1 files changed, 94 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/compression/attributes/sequential_normal_attribute_decoder.cc b/extern/draco/draco/src/draco/compression/attributes/sequential_normal_attribute_decoder.cc
new file mode 100644
index 00000000000..017344393dc
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+++ b/extern/draco/draco/src/draco/compression/attributes/sequential_normal_attribute_decoder.cc
@@ -0,0 +1,94 @@
+// 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.
+//
+#include "draco/compression/attributes/sequential_normal_attribute_decoder.h"
+
+#include "draco/attributes/attribute_octahedron_transform.h"
+#include "draco/compression/attributes/normal_compression_utils.h"
+
+namespace draco {
+
+SequentialNormalAttributeDecoder::SequentialNormalAttributeDecoder()
+    : quantization_bits_(-1) {}
+
+bool SequentialNormalAttributeDecoder::Init(PointCloudDecoder *decoder,
+                                            int attribute_id) {
+  if (!SequentialIntegerAttributeDecoder::Init(decoder, attribute_id))
+    return false;
+  // Currently, this encoder works only for 3-component normal vectors.
+  if (attribute()->num_components() != 3) {
+    return false;
+  }
+  // Also the data type must be DT_FLOAT32.
+  if (attribute()->data_type() != DT_FLOAT32) {
+    return false;
+  }
+  return true;
+}
+
+bool SequentialNormalAttributeDecoder::DecodeIntegerValues(
+    const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
+#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
+  if (decoder()->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
+    uint8_t quantization_bits;
+    if (!in_buffer->Decode(&quantization_bits)) {
+      return false;
+    }
+    quantization_bits_ = quantization_bits;
+  }
+#endif
+  return SequentialIntegerAttributeDecoder::DecodeIntegerValues(point_ids,
+                                                                in_buffer);
+}
+
+bool SequentialNormalAttributeDecoder::DecodeDataNeededByPortableTransform(
+    const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
+  if (decoder()->bitstream_version() >= DRACO_BITSTREAM_VERSION(2, 0)) {
+    // For newer file version, decode attribute transform data here.
+    uint8_t quantization_bits;
+    if (!in_buffer->Decode(&quantization_bits)) {
+      return false;
+    }
+    quantization_bits_ = quantization_bits;
+  }
+
+  // Store the decoded transform data in portable attribute.
+  AttributeOctahedronTransform octahedral_transform;
+  octahedral_transform.SetParameters(quantization_bits_);
+  return octahedral_transform.TransferToAttribute(portable_attribute());
+}
+
+bool SequentialNormalAttributeDecoder::StoreValues(uint32_t num_points) {
+  // Convert all quantized values back to floats.
+  const int num_components = attribute()->num_components();
+  const int entry_size = sizeof(float) * num_components;
+  float att_val[3];
+  int quant_val_id = 0;
+  int out_byte_pos = 0;
+  const int32_t *const portable_attribute_data = GetPortableAttributeData();
+  OctahedronToolBox octahedron_tool_box;
+  if (!octahedron_tool_box.SetQuantizationBits(quantization_bits_))
+    return false;
+  for (uint32_t i = 0; i < num_points; ++i) {
+    const int32_t s = portable_attribute_data[quant_val_id++];
+    const int32_t t = portable_attribute_data[quant_val_id++];
+    octahedron_tool_box.QuantizedOctaherdalCoordsToUnitVector(s, t, att_val);
+    // Store the decoded floating point value into the attribute buffer.
+    attribute()->buffer()->Write(out_byte_pos, att_val, entry_size);
+    out_byte_pos += entry_size;
+  }
+  return true;
+}
+
+}  // namespace draco