Method Render

Rendering/OpenGL2/vtkFramebufferPass.cxx:65–181

------------------------------------------------------------------------------ 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 vtkFramebufferPass::Render(const vtkRenderState* s)
{
  assert("pre: s_exists" && s != nullptr);

  vtkOpenGLClearErrorMacro();

  this->NumberOfRenderedProps = 0;

  vtkRenderer* r = s->GetRenderer();
  vtkOpenGLRenderWindow* renWin = static_cast<vtkOpenGLRenderWindow*>(r->GetRenderWindow());
  vtkOpenGLState* ostate = renWin->GetState();

  if (this->DelegatePass == nullptr)
  {
    vtkWarningMacro(<< " no delegate.");
    return;
  }

  // 1. Create a new render state with an FO.
  if (s->GetFrameBuffer() == nullptr)
  {
    // get the viewport dimensions
    r->GetTiledSizeAndOrigin(
      &this->ViewportWidth, &this->ViewportHeight, &this->ViewportX, &this->ViewportY);
  }
  else
  {
    int size[2];
    s->GetWindowSize(size);
    this->ViewportWidth = size[0];
    this->ViewportHeight = size[1];
    this->ViewportX = 0;
    this->ViewportY = 0;
  }

  this->ColorTexture->SetContext(renWin);
  if (!this->ColorTexture->GetHandle())
  {
    if (this->ColorFormat == vtkTextureObject::Float16)
    {
      this->ColorTexture->SetInternalFormat(GL_RGBA16F);
      this->ColorTexture->SetDataType(GL_FLOAT);
    }
    if (this->ColorFormat == vtkTextureObject::Float32)
    {
      this->ColorTexture->SetInternalFormat(GL_RGBA32F);
      this->ColorTexture->SetDataType(GL_FLOAT);
    }
    this->ColorTexture->Create2D(
      this->ViewportWidth, this->ViewportHeight, 4, VTK_UNSIGNED_CHAR, false);
  }
  this->ColorTexture->Resize(this->ViewportWidth, this->ViewportHeight);

  // Depth texture
  this->DepthTexture->SetContext(renWin);
  if (!this->DepthTexture->GetHandle())
  {
    this->DepthTexture->AllocateDepth(this->ViewportWidth, this->ViewportHeight, this->DepthFormat);