Method LoadMask

Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx:671–711

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//------------------------------------------------------------------------------
bool vtkOpenGLGPUVolumeRayCastMapper::vtkInternal::LoadMask(vtkRenderer* ren, vtkVolume* vol)
{
  bool result = true;
  auto maskInput = this->Parent->MaskInput;
  if (maskInput)
  {
    if (!this->CurrentMask)
    {
      this->CurrentMask = vtkSmartPointer<vtkVolumeTexture>::New();

      const auto part = this->Partitions;
      this->CurrentMask->SetPartitions(part[0], part[1], part[2]);
    }

    int isCellData;
    vtkDataArray* arr =
      vtkOpenGLGPUVolumeRayCastMapper::GetScalars(maskInput, this->Parent->ScalarMode,
        this->Parent->ArrayAccessMode, this->Parent->ArrayId, this->Parent->ArrayName, isCellData);
    if (maskInput->GetMTime() > this->MaskUpdateTime ||
      this->CurrentMask->GetLoadedScalars() != arr ||
      (arr && arr->GetMTime() > this->MaskUpdateTime))
    {
      // Setup the scalar range of the mask volume based on the number of transfer functions in the
      // property. This is done so that the value for texture lookup in the shader is scaled and
      // biased based on the range of the texture created by the label transfer functions.
      vtkVolumeProperty* volumeProperty = vol->GetProperty();
      auto const numLabels = volumeProperty->GetLabelMapLabels().size();
      double maskRange[2] = { 0.0, (numLabels > 0.0 ? numLabels : 1.0) };
      vtkNew<vtkInformationVector> infoVec;
      infoVec->SetNumberOfInformationObjects(1);
      infoVec->GetInformationObject(0)->Set(vtkDataArray::COMPONENT_RANGE(), maskRange, 2);
      arr->GetInformation()->Set(vtkDataArray::PER_FINITE_COMPONENT(), infoVec);
      result =
        this->CurrentMask->LoadVolume(ren, maskInput, arr, isCellData, VTK_NEAREST_INTERPOLATION);

      this->MaskUpdateTime.Modified();
    }
  }

  return result;
}

//------------------------------------------------------------------------------
void vtkOpenGLGPUVolumeRayCastMapper::vtkInternal::ReleaseGraphicsMaskTransfer(vtkWindow* window)