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56 lines
2.1 KiB
C++
56 lines
2.1 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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#include "compression/attributes/sequential_normal_attribute_encoder.h"
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#include "compression/attributes/normal_compression_utils.h"
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namespace draco {
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bool SequentialNormalAttributeEncoder::Initialize(PointCloudEncoder *encoder,
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int attribute_id) {
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if (!SequentialIntegerAttributeEncoder::Initialize(encoder, attribute_id))
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return false;
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// Currently this encoder works only for 3-component normal vectors.
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if (attribute()->components_count() != 3)
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return false;
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return true;
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}
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bool SequentialNormalAttributeEncoder::PrepareValues(
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const std::vector<PointIndex> &point_ids) {
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// Quantize all encoded values.
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const int quantization_bits = encoder()->options()->GetAttributeInt(
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attribute_id(), "quantization_bits", -1);
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encoder()->buffer()->Encode(static_cast<uint8_t>(quantization_bits));
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const int32_t max_quantized_value = (1 << quantization_bits) - 1;
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const float max_quantized_value_f = static_cast<float>(max_quantized_value);
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values()->clear();
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float att_val[3];
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values()->reserve(point_ids.size() * 2);
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for (uint32_t i = 0; i < point_ids.size(); ++i) {
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const AttributeValueIndex att_id = attribute()->mapped_index(point_ids[i]);
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attribute()->GetValue(att_id, att_val);
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// Encode the vector into a s and t octaherdal coordinates.
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int32_t s, t;
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UnitVectorToQuantizedOctahedralCoords(att_val, max_quantized_value_f, &s,
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&t);
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values()->push_back(s);
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values()->push_back(t);
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}
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return true;
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}
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} // namespace draco
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