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Merge pull request #1363 from jamesgk/gltf2 

glTF2 export support
pull/1370/head
Kim Kulling 2017-07-29 15:08:52 +02:00 committed by GitHub
parent efa0aaf729 5939d81138
commit 44e2ba541f
8 changed files with 4766 additions and 0 deletions
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6
code/CMakeLists.txt
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@ -661,6 +661,12 @@ ADD_ASSIMP_IMPORTER( GLTF
glTFImporter.h
glTFExporter.h
glTFExporter.cpp
glTF2Asset.h
glTF2Asset.inl
glTF2AssetWriter.h
glTF2AssetWriter.inl
glTF2Exporter.h
glTF2Exporter.cpp
)
ADD_ASSIMP_IMPORTER( 3MF

3
code/Exporter.cpp
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@ -90,6 +90,7 @@ void ExportScenePlyBinary(const char*, IOSystem*, const aiScene*, const ExportPr
void ExportScene3DS(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneGLTF(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneGLB(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneGLTF2(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneAssbin(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneAssxml(const char*, IOSystem*, const aiScene*, const ExportProperties*);
void ExportSceneX3D(const char*, IOSystem*, const aiScene*, const ExportProperties*);
@ -144,6 +145,8 @@ Exporter::ExportFormatEntry gExporters[] =
aiProcess_JoinIdenticalVertices | aiProcess_Triangulate | aiProcess_SortByPType),
Exporter::ExportFormatEntry( "glb", "GL Transmission Format (binary)", "glb", &ExportSceneGLB,
aiProcess_JoinIdenticalVertices | aiProcess_Triangulate | aiProcess_SortByPType),
Exporter::ExportFormatEntry( "gltf2", "GL Transmission Format v. 2", "gltf", &ExportSceneGLTF2,
aiProcess_JoinIdenticalVertices | aiProcess_Triangulate | aiProcess_SortByPType),
#endif
#ifndef ASSIMP_BUILD_NO_ASSBIN_EXPORTER

1210
code/glTF2Asset.h 100644
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1637
code/glTF2Asset.inl 100644
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95
code/glTF2AssetWriter.h 100644
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@ -0,0 +1,95 @@
/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
Copyright (c) 2006-2017, 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.
----------------------------------------------------------------------
*/
/** @file glTFWriter.h
* Declares a class to write gltf/glb files
*
* glTF Extensions Support:
* KHR_binary_glTF: full
* KHR_materials_common: full
*/
#ifndef GLTF2ASSETWRITER_H_INC
#define GLTF2ASSETWRITER_H_INC
#ifndef ASSIMP_BUILD_NO_GLTF_IMPORTER
#include "glTF2Asset.h"
namespace glTF2
{
using rapidjson::MemoryPoolAllocator;
class AssetWriter
{
template<class T>
friend void WriteLazyDict(LazyDict<T>& d, AssetWriter& w);
private:
void WriteBinaryData(IOStream* outfile, size_t sceneLength);
void WriteMetadata();
void WriteExtensionsUsed();
template<class T>
void WriteObjects(LazyDict<T>& d);
public:
Document mDoc;
Asset& mAsset;
MemoryPoolAllocator<>& mAl;
AssetWriter(Asset& asset);
void WriteFile(const char* path);
void WriteGLBFile(const char* path);
};
}
// Include the implementation of the methods
#include "glTF2AssetWriter.inl"
#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
#endif // GLTF2ASSETWRITER_H_INC

677
code/glTF2AssetWriter.inl 100644
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@ -0,0 +1,677 @@
/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
Copyright (c) 2006-2017, 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 <rapidjson/stringbuffer.h>
#include <rapidjson/writer.h>
#include <rapidjson/prettywriter.h>
namespace glTF2 {
using rapidjson::StringBuffer;
using rapidjson::PrettyWriter;
using rapidjson::Writer;
using rapidjson::StringRef;
using rapidjson::StringRef;
namespace {
template<size_t N>
inline Value& MakeValue(Value& val, float(&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;
}
inline Value& MakeValue(Value& val, const std::vector<float> & 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<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(v[i]->index, al);
}
obj.AddMember(StringRef(fieldId), lst, al);
}
}
inline void Write(Value& obj, Accessor& a, AssetWriter& w)
{
obj.AddMember("bufferView", a.bufferView->index, 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;
obj.AddMember("max", MakeValue(vTmpMax, a.max, w.mAl), w.mAl);
obj.AddMember("min", MakeValue(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("node", c.target.node->index, 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);
/****************** Samplers *******************/
Value valSamplers;
valSamplers.SetArray();
for (size_t i = 0; i < unsigned(a.Samplers.size()); ++i) {
Animation::AnimSampler& s = a.Samplers[i];
Value valSampler;
valSampler.SetObject();
{
Ref<Accessor> inputAccessor = a.GetAccessor(s.input);
Ref<Accessor> outputAccessor = a.GetAccessor(s.output);
valSampler.AddMember("input", inputAccessor->index, w.mAl);
valSampler.AddMember("interpolation", s.interpolation, w.mAl);
valSampler.AddMember("output", outputAccessor->index, w.mAl);
}
valSamplers.PushBack(valSampler, w.mAl);
}
obj.AddMember("samplers", valSamplers, w.mAl);
}
inline void Write(Value& obj, Buffer& b, AssetWriter& w)
{
obj.AddMember("byteLength", static_cast<uint64_t>(b.byteLength), 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", bv.buffer->index, w.mAl);
obj.AddMember("byteOffset", static_cast<uint64_t>(bv.byteOffset), w.mAl);
obj.AddMember("byteLength", static_cast<uint64_t>(bv.byteLength), w.mAl);
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", img.bufferView->index, 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,";
Util::EncodeBase64(img.GetData(), img.GetDataLength(), uri);
}
else {
uri = img.uri;
}
obj.AddMember("uri", Value(uri, w.mAl).Move(), w.mAl);
}
namespace {
inline void WriteTex(Value& obj, Ref<Texture> texture, const char* propName, MemoryPoolAllocator<>& al)
{
if (texture) {
Value tex;
tex.SetObject();
tex.AddMember("index", texture->index, al);
obj.AddMember(StringRef(propName), tex, al);
}
}
inline void WriteColorOrTex(Value& obj, TexProperty& prop, const char* propName, MemoryPoolAllocator<>& al)
{
WriteTex(obj, prop.texture, propName, al);
if (!prop.texture) {
Value col;
obj.AddMember(StringRef(propName), MakeValue(col, prop.color, al), al);
}
}
}
inline void Write(Value& obj, Material& m, AssetWriter& w)
{
if (m.transparent) {
obj.AddMember("alphaMode", "BLEND", w.mAl);
}
Value v;
v.SetObject();
{
if (m.transparent && !m.diffuse.texture) {
m.diffuse.color[3] = m.transparency;
}
WriteColorOrTex(v, m.ambient, m.ambient.texture ? "ambientTexture" : "ambientFactor", w.mAl);
WriteColorOrTex(v, m.diffuse, m.diffuse.texture ? "diffuseTexture" : "diffuseFactor", w.mAl);
WriteColorOrTex(v, m.specular, m.specular.texture ? "specularTexture" : "specularFactor", w.mAl);
WriteColorOrTex(v, m.emission, m.emission.texture ? "emissionTexture" : "emissionFactor", w.mAl);
v.AddMember("shininessFactor", m.shininess, w.mAl);
}
v.AddMember("type", "commonPhong", w.mAl);
Value ext;
ext.SetObject();
ext.AddMember("KHR_materials_common", v, w.mAl);
obj.AddMember("extensions", ext, w.mAl);
WriteTex(obj, m.normal, "normalTexture", 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), lst[0]->index, 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(), lst[i]->index, 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();
for(Mesh::SExtension* ptr_ext : m.Extension)
{
switch(ptr_ext->Type)
{
#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
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", 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", 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", ptr_ext_comp->IndicesCount, w.mAl);
json_comp_data.AddMember("verticesCount", 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;
#endif
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)
// 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->index, w.mAl);
if (p.indices)
prim.AddMember("indices", p.indices->index, 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", n.skin->index, 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(b.jointNames[i]->index, w.mAl);
}
obj.AddMember("joints", 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", b.inverseBindMatrices->index, 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", tex.source->index, w.mAl);
}
if (tex.sampler) {
obj.AddMember("sampler", tex.sampler->index, 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", mAsset.scene->index, 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);
mDoc.Accept(writer);
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);
mDoc.Accept(writer);
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 = 2;
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();
{
char versionChar[10];
ai_snprintf(versionChar, sizeof(versionChar), "%d", mAsset.asset.version);
asset.AddMember("version", Value(versionChar, mAl).Move(), mAl);
asset.AddMember("generator", Value(mAsset.asset.generator, 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);
// This is used to export common materials with GLTF 2.
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 = FindArray(*container, d.mDictId))) {
container->AddMember(StringRef(d.mDictId), Value().SetArray().Move(), mDoc.GetAllocator());
dict = FindArray(*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->PushBack(obj, mAl);
}
}
template<class T>
void WriteLazyDict(LazyDict<T>& d, AssetWriter& w)
{
w.WriteObjects(d);
}
}

1018
code/glTF2Exporter.cpp 100644
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code/glTF2Exporter.h 100644
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@ -0,0 +1,120 @@
/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
Copyright (c) 2006-2017, 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.
----------------------------------------------------------------------
*/
/** @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
#ifndef ASSIMP_BUILD_NO_GLTF_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 Node;
struct Texture;
}
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);
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;
void WriteBinaryData(IOStream* outfile, std::size_t sceneLength);
void GetTexSampler(const aiMaterial* mat, glTF2::Ref<glTF2::Texture> texture);
void GetMatTex(const aiMaterial* mat, glTF2::Ref<glTF2::Texture>& texture, aiTextureType tt);
void GetMatColorOrTex(const aiMaterial* mat, glTF2::TexProperty& prop, const char* propName, int type, int idx, aiTextureType tt);
void ExportMetadata();
void ExportMaterials();
void ExportMeshes();
unsigned int ExportNodeHierarchy(const aiNode* n);
unsigned int ExportNode(const aiNode* node, glTF2::Ref<glTF2::Node>& parent);
void ExportScene();
void ExportAnimations();
};
}
#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
#endif // AI_GLTF2EXPORTER_H_INC