Merge topic 'change_osx_supports_opengl'

fad05318 make OSX use the generic superclass SupportsOpenGL
Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Berk Geveci <berk.geveci@kitware.com>
Merge-request: !1280

Rendering/OpenGL2/vtkCocoaRenderWindow.h

@@ -188,10 +188,6 @@ public:
   // Get report of capabilities for the render window
   const char *ReportCapabilities();
 
-  // Description:
-  // Does this render window support OpenGL? 0-false, 1-true
-  int SupportsOpenGL();
-
   // Description:
   // Is this render window using hardware acceleration? 0-false, 1-true
   int IsDirect();

Rendering/OpenGL2/vtkCocoaRenderWindow.mm

@@ -467,30 +467,6 @@ const char* vtkCocoaRenderWindow::ReportCapabilities()
   return this->Capabilities;
 }
 
-//----------------------------------------------------------------------------
-int vtkCocoaRenderWindow::SupportsOpenGL()
-{
-#ifdef GLEW_OK
-  this->CreateGLContext();
-  this->MakeCurrent();
-
-  GLenum result = glewInit();
-  bool m_valid = (result == GLEW_OK);
-  if (!m_valid)
-    {
-    return 0;
-    }
-
-  if (GLEW_VERSION_3_2 || (GLEW_VERSION_2_1 && GLEW_EXT_gpu_shader4))
-    {
-    return 1;
-    }
-
-#endif
-
-  return 0;
-}
-
 //----------------------------------------------------------------------------
 int vtkCocoaRenderWindow::IsDirect()
 {