Method Render

Rendering/Parallel/vtkCompositeRGBAPass.cxx:120–502

------------------------------------------------------------------------------ Description: Perform rendering according to a render state \p s. \pre s_exists: s!=0

// Perform rendering according to a render state \p s.
// \pre s_exists: s!=0
void vtkCompositeRGBAPass::Render(const vtkRenderState* s)
{
  assert("pre: s_exists" && s != nullptr);

  if (this->Controller == nullptr)
  {
    vtkErrorMacro(<< " no controller.");
    return;
  }

  int numProcs = this->Controller->GetNumberOfProcesses();

  if (numProcs == 1)
  {
    return; // nothing to do.
  }

  if (this->Kdtree == nullptr)
  {
    vtkErrorMacro(<< " no Kdtree.");
    return;
  }

  int me = this->Controller->GetLocalProcessId();

  constexpr int VTK_COMPOSITE_RGBA_PASS_MESSAGE_GATHER = 201;

  vtkOpenGLRenderer* r = static_cast<vtkOpenGLRenderer*>(s->GetRenderer());

  vtkOpenGLRenderWindow* context = static_cast<vtkOpenGLRenderWindow*>(r->GetRenderWindow());
  vtkOpenGLState* ostate = context->GetState();

  if (!this->IsSupported(context))
  {
    vtkErrorMacro(<< "Missing required OpenGL extensions. "
                  << "Cannot perform rgba-compositing.");
    return;
  }

  int w = 0;
  int h = 0;

  vtkFrameBufferObjectBase* fbo = s->GetFrameBuffer();
  if (fbo == nullptr)
  {
    r->GetTiledSize(&w, &h);
  }
  else
  {
    int size[2];
    fbo->GetLastSize(size);
    w = size[0];
    h = size[1];
  }

  int numComps = 4;
  unsigned int numTups = w * h;