assimp/test/unit/utglTF2ImportExport.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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Copyright (c) 2006-2019, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,
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* Redistributions of source code must retain the above
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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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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
#include "UnitTestPCH.h"
#include "AbstractImportExportBase.h"

#include <assimp/Importer.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/postprocess.h>
#include <assimp/scene.h>
#include <assimp/commonMetaData.h>

#include <array>

#include <assimp/pbrmaterial.h>

using namespace Assimp;

class utglTF2ImportExport : public AbstractImportExportBase {
public:
    virtual bool importerTest() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf",
            aiProcess_ValidateDataStructure);
        EXPECT_NE( scene, nullptr );
        if (!scene) {
            return false;
        }

        EXPECT_TRUE( scene->HasMaterials() );
        if (!scene->HasMaterials()) {
            return false;
        }
        const aiMaterial *material = scene->mMaterials[0];

        aiString path;
        aiTextureMapMode modes[2];
        EXPECT_EQ( aiReturn_SUCCESS, material->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr,
            nullptr, nullptr, modes) );
        EXPECT_STREQ( path.C_Str(), "CesiumLogoFlat.png" );
        EXPECT_EQ( modes[0], aiTextureMapMode_Mirror );
        EXPECT_EQ( modes[1], aiTextureMapMode_Clamp );

        return true;
    }

    virtual bool binaryImporterTest() {
        Assimp::Importer importer;
        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/glTF2/2CylinderEngine-glTF-Binary/2CylinderEngine.glb",
            aiProcess_ValidateDataStructure);
        return nullptr != scene;
    }

#ifndef ASSIMP_BUILD_NO_EXPORT
    virtual bool exporterTest() {
        Assimp::Importer importer;
        Assimp::Exporter exporter;
        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf",
            aiProcess_ValidateDataStructure );
        EXPECT_NE( nullptr, scene );
        EXPECT_EQ( aiReturn_SUCCESS, exporter.Export( scene, "gltf2", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured_out.gltf" ) );

        return true;
    }
#endif // ASSIMP_BUILD_NO_EXPORT

};

TEST_F( utglTF2ImportExport, importglTF2FromFileTest ) {
    EXPECT_TRUE( importerTest() );
}

TEST_F( utglTF2ImportExport, importBinaryglTF2FromFileTest ) {
    EXPECT_TRUE( binaryImporterTest() );
}

#ifndef ASSIMP_BUILD_NO_EXPORT
TEST_F(utglTF2ImportExport, importglTF2AndExportToOBJ) {
    Assimp::Importer importer;
    Assimp::Exporter exporter;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf",
        aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "obj", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured_out.obj"));
}

TEST_F(utglTF2ImportExport, importglTF2EmbeddedAndExportToOBJ) {
    Assimp::Importer importer;
    Assimp::Exporter exporter;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-Embedded/BoxTextured.gltf",
        aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "obj", ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF-Embedded/BoxTextured_out.obj"));
}
#endif // ASSIMP_BUILD_NO_EXPORT

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModePointsWithoutIndices) {
    Assimp::Importer importer;
    //Points without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_00.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 1024u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mNumIndices, 1u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], i);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLinesWithoutIndices) {
    Assimp::Importer importer;
    //Lines without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_01.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 8u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mNumIndices, 2u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], i*2u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], i*2u + 1u);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLinesLoopWithoutIndices) {
    Assimp::Importer importer;
    //Lines loop without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_02.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);

    std::array<unsigned int, 5> l1 = {{ 0u, 1u, 2u, 3u, 0u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 2u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mNumIndices, 2u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], l1[i]);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], l1[i + 1u]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLinesStripWithoutIndices) {
    Assimp::Importer importer;
    //Lines strip without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_03.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 5u);

    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 2u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mNumIndices, 2u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], i);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], i + 1u);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeTrianglesStripWithoutIndices) {
    Assimp::Importer importer;
    //Triangles strip without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_04.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 3> f1 = {{ 0u, 1u, 2u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 3u);
    for (unsigned int i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mIndices[i], f1[i]);
    }

    std::array<unsigned int, 3> f2 = {{ 2u, 1u, 3u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mIndices[i], f2[i]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeTrianglesFanWithoutIndices) {
    Assimp::Importer importer;
    //Triangles fan without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_05.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 3> f1 = {{ 0u, 1u, 2u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mIndices[i], f1[i]);
    }

    std::array<unsigned int, 3> f2 = {{ 0u, 2u, 3u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mIndices[i], f2[i]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeTrianglesWithoutIndices) {
    Assimp::Importer importer;
    //Triangles without indices
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_06.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 6u);
    std::array<unsigned int, 3> f1 = {{ 0u, 1u, 2u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mIndices[i], f1[i]);
    }

    std::array<unsigned int, 3> f2 = {{ 3u, 4u, 5u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mIndices[i], f2[i]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModePoints) {
    Assimp::Importer importer;
    //Line loop
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_07.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 1024u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mNumIndices, 1u);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], i);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLines) {
    Assimp::Importer importer;
    //Lines
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_08.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 5> l1 = {{ 0u, 3u, 2u, 1u, 0u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 2u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i)
    {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], l1[i]);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], l1[i + 1]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLineLoop) {
    Assimp::Importer importer;
    //Line loop
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_09.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 5> l1 = {{ 0, 3u, 2u, 1u, 0u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 2u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i)
    {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], l1[i]);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], l1[i+1]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeLineStrip) {
    Assimp::Importer importer;
    //Lines Strip
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_10.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 5> l1 = {{ 0u, 3u, 2u, 1u, 0u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 2u);
    for (unsigned int i = 0; i < scene->mMeshes[0]->mNumFaces; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[0], l1[i]);
        EXPECT_EQ(scene->mMeshes[0]->mFaces[i].mIndices[1], l1[i + 1]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeTrianglesStrip) {
    Assimp::Importer importer;
    //Triangles strip
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_11.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    std::array<unsigned int, 3> f1 = {{ 0u, 3u, 1u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mIndices[i], f1[i]);
    }

    std::array<unsigned int, 3> f2 = {{ 1u, 3u, 2u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mNumIndices, 3u);
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mIndices[i], f2[i]);
    }
}

TEST_F(utglTF2ImportExport, importglTF2PrimitiveModeTrianglesFan) {
    Assimp::Importer importer;
    //Triangles fan
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Asset-Generator/Mesh_PrimitiveMode/Mesh_PrimitiveMode_12.gltf", aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 4u);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
    std::array<unsigned int, 3> f1 = {{ 0u, 3u, 2u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mNumIndices, 3u );
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[0].mIndices[i], f1[i]);
    }

    std::array<unsigned int, 3> f2 = {{ 0u, 2u, 1u }};
    EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mNumIndices, 3u );
    for (size_t i = 0; i < 3; ++i) {
        EXPECT_EQ(scene->mMeshes[0]->mFaces[1].mIndices[i], f2[i]);
    }
}

std::vector<char> ReadFile(const char* name) {
    std::vector<char> ret;

    FILE* p = ::fopen(name, "r");
    if (nullptr == p) {
        return ret;
    }

    ::fseek(p, 0, SEEK_END);
    const size_t size = ::ftell(p);
    ::fseek(p, 0, SEEK_SET);

    ret.resize(size);
    const size_t readSize = ::fread(&ret[0], 1, size, p);
    EXPECT_EQ(readSize, size);
    ::fclose(p);

    return ret;
}

TEST_F(utglTF2ImportExport, importglTF2FromMemory) {
    /*const auto flags = aiProcess_CalcTangentSpace | aiProcess_Triangulate | aiProcess_RemoveComponent |
        aiProcess_GenSmoothNormals | aiProcess_PreTransformVertices | aiProcess_FixInfacingNormals |
        aiProcess_FindDegenerates | aiProcess_GenUVCoords | aiProcess_SortByPType;
    const auto& buff = ReadFile("C:\\Users\\kimkulling\\Downloads\\camel\\camel\\scene.gltf");*/
    /*const aiScene* Scene = ::aiImportFileFromMemory(&buff[0], buff.size(), flags, ".gltf");
    EXPECT_EQ( nullptr, Scene );*/
}

TEST_F( utglTF2ImportExport, bug_import_simple_skin ) {
    Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/glTF2/simple_skin/simple_skin.gltf",
        aiProcess_ValidateDataStructure );
    EXPECT_NE( nullptr, scene );
}

TEST_F(utglTF2ImportExport, import_cameras) {
    Assimp::Importer importer;
    const aiScene* scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/cameras/Cameras.gltf",
        aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
}

TEST_F(utglTF2ImportExport, incorrect_vertex_arrays) {
    Assimp::Importer importer;
    const aiScene* scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/IncorrectVertexArrays/Cube.gltf",
        aiProcess_ValidateDataStructure);
    EXPECT_NE(nullptr, scene);
    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 36u);
    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 12u);
    EXPECT_EQ(scene->mMeshes[1]->mNumVertices, 35u);
    EXPECT_EQ(scene->mMeshes[1]->mNumFaces, 11u);
    EXPECT_EQ(scene->mMeshes[2]->mNumVertices, 36u);
    EXPECT_EQ(scene->mMeshes[2]->mNumFaces, 18u);
    EXPECT_EQ(scene->mMeshes[3]->mNumVertices, 35u);
    EXPECT_EQ(scene->mMeshes[3]->mNumFaces, 17u);
    EXPECT_EQ(scene->mMeshes[4]->mNumVertices, 36u);
    EXPECT_EQ(scene->mMeshes[4]->mNumFaces, 12u);
    EXPECT_EQ(scene->mMeshes[5]->mNumVertices, 35u);
    EXPECT_EQ(scene->mMeshes[5]->mNumFaces, 11u);
    EXPECT_EQ(scene->mMeshes[6]->mNumVertices, 36u);
    EXPECT_EQ(scene->mMeshes[6]->mNumFaces, 18u);
    EXPECT_EQ(scene->mMeshes[7]->mNumVertices, 35u);
    EXPECT_EQ(scene->mMeshes[7]->mNumFaces, 17u);
}

TEST_F( utglTF2ImportExport, texture_transform_test ) {
	Assimp::Importer importer;
	const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/textureTransform/TextureTransformTest.gltf",
			aiProcess_ValidateDataStructure);
	EXPECT_NE(nullptr, scene);
}

#ifndef ASSIMP_BUILD_NO_EXPORT
TEST_F( utglTF2ImportExport, exportglTF2FromFileTest ) {
    EXPECT_TRUE( exporterTest() );
}

TEST_F( utglTF2ImportExport, crash_in_anim_mesh_destructor ) {
    Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Sample-Models/AnimatedMorphCube-glTF/AnimatedMorphCube.gltf",
        aiProcess_ValidateDataStructure);
    ASSERT_NE( nullptr, scene );
    Assimp::Exporter exporter;
    ASSERT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "glb2", ASSIMP_TEST_MODELS_DIR "/glTF2/glTF-Sample-Models/AnimatedMorphCube-glTF/AnimatedMorphCube_out.glTF"));
}

TEST_F(utglTF2ImportExport, error_string_preserved) {
    Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/MissingBin/BoxTextured.gltf",
        aiProcess_ValidateDataStructure);
    ASSERT_EQ(nullptr, scene);
    std::string error = importer.GetErrorString();
    ASSERT_NE(error.find("BoxTextured0.bin"), std::string::npos) << "Error string should contain an error about missing .bin file";
}

#endif // ASSIMP_BUILD_NO_EXPORT

TEST_F(utglTF2ImportExport, sceneMetadata) {
    Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTextured-glTF/BoxTextured.gltf",
        aiProcess_ValidateDataStructure);
    ASSERT_NE(scene, nullptr);
    ASSERT_NE(scene->mMetaData, nullptr);
    {
        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_FORMAT));
        aiString format;
        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, format));
        ASSERT_EQ(strcmp(format.C_Str(), "glTF2 Importer"), 0);
    }
    {
        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_FORMAT_VERSION));
        aiString version;
        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT_VERSION, version));
        ASSERT_EQ(strcmp(version.C_Str(), "2.0"), 0);
    }
    {
        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_GENERATOR));
        aiString generator;
        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_GENERATOR, generator));
        ASSERT_EQ(strcmp(generator.C_Str(), "COLLADA2GLTF"), 0);
    }
}

TEST_F(utglTF2ImportExport, texcoords) {
    Assimp::Importer importer;
    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/glTF2/BoxTexcoords-glTF/boxTexcoords.gltf",
        aiProcess_ValidateDataStructure);
    ASSERT_NE(scene, nullptr);

    ASSERT_TRUE(scene->HasMaterials());
    const aiMaterial *material = scene->mMaterials[0];

    aiString path;
    aiTextureMapMode modes[2];
    EXPECT_EQ(aiReturn_SUCCESS, material->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr,
        nullptr, nullptr, modes));
    EXPECT_STREQ(path.C_Str(), "texture.png");

    int uvIndex = -1;
    EXPECT_EQ(aiGetMaterialInteger(material, AI_MATKEY_GLTF_TEXTURE_TEXCOORD(aiTextureType_DIFFUSE, 0), &uvIndex), aiReturn_SUCCESS);
    EXPECT_EQ(uvIndex, 0);

    // Using manual macro expansion of AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE here.
    // The following works with some but not all compilers:
    // #define APPLY(X, Y) X(Y)
    // ..., APPLY(AI_MATKEY_GLTF_TEXTURE_TEXCOORD, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE), ...
    EXPECT_EQ(aiGetMaterialInteger(material, AI_MATKEY_GLTF_TEXTURE_TEXCOORD(aiTextureType_UNKNOWN, 0), &uvIndex), aiReturn_SUCCESS);
    EXPECT_EQ(uvIndex, 1);
}