Differential D4501 Diff 14677 extern/draco/dracoenc/src/draco/compression/mesh/mesh_encoder_helpers.h

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extern/draco/dracoenc/src/draco/compression/mesh/mesh_encoder_helpers.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_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_