Method Load

Rendering/OpenGL2/vtkOpenGLTexture.cxx:118–404

------------------------------------------------------------------------------ Implement base class method.

//------------------------------------------------------------------------------
// Implement base class method.
void vtkOpenGLTexture::Load(vtkRenderer* ren)
{
  vtkOpenGLRenderWindow* renWin = static_cast<vtkOpenGLRenderWindow*>(ren->GetRenderWindow());
  vtkOpenGLState* ostate = renWin->GetState();

  if (!this->ExternalTextureObject)
  {
    if (this->GetInputDataObject(0, 0) == nullptr)
    {
      return;
    }
    vtkImageData* input = this->GetInput();
    int numIns = 1;
    vtkMTimeType inputTime = input->GetMTime();

    if (this->CubeMap)
    {
      for (int i = 1; i < this->GetNumberOfInputPorts(); ++i)
      {
        vtkImageData* in = vtkImageData::SafeDownCast(this->GetInputDataObject(i, 0));
        if (!in)
        {
          break;
        }
        inputTime = std::max(inputTime, in->GetMTime());
        numIns++;
      }

      if (numIns < 6)
      {
        vtkErrorMacro("Cube Maps require 6 inputs");
        return;
      }
    }

    if (this->RenderWindow == nullptr && this->LoadTime.GetMTime() > this->GetMTime())
    {
      vtkErrorMacro("A render window was deleted without releasing graphics resources");
    }

    // Need to reload the texture.
    // There used to be a check on the render window's mtime, but
    // this is too broad of a check (e.g. it would cause all textures
    // to load when only the desired update rate changed).
    // If a better check is required, check something more specific,
    // like the graphics context.

    // has something changed so that we need to rebuild the texture?
    if (this->GetMTime() > this->LoadTime.GetMTime() || inputTime > this->LoadTime.GetMTime() ||
      (this->GetLookupTable() && this->GetLookupTable()->GetMTime() > this->LoadTime.GetMTime()) ||
      (this->RenderWindow == nullptr ||
        renWin->GetGenericContext() != this->RenderWindow->GetGenericContext()) ||
      renWin->GetContextCreationTime() > this->LoadTime)
    {
      int size[3];
      int xsize, ysize;

      this->RenderWindow = renWin;