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/*
* 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.
*/
/**
* @author Jim Eckerlein <eckerlein@ux3d.io>
* @date 2020-11-18
*/
#include "decoder.h"
#include <memory>
#include <vector>
#include <cinttypes>
#include "draco/mesh/mesh.h"
#include "draco/core/decoder_buffer.h"
#include "draco/compression/decode.h"
#define LOG_PREFIX "DracoDecoder | "
struct Decoder {
std::unique_ptr<draco::Mesh> mesh;
std::vector<uint8_t> indexBuffer;
std::map<uint32_t, std::vector<uint8_t>> buffers;
draco::DecoderBuffer decoderBuffer;
uint32_t vertexCount;
uint32_t indexCount;
};
Decoder *decoderCreate()
{
return new Decoder;
}
void decoderRelease(Decoder *decoder)
{
delete decoder;
}
bool decoderDecode(Decoder *decoder, void *data, size_t byteLength)
{
draco::Decoder dracoDecoder;
draco::DecoderBuffer dracoDecoderBuffer;
dracoDecoderBuffer.Init(reinterpret_cast<char *>(data), byteLength);
auto decoderStatus = dracoDecoder.DecodeMeshFromBuffer(&dracoDecoderBuffer);
if (!decoderStatus.ok())
{
printf(LOG_PREFIX "Error during Draco decoding: %s\n", decoderStatus.status().error_msg());
return false;
}
decoder->mesh = std::move(decoderStatus).value();
decoder->vertexCount = decoder->mesh->num_points();
decoder->indexCount = decoder->mesh->num_faces() * 3;
printf(LOG_PREFIX "Decoded %" PRIu32 " vertices, %" PRIu32 " indices\n", decoder->vertexCount, decoder->indexCount);
return true;
}
uint32_t decoderGetVertexCount(Decoder *decoder)
{
return decoder->vertexCount;
}
uint32_t decoderGetIndexCount(Decoder *decoder)
{
return decoder->indexCount;
}
bool decoderAttributeIsNormalized(Decoder *decoder, uint32_t id)
{
const draco::PointAttribute* attribute = decoder->mesh->GetAttributeByUniqueId(id);
return attribute != nullptr && attribute->normalized();
}
bool decoderReadAttribute(Decoder *decoder, uint32_t id, size_t componentType, char *dataType)
{
const draco::PointAttribute* attribute = decoder->mesh->GetAttributeByUniqueId(id);
if (attribute == nullptr)
{
printf(LOG_PREFIX "Attribute with id=%" PRIu32 " does not exist in Draco data\n", id);
return false;
}
size_t stride = getAttributeStride(componentType, dataType);
std::vector<uint8_t> decodedData;
decodedData.resize(stride * decoder->vertexCount);
for (uint32_t i = 0; i < decoder->vertexCount; ++i)
{
auto index = attribute->mapped_index(draco::PointIndex(i));
uint8_t *value = decodedData.data() + i * stride;
bool converted = false;
switch (componentType)
{
case ComponentType::Byte:
converted = attribute->ConvertValue(index, reinterpret_cast<int8_t *>(value));
break;
case ComponentType::UnsignedByte:
converted = attribute->ConvertValue(index, reinterpret_cast<uint8_t *>(value));
break;
case ComponentType::Short:
converted = attribute->ConvertValue(index, reinterpret_cast<int16_t *>(value));
break;
case ComponentType::UnsignedShort:
converted = attribute->ConvertValue(index, reinterpret_cast<uint16_t *>(value));
break;
case ComponentType::UnsignedInt:
converted = attribute->ConvertValue(index, reinterpret_cast<uint32_t *>(value));
break;
case ComponentType::Float:
converted = attribute->ConvertValue(index, reinterpret_cast<float *>(value));
break;
default:
break;
}
if (!converted)
{
printf(LOG_PREFIX "Failed to convert Draco attribute type to glTF accessor type for attribute with id=%" PRIu32 "\n", id);
return false;
}
}
decoder->buffers[id] = decodedData;
return true;
}
size_t decoderGetAttributeByteLength(Decoder *decoder, size_t id)
{
auto iter = decoder->buffers.find(id);
if (iter != decoder->buffers.end())
{
return iter->second.size();
}
else
{
return 0;
}
}
void decoderCopyAttribute(Decoder *decoder, size_t id, void *output)
{
auto iter = decoder->buffers.find(id);
if (iter != decoder->buffers.end())
{
memcpy(output, iter->second.data(), iter->second.size());
}
}
template<class T>
void decodeIndices(Decoder *decoder)
{
std::vector<uint8_t> decodedIndices;
decodedIndices.resize(decoder->indexCount * sizeof(T));
T *typedView = reinterpret_cast<T *>(decodedIndices.data());
for (uint32_t faceIndex = 0; faceIndex < decoder->mesh->num_faces(); ++faceIndex)
{
const draco::Mesh::Face &face = decoder->mesh->face(draco::FaceIndex(faceIndex));
typedView[faceIndex * 3 + 0] = face[0].value();
typedView[faceIndex * 3 + 1] = face[1].value();
typedView[faceIndex * 3 + 2] = face[2].value();
}
decoder->indexBuffer = decodedIndices;
}
bool decoderReadIndices(Decoder *decoder, size_t indexComponentType)
{
switch (indexComponentType)
{
case ComponentType::Byte:
decodeIndices<int8_t>(decoder);
break;
case ComponentType::UnsignedByte:
decodeIndices<uint8_t>(decoder);
break;
case ComponentType::Short:
decodeIndices<int16_t>(decoder);
break;
case ComponentType::UnsignedShort:
decodeIndices<uint16_t>(decoder);
break;
case ComponentType::UnsignedInt:
decodeIndices<uint32_t>(decoder);
break;
default:
printf(LOG_PREFIX "Index component type %zu not supported\n", indexComponentType);
return false;
}
return true;
}
size_t decoderGetIndicesByteLength(Decoder *decoder)
{
return decoder->indexBuffer.size();
}
void decoderCopyIndices(Decoder *decoder, void *output)
{
memcpy(output, decoder->indexBuffer.data(), decoder->indexBuffer.size());
}
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