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sparce accessor exporter

pull/3227/head
Yingying Wang 2020-05-15 12:20:31 -07:00
parent 578dc09810
commit f6720271cb
4 changed files with 346 additions and 12 deletions
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24
code/AssetLib/glTF2/glTF2Asset.h
View File

@ -367,6 +367,7 @@ struct Object {
//! An accessor provides a typed view into a BufferView or a subset of a BufferView
//! similar to how WebGL's vertexAttribPointer() defines an attribute in a buffer.
struct Accessor : public Object {
struct Sparse; //wangyi 0506
Ref<BufferView> bufferView; //!< The ID of the bufferView. (required)
size_t byteOffset; //!< The offset relative to the start of the bufferView in bytes. (required)
ComponentType componentType; //!< The datatype of components in the attribute. (required)
@ -374,6 +375,7 @@ struct Accessor : public Object {
AttribType::Value type; //!< Specifies if the attribute is a scalar, vector, or matrix. (required)
std::vector<double> max; //!< Maximum value of each component in this attribute.
std::vector<double> min; //!< Minimum value of each component in this attribute.
std::unique_ptr<Sparse> sparse; //wangyi 0506
unsigned int GetNumComponents();
unsigned int GetBytesPerComponent();
@ -385,6 +387,10 @@ struct Accessor : public Object {
void ExtractData(T *&outData);
void WriteData(size_t count, const void *src_buffer, size_t src_stride);
//wangyi 0506
void WriteSparseValues(size_t count, const void *src_data, size_t src_dataStride);
void WriteSparseIndices(size_t count, const void *src_idx, size_t src_idxStride);
//! Helper class to iterate the data
class Indexer {
@ -423,6 +429,22 @@ struct Accessor : public Object {
Accessor() {}
void Read(Value &obj, Asset &r);
//wangyi 0506
//sparse
struct Sparse {
size_t count;
ComponentType indicesType;
Ref<BufferView> indices;
size_t indicesByteOffset;
Ref<BufferView> values;
size_t valuesByteOffset;
std::vector<uint8_t> data; //!< Actual data, which may be defaulted to an array of zeros or the original data, with the sparse buffer view applied on top of it.
void PopulateData(size_t numBytes, uint8_t *bytes);
void PatchData(unsigned int elementSize);
};
};
//! A buffer points to binary geometry, animation, or skins.
@ -555,6 +577,8 @@ struct BufferView : public Object {
BufferViewTarget target; //! The target that the WebGL buffer should be bound to.
void Read(Value &obj, Asset &r);
//wangyi 0506
uint8_t *GetPointer(size_t accOffset);
};
struct Camera : public Object {

130
code/AssetLib/glTF2/glTF2Asset.inl
View File

@ -550,10 +550,67 @@ inline void BufferView::Read(Value &obj, Asset &r) {
byteStride = MemberOrDefault(obj, "byteStride", 0u);
}
//wangyi 0506
inline uint8_t *BufferView::GetPointer(size_t accOffset) {
if (!buffer) return 0;
uint8_t *basePtr = buffer->GetPointer();
if (!basePtr) return 0;
size_t offset = accOffset + byteOffset;
if (buffer->EncodedRegion_Current != nullptr) {
const size_t begin = buffer->EncodedRegion_Current->Offset;
const size_t end = begin + buffer->EncodedRegion_Current->DecodedData_Length;
if ((offset >= begin) && (offset < end))
return &buffer->EncodedRegion_Current->DecodedData[offset - begin];
}
return basePtr + offset;
}
//
// struct Accessor
//
//wangyi 0506
inline void Accessor::Sparse::PopulateData(size_t numBytes, uint8_t *bytes) {
if (bytes) {
data.assign(bytes, bytes + numBytes);
} else {
data.resize(numBytes, 0x00);
}
}
inline void Accessor::Sparse::PatchData(unsigned int elementSize) {
uint8_t *pIndices = indices->GetPointer(indicesByteOffset);
const unsigned int indexSize = int(ComponentTypeSize(indicesType));
uint8_t *indicesEnd = pIndices + count * indexSize;
uint8_t *pValues = values->GetPointer(valuesByteOffset);
while (pIndices != indicesEnd) {
size_t offset;
switch (indicesType) {
case ComponentType_UNSIGNED_BYTE:
offset = *pIndices;
break;
case ComponentType_UNSIGNED_SHORT:
offset = *reinterpret_cast<uint16_t *>(pIndices);
break;
case ComponentType_UNSIGNED_INT:
offset = *reinterpret_cast<uint32_t *>(pIndices);
break;
default:
// have fun with float and negative values from signed types as indices.
throw DeadlyImportError("Unsupported component type in index.");
}
offset *= elementSize;
std::memcpy(data.data() + offset, pValues, elementSize);
pValues += elementSize;
pIndices += indexSize;
}
}
// wangyi 0506
inline void Accessor::Read(Value &obj, Asset &r) {
if (Value *bufferViewVal = FindUInt(obj, "bufferView")) {
@ -566,6 +623,43 @@ inline void Accessor::Read(Value &obj, Asset &r) {
const char *typestr;
type = ReadMember(obj, "type", typestr) ? AttribType::FromString(typestr) : AttribType::SCALAR;
//wangyi 0506
if (Value *sparseValue = FindObject(obj, "sparse")) {
sparse.reset(new Sparse);
// count
ReadMember(*sparseValue, "count", sparse->count);
// indices
if (Value *indicesValue = FindObject(*sparseValue, "indices")) {
//indices bufferView
Value *indiceViewID = FindUInt(*indicesValue, "bufferView");
sparse->indices = r.bufferViews.Retrieve(indiceViewID->GetUint());
//indices byteOffset
sparse->indicesByteOffset = MemberOrDefault(*indicesValue, "byteOffset", size_t(0));
//indices componentType
sparse->indicesType = MemberOrDefault(*indicesValue, "componentType", ComponentType_BYTE);
//sparse->indices->Read(*indicesValue, r);
}
// value
if (Value *valuesValue = FindObject(*sparseValue, "values")) {
//value bufferView
Value *valueViewID = FindUInt(*valuesValue, "bufferView");
sparse->values = r.bufferViews.Retrieve(valueViewID->GetUint());
//value byteOffset
sparse->valuesByteOffset = MemberOrDefault(*valuesValue, "byteOffset", size_t(0));
//sparse->values->Read(*valuesValue, r);
}
// indicesType
sparse->indicesType = MemberOrDefault(*sparseValue, "componentType", ComponentType_UNSIGNED_SHORT);
const unsigned int elementSize = GetElementSize();
const size_t dataSize = count * elementSize;
sparse->PopulateData(dataSize, bufferView ? bufferView->GetPointer(byteOffset) : 0);
sparse->PatchData(elementSize);
}
}
inline unsigned int Accessor::GetNumComponents() {
@ -580,7 +674,11 @@ inline unsigned int Accessor::GetElementSize() {
return GetNumComponents() * GetBytesPerComponent();
}
// wangyi 0506
inline uint8_t *Accessor::GetPointer() {
if (sparse)
return sparse->data.data();
if (!bufferView || !bufferView->buffer) return 0;
uint8_t *basePtr = bufferView->buffer->GetPointer();
if (!basePtr) return 0;
@ -635,7 +733,8 @@ void Accessor::ExtractData(T *&outData)
const size_t targetElemSize = sizeof(T);
ai_assert(elemSize <= targetElemSize);
ai_assert(count * stride <= bufferView->byteLength);
//wangyi 0506
ai_assert(count * stride <= (bufferView ? bufferView->byteLength : sparse->data.size()));
outData = new T[count];
if (stride == elemSize && targetElemSize == elemSize) {
@ -660,6 +759,35 @@ inline void Accessor::WriteData(size_t _count, const void *src_buffer, size_t sr
CopyData(_count, src, src_stride, dst, dst_stride);
}
//wangyi 0506
inline void Accessor::WriteSparseValues(size_t _count, const void *src_data, size_t src_dataStride) {
if (!sparse)
return;
// values
uint8_t *value_buffer_ptr = sparse->values->buffer->GetPointer();
size_t value_offset = sparse->valuesByteOffset + sparse->values->byteOffset;
size_t value_dst_stride = GetNumComponents() * GetBytesPerComponent();
const uint8_t *value_src = reinterpret_cast<const uint8_t *>(src_data);
uint8_t *value_dst = reinterpret_cast<uint8_t *>(value_buffer_ptr + value_offset);
ai_assert(value_dst + _count * value_dst_stride <= value_buffer_ptr + sparse->values->buffer->byteLength);
CopyData(_count, value_src, src_dataStride, value_dst, value_dst_stride);
}
//wangyi 0506
inline void Accessor::WriteSparseIndices(size_t _count, const void *src_idx, size_t src_idxStride) {
if (!sparse)
return;
// indices
uint8_t *indices_buffer_ptr = sparse->indices->buffer->GetPointer();
size_t indices_offset = sparse->indicesByteOffset + sparse->indices->byteOffset;
size_t indices_dst_stride = 1 * sizeof(unsigned short);
const uint8_t *indices_src = reinterpret_cast<const uint8_t *>(src_idx);
uint8_t *indices_dst = reinterpret_cast<uint8_t *>(indices_buffer_ptr + indices_offset);
ai_assert(indices_dst + _count * indices_dst_stride <= indices_buffer_ptr + sparse->indices->buffer->byteLength);
CopyData(_count, indices_src, src_idxStride, indices_dst, indices_dst_stride);
}
inline Accessor::Indexer::Indexer(Accessor &acc) :
accessor(acc), data(acc.GetPointer()), elemSize(acc.GetElementSize()), stride(acc.bufferView && acc.bufferView->byteStride ? acc.bufferView->byteStride : elemSize) {
}

38
code/AssetLib/glTF2/glTF2AssetWriter.inl
View File

@ -107,13 +107,10 @@ namespace glTF2 {
inline void Write(Value& obj, Accessor& a, AssetWriter& w)
{
//wangyi 0506
if (a.bufferView) {
obj.AddMember("bufferView", a.bufferView->index, w.mAl);
obj.AddMember("byteOffset", (unsigned int)a.byteOffset, w.mAl);
obj.AddMember("componentType", int(a.componentType), w.mAl);
obj.AddMember("count", (unsigned int)a.count, w.mAl);
obj.AddMember("type", StringRef(AttribType::ToString(a.type)), w.mAl);
Value vTmpMax, vTmpMin;
if (a.componentType == ComponentType_FLOAT) {
obj.AddMember("max", MakeValue(vTmpMax, a.max, w.mAl), w.mAl);
@ -124,6 +121,37 @@ namespace glTF2 {
}
}
obj.AddMember("componentType", int(a.componentType), w.mAl);
obj.AddMember("count", (unsigned int)a.count, w.mAl);
obj.AddMember("type", StringRef(AttribType::ToString(a.type)), w.mAl);
// wangyi 0506
if (a.sparse) {
Value sparseValue;
sparseValue.SetObject();
//count
sparseValue.AddMember("count", (unsigned int)a.sparse->count, w.mAl);
//indices
Value indices;
indices.SetObject();
indices.AddMember("bufferView", a.sparse->indices->index, w.mAl);
indices.AddMember("byteOffset", (unsigned int)a.sparse->indicesByteOffset, w.mAl);
indices.AddMember("componentType", int(a.sparse->indicesType), w.mAl);
sparseValue.AddMember("indices", indices, w.mAl);
//values
Value values;
values.SetObject();
values.AddMember("bufferView", a.sparse->values->index, w.mAl);
values.AddMember("byteOffset", (unsigned int)a.sparse->valuesByteOffset, w.mAl);
sparseValue.AddMember("values", values, w.mAl);
obj.AddMember("sparse", sparseValue, w.mAl);
}
}
inline void Write(Value& obj, Animation& a, AssetWriter& w)
{
/****************** Channels *******************/

156
code/AssetLib/glTF2/glTF2Exporter.cpp
View File

@ -207,6 +207,152 @@ inline void SetAccessorRange(ComponentType compType, Ref<Accessor> acc, void* da
}
}
// wangyi 0506
// compute the (data-dataBase), store the non-zero data items
template <typename T>
size_t NZDiff(void *data, void *dataBase, size_t count, unsigned int numCompsIn, unsigned int numCompsOut, void *&outputNZDiff, void *&outputNZIdx) {
std::vector<T> vNZDiff;
std::vector<unsigned short> vNZIdx;
size_t totalComps = count * numCompsIn;
T *bufferData_ptr = static_cast<T *>(data);
T *bufferData_end = bufferData_ptr + totalComps;
T *bufferBase_ptr = static_cast<T *>(dataBase);
// Search and set extreme values.
for (short idx = 0; bufferData_ptr < bufferData_end; idx += 1, bufferData_ptr += numCompsIn) {
bool bNonZero = false;
//for the data, check any component Non Zero
for (unsigned int j = 0; j < numCompsOut; j++) {
double valueData = bufferData_ptr[j];
double valueBase = bufferBase_ptr ? bufferBase_ptr[j] : 0;
if ((valueData - valueBase) != 0) {
bNonZero = true;
break;
}
}
//all zeros, continue
if (!bNonZero)
continue;
//non zero, store the data
for (unsigned int j = 0; j < numCompsOut; j++) {
T valueData = bufferData_ptr[j];
T valueBase = bufferBase_ptr ? bufferBase_ptr[j] : 0;
vNZDiff.push_back(valueData - valueBase);
}
vNZIdx.push_back(idx);
}
//process data
outputNZDiff = new T[vNZDiff.size()];
memcpy(outputNZDiff, vNZDiff.data(), vNZDiff.size() * sizeof(T));
outputNZIdx = new unsigned short[vNZIdx.size()];
memcpy(outputNZIdx, vNZIdx.data(), vNZIdx.size() * sizeof(unsigned short));
return vNZIdx.size();
}
inline size_t NZDiff(ComponentType compType, void *data, void *dataBase, size_t count, unsigned int numCompsIn, unsigned int numCompsOut, void *&nzDiff, void *&nzIdx) {
switch (compType) {
case ComponentType_SHORT:
return NZDiff<short>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
case ComponentType_UNSIGNED_SHORT:
return NZDiff<unsigned short>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
case ComponentType_UNSIGNED_INT:
return NZDiff<unsigned int>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
case ComponentType_FLOAT:
return NZDiff<float>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
case ComponentType_BYTE:
return NZDiff<int8_t>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
case ComponentType_UNSIGNED_BYTE:
return NZDiff<uint8_t>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
}
return 0;
}
// wangyi 0506
inline Ref<Accessor> ExportDataSparse(Asset &a, std::string &meshName, Ref<Buffer> &buffer,
size_t count, void *data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE, void *dataBase = 0) {
if (!count || !data) {
return Ref<Accessor>();
}
unsigned int numCompsIn = AttribType::GetNumComponents(typeIn);
unsigned int numCompsOut = AttribType::GetNumComponents(typeOut);
unsigned int bytesPerComp = ComponentTypeSize(compType);
// accessor
Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
// if there is a basic data vector
if (dataBase) {
size_t base_offset = buffer->byteLength;
size_t base_padding = base_offset % bytesPerComp;
base_offset += base_padding;
size_t base_length = count * numCompsOut * bytesPerComp;
buffer->Grow(base_length + base_padding);
Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
bv->buffer = buffer;
bv->byteOffset = base_offset;
bv->byteLength = base_length; //! The target that the WebGL buffer should be bound to.
bv->byteStride = 0;
bv->target = target;
acc->bufferView = bv;
acc->WriteData(count, dataBase, numCompsIn * bytesPerComp);
}
acc->byteOffset = 0;
acc->componentType = compType;
acc->count = count;
acc->type = typeOut;
if (data) {
void *nzDiff = 0, *nzIdx = 0;
size_t nzCount = NZDiff(compType, data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
acc->sparse.reset(new Accessor::Sparse);
acc->sparse->count = nzCount;
//indices
unsigned int bytesPerIdx = sizeof(unsigned short);
size_t indices_offset = buffer->byteLength;
size_t indices_padding = indices_offset % bytesPerIdx;
indices_offset += indices_padding;
size_t indices_length = nzCount * 1 * bytesPerIdx;
buffer->Grow(indices_length + indices_padding);
Ref<BufferView> indicesBV = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
indicesBV->buffer = buffer;
indicesBV->byteOffset = indices_offset;
indicesBV->byteLength = indices_length;
indicesBV->byteStride = 0;
acc->sparse->indices = indicesBV;
acc->sparse->indicesType = ComponentType_UNSIGNED_SHORT;
acc->sparse->indicesByteOffset = 0;
acc->WriteSparseIndices(nzCount, nzIdx, 1 * bytesPerIdx);
//values
size_t values_offset = buffer->byteLength;
size_t values_padding = values_offset % bytesPerComp;
values_offset += values_padding;
size_t values_length = nzCount * numCompsOut * bytesPerComp;
buffer->Grow(values_length + values_padding);
Ref<BufferView> valuesBV = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
valuesBV->buffer = buffer;
valuesBV->byteOffset = values_offset;
valuesBV->byteLength = values_length;
valuesBV->byteStride = 0;
acc->sparse->values = valuesBV;
acc->sparse->valuesByteOffset = 0;
acc->WriteSparseValues(nzCount, nzDiff, numCompsIn * bytesPerComp);
//clear
delete[] nzDiff;
delete[] nzIdx;
}
return acc;
}
inline Ref<Accessor> ExportData(Asset& a, std::string& meshName, Ref<Buffer>& buffer,
size_t count, void* data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE)
{
@ -828,7 +974,11 @@ void glTF2Exporter::ExportMeshes()
for (unsigned int vt = 0; vt < pAnimMesh->mNumVertices; ++vt) {
pPositionDiff[vt] = pAnimMesh->mVertices[vt] - aim->mVertices[vt];
}
Ref<Accessor> vec = ExportData(*mAsset, meshId, b,
/*Ref<Accessor> vec = ExportData(*mAsset, meshId, b,
pAnimMesh->mNumVertices, pPositionDiff,
AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);*/
//wangyi 0506
Ref<Accessor> vec = ExportDataSparse(*mAsset, meshId, b,
pAnimMesh->mNumVertices, pPositionDiff,
AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
if (vec) {
@ -843,6 +993,10 @@ void glTF2Exporter::ExportMeshes()
for (unsigned int vt = 0; vt < pAnimMesh->mNumVertices; ++vt) {
pNormalDiff[vt] = pAnimMesh->mNormals[vt] - aim->mNormals[vt];
}
/*Ref<Accessor> vec = ExportData(*mAsset, meshId, b,
pAnimMesh->mNumVertices, pNormalDiff,
AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);*/
//wangyi 0506
Ref<Accessor> vec = ExportData(*mAsset, meshId, b,
pAnimMesh->mNumVertices, pNormalDiff,
AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);