// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkOpenGLGlyph3DMapper.h"

#include "vtkActor.h"
#include "vtkBitArray.h"
#include "vtkCompositeDataDisplayAttributes.h"
#include "vtkCompositeDataIterator.h"
#include "vtkCompositeDataSet.h"
#include "vtkCompositeDataSetRange.h"
#include "vtkDataObjectTree.h"
#include "vtkDataObjectTreeIterator.h"
#include "vtkDataObjectTreeRange.h"
#include "vtkHardwareSelector.h"
#include "vtkMath.h"
#include "vtkMatrix3x3.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGLGlyph3DHelper.h"
#include "vtkProperty.h"
#include "vtkQuaternion.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkSmartPointer.h"
#include "vtkTransform.h"
#include "vtkUnsignedCharArray.h"

#include <map>

VTK_ABI_NAMESPACE_BEGIN
namespace
{
int getNumberOfChildren(vtkDataObjectTree* tree)
{
  int result = 0;
  if (tree)
  {
    vtkDataObjectTreeIterator* it = tree->NewTreeIterator();
    it->SetTraverseSubTree(false);
    it->SetVisitOnlyLeaves(false);
    for (it->InitTraversal(); !it->IsDoneWithTraversal(); it->GoToNextItem())
    {
      ++result;
    }
    it->Delete();
  }
  return result;
}

vtkDataObject* getChildDataObject(vtkDataObjectTree* tree, int child)
{
  vtkDataObject* result = nullptr;
  if (tree)
  {
    vtkDataObjectTreeIterator* it = tree->NewTreeIterator();
    it->SetTraverseSubTree(false);
    it->SetVisitOnlyLeaves(false);
    it->InitTraversal();
    for (int i = 0; i < child; ++i)
    {
      it->GoToNextItem();
    }
    result = it->GetCurrentDataObject();
    it->Delete();
  }
  return result;
}
}

class vtkOpenGLGlyph3DMappervtkColorMapper : public vtkMapper
{
public:
  vtkTypeMacro(vtkOpenGLGlyph3DMappervtkColorMapper, vtkMapper);
  static vtkOpenGLGlyph3DMappervtkColorMapper* New();
  void Render(vtkRenderer*, vtkActor*) override {}
  vtkUnsignedCharArray* GetColors() { return this->Colors; }
};

vtkStandardNewMacro(vtkOpenGLGlyph3DMappervtkColorMapper);

class vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry
{
public:
  std::vector<vtkIdType> PickIds;
  std::vector<unsigned char> Colors;
  std::vector<float> Matrices;       // transposed
  std::vector<float> NormalMatrices; // transposed
  vtkTimeStamp BuildTime;
  // May be polydata or composite dataset:
  vtkDataObject* DataObject;
  // maps composite dataset flat index to polydatamapper. Key = -1 for polydata
  // DataObject.
  typedef std::map<int, vtkOpenGLGlyph3DHelper*> MapperMap;
  MapperMap Mappers;
  int NumberOfPoints;

  vtkOpenGLGlyph3DMapperEntry()
  {
    this->NumberOfPoints = 0;
    this->DataObject = nullptr;
  }
  ~vtkOpenGLGlyph3DMapperEntry()
  {
    this->ClearMappers();
    if (this->DataObject)
    {
      this->DataObject->Delete();
    }
  }
  void ClearMappers()
  {
    for (MapperMap::iterator it = this->Mappers.begin(); it != this->Mappers.end(); ++it)
    {
      it->second->Delete();
    }
    this->Mappers.clear();
  }
};

class vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray
{
public:
  std::vector<vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry*> Entries;
  vtkTimeStamp BuildTime;
  vtkOpenGLGlyph3DMapperSubArray() = default;
  ~vtkOpenGLGlyph3DMapperSubArray() { this->ClearEntries(); }
  void ClearEntries()
  {
    std::vector<vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry*>::iterator miter =
      this->Entries.begin();
    for (; miter != this->Entries.end(); ++miter)
    {
      delete *miter;
    }
    this->Entries.clear();
  }
};

class vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperArray
{
public:
  std::map<const vtkDataSet*, vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray*> Entries;
  ~vtkOpenGLGlyph3DMapperArray()
  {
    std::map<const vtkDataSet*, vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray*>::iterator
      miter = this->Entries.begin();
    for (; miter != this->Entries.end(); ++miter)
    {
      delete miter->second;
    }
    this->Entries.clear();
  }
};

vtkStandardNewMacro(vtkOpenGLGlyph3DMapper);

//------------------------------------------------------------------------------
// Construct object with scaling on, scaling mode is by scalar value,
// scale factor = 1.0, the range is (0,1), orient geometry is on, and
// orientation is by vector. Clamping and indexing are turned off. No
// initial sources are defined.
vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapper()
{
  this->GlyphValues = new vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperArray();
  this->ColorMapper = vtkOpenGLGlyph3DMappervtkColorMapper::New();
}

//------------------------------------------------------------------------------
vtkOpenGLGlyph3DMapper::~vtkOpenGLGlyph3DMapper()
{
  this->ColorMapper->Delete();

  delete this->GlyphValues;
  this->GlyphValues = nullptr;
}

//------------------------------------------------------------------------------
// Description:
// Send mapper ivars to sub-mapper.
// \pre mapper_exists: mapper!=0
void vtkOpenGLGlyph3DMapper::CopyInformationToSubMapper(vtkOpenGLGlyph3DHelper* mapper)
{
  assert("pre: mapper_exists" && mapper != nullptr);
  mapper->SetStatic(this->Static);
  mapper->ScalarVisibilityOff();
  // not used
  mapper->SetClippingPlanes(this->ClippingPlanes);

  vtkOpenGLGlyph3DHelper::SetResolveCoincidentTopology(
    vtkOpenGLGlyph3DMapper::GetResolveCoincidentTopology());
  vtkOpenGLGlyph3DHelper::SetResolveCoincidentTopologyZShift(
    vtkOpenGLGlyph3DMapper::GetResolveCoincidentTopologyZShift());

  double f, u;
  this->GetRelativeCoincidentTopologyPolygonOffsetParameters(f, u);
  mapper->SetRelativeCoincidentTopologyPolygonOffsetParameters(f, u);
  this->GetRelativeCoincidentTopologyLineOffsetParameters(f, u);
  mapper->SetRelativeCoincidentTopologyLineOffsetParameters(f, u);
  this->GetRelativeCoincidentTopologyPointOffsetParameter(u);
  mapper->SetRelativeCoincidentTopologyPointOffsetParameter(u);

  // ResolveCoincidentTopologyPolygonOffsetParameters is static
  vtkOpenGLGlyph3DHelper::SetResolveCoincidentTopologyPolygonOffsetFaces(
    vtkOpenGLGlyph3DMapper::GetResolveCoincidentTopologyPolygonOffsetFaces());

  if (static_cast<vtkIdType>(this->LODs.size()) > this->GetMaxNumberOfLOD())
  {
    vtkWarningMacro(<< "too many LODs are defined, "
                    << (static_cast<vtkIdType>(this->LODs.size()) - this->GetMaxNumberOfLOD())
                    << " last defined LODs are discarded.");
    this->LODs.resize(this->GetMaxNumberOfLOD());
  }

  mapper->SetLODs(this->LODs);
  mapper->SetLODColoring(this->LODColoring);
}

void vtkOpenGLGlyph3DMapper::SetupColorMapper()
{
  this->ColorMapper->ShallowCopy(this);
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::RenderChildren(
  vtkRenderer* renderer, vtkActor* actor, vtkDataObject* dobj, unsigned int& flatIndex)
{
  // Push overridden attributes onto the stack.
  // Keep track of attributes that were pushed so that they can be popped after they're applied to
  // the batch element.
  vtkCompositeDataDisplayAttributes* cda = this->BlockAttributes;
  bool overrides_visibility = (cda && cda->HasBlockVisibility(dobj));
  if (overrides_visibility)
  {
    this->BlockState.Visibility.push(cda->GetBlockVisibility(dobj));
  }
  bool overrides_pickability = (cda && cda->HasBlockPickability(dobj));
  if (overrides_pickability)
  {
    this->BlockState.Pickability.push(cda->GetBlockPickability(dobj));
  }
  bool overrides_opacity = (cda && cda->HasBlockOpacity(dobj));
  if (overrides_opacity)
  {
    this->BlockState.Opacity.push(cda->GetBlockOpacity(dobj));
  }
  bool overrides_color = (cda && cda->HasBlockColor(dobj));
  if (overrides_color)
  {
    vtkColor3d color = cda->GetBlockColor(dobj);
    this->BlockState.Color.push(color);
  }
  // Advance flat-index. After this point, flatIndex no longer points to this
  // block.
  const auto originalFlatIndex = flatIndex;
  flatIndex++;

  if (auto dObjTree = vtkDataObjectTree::SafeDownCast(dobj))
  {
    using Opts = vtk::DataObjectTreeOptions;
    for (vtkDataObject* child : vtk::Range(dObjTree, Opts::None))
    {
      if (!child)
      {
        ++flatIndex;
      }
      else
      {
        this->RenderChildren(renderer, actor, child, flatIndex);
      }
    }
  }
  else
  {
    auto ds = vtkDataSet::SafeDownCast(dobj);
    // Skip invisible blocks and unpickable ones when performing selection:
    bool blockVis = this->BlockState.Visibility.top();
    bool blockPick = this->BlockState.Pickability.top();
    auto selector = renderer->GetSelector();
    bool skip = (!blockVis || (selector && !blockPick));
    if (!skip)
    {
      if (ds)
      {
        if (selector)
        {
          selector->RenderCompositeIndex(originalFlatIndex);
        }
        actor->GetProperty()->SetColor(this->BlockState.Color.top().GetData());
        actor->GetProperty()->SetOpacity(this->BlockState.Opacity.top());
        this->Render(renderer, actor, ds);
      }
      else
      {
        vtkErrorMacro(<< "Expected a vtkDataObjectTree or vtkDataSet input. Got "
                      << dobj->GetClassName());
      }
    }
  }
  if (overrides_color)
  {
    this->BlockState.Color.pop();
  }
  if (overrides_opacity)
  {
    this->BlockState.Opacity.pop();
  }
  if (overrides_pickability)
  {
    this->BlockState.Pickability.pop();
  }
  if (overrides_visibility)
  {
    this->BlockState.Visibility.pop();
  }
}

//------------------------------------------------------------------------------
// Description:
// Method initiates the mapping process. Generally sent by the actor
// as each frame is rendered.
void vtkOpenGLGlyph3DMapper::Render(vtkRenderer* ren, vtkActor* actor)
{
  vtkOpenGLClearErrorMacro();

  this->SetupColorMapper();

  vtkHardwareSelector* selector = ren->GetSelector();

  if (selector)
  {
    selector->BeginRenderProp();
  }

  vtkDataObject* inputDO = this->GetInputDataObject(0, 0);

  // Check input for consistency
  //
  // Create a default source, if no source is specified.
  if (!this->UseSourceTableTree && this->GetSource(0) == nullptr)
  {
    vtkPolyData* defaultSource = vtkPolyData::New();
    defaultSource->AllocateEstimate(0, 0, 1, 2, 0, 0, 0, 0);
    vtkPoints* defaultPoints = vtkPoints::New();
    defaultPoints->Allocate(6);
    defaultPoints->InsertNextPoint(0., 0., 0.);
    defaultPoints->InsertNextPoint(1., 0., 0.);
    vtkIdType defaultPointIds[2];
    defaultPointIds[0] = 0;
    defaultPointIds[1] = 1;
    defaultSource->SetPoints(defaultPoints);
    defaultSource->InsertNextCell(VTK_LINE, 2, defaultPointIds);
    this->SetSourceData(defaultSource);
    defaultSource->Delete();
    defaultSource = nullptr;
    defaultPoints->Delete();
    defaultPoints = nullptr;
  }

  // Check that source configuration is sane:
  vtkDataObjectTree* sourceTableTree = this->GetSourceTableTree();
  int numSourceDataSets = this->GetNumberOfInputConnections(1);
  if (this->UseSourceTableTree)
  {
    if (numSourceDataSets > 1)
    {
      vtkErrorMacro("UseSourceTableTree is true, but multiple source datasets "
                    "are set.");
      return;
    }
    if (!sourceTableTree)
    {
      vtkErrorMacro("UseSourceTableTree is true, but the source dataset is "
                    "not a vtkDataObjectTree.");
      return;
    }
    vtkDataObjectTreeIterator* it = sourceTableTree->NewTreeIterator();
    it->SetTraverseSubTree(false);
    it->SetVisitOnlyLeaves(false);
    for (it->InitTraversal(); !it->IsDoneWithTraversal(); it->GoToNextItem())
    {
      vtkDataObject* node = it->GetCurrentDataObject();
      if (!node->IsA("vtkPolyData") && !node->IsA("vtkCompositeDataSet"))
      {
        vtkErrorMacro("The source table tree must only contain vtkPolyData "
                      "or vtkCompositeDataSet children, but found a "
          << node->GetClassName() << ".");
        it->Delete();
        return;
      }
    }
    it->Delete();
  }
  else
  {
    for (int i = 0; i < numSourceDataSets; ++i)
    {
      if (!this->GetSource(i))
      {
        vtkErrorMacro("Source input at index " << i
                                               << " not set, or not "
                                                  "vtkPolyData.");
        return;
      }
    }
  }

  // Render the input dataset or every dataset in the input composite dataset.
  this->BlockMTime = this->BlockAttributes ? this->BlockAttributes->GetMTime() : 0;
  vtkDataSet* ds = vtkDataSet::SafeDownCast(inputDO);
  vtkCompositeDataSet* cd = vtkCompositeDataSet::SafeDownCast(inputDO);
  if (ds)
  {
    this->Render(ren, actor, ds);
  }
  else if (cd)
  {
    vtkNew<vtkActor> blockAct;
    vtkNew<vtkProperty> blockProp;
    blockAct->ShallowCopy(actor);
    blockProp->DeepCopy(blockAct->GetProperty());
    blockAct->SetProperty(blockProp.GetPointer());
    double origColor[4];
    blockProp->GetColor(origColor);

    // Push base-values on the state stack.
    this->BlockState.Visibility.push(true);
    this->BlockState.Pickability.push(true);
    this->BlockState.Opacity.push(blockProp->GetOpacity());
    this->BlockState.Color.emplace(origColor);

    unsigned int flatIndex = 0;
    this->RenderChildren(ren, blockAct, cd, flatIndex);

    // Pop base-values from the state stack.
    this->BlockState.Visibility.pop();
    this->BlockState.Pickability.pop();
    this->BlockState.Opacity.pop();
    this->BlockState.Color.pop();
  }

  if (selector)
  {
    selector->EndRenderProp();
  }

  vtkOpenGLCheckErrorMacro("Failed after Render");

  this->UpdateProgress(1.0);
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::Render(vtkRenderer* ren, vtkActor* actor, vtkDataSet* dataset)
{
  vtkIdType numPts = dataset->GetNumberOfPoints();
  if (numPts < 1)
  {
    vtkDebugMacro(<< "No points to glyph!");
    return;
  }

  // make sure we have an entry for this dataset
  vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray* subarray;
  bool rebuild = false;
  typedef std::map<const vtkDataSet*,
    vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray*>::iterator GVIter;
  GVIter found = this->GlyphValues->Entries.find(dataset);
  if (found == this->GlyphValues->Entries.end())
  {
    subarray = new vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray();
    this->GlyphValues->Entries.insert(std::make_pair(dataset, subarray));
    rebuild = true;
  }
  else
  {
    subarray = found->second;
  }

  // make sure we have a subentry for each source
  vtkDataObjectTree* sourceTableTree = this->GetSourceTableTree();
  int sTTSize = getNumberOfChildren(sourceTableTree);
  int numSourceDataSets = this->GetNumberOfInputConnections(1);
  size_t numberOfSources = this->UseSourceTableTree ? sTTSize : numSourceDataSets;
  bool numberOfSourcesChanged = false;
  if (numberOfSources != subarray->Entries.size())
  {
    subarray->ClearEntries();
    for (size_t cc = 0; cc < numberOfSources; cc++)
    {
      subarray->Entries.push_back(new vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry());
    }
    numberOfSourcesChanged = true;
  }

  // make sure sources are up to date
  vtkDataObjectTreeIterator* sTTIter = nullptr;
  if (sourceTableTree)
  {
    sTTIter = sourceTableTree->NewTreeIterator();
    sTTIter->SetTraverseSubTree(false);
    sTTIter->SetVisitOnlyLeaves(false);
    sTTIter->InitTraversal();
  }
  for (size_t cc = 0; cc < subarray->Entries.size(); cc++)
  {
    vtkDataObject* s = this->UseSourceTableTree ? sTTIter->GetCurrentDataObject()
                                                : this->GetSource(static_cast<int>(cc));

    vtkOpenGLGlyph3DMapperEntry* entry = subarray->Entries[cc];
    vtkDataObject* ss = entry->DataObject;
    if (ss && !ss->IsA(s->GetClassName()))
    {
      ss->Delete();
      ss = nullptr;
    }
    if (!ss)
    {
      ss = s->NewInstance();
      entry->DataObject = ss;
    }
    if (numberOfSourcesChanged || s->GetMTime() > ss->GetMTime() ||
      this->GetMTime() > entry->BuildTime)
    {
      ss->ShallowCopy(s);
      entry->ClearMappers();
    }

    // Create/update the helper mappers:
    vtkCompositeDataIterator* cdsIter = nullptr;
    if (vtkCompositeDataSet* cds = vtkCompositeDataSet::SafeDownCast(ss))
    {
      cdsIter = cds->NewIterator();
      cdsIter->InitTraversal();
    }

    for (;;)
    {
      vtkOpenGLGlyph3DHelper* mapper = nullptr;

      int mapperIdx = cdsIter ? static_cast<int>(cdsIter->GetCurrentFlatIndex()) : -1;
      vtkOpenGLGlyph3DMapperEntry::MapperMap::iterator mapIter = entry->Mappers.find(mapperIdx);
      if (mapIter == entry->Mappers.end())
      {
        mapper = vtkOpenGLGlyph3DHelper::New();
        entry->Mappers.insert(std::make_pair(mapperIdx, mapper));
      }
      else
      {
        mapper = mapIter->second;
      }
      this->CopyInformationToSubMapper(mapper);

      if (cdsIter)
      {
        cdsIter->GoToNextItem();
      }

      if (!cdsIter || cdsIter->IsDoneWithTraversal())
      {
        break;
      }
    }

    if (cdsIter)
    {
      cdsIter->Delete();
      cdsIter = nullptr;
    }

    if (sTTIter)
    {
      sTTIter->GoToNextItem();
    }
  }
  if (sTTIter)
  {
    sTTIter->Delete();
    sTTIter = nullptr;
  }

  // rebuild all entries for this DataSet if it
  // has been modified
  if (subarray->BuildTime < dataset->GetMTime() || subarray->BuildTime < this->GetMTime() ||
    subarray->BuildTime < this->BlockMTime)
  {
    rebuild = true;
  }

  // get the mask array
  vtkBitArray* maskArray = nullptr;
  if (this->Masking)
  {
    maskArray = vtkArrayDownCast<vtkBitArray>(this->GetMaskArray(dataset));
    if (maskArray == nullptr)
    {
      vtkDebugMacro(<< "masking is enabled but there is no mask array. Ignore masking.");
    }
    else
    {
      if (maskArray->GetNumberOfComponents() != 1)
      {
        vtkErrorMacro(" expecting a mask array with one component, getting "
          << maskArray->GetNumberOfComponents() << " components.");
        return;
      }
    }
  }

  // rebuild all sources for this dataset
  if (rebuild)
  {
    this->RebuildStructures(subarray, numPts, actor, dataset, maskArray);
  }

  // for each subarray
  for (size_t cc = 0; cc < subarray->Entries.size(); cc++)
  {
    vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry* entry = subarray->Entries[cc];
    if (entry->NumberOfPoints <= 0)
    {
      continue;
    }

    vtkDataObject* dObj = entry->DataObject;
    vtkPolyData* pd = vtkPolyData::SafeDownCast(dObj);
    vtkCompositeDataSet* cds = pd ? nullptr : vtkCompositeDataSet::SafeDownCast(dObj);

    vtkCompositeDataIterator* cdsIter = nullptr;
    if (cds)
    {
      cdsIter = cds->NewIterator();
      cdsIter->InitTraversal();
    }

    // Either render the polydata, or loop through the composite dataset and
    // render each polydata leaf:
    for (;;)
    {
      int mapperIdx = -1;
      if (cdsIter)
      {
        pd = vtkPolyData::SafeDownCast(cdsIter->GetCurrentDataObject());
        mapperIdx = cdsIter->GetCurrentFlatIndex();
        cdsIter->GoToNextItem();
      }

      if (pd && pd->GetNumberOfPoints() > 0)
      {
        vtkOpenGLGlyph3DHelper* gh = entry->Mappers[mapperIdx];
        gh->CurrentInput = pd;
        gh->GlyphRender(ren, actor, entry->NumberOfPoints, entry->Colors, entry->Matrices,
          entry->NormalMatrices, entry->PickIds, subarray->BuildTime, this->CullingAndLOD);
      }

      if (!cdsIter || cdsIter->IsDoneWithTraversal())
      {
        break;
      }
    } // end composite glyph iteration

    if (cdsIter)
    {
      cdsIter->Delete();
      cdsIter = nullptr;
    }
  } // end entries

  vtkOpenGLCheckErrorMacro("failed after Render");
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::RebuildStructures(
  vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray* subarray, vtkIdType numPts,
  vtkActor* actor, vtkDataSet* dataset, vtkBitArray* maskArray)
{
  double den = this->Range[1] - this->Range[0];
  if (den == 0.0)
  {
    den = 1.0;
  }

  unsigned char color[4];
  {
    const double* actorColor = actor->GetProperty()->GetColor();
    for (int i = 0; i != 3; ++i)
    {
      color[i] = static_cast<unsigned char>(actorColor[i] * 255. + 0.5);
    }
    color[3] = static_cast<unsigned char>(actor->GetProperty()->GetOpacity() * 255. + 0.5);
  }

  vtkDataArray* orientArray = this->GetOrientationArray(dataset);
  if (orientArray != nullptr)
  {
    if ((this->OrientationMode == ROTATION || this->OrientationMode == DIRECTION) &&
      orientArray->GetNumberOfComponents() != 3)
    {
      vtkErrorMacro(" expecting an orientation array with 3 components, getting "
        << orientArray->GetNumberOfComponents() << " components.");
      return;
    }
    else if (this->OrientationMode == QUATERNION && orientArray->GetNumberOfComponents() != 4)
    {
      vtkErrorMacro(" expecting an orientation array with 4 components, getting "
        << orientArray->GetNumberOfComponents() << " components.");
      return;
    }
  }

  vtkDataArray* indexArray = this->GetSourceIndexArray(dataset);
  vtkDataArray* scaleArray = this->GetScaleArray(dataset);
  vtkDataArray* selectionArray = this->GetSelectionIdArray(dataset);

  /// FIXME: Didn't handle the premultiplycolorswithalpha aspect...
  this->ColorMapper->SetInputDataObject(dataset);
  this->ColorMapper->MapScalars(actor->GetProperty()->GetOpacity());
  vtkUnsignedCharArray* colors =
    ((vtkOpenGLGlyph3DMappervtkColorMapper*)this->ColorMapper)->GetColors();
  // Traverse all Input points, transforming Source points

  int numEntries = (int)subarray->Entries.size();

  // how many points for each source
  int* numPointsPerSource = new int[numEntries];
  std::fill(numPointsPerSource, numPointsPerSource + numEntries, 0);
  if (numEntries > 1 && indexArray)
  {
    // loop over every point
    int index = 0;
    for (vtkIdType inPtId = 0; inPtId < numPts; inPtId++)
    {
      if (maskArray && maskArray->GetValue(inPtId) == 0)
      {
        continue;
      }

      // Compute index into table of glyphs
      double value =
        vtkMath::Norm(indexArray->GetTuple(inPtId), indexArray->GetNumberOfComponents());
      index = static_cast<int>(value);
      index = vtkMath::ClampValue(index, 0, numEntries - 1);
      numPointsPerSource[index]++;
    }
  }
  else
  {
    numPointsPerSource[0] = numPts;
  }

  // for each entry start with a reasonable allocation
  for (size_t cc = 0; cc < subarray->Entries.size(); cc++)
  {
    vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry* entry = subarray->Entries[cc];
    entry->PickIds.resize(numPointsPerSource[cc]);
    entry->Colors.resize(numPointsPerSource[cc] * 4);
    entry->Matrices.resize(numPointsPerSource[cc] * 16);
    entry->NormalMatrices.resize(numPointsPerSource[cc] * 9);
    entry->NumberOfPoints = 0;
    entry->BuildTime.Modified();
  }
  delete[] numPointsPerSource;

  // loop over every point and fill structures
  int index = 0;
  vtkDataObjectTree* sourceTableTree = this->GetSourceTableTree();

  // cache sources to improve performances
  std::vector<vtkDataObject*> sourceCache(numEntries);
  for (vtkIdType i = 0; i < numEntries; i++)
  {
    sourceCache[i] =
      this->UseSourceTableTree ? getChildDataObject(sourceTableTree, i) : this->GetSource(i);
  }

  double trans[16];
  double normalTrans[9];

  for (vtkIdType inPtId = 0; inPtId < numPts; inPtId++)
  {
    if (!(inPtId % 10000))
    {
      this->UpdateProgress(static_cast<double>(inPtId) / static_cast<double>(numPts));
      if (this->GetAbortExecute())
      {
        break;
      }
    }

    if (maskArray && maskArray->GetValue(inPtId) == 0)
    {
      continue;
    }

    // Compute index into table of glyphs
    if (indexArray)
    {
      double value =
        vtkMath::Norm(indexArray->GetTuple(inPtId), indexArray->GetNumberOfComponents());
      index = static_cast<int>(value);
      index = vtkMath::ClampValue(index, 0, numEntries - 1);
    }

    // source can be null.
    vtkDataObject* source =
      index < static_cast<int>(sourceCache.size()) ? sourceCache[index] : nullptr;

    // Make sure we're not indexing into empty glyph
    if (source)
    {
      vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry* entry = subarray->Entries[index];

      entry->Colors[entry->NumberOfPoints * 4] = color[0];
      entry->Colors[entry->NumberOfPoints * 4 + 1] = color[1];
      entry->Colors[entry->NumberOfPoints * 4 + 2] = color[2];
      entry->Colors[entry->NumberOfPoints * 4 + 3] = color[3];

      double scalex = 1.0;
      double scaley = 1.0;
      double scalez = 1.0;
      // Get the scalar and vector data
      if (scaleArray)
      {
        double* tuple = scaleArray->GetTuple(inPtId);
        switch (this->ScaleMode)
        {
          case SCALE_BY_MAGNITUDE:
            scalex = scaley = scalez = vtkMath::Norm(tuple, scaleArray->GetNumberOfComponents());
            break;
          case SCALE_BY_COMPONENTS:
            if (scaleArray->GetNumberOfComponents() != 3)
            {
              vtkErrorMacro("Cannot scale by components since " << scaleArray->GetName()
                                                                << " does not have 3 components.");
            }
            else
            {
              scalex = tuple[0];
              scaley = tuple[1];
              scalez = tuple[2];
            }
            break;
          case NO_DATA_SCALING:
          default:
            break;
        }

        // Clamp data scale if enabled
        if (this->Clamping && this->ScaleMode != NO_DATA_SCALING)
        {
          scalex = (scalex < this->Range[0] ? this->Range[0]
                                            : (scalex > this->Range[1] ? this->Range[1] : scalex));
          scalex = (scalex - this->Range[0]) / den;
          scaley = (scaley < this->Range[0] ? this->Range[0]
                                            : (scaley > this->Range[1] ? this->Range[1] : scaley));
          scaley = (scaley - this->Range[0]) / den;
          scalez = (scalez < this->Range[0] ? this->Range[0]
                                            : (scalez > this->Range[1] ? this->Range[1] : scalez));
          scalez = (scalez - this->Range[0]) / den;
        }
      }
      scalex *= this->ScaleFactor;
      scaley *= this->ScaleFactor;
      scalez *= this->ScaleFactor;

      // Now begin copying/transforming glyph
      vtkMatrix4x4::Identity(trans);
      vtkMatrix3x3::Identity(normalTrans);

      // translate Source to Input point
      double x[3];
      dataset->GetPoint(inPtId, x);
      trans[3] = x[0];
      trans[7] = x[1];
      trans[11] = x[2];

      if (orientArray)
      {
        double orientation[4];
        orientArray->GetTuple(inPtId, orientation);

        double rotMatrix[3][3];
        vtkQuaterniond quaternion;

        switch (this->OrientationMode)
        {
          case ROTATION:
          {
            double angle = vtkMath::RadiansFromDegrees(orientation[2]);
            vtkQuaterniond qz(cos(0.5 * angle), 0.0, 0.0, sin(0.5 * angle));

            angle = vtkMath::RadiansFromDegrees(orientation[0]);
            vtkQuaterniond qx(cos(0.5 * angle), sin(0.5 * angle), 0.0, 0.0);

            angle = vtkMath::RadiansFromDegrees(orientation[1]);
            vtkQuaterniond qy(cos(0.5 * angle), 0.0, sin(0.5 * angle), 0.0);

            quaternion = qz * qx * qy;
          }
          break;

          case DIRECTION:
            if (orientation[1] == 0.0 && orientation[2] == 0.0)
            {
              if (orientation[0] < 0) // just flip x if we need to
              {
                quaternion.Set(0.0, 0.0, 1.0, 0.0);
              }
            }
            else
            {
              double vMag = vtkMath::Norm(orientation);
              double vNew[3];
              vNew[0] = (orientation[0] + vMag) / 2.0;
              vNew[1] = orientation[1] / 2.0;
              vNew[2] = orientation[2] / 2.0;

              double f = 1.0 / sqrt(vNew[0] * vNew[0] + vNew[1] * vNew[1] + vNew[2] * vNew[2]);
              vNew[0] *= f;
              vNew[1] *= f;
              vNew[2] *= f;

              quaternion.Set(0.0, vNew[0], vNew[1], vNew[2]);
            }
            break;

          case QUATERNION:
            quaternion.Set(orientation);
            break;
        }

        quaternion.ToMatrix3x3(rotMatrix);

        for (int i = 0; i < 3; i++)
        {
          for (int j = 0; j < 3; j++)
          {
            trans[4 * i + j] = rotMatrix[i][j];
            normalTrans[3 * i + j] = rotMatrix[j][i]; // transpose
          }
        }
      }

      // Set pickid
      // Use selectionArray value or glyph point ID.
      vtkIdType selectionId = inPtId;
      if (this->UseSelectionIds)
      {
        if (selectionArray == nullptr || selectionArray->GetNumberOfTuples() == 0)
        {
          vtkWarningMacro(<< "UseSelectionIds is true, but selection array"
                             " is invalid. Ignoring selection array.");
        }
        else
        {
          selectionId = static_cast<vtkIdType>(*selectionArray->GetTuple(inPtId));
        }
      }
      entry->PickIds[entry->NumberOfPoints] = selectionId;

      if (colors)
      {
        colors->GetTypedTuple(inPtId, &(entry->Colors[entry->NumberOfPoints * 4]));
      }

      // scale data if appropriate
      if (this->Scaling)
      {
        if (scalex == 0.0)
        {
          scalex = 1.0e-10;
        }
        if (scaley == 0.0)
        {
          scaley = 1.0e-10;
        }
        if (scalez == 0.0)
        {
          scalez = 1.0e-10;
        }

        for (int i = 0; i < 3; i++)
        {
          // inverse of normal matrix is directly computed with inverse scale
          trans[4 * i] *= scalex;
          normalTrans[i] /= scalex;
          trans[4 * i + 1] *= scaley;
          normalTrans[i + 3] /= scaley;
          trans[4 * i + 2] *= scalez;
          normalTrans[i + 6] /= scalez;
        }
      }

      float* matrices = &entry->Matrices[entry->NumberOfPoints * 16];
      float* normalMatrices = &entry->NormalMatrices[entry->NumberOfPoints * 9];

      for (int i = 0; i < 4; i++)
      {
        for (int j = 0; j < 4; j++)
        {
          matrices[i * 4 + j] = trans[j * 4 + i];
        }
      }

      for (int i = 0; i < 3; i++)
      {
        for (int j = 0; j < 3; j++)
        {
          normalMatrices[i * 3 + j] = normalTrans[i * 3 + j];
        }
      }
      entry->NumberOfPoints++;
    }
  }

  subarray->BuildTime.Modified();
}

//------------------------------------------------------------------------------
// Description:
// Release any graphics resources that are being consumed by this mapper.
void vtkOpenGLGlyph3DMapper::ReleaseGraphicsResources(vtkWindow* window)
{
  if (this->GlyphValues)
  {
    std::map<const vtkDataSet*, vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperSubArray*>::iterator
      miter = this->GlyphValues->Entries.begin();
    for (; miter != this->GlyphValues->Entries.end(); ++miter)
    {
      std::vector<vtkOpenGLGlyph3DMapper::vtkOpenGLGlyph3DMapperEntry*>::iterator miter2 =
        miter->second->Entries.begin();
      for (; miter2 != miter->second->Entries.end(); ++miter2)
      {
        vtkOpenGLGlyph3DMapperEntry::MapperMap::iterator miter3 = (*miter2)->Mappers.begin();
        for (; miter3 != (*miter2)->Mappers.end(); ++miter3)
        {
          miter3->second->ReleaseGraphicsResources(window);
        }
      }
    }
  }
}

//------------------------------------------------------------------------------
vtkIdType vtkOpenGLGlyph3DMapper::GetMaxNumberOfLOD()
{
#ifndef GL_ES_VERSION_3_0
  if (!GLEW_ARB_gpu_shader5 || !GLEW_ARB_transform_feedback3)
  {
    return 0;
  }

  GLint streams, maxsize;
  glGetIntegerv(GL_MAX_VERTEX_STREAMS, &streams);
  glGetIntegerv(GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS, &maxsize);
  maxsize /=
    32; // each stream size can be 29 bytes (16 for transform matrix, 9 for normal, 4 for color)

  vtkIdType maxstreams = static_cast<vtkIdType>(std::min(streams, maxsize));
  return maxstreams - 1;
#else
  return 0;
#endif
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::SetNumberOfLOD(vtkIdType nb)
{
  this->LODs.resize(nb, { 0.f, 0.f });
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::SetLODDistanceAndTargetReduction(
  vtkIdType index, float distance, float targetReduction)
{
  if (index < static_cast<vtkIdType>(this->LODs.size()))
  {
    this->LODs[index] = { vtkMath::Max(0.f, distance),
      vtkMath::ClampValue(targetReduction, 0.f, 1.f) };
  }
}

//------------------------------------------------------------------------------
void vtkOpenGLGlyph3DMapper::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
