Method ActivateTransferFunction

Rendering/VolumeOpenGL2/vtkVolumeInputHelper.cxx:267–305

}

void vtkVolumeInputHelper::ActivateTransferFunction(vtkShaderProgram* prog, int blendMode)
{
  int const transferMode = this->Volume->GetProperty()->GetTransferFunctionMode();
  int const numActiveLuts =
    this->ComponentMode == INDEPENDENT ? Texture->GetLoadedScalars()->GetNumberOfComponents() : 1;
  switch (transferMode)
  {
    case vtkVolumeProperty::TF_1D:
      for (int i = 0; i < numActiveLuts; ++i)
      {
        this->OpacityTables->GetTable(i)->Activate();
        prog->SetUniformi(
          this->OpacityTablesMap[i].c_str(), this->OpacityTables->GetTable(i)->GetTextureUnit());

        if (blendMode != vtkGPUVolumeRayCastMapper::ADDITIVE_BLEND)
        {
          this->RGBTables->GetTable(i)->Activate();
          prog->SetUniformi(
            this->RGBTablesMap[i].c_str(), this->RGBTables->GetTable(i)->GetTextureUnit());
        }

        if (this->GradientOpacityTables)
        {
          this->GradientOpacityTables->GetTable(i)->Activate();
          prog->SetUniformi(this->GradientOpacityTablesMap[i].c_str(),
            this->GradientOpacityTables->GetTable(i)->GetTextureUnit());
        }
      }
      break;
    case vtkVolumeProperty::TF_2D:
      for (int i = 0; i < numActiveLuts; ++i)
      {
        vtkOpenGLVolumeTransferFunction2D* table = this->TransferFunctions2D->GetTable(i);
        table->Activate();
        prog->SetUniformi(this->TransferFunctions2DMap[i].c_str(), table->GetTextureUnit());
      }
      break;
  }
}

void vtkVolumeInputHelper::DeactivateTransferFunction(int blendMode)
{