Function PreDraw

Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:167–178

------------------------------------------------------------------------------ Call before glDraw* commands to ensure that vertices are properly captured for GL2PS export.

// Call before glDraw* commands to ensure that vertices are properly captured
// for GL2PS export.
void PreDraw(vtkOpenGLHelper& helper, int drawMode, size_t numVerts)
{
  vtkOpenGLGL2PSHelper* gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
  if (gl2ps && gl2ps->GetActiveState() == vtkOpenGLGL2PSHelper::Capture && helper.Program)
  {
    if (vtkTransformFeedback* tfc = helper.Program->GetTransformFeedback())
    {
      tfc->SetNumberOfVertices(drawMode, numVerts);
      tfc->BindBuffer();
    }
  }
}

//------------------------------------------------------------------------------
// Call after glDraw* commands to ensure that vertices are properly captured