fix export gltf2, The JOINTS_0 componentType is incorrect

code/glTF2Asset.h

@@ -601,6 +601,7 @@ namespace glTF2
 		/// \param [in] pReplace_Count - count of bytes in new data.
 		/// \return true - if successfully replaced, false if input arguments is out of range.
 		bool ReplaceData(const size_t pBufferData_Offset, const size_t pBufferData_Count, const uint8_t* pReplace_Data, const size_t pReplace_Count);
+		bool ReplaceData_joint(const size_t pBufferData_Offset, const size_t pBufferData_Count, const uint8_t* pReplace_Data, const size_t pReplace_Count);
 
         size_t AppendData(uint8_t* data, size_t length);
         void Grow(size_t amount);

code/glTF2Asset.inl

@@ -481,6 +481,29 @@ uint8_t* new_data;
 
 	return true;
 }
+inline bool Buffer::ReplaceData_joint(const size_t pBufferData_Offset, const size_t pBufferData_Count, const uint8_t* pReplace_Data, const size_t pReplace_Count)
+{
+const size_t new_data_size = byteLength + pReplace_Count - pBufferData_Count;
+
+uint8_t* new_data;
+
+	if((pBufferData_Count == 0) || (pReplace_Count == 0) || (pReplace_Data == nullptr)) return false;
+
+	new_data = new uint8_t[new_data_size];
+	// Copy data which place before replacing part.
+	memcpy(new_data, mData.get(), pBufferData_Offset);
+	// Copy new data.
+	memcpy(&new_data[pBufferData_Offset], pReplace_Data, pReplace_Count);
+	// Copy data which place after replacing part.
+    memcpy(&new_data[pBufferData_Offset + pReplace_Count], &mData.get()[pBufferData_Offset + pBufferData_Count]
+            , new_data_size - (pBufferData_Offset + pReplace_Count)
+          );
+	// Apply new data
+	mData.reset(new_data, std::default_delete<uint8_t[]>());
+	byteLength = new_data_size;
+
+	return true;
+}
 
 inline size_t Buffer::AppendData(uint8_t* data, size_t length)
 {

code/glTF2Exporter.cpp

@@ -623,6 +623,26 @@ void ExportSkin(Asset& mAsset, const aiMesh* aimesh, Ref<Mesh>& meshRef, Ref<Buf
     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 ) {
+        unsigned int offset = vertexJointAccessor->bufferView->byteOffset;
+        unsigned int bytesLen = vertexJointAccessor->bufferView->byteLength;
+        unsigned int s_bytesPerComp= ComponentTypeSize(ComponentType_UNSIGNED_SHORT);
+        unsigned int bytesPerComp = ComponentTypeSize(vertexJointAccessor->componentType);
+        unsigned int s_bytesLen = bytesLen * s_bytesPerComp / bytesPerComp;
+        Ref<Buffer> buf = vertexJointAccessor->bufferView->buffer;
+        uint8_t* arrys = new uint8_t[s_bytesLen];
+        unsigned int i = 0;
+        for ( unsigned int j = 0; j <= bytesLen; j += bytesPerComp ){
+            size_t len_p = offset + j;
+            float f_value = *(float *)&buf->GetPointer()[len_p];
+            unsigned short c = static_cast<unsigned short>(f_value);
+            uint8_t* data = new uint8_t[s_bytesPerComp];
+            data = (uint8_t*)&c;
+            memcpy(&arrys[i*s_bytesPerComp], data, s_bytesPerComp);
+            ++i;
+        }
+        buf->ReplaceData_joint(offset, bytesLen, arrys, s_bytesLen);
+        vertexJointAccessor->componentType = ComponentType_UNSIGNED_SHORT;
+
         p.attributes.joint.push_back( vertexJointAccessor );
     }