Export glTF buffers as separate .bin files

code/glTFAsset.h

@@ -489,6 +489,9 @@ namespace glTF
         bool IsSpecial() const
             { return mIsSpecial; }
 
+        std::string GetURI()
+            { return std::string(this->id) + ".bin"; }
+
         static const char* TranslateId(Asset& r, const char* id);
     };
 

code/glTFAssetWriter.h

@@ -79,6 +79,7 @@ public:
     AssetWriter(Asset& asset);
 
     void WriteFile(const char* path);
+    void WriteGLBFile(const char* path);
 };
 
 }

code/glTFAssetWriter.inl

@@ -94,9 +94,6 @@ namespace glTF {
 
     inline void Write(Value& obj, Buffer& b, AssetWriter& w)
     {
-        std::string dataURI = "data:application/octet-stream;base64,";
-        Util::EncodeBase64(b.GetPointer(), b.byteLength, dataURI);
-
         const char* type;
         switch (b.type) {
             case Buffer::Type_text:
@@ -107,7 +104,7 @@ namespace glTF {
 
         obj.AddMember("byteLength", static_cast<uint64_t>(b.byteLength), w.mAl);
         obj.AddMember("type", StringRef(type), w.mAl);
-        obj.AddMember("uri", Value(dataURI, w.mAl).Move(), w.mAl);
+        obj.AddMember("uri", Value(b.GetURI(), w.mAl).Move(), w.mAl);
     }
 
     inline void Write(Value& obj, BufferView& bv, AssetWriter& w)
@@ -328,40 +325,62 @@ namespace glTF {
 
     inline void AssetWriter::WriteFile(const char* path)
     {
-        bool isBinary = mAsset.extensionsUsed.KHR_binary_glTF;
+        std::unique_ptr<IOStream> jsonOutFile(mAsset.OpenFile(path, "wt", true));
 
-        std::unique_ptr<IOStream> outfile
-            (mAsset.OpenFile(path, isBinary ? "wb" : "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));
         }
 
-        if (isBinary) {
         // we will write the header later, skip its size
         outfile->Seek(sizeof(GLB_Header), aiOrigin_SET);
-        }
 
         StringBuffer docBuffer;
-
-        bool pretty = true; 
-        if (!isBinary && pretty) {
-            PrettyWriter<StringBuffer> writer(docBuffer);
-            mDoc.Accept(writer);
-        }
-        else {
         Writer<StringBuffer> writer(docBuffer);
         mDoc.Accept(writer);
-        }
 
         if (outfile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
             throw DeadlyExportError("Failed to write scene data!");
         }
 
-        if (isBinary) {
         WriteBinaryData(outfile.get(), docBuffer.GetSize());
     }
-    }
 
     inline void AssetWriter::WriteBinaryData(IOStream* outfile, size_t sceneLength)
     {
@@ -385,7 +404,6 @@ namespace glTF {
             }
         }
 
-
         //
         // write the header
         //

code/glTFExporter.cpp

@@ -137,9 +137,13 @@ glTFExporter::glTFExporter(const char* filename, IOSystem* pIOSystem, const aiSc
 
     ExportScene();
 
-
     glTF::AssetWriter writer(*mAsset);
+
+    if (isBinary) {
+        writer.WriteGLBFile(filename);
+    } else {
         writer.WriteFile(filename);
+    }
 }
 
 
@@ -267,6 +271,15 @@ void glTFExporter::ExportMaterials()
 
 void glTFExporter::ExportMeshes()
 {
+    std::string fname = std::string(mFilename);
+    std::string bufferIdPrefix = fname.substr(0, fname.find("."));
+    std::string bufferId = mAsset->FindUniqueID("", bufferIdPrefix.c_str());
+
+    Ref<Buffer> b = mAsset->GetBodyBuffer();
+    if (!b) {
+        b = mAsset->buffers.Create(bufferId);
+    }
+
     for (unsigned int i = 0; i < mScene->mNumMeshes; ++i) {
         const aiMesh* aim = mScene->mMeshes[i];
 
@@ -277,13 +290,6 @@ void glTFExporter::ExportMeshes()
 
         p.material = mAsset->materials.Get(aim->mMaterialIndex);
 
-        std::string bufferId = mAsset->FindUniqueID(meshId, "buffer");
-
-        Ref<Buffer> b = mAsset->GetBodyBuffer();
-        if (!b) {
-            b = mAsset->buffers.Create(bufferId);
-        }
-
         Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
         if (v) p.attributes.position.push_back(v);