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

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

struct aiScene;
struct aiNode;
struct aiMaterial;

namespace glTF2
{
    template<class T>
    class Ref;

    class Asset;
    struct TexProperty;
    struct TextureInfo;
    struct NormalTextureInfo;
    struct OcclusionTextureInfo;
    struct Node;
    struct Texture;
    struct PbrSpecularGlossiness;
    struct MaterialSheen;
    struct MaterialClearcoat;
    struct MaterialTransmission;

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

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, glTF2::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, glTF2::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);
        void ExportMetadata();
        void ExportMaterials();
        void ExportMeshes();
        void MergeMeshes();
        unsigned int ExportNodeHierarchy(const aiNode* n);
        unsigned int ExportNode(const aiNode* node, glTF2::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;
    };

}

#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER

#endif // AI_GLTF2EXPORTER_H_INC