Method UpdateMeshGeometryBuffers

Rendering/WebGPU/vtkWebGPUPolyDataMapper.cxx:1440–1723

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//------------------------------------------------------------------------------
void vtkWebGPUPolyDataMapper::UpdateMeshGeometryBuffers(vtkWebGPURenderWindow* wgpuRenderWindow)
{
  vtkLogScopeFunction(TRACE);
  if ((this->CachedInput != nullptr) && (this->CurrentInput != nullptr) &&
    (this->CurrentInput != this->CachedInput))
  {
    // invalidate any existing pipeline/bindgroups because input mesh changed.
    this->ReleaseGraphicsResources(wgpuRenderWindow);
  }
  if (this->CachedInput == nullptr)
  {
    vtkDebugMacro(<< "No cached input.");
    this->InvokeEvent(vtkCommand::StartEvent, nullptr);
    if (!this->Static)
    {
      this->GetInputAlgorithm()->Update();
    }
    this->CachedInput = this->CurrentInput = this->GetInput();
    this->InvokeEvent(vtkCommand::EndEvent, nullptr);
  }
  else
  {
    this->CurrentInput = this->CachedInput;
  }
  if (this->CurrentInput == nullptr)
  {
    vtkErrorMacro(<< "No input!");
    // invalidate any existing pipeline/bindgroups because input mesh changed.
    this->ReleaseGraphicsResources(wgpuRenderWindow);
    return;
  }

  // if there are no points then we are done
  if (!this->CurrentInput->GetPoints())
  {
    // invalidate any existing pipeline/bindgroups because input mesh changed.
    this->ReleaseGraphicsResources(wgpuRenderWindow);
    return;
  }

  // For vertex coloring, this sets this->Colors as side effect.
  // For texture map coloring, this sets ColorCoordinates
  // and ColorTextureMap as a side effect.
  int cellFlag = 0;
  this->MapScalars(this->CurrentInput, 1.0, cellFlag);
  if (this->ColorTextureMap)
  {
    if (this->ColorTextureHostResource == nullptr)
    {
      this->ColorTextureHostResource = vtk::TakeSmartPointer(vtkWebGPUTexture::New());
      this->ColorTextureHostResource->RepeatOff();
    }
    this->ColorTextureHostResource->SetInputData(this->ColorTextureMap);
  }
  else
  {
    this->ColorTextureHostResource = nullptr;
  }