glTFAssetWriter.inl 23 KB

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  1. /*
  2. Open Asset Import Library (assimp)
  3. ----------------------------------------------------------------------
  4. Copyright (c) 2006-2022, assimp team
  5. All rights reserved.
  6. Redistribution and use of this software in source and binary forms,
  7. with or without modification, are permitted provided that the
  8. following conditions are met:
  9. * Redistributions of source code must retain the above
  10. copyright notice, this list of conditions and the
  11. following disclaimer.
  12. * Redistributions in binary form must reproduce the above
  13. copyright notice, this list of conditions and the
  14. following disclaimer in the documentation and/or other
  15. materials provided with the distribution.
  16. * Neither the name of the assimp team, nor the names of its
  17. contributors may be used to endorse or promote products
  18. derived from this software without specific prior
  19. written permission of the assimp team.
  20. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21. "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22. LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23. A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24. OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25. SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26. LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27. DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28. THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29. (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30. OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31. ----------------------------------------------------------------------
  32. */
  33. #include <assimp/Base64.hpp>
  34. #include <rapidjson/stringbuffer.h>
  35. #include <rapidjson/writer.h>
  36. #include <rapidjson/prettywriter.h>
  37. #if _MSC_VER
  38. # pragma warning(push)
  39. # pragma warning( disable : 4706)
  40. #endif // _MSC_VER
  41. namespace glTF {
  42. using rapidjson::StringBuffer;
  43. using rapidjson::PrettyWriter;
  44. using rapidjson::Writer;
  45. using rapidjson::StringRef;
  46. using rapidjson::StringRef;
  47. namespace {
  48. template<typename T, size_t N>
  49. inline
  50. Value& MakeValue(Value& val, T(&r)[N], MemoryPoolAllocator<>& al) {
  51. val.SetArray();
  52. val.Reserve(N, al);
  53. for (decltype(N) i = 0; i < N; ++i) {
  54. val.PushBack(r[i], al);
  55. }
  56. return val;
  57. }
  58. template<typename T>
  59. inline
  60. Value& MakeValue(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
  61. val.SetArray();
  62. val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
  63. for (unsigned int i = 0; i < r.size(); ++i) {
  64. val.PushBack(r[i], al);
  65. }
  66. return val;
  67. }
  68. template<typename C, typename T>
  69. inline Value& MakeValueCast(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
  70. val.SetArray();
  71. val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
  72. for (unsigned int i = 0; i < r.size(); ++i) {
  73. val.PushBack(static_cast<C>(r[i]), al);
  74. }
  75. return val;
  76. }
  77. template<class T>
  78. inline void AddRefsVector(Value& obj, const char* fieldId, std::vector< Ref<T> >& v, MemoryPoolAllocator<>& al) {
  79. if (v.empty()) return;
  80. Value lst;
  81. lst.SetArray();
  82. lst.Reserve(unsigned(v.size()), al);
  83. for (size_t i = 0; i < v.size(); ++i) {
  84. lst.PushBack(StringRef(v[i]->id), al);
  85. }
  86. obj.AddMember(StringRef(fieldId), lst, al);
  87. }
  88. }
  89. inline void Write(Value& obj, Accessor& a, AssetWriter& w)
  90. {
  91. obj.AddMember("bufferView", Value(a.bufferView->id, w.mAl).Move(), w.mAl);
  92. obj.AddMember("byteOffset", a.byteOffset, w.mAl);
  93. obj.AddMember("byteStride", a.byteStride, w.mAl);
  94. obj.AddMember("componentType", int(a.componentType), w.mAl);
  95. obj.AddMember("count", a.count, w.mAl);
  96. obj.AddMember("type", StringRef(AttribType::ToString(a.type)), w.mAl);
  97. Value vTmpMax, vTmpMin;
  98. if (a.componentType == ComponentType_FLOAT) {
  99. obj.AddMember("max", MakeValue(vTmpMax, a.max, w.mAl), w.mAl);
  100. obj.AddMember("min", MakeValue(vTmpMin, a.min, w.mAl), w.mAl);
  101. } else {
  102. obj.AddMember("max", MakeValueCast<int64_t>(vTmpMax, a.max, w.mAl), w.mAl);
  103. obj.AddMember("min", MakeValueCast<int64_t>(vTmpMin, a.min, w.mAl), w.mAl);
  104. }
  105. }
  106. inline void Write(Value& obj, Animation& a, AssetWriter& w)
  107. {
  108. /****************** Channels *******************/
  109. Value channels;
  110. channels.SetArray();
  111. channels.Reserve(unsigned(a.Channels.size()), w.mAl);
  112. for (size_t i = 0; i < unsigned(a.Channels.size()); ++i) {
  113. Animation::AnimChannel& c = a.Channels[i];
  114. Value valChannel;
  115. valChannel.SetObject();
  116. {
  117. valChannel.AddMember("sampler", c.sampler, w.mAl);
  118. Value valTarget;
  119. valTarget.SetObject();
  120. {
  121. valTarget.AddMember("id", StringRef(c.target.id->id), w.mAl);
  122. valTarget.AddMember("path", c.target.path, w.mAl);
  123. }
  124. valChannel.AddMember("target", valTarget, w.mAl);
  125. }
  126. channels.PushBack(valChannel, w.mAl);
  127. }
  128. obj.AddMember("channels", channels, w.mAl);
  129. /****************** Parameters *******************/
  130. Value valParameters;
  131. valParameters.SetObject();
  132. {
  133. if (a.Parameters.TIME) {
  134. valParameters.AddMember("TIME", StringRef(a.Parameters.TIME->id), w.mAl);
  135. }
  136. if (a.Parameters.rotation) {
  137. valParameters.AddMember("rotation", StringRef(a.Parameters.rotation->id), w.mAl);
  138. }
  139. if (a.Parameters.scale) {
  140. valParameters.AddMember("scale", StringRef(a.Parameters.scale->id), w.mAl);
  141. }
  142. if (a.Parameters.translation) {
  143. valParameters.AddMember("translation", StringRef(a.Parameters.translation->id), w.mAl);
  144. }
  145. }
  146. obj.AddMember("parameters", valParameters, w.mAl);
  147. /****************** Samplers *******************/
  148. Value valSamplers;
  149. valSamplers.SetObject();
  150. for (size_t i = 0; i < unsigned(a.Samplers.size()); ++i) {
  151. Animation::AnimSampler& s = a.Samplers[i];
  152. Value valSampler;
  153. valSampler.SetObject();
  154. {
  155. valSampler.AddMember("input", s.input, w.mAl);
  156. valSampler.AddMember("interpolation", s.interpolation, w.mAl);
  157. valSampler.AddMember("output", s.output, w.mAl);
  158. }
  159. valSamplers.AddMember(StringRef(s.id), valSampler, w.mAl);
  160. }
  161. obj.AddMember("samplers", valSamplers, w.mAl);
  162. }
  163. inline void Write(Value& obj, Buffer& b, AssetWriter& w)
  164. {
  165. const char* type;
  166. switch (b.type) {
  167. case Buffer::Type_text:
  168. type = "text"; break;
  169. default:
  170. type = "arraybuffer";
  171. }
  172. obj.AddMember("byteLength", static_cast<uint64_t>(b.byteLength), w.mAl);
  173. obj.AddMember("type", StringRef(type), w.mAl);
  174. obj.AddMember("uri", Value(b.GetURI(), w.mAl).Move(), w.mAl);
  175. }
  176. inline void Write(Value& obj, BufferView& bv, AssetWriter& w)
  177. {
  178. obj.AddMember("buffer", Value(bv.buffer->id, w.mAl).Move(), w.mAl);
  179. obj.AddMember("byteOffset", static_cast<uint64_t>(bv.byteOffset), w.mAl);
  180. obj.AddMember("byteLength", static_cast<uint64_t>(bv.byteLength), w.mAl);
  181. if (bv.target != BufferViewTarget_NONE) {
  182. obj.AddMember("target", int(bv.target), w.mAl);
  183. }
  184. }
  185. inline void Write(Value& /*obj*/, Camera& /*c*/, AssetWriter& /*w*/)
  186. {
  187. }
  188. inline void Write(Value& obj, Image& img, AssetWriter& w)
  189. {
  190. std::string uri;
  191. if (w.mAsset.extensionsUsed.KHR_binary_glTF && img.bufferView) {
  192. Value exts, ext;
  193. exts.SetObject();
  194. ext.SetObject();
  195. ext.AddMember("bufferView", StringRef(img.bufferView->id), w.mAl);
  196. if (!img.mimeType.empty())
  197. ext.AddMember("mimeType", StringRef(img.mimeType), w.mAl);
  198. exts.AddMember("KHR_binary_glTF", ext, w.mAl);
  199. obj.AddMember("extensions", exts, w.mAl);
  200. return;
  201. }
  202. else if (img.HasData()) {
  203. uri = "data:" + (img.mimeType.empty() ? "application/octet-stream" : img.mimeType);
  204. uri += ";base64,";
  205. Base64::Encode(img.GetData(), img.GetDataLength(), uri);
  206. }
  207. else {
  208. uri = img.uri;
  209. }
  210. obj.AddMember("uri", Value(uri, w.mAl).Move(), w.mAl);
  211. }
  212. namespace {
  213. inline void WriteColorOrTex(Value& obj, TexProperty& prop, const char* propName, MemoryPoolAllocator<>& al)
  214. {
  215. if (prop.texture)
  216. obj.AddMember(StringRef(propName), Value(prop.texture->id, al).Move(), al);
  217. else {
  218. Value col;
  219. obj.AddMember(StringRef(propName), MakeValue(col, prop.color, al), al);
  220. }
  221. }
  222. }
  223. inline void Write(Value& obj, Material& m, AssetWriter& w)
  224. {
  225. Value v;
  226. v.SetObject();
  227. {
  228. WriteColorOrTex(v, m.ambient, "ambient", w.mAl);
  229. WriteColorOrTex(v, m.diffuse, "diffuse", w.mAl);
  230. WriteColorOrTex(v, m.specular, "specular", w.mAl);
  231. WriteColorOrTex(v, m.emission, "emission", w.mAl);
  232. if (m.transparent)
  233. v.AddMember("transparency", m.transparency, w.mAl);
  234. v.AddMember("shininess", m.shininess, w.mAl);
  235. }
  236. obj.AddMember("values", v, w.mAl);
  237. }
  238. namespace {
  239. inline void WriteAttrs(AssetWriter& w, Value& attrs, Mesh::AccessorList& lst,
  240. const char* semantic, bool forceNumber = false)
  241. {
  242. if (lst.empty()) return;
  243. if (lst.size() == 1 && !forceNumber) {
  244. attrs.AddMember(StringRef(semantic), Value(lst[0]->id, w.mAl).Move(), w.mAl);
  245. }
  246. else {
  247. for (size_t i = 0; i < lst.size(); ++i) {
  248. char buffer[32];
  249. ai_snprintf(buffer, 32, "%s_%d", semantic, int(i));
  250. attrs.AddMember(Value(buffer, w.mAl).Move(), Value(lst[i]->id, w.mAl).Move(), w.mAl);
  251. }
  252. }
  253. }
  254. }
  255. inline void Write(Value& obj, Mesh& m, AssetWriter& w)
  256. {
  257. /********************* Name **********************/
  258. obj.AddMember("name", m.name, w.mAl);
  259. /**************** Mesh extensions ****************/
  260. if(m.Extension.size() > 0)
  261. {
  262. Value json_extensions;
  263. json_extensions.SetObject();
  264. #ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
  265. for(Mesh::SExtension* ptr_ext : m.Extension)
  266. {
  267. switch(ptr_ext->Type)
  268. {
  269. case Mesh::SExtension::EType::Compression_Open3DGC:
  270. {
  271. Value json_comp_data;
  272. Mesh::SCompression_Open3DGC* ptr_ext_comp = (Mesh::SCompression_Open3DGC*)ptr_ext;
  273. // filling object "compressedData"
  274. json_comp_data.SetObject();
  275. json_comp_data.AddMember("buffer", ptr_ext_comp->Buffer, w.mAl);
  276. json_comp_data.AddMember("byteOffset", static_cast<uint64_t>(ptr_ext_comp->Offset), w.mAl);
  277. json_comp_data.AddMember("componentType", 5121, w.mAl);
  278. json_comp_data.AddMember("type", "SCALAR", w.mAl);
  279. json_comp_data.AddMember("count", static_cast<uint64_t>(ptr_ext_comp->Count), w.mAl);
  280. if(ptr_ext_comp->Binary)
  281. json_comp_data.AddMember("mode", "binary", w.mAl);
  282. else
  283. json_comp_data.AddMember("mode", "ascii", w.mAl);
  284. json_comp_data.AddMember("indicesCount", static_cast<uint64_t>(ptr_ext_comp->IndicesCount), w.mAl);
  285. json_comp_data.AddMember("verticesCount", static_cast<uint64_t>(ptr_ext_comp->VerticesCount), w.mAl);
  286. // filling object "Open3DGC-compression"
  287. Value json_o3dgc;
  288. json_o3dgc.SetObject();
  289. json_o3dgc.AddMember("compressedData", json_comp_data, w.mAl);
  290. // add member to object "extensions"
  291. json_extensions.AddMember("Open3DGC-compression", json_o3dgc, w.mAl);
  292. }
  293. break;
  294. default:
  295. throw DeadlyImportError("GLTF: Can not write mesh: unknown mesh extension, only Open3DGC is supported.");
  296. }// switch(ptr_ext->Type)
  297. }// for(Mesh::SExtension* ptr_ext : m.Extension)
  298. #endif
  299. // Add extensions to mesh
  300. obj.AddMember("extensions", json_extensions, w.mAl);
  301. }// if(m.Extension.size() > 0)
  302. /****************** Primitives *******************/
  303. Value primitives;
  304. primitives.SetArray();
  305. primitives.Reserve(unsigned(m.primitives.size()), w.mAl);
  306. for (size_t i = 0; i < m.primitives.size(); ++i) {
  307. Mesh::Primitive& p = m.primitives[i];
  308. Value prim;
  309. prim.SetObject();
  310. {
  311. prim.AddMember("mode", Value(int(p.mode)).Move(), w.mAl);
  312. if (p.material)
  313. prim.AddMember("material", p.material->id, w.mAl);
  314. if (p.indices)
  315. prim.AddMember("indices", Value(p.indices->id, w.mAl).Move(), w.mAl);
  316. Value attrs;
  317. attrs.SetObject();
  318. {
  319. WriteAttrs(w, attrs, p.attributes.position, "POSITION");
  320. WriteAttrs(w, attrs, p.attributes.normal, "NORMAL");
  321. WriteAttrs(w, attrs, p.attributes.texcoord, "TEXCOORD", true);
  322. WriteAttrs(w, attrs, p.attributes.color, "COLOR");
  323. WriteAttrs(w, attrs, p.attributes.joint, "JOINT");
  324. WriteAttrs(w, attrs, p.attributes.jointmatrix, "JOINTMATRIX");
  325. WriteAttrs(w, attrs, p.attributes.weight, "WEIGHT");
  326. }
  327. prim.AddMember("attributes", attrs, w.mAl);
  328. }
  329. primitives.PushBack(prim, w.mAl);
  330. }
  331. obj.AddMember("primitives", primitives, w.mAl);
  332. }
  333. inline void Write(Value& obj, Node& n, AssetWriter& w)
  334. {
  335. if (n.matrix.isPresent) {
  336. Value val;
  337. obj.AddMember("matrix", MakeValue(val, n.matrix.value, w.mAl).Move(), w.mAl);
  338. }
  339. if (n.translation.isPresent) {
  340. Value val;
  341. obj.AddMember("translation", MakeValue(val, n.translation.value, w.mAl).Move(), w.mAl);
  342. }
  343. if (n.scale.isPresent) {
  344. Value val;
  345. obj.AddMember("scale", MakeValue(val, n.scale.value, w.mAl).Move(), w.mAl);
  346. }
  347. if (n.rotation.isPresent) {
  348. Value val;
  349. obj.AddMember("rotation", MakeValue(val, n.rotation.value, w.mAl).Move(), w.mAl);
  350. }
  351. AddRefsVector(obj, "children", n.children, w.mAl);
  352. AddRefsVector(obj, "meshes", n.meshes, w.mAl);
  353. AddRefsVector(obj, "skeletons", n.skeletons, w.mAl);
  354. if (n.skin) {
  355. obj.AddMember("skin", Value(n.skin->id, w.mAl).Move(), w.mAl);
  356. }
  357. if (!n.jointName.empty()) {
  358. obj.AddMember("jointName", n.jointName, w.mAl);
  359. }
  360. }
  361. inline void Write(Value& /*obj*/, Program& /*b*/, AssetWriter& /*w*/)
  362. {
  363. }
  364. inline void Write(Value& obj, Sampler& b, AssetWriter& w)
  365. {
  366. if (b.wrapS) {
  367. obj.AddMember("wrapS", b.wrapS, w.mAl);
  368. }
  369. if (b.wrapT) {
  370. obj.AddMember("wrapT", b.wrapT, w.mAl);
  371. }
  372. if (b.magFilter) {
  373. obj.AddMember("magFilter", b.magFilter, w.mAl);
  374. }
  375. if (b.minFilter) {
  376. obj.AddMember("minFilter", b.minFilter, w.mAl);
  377. }
  378. }
  379. inline void Write(Value& scene, Scene& s, AssetWriter& w)
  380. {
  381. AddRefsVector(scene, "nodes", s.nodes, w.mAl);
  382. }
  383. inline void Write(Value& /*obj*/, Shader& /*b*/, AssetWriter& /*w*/)
  384. {
  385. }
  386. inline void Write(Value& obj, Skin& b, AssetWriter& w)
  387. {
  388. /****************** jointNames *******************/
  389. Value vJointNames;
  390. vJointNames.SetArray();
  391. vJointNames.Reserve(unsigned(b.jointNames.size()), w.mAl);
  392. for (size_t i = 0; i < unsigned(b.jointNames.size()); ++i) {
  393. vJointNames.PushBack(StringRef(b.jointNames[i]->jointName), w.mAl);
  394. }
  395. obj.AddMember("jointNames", vJointNames, w.mAl);
  396. if (b.bindShapeMatrix.isPresent) {
  397. Value val;
  398. obj.AddMember("bindShapeMatrix", MakeValue(val, b.bindShapeMatrix.value, w.mAl).Move(), w.mAl);
  399. }
  400. if (b.inverseBindMatrices) {
  401. obj.AddMember("inverseBindMatrices", Value(b.inverseBindMatrices->id, w.mAl).Move(), w.mAl);
  402. }
  403. }
  404. inline void Write(Value& /*obj*/, Technique& /*b*/, AssetWriter& /*w*/)
  405. {
  406. }
  407. inline void Write(Value& obj, Texture& tex, AssetWriter& w)
  408. {
  409. if (tex.source) {
  410. obj.AddMember("source", Value(tex.source->id, w.mAl).Move(), w.mAl);
  411. }
  412. if (tex.sampler) {
  413. obj.AddMember("sampler", Value(tex.sampler->id, w.mAl).Move(), w.mAl);
  414. }
  415. }
  416. inline void Write(Value& /*obj*/, Light& /*b*/, AssetWriter& /*w*/)
  417. {
  418. }
  419. inline AssetWriter::AssetWriter(Asset& a)
  420. : mDoc()
  421. , mAsset(a)
  422. , mAl(mDoc.GetAllocator())
  423. {
  424. mDoc.SetObject();
  425. WriteMetadata();
  426. WriteExtensionsUsed();
  427. // Dump the contents of the dictionaries
  428. for (size_t i = 0; i < a.mDicts.size(); ++i) {
  429. a.mDicts[i]->WriteObjects(*this);
  430. }
  431. // Add the target scene field
  432. if (mAsset.scene) {
  433. mDoc.AddMember("scene", StringRef(mAsset.scene->id), mAl);
  434. }
  435. }
  436. inline void AssetWriter::WriteFile(const char* path)
  437. {
  438. std::unique_ptr<IOStream> jsonOutFile(mAsset.OpenFile(path, "wt", true));
  439. if (jsonOutFile == 0) {
  440. throw DeadlyExportError("Could not open output file: " + std::string(path));
  441. }
  442. StringBuffer docBuffer;
  443. PrettyWriter<StringBuffer> writer(docBuffer);
  444. if (!mDoc.Accept(writer)) {
  445. throw DeadlyExportError("Failed to write scene data!");
  446. }
  447. if (jsonOutFile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
  448. throw DeadlyExportError("Failed to write scene data!");
  449. }
  450. // Write buffer data to separate .bin files
  451. for (unsigned int i = 0; i < mAsset.buffers.Size(); ++i) {
  452. Ref<Buffer> b = mAsset.buffers.Get(i);
  453. std::string binPath = b->GetURI();
  454. std::unique_ptr<IOStream> binOutFile(mAsset.OpenFile(binPath, "wb", true));
  455. if (binOutFile == 0) {
  456. throw DeadlyExportError("Could not open output file: " + binPath);
  457. }
  458. if (b->byteLength > 0) {
  459. if (binOutFile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
  460. throw DeadlyExportError("Failed to write binary file: " + binPath);
  461. }
  462. }
  463. }
  464. }
  465. inline void AssetWriter::WriteGLBFile(const char* path)
  466. {
  467. std::unique_ptr<IOStream> outfile(mAsset.OpenFile(path, "wb", true));
  468. if (outfile == 0) {
  469. throw DeadlyExportError("Could not open output file: " + std::string(path));
  470. }
  471. // we will write the header later, skip its size
  472. outfile->Seek(sizeof(GLB_Header), aiOrigin_SET);
  473. StringBuffer docBuffer;
  474. Writer<StringBuffer> writer(docBuffer);
  475. if (!mDoc.Accept(writer)) {
  476. throw DeadlyExportError("Failed to write scene data!");
  477. }
  478. if (outfile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
  479. throw DeadlyExportError("Failed to write scene data!");
  480. }
  481. WriteBinaryData(outfile.get(), docBuffer.GetSize());
  482. }
  483. inline void AssetWriter::WriteBinaryData(IOStream* outfile, size_t sceneLength)
  484. {
  485. //
  486. // write the body data
  487. //
  488. size_t bodyLength = 0;
  489. if (Ref<Buffer> b = mAsset.GetBodyBuffer()) {
  490. bodyLength = b->byteLength;
  491. if (bodyLength > 0) {
  492. size_t bodyOffset = sizeof(GLB_Header) + sceneLength;
  493. bodyOffset = (bodyOffset + 3) & ~3; // Round up to next multiple of 4
  494. outfile->Seek(bodyOffset, aiOrigin_SET);
  495. if (outfile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
  496. throw DeadlyExportError("Failed to write body data!");
  497. }
  498. }
  499. }
  500. //
  501. // write the header
  502. //
  503. GLB_Header header;
  504. memcpy(header.magic, AI_GLB_MAGIC_NUMBER, sizeof(header.magic));
  505. header.version = 1;
  506. AI_SWAP4(header.version);
  507. header.length = uint32_t(sizeof(header) + sceneLength + bodyLength);
  508. AI_SWAP4(header.length);
  509. header.sceneLength = uint32_t(sceneLength);
  510. AI_SWAP4(header.sceneLength);
  511. header.sceneFormat = SceneFormat_JSON;
  512. AI_SWAP4(header.sceneFormat);
  513. outfile->Seek(0, aiOrigin_SET);
  514. if (outfile->Write(&header, 1, sizeof(header)) != sizeof(header)) {
  515. throw DeadlyExportError("Failed to write the header!");
  516. }
  517. }
  518. inline void AssetWriter::WriteMetadata()
  519. {
  520. Value asset;
  521. asset.SetObject();
  522. asset.AddMember("version", Value(mAsset.asset.version, mAl).Move(), mAl);
  523. asset.AddMember("generator", Value(mAsset.asset.generator, mAl).Move(), mAl);
  524. if (!mAsset.asset.copyright.empty())
  525. asset.AddMember("copyright", Value(mAsset.asset.copyright, mAl).Move(), mAl);
  526. mDoc.AddMember("asset", asset, mAl);
  527. }
  528. inline void AssetWriter::WriteExtensionsUsed()
  529. {
  530. Value exts;
  531. exts.SetArray();
  532. {
  533. if (false)
  534. exts.PushBack(StringRef("KHR_binary_glTF"), mAl);
  535. if (false)
  536. exts.PushBack(StringRef("KHR_materials_common"), mAl);
  537. }
  538. if (!exts.Empty())
  539. mDoc.AddMember("extensionsUsed", exts, mAl);
  540. }
  541. template<class T>
  542. void AssetWriter::WriteObjects(LazyDict<T>& d)
  543. {
  544. if (d.mObjs.empty()) return;
  545. Value* container = &mDoc;
  546. if (d.mExtId) {
  547. Value* exts = FindObject(mDoc, "extensions");
  548. if (!exts) {
  549. mDoc.AddMember("extensions", Value().SetObject().Move(), mDoc.GetAllocator());
  550. exts = FindObject(mDoc, "extensions");
  551. }
  552. if (!(container = FindObject(*exts, d.mExtId))) {
  553. exts->AddMember(StringRef(d.mExtId), Value().SetObject().Move(), mDoc.GetAllocator());
  554. container = FindObject(*exts, d.mExtId);
  555. }
  556. }
  557. Value* dict;
  558. if (!(dict = FindObject(*container, d.mDictId))) {
  559. container->AddMember(StringRef(d.mDictId), Value().SetObject().Move(), mDoc.GetAllocator());
  560. dict = FindObject(*container, d.mDictId);
  561. }
  562. for (size_t i = 0; i < d.mObjs.size(); ++i) {
  563. if (d.mObjs[i]->IsSpecial()) continue;
  564. Value obj;
  565. obj.SetObject();
  566. if (!d.mObjs[i]->name.empty()) {
  567. obj.AddMember("name", StringRef(d.mObjs[i]->name.c_str()), mAl);
  568. }
  569. Write(obj, *d.mObjs[i], *this);
  570. dict->AddMember(StringRef(d.mObjs[i]->id), obj, mAl);
  571. }
  572. }
  573. template<class T>
  574. void WriteLazyDict(LazyDict<T>& d, AssetWriter& w)
  575. {
  576. w.WriteObjects(d);
  577. }
  578. #if _MSC_VER
  579. # pragma warning(pop)
  580. #endif // _WIN32
  581. }