Differential D4501 Diff 14126 extern/gltf-draco/draco/src/draco/compression/point_cloud/algorithms/quantize_points_3.h

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extern/gltf-draco/draco/src/draco/compression/point_cloud/algorithms/quantize_points_3.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_POINT_CLOUD_ALGORITHMS_QUANTIZE_POINTS_3_H_
				#define DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_QUANTIZE_POINTS_3_H_

				#include <inttypes.h>
				#include "draco/compression/point_cloud/algorithms/point_cloud_types.h"
				#include "draco/core/quantization_utils.h"

				namespace draco {

				// TODO(hemmer): Make this a stable bounding box.
				struct QuantizationInfo {
				uint32_t quantization_bits;
				float range;
				};

				template <class PointIterator, class OutputIterator>
				OutputIterator QuantizePoints3(const PointIterator &begin,
				const PointIterator &end, QuantizationInfo *info,
				OutputIterator oit) {
				DRACO_DCHECK_GE(info->quantization_bits, 0);

				float max_range = 0;
				for (auto it = begin; it != end; ++it) {
				max_range = std::max(std::fabs((*it)[0]), max_range);
				max_range = std::max(std::fabs((*it)[1]), max_range);
				max_range = std::max(std::fabs((*it)[2]), max_range);
				}

				const uint32_t max_quantized_value((1 << info->quantization_bits) - 1);
				Quantizer quantize;
				quantize.Init(max_range, max_quantized_value);
				info->range = max_range;

				Point3ui qpoint;
				for (auto it = begin; it != end; ++it) {
				// Quantize and all positive.
				qpoint[0] = quantize((*it)[0]) + max_quantized_value;
				qpoint[1] = quantize((*it)[1]) + max_quantized_value;
				qpoint[2] = quantize((*it)[2]) + max_quantized_value;
				*oit++ = (qpoint);
				}

				return oit;
				}

				template <class QPointIterator, class OutputIterator>
				void DequantizePoints3(const QPointIterator &begin, const QPointIterator &end,
				const QuantizationInfo &info, OutputIterator &oit) {
				DRACO_DCHECK_GE(info.quantization_bits, 0);
				DRACO_DCHECK_GE(info.range, 0);

				const uint32_t quantization_bits = info.quantization_bits;
				const float range = info.range;
				const uint32_t max_quantized_value((1 << quantization_bits) - 1);
				Dequantizer dequantize;
				dequantize.Init(range, max_quantized_value);

				for (auto it = begin; it != end; ++it) {
				const float x = dequantize((*it)[0] - max_quantized_value);
				const float y = dequantize((*it)[1] - max_quantized_value);
				const float z = dequantize((*it)[2] - max_quantized_value);
				*oit = Point3f(x, y, z);
				++oit;
				}
				}

				} // namespace draco

				#endif // DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_QUANTIZE_POINTS_3_H_