switch to tinyobj and nanovg from assimp and cairo

1 files changed, 0 insertions, 1065 deletions

diff --git a/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp b/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp
deleted file mode 100644
index afcfb12..0000000
--- a/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp
+++ /dev/null
@@ -1,1065 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2022, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-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,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-#ifndef ASSIMP_BUILD_NO_EXPORT
-#ifndef ASSIMP_BUILD_NO_GLTF_EXPORTER
-
-#include "AssetLib/glTF/glTFExporter.h"
-#include "AssetLib/glTF/glTFAssetWriter.h"
-#include "PostProcessing/SplitLargeMeshes.h"
-
-#include <assimp/commonMetaData.h>
-#include <assimp/Exceptional.h>
-#include <assimp/StringComparison.h>
-#include <assimp/ByteSwapper.h>
-#include <assimp/SceneCombiner.h>
-#include <assimp/version.h>
-#include <assimp/IOSystem.hpp>
-#include <assimp/Exporter.hpp>
-#include <assimp/material.h>
-#include <assimp/scene.h>
-
-// Header files, standard library.
-#include <memory>
-#include <limits>
-#include <inttypes.h>
-
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-	// Header files, Open3DGC.
-#	include <Open3DGC/o3dgcSC3DMCEncoder.h>
-#endif
-
-using namespace rapidjson;
-
-using namespace Assimp;
-using namespace glTF;
-
-namespace Assimp {
-
-    // ------------------------------------------------------------------------------------------------
-    // Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp
-    void ExportSceneGLTF(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
-    {
-        // invoke the exporter
-        glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, false);
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    // Worker function for exporting a scene to GLB. Prototyped and registered in Exporter.cpp
-    void ExportSceneGLB(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
-    {
-        // invoke the exporter
-        glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, true);
-    }
-
-} // end of namespace Assimp
-
-glTFExporter::glTFExporter(const char* filename, IOSystem* pIOSystem, const aiScene* pScene,
-                           const ExportProperties* pProperties, bool isBinary)
-    : mFilename(filename)
-    , mIOSystem(pIOSystem)
-    , mProperties(pProperties)
-{
-    aiScene* sceneCopy_tmp;
-    SceneCombiner::CopyScene(&sceneCopy_tmp, pScene);
-
-    SplitLargeMeshesProcess_Triangle tri_splitter;
-    tri_splitter.SetLimit(0xffff);
-    tri_splitter.Execute(sceneCopy_tmp);
-
-    SplitLargeMeshesProcess_Vertex vert_splitter;
-    vert_splitter.SetLimit(0xffff);
-    vert_splitter.Execute(sceneCopy_tmp);
-
-    mScene.reset(sceneCopy_tmp);
-
-    mAsset.reset( new glTF::Asset( pIOSystem ) );
-
-    if (isBinary) {
-        mAsset->SetAsBinary();
-    }
-
-    ExportMetadata();
-
-    //for (unsigned int i = 0; i < pScene->mNumCameras; ++i) {}
-
-    //for (unsigned int i = 0; i < pScene->mNumLights; ++i) {}
-
-    ExportMaterials();
-
-    if (mScene->mRootNode) {
-        ExportNodeHierarchy(mScene->mRootNode);
-    }
-
-    ExportMeshes();
-
-    //for (unsigned int i = 0; i < pScene->mNumTextures; ++i) {}
-
-    ExportScene();
-
-    ExportAnimations();
-
-    glTF::AssetWriter writer(*mAsset);
-
-    if (isBinary) {
-        writer.WriteGLBFile(filename);
-    } else {
-        writer.WriteFile(filename);
-    }
-}
-
-/*
- * Copy a 4x4 matrix from struct aiMatrix to typedef mat4.
- * Also converts from row-major to column-major storage.
- */
-static void CopyValue(const aiMatrix4x4& v, glTF::mat4& o)
-{
-    o[ 0] = v.a1; o[ 1] = v.b1; o[ 2] = v.c1; o[ 3] = v.d1;
-    o[ 4] = v.a2; o[ 5] = v.b2; o[ 6] = v.c2; o[ 7] = v.d2;
-    o[ 8] = v.a3; o[ 9] = v.b3; o[10] = v.c3; o[11] = v.d3;
-    o[12] = v.a4; o[13] = v.b4; o[14] = v.c4; o[15] = v.d4;
-}
-
-static void CopyValue(const aiMatrix4x4& v, aiMatrix4x4& o)
-{
-    memcpy(&o, &v, sizeof(aiMatrix4x4));
-}
-
-static void IdentityMatrix4(glTF::mat4& o)
-{
-    o[ 0] = 1; o[ 1] = 0; o[ 2] = 0; o[ 3] = 0;
-    o[ 4] = 0; o[ 5] = 1; o[ 6] = 0; o[ 7] = 0;
-    o[ 8] = 0; o[ 9] = 0; o[10] = 1; o[11] = 0;
-    o[12] = 0; o[13] = 0; o[14] = 0; o[15] = 1;
-}
-
-template<typename T>
-void SetAccessorRange(Ref<Accessor> acc, void* data, unsigned int count,
-	unsigned int numCompsIn, unsigned int numCompsOut)
-{
-	ai_assert(numCompsOut <= numCompsIn);
-
-	// Allocate and initialize with large values.
-	for (unsigned int i = 0 ; i < numCompsOut ; i++) {
-		acc->min.push_back( std::numeric_limits<double>::max());
-		acc->max.push_back(-std::numeric_limits<double>::max());
-	}
-
-	size_t totalComps = count * numCompsIn;
-	T* buffer_ptr = static_cast<T*>(data);
-	T* buffer_end = buffer_ptr + totalComps;
-
-	// Search and set extreme values.
-	for (; buffer_ptr < buffer_end ; buffer_ptr += numCompsIn) {
-		for (unsigned int j = 0 ; j < numCompsOut ; j++) {
-			double valueTmp = buffer_ptr[j];
-
-			if (valueTmp < acc->min[j]) {
-				acc->min[j] = valueTmp;
-			}
-			if (valueTmp > acc->max[j]) {
-				acc->max[j] = valueTmp;
-			}
-		}
-	}
-}
-
-inline void SetAccessorRange(ComponentType compType, Ref<Accessor> acc, void* data,
-		unsigned int count, unsigned int numCompsIn, unsigned int numCompsOut)
-{
-	switch (compType) {
-		case ComponentType_SHORT:
-			SetAccessorRange<short>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-		case ComponentType_UNSIGNED_SHORT:
-			SetAccessorRange<unsigned short>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-		case ComponentType_UNSIGNED_INT:
-			SetAccessorRange<unsigned int>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-		case ComponentType_FLOAT:
-			SetAccessorRange<float>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-		case ComponentType_BYTE:
-			SetAccessorRange<int8_t>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-		case ComponentType_UNSIGNED_BYTE:
-			SetAccessorRange<uint8_t>(acc, data, count, numCompsIn, numCompsOut);
-			return;
-	}
-}
-
-inline Ref<Accessor> ExportData(Asset &a, std::string &meshName, Ref<Buffer> &buffer,
-        unsigned int count, void *data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE) {
-    if (!count || !data) return Ref<Accessor>();
-
-    unsigned int numCompsIn = AttribType::GetNumComponents(typeIn);
-    unsigned int numCompsOut = AttribType::GetNumComponents(typeOut);
-    unsigned int bytesPerComp = ComponentTypeSize(compType);
-
-    size_t offset = buffer->byteLength;
-    // make sure offset is correctly byte-aligned, as required by spec
-    size_t padding = offset % bytesPerComp;
-    offset += padding;
-    size_t length = count * numCompsOut * bytesPerComp;
-    buffer->Grow(length + padding);
-
-    // bufferView
-    Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
-    bv->buffer = buffer;
-    bv->byteOffset = unsigned(offset);
-    bv->byteLength = length; //! The target that the WebGL buffer should be bound to.
-    bv->target = target;
-
-    // accessor
-    Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
-    acc->bufferView = bv;
-    acc->byteOffset = 0;
-    acc->byteStride = 0;
-    acc->componentType = compType;
-    acc->count = count;
-    acc->type = typeOut;
-
-    // calculate min and max values
-	SetAccessorRange(compType, acc, data, count, numCompsIn, numCompsOut);
-
-    // copy the data
-    acc->WriteData(count, data, numCompsIn*bytesPerComp);
-
-    return acc;
-}
-
-namespace {
-    void GetMatScalar(const aiMaterial* mat, float& val, const char* propName, int type, int idx) {
-        ai_assert( nullptr != mat );
-        if ( nullptr != mat ) {
-            mat->Get(propName, type, idx, val);
-        }
-    }
-}
-
-void glTFExporter::GetTexSampler(const aiMaterial* mat, glTF::TexProperty& prop)
-{
-    std::string samplerId = mAsset->FindUniqueID("", "sampler");
-    prop.texture->sampler = mAsset->samplers.Create(samplerId);
-
-    aiTextureMapMode mapU, mapV;
-    aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0),(int*)&mapU);
-    aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0),(int*)&mapV);
-
-    switch (mapU) {
-        case aiTextureMapMode_Wrap:
-            prop.texture->sampler->wrapS = SamplerWrap_Repeat;
-            break;
-        case aiTextureMapMode_Clamp:
-            prop.texture->sampler->wrapS = SamplerWrap_Clamp_To_Edge;
-            break;
-        case aiTextureMapMode_Mirror:
-            prop.texture->sampler->wrapS = SamplerWrap_Mirrored_Repeat;
-            break;
-        case aiTextureMapMode_Decal:
-        default:
-            prop.texture->sampler->wrapS = SamplerWrap_Repeat;
-            break;
-    };
-
-    switch (mapV) {
-        case aiTextureMapMode_Wrap:
-            prop.texture->sampler->wrapT = SamplerWrap_Repeat;
-            break;
-        case aiTextureMapMode_Clamp:
-            prop.texture->sampler->wrapT = SamplerWrap_Clamp_To_Edge;
-            break;
-        case aiTextureMapMode_Mirror:
-            prop.texture->sampler->wrapT = SamplerWrap_Mirrored_Repeat;
-            break;
-        case aiTextureMapMode_Decal:
-        default:
-            prop.texture->sampler->wrapT = SamplerWrap_Repeat;
-            break;
-    };
-
-    // Hard coded Texture filtering options because I do not know where to find them in the aiMaterial.
-    prop.texture->sampler->magFilter = SamplerMagFilter_Linear;
-    prop.texture->sampler->minFilter = SamplerMinFilter_Linear;
-}
-
-void glTFExporter::GetMatColorOrTex(const aiMaterial* mat, glTF::TexProperty& prop, 
-        const char* propName, int type, int idx, aiTextureType tt) {
-    aiString tex;
-    aiColor4D col;
-    if (mat->GetTextureCount(tt) > 0) {
-        if (mat->Get(AI_MATKEY_TEXTURE(tt, 0), tex) == AI_SUCCESS) {
-            std::string path = tex.C_Str();
-
-            if (path.size() > 0) {
-                if (path[0] != '*') {
-                    std::map<std::string, unsigned int>::iterator it = mTexturesByPath.find(path);
-                    if (it != mTexturesByPath.end()) {
-                        prop.texture = mAsset->textures.Get(it->second);
-                    }
-                }
-
-                if (!prop.texture) {
-                    std::string texId = mAsset->FindUniqueID("", "texture");
-                    prop.texture = mAsset->textures.Create(texId);
-                    mTexturesByPath[path] = prop.texture.GetIndex();
-
-                    std::string imgId = mAsset->FindUniqueID("", "image");
-                    prop.texture->source = mAsset->images.Create(imgId);
-
-                    if (path[0] == '*') { // embedded
-                        aiTexture* curTex = mScene->mTextures[atoi(&path[1])];
-
-                        prop.texture->source->name = curTex->mFilename.C_Str();
-
-                        uint8_t *data = reinterpret_cast<uint8_t *>(curTex->pcData);
-                        prop.texture->source->SetData(data, curTex->mWidth, *mAsset);
-
-                        if (curTex->achFormatHint[0]) {
-                            std::string mimeType = "image/";
-                            mimeType += (memcmp(curTex->achFormatHint, "jpg", 3) == 0) ? "jpeg" : curTex->achFormatHint;
-                            prop.texture->source->mimeType = mimeType;
-                        }
-                    } else {
-                        prop.texture->source->uri = path;
-                    }
-
-                    GetTexSampler(mat, prop);
-                }
-            }
-        }
-    }
-
-    if (mat->Get(propName, type, idx, col) == AI_SUCCESS) {
-        prop.color[0] = col.r; 
-        prop.color[1] = col.g;
-        prop.color[2] = col.b; 
-        prop.color[3] = col.a;
-    }
-}
-
-
-void glTFExporter::ExportMaterials()
-{
-    aiString aiName;
-    for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) {
-        const aiMaterial* mat = mScene->mMaterials[i];
-
-
-        std::string name;
-        if (mat->Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) {
-            name = aiName.C_Str();
-        }
-        name = mAsset->FindUniqueID(name, "material");
-
-        Ref<Material> m = mAsset->materials.Create(name);
-
-        GetMatColorOrTex(mat, m->ambient, AI_MATKEY_COLOR_AMBIENT, aiTextureType_AMBIENT);
-        GetMatColorOrTex(mat, m->diffuse, AI_MATKEY_COLOR_DIFFUSE, aiTextureType_DIFFUSE);
-        GetMatColorOrTex(mat, m->specular, AI_MATKEY_COLOR_SPECULAR, aiTextureType_SPECULAR);
-        GetMatColorOrTex(mat, m->emission, AI_MATKEY_COLOR_EMISSIVE, aiTextureType_EMISSIVE);
-
-        m->transparent = mat->Get(AI_MATKEY_OPACITY, m->transparency) == aiReturn_SUCCESS && m->transparency != 1.0;
-
-        GetMatScalar(mat, m->shininess, AI_MATKEY_SHININESS);
-    }
-}
-
-/*
- * Search through node hierarchy and find the node containing the given meshID.
- * Returns true on success, and false otherwise.
- */
-bool FindMeshNode(Ref<Node> &nodeIn, Ref<Node> &meshNode, const std::string &meshID) {
-    for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) {
-        if (meshID.compare(nodeIn->meshes[i]->id) == 0) {
-          meshNode = nodeIn;
-          return true;
-        }
-    }
-
-    for (unsigned int i = 0; i < nodeIn->children.size(); ++i) {
-        if(FindMeshNode(nodeIn->children[i], meshNode, meshID)) {
-          return true;
-        }
-    }
-
-    return false;
-}
-
-/*
- * Find the root joint of the skeleton.
- * Starts will any joint node and traces up the tree,
- * until a parent is found that does not have a jointName.
- * Returns the first parent Ref<Node> found that does not have a jointName.
- */
-Ref<Node> FindSkeletonRootJoint(Ref<Skin>& skinRef)
-{
-    Ref<Node> startNodeRef;
-    Ref<Node> parentNodeRef;
-
-    // Arbitrarily use the first joint to start the search.
-    startNodeRef = skinRef->jointNames[0];
-    parentNodeRef = skinRef->jointNames[0];
-
-    do {
-        startNodeRef = parentNodeRef;
-        parentNodeRef = startNodeRef->parent;
-    } while (!parentNodeRef->jointName.empty());
-
-    return parentNodeRef;
-}
-
-void ExportSkin(Asset& mAsset, const aiMesh* aimesh, Ref<Mesh>& meshRef, Ref<Buffer>& bufferRef, Ref<Skin>& skinRef, std::vector<aiMatrix4x4>& inverseBindMatricesData)
-{
-    if (aimesh->mNumBones < 1) {
-        return;
-    }
-
-    // Store the vertex joint and weight data.
-    const size_t NumVerts( aimesh->mNumVertices );
-    vec4* vertexJointData = new vec4[ NumVerts ];
-    vec4* vertexWeightData = new vec4[ NumVerts ];
-    int* jointsPerVertex = new int[ NumVerts ];
-    for (size_t i = 0; i < NumVerts; ++i) {
-        jointsPerVertex[i] = 0;
-        for (size_t j = 0; j < 4; ++j) {
-            vertexJointData[i][j] = 0;
-            vertexWeightData[i][j] = 0;
-        }
-    }
-
-    for (unsigned int idx_bone = 0; idx_bone < aimesh->mNumBones; ++idx_bone) {
-        const aiBone* aib = aimesh->mBones[idx_bone];
-
-        // aib->mName   =====>  skinRef->jointNames
-        // Find the node with id = mName.
-        Ref<Node> nodeRef = mAsset.nodes.Get(aib->mName.C_Str());
-        nodeRef->jointName = nodeRef->id;
-
-        unsigned int jointNamesIndex = 0;
-        bool addJointToJointNames = true;
-        for ( unsigned int idx_joint = 0; idx_joint < skinRef->jointNames.size(); ++idx_joint) {
-            if (skinRef->jointNames[idx_joint]->jointName.compare(nodeRef->jointName) == 0) {
-                addJointToJointNames = false;
-                jointNamesIndex = idx_joint;
-            }
-        }
-
-        if (addJointToJointNames) {
-            skinRef->jointNames.push_back(nodeRef);
-
-            // aib->mOffsetMatrix   =====>  skinRef->inverseBindMatrices
-            aiMatrix4x4 tmpMatrix4;
-            CopyValue(aib->mOffsetMatrix, tmpMatrix4);
-            inverseBindMatricesData.push_back(tmpMatrix4);
-            jointNamesIndex = static_cast<unsigned int>(inverseBindMatricesData.size() - 1);
-        }
-
-        // aib->mWeights   =====>  vertexWeightData
-        for (unsigned int idx_weights = 0; idx_weights < aib->mNumWeights; ++idx_weights) {
-            unsigned int vertexId = aib->mWeights[idx_weights].mVertexId;
-            float vertWeight      = aib->mWeights[idx_weights].mWeight;
-
-            // A vertex can only have at most four joint weights. Ignore all others.
-            if (jointsPerVertex[vertexId] > 3) {
-                continue;
-            }
-
-            vertexJointData[vertexId][jointsPerVertex[vertexId]] = static_cast<float>(jointNamesIndex);
-            vertexWeightData[vertexId][jointsPerVertex[vertexId]] = vertWeight;
-
-            jointsPerVertex[vertexId] += 1;
-        }
-
-    } // End: for-loop mNumMeshes
-
-    Mesh::Primitive& p = meshRef->primitives.back();
-    Ref<Accessor> vertexJointAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices, vertexJointData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-    if ( vertexJointAccessor ) {
-        p.attributes.joint.push_back( vertexJointAccessor );
-    }
-
-    Ref<Accessor> vertexWeightAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices, vertexWeightData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-    if ( vertexWeightAccessor ) {
-        p.attributes.weight.push_back( vertexWeightAccessor );
-    }
-    delete[] jointsPerVertex;
-    delete[] vertexWeightData;
-    delete[] vertexJointData;
-}
-
-#if defined(__has_warning)
-#if __has_warning("-Wunused-but-set-variable")
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
-#endif
-#endif
-
-void glTFExporter::ExportMeshes()
-{
-    // Not for
-    //     using IndicesType = decltype(aiFace::mNumIndices);
-    // But yes for
-    //     using IndicesType = unsigned short;
-    // because "ComponentType_UNSIGNED_SHORT" used for indices. And it's a maximal type according to glTF specification.
-    typedef unsigned short IndicesType;
-
-    // Variables needed for compression. BEGIN.
-    // Indices, not pointers - because pointer to buffer is changing while writing to it.
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-    size_t idx_srcdata_begin = 0; // Index of buffer before writing mesh data. Also, index of begin of coordinates array in buffer.
-    size_t idx_srcdata_normal = SIZE_MAX;// Index of begin of normals array in buffer. SIZE_MAX - mean that mesh has no normals.
-    size_t idx_srcdata_ind;// Index of begin of coordinates indices array in buffer.
-#endif
-    std::vector<size_t> idx_srcdata_tc;// Array of indices. Every index point to begin of texture coordinates array in buffer.
-    bool comp_allow;// Point that data of current mesh can be compressed.
-    // Variables needed for compression. END.
-
-    std::string fname = std::string(mFilename);
-    std::string bufferIdPrefix = fname.substr(0, fname.rfind(".gltf"));
-    std::string bufferId = mAsset->FindUniqueID("", bufferIdPrefix.c_str());
-
-    Ref<Buffer> b = mAsset->GetBodyBuffer();
-    if (!b) {
-       b = mAsset->buffers.Create(bufferId);
-    }
-
-    //----------------------------------------
-    // Initialize variables for the skin
-    bool createSkin = false;
-    for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) {
-        const aiMesh* aim = mScene->mMeshes[idx_mesh];
-        if(aim->HasBones()) {
-            createSkin = true;
-            break;
-        }
-    }
-
-    Ref<Skin> skinRef;
-    std::string skinName = mAsset->FindUniqueID("skin", "skin");
-    std::vector<aiMatrix4x4> inverseBindMatricesData;
-    if(createSkin) {
-        skinRef = mAsset->skins.Create(skinName);
-        skinRef->name = skinName;
-    }
-    //----------------------------------------
-
-	for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) {
-		const aiMesh* aim = mScene->mMeshes[idx_mesh];
-
-		// Check if compressing requested and mesh can be encoded.
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-		comp_allow = mProperties->GetPropertyBool("extensions.Open3DGC.use", false);
-#else
-		comp_allow = false;
-#endif
-
-		if(comp_allow && (aim->mPrimitiveTypes == aiPrimitiveType_TRIANGLE) && (aim->mNumVertices > 0) && (aim->mNumFaces > 0))
-		{
-			idx_srcdata_tc.clear();
-			idx_srcdata_tc.reserve(AI_MAX_NUMBER_OF_TEXTURECOORDS);
-		}
-		else
-		{
-			std::string msg;
-
-			if(aim->mPrimitiveTypes != aiPrimitiveType_TRIANGLE)
-				msg = "all primitives of the mesh must be a triangles.";
-			else
-				msg = "mesh must has vertices and faces.";
-
-            ASSIMP_LOG_WARN("GLTF: can not use Open3DGC-compression: ", msg);
-            comp_allow = false;
-		}
-
-        std::string meshId = mAsset->FindUniqueID(aim->mName.C_Str(), "mesh");
-        Ref<Mesh> m = mAsset->meshes.Create(meshId);
-        m->primitives.resize(1);
-        Mesh::Primitive& p = m->primitives.back();
-
-        p.material = mAsset->materials.Get(aim->mMaterialIndex);
-
-		/******************* Vertices ********************/
-		// If compression is used then you need parameters of uncompressed region: begin and size. At this step "begin" is stored.
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-		if(comp_allow) idx_srcdata_begin = b->byteLength;
-#endif
-
-        Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-		if (v) p.attributes.position.push_back(v);
-
-		/******************** Normals ********************/
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-		if(comp_allow && (aim->mNormals != 0)) idx_srcdata_normal = b->byteLength;// Store index of normals array.
-#endif
-
-		Ref<Accessor> n = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mNormals, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-		if (n) p.attributes.normal.push_back(n);
-
-		/************** Texture coordinates **************/
-        for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-            // Flip UV y coords
-            if (aim -> mNumUVComponents[i] > 1) {
-                for (unsigned int j = 0; j < aim->mNumVertices; ++j) {
-                    aim->mTextureCoords[i][j].y = 1 - aim->mTextureCoords[i][j].y;
-                }
-            }
-
-            if (aim->mNumUVComponents[i] > 0) {
-                AttribType::Value type = (aim->mNumUVComponents[i] == 2) ? AttribType::VEC2 : AttribType::VEC3;
-
-				if(comp_allow) idx_srcdata_tc.push_back(b->byteLength);// Store index of texture coordinates array.
-
-				Ref<Accessor> tc = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mTextureCoords[i], AttribType::VEC3, type, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-				if (tc) p.attributes.texcoord.push_back(tc);
-			}
-		}
-
-		/*************** Vertices indices ****************/
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-		idx_srcdata_ind = b->byteLength;// Store index of indices array.
-#endif
-
-		if (aim->mNumFaces > 0) {
-			std::vector<IndicesType> indices;
-			unsigned int nIndicesPerFace = aim->mFaces[0].mNumIndices;
-            indices.resize(aim->mNumFaces * nIndicesPerFace);
-            for (size_t i = 0; i < aim->mNumFaces; ++i) {
-                for (size_t j = 0; j < nIndicesPerFace; ++j) {
-                    indices[i*nIndicesPerFace + j] = uint16_t(aim->mFaces[i].mIndices[j]);
-                }
-            }
-
-			p.indices = ExportData(*mAsset, meshId, b, unsigned(indices.size()), &indices[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_UNSIGNED_SHORT, BufferViewTarget_ELEMENT_ARRAY_BUFFER);
-		}
-
-        switch (aim->mPrimitiveTypes) {
-            case aiPrimitiveType_POLYGON:
-                p.mode = PrimitiveMode_TRIANGLES; break; // TODO implement this
-            case aiPrimitiveType_LINE:
-                p.mode = PrimitiveMode_LINES; break;
-            case aiPrimitiveType_POINT:
-                p.mode = PrimitiveMode_POINTS; break;
-            default: // aiPrimitiveType_TRIANGLE
-                p.mode = PrimitiveMode_TRIANGLES;
-        }
-
-    /*************** Skins ****************/
-    if(aim->HasBones()) {
-        ExportSkin(*mAsset, aim, m, b, skinRef, inverseBindMatricesData);
-    }
-
-		/****************** Compression ******************/
-		///TODO: animation: weights, joints.
-		if(comp_allow)
-		{
-#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
-			// Only one type of compression supported at now - Open3DGC.
-		//
-			o3dgc::BinaryStream bs;
-			o3dgc::SC3DMCEncoder<IndicesType> encoder;
-			o3dgc::IndexedFaceSet<IndicesType> comp_o3dgc_ifs;
-			o3dgc::SC3DMCEncodeParams comp_o3dgc_params;
-
-			//
-			// Fill data for encoder.
-			//
-			// Quantization
-			unsigned quant_coord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.POSITION", 12);
-			unsigned quant_normal = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.NORMAL", 10);
-			unsigned quant_texcoord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.TEXCOORD", 10);
-
-			// Prediction
-			o3dgc::O3DGCSC3DMCPredictionMode prediction_position = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION;
-			o3dgc::O3DGCSC3DMCPredictionMode prediction_normal =  o3dgc::O3DGC_SC3DMC_SURF_NORMALS_PREDICTION;
-			o3dgc::O3DGCSC3DMCPredictionMode prediction_texcoord = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION;
-
-			// IndexedFacesSet: "Crease angle", "solid", "convex" are set to default.
-			comp_o3dgc_ifs.SetCCW(true);
-			comp_o3dgc_ifs.SetIsTriangularMesh(true);
-			comp_o3dgc_ifs.SetNumFloatAttributes(0);
-			// Coordinates
-			comp_o3dgc_params.SetCoordQuantBits(quant_coord);
-			comp_o3dgc_params.SetCoordPredMode(prediction_position);
-			comp_o3dgc_ifs.SetNCoord(aim->mNumVertices);
-			comp_o3dgc_ifs.SetCoord((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_begin]);
-			// Normals
-			if(idx_srcdata_normal != SIZE_MAX)
-			{
-				comp_o3dgc_params.SetNormalQuantBits(quant_normal);
-				comp_o3dgc_params.SetNormalPredMode(prediction_normal);
-				comp_o3dgc_ifs.SetNNormal(aim->mNumVertices);
-				comp_o3dgc_ifs.SetNormal((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_normal]);
-			}
-
-			// Texture coordinates
-			for(size_t num_tc = 0; num_tc < idx_srcdata_tc.size(); num_tc++)
-			{
-				size_t num = comp_o3dgc_ifs.GetNumFloatAttributes();
-
-				comp_o3dgc_params.SetFloatAttributeQuantBits(static_cast<unsigned long>(num), quant_texcoord);
-				comp_o3dgc_params.SetFloatAttributePredMode(static_cast<unsigned long>(num), prediction_texcoord);
-				comp_o3dgc_ifs.SetNFloatAttribute(static_cast<unsigned long>(num), aim->mNumVertices);// number of elements.
-				comp_o3dgc_ifs.SetFloatAttributeDim(static_cast<unsigned long>(num), aim->mNumUVComponents[num_tc]);// components per element: aiVector3D => x * float
-				comp_o3dgc_ifs.SetFloatAttributeType(static_cast<unsigned long>(num), o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD);
-				comp_o3dgc_ifs.SetFloatAttribute(static_cast<unsigned long>(num), (o3dgc::Real* const)&b->GetPointer()[idx_srcdata_tc[num_tc]]);
-				comp_o3dgc_ifs.SetNumFloatAttributes(static_cast<unsigned long>(num + 1));
-			}
-
-			// Coordinates indices
-			comp_o3dgc_ifs.SetNCoordIndex(aim->mNumFaces);
-			comp_o3dgc_ifs.SetCoordIndex((IndicesType* const)&b->GetPointer()[idx_srcdata_ind]);
-			// Prepare to encoding
-			comp_o3dgc_params.SetNumFloatAttributes(comp_o3dgc_ifs.GetNumFloatAttributes());
-			if(mProperties->GetPropertyBool("extensions.Open3DGC.binary", true))
-				comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_BINARY);
-			else
-				comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_ASCII);
-
-			comp_o3dgc_ifs.ComputeMinMax(o3dgc::O3DGC_SC3DMC_MAX_ALL_DIMS);
-			//
-			// Encoding
-			//
-			encoder.Encode(comp_o3dgc_params, comp_o3dgc_ifs, bs);
-			// Replace data in buffer.
-			b->ReplaceData(idx_srcdata_begin, b->byteLength - idx_srcdata_begin, bs.GetBuffer(), bs.GetSize());
-			//
-			// Add information about extension to mesh.
-			//
-			// Create extension structure.
-			Mesh::SCompression_Open3DGC* ext = new Mesh::SCompression_Open3DGC;
-
-			// Fill it.
-			ext->Buffer = b->id;
-			ext->Offset = idx_srcdata_begin;
-			ext->Count = b->byteLength - idx_srcdata_begin;
-			ext->Binary = mProperties->GetPropertyBool("extensions.Open3DGC.binary");
-			ext->IndicesCount = comp_o3dgc_ifs.GetNCoordIndex() * 3;
-			ext->VerticesCount = comp_o3dgc_ifs.GetNCoord();
-			// And assign to mesh.
-			m->Extension.push_back(ext);
-#endif
-		}// if(comp_allow)
-	}// for (unsigned int i = 0; i < mScene->mNumMeshes; ++i)
-
-    //----------------------------------------
-    // Finish the skin
-    // Create the Accessor for skinRef->inverseBindMatrices
-    if (createSkin) {
-        mat4* invBindMatrixData = new mat4[inverseBindMatricesData.size()];
-        for ( unsigned int idx_joint = 0; idx_joint < inverseBindMatricesData.size(); ++idx_joint) {
-            CopyValue(inverseBindMatricesData[idx_joint], invBindMatrixData[idx_joint]);
-        }
-
-        Ref<Accessor> invBindMatrixAccessor = ExportData(*mAsset, skinName, b, static_cast<unsigned int>(inverseBindMatricesData.size()), invBindMatrixData, AttribType::MAT4, AttribType::MAT4, ComponentType_FLOAT);
-        if (invBindMatrixAccessor) skinRef->inverseBindMatrices = invBindMatrixAccessor;
-
-        // Identity Matrix   =====>  skinRef->bindShapeMatrix
-        // Temporary. Hard-coded identity matrix here
-        skinRef->bindShapeMatrix.isPresent = true;
-        IdentityMatrix4(skinRef->bindShapeMatrix.value);
-
-        // Find node that contains this mesh and add "skeletons" and "skin" attributes to that node.
-        Ref<Node> rootNode = mAsset->nodes.Get(unsigned(0));
-        Ref<Node> meshNode;
-        std::string meshID = mAsset->meshes.Get(unsigned(0))->id;
-        FindMeshNode(rootNode, meshNode, meshID);
-
-        Ref<Node> rootJoint = FindSkeletonRootJoint(skinRef);
-        meshNode->skeletons.push_back(rootJoint);
-        meshNode->skin = skinRef;
-    }
-}
-
-#if defined(__has_warning)
-#if __has_warning("-Wunused-but-set-variable")
-#pragma GCC diagnostic pop
-#endif
-#endif
-
-/*
- * Export the root node of the node hierarchy.
- * Calls ExportNode for all children.
- */
-unsigned int glTFExporter::ExportNodeHierarchy(const aiNode* n)
-{
-    Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
-
-    if (!n->mTransformation.IsIdentity()) {
-        node->matrix.isPresent = true;
-        CopyValue(n->mTransformation, node->matrix.value);
-    }
-
-    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
-        node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i]));
-    }
-
-    for (unsigned int i = 0; i < n->mNumChildren; ++i) {
-        unsigned int idx = ExportNode(n->mChildren[i], node);
-        node->children.push_back(mAsset->nodes.Get(idx));
-    }
-
-    return node.GetIndex();
-}
-
-/*
- * Export node and recursively calls ExportNode for all children.
- * Since these nodes are not the root node, we also export the parent Ref<Node>
- */
-unsigned int glTFExporter::ExportNode(const aiNode* n, Ref<Node>& parent)
-{
-    Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
-
-    node->parent = parent;
-
-    if (!n->mTransformation.IsIdentity()) {
-        node->matrix.isPresent = true;
-        CopyValue(n->mTransformation, node->matrix.value);
-    }
-
-    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
-        node->meshes.push_back(mAsset->meshes.Get(n->mMeshes[i]));
-    }
-
-    for (unsigned int i = 0; i < n->mNumChildren; ++i) {
-        unsigned int idx = ExportNode(n->mChildren[i], node);
-        node->children.push_back(mAsset->nodes.Get(idx));
-    }
-
-    return node.GetIndex();
-}
-
-
-void glTFExporter::ExportScene()
-{
-    const char* sceneName = "defaultScene";
-    Ref<Scene> scene = mAsset->scenes.Create(sceneName);
-
-    // root node will be the first one exported (idx 0)
-    if (mAsset->nodes.Size() > 0) {
-        scene->nodes.push_back(mAsset->nodes.Get(0u));
-    }
-
-    // set as the default scene
-    mAsset->scene = scene;
-}
-
-void glTFExporter::ExportMetadata()
-{
-    glTF::AssetMetadata& asset = mAsset->asset;
-    asset.version = "1.0";
-
-    char buffer[256];
-    ai_snprintf(buffer, 256, "Open Asset Import Library (assimp v%d.%d.%x)",
-        aiGetVersionMajor(), aiGetVersionMinor(), aiGetVersionRevision());
-
-    asset.generator = buffer;
-
-	// Copyright
-	aiString copyright_str;
-	if (mScene->mMetaData != nullptr && mScene->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, copyright_str)) {
-		asset.copyright = copyright_str.C_Str();
-	}
-}
-
-inline void ExtractAnimationData(Asset& mAsset, std::string& animId, Ref<Animation>& animRef, Ref<Buffer>& buffer, const aiNodeAnim* nodeChannel, float ticksPerSecond)
-{
-    // Loop over the data and check to see if it exactly matches an existing buffer.
-    //    If yes, then reference the existing corresponding accessor.
-    //    Otherwise, add to the buffer and create a new accessor.
-
-    size_t counts[3] = {
-        nodeChannel->mNumPositionKeys,
-        nodeChannel->mNumScalingKeys,
-        nodeChannel->mNumRotationKeys,
-    };
-    size_t numKeyframes = 1;
-    for (int i = 0; i < 3; ++i) {
-        if (counts[i] > numKeyframes) {
-            numKeyframes = counts[i];
-        }
-    }
-
-    //-------------------------------------------------------
-    // Extract TIME parameter data.
-    // Check if the timeStamps are the same for mPositionKeys, mRotationKeys, and mScalingKeys.
-    if(nodeChannel->mNumPositionKeys > 0) {
-        typedef float TimeType;
-        std::vector<TimeType> timeData;
-        timeData.resize(numKeyframes);
-        for (size_t i = 0; i < numKeyframes; ++i) {
-            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
-            // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
-            // Check if we have to cast type here. e.g. uint16_t()
-            timeData[i] = static_cast<float>(nodeChannel->mPositionKeys[frameIndex].mTime / ticksPerSecond);
-        }
-
-        Ref<Accessor> timeAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), &timeData[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT);
-        if (timeAccessor) animRef->Parameters.TIME = timeAccessor;
-    }
-
-    //-------------------------------------------------------
-    // Extract translation parameter data
-    if(nodeChannel->mNumPositionKeys > 0) {
-        C_STRUCT aiVector3D* translationData = new aiVector3D[numKeyframes];
-        for (size_t i = 0; i < numKeyframes; ++i) {
-            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
-            translationData[i] = nodeChannel->mPositionKeys[frameIndex].mValue;
-        }
-
-        Ref<Accessor> tranAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), translationData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-        if ( tranAccessor ) {
-            animRef->Parameters.translation = tranAccessor;
-        }
-        delete[] translationData;
-    }
-
-    //-------------------------------------------------------
-    // Extract scale parameter data
-    if(nodeChannel->mNumScalingKeys > 0) {
-        C_STRUCT aiVector3D* scaleData = new aiVector3D[numKeyframes];
-        for (size_t i = 0; i < numKeyframes; ++i) {
-            size_t frameIndex = i * nodeChannel->mNumScalingKeys / numKeyframes;
-            scaleData[i] = nodeChannel->mScalingKeys[frameIndex].mValue;
-        }
-
-        Ref<Accessor> scaleAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), scaleData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-        if ( scaleAccessor ) {
-            animRef->Parameters.scale = scaleAccessor;
-        }
-        delete[] scaleData;
-    }
-
-    //-------------------------------------------------------
-    // Extract rotation parameter data
-    if(nodeChannel->mNumRotationKeys > 0) {
-        vec4* rotationData = new vec4[numKeyframes];
-        for (size_t i = 0; i < numKeyframes; ++i) {
-            size_t frameIndex = i * nodeChannel->mNumRotationKeys / numKeyframes;
-            rotationData[i][0] = nodeChannel->mRotationKeys[frameIndex].mValue.x;
-            rotationData[i][1] = nodeChannel->mRotationKeys[frameIndex].mValue.y;
-            rotationData[i][2] = nodeChannel->mRotationKeys[frameIndex].mValue.z;
-            rotationData[i][3] = nodeChannel->mRotationKeys[frameIndex].mValue.w;
-        }
-
-        Ref<Accessor> rotAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), rotationData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-        if ( rotAccessor ) {
-            animRef->Parameters.rotation = rotAccessor;
-        }
-        delete[] rotationData;
-    }
-}
-
-void glTFExporter::ExportAnimations()
-{
-    Ref<Buffer> bufferRef = mAsset->buffers.Get(unsigned (0));
-
-    for (unsigned int i = 0; i < mScene->mNumAnimations; ++i) {
-        const aiAnimation* anim = mScene->mAnimations[i];
-
-        std::string nameAnim = "anim";
-        if (anim->mName.length > 0) {
-            nameAnim = anim->mName.C_Str();
-        }
-
-        for (unsigned int channelIndex = 0; channelIndex < anim->mNumChannels; ++channelIndex) {
-            const aiNodeAnim* nodeChannel = anim->mChannels[channelIndex];
-
-            // It appears that assimp stores this type of animation as multiple animations.
-            // where each aiNodeAnim in mChannels animates a specific node.
-            std::string name = nameAnim + "_" + ai_to_string(channelIndex);
-            name = mAsset->FindUniqueID(name, "animation");
-            Ref<Animation> animRef = mAsset->animations.Create(name);
-
-            /******************* Parameters ********************/
-            ExtractAnimationData(*mAsset, name, animRef, bufferRef, nodeChannel, static_cast<float>(anim->mTicksPerSecond));
-
-            for (unsigned int j = 0; j < 3; ++j) {
-                std::string channelType;
-                int channelSize=0;
-                switch (j) {
-                    case 0:
-                        channelType = "rotation";
-                        channelSize = nodeChannel->mNumRotationKeys;
-                        break;
-                    case 1:
-                        channelType = "scale";
-                        channelSize = nodeChannel->mNumScalingKeys;
-                        break;
-                    case 2:
-                        channelType = "translation";
-                        channelSize = nodeChannel->mNumPositionKeys;
-                        break;
-                }
-
-                if (channelSize < 1) { continue; }
-
-                Animation::AnimChannel tmpAnimChannel;
-                Animation::AnimSampler tmpAnimSampler;
-
-                tmpAnimChannel.sampler = name + "_" + channelType;
-                tmpAnimChannel.target.path = channelType;
-                tmpAnimSampler.output = channelType;
-                tmpAnimSampler.id = name + "_" + channelType;
-
-                tmpAnimChannel.target.id = mAsset->nodes.Get(nodeChannel->mNodeName.C_Str());
-
-                tmpAnimSampler.input = "TIME";
-                tmpAnimSampler.interpolation = "LINEAR";
-
-                animRef->Channels.push_back(tmpAnimChannel);
-                animRef->Samplers.push_back(tmpAnimSampler);
-            }
-
-        }
-
-        // Assimp documentation staes this is not used (not implemented)
-        // for (unsigned int channelIndex = 0; channelIndex < anim->mNumMeshChannels; ++channelIndex) {
-        //     const aiMeshAnim* meshChannel = anim->mMeshChannels[channelIndex];
-        // }
-
-    } // End: for-loop mNumAnimations
-}
-
-
-#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER
-#endif // ASSIMP_BUILD_NO_EXPORT