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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_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
#define DRACO_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
#include "draco/compression/mesh/mesh_encoder.h"
#include "draco/mesh/triangle_soup_mesh_builder.h"
namespace draco {
// Helper class for encoding data supplied in a stream of single precision
// floating point numbers formatted as XYZ|UV. The stream must contain three
// XYZ|UV values for every face of the mesh.
// The encoded data is written into the output stream "os".
// In case of error, the stream is set to an invalid state (ios_base::bad_bit).
template <typename OStreamT>
OStreamT EncodePos3Tex2DataToStream(
const float *data, int num_faces, CompressionMethod method,
const MeshCompressionOptions &compression_options,
const MeshAttributeCompressionOptions &pos_options,
const MeshAttributeCompressionOptions &tex_options, OStreamT &&os) {
// Build the mesh.
TriangleSoupMeshBuilder mb;
mb.Start(num_faces);
const int pos_att_id =
mb.AddAttribute(GeometryAttribute::POSITION, 3, DT_FLOAT32);
const int tex_att_id =
mb.AddAttribute(GeometryAttribute::TEX_COORD_0, 2, DT_FLOAT32);
constexpr int data_stride = 5;
constexpr int tex_offset = 3;
for (int f = 0; f < num_faces; ++f) {
int offset = 3 * f * data_stride;
// Add position data for the face.
mb.SetAttributeValuesForFace(pos_att_id, f, data + offset,
data + offset + data_stride,
data + offset + 2 * data_stride);
// Add texture data for the face.
offset += tex_offset;
mb.SetAttributeValuesForFace(tex_att_id, f, data + offset,
data + offset + data_stride,
data + offset + 2 * data_stride);
}
std::unique_ptr<Mesh> mesh = mb.Finalize();
if (mesh == nullptr) {
os.setstate(ios_base::badbit);
return os;
}
// Set up the encoder.
std::unique_ptr<MeshEncoder> encoder =
MeshEncoder::CreateEncoderForMethod(method);
encoder->SetGlobalOptions(compression_options);
encoder->SetAttributeOptions(GeometryAttribute::POSITION, pos_options);
encoder->SetAttributeOptions(GeometryAttribute::TEX_COORD_0, tex_options);
if (!encoder->EncodeMesh(mesh.get())) {
os.setstate(ios_base::badbit);
return os;
}
// Write the encoded data into the stream.
os.write(static_cast<const char *>(encoder->buffer()->data()),
encoder->buffer()->size());
return os;
}
} // namespace draco
#endif // DRACO_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
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