[vtk-developers] Handling System that lack OpenGL 3.2 (on windows)

[Ken Martin]

With some help (thanks!) I have added some support for dynamically testing
for OpenGL 3.2 support and then selecting Mesa software rendering when
needed.  It is part of this commit

https://gitlab.kitware.com/vtk/vtk/commit/29607014a2dea0931ff30c0b584b25f760233245

The basic approach is as follows

 1) Build VTK with the advanced cmake option VTK_USE_OPENGL_DELAYED_LOAD
     turned on.

  2) Include vtkTestOpenGLVersion.h in your application and call
HandleOpenGL32Issues
     before you do any rendering or anything that would cause opengl
     to be used. Ideally do this right at the beginning of your program.

  3) Make sure you include vtkTestOpenGLVersion.exe with your application
     and pass the fullpath to it as the first argument to
HandleOpenGL32Issues

  4) Make sure you include the Mesa libraries with your application.
Typically
     this means opengl32.dll swrAVX.dll swrAVX2.dll and graw.dll. Pass the
path
     to these libraries as the second argument to HandleOpenGL32Issues


Hope this proves useful for those that need to support remote desktop or
older computers etc.

Thanks!
Ken

-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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