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73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
58 lines
2.6 KiB
C++
58 lines
2.6 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_ATTRIBUTES_SEQUENTIAL_NORMAL_ATTRIBUTE_ENCODER_H_
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#define DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_NORMAL_ATTRIBUTE_ENCODER_H_
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#include "compression/attributes/prediction_schemes/prediction_scheme_encoder_factory.h"
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#include "compression/attributes/prediction_schemes/prediction_scheme_normal_octahedron_canonicalized_transform.h"
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#include "compression/attributes/sequential_integer_attribute_encoder.h"
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namespace draco {
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// Class for encoding normal vectors using an octahedral encoding (see Cigolle
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// et al.'14 “A Survey of Efficient Representations for Independent Unit
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// Vectors”. Compared to the basic quantization encoder, this encoder results
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// in a better compression rate under the same accuracy settings. Note that this
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// encoder doesn't preserve the lengths of input vectors, therefore it will not
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// work correctly when the input values are not normalized.
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class SequentialNormalAttributeEncoder
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: public SequentialIntegerAttributeEncoder {
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public:
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uint8_t GetUniqueId() const override {
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return SEQUENTIAL_ATTRIBUTE_ENCODER_NORMALS;
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}
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bool IsLossyEncoder() const override { return true; }
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protected:
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bool Initialize(PointCloudEncoder *encoder, int attribute_id) override;
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bool PrepareValues(const std::vector<PointIndex> &point_ids) override;
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std::unique_ptr<PredictionSchemeTypedInterface<int32_t>>
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CreateIntPredictionScheme(PredictionSchemeMethod /* method */) override {
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typedef PredictionSchemeNormalOctahedronCanonicalizedTransform<int32_t>
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Transform;
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const int32_t quantization_bits = encoder()->options()->GetAttributeInt(
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attribute_id(), "quantization_bits", -1);
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const int32_t max_value = (1 << quantization_bits) - 1;
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const Transform transform(max_value);
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return CreatePredictionSchemeForEncoder<int32_t, Transform>(
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PREDICTION_DIFFERENCE, attribute_id(), encoder(), transform);
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}
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};
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} // namespace draco
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#endif // DRACO_COMPRESSION_ATTRIBUTES_SEQUENTIAL_NORMAL_ATTRIBUTE_ENCODER_H_
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