add assimp submodule

1 files changed, 716 insertions, 0 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/glTF/glTFAssetWriter.inl b/src/mesh/assimp-master/code/AssetLib/glTF/glTFAssetWriter.inl
new file mode 100644
index 0000000..a1265fb
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/glTF/glTFAssetWriter.inl
@@ -0,0 +1,716 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+#include <assimp/Base64.hpp>
+
+#include <rapidjson/stringbuffer.h>
+#include <rapidjson/writer.h>
+#include <rapidjson/prettywriter.h>
+
+#if _MSC_VER
+#    pragma warning(push)
+#    pragma warning( disable : 4706)
+#endif // _MSC_VER
+
+namespace glTF {
+
+    using rapidjson::StringBuffer;
+    using rapidjson::PrettyWriter;
+    using rapidjson::Writer;
+    using rapidjson::StringRef;
+    using rapidjson::StringRef;
+
+    namespace {
+
+        template<typename T, size_t N>
+        inline
+        Value& MakeValue(Value& val, T(&r)[N], MemoryPoolAllocator<>& al) {
+            val.SetArray();
+            val.Reserve(N, al);
+            for (decltype(N) i = 0; i < N; ++i) {
+                val.PushBack(r[i], al);
+            }
+            return val;
+        }
+
+        template<typename T>
+        inline
+        Value& MakeValue(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
+            val.SetArray();
+            val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
+            for (unsigned int i = 0; i < r.size(); ++i) {
+                val.PushBack(r[i], al);
+            }
+            return val;
+        }
+
+        template<typename C, typename T>
+        inline Value& MakeValueCast(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
+            val.SetArray();
+            val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
+            for (unsigned int i = 0; i < r.size(); ++i) {
+                val.PushBack(static_cast<C>(r[i]), al);
+            }
+            return val;
+        }
+
+        template<class T>
+        inline void AddRefsVector(Value& obj, const char* fieldId, std::vector< Ref<T> >& v, MemoryPoolAllocator<>& al) {
+            if (v.empty()) return;
+            Value lst;
+            lst.SetArray();
+            lst.Reserve(unsigned(v.size()), al);
+            for (size_t i = 0; i < v.size(); ++i) {
+                lst.PushBack(StringRef(v[i]->id), al);
+            }
+            obj.AddMember(StringRef(fieldId), lst, al);
+        }
+
+
+    }
+
+    inline void Write(Value& obj, Accessor& a, AssetWriter& w)
+    {
+        obj.AddMember("bufferView", Value(a.bufferView->id, w.mAl).Move(), w.mAl);
+        obj.AddMember("byteOffset", a.byteOffset, w.mAl);
+        obj.AddMember("byteStride", a.byteStride, w.mAl);
+        obj.AddMember("componentType", int(a.componentType), w.mAl);
+        obj.AddMember("count", a.count, w.mAl);
+        obj.AddMember("type", StringRef(AttribType::ToString(a.type)), w.mAl);
+
+        Value vTmpMax, vTmpMin;
+		if (a.componentType == ComponentType_FLOAT) {
+			obj.AddMember("max", MakeValue(vTmpMax, a.max, w.mAl), w.mAl);
+			obj.AddMember("min", MakeValue(vTmpMin, a.min, w.mAl), w.mAl);
+		} else {
+			obj.AddMember("max", MakeValueCast<int64_t>(vTmpMax, a.max, w.mAl), w.mAl);
+			obj.AddMember("min", MakeValueCast<int64_t>(vTmpMin, a.min, w.mAl), w.mAl);
+		}
+    }
+
+    inline void Write(Value& obj, Animation& a, AssetWriter& w)
+    {
+        /****************** Channels *******************/
+        Value channels;
+        channels.SetArray();
+        channels.Reserve(unsigned(a.Channels.size()), w.mAl);
+
+        for (size_t i = 0; i < unsigned(a.Channels.size()); ++i) {
+            Animation::AnimChannel& c = a.Channels[i];
+            Value valChannel;
+            valChannel.SetObject();
+            {
+                valChannel.AddMember("sampler", c.sampler, w.mAl);
+
+                Value valTarget;
+                valTarget.SetObject();
+                {
+                    valTarget.AddMember("id", StringRef(c.target.id->id), w.mAl);
+                    valTarget.AddMember("path", c.target.path, w.mAl);
+                }
+                valChannel.AddMember("target", valTarget, w.mAl);
+            }
+            channels.PushBack(valChannel, w.mAl);
+        }
+        obj.AddMember("channels", channels, w.mAl);
+
+        /****************** Parameters *******************/
+        Value valParameters;
+        valParameters.SetObject();
+        {
+            if (a.Parameters.TIME) {
+                valParameters.AddMember("TIME", StringRef(a.Parameters.TIME->id), w.mAl);
+            }
+            if (a.Parameters.rotation) {
+                valParameters.AddMember("rotation", StringRef(a.Parameters.rotation->id), w.mAl);
+            }
+            if (a.Parameters.scale) {
+                valParameters.AddMember("scale", StringRef(a.Parameters.scale->id), w.mAl);
+            }
+            if (a.Parameters.translation) {
+                valParameters.AddMember("translation", StringRef(a.Parameters.translation->id), w.mAl);
+            }
+        }
+        obj.AddMember("parameters", valParameters, w.mAl);
+
+        /****************** Samplers *******************/
+        Value valSamplers;
+        valSamplers.SetObject();
+
+        for (size_t i = 0; i < unsigned(a.Samplers.size()); ++i) {
+            Animation::AnimSampler& s = a.Samplers[i];
+            Value valSampler;
+            valSampler.SetObject();
+            {
+                valSampler.AddMember("input", s.input, w.mAl);
+                valSampler.AddMember("interpolation", s.interpolation, w.mAl);
+                valSampler.AddMember("output", s.output, w.mAl);
+            }
+            valSamplers.AddMember(StringRef(s.id), valSampler, w.mAl);
+        }
+        obj.AddMember("samplers", valSamplers, w.mAl);
+    }
+
+    inline void Write(Value& obj, Buffer& b, AssetWriter& w)
+    {
+        const char* type;
+        switch (b.type) {
+            case Buffer::Type_text:
+                type = "text"; break;
+            default:
+                type = "arraybuffer";
+        }
+
+        obj.AddMember("byteLength", static_cast<uint64_t>(b.byteLength), w.mAl);
+        obj.AddMember("type", StringRef(type), w.mAl);
+        obj.AddMember("uri", Value(b.GetURI(), w.mAl).Move(), w.mAl);
+    }
+
+    inline void Write(Value& obj, BufferView& bv, AssetWriter& w)
+    {
+        obj.AddMember("buffer", Value(bv.buffer->id, w.mAl).Move(), w.mAl);
+        obj.AddMember("byteOffset", static_cast<uint64_t>(bv.byteOffset), w.mAl);
+        obj.AddMember("byteLength", static_cast<uint64_t>(bv.byteLength), w.mAl);
+        if (bv.target != BufferViewTarget_NONE) {
+            obj.AddMember("target", int(bv.target), w.mAl);
+        }
+    }
+
+    inline void Write(Value& /*obj*/, Camera& /*c*/, AssetWriter& /*w*/)
+    {
+
+    }
+
+    inline void Write(Value& obj, Image& img, AssetWriter& w)
+    {
+        std::string uri;
+        if (w.mAsset.extensionsUsed.KHR_binary_glTF && img.bufferView) {
+            Value exts, ext;
+            exts.SetObject();
+            ext.SetObject();
+
+            ext.AddMember("bufferView", StringRef(img.bufferView->id), w.mAl);
+
+            if (!img.mimeType.empty())
+                ext.AddMember("mimeType", StringRef(img.mimeType), w.mAl);
+
+            exts.AddMember("KHR_binary_glTF", ext, w.mAl);
+            obj.AddMember("extensions", exts, w.mAl);
+            return;
+        }
+        else if (img.HasData()) {
+            uri = "data:" + (img.mimeType.empty() ? "application/octet-stream" : img.mimeType);
+            uri += ";base64,";
+            Base64::Encode(img.GetData(), img.GetDataLength(), uri);
+        }
+        else {
+            uri = img.uri;
+        }
+
+        obj.AddMember("uri", Value(uri, w.mAl).Move(), w.mAl);
+    }
+
+    namespace {
+        inline void WriteColorOrTex(Value& obj, TexProperty& prop, const char* propName, MemoryPoolAllocator<>& al)
+        {
+            if (prop.texture)
+                obj.AddMember(StringRef(propName), Value(prop.texture->id, al).Move(), al);
+            else {
+                Value col;
+                obj.AddMember(StringRef(propName), MakeValue(col, prop.color, al), al);
+            }
+        }
+    }
+
+    inline void Write(Value& obj, Material& m, AssetWriter& w)
+    {
+        Value v;
+        v.SetObject();
+        {
+            WriteColorOrTex(v, m.ambient, "ambient", w.mAl);
+            WriteColorOrTex(v, m.diffuse, "diffuse", w.mAl);
+            WriteColorOrTex(v, m.specular, "specular", w.mAl);
+            WriteColorOrTex(v, m.emission, "emission", w.mAl);
+
+            if (m.transparent)
+                v.AddMember("transparency", m.transparency, w.mAl);
+
+            v.AddMember("shininess", m.shininess, w.mAl);
+        }
+        obj.AddMember("values", v, w.mAl);
+    }
+
+    namespace {
+        inline void WriteAttrs(AssetWriter& w, Value& attrs, Mesh::AccessorList& lst,
+            const char* semantic, bool forceNumber = false)
+        {
+            if (lst.empty()) return;
+            if (lst.size() == 1 && !forceNumber) {
+                attrs.AddMember(StringRef(semantic), Value(lst[0]->id, w.mAl).Move(), w.mAl);
+            }
+            else {
+                for (size_t i = 0; i < lst.size(); ++i) {
+                    char buffer[32];
+                    ai_snprintf(buffer, 32, "%s_%d", semantic, int(i));
+                    attrs.AddMember(Value(buffer, w.mAl).Move(), Value(lst[i]->id, w.mAl).Move(), w.mAl);
+                }
+            }
+        }
+    }
+
+    inline void Write(Value& obj, Mesh& m, AssetWriter& w)
+    {
+		/********************* Name **********************/
+		obj.AddMember("name", m.name, w.mAl);
+
+		/**************** Mesh extensions ****************/
+		if(m.Extension.size() > 0)
+		{
+			Value json_extensions;
+
+			json_extensions.SetObject();
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+			for(Mesh::SExtension* ptr_ext : m.Extension)
+			{
+				switch(ptr_ext->Type)
+				{
+					case Mesh::SExtension::EType::Compression_Open3DGC:
+						{
+							Value json_comp_data;
+							Mesh::SCompression_Open3DGC* ptr_ext_comp = (Mesh::SCompression_Open3DGC*)ptr_ext;
+
+							// filling object "compressedData"
+							json_comp_data.SetObject();
+							json_comp_data.AddMember("buffer", ptr_ext_comp->Buffer, w.mAl);
+							json_comp_data.AddMember("byteOffset", static_cast<uint64_t>(ptr_ext_comp->Offset), w.mAl);
+							json_comp_data.AddMember("componentType", 5121, w.mAl);
+							json_comp_data.AddMember("type", "SCALAR", w.mAl);
+							json_comp_data.AddMember("count", static_cast<uint64_t>(ptr_ext_comp->Count), w.mAl);
+							if(ptr_ext_comp->Binary)
+								json_comp_data.AddMember("mode", "binary", w.mAl);
+							else
+								json_comp_data.AddMember("mode", "ascii", w.mAl);
+
+							json_comp_data.AddMember("indicesCount", static_cast<uint64_t>(ptr_ext_comp->IndicesCount), w.mAl);
+							json_comp_data.AddMember("verticesCount", static_cast<uint64_t>(ptr_ext_comp->VerticesCount), w.mAl);
+							// filling object "Open3DGC-compression"
+							Value json_o3dgc;
+
+							json_o3dgc.SetObject();
+							json_o3dgc.AddMember("compressedData", json_comp_data, w.mAl);
+							// add member to object "extensions"
+							json_extensions.AddMember("Open3DGC-compression", json_o3dgc, w.mAl);
+						}
+
+						break;
+					default:
+						throw DeadlyImportError("GLTF: Can not write mesh: unknown mesh extension, only Open3DGC is supported.");
+				}// switch(ptr_ext->Type)
+			}// for(Mesh::SExtension* ptr_ext : m.Extension)
+#endif
+
+			// Add extensions to mesh
+			obj.AddMember("extensions", json_extensions, w.mAl);
+		}// if(m.Extension.size() > 0)
+
+		/****************** Primitives *******************/
+        Value primitives;
+        primitives.SetArray();
+        primitives.Reserve(unsigned(m.primitives.size()), w.mAl);
+
+        for (size_t i = 0; i < m.primitives.size(); ++i) {
+            Mesh::Primitive& p = m.primitives[i];
+            Value prim;
+            prim.SetObject();
+            {
+                prim.AddMember("mode", Value(int(p.mode)).Move(), w.mAl);
+
+                if (p.material)
+                    prim.AddMember("material", p.material->id, w.mAl);
+
+                if (p.indices)
+                    prim.AddMember("indices", Value(p.indices->id, w.mAl).Move(), w.mAl);
+
+                Value attrs;
+                attrs.SetObject();
+                {
+                    WriteAttrs(w, attrs, p.attributes.position, "POSITION");
+                    WriteAttrs(w, attrs, p.attributes.normal, "NORMAL");
+                    WriteAttrs(w, attrs, p.attributes.texcoord, "TEXCOORD", true);
+                    WriteAttrs(w, attrs, p.attributes.color, "COLOR");
+                    WriteAttrs(w, attrs, p.attributes.joint, "JOINT");
+                    WriteAttrs(w, attrs, p.attributes.jointmatrix, "JOINTMATRIX");
+                    WriteAttrs(w, attrs, p.attributes.weight, "WEIGHT");
+                }
+                prim.AddMember("attributes", attrs, w.mAl);
+            }
+            primitives.PushBack(prim, w.mAl);
+        }
+
+        obj.AddMember("primitives", primitives, w.mAl);
+    }
+
+    inline void Write(Value& obj, Node& n, AssetWriter& w)
+    {
+
+        if (n.matrix.isPresent) {
+            Value val;
+            obj.AddMember("matrix", MakeValue(val, n.matrix.value, w.mAl).Move(), w.mAl);
+        }
+
+        if (n.translation.isPresent) {
+            Value val;
+            obj.AddMember("translation", MakeValue(val, n.translation.value, w.mAl).Move(), w.mAl);
+        }
+
+        if (n.scale.isPresent) {
+            Value val;
+            obj.AddMember("scale", MakeValue(val, n.scale.value, w.mAl).Move(), w.mAl);
+        }
+        if (n.rotation.isPresent) {
+            Value val;
+            obj.AddMember("rotation", MakeValue(val, n.rotation.value, w.mAl).Move(), w.mAl);
+        }
+
+        AddRefsVector(obj, "children", n.children, w.mAl);
+
+        AddRefsVector(obj, "meshes", n.meshes, w.mAl);
+
+        AddRefsVector(obj, "skeletons", n.skeletons, w.mAl);
+
+        if (n.skin) {
+            obj.AddMember("skin", Value(n.skin->id, w.mAl).Move(), w.mAl);
+        }
+
+        if (!n.jointName.empty()) {
+          obj.AddMember("jointName", n.jointName, w.mAl);
+        }
+    }
+
+    inline void Write(Value& /*obj*/, Program& /*b*/, AssetWriter& /*w*/)
+    {
+
+    }
+
+    inline void Write(Value& obj, Sampler& b, AssetWriter& w)
+    {
+        if (b.wrapS) {
+            obj.AddMember("wrapS", b.wrapS, w.mAl);
+        }
+        if (b.wrapT) {
+            obj.AddMember("wrapT", b.wrapT, w.mAl);
+        }
+        if (b.magFilter) {
+            obj.AddMember("magFilter", b.magFilter, w.mAl);
+        }
+        if (b.minFilter) {
+            obj.AddMember("minFilter", b.minFilter, w.mAl);
+        }
+    }
+
+    inline void Write(Value& scene, Scene& s, AssetWriter& w)
+    {
+        AddRefsVector(scene, "nodes", s.nodes, w.mAl);
+    }
+
+    inline void Write(Value& /*obj*/, Shader& /*b*/, AssetWriter& /*w*/)
+    {
+
+    }
+
+    inline void Write(Value& obj, Skin& b, AssetWriter& w)
+    {
+        /****************** jointNames *******************/
+        Value vJointNames;
+        vJointNames.SetArray();
+        vJointNames.Reserve(unsigned(b.jointNames.size()), w.mAl);
+
+        for (size_t i = 0; i < unsigned(b.jointNames.size()); ++i) {
+            vJointNames.PushBack(StringRef(b.jointNames[i]->jointName), w.mAl);
+        }
+        obj.AddMember("jointNames", vJointNames, w.mAl);
+
+        if (b.bindShapeMatrix.isPresent) {
+            Value val;
+            obj.AddMember("bindShapeMatrix", MakeValue(val, b.bindShapeMatrix.value, w.mAl).Move(), w.mAl);
+        }
+
+        if (b.inverseBindMatrices) {
+            obj.AddMember("inverseBindMatrices", Value(b.inverseBindMatrices->id, w.mAl).Move(), w.mAl);
+        }
+
+    }
+
+    inline void Write(Value& /*obj*/, Technique& /*b*/, AssetWriter& /*w*/)
+    {
+
+    }
+
+    inline void Write(Value& obj, Texture& tex, AssetWriter& w)
+    {
+        if (tex.source) {
+            obj.AddMember("source", Value(tex.source->id, w.mAl).Move(), w.mAl);
+        }
+        if (tex.sampler) {
+            obj.AddMember("sampler", Value(tex.sampler->id, w.mAl).Move(), w.mAl);
+        }
+    }
+
+    inline void Write(Value& /*obj*/, Light& /*b*/, AssetWriter& /*w*/)
+    {
+
+    }
+
+
+    inline AssetWriter::AssetWriter(Asset& a)
+        : mDoc()
+        , mAsset(a)
+        , mAl(mDoc.GetAllocator())
+    {
+        mDoc.SetObject();
+
+        WriteMetadata();
+        WriteExtensionsUsed();
+
+        // Dump the contents of the dictionaries
+        for (size_t i = 0; i < a.mDicts.size(); ++i) {
+            a.mDicts[i]->WriteObjects(*this);
+        }
+
+        // Add the target scene field
+        if (mAsset.scene) {
+            mDoc.AddMember("scene", StringRef(mAsset.scene->id), mAl);
+        }
+    }
+
+    inline void AssetWriter::WriteFile(const char* path)
+    {
+        std::unique_ptr<IOStream> jsonOutFile(mAsset.OpenFile(path, "wt", true));
+
+        if (jsonOutFile == 0) {
+            throw DeadlyExportError("Could not open output file: " + std::string(path));
+        }
+
+        StringBuffer docBuffer;
+
+        PrettyWriter<StringBuffer> writer(docBuffer);
+        if (!mDoc.Accept(writer)) {
+            throw DeadlyExportError("Failed to write scene data!");
+        }
+
+        if (jsonOutFile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
+            throw DeadlyExportError("Failed to write scene data!");
+        }
+
+        // Write buffer data to separate .bin files
+        for (unsigned int i = 0; i < mAsset.buffers.Size(); ++i) {
+            Ref<Buffer> b = mAsset.buffers.Get(i);
+
+            std::string binPath = b->GetURI();
+
+            std::unique_ptr<IOStream> binOutFile(mAsset.OpenFile(binPath, "wb", true));
+
+            if (binOutFile == 0) {
+                throw DeadlyExportError("Could not open output file: " + binPath);
+            }
+
+            if (b->byteLength > 0) {
+                if (binOutFile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
+                    throw DeadlyExportError("Failed to write binary file: " + binPath);
+                }
+            }
+        }
+    }
+
+    inline void AssetWriter::WriteGLBFile(const char* path)
+    {
+        std::unique_ptr<IOStream> outfile(mAsset.OpenFile(path, "wb", true));
+
+        if (outfile == 0) {
+            throw DeadlyExportError("Could not open output file: " + std::string(path));
+        }
+
+        // we will write the header later, skip its size
+        outfile->Seek(sizeof(GLB_Header), aiOrigin_SET);
+
+        StringBuffer docBuffer;
+        Writer<StringBuffer> writer(docBuffer);
+        if (!mDoc.Accept(writer)) {
+            throw DeadlyExportError("Failed to write scene data!");
+        }
+
+        if (outfile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
+            throw DeadlyExportError("Failed to write scene data!");
+        }
+
+        WriteBinaryData(outfile.get(), docBuffer.GetSize());
+    }
+
+    inline void AssetWriter::WriteBinaryData(IOStream* outfile, size_t sceneLength)
+    {
+        //
+        // write the body data
+        //
+
+        size_t bodyLength = 0;
+        if (Ref<Buffer> b = mAsset.GetBodyBuffer()) {
+            bodyLength = b->byteLength;
+
+            if (bodyLength > 0) {
+                size_t bodyOffset = sizeof(GLB_Header) + sceneLength;
+                bodyOffset = (bodyOffset + 3) & ~3; // Round up to next multiple of 4
+
+                outfile->Seek(bodyOffset, aiOrigin_SET);
+
+                if (outfile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
+                    throw DeadlyExportError("Failed to write body data!");
+                }
+            }
+        }
+
+        //
+        // write the header
+        //
+
+        GLB_Header header;
+        memcpy(header.magic, AI_GLB_MAGIC_NUMBER, sizeof(header.magic));
+
+        header.version = 1;
+        AI_SWAP4(header.version);
+
+        header.length = uint32_t(sizeof(header) + sceneLength + bodyLength);
+        AI_SWAP4(header.length);
+
+        header.sceneLength = uint32_t(sceneLength);
+        AI_SWAP4(header.sceneLength);
+
+        header.sceneFormat = SceneFormat_JSON;
+        AI_SWAP4(header.sceneFormat);
+
+        outfile->Seek(0, aiOrigin_SET);
+
+        if (outfile->Write(&header, 1, sizeof(header)) != sizeof(header)) {
+            throw DeadlyExportError("Failed to write the header!");
+        }
+    }
+
+
+    inline void AssetWriter::WriteMetadata()
+    {
+        Value asset;
+        asset.SetObject();
+        asset.AddMember("version", Value(mAsset.asset.version, mAl).Move(), mAl);
+        asset.AddMember("generator", Value(mAsset.asset.generator, mAl).Move(), mAl);
+        if (!mAsset.asset.copyright.empty())
+            asset.AddMember("copyright", Value(mAsset.asset.copyright, mAl).Move(), mAl);
+
+        mDoc.AddMember("asset", asset, mAl);
+    }
+
+    inline void AssetWriter::WriteExtensionsUsed()
+    {
+        Value exts;
+        exts.SetArray();
+        {
+            if (false)
+                exts.PushBack(StringRef("KHR_binary_glTF"), mAl);
+
+            if (false)
+                exts.PushBack(StringRef("KHR_materials_common"), mAl);
+        }
+
+        if (!exts.Empty())
+            mDoc.AddMember("extensionsUsed", exts, mAl);
+    }
+
+    template<class T>
+    void AssetWriter::WriteObjects(LazyDict<T>& d)
+    {
+        if (d.mObjs.empty()) return;
+
+        Value* container = &mDoc;
+
+        if (d.mExtId) {
+            Value* exts = FindObject(mDoc, "extensions");
+            if (!exts) {
+                mDoc.AddMember("extensions", Value().SetObject().Move(), mDoc.GetAllocator());
+                exts = FindObject(mDoc, "extensions");
+            }
+
+            if (!(container = FindObject(*exts, d.mExtId))) {
+                exts->AddMember(StringRef(d.mExtId), Value().SetObject().Move(), mDoc.GetAllocator());
+                container = FindObject(*exts, d.mExtId);
+            }
+        }
+
+        Value* dict;
+        if (!(dict = FindObject(*container, d.mDictId))) {
+            container->AddMember(StringRef(d.mDictId), Value().SetObject().Move(), mDoc.GetAllocator());
+            dict = FindObject(*container, d.mDictId);
+        }
+
+        for (size_t i = 0; i < d.mObjs.size(); ++i) {
+            if (d.mObjs[i]->IsSpecial()) continue;
+
+            Value obj;
+            obj.SetObject();
+
+            if (!d.mObjs[i]->name.empty()) {
+                obj.AddMember("name", StringRef(d.mObjs[i]->name.c_str()), mAl);
+            }
+
+            Write(obj, *d.mObjs[i], *this);
+
+            dict->AddMember(StringRef(d.mObjs[i]->id), obj, mAl);
+        }
+    }
+
+    template<class T>
+    void WriteLazyDict(LazyDict<T>& d, AssetWriter& w)
+    {
+        w.WriteObjects(d);
+    }
+
+#if _MSC_VER
+#    pragma warning(pop)
+#endif // _WIN32
+
+}