idx);
    void GetMatTexProp(const aiMaterial &mat, float &prop, const char *propName, aiTextureType tt, unsigned int idx);
    void GetMatTex(const aiMaterial &mat, glTFCommon::Ref<glTF2::Texture> &texture, unsigned int &texCoord, aiTextureType tt, unsigned int slot);
    void GetMatTex(const aiMaterial &mat, glTF2::TextureInfo &prop, aiTextureType tt, unsigned int slot);
    void GetMatTex(const aiMaterial &mat, glTF2::NormalTextureInfo &prop, aiTextureType tt, unsigned int slot);
    void GetMatTex(const aiMaterial &mat, glTF2::OcclusionTextureInfo &prop, aiTextureType tt, unsigned int slot);
    aiReturn GetMatColor(const aiMaterial &mat, glTF2::vec4 &prop, const char *propName, int type, int idx) const;
    aiReturn GetMatColor(const aiMaterial &mat, glTF2::vec3 &prop, const char *propName, int type, int idx) const;
    bool GetMatSpecGloss(const aiMaterial &mat, glTF2::PbrSpecularGlossiness &pbrSG);
    bool GetMatSheen(const aiMaterial &mat, glTF2::MaterialSheen &sheen);
    bool GetMatClearcoat(const aiMaterial &mat, glTF2::MaterialClearcoat &clearcoat);
    bool GetMatTransmission(const aiMaterial &mat, glTF2::MaterialTransmission &transmission);
    bool GetMatVolume(const aiMaterial &mat, glTF2::MaterialVolume &volume);
    bool GetMatIOR(const aiMaterial &mat, glTF2::MaterialIOR &ior);
    void ExportMetadata();
    void ExportMaterials();
    void ExportMeshes();
    void MergeMeshes();
    unsigned int ExportNodeHierarchy(const aiNode *n);
    unsigned int ExportNode(const aiNode *node, glTFCommon::Ref<glTF2::Node> &parent);
    void ExportScene();
    void ExportAnimations();

private:
    const char *mFilename;
    IOSystem *mIOSystem;
    const aiScene *mScene;
    const ExportProperties *mProperties;
    std::map<std::string, unsigned int> mTexturesByPath;
    std::shared_ptr<glTF2::Asset> mAsset;
    std::vector<unsigned char> mBodyData;
};

} // namespace Assimp

#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER

#endif // AI_GLTF2EXPORTER_H_INC