Merge topic 'external_rendering_extensions'

5c56449f Provide extension manager support to external rendering module

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !134

Rendering/External/vtkExternalOpenGLRenderWindow.cxx

@@ -34,6 +34,12 @@ vtkExternalOpenGLRenderWindow::~vtkExternalOpenGLRenderWindow()
 //----------------------------------------------------------------------------
 void vtkExternalOpenGLRenderWindow::Start(void)
 {
+  // Make sure all important OpenGL options are set for VTK
+  this->OpenGLInit();
+
+  // Use hardware acceleration
+  this->SetIsDirect(1);
+
   if (this->AutomaticWindowPositionAndResize)
     {
     int info[4];
@@ -69,6 +75,12 @@ void vtkExternalOpenGLRenderWindow::Render()
   this->Superclass::Render();
 }
 
+//----------------------------------------------------------------------------
+bool vtkExternalOpenGLRenderWindow::IsCurrent(void)
+{
+  return true;
+}
+
 //----------------------------------------------------------------------------
 void vtkExternalOpenGLRenderWindow::PrintSelf(ostream& os, vtkIndent indent)
 {

Rendering/External/vtkExternalOpenGLRenderWindow.h

@@ -58,6 +58,11 @@ public:
   // before calling the superclass' Render() method
   void Render();
 
+  // Description:
+  // Tells if this window is the current graphics context for the calling
+  // thread.
+  virtual bool IsCurrent();
+
   // Description:
   // Turn on/off a flag which enables/disables automatic positioning and
   // resizing of the render window. By default, vtkExternalOpenGLRenderWindow