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82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef DRACO_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
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#define DRACO_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
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#include "compression/mesh/mesh_encoder.h"
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#include "mesh/triangle_soup_mesh_builder.h"
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namespace draco {
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// Helper class for encoding data supplied in a stream of single precision
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// floating point numbers formatted as XYZ|UV. The stream must contain three
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// XYZ|UV values for every face of the mesh.
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// The encoded data is written into the output stream "os".
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// In case of error, the stream is set to an invalid state (ios_base::bad_bit).
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template <typename OStreamT>
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OStreamT EncodePos3Tex2DataToStream(
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const float *data, int num_faces, CompressionMethod method,
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const MeshCompressionOptions &compression_options,
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const MeshAttributeCompressionOptions &pos_options,
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const MeshAttributeCompressionOptions &tex_options, OStreamT &&os) {
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// Build the mesh.
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TriangleSoupMeshBuilder mb;
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mb.Start(num_faces);
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const int pos_att_id =
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mb.AddAttribute(GeometryAttribute::POSITION, 3, DT_FLOAT32);
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const int tex_att_id =
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mb.AddAttribute(GeometryAttribute::TEX_COORD_0, 2, DT_FLOAT32);
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constexpr int data_stride = 5;
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constexpr int tex_offset = 3;
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for (int f = 0; f < num_faces; ++f) {
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int offset = 3 * f * data_stride;
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// Add position data for the face.
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mb.SetAttributeValuesForFace(pos_att_id, f, data + offset,
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data + offset + data_stride,
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data + offset + 2 * data_stride);
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// Add texture data for the face.
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offset += tex_offset;
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mb.SetAttributeValuesForFace(tex_att_id, f, data + offset,
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data + offset + data_stride,
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data + offset + 2 * data_stride);
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}
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std::unique_ptr<Mesh> mesh = mb.Finalize();
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if (mesh == nullptr) {
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os.setstate(ios_base::badbit);
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return os;
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}
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// Set up the encoder.
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std::unique_ptr<MeshEncoder> encoder =
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MeshEncoder::CreateEncoderForMethod(method);
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encoder->SetGlobalOptions(compression_options);
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encoder->SetAttributeOptions(GeometryAttribute::POSITION, pos_options);
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encoder->SetAttributeOptions(GeometryAttribute::TEX_COORD_0, tex_options);
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if (!encoder->EncodeMesh(mesh.get())) {
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os.setstate(ios_base::badbit);
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return os;
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}
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// Write the encoded data into the stream.
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os.write(static_cast<const char *>(encoder->buffer()->data()),
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encoder->buffer()->size());
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return os;
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}
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} // namespace draco
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#endif // DRACO_COMPRESSION_MESH_MESH_ENCODER_HELPERS_H_
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