Method Upload

Rendering/OpenGL2/vtkOpenGLArrayTextureBufferAdapter.cxx:39–158

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkOpenGLArrayTextureBufferAdapter::Upload(vtkOpenGLRenderWindow* renderWindow, bool force)
{
  if ((this->Buffer && this->Buffer->IsReady()) && !force)
  {
    // We don't need to re-upload.
    return;
  }
  if (this->Arrays.empty())
  {
    // There are no arrays to upload.
    return;
  }
  if (this->Buffer == nullptr)
  {
    // We need to create the buffer.
    this->Buffer = vtkSmartPointer<vtkOpenGLBufferObject>::New();
    this->Buffer->SetType(this->BufferType);
  }
  if (this->Texture == nullptr)
  {
    // We need to create the texture.
    this->Texture = vtkSmartPointer<vtkTextureObject>::New();
    this->Texture->SetRequireTextureInteger(this->IntegerTexture);
    this->Texture->SetContext(renderWindow);
  }
  std::size_t nbytes = 0;
  vtkIdType numberOfTuples = 0;
  int numberOfComponents = 0;
  int vtktype = 0;
  std::vector<vtkSmartPointer<vtkDataArray>> arraysToUpload;
  // 1. Prepare a list of arrays to upload, also figuring out the size of the huge buffer
  // allocation.
  for (auto& actualArray : this->Arrays)
  {
    auto array = actualArray;
    // Narrow arrays of large values to a precision supported by base-OpenGL:
    switch (array->GetDataType())
    {
      case VTK_DOUBLE:
      {
        array = vtkSmartPointer<vtkFloatArray>::New();
        array->DeepCopy(actualArray);
      }
      break;
      case VTK_ID_TYPE:
      {
        // FIXME: We should check that truncating to 32 bits is OK.
        array = vtkSmartPointer<vtkTypeInt32Array>::New();
#if VTK_ID_TYPE_IMPL == VTK_INT
        array->ShallowCopy(actualArray);
#else
        array->DeepCopy(actualArray);
#endif
      }
      break;
#if VTK_TYPE_UINT64 == VTK_UNSIGNED_LONG
      case VTK_LONG:
      {