Method CreateOffScreenWindow

Rendering/OpenGL2/vtkOSOpenGLRenderWindow.cxx:271–320

}

void vtkOSOpenGLRenderWindow::CreateOffScreenWindow(int width, int height)
{
  if (!this->Internal->OSMesaCreateContext || !this->Internal->OSMesaCreateContextAttribs)
  {
    return;
  }
  this->DoubleBuffer = 0;

  if (!this->Internal->OffScreenWindow)
  {
    this->Internal->OffScreenWindow = vtkOSMesaCreateWindow(width, height);
    this->OwnWindow = 1;
  }
#if (OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 1102) &&                                 \
  defined(OSMESA_CONTEXT_MAJOR_VERSION)
  if (!this->Internal->OffScreenContextId)
  {
    static const int attribs[] = { OSMESA_FORMAT, OSMESA_RGBA, OSMESA_DEPTH_BITS, 32,
      OSMESA_STENCIL_BITS, 0, OSMESA_ACCUM_BITS, 0, OSMESA_PROFILE, OSMESA_CORE_PROFILE,
      OSMESA_CONTEXT_MAJOR_VERSION, 3, OSMESA_CONTEXT_MINOR_VERSION, 2, 0 };

    if (this->Internal->OSMesaCreateContextAttribs != nullptr)
    {
      this->Internal->OffScreenContextId =
        this->Internal->OSMesaCreateContextAttribs(attribs, nullptr);
    }
  }
#endif
  // if we still have no context fall back to the generic signature
  if (!this->Internal->OffScreenContextId)
  {
    this->Internal->OffScreenContextId = this->Internal->OSMesaCreateContext(GL_RGBA, nullptr);
  }

  this->Mapped = 0;
  this->Size[0] = width;
  this->Size[1] = height;

  this->MakeCurrent();

  // tell our renderers about us
  vtkRenderer* ren;
  for (this->Renderers->InitTraversal(); (ren = this->Renderers->GetNextItem());)
  {
    ren->SetRenderWindow(nullptr);
    ren->SetRenderWindow(this);
  }

  this->OpenGLInit();
}

void vtkOSOpenGLRenderWindow::DestroyOffScreenWindow()
{