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Marcus D. Hanwell authored
This required several classes to be copied over, they may not stay. It also required me to port many calls from vtkgl to GLEW, and get rid of checks for features in OpenGL 2.1 or less. The extension manager has been removed, and its functionality replaced. Change-Id: I60f8858a315a0e91c175aef6152ab57d26650cb4
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