glTF: add Draco shared library for mesh compression.

Draco is added as a library under extern/ and builds a shared library that is
installed into the Python site-packages. This is then loaded by the glTF add-on
to do mesh compression.

Differential Revision: https://developer.blender.org/D4501

1 files changed, 50 insertions, 0 deletions

diff --git a/extern/draco/dracoenc/src/draco/compression/attributes/sequential_normal_attribute_encoder.cc b/extern/draco/dracoenc/src/draco/compression/attributes/sequential_normal_attribute_encoder.cc
new file mode 100644
index 00000000000..af207a87111
--- /dev/null
+++ b/extern/draco/dracoenc/src/draco/compression/attributes/sequential_normal_attribute_encoder.cc
@@ -0,0 +1,50 @@
+// 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_encoder.h"
+#include "draco/compression/attributes/normal_compression_utils.h"
+
+namespace draco {
+
+bool SequentialNormalAttributeEncoder::Init(PointCloudEncoder *encoder,
+                                            int attribute_id) {
+  if (!SequentialIntegerAttributeEncoder::Init(encoder, attribute_id))
+    return false;
+  // Currently this encoder works only for 3-component normal vectors.
+  if (attribute()->num_components() != 3)
+    return false;
+
+  // Initialize AttributeOctahedronTransform.
+  const int quantization_bits = encoder->options()->GetAttributeInt(
+      attribute_id, "quantization_bits", -1);
+  if (quantization_bits < 1)
+    return false;
+  attribute_octahedron_transform_.SetParameters(quantization_bits);
+  return true;
+}
+
+bool SequentialNormalAttributeEncoder::EncodeDataNeededByPortableTransform(
+    EncoderBuffer *out_buffer) {
+  return attribute_octahedron_transform_.EncodeParameters(out_buffer);
+}
+
+bool SequentialNormalAttributeEncoder::PrepareValues(
+    const std::vector<PointIndex> &point_ids, int num_points) {
+  SetPortableAttribute(
+      attribute_octahedron_transform_.GeneratePortableAttribute(
+          *(attribute()), point_ids, num_points));
+  return true;
+}
+
+}  // namespace draco