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New implementation of QVTKOpenGLWidget|QVTKOpenGLWindow class based on QOpenGLWindow

Mathieu Westphal (Kitware) requested to merge mwestphal/vtk:QVTKOpenGLWidget-stereo-support-mwestphal into master

Fixing stereo support with Qt5.

139f787a introduced QVTKOpenGLWidget to couple a vtkRenderWindow with a QOpenGLWidget. However, both QVTKOpenGLWidget and its superclass QOpenGLWidget manage a single frame buffer.

QVTKOpenGLWindow derives the QOpenGLWindow class to benefit from an OpenGL context managing multiple frame buffers. We define a QVTKOpenGLWidget2 that provides a direct wrapper around QVTKOpenGLWindow, to use it as a QWidget.

The old QVTKOpenGLWidget is been moved into QVTKOpenGLSimpleWidget and should not be removed as it support being a native widget, wich the new implementation does not.

Edited by Mathieu Westphal (Kitware)

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