FBX2glTF/src/gltf/GltfModel.cpp

87 lines
3.1 KiB
C++

/**
* Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#include "GltfModel.hpp"
std::shared_ptr<BufferViewData> GltfModel::GetAlignedBufferView(
BufferData& buffer,
const BufferViewData::GL_ArrayType target) {
uint32_t bufferSize = to_uint32(this->binary->size());
if ((bufferSize % 4) > 0) {
bufferSize += (4 - (bufferSize % 4));
this->binary->resize(bufferSize);
}
return this->bufferViews.hold(new BufferViewData(buffer, bufferSize, target));
}
// add a bufferview on the fly and copy data into it
std::shared_ptr<BufferViewData>
GltfModel::AddRawBufferView(BufferData& buffer, const char* source, uint32_t bytes) {
auto bufferView = GetAlignedBufferView(buffer, BufferViewData::GL_ARRAY_NONE);
bufferView->byteLength = bytes;
// make space for the new bytes (possibly moving the underlying data)
uint32_t bufferSize = to_uint32(this->binary->size());
this->binary->resize(bufferSize + bytes);
// and copy them into place
memcpy(&(*this->binary)[bufferSize], source, bytes);
return bufferView;
}
std::shared_ptr<BufferViewData> GltfModel::AddBufferViewForFile(
BufferData& buffer,
const std::string& filename) {
// see if we've already created a BufferViewData for this precise file
auto iter = filenameToBufferView.find(filename);
if (iter != filenameToBufferView.end()) {
return iter->second;
}
std::shared_ptr<BufferViewData> result;
std::ifstream file(filename, std::ios::binary | std::ios::ate);
if (file) {
std::streamsize size = file.tellg();
file.seekg(0, std::ios::beg);
std::vector<char> fileBuffer(size);
if (file.read(fileBuffer.data(), size)) {
result = AddRawBufferView(buffer, fileBuffer.data(), to_uint32(size));
} else {
fmt::printf("Warning: Couldn't read %lu bytes from %s, skipping file.\n", size, filename);
}
} else {
fmt::printf("Warning: Couldn't open file %s, skipping file.\n", filename);
}
// note that we persist here not only success, but also failure, as nullptr
filenameToBufferView[filename] = result;
return result;
}
void GltfModel::serializeHolders(json& glTFJson) {
serializeHolder(glTFJson, "buffers", buffers);
serializeHolder(glTFJson, "bufferViews", bufferViews);
serializeHolder(glTFJson, "scenes", scenes);
serializeHolder(glTFJson, "accessors", accessors);
serializeHolder(glTFJson, "images", images);
serializeHolder(glTFJson, "samplers", samplers);
serializeHolder(glTFJson, "textures", textures);
serializeHolder(glTFJson, "materials", materials);
serializeHolder(glTFJson, "meshes", meshes);
serializeHolder(glTFJson, "skins", skins);
serializeHolder(glTFJson, "animations", animations);
serializeHolder(glTFJson, "cameras", cameras);
serializeHolder(glTFJson, "nodes", nodes);
if (!lights.ptrs.empty()) {
json lightsJson = json::object();
serializeHolder(lightsJson, "lights", lights);
glTFJson["extensions"][KHR_LIGHTS_PUNCTUAL] = lightsJson;
}
}