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extern/gltf-draco/draco/src/draco/io/mesh_io.h
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| // Copyright 2016 The Draco Authors. | |||||
| // | |||||
| // Licensed under the Apache License, Version 2.0 (the "License"); | |||||
| // you may not use this file except in compliance with the License. | |||||
| // You may obtain a copy of the License at | |||||
| // | |||||
| // http://www.apache.org/licenses/LICENSE-2.0 | |||||
| // | |||||
| // Unless required by applicable law or agreed to in writing, software | |||||
| // distributed under the License is distributed on an "AS IS" BASIS, | |||||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||||
| // See the License for the specific language governing permissions and | |||||
| // limitations under the License. | |||||
| // | |||||
| #ifndef DRACO_MESH_MESH_IO_H_ | |||||
| #define DRACO_MESH_MESH_IO_H_ | |||||
| #include "draco/compression/config/compression_shared.h" | |||||
| #include "draco/compression/decode.h" | |||||
| #include "draco/compression/expert_encode.h" | |||||
| namespace draco { | |||||
| template <typename OutStreamT> | |||||
| OutStreamT WriteMeshIntoStream(const Mesh *mesh, OutStreamT &&os, | |||||
| MeshEncoderMethod method, | |||||
| const EncoderOptions &options) { | |||||
| EncoderBuffer buffer; | |||||
| EncoderOptions local_options = options; | |||||
| ExpertEncoder encoder(*mesh); | |||||
| encoder.Reset(local_options); | |||||
| encoder.SetEncodingMethod(method); | |||||
| if (!encoder.EncodeToBuffer(&buffer).ok()) { | |||||
| os.setstate(std::ios_base::badbit); | |||||
| return os; | |||||
| } | |||||
| os.write(static_cast<const char *>(buffer.data()), buffer.size()); | |||||
| return os; | |||||
| } | |||||
| template <typename OutStreamT> | |||||
| OutStreamT WriteMeshIntoStream(const Mesh *mesh, OutStreamT &&os, | |||||
| MeshEncoderMethod method) { | |||||
| const EncoderOptions options = EncoderOptions::CreateDefaultOptions(); | |||||
| return WriteMeshIntoStream(mesh, os, method, options); | |||||
| } | |||||
| template <typename OutStreamT> | |||||
| OutStreamT &WriteMeshIntoStream(const Mesh *mesh, OutStreamT &&os) { | |||||
| return WriteMeshIntoStream(mesh, os, MESH_EDGEBREAKER_ENCODING); | |||||
| } | |||||
| template <typename InStreamT> | |||||
| InStreamT &ReadMeshFromStream(std::unique_ptr<Mesh> *mesh, InStreamT &&is) { | |||||
| // Determine size of stream and write into a vector | |||||
| const auto start_pos = is.tellg(); | |||||
| is.seekg(0, std::ios::end); | |||||
| const std::streampos is_size = is.tellg() - start_pos; | |||||
| is.seekg(start_pos); | |||||
| std::vector<char> data(is_size); | |||||
| is.read(&data[0], is_size); | |||||
| // Create a mesh from that data. | |||||
| DecoderBuffer buffer; | |||||
| buffer.Init(&data[0], data.size()); | |||||
| Decoder decoder; | |||||
| auto statusor = decoder.DecodeMeshFromBuffer(&buffer); | |||||
| *mesh = std::move(statusor).value(); | |||||
| if (!statusor.ok() || *mesh == nullptr) { | |||||
| is.setstate(std::ios_base::badbit); | |||||
| } | |||||
| return is; | |||||
| } | |||||
| // Reads a mesh from a file. The function automatically chooses the correct | |||||
| // decoder based on the extension of the files. Currently, .obj and .ply files | |||||
| // are supported. Other file extensions are processed by the default | |||||
| // draco::MeshDecoder. | |||||
| // Returns nullptr with an error status if the decoding failed. | |||||
| StatusOr<std::unique_ptr<Mesh>> ReadMeshFromFile(const std::string &file_name); | |||||
| // Reads a mesh from a file. The function does the same thing as the previous | |||||
| // one except using metadata to encode additional information when | |||||
| // |use_metadata| is set to true. | |||||
| // Returns nullptr with an error status if the decoding failed. | |||||
| StatusOr<std::unique_ptr<Mesh>> ReadMeshFromFile(const std::string &file_name, | |||||
| bool use_metadata); | |||||
| } // namespace draco | |||||
| #endif // DRACO_MESH_MESH_IO_H_ | |||||